JPS6120665Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an automatic stop device for a magnetic recording/playback machine.

[Background of the idea]

Conventional tape recorders have the disadvantage that if the power is turned off during playback, the pinch roller remains crimped to the capstan, damaging the pinch roller and the tape and reducing the performance of the tape recorder. Ta.

Also, in conventional tape recorders, when the power is turned off, a large capacitor and its circuit are used to instantly send a large current to the plunger winding.
There are some that stop by absorbing the movable shaft, but in this case, it is difficult to downsize the device, and it also has the disadvantage of making the device expensive. Furthermore, in some car stereos, the cassette automatically ejects every time the power is turned off. In this case, if you leave the cassette unejected, the tape inside the cassette may become loose due to vibrations caused by driving the car. sagging,
If you attach the tape and play it, you will damage the tape. Furthermore, if the ejected cassette is to be stored separately, it will also be necessary to move it to another storage location within the vehicle, and it is unsafe for a driving driver to do this every time the cassette is ejected.

[Purpose of invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic stop device for a magnetic recording/playback machine that eliminates the above-mentioned drawbacks of the prior art and prevents damage to the tape.

[Summary of the idea]

In this invention, when the power is cut off to the locking means that maintains the operating state, the energization of the electromagnetic magnet is stopped and the actuator is returned to its original state, and the locking means that maintains the recording and reproducing operating state of the tape recorder is activated. This is due to the fact that the configuration was configured to release the .

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

In the figure, reference numeral 18 is a board having a tape recorder cassette tape mounting device and tape drive system. 1, 2, and 3 are operating rods for playback, fast forwarding, rewinding, etc., each having a curved protrusion A, and the base plate 18
It is attached to the top so that it can slide back and forth, and is always biased backward by a spring (not shown). Numeral 4 is a stop operation lever, which is slidably mounted on the base plate 18 in the same way as the operation levers 1, 2, and 3, and is always biased rearward by a spring (not shown). Reference numeral 5 denotes a locking plate, which is attached to the base plate 18 so as to be slidable in the left-right direction, and the curved protrusion A engages with the slope B on which the curved protrusion A of the operating rods 1, 2, and 3 comes into contact. It has a concave portion D that is stopped, and a sloped end portion C that the curved protrusion A of the operating rod 4 comes into contact with. 14 is a first spring that always biases the lock plate 5 in the right direction;
Numeral 6 denotes a sliding plate, which is attached to the base plate 18 in the left-right sliding direction in the same way as the locking plate 5, and is attached to the operating rods 1, 2,
The curved protrusion A of No. 3 has a sloped end J that abuts, and
It is always urged to the right by a spring 15. Reference numeral 8 denotes a release plate, which is rotatably provided on the base plate 18 by a shaft 9, and is always biased clockwise (in the direction of arrow G) by a third spring 16. Furthermore, the protrusion 5 of the locking plate 5 is provided at one end 8b of the release plate 8.
a and the projection 6a of the sliding plate 6 both correspond to the same direction. The protrusion 6a prevents the release plate 8 from moving in the clockwise direction (G direction). Reference numeral 10 denotes a holding member which is rotatably provided on the substrate 18 by a shaft 11, and is always biased counterclockwise by a fourth spring 17. Reference numeral 12 denotes a stopper provided on the substrate 18 for stopping the biasing of the holding member 10 in a fixed position. An electromagnetic magnet 13 is capable of attracting and holding the actuator 10 against the tension of the fourth spring 17. Further, the actuator 10 has a protrusion 1 to which the other end 8a of the release plate 8 is locked.
0a, and when the magnet 13 is not energized, the locking is disabled, and the locking can be held only when the magnet 13 is energized.

