JPH0262885B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head shift mechanism for a tape player, and in particular to a head shift mechanism that continuously drives a head shift solenoid when the head section cannot be held at the playback position. This relates to a mechanism that automatically stops the drive of a solenoid when the mechanism is not operated.

In the head shift mechanism of a tape player,
The mechanism that moves the head forward from the stop position to the playback position by driving a solenoid will not be able to hold the head in the playback position if any malfunction occurs in the mechanism that holds the head in the playback position. . At this time, the tape end detection section, which conventionally detects when the rotation of the reel base has stopped, indicates that the mechanism is not being played back, that is, the head section cannot be held at the playback position and the tape cannot run. This tape end detection section sends a command signal to the solenoid drive circuit again to drive the head shift solenoid. Even after this, if the head is not held at the playback position, a head shift signal will be issued again from the tape end detector, and the solenoid will be driven continuously unless an eject operation is performed or the power is turned off. As a result, current is passed through the solenoid continuously for a long time, resulting in heat generation and burnout of the solenoid.

The present invention has been proposed to overcome the drawbacks of the conventional head shift mechanism as described above. That is, an object of the present invention is to prevent inconveniences such as heat generation and burnout by stopping the driving of the solenoid when the solenoid for advancing the head cannot hold the head in the regeneration position even after operating a certain number of times continuously. The object of the present invention is to provide a head shift mechanism that can

The present invention will now be specifically explained based on illustrated embodiments.

A rotation signal generating section 2 provided near the reel base 1 of the tape player is composed of a Hall IC, a reed switch, etc., and generates a signal accompanying the rotation of the reel base 1. This rotation signal generating section 2 is connected to a counting section 3 and a running stop detecting section 4.

The running stop detection section 4 is a rotation signal generating section 2 for a certain period of time.
If there is no input signal from , it is determined that the tape has stopped, and an output signal is sent to the logical OR circuit 5 at the next stage. The logical OR circuit 5 is further connected to a channel changeover switch 6 and a power supply voltage rise detection section 7. The power supply voltage rise detection section 7 detects the rise of the power supply voltage and sends a signal when the tape player is powered on. The logic OR circuit 5 is connected to a solenoid drive signal generation section 8 provided at the next stage, and the solenoid drive signal generation section 8 is connected to a solenoid drive section 9 and the head shift (forward)/channel switching driven by the solenoid drive section 9. It is connected to the shared solenoid 10. The solenoid 10 is mechanically configured for channel switching operations when the heads are in the play position and for head shifting when the heads are not in the play position.

In addition to the rotation signal generating section 2, a solenoid drive signal generating section 8 is connected to the counting section 3. That is, the counting section 3 counts the solenoid drive signals sent from the solenoid drive signal generating section 8, and when a predetermined set number of times is reached, the head shift stop section 1 provided at the next stage of the counting section 3 is activated.
At the same time as the count end signal is sent to the counter 1, the counting section 3 becomes the initial state. Further, the counting section 3 is also set to the initial state by a reset signal sent from the rotation signal generating section 2. The head shift stop section 11 is a driving means for an eject mechanism for ejecting a cassette pack from the tape player in the case of an auto-eject type tape player, and is a power source for the tape player in the case of other types of tape players. This is for controlling the operation stop of the cutting means or mechanism.

The operation of the head shift mechanism of the present invention having the above-mentioned configuration will be explained below.

First, when the power supply line of the mechanism is started by turning on the power to the main mechanism or by inserting a cassette, a signal is sent from the power supply voltage rise detection section 7 that detects this, and a solenoid drive signal is generated via the logic OR circuit 5. The unit 8 is operated and the signal is sent to the counting unit 3 and the solenoid drive unit 9, thereby driving the solenoid 10.
Since the tape player was stopped at this time, the head was not in the playback position, so the solenoid 10 acted as a head shifter. At this point, the head is at the playback position, and like the head, when the tape drive system enters the playback state, the tape runs and the reel base 1 rotates, so the count section 3 is reset by a signal from the rotation signal generator 2.

On the other hand, if the head does not move and enters the playback state, the tape drive system will not enter the playback state either, and the reel base 11 will not rotate. Then, the running stop detection section 4 detects this and sends a signal to the solenoid drive signal section 8 via the OR circuit 5, and the signal is again sent from the solenoid drive signal section 8 to the count section 3 and the solenoid drive section 9. , the head shift solenoid 10 is activated. If the head is still not held in the reproducing state, the above operation is repeated, and the counting section 3 counts the number of times this operation is performed. When the set count is reached, the count section 3 sends a count end signal to the head shift stop section 1.
1. By this signal, the stop section 11
Now, if the mechanism is capable of auto-ejecting, it will auto-eject, eject the cassette pack, and stop the tape player, and if it is not possible, the solenoid 10 will control the mechanism to stop its operation, etc. Prevent it from being driven more than that. Furthermore, in the case of an operation such as auto-eject, the solenoid 10 is used for channel switching or auto-eject, and performs the same operation as described above.

As described above, according to the head shift mechanism of the present invention, if the head is not held at the regeneration position even if the solenoid operates a certain number of times continuously, the drive of the solenoid can be automatically stopped. This has the effect of preventing problems such as burnout due to heat generation.

Incidentally, in tape players that use a common solenoid for the head shift solenoid and the solenoid for performing operations such as switching the playback direction or auto-ejecting at the end of the tape, the tape end detection circuit detects when the tape is stopped. It detects this and drives a solenoid to change the direction of travel. Therefore, there is not only a malfunction in the head shift, but also a malfunction in the mechanism that switches the running direction at the end of the tape, and no matter how many times the solenoid is driven, the running direction cannot be switched.
Even when the tape does not start running, the driving of the solenoid is similarly stopped after a certain number of cycles, which also has the effect of protecting the solenoid.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an example of the head shift mechanism according to the present invention. 1...Reel base, 2...Rotation signal generator,
3... Count section, 4... Running stop detection section, 5...
...Logic OR circuit, 6...Channel selection switch, 7...Power supply voltage rise detection section, 8...Solenoid drive signal generation section, 9...Solenoid drive section,
10... Solenoid, 11... Head shift stop part.

Claims (1)

[Scope of Claims] 1. A tape player in which a solenoid is driven by a drive signal from a solenoid drive section to move and hold a head section at a playback position, comprising: a solenoid drive signal generation section; and a solenoid drive signal generation section. a counting section that is connected to the solenoid drive signal generating section and counts the solenoid drive signal from the solenoid drive signal generation section; A head shift mechanism characterized by comprising a head shift stop section that allows the head shift to stop.