JPS5810199Y2 - magnetic recording and reproducing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic recording and reproducing device equipped with a clock device with a timer function, and its purpose is to cause the magnetic recording and reproducing device to perform recording or reproducing operations for a preset time using the clock device. In this case, the recording or reproducing operation can be continued with a simple operation even after the set time has elapsed, and sudden changes in the set time can be easily handled.

BACKGROUND ART Conventionally, the operation of various electrical devices has been controlled by a clock device with a timer function.

For example, one-point control can energize an electrical device to operate it at a preset time, or turn off the power to the electrical device and stop its operation at a preset time. , set two times in advance, and set 2 times.
Only the specified time between times.

Two-point control is used to operate electrical equipment.

Using this two-point control clock device allows electrical equipment to operate for a predetermined period of time from a desired time, and then automatically stop operating after a predetermined period of time has elapsed.
It has a wider range of applications and is easier to use than a single-point control type clock device.

For example, consider incorporating a two-point control type clock device into a magnetic recording/reproducing device to control the recording or reproducing operation of the magnetic recording/reproducing device, and record only radio programs from 5:00 to 5:15. In this case, the recording operation starts at 5:00 and stops at 5:15, and tape running is stopped, so you can use the tape without wasting it and completely record only the desired signal. 1. It is convenient.

However, in this case, for example, if you want to record outside for 10 minutes just before the stop time of 5:15, the above-mentioned device cannot easily change the set time, and the stop time cannot be changed. Inconveniences such as the stop time coming and the equipment being stopped while you are trying to change it, or the equipment being stopped before the originally set stop time of 5:15 due to an incorrect method of changing the stop time. takes precedence.

Also, if you have to go out for some urgent business before the 5:15 stop time arrives, you can leave the device as described above and the device will be able to run the tape at 5:15. Permanent deformation of the pinch roller as the pinch roller is left pressed against the capstan through the tape.

This increases the risk of permanent elongation of the parts constituting the tape running mechanism, especially the springs.

Therefore, the present invention was developed in view of these conventional problems.

The time set in advance for causing the device to perform a recording or reproducing operation can be freely changed using a simple configuration and simple operation.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a recording/playback circuit, which amplifies the audio signal from a recording input terminal 2 connected to a microphone, radio receiver, etc., supplies it to a recording/playback head 3, and records it on a magnetic tape (cassette tape) 4. , the signal of the tape 4 reproduced from the head 3 is amplified and supplied to the speaker 5, and the speaker 5 generates reproduced sound.

6.7 is a capstan and a pinch ruler for pinching the cassette tape 5 and running it in the direction of the arrow; 8 and 9 are a supply reel stand and a take-up reel stand on which the cassette tape 4 is mounted.

Reference numeral 10 denotes a tape running detection circuit for detecting the running state of the magnetic tape 40, which is arranged to face a rotating slit plate 11 which is rotated in conjunction with the 90 revolutions of the take-up reel table, with this rotating slit plate 11 in between. lamp 12 and light receiving element 13
It is made up of.

To explain the operation of this detection circuit 10, when the magnetic tape 4 is running, the reel stand 9 is rotated and the slit plate 11 is also rotated once, so the light from the lamp 12 passes through the slit 11a of the slit plate 11. through the light receiving element 1
Since the pulse signal is intermittently sent to the end of the light receiving element 13, that is, the output end 14 of the detection circuit 10, when the magnetic tape 4 reaches the end and is stopped, the take-up reel stand 9 Since both the rotary slit plate 11 and the rotary slit plate 11 stop rotating, no pulse output appears at the output terminal 14 of the detection circuit 10.

Next, 15 is a control circuit which receives the pulse output of the detection circuit 10 and generates a positive voltage on the output side only while this output is being generated to operate the play electromagnetic plunger 16.

The plunger 16 is for pressing the pinch collar 7 against the capstan 6.

Reference numeral 17 denotes a motor for driving the tape running 1 which provides rotational force to the capstan 6, take-up reel stand 9, etc.

Next, to explain the power supply side, 18 is a connection plug connected to a commercial AC power supply AC, 19 is a main power transformer, and between the primary winding 19a of this transformer 19 and the plug 18, there is a heavy duty switch 20 and a relay switch. 21 are connected to each other, and the switches 20 and 21 and the primary winding 19a of the transformer 19 form a series circuit.

The secondary winding 19b of the transformer 19 is connected to a power supply terminal 24 via rectifying diodes 22 and 23.

