JPS6182314A - Cassette deck - Google Patents

Abstract

PURPOSE:To make a cassette deck small-sized and restart reproducing in the state before power-off by using the same driving source for the first gear which drives a head base and the second gear which rotates a magnetic and inhibiting return of a control plate engaged with the second gear when a power source is turned off. CONSTITUTION:The head base is so provided that is 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 provided with a control plate 39 provided with a control member which is moved forth by turning of the first gear and is engaged with the second gear to control turning, a coil spring 40, and an inhibiting lever 69, and return of the control plate 39 to a maximum return position is inhibited when the power source is turned off. Thus, the cassette deck is made small- sized, and reproducing is restarted in the state before power-off.

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.

In addition, when playing back a 4-track magnetic tape that has been recorded in both forward and reverse directions, it is normal to flip the cassette half and replace it when playback in one direction is completed, but this replacement is troublesome. A cassette deck with a built-in so-called auto-reverse 11 structure has been developed to solve this problem. As is well known, the auto-reverse mechanism automatically reverses the magnetic tape and sets the magnetic head to match the tracks in both forward and reverse directions.

Various configurations for switching the magnetic head between forward and reverse directions have already been proposed. For example, when reproducing a 41-rack magnetic tape, four channels of magnetic heads are provided and two of the four channels are switched between forward and reverse directions of the magnetic tape. There is a type in which the magnetic head is electrically switched according to the forward and reverse running of the tape, and a type in which a two-channel magnetic head is provided and the main body of the magnetic head is mechanically translated or rotated in accordance with the forward and reverse running of the tape. Among these various magnetic head switching formats, the magnetic head A format in which the image is rotated is adopted.

In the magnetic head rotation type, the magnetic head is moved in a direction approximately perpendicular to the -H tape transport direction to separate the magnetic head from the magnetic tape and then rotated, and then the magnetic head is moved back to read the magnetic tape. Abutment against the tape is performed.

The already developed cassette deck has a drive vJm 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 problems, and its object is to provide a cassette deck that is easy to downsize as a whole and is inexpensive.

The cullet 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 mounted 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. A head stand including 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. Drive? 1!4M, and a head rotation mechanism including a second gear for rotating the magnetic head with a rotational speed of J:
and a rotational force applying mechanism that includes a gear transmission IJt1M that can mesh with a second gear and applies rotational force from a single drive source to the first and second gears, wherein the first gear is connected to the gear transmission mechanism. A trigger means is provided for causing the second gear to mesh with the gear transmission mechanism after the second gear is engaged, and the trigger means is provided to be able to reciprocate between a forwardmost position and a most backward position. a control plate formed with a regulating portion that engages with the second gear to restrict the rotation of the second gear when the gear is moved forward by the rotation of the gear and is not in the most backward movement position; and the control plate is biased in the backward movement direction (=l force means, which prohibits the backward movement of the control plate when the control plate reaches the maximum forward movement position, and releases the prohibition by the initial movement of the first gear. and an urging means for urging the first and second gears in a direction in which they mesh with the gear transmission mechanism, and the control plate is placed in the forwardmost position when the power is turned off. The device is characterized in that it is provided with a prohibition/cancellation means for prohibiting a return to the state and canceling the prohibition when the power is turned on.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cassette deck as an embodiment of the present invention will be described below 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, inside the housing 2 is a chassis 3 made of a steel plate or the like.
has been installed. 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, and are rotatably mounted on the chassis. As is clear from FIG. 11, the reel unit 5 has a rotating shaft 5a fixed to the chassis 3.
have. A reel 5b is rotatably fitted onto the rotation support shaft 5a. A collar 50 and a bush 5d are fitted to the upper and lower ends of the reel 5b, respectively. The collar 50 can be fitted into a 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 there are two large and small diameter portions between the enlarged diameter portion and the bush 5d.
A double gear 5r having two gear portions is arranged, and is rotatably attached to the rotation support shaft 5a.

A coil spring 5g is interposed between the double gear 5r and the bush 5d to bias the double gear and the bush in a direction to separate 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 part 5e and is slidably in contact with the double gear 5''.An arm 51 is provided between the upper surface of the enlarged diameter part 5e and the collar 50. , is rotatably attached to the outer periphery of the reel 5b at one end thereof.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. A coil spring 5Q is arranged between the upper washer 5 and the arm 51 to bias the arm downward.

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

The floating lever 8 has bottles 8b protruding from both ends thereof, and each bottle is slidably engaged in a long hole 5m formed at the free end of the arm 51 of the reel unit 5. ing. As shown in FIGS. 7 and 18, an end detection lever 10 is disposed near the rear end of the intermediate lever 7. As shown in FIGS. The end detection lever 10 is connected to a sub-chassis A1 which is fixed to the upper surface of the rear end of the chassis 3 and protrudes upward.
one end of a lever A12 rotatably provided on the lever A12;
In this case, it is attached to the right end of the lever A so as to be pivotable at its upper end. A projection 10a extending downward is provided at the lower end of the end detection lever 10, and the projection is slidably engaged with a notch 7C formed at the rear end of the intermediate lever 7.

