JPS6182318A - Cassette deck - Google Patents

Abstract

PURPOSE:To facilitate making a deck small-sized by using the same driving source for the first gear which drives a head base and the second gear which rotates a magnetic head and providing a control plate, which controls turning of the second gear, with a projection which should be engaged with a stop pin of the second gear. CONSTITUTION:The head base is so provided that it can be freely moved back and forth in the direction approximately orthogonal to the tape carrying direction, and the magnetic head is provided freely turnably on the head base. The head base is moved back and forth by the first gear, and the head is rotated by the second gear. A rotating force is given to the first and the second gears by a motor 24, and a trigger means is so provided that the second gear is engaged with a transmission mechanism after the first gear is engaged with it. The trigger means is moved back and forth by turning of the first gear and is provided with a control plate 39 which controls turning of the second gear, and the control plate 39 is provided with a projection 39c engaged with the stop pin provided on the second gear. Thus, the control plate 39 can be moved forth even by the stop pin, and the deck is made small-sized easily.

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, and there is a strong demand for smaller cassette decks, especially for vehicle-mounted cassette decks, because there is a limit to the space in which the cassette deck 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. J: 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 A type of rotating head 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 rotates to reciprocate the head stand. a head rotation mechanism including a head stand drive mechanism, a second gear that rotates the magnetic head by rotation;
a rotational force applying mechanism that includes a gear transmission 1 that can mesh with a gear and applies rotational force from a single drive source to the first and second gears, the first gear meshing with the gear transmission mechanism. Trigger means is provided for causing the second gear to mesh with the gear transmission mechanism after the second gear is engaged with the gear transmission mechanism, and the trigger means is provided to be reciprocally movable between the most forward position and the most backward position, and the second gear A regulating portion is formed that engages with a stop pin protruding from the second gear to limit the rotation of the second gear when the second gear is caused to move forward by the rotation of the second gear and is not at the most backward movement position. a control plate; a biasing means for biasing the control plate in the backward movement direction; and a biasing means for prohibiting the backward movement of the control plate when the control plate reaches the forward movement position and by the initial movement of the first gear. a prohibiting means configured to release the prohibition; and a biasing means configured to bias the first and second gears in a direction in which they mesh with the gear transmission mechanism; The control plate is characterized in that a mating projection is provided and the control plate is also moved forward by the stop pin.

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 7 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 5C and a bush 5d are fitted to the upper and lower ends of the reel 5b, respectively. The collar 5C can be fitted inside the collar 1 to the reel which is housed in the cassette half and around which the magnetic tape is wound. 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. Moreover, it is rotatably attached to the rotation support shaft 5a.

A coil spring 5Q is interposed between the double gear 5 and the bush 5d to bias the double gear and the bush in a direction that separates them 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 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 50, 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 5Q 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. It is loosely fitted.

The floating lever 8 is also provided with bottles 8b protruding from both ends, and each bottle is freely engaged in a long hole 5m formed in the free end of the arm 51 of the reel unit 5. There is. 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 insert 12 rotatably provided in 1;
In this case, at the right end to the lever, it is pivotably mounted at the 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 protruded from the rear surface of the lower 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 FIG. 7 and FIG. 18, a recess 14a is formed on the surface of the end detection gear 14 facing the end detection lever 10, and a recess 14a is formed on the circumferential surface of the recess that 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 assumed to be at the top of the circle, the diameters of these days are approximately the same size. The bottle 10b protrudingly provided on the end detection lever 10 can engage with these protrusions 14b and 14c.

A tape end detection mechanism for detecting the end of a magnetic tape being played is formed by the above-mentioned unit l-5, intermediate lever 7, floating lever 8, end detection lever 10, and end detection gear 14. Some are configured.

