JPS6182311A - Cassette deck - Google Patents

Abstract

PURPOSE:To attain sure mutual timings between the motion of a head base and the rotation of a magnetic head by rotating the first gear at 360 deg. to move the head base back and forth core and rotating the second gear at 180 deg. to rotate the magnetic head at 180 deg.. CONSTITUTION:A head driving mechanism which drives a head base 47 is consti tuted with a gear 33, a control plate 39, etc. A head rotating mechanism which rotates a magnetic head 49 is constituted with a gear 34, a moving plate 52, a lever 53, a slide part 56, a sectorial gear 59, a gear 61, etc. The head base 47 is moved back and forth and the head 49 is rotated by these control mechanisms. The head base 47 is moved back and forth once when the gear 33 is rotated at 360 deg., and the head 49 is rotated at 180 deg. when the gear 34 is rotated at 180 deg.. Consequently, sure and optimum mutual timings between recipro cating and rotation of the head 49 are attained.

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 decks can be accommodated.

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

Various configurations for switching between forward and reverse magnetic heads have already been proposed. For example, when playing back a 4-track magnetic tape, 4-channel magnetic heads are provided, and 2 of the 4-channel magnetic heads are
A type in which each channel is electrically switched according to the forward and reverse running of the magnetic 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. and so on.

Among these various magnetic head switching formats, the magnetic head A format in which the image is rotated is adopted.

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

The already developed cassette deck has a drive source for rotating the magnetic head, and a drive 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, one being a power source. Therefore, it has been a problem to reduce the size and cost of the entire cassette deck.

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

The cassette deck according to the present invention includes a head stand that can freely reciprocate in a direction substantially perpendicular to the tape transport direction, and a head stand that is placed on the head stand between two angular positions about an axis that is substantially parallel to the moving direction of the head stand. a magnetic head that is rotatably provided; a tape transport direction switching means that determines a tape transport direction corresponding to the angular position of the magnetic head; and a first gear that reciprocates the head stand by rotation. a head rotation mechanism including a base drive mechanism, a second gear that rotates the magnetic head by rotation, and a gear transmission mechanism that can mesh with the first and second gears, and the first and second gears; a rotational force applying mechanism that applies a rotational force from a single drive source to a trigger, the trigger causing the second gear to mesh with the gear transmission mechanism when the first gear meshes with the gear transmission mechanism. means is provided, and the trigger means is provided to be able to reciprocate between a forwardmost position and a most backward position, and is caused to move forward by the rotation of the first gear, and when the trigger means is not in the most backward position, a control plate formed with a restriction portion that engages with a second gear to restrict rotation of the second gear; a biasing unit that biases the control plate in the backward movement direction; a prohibition means configured to prohibit the backward movement of the control plate when the movement position is reached, and release the prohibition by the initial movement of the first gear; and the first and second gears are connected to the gear transmission mechanism. and a biasing means for biasing in the direction of meshing, and when the first gear rotates 360°, the head stand performs forward and backward movements, and the second gear rotates 180°.
The magnetic head is characterized in that the magnetic head rotates by 18 degrees when rotated.

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

A coil spring 5g is interposed between the double gear 5f and the bush 5d to bias the double gear and the bush away from each other. Further, a felt plate 51) is provided between the enlarged diameter portion 5e of the reel 5b and the double gear 5f. The felt plate 5h is attached to the enlarged diameter portion 5e, and is in slidable contact with the double gear 5f. An arm 51 is provided between the upper surface of the enlarged diameter portion 5e and the collar 50, and one end of the arm 51 is rotatably attached to the outer periphery of the reel 5b. The lower and upper surfaces of the arm 51 are movably engaged with the enlarged diameter portion 5e and collar 50 of the reel 5b via washers 5j and 5k,
A coil spring 5p 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 attached to the chassis 3 so as to be rotatable in a plane parallel to the main surface of the chassis. A rectangular opening 71) is formed at the front end of the intermediate lever 7, and a floating lever 8, which is movably provided on the chassis 3, is inserted into the opening.
A protruding bottle 8a is loosely fitted into the center of the bottle.

The floating lever 8 has bottles 8b protruding from both ends thereof, and each bottle is slidably engaged in a long hole 5m formed at the free end of the arm 51 of the reel unit 5. ing. As shown in FIGS. 7 and 18, an end detection lever 10 is disposed near the rear end of the intermediate lever 7. As shown in FIGS. The end detection lever 10 is connected to a sub-chassis A1 which is fixed to the upper surface of the rear end of the chassis 3 and protrudes upward.
one end of a lever AI2 rotatably provided on the lever AI2;
In this case, at the right end to the lever, it is pivotably mounted at the upper end. A projection 10a extending downward is provided at the lower end of the end detection lever 10, and the projection is slidably engaged with a notch 7C formed at the rear end of the intermediate lever 7.

As shown in FIGS. 7, 9, and 18, a bin 10b is provided protruding from the rear surface of the upper end of the end detection lever 10, and the bin is rotatably attached to the subchassis A. Further, it engages with an end detection gear 14 facing the rear end surface of the end detection lever 10. As is clear from FIG. 7 and FIG. 18, a recess 14a is formed on the surface of the end detection gear 14 facing the end detection lever 10, and a recess 14a is formed on the circumferential surface of the recess that protrudes in the radial direction of the end detection lever. Three substantially mountain-shaped protrusions 14b having the same shape are provided at a pitch of 120°. . Moreover, three protrusions 14C 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 14
If a circle is assumed to be located at the top of c, the diameters within these valleys are approximately the same size. The bottle 10b protruding from the end detection lever 10 is connected to these protrusions 14b.
and can be engaged with the protrusion 14c.

