JPS6127820B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a protection mechanism for a tape recorder.
In particular, it relates to products that take measures against power outages and battery power consumption.

In recent years, there has been a trend toward logic in tape recorders, and development in this direction has been actively carried out. This logic-based tape recorder has a touch switch structure for a plurality of operators that put the tape recorder into a predetermined operating state or stop state, and uses an LSI dedicated to controlling the tape recorder, and an electro-mechanical converter such as a solenoid plunger. The various movable members of the tape recorder mechanism are controlled to move to positions where they are activated or stopped in accordance with the operated operator. According to such a logic-based tape recorder, since the operator can be made into a touch switch structure, it is possible to naturally realize soft touch operation of the tape recorder operator, and a solenoid plunger corresponding to the operation of the operator can be realized. The control means for driving the tape recorder requires only one dedicated LSI, and has the advantage of being simpler in structure, smaller, lighter, and cheaper to manufacture than conventional fully mechanical tape recorders.

By the way, the logic-oriented tape recorder mentioned above is still in the development stage.
For example, there is a strong demand for detailed development in order to fully meet the needs of users in various aspects such as operation, construction, maintenance, and power consumption of solenoid plungers and the like.

The present invention has been made based on the above circumstances, and provides an extremely good tape recorder that has a simple configuration and can easily return the tape recorder to a stopped state in the event of a power outage or battery power being exhausted while the tape is running at a constant speed. The purpose is to provide a protection mechanism for

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing one embodiment of the present invention, the basic structure of a cassette tape recorder to which the present invention is applied will be described below. That is,
In FIG. 1, reference numeral 11 denotes a main chassis formed of a metal material and having a substantially rectangular shape. Approximately in the center of this main chassis 11 is a pair of reel stands 1.
2 and 13 are each rotatably supported.
Large-diameter gears 14 and 15 are coaxially and integrally provided on the pair of reel stands 12 and 13, respectively.

Also, on the substantially perpendicular bisector of the straight line connecting the rotation axes of the reel stands 12 and 13, and at the upper part of FIG. 1, there is a motor 16 for running the tape (see FIG. 2).
is provided. Rotating shaft 16 of this motor 16
1 protrudes from the surface side of the main chassis 11 and is fitted into the rotational center of the gear 17. On the surface side of the main chassis 11, a first
A friction member 18 having a protrusion 181 is provided at the bottom in the figure. This friction member 18 is connected to the gear 17
The gears 17 are interlocked with each other with a moderate frictional force, and depending on the direction of rotation of the gear 17, arrows A,
It is biased in the B direction. A rotating shaft 182 is implanted in the protrusion 181 of the friction member 18, and the rotating shaft 182 rotatably supports a gear 19 that is constantly meshed with the gear 17.

Here, when the gear 17 is rotated counterclockwise in the figure by the motor 16, the friction member 18 is rotated by the arrow B
The gear 19 meshes with the gear 15,
The reel stand 13 is rotated counterclockwise in the figure. Further, when the gear 17 is rotated clockwise in the figure, the gear 19 similarly meshes with the gear 14, and the reel stand 12
is rotated clockwise in the figure, allowing the tape (not shown here) to run in forward and reverse directions.
Further, the motor 16 is designed so that the rotational speed and direction of rotation can be changed in accordance with the operation of a tape constant speed running operating member (recording, playback) and a tape high speed running operating member (fast forward, rewinding), which are not shown. It is controlled by an electronic governor circuit or the like. The operation member for constant speed and high speed running of the tape and the operation member for stopping the tape run (not shown) (including pause) both have a touch switch structure, and when these are operated, a tape recorder (not shown) is activated. The electronic governor circuit is controlled by a control-dedicated LSI, and the motor 16 can be rotated or stopped in accordance with the operation.

Next, in the lower central part of the main chassis 11 in FIG.
are arranged so as to be slidable in the directions of arrows C and D in the figure. This head chassis 20 has one L-shaped end 201 facing toward the gear 19, and the other end 201 facing toward the gear 19.
2 are installed in parallel on the main chassis 11 with the two facing leftward in the figure. One end portion 201 of the head chassis 20 has its tip cut into two parts, and one portion 203 of the end portion 201 is inserted into the slide portion 111 formed by outsert-forming a synthetic resin material on the main chassis 11. It is supported so as to be slidable in the directions of arrows C and D in the figure.

Further, a head mounting body (indicated by a group of minute dots in the figure) 21 formed by molding a synthetic resin material is attached to the head chassis 20 from its corner to the other end 202. An erasing head 22 is attached to the left side of the head mount 21 in the figure, and a recording/reproducing head 23 is attached to the right side of the head mount 21 in the figure. Further, the head mounting body 21 includes wire bundle portions 211 and 2 for bundling lead wires (not shown) extending from the erasing head 22 and the recording/playback head 23.
12,213 are formed.

