JPH0510734B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a cassette-type tape recorder in which a first tape recorder having a playback function and a second tape recorder having a recording and playback function are built into the same cabinet. This invention relates to a recorder operation control circuit. (b) Prior Art Recently, so-called double cassette type tape recorders, in which two tape recorders having the above-mentioned functions are built into the same cabinet, have become popular. Further, a cassette type tape recorder using a cassette tape is equipped with a sliding substrate that is moved to an operating position during playback and recording operations to bring the magnetic head into contact with the magnetic tape stored in the cassette. The movement of the sliding board to the operating position was previously configured to be performed by using the pressing force on the playback operation button, but recently, the movement of the sliding board to the operating position was performed using the rotational force of an electric motor. is being developed. For example, there is a technology disclosed in Japanese Utility Model Application Publication No. 58-62461 that uses the rotational force of an electric motor to displace a sliding board to an operating position. It is generally called a soft mechanism because it requires less force to operate. Among the double cassette tape recorders mentioned above, there is a dubbing operation in which the signal played back by the first tape recorder is recorded by the second tape recorder, and when the playback operation of one tape recorder is completed, the other tape recorder starts playing. There is a device in which a continuous playback operation is performed in which the operation is started. A tape recorder equipped with a dubbing function requires a function to simultaneously start the playback operation of the first tape recorder and the recording operation of the second tape recorder. As a technique that was developed by
There is one disclosed in Publication No. 58-159655. Further, there is a technique disclosed in Japanese Utility Model Application Laid-open No. 159654/1983 as a technique in which the above-described continuous regeneration operation is performed by controlling the rotational operation of an electric motor. Some recent tape recorders are tape recorders that have a recording and playback function in the second direction, which is the opposite direction of the first direction, in addition to the recording and playback function in the first direction. is being developed. The magnetic head used in such a tape recorder with a reciprocating recording and playback function is a fixed magnetic head in which a magnetic head corresponding to tracks in the first direction and a magnetic head corresponding to tracks in the second direction are integrated. A rotary head is commonly used, but recently there have been many that use a rotating head, as disclosed in Japanese Patent Application Laid-open No. 59-68813. A technique has been developed in which the rotational displacement of the rotary head is performed using the rotational force of an electric motor. (C) Problems to be Solved by the Invention In a tape recorder configured to perform the above-described continuous playback operation by controlling the rotational operation of an electric motor, the rotational displacement operation of the rotary head is performed using the rotational force of the electric motor. If this technique is adopted, the following problems arise. That is, when the tape recorder in which the rotary head is incorporated is in the playback standby state, the motor is in a state where the rotation is stopped;
When the rotary head is reversed in such a state, the stopped motor continues to rotate for a predetermined period of time, causing the tape recorder to start playing, or in the case of a tape recorder with a built-in soft mechanism, to move the sliding board. There is a problem in that the pinch roller and the capstan are moved to a fixed position and then stopped in a state where the pinch roller and the capstan are pressed together. The present invention aims to provide an operation control circuit that is improved in this respect. (d) Means for Solving the Problems The operation control circuit of the present invention controls the first switch which is in the closed state when the playback operation button provided on the first tape recorder is locked in the operating position. a first electric motor for driving the magnetic tape of a first tape recorder; and a first electric motor that is activated when the first switch is in the closed state and the first electric motor is activated.