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

As shown in FIG. 2, FIG. 7, FIG. 9, and FIG.
On the left side are four gears 16, 17.1 meshing in series.
A gear transmission mechanism 20 consisting of gears 8 and 19 is provided, and the end detection gear 14 is the final stage gear 1 of the gear transmission mechanism.
It meshes with 9. As shown in FIG. 18, the first stage gear 16 of the gear transmission mechanism 20 (note that the reference numeral 20 is not shown in FIG. 18) meshes with a worm 22 rotatably attached to the subchassis A11. are doing. A pulley 23 is integrally formed at the lower end of the worm 22. As shown in FIG. 10, the pulley 23 is rotationally driven via a belt 25 by a motor 24 located at the right rear end of the chassis 3. As shown in FIG. Note that the belt 25 is directly wound around a small pulley 24a fitted to the output shaft of the motor 24.

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

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

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

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

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

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

As shown in FIGS. 2, 3, 9, and 11, a bent portion 3a extends upward parallel to the sub-chassis A11 at the rear end of the chassis 3, that is, at the rear of the sub-chassis A11.
is formed. As shown in FIG. 4, a control plate 39 made of a rope plate is attached to the front surface of the bent portion 3a so as to be movable in the left-right direction. The movement limit position of the three control plates in the left direction is referred to as the most forward movement position of the control plates, whereas the movement limit position in the right direction is called the most return movement position. A coil spring 40 is provided at the right end of the control plate 39 to urge the control plate to the right, that is, in the backward movement direction.
are connected. A protrusion 39 that is approximately in the center of the control plate 39 and is inclined upwardly is engaged with the pin 33a of the first gear 33.
a is formed. The right edge of the protrusion 39a engages with the pin 33a, so that the control plate 39 is moved forward by the rotation of the first gear 33. As shown in FIGS. 2, 4, and 10, the control plate 39 is connected to the lower part of the control plate via a coil spring 41, and moves to the left as the illumination plate moves forward. A moving lever B42 is arranged. 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 3 to be moved by the biasing force of the coil spring 40.
With the return movement of 9, the lever B42 also returns to the right. As is clear from FIG. 2, FIG. 8, and FIG. The lever C4/I is rotatably attached to the chassis 3 at the rear ☆M:.The front end of this lever C44 is attached to the chassis 3 so as to be able to reciprocate in the left and right direction. The drive direction of the magnetic tape is the front-rear direction.
Therefore, the moving direction of the head stand 47 is approximately perpendicular to the tape transport direction.

The head stand 4 is constructed by the above-mentioned first vehicle 33, three control plates, coil spring/10.41, lever B42, lever C44, and small peripheral parts related to these.
A head stand drive mechanism for driving the head 7 is configured.

Next, the second gear 34 and its I\1 consecutive part will be explained. The second gear 34 is for rotating the magnetic head 49 provided on the head stand 47, and is for rotating the magnetic head 49 provided on the head stand 47.
It is arranged at a position farther from the head stand 47 than the gear 33. Further, the rotation ratio of the first gear 33 and the second tooth space 34 is 1:1.

As is clear from FIGS. 7 and 18, the second gear 34
Two stop bins 34a and 3i are protruded from the rear surface with a pitch of 1806, and one stop bin 34a passes through the second gear so as to also protrude from the front face of the second gear. ing. In addition, both stop bins 34a,
34. b is a protrusion 3 protruding from the upper end of the rear end of the control plate 39;
9c can be engaged with the right edge. That is, the control plate 39 can also be moved forward by the two stop pins.

Further, a pawl member 51a and a spring member 511) are provided near the second gear 34, and the second gear 34 is biased clockwise 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 sub-chassis A so as to be able to reciprocate in the left-right direction. At the right end of the moving plate 52, there is a slot protruding from the front of the second gear 34.
~ Claws 52a and 52 that can engage with the tube bin 34a! ]
is formed. The claw portion 52a engages with the stop bin 34a at its right edge, and engages with the stop bin 3zla at its left edge. 52 is the second tooth plate 34
It reciprocates by rotating 180° in one direction.

As shown in FIG. 2, FIG. 3, and FIG. 9, a lever D53 formed in a substantially dogleg shape is disposed near the left end of each of the movable plays 1 to 52, and the lever D53 has a central bent portion. It is rotatably attached to the upper surface of the chassis 3 at. Also,
The lever D53 is click-biased by a spring 54 (see FIG. 3). The left end of the moving plate 52 is resting on the @ end of this lever 053. In addition, the front *I portion of the lever D53 is connected 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.

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 disposed at a position sandwiching the slide member 56 together with the bearing member 57, and is rotatably attached to the front end of the bearing member 57 in the main valve of the fan. However, in order to prevent the joint between the fan-shaped gear 59 and the bearing member 57 from interfering with the reciprocating movement of the slide member 56, the slide member 56 has an elongated hole 56a into which the joint is loosely fitted.
is provided extending in the front-back direction. Note that the fan-shaped gear 59 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 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 3
4 rotates 180°, the magnetic head 49 rotates 1
It is designed to rotate 80 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, the head stand 4
A regulating member 64 extending in the front-rear direction is fixed on the magnetic head 7 so as to surround the magnetic head 49 .

