JPS6182355A - Cassette deck - Google Patents

Abstract

PURPOSE:To miniaturize the entire cassette by detaching a pinch roller alternatively from a capstan with a head rotary mechanism. CONSTITUTION:A front part and a rear end part of a slide member 56 are provided with two notches 56c expanded in the forward/reverse direction and opposed to open ends. Any of them is engaged alternatively with a pin 91a of an arm member 91 in the notch 56c attended with reciprocating motion of the slide member 56. The pin 91a is guided smoothly by a taper 56d of the front edge of the open part of each notch 56c. The arm member 91 is turned around the pin 91a by a prescribed part and a pinch roller 90 is detached from the capstan 30a. That is, a couple of the pinch rollers 90 are detached alternatively from the capstan 30a by the reciprocating movement of the slide member 56 constituting the head turning mechanism. Thus, the entire device is miniaturized in comparison with the deck where the turning mechanism of the magnetic head and the attaching/detaching mechanism for the pinch roller 90 are provided individually.

Description

[Detailed description of the invention] Technical field The present invention relates to a cassette deck.

Background Art In recent years, cassette decks have been becoming more and more compact, especially when it comes to in-vehicle cassette decks.

Since there is a limit to the space in which a cassette deck can be accommodated, there is a strong demand for miniaturization.

Furthermore, when playing back a 4-track magnetic tape that has been recorded in both forward and reverse directions, the cassette half is usually reversed and replaced when playback in one direction is completed, but this replacement is troublesome. A cassette deck with a built-in so-called auto-reverse mechanism has been developed to solve this problem. As is well known, an auto-reverse mechanism automatically reverses the magnetic tape and sets the magnetic head to match tracks in both forward and reverse directions.

A number of configurations have already been proposed in which the magnetic head can be switched between forward and reverse directions. For example, when playing back a four-track magnetic tape, four channels of magnetic heads are provided and two of the four channels are used to run the magnetic tape in forward and reverse directions. There are two types: one in which the magnetic head is electrically switched according to the forward and reverse movement of the tape, and the other in which a two-way magnetic head is installed and the main body of the magnetic head is mechanically translated or rotated in accordance with the forward and reverse running of the tape. Among magnetic head switching formats, azimuth adjustment can be performed independently for both forward and reverse running of the magnetic tape, and therefore better reproduction frequency characteristics can be obtained compared to other formats. The format is adopted.

On the other hand, as a configuration for causing the magnetic tape to run in reverse, a pair of pinch rollers, each of which is freely movable IIRW with respect to the capstan, is selectively moved from the capstan to the ltl[1112] as the magnetic head rotates. and an idler gear that is removably provided for a pair of reel units that are not to be engaged with the cassette reel and that transmits the rotational driving force from the drive source to the reel units is selected in accordance with the rotation of the magnetic herad. A mechanism for temporarily removing the reel unit from the reel unit is often provided.

In already developed cassette decks, a mechanism for rotating the magnetic head and a mechanism for attaching and detaching the pinch roller and idler gear, respectively, were provided separately.

Therefore, this has been a problem in reducing the size and cost of the cassette deck as a whole.

The present invention has been made in view of the above points, and its purpose is to provide a cassette deck that is easy to downsize as a whole and is inexpensive. It is.

The cassette deck according to the present invention includes a magnetic head rotatably supported around an axis substantially perpendicular to a magnetic tape contact surface, and a head rotation 111 for rotating the magnetic head.
1f6, and a pair of pinch rollers each detachably provided to the capstan, the pinch rollers being selectively detachable from the capstan by the head rotation mechanism. There is.

Further, the cassette deck according to the present invention includes a magnetic head rotatably supported around an axis substantially perpendicular to the magnetic tape contact surface, a head rotation mechanism for rotating the magnetic head, and a 4:17 pushbutton. A pair of pinch rollers, each of which is removably provided to the pair of reel units to be engaged with the cullet reel, are each removably provided to transmit the rotational driving force from the drive source to the reel unit. and an idler gear, and the pinch roller and idler gear are selectively detached from the capstan and reel unit by the head rotation mechanism Ia.

Embodiment Hereinafter, a cassette deck as an embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, reference numeral 1 indicates the entire cassette deck.

As shown in FIG. 1, the front surface of the housing 2 is provided with a rectangular and laterally elongated opening 2a into which a cassette half (described later) is inserted. However, the term "forward" as used herein refers to the direction indicated by the arrow Y in the figure, and the left-right direction refers to the direction toward the front. Therefore, the arrow x direction is to the left, and the arrow 2 direction is upward.

As shown in FIGS. 2 and 3, as well as FIGS. 9 and 10, inside the housing 2 is a chassis 3 made of a steel plate or the like.
is provided. As shown in FIG. 4, a pair of reel units 5 are arranged side by side in the front-rear direction on the chassis 3, and are rotatably attached to the chassis. As is clear from FIG. 11, the reel unit 5 has a rotating shaft 5a fixed to the chassis 3. A reel 5b is rotatably fitted onto the rotation support shaft 5a. A collar 50 and a bush 5d are fitted to the upper and lower ends of the reel 5b, respectively. The collar 50 can be fitted into a current reel which is housed in the cassette half and has one magnetic tape wound thereon. A disk-shaped enlarged diameter portion 5e is formed in the center of the reel 5b, and a double gear 5f having two large and small gear portions is disposed between the enlarged diameter portion and the bush 5d. ■Tsu,
It is rotatably mounted on a rotating support shaft 5a.

A coil spring 5g is interposed between the double gear 5f and the bush 5d, and biases the double gear and the bush in a direction that separates the double gear and the bush. Further, a felt plate 5h is provided between the enlarged diameter portion 5e of the reel 5b and the double gear 5f. The felt plate 5h is attached to the enlarged diameter portion 5e, and is in slidable contact with the double gear 5f. An arm 51 is provided between the upper surface of the enlarged diameter portion 5e and the collar 5C, and one end of the arm 51 is rotatably attached to the outer periphery of the reel 5b.The lower surface of the arm 51 The enlarged diameter portion 5e of the reel 5b and the collar 50 are on the upper surface.
are slidably engaged with each other via washers 5j and 5k, and a coil spring 5Q is arranged between the upper washer 5 and the arm 51 to bias the arm downward.

As shown in FIGS. 2, 3, 9, and 10, an intermediate lever 7 is disposed on the right side of the reel unit 5 and extends approximately in the front-rear direction. A shaft 1 is mounted on the chassis 3 so as to be rotatable in a plane parallel to the main surface of the chassis. A rectangular opening 7b is formed at the front end of the intermediate lever 7, and a floating lever 8 movably provided on the chassis 3 is inserted into the opening.
A protruding bottle 8a is loosely fitted into the center of the bottle.

The floating lever 8 has bottles 8b protruding from both ends thereof, and each bottle is slidably engaged in a long hole 5m formed at the free end of the arm 51 of the reel unit 5. ing. As shown in FIGS. 7 and 18, an end detection lever 10 is disposed near the rear end of the intermediate lever 7. As shown in FIGS. This end detection lever 10 is connected to a sub-chassis Δ1 that is fixed to the upper surface of the rear end of the chassis 3 so as to protrude upward.
one end of a lever AI2 rotatably provided on the lever AI2;
In this case, it is attached to the right end of the lever A so as to be pivotable at its upper end. A projection 10a extending downward is provided at the lower end of the end detection lever 10, and the projection is slidably engaged with a notch 7C formed at the rear end of the intermediate lever 7.

