JPS6182310A - Cassette deck - Google Patents

Abstract

PURPOSE:To prevent the damage of a magnetic tape and the occurrence of noise by providing a trigger means by which a magnetic head is rotated after the magnetic head is separated completely from the magnetic tape. CONSTITUTION:When a start trigger lever 73 is turned clockwise, a gear 33 can be turned and is turned clockwise. A partial tooth part 33b of the gear 33 is engaged with a gear 16 and the gear 33 starts rotting. A projection 33f is engaged with a projection of an inhibiting lever to turn the inhibiting lever. Then, a control plate is returned momently. Thus, a head base is moved to separate the magnetic head from the magnetic tape. When the control plate is returned, the control of turning of a gear 34 is released, and the gear 34 is turned clockwise. A tooth part of the gear 34 is engaged with a gear 18, and the gear 34 starts rotating. By this rotation of the gear 34, a stop in 34a is engaged with a claw part 52a of a moving plate 52 to move the plate 52, and the magnetic head is rotated at 180 deg..

Description

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

11 [[ Cassette decks have been becoming increasingly smaller in recent years, and in particular, there is a strong demand for smaller cassette decks, as there is a limit to the space in which the cassette decks can be accommodated.

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,
The auto-reverse mechanism automatically reverses the magnetic tape and sets the magnetic head to match the tracks in both forward and reverse directions.

Various configurations for switching the magnetic head forward and backward have already been proposed. For example, when playing a four-track magnetic tape, four channels of magnetic heads are provided and two of the four channels are switched between forward and reverse running of the magnetic tape. There is a type in which the tape is switched electrically, and a type in which a two-channel magnetic head is provided 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 these various magnetic head switching formats, the magnetic head A format in which the image is rotated is adopted.

In the magnetic head rotation type, the magnetic head is once moved in a direction substantially perpendicular to the tape transport direction to separate the magnetic head from the magnetic tape, and then rotated, and then the magnetic head is moved back to remove the magnetic tape. Abutment is performed.

The already developed cassette deck has a drive source for rotating the magnetic head, and a drive source provided separately from the drive source for reciprocating the magnetic head in a direction substantially perpendicular to the tape transport direction. At least two driving sources were provided. Therefore, it has been a problem to reduce the size and cost of the entire cassette deck.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and its object is to provide a cassette deck that is easy to downsize as a whole and is inexpensive.

The cassette deck according to the present invention includes a head stand that can freely reciprocate in a direction substantially perpendicular to the tape transport direction, and a head stand that is placed on the head stand between two angular positions about an axis that is substantially parallel to the moving direction of the head stand. a magnetic head that is rotatably provided; a tape transport direction switching means that determines a tape transport direction corresponding to the angular position of the magnetic head; and a first gear that reciprocates the head stand by rotation. a head rotation mechanism including a table drive mechanism, a second gear that rotates the magnetic head by rotation;
the first and second gears including a gear transmission mechanism that can mesh with the gears;
a rotation force "Im" that applies rotational force from a single drive source to the gear, and the second gear meshes with the gear transmission mechanism after the first gear meshes with the gear transmission mechanism. It is characterized by being provided with trigger means.

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 direction of arrow X is to the left, and the direction of arrow 2 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 bevel 5b is rotatably fitted onto the rotary 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 cassette reel which is housed in the cassette half and is wound with magnetic tape. 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. and,
It is rotatably attached to the rotation support shaft 5a.

A coil spring 5g is interposed between the double gear 5f and the bush 5d to bias the double gear and the bush away from each other. 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 part 5e, and the double gear 5f
is slidably abutted against. 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 and upper surfaces of the arm 51 are slidably engaged with the enlarged diameter portion 5e and collar 50 of the reel 5b via washers 5j and 5k, and there is a gap between the upper washer 5 and the arm 51. A coil spring 59 is arranged 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. It is attached to 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 bin 8a protruding from the center of a floating lever 8 movably provided on the chassis 3 is inserted into the opening 7b. It is loosely fitted.