The regulating member 64 is made of a steel plate and has flexibility. The regulating member 64 is formed symmetrically in the front-rear direction, and is fixed to the head stand 47 at its center portion, and both front and rear ends extending in a direction away from each other around the center portion serve as the magnetic head 4. It is possible to engage with the outer circumferential portion of the two. More specifically, both front and rear ends of the regulating member 64 are positioned so as to sandwich the magnetic head 49 from the front and back, and both ends are bent into a U-shape, with the lower side of the U-shape being magnetically A protrusion 49a protruding from the outer periphery of the head 49
By engaging with the magnetic head 49, rotation of the magnetic head 49 is restricted.

Note that 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 a stationary state before operation, the toothless portion 33c corresponds to the gear 16 (a part of the gear transmission mechanism 20), and the partial 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 is also formed with two toothless parts 34c and 34d with a pitch of 1806, 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 enter the gear 18, as will be described later.

Next, regarding the 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. explain.

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

On the other hand, as is particularly clear from FIG.
A protrusion 33f that can be engaged with is formed. That is, the first
When the gear 33 initially moves, the protrusion 33f of the first gear engages with the engagement protrusion 69I, 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.), three control plates, a coil spring 40 as a biasing means for biasing the control plates 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 partial gear 33b meshes with the gear 16 (a part of the gear transmission mechanism 20), and the toothed portion of the second gear 34 is a gear. 18 (a part of the gear transmission mechanism 20) as a biasing means for biasing the second gear in the direction of meshing with the gear transmission mechanism 20. Trigger means is configured to engage the second gear 34 with the gear 18 after the M1 gear 33 has engaged with the -F gear 16 when the first gear 33 and the second vJ wheel 34 start rotating.

As shown in FIG. 2, FIG. 7, FIG. 9, and FIG. 18, a trident-shaped start trigger lever 73 is rotatable at the center of the front face of the sub-chassis △11. It can be installed freely.

As is clear from FIGS. 7 and 18, one end 73a of the start trigger lever 73 is bent rearward at a right angle, and the bent portion can be engaged with the first gear 33. . More specifically, the pin 33a protruding from the rear surface of the first gear 33 passes through the first gear and protrudes from the front surface of the first gear by a predetermined amount, and the pin 33a protrudes from the front surface of the first gear 33 by a predetermined amount. 26 engages with this protruding portion on the front surface, thereby restricting the rotation of the first wheel 33. A second end 73b formed on the start trigger lever 73 and extending rightward engages 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 1 collar 73 engages with the end detection lever 10 via the lever A''12, and when the end detection lever 10 moves upward, the start trigger lever 73 is rotated clockwise in FIG. 18, and the rotation restriction state of the first gear 33 is released.The start trigger lever 73 has a third end 73c extending downward. have,
The third end engages with the left end of a magnetic head switching command rod 75 shown in FIG. The magnetic head switching command rod 75 is attached to the lower surface of the chassis 3 so as to be able to reciprocate in the left-right direction, and is made of a steel plate and has an L-shape as a whole. That is, the start trigger lever 73 is configured to rotate clockwise in FIG. 18 by moving the magnetic head switching command rod 75 to the left. Also,
Similarly, as shown in FIG. 10, a coil spring 6 is disposed near the head switching command rod 75 to apply a rightward bias to the third end 73c of the start trigger lever 73. Figures 2, 3 and 17
As shown in the figure, an electromagnetic solenoid 77 is arranged near the motor 24 so as to extend from side to side, and is fixed on the chassis 3. A movable rod 77a of the electromagnetic solenoid 77 protrudes to the right with respect to the solenoid body, and a pin 77b extending in the vertical direction is fitted at the tip of the movable rod. The lower end of this bin 77b is
A magnetic head switching command rod 75 is loosely fitted into a long hole 3C extending in the left-right direction on the main surface of the chassis 3.
is engaged with the right end of the That is, by pulling the movable rod 77a of the electromagnetic solenoid 77, the magnetic head switching command rod 75 is moved to the left (therefore, the start trigger lever 73 is rotated clockwise in FIG. 18). It is. Further, as shown in FIG. 1, an operation switch group 79 is arranged on the front surface of the housing 2 and to the right of the opening 2a, and one switch of the operation switch group is connected to the electromagnetic solenoid. 77
This is a command switch for activating the

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

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

As is particularly clear from FIG. 3, a T-shaped lever E83 is disposed on the right side of the moving member 81.
It is rotatably attached to the rear end bent portion 3a of the chassis 3 at approximately the center of the moon. A first end 83a formed on the lever E83 and extending downward is connected to the rear end of the moving member 81 via a coil spring 84. That is, as the moving member 81 moves to the left, the lever E83 rotates clockwise in FIG. 17. A bottle 83c extending forward is protruded from the tip of the second end 83b formed on the lever E83 and extending leftward, and the bottle is connected to a convex portion 399 formed at the rear end of the control plate 39. and the recessed portion 39h, respectively.

When the bin 83C is engaged with the recess 3911, the three control plates are at their most backward movement position (rightward movement limit position).
Furthermore, when the pin 83C is engaged with the convex portion 390, the return of the three control plates to the most backward movement position is restricted. As mentioned above, when the three control plates are not at the most backward movement position, the regulating portion 39d formed on the control plates
engages with the stop pins 34a and 34b of the second gear 34, thereby preventing rotation of the second gear.

