JPS6120060B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is suitable for a logic-oriented tape recorder, and relates to an improvement of its drive mechanism.

In recent years, there has been a trend toward logic in tape recorders, and development in this direction has been actively carried out. This logic tape recorder has a touch switch structure with multiple operators that put the tape recorder into a predetermined operating state or stop state, and uses an LSI dedicated to controlling the tape recorder, and an electromechanical converter such as a solenoid plunger. The various movable members of the tape recorder mechanism are controlled to move to positions where they are activated or stopped in accordance with the operated operator. According to such a logic-based tape recorder, since the operator can be made into a touch switch structure, it is possible to naturally realize soft touch operation of the tape recorder operator, and a solenoid plunger corresponding to the operation of the operator can be realized. The control means for driving the tape recorder requires only one dedicated LSI, and compared to conventional fully mechanical tape recorders, it has the advantage of being simpler, smaller, lighter, and cheaper to manufacture.

By the way, the logic-oriented tape recorder mentioned above is still in the development stage.
For example, there is a strong demand for detailed development in order to fully meet the needs of users in various aspects such as operation, construction, maintenance, and power consumption of solenoid plungers and the like.

The present invention has been made based on the above-mentioned circumstances, and it is an object of the present invention to provide an extremely good tape recorder drive mechanism that has a simple configuration, consumes little power, and is especially suitable for small portable tape recorders.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. That is, Figures 1 and 2
The figures are a front view and a back view showing the overall structure of a cassette tape recorder to which the present invention is applied. First, in FIG. 1, a main chassis 11 is made of a metallic material and is formed into a substantially rectangular shape.
A pair of reel stands 12 and 13 are rotatably supported approximately at the center of the main chassis 11. And this pair of reel stands 12,1
Gears 14 and 15, each having a large diameter, are coaxially and integrally provided on 3.

Also, on the substantially perpendicular bisector of the straight line connecting the rotation axes of the reel stands 12 and 13, and at the upper part of FIG. 1, there is a motor 16 for running the tape (see FIG. 2).
is provided. Rotating shaft 16 of this motor 16
1 protrudes from the surface side of the main chassis 11 and is fitted into the rotational center of the gear 17. On the surface side of the main chassis 11, a first
A friction member 18 having a protrusion 181 is provided at the bottom in the figure. This friction member 18 is connected to the gear 17
The gears 17 are interlocked with each other with a moderate frictional force, and depending on the direction of rotation of the gear 17, arrows A,
It is biased in direction B. A rotating shaft 182 is mounted on the protrusion 181 of the friction member 18, and the rotating shaft 182 rotatably supports a gear 19 that is constantly meshed with the gear 17.

Here, when the gear 17 is rotated counterclockwise in the figure by the motor 16, the friction member 18 is rotated by the arrow B
The gear 19 meshes with the gear 15,
The reel stand 13 is rotated counterclockwise in the figure. Further, when the gear 17 is rotated clockwise in the figure, the gear 19 similarly meshes with the gear 14, and the reel stand 12
is rotated clockwise in the figure, allowing the tape (not shown here) to run in forward and reverse directions.
Further, the motor 16 is designed so that the rotational speed and direction of rotation can be changed according to the operation of a tape constant speed running operating member (recording, playback) and a tape high speed running operating member (fast forward, rewinding), not shown. It is controlled by an electronic governor circuit or the like. The tape constant-speed and high-speed running operating members and the tape constant-speed running operating member (including pause), which are not shown, both have a touch switch structure, and when these are operated,
The electronic governor circuit is controlled by an LSI (not shown) dedicated to tape recorder control, and the motor 16 can be rotated or stopped in accordance with the operation.

Next, at the lower central portion of the main chassis 11 in FIG.
are arranged so as to be slidable in the directions of arrows C and D in the figure. This head chassis 20 has one L-shaped end 201 facing toward the gear 19, and the other end 201 facing toward the gear 19.
2 are installed in parallel on the main chassis 11 with the two facing leftward in the figure. One end portion 201 of the head chassis 20 has its tip cut into two pieces, and one portion 203 of the end portion 201 is inserted into the slide portion 111 formed by outsert-forming a synthetic resin material on the main chassis 11. It is supported so as to be slidable in the directions of arrows C and D in the figure.

Further, a head mounting body (indicated by a group of minute dots in the figure) 21 formed by molding a synthetic resin material is attached to the head chassis 20 from its corner to the other end 202. An erasing head 22 is attached to the left side of the head mount 21 in the figure, and a recording/reproducing head 23 is attached to the right side of the head mount 21 in the figure. Further, the head mounting body 21 includes wire bundle portions 211 and 2 for bundling lead wires (not shown) extending from the erasing head 22 and the recording/playback head 23.
12,213 are formed.

Here, a long substantially rectangular recess 214 is formed along the direction of the one end 201 in a portion of the head mounting body 21 corresponding to the recording/playback head 23.
A sphere 215 is loosely fitted into the recess 214 . Furthermore, a slide portion 112 having substantially the same shape as the slide portion 111 is formed by outsert in a portion of the main chassis 11 corresponding to the corner portion of the head chassis 20. Then, both ends of the substantially rectangular leaf spring 24 are attached to the slide portion 11.
The head chassis 20 is supported by the main chassis 11 by inserting the leaf springs 24 into the main chassis 11 and supporting the leaf springs 24 in an opposite direction so that the middle portion of the plate springs 24 is raised slightly by the spheres 215.

Further, between the head chassis 20 and the main chassis 11, a head slider 25 is arranged in parallel so as to be slidable in the directions of arrows C and D in the figure.
The head sliders 25 are arranged in parallel from one end 201 to a corner of the head chassis 20, and one end 251 of the head slider 25 is inserted into and supported by the slide portion 112. Further, the other end portion 252 of the head slider 25 is formed by being bent substantially perpendicularly from the surface of the head slider 25, and is a bent engagement piece that is inserted through a through hole 113 formed in the main chassis 11 and projects to the back surface side. The head slider 25 is slidably supported by the main chassis 11 by making the width of the head slider 253 (see FIG. 2) wider than the width of the through hole 113 after passing through the through hole 113. .

The head slider 25 has a spring 26 engaged between a bent locking piece 254 formed on one side thereof and an engaging piece 114 formed as an outsert on the main chassis 11. It is biased in the direction of arrow D in the figure. Further, the spring 2 is provided between the bent locking piece 255 formed at the other end of the head slider 25 and the through hole 204 formed at the inner corner of the head chassis 20.
7 is engaged, the head chassis 20
is interlocked with the head slider 25. Further, a bent locking piece 256 formed on the other side of the head slider 25 is inserted into the through hole 204 of the head chassis 20. Therefore, when the head slider 25 is now slid by an external force in the direction of arrow C against the biasing force of the spring 26, the head chassis 20 is also pulled by the spring 27 and moved in the same direction. Furthermore, when the external force is removed in this state, the head slider 25 is slid in the direction of arrow D by the spring 26, and at this time, the bent locking piece 256 of the head slider 25 is attached to the edge of the through hole 204 of the head chassis 20. Since they are engaged, the head chassis 20 is also slid in the direction of arrow D.

A pinch roller 28 is provided on the main chassis 11 on the right side of the head chassis 20 in the figure. This pinch roller 28 has a pinch lever 29 whose side surface is bent into a substantially U-shape.
The pinch lever 29 is rotatably supported at one end, and the other end of the pinch lever 29 is connected to the main chassis 11.
It is rotatably supported by a rotation shaft 115 implanted in the. Further, the head mounting body 21 extends to the pinch roller 28 side, and two locking portions 216 and 217 are protruded from the extended portion. The pinch lever 29 is connected to the locking portion 2.
The pinch lever 29 is biased clockwise in the figure by a torsion spring 30, which has one end secured to the pinch lever 29, is wound around the rotating shaft 115, and has the other end engaged with the rear side of the pinch lever 29. The pinch lever 29 is rotated until the locking piece 291 formed at one end of the pinch lever 29 comes into contact with the locking piece 217. When the head chassis 20 is slid in the direction of the arrow C as described above, the pinch lever 29 is also rotated clockwise in the figure by the biasing force of the torsion spring 30, and the pinch roller 29 is attached to the capstan 31. 28 is pressed. This capstan 31 is the second
This serves as the rotation axis of the flywheel 32 shown in the figure, and is inserted through the main chassis 11 from the back side to the front side so as to be rotatable without wobbling.

Further, on the left side of the head chassis 20 of the main chassis 11 in the figure, an eject member 33 is supported so as to be slidable in the directions of arrows E and F in the figure. This eject member 33 is the main chassis 1
1, it is formed into a substantially rod-like shape extending from the upper end to the lower end in the figure. The ejection member 33 has a substantially T-shaped through hole 331 formed at one end thereof, and a slide portion 1 which is outsertly formed in the main chassis 11 and projects in a substantially T-shaped side surface.
16, and the main chassis 1 is fitted into the through hole 332 of the illustrated shape formed at the other end.
The shaft 117 formed as an outsert on the shaft 117 is held down by a loosely inserted rear retaining ring 118, thereby being slidably supported. In addition, the eject member 33 has a spring 34 engaged between a bent locking piece 333 formed approximately in the center thereof and an engagement shaft 119 formed as an outsert in the main chassis 11. It is biased in the direction of arrow F.

Here, a lock portion 334 is formed at one end of the eject member 33 and protrudes substantially perpendicularly to the surface of the main chassis 11. When the cassette lid (not shown), which is normally biased in the open direction, is closed, a portion of the cassette lid is locked by the locking portion 334, and the cassette lid is maintained in the closed state. Here, as mentioned earlier, the plurality of controls for turning this cassette tape recorder into predetermined operating states and stopping states have a touch switch structure, but they can be used to open the cassette lid from the closed state. The eject operator (not shown) has a mechanical structure such as a push type or a piano touch type. When the eject operator is operated, the eject member 33 is slid in the direction of arrow E against the biasing force of the spring 34 in direct or indirect association with this operation. Then, the lock portion 334 of the eject member 33 separates from the cassette lid, and the cassette lid is opened.

Further, on the main chassis 11, an erroneous erasure prevention switch 35 and a cassette detection switch 36, which will be described in detail later, are provided near one end of the eject member 33.

Next, the structure of the back side of the main chassis 11 will be explained with reference to FIG. First, a braking member 37 having a symmetrical shape in the figure is supported on the back side of the main chassis 11 at a portion where the pair of reel stands 12 and 13 are supported so as to be slidable in the directions of arrows G and H in the figure. There is. This braking member 37
are engagement pieces 371, 37 formed at both ends thereof.
2 is a long hole 37 formed in the main chassis 11
3, 374 and engages with the sides of the elongated holes 373, 374 on the surface side of the main chassis 11, and its center part is sandwiched between the motor 16 and the main chassis 11, so that it can freely slide. It is supported by The braking member 37 has a long hole 37 formed approximately in the center thereof.
The center portion is wound around a shaft 376 formed as an outsert on the main chassis 11 and is loosely fitted into the brake member 5, and both ends are engaged with engagement pieces 377 and 378 formed on both sides of the braking member 37. Normally, it is biased in the direction of arrow H by a torsion spring 38.

Here, the movement of the braking member 37 due to the urging force in the direction of the arrow H is caused by brake elements 391 and 392 provided at both ends of the braking member 37 and extending through the elongated holes 373 and 374 and protruding toward the surface side of the main chassis 11.
However, the braked rings 121 and 131 are coaxially formed integrally with the reel stands 12 and 13 (see FIG. 1).
until it comes into contact with the Therefore, in the normal state, both reels 12 and 13 are braked so that they do not rotate. Further, approximately at the center of the braking member 37, there is a
A protrusion 379 extending downward in FIG. 2 is formed. The tip of this protrusion 379 faces the bent engagement piece 253 of the head slider 25.

