JPH0370868B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an operation switching device for a tape recorder that uses the rotational force of a motor to switch between playback operation, rewinding operation, etc.

(b) Prior Art In a tape recorder, the rotational force of a motor is used to displace a slide base on which a magnetic head is placed to a playback operating position to switch to a playback operating state or to a rewinding operating state. There are many devices configured to perform this, and such a technique is described in, for example, Japanese Patent Laid-Open No. 71152/1983. That is, when the operation button is pressed, the control member rotates to release the blocking force that had previously prevented the switching gear from meshing with the driving gear, meshing the switching gear with the driving gear, and switching the switching gear. By rotating the gear and displacing the slide base to the operating position by the rotational force, and displacing the switching sliding plate, the pinch roller is pressed against the capstan to establish a regeneration state. . Similarly, the rotational force of the motor is used to create a rewind or fast forward state.

(c) Problems to be Solved by the Invention In a tape recorder configured to switch operations using the rotational force of a motor, when switching from a stopped state to a playing state, or from a playing state to a rewinding state, etc. When the reel shaft rotates, there is a problem in that the tape is wound and rewound. The present invention aims to provide an operation switching device that is improved in this respect.

(d) Means for Solving the Problems The operation switching device of the present invention selectively meshes with a first gear rotationally driven by a motor and displaces a slide base between an operating position and a non-operating position. a second gear, a rotation lever provided with a locking member that locks the second gear to hold the slide base in an operating position and a non-operating position, and an engagement recess having inclined sides on the left and right sides. and is slidably displaced between a suction position and a non-suction position by rotational displacement of the rotary lever,
a sliding plate on which a suction piece is formed; a magnet that holds the sliding plate at a suction position against the biasing force of a spring by suctioning the suction piece formed on the sliding plate; a rotary lever plate that is rotatably provided and is provided with a pin that engages with the engagement recess when the sliding plate is in the non-adsorption position; and a rotary lever plate that is rotatably attached to the rotary lever plate. and a transmission gear that selectively transmits the rotational force of the motor to the take-up reel shaft or the unwind reel shaft.

(e) Effect When the operation is switched by the rotational force of the motor, the rotational force of the motor is applied to the engagement recess formed in the sliding plate in the non-adsorption position on the winding reel shaft or The rotation of the motor is transmitted to the take-up reel shaft or the rewind reel shaft by engaging a pin provided on a rotary lever plate to which a transmission gear for selectively transmitting transmission to the rewind reel shaft is rotatably mounted. This prevents power from being transmitted.

(F) Embodiment The operation switching device of the present invention will be described with reference to the drawings. 1 is a motor, the rotational force of which is transmitted to a flywheel 4 and an intermediate pulley 5 via a belt 3 suspended from a pulley 2. . Reference numeral 6 denotes a first gear attached to a capstan 7, which is the central axis of rotation of the flywheel 4;
The second gear is selectively meshed with the eleventh gear.
As shown in Figs.
A first control groove 14 having a cam surface 13 and a cam surface 13 is formed, and an eccentric second control groove 15 is formed on the surface. Reference numeral 17 designates a rotating lever which is supported by a shaft 18 and is urged to rotate counterclockwise by a spring 16, and has one end attached to the first lever.
A pin 19 that fits into the control groove 14 is provided. 20 is slidably attached by fitting a long hole 22 into a pin 21 on the chassis, and is provided with a magnetic head (not shown) and a pin 23 fitting into the second control groove 15. The slide base is biased by a spring 24 in the direction of arrow A, which is the non-operating position. Also,
A pinch roller fitting 26 is attached to the slide base 20 and rotatably supports a pinch roller 25 for driving the magnetic tape at a constant speed. 27
is a sliding plate that is mounted so that it can slide between the suction position shown in FIG. 1 and the non-suction position shown in FIG. 2 by fitting a long hole 29 into a pin 28 on the chassis; The pivot lever 17 is rotated by the pin 30.
An engagement recess 33 and a suction piece 34 are formed, which are connected to each other and have symmetrical inclined sides 31 and 32. 35 is the suction piece 3
It is a magnet placed opposite to 4,
The attraction force is small and when the sliding plate 27 slides in the direction of arrow A and the attraction piece 34 comes into contact with it, it attracts and maintains that state, but a pulse voltage is wound around it to generate magnetic flux in the opposite direction. It is configured so that the adsorption force temporarily disappears when it is supplied to a coil (not shown). 36 and 37 are the take-up reel shafts 5
3 and a winding gear and a rewinding gear provided on the rewinding reel shaft 54, 38 is an intermediate transmission gear, and as shown in FIG. The intermediate gear 41 is rotatably attached to the rotary lever plate 40 and is provided to rotate integrally with the intermediate pulley 5, and the large diameter gear meshes with the winding gear 36 and the unwinding gear 37. A small diameter gear 4 that meshes with a constant speed drive gear 36A that transmits rotation to the winding gear 36 via a gear 42 and a clutch mechanism.
It is composed of 3. Reference numeral 44 denotes a switching plate slidably provided on the chassis 45, which is connected to the slide base 20 by a switching lever 46, and has a lower portion 47 that controls the rotation transmission operation of the intermediate transmission support gear 38. A high portion 48 is provided. The operation switching device of the present invention is configured as described above, and its operation will be explained next.