As shown in FIGS. 7, 9, and 18, a bin 10b is provided protruding from the rear surface of the lower end of the end detection lever 10, and the bin is rotatably attached to the subchassis Δ. Further, it engages with an end detection gear 14 facing the rear end surface of the end detection lever 10. As is clear from FIGS. 7 and 18, the surface of the end detection gear 14 facing the end detection lever 10 has a recess i7!1. A is formed, and three substantially mountain-shaped protrusions 14b having the same shape and projecting in the radial direction of the end detection lever are provided at a pitch of 1200 on the circumferential side of the recess. Further, in the center of the four parts 14a, one projection 14C of the same shape is formed, which extends radially in the valley between the above-mentioned mountain-shaped projections 14b. When a circle circumscribing the top of each protrusion 14t1 and a circle inside the top of each protrusion 14.0 are imagined, the diameters of these circles are approximately the same size. The bottle 10b protruding from the end detection lever 10 has these protrusions 14b and 14. c.

The reel unit 5 described above, the intermediate lever 7, the floating lever 8, the end detection lever 10, and the end detection gear 1
4 constitutes a part of a tape end detection mechanism for detecting the end of the magnetic tape being played.

As shown in FIG. 2, FIG. 7, FIG. 9, and FIG.
On the left side are four gears 16.17.1 meshing in series.
A gear transmission mechanism 20 consisting of gears 8 and 19 is provided, and the end detection gear 14 meshes with the final stage gear 19 of the gear transmission ta 4ft. As shown in FIG. 18, the first stage gear 16 of the gear transmission mechanism 20 (however, reference numeral 20 is not shown in FIG. 18) is connected to the subchassis A11.
-10= Rotatably engaged [meshed with the pulled worm 22]. A pulley 23 is integrally formed at the lower end of the worm 22. As shown in FIG.
is rotationally driven via a belt 25 by a motor 24 disposed at the right rear end of the sillage 3. In addition, the belt 25 is connected to a small pulley 2M attached to the output shaft of the motor 24.
It is routed directly to 1a.

As is clear from FIG. 10, the belt 25 is also wound around a pair of flywheels 27 that are rotatably provided side by side on the lower surface of the chassis 3. However, the direction of rotation of the motor 24 is the direction of arrow M, which is the forward rotation direction, whereas the pulley 23 always rotates in the direction of arrow N, and the pair of flywheels 27 always rotate in the direction of arrows O and P, respectively. : Sea urchin belt 25 is being passed around.

The flywheel 27 has gear portions 27a and 27b of different sizes on its outer and inner circumferences. flywheel 2
Of the two large and small gear portions formed in 7, the smaller gear portion 27b is configured to mesh with the large diameter gear portion of the double gear 5f of the reel unit l-5 via a pair of front and rear idler gears 28. As is clear from FIGS. 2, 3, and 9, the idler gear 28 is rotatably attached to one end of a support lever 30 that is swingably provided on the chassis 3 via a shaft member 30a. It is attached to and detached from the double gear 5f of the reel unit 5 by swinging the support lever. Further, the support lever 30 is biased by a coil spring 30b in a direction in which the idler gear 28 approaches the double gear 5[.

As shown in FIGS. 2, 7, 9, and 18, a first gear 33 and a second gear 34 are rotatably attached to the rear surface of the subchassis A11 above the gears 16 to 19. It is being The first gear 33 is the gear transmission mechanism 2
0 (for example, see FIG. 7), and the second gear 34 meshes with the gear 18 of the gear transmission mechanism.

Here, the first gear 3 is connected to the gear transmission mechanism 20, the worm 22, the pulley 23, the belt 25, etc.
A rotational force applying mechanism is configured to apply rotational force from the motor 24 as a single drive source to the third and second gears 34. Further, the rotational force applying mechanism and the motor 24 constitute a rotational force applying mechanism that rotationally drives the first gear 33 and the second gear 34.

The first gear 33 is for reciprocating a head stand, which will be described later. First, a structure for connecting the first gear and the head stand will be described.

For example, as shown in FIGS. 7 and 18, a pin 33a is protruded from the rear surface of the first gear 33, and the first gear 33 is attached to the pin in the direction shown in FIG. One end of a coil spring 35 is hung. The other end of the coil spring 35 is hung on a plate 36 fixed to the tip of the rotation support shaft (not shown) of the gears 16 and 18.

As shown in FIGS. 2, 3, 9 and 11, a bent portion 3a extends upward in parallel with the sub-chassis A11 at the rear end of the chassis 3, that is, at the rear of the sub-chassis A11.
is formed. As shown in FIG. 4, a control plate 39 made of a rope plate is provided on the front surface of the bent portion 3a so as to be movable in the left-right direction. The leftward movement limit position of the control plate 39 is referred to as the most forward movement position of the control plate, whereas the rightward movement limit position is referred to as the most backward movement position. A coil spring 40 is provided at the right end of the control plate 39 to urge the control plate to the right, that is, in the backward movement direction.
are connected. At the upper end of the control plate 39, there is a protrusion 39 that can be engaged with the pin 33a of the first gear 33.
a is formed. The right edge of the protrusion 39a engages with the pin 33a, so that the control plate 39 is moved forward by the rotation of the first gear 33. As shown in FIGS. 2, 4, and 10, the lower part of the control plate 39 is connected to the control plate via a coil spring 41, and moves to the left as the control plate moves forward. A lever B42 is arranged to do this. A protrusion 42a is formed on the right end of the lever 842 and engages with the right edge of the protrusion 39b formed at the lower end of the control plate 39. This allows the control plate 39 to move back and forth due to the biasing force of the coil spring 40. Accordingly, the lever B42 also returns to the right. As is clear from FIGS. 2, 8, and 10, the left end of the lever 84.2 is provided on the lower surface of the chassis 3 so as to extend back and forth, and is connected to its center via the pin 44a. The lever C44 is pivotally attached to the rear end of a lever C44 rotatably attached to the chassis 3. This lever C44
The front end portion of is pivotally attached to a head stand 47 provided on the chassis 3 so as to be able to reciprocate in the left-right direction. Note that the magnetic tape is driven in the front-rear direction, and therefore, the moving direction of the head stand 47 is approximately perpendicular to the tape transport direction.

The above-mentioned first gear 33, control plate 39, coil spring 40, 41, lever B42, and lever C4I71
A head stand driving mechanism for driving the head stand 47 is constituted by these and related peripheral small members.

Next, the second gear 34 and its related members will be explained. The second gear 34 is for rotating the magnetic head 49 provided on the head stand 47, and is disposed at a position farther from the head stand 47 than the first gear 33. Moreover, the rotation ratio of the first gear 33 and the second gear 34 is 1:1.

As is clear from FIGS. 7 and 18, the second gear 34
Two stop bins 3/Ia and 34b are provided protruding from the rear surface with a pitch of 180°, and one stop bin 34a is attached to the second gear so that it also protrudes from the front face of the second gear. is paying tribute. In addition, both stop pins 34
a and 34b can be engaged with the right edge of a protrusion 390 protruding from the upper end of the rear end of the control plate 39. That is, the control board 39
can also be moved forward by both stop bins.

Further, a claw member 51a and a spring member 51b are provided near the second gear 34, and the second gear 34 is biased clockwise in FIG. 18 by the claw member and the spring member. As shown in FIG. 18, a movable plate 52 made of a steel plate is mounted on the rear surface of the sub-chassis so as to be able to reciprocate in the left-right direction. Claws 52a and 52b are formed at the right end of the moving plate 52 and can be engaged with the stop pin 34a protruding from the front surface of the second gear 34. The claw portion 52a engages with the stop bin 34a at its right edge, and the claw portion 52b engages with the stop bin 34a at its left edge. That is, the movable plate 52 reciprocates as the second gear 34 rotates 180° in one direction.

As shown in FIG. 2, FIG. 3, and FIG. 9, a lever D53 formed in a substantially dogleg shape is disposed near the left end of the moving plate 52, and the lever D53 has a central bent portion. It is rotatably attached to the upper surface of the chassis 3. Further, the lever D53 is click-biased by a spring 54 (see FIG. 3). The left end of the moving plate 52 is pivotally attached to the rear end of this lever D53. Further, the front end of the lever D53 is pivotally connected to the rear end of a slide member 56 (also shown in FIG. 5) provided on the head stand 47 so as to be able to reciprocate in the front-rear direction.