As shown in FIGS. 2, 3, 9, and 17, an electromagnetic solenoid 86 is disposed above the electromagnetic solenoid 77 and parallel to the electromagnetic solenoid, and
It is fixed on the chassis 3. This electromagnetic solenoid 8
The movable rod 86a of No. 6 protrudes leftward with respect to the solenoid main body, and a pin 86b extending in the front-rear direction is fitted at the tip of the movable rod. This bottle 86b is
A third end 8 formed on the lever 83 and extending upwardly.
It is pivotally attached to the tip of 3d. In addition, the movable rod 86
The pin 83c of the lever E83 engages with the rear end protrusion 39 (l) of the control plate 39 when the lever E83 is in its protruding position (the position shown in FIG. 17).The electromagnetic solenoid 86 It is activated by operating the key of the automobile in which the cassette deck is installed, and when the key is in the on state, the movable rod 8 of the electromagnetic solenoid 86 is activated.
6a is pulled in as the movable member 81 moves to the left and is fixed in the retracted position, so that the pin 83G of the lever E83 engages with the rear end recess 39h of the control plate 39. . Furthermore, when the key is turned off, the movable rod 85a is pulled out by the biasing force of the coil spring 82 which forces the moving part 4J' 81 to the right (=l), so that the pin 83C of the lever E83 is moved toward the control board. 3
9 rear end convex portion 39! ].

The above-mentioned moving member 81, coil spring 82, lever [83, coil spring 84, electromagnetic solenoid 86, and surrounding small members related thereto are used to move the control plate 39 back when the power is turned off. A prohibition/cancellation means is configured that prohibits return to the position (rightward movement limit position) and cancels the prohibition when the power is turned on.

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

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

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

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

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

A tapered portion 56d is formed at the front edge of the open end of each notch 56c, and the bottle 9ia 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 can be removed from the capstan 30a. That is, a pair of pinch rollers 90
The capstan 30a is alternatively moved by the reciprocating movement of the slide member 56, which is a component of the head rotation mechanism described above.
They are forced to leave.

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

These protrusions 47a and recesses 47h are adapted to engage, for example, with a pin 30d protruding from one swinging end of the support lever 30 shown in FIG. 3 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 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
When the concave portion 47b engages with the bin 30d following the protrusion 47a, the support lever 30 returns to the position where the idler gear 28 meshes with the double gear 5f.

On the other hand, at both the front and rear ends of the slide member 56, a pair of front and rear support levers 3 are provided which are used 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 parts 471 of the head stand 47. However, each protrusion 56e is adapted to engage only one of the pair of bins 30d in accordance with the forward and backward movements of the slide portion 4J56. Specifically, 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 is provided on the chassis B95 and a supporting protrusion 3d provided at the left rear end of the chassis 3 so that the swinging member A96 can swing freely at its rear end. is attached to.

A cassette holder 98 for holding a cassette half is provided at the free end, that is, the front end, of the swinging member A96 so as to be swingable at the center in the front-rear direction. In addition,
For example, the position of the cassette holder 98 shown in FIG. 5 is referred to as the raised position of the cassette holder. The cassette half is inserted into the cassette holder 98 in this position from the direction of arrow S and held in the cassette holder. The swing member 96 swings downward by a predetermined angle from this state, and the position of the cassette holder 98 when the cassette half held by the cassette holder 98 is positioned at the playing position is changed to the lowered position of the cassette holder. It is called. The cassette holder 98 is movable between this lowered position and the above-mentioned raised position.

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

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

A coil spring 103 is connected to the lever F102, which biases the lever F in the clockwise direction shown in FIG. .Right side part 1.
The front end of fl' 100 has a concave portion 10 that is depressed downward.
0b is formed, and when the right side member 100 moves rearward when the cassette half is inserted, the swing support shaft 98a of the cassette holder 98 falls into these four parts 100b, and the cassette holder moves to the lowered position. do.

Note that the right end of the swinging member A96 has a thirteenth swinging member.
A coil spring 104 is connected for biasing in the clockwise direction in the figure. Note that by moving the moving member 101 in the cassette half insertion direction (backward),
The cassette holder 98 is urged toward the lowered position by the coil spring 103.

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

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 formed integrally with the upper surface member 99 by stamping or the like, and thereby, for the same reason as mentioned above, reduction of scratches is achieved. Note that the protrusion 99e engages with a four part 107 called a label area formed on 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 9e 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, [F operation (tape fast forward operation), REW operation (
The mechanism for performing the tape rewinding operation will be explained.

As shown in FIGS. 2, 3, 9, and 16, the left end of the chassis 3 is bent to extend upward, and this bent portion 3f has a A subchassis C111 also shown in FIG. 15 is fixed. A pair of longitudinal operating levers 113 and 114, which extend in the front-rear direction and are vertically stacked, are attached to the sub-chassis C111 so as to be able to reciprocate in the front-rear direction. The front end portions of the respective operating levers, that is, the operating end portions, are spaced apart from each other by a predetermined distance on the left and right, and each operating end portion has an operating button 115, 116 (number 1) provided on the front surface of the housing 2. 1 shown) is attached. The longitudinal operation lever 113 disposed at the bottom is used to perform the FF operation by its forward movement, that is, backward movement, and the longitudinal operation lever 114 provided at the upper side is used to perform the REW operation by its forward movement. It is for performing actions. Each of these longitudinal operation levers 113 and 114 is arranged above the magnetic head 49. Further, the longitudinal operation levers 1/13 and 114 are each given a forward bias by coil springs 118 and 119. As is particularly clear from FIGS. 7 and 15, on the left side of the rear end of the longitudinal operation levers 113 and 114, a head stand is attached to the upper end of a longitudinal bin 121 which is protruded from the left end of the upper surface of the head stand 47. Tapered portions 113a and 1i4a 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 1 which holds the idler gear 28.
30, the idler gear 28 is engaged with the double gear 5f of the reel unit 1-5.
It is starting to break away from III. Incidentally, 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, thereby releasing the state in which the reel unit 5 is prevented from rotating in reverse by the claw member.