FIG. 1 shows a stopped state, and as is clear from the figure, the sliding plate 27 is held at the position shown because the attracting piece 34 is attracted by the magnet 35. Therefore, the rotating lever 17 connected to the sliding plate 27 is held in the illustrated position against the biasing force of the spring 16, and the pin 19 provided on the rotating lever 17 and the first control groove 14
The second gear 8 is locked in the position shown by contact with a locking portion 12 formed in the second gear 8.

In such a stopped state, the play button (not shown)
When pressed, a pulse voltage is applied to the coil of the magnet 35, and the attraction force of the magnet 35 is temporarily lost. As a result, the holding force on the rotating lever 17 via the sliding plate 27 is lost, so the rotating lever 17 is rotated counterclockwise by the biasing force of the spring 16, and the sliding plate 27 is moved in the direction indicated by the arrow B. direction to the non-adsorption position. The pin 19 on which the rotary lever 17 rotates in the counterclockwise direction disengages from the locking portion 12 of the first control groove 14 and frees the second gear 8, so that the slide base 20 is moved by the biasing force of the spring 24. It is caused to be slightly displaced in the direction of arrow A. As a result, the pin 23 provided on the slide base 20 moves within the second control groove 15, causing the second gear 8 to rotate counterclockwise. When the second gear 8 rotates counterclockwise, the teeth 9 of the second gear 8 mesh with the first gear 6, as shown in FIG. Further, when the sliding plate 27 is displaced to the non-adsorption position, the pin 50 is moved to the inclined side 3.
1 and 32 and engaged with the engagement recess 33, the rotary lever 40 is held at the neutral position as shown in FIG. As a result, the intermediate transmission gear 38
The large diameter gear 42 and the small diameter gear 43 that constitute the winding gear 36, the unwinding gear 37, and the constant speed drive gear 3
6A, the rotation of the motor 1 is not transmitted to the take-up reel shaft 53 and the rewind reel shaft 54. When the regeneration operation is performed and the attraction force of the magnet 35 disappears, the above-described operation is performed, and in conjunction with this operation, power is supplied to the motor 1, and the motor 1 is rotated clockwise. When the motor 1 rotates clockwise, the rotation is transmitted to the flywheel 4 via the belt 3, so the first gear 6 is rotated clockwise. As a result, the rotational driving force of the first gear 6 causes the second gear 8 to rotate counterclockwise. When the second gear 8 rotates counterclockwise,
The pin 23 moves within the second control groove 15 from the position shown in FIG. 11 to the position shown in FIG. 12. Since the second control groove 15 is eccentric, the slide base 20 is moved by the spring 24 as the pin 23 moves.
is displaced in the direction of arrow B, which is the operating position, against the urging force of . When the slide base 20 is moved to the operating position, the magnetic head comes into contact with the magnetic tape and the pinch roller 25 is pressed against the capstan 7. Further, with this operation, the pin 19 provided on the rotary lever 17 is caused to slide within the first control groove 14. And the second gear 8
When the pin 19 is rotated to the vicinity of FIG.
Rotate clockwise as shown in Figure 3.
When the rotary lever 17 rotates clockwise, the sliding plate 27 connected to the rotary lever 17 is displaced in the direction of arrow A, and the suction piece 34 comes into contact with the magnet 35. When the suction piece 34 comes into contact with the magnet 35, the suction force of the magnet 35 acts to hold the rotary lever 17 in the state shown in FIG. 3 against the biasing force of the spring 16. In this state, the second gear 8 is disengaged from the first gear 6 due to the toothless portion 10 of the second gear 8, and the second gear 8 is disengaged from the first gear 6.
The rotational driving force is cut off. And pin 1
9 is located at the locking portion 11 of the first control groove 14 as shown in FIG. Since it engages with the locking portion 11 of the control groove 14 and prevents the rotation of the second gear 8, the pin 23 provided on the slide base 20 is also prevented from sliding within the second control groove 15. . Therefore, the slide base 20 is held at the operating position where the playback operation is performed.
When the slide base 20 is displaced to the operating position in the direction of arrow B, the switching lever 46 rotates clockwise, so that the switching plate 44 is displaced in the direction of arrow A. Then, as shown in FIG. 9, the rotary lever plate 40, which had been located at the lower part 47 of the switching plate 44, comes into contact with the upper part 48 of the switching plate 44, and as a result, the intermediate transmission gear 38 is moved to the side opposite to the chassis 45. is displaced. Further, the pin 50 that was engaged with the engagement recess 33 of the sliding plate 27 is removed from the sliding plate 27.
7 becomes free by displacement in the direction of arrow A,
The rotational force of the intermediate gear 41 in the clockwise direction causes the rotary lever plate 40 on which the pin 50 is provided to be rotationally displaced in the clockwise direction. The rotating lever plate 4
0 is rotated clockwise, the small diameter gear 43 of the intermediate transmission gear 38 meshes with the constant speed drive gear 36A, as shown in FIG. Therefore, the rotational force of the motor 1 is transmitted to the take-up gear 36 via the pulley 2, the belt 3, the intermediate pulley 5, the intermediate gear 41, the intermediate transmission gear 38, and the constant speed drive gear 36A, and the rotational force is transmitted to the take-up reel shaft. 53 to perform a winding operation of the magnetic tape driven at a constant speed by the capstan 7 and the pinch roller 25. In this way, the switching operation from the stop state to the playback state and the operation of driving the magnetic tape in the playback state are performed.