As shown in FIGS. 7, 9, and 18, a bin 10b is 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 140 having the same shape are formed in the center of the four parts 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
The diameters of these gold circles are approximately the same size. The bottle 10b protrudingly provided on the end detection lever 10 can engage with these protrusions 14b and 14c.

- Part of a tape end detection mechanism for detecting the end of a magnetic tape being played by the above-mentioned reel unit 5, intermediate lever 7, floating lever 8, end detection lever 1o, and end detection gear 14 is configured.

As shown in FIG. 2, FIG. 7, FIG. 9, and FIG.
On the left side, there are four gears meshing in series '16.17.
A gear transmission mechanism 20 consisting of gear transmission mechanisms 18 and 19 is provided, and the end detection gear 14 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) is rotatably mounted on the subchassis A11 (=Jl). It meshes with the worm 22. A pulley 23 is integrally formed at the lower end of the worm 22. As shown in FIG.
3 is rotationally driven via a belt 25 by a motor 24 disposed at the right rear end of the chassis 3 . Note that the belt 25 is connected to a small pulley 24 fitted to the output shaft of the motor 24.
It is routed directly to a.

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

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

As shown in FIGS. 2, 7, 9, and 18, a first gear 33 and a second gear 34 are rotatably mounted on the contact surface of the subchassis A11 above the gears 16 to 19. installed. 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 gear transmission mechanism 20, the worm 22, the pulley 23, the bell mill 25, etc. drive the motor 24 as a single drive source to the first gear 33 and the second gear 34.
A rotational force applying mechanism is configured to apply a rotational force (=J from A granting means is configured.

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. 18. One end of a coil spring 35 is hung. The other end of the coil spring 35 is hung on a plate 36 fixed to the tip of the rotation support shaft (not shown) of the gears 16 and 18.

As shown in FIGS. 2, 3, 9 and 11, a bent portion 3a extends upward in parallel with the sub-chassis A11 at the rear end of the chassis 3, that is, at the rear of the sub-chassis A11.
is formed. As shown in FIG. 4, three control plates made of rope plates are attached to the front surface of the bent portion 3a so as to be movable in the left-right direction. The movement limit position of the control plate 39 in the left direction is referred to as the most forward movement position of the control plate, whereas the movement limit position in the right direction is called the most return movement position. is a coil spring 4 that urges the control plate to the right, that is, in the backward movement direction.
0 is concatenated. Approximately in the center of the control plate 39 and at the upper end is a protrusion 3 that can be engaged with the pin 33a of the first gear 33.
9a is formed. The projection 39a engages with the bin 33a at its right edge, and therefore the control plate 39
is caused to move forward by the rotation of the first gear 33. As shown in FIGS. 2, 4 and 10,
Below the control plate 39 are the control plate and a coil spring 41.
A lever B42 is disposed that is connected to the control plate via the control plate and moves to the left as the control plate moves forward. A protrusion 42a is formed at the right end of the lever B42 and engages with the right edge of 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.
As the lever B 42 moves back, the lever B 42 also returns to the right. As is clear from FIGS. 2, 8, and 10, the left end of the lever B42 is provided on the lower surface of the chassis 3 so as to extend back and forth, and is rotatable at its center via the bin 44a. It is pivotally connected to the rear end of a lever C44 attached to the chassis 3. This lever C47I
The front end portion of is pivotally attached to a head stand 47 provided on the chassis 3 so as to be able to reciprocate in the left-right direction. Note that the magnetic tape is driven in the front-rear direction, and therefore, the moving direction of the head stand 47 is approximately perpendicular to the tape transport direction.

The 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 bins 34a and 34b are protruded from the rear surface with a pitch of 180°, and one stop bin 34a passes through the second gear so as to also protrude from the front face of the second gear. are doing. In addition, both stop bins 34.
a and 34b can be engaged with the right edge of a protrusion 390 protruding from the upper end of the rear end of the control plate 39. That is, the control board 39 can be moved forward and backward to both stop bins.

Further, a pawl member 51a and a spring member 511) are provided near the second gear 34, and the second gear 34 is biased in the closing direction in FIG. 18 by the pawl member and spring member. As shown in FIG. 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.A second gear 34 is attached to the right end of the movable plate 52. Claw portions 52a and 52b are formed which can engage with the stop bin 34a protruding from the front surface of the holder.The claw portion 52a engages with the stop bin 34a at its right edge, and the claw portion 52b engages with the stop bin 34a at its left edge. The movable plate 52 is adapted to engage with the stop pin 34a at its edge.That is, the movable plate 52 reciprocates as the second gear 34 rotates 180 degrees in one direction.

