JPS6228728Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a plunger drive circuit, for example, a plunger drive circuit used as a channel change flange of a tape player. be.

(Prior Art) Conventionally, when performing a channel change (switching the running direction of the tape) in a tape player, the stoppage of tape running is detected, and the detection signal is used to drive a plunger to reel the tape. The rotation direction of the base is reversed, and the head and pinch rollers are changed.

(Problem that the invention aims to solve) At this time, if the reason why the tape stops running is other than a normal cause such as the tape reaching its end, in other words, the reel base drive is stopped due to some kind of failure. If this becomes impossible, even if the plunger is driven as described above and other mechanisms enter the channel change state, the tape will not be able to resume running. In this case, the rotation detecting section of the tape player detects the stoppage of tape running again and issues a drive signal for channel change to the plunger, so that the plunger is driven again. If tape running is stopped due to an abnormality on the reel base drive mechanism side, the plunger is driven continuously until the tape starts running, and as a result, the plunger generates heat and eventually burns out. This inconvenience arises.

The present invention was proposed in order to eliminate such inconveniences, and its purpose is to: If a predetermined operation performed by the plunger is not completed even if the plunger operates a certain number of times, To provide a plunger drive circuit which stops driving the plunger and prevents the plunger from being burnt out due to heat generation.

[Structure of the idea]

(Means for Solving the Problems) In order to achieve the above object, the plunger drive circuit of the present invention has a mechanism part that is driven by a solenoid and performs a predetermined operation. A solenoid drive unit that generates a solenoid drive signal is connected, a solenoid that is driven by a drive signal from the solenoid drive unit is connected to this solenoid drive unit, and the solenoid drive unit counts the number of outputs of the solenoid drive signal. , a counter section that issues a count end signal when the number of outputs reaches a predetermined value is connected, and a mechanism control section that issues a mechanism stop signal in response to the count end signal from the counter section is connected to the counter section. .

(Function) In the present invention having the above configuration,
If a failure occurs in the mechanism and the specified operation is not performed despite the solenoid being driven, and the solenoid drive signal is issued many times, the counter will count the solenoid drive signals and the count value will be When a predetermined number of counts is reached, a count end signal is sent to the mechanism stop section, and the mechanism control section that receives this count end signal issues a mechanism stop signal, making it possible to stop the mechanism before the solenoid burns out. It is.

(Example) Hereinafter, an example of the present invention will be specifically described.
In this embodiment, the plunger drive circuit of the present invention is applied to a plunger for channel changing of a tape player, but the present invention is not necessarily limited to this embodiment, and can be applied to plungers used for other purposes. is also applicable.

*Configuration of Embodiment* In the figure, reference numeral 1a is a reel base of a tape player, 1b is a rotation signal generator provided near the reel base 1a, and 2 is a rotation detector connected thereto. Such a rotation signal generating section 1b and a rotation detecting section 2 are conventionally known as described in Japanese Utility Model Publication No. 49-35291 and Japanese Utility Model Publication No. 50-3695. By detecting changes in the magnetic field lines of the rotating magnet installed in the reel base using a magneto-sensitive resistance element or magnetic head, it is possible to detect the stoppage of rotation of the reel base, and to detect changes in the perforated disc that rotates with the reel base and the holes in this disc. It is possible to use a device that detects the rotation stop of the reel base by detecting the amount of light that has passed through the light receiving element.

A solenoid drive unit 3 that generates a solenoid drive signal based on the rotation stop detection signal from the rotation detection unit 2 is connected to the rotation detection unit 2, and a channel driven by the solenoid drive signal is connected to the solenoid drive unit 3. solenoid for change
SOL is connected. A counter section 5 is connected to the solenoid drive section 3 via a waveform shaping section 4 . This counter section 5 counts the number of outputs of the solenoid drive signal, and outputs a count end signal when the number of outputs reaches a predetermined value. This counter section 5 is connected to a mechanism control section 6 of the tape player which outputs a mechanism stop signal in response to a count end signal from the counter section 5.The mechanism control section 6 of the tape player outputs a mechanism stop signal in response to a count end signal from the counter section 5. mechanism has come to stop.

Here, the waveform shaping section 4 includes the solenoid drive section 3.
It converts the solenoid drive signal output from the solenoid drive signal into a waveform signal suitable for operating the counter section 5, and a conventionally known linear waveform shaping circuit such as an RC circuit can be used. Further, the counter section 5 may be constructed by connecting several stages of flip-flop circuits as described in Pulse Digital Switch Circuit, Vol. 2, page 932, published by Kindai Kagakusha. In this case, the maximum value of the driving signal to be counted is determined by the number of flip-flop circuits to be connected. The mechanism control unit 6 is one that is normally used in tape players, such as a tape end detection mechanism that turns off the power to the tape player and stops the mechanism when the end of the tape is detected, and can be used as is. can do.