The switching operation to the playback state is performed as described above, but next, the switching operation to the rewinding state depending on the playback state will be explained. When a rewind button (not shown) is pressed in the playback state shown in FIG. 3, a pulse voltage is applied to the coil of the magnet 35, and the attraction force of the magnet 35 is temporarily lost. As a result, the holding force on the rotating lever 17 via the sliding plate 27 is lost, so the rotating lever 17 is rotated counterclockwise by the biasing force of the spring 16 to the state shown in FIG. Become. When such an operation is performed, the pin 19 is disengaged from the locking portion 11 of the first control groove 14 as shown in FIG. 13, so that the restraining force on the second gear 8 is cut off. At this time, as the rotating lever 17 is rotated in the counterclockwise direction, the sliding plate 27 is displaced to the non-adsorption position in the direction of arrow B.
The pin 50 is attached along the inclined side 31 formed at 7.
moves, thereby rotationally displacing the rotary lever plate 40 in the counterclockwise direction. When the rotary lever plate 40 is rotated counterclockwise, the meshing state between the intermediate transmission gear 38 and the constant speed drive gear 36A is released. When the restraining force on the second gear 8 is cut off, the holding force that was holding the slide base 20 in the operating position disappears, so the slide base 20 is moved to the non-operating position by the biasing force of the spring 24 as shown by the arrow. It is displaced in the A direction. In this state, since the toothless portion 10 of the second gear 8 faces the first gear 6, the meshing operation between the tooth portion 9 of the second gear 8 and the first gear 6 is not performed. Then, arrow A due to the biasing force of the spring 24 of the slide base 20
As the pin 23 moves in the second control groove 15 to the position shown in FIG. 13, the second gear 8 is rotated approximately half a turn counterclockwise as shown in FIG. 14. become a state. When the second gear 8 is rotated, the pin 19 causes the rotation lever 17 to rotate clockwise as shown in FIG.
When the rotary lever 17 rotates clockwise, the sliding plate 27 connected to the rotary lever 17 is displaced in the direction of arrow A, and the suction piece 34 comes into contact with the magnet 35. The attracting force of the magnet 35 in which the attracting piece 34 comes into contact with the magnet 35 acts to hold the rotary lever 17 in the state shown in FIG. 5 against the biasing force of the spring 16. When such an operation is performed, the pin 19 of the rotating lever 17 engages with the locking portion 12 of the first control groove 14 again. As a result, the rotational movement of the second gear 8 is inhibited, so the slide base 20 is held in the non-operating position. The slide base 20
When the pinch roller 25 is displaced and held in the non-operating position, the pinch roller 25 is separated from the capstan 7, and the switching lever 46 moves the switching plate 44 in the direction of arrow B. When the switching plate 44 is displaced in the direction of arrow B, the rotating lever 40 comes into contact with the lower part 47 of the switching plate 44, as shown in FIG.
As a result, the intermediate transmission gear 38 is displaced in the direction of the chassis 45. In this state, the motor 1 is rotated counterclockwise in the opposite direction. Then, the pin 50 that was engaged with the engagement recess 33 of the sliding plate 27 becomes free due to the displacement of the sliding plate 27 in the direction of arrow A, so that the intermediate gear 41 moves counterclockwise. Due to the rotational force, the rotary lever plate 40 on which the pin 50 is provided is rotated counterclockwise. When the rotary lever 40 is rotated counterclockwise, the large diameter gear 42 of the intermediate transmission gear 38 meshes with the rewinding gear 37, as shown in FIG. Therefore, the rotational force of the motor 1 is generated by the pulley 2, belt 3,
Intermediate pulley 5, intermediate gear 41, and intermediate transmission gear 3
8 to the rewinding gear 37 to rotate the rewinding reel shaft 54 to rewind the magnetic tape. In this way, the switching operation from the playback state to the rewinding state and the driving operation of the magnetic tape in the rewinding state are performed.