As shown in FIG. 2, FIG. 3, and FIG. The lever D53 is rotatably attached to the upper surface of the chassis 3 at a bent portion.The lever D53 is click-biased by a spring 54 (see FIG. 3).The left end of the movable plate 52 The front end of the lever D53 is pivoted to the rear end of the lever D53.The front end of the lever D53 is attached to a slide member 56 (
(also shown in FIG. 5).

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

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

That is, the fan-shaped gear 59 swings as the slide member 56 reciprocates. 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 movement, and the second gear 34
The magnetic head 49 rotates 180 degrees, causing the magnetic head 49 to rotate 180 degrees.
It is designed to rotate by 0°.

Here, the azimuth adjustment means for regulating the angle of the magnetic head 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 64 are positioned so as to sandwich the magnetic head 49 from the front and back, and both ends are bent into a U-shape, with the lower side of the U-shape being magnetically -21- protruding from the outer periphery of the head 49
' Rotation of the magnetic head 49 is restricted by engaging with the protrusion 49a.

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 64.

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 forming the above-mentioned regulating member into a single member having a front-back symmetrical shape, the number of parts is reduced and the number of assembly steps is also reduced, contributing to cost reduction.

The story goes back and forth, but for example, as shown in FIG. 18, the first gear 33 is provided with two missing tooth portions 33c and 33d symmetrically with respect to a partial tooth portion 33b having approximately three teeth. . When the first gear 33 is in 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 is connected to the gear by a start trigger lever to be described later. 16 is prohibited. On the other hand, the second gear 34 also has two toothless parts 34C and 34. with a 180° bit. d is formed, and when the second m-th wheel is in an actuated rest state, the toothless portion 340 corresponds to the gear 18 (a part of the gear transmission mechanism 20), and as described later, the toothed portion 340 corresponds to the gear 18 (a part of the gear transmission mechanism 20). is gear 18
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, a prohibition lever 69 is disposed on the left side of the control plate 39, and its lower end is pivoted to the rear end bent portion 3a of the chassis 3. It is attached so that it can move freely.

The prohibition lever 69 has 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 provided with a coil spring 7o.
is biased clockwise in FIG. 17. These prohibition levers 69 and coil springs 70 prevent the control plate 39 from moving backward (rightward movement) when the control plate 39 is moved forward and reaches its maximum forward movement position (leftward movement limit position). A prohibition means is 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 state in which the return movement is prohibited is canceled.

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
The second gear 34 includes a coil spring 35 as a biasing means for biasing the first gear in a direction in which the partial gear 3.3b meshes with the gear 16 (part of the gear transmission mechanism 2, O). The tooth portion is a claw member 51 as a biasing means for biasing the second m wheel in a direction in which it meshes with the gear 18 (part i of the gear transmission mechanism 20).
a, the spring member 51a, and surrounding small members related thereto, when the first gear 33 and the second gear 34 start rotating, the second gear 34 is shifted into gear after the first gear 33 meshes with the gear 16. Trigger means is configured to engage with 18.

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 is connected to one end of the start trigger lever 73. The portion 73a is adapted to engage with this portion protruding from the front, thereby restricting the rotation of the first gear 33.The portion 73a is formed on the start trigger lever 26-73 and extends to the right. The second end portion 73b engages with the left end portion of the lever Δ12 from the lower surface of the left end portion.In other words, the second end portion 73b of the start trigger lever 73
b is engaged with the end detection lever 10 via the lever AI2, and when the end detection lever 10 moves upward, the start trigger lever 73 rotates clockwise in FIG. The state in which the rotation of the first gear 33 is restricted is released. The start trigger lever 73 has a third end 73C that extends downward.
The third end is engaged 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, and is made of a steel plate and has an L-shape as a whole. That is,
When the magnetic head switching command rod 75 moves to the left, the start trigger lever 73 is configured to rotate clockwise in FIG. 18. Also, as shown in FIG. 10, a coil spring 6 is disposed near the head switching command rod 75 to apply a rightward bias to the third end 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. Electromagnetic solenoid 7
The movable rod 77a of No. 7 protrudes to the right with respect to the solenoid body, and a pin 77b extending in the vertical direction is fitted at the tip of the movable rod. The lower end of the bin 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, the magnetic head switching command rod 75 is moved to the left (therefore, the start trigger lever 73 is rotated clockwise in FIG. 18) by pulling the movable long door 7a of the noid 77. -ing Further, as shown in FIG.
A group of operation switches 79 is arranged on the right side of a, and one switch in the group of operation switches operates the electromagnetic solenoid 77 [! It serves as a changeover command switch for shutting down. As shown in FIGS. 2, 4, 10, and 17, the front surface of the rear bent portion 3a of the chassis 3 to which the control plate 39 is attached is located in the same direction as the control plate. A moving member 81 is attached to be movable in the left-right direction.