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. The end detection lever 10 is connected to a sub-chassis A1 which is fixed to the upper surface of the rear end of the chassis 3 and protrudes 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 upper end of the end detection lever 10, and the bin is rotatably attached to the subchassis A. 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, a four part 14a is formed on the surface of the end detection gear 14 facing the end detection lever 10, and a four part 14a is formed on the circumferential surface of the concave part, and a part protrudes in the radial direction of the end detection lever. Three substantially mountain-shaped protrusions 14b having the same shape are provided at a pitch of 120°. Moreover, three protrusions 14c of the same shape are formed in the center of the recess 14a and extend radially toward the valleys between the above-mentioned mountain-like protrusions 14b. A circle circumscribing the top of each protrusion 14b and each protrusion 14c
If a circle is placed inside the top of the circle, the diameters of these circles are approximately the same. The bottle 10b protrudingly provided on the end detection lever 10 can engage with these protrusions 14b and 14c.

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 is the final stage gear 1 of the gear transmission ms.
It meshes with 9. As shown in FIG. 18, the first stage gear 16 of the gear transmission mechanism 20 (however, the reference numeral 20 is not shown in FIG. 18) meshes with a worm 22 rotatably attached to the subchassis A11. are doing. A pulley 23 is integrally formed at the lower end of the worm 22. As shown in FIG. 10, the pulley 23 is rotationally driven via a belt 25 by a motor 24 located at the right rear end of the chassis 3. As shown in FIG. Note that the belt 25 is directly wound around a small pulley 24a fitted to the output shaft of the motor 24.

As is clear from FIG. 10, the belt 25 is also passed around a pair of flywheels 27 that are rotatably provided on the lower surface of the chassis 3 and arranged one behind the other. However, the direction of rotation of the motor 24 is in the direction of arrow M, which is the forward rotation direction, whereas the pulley 23 is always rotated in the direction of arrow N, and the pair of flywheels 27 are always rotated in the direction of arrows O and P, respectively. A belt 25 is passed around the belt.

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 the reel unit 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 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 installed on the chassis 3 via a shaft member 30a. The support lever 30 is attached to the double gear 5f of the reel unit 5 by swinging so that the idler gear 28 It is biased in the direction approaching the double gear 5f.

As shown in FIG. 2, FIG. 7, FIG. 9, and FIG. 18, a first gear 33 and a second gear 34 are rotatably mounted on the rear surface of the first nub chassis △11 above the gear 16. installed. The first gear 33 meshes with the gear 16 of the gear transmission mechanism 20 (see FIG. 7, for example),
The second gear 34 meshes with the gear 18 of the gear transmission mechanism.

Here, the motor 2 as a single drive source is connected to the first gear 33 and the second gear 34 by the gear transmission tf420, the arm 22, the pulley 23, the belt 25, etc.
A rotational force applying mechanism that applies rotational force from 4 is configured. Further, the rotational force applying mechanism and the motor 24 constitute a rotational force applying means 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 pin 33a urges the first gear 33 clockwise in FIG. One end of a coil spring 35 is hung. The coil spring 35 is attached to a plate 36 fixed to the tips of rotational shafts (not shown) of the gears 16 and 18.
! The ends are hung.

As shown in FIGS. 2, 3, 9, and 11, a bent portion 3a extends upward parallel to 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 attached to the front surface of the bent portion 3a so as to be movable in the left-right direction.The control plate 39
The movement limit position in the left direction is called the most forward movement position of the control plate, whereas the movement limit position in the right direction is called the most backward movement position. A coil spring 4 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.
0 is concatenated. Approximately in the center of the three control plates and at the upper end is a protrusion 3 that can be engaged with the pin 33a of the first gear 33.
9a is formed. The projection 39a engages with the bin 33a at its right edge, and therefore the control plate 39
is caused to move forward by the rotation of the first gear 33. As shown in FIGS. 2, 4 and 10,
Below the three control plates are the control plates and a coil spring 41.
A lever B42 is disposed that is connected to the control plate via the control plate and moves to the left as the control plate moves forward. A protrusion 42a is formed at the right end of the lever B42 and engages with the right edge of the protrusion 39b formed at the lower end of the three control plates.
As the lever B42 moves back, the lever B42 also returns to the right. As is clear from FIGS. 2, 8, and 10, the left end of the lever B42 is provided on the lower surface of the chassis 3 so as to extend back and forth, and is rotatable at its center via the bin 44a. The lever C44 is pivotally attached to the rear end of the lever C44, which is attached to the chassis 3.
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 driving direction of the magnetic tape is the front-back direction, so -
1/I- The moving direction of the head stand 47 is approximately perpendicular to the tape transport direction.

The above-described first gear 33, control plate 39, coil spring 40, 41, lever 842, lever C44,
The head stand 47 and the peripheral small members related to these
A head stand drive mechanism is configured to drive the head stand.