Here, a long substantially rectangular recess 214 is formed along the direction of the one end 201 in a portion of the head mount 21 corresponding to the recording/playback head 23;
A sphere 215 is loosely fitted into the recess 214 . Furthermore, a slide portion 112 having substantially the same shape as the slide portion 111 is formed by outsert in a portion of the main chassis 11 corresponding to the corner portion of the head chassis 20. Then, both ends of the substantially rectangular leaf spring 24 are attached to the slide portion 11.
The head chassis 20 is supported by the main chassis 11 by inserting the leaf springs 24 into the main chassis 1 and 112, respectively, and supporting the leaf springs 24 in an opposite direction so that the intermediate portions of the leaf springs 24 are slightly raised by the spheres 215.

Further, between the head chassis 20 and the main chassis 11, a head slider 25 is arranged in parallel so as to be slidable in the directions of arrows C and D in the figure.
The head sliders 25 are arranged in parallel from one end 201 to a corner of the head chassis 20, and one end 251 of the head slider 25 is inserted into and supported by the slide portion 112. Further, the other end portion 252 of the head slider 25 is formed by being bent substantially perpendicularly from the surface of the head slider 25, and is a bent engagement piece that is inserted through a through hole 113 formed in the main chassis 11 and projects to the back surface side. The head slider 25 is slidably supported by the main chassis 11 by making the width of the head slider 253 (see FIG. 2) wider than the width of the through hole 113 after passing through the through hole 113. .

The head slider 25 has a spring 26 engaged between a bent locking piece 254 formed on one side thereof and an engaging piece 114 formed as an outsert on the main chassis 11. It is biased in the direction of arrow D in the figure. Further, the spring 2 is provided between the bent locking piece 255 formed on the other side of the head slider 25 and the through hole 204 formed on the inner corner of the head chassis 20.
7 is engaged, the head chassis 20
is interlocked with the head slider 25. Further, a bent locking piece 256 formed on the other side of the head slider 25 is inserted into the through hole 204 of the head chassis 20. Therefore, when the head slider 25 is now slid by an external force in the direction of arrow C against the biasing force of the spring 26, the head chassis 20 is also pulled by the spring 27 and moved in the same direction. Also, if the external force is removed in this state, the head slider 25
is slid in the direction of arrow D by the spring 26, and at this time, the bent locking piece 256 of the head slider 25 engages with the edge of the through hole 204 of the head chassis 20, so the head chassis 20 is also slid in the direction of the arrow D. It is something that

A pinch roller 28 is provided on the main chassis 11 on the right side of the head chassis 20 in the figure. This pinch roller 28 has a pinch lever 29 whose side surface is bent into a substantially U-shape.
Since the pinch lever 29 is rotatably supported at one end, the other end of the pinch lever 29 is rotatably supported by a rotation shaft 115 implanted in the main chassis 11. Further, the head mounting body 21 extends to the pinch roller 28 side, and two locking portions 216 and 217 are protruded from the extended portion. The pinch lever 29 is connected to the locking portion 2.
The pinch lever 29 is biased clockwise in the figure by a torsion spring 30, which has one end secured to the pinch lever 29, is wound around the rotating shaft 115, and has the other end engaged with the rear side of the pinch lever 29. The pinch lever 29 is rotated until the locking piece 291 formed at one end of the pinch lever 29 comes into contact with the locking portion 217. When the head chassis 20 is slid in the direction of the arrow C as described above, the pinch lever 29 is also rotated clockwise in the figure by the biasing force of the torsion spring 30, and the pinch roller 29 is attached to the capstan 31. 28 is pressed. This capstan 31 is the second
This serves as the rotation axis of the flywheel 32 shown in the figure, and is inserted into the main chassis 11 from the back side to the front side so as to be rotatable without wobbling.

Further, on the left side of the head chassis 20 of the main chassis 11 in the figure, an eject member 33 is supported so as to be slidable in the directions of arrows E and F in the figure. This eject member 33 is the main chassis 1
1, it is formed into a substantially rod-like shape extending from the upper end to the lower end in the figure. The eject member 33 has a substantially T-shaped transparent hole 331 formed at one end thereof fitted into a slide portion 116 formed as an outsert in the main chassis 11 and protruding in a substantially T-shaped side surface. A shaft 117 formed as an outsert on the main chassis 11 is slidably supported by pressing it with a rear presser ring 118 which is loosely inserted into a through hole 332 of the shape shown in the figure formed at the end. In addition, the eject member 33 has a spring 34 engaged between a bent locking piece 333 formed approximately at the center thereof and an engagement shaft 119 formed as an outsert on the main chassis 11. It is biased in the direction of arrow F.

Here, a lock portion 334 is formed at one end of the eject member 33 and protrudes substantially perpendicularly to the surface of the main chassis 11. When the cassette lid (not shown), which is normally biased in the open direction, is closed, a portion of the cassette lid is locked by the lock portion 334, and the cassette lid is maintained in the closed state. Here, as mentioned earlier, the plurality of controls for turning this cassette tape recorder into predetermined operating states and stopping states have a touch switch structure, but they are used to open the cassette lid from the closed state. The eject operator (not shown) has a mechanical structure such as a push type or a piano touch type. When the eject operator is operated, the eject member 33 is slid in the direction of arrow E against the biasing force of the spring 34 in direct or indirect association with this operation. Then, the lock portion 334 of the eject member 33 separates from the cassette lid, and the cassette lid is opened.