As shown in FIG. 2, FIG. 7, FIG. 9, and FIG.
On the left side are four gears 16.17.1 meshing in series.
8 and 19 is provided, and the end detection gear 14 is connected to the gear transmission #l! It meshes with the final stage gear 19 of the structure. 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 arm 22. The pulley 23 shown in FIG. 10 is rotationally driven via a belt 25 by a motor 24 disposed at the right rear end of the chassis 3. As shown in FIG. In addition, belt 2
5 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 rotation direction of the motor 24 is such that the direction of arrow M is the forward rotation direction, and 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 0 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 parts formed in the reel unit 5, the smaller gear part 2711 is configured to mesh with the large diameter gear part of the double gear 5'' 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 provided on the chassis 3 via a shaft member 30a. The support lever 30 is attached to and detached from the double gear 5f of the reel unit 5 by swinging of the support lever.The support lever 30 is attached to and detached from the double gear 5f of the reel unit 5 by means of a coil spring 301). is biased in a direction that approaches .

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 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 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 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 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 and backward 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 at the right end of the lever B42 to engage 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 be moved by the biasing force of the coil spring 40.
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 freely rotatable at its center via the bin 44a. Lever C attached to chassis 3 in
It is pivotally attached to the rear end of 44. The front end of this lever C44 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 first gear 33, the control plate 39, the coil springs 40, 41, the lever B42, and the 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 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. Further, the rotation ratio between 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 pins 34a and 34b are protruded from the rear surface with a pitch of 180°, and one stop pin 34a passes through the second gear so as to also protrude from the front face of the second gear. are doing. In addition, both stop pins 34a
, 34b can engage with the right edge of a protrusion 39c protruding from the upper end of the rear end of the control plate 39. That is, the control plate 39 can also be moved forward by the two stop pins.

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 attached to the rear surface of the sub-chassis A 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 pin 34a at its right edge, and the claw portion 52b engages with the stop pin 34a at its left edge. That is, the moving plate 52 reciprocates as the second gear 34 rotates 1806 times 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 19 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 fibers.

The angular positions of the four magnetic heads shown in FIG. 5 are referred to as the first angular position of the magnetic head, and the position rotated by 180 degrees from the first angular position is referred to as the second angular position of the magnetic head. . 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 arranged at a position sandwiching the slide member 56 together with the bearing member 57, and is rotatably attached (pull) to the front end of the bearing member 57 in the main part of the fan.However, In order to prevent the joint between the fan-shaped gear 59 and the bearing member 57 from interfering with the reciprocating movement of the slide member 56, the slide member 56 has an elongated hole 56a into which the joint is loosely fitted.
is provided extending in the front-back direction. Note that the five fan-shaped gears are click-biased by a coil spring 60. A pin 59a is protruded from the right end surface of the fan-shaped gear 59, and the pin is pivotally attached to the slide member 56. That is, the fan-shaped gear 59 swings as the slide member 56 reciprocates. A 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 49.

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 control mechanism causes the head stand 47 to reciprocate and the magnetic head 49 to rotate. 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 movements, 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 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 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 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 6/I are positioned so as to sandwich the magnetic head 49 from the front and back, and both ends are bent in a U-shape, and the lower side of the U-shape A protrusion 49 that protrudes from the outer periphery of the magnetic head 49
By engaging with a, rotation of the four magnetic heads is restricted.

Note that an opening 64a is provided on the upper surface of the regulating member 64 so that the protrusion 49a of the magnetic head does not come into contact with the regulating member 64 when the magnetic head 49 rotates. 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 both 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 6
5 and the spring 66 constitute positioning means for positioning both the front and rear ends of the regulating member 640.

Further, the positioning means and the regulating member 64 constitute an azimuth adjusting means. That is, a pair of screws 6
By tightening or loosening 5, 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 making 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, which contributes to the reduction of 1.

The story goes back and forth, but for example, as shown in FIG. 18, the first gear 33 is provided with two toothless parts 33c and 33d symmetrically with respect to a partial tooth part 33b having about three teeth. ing. When the first gear 33 is in its operable stationary state, the missing tooth portion 33c corresponds to the gear 16 (a part of the gear transmission mechanism 20), and the partial tooth portion 33b corresponds to the gear 16 (part of the gear transmission mechanism 20) by the start 1 to regale lever described later. 16 is prohibited. On the other hand, the second gear 34 also has a 180°
Two toothless portions 34G and 34d are formed with a pitch of , and the toothed portion is the gear 18 as described later.
The rotation of the second gear is regulated so as not to get stuck in the second gear.

