JPH0349139B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a tape recorder, and particularly to a first tape recorder.
The present invention relates to an operation control circuit for a tape recorder in which a tape recorder and a second tape recorder are incorporated. (b) Prior Art Recently, so-called double tape recorders, in which two tape recorders are built into the same device, have become popular. Some of these double tape recorders include a dubbing operation in which the signal played by the first tape recorder is recorded in the second tape recorder, and when the playback operation of one tape recorder is completed, the playback operation of the other tape recorder is started. Some devices are configured to perform continuous playback operations. As a method for performing a continuous playback operation in which when the playback operation of one tape recorder is completed, the playback operation of the other tape recorder is started, the rotational operation of the electric motor is controlled as disclosed in Japanese Patent Publication No. 54-2565. Method and Special Public Service 1977-2566
As disclosed in the above publication, a method of mechanically releasing the paused state is common. Further, such continuous playback operation is performed using an automatic stop device that detects when the magnetic tape reaches its end and switches the tape recorder from a playback operation state to a stop state. (c) Object of the Invention The present invention aims to provide an operation control circuit that can perform continuous reproduction operation with a simple configuration. (D) Structure of the Invention The present invention provides a tape recorder incorporating a first tape recorder and a second tape recorder each having a playback function, a pause function, and an automatic stop function.
The first one is closed when the tape recorder is in the playback state and opened when the tape recorder is in the stop state.
switch, the second switch is closed when the second tape recorder is in the playback state, and is opened when the second tape recorder is in the stop state, and the first switch is opened by a suction operation.
First step to release the tape recorder from paused state
a second plunger that releases the paused state of the second tape recorder through a suction operation; a first plunger drive circuit provided to drive the first plunger;
a second provided to drive the plunger;
a first drive signal generating circuit that outputs a drive signal for operating the second plunger drive circuit for a predetermined time when the plunger drive circuit and the first switch are switched from a closed state to an open state; a second drive signal generation circuit that outputs a drive signal for operating the first plunger drive circuit for a predetermined period of time when the switch is switched from the open state to the open state; and the second drive signal generation circuit when the first switch is in the open state. a first blocking means for blocking application of a drive signal from the first drive signal generating circuit to the first plunger drive circuit; and a second blocking means for blocking the application operation to the drive circuit. (E) Embodiment The illustrated circuit is an embodiment of the operation control circuit of the present invention, and a switch for selecting whether or not to perform continuous reproduction operation is omitted. 1 is a first switch which is closed when the first tape recorder is in the playback state and opened when the first tape recorder is stopped; A second terminal 1b is provided. 3 is a second switch which is closed when the second tape recorder is in the playback state and opened when the second tape recorder is in the stopped state; A second terminal 3b is provided. 5 is a first plunger that releases the paused state of the first tape recorder by a suction operation; 6 is a first plunger drive circuit provided to drive the first plunger 5;
The drive transistor 7 is connected as a load, and the control transistor 8 is connected to control the operation of the drive transistor 7. 9 is a second plunger that releases the paused state of the second tape recorder by a suction operation; 10 is a second plunger drive circuit provided to drive the second plunger 9; and the second plunger 9 is a load. The drive transistor 11 is connected to the drive transistor 11, and the control transistor 12 is connected to control the operation of the drive transistor 11. 13 is connected between the first terminal 1a of the first switch 1 and the base of the control transistor 12 constituting the second plunger drive circuit 10 , and the first switch 1 is changed from the closed state to the open state. a first outputting a signal which, when switched, causes the control transistor 12 to conduct for a predetermined period of time;
This is a drive signal generation circuit, and is composed of a capacitor 14 and a resistor 15. 16 is connected between the first terminal 3a of the second switch 3 and the base of the control transistor 8 constituting the first plunger drive circuit 6 , and the second switch 3 is changed from the closed state to the open state. This is a second drive signal generation circuit that outputs a signal that makes the control transistor 8 conductive for a predetermined time when switched, and is composed of a capacitor 17 and a resistor 18.
Reference numeral 19 denotes the base of a control transistor 8 whose base is connected to the first terminal 1a via a resistor 20 and whose collector constitutes the first plunger drive circuit 6 in order to be controlled by the opening/closing operation of the first switch 1. A first blocking transistor connected to the control transistor 8 and whose emitter is grounded, and has the function of controlling application of the drive signal from the second drive signal generation circuit 16 to the base of the control transistor 8. . 21 is the second switch 3
The base is connected to the first terminal 3a via the resistor 22, and the collector is connected to the base of the control transistor 12 constituting the second plunger drive circuit 10 , and the emitter is controlled by the opening/closing operation of the plunger. A second blocking transistor that is grounded, and is connected to the control transistor 12 of the drive signal from the first drive signal generation circuit 13.