On the other hand, the rotation signal generating section 1b is supplied with a reset signal generating section 8 via a waveform shaping section 7 similar to that described above.
is connected. Since the reset signal generating section 8 only needs to generate one pulse from the input signal from the rotation signal generating section 1b, a pulse generating circuit such as a monostable multivibrator can be used, for example.

This reset signal generating section 8 is connected to the counter section 5.
The counter section 5 receives the reset signal from the reset signal generating section 8 and clears the count number of the solenoid drive signal. Further, as described above, the output terminal of the counter section 5 is connected to the mechanism control section 6, and at the same time, the output terminal of the counter section 5 is connected to the reset signal generation section 8.
The reset signal generating section 8 is also connected to the input terminal of the count end signal in the input terminal of the count end signal, and the reset signal generating section 8 generates a reset signal by inputting this count end signal.

*Operation of the embodiment* Next, the operation of the plunger drive circuit of the present invention having such a configuration will be explained.

During normal operation First, during a normal channel change, the rotation of the reel base 1a causes a signal generated by the rotation signal generator, such as a change in the magnetic field lines of a magnet provided on the reel base or a change in the amount of light passing through a perforated disc. is detected by a rotation detecting section 2 such as a magneto-sensitive resistance element, a magnetic head, or a light receiving element. If the signal from the rotation signal generator 1b is not detected for a certain period of time, the rotation detector 3 determines that the tape has reached the end and outputs a rotation stop detection signal to the solenoid drive unit 3. Upon receiving the rotation stop signal, it outputs a drive signal to the channel change solenoid SOL. As a result, the channel change solenoid SOL operates based on this drive signal and switches each tape mechanism to the opposite side of the tape. In other words, as is conventionally known, due to the suction force of the solenoid SOL,
The head and pinch roller are moved to a position matching the running direction of the tape via links and cams, and the rotational direction of the idler and motor is switched to reverse the rotational direction of the reel base.

In this case, when the solenoid drive signal unit 3 issues a drive signal to the channel change solenoid SOL, this drive signal is simultaneously input to the counter unit 5 via the waveform shaping unit 4. That is, the drive signal for the solenoid is generally
It is not suitable for the trigger pulse of the flip-flop circuit used as the counter section 5.
The waveform shaping section 4 shapes the solenoid drive signal into a pulse such as a square wave suitable for operating the counter section 5. In the counter section 5,
Counting of the drive signal from the solenoid drive section 3 is started. That is, when several stages of flip-flop circuits are connected as the counter section 5, the trigger pulse from the waveform shaping section 4 causes the first
The flip-flop circuit in the second stage is set to the "1" state.

However, when the running direction of the tape is reversed and the reel base 1a rotates again due to the operation of the channel solenoid SOL, a rotation signal is generated from the rotation signal generating section 1b, and this rotation signal is transmitted to the waveform shaping section 7. After being shaped into a signal with a waveform suitable for detection by the reset signal generating section 8, the signal is input to the reset signal generating section 8. The reset signal generating section 8 receives this rotation signal and outputs, for example, a one-pulse type reset signal to the counter section 5, so that the counter section 5 receives this reset signal and clears the count value of the drive signal counted so far. do. That is, when the counter section 5 is composed of a plurality of stages of flip-flop circuits, one pulse from the reset signal generating section 8 using a circuit such as a monostable multivibrator can be inputted to each stage of flip-flop circuits. Then, all flip-flop circuits are returned to the "0" state.

In this way, even if a drive signal is input to the counting section during normal operation, this drive signal will be changed to the drive signal generated from the solenoid drive section 3 upon detecting the rotation stop of the reel base at the next channel change. It is never added.

At the time of failure Next, when the reel base 1a stops due to a failure or other cause, the reel base 1a stops rotating based on the rotation stop detection signal from the rotation detection unit 2 that detects the rotation stop of the reel base, as in the case of normal channel change operation. Then, the solenoid drive section 3 outputs a solenoid drive signal. Even if the channel change solenoid SOL is activated by the drive signal, the reel base 1a
does not start rotation, no rotation signal is generated from the rotation signal generation section 1b, and no rotation signal is input to the reset signal generation section 8, so the reset signal generation section 8 resets the counter section 5. Unable to output signal. Therefore, the counter section 5 records the count value of the drive signal from the solenoid drive section 3 as is.

If the reel base 1a continues to be stopped, the rotation detection unit 2 detects rotation stoppage at regular intervals and outputs a rotation stop signal to the solenoid drive unit 3, so the solenoid drive unit 3 receives this and starts driving the solenoid. Solenoid for changing the signal channel
Output to SOL and counter section 5. Then, in the counter section, the flip-flop circuit in the first stage is inverted and becomes "0" state, and in response to the output, the flip-flop circuit in the second stage becomes "1".
The second output of the solenoid drive signal is counted due to the change in the state of the flip-flop circuit of the plurality of stages.

This second drive signal causes the solenoid to
Even if SOL is activated, reel base 1a remains
If the rotation detection unit 2 does not start rotating, the rotation detection unit 2 further outputs a rotation stop signal at regular time intervals, and in response to this, the solenoid drive unit 3 repeatedly outputs a drive signal, and the counter unit 5 Count the number of times the drive signal is output.

In this way, when the number of drive signals counted by the counter section 5 reaches the specified number, a count end signal is generated from the counter section 5, and this signal activates the mechanism control section 6 to turn off the power. Each mechanism of the tape player is stopped by means such as, and the channel change solenoid is
The drive of SOL is also stopped. If you do this,
Since the solenoid does not operate continuously more than a predetermined number of times, destruction of the solenoid due to heat generation is prevented.

The count end signal from the counter section 5 is thus inputted to the mechanism control section 6, but at the same time, it is also inputted to the reset signal generation section 8, and along with this, the count end signal from the reset signal generation section 8 is inputted to the mechanism control section 6. Since the reset signal is input to the counter section 5,
The count number of the solenoid drive signal in the counter section 5 is cleared and set so that counting can be started from the initial state when the mechanism is driven again.

*Other embodiments* The present invention is not limited to the above embodiments. For example, the waveform shaping sections 4 and 7 provided before the counter section 5 and the reset signal generation section 8 may If the signal from the rotation signal generating section 1b is suitable as an input signal to the counter section 5 and the reset signal generating section 8, there is no need to provide it. In addition, the number of counts of the drive signal in the counter section 5 may be only one time, but since there is a possibility that the problem on the mechanism side will be resolved during several operations, it is necessary to count the drive signal an appropriate number of times without causing damage to the plunger. It is possible to do so.

[Effect of idea]

As shown in the above embodiments, according to the plunger drive circuit of the present invention, if the operation of the mechanism is not completed even after the plunger has operated a certain number of times, the drive of the plunger is stopped.
There is no problem in that the plunger is continuously driven due to an abnormality on the mechanism side, generates heat, and eventually burns out. Furthermore, since it is possible to stop the continuous driving of the plunger and at the same time stop the driving of other mechanical parts, it is possible to discover failure points in mechanical parts at an early stage. This has the effect of making it easier to repair the mechanism. In particular, in the past, there was a risk of complex failures such as burnout due to heat generated by the plunger in addition to failure of the mechanical parts that caused it, but with this invention, such inconveniences are completely eliminated. .

[Brief explanation of the drawing]

The drawing is a block diagram showing an example of the plunger drive circuit of the present invention. 1a... Reel base, 1b... Rotation signal generation section, 2... Rotation detection section, 3... Solenoid drive section, 4... Waveform shaping section, 5... Counter section, 6...
. . . mechanism control section, 7 . . . waveform shaping section, 8 . . . reset signal generation section.

Claims (1)

[Claims for Utility Model Registration] (1) a. A solenoid drive unit that generates a solenoid drive signal when the mechanism operates is connected to a mechanism unit that is driven by a solenoid to perform a predetermined operation. b Connect a solenoid driven by a drive signal from the solenoid drive unit to the solenoid drive unit. c. A counter section is connected to the solenoid drive section, which counts the number of outputs of the solenoid drive signal and issues a count end signal when the number of outputs reaches a predetermined value. d. A mechanism control section is connected to the counter section, which issues a mechanism stop signal in response to a count end signal from the counter section. A plunger drive circuit characterized by having the above configuration requirements a to d. (2) The plunger drive circuit according to claim 1, wherein the counter section is connected to a reset signal generating section that generates a reset signal for clearing the count value of the counter section. (3) The mechanism section is a reel base of a tape player equipped with a rotation signal generation section and a rotation detection section,
2. The plunger drive circuit according to claim 1, wherein the solenoid drive circuit is connected to a rotation detection section of the mechanism section, and the mechanism control section controls the rotation of a tape reel base.