Returning to the original topic, as shown in FIGS. 2, 3, and 16, a plate 124 is located on the right side of the rear end of the bent portion 3f formed at the left end of the chassis 3 in the front-rear direction. It is movably attached to the A coil spring 125 is connected to the upper end protrusion 124a of the plate 124 to provide a forward bias to the plate. A T-shaped lever l-1126 is rotatably attached to the front end of the plate 12i4 at its center. As is particularly clear from FIG. 16, a first end 126 formed on the lever H126 and extending downwardly
The rear edge of a protrusion 113C, which extends downward and projects from the longitudinal operation lever 113 described above, is brought into contact with the front edge of a. Further, the rear edge of a protrusion 114C extending substantially leftward and protruding from the longitudinal operating lever 114 comes into contact with the front edge of the second end 126b formed on the lever H126 and extending upward. It is being That is, 5 hand operated lever 1
By pressing 13 and 114 respectively, the lever H12
6 rotates counterclockwise and clockwise in FIG.

In front of the play 1-124, there is arranged a lever 129 formed in a substantially dogleg shape. There is. A bottle 129b is protruded from the tip of a first pant portion 129a formed on the lever 1129 and extending rearward, and this bottle 129h is formed on a third end 126c formed on the lever H126 and extending forward. It is fitted into the long hole 126d so as to be movable. Further, the second end 129c of the lever 129 extends downward.

As shown in FIG. 2, FIG. 3, FIG. 10, and FIG. 16, each pair of reel units 5 and flywheels 2
A swing lever 130 is disposed extending in the left-right direction at a position sandwiched between the levers 7 and 7, and is swingably attached to the chassis 3 through a bin 130a at a substantially central portion thereof. The left end of the swinging lever 130 is the second @ part 1 of the lever ■129.
It is pivotally attached to the tip of 29C. Also, a gear transmission mechanism 135 consisting of three gears 132, 133 and 134 meshing in series is provided on the lower surface of the right end of the swing lever 130.
is provided. The gear 132, which is the first gear of the gear transmission mechanism, is connected to each gear portion 27a of the pair of flywheels 27.
The final stage gear 134 is designed to be able to mesh with a small diameter gear portion formed in the double gear 5f of the reel unit 5. Namely. When the longitudinal operation levers 113 and 114 are pressed, the swinging lever 130 swings backward and forward via the lever H126, thereby selectively moving the reel units 5 disposed at the rear and the front at high speeds. It can be rotated.

As shown in FIGS. 2, 7, 15, and 16, on the sub-chassis 111 holding the longitudinal operation levers 113 and 114, the cylinder An intermediate lever 138 is provided that can reciprocate in the direction of movement (back and forth direction) of the longitudinal operation lever. A coil spring 139 is connected to the intermediate lever 138 for imparting a forward bias to the intermediate lever. As is particularly clear from FIG. 15, a bin 138a is protruded from the lower surface of the rear end of the intermediate lever 138, and the bin 138a corresponds to the longitudinal operating lever 11.
3. A long hole 140 formed to extend in the front-rear direction at 114
is slidably engaged with. A recess 140a into which a bottle 138a can be inserted is formed at the right end of the central portion of the elongated hole 140. Here, the intermediate lever 138 can swing by a predetermined angle about a support shaft 138b at its front end. Further, a coil spring 139 that urges the intermediate lever 138 forward is tensioned so as to be inclined to the right from the rear to the front. 15
It is also biased counterclockwise in the figure. Zunawachi,
When the cylinder longitudinal operation levers 113 and 114 are simultaneously moved forward (move backward), the intermediate lever 138 moves the bin 1
38a fits into the recess 140a of the elongated hole 140, thereby causing the intermediate lever 138 to move rearward. However, a pair of longitudinal operation levers 113,
If only one of the levers 114 is moved forward, the rear right edge 140+ of the elongated hole 140 formed in the other longitudinal operating lever is still in contact with the bin 138a. There is no forward movement (movement backwards).

Although not detailed, the longitudinal operation lever 1 for FF operation
A mechanism is provided for locking either one of the longitudinal operating lever 13 and the longitudinal operating lever 114 for REW operation in the forward movement position when the longitudinal operating lever is moved forward. The locking mechanism 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 any of the longitudinal operation levers 113 and 114 is pressed, the lever J142 provided at the rear of the cylinder longitudinal operation lever is swung clockwise in FIG. 15, and the mute switch 143 is operated. It is done like this.

For example, as is clear from FIGS. 2 and 7, a pin 138d is provided protruding from the rear end-L surface of the intermediate lever 138, and this pin is attached to the swinging member 96 (for example, shown in FIG. 6). It can directly engage the left end portion 96a.

The intermediate lever 138 is used to move the cassette holder 98 from the lowered position to the raised position by moving the intermediate lever 138 backward to suppress the swinging portion 96.