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, six prohibition levers are arranged on the left side of the control plate 39, and the lower ends of the prohibition levers are attached to the rear end bending portion 3a of the chassis 3. It is attached so that it can move 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 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), the claw member 51a and the spring member 51a, which serve as biasing means for biasing the second gear in the direction of meshing with the gear transmission mechanism 20, and peripheral small members related thereto, 33 and the second gear 34 start rotating, the first gear 33 meshes with the gear 16 and the second gear 34 starts rotating.
Trigger means for meshing the gear 34 with the gear 18 is configured.

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. 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 731 formed on the start trigger lever 26-73 and extending to the right is
It engages with the left end of the lever AI2 from the lower surface of the left end. That is, the second end 7 of the start trigger lever 73
3b is engaged with the end detection lever 10 via the lever A12, and when the end detection lever 10 moves upward, the start trigger lever 73 moves to the 18th position.
It rotates clockwise in the figure, and the rotation restriction state of the first gear 33 is released. The start trigger lever 73 has a third end 7 extending downward.
3C, 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-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, as shown in FIG. 10, a start trigger lever 7 is located near the head switching command rod 75.
A coil spring 6 is disposed at the third end 73c of the third end 73c to apply a rightward bias. Figures 2 and 3
As shown in the figure and FIG. 17, an electromagnetic solenoid 77 is disposed near the motor 24 and extends 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. This bottle 77b
The lower end of the magnetic head switching command rod 75 is loosely fitted into an elongated 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 magnetic head switching command rod 75. 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, a group of seven operation switches are arranged on the front side of the housing 2 and to the right of the opening 2a.
One switch in the group of operation switches serves as a switching command switch for operating the electromagnetic solenoid 77. As shown in FIGS. 2, 4, 10, and 17, on the front surface of the rear bent portion 3a of the chassis 3 from which the control plate 39 has been removed, there are
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 be engaged 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. Moving member 81
A coil spring 82 is connected to the right end of the movable member for imparting a rightward bias to the movable member.

As is particularly clear from FIG. 3, a T-shaped lever F83 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 a second end 83b formed on the lever E83 and extending leftward, and the bottle is connected to a convex portion 39g formed at the rear end of the control plate 39. and four parts 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 39G. 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 restricting rotation of the second gear.

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 into the tip of the movable rod. This bottle 86b is
A third threaded portion 8 formed on the lever 83 and extending upward by n
It is pivotally attached to the tip of 3d. In addition, the movable rod 86
When lever a is in its protruding position (the position shown in FIG. It is activated by operating the key of the car in which the cassette deck is installed, and when the key is in the on state, the movable ring 8 of the electromagnetic solenoid 86 is activated.
6a is retracted and fixed at the retracted position as the movable member 81 moves to the left, so that the pin 830 of the lever F.83 engages with the rear end recess 39h of the control plate 39. ing. Furthermore, when the key is turned off, the movable rod 86a is pulled out by the urging force of the coil spring 82 that urges the movable member 81 to the right, so that the pin 83C of the lever E83 is moved to the rear end of the control plate 39. Engages with the protrusion 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 for prohibiting return to the rightward movement limit position and canceling 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 is also connected to 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 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 passes through the arm member in the vertical direction, and a spring for adjusting the azimuth of the magnetic head 49 is attached to the lower left edge #i1 of the bottle. 66(
For example, see FIG. 5) is engaged at one end. The arm member 91 is connected to the pinch roller 90 by this spring 66.
is biased in a direction approaching 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 end portions of the slide member 56 engage with the front and rear end portions of the slide member 56, respectively. More specifically, two notches 56 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.
c is 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 is rotated to the left by a predetermined amount, and the pinch roller 90 is detached from the capstan 30a. That is, the pair of pinch rollers 90 are alternatively moved 111H'd from the capstan 30a by the reciprocating motion 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 4-7a are formed on both left and right sides of the head stand 47 carrying 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 4 continuous to the protrusion.
7b is formed.