Next, a small-diameter gear 40 is formed coaxially and integrally with the flywheel 32 . The flywheel 32 is connected to a motor 41, which is separate from the motor 16, via a belt 42 so as to be able to transmit rotational force, and is rotated at a constant speed clockwise in the figure around the capstan 31. and,
A large-diameter gear 43 that can mesh with the gear 40 is rotatably supported on the right side of the gear 40 of the main chassis 11 in the drawing. This gear 43 has two notches 4 at predetermined positions that do not mesh with the gear 40.
31,432 are formed. In addition, the gear 4
On one side facing the main chassis 11 of No. 3,
A cam portion 434 is formed which has a flat portion 433 in one portion and is curved in the shape shown in the drawing in the other portion. The cam portion 434 and the head slider 25
One end of the drive lever 44 is interposed between the bent engagement piece 253 and the bent engagement piece 253, as shown in FIG.
This drive lever 44 has a screw 441 in its middle part.
It is rotatably supported by the main chassis 11 by. The drive lever 44 has a spring 444 engaged between a through hole 442 formed on one side thereof and an engagement piece 443 formed as an outsert on the main chassis 11. It is biased counterclockwise. The other end of the drive lever 44 is connected to the leaf switch 4.
5 can be engaged. This leaf switch 45, when turned on, generates a control signal to, for example, the above-mentioned tape recorder control dedicated LSI so as to bring the motor 16 into a rotating state corresponding to tape constant speed running.

On the other hand, a substantially ring-shaped guide groove 435 is formed on the other surface of the gear 43. Two locking portions 436, 437 are formed at predetermined positions on the inner peripheral wall of the guide groove 435, and two step portions 438, 439 are formed on the outer peripheral wall at positions substantially opposite to the locking portions 436, 437. It is formed. A substantially L-shaped locking member 46 having a locking portion 461 formed at one end thereof is loosely fitted into the guide groove 435.
The corner portion thereof is rotatably supported by a rotation shaft 462 formed as an outsert in the main chassis 11. The other end of the locking member 46 has a substantially arc-shaped through hole 463 formed in the main chassis 11.
A pin 464 is formed that extends through the main chassis 11 and projects toward the surface side of the main chassis 11. The lock member 46 has a pin 46 protruding from the other end.
5, one end is wound around the rotation shaft 462, and the other end is engaged with an engaging portion 466 formed as an outsert in the main chassis 11. It is biased counterclockwise.

Here, as shown in FIG. 2, when the lock portion 461 of the lock member 46 is engaged with the locking portion 436 of the guide groove 435, one end portion of the drive lever 44 is connected to the cam portion 434. Flat part 43
3, and a spring 44 is attached to the drive lever 44.
As a result, the gear 43 is biased counterclockwise in the figure by the biasing force applied by the gear 43, but since the lock portion 461 is engaged with the locking portion 436, the gear 43 is biased counterclockwise in the figure. Rotation is prevented.

As shown in FIG. 3, one end of a lock release lever bar 47 is rotatably connected to one end of the lock member 46. As shown in FIG. This lock release lever 47 is located at the center of the main chassis 1.
It is rotatably supported by a rotation shaft 471 formed as an outsert in 1. The other end of the lock release lever 47 is connected to a drive piece 481 of the solenoid plunger 48.

Here, on the left side of the gear 40 of the flywheel 32 in the main chassis 11 in FIG. 2, a gear 49 that can mesh with the gear 40 is rotatably supported. This gear 49 has a notch 491 formed at a predetermined position that does not mesh with the gear 40. Further, on one side of the gear 49 facing the main chassis 11, a flat portion 4 is partially provided.
A cam portion 493 having a cam portion 92 and the other portion thereof being curved in the illustrated shape is formed. Then, the cam portion 4
One end of the drive lever 50 is located near the drive lever 93, as shown in FIG. The drive lever 50 is rotatably supported by the main chassis 11 at its intermediate portion by a screw 501. The drive lever 50 is configured such that a spring 504 is engaged between a through hole 502 formed at the other end and an engagement piece 503 formed as an outsert on the main chassis 11. Forced clockwise. In addition, the drive lever 5
The other end of the leaf switch 51 can be engaged with a leaf switch 51. When the leaf switch 51 is turned on, it generates a control signal to the tape recorder control LSI so as to cause the motor 16 to rotate in a state corresponding to high-speed tape running.

Here, as shown in FIG. 4, a head return lever 52 is attached to the drive lever 50 so as to overlap with it. This head return lever 52 is
It rotates around a screw 501 coaxially with the drive lever 50, one end of which extends beyond the drive lever 50, and the extending tip of which is connected to the main chassis 11.
A bent engagement piece 522 (first
(see Figures 1 and 2). As shown in FIG. 1 again, the bent engagement piece 522 faces the locking piece 205 formed protruding from the side of the head chassis 20.

Further, at the other end of the drive lever 50, a second
As shown in the figure, a pin 505 is provided to protrude.
One end engages with this pin 505, the other end engages with the bottom center of the braking member 37 (see FIG. 4), and the main chassis 11 is approximately at the center thereof.
A brake release lever 53 is provided which is rotatably supported by a rotation shaft 531 formed as an outsert.

On the other hand, the other surface of the gear 49 is formed with a substantially circular cam portion 496 in which two locking portions 494 and 495 are formed at predetermined positions. Further, two guide walls 49 having the shape shown in the figure are provided on the other surface of the gear 49 at positions substantially opposite to the locking portions 494 and 495.
7,498 have been formed. A substantially L-shaped lock member 54 having a lock portion 541 formed at one end that can engage with the cam portion 496 is rotated by a rotation shaft 542 formed as an outsert in the main chassis 11 at the other end. Supported for free movement. This locking member 54 is connected to the drive piece 551 of the solenoid plunger 55 at its corner, and is located between a locking piece 543 formed at the corner and an engaging piece 544 formed as an outsert on the main chassis 11. A spring 545 is engaged, so that it is biased counterclockwise in FIG.

Here, as shown in FIG.
94, one end of the drive lever 50 is connected to the flat part 492 of the cam part 493.
, and a spring 504 is attached to the drive lever 50.
As a result, the gear 49 is biased counterclockwise in the figure due to the biasing force applied by the gear 49, but since the lock portion 541 is engaged with the locking portion 494, the rotation of the gear 49 is prevented. is being prevented.

In the cassette tape recorder constructed as described above, the operation when the tape is running at a constant speed will first be described. Now, assuming that the cassette tape recorder is in a stopped state, the notch 431 of the gear 43 is in a position facing the gear 40, as shown in FIG. Although the gear 43 is biased counterclockwise in FIG. 5 by the lever 44, the locking portion 436 is engaged with the locking portion 461 of the locking member 46, so that the gear 43 is prevented from rotating. When a power switch (not shown) of the cassette tape recorder is turned on in this state, the motor 41 is energized and driven to rotate. Therefore, the flywheel 32 and gear 40 are
Although it is rotated clockwise in FIG. 5, it is not yet engaged with the gear 43.

In this state, it is assumed that, for example, a playback operation member (not shown) (touch switch structure) is operated as an operation member for running the tape at a constant speed. Then, the LSI determines that this playback operation member has been operated and performs the corresponding operation.
The LSI outputs a drive signal to the solenoid plunger 48, and also outputs a control signal for switching a tape recorder circuit section (not shown) to a reproduction state. Then, the solenoid plunger 4
8 is driven, its driving piece 481 is retracted as shown in FIG. Therefore, the lock release lever 47 is rotated counterclockwise in the figure, and the lock member 46 connected to the lock release lever 47 is rotated counterclockwise in the figure.
is rotated clockwise in the figure against the biasing force of the torsion spring 467. Then, the lock portion 461 of the lock member 46 engages the locking portion 43 of the gear 43.
6, the gear 43 is rotated slightly counterclockwise in the figure by the urging force previously applied from the drive lever 44, and is now engaged with the gear 40.

Hereinafter, the gear 43 is replaced by the gear 40 as shown in FIG.
It is rotated counterclockwise in the figure by the rotational force of .
Therefore, one end of the drive lever 44 is pushed up by the curved portion of the cam portion 434, and the drive lever 44 is rotated clockwise in the figure against the biasing force of the spring 444. Then, drive lever 4
One end of the head slider 25 contacts the bent engagement piece 253 of the head slider 25, and moves the head slider 25 upward in the figure. Therefore, as described above, the head chassis 20, which is in an interlocking relationship with the head slider 25, is also slid upward in FIG.
At this time, the bent engagement piece 253 comes into contact with the protrusion 379 of the brake member 37 and pushes the brake member 37 upward in FIG. 2.

Here, the solenoid plunger 48 is energized and driven for the time required for the locking portion 461 of the locking member 46 to disengage from the locking portion 436 of the gear 43. After the solenoid plunger 48 disengages, the driving piece 481 is driven by an external force. It can be freely moved in and out of the solenoid plunger 48. Therefore, after the lock portion 461 is released from the locking portion 436, it is pressed against the inner circumferential wall of the guide groove 435 by the urging force applied to the lock member 46 by the torsion spring 467.

Therefore, as the rotation of the gear 43 progresses, as shown in FIG.
is locked by a locking portion 437 of the gear 43. At this time, the notch 432 of the gear 43 is in a position facing the gear 40, the gear 43 no longer meshes with the gear 40, and the rotation of the gear 43 is stopped. Also, at this time, one end of the drive lever 44 is connected to the cam portion 43.
4 is pushed up as far as possible in the figure, and one end of the drive lever 44 touches the curved part of the cam part 434 and the flat part 43 as shown in the figure.
3 and the biasing force of the spring 444 eventually biases the gear 43 in the counterclockwise direction in the figure.
Since the gear 43 is locked to, rotation of the gear 43 is prevented.

In this state, the head slider 25 and the braking member 37 are also pushed up as far as possible in the figure, the head chassis 20 is also slid as far upward as in FIG.
3 is brought into contact with a tape (not shown), and the pinch roller 28 is brought into contact with the capstan 3 via the tape.
1. At the same time, the brake elements 391 and 392 of the brake member 37 are completely separated from the braked rings 121 and 131 of the reel stands 12 and 13, and the reel stands 12 and 13 are no longer braked. Furthermore, at this time, the leaf switch 45 (see FIG. 2) is turned on by the other end of the drive lever 44, so the motor 16 is rotated at a rotation speed and rotation direction corresponding to the tape constant speed running state, and the reel is rotated. The platforms 12 and 13 are rotated, and stable tape playback is performed here.

Here, when a recording operation member (touch switch structure) (not shown) is operated as an operation member for constant tape running, the LSI outputs a drive signal to the solenoid plunger 48 and puts the tape recorder circuit into the recording state. outputs a control signal to switch to provide Then, the head chassis 20 is moved in the same manner as described above, and stable recording is performed.

It is also assumed that a stop operation member (not shown) (touch switch structure) is operated in the tape playback state as described above. Then, the LSI determines that the stop operation member has been operated while the tape is running at a constant speed, and
A drive signal is output to the solenoid plunger 48 again. . When this solenoid plunger 48 is driven, as shown in FIG.
is pulled in, and the lock portion 461 of the lock member 46
is released from the locking portion 437 of the gear 43. Then, the gear 43 is rotated counterclockwise in the figure by the urging force previously applied by the drive lever 44, and the locking part 43 is again attached to the locking part 461 as shown in FIG.
6 is locked, rotation of the gear 43 is prevented. At this time, the drive lever 44
Since it is rotated counterclockwise in the figure by the urging force of 4,
The head slider 25 is also moved backward by the urging force of the spring 26 (see FIG. 1), and the braking member 37 is also returned to its original position, and the head chassis 20 and pinch roller 28 are returned to their original positions, and the brake 391 and 392 are reel stands 12 and 13
The leaf switch 45 is brought into pressure contact with the braked rings 121, 131, and the rotation of the off-remotor motor 16 and the reel stands 12, 13 is stopped, and the cassette tape recorder returns to its original stopped state.