It has the function of controlling the operation of applying the voltage to the base. Although the operation control circuit of the present invention is configured as described above, each of the first and second tape recorders according to the present invention has an automatic stop device that automatically stops the tape recorder when the magnetic tape runs to the end. It is equipped with The present invention is configured as described above, and next, continuous reproduction operation will be explained. First, the continuous playback operation from the first tape recorder to the second tape recorder will be explained. . Such an operation is performed by placing the first tape recorder in a playback state and placing the second tape recorder in a paused state in the playback state. In such a state, the first
Both the switch 1 and the second switch 3 are in the closed state, so that the first blocking transistor 19 and the second blocking transistor 21 are both non-conducting. Further, the control transistor 8 constituting the first plunger drive circuit 6 and the drive transistor 7 whose operation is controlled by the control transistor 8 are in a non-conducting state. Similarly, the control transistor 12 constituting the second plunger drive circuit 10 and the drive transistor 11 whose operation is controlled by the control transistor 12 are in a non-conductive state. In this state, the first tape recorder continues to play, but when the magnetic tape reaches its end, the automatic stop device cancels the playback and returns the first tape recorder to its stopped state. When the first tape recorder is returned to the stopped state, the first switch 1, which was in the closed state, is opened. When the first switch 1 is opened, a charging current flows through the capacitor 14 forming the first drive signal generating circuit 13 , and the charging current flows through the control transistor 12 forming the second plunger driving circuit 10 via the resistor 23.
A bias current flows through the base of the current for a predetermined period of time.
As a result, the control transistor 12 is reversed to a conductive state, and along with this reversal, the drive transistor 11 is reversed to a conductive state for a predetermined period of time. When the drive transistor 11 is reversed to a conductive state, the second plunger 9 connected to its collector as a load is brought into suction operation. As a result, the second tape recorder is released from the paused state by the suction operation of the second plunger 9,
The reproduction operation of the second tape recorder is started.
When the second tape recorder is performing a reproducing operation, the first switch 1 is open, so the first blocking transistor 19 is in a conductive state. The reproduction operation of the second tape recorder is performed, and when the magnetic tape reaches the end, the reproduction operation is canceled by the action of the automatic stop device and the second tape recorder is returned to the stopped state. Second
When the tape recorder is returned to the stopped state, the second switch 3, which was in the closed state, is opened. When the second switch 3 is opened, a charging current flows into the capacitor 17 constituting the second drive signal generating circuit 16 , but in such a state, the first blocking transistor 19 is in a conductive state, so the charging current is 1 does not flow to the base of the control transistor 8 constituting the plunger drive circuit 6 . Therefore, the control transistor 8 and the drive transistor 7 are never turned on, and the first plunger 5, which is connected as a load to the collector of the drive transistor 7, does not perform a suction operation. After the continuous reproduction operation from the first tape recorder to the second tape recorder is performed in this way, both the first tape recorder and the second tape recorder come to a stopped state. As described above, the continuous playback operation from the first tape recorder to the second tape recorder is performed. Next, the continuous playback operation from the second tape recorder to the first tape recorder will be explained. This operation is performed by placing the second tape recorder in a playback state and placing the first tape recorder in a paused state in the playback state. In such a state, the first switch 1 and the second switch 3 are both closed, and therefore the first blocking transistor 19 and the second blocking transistor 21 are both non-conducting. The reproduction operation of the second tape recorder is carried out in this state, but when the magnetic tape has run to the end, the reproduction operation is canceled by the action of the automatic stop device and the second tape recorder is returned to the stopped state. When the second tape recorder is returned to the stopped state, the second switch 3, which was in the closed state, is opened. When the second switch 3 is opened, the second drive signal generation circuit 1
A charging current flows through the capacitor 17 forming the first plunger drive circuit 6, and the charging current flows through the resistor 24 to the base of the control transistor 8 forming the first plunger drive circuit 6 as a bias current for a predetermined period of time. As a result, the control transistor 8 is inverted to a conductive state, and along with the inversion operation, the drive transistor 7 is inverted to a conductive state for a predetermined period of time. When the drive transistor 7 is reversed to a conductive state, the first plunger 5 connected to its collector as a load is caused to perform a suction operation. As a result, the first tape recorder is released from the paused state by the suction operation of the first plunger 5, and the reproduction operation of the first tape recorder is started. When the first tape recorder is performing a reproducing operation, the second switch 3 is open, so the second blocking transistor 21 is in a conductive state. The playback operation of the first tape recorder is performed, and when the magnetic tape has run to the end, the playback operation is canceled by the action of the automatic stop device and the first