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 8
A bracket 146 is attached to the right end surface of the switch 95, and two switches 147, 14.8 are attached to the bracket.
has been taken and has been taken down by 1. The switch 147 is used to switch the power to the cassette deck and the tuner disposed near the cullet 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 149 for switching between FF and REW is fixed on the front surface of the left end of the sub-chassis A11. This switch 149 is operated by engagement of the moving plate 52 attached to the subchassis A.

Further, as shown in FIG. 15, the sub-chassis 111
A switch 150 for cutting off 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) from the opening 2a of the housing 2 shown in FIG.
The cassette half is forcefully held in the 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 moved to the cellar 1 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) through the pair of idler gears 28, respectively. In this way, since the pair of reel units 5 rotate in opposite directions, slack in the magnetic tape in the cassettes 1 to half 155 is wound up.

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

On the other hand, the end detection gear 14 shown in FIGS. 7 and 18, for example, is activated by the rotation of the motor 24, and
0 in the counterclockwise direction in FIG. Therefore, the bottle 101) protruding from the end detection lever 10 is moved to the top of the mountain-like protrusion 141) of the end detection gear 14 as the end detection gear 14 rotates. Here, as is clear from the above, the arm 51 of each reel unit 5 is stopped. Therefore, the intermediate lever 7 is not activated, and the bin 10b of the end detection lever 10 continues to move along the 111-shaped protrusion 14b.
b stands still at the top position of the 111-shaped protrusion 14b, and j
: The protrusion 14C of the end detection gear 14 engages with the bin 10h. Therefore, the end detection lever 10 moves upward, and the start trigger lever 73 rotates clockwise in FIG. 18 via the lever A12. As a result, the first gear 33, whose rotation was restricted, becomes rotatable due to the fact that the pin 33a is engaged with the -9 of the start trigger lever 73. The biasing force prevents rotation in the clockwise direction in FIG. 18. Therefore, the partial tooth portion 33b of the first gear 33 meshes with the gear 16, and the first gear begins to rotate. First car 3
3 moves the control plate 39 shown in FIG. 17 to the left, and 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. . When the control plate 39 reaches the maximum forward movement position (leftward movement limit position), the bottle 390 protruding from the control plate
When the engagement recess 69a of the prohibition lever 69 engages with the lock lever 69, its return movement (movement to the right) is prohibited. As the first gear 33 rotates, the moving member 81 shown in FIG. 17 is also moved to the left as shown in FIG. 23.

Therefore, the lever E83 rotates clockwise as shown in FIG. 23, and the movable rod 86a of the electromagnetic solenoid 86, which is already in the on state, is pushed in. By this operation, the pin 830 of the lever E83 comes to engage with the recess 39h formed at the right end of the control plate 39, and therefore the control plate 39 moves to the most backward movement position (rightward movement limit position). becomes possible. Further, as the bottle 39e of the control plate 39 enters the engagement recess 69a of the prohibition lever 69, the prohibition lever 69 rotates a predetermined amount clockwise as shown in FIG.
2 (for example, see FIG. 7), the mute switch 143 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 5f of the front reel unit 5, and only the rear reel unit 5 is rotated. becomes. Note that this operation is performed by the protrusion 47a and recess 17b formed on the head stand 47, and the protrusion 5 provided on the slide member 56.
This depends on the interaction with 6e, but since it was explained in detail in the previous explanation of the configuration, it will not be explained in detail here. Further, as shown in FIG. 22, as the head stand 47 moves to the right, the rear pinch roller 90 comes into contact with the capstan 30a, and the other, that is, the front pinch roller 90, contacts the capstan 30a. Remains detached from stun. this is,
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 F Vl/D side is started,
Regeneration on the FWD side is performed.

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

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 clockwise in FIG. As a result, the first gear 33, whose rotation was restricted by the start trigger lever, becomes rotatable, and is rotated clockwise in FIG. 18 by the biasing force of the coil spring 35. Therefore, the partial tooth portion 331 of the first gear 33
) meshes with the gear 16, and the first gear begins to rotate. Immediately after the first gear 33 starts rotating, the protrusion 33f protruding from the first gear engages with the engagement protrusion 69b of the prohibition lever 69 (see FIG. 17), causing the prohibition lever to move in the opposite direction as shown in FIG. Rotate it clockwise. Then, the engagement state between the engagement recess 69.1 of the prohibition lever and the pin 390 of the control plate 39 is released, and the control plate 39 is instantly moved to the R return position (rightward movement limit) by the biasing force of the coil spring 40. position). By returning the control plate 39 to the most backward movement position, the head stand 47 moves to the left, and the magnetic head 4
is made to separate from the magnetic tape.

When the control plate 39 is in the forward movement position (rightward movement limit position), the pins 1 to 34a are engaged with the regulating portion 39d (for example, shown in FIG. 4) formed on the control plate, and the second gear 3/l rotation is restricted. This restriction is canceled by the return of the fli control plate 39 to the above-mentioned one-step most backward movement position, and, for example, the claw portion 4451 shown in FIG.
a and spring part A 511], the second gear 3
4 is rotated clockwise in FIG. Therefore, the second gear 3. ! ′! The toothed portion of the second gear meshes with the gear 18, and the second gear begins to rotate. As the second gear 34 rotates, the stop bin 3A is protruded from the second gear 34.
a engages with the claw portion 52a of the movable plate 52, the movable plate is moved to the left, and the magnetic head 49 connected to the movable plate is rotated 180° toward the REV side.

Also, by moving the moving plate 52 to the left, the switch 1
49 is switched from the FWD side to the REV side.