Here, in the tape playback state shown in FIG. 8, when the lock portion 461 is released from the locking portion 437, the notch 431 of the gear 43 as shown in FIG.
The gear portion formed between and 432 is the gear 40
The rotational penetration of the flywheel 32 suppresses the biasing force of the drive lever 44 of the gear 43 in the counterclockwise direction in the figure, so that the locking part 431 is prevented from being hit by the locking part 461. There is.

Furthermore, the same explanation as above can be given when the stop operation member is operated in the tape recording state.

Therefore, according to the mechanism for running the tape at a constant speed as described above, the cam portion 434 for sliding the head chassis 20 on one gear 43 is provided.
and two locking parts 436 and 437 for locking the gear 43 according to the position of the cam part 434, so that the position of the head chassis 20 can be changed when the tape is stopped and when the tape is running at a constant speed. Therefore, the structure can be made extremely compact, making it suitable for small portable cassette tape recorders and the like.
The solenoid plunger 48 also has a locking portion 461 of the locking member 46 attached to the locking portion 43 of the gear 43.
Since the power is supplied only for the time required to separate the device from the 6,437, power consumption is extremely low, making it particularly suitable for battery-powered tape recorders.

Further, in the state shown in FIG. 8, an external operation is performed to rotate the lock member 46 counterclockwise in the figure and forcibly disengage the lock portion 461 from the locking portion 437 of the gear 43. If a separate control element is provided, for example, when the solenoid plunger 48 is not driven even if the stop operation member is operated during a power outage or when the battery power is exhausted, the cassette tape recorder can be stopped from its original operation by external operation. It is possible to restore the condition.

Next, the operation in a tape running state at high speed will be explained. Now, assuming that the cassette tape recorder is in a stopped state, the notch 491 of the gear 49 is in a position facing the gear 40, as shown in FIG. 10, and in this position, as described above,
Although the gear 49 is urged counterclockwise in FIG. 10 by the drive lever 50, the locking portion 494 is locked to the locking portion 541 of the locking member 54, so that the gear 49 is prevented from rotating. . When the power switch is turned on in this state, the motor 41 is driven to rotate as described above, and the gear 40 is rotated to the tenth position.
Although it is rotated clockwise in the figure, it does not mesh with the gear 49.

In this state, it is assumed that, for example, a fast-forward operation member (not shown) (touch switch structure) is operated as an operation member for running the tape at a constant speed. Then, the LSI determines that this fast-forward operation member has been operated,
The LSI outputs a drive signal to the solenoid plunger 55. Then, the solenoid plunger 5
5 is driven, its driving piece 551 is retracted as shown in FIG. Therefore, the lock member 54 resists the biasing force of the spring 545,
It is rotated clockwise in the figure. Then, the lock portion 541 of the lock member 54 engages the locking portion 494 of the gear 49.
The gear 49 is rotated slightly counterclockwise in the figure by the biasing force previously applied from the drive lever 50, and is now engaged with the gear 40.

Hereinafter, the gear 49 is the gear 4 as shown in FIG.
It is rotated counterclockwise in the figure by a rotational force of 0. Therefore, one end of the drive lever 50 is pushed by the curved portion of the cam portion 493, and the drive lever 50 is rotated clockwise in the figure against the biasing force of the spring 504. Then, drive lever 5
0 pin 505 presses one end of the brake release lever 53, and the brake release lever 53 is rotated counterclockwise in the figure. Therefore, the other end of the brake release lever 53 comes into contact with the bottom center of the brake member 37, and the brake member 37 is moved to the torsion spring 3.
Push it upward in the figure against the urging force of 8.

Here, like the solenoid plunger 48, the solenoid plunger 55 is energized and driven for the time required for the locking portion 541 of the locking member 54 to disengage from the locking portion 494 of the cam portion 496. Thereafter, the drive piece 551 can be freely moved in and out of the solenoid plunger 48 by external force. Therefore, the lock part 5
After the lock member 41 is released from the locking portion 494, it is pressed against the peripheral wall of the cam portion 496 by the urging force applied to the lock member 54 by the spring 545.

Therefore, as the gear 49 continues to rotate, the lock portion 541 of the lock member 54 locks as shown in FIG.
is locked by the locking part 495 of the cam part 496.
At this time, the notch 491 of the gear 49 is in a position facing the gear 40, the gear 49 no longer meshes with the gear 40, and the rotation of the gear 49 is stopped. Further, at this time, the drive lever 50 is in the state of being rotated most clockwise in the figure, and the drive lever 50 is
0 comes into contact with the contact point between the curved part of the cam part 493 and the flat part 492 as shown, and the biasing force of the spring 504 eventually biases the gear 49 in the counterclockwise direction in the diagram. However, since the lock portion 541 is locked to the locking portion 495, rotation of the gear 49 is prevented.

In this state, the brake member 37 is pushed up the most upward in the figure, and the brake elements 391, 39
2 is the braked ring 121 of the reel stand 12, 13,
131, and no brake is applied to the reel stands 12, 13. Furthermore, at this time, the leaf switch 51 (see Figure 2) is turned on by the other end of the drive lever 50, and the LSI has previously determined that the fast-forward operation member has been operated. By this, the motor 16
is rotated at a speed and direction corresponding to the tape fast-forwarding state, the reel stands 12 and 13 are rotated, and stable tape fast-forwarding is performed.

Here, when a rewind operation member (not shown) (touch switch structure) is operated as an operation member for high-speed tape running, the LSI outputs a drive signal to the solenoid plunger 55. Then, when the leaf switch 51 is turned on in the same manner as above,
Since the LSI determines that the rewinding operation member has been operated, the motor 16 is rotated at a speed and direction corresponding to the tape rewinding state, and stable tape rewinding is performed.

Further, assume that the stop operation member is operated in the tape fast forwarding state as described above. Then, the above
The LSI determines that the stop operation member has been operated in the fast forward state and outputs a drive signal to the solenoid plunger 55 again. When the solenoid plunger 55 is driven, the driving piece 551 is retracted, and the locking portion 541 of the locking member 54 is disengaged from the locking portion 495 of the cam portion 496. Then,
The gear 49 is rotated counterclockwise in the figure by the biasing force applied by the drive lever 50, and the locking part 4 is again attached to the locking part 541 as shown in FIG.
With gear 94 locked, rotation of gear 49 is prevented. At this time, the drive lever 50 is
Since the brake release lever 53 is rotated counterclockwise in the figure by the biasing force 04, no force is applied to the brake release lever 53 in the clockwise direction in the figure, and the braking member 37 returns to its original position by the biasing force of the torsion spring 38. Then, the brakes are applied to the reel stands 12 and 13. At this time, the leaf switch 51 also stops the rotation of the off-frame motor 16, and the cassette tape recorder returns to its original stopped state.

Furthermore, the same explanation as above can be given when the stop operation member is operated in the tape rewinding state.

Next, the operation when a pause (for temporarily stopping tape running) operation member (touch switch structure), not shown, is operated will be described. That is, when the tape is running at a constant speed, as shown in FIG. 8, the head slider 25 is located at the uppermost position in the figure, and the head chassis 20 is located at the uppermost position in FIG. At this time, the engagement piece 205 formed on the side of the head chassis 20 is connected to the drive lever 50.
It is located near the lower part in FIG. 1 of the bent engagement piece 522 of the head return lever 52 attached to the head.

When the pose operation member is operated in such a state, the LSI determines that the pose operation member has been operated and outputs a drive signal to the solenoid plunger 55. Then, as mentioned above, gear 4
9 is in a position as shown in FIG. At this time, the drive lever 50 and the head return lever 52
are both at the most rotated position in the clockwise direction in FIG. Push it down slightly against the biasing force. Therefore, the erasing head 22 and the recording/reproducing head 23 are lowered to a position where they lightly touch the tape, and the pinch roller 28 is completely separated from the capstan 31. At this time,
At the same time, the rotation of the motor 16 is stopped because the leaf switch 51 is turned on by the other end of the drive lever 50 and the LSI determines that the pause operation member has been operated. Then, the pinch roller 28 separates from the capstan 31, the constant speed running of the tape is stopped, and a pause state is realized.

Here, the pause operation member has a so-called dual-operable touch switch structure in which it is turned on when it is touched once, remains on even if the hand is removed, and turned off when it is touched again. Then, when the pause operation member is operated again in the pause state as described above, a drive signal is output from the LSI to the solenoid plunger 55. Then, as mentioned above, the gear 49 returns to the position shown in FIG. 10, and the head return lever 52 is also returned to its original position, so the head chassis 20 is again moved upward in FIG. 1 and tape playback is resumed. It will be resumed.

Also, with the pose operation member operated in advance,
Even if the constant speed tape running operation member is operated later, the pause state can be realized. In this case, the head chassis 20 is first moved upward in FIG. 1 with the head return lever 52 in the position shown in FIG. This is the result.

Here, the operation when the fast forward or rewind operation member is operated in the tape playback state will be described. That is, let us assume that the fast-forward operating member is operated in the tape playback state previously explained with reference to FIG. Then, as mentioned earlier, solenoid plunger 5
5 is driven, the gear 49 is in the position shown in FIG. 13, and the head return lever 5 is moved as in the pause state.
2, the head chassis 20 is slightly retracted. At this time, it is determined that the leaf switch 51 is turned on by the other end of the drive lever 50 and that the fast forward operation member is operated in the playback state.
Based on the determination by the LSI, the motor 16 is controlled to have a rotational speed and rotation direction corresponding to the fast-forward state, and the tape is fast-forwarded. At this time, since the recording/reproducing head 23 is in light contact with the tape, the cassette tape recorder ends up in a fast forward playback (queue) state.

Furthermore, when the rewind operation member is operated in the tape playback state instead of the fast forward operation member, the operation is similar to that described above, and the motor 16 is controlled so as to have a rotational speed and rotation direction corresponding to the rewind state. The cassette tape recorder enters a rewind playback (review) state.

In the queue or review state as described above, the solenoid plunger 5 is activated by a detection signal from a non-illustrated inter-music unrecorded portion detection circuit, for example.
5, the cassette tape recorder returns to the playback state in the same manner as the pause state is canceled and the tape is run at a constant speed, thereby realizing automatic cueing. .
Further, in the state shown in FIG. 13, the solenoid plunger 55 is driven by an external operation, or the lock member 54 is rotated clockwise in the figure to disengage the lock portion 541 from the locking portion 495 of the cam portion 496. If such an electrical or mechanical operator (not shown) is separately provided, it is possible to perform so-called manual music selection by switching to the tape playback state at any position in the queue or review state.