The tape recorder is returned to a stopped state. When the first tape recorder is returned to the stopped state, the first switch 1, which was in the closed state, is opened. When the first switch 1 is opened, the first
Capacitor 1 forming drive signal generation circuit 13
However, in such a state, the second blocking transistor 21 is in a conductive state, so the charging current does not flow to the base of the control transistor 12 constituting the second plunger drive circuit 10 . Therefore, the control transistor 12 and the drive transistor 11 are never turned on, and the second plunger 9, which is connected as a load to the collector of the drive transistor 11, does not perform a suction operation. After the continuous reproduction operation from the second tape recorder to the first tape recorder is performed in this way, both the first tape recorder and the second tape recorder come to a stopped state. As described above, since the continuous playback operation from the first tape recorder to the second tape recorder and the continuous playback operation from the second tape recorder to the first tape recorder are performed, when one tape recorder is in the playback operation state, By repeating the operation of causing the other tape recorder to pause in the playback mode, it is possible to repeat the continuous playback operation. In addition, in this explanation, continuous playback is performed to the other tape recorder by switching to the stop state by the automatic stop device when the magnetic tape ends, but the tape recorder is switched to the stop state by the stop operation. It goes without saying that by switching between the two tape recorders, it is possible to perform continuous playback to the other tape recorder. (F) Effects of the Invention The operation control circuit of the present invention is a drive device that causes the plunger to perform a suction operation by the action of a switch that is changed from a closed state to an open state when one tape recorder is switched from a playback state to a stop state. Since the continuous playback operation is performed by generating a signal and releasing the paused state of the other tape recorder by the suction operation of the plunger, this method is superior to the method of mechanically canceling the paused state. This has the advantage that the configuration is simple. Further, when one tape recorder is in a stopped state, even if the other tape recorder is switched from a playback state to a stop state, the blocking means prevents the operation of applying a drive signal to the plunger drive circuit when the switch is opened. The present invention has the effect that unnecessary suction operation of the plunger can be prevented. The operation of the blocking means for blocking the operation of applying the drive signal to the plunger drive circuit upon opening of the switch is controlled by the switch that is opened and closed by the regeneration operation and also controls the operation of generating the drive signal. Therefore, since the switch is also used, there is no need to provide a switch that can be changed by the temporary stop operation, and therefore the configuration is simplified.
The present invention is most suitable as an operation control circuit for a tape recorder having a continuous playback function.

[Brief explanation of drawings]

The illustrated circuit is one embodiment of the operation control circuit of the present invention. Explanation of main drawing numbers, 1...1st switch, 3...
Second switch, 5...First plunger, 6 ...
First plunger drive circuit, 9...Second plunger, 10 ...Second plunger drive circuit, 13
...First drive signal generation circuit, 16 ...Second drive signal generation circuit, 19...First blocking transistor, 21...Second blocking transistor.

Claims (1)

[Claims] 1. In a tape recorder incorporating a first tape recorder and a second tape recorder each having a playback function, a pause function, and an automatic stop function, when the first tape recorder is in a playback state, it is in a closed state and in a stopped state. A first switch is in an open state at a certain time, a second switch is in a closed state when the second tape recorder is in a playback state, and is in an open state when the second tape recorder is in a stopped state. a first plunger for releasing a stopped state; a second plunger for releasing a second tape recorder from a paused state by a suction operation; a first plunger drive circuit provided to drive the first plunger; A second plunger drive circuit is provided to drive two plungers, and when the first switch is switched from a closed state to an open state, the second plunger drive circuit is operated for a predetermined period of time to drive the second plunger. a first drive signal generation circuit that outputs a drive signal for causing a suction operation; and when the second switch is switched from a closed state to an open state, the first plunger drive circuit is operated for a predetermined time to suck the first plunger. a second drive signal generation circuit that outputs a drive signal for operation; and an operation controlled by the opening/closing operation of the first switch, and an output from the second drive signal generation circuit when the first switch is in an open state. a first blocking means for blocking application of a drive signal to the first plunger drive circuit, and an operation controlled by an opening/closing operation of the second switch, and when the second switch is in an open state; Said first
An operation control circuit for a tape recorder comprising second blocking means for blocking application of a drive signal output from a drive signal generation circuit to the second plunger drive circuit.