JPS6230186Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a device that is most suitable for application to a mode switching device such as a tape recorder, and uses a rotating cam driven by a motor and a rotating cam that moves from a backward position to a backward movement position. The drive lever is provided with a drive lever that is driven to the forward movement position against a spring, and a lock lever that is engaged with the drive lever by the spring to lock the drive lever in the forward movement position, and the lock lever is moved in the locked state. This invention relates to a device configured to unlock the drive lever by moving it against a spring to a non-engaged position.

As is well known, in this type of device, a drive lever is used to switch modes, for example, but the purpose of driving the drive lever with a rotary cam is to
The purpose is to provide strong driving force to the drive lever. Therefore, when the drive lever is locked in the forward movement position, the lock lever receives a strong reaction force from the drive lever.

For this reason, conventionally, a strong spring is used as a biasing spring for the lock lever to stabilize the above-mentioned locked state, but since the spring is strong, the lock lever is moved to the disengaged position against the spring and the drive lever is moved to the non-engaged position. A strong force is required to release the lock, and in the past, it was common to use a large, high-output electromagnetic plunger to release the lock.

The present invention attempts to provide a device that can release the lock with an extremely weak force. An embodiment in which the present invention is applied to a cassette tape recorder will be described below with reference to the drawings.

First, according to Figures 1 and 2, select FWD mode,
An overview of switching between FF/REW modes will be explained.

A pair of reel shafts 2, 3 and a capstan 4 are arranged on a mechanical board (see Fig. 3) 1.
The cassette 5 is engaged with these and mounted horizontally on the mechanical board 1. A head board 6 is mounted on the mechanical board 1 so as to be able to reciprocate in the directions of arrows a and a', and a recording/reproducing head 7 and an erasing head 8 are mounted above it. Further, a pinch roller 9 is disposed on the head substrate 6 and is rotated in the directions of arrows b and b' in conjunction with the movement of the head substrate 6 in the directions of arrows a and a'. A mode switching lever 11 is arranged at the bottom of the mechanical board 1 so as to be rotatable around a fulcrum shaft 12, and a pin 13 implanted on one end 11a of the lever 11 connects to a long hole 14 provided in the mechanical board 1. The tip 6 of the head board 6 is inserted through and extended upward.
It is configured so that it can come into contact with a part of a.

First, in the STOP mode, as shown in FIG. 1, the head board 6 and the mode switching lever 11 are respectively at the positions of the imaginary lines. When the play button or the record button is pressed, the mode switching lever 11 is rotated in the direction of arrow c and moved to the position shown by the solid line, and at the same time, the head board 6 is moved in the direction of arrow a to the position shown by the solid line. be done. At this time, the head board 6 is pulled in the direction of arrow a via a limiter spring (not shown) and positioned at the position indicated by the solid line. As a result, the re-heads 7 and 8 are inserted into the cassette 5 and come into contact with the tape (not shown), and the pinch roller 9 is rotated in the direction of arrow b to press the tape to the capstan 4, and the FWD mode (playback) is activated. state or recording state). When the fast forward button or rewind button is pressed in this FWD mode, the mode switching lever 11 is rotated in the direction of arrow c' as shown in FIG. Push this back against the limiter spring in the direction of arrow a′. As a result, both heads 7 and 8 are moved back relative to the tape, and the pinch roller 9 is
It is rotated in the direction b' and separated from the capstan 4, and switched to the FF mode or the REW mode (queue state or review state). If the fast forward button or rewind button that has been pressed is released, the FWD mode shown by the solid line in FIG. 1 is returned to.

Next, details of the FWD mode and FF/REW mode switching device will be explained.

First, as shown in FIG. 4, FIG. 5, FIG. 8, and FIG.
A motor 18 is attached on top, and this motor 18 serves as two motors, one for FWD and one for FF/REW. A cylindrical portion 19a is integrally provided above the center of the rotor 19 of this motor 18, and a pulley 20 is provided at the lower end of the cylindrical portion 19a.
is provided. Further, a drive gear 22 fixed to a motor shaft 21 is provided at the upper part of the cylindrical portion 19a, and the upper end of the motor shaft 21 extends above the drive gear 22 by a predetermined length. Note that the drive gear 22 projects upward from an opening 23 provided in the mechanical board 1.