Further, on the main chassis 11, an erroneous erasure prevention switch 35 and a cassette detection switch 36 are provided near one end of the eject member 33.

Next, the structure of the back side of the main chassis 11 will be explained with reference to FIG. First, a control member 37 having a symmetrical shape in the figure is supported in a portion on the back surface of the main chassis 11 where the pair of reel stands 12 and 13 are supported so as to be slidable in the directions of arrows G and H in the figure. There is. This braking member 37
are engagement pieces 371, 37 formed at both ends thereof.
2 is a long hole 37 formed in the main chassis 11
3, 374 and engages with the sides of the elongated holes 373, 374 on the surface side of the main chassis 11, and its center part is sandwiched between the motor 16 and the main chassis 11, so that it can freely slide. It is supported by The braking member 37 has a long hole 37 formed approximately in the center thereof.
The center portion is wound around a shaft 376 formed as an outsert on the main chassis 11 and is loosely fitted into the brake member 5, and both ends are engaged with engagement pieces 377 and 378 formed on both sides of the braking member 37. Normally, it is biased in the direction of arrow H by a torsion spring 38.

Here, the movement of the braking member 37 by urging in the direction of the arrow H is caused by brake elements 391 and 392 provided at both ends of the braking member 37 and extending through the elongated holes 373 and 374 and protruding toward the surface side of the main chassis 11.
However, the braked rings 121, 131 (see Fig. 1) are coaxially formed integrally with the reel stands 12, 13.
until it touches the position. Therefore, in the normal state, both reel stands 12 and 13 are braked so that they do not rotate. Furthermore, a protrusion 379 extending downward in FIG. 2 is formed approximately at the center of the braking member 37. The tip of this protrusion 379 faces the bent engagement piece 253 of the head slider 25.

Next, a small-diameter gear 40 is formed coaxially and integrally with the flywheel 32 . The flywheel 32 is connected to a motor 41, which is separate from the motor 16, via a belt 42 so as to be able to transmit rotational force, and is rotated at a constant speed clockwise in the figure around the capstan 31. and,
On the right side of the gear 40 of the main chassis 11 in the drawing, a large diameter gear 43 that can mesh with the gear 40 is rotatably supported. This gear 43 has two notches 4 at predetermined positions that do not mesh with the gear 40.
31,432 are formed. Further, on one surface of the gear 43 facing the main chassis 11, a cam portion 434 is formed, which has a flat portion 433 in a portion and a curved portion in the shape shown in the figure. The cam portion 434 and the head slider 2
As shown in FIG. 3, one end of the drive lever 44 is interposed between the bent engagement piece 253 of No. 5 and the bent engagement piece 253 of FIG. This drive lever 44 has a screw 4 in its middle part.
41, it is rotatably supported by the main chassis 11. The drive lever 44 is
A through hole 442 formed on one side thereof and an engagement piece 44 formed as an outsert on the main chassis 11
3, a spring 444 is engaged between the two, so that the spring 444 is biased counterclockwise in the figure. Further, the other end of the drive lever 44 can be engaged with a leaf switch 45. This leaf switch 45, when turned on, generates a control signal to, for example, the above-mentioned tape recorder control dedicated LSI so as to bring the motor 16 into a rotating state corresponding to tape constant speed running.

On the other hand, a substantially ring-shaped guide groove 435 is formed on the other surface of the gear 43. Two locking portions 436, 437 are formed at predetermined positions on the inner peripheral wall of the guide groove 435, and two step portions 438, 439 are formed on the outer peripheral wall at positions substantially opposite to the locking portions 436, 437. It is formed. A substantially L-shaped lock member 46 having a lock portion 461 formed at one end, which is loosely fitted into the guide groove 435,
The corner portion thereof is rotatably supported by a rotation shaft 462 formed as an outsert in the main chassis 11. The other end of the locking member 46 has a substantially arc-shaped through hole 463 formed in the main chassis 11.
A pin 464 is formed that extends through the main chassis 11 and projects toward the surface side of the main chassis 11. The lock member 46 has a pin 46 protruding from the other end.
5, one end is wound around the rotation shaft 462, and the other end is engaged with an engaging portion 466 formed as an outsert in the main chassis 11. It is biased counterclockwise.

Here, as shown in FIG. 2, when the lock portion 461 of the lock member 46 is engaged with the locking portion 436 of the guide groove 435, one end portion of the drive lever 44 is connected to the cam portion 434. Flat part 43
3, and a spring 44 is attached to the drive lever 44.
As a result, the gear 43 is biased counterclockwise in the figure by the biasing force applied by the gear 43. However, since the lock portion 461 is engaged with the locking portion 436, the gear 43 is biased counterclockwise in the figure. Rotation is prevented.