A first motor drive circuit that rotates the electric motor; a second switch that is closed when the playback operation button provided on the second tape recorder is locked in the operating position; A running direction switching switch that is closed when the recording/playback direction is switched and is kept closed until the direction switching operation is completed, and a running direction switch that drives the magnetic tape of the second tape recorder and when the running direction is switched. a second electric motor for rotationally displacing the rotary head; and a second electric motor for rotating and driving the second electric motor when the second switch is in the closed state and when the running direction changeover switch is in the closed state. a motor drive circuit, which prevents rotational drive of the second motor by closing the second switch when the first tape recorder is in the playback mode, and closes the first switch when the second tape recorder is in the playback mode; a control circuit that prevents the rotational drive of the second electric motor due to the closing;
a blocking circuit that prevents rotational driving operation of the second electric motor by closing the running direction changeover switch when the first tape recorder is in a playback operation state and the second tape recorder is in a playback operation state; It is configured. (e) Effect The present invention prevents the rotating operation of the electric motor when the second tape recorder is in a state where the rotating operation of the electric motor is stopped due to the reproducing operation of the first tape recorder, and when an operation to switch the reproduction direction is performed. It was designed to do so. (F) Embodiment The illustrated circuit is an embodiment of the operation control circuit of the present invention. In the figure, 1 is a first electric motor that drives the magnetic tape of a first tape recorder having at least a playback function, and 2 is a first electric motor that drives the magnetic tape of a second tape recorder that has a recording and playback function, and also when switching the running direction. A second electric motor for rotationally displacing the rotary head. 3
4 is a first drive transistor whose collector is connected to the first motor 1 as a load and whose emitter is connected to a power supply; 4 is a transistor whose collector is connected through a resistor 5 to control the operation of the first drive transistor 3; This is a first control transistor connected to its base and whose emitter is grounded, and constitutes a first motor drive circuit 6 together with the first drive transistor 3 . 7 is a second drive transistor whose collector is connected to the second motor 2 as a load and whose emitter is grounded; 8 is a second drive transistor whose collector is connected to its base via a resistor 9 in order to control the operation of the second drive transistor; a second control transistor whose emitter is connected to the ground and which is grounded;
A second motor drive circuit 10 is configured together with the second drive transistor 7. 11 is a first NOR circuit whose output terminal is connected to the base of the first control transistor 4 constituting the first motor drive circuit 6 via a resistor 12; It has one input terminal 11a and a second input terminal 11b. 14 is a second NOR circuit whose output terminal is connected to the second input terminal 11b of the first NOR circuit 11 via a resistor 15;
The first input terminal 14a is connected to the output terminal of
and a second connected to the power supply via the resistor 17.
It has an input terminal 14b. Reference numeral 18 denotes a first switch that is closed when the playback operation button provided on the first tape recorder is locked in the operating position, and is connected to the first input terminal 11a of the first NOR circuit 11. The first terminal 18
a and a second terminal 18b which is grounded. Reference numeral 19 denotes a second switch that is closed when the playback operation button provided on the second tape recorder is locked in the operating position, and is connected to the second input terminal 14b of the second NOR circuit 14. The first terminal 19a is grounded and the second terminal 19a is grounded.
A terminal 19b is provided. 20 and 21 are selection switches that are switched in conjunction with each other and select a dubbing operation, and common terminals 20a, 21
a, first terminals 20b, 21b and second terminals 20c, 21c are connected to the common terminals 20a, 21a during dubbing operation. The common terminal 20a of the selection switch 20 is grounded, and the first terminal 20b is connected to the second input terminal 11b of the first NOR circuit 11 and the first input terminal 14a of the second NOR circuit 14 through diodes 22 and 23, respectively. It is connected. Further, the first terminal 21b of the selection switch 21 is connected to the first terminal 18a of the first switch 18 via a resistor 24 and a diode 25. 26 is a recording switch that is closed when the recording operation button provided on the second tape recorder is locked in the operating position;
A first terminal 26a is connected to the first terminal 20b of the selection switch 20, and a second terminal 26a is connected to the first terminal 20b of the selection switch 20.
A terminal 26b is provided. Reference numeral 27 denotes a recording/playback changeover switch which is switched to the recording side, which is the opposite side from the state shown in the figure, when the sliding board is displaced to the operating position by the rotation of the second electric motor 2 accompanying the recording operation of the second tape recorder; Recording side terminal 27 connected to common terminal 21a of selection switch 21
r, a common terminal 27c connected to a power source, and an open reproduction side terminal 27p. 2
8 is an inverter whose input terminal is connected to the output terminal of the second NOR circuit 14;
It has the function of inverting the level of the signal output to the output terminal of the 2NOR circuit 14. A third NOR circuit 29 has an output terminal connected to the base of the second control transistor 8 constituting the second motor drive circuit 10 via a diode 30 and a resistor 31, and is connected to the output terminal of the inverter 28. The first input terminal 29a is grounded via the resistor 32, and the first terminal 18a of the first switch 18 and the first terminal 21b of the selection switch 21 are connected via the diode 25 and the resistor 24, respectively.
The second input terminal 29b is connected to the second input terminal 29b. 33 is a fourth NOR circuit having a first input terminal 33a connected to the output terminal of the third NOR circuit 29 and a second input terminal 33b connected to the first terminal 19a of the second switch 19; 34 is an output a fifth NOR circuit whose terminal is connected to the base of the second control transistor 8 via a diode 35 and a resistor 31, and a first input terminal 3 connected to the output terminal of the fourth NOR circuit 33;
4a and a second input terminal 34b connected to a power supply via a resistor 36. Reference numeral 37 denotes a running direction changeover switch that is closed when the recording/playback direction of the second tape recorder is switched and is kept in the closed state until the direction changeover operation is completed; 34b
The first terminal 37a is connected to the ground, and the second terminal 37b is grounded. In such a configuration, the playback operation button of the first tape recorder;
The playback operation button and the recording operation button of the second tape recorder are configured to be locked in the operating position by a push button locking mechanism. Also the first
The second tape is moved so that when the first electric motor 1 starts rotating due to the reproduction operation of the tape recorder, the sliding substrate on which the magnetic head is mounted is displaced to the operating position by the rotational force of the first electric motor 1. When the second electric motor 2 starts rotating due to playback and recording operations of the recorder, the sliding substrate on which the magnetic head is mounted is moved to the operating position by the rotational force of the second electric motor 2. When the sliding board is displaced to the operating position by the recording operation of the second tape recorder, the recording/playback switch, which switches the amplifier circuit, etc. from the playback state to the recording state, is switched from the playback side to the recording side. . The operation control circuit of the present invention is constructed as described above, and the operation of this circuit will be explained next.