Next, the mechanical power plunger device 25 driven by the motor 18 will be explained with reference to FIGS. 3 to 7.

A pulley 27 is fixed to an intermediate shaft 26 that is supported between the mechanical board 1 and the chassis 17, and a belt 27 is attached between this pulley 27 and a pulley 20 of the motor 18.
8 is wrapped around it. A drive gear 29 is fixed to the intermediate shaft 26, and when the motor 18 rotates forward and backward in the direction of arrow d or d' in FIG. 14, the drive gear 29 is driven to rotate forward or backward in the direction of arrow e or e'. It is configured to A rotating shaft 3 on which a partially toothed gear 30, which is intermittently driven in forward and reverse rotation by a driving gear 29, is supported between a mechanical board 1 and a chassis 17.
It is fixed at 1. In addition, 180 for gear with missing teeth 30
A pair of notches 32a and 32b facing each other at .degree. are provided. A rotating cam 34 having a bilaterally symmetrical shape is fixed to the rotating shaft 31. On the other hand, the mode switching lever 11 has a substantially L-shape, and a cam follower roller 35 that comes into contact with one side of a rotary cam 34 is pivotally attached to the other end 11b. The mode switching lever 11 is urged to rotate in the direction of arrow c' in FIG. 4 by a return spring 36, and the cam follower roller 35 is pressed against the rotating cam 34 by the force of the spring. A lock release lever 38 is arranged on the mechanical board 1 at a position opposite to the mode switching lever 11 with the rotating cam 34 in between. This lock release lever 38 has a T-shape, and one end 38a thereof is rotatably supported on the upper end of a fulcrum shaft 39 which is installed vertically through the mechanical board 1. A cam follower roller 40 pivotally attached to the lock release lever 38 projects downward from an opening 41 provided in the mechanical board 1 and is brought into contact with a side of the rotating cam 34 opposite to the cam follower roller 35. . The lock release lever 38 is urged to rotate in the direction of the arrow f in FIG. There is. A lock lever 4 is attached to the lower end of the fulcrum shaft 39 at the bottom of the mechanical board 1.
5 are rotatably supported. This lock lever 45 has an L-shape and is biased to rotate in the direction of arrow g in FIG.
1 is pressed against a locking roller 44 pivotally attached to the leading edge of the other end 11b. In addition, part 45
A recess 47 for locking the roller 44 is provided in a. In addition, a pin 48 implanted on the other end 45b of the lock lever 45 is projected above an opening 49 provided in the mechanical board 1 to release the lock release lever 38.
It is pressed clockwise in FIG. 4 by the side surface of one end 38a. A sub lock lever 51 is arranged on the other end 38b side of the lock release lever 38. This sub-lock lever 51 is almost L-shaped, and a horizontal arm portion 51a is connected to the other end 38 of the lock release lever 38.
b, and a vertical arm portion 51b extends below the mechanical board 1. This sub-lock lever 51 is rotatably supported on a support member 52 fixed on the mechanical board 1 via a horizontal fulcrum shaft 53.
It is also biased to rotate in the direction of arrow k in FIG. 6 by a locking spring 54. A locking pin 55 is attached to the upper part of the other end 38a of the lock release lever 38.
A lock hole 56 that is engaged with the pin 55 is provided in the horizontal arm portion 51a of the sub-lock lever 51.
It is set in. Note that the lock release spring 42 is made of a spring that is sufficiently stronger than the lock spring 46, and has a stronger strength than these springs 42 and 46.
The two locking springs 54 are constructed as sufficiently weak springs. Also, the distance between the pressing point of the pin 48 with respect to the lock release lever 38 and the axis of the fulcrum shaft 39
_l1 , the distance _l2 between the point of action of the lock release spring 42 on the lock release lever 38 and the axis of the fulcrum shaft 39 is configured to be sufficiently large, and the lever action of the lock release lever 38 The lock release spring 42 is configured to exert a sufficiently strong spring force against the lock spring 46.
Further, a suction rod 58 of an electromagnetic plunger 57 is connected to the tip of the vertical arm portion 51b of the sub-lock lever 51, and the suction rod 58 of the electromagnetic plunger 57 causes the sub-lock lever 51 to move against the locking spring 54 as shown by the arrow in FIG. At this time, compared to the distance l ₃ between the point of action of the locking spring 54 on the auxiliary lock lever 51 and the axis of the fulcrum shaft 53, Point of action of electromagnetic plunger 57 and fulcrum shaft 53
and the distance l ₄ is configured to be large enough,
The lever action of the auxiliary lock lever 51 allows it to be rotated in the direction of arrow k' with extremely weak force.