These protrusions 47a and recesses 471) 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 111-shaped projection 47a engages with the bin 30d, the support lever 30 moves from the double gear 5f of the reel unit 5 to the idler gear 28 attached to the support lever 30! When the four parts 47 (1) engage with the pin 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 a swinging member A96 at the 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 can be installed freely.

The free end, that is, the front end of the swinging member A96 has a collar 1-
A cassette holder 98 that holds the half is swingably attached at the center in the front-rear direction. Note that, 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. Further, from this state, the swinging member 96 swings downward by a predetermined angle,
The position of the cassette holder 98 when the cassette half held by the cassette holder 98 is positioned at the performance position is referred to as the lowered position of the cassette holder. The cullet holder 98 is movable between this lowered position and the upper back 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 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 clockwise in FIG. 13, thereby imparting a bias force to the moving member 101 in the cassette half ejecting direction, that is, forward. Right side member 10
A recess 100b that recesses downward is formed in the front end of the right side member 10 when the cassette half is inserted.
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 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 nine top members are also formed with another protrusion 990 that engages the cassette half in the vicinity of the reel hole 106. Like the above-mentioned projection 99C, this projection 99c is also formed integrally with 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 that extend in the front-rear direction and are vertically stacked are attached to the subchassis C111 so as to be able to reciprocate in the front-rear direction. The front end portions of the longitudinal operation levers, that is, the operation end portions, are separated by a predetermined distance to the left and right, and each operation end portion has an operation button 115, 116 (first The longitudinal control lever 113 located at the bottom is used for forward movement, that is, backward movement, to perform the "F" operation. The lever 114 is used to perform the REW operation by its forward movement.These longitudinal operation levers 113 and 114 are arranged above the magnetic head 49.The pitcher operation levers 113 and 114 are also operated by a coil. The springs 118 and 119 each provide a forward bias.As is particularly clear from FIGS. Long bottle 1 protruding from
Tapered portions 113a and 114a are formed at the upper end of the head 21 to be engaged when the head stand is 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 47 formed on the head stand 47
a engages with the pin 30d of the support lever 30 that holds the idler gear 28, so that the idler gear 28 is disengaged from the double gear 5f of the reel unit 5 by 1if. The story goes back and forth, but for example, the third
As shown in the drawings and FIG. 9, a pair of claw members 123 are provided on the chassis 3 to prevent the reel unit 5 from rotating in reverse. 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.

Based on the above, 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. It is attached movably in the direction. A coil spring 125 is connected to the upper end protrusion 124a of the plate 124 to provide a forward bias to the plate. A T-shaped lever l-1126 is rotatably attached to the front end of the plate 124 at its center. In particular, as is clear from FIG. 16, a first pant portion 126a formed on the lever H126 and extending downward.
A rear edge of a protrusion 113C extending downwardly from the longitudinal operation lever 113 is brought into contact with the front edge of the lever. Furthermore, a protrusion 114C is provided on the front edge of the second end portion 126b formed on the lever l-1126 and extends upward, and protrudes from the longitudinal operation lever 114 so as to extend substantially to the left.
The trailing edges of are abutted. That is, by pushing the longitudinal operation levers 113 and 114, respectively, the lever H1
26 rotates counterclockwise and clockwise in FIG.