First, the case where the selection switches 20 and 21 are in the illustrated state, that is, in the non-dubbing state, will be described. When the first tape recorder and the second tape recorder are in a stopped state, the first switch 18, the second switch 19, the recording switch 26, and the running direction changeover switch 37 are in an open state. In this state, the output signals of the first NOR circuit 11, the third NOR circuit 29, and the fifth NOR circuit 34 are all at L (low) level, and the output signals of the first control transistor 4 and the second
Control transistor 8 is in a non-conducting state. When the first tape recorder is operated for reproduction in this state, the reproduction operation button is locked in the operating position and the first switch 18 is closed.
When the first switch 18 is closed, the first input terminal 11a of the first NOR circuit 11 is grounded and an L level signal is input, so the output terminal of the first NOR circuit 11 receives an H (high) level signal. A signal is output.
When an H level signal is output to the output terminal of the first NOR circuit 11, a bias current flows to the base of the first control transistor 4 constituting the first motor drive circuit 6 , and the first control transistor 4 becomes conductive. Become. When the first control transistor 4 becomes conductive, the first drive transistor 3 is biased and becomes conductive, and a drive current flows to the first motor 1 whose collector is connected as a load. Start rotating. Said first
When the electric motor 1 starts rotating, its rotational force displaces the sliding substrate to the operating position and the drive mechanism enters the playback state, thereby establishing the playback operating state of the first tape recorder. When the first tape recorder is stopped while in the playback mode, the sliding board returns to the non-operating position and the first switch returns to the non-operating position when the playback operation button is unlocked. 18 will be released. When the first switch 18 is opened, the first switch 18 is opened.
Since the level of the output signal of the 1NOR circuit 11 becomes L level, the first motor drive circuit 6 becomes inactive, and the first motor 1 stops rotating. The reproduction operation of the first tape recorder is performed as described above. Next, the operation of the second tape recorder will be explained. When the second tape recorder is operated for reproduction in the illustrated state, the reproduction operation button is locked in the operating position and the second switch 19 is closed. When the second switch 19 is closed, the second input terminal 1 of the second NOR circuit 14
4b is grounded and an L level signal is input, so an H level signal is output to the output terminal of the second NOR circuit 14. The H level signal output to the output terminal of the second NOR circuit 14 is sent to the inverter 2.
8, it is inverted to L level by the third NOR circuit 2.
9 is input to the first input terminal 29a. Said No.
Since the input level of the second input terminal 29b of the 3NOR circuit 29 is held at L level by the resistor 32, when an L level signal is input to the first input terminal 29a, the input level of the second input terminal 29b of the 3NOR circuit 29 is held at the L level. An H level signal is output. Said third NOR circuit 29
When an H level signal is output to the output terminal of
A bias current flows through the base of the second control transistor 8 constituting the motor drive circuit 10, and the second
Control transistor 8 becomes conductive. When the second control transistor 8 becomes conductive, the second control transistor 8 becomes conductive.