As shown in FIGS. 2, 5, and 9, the magnetic head 49 is placed to the right of the slide member 56. As shown in FIGS. The magnetic head 49 has a bearing member 5 fixed on the head stand 47.
7, it is supported rotatably about an axis parallel to the moving direction of the head stand 47, that is, about an axis perpendicular to the magnetic tape contact surface of the magnetic head. The rotating shaft portion of the magnetic head 49 is made of a die-cast alloy, whereas the material of the bearing member 57 that fits into the rotating shaft portion is PPS resin containing glass m fibers.

The square claw position of the magnetic head 49 shown in FIG. 5 will be referred to as the first angular position of the magnetic head, and the position rotated by 180 degrees from the first angular position will be referred to as the second angular position of the magnetic head. to be called. The magnetic head 49 is located between the first angular position and the second angular position.
It is rotatable between angular positions.

A fan-shaped gear 59 is disposed at a position sandwiching the slide member 56 together with the bearing portion 57, and is rotatably attached to the front end of the bearing member 57 at the main portion of the fan. However, so that the joint between the fan-shaped gear 59 and the bearing member 57 does not hinder the reciprocating movement of the slide member 56,
The slide member 56 is provided with an elongated hole 56a extending in the front-rear direction and into which the coupling portion is loosely fitted. In addition, fan-shaped gear 5
9 is click-biased by a spring 60. A pin 59a is provided protruding from the right end surface of the fan-shaped gear 59, and the pin 59a is pivotally attached to the slide member 56.

That is, the fan-shaped gear 59 swings as the slide member 56 reciprocates. The gear portion of the fan-shaped gear 59 is meshed with a gear 61 coaxially fixed to the rotating shaft portion of the magnetic head 490.

The second gear 34, the moving plate 52, the lever D53, the spring 54, the slide member 56, the bearing member 57, the sector gear 59, and the coil spring 60.
A head rotation mechanism for rotationally driving the magnetic head 49 is constituted by the gear 61 and related small peripheral members. Further, the head rotation mechanism and the above-described head stand drive mechanism are collectively referred to as a control mechanism.

That is, the head stand 47 is reciprocated by the mm control mechanism, and the magnetic head 49 is rotated. As understood from the above explanation, the head stand 4 rotates by 360° when the first gear 33 rotates.
7 performs forward and backward movement, and the second gear 34
The magnetic head 49 rotates 180 degrees, causing the magnetic head 49 to rotate 180 degrees.
It is designed to rotate by 0°.

Here, the azimuth adjustment means for regulating the angle of the magnetic head 490 will be explained.

For example, as shown in FIGS. 5 and 9, the head stand 4
A regulating member 64 extending in the front-rear direction is fixed on the magnetic head 7 so as to surround the four magnetic heads.

The regulating member 64 is made of a steel plate and has flexibility. The regulating member 64 is formed symmetrically in the front-rear direction, and is fixed to the head stand 47 at its center portion, and both front and rear ends extending in directions away from each other centering on the center portion support the magnetic head 49. It can be engaged with the outer periphery of. More specifically, both the front and rear ends of the regulating member 64 are located at a position that sandwiches the four magnetic heads from the front and back, and one of the two ends is bent in a U-shape. A protrusion 49 whose lower side protrudes from the outer periphery of the magnetic head 49
By engaging with a, rotation of the magnetic head 49 is restricted.

Incidentally, an opening 64a h< is provided on the upper surface of the regulating member 64 so that the protrusion/1.9 a of the magnetic head does not come into contact with the regulating member 64 when the magnetic head 49 rotates. A head stand 7I7 is provided at both front and rear ends of the regulating member 64.
A pair of screws 65 are engaged at the neck portion thereof. In addition, the lower surface of both the front and rear ends of the regulating member 64 and the head stand 4
A pair of springs 66 are interposed between the springs 7 and 7 to apply an upward bias to both the front and rear ends. (F
Only one spring 66 is shown in FIG. These screws 65 and springs 6G constitute positioning means 21 for positioning both rear ends of the regulating member 64. Further, the positioning means and the regulating member 64 constitute an azimuth adjusting means.

In other words, by tightening or loosening the pair of screws 65, the two angular positions of the magnetic head 49 can be adjusted individually.

Note that the same effect can be obtained by dividing the regulating member 64 at its center into two members and fixing each member in a cantilever shape to the head stand 47 directly above the magnetic head 49. It will be done. However, by forming the above-mentioned regulating member into a single member having a front-back symmetrical shape, the number of parts is reduced and the number of assembly steps is also reduced, contributing to cost reduction.

The story goes back and forth, but for example, as shown in FIG. 18, the first gear 33 is provided with two missing tooth portions 33c and 33d symmetrically with respect to a partial tooth portion 33b having approximately three teeth. . When the first gear 33 is in a stationary state, the toothless portion 330 corresponds to the gear 16 (a part of the gear transmission mechanism 20), and the partial tooth portion 33 [1 is restricted from biting into gear 16. On the other hand, the second gear 34 is also formed with two toothless parts 34C and 34d with a 180° bit, and when the second gear is in a stationary state before operation, the toothless part 34c is connected to the gear 18 (gear transmission mechanism 20), and the rotation of the second gear is regulated so that the toothed portion does not get into the gear 18, as will be described later.

Next, a trigger means for causing the second gear 34 to mesh with the gear 18 after the first gear 33 meshes with the gear 16 when the first gear 33 and the second gear 34 rotate will be explained. .

As is clear from FIG. 4, at the rear end of the control plate 39,
A regulating portion 39d is formed that engages with the stop pins 34a and 34b of the second gear 34 to regulate rotation of the second gear 34 when the control plate is not at the most backward movement position (rightward movement limit position). ing.

As shown in FIGS. 2, 4, and 17, a prohibition lever 69 is disposed on the left side of the control plate 39, and its lower end is pivoted to the rear end bent portion 3a of the chassis 3. They are being investigated freely.

The prohibition lever 69 is formed with an engagement recess 69a that can be engaged with a pin 39e protruding from the front surface of the central portion of the control plate 39. In addition, the prohibition lever 69 is connected to a coil spring 70.
is biased clockwise in FIG. 17. These prohibition levers 69 and coil springs 70 prevent the control plates from moving back (movement to the right) when the three control plates move forward and reach their maximum forward movement position (leftward movement limit position). Prohibited means are configured.

On the other hand, as is particularly clear from FIG.
A protrusion 33f that can be engaged with is formed. That is, the first
When the gear 33 initially moves, the protrusion 33f of the first gear engages with the engagement protrusion 69b, causing the prohibition lever 69 to swing counterclockwise in FIG. This means that the movement-prohibited state is lifted.

The above-described inhibiting means (consisting of the inhibiting lever 69, etc.), the control plate 39, the coil spring 40 as a biasing means for biasing the control plate in the reverse direction (rightward), and the first gear 3
3 partial tooth portion 33b is the gear 16 (gear transmission 4VJ20
(= J
A coil spring 35 as a force means and a second gear 34
A claw member 51a and a spring portion tA 51a as urging means for urging the second gear in a direction in which the right tooth portion of the second gear meshes with the gear 18 (a part of the gear transmission mechanism 20), and the surroundings related thereto. The first gear 33 and the second gear 3
Trigger means is configured to cause the second gear 34 to mesh with the gear 18 after the first gear 33 meshes with the gear 16 when the gear 4 starts rotating.

As shown in FIGS. 2, 7, 9, and 18, a trident-shaped start trigger lever 73 is rotatable at the center of the front surface of the sub-chassis A11. ni tori (= l has been removed.