Next, the operation of the mechanical power plunger device 25 configured as above will be explained.

First, in the STOP mode, the mode switching lever 11 is locked by the lock lever 45 at the forward movement position shown by the phantom line in FIG. At this time, the lock release lever 38 is also locked at the forward movement position shown by the imaginary line in FIG. 4 by the auxiliary lock lever 51 as shown in FIG. 7, and the lock release force is accumulated in the lock release spring 42. .

When the STOP mode is switched to the FWD mode, the motor 18 is driven to rotate forward in the direction of the arrow d in FIG. It is rotated in the direction of arrow k' against spring 54 to the disengaged position shown. At that moment, the lock release lever 38 is unlocked, and the lock release lever 38 is rotated in the direction of the arrow f to the backward movement position shown by the solid line in FIG. 4 by the spring force of the lock release spring 42. be moved. Then, one end 38a of the lock release lever 38 kicks the pin 48, and the lock lever 45 is rotated in the direction of arrow g' against the spring 46 to the disengaged position shown in solid line in FIG. As a result of the above, the lock of the mode switching lever 11 is released instantaneously, and at the same time, the cam follower roller 40 of the lock release lever 38 rotated in the direction of the arrow f in FIG. 4 is pressed against the side surface of the rotating cam 34. The mode switching lever 11 is rotated by the return spring 36 in the direction of arrow c to the return position shown by the solid line in FIG.
It is pressed against the side opposite to the cam follower roller 40 of No. 4.

Note that the electromagnetic plunger 57 is only temporarily attracted, and then the secondary lock lever 51 is urged to rotate in the direction of arrow k in FIG. 6 by the spring 54. And at this point, the lock release lever 1
1 pin 55 is the horizontal arm portion 5 of the secondary lock lever 51
1a, and its horizontal arm 51a
is lightly pressed onto the pin 55.

Next, when the FWD mode is switched to the FF mode, the motor 18 is rotated forward at high speed in the direction of arrow d in FIG. 4, and the drive gear 29 is driven to rotate forward in the direction of arrow e in FIG. And toothless gear 3
When the trigger mechanism (not shown) of No. 0 is operated, the partially toothed gear 30 is triggered in the direction of arrow l in FIG. Then, from that moment, the partially toothed gear 30 is continuously driven to rotate in the direction of the arrow l by the drive gear 29, and thereafter the partially toothed gear 30 is driven half a rotation until the notch 32b reaches a position opposite to the drive gear 29.

When the partially toothed gear 30 is rotated in the direction of arrow l, one of the cam portions 34a is rotated as shown in FIG.
The cam follower roller 35 is pressed by the
The mode switching lever 11 is rotated to the forward position in the direction of arrow c' against the return spring 36. At the same time, the cam follower roller 35 is pressed by the other cam portion 34b, and the lock release lever 38 moves to the forward position in the direction of the forward movement position against the lock release spring 42.
It is rotated in the f′ direction. At this time, the lock release force described above is accumulated in the lock release spring 42. As the levers 11 and 38 rotate as described above, the lock lever 45 is rotated in the direction of arrow g by the spring 46, and at the moment when the mode switching lever 11 reaches the forward position, the lock lever 45 is rotated. The recess 47 engages the roller 44, and the mode switching lever 11 is locked in the forward movement position. Further, as the lock release lever 38 is rotated in the direction of the arrow f', the pin 55 is also moved in the direction of the arrow f' in FIG.
is rotated in the direction of arrow k in FIG. At the moment when the lock release lever 38 reaches the forward position, the pin 55 engages with the hole 56 of the auxiliary lock lever 51, as shown by the solid line in FIG. 7, and the lock release lever 38 is locked at the forward position. be done.