The drive transistor 7 is biased and becomes conductive, and a drive current flows to the second motor 2 connected as a load to its collector, and the second motor 2 starts rotating. When the second electric motor 2 starts rotating, its rotational force displaces the sliding board to the operating position, and the drive mechanism enters the playback state, thereby configuring the playback operation state of the second tape recorder. . When the second tape recorder is stopped while in the playback mode, the sliding board returns to the non-operating position, and the second switch also returns to the non-operating position when the playback operation button is unlocked. 19 will be released. The reproduction operation of the second tape recorder is performed in this way, but the recording operation will be explained next. The recording operation of the second tape recorder is performed by operating the playback operation button while operating the recording operation button. When such an operation is performed, the recording operation button and the playback operation button are locked in the operating position, and the recording switch 26 and the second switch 19 are closed in conjunction with the locking. When the second switch 19 is closed , the second control transistor 8 and the second drive transistor 7 constituting the second motor drive circuit 10 become conductive and drive the second motor 2 to rotate, as described above. When the second electric motor 2 starts rotating, the sliding board is displaced to the operating position by its rotational force, but since the recording operation button is being operated at this time, the sliding board is displaced to the operating position. As a result, the recording/playback switch 27 is switched to the recording side, which is the opposite side from the state shown in the figure. Even if the recording/playback changeover switch 27 is switched to the recording side, no effect will be exerted on the circuit because the selection switch 21 is in the non-dubbing position shown. Therefore, when the recording/playback selector switch is switched to the recording side as the sliding board is displaced to the operating position, the circuit enters a state for performing a recording operation, and the drive mechanism also enters a state for performing a recording operation. This constitutes the recording operation state of the second tape recorder. In such a recording operation state, the second
When the tape recorder is stopped, the sliding board is returned to the non-operating position, and the recording operation button and the playback operation button are also returned to the non-operating position. As a result of this operation, the recording/playback switch 27 is switched to the playback side as shown, and the recording switch 26 and second switch 19 are opened, and the second tape recorder is brought to a halt. The reproduction and recording operations of the second tape recorder are performed in this manner. Next, the operation of switching the reproduction direction and the recording direction will be explained. This switching operation is carried out by closing the running direction changeover switch 37, but first a case will be described in which it is carried out when the second tape recorder is in a stopped state. In the stopped state, since an L level signal is output to the output terminal of the third NOR circuit 29, an L level signal is applied to the first input terminal 33a of the fourth NOR circuit 33. On the other hand,
Since the second switch 19 is in an open state, an H level signal is applied to the second input terminal 33b of the 4NOR circuit 33, and therefore an L level signal is applied to the output terminal of the fourth NOR circuit 33. It is in the output state. Therefore, an L level signal is applied to the first input terminal 34a of the fifth NOR circuit 34, which is connected to the output terminal of the fourth NOR circuit 33. When the user performs an operation to change the running direction in such a state, the running direction changeover switch 3
7 is closed. When the travel direction changeover switch 37 is closed, an L level signal is input to the second input terminal 34b of the fifth NOR circuit 34.
An H level signal is output to the output terminal of the 5NOR circuit 34. H is applied to the output terminal of the fifth NOR circuit 34.
When the level signal is output, the second control transistor 8 constituting the second motor drive circuit 10 is biased and becomes conductive, thereby causing the second drive transistor 7 to become conductive. When the second driving transistor 7 becomes conductive, power is supplied to the second motor 2 connected to the collector as a load, and the second motor 25 starts rotating. When the second electric motor 2 starts rotating, the switching mechanism becomes operational by switching the running direction, and the rotating head is rotationally displaced by the rotational force of the second electric motor 2, and the drive mechanism is rotated in the opposite direction. The state is switched to the state where the drive is performed. When the switching operation is completed, the traveling direction changeover switch 37 is opened, and the second input terminal 34b of the fifth NOR circuit 34 is connected to the high level.
Since a level signal is applied to the output terminal, L
A level signal is output. Therefore, the second electric motor drive circuit 10 becomes inactive, and the second electric motor 2 stops rotating. In this manner, the running direction is switched when the vehicle is in the stopped state.Next, a case will be described in which the running direction is switched when the vehicle is in the regenerating state. If the running direction is switched while the second tape recorder is in the playback mode, the switching mechanism is operated because the second electric motor 2 is in the rotating mode, and the rotating head is rotated by the rotational force of the second electric motor 2. At the same time as the second tape recorder is displaced, the drive mechanism becomes in a state of driving in the opposite direction, and the second tape recorder becomes in a state of reproducing operation in the opposite direction. Also, if you change the running direction while recording is in progress, the second
Since the electric motor 2 is in the rotating state, the rotary head is rotated and the drive mechanism is switched in the opposite direction, so that the second tape recorder enters the recording state in the opposite direction. As described above, the operation is performed when only one of the first tape recorder and the second tape recorder is operated.Next, the continuous playback operation will be explained. Such continuous playback operation is performed by selection switches 20, 2.
First, the continuous reproduction operation from the first tape recorder to the second tape recorder, which is performed when the tape recorder 1 is in the illustrated state, will be explained. This operation is performed by performing a playback operation on the first tape recorder and then a playback operation on the second tape recorder. When the first tape recorder is operated for playback, the first switch 18
When the first electric motor 1 is closed, the rotation operation of the first electric motor 1 is started, and the reproduction operation state of the first tape recorder is established. When the second tape recorder is operated for reproduction while the first tape recorder is in the reproduction operation state, the reproduction operation button is locked in the operating position and the second switch 19 is closed. When the second switch 19 is closed, the second NOR circuit 14
An L level signal is input to the second input terminal 14b of the first NOR circuit 11.
