JPH0444806B2 - - Google Patents

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 increasingly smaller, 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 halves are 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 track in both forward and reverse directions.

Various configurations have already been proposed for switching the magnetic head between forward and reverse directions. 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 method in which the tape is switched electrically, and a method 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, azimuth adjustment can be performed independently for both forward and reverse running directions of the magnetic tape, and therefore better reproduction frequency characteristics can be obtained compared to other formats. 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.Then, the magnetic head is then 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, this has been a problem in reducing the overall size and cost of the cassette deck.

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

The cassette deck according to the present invention includes a head stand that can reciprocate in a direction substantially perpendicular to the tape transport direction, and a head stand that is placed on the head stand to move between two angular positions about an axis that is substantially parallel to the moving direction of the head stand. It includes a rotatably provided magnetic head, 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 cassette deck including a head stand drive mechanism and a head rotation mechanism including a second gear that rotates the head stand by rotation, the gear train (gear transmission mechanism) being meshed with each other and driven by a single drive source. )and,
activating means for selectively meshing the first gear and the second gear with the gear train; and after the first gear meshes with the gear transmission mechanism, the second gear meshes with the gear transmission mechanism. A trigger means is provided, and the trigger means is provided so as to be able to reciprocate between a most forward position and a most backward position corresponding to a position in which the head base is advanced relative to the tape, and the trigger means is configured to be able to reciprocate between a forward position and a most backward position corresponding to a position in which the head base moves forward with respect to the tape. a control plate formed with a regulating portion that engages with a stop pin protruding from the second gear to restrict rotation of the second gear when the second gear is moved forward by the gear and is not at the most backward movement position; , 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 causing the control plate to move in the backward movement direction by the initial movement of the first gear. a prohibition means configured to release the prohibition, and a biasing means configured to bias the first and second gears in a direction to mesh with the gear transmission mechanism, the control plate having a stop pin engaged with the stop pin. The control plate is also moved forward by the stop pin, and the first gear has teeth missing in a predetermined range at a portion that should mesh with the gear transmission mechanism immediately after the first gear starts moving. It is characterized by being familiar.

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

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

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

As shown in FIGS. 2 and 3, as well as FIGS. 9 and 10, a chassis 3 made of a steel plate or the like is provided within the housing 2. As shown in FIGS. As shown in FIG. 4, a pair of reel units 5 are arranged side by side in the front and back direction on the chassis 3.
Moreover, it is rotatably attached to the chassis. As is clear from FIG. 11, the reel unit 5 has a rotating support 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 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.
Moreover, 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 in a direction that separates them from each other.
In addition, the enlarged diameter portion 5e of the reel 5b and the double gear 5f
A felt board 5h is provided between the two. The felt plate 5h is attached to the enlarged diameter portion 5e, and is in slidable contact with the double gear 5f. An arm 5i is provided between the upper surface of the enlarged diameter portion 5e and the collar 5c, and the reel 5 is attached at one end of the arm 5i.
It is rotatably attached to the outer periphery of b. The lower and upper surfaces of the arm 5i are connected to the enlarged diameter portion 5 of the reel 5b.
e and the collar 5c via washers 5j and 5k, and a coil spring 5l is disposed between the upper washers 5k and the arm 5i 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 substantially in the front-rear direction.
Further, it is attached to the chassis 3 by a pin 7a 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 pin 8a protruding from the center of a floating lever 8 freely movable on the chassis 3 is inserted into the opening. It is loosely fitted. Pins 8b are provided protruding from both ends of the floating lever 8, and each pin is connected to the reel unit 5.
The arm 5i is slidably engaged in a long hole 5m formed at the free end of the arm 5i. 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 A that is fixed to the upper surface of the rear end of the chassis 3 and protrudes upward.
The upper end of the lever A12 is pivotally attached to one end of the lever A12, in this case the right end of the lever A. A projection 1 extending downward is provided at the lower end of the end detection lever 10.
0a is provided, and this 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 pin 10b projects from the rear surface of the lower end of the end detection lever 10, and the pin is rotatably attached to the sub-chassis A. End detection gear 14 facing the rear end surface of end detection lever 10
is engaged in. As is clear from FIGS. 7 and 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. substantially mountain-shaped protrusions 14b having the same shape.
There are three 120° pitches. In addition, each of the above-mentioned mountain-shaped protrusions 14 is provided at the center of the recess 14a.
Three protrusions 14c, each having the same shape, are formed that extend radially toward the valley between b. Each protrusion 14
When a circle circumscribing the top of the projection 14c and a circle inside the top of each protrusion 14c are imagined, the diameters of these circles are approximately the same. The pin 10b protrudingly provided on the end detection lever 10 can engage with these protrusions 14b and 14c.

The reel unit 5 described above and the intermediate lever 7
, the floating lever 8 , the end detection lever 10 ,
The end detection gear 14 constitutes a part of a tape end detection mechanism for detecting the end of the magnetic tape being played.

As shown in FIGS. 2, 7, 9 and 18, on the rear surface of the sub-chassis 11 and to the left of the end detection gear 14, there are four gears 16, 17, 18 meshing in series. A gear transmission mechanism 20 consisting of an end detection gear 1 and 19 is provided.
4 meshes with the final stage gear 19 of the gear transmission mechanism. 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 sub-chassis A11. ing. 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 connected to the motor 24
It is directly routed around a small pulley 24a fitted to the output shaft of the motor.

As is clear from FIG. 10, the belt 25 is
It also runs 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 in the direction of arrow M, and the pulley 23
is in the direction of arrow N, and a pair of flywheels 2
A belt 25 is wound around the belts 7 such that the belts 7 are constantly rotated in the direction of arrow O and the direction of arrow P, respectively.

The flywheel 27 has gear portions 27a and 27b of different sizes on its outer and inner circumferences. Of the two large and small gear portions formed on the flywheel 27, 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 provided on the chassis 3 via a shaft member 30a. It is attached to and detached from the double gear 5f of the reel unit 5 by swinging the support lever. Further, the support lever 30 is supported by the idler gear 2 by a coil spring 30b.
8 is biased in the direction toward the double gear 5f.

Figures 2 and 7. As shown in FIGS. 9 and 18, a gear 1 is provided on the rear surface of the sub-chassis A11.
A first gear 33 and a second gear 34 are rotatably mounted above the gears 6 to 19. The first gear 33 meshes with the gear 16 of the gear transmission mechanism 20 (see, for example, FIG. 7), and the second gear 34 meshes with the gear 18 of the gear transmission mechanism.