Due to the rotation of the second gear 34, the stop bin 34a of the second gear engages with the projections 39C (see FIG. 17, etc.) formed on the three control plates, and the control plate is moved a predetermined distance by the stop bins. can only be moved to the left. 2nd gear 3
4 completes 18o° rotation, the stop bin 34a
is detached from the protrusion 39c of the control plate 39, but then the pin 33a of the first gear 33 engages with the protrusion 39a of the control plate 39, and the control plate 39 is moved to the forward position (leftward movement). limit position) and is locked by the prohibition lever 69 as described above.

As the control plate 39 moves forward, the head stand 47 moves to the right again, and the magnetic head 49 comes into contact with the magnetic tape. Also,
The mute switch 143 is also turned off in the same manner as described above.

Further, the slide member 56 is moved forward by the leftward movement of the moving plate 52, and as a result, the head stand 7I7 is moved rightward, and the rear idler gear 28 is separated from the reel unit 5 and moved forward. The idler gear 28 is engaged with the reel unit 5, and only the reel unit 5 starts rotating toward the front reel unit. Further, the front pinch roller 90 is brought into contact with the capstan 30a,
The rear pinch roller 90 is held in a 111 tlli state from the capstan 30a.

In this way, the tape transport direction is switched from the FWD side to the RF V side.In addition, for the operation of switching the tape transport direction from the REV side to the FWD side, the stop bin 341) of the second tooth 34 is moved. 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 moved to the right by engaging the claw portion 521) (shown in Fig. 18) of the plate 52, and the details are as follows. Not mentioned.

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

For example, when tape feeding to the FWD side is completed, a predetermined tension is applied to the magnetic tape at the end, and all the components of the reel unit 5 shown in FIG. 11 except the double gear 5'' are applied. It is fixed by the reaction force of the tension.Therefore, only the double gear 5f continues to idle with respect to these fixed members via the felt plate 5h.When the tape is being transported to the FWD side, , the group of fixed members is also rotating except for the arm member 51. Also, the arm member 51 receives a biasing force caused by the rotational force, and moves the intermediate lever 7 via the floating lever 8 to move the second
The force is applied in the counterclockwise direction in Figure 2. As a result, the end detection lever 10, to which the rear end of the intermediate lever is pivoted, is urged to rotate in the 18th direction counterclockwise in the figure, and the pin 10b protruding from the end detection lever is rotated by the end detection lever. 14 while sliding in contact with the mountain-shaped protrusion 141),
The protrusion 14c of the end detection gear and the bottle 10b never engage. However, when the group of parts 44 of the reel unit 5 excluding the double gear 5 becomes fixed together with the tape stop F, the force biasing the end detection lever 10 also disappears, and the protrusion 14C of the end detection gear 14 moves to the end. It engages with the bottle 10h of the detection lever. Therefore, the end detection lever 10 moves upward, and the start trigger lever 73 rotates clockwise in FIG. 18 via the lever A12. Below is the F by pressing the switch mentioned above.
The tape transport direction is switched by exactly the same operation as the switching operation of the tape transport direction from the WD side to the RE V 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, the FF operation (tape forwarding operation) and the REW operation (tape rewinding operation) will be explained.

For example, when performing FF operation during tape playback, as shown in FIGS. 24 and 25, the longitudinal operation lever 1 for Fr operation is
Press 13 to move it backwards.

Then, via the lever J142, Mu 1 to Suitsuji 1
43 is turned on. Further, the longitudinal bin 121 protruding from the left end of the head stand 47 is pushed to the left by the tapered portion 113a of the longitudinal operation lever 113, thereby moving the head stand 47 to the left by a predetermined amount, and the magnetic head 49, the contact state of the magnetic tape is loosened.

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

Therefore, the gear transmission mechanism 13 provided on the swing lever
The first stage gear 132 of No. 5 meshes with the gear portion 27a of the rear flywheel 27, and the final stage gear 134 meshes with the small diameter gear portion of the double gear 5f of the rear reel unit 5. On the other hand, by moving the head stand 47 to the left by pushing the longitudinal operation lever 113, the pair of idler gears 28
f111f has been removed from the reel unit 5. J:
As a result, the rear reel unit 5 rotates at high speed for one rotation, and the tape is rapidly forwarded.

When performing the REW operation, this is done by pressing the longitudinal operating lever 114 for R\V operation. That is, the protrusion 114C of the longitudinal operating lever 114 is pressed against the lever H12.
6, the lever H is rotated clockwise in FIG. 25, and the first gear 132
and the final stage gear 134 are respectively the front flywheel 27
and meshes with the reel unit. Note that the leftward movement of the head stand 47 is performed using the tapered portion 1 of the longitudinal operation lever 114.
14a engages with a longitudinal bin 121 provided on the head stand 47.

When the tape reproduction is finished and the cassette half is to be ejected, the longitudinal operating lever 113 for FF operation and the longitudinal operating lever 114 for REW operation may be pushed simultaneously. Part 2
By simultaneously pressing the longitudinal levers of the tree, the intermediate lever 138 (for example, shown in FIG. (6) shown in Figure 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. For example, the switch 150 shown in FIG. 24 is also operated, so the electromagnetic solenoid 86 (see FIG. 23) is turned off, and the coil spring 82 is turned off.
The lever E83 is returned to the state shown in FIG. 17 by the action of FIG. Therefore, the pin 83C provided on the lever E83 can engage with the convex portion 3'9Q formed on the right end portion of the control plate 39. As a result, the return of the three control plates to the most backward movement position (rightward movement limit position) is prohibited.