In front of the plate 124, a lever 1129 approximately shaped like a square is disposed, and its central bent portion is rotatably attached to the left bent portion 3f of the chassis 3.Lever 1129 A pin 129b is protruded from the tip of the first @i portion 129a that is formed on the lever H126 and extends rearward, and this pin 129b is formed on the third end 126C that is formed on the lever H126 and extends forward. 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. Further, 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 27'' 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 H126, 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 that can reciprocate in the moving direction (back and forth direction) of both pitcher operating 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 pin 138a is protruded from the lower surface of the rear end of the intermediate lever 138, and the pin 138a is attached to the longitudinal operating lever 11 in correspondence with the pin 138a.
3. A long hole 140 formed to extend in the front-rear direction at 114
is slidably engaged with. A recess 140a into which a pin 138a can be inserted is formed on the right end side of the central portion 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 13B forward is stretched so as to be inclined to the right from the rear to the front, so that the intermediate lever 138 is rotated around the support shaft 138b. 15
It is also biased counterclockwise in the figure. That is,
When both pitcher operating levers 113 and 114 are moved forward (move backward) at the same time, pin 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 1/I O+ of the elongated hole 140 formed in the other longitudinal operating lever is still in contact with the bin 138a, so the intermediate Forward movement of lever 138 (movement backward)
Not announced.

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 both pitcher operation levers is swung clockwise in FIG. 15, and the mute switch 143 is operated. It is done like this.

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 is attached to the left I of the swinging member 96 (for example, shown in FIG. 6).
It directly engages with the N portion 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 146 is attached to the right end surface of the switch 95, and two switches 147 and 148 are attached to the bracket. 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 A.

Further, as shown in FIG. 15, the sub-chassis 111
A switch 150 for cutting off the power supply to the cassette deck is fixed on the top, and this switch is operated when the intermediate lever 138 is 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 147 and 148 shown in FIG.
starts rotating. When the motor 24 rotates, as shown in FIG. 10, the small pulley 24a rotates in the direction of arrow N, the pulley 23 rotates in the direction of arrow N, and the pair of front and rear flywheels rotate in the directions of arrows O and P, respectively. It will be done.

Therefore, the pair of reel units 5 are moved in the directions of arrows Q and N (as shown in the 10th figure) through the pair of idler gears 28, respectively.
Start rotating. In this way, the pair of reel units 5
Since the magnetic tapes rotate in opposite directions, slack in the magnetic tape in the cassette half 155 is wound up.

When the slack of the magnetic tape is wound up and a predetermined tension is applied to the magnetic tape, all of the constituent members of the reel unit 5 shown in FIG. 11 except for the double gear 5f absorb the tension. Being fixed by the reaction force, 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 rotated in the opposite direction in FIG. 18 via the gear transmission mechanism 20 by the rotation of the motor 2/l. Therefore, the bottle 10b protruding from the end detection lever 10 is moved to the top of the mountain-like protrusion 1/lh of the end detection gear as the end detection gear 140 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 activated, and the bin 101) of the end detection lever 10 does not continue sliding along the mountain-like protrusion 14b. Therefore, 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 start trigger lever 73 rotates clockwise in FIG. 18 via the lever A12. 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 first gear 33 to rotate.
It is rotated in the direction of the hour mark in Figure 8. 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 moves the three control plates shown in FIG. 17 to the left, and therefore the head stand 47 moves to the right as shown in FIG. comes into contact with. Furthermore, when the control plate 39 reaches the forward movement position (leftward movement limit position), the inhibition lever 69 is inserted into the bottle 3'9e protruding from the control plate.
The backward movement (movement to the right) is prohibited by the engagement of the engagement recess 69a. As the first wheel 33 rotates, the moving member 81 shown in FIG. 17 is also moved to the left as shown in FIG. 23. Therefore, lever E
83 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. This action causes the lever F
The pin 83c of 83 comes to engage with the four portions 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). Further, as 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.
The mute switch 143, which has been turned on by the upper end of the prohibition lever via the lever J142 (for example, see FIG. 7), is turned off.