Here, the gear transmission mechanism 20 and the worm 2
2, pulley 23, 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 first gear 33 and the second gear 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 projects from the rear surface of the first gear 33, and one end of a coil spring 35 that biases the first gear 33 clockwise in FIG. 18 is hung on the pin. The coil spring 35 is
The other end is hung on a plate 36 fixed to the tip of the rotating shaft (not shown) of the gears 16 and 18.

As shown in FIGS. 2, 3, 9, and 11, a bent portion 3a extending upward in parallel with the sub-chassis A is formed at the rear end of the chassis 3, that is, at the rear of the sub-chassis A11. ing. 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 connected to the right end of the control plate 39 for biasing the control plate to the right, that is, in the backward movement direction. control board 3
A protrusion 39a that can be engaged with the pin 33a of the first gear 33 is formed at the upper end of the gear 9 at approximately the center thereof. The right edge of the protrusion 39a engages with the pin 33a, so that the control plate 39 is moved forward by the rotation of the first gear 33. As shown in FIGS. 2, 4, and 10, the lower part of the control plate 39 is connected to the control plate via a coil spring 41, and moves to the left as the control plate moves forward. A lever B42 is arranged to do this. A protrusion 42a is formed at the right end of the lever B42 and engages with the right edge of a 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. Along with the backward movement, 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 a pin 44a. It is pivotally attached to the rear end of a lever C44 attached to the chassis 3. The front end of the 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. In addition,
The driving direction of the magnetic tape is the front-back direction, and therefore the moving direction of the head stand 47 is approximately perpendicular to the tape driving direction.

A head stand for driving the head stand 47 by the above-described first gear 33, control plate 39, coil springs 40, 41, lever B42, lever C44, and peripheral small members related thereto. A drive mechanism is configured.

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 of the first gear 33 and the second gear 34 is 1:1.

As is clear from Figures 7 and 18, the second
Two stop pins 34a and 34b are protruded from the rear surface of the gear 34 with a pitch of 180°.
One stop pin 34a passes through the second gear so as to protrude also from the front face of the second gear.
Note that both stop pins 34a and 34b are connected to the control plate 3.
9 can be engaged with the right edge of a protrusion 39c protruding from the upper end of the rear end. 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 FIGS. 9 and 18, a movable plate 52 made of a steel plate is attached to the rear surface of the subchassis A so as to be able to reciprocate in the left-right direction. At the right end of the moving plate 52, claws 52a and 52b are formed which can engage 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 movable plate 52 reciprocates as the second gear 34 rotates 180 degrees in one direction.

As shown in Figures 2, 3 and 9,
A substantially dogleg-shaped lever D53 is disposed near the left end of the moving plate 52, and is rotatably attached to the upper surface of the chassis 3 at its central bent portion. Further, the lever D53 is 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 Figures 2, 5 and 9,
The magnetic head 49 is located to the right of the slide member 56. The magnetic head 49 is mounted on the head stand 47 by a bearing member 57 fixed on the head stand 47.
The magnetic head is rotatably supported around an axis parallel to the direction of movement of the magnetic head, that is, around an axis perpendicular to the magnetic tape contact surface of the magnetic head. magnetic head 4
The rotating shaft portion 9 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 fiber. The angular position of the magnetic head 49 shown in FIG. 5 will be referred to as the first angular position of the magnetic head, and the position rotated 180 degrees from the first angular position will be referred to as the second angular position of the magnetic head. . The magnetic head 49 is rotatable between the first angular position and the second angular position.

As is clear from FIGS. 5 and 9, a fan-shaped gear 59 is disposed at a position sandwiching the slide member 56 together with the bearing member 57, and is rotated at the front end of the bearing member 57 in the main part of the fan. It is attached so that it can move freely. 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 a long hole 56a extending in the front-rear direction into which the joint is loosely fitted. It is provided. Note that the fan-shaped gear 59 is biased by a coil spring 60. A pin 59a is provided protruding 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 described above and the moving plate 52
, lever D53, spring 54, slide member 56, bearing member 57, fan-shaped gear 59
A head rotation mechanism for rotationally driving the magnetic head 49 is composed of the coil spring 60, the gear 61, and small peripheral members related thereto. Further, the head rotation mechanism and the above-mentioned 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 can be understood from the above explanation, when the first gear 33 rotates 360 degrees, the head stand 47 moves forward and backward, and the second gear 34 rotates 180 degrees. By doing so, the magnetic head 49 can be rotated 180 degrees.

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, on the head stand 47 there is a regulating member 6 extending in the front and back direction.
4 are fixedly installed 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 central portion, and both front and rear ends extending away from each other around the central portion are connected to the magnetic head 49. can be engaged with the outer periphery of the 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 in a U-shape, with the lower side of the U-shape being magnetically Rotation of the magnetic head 49 is restricted by engaging a protrusion 49a protruding from the outer periphery of the head 49. Note that the magnetic head 4 is located on the upper surface of the regulating member 64.
An opening 64a is provided to prevent the protrusion 49a of the magnetic head from hitting the regulating member 64 when the magnetic head 9 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 surfaces of both front and rear ends of the regulating member 64 and the head stand 47 to apply an upward bias force 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, a pair of screws 65
By tightening or loosening the two angular positions, the angle of the magnetic head 49 can be adjusted individually.

Note that the regulating member 64 is divided at its center into two members, each of which is connected to the magnetic head 49.
A similar effect can also be obtained by fixing the head stand 47 in a cantilevered manner directly above the head stand 47. 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 has two toothless parts 33c symmetrically with respect to a partial tooth part 33b having about three teeth.
and 33d are provided. When the first gear 33 is in a stationary state before its operation, the missing tooth portion 33c corresponds to the gear 16 (a part of the gear transmission mechanism 20), and the partial tooth portion 33b is activated by a start trigger lever to be described later. Biting into the gear 16 is restricted. On the other hand, the second gear 34 is also formed with two toothless parts 34c and 34d with a pitch of 180°, and when the second gear is in a stationary state before operation, the toothless part 34c is connected to the gear 18 (gear transmission mechanism 20), and the rotation of the second gear is regulated so that the toothed portion does not bite into the gear 18, as will be described later.

Here, the missing tooth portion 33d located immediately after the initial movement of the first gear will be described in detail. First, the "locked state by the start trigger lever 73 (at this time, the first
When the toothless portion 33c of the gear 33 facing the gear train 16 is released, the first gear 33 is rotated by the biasing means (spring 35), and the partial tooth portion 33b meshes with the gear 16. , the rotation continues (see Figures 7 and 18). As a result of this rotation, the protrusion 33f provided near the partial tooth portion of the first gear 33 engages with the prohibition lever 69, and by rotating the prohibition lever 69, the return movement of the control plate 39 is prohibited (the prohibition lever 69 The state in which the engagement recess 69a and the pin 39e of the control plate 39 are engaged with each other is released, and the control plate 39 reaches the most backward movement position (rightward) by the biasing means 40. At the same time, the head stand is also completely retracted (to the left) (see Figures 2, 4, 7, and 17).

Further, by moving the control plate 39 to the most backward movement position, the regulating portion 39d formed on the control plate 39 is
and a stop pin 34a protruding from the second gear 34.
(or 34b) (at this time, the toothless portion 34c (or 34d) provided on the second gear 34 is facing the gear 18) is released, and the second gear 34 is released from the biasing means 51. The gear meshes with the gear 18 of the gear train and rotates (see Figs. 4 and 7).

This rotation of the second gear 34 causes the movable plate 52 (the pin 34 protruding from the front of the second gear 34 to
a is the engaging portion 52a of the moving plate 52 (or 52
b), the magnetic head 49 is rotated (180°) via the lever D53, the slide member 56, and the fan-shaped gear 59. A certain amount of time is required from the start of rotation of the second gear 34 to the end of rotation of the magnetic head 49 (see FIGS. 7 and 18).

By the way, the first gear 33 has the above-mentioned partial tooth section 33.
It rotates due to the engagement of b, and then if there is no missing tooth portion 33d, which is a feature of the present application, the rotation will continue. At this time, the pin 33a provided on the first gear 33 immediately engages with the protrusion provided on the control plate 39 to move the control plate 39 in the forward direction (that is, move the head stand forward). This is not preferable because the head stand is moved forward (in the direction in which the head and tape come into contact) before the rotation of the magnetic head 49b by the second gear 34 is completed.

On the other hand, the pin 33a of the first gear 33 is connected to the control plate 39.
Do not engage with the protrusion and leave it in an idling state.
This is undesirable from the viewpoints of ensuring the stroke of the control plate 39 and ensuring the timing when the first gear 33 moves the head stand forward after the second gear 34 finishes rotating the magnetic head 49.

Therefore, just before the second gear 34 finishes rotating the magnetic head 49, the control section 39d of the control plate 39
The stop pin 34a (or 34b) released from the engagement with the projection 39 provided on the control plate 39 again
c to move the control plate 39 in the reciprocating direction (to the left), and after a certain amount of movement, the first gear 3
The third pin 33a engages with the protrusion 39a of the control plate 39 and takes over the reciprocating movement of the control plate 39.

In addition, until this handover takes place,
Regarding the gear 33, it is necessary to lock the rotation and wait so that the handover can be carried out smoothly.

Therefore, until the rotation of the magnetic head 49 due to the rotation of the second gear 34 is completed, the first gear 33 is provided with a second toothless portion 33d (initial motion (See Figure 18). Note that during this time, the first gear 33 has its pin 33
a is locked to a surface of the control plate 39 located in the thrust direction, opposing the biasing means 35, and rotation is stopped.

That is, the toothless portion 33d located immediately after the initial movement of the first gear 33 is provided with a timing that ensures the advance of the head base by the first gear 33 after the rotation of the magnetic head is completed, and also with the second gear 34. It has the role of sharing the movement stroke of the control plate 39 with the first gear and smoothing the handover.

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

As shown in FIGS. 2, 4, and 17, a prohibition lever 69 is disposed on the left side of the control plate 39, and a prohibition lever 69 is disposed at the lower end of the prohibition lever 69, and the prohibition lever 69 is attached to the rear end bending portion 3a of the chassis 3 at its lower end. 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 6
9 is biased clockwise in FIG. 17 by a coil spring 70. These prohibition levers 69 and coil springs 70 allow the control plate 39 to move backward (move rightward) when it reaches its maximum forward movement position (leftward movement limit position). ) is constituted. On the other hand, as is especially clear from Figure 7,
A protrusion 33f that can be engaged with an engagement protrusion 69b formed on the prohibition lever 69 is formed on the outer circumference of the first gear 33. That is, when the first 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. The state in which the plate 39 is prohibited from moving back is released.

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 movement 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 toothed portion 33b meshes with the gear 16 (a part of the gear transmission mechanism 20), and a toothed portion of the second gear 34 engages the gear 18 (part of the gear transmission mechanism 20). The claw member 51a and the spring member 51b, which serve as biasing means for biasing the second gear in the direction of meshing with the gear transmission mechanism 20 (a part of 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 then the second gear 34 is connected to the gear 18.
Trigger means is configured to engage with the trigger.

As shown in FIG. 2, FIG. 7, FIG. 9, and FIG. 18, a trifurcated start trigger lever 73 is rotatably mounted on the front surface of the central portion of the sub-chassis A11. attached.
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. For more details,
A 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 one end 73a of the start trigger lever 73 protrudes from the front surface. The rotation of the first gear 33 is thereby restricted. A second end 73b formed on the start trigger lever 73 and extending to the right
is engaged with the left end of the lever A12 from the lower surface of the left end. That is, the second end 73b of the start trigger lever 73 is engaged with the end detection lever 10 via the lever A12,
When the end detection lever 10 moves upward, the start trigger lever 73 rotates clockwise in FIG. 18, and the rotation restriction state of the first gear 33 is released. The start trigger lever 73 is a third lever that extends downward.
It has an end 73c, the third end of which engages 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, and is made of a wire plate and has an L-shape as a whole. That is, by moving the magnetic head switching command rod 75 to the left, the start trigger lever 73 is moved to the first position.
It is configured to rotate clockwise in Figure 8. Also, as shown in FIG. 10, a coil spring 76 is disposed near the head switching command rod 75 for applying a rightward bias force to the third end 73c of the start trigger lever 73. . As shown in FIGS. 2, 3, and 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 projects to the right with respect to the solenoid body, and a pin 77b extending in the vertical direction is fitted into the tip of the movable rod. The lower end of the pin 77b 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, by pulling the movable rod 77a of the electromagnetic solenoid 77, the magnetic head switching command rod 75 moves to the left (therefore, the start trigger lever 73 moves to the 18th position).
It is designed to rotate (clockwise in the figure). Also, as shown in Figure 1,
A group of operation switches 79 is arranged on the front side of the housing 2 and to the right of the opening 2a, and one switch in the group of operation switches serves as a switching command switch for activating the electromagnetic solenoid 77. ing. As shown in FIG. 2, FIG. 4, FIG. 10, and FIG. 17, the front surface of the rear end 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 control plate 39. Moving member 8
A projection 81a is provided at the upper end of the left end of the gear 1, 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 moving member 81 for applying a rightward bias force to the moving member.

As is particularly clear from FIGS. 3 and 17,
A lever E83 formed in a T-shape is disposed on the right side of the moving member 81, and is rotatably attached to the rear end bent portion 3a of the chassis 3 at a substantially central portion 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, by moving the moving member 81 to the left, the lever E83 is rotated clockwise in FIG. 17. A second end 8 formed on the lever E83 and extending to the left
A pin 83c extending forward is protruded from the tip of the control plate 3b, and the pin can be engaged with a convex portion 39g and a concave portion 39h formed at the rear end of the control plate 39, respectively. When the pin 83c is engaged with the recess 39h, the control plate 39 can move to its most backward movement position (rightward movement limit position),
Further, when the pin 83c is engaged with the convex portion 39g, 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 3 formed on the control plate
9d is the stop pin 34a, 34 of the second gear 34
b, and the rotation of the second gear is restricted.

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 is fixed. The movable rod 86 of this electromagnetic solenoid 86
The movable rod a projects to the left 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 pin 86b
is pivotally attached to the tip of a third end 83d formed on the lever E83 and extending upward. Further, when the movable rod 86a is in its protruding position (the position shown in FIG. 17), the pin 83c of the lever E83 engages with the rear end protrusion 39g of the control plate 39. The above 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 86a of the electromagnetic solenoid 86 is retracted as the movable member 81 moves to the left. It is fixed in 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 82 biases the moving member 81 to the right.
The movable rod 86a is pulled out by the biasing force of the lever E83, so that the pin 83c of the lever E83
9 engages with the rear end convex portion 39g.

The above-mentioned moving member 81 and coil spring 8
2, lever E83, and coil spring 84
, the electromagnetic solenoid 86, and surrounding small parts related to these, when the power is turned off, the control board 3
A prohibition/cancellation means is configured that prohibits return to the most backward movement position (rightward movement limit position) of No. 9 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 Figures 2, 3 and 9,
A shaft member 30a that swingably supports a support lever 30 that rotatably holds the idler gear 28 serves as a capstan. Note that, as shown in FIG. 10, this shaft member 30a has a fly hole 27.
It also serves as the pivot axis for the rotation. On the other hand, as is particularly clear from FIGS. 3 and 5, a pair of support shafts 89 extending upwardly are provided on the chassis 3 in the vicinity of the capstan 30a. An arm member 91 with a pinch roller 90 rotatably attached to its free end is rotatably attached. The pair of pinch rollers 90 are each detachable from the capstan 30a. A pin 91a that passes through the arm member in the vertical direction is fixed to the free end of the arm member 91, and a magnetic head 4 is attached to the lower end of the left edge of the pin.
Spring 66 for adjusting the azimuth of 9
One end (see, for example, FIGS. 2 and 5) is engaged. This spring 66 allows the arm member 91 to move the pinch roller 90 to the capstan 30a.
is biased in the direction of approaching .

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

The upper end of each pin 91a provided at the tip of the arm member 91 can engage with the front end and rear end of the slide member 56, respectively. More specifically, two notches 56c are provided 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.
The pin 91a of the arm member 91 is inserted into this notch 56c.
As the slide member 56 reciprocates, either one of them can be selectively engaged. A tapered portion 56d is formed at the front edge of the open end of each notch 56c, and a pin 9
1a has a notch 56c formed by this tapered portion 56d.
You will be guided smoothly inside. The pin 91a is the notch 56
By engaging with C, 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, a pair of pinch rollers 90
is selectively detached from the capstan 30a by the reciprocating movement of the slide member 56, which is a component of the head rotation mechanism described above.

As is particularly clear from FIG. 5, mountain-shaped protrusions 47a are formed at both left and right ends of the head stand 47 that supports the slide member 56 so that the pointed portions thereof face each other. Further, a recess 47b is formed on the left side of the protrusion 47a, continuing from the protrusion. When the head stand 47 moves to the right, these protrusions 47a and recesses 47b are formed, for example, by a pin 3 protruding from one swinging end of the support lever 30 shown in FIG.
0d. When the protrusion 47a formed in a mountain shape engages with the pin 30d, the support lever 30 swings in the direction in which the idler gear 28 attached to the support lever separates from the double gear 5f of the reel unit 5, and the protrusion 47a Subsequently, when the recess 47b engages with the pin 30d, the support lever 30 returns to the position where the idler gear 28 meshes with the double gear 5f.

On the other hand, at both the front and rear ends of the slide member 56, there is also a pin 30d for one of the pair of front and rear support levers 30 when the head stand 47 moves to the right.
and the pins are respectively engaged with the recesses 47 of the head stand 47.
A protrusion 56e is formed to prevent the protrusion from entering b. However, each protrusion 56e is attached to the slide member 5.
According to the forward movement and backward movement of 6, only one of the pair of pins 30d is engaged. That is, it is configured to be selectively detached from the reel unit by the reciprocating movement of the pair of idler gears 28 and the slide member 56, which is a part of the head rotation mechanism.

Next, the mechanism for loading the cassette halves will be explained.

As shown in FIGS. 2, 6, and 12 to 14, a sub-chassis B95 is fixed to the upper surface of the right end of the chassis 3. A swinging member A96 extending in the left-right direction is disposed on the chassis 3, and is swingable at its rear end between the sub-chassis B95 and the support protrusion 3d provided at the left rear end of the chassis 3. is attached to. A cassette holder 98 for holding a cassette half is attached to the free end, ie, the front end, of the swinging member A96 so as to be swingable at the center in the front-rear direction. Note that, for example, the position of the cassette holder 98 shown in FIG. 6 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 by the cassette holder. The swinging 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. . Right side member 100
A pin 100a is protruded from the right side of the sub-chassis B95, and the pin 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 F102 is attached to the central lower end of the sub-chassis 95 so that the lever F102 can swing freely at its lower end. The upper end of the lever F is pivotally mounted on a pin 100a. The lever F102 is biased clockwise in FIG.
That is, a coil spring 103 that applies a forward bias force is connected. Right side member 10
A recess 100b that recesses downward is formed in the front end of the cassette holder 98. When the right side member 100 moves rearward when the cassette half is inserted, the pivot shaft 98a of the cassette holder 98 moves into the recess 100b.
00b, 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 urging the swinging member clockwise in FIG. 13. 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 upper surface member 99 of the moving member 101 has a protrusion 99c facing the reel hole 106 of the cassette half to be inserted.
A spring member 99 biases the cassette half so that the protrusion 99c protrudes into the reel hole 106.
d is provided. Note that the protrusion 99c is formed integrally with the upper surface member 99 by stamping or the like. In this way, by integrally forming the protrusion 99c on the upper surface member 99, there is no need to attach special parts to the upper surface member 99 in order to provide the protrusion, and the number of parts and the number of man-hours for attachment are reduced. Efforts are being made to reduce costs.