Note that when the FWD mode is switched to the REW mode, the motor 18 is driven to reverse rotation at high speed in the direction of arrow d' in Fig. 4, and the drive gear 29 is driven to reverse rotation in the direction of arrow e' in Fig. 4. . At this time, the partially toothed gear 30 is triggered in the direction of the arrow l' in FIG. 4, and the same operation as when switching to the FF mode described above is performed. However, at this time, the rotating cam 34 is rotated in the opposite direction.

Next, the swing gear switching device 61 driven by the motor 18 is shown in FIGS. 3, 4, 5, and 8.
This will be explained with reference to FIGS. 9 and 10.

A swinging lever 62 is disposed at an intermediate portion between the two reel shafts 2 and 3 on the upper part of the mechanical board 1, and a longitudinally intermediate portion of this swinging lever 62 is connected to the motor shaft 21.
It is pivotally supported at the upper end of the unit so that it can swing freely in the left and right direction.
Note that one end 62a of the swing lever 62 is guided by a lever presser 63 fixed on the mechanical board 1. At the bottom of this swinging lever 62, one end 6
A support shaft 64 parallel to the motor shaft 21 is installed between 2a and the motor shaft 21, and an intermediate gear 65 is rotatable around the axis of the support shaft 64 on this support shaft 64. It is attached so as to be slidable in the axial direction (vertical direction) of the support shaft 64. Note that this intermediate gear 65 is constantly pressed downward by a compression spring 66 fitted in a pre-compressed state to the outer periphery of the support shaft 64 between its upper surface and the lower surface of the swing lever 62. 64 is in contact with a retaining ring 67 fitted to the lower end of the ring 64. The intermediate gear 67 is lowered by the compression spring 66 as shown in FIG. 9 and engaged with the drive gear 22, and is raised by the compression spring 66 as shown in FIG. The meshing state with 22 is released. A suitable friction member 68 such as polywasher or non-woven fabric is interposed between the upper surface of the intermediate gear 65 and the lower end surface of the compression spring 66 and between the upper end surface of the compression spring 66 and the lower surface of the swing lever 62. There is. Further, the lower surface of the intermediate gear 65 is formed with a slope 69 having a substantially truncated conical shape.

Further, the other end 62b of the swing lever 62 is provided with a guide hole 71 having a convex shape, and a pin 72 provided on the intermediate portion of the one end 11a side of the mode switching lever 11 is connected to the opening of the mechanical board 1. 23 is inserted. Also, one end 6 of the swing lever 62
A switching lever 73 is arranged on the mechanical board 1 on the 2a side. This switching lever 73 is rotatably supported via a fulcrum shaft 74, and is biased to rotate in the direction of arrow m in FIG. 4 by a return spring 75. Note that one end 73a of this switching lever 73 is connected to the intermediate gear 65.
It is configured so that it can be pressed against and separated from the slope 69 of the
The other end 73b is in contact with the intermediate portion 38c of the lock release lever 38. As shown in FIG. 10, an idle lever 77 is swingably supported at the lower part of the mechanical board 1 via a fulcrum shaft 78.
An idler 80 which can be press-fitted and separated from the flywheel 79 of the capstan 4 is rotatably supported via a support shaft 64. Note that the idle lever 77 is rotated in the direction of arrow n in FIG. The pin 83 is engaged with the pin 83. Note that a reel base gear 8 is selectively engaged with an intermediate gear 65 at the lower end of both the reel shafts 2 and 3.
5,86 are provided.

Next, the operation of the swing gear switching device 61 configured as above will be explained.

First, in the STOP mode, the mode switching lever 11 and the lock release lever 83 are each rotated to the forward movement position shown by the imaginary line in FIG. has been rotated to the disengaged position shown in phantom. At this time, the pin 72 has entered into the floating portion 71a of the guide hole 71 as shown in FIG. Further, the intermediate gear 65 is lowered by a compression spring 66 and engaged with the drive gear 22, as shown in FIG.