Since the H level signal which is the output of the second NOR circuit 14 is applied, the L level signal is output to the output terminal of the second NOR circuit 14. Therefore, the 3rd NOR
An H level signal is not output to the output terminal of the circuit 29, and the second electric motor 2 is not driven to rotate. In this way, if the second tape recorder is operated while the first tape recorder is in the playback operation state, the playback operation button is locked in the operating position, but since the second electric motor 2 is not rotationally driven, the sliding board The displacement operation to the operating position is not performed, and the reproduction operation of the second tape recorder is not started. In this state, the first
When the tape recorder starts playing and the magnetic tape reaches the end, an automatic stop device built into the first tape recorder stops the first magnetic tape.
The tape recorder is returned from the playback state to the stop state. When the first tape recorder returns to the stopped state, the first switch 18, which was in the closed state, is opened, so that the signal input to the first input terminal 11a of the first NOR circuit 11 becomes H level. As a result, the output signal of the first NOR circuit 11 becomes H.
Since the level becomes L level, the first motor drive circuit 6 becomes inactive, and the first motor 1 stops rotating. The output signal of the first NOR circuit 11 is L
When the signal reaches the L level, the signal input to the first input terminal 14a of the second NOR circuit 14 becomes the L level.
An H level signal is output to the output terminal of the 2NOR circuit 14. When an H level signal is output to the output terminal of the second NOR circuit 14, the second NOR circuit 14
An H level signal is output to the output terminal of the 3NOR circuit 29, and the second motor drive circuit 10 rotates the second motor 2. When the second electric motor 2 is rotationally driven, the reproduction operation state of the second tape recorder is established and the reproduction operation is started as described above. In this way, if the second tape recorder is operated while the first tape recorder is in the playback operation state, the second tape recorder enters the playback standby state, and the first tape recorder is stopped by the automatic stop device or by the stop operation. When the second tape recorder is returned to the stopped state, the reproduction operation of the second tape recorder is started, and a continuous reproduction operation is performed from the first tape recorder to the second tape recorder. In this way, the continuous playback operation from the first tape recorder to the second tape recorder is performed, but the second tape recorder
A case will be described in which the user performs a playback direction switching operation while the tape recorder is in a playback standby state. When the playback direction is changed, the running direction changeover switch 37 is closed as described above.
An L level signal is input to the second input terminal 34b of the 5NOR circuit 34. When the second tape recorder is in the playback standby state, an L level signal, which is the output of the third NOR circuit 29, is applied to the first input terminal 33a of the fourth NOR circuit 33, and the second input terminal 33b is applied. Since the second switch 19 is closed, an L level signal is applied, and therefore an H level signal is output to the output terminal of the fourth NOR circuit 33. Therefore, the above
The H level signal which is the output signal of the 4NOR circuit 33 is input to the first input terminal 34a.The output signal of the 5th NOR circuit 34 is input to the traveling direction changeover switch 37.
Due to the closing of , even if an L level signal is input to the second input terminal 34b, it will not be inverted to H level. Therefore, the second electric motor 2 is not driven to rotate, and the second tape recorder is kept in a playback standby state. In this way the second
If the running direction is switched while the tape recorder is in the playback standby state, the rotational driving operation of the second electric motor 2 is blocked, so that the standby operation of the second tape recorder is not affected in any way. There is no. 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. Such an operation is performed by performing a playback operation on the second tape recorder and then a playback operation on the first tape recorder. When the playback operation on the second tape recorder is performed, the second switch 19 is activated as described above.
is closed, and the second electric motor 2 starts rotating, thereby setting up the reproduction operation state of the second tape recorder. When the first tape recorder is operated for playback while the second tape recorder is in the playback operation state, the playback operation button is locked in the operating position and the first switch 18 is closed. When the first switch 18 is closed, the first NOR circuit 11
An L level signal is input to the first input terminal 11a of , but the second NOR circuit 14 is input to the second input terminal 11b.
Since the H level signal which is the output of the first NOR circuit 11 is applied, the L level signal is output to the output terminal of the first NOR circuit 11. Therefore, the first electric motor drive circuit 6 is in a non-operating state and the first electric motor 1 is not driven to rotate. In this way, if the first tape recorder is operated while the second tape recorder is in the playback operation state, the playback operation button is locked in the operating position, but the first electric motor 1
is not rotationally driven, the sliding substrate is not moved to the operating position, and the first tape recorder does not start playing. The second tape recorder starts playing in this state, and when the tape reaches the end, the second tape recorder starts playing.