The upper surface member 99 is also formed with another protrusion 99e that engages with the 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 described above. Note that the protrusion 99e engages with a recess 107 called a label area formed in the cassette half. By thus engaging the protrusion 99e with the recess provided in the cassette half, the engagement state of the protrusion 99e with the cassette half becomes firm.

In the cassette deck, a cassette half is inserted into the cassette holder 98 along its longitudinal direction. Further, the aforementioned control mechanism, ie, the control mechanism for reciprocating the head stand 47 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
The mechanism for performing the operation (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 Sub chassis C1 also shown in Figure 15
11 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 of the longitudinal operation levers, that is, the operation end portions, are spaced apart from each other by a predetermined distance in the left and right directions, and each operation end portion has operation buttons 115 and 116 (the first (shown) is attached. The longitudinal operation lever 113 disposed at the bottom is used to perform FF operation by its forward movement, that is, backward movement, and the longitudinal operation lever 114 provided at the upper position is used to perform REW operation by its forward movement. It is for performing actions. Each of these longitudinal operation levers 11
3 and 114 are arranged above the magnetic head 49. In addition, both longitudinal operation levers 113, 114
are each given a forward bias force 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, there is a longitudinal pin 121 protruding from the left end of the upper surface of the head stand 47.
Tapered portions 113a and 114a are formed at the upper end of the head stand to be engaged with when the head stand is moving to the right. That is, when the head stand 47 is moving to the right, these longitudinal operation levers 113,
By pressing any of 114, the head stand 4
7 is moved to the left by a predetermined amount, thereby causing the magnetic head 49 to separate from the magnetic tape. Furthermore, when the head stand 47 is thus moved to the left by a predetermined amount by operating the longitudinal operation lever, the protrusion 47a formed on the head stand 47 moves the pin of the support lever 30 that holds the idler gear 28. 30d, whereby the idler gear 28 is disengaged from the double gear 5f of the reel unit 5. Although the discussion is a bit off topic, for example, as shown in FIGS. 3 and 9, a pair of claw members 123 are provided on the chassis 3 to prevent the reel unit 5 from rotating in the opposite direction. When the head stand 47 moves, the right end of the head stand 47 engages with the claw member 123 and pushes it open, and the reel unit 5 is moved by the claw member.
The reverse rotation prevention state is released.

Returning to the original topic, as shown in FIGS. 2, 3, and 16, a plate 124 is located at the rear end and right side of the bent portion 3f formed at the left end of the chassis 3 in the front-rear direction. It is movably attached to the Upper end protrusion 124a of plate 124
A coil spring 125 is connected to the plate to apply a forward bias force to the plate. A T-shaped lever H126 is rotatably attached to the front end of the plate 124 at its center. In particular, as is clear from FIG. 16, on the front edge of the first end 126a formed on the lever H126 and extending downward, there is a protrusion 11 that extends downward and protrudes from the longitudinal operation lever 113 described above.
The rear edge of 3c is brought into contact. Further, at the front edge of the second end 126b formed on the lever H126 and extending upward, another longitudinal operation lever 114 is provided.
A rear edge of a protrusion 114c extending substantially leftward is brought into contact with the protrusion 114c. 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 left bent part 3 of the chassis 3 is located at the central bent part of the lever 1129.
It is rotatably attached to f. Lever 11
29 and extends rearwardly.
A pin 129b is protruded from the tip of the lever H126, and this pin 129b is slidably fitted into a long hole 126d formed in a third end 126c that extends forward and is formed in the lever H126. There is. Also,
The second end 129c of the lever 1129 extends downward.

As shown in FIGS. 2, 3, 10, and 16, a swing lever 1 is placed between a pair of reel units 5 and a flywheel 27, respectively.
30 is arranged to extend in the left-right direction, and is swingably attached to the chassis 3 via a pin 130a at a substantially central portion thereof. Swing lever 13
The left end of the lever 1129 is the second end 129c of the lever 1129.
It is pivotally attached to the tip of the. 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. The gear 132 which is the first stage gear of the gear transmission mechanism can mesh with each gear part 27a of the pair of flywheels 27, and the gear 134 which is the final stage gear can mesh with the small diameter gear part formed in the double gear 5f of the reel unit 5. They are designed to fit together. Namely. When the longitudinal operation levers 113 and 114 are pressed, the swinging lever 130 is moved via the lever H126.
The second end portion 129c of the reel unit 5 swings forward and backward, whereby the reel units 5 disposed at the rear and front are alternatively rotated at high speed.

As shown in FIGS. 2, 7, 15, and 16, on the sub-chassis 111 that holds the longitudinal operating levers 113 and 114, there are provided An intermediate lever 138 is provided that can reciprocate in the direction of movement of the operating lever (front-back direction). A coil spring 139 is connected to the intermediate lever 138 to apply a forward bias force to the intermediate lever. As is particularly clear from FIG. 15, a pin 13 is provided on the lower surface of the rear end of the intermediate lever 138.
A protruding pin 8a is provided, and the pin is slidably engaged in a long hole 140 formed in the longitudinal operation levers 113, 114 so as to extend in the front-rear direction in correspondence with the pin. A pin 13 is located on the right end side of the central part of the elongated hole 140.
A recess 140a into which the holder 8a can be inserted is formed. Here, the intermediate lever 138 is designed to be able to 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. It is also biased counterclockwise in FIG. That is, when both the longitudinal operation levers 113 and 114 are simultaneously moved forward (move backward), the pin 138a of the intermediate lever 138 fits into the recess 140a of the elongated hole 140, thereby causing the intermediate lever 138 to move backward. It is configured to move to. However, if only one of the pair of longitudinal operating levers 113, 114 is moved forward, the rear right edge 1 of the long hole 140 formed in the other longitudinal operating lever
Since 40b is still in contact with pin 138a,
The intermediate lever 138 does not move forward (move backward). Although not described in detail, when either the longitudinal operating lever 113 for FF operation or the longitudinal operating lever 114 for REW operation is moved forward, it is locked in the forward position. A mechanism is provided to do so. The locking mechanism also locks the longitudinal operating lever in the forward 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 longitudinal operation levers is swung clockwise in FIG.
3 is made to work.

For example, as is clear from FIGS. 2 and 7, a pin 13 is provided on the upper surface of the rear end of the intermediate lever 138.
8d is provided protrudingly, and the pin is connected to the swinging member 96.
(for example, as shown in FIG. 6). This intermediate lever 138 is used to press the swinging member 96 rearward by moving forward, and move the cassette holder 98 from the above-mentioned lowered position to the raised position.