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

As is particularly clear from FIG. 3, a T-shaped lever E83 is disposed on the right side of the moving member 81.
Further, it is rotatably attached to the rear end bent portion 3a of the chassis 3 at approximately the center thereof. A first end 83a formed on the lever [83 and extending downward is connected to the rear end of the moving member 81 via a coil spring 84. In other words, when the moving member 81 moves to the left, the lever 83 rotates clockwise in FIG. 17. A bottle 83c extending forward is protruded from the tip of the end portion 83b, and the bottle can be engaged with a convex portion 39Q and a concave portion 39h formed at the rear end of the control plate 39, respectively.

When the bottle 83c is engaged with the recess 39h, the control plate 39 is at its most backward movement position (rightward movement limit position).
The bottle 83C can be moved up to the convex portion 39 (+
When engaged, 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 restriction portion 39 formed on the control plate
d 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, an electromagnetic solenoid 86 is arranged above the electromagnetic solenoid 77 in parallel with the electromagnetic solenoid.
It is fixed on the chassis 3. This electromagnetic solenoid 8
The movable rod 86a of No. 6 protrudes leftward with respect to the solenoid main body, and a pin 86b extending in the front-rear direction is fitted at the tip of the movable rod. This bottle 86b is
A third end 8 formed on the lever E83 and extending upwardly
It is pivotally attached to the tip of 3d. In addition, the movable rod 86
When lever F83 is in its protruding position (the position shown in FIG. 17), pin 83c of lever F83 engages with protrusion 39o at the rear end of control plate 39. The electromagnetic solenoid 86 is activated by operating the key of the automobile in which the cassette deck is mounted, and when the key is in the on state, the movable rod 86 of the electromagnetic solenoid 86 is activated.
a is pulled in as the movable member 81 moves to the left and is fixed at the retracted position, so that the pin 83c of the lever E83 engages with the rear end recess 39h of the control plate 39. . Further, when the key is turned off, a coil spring 8 biases the moving member 81 to the right.
2), the movable rod 86a is pulled out.
Therefore, the pin 83c of the lever E8°3 engages with the rear end convex portion 39( ) of the control plate 39.

The above-mentioned moving member 81, coil spring 82, lever E83, coil spring 84, electromagnetic solenoid 86, and surrounding small members related to these move the control plate 39 to the maximum return position when the power is turned off. A prohibition/cancellation means is configured 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 also serves as the pivot shaft of 7. On the other hand, as is particularly clear from FIGS. 3 and 5, there is a pair of support shafts 8 extending upward on the chassis 3 and near the capstan 30a.
9 is provided protrudingly, and a pinch roller 90 is rotatably attached to the free end of the 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 66 for adjusting the azimuth of the magnetic head 49 is attached to the lower end of the left edge of the bottle. One end (see, for example, FIG. 5) is engaged. Arm member 91
The pinch roller 90 is urged by the spring 66 in a direction toward the capstan 30a.

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

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

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

When the pin 91a engages with the notch 56c, the arm member 91 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 selectively detached from the capstan 30a by the reciprocating movement of the slide member 56, which is a component of the head rotation mechanism described above.

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

These protrusions 47a and recesses 47b are adapted to engage with a pin 30d protruding from one swinging end of the support lever 30 shown in FIG. 3, for example, when the head stand 47 moves to the right. . The protrusion 47a formed in a mountain shape is the bottle 3.
0d, the support lever 30 is attached to the support lever and swings in the direction in which the idler gear 28 is detached from the double gear 5f of the reel unit 5, and the concave portion 47b follows the protrusion 47a and 30d, the support lever 30 returns to the position where the idler gear 28 meshes with the double gear 5[.

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 four portions 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 B95 and the support protrusion 3d provided at the left rear end of the chassis 3. It can be installed freely.

A cassette holder 98 for holding a cassette half is attached to the free end, that is, the front end, of the swinging member A96 so as to be swingable at the center in the front-rear direction. In addition,
For example, the position of the cassette holder 98 shown in FIG. 5 is referred to as the raised position of the cassette holder. The cassette half is inserted into the Karen 1 to holder 98 in this position from the direction of the arrow S and held by the force hammer boulder. 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 cassette holder 98 is movable between this lowered position and the above-mentioned upper 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 r395 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
0 is formed with four parts 100b that recess downward, and when the cassette half is inserted, the right side member 10
0 moves rearward, the pivot shaft 98a of the cassette holder 98 falls into the recess 100b, and the cassette holder moves to the lowered position. A coil spring 104 is connected to the right end of the swinging member A96 for biasing the swinging member clockwise in FIG. 13. Note that as the moving member 101 moves in the cassette half insertion direction (rearward), the cassette holder 98 is urged by the coil spring 103 toward the upper 2 lowered position.