As shown in FIG. 3, one end of a lock release lever 47 is rotatably connected to one end of the lock member 46. As shown in FIG. This lock release lever 47 is located at the center of the main chassis 11.
It is rotatably supported by a rotation shaft 471 formed as an outsert. The other end of the lock release lever 47 is connected to a drive piece 481 of the solenoid plunger 48.

Here, on the left side of the gear 40 of the flywheel 32 in the main chassis 11 in FIG. 2, a gear 49 that can mesh with the gear 40 is rotatably supported. This gear 49 has a notch 491 formed at a predetermined position that does not mesh with the gear 40. Further, on one side of the gear 49 facing the main chassis 11, a part of the flat portion 4 is provided.
A cam portion 493 having a cam portion 92 and the other portion thereof being curved in the illustrated shape is formed. Then, the cam portion 4
One end of the drive lever 50 is located near the drive lever 93, as shown in FIG. The drive lever 50 is rotatably supported by the main chassis 11 at its intermediate portion by a screw 501. The drive lever 50 is configured such that a spring 504 is engaged between a through hole 502 formed at the other end and an engagement piece 503 formed as an outsert on the main chassis 11. Forced clockwise. In addition, the drive lever 5
The other end of the leaf switch 51 can be engaged with a leaf switch 51. When the leaf switch 51 is turned on, it generates a control signal to the tape recorder control LSI so as to cause the motor 16 to rotate in a state corresponding to high-speed tape running.

Here, as shown in FIG. 4, a head return lever 52 is attached to the drive lever 50 so as to overlap with it. This head return lever 52 is
It rotates around a screw 501 coaxially with the drive lever 50, one end of which extends beyond the drive lever 50, and the extending tip of which is connected to the main chassis 11.
A bent engagement piece 522 (first
(see Figures 1 and 2). As shown in FIG. 1 again, the bent engagement piece 522 faces the engagement piece 205 formed protruding from the side of the head chassis 20.

Further, at the other end of the drive lever 50, a second
As shown in the figure, a pin 505 is provided to protrude.
One end engages with this pin 505, the other end engages with the bottom central part of the braking member 37 (see FIG. 4), and the main chassis 11 is approximately at the center thereof.
A brake release lever 53 is provided which is rotatably supported by a rotation shaft 531 formed as an outsert.

On the other hand, the other surface of the gear 49 is formed with a substantially circular cam portion 496 in which two locking portions 494 and 495 are formed at predetermined positions. Further, two guide walls 49 having the shape shown in the figure are provided on the other surface of the gear 49 at positions substantially opposite to the locking portions 494 and 495.
7,498 have been formed. A substantially L-shaped lock member 54 having a lock portion 541 formed at one end that can engage with the cam portion 496 is rotated by a rotation shaft 542 formed as an outsert in the main chassis 11 at the other end. Supported for free movement. This locking member 54 is connected to the drive piece 551 of the solenoid plunger 55 at its corner, and is located between a locking piece 543 formed at the corner and an engaging piece 544 formed as an outsert on the main chassis 11. A spring 545 is engaged, so that it is biased counterclockwise in FIG.

Here, as shown in FIG.
94, one end of the drive lever 50 is connected to the flat part 492 of the cam part 493.
, and a spring 504 is attached to the drive lever 50.
As a result, the gear 49 is biased counterclockwise in the figure due to the biasing force applied by the gear 49, but since the lock portion 541 is engaged with the locking portion 494, the rotation of the gear 49 is prevented. is being prevented.

In the cassette tape recorder constructed as described above, the operation when the tape is running at a constant speed will first be described. Now, assuming that the cassette tape recorder is in a stopped state, the notch 431 of the gear 43 is in a position facing the gear 40, as shown in FIG. Although the gear 43 is biased counterclockwise in FIG. 5 by the lever 44, the locking portion 436 is engaged with the locking portion 461 of the locking member 46, so that the gear 43 is prevented from rotating. In this state, when a power switch (not shown) of the cassette tape recorder is turned on, the motor 41 is energized and rotated. Therefore, the flywheel 32 and the gear 40
is rotated clockwise in FIG. 5, but is not yet meshed with the gear 43.

In this state, it is assumed that, for example, a playback operation member (not shown) (touch switch structure) is operated as an operation member for running the tape at a constant speed. Then, the LSI determines that this playback operation member has been operated and performs the corresponding operation.
The LSI outputs a drive signal to the solenoid plunger 48, and also outputs a control signal for switching a tape recorder circuit section (not shown) to a reproduction state. Then, the solenoid plunger 4
8 is driven, its driving piece 481 is retracted as shown in FIG. Therefore, the lock release lever 47 is rotated counterclockwise in the figure, and the lock member 46 connected to the lock release lever 47 is rotated.
is rotated clockwise in the figure against the biasing force of the torsion spring 467. Then, the lock portion 461 of the lock member 46 engages the locking portion 43 of the gear 43.
6, the gear 43 is rotated slightly counterclockwise in the figure by the urging force previously applied from the drive lever 44, and is now engaged with the gear 40.