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 5 of the front reel unit 5, and only the rear reel unit 5 is rotated. becomes. 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 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 rod 77a of the electromagnetic solenoid is pulled. Therefore, through the magnetic head switching command rod 75, the start i to trigger lever 73 rotates in the direction shown in FIG. When the first gear 33 becomes rotatable and moves to a3 in Fig. 18 due to the biasing force of the coil spring 35, ■
It can be rotated in one direction. Therefore, the partial teeth 33)) of the first gear 33 mesh with the 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 six prohibition levers (see FIG. As shown in the figure, the engaging recess 69a of the inhibiting lever and the pin 3 of the control plate 39 are rotated in the direction opposite to the cutting direction.
9e is released, and the control plate 39 is instantly returned to the most backward movement position (rightward movement limit position) by the biasing force of the coil spring 40. 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 moved away 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. Due to the rotation of the second gear 34, the stop pin 34a protruding from the second gear is moved 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 is rotated 180° toward the REV side. Further, as the moving plate 52 moves to the left, the switch 149 is switched from the FWD side to the REV side.

Due to 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. be moved to the left. 2nd gear 3
4 completes 180° rotation, the stop pin 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 held in 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.
Regarding the operation of switching from the FWD side to the REV side, except that the stop pin 34b of the second gear 34 engages with the claw portion 52b (shown in Figure 18) of the movable plate 52 and moves the movable plate to the right. This operation is substantially the same as the tape transport direction switching operation in , and will not be described in detail.

Next, the operation of automatically switching 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 of the purchased parts of the reel unit 5 shown in FIG. 11, except for the double gear 5f, is fixed by the reaction force of the tension. Therefore, only the double gear 5f continues to idle with respect to these fixed members zIY via the felt plate 5h. When the tape is being transported toward the FWD side, the fixed members are also rotating except for the arm member 51. Further, the arm portion +45i receives a biasing force due to rotational force, and biases the intermediate lever 7 via the floating lever 8 in the counterclockwise direction of nH as shown in FIG. 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 opposite direction h1 in FIG.
1) slides while contacting the mountain-like protrusion 14b of the end detection gear 14, and the protrusion 14C of the end detection gear and the bottle 10b
There are no words related to this. However, reel unit 5
When the members excluding the double gear 5f are fixed when the tape is stopped, the force urging the end detection lever 10 disappears, and the protrusion 14c of the end detection gear 14 engages with the pin 10b of the end detection lever. Therefore, the end detection lever 10 moves upward, and the star 1 to trigger lever 73 rotate clockwise in FIG. 18 via the lever A12. The following operation is exactly the same as the operation of switching the tape transport direction from the FWD side to the REV side by pressing the switch described above. Note that 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.
Not detailed.

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, the longitudinal operation lever 1 for FF operation is
Press 13 to move it backwards.

Then, the mute switch 14 is activated via the lever J142.
3 is turned on. In addition, the longitudinal bin 121 protruding from the left end of the head stand 47 is suppressed 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 1129 similarly swings clockwise in FIG.
It rotates in the opposite direction as shown in Fig. 26 around point a. Therefore, the gear transmission mechanism 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 is 1llin12 from reel unit 5. Therefore, the rear reel unit 5 rotates at high speed,
The tape is fast forwarded.

When performing a REW operation, this is done by pushing the longitudinal operating lever 114 for REW operation. 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 stage gear 132 and the final stage gear 134 mesh with the front flywheel 27 and reel unit, respectively. It is. Note that the leftward movement of the head stand 47 is performed using the tapered portion 11 of the longitudinal operation lever 114.
4a 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 wooden longitudinal operating levers, 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 for retrieval by the listener. In addition, for example, the switch 150 shown in FIG. 2/1 also operates, so the electromagnetic solenoid 86 (second
3) 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 39g formed on the right end of the control plate 39. This prevents the control plate 39 from returning to the most backward movement position (rightward movement limit position).

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.

Effects of the Invention 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;
A rotational force is applied to the gear by a rotational force applying means including a single drive source (motor 24). Therefore, compared to a cassette deck in which two or more drive sources perform the reciprocating motion to attach and detach the magnetic head to the magnetic tape and the rotational motion of the magnetic head to match the forward and reverse running of the magnetic tape, the entire cassette deck This makes it easier to downsize and reduce costs.