Therefore, as described above, according to the mechanism for bringing the cassette tape recorder into the high-speed tape running state, the pause state, the queue and review states,
Similar to the mechanism for running the tape at a constant speed, cam portions 493 and 496 formed on one gear 49
In addition to regulating the positions of the braking member 37 and the head chassis 20, the rotation of the motor 16 is electrically controlled by an LSI so that various controls can be performed, making the configuration extremely compact and portable. It is suitable for small cassette tape recorders and the like. Further, the time required to energize the solenoid plunger 55 is only the time required to disengage the locking portion 541 of the locking member 54 from the locking portions 494, 495 of the cam portion 496, resulting in extremely low power consumption and a battery-powered tape recorder. It is suitable for

The configuration and basic operation of the cassette tape recorder described here have been described above, and the specific configuration and operation of each part will be explained below. First, FIG. 14 shows the state in which the solenoid plunger 48 and the lock release lever 47 are connected. That is, the drive piece 481 of the solenoid plunger 48 is formed in a substantially cylindrical shape, and a groove 48 is formed in a predetermined portion thereof along the outer periphery.
2 is formed. At the other end of the lock release lever 47, locking pieces 472 and 473 are formed to protrude and sandwich the groove 482 of the drive piece 481. In addition, the locking pieces 472, 47
A locking portion 474 that engages with the head portion 483 of the drive piece 481 is also formed between the three portions.

Here, when the solenoid plunger 48 is not energized, the head 483 of the drive piece 481
is engaged with the locking piece 472 at the point indicated by arrow _I1 in FIG. When the solenoid plunger 48 is energized in this state, the drive piece 48 first
The head 483 of No. 1 rotates the lock release lever 47 counterclockwise in the figure via the locking piece 472.
Then, when the drive piece 481 is further drawn in,
As shown in FIG. 15, the head 483 engages with the locking portion 474 as indicated by arrow I ₂ in the figure to rotate the lock release lever 47. Furthermore, the drive piece 48
1, as shown in FIG. 16, its head 483 engages with the locking portion 473 at the point indicated by arrow _I3 in the figure, and the lock release lever 47 moves counterclockwise in the figure. Rotate in the direction. In other words, the solenoid plunger 48 is energized, and the drive piece 481
In the process of being drawn in, the drive piece 48
The head 483 of the lock release lever 47 engages in this order with the locking piece 472, the engaging portion 474, and the locking piece 473 of the lock releasing lever 47.
7 in the counterclockwise direction in the figure moves toward the rotation axis 471 of the lock release lever 47 in the process of retracting the drive piece 481.

And the drive piece 4 of the solenoid plunger 48
81 and the lock release lever 47 as described above. First, in a constant speed running state as shown in FIG. , not only the biasing force of the spring 444 but also the biasing force of the spring 26 (see FIG. 1) which attempts to return the head slider 25 to its original retracted position, and the biasing force which returns the pinch lever 29 to its original position. Since the rotation urging force of the torsion spring 30 is applied, the locking portion 437 is pressed against the locking portion 461 of the locking member 46 with a fairly strong force. Therefore, in order to disengage the lock portion 461 from the locking portion 437, the suction force by which the solenoid plunger 48 pulls in the drive piece 481 must be
That means it has to be quite strong.

On the other hand, in a normal solenoid plunger,
The distance that the drive piece protrudes from the main body,
The relationship with the attraction force F at that distance is the 17th
As shown in the figure, it is known that the longer the protruding distance of the drive piece is, the weaker the suction force F becomes, and as the drive piece is retracted and the protrusion distance becomes shorter, the suction force F becomes stronger.

For this reason, first of all, when the protruding distance of the drive piece 481 is long as shown in FIG.
3 is engaged with the locking piece 472 located farthest from the rotation shaft 471 of the lock release lever 47, so that the lock release lever 47 can be rotated even with a weak suction force. As shown in FIGS. 15 and 16, as the driving piece 481 is sequentially drawn in and the suction force becomes stronger, the head 483 is moved closer to the rotation shaft 471 and the locking portion 474 is engaged. Piece 4
73 to increase the rotational stroke of the lock release lever 47 to ensure that the lock portion 461 of the lock member 46 is disengaged from the locking portions 436, 437 of the gear 43.

Further, the connection between the drive piece 551 of the other solenoid plunger 55 and the locking member 54 has substantially the same structure as described above.

Therefore, according to the means for connecting the drive piece 481 of the solenoid plunger 48 and the lock release lever 47 as described above, when the drive piece 481 is pulled in, the head 483 of the solenoid plunger 48 is moved to the locking piece 472 and the lock release lever 47. 474 and the locking piece 473, and the point of force that applies the force to rotate the lock release lever 47 is brought closer to the next rotation shaft 471 in sequence, so that the suction force of the solenoid plunger 48 is reduced. The lock portion 461 of the locking member 46 can be effectively used without waste, and the locking portion 461 of the locking member 46 can be sufficiently connected to the gear 43 without using the large solenoid plunger 48.
This is advantageous in terms of power consumption as well. In this regard, two solenoid plungers of the same performance, one connected to the lock release lever by conventional means and the other connected to the lock release lever as shown in FIG. 14, were energized. However, it has been found through experiments that in the former case, the lock part 461 could not be disengaged from the locking part 437, whereas in the latter case, the lock part 461 could be sufficiently disengaged.

Next, FIG. 18 shows the locking portion 43 of the gear 43.
6, 437 and the lock portion 461 of the lock member 46 are shown in a locked state. That is, gear 4
The opposing surfaces of the locking portion 437 and the locking portion 461 of No. 3 are formed to have an angle α _P as shown in the drawing. In addition, the locking portion 436 of the gear 43 and the locking portion 4
61 is formed to have an illustrated angle α _S larger than the angle α _P described above.

Therefore, when the solenoid plunger 48 is energized and driven while the locking portion 436 or 437 is locked in the locking portion 461, the locking portion 46
1 is the locking portion 436 or 4 of the above angles α _S and α _P
It comes to be separated along the slope of the 37th plane. In other words, the lock portion 461 can be released from the locking portions 436, 437 with a relatively small force. Therefore, in addition to moving the force point of the lock release lever 47 mentioned above, the load on the solenoid plunger 48 is lightened, so that a small solenoid plunger 48 can be used satisfactorily.

Here, the reason why the angle α _P between the facing surfaces of the locking portion 461 and the locking portion 437 is smaller than the angle α _S between the facing surfaces of the locking portion 461 and the locking portion 436 will be explained. That is, as mentioned above, in the constant speed tape running state as shown in FIG. spring 2
6 and the torsion spring 30, the locking portion 437 is attached to the locking portion 46.
1 with a fairly strong force, and if the angle α _P is too large, the lock portion 461 will undesirably come off from the locking portion 437. On the other hand, in the situation shown in Figure 5,
Since only the biasing force of the spring 444 is applied to the gear 43 via the drive lever 44, the locking portion 436 is pressed against the locking portion 461 with a not very strong force, and the angle α _S is slightly changed. Even if the size is increased, the lock portion 461 may undesirably close to the locking portion 43.
This is because there is no possibility of leaving from 6.

Here, a description will be given of the range of the angles α _P and α _S that can facilitate the release of the lock portion 461 and prevent undesired release. Figure 19 shows the gear 4 above.
3 shows the force relationship at the locking portion 437 of No. 3 as a vector. Now, T P is the rotational torque applied to the gear 43 when the lock part 461 is locked to the lock part 437, and T _P is the rotational torque applied to the gear 43 when the lock part 461 is locked to the lock part 436. Assuming that the rotating torque is also T _S , the relationship between the two torques T _P and T _S is T _P >> T _S as described above.

Here, as shown in FIG. 19, the force N' with which the locking portion 437 presses the locking portion 461 due to the rotational torque T _P is N'=T _P /r, where r: The radius will be as shown. Also, the component force f caused by the angle α _P due to the above force N′ is f=N′sinα _P , and the reaction force N of the resultant force of N′ and f is N=N′cosα _P. Become. Here, if the coefficient of friction is μ, then the frictional force L is L=μN, and the frictional force L′ due to the vector in the same direction as the component force f is L′= _{μNcosαP.Therefore} , the lock portion 461 is the locking portion. 437 is the balance when the locking force is F, then F+P+L'=f. However, P: Biasing force of the torsion spring 467 shown in Fig. 8 F∴=f-P-L'=N' sinα _P −P−μNcosα _P =T _P /rsinα _P −P−μT _P /r
cos ² α _P =T _P /r(sin α _P −μcos ² α _P )−P..., and by setting the angle α _P so that F>0, the lock part 461 can be easily disengaged and the problem can be avoided. Desired detachment can be prevented. Further, regarding the lock portion 461 and the locking portion 436, the angle α _S can be determined by substituting T _P in the above equation as T _S.

Here, FIG. 20 shows a modification of the one shown in FIG. 18. In the figure, angles α and α' have a relationship of α>α', and angle α' also includes a negative angle. Furthermore, the above angle α is such that α>α _P with respect to the angle α _P set by the above formula.

In addition, the locking portions 436 and 437 of the locking portion 461
In order to facilitate the detachment from the system, the arrangement shown in FIG. 21 may be adopted. That is, this is such that the depth of engagement of the locking portions 436 and 437 with respect to the locking portion 461 is changed. In other words, the relationship between the distances R _S and R _P in the figure is R _P >R _S . By doing this, the locking portion 4 of the locking portion 461 in the tape constant speed running state
37 is shallower than when the tape is stopped, so even if the suction stroke of the solenoid plunger 48 is small, the locking portion 4
61 can be easily disengaged from the locking portion 437, and as a result, the power consumption of the solenoid plunger 48 can be reduced.

Therefore, as described above, according to the mechanism for easily disengaging the lock portion 461 from the locking portions 436 and 437, for example, when molding the gear 43, the angles α _P and α _S and the distance R are simultaneously adjusted. Since _P , R _S, etc. can be formed, manufacturing is easy and great effects can be obtained.

Next, the solenoid plunger 48 is driven again from the state shown in FIG.
When the gear 43 is released from the locking portion 436 of the gear 40 and rotates while meshing with the gear 40 as shown in FIG. 7, the lock portion 461 traces the inside of the guide groove 435 of the gear 40. . At this time,
The lock portion 461 is pressed against the inner peripheral wall of the guide groove 435 by the biasing force of the spring 467, but in addition to this, the lock release lever 47 is also pressed by the outer peripheral wall of the guide groove 435 as shown in FIG. guided to a mid-horizontal position. The fact that the lock release lever 47 is in the horizontal position in FIG. 7 means that the driving piece 481 of the solenoid plunger 48, which was once energized and retracted, is pulled out to its original position.

Generally speaking, the driving piece of a solenoid plunger gradually becomes magnetized as it is used many times, and once it is pulled in, a small force (for example, a spring 4
It is known that with a biasing force of about 67 degrees), it will not return to its original position. In particular, the biasing force of the spring 467 is made weak in order to reduce the load on the solenoid plunger 48 during suction.

Therefore, the lock portion 461 is guided by the outer peripheral wall of the guide groove 435, and as a result, the drive piece 481 of the solenoid plunger 48 is pulled out to the original position via the lock release lever 47. . Further, this can be similarly explained when the state shown in FIG. 8 returns to the state shown in FIG. 5 via FIG. 9. Furthermore, this means that the gear 49 shown in FIGS.
The same applies to the lock section 541. At this time, the lock portion 541 is guided by the guide walls 497, 498, and the lock member 54 is rotated.
This pulls out the driving piece 551 of the solenoid plunger 55.

Therefore, according to the mechanism for pulling out the drive pieces 481, 551 of the solenoid plungers 48, 55 as described above, the lock parts 461, 541 that define the operating state of the cassette tape recorder are connected to the guide groove 435 and the cam part. 496, the outer peripheral wall and guide walls 497, 498
As a result, the driving pieces 481, 551 of the solenoid plungers 48, 55 are pulled out by being guided by the cassette tape recorder, so that the operation of the cassette tape recorder can be ensured with an extremely organic structure.