Hereinafter, the gear 43 is replaced by the gear 40 as shown in FIG.
It is rotated counterclockwise in the figure by the rotational force of .
Therefore, one end of the drive lever 44 is pushed up by the curved portion of the cam portion 434, and the drive lever 44 is rotated clockwise in the figure against the biasing force of the spring 444. Then, drive lever 4
One end of the head slider 25 contacts the bent engagement piece 253 of the head slider 25, and moves the head slider 25 upward in the figure. Therefore, as described above, the head chassis 20, which is in an interlocking relationship with the head slider 25, is also slid upward in FIG.
At this time, the bent engagement piece 253 comes into contact with the protrusion 379 of the brake member 37 and pushes the brake member 37 upward in FIG. 2.

Here, the solenoid plunger 48 is energized and driven for the time required for the locking portion 461 of the locking member 46 to disengage from the locking portion 436 of the gear 43. After the solenoid plunger 48 disengages, the driving piece 481 is driven by an external force. It can be freely moved in and out of the solenoid plunger 48. Therefore, after the lock portion 461 is released from the locking portion 436, it is pressed against the inner circumferential wall of the guide groove 435 by the urging force applied to the lock member 46 by the torsion spring 467.

Therefore, as the rotation of the gear 43 progresses, as shown in FIG.
is locked by a locking portion 437 of the gear 43. At this time, the notch 432 of the gear 43 is in a position facing the gear 40, the gear 43 no longer meshes with the gear 40, and the rotation of the gear 43 is stopped. Also, at this time, one end of the drive lever 44 is connected to the cam portion 43.
4 is pushed up as far as possible in the figure, and one end of the drive lever 44 touches the curved part of the cam part 434 and the flat part 43 as shown in the figure.
3 and the biasing force of the spring 444 eventually biases the gear 43 in the counterclockwise direction in the figure.
Since the gear 43 is locked to, rotation of the gear 43 is prevented.

In this state, the head slider 25 and the braking member 37 are also pushed up as far as possible in the figure, the head chassis 20 is also slid as far upward as in FIG.
3 is brought into contact with a tape (not shown), and the pinch roller 28 is brought into contact with the capstan 3 via the tape.
1. At the same time, the brake elements 391 and 392 of the brake member 37 are completely separated from the braked rings 121 and 131 of the reel stands 12 and 13, and the reel stands 12 and 13 are no longer braked. Furthermore, at this time, the leaf switch 45 (see FIG. 2) is turned on by the other end of the drive lever 44, so the motor 16 is rotated at a rotation speed and rotation direction corresponding to the tape constant speed running state, and the reel is rotated. The platforms 12 and 13 are rotated, and stable tape playback is performed here.

Here, when a recording operation member (touch switch structure) (not shown) is operated as an operation member for constant speed running of the tape, the LSI outputs a drive signal to the solenoid plunger 48 and puts the tape recorder circuit into the recording state. Outputs a control signal to switch to provide Then, the head chassis 20 is moved in the same manner as described above, and stable recording is performed.

It is also assumed that a stop operation member (not shown) (touch switch structure) is operated in the tape playback state as described above. Then, the LSI determines that the stop operation member has been operated while the tape is running at a constant speed, and outputs a drive signal to the solenoid plunger 48 again. When this solenoid plunger 48 is driven, as shown in FIG.
1 is pulled in, and the lock part 46 of the lock member 46
1 is released from the locking portion 437 of the gear 43. Then, the gear 43 is rotated counterclockwise in the figure by the biasing force previously applied by the drive lever 44, and the locking part 436 is again locked to the locking part 461 as shown in FIG. In this state, the gear 43 is prevented from rotating. At this time, since the drive lever 44 is rotated counterclockwise in the figure by the biasing force of the spring 444, the head slider 25 is also rotated by the biasing force of the spring 444.
The braking member 37 is retracted by the urging force of (see Fig. 1) and returned to its original position, and the head chassis 2
0 and the pinch roller 28 return to their original positions, and the brakes 391, 392 move to the reel stand 12,
13 braked rings 121, 131,
The leaf switch 45 stops the rotation of the off-frame motor 16 and the reel stands 12, 13, and the cassette tape recorder returns to its original stopped state.

Here, in the tape playback state shown in FIG. 8, when the lock part 461 is released from the locking part 437, the notch part 431 of the gear 43 as shown in FIG.
The gear portion formed between and 432 is the gear 40
The rotational penetration of the flywheel 32 suppresses the biasing force of the drive lever 44 of the gear 43 in the counterclockwise direction in the figure, so that the locking part 431 is prevented from being hit by the locking part 461. There is.

Furthermore, the same explanation as above can be given when the stop operation member is operated in the tape recording state.