Next, the second gear 34 and its related members will be explained. The second gear 34 is for rotating the four magnetic heads provided on the head stand 47, and is arranged 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 34a and 34b are protruded from the rear surface with a pitch of 180°, and one stop bin 34a passes through the second gear so that it also protrudes from the front face of the second gear. are doing. In addition, both stop bins 34a
, 34b is a protrusion 3 protruding from the upper end of the rear end of the control plate 39.
9c can be engaged with the right edge. That is, the control plate 39 can also be moved forward by the two 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 rope plate is attached to 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 the stop bin 34a at its right edge, and the claw portion 52b engages the stop bin 34a at its left edge. It is designed to engage with a. 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 die-cast alloy, whereas the material of the bearing member 57 that fits into the rotating shaft portion is PPS resin containing glass mta.

=17= Note that the angular position of the magnetic head 49 shown in FIG. 5 is referred to as the first angular position of the magnetic head, and the position rotated 180 degrees from the first angular position is referred to as the second angular position of the magnetic head. It is called position. The four magnetic heads are located at the first angular position and at 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 member 57, and is rotatably attached to the front end of the bearing member 57 at a 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 coil spring 60. A bottle 59a is provided protruding from the right end surface of the fan-shaped gear 59, and the bottle 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 =18- A gear 61 coaxially fixed to the rotating shaft portion of the magnetic head 49
It is interlocked with.

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 and the magnetic head 49 is rotated by the control mechanism. As understood from the above explanation, the first gear 33 rotates 360 degrees, causing the head stand 4 to rotate.
7 performs forward and backward movement, and the second gear 31
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 angular surface of the magnetic head 49 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 magnetic head 49 .

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 around the center portion serve as the magnetic head 49. It can be engaged with the outer periphery of. More specifically, both front and rear ends of the regulating member 64 are positioned so as to sandwich the magnetic head 49 from the front and back, and both ends are bent into a U-shape, with the lower side of the U-shape being magnetically A protrusion 49a protruding from the outer periphery of the head 49
By engaging with the magnetic head 49, rotation of the magnetic head 49 is restricted.

Note that, when the magnetic head 49 rotates, a protrusion 4-9a of the magnetic head is formed on the upper surface of the regulating member 64.
The opening 64a is provided so as not to hit the opening 64a. A pair of screws 65 screwed into the head stand 47 are engaged at both front and rear ends of the regulating member 64 at their necks. Further, a pair of springs 66 are interposed between the lower surface of the front and rear ends of the regulating member 64 and the head stand 47 to apply an upward bias to the front and rear ends. However, only one spring 66 is shown in FIG. These screws 65 and springs 66 constitute positioning means for positioning both the front and rear ends of the regulating member 64. Further, the positioning means and the regulating member 64 constitute an azimuth adjusting means. That is, by tightening or loosening the pair of screws 65, the angle of the magnetic head 49 can be adjusted individually at the two angular positions.

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 toothless parts 330 and 33d symmetrically with respect to a partial tooth part 33b having about three teeth. . When the first gear 33 is in a stationary state before operation, the toothless portion 33c corresponds to the gear 16 (a part of the gear transmission mechanism 20), and the partial toothed portion 33'b is activated by a start trigger lever to be described later. is regulated from biting into the 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 340 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 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. It is published in a flexible manner.

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 plate 39 from moving back (movement to the right) when the control plate 39 is moved forward and reaches its 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-mentioned prohibition means (consisting of the prohibition lever 69 etc.), the control plate 39, the coil spring 40 as a biasing means for biasing the control plate in the backward motion direction (rightward), and the first gear 33
A coil spring 35 serves as a biasing means for biasing the first gear in a direction in which the partial gear 33b meshes with the gear 16 (a part of the gear transmission mechanism 20), and the toothed portion of the second gear 34 is a gear. 18 (a part of the gear transmission mechanism 20) as a biasing means for biasing the second gear in the direction of meshing with the gear transmission mechanism 20. 33 and the second gear 34 start rotating, the first gear 33 meshes with the gear 16, and then the second gear 34 starts rotating.
Trigger means for meshing the gear 34 with the gear 18 is configured.

As shown in FIG. 2, FIG. 7, FIG. 9, and FIG. 18, a trident-shaped start trigger lever 73 is rotatable at the center of the front surface of the central portion of the sub-chassis Δ11. is attached to.