As described above, the operation when changing from the playback state to the rewinding state is performed, but the operation when changing from the playback state to the fast forwarding state is also performed in substantially the same way. The difference is that the slide base 20 has a spring 24.
After the motor 1 is returned to the non-operating position at , the motor 1 is rotated counterclockwise during the rewind operation, but is rotated clockwise during the fast forward operation. When the motor 1 is rotated clockwise, the intermediate gear 41 rotates clockwise, and the rotary lever plate 40 is rotationally displaced clockwise. When the rotary lever plate 40 is rotated clockwise, the large diameter gear 42 of the intermediate transmission gear 38 is moved to the take-up gear 36 as shown in FIG.
A drive operation for rapid forwarding of the magnetic tape is performed by the meshing take-up reel shaft 53.
When the playback button is pressed in order to return to the playback state from the fast-forward state described above, the attraction force of the magnet 35 temporarily disappears as described above. When the attraction force of the magnet 35 disappears, the rotating lever 1
7 is rotated counterclockwise to disengage the pin 19 from the locking portion 12 of the first control groove 14. When such an operation is performed, the second gear 8 is slightly rotated by the biasing force of the spring 24 of the slide base 20 and meshes with the first gear 6, so that the above-mentioned operation is performed thereafter to return to the regeneration state. A switch will take place.

(g) Effects of the Invention The operation switching device of the present invention applies the rotational force of the motor to the engagement recess formed in the sliding plate in the non-adsorption position when the operation is switched by the rotational force of the motor. A transmission gear for selectively transmitting information to the take-up reel shaft or the unwind reel shaft is engaged with a pin provided on a rotary lever plate rotatably attached to the take-up reel shaft or the unwind reel shaft. Since the rotational force of the motor is not transmitted to the reel shaft, when the switching operation is performed by the rotational force of the motor, the magnetic tape is run by the rotation of the take-up reel shaft or the rewinding reel shaft. This can be prevented.

[Brief explanation of drawings]

The drawings all relate to the operation switching device of the present invention, and FIGS. 1 to 5 are overall plan views, with FIG. 1 in a stopped state, FIG. 2 in a starting state, FIG. 3 in a reproducing state, and FIG. Figure 4 shows a state in the middle of changing from a playback state to a rewinding state, and Figure 5 shows a rewinding state. Figures 6 to 8 are cross-sectional views of main parts. 7 shows the fast forwarding state, FIG. 8 shows the rewinding state, FIGS. 9 and 10 are side sectional views showing the playback state and the rewinding state, and FIGS. 11 to 15 show the first gear and the second gear. 11 is a plan view of the gear part, FIG. 11 is the operation start state, FIG. 12 is the playback state, FIGS. 13 and 14 are the states in the middle of transition from the playback state to the rewinding state, and FIG. 15 is the rewinding state. are shown respectively. Explanation of main drawing numbers, 1... Motor, 6... First gear, 8... Second gear, 14... First control groove, 15
...Second control groove, 17... Rotating lever, 20...
Slide base, 27...Sliding plate, 35...Magnet, 38...Intermediate transmission gear, 40...Rotary lever plate, 41...Intermediate gear.

Claims (1)

[Claims] 1 A first gear rotationally driven by a motor, and a second gear that selectively meshes with the first gear and displaces the slide base between an operating position and a non-operating position.
a gear, a rotation lever provided with a locking member that locks the second gear to hold the slide base in the operating position and the non-operating position, and an engagement recess having sloped sides on the left and right sides. a sliding plate formed thereon and slidably displaced between an adsorption position and a non-adsorption position by rotational displacement of the rotary lever, and on which an adsorption piece is formed; a magnet that holds the sliding plate in the suction position against the biasing force of a spring by suctioning the suction piece that is attached to the magnet; a rotary lever plate provided with a pin that engages in the engagement recess; and a rotating lever plate rotatably attached to the rotary lever plate and selectively applying the rotational force of the motor to a take-up reel shaft or a rewind reel shaft. A tape recorder operation switching device consisting of a transmission gear that transmits information to the user.