This power supply terminal 24 is connected to the recording/playback circuit 1. Tape running detection circuit 10. Control circuit 15. It is connected to a load such as a motor 17.

Therefore, the switch 20 on the primary side of the transformer 19.
DC voltage is supplied from the power supply terminal 24 to the load side only when both terminals 21 are closed.

Further, the connection plug 19 is connected to the primary winding 25a of the sub power transformer 25, and the secondary winding 25b of the transformer 25.
is the rectifier diode 26. It is connected to a power supply terminal 28 via a smoothing capacitor 27.

Therefore, whenever the connection plug 18 is connected to an AC power supply, a DC voltage is output to the power supply terminal 28.

Next, 29 is a control circuit for closing the relay switch 21, which includes a relay switch driving relay 31 connected to the power supply terminal 28 via a resistor 30, and this relay 3.
1 and ground, and a resistor 33 connected to the base of this transistor 320.
It consists of

This control circuit 29 has a resistor 3 connected to the base of a transistor 320.
When a positive lock control signal is applied through 3, the transistor 32 becomes conductive, and the relay 31 operates, and the relay switch 2
1 is closed.

Three systems of circuits are provided to obtain control signals for operating the control circuit 29.

One is a circuit system consisting of a manually operated switch 35 and a backflow prevention diode 36 connected in series between the power supply terminal 28 and the input terminal 34 of the control circuit 290 via a diode 38, which will be described later.

This circuit system applies a positive voltage to the input terminal 34 of the control circuit 290 by closing and opening the operation switch 35.
The relay switch 21 can be closed by operating the relay switch 21.

Another circuit system is a circuit system that supplies a control signal automatically generated from the clock device 37 to the input terminal 34 of the control circuit 290 via the backflow prevention diode 38.

Since the clock device 37 plays an important role in this circuit system, the configuration will be explained first.1 The clock device 37 includes a digital time display section 39 composed of a display body such as a fluorescent display tube, It is comprised of a clock circuit 40 that causes the display section 39 to display the time.

This clock circuit 40 has a timer function in addition to the time display function which is the original function of a clock.

That is, when the desired time is displayed on the display section 39 and a timer start switch (not shown) is pressed, the current time is redisplayed on the display section 39, and at the same time, a positive voltage control signal is output from the terminal 40a, The normal timer function stops the control signal output from the terminal 4Qa when the set desired time is reached, and when the sleeve switch (not shown) is pressed, the display 39 displays, for example, 59 minutes, and at the same time the terminal A positive voltage control signal is output from 40b,
It has a sleeve timer function in which the display of 59 minutes is counted down as time passes, and when it reaches 0 minutes, the output from the terminal 40b is stopped.

Another timer function is a function that outputs a control signal only between two preset times.

The two terminals 4Qa and 40b are connected to resistors 41.
42, and this common connection point is further connected to the input terminal 34 of the control circuit 290 via the diode 38, so that any time preset in the clock device 37 or a preset fixed time can be used. only control circuit 2
9 can be operated to close the relay switch 21.

Next, still another control signal generation circuit system is a circuit consisting of a manual operation switch 43 and a backflow prevention diode 44 connected in series between the output terminal of the operation control circuit 15 and the input terminal 34 of the control circuit 290 described above. It is a system.

This circuit system works only when the magnetic tape 4 is running and a positive voltage is output from the operation control circuit 15. In this state, by closing the switch 43, the control circuit 29 is operated and the relay is activated. This allows the switch 21 to remain closed.

Next, the timer operation in the above embodiment will be explained.

First, open the operation switch 43, operate the playback button and the record button, and close the power switch 20 to enter a recording standby state.

It is assumed that a radio broadcast signal is applied to the recording input terminal 2 and that this signal is being monitored.

In this state, for example, when the clock device 24 is operated as a sleeve, a predetermined time such as 59 minutes is displayed on the display section 39 and counting begins, and at the same time, a control signal of a positive voltage is output from the terminal 40b.

This control signal operates the control circuit 29, closes the relay switch 21, and starts energizing the load side such as the motor 17.

As the motor 17 rotates, the take-up reel stand 9 associated with the motor 17 rotates by operating the playback button, and as a result, a pulse signal is output from the tape running detection circuit 10, and the tape running control circuit 15 operates to perform the plan. Jar 16 works.

The pinch roller 7 is brought into pressure contact with the capstan 6, the tape starts running, and a recording state is entered.