As is clear from FIGS. 7 and 18, one end 73a of the start trigger lever 73 is bent rearward at a right angle, and the bent portion can be engaged with the first gear 33. . More specifically, the pin 33a protruding from the rear surface of the first gear 33 passes through the first gear and protrudes from the front surface of the first gear by a predetermined amount, and the pin 33a protrudes from the front surface of the first gear 33 by a predetermined amount. is adapted to engage with this portion protruding from the front surface, thereby restricting the rotation of the first gear 33. A second end 73b formed on the start trigger lever 73 and extending to the right is connected to the lever A12.
from the lower surface of the left end. That is, the second end 7.3 of the start trigger lever 73. b is engaged with the end detection lever 10 via levers A and 12, and when the end detection lever 10 moves upward, the start trigger lever 73 is rotated in the clockwise direction 25 in FIG. Thus, the rotation restriction state of the first gear 33 is released. The start trigger lever 73 has a third end 73c extending downward,
The third end engages with the left end of a 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-right direction, is made of a steel plate, and is formed into a single character shape as a whole. That is, 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. Also,
Similarly, as shown in FIG. 10, a coil spring 6 is disposed near the head switching command rod 75 to apply a rightward bias to the third end 730 of the start trigger lever 73. Figures 2, 3 and 17
As shown in the figure, an electromagnetic solenoid 77 is arranged near the motor 24 so as to extend from side to side, and 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 this bin 77b is
A magnetic head switching command rod 75 is loosely fitted into a long hole 3C formed on the main surface of the chassis 3 and extending in the left-right direction.
is engaged with the right end of the That is, when the movable door 7a of the electromagnetic solenoid 77 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). It is. 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. 77
This is a command switch for activating the

As shown in FIGS. 2, 4, 10, and 17, the front surface of the rear bent portion 3a of the chassis 3 to which the control plate 39 is attached is located in the same direction as the control plate, that is, in the left-right direction. A movable member 81 is movably attached at.

This moving member 81 is placed in a position where it is sandwiched between the bending portion 3a and the three control plates. 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 [83] 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 E83 and extending downward is connected to the rear end of the moving member 81 via a coil 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 the second end 83b formed on the lever E83 and extending leftward, and the bottle is connected to a convex portion 399 formed at the rear end of the control plate 39. and the recessed portion 39h, respectively.

When the bin 83C is engaged with the concave portion 39h, the three control plates can move to the most backward movement position (rightward movement limit position), and the bin 83C is engaged with the convex portion 390. When this is the case, the return of the control plate 39 to the most movable 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, 34b of the second gear 34, thereby preventing the second gear from rotating. movement 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 N magnetic 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 of the automobile in which the cassette deck is mounted, and when the key is in the on state, the movable rod 86 of the electromagnetic solenoid 86 is activated.
a is pulled in as the movable member 81 moves to the left and is fixed at the retracted position, so that the pin 83c of the lever E83 engages with the rear end recess 39h of the control plate 39. . Further, when the key is turned off, a coil spring 8 biases the moving member 81 to the right.
The movable rod 86a is pulled out by the urging force of 2, and therefore the pin 83c of the lever E83 engages with the rear end protrusion 39o of the control plate 39.

The above-mentioned moving member 81, coil spring 82, lever E83, coil spring 84, electromagnetic solenoid 86, and surrounding small members related to these move the control plate 39 to the maximum return position when the power is turned off. A prohibition/cancellation means is configured 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 portion 030a 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 sillage 3 and near the capstan 30a.
A pinch roller 90 is rotatably attached to the free end of the support shaft, and an arm member 91 is rotatably attached to the support shaft.

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 56 (I) is formed at the front edge of the open end of each notch 56C, and the bottle 91a is smoothly guided into the notch 560 by the tapered portion 56d. By engaging with the notch 56c, the arm member 91 rotates to the left by a predetermined amount, and the pinch roller 90 is separated from the capstan 30a.In other words, the pair of pinch rollers 90
The capstan 30a is alternatively moved by the reciprocating movement of the slide member 56, which is a component of the head rotation mechanism described above.
They are forced to leave.

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 recess 47b continuous to the protrusion.
is formed.

These protrusions 47a and recesses 47b 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. . When the mountain-shaped protrusion 4.7a 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 five double gears of the reel unit 5. When the concave portion 47b engages with the bottle 30d following the protrusion 47a, 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 one of the bins 30d and prevents the bin from entering the recess 47b of the head stand 47. However, each protrusion 56e is attached to a pair of bins 30 according to the forward and backward movements of the slide member 56.
It is designed to engage with only one of d. That is, the pair of idler gears 28 are configured to be selectively removed from the reel unit by the reciprocating movement of the slide member 56, which is a part of the head rotation mechanism.

Next, a mechanism for loading cassette halves 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 the swinging member A96 at its rear end is connected to the sub-chassis 895 and the support protrusion 3d provided at the left rear end of the chassis 3. It is attached so that it can move freely.

A cassette holder 98 for holding a cassette half is attached to the free end, that is, the front end, of the swinging member A96 so as to be swingable at the center in the front-rear direction. 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 cassette 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.

A movable member 101 is attached to the lower surface of the cassette holder 98, which is made up of two members, an upper surface member 99 and a right surface member 100, and is capable of engaging with the cassette half so as to be movable in the insertion and ejection direction of the cassette half, that is, in the front-rear direction. . A bottle 100a is protruded from the right side of the right side member 100', and the bottle 100a is movably fitted into an elongated 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 clockwise in FIG. 13, thereby imparting a bias force to the moving member 101 in the cassette half ejecting direction, that is, forward. Right 100 copies 10
0 is formed with four parts 100b that recess downward, and when the cassette half is inserted, the right side member 10
0 moves rearward, the pivot shaft 98a of the cassette holder 98 falls into the recess 100b, and the cassette holder moves to the lowered position. A coil spring 104 is connected to the right end of the swinging member A96 for biasing 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 990 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 cassette half in the vicinity of the reel hole 106. Like the above-mentioned projection 99c, this projection 99e is also integrally formed on the upper surface member 99 by stamping or the like, thereby reducing costs 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 protrusion 99e
This makes the state of engagement of e with the cassette half firm.

In the cassette deck, the cassette half is inserted into the cassette holder 98 along its longitudinal direction. In addition, the above-mentioned control mechanism, that is, the head stand 4
A control mechanism for reciprocating the magnetic head 7 and rotating the magnetic head 49 is arranged near the deepest part of the cassette holder 98.

Next, FF operation (tape fast forward operation) and REW operation (
The mechanism for performing the tape rewinding operation will be explained.

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 end portions, that is, the operating end portions of each of the longitudinal operating levers are spaced apart by a predetermined distance in the left and right directions, and each operating end portion has an operating button 115, 116 (first button) provided on the front surface of the housing 2. (shown) is attached. The longitudinal operation lever 113 disposed at the bottom is used to perform the FF operation by its forward movement, that is, backward movement, and the longitudinal operation lever 114 provided at the upper side is used to perform the REW operation by its forward movement. It is meant to guide the movement. These longitudinal operation levers 113 and 11-4 are arranged above the magnetic head 49.

In addition, the both arm control 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 when moving to the right. That is, by pressing any of these longitudinal operation levers 113 and 114 while the head stand 47 is moving to the right, the head stand 47 is moved to the left by a predetermined amount, and thereby the magnetic head 49 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 formed on the head stand 47
．． 7a is a support lever 30 that holds the idler gear 28.
30d of the idler gear 2, thereby engaging the idler gear 2
8 is sharpened *+ from the double gear 5f of the reel unit 5. The story goes back and forth, but for example, as shown in FIGS. 3 and 9, there is a pair of claw members 12 on the chassis 3 that prevents the reel unit (~5) from rotating in reverse.
3 is provided. 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 FIGS. 2, 3, and 16, a plate 124 is located on the right side of the rear end of the bent portion 3f formed at the left end of the chassis 3 in the front-rear direction. It is arranged so that it can be moved freely. A coil spring 125 is connected to the upper end protrusion 124a of the plate 124 to provide a forward bias to the plate. plate 1
A lever H126 formed in a T-shape is rotatably attached to the front end of the lever H126 at its center. In particular, as is clear from FIG. 16, at the front edge of the first end 126a formed on the lever H126 and extending downward, there is a protrusion 113C extending downward from the longitudinal operation lever 113 described above. The edges are brought into contact. Further, a second end portion 12 formed on the lever H126 and extending upwardly
The rear edge of a protrusion 114G extending approximately to the left and protruding from the other longitudinal operation lever 114 is brought into contact with the front edge of the lever 6b. That is, by pushing the longitudinal operation levers 113 and 114, respectively, the lever H126 is rotated counterclockwise and clockwise in FIG. 16.

A lever 1129 formed in a substantially dogleg shape is arranged in front of the plate 124, and the lever 1129 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 connected to a third end 126C formed on the lever 1-1126 and extending forward. It is slidably fitted into a long hole 126d formed in the hole 126d. Further, the second end 129C of the lever 1129 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 in the double gear 5f of the reel unit 5. Namely. When the longitudinal operation levers 11'3 and 114 are pressed, the swinging lever 130 swings backward and forward via the lever H126, whereby the reel units 5 disposed at the rear and front are moved to the respective positions. It can be rotated at high speed.

As shown in FIG. 2, FIG. 7, FIG. 15, and FIG. An intermediate lever 138 is provided that can reciprocate in the moving direction (back and forth direction) of the both arm control levers. A coil spring 139 is connected to the intermediate lever 138 for imparting a forward bias to the intermediate lever. As is particularly clear from FIG. 15, a bin 138a is protruded from the lower surface of the rear end of the intermediate lever 138, and the bin 138a corresponds to the longitudinal operating lever 11.
3. A long hole 140 formed to extend in the front-rear direction at 114
is slidably engaged with. 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 by a predetermined angle about a support shaft 138b at its front end. Further, a coil spring 139 that urges the intermediate lever 138 forward is tensioned so as to be inclined to the right from the rear to the front. 15
It is also biased counterclockwise in the figure. That is,
When both branch hand control levers 113 and 114 are moved forward (move backward) at the same time, the bin 1 of the intermediate lever 138
38a fits into the recess 140a of the elongated hole 140, thereby causing the intermediate lever 138 to move rearward. However, a pair of longitudinal operation levers 113,
If only one of the levers 114 is moved forward, the rear right edge 140b of the elongated hole 140 formed in the front longitudinal operation lever is still in contact with the bin 138a, so the intermediate lever 138 cannot be moved forward. No movement (movement backwards) is made.

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 operation levers 113, 114 is pressed, the lever J142 provided at the rear of the two arm operation levers is swung clockwise 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.

The intermediate lever 138 pushes the swinging member 9d backward by moving forward, and moves the cassette holder 98 from the lowered position described above to the raised position.

Next, various switches provided on the side of the mute switch 143 and their arrangement will be explained.

As is clear from FIGS. 2 and 6, the subchassis B
A bracket 146 is attached to the right end surface of 95, and two switches 14.7, 148 are attached to the bracket.
has been investigated. 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 Δ11. This switch 149 is operated by engagement of the moving plate 52 attached to the subchassis A.

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 20 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, for example, the switch 14.7.148 shown in FIG. 6 is operated,
When the power is turned on to the cassette deck and the motor 2
4 starts rotating. When the motor 24 rotates, the 10th
As shown in the figure, 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 FIG. The slack in the magnetic tape within 155 is taken 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 in FIG. Therefore, the bin 10b protruding from the end detection lever 10 is moved to the top of the mountain-like protrusion 14b of the end detection gear 14 as the end detection gear 14 rotates.

Here, as is clear from the above, the arm 51 of each reel unit 5 is stopped. Therefore, the intermediate lever 7 is not operating, and the end detection lever 10 is in the bin 1.
0b does not continue sliding along the mountain-like protrusion 14b. Accordingly, the pin 10b of the end detection lever 10 comes to rest at the top position of the mountain-like protrusion 14b, whereby the protrusion 14C of the end detection gear 14 engages with the pin 10b. Therefore, the end detection lever 10 moves upward, and the lever AI2
The start trigger lever 73 is rotated clockwise in FIG. 18 via. Thus, the first gear 33, whose rotation was restricted due to the engagement of the pin 33a with one end of the start trigger lever 73, becomes rotatable, and the biasing force of the coil spring 35 causes the clock in FIG. It can be rotated in the direction. Therefore, the partial tooth portion 33b of the first gear 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. The control plate 39 that has reached its maximum forward movement position (leftward movement limit position) is moved back to the right by engaging the engagement recess 69a of the prohibition lever 69 with a bottle 390 protruding from the control plate. movement in the opposite direction) is prohibited. Along with the above rotation of the first gear 33,
Similarly, the moving member 81 shown in FIG. 17 etc. is also moved to the left as shown in FIG. 23. Therefore, the lever E83 rotates clockwise 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. By this operation, the pin 83C of the lever E83 moves into the recess 39h formed at the right end of the control plate 39.
Therefore, the control plate 39 can be moved to the most backward movement position (rightward movement limit position). Also,
When the pin 39e of the control plate 39 enters the engagement recess 69a of the prohibition lever 69, the prohibition lever 69 rotates a predetermined amount clockwise as shown in FIG. Mute switch 143 that was turned on via the switch (see Figure 7)
is 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 47b formed on the head stand 47, and the protrusion 56 provided on the slide member 56.
It depends on the interaction with e, 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, that is, the front pinch roller 90 corresponds to this. It is held detached from the capstan. This is because the pin 91a protruding from the arm member 91 supporting the front pinch roller 90 is fitted into the notch 56c of the slide member 56. Similarly, as shown in FIG. 22, by moving the head stand 47 to the right, the pair of claw members 123 that were engaged with the reel unit 5 are separated 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 electromagnetic solenoid is pulled. Therefore, the start trigger lever 7 is activated via the magnetic head switching command rod 75.
3 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 partial tooth portion 33b of the first gear 33
meshes with gear 16, and the first gear begins to rotate. 1st
Immediately after the gear 33 starts rotating, the protrusion 33f protruding from the first gear engages with the engagement protrusion 69b of the prohibition lever 69 (see FIG. 17), causing the prohibition lever to move in the opposite direction in FIG. Rotate it clockwise. Then, the engagement state between the engagement recess 69a of the prohibition lever and the pin 39e of the control plate 39 is released, and the control plate 39 is instantly moved to the most backward movement position (rightward movement limit position) by the biasing force of the coil spring 40. was forced to return to When the control plate 39 returns to the most backward movement position, the head stand 47 moves to the left, and the magnetic head 49
is forced to separate from the magnetic tape.

When the control plate 39 is in the forward movement position (leftward movement limit position), the stop pin 34a is engaged with a regulating portion 39d (for example, shown in FIG. 4) formed on the control plate.
Rotation of the second gear 34 is restricted. This restriction is released by returning the control plate 39 to the above-mentioned most backward movement position, and, for example, the claw member 51a and the spring member 5 shown in FIG.
1b causes the second gear 34 to rotate clockwise in FIG. 18. Therefore, the toothed portion of the second gear 34 meshes with the gear 18, and the second gear begins to rotate. As the second gear 34 rotates, the stop bin 34a protruding from the second gear moves to the claw portion 52 of the moving plate 52.
a, the moving plate is moved to the left, and the magnetic head 49 connected to the moving plate moves 1 toward the REV side.
Rotated 80 degrees. Further, by moving the moving plate 52 leftward, the switch 149 is switched from the FWD side to the REV side. By the rotation of the second gear 34, the stop pin 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 pin. can only be moved to the left. 2nd gear 3
4 completes 180' rotation, the stop bin 34a
is detached from the protrusion 39C of the control plate 39, but then the pin 33a of the first gear 33 engages with the protrusion 39a of the control plate 39, and the control plate 39 is moved to the forward position (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. Also,
The mute switch 143 is also turned off in the same manner 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, the stop bin 34b of the second gear 34
This is substantially the same as the tape transport direction switching operation from the FWD side to the REV side, except that the moving plate 52 engages with the claw portion 52b (shown in FIG. 18) and moves 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 feeding 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 5'' are applied. It 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 5i.When the tape is being transported to the FWD side, , the group of fixed members is also rotating except for the arm member 51. Also, 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 move the second
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 pin 10b protruding from the end detection lever slides while contacting the mountain-like protrusion 14b of the end detection gear 14, and the pin 10b does not engage with the protrusion 140 of the end detection gear. However, when the members of the reel unit 5 except for the double gear 5f become fixed when the tape stops, the force that urges the end detection lever 10 also disappears, and the protrusion 140 of the end detection gear 14 presses against the pin 10b of the end detection lever. engage with. Therefore, the end detection lever 10
moves upward, and the start trigger lever 73 is rotated clockwise in FIG. 18 via the lever A12. The following is the FWD side → R by pressing the switch mentioned above.
The tape transport direction is switched by exactly the same operation as the switching operation of the tape transport direction to the EV side. In addition,
The automatic switching of the tape transport direction from the REV side to the FWD side 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, as shown in FIGS. 24 and 25, there is a lifting platform for performing an FF operation during tape playback, and a "longitudinal operating lever 1 for F operation.
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, thereby moving the head stand 47 to the left by a predetermined amount, and the magnetic head 49 and
The contact state of 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 ■129 similarly swings clockwise in FIG.
As shown in FIG. 6, the swinging lever 130 is
It rotates counterclockwise in FIG. 26 around .