An automatic stop device incorporated in the tape recorder causes the second tape recorder to return from the playback state to the stopped state. When the second tape recorder returns to the stopped state, the second switch 19, which was in the closed state, is opened.
The signal input to the second input terminal 14b of the 2NOR circuit 14 becomes H level. As a result, the output signal of the second NOR circuit 14 changes from the H level to the L level, so the second motor drive circuit 10 becomes inactive, and the second motor 2 stops rotating. Said No.
When the output signal of the 2NOR circuit 14 becomes L level, the
Since the signal input to the second input terminal 11b of the 1NOR circuit 11 goes to the L level, an H level signal is output to the output terminal of the first NOR circuit 11. Applicable number
When an H level signal is output to the output terminal of the 1NOR circuit 11, the first motor drive circuit 6
enters the operating state and drives the first electric motor 1 to rotate. When the first electric motor 1 is rotationally driven, the first
The playback operation state of the tape recorder is configured and playback operation is started. In this way, if the first tape recorder is operated while the second tape recorder is in the playback operation state, the first tape recorder enters the playback standby state, and the second tape recorder is stopped by the automatic stop device or by the stop operation. When the stopped state is restored, the first tape recorder starts playing, and the second tape recorder starts playing the first tape recorder.
A continuous playback operation to the tape recorder is performed. As described above, 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. The operation of recording a signal obtained from a radio receiving device or the like using a tape recorder will be explained. This operation is performed by performing a playback operation on the first tape recorder and a recording operation on the second tape recorder when the selection switches 20 and 21 are in the non-dubbing position shown. When the first tape recorder is operated for reproduction, the reproduction operation button is locked in the operating position and the first switch 18 is closed. When the first switch 18 is closed, an H level signal is output to the output terminal of the first NOR circuit 11 as described above, and the first motor drive circuit 6 causes the first
The driving operation of the electric motor 1 causes the first tape recorder to enter a playback operation state. When a recording operation is performed on the second tape recorder while the first tape recorder is in the playback operation state, the recording operation button and the playback operation button are locked and held in the operating position, and the recording switch 26 and the second switch 19 are also locked. is closed. When the recording switch 26 is closed, the
Even though an H level signal is output to the output terminal of the 1NOR circuit 11, an L level signal is input to the first input terminal 14a of the second NOR circuit 14. Therefore, by closing the second switch 19, the second input terminal 14b of the second NOR circuit 14
When an L level signal is input to the second NOR circuit 14, an H level signal is output to the output terminal of the second NOR circuit 14.
When an H level signal is output to the output terminal of the second NOR circuit 14, the second motor drive circuit 10 becomes operational as described above and rotationally drives the second motor 2, thereby causing the recording operation of the second tape recorder. The state is configured. In this way, if the first tape recorder is in the playback mode and the second tape recorder is operated for recording, the second tape recorder is set to the recording mode, so radio broadcasting can be performed while the first tape recorder is in the playback mode. Signals etc. can be recorded by a second tape recorder. If a recording operation is performed on the second tape recorder while the first tape recorder is in the playback mode, the operation will be performed, but when the second tape recorder is in the recording mode, the playback operation on the first tape recorder will be performed. The case where this is done will be explained. When the second tape recorder is in the recording operation state, an H level signal is output to the output terminal of the second NOR circuit 14, but since the recording switch 26 is closed, the second input terminal 11b of the first NOR circuit 11 is in a state where an L level signal is input. Therefore, when the first switch 18 is closed by the playback operation of the first tape recorder, the output signal of the first NOR circuit 11 becomes H level, and the playback operation state of the first tape recorder is configured as described above. . In this way, the reproduction operation of the first tape recorder and the recording operation of the second tape recorder can be performed independently of each other. As described above, each operation is performed when the selection switches 20, 21 are in the illustrated state.Next, the operation when the selection switches 20, 21 are in the opposite state from the illustrated state will be explained. do. When the selection switch 20 is switched to the opposite side from the state shown in the figure, a state is entered in which an L level signal is input to the second input terminal 11b of the first NOR circuit 11 and the first input terminal 14a of the second NOR circuit 14. Therefore, when the first tape recorder is operated for reproduction, the first switch 18 is closed and an H level signal is output to the output terminal of the first NOR circuit 11.