When the STOP mode is switched to the FWD mode, the motor 18 is rotated forward in the direction of the arrow d in FIG. 4 as described above, and the mode switching lever 11 and the lock release lever 38 are respectively shown by solid lines in FIG. is moved to the return position. As a result, the pin 72 is moved from the floating part 71a of the guide hole 71 to the restricting part 71b, and the pin 72 moves the swing lever 62 to the intermediate position shown by the solid line in FIG. , 86 intermediate position]. Further, the intermediate portion 38c of the lock release lever 38 presses the other end 73b of the switching lever 73,
The switching lever 73 is rotated in the direction of arrow m' against the return spring 75 to the engagement position shown in solid line in FIG. Then, one end 73a of the intermediate gear 65 is pressed against the slope 69 of the intermediate gear 65 as shown in FIG. will be automatically canceled.

On the other hand, by switching to this FWD mode, the idle lever 77 is moved in conjunction with the mode switching lever 11.
is rotated by the return spring 81 in the direction of arrow n to the position shown by the solid line in FIG.
0 is pressed between the cylindrical portion 19a of the motor 18 and the flywheel 79. As a result, idler 8
0, the capstan 4 is rotationally driven in the direction of the arrow o by the motor 18. Further, in conjunction with the movement of the head board 6 in the direction of the arrow a in FIG. The idler 88
The take-up reel shaft 3 is rotationally driven in the direction of arrow p in FIG. At this time, as the head board 6 moves in the direction of the arrow a in FIG.
3 and is rotated about the fulcrum shaft 94 in the direction of arrow q.

Therefore, in this FWD mode, the intermediate gear 65 is not rotated at all, and no rotational load from the friction member 68 is applied to the motor 18 at all.

Next, when the FWD mode is switched to the FF mode, as described above, the motor 18 is rotated forward at high speed in the direction of the arrow d in FIG.
It is moved to the forward movement position shown in the figure and locked. As a result, the pin 72 is moved from the restricting portion 71b of the guide hole 71 to the floating portion 71a again, and the swing lever 6
The restricted state at the intermediate position of 2 is released. Also, as the lock release lever 38 moves, the switching lever 73
is rotated in the direction of arrow m in FIG. 5 by the return spring 75, and one end 73a thereof is separated from the slope 69 of the intermediate gear 65 as shown in FIG. As a result, the intermediate gear 65 is lowered by the compression spring 66 and automatically meshes with the drive gear 22.

Then, at the moment when the intermediate gear 65 is engaged with the drive gear 22, the drive gear 22 causes the intermediate gear 65 to be engaged with the drive gear 22.
is rotationally driven, and a rotational moment is applied to the swinging lever 62 in the direction of arrow r in FIG. 5 due to the rotational load from the friction member 68. As a result, the swing lever 6
2 is swung in the direction of arrow r as shown in FIG. The take-up reel shaft 3 is driven to rotate at high speed in the direction of arrow p in FIG. 5 via the intermediate gear 65.

On the other hand, by switching to the FWD mode, the pin 82 of the mode switching lever 11 causes the idle lever 77 to return to the position shown by the imaginary line in FIG.
1 in the direction of arrow n', the idler 80 is separated from between the cylindrical portion 19a of the motor 18 and the flywheel 79. Further, in conjunction with the movement of the head board 6 in the direction of arrow a' in FIG. 2, the idle lever 91 is rotated in the direction of arrow q' by the return spring 93 as shown in FIG. 88 is the take-up reel stand 89 and capstan 4
separated from between.

Note that when the FWD mode is switched to the REW mode, the motor 18 is driven to reverse rotation at high speed in the direction of arrow d' in FIG. 4, and the drive gear 22 is driven to reverse rotation in the direction of arrow d' in FIG. At the same time, the swinging lever 62 is swung in the direction opposite to the direction of the arrow r in FIG. is held, and the supply reel shaft 2 is rotated at high speed by the motor 18 via the intermediate gear 65.

Although the embodiments of the present invention have been described above, various modifications can be made based on the technical idea of the present invention.

For example, the present invention is applicable to mode switching devices in various recording and reproducing devices other than tape recorders.

In addition, the rotary cam, drive lever, lock lever, lock release lever, sub-lock lever,
The shapes of the unlocking levers and their related structures are not limited to those shown in the drawings.

Also, in the drawing, the sub-lock lever was configured to be driven to release the lock by an electromagnetic plunger, but
The unlocking can be activated by various types of mechanical triggers.