As is clear from FIGS. 7 and 18, the pant portion 73a of the start trigger lever 73 is bent rearward at a right angle, and the bent portion can engage with the first gear 33. More specifically, the pin 33a protruding from the rear surface of the first gear 33 penetrates through the first gear and protrudes from the front surface of the first gear by a predetermined amount, and is connected to the start trigger lever. One end 73a of the -73 is adapted to engage with this protruding portion on the front, thereby restricting the rotation of the first gear 33. The extending second end 73b is connected to the lever AI.
2 from the lower surface of the left end. That is, the second Da portion 73b of the start trigger lever 73 is engaged with the end detection lever 10 via the lever Δ12, and when the end detection lever 10 moves upward, the start trigger lever 73 is It rotates in the time direction in FIG. 18, and the rotation restriction state of the first gear 33 is released. The start trigger lever 73 has a third end 73C extending downward, and the third end engages with the left end of the magnetic head switching command rod 75 shown in FIG. The magnetic head switching command rod 75 is attached to the lower surface of the chassis 3 so as to be able to reciprocate in the left and right direction, and is made of a steel plate and is formed in an L-shape as a whole. The start trigger lever 73 is configured to rotate clockwise in FIG. 18 by moving the magnetic head switching command rod 75 to the left. In addition, the third part of the start trigger lever 73 is located near the head switching command rod 75.
A coil spring 6 is disposed at the end portion 73c to apply a rightward bias. As shown in FIGS. 2, 3, and 17, an electromagnetic solenoid 77 is provided near the motor 24. It is arranged to extend left and right, and
It is fixed on the chassis 3. A movable rod 77a of the electromagnetic solenoid 77 protrudes to the right with respect to the solenoid body, and a pin 77b extending in the vertical direction is fitted at the tip of the movable rod. The lower end of the bottle 77b is loosely fitted into a long hole 3C formed on the main surface of the chassis 3 and extending in the left-right direction, and is engaged with the right end of the n magnetic head switching command rods 75. That is, the electromagnetic solenoid 77
When the movable rod 77a is pulled, the magnetic head switching command rod 75 is moved to the left (therefore, the start trigger lever 73 is rotated clockwise in FIG. 18). Further, as shown in FIG. 1, an operation switch group 79 is arranged on the front surface of the housing 2 and to the right of the opening 2a, and one switch of the operation switch group is connected to the electromagnetic solenoid. This is a command switch for operating 77. As shown in FIG. 2, FIG. 4, FIG. 10, and FIG. 17, on the front side of the rear end bending portion 3a of the chassis 3 to which the control plate 39 is attached, there is a That is, the moving member 81 is attached so as to be movable in the left-right direction.

This moving member 81 is arranged at a position where it is sandwiched between the bending portion 3a and the control plate 39. A projection 81a is provided at the upper end of the left end of the moving member 81, and the pin 33a of the first gear 33 can engage with the right edge of the projection. That is, the moving member 81 moves to the left together with the control plate 39 as the first gear 33 rotates. A coil spring 82 is connected to the right end of the movable member 81 for imparting a rightward bias to the movable member.

As is particularly clear from FIG. 3, a T-shaped lever E83 is disposed on the right side of the moving member 81.
Further, it is rotatably attached to the rear end bent portion 3a of the chassis 3 at approximately the center thereof. A first end 83a formed on the lever 83 and extending downward is connected to the rear end of the moving member 81 via a spring 84. That is, as the moving member 81 moves to the left, the lever E83 rotates clockwise in FIG. 17. A bottle 83c extending forward is protruded from the tip of a second end 831) formed on the lever E83 and extending leftward, and the bottle is connected to a convex portion formed at the rear end of the control plate 39. 390 and the recess 39h, respectively.

When the bin 83c is engaged with the concave portion 39h, the control plate 39 can move to its most backward movement position (rightward movement limit position), and when the bin 83C is engaged with the convex portion 39a, When the control plate 39 is in the position, the return of the control plate 39 to the most backward movement position is restricted. As mentioned above, when the control plate 39 is not at the most backward movement position, the regulating portion 39d formed on the control plate engages with the stop pins 34a and 34b of the second gear 34, thereby preventing the rotation of the second gear. is regulated.

As shown in FIGS. 2, 3, 9, and 17, another electromagnetic solenoid 86 is arranged above the electromagnetic solenoid 77 in parallel with the electromagnetic solenoid, and
It is fixed on the chassis 3. This electromagnetic solenoid 8
The movable rod 86a of No. 6 protrudes leftward with respect to the solenoid main body, and a pin 86b extending in the front-rear direction is fitted at the tip of the movable rod. This bottle 86b is
a third end 8 formed on the lever E83 and extending upward;
It is pivotally attached to the tip of 3d. In addition, the movable rod 86
The pin 83c of the lever E83 engages with the protrusion 39a at the rear end of the control plate 39 when the lever E83 is in its protruding position (the position shown in FIG. 17). The electromagnetic solenoid 86 is activated by operating the key 21- of the automobile in which the cassette deck is mounted, and when the key is in the on state, the movable rod 86a of the KIN solenoid 86 moves to the left of the moving member 81. The pin 83C of the lever E83 is engaged with the rear end recess 39h of the control plate 39. When the key is turned off, the movable iron 86a is pulled out by the biasing force of the coil spring 82 which forces the moving member 81 to the right. Bin 83C of lever E83 is on control board 39
It engages with the rear end protrusion 390 of.

The movable member 81, the coil spring 82, the lever E83, the coil spring 84, the electromagnetic solenoid 86, and other related small members move the control plate 39 to the maximum return position when the power is turned off. A prohibition/cancellation means is constructed that prohibits return to the rightward movement limit position and cancels the prohibition when the power is turned on.

Next, a tape transport direction switching means for switching the transport direction of the magnetic tape will be explained.

As shown in FIGS. 2, 3, and 9, the shaft member 30a of the support lever 30 that rotatably holds the idler gear 28 is a capstan. Note that, as shown in FIG. 10, this shaft member 30a is attached to the flywheel 2.
It also serves as the pivot shaft of 7. On the other hand, as is particularly clear from FIGS. 3 and 5, there is a pair of support shafts 8 extending upward on the chassis 3 and near the capstan 30a.
9 is provided protrudingly, and a pinch roller 90 is rotatably attached to the free end of the arm member 9 on the support shaft.
1 is rotatably attached.

The pair of pinch rollers 90 are each detachable from the capstan 30a. A bottle 91a is fixed to the free end of the arm member 91 and extends vertically through the arm member, and a spring 66 (for adjusting the azimuth of the magnetic head 49) is attached to the lower end of the left edge of the bottle. For example, see FIG. 5) is engaged at one end. Arm member 91
The pinch roller 90 is urged by the spring 66 in a direction toward the capstan 30a.

The capstan 30a described above, the pinch roller 90,
The reel unit 5, the idler gear 28, and peripheral small members related thereto constitute a tape transport direction switching means that determines the tape transport direction corresponding to the two rotational angular positions of the magnetic head 49.

Each bottle 91a provided at the tip of the arm member 91
The upper ends of the slide member 56 can be engaged with the front and rear ends of the slide member 56, respectively. More specifically, two notches 56c are formed at the front and rear ends of the slide member 56, each extending in the front-rear direction and having open ends facing each other.
are provided, and either one of the pins 91a of the arm member 91 can be selectively engaged in the notch 56c as the slide member 56 reciprocates.

A tapered portion 56d is formed at the front edge of the open end of each notch 56c, and the bottle 91a is smoothly guided into the notch 56C by this tapered portion 56d.

When the pin 91a engages with the notch 56C, the arm member 91 rotates a predetermined amount U toward the left, and the pinch roller 90 is separated from the capstan 30a. That is, the pair of pinch rollers 90 are selectively detached from the capstan 30a by the reciprocating movement of the slide member 56, which is a component of the head rotation mechanism described above.

As is particularly clear from FIG. 5, mountain-shaped protrusions 47a are formed at both left and right ends of the head stand 47 that supports the slide member 56 so that the pointed portions thereof face each other. Further, on the left side of the protrusion 47a, there is a four part 47b continuous to the protrusion.
is formed.

These protrusions 47a and recesses 17b are adapted to engage with a pin 30d protruding from one swinging end of the support lever 30 shown in FIG. 3, for example, when the head stand 47 moves to the right. There is. When the mountain-shaped protrusion 47a engages with the bin 30d, the support lever 30 swings in the direction in which the idler gear 28 attached to the support lever separates from the double gear 5f of the reel unit 5, and the protrusion 47a Subsequently, when the recess 47b engages with the bin 30d, the support lever 30 returns to the position where the idler gear 28 meshes with the double gear 5f.

On the other hand, a pair of front and rear support levers 3 are also provided at both front and rear ends of the slide member 56 when the head stand 47 moves to the right.
A protrusion 56e is formed that engages with either one of the bottles 30d and prevents the bottle from entering the recess 4.7b of the head stand 47. However, each protrusion 56e is attached to a pair of bins 3 according to the forward and backward movements of the slide member 56.
0 (engages with only one of 1.J
That is, the pair of idler gears 28 are configured to be selectively moved from the reel units 1 to ll1inb by the reciprocating movement of the slide member 56, which is a part of the head rotation mechanism.

Next, 4m1tR for loading a cassette half will be explained.

As shown in FIGS. 2, 6, and 12 to 14, there is a subchassis B95 on the upper surface of the right end of the chassis 3.
is permanently installed. A swinging member A96 extending in the left-right direction is disposed on the chassis 3, and a swinging member A96 at the rear end is connected to the sub-chassis B95 and the support protrusion 3d provided at the left rear end of the chassis 3. He is being taken away freely.

A cassette holder 98 for holding a cassette half is swingably attached to the outlet end of the swinging member 96 and the front end of the cassette holder 98 for holding the cassette half. In addition,
For example, the position of the cassette holder 98 shown in FIG. 5 is referred to as the raised position of the cassette holder. The cassette half is inserted into the cullet holder 98 in this position from the direction of arrow S and held in the cassette holder. The swing member 96 swings downward by a predetermined angle from this state, and the position of the cassette holder 98 when the cassette half held by the cassette holder 98 is positioned at the playing position is changed to the lowered position of the cassette holder. It is called. The cassette holder 98 is movable between this lowered position and the above-mentioned raised position.

On the lower surface of the cassette holder 98, there is a movable member 101 which is made up of two members, an upper surface member 99 and a right surface member 100, and which can engage with the cassette half and is movable in the insertion and ejection direction of the cassette half, that is, in the front and back direction. It is being A bottle 100a is protruded from the right side of the right side member 100, and the bottle is slidably fitted into a long hole 95a formed in the sub-chassis B95 so as to extend in the front-rear direction.

On the other hand, a lever F10 is located at the center lower end of the sub-chassis 95.
2 is swingably attached at its lower end, and the upper end of the lever F is pivoted to the bottle 100a.

A coil spring 103 is connected to the lever F102, which biases the lever F in the clockwise direction as indicated by d3 in FIG. 13, and therefore applies a bias force to the movable member 101 in the cassette half ejection direction, that is, forward. Right side part 4I
A recess 100b that recesses downward is formed in the front end of the cassette holder 98, and when the right side member 100 moves rearward when the cassette half is inserted, the pivot shaft 98a of the cassette holder 98 is moved into the recess 100b. The cassette holder is moved to the lowered position. A coil spring 104 is connected to the right end of the swinging member A96 to bias the swinging member clockwise in FIG. 13. Note that as the moving member 101 moves in the cassette half insertion direction (rearward), the cassette holder 98 is urged toward the lowered position by the coil spring 103.

As is clear from FIGS. 12 and 14, the moving member 10
The upper surface member 99 of 1 is provided with a protrusion 99c that faces the reel hole 106 of the cassette half to be inserted, and a spring member 99d that biases the cassette half so that the protrusion 99c projects into the reel hole 106. There is. Note that the protrusion 99c is formed integrally with the upper surface member 99 by stamping or the like. In this way, by integrally forming the protrusion 99c on the upper surface member 99, there is no need to attach special parts to the upper surface member 99 in order to provide the protrusion, and the number of parts and the number of man-hours for attachment are reduced. Efforts are being made to reduce costs.

The upper surface member 99 is also formed with another protrusion 99e that engages with the cullet half in the vicinity of the reel hole 106. This protrusion 99e, like the above-mentioned protrusion 99C, is integrally formed on the upper surface member 99 by punching. This reduces the cost for the same reason as above. Note that the protrusion 99e engages with a recess 107 called a label area formed in the cassette half. In this way, by engaging the protrusion 99e with the recess provided in the cassette half, the state of engagement of the protrusion 99e with the saw set half becomes firm.

In the cassette deck, the cullet half is inserted into the cassette holder 98 along its longitudinal direction. Further, the aforementioned control m+i mechanism, that is, the control mechanism for reciprocating the head stand 47 and rotating the old magnetic head 49 is arranged near the deepest part of the cassette holder 98.

Next, "F operation (tape fast forward operation) and R [W operation (
The mechanism for tape rewinding operation will be explained below.

As shown in FIGS. 2, 3, 9, and 16, the left end of the chassis 3 is bent to extend upward, and this bent portion 3f has a A subchassis C111 also shown in FIG. 15 is fixed. A pair of longitudinal operating levers 113 and 114, which extend in the front-rear direction and are vertically stacked, are attached to the sub-chassis C111 so as to be able to reciprocate in the front-rear direction. The front ends of the eight longitudinal operation levers, that is, the operation ends, are separated by a predetermined distance to the left and right, and each operation end has an operation button 115, 116 (first button) provided on the front surface of the housing 2. (shown) is removed. The longitudinal operating lever 113 located at the bottom is used to perform the FF operation by its forward movement, that is, backward movement, and the longitudinal operating lever 114 located at the upper part is used to perform the forward movement. This is for performing the REW operation at the . Each of these longitudinal operation levers 11
3 and 114 are arranged above the magnetic head 719. Further, both longitudinal operation levers 113 and 114 are each given a forward bias by coil springs 118 and 119. As is particularly clear from FIGS. 7 and 15, on the left side of the rear end of the longitudinal operation levers 113 and 114, a head stand is attached to the upper end of a longitudinal bin 121 which is protruded from the left end of the upper surface of the head stand 47. Tapered portions 113a and 114a are formed that can be engaged with the knife moving to the right. That is, by pressing any of these longitudinal operation levers 113 and 114 while the head stand 7'I7 is moving to the right, the head stand 47 is moved to the left by a predetermined amount, thereby causing the magnetic The head/1.9 is separated from the magnetic tape. Further, when the head stand 47 is moved to the left by a predetermined amount by operating the longitudinal operation lever in this way, the protrusion 4.7a formed on the head stand 47 moves into the pin of the support lever 30 that holds the idler gear 28. 30d, whereby the idler gear 28 is separated from the double gear 5f of the reel unit 5 IB2. It should be noted that, although the discussion is a little off-topic, for example, as shown in FIGS. 3 and 9, a pair of claw members 123 are provided on the chassis 3 to prevent the reel unit 5 from rotating in the opposite direction. When the head stand 47 moves, the right end of the head stand 47 engages with the claw member 123 and pushes it open, thereby releasing the state in which the reel unit 5 is prevented from rotating in reverse by the claw member.

Returning to the original topic, as shown in FIG. 2, FIG. 3, and FIG. It can be moved freely in any direction. plate 12
The upper end protrusion 124a of 4 is provided with a forward bias to the plate.Coil spring 125
are connected. A T-shaped lever H126 is rotatably attached to the front end of the plate 124 at its center. In particular, as is clear from FIG. 16, on the front edge of the first end 126a formed on the lever 1-1126 and extending downward, there is a projection extending downward and protruding from the longitudinal operation lever 113 described above. The trailing edge of 113C is brought into contact. Also, lever l-1126
The rear edge of a protrusion 114C extending substantially leftward from the other longitudinal operation lever 114 is brought into contact with the front edge of the second end 126b extending in the opposite direction. There is. That is, by pressing the longitudinal operating levers 113 and 114, respectively, the lever II 126 is rotated counterclockwise and clockwise in FIG. 16.

In front of the plate 124, a lever 129 formed in a substantially doglegged shape is arranged, and the lever 129 is rotatably attached to the left bent portion 3f of the chassis 3 at its central bent portion. A bottle 129b is protruded from the tip of a first end 129a formed on the lever 1129 and extending rearward, and this bottle 129b is formed on a third end 126C formed on the lever H126 and extending forward. It is slidably fitted into the elongated hole 126d. Further, the second end 129G of the lever 129 extends downward.

As shown in FIG. 2, FIG. 3, FIG. 10, and FIG. 16, each pair of reel units 5 and flywheels 2
A swing lever 130 is disposed extending in the left-right direction at a position sandwiched between the levers 7 and 7, and is swingably attached to the chassis 3 through a bin 130a at a substantially central portion thereof. The left end of the swinging lever 130 is the second end 1 of the lever 1129.
It is pivotally attached to the tip of 29C. Also, a gear transmission mechanism 135 consisting of three gears 132, 133 and 134 meshing in series is provided on the lower surface of the right end of the swing lever 130.
is provided. The gear 132, which is the first gear of the gear transmission mechanism, is connected to each gear portion 27a of the pair of flywheels 27.
The final stage gear 134 is designed to be able to mesh with a small diameter gear portion formed on the double gear 5r of the reel unit 5. Namely. When the longitudinal operation levers 113 and 114 are pressed, the swinging lever 130 swings backward and forward via the lever lever 1126, thereby selectively moving the reel units 5 disposed at the rear and the front at high speeds. It can be rotated.

As shown in FIG. 2, FIG. 7, FIG. 15, and FIG. An intermediate lever 138 is provided which can freely reciprocate in the direction of movement of both longitudinal operation levers (back and forth). The intermediate lever 138 is provided with a coil spring 139 that applies a forward bias to the intermediate lever.
are connected. As is especially clear from Figure 15,
A bin 138a is protruded from the lower surface of the rear end of the intermediate lever 138, and the bin 138a is formed in a long hole 1 extending in the longitudinal direction in the longitudinal operation lever 113, 114 in correspondence with the bin.
4.0. A four part 140a into which a bottle 138a can be inserted is formed on the right end side of the central part of the elongated hole 140. Here, the intermediate lever 138 can swing at a predetermined angle about a support shaft 138b at its front end. In addition, the coil spring 13 that biases the intermediate lever 138 forward is stretched so as to be inclined to the right from the rear to the front. is the support shaft 13
It is also biased counterclockwise in FIG. 15 with 8b as the center. That is, both longitudinal operating levers 113.11
4 are moved forward (move backward) at the same time, the bin 138a of the intermediate lever 138 moves into the recess 14 of the elongated hole 140.
0a, so that the intermediate lever 138 moves rearward. However, if only one of the pair of longitudinal operating levers 113, 114 is moved forward, the rear right edge 140b of the elongated hole 140 formed in the other longitudinal operating lever will still be attached to the bin 13.
8a, the intermediate lever 138 is not moved forward or backward).

Although not detailed, the longitudinal operation lever 1 for FF operation
A mechanism is provided for locking either one of the longitudinal operating lever 13 and the longitudinal operating lever 114 for REW operation in the forward movement position when the longitudinal operating lever is moved forward. Further, the locking mechanism locks the longitudinal operating lever in the forward movement position when the other longitudinal operating lever is moved forward;
Also, the one longitudinal operation lever is unlocked. Further, when either of the longitudinal operating levers 113, 114 is pressed, the lever J142 provided at the rear of both longitudinal operating levers is swung in the direction of the yaw in FIG. 15, and the mute switch 143 is operated. It is made to be.

For example, as is clear from FIGS. 2 and 7, a bottle 138d is protruded from the upper surface of the rear end of the intermediate lever 138, and the bottle 138d is attached to the left end of the swinging member 96 (for example, shown in FIG. 6). 96a.

This intermediate lever 138 pushes the swinging member 96 rearward by moving forward, and moves the cassette holder 98 from the above-mentioned lowered position to the raised position.

Next, various switches provided in addition to the mute switch 143 and their arrangement will be explained.

As is clear from FIGS. 2 and 6, the subchassis B
A bracket 1/16 is attached to the right end surface of the 95, and two switches 147 and 148 are attached to the bracket.
is installed. The switch 147 is used to switch the power to the cassette deck and a tuner disposed near the cassette deck. Also,
Switch 148 is for operating motor 24. Both switches 147 and 148 are both mechanically actuated upon insertion of the cassette half into the cassette holder 98.

As shown in FIGS. 2, 7, and 18, a switch 149 for switching between FF and REW is fixed on the front surface of the left end of the sub-chassis A11. This switch 149 is operated by engagement of the moving plate 52 attached to the subchassis 8.

Further, as shown in FIG. 15, the sub-chassis 111
A switch 150 for cutting off power supply to the cassette deck is fixed on the top, and this switch operates when the intermediate lever 138 is moved forward (moved backward).

The operation of the cassette deck configured as described above will be briefly explained along the operating procedure with reference to FIGS. 19 to 26.

First, insert the cassette half 155 (shown in FIG. 19) through the opening 2a of the housing 2 shown in FIG.
The cassette half is held in a cassette holder 98 as shown in FIGS. As shown in FIG. 20, the cassette half 155 is attached to the cassette holder 98.
By being inserted inside, the right side member 100 moves rearward, thereby causing the swinging support shaft 9 of the cassette holder 98 to move.
8a falls into the recess 100b of the right side member 100, and the cassette holder is moved to the lowered position.

Therefore, the cassette half is set at the playing position.

Along with this cassette half insertion operation, the switches L47 and 148 shown in FIG.
starts rotating. When the motor 24 rotates, as shown in FIG. 10, the small pulley 24a is rotated in the direction of arrow M, the pulley 23 is rotated in the direction of arrow N, and the pair of front and rear flywheels are rotated in the directions of arrows O and P, respectively. . Therefore, the pair of reel units 5 start rotating in the directions of arrows Q and R (as shown in the 10th figure) through the pair of idler gears 28, respectively. In this way, since the pair of reel units 5 rotate in opposite directions, slack in the magnetic tape in the cassette half 155 is wound up.

When the slack in the magnetic tape is wound up and a predetermined tension is applied to the magnetic tape, all of the components of the reel unit 5 shown in FIG. 11 except for the double gear 5f react to the tension. It is fixed by force, and only the double gear 5f continues to idle with respect to the group of fixed members via the felt plate 5h. Therefore, the magnetic tape is not transported with the above tension applied to it.

On the other hand, the end detection gear 14 shown in FIGS. 7 and 18, for example, is activated by the rotation of the motor 24, and
0 in the counterclockwise direction as shown in FIG. Therefore, as the end detection gear 140 rotates, the bottle 10b protruding from the end detection lever 10 moves to the end detection gear's mountain-like protrusion 1/1. is moved to the top of b. Here, as is clear from the above, the arm 51 of each reel unit 5 is stopped. Therefore, the intermediate lever 7 is not activated, and the bin 10b of the end detection lever 10 does not continue sliding along the mountain-like protrusion 14b. Therefore, the bottle 10b of the end detection lever 10 has a mountain-shaped protrusion 14. b, and thereby the protrusion 14G of the end detection gear 14 engages with the bin 10b.

Therefore, the end detection lever 10 moves upward, and the start trigger lever 73 is rotated in the direction shown in FIG. 18 via the lever Δ12. Since the pin 33a was engaged with one end of the start trigger lever 73, the first gear 33, whose rotation had been restricted, became rotatable, and the biasing force of the fill spring 35 enabled the first gear 33 to rotate. It can be rotated clockwise as shown in the figure. Therefore, the partial tooth portion 33h of the first WJ wheel 33 meshes with the gear 16, and the first gear begins to rotate. The rotation of the first gear 33 causes the control plate 39 shown in FIG. 17 to move to the left, and therefore the head stand 47 moves to the right as shown in FIG. comes into contact with. When the control plate 39 reaches the maximum forward movement position (leftward movement limit position), the control plate 39 is stopped in its backward movement by engaging the engagement recess 69a of the prohibition lever 69 with the pin 39e protruding from the control plate. (movement to the right) is prohibited. As the first gear 33 rotates, the moving member 81 shown in FIG. 17 is also moved to the left as shown in FIG. 23. Therefore,
The lever E83 rotates in the clockwise direction as shown in FIG. 23, and the movable rod 86a of the electromagnetic solenoid 86, which is already in the on state, is pushed in. This action causes
The pin 83c of the lever E83 comes to engage with the recess 39h formed at the right end of the control plate 39, and therefore the control plate 39 can be moved to the most backward movement position (rightward movement limit position). . Also, the engagement recess 69a of the prohibition lever 69
When the pin 39e of the control plate 39 enters the lock, the prohibition lever 69 is rotated by a predetermined amount clockwise as shown in FIG. 23, and the upper end of the prohibition lever is turned on via the lever J142 (see FIG. The mute switch 143, which had been in the off state, is now in the off state.

On the other hand, as shown in FIG. 22, by moving the head stand 47 to the right, the front idler gear is separated from the double gear 5f of the front reel unit 5, and only the rear reel unit 5 is rotated. Become. Note that this operation is performed by the protrusion 47a and recess 4.7b formed on the head stand 47, and the protrusion 5 provided on the slide member 56.
This depends on the interaction with 6e, but since it was explained in detail in the previous explanation of the configuration, it will not be explained in detail here. Further, as shown in FIG. 22, as the head stand 47 moves to the right, the rear pinch roller 90 comes into contact with the capstan 30a, and the front pinch roller 90 corresponds to this. 1112 L from the capstan. This is because the bin 91a protruding from the arm member 91 supporting the front pinch roller 90 is attached to the slide member 56.
This is because it is fitted into the notch 56c. As also shown in FIG. 22, as the head stand 47 moves to the right, the pair of claw members 1 that were engaged with the reel unit 5 are removed.
23 is drawn from the reel unit.

In this way, tape transport to the FWD side is started, and reproduction on the FWD side is performed.

Next, the operation of switching from FWD-side playback to REV-side playback will be described.

When the switch for switching the tape transport direction is pressed, the electromagnetic solenoid 77 is turned on, and the movable long door 7a of the NI & solenoid is pulled. Therefore, the start trigger lever is activated via the magnetic head switching command rod 75.
73 rotates clockwise in FIG. As a result, the first gear 33, whose rotation was restricted by the start trigger lever, becomes rotatable, and is rotated clockwise in FIG. 18 by the biasing force of the coil spring 35. Therefore, the first gear 330 partial tooth portion 33
b meshes with gear 16, and the first gear begins to rotate. Immediately after the first gear 33 starts rotating, the protrusion 33f protruding from the first gear engages with the engagement protrusion 691 of the prohibition lever 69 (see FIG. Rotate it in the counterclockwise direction as shown in the figure. Then, the engaging recess 69a of the prohibition lever and the control plate 39 are disengaged from the pin 390, and the control plate 39 is instantaneously moved to its most backward position by the biasing force of the coil spring 40 (rightward movement limit position). was forced to return to When the control board 39 returns to the maximum return position, the head stand 47 moves to the left, and the magnetic head 49 is separated from the magnetic tape.

When the control plate 39 is at the maximum tf movement position (leftward movement limit position), the regulating portions 39, d (
For example, a stop pin 34a (as shown in FIG. 4) is engaged with the second gear 34, and rotation of the second gear 34 is restricted. Control board 3
This restriction is released by the return of 9 to the above-mentioned most backward movement 4C1 position, and the second gear 34 is moved to the 18th
It is rotated in the clockwise direction d3 in the figure. Therefore, the right tooth portion of the second gear 3/1 meshes with the gear 18, and the second gear begins to rotate. As the second gear 34 rotates, the stop pin 34a protruding from the second gear engages with the claw portion 52a of the movable plate 52, and the movable plate is moved to the left and connected to the movable plate. magnetic head 49
is rotated 180° to the REV side. Further, by moving the moving plate 52 leftward, the switch 149 is switched from the FWD side to the REV side.

Due to the above rotation of the second gear 34, the stop bin 34a of the second gear engages with a protrusion 39C (see FIG. 17, etc.) formed on the control plate 39, and the control plate is moved a predetermined distance by the stop bin. (The second gear 34 is moved to the left. When the second gear 34 completes 180° rotation, the stop bin 34
a is detached from the protrusion 39C of the control plate 39, and then the pin 33a of the first gear 33 is removed from the control plate 39.
The control plate 39 is moved to the forward movement position (the leftward movement limit position) and is locked by the prohibition lever 69 as described above.

As the control plate 39 moves forward, the head stand 47 moves to the right again, and the magnetic head 49 comes into contact with the magnetic tape. Further, the switches 1 to 143 are also in the A-off state as described above.

Further, the slide member 56 is moved forward by the leftward movement of the moving plate 52, and as a result, the head stand 47 is moved rightward, the rear idler gear 28 is separated from the reel unit 5, and the front idler gear 2
8 is engaged with the reel unit 5, and only the front reel unit 5 starts rotating. Further, the front pinch roller 90 is brought into contact with the capstan 30a, and the rear pinch roller 90 is held separated from the capstan 30a.

In this way, the tape transport direction is switched from the FWD side to the REV side.In addition, regarding the operation of switching the tape transport direction from the REV side to the FWD side,
．． This operation is substantially the same as the tape transport direction switching operation from the FWD side to the REV side, except that b engages with the claw portion 5211 (shown in Figure 18) of the moving plate 52 to move the moving plate to the right. , not detailed.

Next, the operation of the mechanism that automatically switches the tape transport direction will be explained.

For example, when tape transport to the FWD side is completed, a predetermined tension is applied to the magnetic tape at the end, and all the components of the reel unit 5 shown in FIG. 11 except the double gear 5f are applied. The shape is fixed by the reaction force of the tension. Therefore, only the double gear 5f continues to idle with respect to these fixed members via the felt plate 5h. When the tape is being transported to the FWD side, the fixed members are also rotating except for the arm member 51. Further, the arm member 51 receives a biasing force caused by the rotational force, and moves the intermediate lever 7 via the floating lever 8 to the second position.
The force is applied in the counterclockwise direction in Figure 2. As a result, the end detection lever 10 to which the rear end of the intermediate lever is pivoted is urged to rotate in the counterclockwise direction in FIG.
The bottle 10b protruding from the end detection lever is connected to the mountain-shaped protrusion 14 of the end detection gear 14. b, and the end detection gear protrusion 14c and the bottle 10b do not engage with each other. However, when the reel unit 5, excluding the double gear 5f, becomes fixed when the tape stops, the force that urges the end detection lever 10 also disappears.
The protrusion 14C of the end detection gear 14 engages with the pin 10b of the end detection lever. Therefore, one end detection tube
10 moves upward, and the start trigger lever 73 is rotated clockwise in FIG. 18 via the lever A12. The following describes the operation of switching the tape transport direction from the FWD side to the REV side by pressing the switch mentioned above. The automatic switching of the transport direction is performed in the same manner as described above, and will not be described in detail.

Next, FF operation (tape fast forward operation) and REW operation (
(tape rewinding operation) will be explained.

For example, when performing FF operation during tape playback, as shown in FIGS. 24 and 25,
Press 13 to move it backwards.

Then, the mute switch 14 is activated via the lever J142.
3 is turned on. Further, the longitudinal bin 121 protruding from the left end of the head stand 47 is pushed to the left by the tapered portion 113a of the longitudinal operation lever 113, and as a result, the head stand 47 is moved to the left by a predetermined amount. The contact between the magnetic head 49 and the magnetic tape is loosened.