When you perform playback operations on the second tape recorder, the second
When the switch 19 is closed, an H level signal is output to the output terminal of the second NOR circuit 14, so that both the first electric motor 1 and the second electric motor 2 are driven to rotate. Therefore, when a playback operation is performed on the first tape recorder and the second tape recorder, the playback operation of each tape recorder is performed regardless of the operation of the other tape recorder. As described above, the reproduction operation of each tape recorder is performed when the selection switches 20 and 21 are on the dubbing side, which is the opposite side from the state shown in the figure. The dubbing operation for recording with a tape recorder will be explained. Such dubbing operation is
This is accomplished by performing a recording operation on the second tape recorder when the selection switches 20, 21 are in a state opposite to the state shown, and then performing a playback operation on the first tape recorder. When a recording operation is performed on the second tape recorder, as described above, the second switch 19 is closed and the second motor drive circuit 10 is activated, and the second
The electric motor 2 is driven to rotate. When the second electric motor 2 rotates, the sliding board is displaced to the operating position by its rotational force, and as the sliding board is displaced to the operating position, the recording/playback switch that switches the electric circuit as described above is switched to the recording side. At the same time, the recording/playback switch 27 is switched to the recording side, which is the opposite side from the state shown. When the recording and playback switch 27 is switched to the recording side, the recording and playback switch 27, the selection switch 21 and the resistor 2
4 through the second input terminal 29 of the third NOR circuit 29
An H level signal is applied to b. As a result,
Since the output signal of the 3NOR circuit 29 is inverted from the H level to the L level, the second motor drive circuit 10 becomes inactive, and the second motor 2 stops rotating.
Therefore, the second tape recorder enters a recording standby state in which the magnetic tape stops running while the amplifier circuit, drive mechanism, etc. remain set in the recording state. When the first tape recorder is operated in such a state, the playback operation button is locked in the operating position and the first switch 18 is closed. When the first switch 18 is closed, the third NOR circuit 2
Since the level of the signal input to the second input terminal 29b of the third NOR circuit 29 becomes L level, the output signal of the third NOR circuit 29 becomes H level rather than L level. Said No.
When the output signal of the 3NOR circuit 29 becomes H level, the second motor drive circuit 10 becomes operational and drives the second motor 2, which has been in a stopped state, to rotate. Therefore, the recording operation of the second tape recorder, which was in the recording standby state, is started. Then, as the first switch 18 is closed, the first electric motor 1 starts rotating and the first tape recorder is set to the playback operation state, so that the signal played by the first tape recorder is transferred to the second A state to be recorded by a tape recorder, that is, a dubbing state is configured. By performing the playback operation of the first tape recorder in this way, the recording operation of the second tape recorder can be started simultaneously with the playback operation of the first tape recorder, so that the dubbing operation can be easily performed. The dubbing operation is performed as described above, but if you stop the first tape recorder in order to replace the magnetic tape on the playback side while in the dubbing state, the playback operation button will return to the non-operating position. The accompanying opening of the first switch 18 causes the first
The tape recorder stops. Further, when the first switch 18 is opened, the third NOR circuit 29
Since an H level signal is applied to the second input terminal 29b of the third NOR circuit 29, the output signal of the third NOR circuit 29 is inverted from the H level to the L level. As a result, the second electric motor drive circuit 10 becomes inactive, the second electric motor 2 stops rotating, and the second tape recorder again enters the recording standby state. Therefore, if the magnetic tape of the first tape recorder is replaced and the playback operation is performed again, the dubbing operation can be started by the above-described operation. Further, when the second tape recorder is stopped while in the dubbing operation state, the second tape recorder is returned to the stop state as described above, but the first tape recorder continues to perform the reproduction operation. The dubbing operation is performed as described above, but next, a case will be described in which the running direction is switched while the second tape recorder is in the recording standby state described above. When the second tape recorder is in a recording standby state, an L level signal is output to the output terminal of the third NOR circuit 29, and the second
Since the switch 19 is closed, the first input terminal 33a and the second input terminal 33 of the fourth NOR circuit 33
Both of them are in a state where an L level signal is input. Therefore, an H level signal is output to the output terminal of the fourth NOR circuit 33, and the fourth NOR circuit 33 outputs an H level signal.
The first input terminal 34a of the 5NOR circuit 34 has that H level.
