JPH0370867B2 - - 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.

(c) Problems to be Solved by the Invention In a tape recorder configured to displace a slide base from a non-operating position to an operating position and from an operating position to a non-operating position by the rotational force of a motor, it is difficult to change the position of the slide base. Since a mechanism for detecting and locking the slide base in the operating position is required, the structure becomes complicated. 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 includes a first gear rotatably driven by a motor, first and second control grooves, and a toothless portion. a second gear that selectively meshes with the first gear; and a first gear of the second gear.
a rotating lever that is rotatably displaced by a pin that fits in the control groove; a slide base on which a magnetic head is placed and a pin that fits in the second control groove; A sliding plate that is caused to slide by the rotational displacement of the lever and has a suction piece formed thereon, and the suction piece formed on the sliding plate is suctioned to cause the rotating lever to be biased by the spring force. It consists of a magnet that resists and holds it in a controlled position.

(E) Effect The present invention provides first and second control grooves in the second gear that selectively meshes with the first gear to which the rotational force of the motor is transmitted, and the function of the pin that fits in the grooves. Therefore, the slide base is displaced and the rotary lever, which is displaced by the action of the pin, is held in the displaced position by the attraction force of the magnet, thereby locking and holding the slide base in the operating position. This is what I did.

(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 indicates a first gear attached to the capstan 7, which is the central axis of rotation of the flywheel 4, and reference numeral 8 indicates a first gear having toothed portions 9 and toothless portions 10 formed around it, and is selected as the first gear 6. It is a second gear that is meshed with each other, and has a locking part 1 on the back side as shown in FIGS. 11 to 15.
1, 12 and a first control groove 14 having a cam surface 13.
is formed, and an eccentric second control groove 15 is formed on the surface. Reference numeral 17 denotes a rotary lever that is supported by a shaft 18 and urged to rotate counterclockwise by a spring 16, and has a pin 19 fitted in the first control groove 14 at one end. It is provided. 20 is a long hole 22 in the pin 21 on the chassis.
It is a slide base that is slidably attached by fitting into the slide base and is provided with a magnetic head (not shown) and a pin 23 that fits into the second control groove 15. It is biased in the direction of arrow A, which is the non-operating position. Further, a pinch roller fitting 26 is attached to the slide base 20 to rotatably support a pinch roller 25 for driving the magnetic tape at a constant speed.
A sliding plate 27 is slidably attached by fitting a long hole 29 into a pin 28 on the chassis, and is connected to the rotary lever 17 by a pin 30 and tilts symmetrically. An engaging recess 33 and an adsorption piece 34 having inclined sides 31 and 32
is formed. Reference numeral 35 denotes a magnet disposed opposite the adsorption piece 34, and when the sliding plate 27 slides in the direction of arrow A and comes into contact with the adsorption piece 34, it attracts and maintains that state. However, when a pulse voltage for generating magnetic flux in the opposite direction is supplied to a coil (not shown) around which the magnet is wound, the attraction force is temporarily lost. 36 and 37 are winding gears and unwinding gears provided on the winding rail shaft 53 and unwinding reel shaft 54, and 38 is an intermediate transmission gear, which is connected to the shaft 39 of the intermediate pulley 5 as shown in FIG. The intermediate gear 41, the winding gear 36, and the winding gear 41 are rotatably mounted on a rotary lever plate 40 that is mounted so as to be displaceable vertically and horizontally, and are also provided to rotate integrally with the intermediate pulley 5. It is comprised of a large diameter gear 42 that meshes with the return gear 37 and a small diameter gear 43 that meshes with a constant speed drive gear 36A that transmits rotation to the winding gear 36 via a clutch mechanism. 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 and a higher portion that control the rotation transmission operation of the intermediate transmission gear 38. A section 48 is provided. The operation switching device of the present invention is configured as described above, and its operation will be explained next.

In FIG. 1, the slide plate 27 is in a stopped state, and since the attraction piece 34 is attracted to the sliding plate 27 by the magnet 35, it is held at the position shown. Therefore, the rotating lever 17 connected to the sliding plate 27
is held in a control position that prevents the second gear 8 from meshing with the first gear 6, and is a locking portion formed in the pin 19 provided on the rotary lever 17 and the first control groove 14. 12, the second gear 8 is locked in the position shown.