As is clear from FIG. 25, the backward movement of the longitudinal operating lever 113 causes the lever H126 that engages with the protrusion 113C of the longitudinal operating lever to swing counterclockwise in FIG. 25. Therefore, the lever 1129 similarly swings clockwise in FIG. 25, thereby causing the second
As shown in FIG. 6, the swinging lever 130 is
Rotate in the counterclockwise direction as shown in FIG. 26 around .

Therefore, the gear transmission 11 horizontal 1 provided on the swing lever
The first stage gear 132 of No. 35 meshes with the gear portion 27a of the rear flywheel 27, and the final stage gear 134 meshes with the small diameter gear portion of the double gear 5f of the rear reel unit 5. On the other hand, by moving the head stand 47 to the left by pushing the longitudinal operation lever 113, the pair of idler gears 2
8 has been removed from the reel unit 5. Therefore, the rear reel unit 5 rotates at high speed, and the tape is rapidly forwarded.

When performing a REW operation, this is done by pushing the longitudinal operating lever 114 for REW operation. Zunawachi,
The protrusion 114C of the longitudinal operation lever 114 is the lever H126.
The lever lever 1 is rotated clockwise in FIG. 25, and the first gear 132 is rotated clockwise in FIG.
and the final stage gear 134 are respectively the front flywheel 27
and meshes with the reel unit. Note that the leftward movement of the head stand 47 is performed using the tapered portion 1 of the longitudinal operation lever 114.
14a engages with a longitudinal bin 121 provided on the head stand 47.

When the tape reproduction is finished and the cassette half is to be ejected, the longitudinal operating lever 113 for FF operation and the longitudinal operating lever 114 for REW operation may be pushed simultaneously. Part 2
By simultaneously pressing the longitudinal operating levers of the book, the intermediate lever 138 (for example, shown in FIG. ). Thus, the exact opposite action when loading the cassette half 155 causes the cassette half to be projected into a position for retrieval by the listener. In addition, for example, since the switch 150 shown in FIG. 24 also operates, the electromagnetic solenoid 86 (the 23rd
(see figure) is turned off, and the lever E83 is returned to the state shown in FIG. 17 by the action of the coil spring 82. Therefore, the pin 830 provided on the lever E83 can engage with the convex portion 390 formed on the right end portion of the control plate 39. As a result, the return of the control plate 39 to the most backward movement position (rightward movement limit position) is prohibited.

That is, the stop pin 34a of the second gear 34 is kept engaged with the regulating portion 39d of the control plate 39, and the first 62=2 gear 34 cannot rotate when the power is turned on again. This prevents the tape transport direction from being switched unnecessarily.

Incidentally, the operation of turning off the electromagnetic solenoid 86 by the above-mentioned IC is also performed when the key of the automobile in which the cassette deck is mounted is turned off.

Effects of the Invention As detailed above, in the cassette deck according to the present invention, each of the pair of pinch rollers (90) detachably provided to the capstan (30a) rotates the magnetic head (49). The capstan can be alternatively removed from the capstan by a head rotation mechanism. Further, an idler gear (28) is detachably provided to each of the pair of reel units (5) to be engaged with the cassette reel, and is configured to transmit rotational driving force from a drive source to the reel unit. The rotation mechanism selectively moves lIl[ from the reel unit.
1llJ. Therefore, compared to a cassette deck in which a mechanism for rotating the magnetic head and a mechanism for attaching and detaching the pinch roller and idler gear are separately provided, it is easier to reduce the size and cost of the cassette deck as a whole. It is.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a cassette deck according to the present invention, FIG. 2 is an exploded perspective view of the internal structure of the cassette deck, and FIGS. 3 to 8 are partial detailed perspective views of the internal structure.
9 and 10 are respectively a plan view and a rear view of the internal structure, FIGS. 11 to 18 are diagrams showing details of the internal structure, and FIGS. 19 to 26 are diagrams showing the operation of the cassette deck. It is a figure for explaining. Explanation of symbols of main parts 1...Cassette deck 2...Housing 2a...Opening 3...
- Chassis 3a, 3f...Bending portions 3c, 5m, 56a, 95a, 126d. 140...Elongated hole 3d...Support protrusion 5...Reel unit 5a...Rotation shaft 5b...
Reel 5C...Color 5d...
Bush 5e... Expanded diameter part 5f...
Double gear 5g, 5Q, 30b, 35. 40.
41°60, 70. 76.82.84. 103°104, 118. 119. 125. 139...
... Coil spring 5h ... Felt plate 51 ... Arm 5j, 5k ... Washer 7 ... Intermediate lever 7a, 8a, 8b, 10b, 30d, 33a. 39e, 44a, 77b, 83c, 86b. 91a, 100a, 129b, 130a. 138 a, 138 d... Bin 7b, 64
a...Opening portion 7c, 56G...Notch portion 8...Idle lever 10...End detection lever 10a, 14c, 33f, 39a, 39b. 39c, 42a, 47a, 49a, 56e. 81a, 99c, 99e, 113c. 114C...Protrusion 11...Sub-chassis A 12...Lever A 14...End detection gears 14a, 39h, 47b, 100b. 140a...Protrusion 14b...Protrusion 16.17.18.19.61, 132°133.13
4...Gear 20.135...Gear transmission mechanism 22...
・Worm 23...Pulley 24...
・Motor 24a...Small pulley 25...
... Belt 27 ... Flywheel 2
7a, 27b...Gear portion 28...Idler gear 30...Support lever 30a...Capstan 33...
...First gear 33b... Partial tooth portions 33c, 33d, 34c, 34d... Missing tooth portion 3
4...Second gears 34a, 34. b... Stop pin 36.12
4... Plate 39... Control board 39d...
Regulation part 39g... Convex part 42...
...Lever B44...Lever C71,7...
...Head stand 49...Magnetic head 518.123...Claw members 51b, 99d...Spring member 52...Movement plates 52a, 52b... ...Claw portion 53...Lever D 54.66...Spring 56...Slide member 56d, 113a, 114a----7 One part 5
7... Bearing member 59... Fan-shaped gear 64... Regulation member 65... Screw 69... Prohibition lever 69a...・
Engagement recess 69b...Engagement protrusion 73...Start trigger lever 73a...
...One end portion 73b, 83b, 126b, 129c...
...Second end 75...Magnetic head switching command Ron door 7.86
......Electromagnetic solenoids 77a, 86a...
・Movable rod 79... Operation switch group 81.
...Moving member 83...Lever E 83a, 126a, 129a...First end 89
．． 138b... Support shaft 90... Pinch roller 91... Arm member 95... Subchassis B 96... Rocking member 96a... ...
Left end portion 98...Cassette holder 98a...
... Swing shaft 99 ... Top member 10
0... Right side member 101... Moving member
102... Lever F106...
Reel hole 107... recess 111...
...Sub-chassis C 113,114...;Longitudinal operation lever 115.1
16...Operation button 121...Longitudinal bottle 124a...Top protrusion 126...
...Lever 1-1 129...Lever 113
0... Swinging lever 138... Intermediate lever 140b... Rear right edge 142... Levy J 143... Mikoto switch 146... ····bracket

Claims (2)

[Claims] (1) A magnetic head rotatably supported around an axis substantially perpendicular to the magnetic tape contact surface, a head rotation mechanism for rotating the magnetic head, and a capstan, each of which is removably attached to the capstan. including a pair of pinch rollers;
A cassette deck, wherein the pinch roller is selectively removed from the capstan by the head rotation mechanism. (2) A magnetic head rotatably supported around an axis substantially perpendicular to the magnetic tape contact surface, a head rotation mechanism for rotating the magnetic head, and a capstan, each of which is removably attached to the capstan. The pinch roller includes a pair of pinch rollers, and an idler gear that is detachably provided to each of the pair of reel units to be engaged with the cassette reel and transmits rotational driving force from a drive source to the reel unit. A cassette deck characterized in that a roller and an idler gear are selectively detached from the capstan and reel unit, respectively, by the head rotation mechanism.