A level signal is being input. Therefore, even if the running direction changeover switch 37 is closed by the running direction switching operation and an L level signal is input to the second input terminal 34b, an H level signal is not output to the output terminal of the fifth NOR circuit 34. No matter what, the second
The electric motor 2 is not driven to rotate. Therefore,
Not only is the magnetic tape in the recording standby state not driven to run, but the rotational displacement of the rotary head is not performed, and the recording standby operation of the second tape recorder is not affected in any way. Furthermore, if the second tape recorder is stopped while it is in the dubbing operation state, the second tape recorder is returned to the stop state as described above, and the first tape recorder continues to play. Next, a case will be described in which a recording operation is performed on the second tape recorder while the first tape recorder is in the playback state. When the first tape recorder is in the playback mode, the second tape recorder
When the tape recorder is operated to record, the second switch 19 is closed and an L level signal is input to the second input terminal 14b of the second NOR circuit 14. As a result, as described above, an H level signal is output to the output terminal of the third NOR circuit 29, and the second electric motor 2 is rotationally driven by the operation of the second electric motor drive circuit 10. When the second electric motor 2 starts rotating, the recording/reproduction changeover switch 27 is switched to the recording side, which is the opposite side from the state shown in the figure, by the displacement of the sliding board to the operating position. However, in such a state, the first switch 18 is in the closed state, so even if the recording/playback selector switch 27 is switched, the first switch 18 is closed.
Since no H level signal is input to the second input terminal 29b of the 3NOR circuit 29, the rotational driving operation of the second electric motor 2 continues, and the second tape recorder enters the recording operation state. In this way, if you perform a recording operation on the second tape recorder while the first tape recorder is in the playback mode, the second tape recorder will start recording while listening to the signal being played back by the first tape recorder. This is useful when selecting and recording. Each operation in this embodiment is performed as described above, but when the second tape recorder is in the recording standby state in the dubbing state, the selection switch 2 is
0, 21 to the non-dubbing state shown in the figure, the level of the signal input to the second input terminal 29b of the third NOR circuit 29 becomes L level from H level, so its output signal is inverted to H level, and as a result, The rotation of the second electric motor 2 allows the second tape recorder to start recording. In this embodiment, a case has been described in which the reciprocating recording and reproducing function is incorporated only in the second tape recorder, but it is of course possible to incorporate the reciprocating reproducing function or the reciprocating recording and reproducing function in the first tape recorder. Further, a first NOR circuit 11 and a second NOR circuit 1 are used as control circuits for controlling the rotational operation of the first electric motor 1 incorporated in the first tape recorder and the second electric motor 2 incorporated in the second tape recorder.
4. Using the inverter 28 and the third NOR circuit 29, a fourth NOR circuit 33 and a fifth NOR circuit 3 are used as a blocking circuit for blocking the rotational displacement operation of the rotary head.
4 was used, but it can be easily configured using a microcomputer or the like. (G) Effects of the Invention The operation control circuit of the present invention is such that a tape recorder configured to perform reciprocating recording/playback operation by rotating and displacing a rotary head using the rotational force of an electric motor can be used to Even if a playback direction switching operation is performed while the motor rotation is stopped due to the playback operation of the tape recorder, the motor rotation operation is not performed, so that the continuous playback operation etc. is not affected. There is no
The present invention is optimal as an operation control circuit for a tape recorder incorporating two tape recorders.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the operation control circuit of the present invention. Explanation of main drawing numbers, 1...First motor, 2...Second motor, 6 ...First motor drive circuit, 10 ...
Second motor drive circuit, 11...First NOR circuit, 1
4...Second NOR circuit, 18...First switch, 1
9...2nd switch, 20, 21...selection switch, 26...recording switch, 27...recording/playback selection switch, 28...inverter, 29...th
3NOR circuit, 33...4th NOR circuit, 34...th
5NOR circuit, 37... Traveling direction switch.

Claims (1)

[Claims] 1. A first tape recorder having a playback function and a second tape recorder having a recording and playback function and capable of performing reciprocating recording and playback operations by rotationally displacing a rotary head using the rotational force of an electric motor are installed in the same cabinet. In the built-in cassette type tape recorder, the first switch is closed when the playback operation button provided on the first tape recorder is locked in the operating position, and the magnetic tape of the first tape recorder is closed. a first electric motor that drives the tape recorder to travel; a first electric motor drive circuit that becomes operational when the first switch is in the closed state and rotationally drives the first electric motor; and a playback circuit provided in the second tape recorder. The second switch is closed when the operation button is locked in the operating position, and the second switch is closed when the recording/playback direction of the second tape recorder is switched, and the switch remains closed until the direction switching operation is completed. a running direction changeover switch held in the second tape recorder, a second electric motor that drives the magnetic tape of the second tape recorder to run and rotationally displaces the rotary head during the switching operation of the running direction, and the second switch are in a closed state. a second motor drive circuit that is in operation when the time and running direction selector switch is in the closed state and rotates the second motor; a control circuit that prevents rotational driving of the second electric motor by closing the first switch when the second tape recorder is in a reproducing operation state; A cassette type tape recorder comprising a blocking circuit for blocking rotational driving operation of the second electric motor by closing the running direction changeover switch when the second tape recorder is in an operating state and a playback operation of the second tape recorder is being performed. Operation control circuit.