Next, FIGS. 22a and 22b show the eject member 3
This shows the details of 3. That is, as described above, the eject member 33 is slid in the direction of arrow E in the figure in conjunction with the operation of the eject operator, and at this time, the lock portion 334 is separated from the cassette lid, and the cassette lid is opened. It is a state. Here, the eject member 33 has a slide portion 116 formed as an outsert on the main chassis 11 fitted into its through hole 331, but this fitting is made with some margin. . For this reason, the eject member 33
is rotatable about the slide portion 116 in the directions of arrows J and K in the figure. The eject member 33 is normally urged in the direction of arrow K by the spring 34, but the rotation of the eject member 33 is caused by the shaft 117
32 until it comes into contact with the side wall of No. 32.

Furthermore, an engaging piece 335 having an inclination is formed on the lower side surface of the eject member 33 in the drawing. An engaging portion 218 that engages with the locking piece 335 of the eject member 33 is formed at the left end of the head mounting body 21 attached to the head chassis 20 in the drawing. Furthermore, a protrusion 336 is formed on the side of the through hole 332 of the eject member 33. Now, when the eject member 33 is in the state shown in FIG.
It is something that can be slid in the direction.

Here, when the tape constant speed running operation member is operated, the head chassis 20 is slid upward in the figure, as shown in FIG. 23. At this time, the engaging portion 218 of the head mounting body 21 engages with the protrusion 336 of the ejecting member 33, and the ejecting member 3
3 in the direction of arrow J. Then, the protrusion 336 of the eject member 33 is in a position facing the shaft 117, and in this state, even if the eject operator is not operated, the protrusion 336 comes into contact with the shaft 117, and the eject member 33 is not slid in the direction of arrow E. , This prevents the eject operator from being operated. Further, in the above-described pose, queue, and review states, even if the head chassis 20 is moved slightly backward, the eject member 33 remains in a position where its protrusion 336 is engaged with the shaft 117.

In short, the cassette lid cannot be opened during tape constant speed running, pause, queue, and review states.

To explain the reason for this, for example, when the tape is running at a constant speed, the tape moves to the erasing head 22.
and is in contact with the recording/reproducing head 23, and is also sandwiched between the capstan 31 and the pinch roller 28. If you accidentally operate the eject button under these conditions, the tape cassette will be moved to the eject position when the cassette lid opens, causing damage to the tape or cutting it. There's a problem. The tape can also be erased when pausing, cueing, or reviewing.
2 and the recording/reproducing head 23, the above-mentioned problem occurs.

Therefore, the above problem is solved by making it impossible to operate the eject operator in each state of tape constant speed running, pause, queue, and review.
The tape must be protected.

Therefore, according to the mechanism for preventing ejection as described above, the sliding portion 116 is loosely fitted into the through hole 331 of the ejecting member 33, and the ejecting member 33 is moved in the directions of arrows E and F in the figure. Since it is movable in the directions of arrows J and K, the ejection member 33 that locks the cassette lid in the closed state can be directly linked to the sliding movement of the head chassis 20 to prevent ejection. It is something that you can get action on. Regarding this point, in the past, a separate member that interlocked with the head chassis was used, and when the head chassis moved forward, this member moved into the moving path of the eject member to prevent ejection, resulting in an extremely complicated and large structure. The problem was that it was easy.

In addition, the eject member 33 rotates around the slide portion 116 that is fitted into the through hole 331 near the lock portion 334, and even if the eject member 33 rotates, the lock portion 334 does not move much, and the cassette lid is closed. It can be reliably locked.

Note that at one end of the eject member 33,
An engaging portion 337 is formed to engage with an erroneous erasure prevention switch 35 and a cassette detection switch 36, which will be described later. When the ejecting member 33 is slid in the direction of arrow E during ejecting, the engaging portion 337 engages with the accidental erasure prevention switch 35 and the cassette detection switch 36, and both switches 35, 3
6 from the tape cassette to open the cassette lid.

Next, FIG. 24 shows another example of tape protection measures when the eject operator is operated in each state of tape constant speed running, pause, queue, and review. That is, the lock release lever 47
A through hole 475 formed in the main chassis 11 is provided at the end to which the solenoid plunger 48 is connected.
and a through hole 332 formed in the eject member 33
A pin 476 is formed to be inserted through the. Also,
In the through hole 332 of the ejection member 33, a notch 338 is formed at the lower left end in the figure, and an engaging portion 339 that engages with the pin 476 is formed at the right end, and the protrusion 336 is eliminated. ing.

When the head chassis 20 is in the backward position, when the eject operator is operated, the eject member 33 is slid in the direction of the arrow E. At this time, the pin 476 is inserted through the notch 338, so that the eject member 33 and the pin 476 are is not engaged, and normal ejection is performed.

On the other hand, as shown in FIG. 24, when the head chassis 20 is in the forward position (tape constant speed running state), the eject member 33 is rotated in the direction of arrow J, so that the engaging portion 339 engages with the pin 475. match. When the eject operator is operated in this state, the eject member 33 slides in the direction of arrow E, the engaging portion 339 pushes the pin 475, the lock release lever 47 is rotated clockwise in the figure, and the lock is released. The member 46 is rotated counterclockwise in the figure. Therefore, since the tape is running at a constant speed first, the locking portion 461 of the locking member 46 is locked to the locking portion 437 of the gear 43, but it is released from the locking portion 437. Then, as described above, the head chassis 20 is moved backward, and the tape enters a constant speed running state. At this time, the cassette lid is simultaneously opened.

Therefore, according to the above-described mechanism for protecting the tape during ejection, when the eject operator is operated while the tape is running at a constant speed, the head chassis 20 is moved backward and the tape stops running. Since the cassette lid is opened, sufficient tape protection can be achieved. In particular, with the above configuration, when the tape is running at a constant speed,
For example, when the tape is no longer running at a constant speed due to a power outage or battery power being exhausted, you can return the cassette tape recorder to its original stopped state by operating the eject operator, and the cassette tape It is extremely convenient.

Further, in the above description, the lock portion 461 is disengaged from the locking portion 437 in conjunction with the eject operator, but this means that an operating member is provided that allows the lock portion 461 to be disengaged from the locking portion 437 by external operation. It is only necessary to eject after the operation has stopped.

Next, FIG. 25 shows the erroneous erasure prevention switch 35.
and details of the cassette detection switch 36. Both switches 35 and 36 have a pair of leaf-shaped electrodes 35 on bases 351 and 361, respectively.
2,353 and 362,363 are planted. And both the above switches 35, 36
A pair of protrusions 354, 364 are provided on both sides of each base 351, 361, and a pair of protrusions 354, 364, respectively.
A pair of recesses 355 and 365 into which the recesses 64 are fitted are formed. Here, now the protrusion 36 of the base 361
By fitting the switch 4 into the recess 355 of the base 351, both the switches 35 and 36 are integrally arranged side by side.

Note that it is much easier to mold the base, for example, by connecting the two switches 35 and 36 and arranging them in parallel, and by configuring the two switches in advance on a common base. However, in the latter case, it was difficult to cut out the shape. Therefore, it is preferable in terms of manufacturing to form the two switches 35 and 36 separately and connect them later.

Both switches 35 and 36 connected here are mounted in a holder 56 formed as an outsert on the main chassis 11 of the cassette tape recorder, as shown in FIG. An engaging piece 356 that engages with the erroneous erasure prevention claw 571 of the tape cassette 57 is attached to one electrode 352 of the erroneous erasure prevention switch 35. Further, an engagement piece 366 that engages with the back surface of the tape cassette 57 is attached to one electrode 362 of the cassette detection switch 36.

The accidental erasure prevention switch 35 is turned on when the engagement piece 356 is pressed against the claw 571 when the tape cassette 57 has an accidental erasure prevention claw 571, and is turned off when the accidental erasure prevention claw 571 is not present. It is. When this accidental erasure prevention switch 35 is turned on, the LSI dedicated to controlling the tape recorder
When the recording operation member is operated, a control signal is output that allows the recording state, and when it is turned off,
Even if the recording operation member is operated on the LSI, a control signal is output that invalidates the operation. Also,
The cassette detection switch 36 detects when the tape cassette 57 is located on the reel stand 1 as shown in FIG.
2, 13, the back side of the tape cassette 57 presses the engagement piece 366 to turn it on. When the cassette detection switch 36 here is turned on, when the operation member for tape running is operated on the LSI, a control signal is outputted to drive the motor 16 in response to the operation, and the switch is turned off. Then, when the operation member for tape running is operated, a control signal is outputted to the LSI to invalidate the operation. In other words, when the tape cassette 57 is not installed, the reel stands 12, 13
This prevents it from rotating.

Here, for example, when the cassette detection switch 36 is mounted on the holder 56, the
As shown in FIG. 9, the holder 56 includes an engaging portion 561 that comes into contact with the engaging piece 366 and slightly biases the electrode 362, and an engaging portion 561 that comes into contact with the engaging piece 367 attached to the electrode 363, so that the electrode 362 is slightly biased. An engaging portion 562 that slightly biases 363 is formed.

For this reason, even if the electrodes 362 and 363 have a tendency to curve in such a way as to spread out from their bases or to narrow in, for example when manufacturing the cassette detection switch 36, they will not engage when attached to the holder 56. Since the distance between the electrodes 362 and 363 is regulated to be constant by the portions 561 and 562, reliable on/off operation of the switch can be performed. Further, since the electrodes 362 and 363 are biased in advance by the engaging portions 561 and 562, the engaging piece 366 is pressed, and the engaging piece 366 is slightly moved from the state where the electrode 362 is in contact with the electrode 363. Just by pressing, both the electrodes 362 and 363 are brought into contact with each other reliably, and the movement stroke of the engaging piece 366 can be reduced, which can contribute to downsizing of the tape recorder.

Note that the other accidental erasure prevention switches 35 are also attached to the holder 56 in the same manner as described above.

Therefore, according to the above-described mounting means for the accidental erasure prevention switch 35 and the cassette detection switch 36, the engaging portions 561, 562 of the holder 56
According to the electrodes 352, 353 and 362, 36
Since the position of switch 3 is determined, there is no problem even if there are variations in the distance between the electrodes of individual switches during manufacture. Further, the electrode 363 is connected to the engaging portion 5 of the holder 56.
62, the engagement piece 366
By only slightly pressing the electrode 362 in contact with the electrode 363, sufficient contact pressure can be obtained, and the movement stroke of the engagement piece 366 can be reduced.

It goes without saying that the leaf switches 45, 51, etc. described above may also be attached to the main chassis 11 in the same manner as described above.

The detailed structure and operation of each part of this cassette tape recorder has been described above, and the other structure for putting this cassette tape recorder into a constant tape running state and a queue/review state will be described below. In FIG. 30, the same parts as in FIG. 5 are indicated by the same symbols, and only the different parts will be explained here. That is, in FIG. 30, instead of the gear 43 shown in FIG. 5, a gear 58 is rotatably supported.
This gear 58 has notches 581 and 582 formed at predetermined positions that do not mesh with the gear 40.
Further, on one surface of the gear 58 facing the main chassis 11, a cam portion 584 is formed, which has a flat portion 583 in a portion and a curved portion in the shape shown in the figure. Between the cam portion 584 and the bent engagement piece 253 of the head slider 25, there is a
As described above, one end of the drive lever 44 is interposed.

On the other hand, a substantially ring-shaped guide groove 585 is formed on the other surface of the gear 58. Two locking portions 586, 587 are formed at predetermined positions on the inner peripheral wall of the guide groove 585, and two step portions 588, 589 are formed on the outer peripheral wall at positions substantially opposite to the locking portions 586, 587. It is formed. Further, at a predetermined position between the inner circumferential wall and the outer circumferential wall of the guide groove 585,
A branch wall 59 is formed. The lock portion 461 of the lock member 46 is connected to the guide groove 5.
85, and is pressed against the inner circumferential wall by the biasing force of the torsion spring 467.