As described above, the present invention includes a rotating cam driven by a motor, a drive lever driven by the rotating cam from a backward movement position to a forward movement position against a spring,
a lock lever that is engaged with the drive lever by a spring and locks the drive lever in the forward position; and in the locked state, the lock lever is moved against the spring to the disengaged position. In the device, the rotating cam is configured to have a bilaterally symmetrical shape, and a lock release lever is provided on the side of the rotating cam opposite to the side in which the driving lever contacts. The lock release lever is interlocked with the lock lever, and the lock release lever is moved and energized toward the rotating cam, thereby energizing the lock lever toward the non-engaging position. an auxiliary lock lever that is engaged with the lock release lever by the spring and locks the lock release lever in the forward position; and the rotary cam moves the drive lever to the forward position. At the same time as the lock release lever is driven, the lock release lever is driven from the backward movement position to the forward movement position against the lock release spring, and the lock release force of the drive lever is accumulated in the lock release spring, With the drive lever in its forward position locked by the auxiliary lock lever, the auxiliary lock lever is moved to the disengaged position against the spring, thereby causing the lock release spring to release the lock lever. This is a mechanical power plunger device configured to unlock the drive lever by moving it to a disengaged position.

Therefore, according to the present invention, when the drive lever is driven to the forward position by the rotary cam, the lock release lever is simultaneously driven to the forward position, and the lock release force of the drive lever is accumulated in the lock release spring. By moving the auxiliary lock lever to the disengaged position with an extremely weak force, the drive lever is unlocked using the strong spring force accumulated in the lock release spring. Despite being able to lock stably as before, the mechanical trigger required to release the lock requires extremely weak force. If the lock is to be released using an electromagnetic plunger, a small, low-output electromagnetic plunger can be used, resulting in power savings and cost reduction, and a mechanical release mechanism can be used to release the lock. Even in this case, the structure can be significantly simplified.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a cassette tape recorder, and FIGS. 1 and 2 are plan views showing the driving conditions of the head board in the playback state and the queue/review state. , FIG. 3 is an enlarged perspective view of the main parts, FIGS. 4 and 5 are enlarged plan views showing the driving status of the drive lever and intermediate gear in the playback state and the queue/review state, and FIG. 6 is an enlarged perspective view of the main parts. Figure 7 is a cross-sectional view along the line of Figure 5, Figure 8 is a cross-sectional view along the line of Figure 4, Figure 9 is a cross-sectional view along the line of Figure 5, and Figure 10 is the driving situation of the capstan. FIG. Also, in the symbols used in the drawings, 11...
Mode switching lever, 18... Motor, 34... Rotating cam, 34a, 34b... Cam portion, 35, 40
...Camfoil roller, 36...Return spring, 3
8...Lock release lever, 42...Lock release spring, 44...Roller, 45...Lock lever,
46...Lock spring, 47...Recess, 51...
Sub-lock lever, 54...Lock spring, 55...
...pin, 56...hole, 57...electromagnetic plunger.

Claims (1)

[Scope of utility model registration request] A rotating cam driven by a motor, a drive lever driven by the rotating cam from a backward movement position to a forward movement position against a spring, and a drive lever that is engaged with the drive lever by the spring. a lock lever that locks the drive lever in the forward position, and is configured to unlock the drive lever by moving the lock lever against a spring to a non-engaged position in the locked state. The rotating cam is configured to have a left-right symmetrical shape, and a lock release lever is provided on the side of the rotating cam opposite to the contact side of the drive lever, and the lock release lever and the lock lever are interlocked, and the lock release lever is interlocked with the lock release lever. a lock release spring configured to move and energize the lock lever toward the non-engaging position by energizing the release lever toward the rotating cam;
An auxiliary lock lever is provided which is engaged with the lock release lever by a spring and locks the lock release lever in the forward position, and the rotating cam drives the drive lever to the forward position and at the same time locks the lock release lever. is driven from the backward movement position to the forward movement position against the lock release spring, and the lock release force of the drive lever is accumulated in the lock release spring, and the drive lever is moved to the forward movement position. the lock lever is moved to the non-engaged position by the lock release spring by moving the sub-lock lever to the non-engaging position against the spring while the lock lever is locked by the auxiliary lock lever; A mechanical power plunger device configured to unlock the drive lever.