As is clear from FIGS. 12 and 14, the moving member 10
The upper surface member 99 of 1 has a protrusion 990 facing the reel hole 106 of the cassette half to be inserted, and this protrusion 99c.
A spring member 99d is provided to bias the cassette half so that it protrudes into the reel hole 106. Note that the protrusion 99c is formed integrally with the upper surface member 99 by stamping or the like. In this way, the protrusion 99C
By integrally forming the protrusion 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 mounting ε are reduced, leading to cost reduction. It is being

The top member 99 is also formed with another protrusion 998 that engages the cassette half in the vicinity of the reel hole 106. Like the above-mentioned projection 99c, this projection 990 is also formed integrally with the upper surface member 99 by stamping or the like, and thereby, cost reduction is achieved 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, perform the F operation (tape fast forward operation) and the 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 are provided on the sub-chassis C111 so as to be reciprocally movable in the longitudinal direction. The front end portions of the eight longitudinal operating levers That is, the operating end portions are separated by a predetermined distance from one another on the left and right, and each operating end portion has an operating button 115.11 provided on the front surface of the housing 2.
6 (shown in the first diagram) is attached. The longitudinal operation lever 113 disposed at the bottom is used to perform the FF operation by its forward movement, that is, backward movement, and the longitudinal operation lever 114 provided at the upper side is used to perform the REW operation by its forward movement. It is for performing actions. Each of these longitudinal operation levers 1
13 and 114 are arranged above the magnetic head 49. Further, the both arm control levers 113 and 114 are each given a forward bias by coil springs 118 and 119. As is particularly clear from FIGS. 7 and 15, the upper end of the longitudinal bin 121 protruding from the left end of the upper surface of the head stand 47 is located on the left side of the rear end of the longitudinal operation levers 113 and 114. Tapered portions 113a and 114a are formed that can be engaged when moving to the right. That is, by pressing any of these longitudinal operation levers 113 and 114 while the head stand 47 is moving to the right, the head stand 47 is moved to the left by a predetermined amount, and thereby the magnetic head 49 is separated from the magnetic tape. In addition, 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 support lever 3 that holds the idler gear 28.
As a result, the idler gear 28 is disengaged from the double gear 5f of the reel unit 5. 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.

Returning to the original topic, as shown in FIG. 2, FIG. 3, and FIG. A coil spring 125 is connected to the upper end protrusion 124a of the plate 124 to provide a forward tension to the plate.A T-shaped coil spring 125 is connected to the upper end projection 124a of the plate 124. A lever L-1126 is rotatably attached at its central portion.As is particularly clear from FIG. 16, a first end 126a formed on the lever H126 and extending downward
A contact edge of a protrusion 113C extending downwardly from the longitudinal operation lever 113 is brought into contact with the front edge of the lever. Further, the front edge of the second end 126b formed on the lever H126 and extending upward is provided with the rear edge of a protrusion 114C extending substantially leftward and protruding from the longitudinal operation lever 11/I. It is connected. That is, the longitudinal operation lever 1
By pressing 13 and 114, respectively, the lever H12
6 rotates counterclockwise and clockwise in FIG.

A lever 1129 formed in a substantially dogleg shape is arranged in front of the plate 124, and is rotatably attached to the left bent portion 3f of the chassis 3 at its central bent portion. A bottle 129b is provided protruding from the tip of a first part 129a formed on the lever 1129 and extending rearward, and this bottle 129b is formed on a third end 126c formed on the lever H126 and extending forward. It is slidably fitted into the elongated hole 126d. Further, the second end 129c of the lever T129 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.
IF is attached to the tip of 29c. Also, a gear transmission FM structure 1 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.
35 are set up. The gear 132, which is the first gear of the gear transmission mechanism, is connected to each gear portion 2 of the pair of flywheels 27.
7a, and the final stage gear 134 is designed to be able to mesh with a small diameter gear portion formed in the double gear 5f of the reel unit 5. Namely. When the longitudinal operation levers 113 and 114 are pressed, the lever 1-1126 swings the 1-flange 130.
swings rearward and forward, whereby the reel units 5 disposed at the rear and front are selectively rotated at high speed.

As shown in FIG. 2, FIG. 7, FIG. 15, and FIG. An intermediate lever 138 is provided which is capable of reciprocating in the direction of movement (back and forth direction) of the both arm operating levers.The intermediate lever 138 is equipped with a coil spring 139 that applies a forward bias to the intermediate lever. As is particularly clear from FIG. 15, a bin 138a is protruded from the lower surface of the rear end of the intermediate lever 138, and the bin 138a is connected to the longitudinal operating lever 1 in a corresponding manner.
13. Long hole 14 formed to extend in the front-rear direction at 114
0 in a slidable manner. A four part 140a into which a bottle 138a can be inserted is formed on the right end side of the central part of the elongated hole 140. Here, the intermediate lever 138 can swing by a predetermined angle about a support shaft 138b at its front end. Further, a coil spring 139 that urges the intermediate lever 138 forward is tensioned so as to be inclined to the right from the rear to the front. 1
It is also biased counterclockwise in FIG. That is, when both the branch hand control levers 113 and 114 are moved forward (move backward) at the same time, the pin 138a of the intermediate lever 138 fits into the recess 140a of the elongated hole 140.
6-1, the intermediate lever 138 is configured to move rearward. However, a pair of eldest child operation levers 11
3. If only one of the levers 114 is moved forward, the rear right edge 1401) of the long hole 140 formed in the other longitudinal operating lever is still in contact with the bin 138a, so the intermediate lever 138 forward movement (backward movement) is not performed.