Next, the operation in a tape running state at high speed will be explained. Now, assuming that the cassette tape recorder is in a stopped state, the gear 49 is in a position where its notch 491 faces the gear 40, as shown in FIG. The lock portion 54 of the lock member 54 is biased counterclockwise in FIG. 10 by the lever 50.
The locking portion 494 is locked to the gear 49 to prevent rotation of the gear 49. When the power switch is turned on in this state, the motor 41 is driven to rotate as described above, and the gear 40 is rotated clockwise in FIG.
It doesn't mesh with 9.

In this state, it is assumed that, for example, a fast-forward operation member (not shown) (touch switch structure) is operated as an operation member for high-speed tape running. Then, the LSI determines that this fast-forward operation member has been operated,
The LSI outputs a drive signal to the solenoid plunger 55. Then, the solenoid plunger 5
5 is driven, its driving piece 551 is retracted as shown in FIG. Therefore, the lock member 54 resists the biasing force of the spring 545,
It is rotated clockwise in the figure. Then, the lock portion 541 of the lock member 54 engages the locking portion 494 of the gear 49.
The gear 49 is rotated slightly counterclockwise in the figure by the biasing force previously applied from the drive lever 50, and is now engaged with the gear 40.

Hereinafter, the gear 49 is the gear 4 as shown in FIG.
It is rotated counterclockwise in the figure by a rotational force of 0. Therefore, one end of the drive lever 50 is pushed by the curved portion of the cam portion 493, and the drive lever 50 is rotated clockwise in the figure against the biasing force of the spring 504. Then, drive lever 5
0 pin 505 presses one end of the brake release lever 53, and the brake release lever 53 is rotated counterclockwise in the figure. Therefore, the other end of the brake release lever 53 comes into contact with the center of the bottom of the brake member 37, and pushes the brake member 37 upward in the figure against the biasing force of the torsion spring 38.

Here, like the solenoid plunger 48, the solenoid plunger 55 is energized and driven for the time required for the locking portion 541 of the locking member 54 to disengage from the locking portion 494 of the cam portion 496. Thereafter, the drive piece 551 can be freely moved in and out of the solenoid plunger 48 by external force. Therefore, the lock part 5
After the lock member 41 is released from the locking portion 494, it is pressed against the peripheral wall of the cam portion 496 by the urging force applied to the lock member 54 by the spring 545.

Therefore, as the gear 49 continues to rotate, the lock portion 541 of the lock member 54 locks as shown in FIG.
is locked by the locking part 495 of the cam part 496.
At this time, the notch 491 of the gear 49 is in a position facing the gear 40, the gear 49 no longer meshes with the gear 40, and the rotation of the gear 49 is stopped. Further, at this time, the drive lever 50 is in the state of being rotated most clockwise in the figure, and the drive lever 50 is
0 comes into contact with the contact point between the curved part of the cam part 493 and the flat part 492 as shown, and the biasing force of the spring 504 eventually biases the gear 49 in the counterclockwise direction in the diagram. However, since the lock portion 541 is locked to the locking portion 495, rotation of the gear 49 is prevented.

In this state, the brake member 37 is pushed up the most upward in the figure, and the brake elements 391, 39
2 is the braked ring 121 of the reel stand 12, 13,
131, and no brake is applied to the reel stands 12, 13. Furthermore, at this time, the leaf switch 51 (see FIG. 2) is turned on by the other end of the drive lever 50, and the LSI first determines that the fast-forward operation member is operated. By this, the motor 16
is rotated at a speed and direction corresponding to the tape fast-forwarding state, the reel stands 12 and 13 are rotated, and stable tape fast-forwarding is performed.

Here, when a rewind operation member (not shown) (touch switch structure) is operated as an operation member for high-speed tape running, the LSI outputs a drive signal to the solenoid plunger 55. Then, when the leaf switch 51 is turned on in the same manner as above,
Since the LSI determines that the rewinding operation member has been operated, the motor 16 is rotated at a rotational speed and direction corresponding to the tape rewinding state, and stable tape rewinding is performed.

Further, assume that the stop operation member is operated in the tape fast forwarding state as described above. Then, the above
The LSI determines that the stop operation member has been operated in the fast forward state and outputs a drive signal to the solenoid plunger 55 again. When the solenoid plunger 55 is driven, the driving piece 551 is retracted, and the locking portion 541 of the locking member 54 is disengaged from the locking portion 495 of the cam portion 496. Then,
The gear 49 is rotated counterclockwise in the figure by the biasing force applied by the drive lever 50, and the locking part 4 is again attached to the locking part 541 as shown in FIG.
With gear 94 locked, rotation of gear 49 is prevented. At this time, the drive lever 50 is
Since the brake release lever 53 is rotated counterclockwise in the figure by the biasing force 04, no force is applied to the brake release lever 53 in the clockwise direction in the figure, and the braking member 37 returns to its original position by the biasing force of the torsion spring 38. Then, the brakes are applied to the reel stands 12 and 13. At this time, the leaf switch 51 is also turned off and the rotation of the motor 16 is stopped, and the cassette tape recorder returns to its original stopped state.