Therefore, the gear transmission mechanism 13 provided on the swing lever
The first stage gear 132 of No. 5 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 28
is removed from the reel unit 5 by Nt. 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 REW operation longitudinal control lever 114. That is,
The protrusion 114C of the longitudinal operation lever 114 is the lever H126.
The lever H is rotated clockwise in FIG. 25, and the first gear 132
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 FF operation longitudinal operation lever 113 and the REW operation operation longitudinal operation lever 114 can 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 lens 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 83c provided on the lever E83 can engage with the protrusion 39q formed on the right end 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 state in which the stop pin 34a of the second gear 34 is engaged with the regulating portion 39d of the control plate 39 is maintained, and when the power is turned on again, the second gear 34 does not rotate and the tape This prevents unnecessary switching of the transport direction.

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

11 animals 1 (As detailed above, in the cassette deck according to the present invention, the first gear (
33), and a second gear (34) for rotating a magnetic head (49) rotatably provided around an axis substantially parallel to the moving direction of the head stand.
a head rotation mechanism including the first gear and the second gear;
The gear is adapted to be applied with rotational force by a rotational force applying means including a single drive source (motor 24). Therefore, in a cassette deck, the reciprocating operation for attaching the magnetic head to the magnetic tape once and the rotating operation of the magnetic head for matching the forward and reverse running of the magnetic tape are performed by the driving sources on the two J and 4. In comparison, it is easier to downsize the cassette deck as a whole and reduce stress.

Further, in the cassette deck according to the present invention, the rotational force applying means includes a gear transmission mechanism that meshes with the first gear and the second gear, and after the first gear meshes with the gear transmission mechanism, the second gear Trigger means is provided for meshing with the gear transmission mechanism. Therefore, the magnetic head rotates only after the head stand moves and the magnetic head is completely separated from the magnetic tape, thereby preventing damage to the magnetic tape or generation of noise.

[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 that do not show details of the internal structure, and FIGS. 19 to 26 are views of the operation of the cassette deck. FIG. 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 5G...Color 5d...
Bushiko 5e... Expanded diameter part 5f...
Double gear 5a, 5L 30b, 35, 40.41°6
0.70,76.82,84,103°104,, 1
18. 119. 125. 139...]Ile spring 5h...Felt plate 51...Arm 5j, 5k...Washer 7...Intermediate lever 7a, 8a, 8b, 10b, 30d, 33a. 39e, 44. a, 77b, 83c, 86b. 91a, 100a, 129b, 130a. 138a, 138d-...Bin 7b, 64a...Opening 7c, 56c...Notch 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°13
3.134...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, 34b... Stop bin 36.124
...Plate 39...Control board 39d...
Regulation part 39q... Convex part 42...
...Lever B44...Lever C47...
- Head stand 66-49...Magnetic head 51a, 123...Claw member 51b, 99d...Spring member 52...Movement plate 52a, 52b... ...Claw part 53...Lever D 54.66...Spring 56...Slide member 56d, 113a, 114a...-r-pa part 57
...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 73b, 83b, 126b, 129c ...Second end 75...Magnetic head switching command rod 77.86
......Electromagnetic solenoids 77a, 86a...
...Movable rod 79...Operating switch group 81
...Moving member 83...Lever E 83a, 126a, 129a...First end 89
．． 138b... Support shaft 90... Pinch roller 91... Arm member 95... Sub chassis 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...
...Subchassis C 113,114...Longitudinal operation lever 115.1
16...Operation button 121...Longitudinal pin 124a...Top protrusion 126...
...Lever H129...Lever 1130...
... Swinging lever 138 ... Intermediate lever 14
0b... Rear right edge 142... Levy J 143... Mute switch 146... Bracket

Claims (1)

[Claims] a head stand that is reciprocally movable in a direction substantially perpendicular to the tape transport direction; and a head stand that is provided on the head stand so as to be rotatable between two angular positions about an axis that is substantially parallel to the moving direction of the head stand. a magnetic head; a tape transport direction switching means for determining a tape transport direction corresponding to the angular position of the magnetic head; a head stand drive mechanism including a first gear that reciprocates the head stand by rotation; A head rotation mechanism including a second gear that rotates the magnetic head, and a gear transmission mechanism that can mesh with the first and second gears to apply rotational force from a single drive source to the first and second gears. a rotational force imparting mechanism, the cassette further comprising a trigger means for causing the second gear to mesh with the gear transmission mechanism after the first gear meshes with the gear transmission mechanism. deck.