The operation of this device will be explained below. Figure 1 shows the stopped state before the power is turned on, and even if the operating rods are operated in this state, they will not be locked in the operating position. For example, when the regenerative operating rod 1 is pressed, the protrusion A comes into contact with the inclined end B of the chain plate 5 and the inclined end J of the sliding plate 6, and is moved leftward against the first and second springs 14, 15 that bias them,
The release plate also rotates clockwise (G direction). At this time, the recess D of the locking plate 5 tries to return to its original position to lock the protrusion A of the operating rod 1, but since the force of the third spring 16 is set stronger than that of the first spring 14, the release plate 8 stops the locking plate 5.
The operating lever 1 also remains moved to the left.
The protrusion A of the lever 1 is not locked and is returned by a return spring (not shown). Therefore, when the power source 21 is not turned on by the power switch 20, the operating rod 1 is not locked in the operating position.
When the power switch 20 is turned on, the electromagnetic magnet 13 is energized, and the actuator 10b
Therefore, as shown in FIG. 2, the other end 8a of the release plate 8 is rotated until the protruding portion 10a of the actuator 10 can prevent the other end 8a from moving in the G direction. When the operating rod 1 is pressed in this state, the lock plate 5 and the sliding plate 6 move in the left direction (arrow H).
When the release plate 8 is moved in the direction G (toward the left) and is further pressed, the protrusion A of the operating rod 1 is locked by the recess D of the locking plate 5 as shown in FIG. 3. At this time, the movement of the release plate 8 in the direction G by the third spring 16 is blocked by the protrusion 10a of the actuator 10 as described above, so the locking plate 5 returns to its original position and locks the protrusion A of the operating rod 1 in the operating position. The sliding plate 6 remains moved in the opposite direction to the direction of arrow F (to the left) and is locked in a folded state with a gap between the protrusion 6a and one end 8b of the release plate 8. The same is true for the other operating rods 2 and 3. To stop from this playback (fast forward/rewind) state, in the case of manual operation, pressing the operating rod 4 will cause the protrusion A to move to the locking plate 5.
The automatic stop can be achieved by electrically detecting the end of the tape and temporarily cutting off the power to the electromagnetic magnet 13 by the action of the tape end detection circuit 19.
0 is rotated counterclockwise by the tension of spring 17, and protrusion 10a releases the blocking of portion 8a of release plate 8, so that release plate 8 rotates in the direction G. Accordingly, one end 8b of release plate 8 presses protrusion 5a of locking plate 5 in the direction H, so that the lock is released and the lock is automatically stopped. Figure 4 shows the automatically stopped state. From the state shown in Figure 4, second spring 15 biasing sliding plate 6 is set stronger than third spring 16 biasing release plate 8 in the direction G, so that release plate 8 is moved in the direction F by sliding plate 6 and stops.

6 and 7 show the related operation in which the head board 23 carrying the pinch roller 25, magnetic head 29, etc. is advanced to the reproducible position by the operation of the reproducing operation lever 1. Figure 6 shows the stopped state.
When the playback operation lever 1 is now moved to the playback position, the bent end 1a of the playback operation lever presses against the end 23b of the head board 23. Therefore, the head board 23 is
Since it is rotatably provided on a shaft 24 set up on the base plate 18, it is rotated counterclockwise against the head base plate spring 30 and maintained in the regenerated state. At this time, the pinch roller 25 is pressed by a spring 28 to a capstan 22 rotatably provided on the substrate (FIG. 7).

[Effect of idea]

As mentioned above, according to the present invention, the recording and playback (fast forward/rewind) state can be locked only when the magnet is energized, so when the power is cut off, it automatically returns to the stopped state. Ru. Therefore, the disadvantages of the prior art can be avoided, and since the cassette tape is not automatically ejected, the tape can be continued to be played immediately before the tape is stopped. Therefore, it is very convenient for car stereos, etc.

[Brief explanation of the drawing]

Fig. 1 is a stop state diagram when the magnet is not energized in one embodiment of the automatic stop device for a magnetic recording/playback device according to the present invention, and Fig. 2 is a diagram showing the state in which the magnet is energized in the embodiment shown in Fig. 1. FIG. 3 is a state diagram of the regeneration operation in the embodiment shown in FIG. 1. FIG. 4 is a state diagram of automatic stop when the magnet is de-energized from the state of FIG. 3.
Figure 5 is a schematic circuit diagram of the electromagnetic drive circuit of the automatic stop device for the magnetic recording/reproducing machine of the present invention, and Figures 6 and 7 are for explanation of the playback operation rod, pinch roller, and head shown in Figure 1. FIG. 1... Operation lever for playback, 2... Operation lever for fast forwarding,
3... Operating rod for rewinding, 4... Operating rod for stopping, 5
...Lock plate, 6...Sliding plate, 8...Release plate, 10
... Actuator, 13 ... Electromagnetic magnet, 14 ...
First spring, 15...Second spring, 16
...Third spring, 17...Fourth spring.

Claims (1)

[Scope of utility model registration request] In a magnetic recording and reproducing machine that has a tape end detection means and can switch between auto-stop and tape running at the tape end, the pinch roller is moved to the capstan by engaging a member that rotatably supports the pinch roller and moving the member. A regeneration means to be crimped to the regeneration means, a locking means for holding the regeneration means in a regeneration operation state, an electromagnetic magnet connected to a power source via a switch or the like, and an actuator held when the electromagnetic magnet is energized. so that when the power source is cut off and no current flows through the winding of the electromagnetic magnet, the actuator of the electromagnetic magnet is activated to self-return to release the locking means, and the pinch roller and capstan are separated. An automatic stop device for a magnetic recording/playback device, characterized in that it is configured to stop the magnetic recording/playback device.