Here, the lock portion 461 of the lock member 46 is
When the drive lever 44 is engaged with the locking portion 586 of the guide groove 585, one end of the drive lever 44 is engaged with the cam portion 5.
By being in contact with the flat part 583 of 84,
Although the gear 58 is biased counterclockwise in the figure, since the lock portion 461 is engaged with the locking portion 586, rotation of the gear 58 is prevented.

Further, a substantially L-shaped movable member 60 is rotatably supported at a corner portion of the rotation shaft 462 of the drive lever 46 . This movable member 60 is rotated clockwise in the figure by a spring 603 being engaged between a through hole 601 formed at one end thereof and a locking piece 602 formed as an outsert on the main chassis 11. However, the rotation in the clockwise direction in the figure is continued until the protrusion 604 formed at the other end of the movable member 60 comes into contact with a pin 605 formed as an outsert on the main chassis 11. . Further, at the other end of the movable member 60, an engaging piece 2 formed on the head chassis 20 is inserted through the through hole 521 formed in the main chassis 11 and protrudes toward the surface side of the main chassis 11.
A bent engagement piece 606 facing 05 is formed. Furthermore, one side of the movable member 60 faces the pin 464 of the locking member 46.

The operation of the above configuration will be explained. First, assume that the power switch is turned on from the stopped state shown in FIG. 30, and then the regeneration operation member is operated. Then, the solenoid plunger 48 is energized and its driving piece 481 is retracted, and the locking portion 461 of the locking member is disengaged from the locking portion 586 of the gear 58 as described above. The gear 58 is rotated counterclockwise in the figure by the biasing force applied via the drive lever 44 and meshes with the gear 40.

Then, as shown in FIG. 31, the gear 58 is rotated counterclockwise in the figure. At this time, the solenoid plunger 48 is energized for the time required for the locking portion 461 to disengage from the locking portion 586, so that the urging force of the torsion spring 467 applied to the locking member 46 causes the locking portion 4
61 is pressed against the inner circumferential wall of the guide groove 585 immediately after detachment. Therefore, the lock portion 461 is interposed between the inner circumferential wall of the guide groove 585 and the branch wall 59, so that the lock member 46 is attached to the torsion spring 4.
It is rotated counterclockwise in the figure against the urging force of 67. Then, the movable member 60 is pushed by the pin 464 of the lock member 46 and rotated counterclockwise in the figure against the biasing force of the spring 603, so that the bent engagement piece 606 engages the engagement piece of the head chassis 20. 205
He was moved to a position where he was no longer facing the enemy.

Further, at this time, the drive lever 44 is moved to the cam portion 584.
The head slider 25 and the head chassis 20 are rotated clockwise in the figure against the biasing force of the spring 444, and the head slider 25 and the head chassis 20 are accordingly slid upward in the figure as described above.

Then, as the gear 58 continues to rotate and the locking portion 587 of the guide groove 585 is locked with the locking portion 461 of the locking member 46 as shown in FIG. 32, the head chassis 20 corresponds to the tape constant speed running state. The tape is then moved to the position where the tape is run at a constant speed. At this time, a biasing force is applied to the gear 58 via the drive lever 44 to rotate the gear 58 counterclockwise in the figure.
Since the gear 58 is locked to the locking portion 587, rotation of the gear 58 is prevented. Further, the lock portion 461 of the lock member 46 is returned to its original position by the outer circumferential wall of the guide groove 585, but the movable member 60 is returned to its original position by the outer peripheral wall of the guide groove 585.
is engaged with the engagement piece 205 of the head chassis 20, and is held in the position rotated counterclockwise in the figure.

Here, in the explanation from FIG. 5 to FIG. 13, the cassette tape recorder is put into the queue or review state by operating the playback operation member and the fast forward or rewind operation member. The mechanism shown in the figures will be described assuming that, for example, a cue operation member and a review operation member (both of which are touch switch structures) are separately provided. That is, suppose that the queue operation member is operated from the state shown in FIG. 30 in order to put the cassette tape recorder into the queue state.
Then, the solenoid plunger 48 is energized and the lock portion 461 of the lock member 46 is engaged with the gear 5.
8 is released from the locking portion 586. Here, the time period for which the solenoid plunger 48 is energized when the cue operating member is operated is such that the locking portion 461 is simply disengaged from the locking portion 586 as when the tape constant speed running operating member is operated. As shown in FIG.
begins to rotate, and the lock portion 461 engages the guide groove 5.
85 and the branch wall 59. And the lock part 461
is interposed between the outer circumferential wall of the guide groove 585 and the branch wall 59, the locking member 46 is rotated clockwise in the figure, so that the movable member 60 moves toward its protrusion 604.
remains in the position where it contacts the pin 605, that is, the position where the bent engagement piece 606 faces the engagement piece 205 of the head chassis 20.

At this time, as described above, the drive lever 44 is rotated clockwise in the drawing by the curved portion of the cam portion 584, so that the head chassis 20 is moved forward via the head slider 25.

Then, as the gear 58 continues to rotate and the locking portion 587 of the guide groove 585 is locked with the locking portion 461 of the locking member 46 as shown in FIG. 34, the head slider 25 is fully moved upward in the figure. However, when the head chassis 20 moves forward, its engagement piece 205 bends and engages the movable member 60.
6 until it touches the position. In this position, the erase head 22 and the recording/playback head 23
is in light contact with the tape, and the pinch roller 22 is not pressed against the capstan 31 through the tape, and by controlling the motor 16 to run the tape in fast forward mode, the cassette tape recorder is brought into a queue state. It is what is done.

The same explanation as above can be made when the review operation member is operated, and in this case, the tape is rewound and the tape is in the review state.

Therefore, according to the configuration shown in FIG. 30, the lock portion 461 is guided by the inside and outside of the branch wall 59 formed on the gear 58 to control the position of the movable member 60, and the head chassis 20 Since the tape is regulated at a position corresponding to the tape constant speed running state and the queue/review state, one gear 58 can control the tape constant speed running and the queue/review state, and the configuration can be extremely simplified. It is possible. Furthermore, when the pause operation member (not shown) is operated in the state in which the tape is running at a constant speed as shown in FIG. If the time is set as the time until the outer peripheral wall of the groove 585 and the branch wall 59 are interposed, the intermediate stop state can be skipped and the state shown in FIG. 34 can be achieved, and at this time the rotation of the motor 16 is stopped. By doing so, a pause state can be realized with the same configuration.

Furthermore, although the cue and review operation members are provided separately in the above example, it is possible to detect that both the playback operation member and the fast forward and rewind operation members are operated, and to adjust the current supply time to the solenoid plunger 48. The circuit section may be configured so as to regulate the time required for the queue and review states.

Next, FIG. 35 shows still another structure for making the cassette tape recorder run at a constant tape speed and put in the queue and review states. Also, in FIG. 35, the same parts as in FIG. 5 are indicated by the same symbols, and only the different parts will be explained here. That is, in FIG. 35, instead of the gear 43 shown in FIG. 5, a gear 61 is rotatably supported. This gear 61 has three notches 611, 612, and 613 formed at predetermined positions that do not mesh with the gear 40. Further, on one side of the gear 61 facing the main chassis 11, a cam portion 615 is formed, which has a flat portion 614 in a portion and a curved portion in the shape shown in the figure. As described above, one end of the drive lever 44 is interposed between the cam portion 615 and the bent engagement piece 253 of the head slider 25.

On the other hand, a substantially ring-shaped guide groove 616 is formed on the other surface of the gear 61. Three locking portions 617, 618, 619 are formed at predetermined positions on the inner peripheral wall of the guide groove 616, and two locking portions 617, 618, 619 are formed on the outer peripheral wall at positions substantially opposite to the locking portions 617, 619.
Two step portions 621 and 622 are formed. Further, in the portion between the inner circumferential wall and the outer circumferential wall of the guide groove 616 and between the locking portions 618 and 619,
A branch wall 62 is formed. The lock portion 461 of the lock member 46 is connected to the guide groove 6.
16, and is pressed against the inner circumferential wall by the biasing force of a torsion spring 467.

Here, the lock portion 461 of the lock member 46 is
When the drive lever 44 is engaged with the locking part 617 of the guide groove 616, one end of the drive lever 44 is engaged with the cam part 6.
By being in contact with the flat part 614 of 15,
Although the gear 61 is biased counterclockwise in the figure, since the lock portion 461 is engaged with the locking portion 617, rotation of the gear 61 is prevented.

The operation of the above configuration will be explained. First, it is assumed that the power switch is turned on from the stopped state shown in FIG. 35, and then the regeneration operation member is operated. Then, the solenoid plunger 48 is energized and its drive piece 481 is retracted, causing the locking portion of the locking member 46 to engage the gear 61.
The gear 61 is disengaged from the locking portion 617, and the gear 61 is rotated counterclockwise in the figure by the biasing force applied via the drive lever 44 and meshed with the gear 40. Then, when the gear 61 is rotated counterclockwise in the figure and the locking portion 619 is locked with the lock portion 461 as shown in FIG. 36, the notch 613 of the gear 61 faces the gear 40. It will no longer be rotated. At this time, the drive lever 44 is rotated clockwise in the figure by the curved portion of the cam portion 615 against the biasing force of the spring 444, and the head slider 25 and head chassis 20 are moved forward and the tape is moved forward. The vehicle will be running at a constant speed.

At this time, the gear 61 also includes the drive lever 4.
A biasing force is applied to rotate the gear 61 in the counterclockwise direction in the figure through the gear 461.
rotation is prevented.

For example, suppose that the fast-forward operation member is operated while the tape is running at a constant speed. Then, the solenoid plunger 48 is energized and the lock portion 4
61 is released from the locking portion 619. Here, since the solenoid plunger 48 is energized for the time required for the lock portion 461 to disengage from the locking portion 619, the lock portion 461 is pressed against the inner peripheral wall of the guide groove 616 immediately after disengagement.

Then, the gear 61 is rotated counterclockwise in the figure by the biasing force applied via the drive lever 44, and as shown in FIG. , the notch 612 is no longer rotated facing the gear 40. At this time, the drive lever 44 is returned slightly counterclockwise in the figure, so the head slider 25 and head chassis 20 are moved back slightly, and the erasing head 22 and recording/playback head 23 are brought into light contact with the tape, and the pinch roller 28 is placed at a position where it is not pressed against the capstan 31 via the tape. and,
The tape is fast-forwarded and a queued state is achieved.

Further, even if the rewind operation member is operated from the state shown in FIG. 36, the state shown in FIG. 37 will be reached, and the tape will be rewound and run, resulting in a review state.

On the other hand, assume that the stop operation member is operated from the tape constant speed running state shown in FIG. 36. Then,
The solenoid plunger 48 is energized, the lock portion 461 is disengaged from the locking portion 619, and the gear 6
1 is rotated counterclockwise in the figure and meshed with the gear 40. At this time, the solenoid plunger 48
The time when the current is applied to the lock part 461 is
The outer peripheral wall of the guide groove 616 and the branch wall 62
and the time it takes to intervene. Therefore, the lock portion 461 passes over the locking portion 618 and is locked with the locking portion 617 as shown in FIG. 35, thereby stopping the tape running.

Therefore, according to the configuration shown in FIG. 35, substantially the same effect as shown in FIG. 30 can be obtained. Further, the state shown in FIG. 37 can also be used for the pause function.

Then, as described above, three locking portions 617 to 619 are formed on the gear 61, and the position of the head chassis 20 is regulated with the lock portion 461 being locked to the three locking portions 617 to 619, respectively. This is a feature of this invention.