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

As is clear from FIGS. 2 and 6, a bracket 146 is attached to the right end surface of the subchassis B95, 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. Further, the switch 148 is for operating the motor 24. Both switches 147 and 148 are mechanically actuated upon insertion of the cassette half into the cassette holder 98.

As shown in Figures 2, 7, and 18, the front left end of the subchassis A11 has an FF mark.
A switch 149 for switching REW is permanently installed. This switch 149 is connected to the moving plate 52 (first
(Fig. 8) is engaged.

Further, as shown in FIG. 15, a switch 150 is fixed on the sub-chassis 111 to cut off the power supply to the cassette deck.
The switch operates when the intermediate lever 138 is moved forward (moved rearward).

The operation of the cassette deck configured as described above is explained in the 19th section.
The operation procedure will be briefly explained with reference to FIGS. 26 to 26.

First, the cassette half 155 (shown in FIG. 19) is inserted through the opening 2a of the housing 2 shown in FIG. 1, and the cassette half is held in the cassette holder 98 as shown in FIGS. 19 to 21. As shown in FIG. 20, as the cassette half 155 is inserted into the cassette holder 98, the right side member 100 moves rearward,
As a result, the pivot shaft 9 of the cassette holder 98
8a falls into the recess 100b of the right side member 100, and the cassette holder is moved to the lowered position.
The cassette half is then set at the playing position. Along with this cassette half insertion operation, switches 147 and 148 shown in FIG. 6, for example, are operated, power is turned on to the cassette deck, and the motor 24 starts rotating. When the motor 24 rotates, as shown in FIG.
The small pulley 24a moves in the direction of arrow M, and pulley 2
3 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 are moved in the directions of arrows Q and R (first direction) through the pair of idler gears 28, respectively.
0 (shown)). In this way, since the pair of reel units 5 rotate in opposite directions, slack in the magnetic tape in the cassette half 155 is wound up. When the slack in the magnetic tape is wound up and a predetermined tension is applied to the magnetic tape, the first
Of the constituent members of the reel unit 5 shown in Fig. 1, all members except the double gear 5f are fixed by the reaction force of the tension, and only the double gear 5f is It continues idling through 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.
It is rotated counterclockwise in FIG. 18 via the gear transmission mechanism 20. Therefore, as the end detection gear 14 rotates, the pin 10b protruding from the end detection lever 10 is moved to the top of the mountain-like protrusion 14b of the end detection gear. Here, as is clear from the above, the arm 5i of each reel unit 5 is stopped. Therefore,
The intermediate lever 7 is not activated, and the pin 10b of the end detection lever 10 does not continue sliding along the mountain-shaped 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, and thereby 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 rotation of the first trigger lever 73, whose rotation was restricted due to the engagement of the pin 33a with one end of the start trigger lever 73, is reduced.
The gear 33 becomes rotatable, and the coil spring 3
It is rotated clockwise in FIG. 18 by the biasing force 5. Therefore, the partial tooth portion 33b of the first gear 33 meshes with the gear 16, and the first gear begins to rotate. By the rotation of the first gear 33, the 17th
The control plate 39 shown in the figures is moved to the left,
Therefore, the head stand 47 moves to the right as shown in FIG. 22, and the magnetic head 49 comes into contact with the magnetic tape. In addition, the most forward movement position (leftward movement limit position)
When the control plate 39 reaches this point, the engagement recess 69a of the prohibition lever 69 engages with the pin 39e protruding from the control plate, thereby inhibiting its return movement (movement to the right). Along with the above rotation of the first gear 33,
Similarly, the moving member 81 shown in FIG.
3. It is moved to the left as shown in the figure. Therefore, the lever E83 rotates clockwise as shown in FIG. 23, and the movable rod 86a of the electromagnetic solenoid 86, which has already been turned on, is pushed in. By this operation, the pin 83c of the lever E83 comes off the convex portion 39g formed on the right end of the control plate 39 and engages with the concave portion 39h (FIG. 17).
Therefore, the control plate 39 can be moved to the most backward movement position (rightward movement limit position). Further, the pin 3 of the control plate 39 is inserted into the engagement recess 69a of the prohibition lever 69.
9e enters, the prohibition lever 69 is rotated by a predetermined amount in the clockwise direction 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.
7 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. Note that this operation is performed by the protrusion 47a and recess 47b formed on the head stand 47.
This depends on the interaction with the protrusion 56e provided on the slide member 56, but since it was described in detail in the previous explanation of the configuration, it will not be described in detail here. Also, the 22nd
As shown in the figure, as the head stand 47 moves to the right, the rear pinch roller 90 touches the capstan 30.
The other pinch roller 90, that is, the front pinch roller 90, is held in a state separated from the corresponding capstan. This is because the pin 91a protruding from the arm member 91 that supports the front pinch roller 90 is fitted into the notch 56c of the slide member 56. As also shown in FIG. 22, by moving the head stand 47 to the right,
A pair of claw members 1 that were engaged with the reel unit 5
23 is removed from the reel unit.

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

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

When the switch for changing 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, the start trigger lever 73 is rotated clockwise in FIG. 18 via the magnetic head switching command rod 75 (FIG. 10). As a result, the first gear 33, whose rotation was restricted by the start trigger lever, becomes rotatable, and is rotated clockwise in FIG. 18 by the biasing force of the coil spring 35. Therefore, the first
The partial tooth portion 33b of the gear 33 meshes with the gear 16,
The first gear starts rotating. Immediately after the first gear 33 starts rotating, the protrusion 33 protruding from the first gear
f engages with the engagement protrusion 69b of the prohibition lever 69 (see FIG. 17) to rotate the prohibition lever counterclockwise in FIG. 17. Then, the engagement recess 69a and the pin 39e of the control plate 39 are connected to the inhibit lever.
The engagement state with the control plate 39 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. By returning the control plate 39 to the most backward position, the head stand 47 moves to the left, and the magnetic head 49 is separated from the magnetic tape.

When the control plate 39 is at the most forward movement position (leftward movement limit position), the stop pin 34a of the second gear 34 is engaged with the restriction portion 39d (for example, shown in FIG. Figure 17),
Rotation of the second gear 34 is restricted. control board 3
9 returns to the most backward movement position described above, this restriction is released, and for example, the claw member 5 shown in FIG.
1a and the spring member 51b, the second gear 34 is rotated clockwise in FIG. 18. Therefore, the toothed portion of the second gear 34 is the gear 1.
8, and the second gear starts rotating. As the second gear 34 rotates, the stop pin 34a protruding from the second gear engages with the claw portion 52a of the movable plate 52, and the movable plate is moved to the left and connected to the movable plate. magnetic head 4
9 can be rotated 180° to the REV side. In addition, the switch 149 is activated by moving the moving plate 52 to the left.
Can be switched from FWD side to REV side.