Although not detailed, the longitudinal operation lever 1 for FF operation
A mechanism is provided for locking either one of the longitudinal operating levers 13 and 114 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. In addition, each longitudinal operation lever 113. , 114 is pressed, a lever J142 provided at the rear of the two-hand control lever is swung clockwise in FIG. 15 to operate the mute switch 143. .

For example, as is clear from FIGS. 2 and 7, a bottle 138d is protruded from the upper surface of the rear end of the intermediate lever 138, and the bottle 138d is attached to the left end of the swinging member 96 (for example, shown in FIG. 6). 96a and 1q.

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 mounted on 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 both mechanically actuated upon insertion of the cassette half into the cassette holder 98.

As shown in FIGS. 2, 7, and 18, a switch 1/I9 for switching between FF and REW is fixed on the front surface of the left end of the sub-chassis A11. This switch 149 operates when the moving plate 52 attached to the subchassis A is engaged.

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

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

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

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

Along with this cassette half insertion operation, the switches 147 and 148 shown in FIG.
starts rotating. When the motor 24 rotates, as shown in FIG. 10, the small pulley 24a is rotated in the direction of arrow M, the pulley 23 is rotated in the direction of arrow N, and the pair of front and rear flywheels are rotated in the directions of arrows O and P, respectively. . Therefore, the pair of reel units 5 start rotating in the directions of arrows Q and R (as shown in the 10th figure) via the pair of idler gears 28, respectively. In this way, since the pair of reel units 5 rotate in opposite directions, slack in the magnetic tape within the cassette half 155 is wound up.

When the slack in the magnetic tape is wound up and a predetermined tension is applied to the magnetic tape, all of the 4N components of the reel unit 5 shown in FIG. It is fixed by the reaction force of the tension, and only the double gear 5f continues to idle with respect to the group of fixed members via the felt plate 51). 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 to
0 in the counterclockwise direction in FIG. Therefore, the bin 10b protruding from the end detection lever 10 is moved to the top of the mountain-like protrusion 1/I'tl 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 bin 10b of the end detection lever 10
stops at the top position of the mountain-like protrusion 14b, whereby the protrusion 14C of the end detection gear 14 engages with the bottle 10b. Therefore, the end detection lever 10 moves upward, and the start trigger lever 73 rotates clockwise in FIG. 18 via the lever AI2. In this way, 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, is now able to rotate, and due to the biasing force of the coil spring 35, the first gear 33 is rotated as shown in FIG. It can be rotated clockwise. Therefore,
The partial tooth portion 33b of the first gear 33 meshes with the gear 16, and the first gear begins to rotate. The control plate 39 shown in FIG. 17 etc. is moved to the left by the rotation of the first gear 33,
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 control board 39 has reached its maximum forward movement position (leftward movement limit position)
The prohibition lever 69 is attached to the bottle 39e 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 gear 33 rotates, the moving member 81 shown in FIG. 17 is also moved to the left as shown in FIG. 23. Therefore, the lever E83 rotates clockwise as shown in FIG.
The movable rod 86a of the electromagnetic solenoid 86, which is already in the on state, is pushed in. By this operation, the pin 830 of the lever E83 comes to engage with the four portions 39h formed at the right end of the control plate 39, and therefore the control plate 39 moves to the most backward movement position (rightward movement limit position). becomes possible. Further, when the three bins 390 of the control plate enter into the engagement recess 69a of the prohibition lever 69, the prohibition lever 69 rotates a predetermined amount clockwise as shown in FIG. (For example, the seventh
The mute switch 143, which had been turned on via the switch (see figure), 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. 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 other, that is, the front pinch roller 90, contacts the capstan 30a. Remains detached from stun. 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, the start trigger lever 7 is activated via the magnetic head switching command rod 75.
3 rotates in the closing direction when shown in FIG. As a result, the first gear 33, whose rotation was restricted by the start trigger lever, becomes rotatable, and is rotated clockwise in FIG. 18 by the biasing force of the coil spring 35. Therefore, the partial tooth portion 33b of the first gear 33
is engaged with the gear 16, and the first gear begins to rotate. 1st
Immediately after the gear 33 starts rotating, the protrusion 33f protruding from the first gear engages with the engagement protrusion 69b of the prohibition lever 69 (see FIG. 17), causing the prohibition lever to move to the counterclockwise position h1 in FIG. Rotate in the direction. Then, the engagement state between the engagement recess 69a of the prohibition lever and the pin 39e of the control plate 39 is released, and the control plate 39 is instantly moved to the most backward movement position (rightward movement limit position) by the biasing force of the coil spring 40. was forced to return to When the control plate 39 returns to the most backward movement position, the head stand 47 moves to the left, and the magnetic head 49
INF is separated 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.
21st! Rotation of the Li car 34 is restricted. Control board 3
9 returns to the most backward movement position described above, this restriction is released, and the second gear 34 is rotated clockwise in FIG. 18 by the action of the pawl member 51a and spring member 51b shown in FIG. 7, for example. I am forced to do it. Therefore, the toothed portion of the second gear 34 meshes with the gear 18, and the second gear begins to rotate. As the second gear 34 rotates, the stop 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. The magnetic head 49 is REV
Rotated 180° to the side. Also, move 71 note 52
By moving the switch 149 to the left, the switch 149 changes from the FWD side to the RE.
It can be switched to the V side.