The mechanical aspects of the cassette tape recorder described here have been described above, and the circuit aspects will be explained below. First, the above-mentioned cassette tape recorder is of a so-called two-motor drive system in which the motor 16 for rotating the reel stands 12 and 13 and the motor 41 for driving the capstan 31 are provided separately. In such a two-motor drive type cassette tape recorder, the most important points are when the pinch roller 28 is pressed against the capstan 31 to start tape running, and when the motor 16 is driven and the reel stand 12,
13 is rotated to coincide with the timing at which tape winding is started.

That is, the pinch roller 28
If the reel stands 12 and 13 rotate before the tape is pressed against the reel stand 12 and 13, the tape will run at a faster speed than the normal constant running speed. 23
is brought into contact with the tape, the pinch roller 28
There is a problem in that a high-speed reproduction sound called "Kyutsu" is generated until the capstan 31 is completely pressed against the capstan 31. Further, after the pinch roller 28 is pressed against the capstan 31, the reel stand 1
When the tapes 2 and 13 are rotated, the tape sent out by the capstan 31 is not wound up and becomes slack, and when the reel stands 12 and 13 are then rotated, all of this slack tape is wound at once. The tape tension after being removed can cause undesirable situations such as wows and flutters or tape dancing.

Therefore, in the above-mentioned cassette tape recorder, the circuit shown in FIG.
The timing is made to coincide with the start of tape winding due to the rotation of the . In the circuit shown in FIG. 38, changes in signals at each point are shown in FIGS. 39A to 39H, respectively. In other words, if the tape constant speed running operation member is operated at time _T1 , the input terminal 63 receives the signal shown in FIG. 39A.
High level as shown in (hereinafter referred to as H level)
signal is supplied. Then, a current sufficient to drive the solenoid plunger 48 flows for a predetermined time (until time T ₁ ') at the middle point in FIG. 38, and the solenoid plunger 48 is driven. In addition, the operations previously described with reference to FIGS. 5 to 8 are performed.

At this time, since the motor 41 has been rotated in advance by turning on the power switch, a predetermined current as shown in FIG. 39B is flowing through the motor 41. It is assumed that the pinch roller 28 is brought into pressure contact with the capstan 31 at time _T2 in the process of transitioning from the state shown in FIG. 5 to the state shown in FIG. Then, the motor 4 that rotationally drives the capstan 31
Due to the load caused by the pinch roller 28 being pressed into contact with the pin 1, a large current momentarily flows through the pin 1 as shown in FIG. 39B. Therefore, the potential at the middle point in FIG. 39 is brought to _a low level (hereinafter referred to as L
level).

Here, the potential at the middle point in Figure 38 is
When an H level is supplied to the input terminal 63 at time _T1 , it is once brought to an L level due to the influence of the capacitor _C2 , but it becomes an H level again at time _T2 . As a result, the potential at the middle point in FIG. 38 becomes H level as shown in FIG. 39F. The potentials at the points in FIG. 38 are set to L and H levels as shown in FIG. 39 G and H, respectively. Then, this H level output is output from the output terminal 64.
The signal is supplied to, for example, an LSI dedicated to controlling the cassette tape recorder. This LSI rotates the tape running motor 16 when the output terminal 64 is set to H level.

Note that the solenoid plunger 48 is
As shown in FIG. 9E, the driving piece 481 at time T ₁ '
Although the action of drawing in is stopped, after the time T ₁ ', a small current (current insufficient to drive the solenoid plunger 48) continues to flow during the constant speed tape running state.

Therefore, with the circuit for controlling the drive of the motor 16 as described above, it is possible to prevent the current flowing through the motor 41 from momentarily increasing due to the load when the pinch roller 28 is pressed against the capstan 31. Motor 1 for detecting and rotating reel stands 12 and 13
6 is rotated, so when the tape starts running by the capstan 31 and when the reel stand 1
This makes it possible to easily match the timing with the start of tape winding in steps 2 and 13.

Next, FIG. 40 shows a circuit for applying voltage to the motor 16 and the solenoid plunger 48. In the circuit shown in FIG.
Changes in the signal at that point are shown in FIGS. 41 and 41, respectively. In addition, Fig. 41,
represent the voltages applied to the motor 16 and the solenoid plunger 48, respectively. First, when the power switch of the cassette tape recorder is turned on, a DC voltage (+B) is applied to the power supply terminal 65. Therefore, the potential at the middle point in FIG.
As shown in the figure, a constant potential is established.

Assume that in this state, the tape constant speed running operation member is operated at time _T1 . Then, an H level signal as shown in FIG. 41 is supplied to the input terminal 66. For this reason, transistor Q ₁
is turned on, and the potential at the middle point in FIG. 40 is brought to approximately the ground potential as shown in FIG. 41. At this time,
Transistors Q ₂ and Q ₃ are turned on, and the potential at the middle point in FIG. 40 is made substantially the same as the potential at the middle point in FIG. 40, as shown in FIG. 41, and the solenoid plunger 48 is energized and driven. Further, at this time, no current flows through the motor 16 and the motor 16 is not driven to rotate.

Here, as shown in FIG. 41, the potential at the middle point in FIG. 40 decreases as the capacitor _C3 is charged, so that the potential at the _midpoint of FIG. As a result, a current sufficient to drive the solenoid plunger 48 no longer flows through the solenoid plunger 48, so that its operation is stopped. At this time, a current flows between the middle point and the point in FIG. 40, that is, a voltage as shown in FIG. 41 is applied to the motor 16, and the motor 16 is driven to rotate.

In FIG. 40, reference numerals 67 and 68 are input terminals, which, when the fast forward and rewind operation members are operated, go to H level and turn on the transistors Q ₄ and Q ₅ , respectively. When these transistors Q ₄ and Q ₅ are turned on, the polarity of the voltage applied to the motor 16 is reversed, and the tape is run in the forward and reverse directions.

Therefore, according to the above circuit configuration, when the tape constant speed running operation member is operated, a substantially direct current voltage (+B) that bypasses the voltage applied to the motor 16 is applied to the solenoid plunger 48. The solenoid plunger 48 is driven, and then the voltage applied to the solenoid plunger 48 is supplied to the motor 16 to run the tape at a constant speed.In other words, the motor 16 and the solenoid plunger 48 are also connected in series to generate a DC voltage ( +B) are applied as divided voltages, and the capacitor
Since a time difference is provided between the voltages applied to the motor 16 and the solenoid plunger 48 by C ₃ , there is no need to separately provide a circuit for controlling the voltages applied to the motor 16 and the solenoid plunger 48, and the circuit is extremely simple. The configuration can be simplified.

Regarding this point, conventionally, a circuit that generates enough voltage to stably drive the motor for rotating the drill stand based on the DC power supply voltage, and a circuit that once drives the solenoid plunger based on the DC power supply voltage and then stops it. Since the circuit that generates the voltage that causes the voltage to be generated is separately configured, the number of parts increases and the configuration becomes complicated. For example, as a circuit that generates a voltage that once drives a solenoid plunger and then stops it, conventional circuits are shown in Figures 42a and 42b.
There is something like this. That is, Figure 42a
The circuit shown in FIG. 43 will be briefly explained with reference to FIG. 43. When the tape constant speed running operation member is operated at time _T1 , an H level is applied to the input terminal 69. When the H level rises, the base current flows through the capacitor _C4 to the transistor _Q6 , so the transistor _Q6 turns on.
The solenoid plunger 70 has B/ shown in FIG.
A current Z ((B: DC voltage, Z: impedance of the solenoid plunger 70) flows, driving the solenoid plunger 70. Then, when the capacitor _C4 is charged, the transistor _Q6 is turned off and the transistor _Q7 is turned off. Then, the current regulated by the resistor R, that is, the current B/Z+R shown in FIG. 43 flows through the solenoid plunger 70, and the operation of the solenoid plunger 70 is stopped. In addition, the circuit shown in FIG. 42b operates in substantially the same manner, resulting in the current flowing through the solenoid plunger 70 as shown in FIG. 43. be.

However, in the conventional circuit as shown in FIGS. 42a and 42b, the resistor R must have a large resistance value, which has the disadvantage of increasing power consumption.

However, according to the configuration shown in FIG. 40, since the DC voltage (+B) is divided and supplied to the motor 16 and the solenoid plunger 48, it is necessary to provide a separate circuit to apply the desired voltage to both. There is no need for the resistor R, which simplifies the configuration, and also eliminates the need for the resistor R, reducing power consumption. Further, if the tape is undesirably cut while the tape is running at a constant speed, the motor 16 will be in a substantially no-load state, so the current flowing through the motor 16 and the solenoid plunger 48 will increase, and at this time, the solenoid plunger 48 can also be driven to stop the cassette tape recorder.

Next, when the mechanism as previously explained in FIGS. 5 to 13 is used, for example, in a small portable cassette tape recorder, the gears 43 and 49 are placed in the positions shown in FIGS. 5 and 10, respectively. Assume that the cassette tape recorder is carried around in a stopped state. If the product is subjected to a strong impact while being carried around, in very rare cases, for example, the lock member 5 may be damaged.
The locking portion 541 of the gear 49 may disengage from the locking portion 494 of the gear 49, resulting in the gear 49 meshing with the gear 40. At this time, since the power switch is not turned on and the gear 40 is not rotating, the gear 49 is in the state shown in FIG. 11.

When the user first turns on the power switch in this state, the gear 40 rotates and the gear 49 moves to the first position.
The state shown in Figure 3 is achieved. At this time, since none of the operating members that cause the tape to run has been operated yet, the motor 16 is not rotated and the tape is not running. When the user operates the playback operation member, for example to play back a tape,
The gear 43 changes from the state shown in FIG. 5 to the state shown in FIGS.
The state shown in FIG. 8 is reached. However,
At this time, since the gear 49 is in the state shown in FIG. 13, the head chassis 20 is regulated to a position slightly retracted from the position in the tape constant speed running state, that is, a position corresponding to the queue, review, and pause states.

On the other hand, at this time, since the reproducing operation member is being operated, the motor 16 is rotated by the LSI at a rotational speed and direction corresponding to the constant speed tape running state, and the tape is running. In other words, even though the mechanical part is in the queue, review, or pause state, the circuit part (LSI, etc.) rotates the motor 16 at a rotation speed and rotation direction corresponding to the tape constant speed running state. A phenomenon occurs that does not correspond to the state of the circuit part.

Therefore, in the above-mentioned cassette tape recorder, the mechanical part and the circuit part are made to correspond to each other by using the circuit shown in FIG. In other words, 7 in the figure
Reference numeral 1 denotes an input terminal to which H and L level signals are supplied in accordance with the operation of the tape constant speed and high speed running operation members. The reel motor drive circuit 72 controls the motor 16 at a rotation speed and rotation direction corresponding to constant speed and high speed tape running conditions by receiving H and L levels at its input terminal. Further, the switch 73 is a switch that is turned on when the gear 49 is in the state shown in FIG. 13, and input terminals 74 to 76 are supplied with H level signals in response to the operations of the fast forward, rewind, and pause operation members, respectively. It is something that will be done. Furthermore, the one shot circuit 77 operates when the terminal B _IN is at H level and the terminal A _IN is inverted from L level to H level, and when the terminal A _IN is at L level and the terminal B _IN is inverted from H level to L level. Each of these generates one pulse.