The radio broadcast signal applied to the recording input terminal 2 is supplied to the head 3 through the recording/reproducing circuit 1 and recorded on the tape 4.

When the recording progresses and the set time of the clock device 37 has elapsed, the control signal output from the terminal 40b is stopped, so the control circuit 29 stops operating, the relay switch 21 is opened, and the power to the load is cut off. The device is stopped with the pinch row (7) pressed against the capstan (6).

In this way, if you wish to record a little more before the apparatus is stopped, you can close the operation switch 43.

That is, when the switch 43 is closed while the armature circuit 29 is being operated by the control signal from the clock device 37.

Since the output voltage of the tape running control circuit 15 is applied to the input terminal 34 of the control circuit 290 via the switch 43 and the diode 44, even if the control signal from the clock device 37 disappears, the control circuit 29 remains in the operating state. The recording operation continues.

When the switch 43 is opened at an appropriate point, the control circuit 29 becomes inactive, and the relay switch 21 is opened to cut off power to the load and stop the apparatus.

Further, as described above, even when the user has to go out for a quick errand before the device is controlled by the clock device 37 and automatically comes to a stop state, it is sufficient to close the operation switch 43 and go out.

If the switch 43 is kept closed in this manner, the recording operation continues even after the control signal from the clock device 37 disappears as described above.

Then, when the tape reaches the end or is stopped due to wrapping around the capstan 6, etc., the rotation of the reel stand 90 is stopped due to the stoppage of the tape 4, so the pulse output from the tape running detection circuit 10 disappears and the tape running control circuit 1
5 no longer outputs positive voltage, plunger 16
And the control circuit 29 becomes inactive.

Therefore, when the capstan 6 and the pinch roller 7 are released, the switch 21 is returned to open, and the current supply to the load side is cut off.

By the way, if the operation switch 35 is closed in advance, normal recording, playback, etc. operations can be performed by turning on the power switch 20.

Furthermore, the mechanical switch in the above embodiments may be constructed of an electronic switch using a transistor, SCR, or the like.

In particular, it is advantageous to use an electronic switch as the relay 18 of the control circuit 16 because it consumes less voltage.

Furthermore, the present invention is not limited to the audio tape recorder shown in the embodiment, but can also be applied to video tape recorders and the like.

As described above, according to the magnetic recording and reproducing apparatus of the present invention, in addition to being able to perform recording and reproducing operations for a predetermined period of time determined by a clock device, the magnetic recording apparatus generates an output only while the magnetic tape is running. By inputting the running detection circuit and its output to the control circuit of the switch means together with the output of the clock device via a manually operated switch,
If it is decided to record beyond the predetermined time set by the clock device, the recording can be continued with a simple operation of closing the manual operation switch, thereby freeing the user from the troublesome operation of the clock device. It is very convenient.

Further, the above-mentioned manual operation switch opens and closes the output of the tape running detection circuit. That is, an effective output can be obtained by closing one manual operation switch only while the magnetic tape is running.

Therefore, by closing this manual operation switch while the magnetic tape is running, the operating state of the magnetic tape can be maintained until it reaches its end, and it is possible to extend the recording time when recording with a clock device or to suddenly leave the location. It has excellent operability and is convenient for use when

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. 1... Recording/playback circuit, 2... Recording input terminal - 4... To magnetic tape 6... Capstan, T... Pinch Laura, 10...
... Tape running detection circuit, 17... Tape running drive motor, 20... Power switch (first
(switch means), 21...Relay switch (
(second switch means), 29...control circuit, 31...clock device, 43...manual operation switch.

Claims (1)

[Claims for Utility Model Registration] A first switch means and a second switch means separate from the first switch means are provided connected in series, and the first switch means is connected in series. Power is supplied to loads such as a recording/reproducing circuit system and a tape drive motor through a series circuit formed by the second switch means. A control circuit for closing the second switch means, a clock device for outputting a control signal for operating this control circuit for a predetermined period of time, and a clock device for detecting the running state of the magnetic tape and detecting the running state of the magnetic tape. The output end of the tape running detection circuit is connected to the input end of the control circuit via a manually operated switch, and the control circuit is activated by a control signal from the clock device. When the manually operated switch is closed while the second switch means is in operation and the second switch means is closed. Even if the control signal from the clock device is stopped, the control circuit is maintained in an operating state while the output of the tape running detection circuit is being generated, and the second switch means is maintained in a closed state. A magnetic recording/reproducing device characterized by: