JPH05266539A - Self-supporting type solenoid control device - Google Patents

Abstract

PURPOSE:To exactly set fast forward mode or rewind mode by a least two or more times applying an attracting force releasing voltage near the prescribed timing which releases the attracting force of a self-supporting type solenoid. CONSTITUTION:When a pin P is located near P3, that is, near the prescribed timing where the attracting force is to be released, a voltage is applied for few times to make the attracting force to be zero. By this, an attracting force is generated in a trigger magnet, the pin P does not move from P3 to P5 when the attracting force is released and it moves along a cam surface 11 in the successive order of P4 P6 P7 by the pressing force of a spring. Due to a projecting section T3, an attracting force acts on the trigger magnet after that, the pin P leaves the cam surface 11 and moves to the position of P7. By the motion of the pin P above, a tape does not contact a magnetic head and a pinch roller, the tape moves at a high speed and a fast forward or a rewind mode are surely set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-holding solenoid control device, and more particularly to a self-holding solenoid control device suitable for controlling the timing of operation mode switching of a tape recorder or the like.

[0002]

2. Description of the Related Art Usually, a tape recorder which uses a self-holding solenoid called a trigger magnet to switch the operation mode to, for example, recording, reproducing or fast-forwarding has been known, and an example thereof is Japanese Patent Laid-Open Publication No. Sho. 58-2
No. 15719. In this publication, a trigger voltage is applied to a trigger magnet to release the attraction force,
It is disclosed to control the movement of the associated lever to switch between operating modes.

Here, the trigger magnet is a coil in which a permanent magnet is wound, and when the coil is energized by applying a trigger voltage, the magnetic flux generated in the coil cancels the magnetic flux of the permanent magnet. While the coil is energized, the attraction force of the permanent magnet disappears.

FIG. 4 is a characteristic diagram showing the relationship between the trigger voltage (V) applied to such a trigger magnet and the attraction force (g) of the trigger magnet generated in response to this trigger voltage. As is clear from the figure, the applied voltage is x
At the point (here, 0.95 V), the attraction force of the trigger magnet becomes zero. That is, it is understood that the magnetic flux due to the permanent magnet of the trigger magnet is completely canceled when the trigger voltage is the point x. Then, the attraction force increases toward the y point (voltage 0 V) or the z point (voltage 2 V) centering on the x point. This is because the trigger voltage smaller than the point x is not sufficient to cancel the magnetic flux of the permanent magnet, and the trigger voltage larger than the point x exceeds the voltage required to cancel the magnetic flux of the permanent magnet. Also in the case of, the attraction force is generated according to the deviation from the point x.

By the way, when the operation mode is switched by using the trigger magnet, in order to downsize the apparatus, the trigger magnet is excited only once to set the recording or reproduction mode, or the trigger magnet is excited once. Then, it is considered that after the attraction force is released, it is further excited to release the attraction force and, for example, a fast-forward or rewind mode different from the above mode is set.

In this case, for example, a voltage having a waveform as shown in FIG. 5 can be applied to the trigger magnet to control the movement of the lever to set a desired operation mode.
That is, when setting the recording or reproducing mode, only the trigger voltage a is applied, and when setting the fast-forwarding or rewinding mode, first the trigger voltage a is applied and then the trigger voltage b is applied.

[0007]

However, the magnitude of the trigger voltage b is the voltage at the point x in FIG. 4, that is, 0.
In the case of 95 V, the attraction force does not work during the period when the trigger voltage b of FIG. 5 is at “H” level, but when the magnitude of the trigger voltage b unintentionally becomes 2 V, the level of 0.95 V is set. The signal passes through only once at the rising edge of the signal, and the attraction force is generated during the "H" level period. Therefore, in this case, if the rising timing of the signal and the desired timing at which the attraction force of the trigger magnet should be released for the second time are slightly different, the desired mode such as fast-forward or rewind cannot be set accurately. There was a problem.

The self-holding solenoid control device of the present invention has been made by paying attention to such problems, and its purpose is to excite the self-holding solenoid.
An object of the present invention is to provide a self-holding solenoid control device capable of accurately setting an operation mode of a tape recorder or the like.

[0009]

In order to achieve the above object, the self-holding solenoid control device of the present invention, at least twice or more, near a desired timing for releasing the attraction force of the self-holding solenoid, By applying the attraction force release voltage, the attraction force release operation of the self-holding solenoid is performed.

[0010]

That is, in the self-holding solenoid control device of the present invention, the attraction force releasing voltage is applied at least twice or more near the desired timing for releasing the attraction force.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the self-holding solenoid controller of the present invention is applied to a tape recorder will be described in detail below with reference to the drawings.

FIG. 2 shows the structure of a self-holding solenoid, which is usually called a trigger magnet, which is excited when an operator pushes an operation button (not shown) of the tape recorder to set a desired operation mode.

The fixed portion of the trigger magnet includes a permanent magnet 1 and a pair of iron cores 2 and 2'fixed to both sides of the permanent magnet 1. The permanent magnet 1 and the iron cores 2 and 2'are U-shaped. Is formed. As shown in the figure, coils 3 are attached to the iron cores 2 and 2 '
Is wound. Fixing pieces 4, 4'are provided at the ends of the respective iron cores 2, 2 '. Further, 5 and 5'are bases. Further, a trigger voltage generator 20 is connected to the terminals 6 and 6'for applying a trigger voltage as shown in FIGS. 1 (a) and 1 (b) to the coil 3.

The movable piece 7 of the trigger magnet and the lever 8 having a pin P described later are connected by inserting a shaft 8a fixed to the lever 8 into a hole 7a provided in the movable piece 7. There is. Further, a spring 9 is fixed to bias the lever 8 upward in the drawing.

In the above structure, when the trigger voltage is not applied from the trigger voltage generator 20 to the trigger magnet, that is, the terminals 6 and 6 ', that is, when the coil 3 is not energized, the movable piece is moved. 7 is in contact with the fixed pieces 4, 4'by the magnetic force of the permanent magnet 1. On the other hand, when a current is flowing through the coil 3, a magnetic flux that cancels the magnetic force of the permanent magnet 1 is generated, so that the attraction force is released and the urging force of the spring 9 causes the movable piece 7 to move to the fixed piece 4.
Leave 4 '. FIG. 3 is a diagram showing the structure of the gear unit 10 that rotates in the direction of the arrow in accordance with the setting of the operation mode.

As shown in the drawing, the gear portion 10 is composed of three areas A, B and C integrally formed. Of these areas, the areas A and C are on the same plane and the area B is A. And a concave portion is formed on the C region surface. That is, the region B constitutes a cam portion whose shape is defined by the cam surfaces 11 and 12. Then, with the rotation of the gear portion 10, a plane perpendicular to the paper surface of the pin P movable in a predetermined direction (here, substantially radial direction) regulated by the cam surface is a predetermined position of the cam portion (in FIG. 3). (P1 position). The pin P is provided integrally with the lever 8 in FIG. 2, and the spring 9 is fixed to the lever 8 as described above.
As a result, the pin P is biased by the spring 9 so as to move toward the cam surface 11 when the attraction force of the trigger magnet is released. Here, P1 to P7 in the figure show respective positions of the pin P when the cam portion is fixed in the relative positional relationship between the cam portion and the pin which changes with the rotation of the gear portion. The following describes how the pin P moves when the operator presses a specific operation button among the operation buttons (not shown) to set a desired operation mode.
When the stop mode is set, the pin P is at the position P1.

Here, when a recording or reproducing button (not shown) is pressed, a trigger voltage (d in FIG. 1A) is applied from the trigger voltage generator 20 to the trigger magnet. As a result, the attraction force of the trigger magnet is released, so that the movable piece 7 in FIG. 2 is separated from the fixed pieces 4 and 4 ′ by the biasing force of the spring 9. Therefore, in FIG. 3, the pin P moves from the position P1 to contact the slope 11a, and the biasing force of the spring 9 causes the gear portion 10 to rotate in the direction of the arrow P2.
Move to position.

After that, when the pin P is in the position P1, the drive gear (not shown) in the gear missing portion 10a meshes with the teeth of the gear portion 10 when the pin P comes to the position P2, and as a result, The gear portion 10 is rotated in the direction of the arrow by the action of the CPU and the motor (not shown), and the pin P is automatically moved to the position of P3. At this position, the movable piece 7 of the trigger magnet comes into contact with the fixed pieces 4, 4 ', and the magnetic force of the permanent magnet 1 of the trigger magnet becomes larger than the urging force of the spring 9 to generate an attractive force. Therefore, the pin P then moves along the cam surface 12 (but does not contact the cam surface 12) from P5 to P7. The lever 8 is also moved by the above movement of the pin P, and the magnetic head (not shown) is brought into contact with the tape (not shown) accordingly, and the setting of the recording or reproducing mode is completed. Next, a case where the stop mode is set to the fast-forward or rewind mode will be described.