In other words, the state in which the pin 34a to the slot 1 of the second gear 34 is engaged with the regulating portion 39d of the control plate 39 is maintained, and the second gear 34 does not rotate when the power is turned on again. This prevents unnecessary switching of the tape 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 saw set deck is mounted is turned off.

Effects of the Invention As detailed above, in the decking of the cassette 1 according to the present invention, the first gear (33) is used to reciprocate the head stand (47) which is movable in a direction substantially perpendicular to the tape drive (X) direction. and a second gear (3) for rotating the magnetic heads (4) rotatably provided around an axis substantially parallel to the moving direction of the head mount.
4), and the first gear and the second gear are provided with a rotational force 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 cullet 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 engaging the transmission mechanism. Therefore, the magnetic head rotates only after the head stand moves and the magnetic head is completely detached from the magnetic tape, thereby preventing damage to the magnetic tape or generation of noise.

Further, in the cassette deck according to the present invention, the first gear rotates 360 degrees, so that the head stand performs forward and backward movements, and the second gear rotates 180 degrees.
The rotation causes the magnetic head to rotate 180 degrees. Therefore, the mutual timing of the reciprocating motion and rotational motion of the magnetic head can be ensured and optimized.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a cassette deck according to the present invention, FIG. 2 is an exploded perspective view of the internal structure of the cassette deck, and FIGS. 3 to 8 are partial detailed perspective views of the internal structure.
FIGS. 9 and 10 are a plan view and a back view of a partial structure of the nucleus 65, respectively, and FIGS. 11 to 18.
The figures are diagrams showing details of the internal structure, Figures 19 to 26.
The figure is a diagram for explaining the operation of the cassette deck. Explanation of symbols for main parts 1...Cassette deck 2...Housing 2a...Front area 3...
- Chassis 3a, 3f...Bending portions 3c, 5m, 56a, 95a, 126d. 140...Elongated hole 3d...Support beam f'JI5...Reel unit 5a...Rotation shaft 5b...
・Reel 5G...Color 5d...
・Bushing 5e... Expanded diameter part 5f...
・Double gear 5Q, 5Q, 30b, 35, 40, 41° 60.70, 76.82, 84, 103° 104.11
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, 13Bd---... Bin 7b, 64a... Opening 7c, 56c... Notch 8... Idle lever 10... End detection Levers 10a, 14c, 33f, 39a, 3'9b. 39c, 42a, 47a, 49a,! 56e. 81a, 99c, 99e, 113c. 114C...Protrusion 11...Sub-chassis A 12...Lever A 14...End detection gears 14a, 39h, 47b, 100b. 140a...Convex portion 14b...Protrusion 16,'17,18.19.61,132'. 133.134... Gear 20.135... Gear transmission mechanism 22...
・Worm 23・・Self・・Pulley 24・・・・
Motor 24a...Small pulley 25...
... Belt 27 ... Flywheel 27
a, 27b...Gear portion 28...Idler gear 30...Support lever 30a...Capstan 33...
...First gear 33b... Partial tooth portions 33c, 33d, 34c, 34d... Missing tooth portion 3
4... Second gears 34a, 34b... Stop bin 36.124
...Plate 39...Control board 39d...
Regulation part 390... Convex part 42...
...Lever B44...Lever C47...
- Head stand 49... Magnetic heads 51a, 123... Claw members 51b, 99d... Spring member 52... Moving plates 52a, 52b... ...Claw portion 53...Lever D 54.66...Spring 56...Slide member 56d, 113a, 114a...Tapered portion 5
7...Five bearing members...Fan gear. 64...Regulation member 65...Screw 69...Prohibition lever 69a...Engagement recess 69b...Engagement protrusion 73... ...Start trigger lever 73a...
...One end part 73b, 83b, 126b, 129c ...Second @ part 75...Magnetic head switching command rod 77.86
......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... Moving member 96a... ...
Left end portion 98...Cassette holder 98a/old/
・Swinging support shaft 99...Top part IJ 1o
o... Right side member 101... Moving member
102... Lever F106...
Reel hole 107... recess 111...
...Subchassis C 113,114...Longitudinal operation lever 115.1
16... Operation button 121... Longitudinal bin 124a... Upper end protrusion 126 Old... Lever H129... Lever 1 130... Swinging lever 138... Intermediate lever 140b... Rear right edge 142... Levy J 143... Mute switch 146... Bracket

Claims (1)

[Claims] a head stand that is reciprocally movable in a direction substantially perpendicular to the tape transport direction; and a head stand that is provided on the head stand so as to be rotatable between two angular positions about an axis that is substantially parallel to the moving direction of the head stand. a magnetic head; a tape transport direction switching means for determining a tape transport direction corresponding to the angular position of the magnetic head; a head stand drive mechanism including a first gear that reciprocates the head stand by rotation; A head rotation mechanism including a second gear that rotates the magnetic head, and a gear transmission mechanism that can mesh with the first and second gears to apply rotational force from a single drive source to the first and second gears. a rotational force imparting mechanism that causes the second gear to mesh with the gear transmission mechanism after the first gear meshes with the gear transmission mechanism; The 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 first gear in a direction to mesh with the gear transmission mechanism, and when the first gear rotates 360 degrees, the head stand performs forward and backward movements, and the second gear A cassette deck characterized in that the magnetic head rotates 180 degrees when a gear rotates 180 degrees.