Due to the rotation of the second gear 34, the stop pin 34a of the second gear is rotated by the protrusion 39G formed on the control plate 39 (
(see FIG. 17, etc.), and the control plate is moved a predetermined distance to the left by the stop bin. When the second gear 34 completes 180° rotation, the stop bin 34
a 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 three control plates, and the control plate 39 moves to the forward position (leftward direction). It is moved to the movement limit position) and 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, as the head stand 47 moves rightward, the rear idler gear 28 is disengaged from the reel unit 5, and the front idler gear 2
8 is engaged with the reel unit 5, and only the front reel unit 5 starts rotating. Further, the front pinch roller 90 is brought into contact with the capstan 30a, and the rear pinch roller 90 is held separated from the capstan 30a.

In this way, the tape transport direction is switched from the FWD side to the REV side.In addition, regarding the operation of switching the tape transport direction from the REV side to the FWI) side, the stop bin 34 of the second gear 34
This operation is substantially the same as the tape transport direction switching operation from the FWD side to the REV side, except that b engages with the claw portion 521) (shown in Figure 18) of the moving plate 52 to move the moving plate to the right. Yes, not detailed.

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

For example, when tape transport to the FWD side is completed, a predetermined tension is applied to the magnetic tape at the end, and all the components of the reel unit 5 shown in FIG. 11, excluding the double gear 5f, are The shape is fixed by the reaction force of the tension. Therefore, only the double gear 5f continues to idle with respect to these fixed members via the felt plate 5h. When the tape is being transported to the FWD side, the fixed members are also rotating except for the arm member 51. Further, the arm member 51 receives a biasing force caused by the rotational force, and moves the intermediate lever 7 via the floating lever 8 to the second position.
The force is applied in the counterclockwise direction in Figure 2. As a result, the end detection lever 10 to which the rear end of the intermediate lever is pivoted is urged to rotate in the counterclockwise direction in FIG.
The bottle 10b protruding from the end detection lever slides in contact with the mountain-like protrusion 14b of the end detection gear 14, and the bottle 10b does not engage with the protrusion 14c of the end detection gear. However, when the members of the reel unit 5 except for the double gear 5f become fixed when the tape stops, the force that urges the end detection lever 10 also disappears, and the protrusion 14c of the end detection gear 14 moves toward the bin 10b of the end detection lever. engage with. Therefore, the end detection lever 10
moves upward, and the start trigger lever 73 is rotated clockwise in FIG. 18 via the lever A12. The following is the FWC1 side by pressing the switch mentioned above →
The tape transport direction is switched by exactly the same operation as that for switching the tape transport direction to the REV side. Note that automatic switching of the tape transport direction from the REV side to the FWD side is performed in the same manner as described above, and will not be described in detail.

Next, FF operation (tape fast forward operation) and R [W 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. Further, 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, and the head stand 47 is thereby moved to the left by a predetermined amount. , the contact between the magnetic head 49 and the magnetic tape is loosened.

As is clear from FIG. 25, the backward movement of the longitudinal operating lever 113 causes the lever 1126, which engages with the protrusion 113C of the longitudinal operating lever, to swing counterclockwise in FIG. 25. Therefore, the lever 129 similarly swings clockwise in FIG.
It rotates counterclockwise in FIG. 26 about 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 removed from the reel unit 5 by 1liIt.

Therefore, the rear reel unit 5 rotates at high speed, and the tape is rapidly forwarded.