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 that the rotating lever 17 is rotated counterclockwise by the biasing force of the spring 16. When the rotary lever 17 is rotated counterclockwise, the pin 19 is disengaged from the locking portion 12 of the first control groove 14 and the second gear 8 is freed, so that the slide base 20 is moved by the biasing force of the spring 24. By arrow A
direction. As a result, the pin 23 provided on the slide base 20
As it moves within the control groove 15, the second gear 8 is rotated 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. Rotate in the direction. 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 pin 23
As the slide base 20 moves, the slide base 20 is displaced in the direction of arrow B, which is the operating position, against the biasing force of the spring 24. 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. Then, when the second gear 8 is rotated to the vicinity of FIG. 12 mentioned above,
The pin 19 is guided by the cam surface 13 to cause the pivot lever 17 to pivot clockwise as shown in FIG. When the rotary lever 17 rotates clockwise, the sliding plate 2 connected to the rotary lever 17
7 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 move the rotating lever 17 towards the spring 1.
It is held in the state shown in FIG. 3 against the urging force of 6. In this state, the second gear 8 is disengaged from the first gear 6 by the action of the toothless portion 10, and the rotational driving force for the second gear 8 is cut off. The pin 19 is connected to the first control groove 1 as shown in FIG.
4, the slide base 20 is moved in the direction of arrow A by the return force of the spring 24.
Even if the pin 19 attempts to return to the direction, the pin 19 engages with the locking portion 11 of the first control groove 14 and prevents the second gear 8 from rotating, so the pin 23 provided on the slide base 20 also returns to the second control direction. Sliding within the groove 15 will be prevented. Therefore, the slide base 20 is held at the operating position where the playback operation is performed. When the slide base 20 changes 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 from the chassis 45.
and is displaced to the opposite side. Further, the pin 50 that was engaged with the engagement recess 33 of the sliding plate 27 is
Since the sliding plate 27 is freed by displacement in the direction of arrow A, the rotating lever plate 4 on which the pin 50 is provided is moved by the clockwise rotational force of the intermediate gear 41.
0 is rotationally displaced clockwise. When the rotary lever plate 40 is rotated clockwise, the sixth
As shown in the figure, the small diameter gear 43 of the intermediate transmission gear 38
meshes with the constant speed drive gear 36A. 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 from the playback state to the rewinding state will be explained. When the 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.
The attraction force of the magnet 35 is temporarily lost.
As a result, the rotating lever 1 via the sliding plate 27
7 is no longer held, the pivoting lever 17 is pivoted counterclockwise by the biasing force of the spring 16, resulting in the state shown in FIG. 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, since the sliding plate 27 is displaced in the direction of arrow B as the rotating lever 17 is rotated in the counterclockwise direction, the pins are moved along the inclined side 31 formed on the sliding plate 27. 50 moves to rotate and displace 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 held the slide base 20 in the operating position disappears.
The slide base 20 is displaced in the direction of arrow A, which is the non-operating position, by the biasing force of the spring 24. 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, while the pin 23 moves in the second control groove 15 to the position shown in FIG. Rotate about half a turn counterclockwise to reach the state shown in FIG. 14. When the second gear 8 is rotated, the pin 1
9 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.
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. 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. When the slide base 20 is displaced and held in the non-operating position, the pinch roller 25 is separated from the capstan 7 and the switching lever 46 is moved.
The switching plate 44 is displaced in the direction of arrow B by the action of . When the switching plate 44 is displaced in the direction of arrow B, the rotating lever plate 40 comes into contact with the lower part 47 of the switching plate 44, as shown in FIG. 10, and 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. The rotational force causes the rotational lever plate 40 on which the pin 50 is provided to be rotationally displaced in the counterclockwise direction. When the rotary lever plate 40 is rotated counterclockwise, the eighth
As shown in the figure, the large diameter gear 42 of the intermediate transmission gear 38
meshes with the rewinding gear 37. Therefore, the rotational force of the motor 1 is applied to the pulley 2, belt 3, intermediate pulley 5,
The signal is transmitted to the rewinding gear 37 via the intermediate gear 41 and the intermediate transmission gear 38 to rotate the rewinding reel shaft 54 to perform a rewinding operation of 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 is rotated 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 to return to the playback state from the fast-forward state described above, the attraction force of the magnet 35 is temporarily lost as described above. When the attraction force of the magnet 35 disappears, the rotary lever 17 is rotated counterclockwise, and the pin 19 is released 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 occur.

(G) Effects of the Invention The present invention provides first and second control grooves in a second gear that selectively meshes with the first gear to which the rotational force of the motor is transmitted, and a pin that fits in the grooves. The slide base is displaced by the action of the pin, and the rotating lever, which is displaced by the action of the pin, is held in the displaced position by the attraction force of the magnet, thereby locking the slide base in the operating position. This has the advantage that a special mechanism for locking the slide base is not required and the construction is extremely simple.

[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.

Claims (1)

[Claims] 1 a first gear rotatably driven by a motor;
and a second gear having a second control groove formed therein and selectively meshing with the first gear by the action of a toothless portion, and a pin fitting into the first control groove of the second gear to rotate the second gear. A rotary lever that is displaced; a slide base on which a magnetic head is placed and a pin that fits into the second control groove; and a slide base that is slidably displaced by the rotational displacement of the rotary lever. a sliding plate on which a suction piece is formed, and a magnet that holds the rotary lever at a control position against the biasing force of a spring by suctioning the suction piece formed on the sliding plate. Become,
The second gear is rotationally driven by the rotational force from the motor transmitted through the first gear, thereby displacing the slide base to the operating position via the pin that fits in the second control groove, and also displacing the slide base to the operating position. The suction piece is attracted to the magnet by moving the rotary lever and the sliding plate using a pin that fits in the second control groove, and the second
The second gear is unlocked by locking the gear, holding the slide base in the operating position against the return force of the spring, and temporarily dissipating the attraction force of the magnet, thereby moving the rotary lever and releasing the lock of the second gear. ,
The slide base is returned to the non-operating position by the return force of the spring, and the second gear is rotated to move the rotary lever and the sliding plate, and the second gear is again locked by the attraction action of the magnet against the attraction piece. An operation switching device for a tape recorder, characterized in that a slide base is held in a non-operating position.