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 A trigger means is provided which meshes with the gear transmission mechanism. Therefore, the magnetic head rotates only after the head stand moves and the magnetic head is completely detached from the magnetic tape, thereby preventing damage to the magnetic tape or generation of noise.

Further, in the cassette deck according to the present invention, the trigger means is provided so as to be able to reciprocate between the forwardmost position and the most backward position, and is pulled forward by the rotation of the first gear. a control plate formed with a regulating portion (39d) that engages with stop pins (34a, 34b) protruding from the second gear to regulate rotation of the second gear when the second gear is not at the most backward position; (39), and the control plate is provided with a protrusion (39c) that engages with the stop pin so that the control plate is also moved forward by the stop pin.

The control plate (39) performs its function by reciprocating through a predetermined stroke, but it is also possible to move the control plate by the stroke by using only the first gear. however,
If the stroke necessary for the operation of the control plate is to be ensured only by the first gear, the diameter of the first gear must be made considerably large, which results in an increase in the size of the cassette deck as a whole. Become. In the cassette deck according to the present invention, the second gear also causes the control plate to move forward, and the interaction between the first and second gears ensures the stroke, thereby keeping the diameters of both gears small. Therefore, it is easier to reduce the size of the cassette deck as a whole.

[Brief explanation of drawings]

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. This is a diagram for explaining the theory 66. 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 5o, 5Q, 30b, 35.40.41゜6
0.70, 76.82, 84, 103°104.118
, 119, 125.1'39... Coil spring 5h... Felt plate 51... Arm 5j, 5k... Washer 7... Intermediate levers 7a, 8a, 8b, 10b, 30d, 33a. 39e, 44a, 77b, 83c, 86b. 91a, 100a, 129b, 130a. 1.38a, 138d, ...,, Bin 7b, 64a・
. . . Frontage portions 7c and 56c . . . Notch portion 8 . . . Idle lever 10 . 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 3o...Support lever 30a...Capstan 33...
...First gear 331)... Partial tooth portions 33c, 33d, 34c, 34d... - Missing tooth portion 3
4... Second gears 34a, 34b... Stop pin 36.124
...Plate 39...Control board 39d...
Regulation part 3C1... Convex part 42...
...Lever B44...Lever C47...
- Head stand 49... Magnetic heads 51a, 123... Claw members 51b, 99d... Spring member 52... Moving plates 52a, 52b... ...Claw portion 53...Lever D 54.66...Spring 56...Slide member 56d, 113a, 114 a=Tapered part part 7
...Bearing member 59 ... Fan-shaped gear 6
4...Regulation member 65...Screw 6
9...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 Rondoor 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... Sub chassis B 96... Swinging member 196a... ...
・Left end portion 98...Cassette holder 98a...
.....Owing shaft 99 .....Top member 1
00... Right side member 101... Moving part 4
J 102... Lever F106...
... Reel hole 107 ... Concavity 111
...Zub chassis C 113,114...Longitudinal operation lever 115.1
16...Operation button 121...Longitudinal bottle 124a...Top protrusion 126...
... Lever 1" 129 ... Lever ■ 130
..... Swinging lever 138 ..... Intermediate lever 140b ..... 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 that causes the second gear to mesh with the gear transmission mechanism after the first gear meshes with the gear transmission mechanism; The gear is provided so as to be reciprocally movable between the first gear position and the most backward movement position, is caused to move forward by the rotation of the first gear, and is engaged with a stop pin protruding from the second gear when the first gear is not in the most backward movement position. a control plate on which a regulating portion for regulating the rotation of the second gear is formed; a biasing means for biasing the control plate in a backward movement direction; a prohibiting means configured to prohibit the backward movement of the control plate and release the prohibition by the initial movement of the first gear; A cassette deck comprising a biasing means for biasing the deck, wherein the control plate is provided with a protrusion that engages with the stop pin, and the control plate is also caused to move forward by the stop pin.