When performing a REW operation, this is done by pushing the REW operation longitudinal control lever 114. That is,
The protrusion 114C of the longitudinal operation lever 114 is the lever H126.
The lever H is rotated clockwise in FIG. 25, and the first gear 132 and the final 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 FF operation longitudinal operation lever 113 and the REW operation operation longitudinal operation lever 114 can be pushed simultaneously. Part 2
By simultaneously pressing the longitudinal operating levers of the book, the intermediate lever 138 (for example, shown in FIG. ). Thus, the exact opposite action when loading the cassette half 155 causes the cassette half to be projected into a position for retrieval by the listener. In addition, for example, since the switch 150 shown in FIG. 24 also operates, the electromagnetic solenoid 86 (the 23rd
(see figure) is turned off, and the lever E83 is returned to the state shown in FIG. 17 by the action of the coil spring 82. Therefore, the bin 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 three control plates are prohibited from returning to their maximum return 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 Trigger means is provided for meshing with the gear transmission mechanism. Therefore, the magnetic head rotates only after the head stand moves and the magnetic head has completely MIIRed 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 caused to move forward by the rotation of the first gear, and is moved back and forth between the forwardmost position and the most backward position. The control plate (39) includes a control plate (39) formed with a regulating portion that engages with the second gear to regulate rotation of the second gear when the second gear is not in the position; prohibition/cancellation means (electromagnetic solenoid 8
6 etc.) are provided. By providing this prohibition/cancellation means, even if the power is turned off during playback of a magnetic tape, the rotation of the second gear, that is, the rotation of the magnetic head, will not occur, and the power will be turned on again. sometimes,
Tape playback begins in the state before the power was turned off. This is particularly effective when the cassette deck is used in a car.If the power is turned on and off using the car key, the driver can turn off the key and turn off the car while the tape is being played. When you leave, return, and turn the key on again, the playback will start from the part you were listening to when you turned the key off.

[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. It is a figure for explaining. Explanation of symbols of main parts 1...Cassette deck 2...Housing 2a...Opening 3...
- Chassis 66-3a, 3f...Bending portions 3c, 5m, 56a, 95a, 126d. 140...Elongated hole 3d...Support protrusion 5...Reel unit 5a...Rotation shaft 5b...
Reel 5C...Color 5d...
Bush 5e... Expanded diameter part 5f...
Double gear 5G, 5 Q, 30b, 35, 40.41° 60.70.76.82, 84, 103° 101.11
8,119,125,139...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. 138a, 13BcJ-----bin 7b, 64a
. . . Opening 70.56G . . . Notch 8 . . . Idle lever 10 . 39c, 42a, 4ja, 49a, 56e. 81a, 99c, 99e, 113c. 114C...Protrusion 11...Sub-chassis A 12...Lever A 14...End detection gears 14a, 39h, 47b, 100b. 140a...Protrusion 14b...Protrusion 16.17.18.19.61.132°133.13
4...Gear 20.135...Gear transmission mechanism 22...
・Worm 23...Pulley 24...
・Motor 24a...Small pulley 25...
... Belt 27 ... Flywheel 2
7a, 27b...Gear portion 28...Idler gear 30...Support lever 30a...Capstan 33...
...First gear 33t) ...Partial tooth portions 33c, 33d, 34c, 34d ... Missing tooth portion 3
4... Second gears 34a, 34b... Stop bin 36.124
...Plate 39...Control board 39d...
Regulation part 39C1... Convex part 42...
...Lever B44...Lever C47...
...Head stand 49...Magnetic head 51a, 123...Claw member 51t), 99d...Spring member 52...
- Moving plates 52a, 52b...Claw portion 53...Lever D 54.66...Spring 56...Slide member 56d, 113a, 114a... ...Tapered part 5
7... Bearing member 59... Fan-shaped gear 64... Regulation member 65... Screw 69... Prohibition lever 69a...・
Engagement recess 69b...Engagement protrusion 73...Start trigger lever 73a...
...One end 73b, 83b, 126b, 129c ...Second end 75...Magnetic head switching command Rondoor 7.86
......Electromagnetic solenoids 77a, 86a...
・Movable Ron door 9... 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... Rocking member 96a...・・・・・・
Left end portion 98...Cassette holder 98a...
... Swing shaft 99 ... Top member 10
0... Right side member 101... Moving member
102... Lever F106...
Reel hole 107... recess 111...
... Zabu chassis C 113, 114 ... Longitudinal operation lever 115.1
16...Operation button 121...Longitudinal bottle 124a...-H end protrusion 126...
...Lever H129...Lever 1130...
...Swinging lever 138 ...Intermediate lever 1
40b... 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 second gear is provided so as to be reciprocally movable between the first gear position and the most backward position, is caused to move forward by the rotation of the first gear, and engages with the second gear when the first gear is not in the most backward position. a control plate formed with a regulating portion for regulating the rotation of the control plate; and 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 when the control plate reaches the forwardmost position, and to release the prohibition by the initial movement of the first gear; and the first and second gears. and a biasing means for biasing the control plate in the direction of meshing with the gear transmission mechanism, which prohibits the control plate from returning to the most backward position when the power is turned off, and when the power is turned on. A cassette deck characterized by being provided with a prohibition/cancellation means for canceling a prohibition.