Due to the above 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 held in a predetermined position by the stop pin. Moved to the left by a distance. When the second gear 34 completes its 180° rotation, the stop pin 34a separates 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. At this time, the control plate 39 is moved to the forward movement 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.
Further, the meute switch 143 is also turned off in the same manner as described above.

Furthermore, 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 and the rear idler gear 28 is disengaged from the reel unit 5 and moved forward. The idler gear 28 is engaged with the reel unit 5, and only the front reel unit 5 starts rotating. In addition, 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 pin 34b of the second gear 34 is connected to the claw portion 52b of the moving plate 52.
The operation of switching the tape transport direction from the FWD side to the REV side is substantially the same as described above, except that the moving plate is engaged with the moving plate (shown in FIG. 18) to move the moving plate to the right, and will not be described in detail.

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

For example, when tape transport to the FWD side is completed, a predetermined tension is applied to the magnetic tape at the end, and the first
Of the constituent members of the reel unit 5 shown in FIG. 1, all members except the double gear 5f are fixed by the reaction force of the tension. Then,
Only the double gear 5f continues to idle with respect to these fixed members via the felt plate 5h.
When the tape is being fed to the FWD side,
The above-mentioned fixed members group are also rotating except for the arm member 5i. Further, the arm member 5i receives a biasing force caused by rotational force, and biases the intermediate lever 7 via the floating lever 8 in the counterclockwise direction in FIG. 22. As a result, the end detection lever 10 to which the rear end of the intermediate lever is pivotally connected is moved to the first end detection lever 10.
The pin 10b, which is urged to rotate counterclockwise in FIG. 8 and protrudes from the end detection lever, slides while contacting the mountain-like protrusion 14b of the end detection gear 14, and contacts the protrusion 14c of the end detection gear. pin 10b
is never engaged. 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 14c of the end detection gear 14 presses against the pin 1 of the end detection lever.
0b. 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 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 automatic switching of the tape transport direction from the REV side to the FWD side is performed in the same manner as the above operation, and will not be described in detail.

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

For example, when performing an FF operation during tape playback, the longitudinal operating lever 113 for FF operation is pushed and moved rearward, as shown in FIGS. 24 and 25. Then, the mute switch 143 is turned on via the lever J142. Further, the longitudinal pin 121 protruding from the left end of the head stand 47 is pressed 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. The contact between the magnetic head 49 and the magnetic tape is loosened.

As is clear from FIG. 25, as the longitudinal operating lever 113 moves backward, the lever H126 that engages with the protrusion 113c of the longitudinal operating lever moves to the 25th position.
It is swung counterclockwise in the figure. Therefore, the lever I129 similarly swings clockwise in FIG. 25, and as a result, the swinging lever 130 pivots counterclockwise in FIG. 26 about the pin 130a as shown in FIG. do. Therefore, the first stage gear 132 of the gear transmission mechanism 135 provided on the swing lever meshes with the gear portion 27a of the rear flywheel 27, and the final stage gear 134 engages with the double gear 5f of the rear reel unit 5. It meshes with the small diameter gear part. On the other hand, the pair of idler gears 28 are separated from the reel unit 5 by moving the head stand 47 to the left by pushing the longitudinal operating lever 113. Therefore, the rear reel unit 5 rotates at high speed, and the tape is rapidly forwarded.

When performing the REW operation, this is done by pushing the longitudinal operating lever 114 for REW operation. That is, the protrusion 11 of the longitudinal operation lever 114
4c engages with the second end 126b of the lever H126, and the lever H is rotated clockwise in FIG. It meshes with the unit. The head stand 47 is moved to the left by the tapered portion 114a of the longitudinal operation lever 114 engaging with a longitudinal pin 121 provided on the head stand 47.

When ejecting the cassette half after tape playback is complete, use the longitudinal operation lever 1 for FF operation.
13 and the longitudinal operation lever 114 for REW operation at the same time. By simultaneously pressing the two longitudinal operating levers, the intermediate lever 138 (for example, shown in FIG.
(for example, as shown in FIG. 6). 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. Also, for example, the 24th
Since the switch 150 shown in the figure is also operated, the electromagnetic solenoid 86 (see FIG. 23) 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. As a result, the control plate 39 is prohibited from returning to the most backward movement position (rightward movement limit position). That is, the stop pin 34 of the second gear 34
a remains engaged with the regulating portion 39d of the control plate 39, and when the power is turned on again, the second gear 34 does not rotate, and the tape transport direction is unnecessarily switched. This means that they are prevented from being exposed.

Incidentally, as mentioned above, the electromagnetic solenoid 86 described above
The off operation is also performed when the key of the automobile in which the cassette deck is installed is turned off.

Effects of the Invention As detailed above, the cassette deck according to the present invention includes a head stand drive mechanism including a first gear 33 for reciprocating the head stand 49 which is movable in a direction substantially perpendicular to the tape transport direction;
A head rotation mechanism including a second gear 34 for rotating the magnetic head 49, which is rotatably provided around an axis substantially parallel to the direction of movement of the head stand, and a head rotation mechanism that meshes with each other and is driven by a single drive source. and a starting means for selectively meshing the first gear and the second gear with the gear train, the first gear and the second gear are selectively rotated. .

Therefore, if you try to make the reciprocating movement of the head stand and the rotational movement of the head with one gear,
First, it is necessary to ensure a stroke for retracting the head stand (away from the magnetic tape) and then a stroke for rotating the head, and both strokes must be accomplished in a serial relationship. When the slide member is moved by the rotation of the slide member to achieve both strokes, the movement stroke becomes large and the device becomes large as a result. However, as in the present invention, separate gears are used to separate the head stand When performing reciprocating motion and rotational motion of the head, the two strokes are in a parallel relationship, and the size of the device can only be adjusted by the movement stroke of one of the two strokes controlled by each slide member. is determined, and as a result, the device can be made smaller.

In addition, the head stand drive mechanism is separated into a head stand drive mechanism having a first gear and a head rotation mechanism having a second gear, each of which uses these separate gears (first gear and second gear) as a starting point, and the first gear rotates. By providing a trigger means that rotates the second gear after the magnetic head is rotated, the magnetic head rotates after the head base moves backward and the magnetic head is completely separated from the magnetic tape. This prevents damage 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 caused to move forward by the rotation of the first gear, and is moved forwardly by the rotation of the first gear. The control plate 39 includes a control plate 39 formed with a regulating portion 39d that engages stop pins 34a and 34b protruding from the second gear to regulate rotation of the second gear when the second gear is not in the moving position. is provided with a protrusion 39c that engages with the stop pin so that the control plate can also be 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, in order to ensure the stroke necessary for the operation of the control plate using only the first gear, the diameter of the first gear must be made considerably large.
As a result, the cassette deck as a whole becomes larger. In the cassette deck according to the present invention, the control plate is also moved forward by the second gear, and the stroke is ensured by the interaction of the first and second gears, thereby keeping the diameters of both small. -ing Therefore, it is becoming easier to downsize the cassette deck as a whole.