To explain the operation, first, in the normal tape playback state, the input terminal 71 is set to H level, the switch 73 is turned off, the input terminals 74 to 76 are set to L level, and the reel motor drive circuit 72 is set to the motor 16.
is controlled so that the tape is running at a constant speed. At this time, the output terminal of the OR circuit 78 is at L level, and the terminals A _IN and B _IN of the one shot circuit 77
are set to L and H levels, respectively. In such a state, for example, when the rewind operation member is operated, the input terminal 75 becomes H level, and the switch 7
3 turns on. Then, the output terminal of the OR circuit 78 becomes H level, and the transistors T _r1 and T _r2 are turned on. For this reason, the reel motor drive circuit 72
is supplied with the L level, and the motor 16 is driven to rotate so as to enter the tape rewinding state. In addition, since the terminal A _IN of the one shot circuit 77 remains at L level and the terminal B _IN is inverted to L level, one pulse is applied and the solenoid plunger 55 is driven, resulting in the review state. It is.

Here, as mentioned earlier, when the regeneration operation member is operated from the stopped state, the gear 49 is moved to the first position.
Assume that in the state shown in FIG. 3, a phenomenon occurs in which the motor 16 is rotated at a rotational speed and direction corresponding to a tape constant speed running state, and tape running is performed. Then, the input terminal 71 is at H level, the switch 73 is on, and the input terminals 74 to 76 are at L level. At this time, transistors T _r1 and T _r2
is turned off, and the terminals A _IN and B of the one-shot circuit 77
_IN becomes H level.

Then, when the user confirms that the above phenomenon has occurred, the user operates the pose operation member. Then, the output terminal of the OR circuit 78 becomes H level and the transistor T _r1 is turned on, so that the terminal A _IN of the one shot circuit 77 becomes L level. At this time, the terminal B _IN of the one shot circuit 77 is inverted to L level and one pulse is output. Therefore, the solenoid plunger 55 is driven and the gear 49 is placed in the position shown in FIG.

Then, the switch 73 is turned off in conjunction with the gear 49, and the transistor T _r1 is also turned off. At this time, the terminal B _IN of the one shot circuit 77 becomes H level, the terminal A _IN is also inverted to H level, and one pulse is output again. Then, the solenoid plunger 55 is driven, and the gear 49 returns to the state shown in FIG. In the pause state, the circuit part also becomes the pause state and can take action.

Therefore, according to the above configuration, when the gear 49 is undesirably in the state shown in FIG. 13 due to an impact or the like and the playback operation member is operated, the pause operation member cannot be operated. By doing so, one pulse is generated twice from the one-shot circuit 77 and the gear 49 is rotated once as shown in FIG. It is something that can be treated.

Moreover, contrary to the above, if the fast forward or rewind operation member is operated when the gear 43 is in the state shown in FIG. (playback is not performed in the recording/playback head 23), and without damaging the tape, operate the stop operation member to return the cassette tape recorder to its original stopped state, and then fast forward or wind the tape again. All you have to do is operate the return operation member.

Next, in the above-mentioned logic-oriented cassette tape recorder, when changing from a high-speed tape running state to a tape constant-speed running state, for example, first operate the stop operation member to bring the operation to a halt state, and then switch the tape to a constant-speed running state. There is no problem if the operating member is operated, but it is more convenient to be able to directly operate the tape constant-speed running operating member from the state where the tape is running at high speed. If you directly change the tape running mode in this way, for example from the tape rewind state to the playback state, and the tape running direction is abruptly reversed, undesirable situations such as damage or breakage of the tape may occur. occurs.

Therefore, in the above-mentioned cassette tape recorder, the fourth
A circuit as shown in Figure 5 is used. That is, 79 in the figure is a playback operation member, and when this is operated, a flip-flop circuit (hereinafter referred to as FF circuit) 80 is set, and its set output (46th FF circuit) is set.
(see Figure a), the one-shot circuit 81 is driven, and the solenoid plunger 48 is driven. In this state, when the rewind operation member 82 is operated, the FF circuit 83 is set, and the one shot circuit 8 is set by the set output (see FIG. 46b).
4 is driven, solenoid plunger 55 is driven. The one-shot circuits 81 and 84 are
It outputs one pulse under the same conditions as the one-shot circuit 77. Then, the cassette tape recorder is placed in a review state. At this time, a high voltage shown in FIG. 46e is applied to the motor 16.

In this state, the playback operation member 79 is
When operated with T ₁ , the set input terminal S of the FF circuit 80
A pulse is provided in FIG. 46c. This pulse is also supplied to the clear input terminal CL of the FF circuit 83, and the FF circuit 83 is reset as shown in FIG. 46b. At this time, a low voltage shown in FIG. 46e is applied to the motor 16, and the rotation is controlled to correspond to the tape playback state. Then, one end ₂ of the output of the FF circuit 83 becomes H level, and at time _T2 delayed by the charging time to the capacitor C, one pulse is output from the one shot circuit 84 as shown in FIG. 46d, and the solenoid plunger 55 is driven. The gear 49 is then returned to the position shown in FIG. 10, and the cassette tape recorder is again placed in the playback state.

Therefore, according to the above configuration, when the rewinding state is directly transferred to the reproducing state, the voltage supplied to the motor 16 is first switched to a low value, and the voltage supplied to the motor 16 is switched to a low level.
Since the pulse output from the one-shot circuit 84 is delayed for a period of time until the rotational speed and rotational direction of the tape 6 become constant, even if the tape running speed and running direction change, unnecessary tension is not applied to the tape. This can prevent damage to the finished tape. Furthermore, the same explanation can be given when directly transitioning from the fast-forward state to the playback state. In this case, the tape running direction is the same but the tape running speed changes, so tape slack and capstan 31 It is possible to prevent tape wrapping, etc. That is, when switching from the fast forwarding state to the reproducing state, first, the voltage applied to the motor 16 is delayed until the rotational speed of the holding motor 16 is stabilized, and the solenoid plunger 55 is driven to press the pinch roller 28 against the capstan 31. It's fine if you do it like this.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

Therefore, as described in detail above, according to the present invention, it is possible to provide an extremely good tape recorder drive mechanism that has a simple configuration, consumes little power, and is especially suitable for small portable tape recorders.

[Brief explanation of the drawing]

1 and 2 are front and back views showing the overall structure of a cassette tape recorder to which the present invention is applied, and FIG. 3 is a perspective view showing a mechanism for making the cassette tape recorder run at a constant tape speed. figure,
FIG. 4 is a perspective view showing a mechanism for putting the cassette tape recorder into a high-speed tape running state, and FIGS. 5 to 9 are explanatory diagrams of the operation of the mechanism shown in FIG. 3, respectively.
10 to 13 are explanatory diagrams of the operation of the mechanism shown in FIG. 4, FIG. 14 is a configuration diagram showing the connection means between the solenoid plunger and the lock release lever, and FIGS. 15 and 16 are the same connection. FIG. 17 is a characteristic curve diagram of the solenoid plunger; FIG. 18 is a configuration diagram showing the engagement state between the locking portion of the locking member and the locking portion of the gear;
Figure 9 is an explanatory diagram of the force relationship in the same engaged state, the second
0 and 21 are configuration diagrams showing a modification of the configuration shown in FIG. 18, respectively. FIGS.
3 is an explanatory diagram of the operation of the same eject member, FIG. 24 is a configuration diagram showing another example of the eject member, and FIG. 25 is a diagram illustrating the operation of the eject member.
The figure is an exploded perspective view showing the connection means for the accidental erasure prevention switch and the cassette detection switch, Figure 26 is a perspective view showing both switches attached to the holder, and Figure 27 is the engagement between the switch and the tape cassette. 28 and 29 are side views and perspective views showing the means for attaching the switch to the holder, respectively, and FIG.
31 to 34 are respectively explanatory views of the operation of the mechanism shown in FIG. 30, and FIG. 35 shows an embodiment of the tape recorder drive mechanism according to the present invention. 36 and 37 are operational explanatory diagrams of the same embodiment, FIG. 38 is a circuit diagram for defining the rotation start timing of the reel table rotation motor, and FIGS. 39A to 39B are respectively Fig. 38 is a timing diagram showing the signal states of each part of the circuit, Fig. 40 is a circuit configuration diagram for applying appropriate voltage to the motor for rotating the reel stand and the solenoid plunger, and Fig. 41 A to G are each Fig. 40 is a timing diagram showing the signal states of each part of the circuit, Figs. 42a, b, and 43 are a conventional circuit configuration diagram for applying an appropriate voltage to the solenoid plunger, and a diagram of the current flowing through the solenoid plunger, respectively. 44 is a timing diagram, and FIG. 45 is a circuit configuration diagram for matching the states of the mechanical part and the circuit part of the cassette tape recorder.
The figure is a circuit configuration diagram for protecting the tape when the tape is directly transferred from a high-speed tape running state to a constant tape running state.
FIG. 3 is a timing diagram showing signal states of each part of the circuit shown in the figure. DESCRIPTION OF SYMBOLS 11... Main chassis, 12, 13... Reel stand, 14, 15... Gear, 16... Motor, 17... Gear, 18... Friction member, 19... Gear, 20... Head chassis, 21... Head mounting body, 22... Erasing head, 23 ...recording/playback head, 24...plate spring, 25
...Head slider, 26, 27...Spring, 2
8...pinch roller, 29...pinch lever, 30...
Torsion spring, 31... Capstan, 3
2...Flywheel, 33...Eject member, 3
4... Spring, 35... Accidental erasure prevention switch, 3
6...Cassette detection switch, 37...Brake member, 3
8... Torsion spring, 391, 392... Brake element, 40... Gear, 41... Motor, 42... Belt, 43... Gear, 44... Drive lever, 45... Leaf switch, 46... Lock member, 47... Lock release lever, 48...Solenoid plunger, 49...
Gear, 50... Drive lever, 51... Leaf switch, 52... Head return lever, 53... Brake release lever, 54... Lock member, 55... Solenoid plunger, 56... Holder, 57... Tape cassette, 58... Gear, 59... Branch Wall, 60... Movable member, 61... Gear, 62... Branch wall, 63... Input terminal, 64... Output terminal, 65... Power supply terminal, 66 to 69... Input terminal, 70... Solenoid plunger,
71... Input terminal, 72... Reel motor drive circuit, 73... Switch, 74 to 76... Input terminal,
77...One shot circuit, 78...OR circuit, 79
...Reproduction operation member, 80...FF circuit, 81...One shot circuit, 82...Rewind operation member, 83...FF
Circuit, 84...One-shot circuit.

Claims (1)

[Claims] 1. A first rotating body that rotates independently of tape running, and a first rotating body that is engaged with the first rotating body so as to transmit rotational force and is not engaged with the first rotating body.
The second to third non-engaging portions are formed at predetermined positions.
a rotating body, a substantially ring-shaped guide portion formed on one side of the second rotating body, a lock member having a lock portion guided by the guide portion, and a lock member formed on the guide portion and having a lock portion; first to third locking portions that position the first to third non-engaging portions of the second rotating body to face the first rotating body when the portions are engaged; and the guide. a branching part formed between the second and third locking parts, dividing the guide part into two in the radial direction and creating two types of passages for guiding the lock part; urging means for urging the second rotary body in the engagement direction when the lock portions are respectively engaged with the locking portions; The head chassis is moved to a position corresponding to a tape running stop state, a position slightly retreating from a tape constant speed running state, and a tape constant speed running state with the parts engaged with the first to third locking parts, respectively. The locking section is moved to the first to third positions in conjunction with the operation of the cam section that moves the tape recorder to a predetermined operating state or the stopped state.
an electromechanical converter that disengages the locking portion of the locking portion and causes the locking portion to pass through one side and the other side of the branch portion depending on the operated operator; A drive mechanism for a tape recorder, characterized in that the lock portion is disengaged and engaged with the second locking portion by passing through one side and the other side of the branch portion.