Furthermore, the same explanation as above can be given when the stop operation member is operated in the tape rewinding state.

Next, the operation when a pause (for temporarily stopping tape running) operation member (touch switch structure), not shown, is operated will be described. That is, when the tape is running at a constant speed, as shown in FIG. 8, the head slider 25 is located at the uppermost position in the figure, and the head chassis 20 is located at the uppermost position in FIG. At this time, the engagement piece 205 formed on the side of the head chassis 20 is connected to the drive lever 50.
It is located near the lower part in FIG. 1 of the bent engagement piece 522 of the head return lever 52 attached to the head.

When the pose operation member is operated in such a state, the LSI determines that the pose operation member has been operated and outputs a drive signal to the solenoid plunger 55. Then, as mentioned above, gear 4
9 is in a position as shown in FIG. At this time, the drive lever 50 and the head return lever 52
are both at the most rotated position in the clockwise direction in FIG. Push it down slightly against the biasing force. Therefore, erase head 2
2 and the recording/playback head 23 are lowered to a position where they lightly touch the tape, and the pinch roller 28 is completely separated from the capstan 31. At this time, the rotation of the motor 16 is stopped because the leaf switch 51 is turned on by the other end of the drive lever 50 and the LSI determines that the pause operation member has been operated. Ru. Then, the pinch roller 28 separates from the capstan 31, the constant speed running of the tape is stopped, and a pause state is realized.

Here, the above-mentioned pause operation member has a so-called dual-operable touch switch structure in which it is turned on when it is touched once, remains on even after the hand is removed, and turned off when it is touched again. Then, when the pause operation member is operated again in the pause state as described above, a drive signal is output from the LSI to the solenoid plunger 55. Then, as mentioned earlier, the gear 49 returns to the position shown in FIG. 10, and the head return lever 52 is also returned to its original position, so the head chassis 20 is again moved upward in FIG. 1 and tape playback is resumed. It will be restarted.

Also, with the pose operation member operated in advance,
Even if the tape constant speed running operation member is operated later, the pause state can be realized. In this case, the head chassis 20 is first moved upward in FIG. 1 with the head return lever 52 in the position shown in FIG. This is the result.

Here, the operation when the fast forward or rewind operation member is operated in the tape playback state will be described. That is, let us assume that the fast-forward operating member is operated in the tape playback state previously explained with reference to FIG. Then, as mentioned earlier, solenoid plunger 5
5 is driven, the gear 49 is in the position shown in FIG. 13, and the head return lever 5 is moved as in the pause state.
2, the head chassis 20 is slightly retracted. At this time, it is determined that the forward leaf switch 51 is turned on by the other end of the drive lever 50 and that the fast forward operating member is operated in the playback state.
Based on the determination by the LSI, the motor 16 is controlled to have a rotational speed and rotation direction corresponding to the fast-forward state, and the tape is fast-forwarded. At this time, since the recording/reproducing head 23 is in light contact with the tape, the cassette tape recorder ends up in a fast forward playback (queue) state.

Furthermore, when the rewind operation member is operated in the tape playback state instead of the fast forward operation member, the operation is similar to that described above, and the motor 16 is controlled so as to have the rotational speed and rotation direction corresponding to the rewind state. The cassette tape recorder enters a rewind playback (review) state.

In the queue or review state as described above, for example, the solenoid plunger 5 is
5, the cassette tape recorder returns to the playback state in the same manner as the pause state is canceled and the tape is run at a constant speed, and automatic cueing is realized. .
Further, in the state shown in FIG. 13, the solenoid plunger 55 is driven by an external operation, or the lock member 54 is rotated clockwise in the figure to disengage the lock portion 541 from the locking portion 495 of the cam portion 496. If a separate electrical or mechanical operator (not shown) is provided, it is possible to perform so-called manual music selection by switching to the tape playback state at any position in the queue or review state.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a cassette tape recorder having the basic configuration as described above, one embodiment of the present invention will be described below with reference to the drawings.

That is, FIG. 14 shows the eject member 33
This shows the details. That is, as described above, the eject member 33 is slid in the direction of the arrow E in the figure in conjunction with the operation of the eject operator.
At this time, the lock portion 334 separates from the cassette lid, and the cassette lid becomes open. Here, the eject member 33 has a slide portion 116 formed as an outsert on the main chassis 11 fitted into its through hole 331, but this fitting is made with some margin. . For this reason, the eject member 33 moves as shown by the arrow J in the figure, with the slide portion 116 as the center.
It is freely rotatable in the K direction. The eject member 33 is normally biased in the direction of arrow K by the spring 34, and the eject member 33 is rotated until the shaft 117 comes into contact with the side wall of the through hole 332.

Further, an engaging piece 335 having an inclination is formed on the lower side surface of the eject member 33 in the drawing. An engaging portion 218 that engages with the engaging piece 335 of the eject member 33 is formed at the left end of the head mounting body 21 attached to the head chassis 20 in the drawing.