Further, in the cassette deck according to the present invention, the first gear 33 has missing teeth 33d in a predetermined range at a portion that should mesh with the gear transmission mechanism immediately after the first gear starts moving.

With this configuration, the operation when the tape playback direction is reversed is as follows.

Initial movement of the first gear 33 → Release of prohibition of backward movement on the control board →
The control plate moves to the most backward position (=magnetic head 49 detaches from the magnetic tape) → rotation restriction of second gear 34 is released → second gear rotates (=magnetic head rotates) → second
The rotation of the gear causes the control plate 39 to move forward (=the magnetic head 49 approaches the magnetic tape) → the first gear is provided with the toothless portion, and the first gear is connected to the gear transmission mechanism. Due to the interaction with the fact that the gear is biased by the biasing means in the meshing direction, the first gear 33 instantaneously rotates by the portion of the missing tooth, and the second gear 34 is caused to move forward. Taking over the forward movement of the control plate, the control plate is moved to the most forward movement position. In other words, since the first gear instantly catches up with the forward movement of the control board by the second gear and causes the control board to move forward, wasted time can be saved and the listener will not feel frustrated. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the entire cassette deck according to the present invention, Fig. 2 is an exploded perspective view of the internal structure of the cassette deck, Figs. 3 to 8 are partial detailed perspective views of the internal structure, and Fig. 9. 10 are plan and rear views of the internal structure, FIGS. 11 to 18 are diagrams showing details of the internal structure, and FIGS. 19 to 26 are diagrams for explaining the operation of the cassette deck. It is a diagram. Explanation of symbols of main parts, 1...Cassette deck, 2...Housing, 2a...Opening, 3...
Chassis, 3a, 3f...bending part, 3c, 5m,
56a, 95a, 126d, 140...long hole, 3
d...Support protrusion, 5...Reel unit, 5a...
...Rotation shaft, 5b... Reel, 5c... Collar,
5d... Bush, 5e... Expanded diameter part, 5f... Double gear, 5g, 5l, 30b, 35, 40, 4
1,60,70,76,82,84,103,1
04,118,119,125,139...Coil spring, 5h...Felt plate, 5i...Arm, 5j, 5k...Washer, 7...Intermediate lever, 7a, 8a, 8b, 10b, 30d, 33
a, 39e, 44a, 77b, 83c, 86b,
91a, 100a, 129b, 130a, 138
a, 138d...pin, 7b, 64a...opening, 7c, 56c...notch, 8...idling lever, 10...end detection lever, 10a, 14
c, 33f, 39a, 39b, 39c, 42a,
47a, 49a, 56e, 81a, 99c, 99
e, 113c, 114c...Protrusion, 11...Sub chassis A, 12...Lever A, 14...End detection gear, 14a, 39h, 47b, 100b,
140a...Protrusion, 14b...Protrusion, 16,1
7, 18, 19, 61, 132, 133, 134
... Gear, 20,135 ... Gear transmission mechanism, 22
...Worm, 23...Pulley, 24...Motor, 24a...Small pulley, 25...Belt, 27
... Flywheel, 27a, 27b ... Gear part, 28 ... Idler gear, 30 ... Support lever, 30a ... Capstan, 33 ... First gear, 33b ... Partial tooth portion, 33c, 33d, 34
c, 34d... Missing tooth portion, 34... Second gear, 34
a, 34b...stop pin, 36,124...
Plate, 39... control board, 39d... regulation section,
39g...Protrusion, 42...Lever B, 44...Lever C, 47...Head stand, 49...Magnetic head, 51a, 123...Claw member, 51b, 99d
... Spring member, 52 ... Moving plate, 52a,
52b...Claw portion, 53...Lever D, 54, 66
... Spring, 56 ... Slide member, 56
d, 113a, 114a...Tapered portion, 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, 73
b, 83b, 126b, 129c... second end,
75... Magnetic head switching command rod, 77, 86
...Electromagnetic solenoid, 77a, 86a...Movable rod, 79...Operation switch group, 81...Moving member, 83...Lever E, 83a, 126a, 12
9a...first end, 89, 138b...support shaft,
90...Pinch roller, 91...Arm member, 9
5... Sub chassis B, 96... Swinging member, 96
a...Left end portion, 98...Cassette holder, 98a
... Swing shaft, 99 ... Top member, 100 ... Right side member, 101 ... Moving member, 102 ... Lever F, 106 ... Reel hole, 107 ... Recess, 11
1...Sub chassis C, 113, 114...Longitudinal operation lever, 115, 116...Operation button, 1
21... Longitudinal pin, 124a... Upper end protrusion, 1
26...Lever H, 129...Lever I, 130
... Swinging lever, 138 ... Intermediate lever, 140
b... Rear right edge, 142... Levy J, 143
...Miyuto Switch, 146...Bracket,
147, 148, 149, 150...Switch,
155...cassette half.

Claims (1)

[Scope of Claims] 1. A head stand capable of reciprocating in a direction substantially perpendicular to the tape transport direction, and a head stand on the head stand between two angular positions about an axis 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. and a head rotation mechanism including a second gear that rotates the magnetic head by rotation, the gear train meshing with each other and being driven by a single drive source; activating means for selectively meshing the first gear and the second gear with the gear train; and trigger means for causing the second gear to mesh with the gear train after the first gear meshes with the gear train. and the trigger means is provided so as to be able to reciprocate between a forward position and a backward position corresponding to a position in which the head stand is advanced relative to the tape, and is configured to be able to reciprocate by rotation of the first gear. a control plate formed with a restriction portion that engages with a stop pin protrudingly provided on the second gear to restrict rotation of the second gear when the second gear is moved forward and is not at the most backward movement position; urging means for urging the plate in the backward movement direction; and for prohibiting the backward movement of the control plate when the control plate reaches the maximum forward movement position, and canceling the prohibition by the initial movement of the first gear. the prohibition means designed to do so, and the first
and a biasing means for biasing the second gear in the direction of meshing with the gear train, and the control plate is provided with a protrusion that causes the control plate to move forward by engagement with the stop pin, and A cassette deck characterized in that, as part of a starting means, the first gear is provided with a predetermined range of missing teeth for disengaging the first gear from meshing with the gear train immediately after the first gear starts moving.