Also in this case, as in the recording or reproducing mode,
Since the trigger voltage (e in FIG. 1B) is applied to the trigger magnet from the trigger voltage generation circuit 20, the attraction force is released and the pin P moves from the position P1 to P2.
Then, the gear portion 10 is moved to the position of P3 by the rotation of the gear portion 10. In setting the operation mode, it is necessary to move the pin P from P3 along the cam surface 11 as P4 → P6 → P7. .. Therefore, after the pin P has exceeded P3 (immediately in some cases), a trigger voltage is again applied to the trigger magnet to bring the pin P into contact with the cam surface 11 P4.
Need to be moved to. However, as described above, when the trigger voltage as shown in FIG. 5B is applied, the voltage (0.95V in this case) at which the attraction force is released is only once at the rising edge of the signal, so the application timing is When it comes to the front of the protrusion T1 (between P2 and the protrusion T1), the pin P does not move to P4 and the protrusion T1 again generates an attraction force on the trigger magnet, and thereafter the attraction force is released. Since there is no opportunity, there may occur a case of moving from P3 to P5. Therefore, in this case, the fast-forwarding or rewinding mode is not set even though it is attempted to be set.

Therefore, in one embodiment of the present invention, when the pin P is in the vicinity of P3, that is, in the vicinity of the desired timing for releasing the attraction force, the trigger voltage as shown by f and g in FIG. , The voltage (0.
95 V) is applied several times (at least twice or more). That is, each time the trigger voltage is applied, the trigger voltage always changes between the points y and z in FIG. 4 through the point x. As a result, even if an attractive force is generated on the trigger magnet between f and g, the voltage (0.95 V) at which the attractive force becomes 0 is applied to the trigger magnet several times (at least 2 times).
Since the pin P does not move from P3 to P5 when the suction force is released thereafter, the cam surface 11 is moved in order of P4 → P6 → P7 by the urging force of the spring.
Move along. To be precise, since there is the protrusion T3, the attraction force acts on the trigger magnet after that, and the pin P moves away from the cam surface 11 to the position P7. More pins P
The movement of the lever 8 also moves the lever 8 and the tape (not shown) is not brought into contact with the magnetic head (not shown) or the pinch roller (not shown), and the tape can run at high speed. In this way, the fast forward or rewind mode is set reliably.

When a trigger voltage is applied to the trigger magnet of the pin P at the position P7 and the gear portion 10 further rotates in the same direction by a predetermined amount, the protrusion P extends along the cam surface 11 up to the protrusion T3. After that, since the attraction force acts on the trigger magnet, the trigger magnet is separated from the cam surface 11 and finally returns to the position P1.

As described above, in this embodiment, 2
Since the voltage (0.95 V) for releasing the attraction force is applied to the trigger magnet several times (at least twice or more) when the attraction force is released for the second time, the fast-forward or rewind mode can be set accurately.

[0023]

As described above in detail, in the self-holding solenoid control device of the present invention, for example, the operation of a predetermined related member can be surely performed in association with the releasing operation of the suction force of the self-holding solenoid. ..

[Brief description of drawings]

FIG. 1 is a waveform diagram of a trigger voltage applied to a trigger magnet in an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a trigger magnet.

FIG. 3 is a diagram showing a structure of a gear portion and a cam portion.

FIG. 4 is a characteristic diagram showing a relationship between an attraction force of a trigger magnet and a trigger voltage.

FIG. 5 is a waveform diagram of a trigger voltage applied to a trigger magnet in the conventional configuration.

[Explanation of symbols]

1 ... Permanent magnet, 2 and 2 '... Iron core, 3 ... Coil, 4 and 4'
... Fixing pieces, 5 and 5 '... base, 6,6' ... terminals, 7 ... movable pieces, 8 ... lever, 9 ... springs, 10 ... gear parts, 11,12
... Cam surface, 20 ... Trigger voltage generator, P ... Pin.

Claims (1)

[Claims] 1. The attraction force releasing operation of a self-holding solenoid is performed by applying an attraction force release voltage at least twice or more near a desired timing of releasing the attraction force of the self-holding solenoid. Self-holding solenoid control device.