Here, when the constant tape running operation member is operated, the head chassis 20 is slid upward in the figure as shown in the figure. At this time, the engaging portion 218 of the head mounting body 21 engages with the protrusion 336 of the ejecting member 33, and the ejecting member 33 moves toward the arrow J.
It will be rotated in the direction. On the other hand, a pin 476 is formed at the end of the lock release lever 47 to which the solenoid plunger 48 is connected, and is inserted through a through hole 475 formed in the main chassis 11 and a through hole 332 formed in the eject member 33. . In addition, the through hole 332 of the ejection member 33
A notch 338 is formed at the lower left end in the figure, and an engaging portion 339 that engages with the pin 476 is formed at the right end.

When the head chassis 20 is in the backward position, when the eject operator is operated, the eject member 33 is slid in the direction of arrow E. At this time, the pin 476 is inserted through the notch 338, so that the pin 476 of the eject member 33 is inserted. is not engaged, and normal ejection is performed.

On the other hand, as shown in FIG. 14, when the head chassis 20 is in the forward position (tape constant speed running state), the eject member 33 is rotated in the direction of arrow J, so that its engaging portion 339 engages with the pin 475. match. When the eject operator is operated in this state, the eject member 33 slides in the direction of arrow E, the engaging portion 339 pushes the pin 475, the lock release lever 47 is rotated clockwise in the figure, and the lock is released. The member 46 is rotated counterclockwise in the figure. Therefore, since the tape is running at a constant speed first, the locking portion 461 of the locking member 46 is locked to the locking portion 437 of the gear 43, but it is released from the locking portion 437. Then, as described above, the head chassis 20 is moved backward, and the tape stops running. At this time, the cassette lid is simultaneously opened.

Therefore, according to the eject operation mechanism as in the above embodiment, when the eject operation element is operated while the tape is running at a constant speed, the head chassis 20
is retracted and the tape stops running, and
Since the cassette lid can be opened,
It is capable of providing sufficient tape protection. In particular, with the above configuration, when the tape is running at a constant speed and the tape is no longer running at a constant speed due to a power outage or battery power being exhausted, for example, by operating the eject operator, This is extremely convenient since it is possible to return the cassette tape recorder to its original stopped state and also to remove the tape cassette.

Further, in the above description, the lock portion 461 is disengaged from the locking portion 437 in conjunction with the eject operator, but this means that an operating member is provided that allows the lock portion 461 to be disengaged from the locking portion 437 by external operation. It is sufficient if the ejection is performed after the operation has stopped.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

Therefore, as described in detail above, according to the present invention, an extremely good system with a simple configuration can easily bring the tape recorder into a non-operating state in the event of a power outage or battery power being exhausted while the tape is running at a constant speed. A protection mechanism for the tape recorder can be provided.

[Brief explanation of the drawing]

1 and 2 are front and back views showing the overall structure of a cassette tape recorder to which the present invention is applied, and FIG. 3 is a perspective view showing a mechanism for making the cassette tape recorder run at a constant tape speed. figure,
FIG. 4 is a perspective view showing a mechanism for putting the cassette tape recorder into a high-speed tape running state, and FIGS. 5 to 9 are explanatory diagrams of the operation of the mechanism shown in FIG. 3, respectively.
10 to 13 are explanatory diagrams of the operation of the mechanism shown in FIG. 4, respectively, and FIG. 14 is a configuration diagram showing an embodiment of the tape recorder protection mechanism according to the present invention. 11... Main chassis, 12, 13... Reel stand, 14, 15... Gear, 16... Motor, 1
7...Gear, 18...Friction member, 19...Gear,
20... Head chassis, 21... Head mounting body, 22... Erasing head, 23... Recording/playback head, 24... Leaf spring, 25... Head slider,
26, 27...spring, 28...pinch roller, 29...pinch.

Claims (1)

[Claims] 1. A first rotating body that rotates independently of tape running, and a non-engaging portion that is engaged with the first rotating body so as to transmit rotational force and is not engaged with the first rotating body, is in a predetermined position. a second rotary body formed therein; a guide portion formed on one side of the second rotary body; a lock member having a lock portion guided by the guide portion; first and second rotary parts formed on the side where the guide part is formed, and in which the non-engaging part of the second rotary body is placed in a position facing the first rotary body when the lock part is engaged; and the locking portion formed on the other side of the second rotating body are engaged with the first and second locking portions, respectively, and the head chassis stops tape running and moves the tape at a constant speed. a cam portion that moves the tape to a position corresponding to the running state; and a state in which the lock portion is disengaged from the first and second locking portions in response to operation of an operation member for constant speed tape running and tape running stop. an electro-mechanical converter configured to forcibly disengage the lock portion from the second locking portion by an eject operation while the lock portion is engaged with the second locking portion; 1. A protection mechanism for a tape recorder, comprising: an eject operation mechanism for setting the tape recorder in the correct state.