JPS6190332A - Action control circuit for tape recorder - Google Patents

Abstract

PURPOSE:To avoid an unnecessary travelling of magnetic tape, by providing a control circuit to maintain the electric motor at high speed when the device is in high speed dubbing operation, and then switching the motor to low speed by a reverse action of the circuit when a stop operation is made. CONSTITUTION:There are provided a sound recording/reproducing switch SW1 which is operated at the 2nd tape recorder, a dubbing switch SW2 to switch to dubbing operation, and a speed control switch SW3 to switch to high speed dubbing operation. When a stop operation is made at the tape recorder of reproduction side, S21 is closed, and motors 13, 14 are switched to low speed by a control circuit 4, preventing an unnecessary travelling of the magnetic tape. Also when the stop operation is made at the tape recorder of sound recording side, S23 is closed, and the motors 13, 14 are changed to low speed, again preventing the unnecessary travelling of the sound recording tape. Thus, the load applied to the magnetic tape is minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application The present invention provides a first tape recorder with a playback function and a second tape recorder with a recording and playback function built into the same cabinet. This invention relates to an operation control circuit for a tape recorder.

(b) Prior Art Recently, so-called double tape recorders, in which two tape recorders are built into the same cabinet, have become popular. It has a function of recording with a recorder, that is, a function called dubbing, and a technique for performing such a dubbing operation is disclosed, for example, in Japanese Patent Publication No. 57-47494.

Furthermore, in order to shorten the operation time when performing such a dubbing operation, a tape recorder that runs the magnetic tape at twice the normal speed, for example, has been made into a component. For example, Utsukai Showa 58-1
There is one disclosed in Publication No. 4229.

(c) Problems to be Solved by the Invention The five functions that perform dubbing operations by increasing the running speed of the magnetic tape are called high-speed dubbing functions. When a stop operation is performed, the running speed of the magnetic tape is faster than the normal speed, causing problems in that the magnetic tape runs wastefully and the load applied to the magnetic tape increases. The present invention aims to provide an operation control circuit that solves this problem.

B) Means for Solving the Problems The present invention provides a dubbing switch that is closed during dubbing operation, a speed changeover switch that is closed during high-speed dubbing operation, and a speed changeover switch that is opened when the silk tape recorder is in the playback state. a first switch that is opened when the second tape recorder is in a recording or playback state and closed during a pause operation; and a second switch that is opened when the second tape recorder is in a recording or playback state and closed when a pause operation is performed; A control circuit that outputs a switching signal for switching the rotational speed of the motor to the high speed state when the switches are in the dubbing side and the high speed side, respectively, and the first switch and the second switch are both in the open state. It is configured.

(E) Function The present invention provides a control circuit that outputs a switching signal to set the motor to a high speed state when in a high speed dubbing operation state, and when a temporary stop operation of the first tape recorder or the second tape recorder is performed. The rotational speed of the electric motor is switched to a low speed state by the reversing operation of the control circuit.

(f) Embodiment The illustrated circuit is an embodiment of the operation control circuit of the present invention. In the figure, (1) is a recording/playback selector switch that is switched by the recording operation of the second tape recorder, which connects the common terminal (la) connected to the power supply, the playback side terminal (1p), and the recording side terminal (1r). We are prepared. (2
) is a dubbing switch that is switched during dubbing operation, and the recording side terminal (1) of the recording/playback selector switch (1)
r), and a first terminal (2b) connected to the common terminal (2a) during non-dubbing operation.
) and a second terminal (2c) connected to the common terminal (2a) during dubbing operation. (3) is a speed changeover switch that is switched during high-speed dubbing operation, and includes a common terminal (3a), a low-speed side terminal (3b), and a high-speed side terminal connected to the second terminal (2c) of the dubbing switch (2). (3c). (4) is a control circuit consisting of a first NAND, D circuit (5) and a second NAND circuit (6), and the first input terminal (5) of the first NAND circuit (5) is
a) is connected to the power supply via a resistor (power), and the 42 input terminal (5b) is connected to the speed selector switch (
3) is connected to the high speed 111+1 terminal (3C).

(9) The pace is connected to the second NAND through the resistance α0)
This is a display transistor connected to the output terminal of the circuit (6) and whose emitter is grounded, and whose collector is connected to the power source via the light emitting diode aυ and the resistor side. Q31 is the first electric motor α that drives the magnetic tape attached to the first tape recorder.
The 21st to drive the magnetic tape attached to the second tape recorder! The motor Q51 rotates the first electric motor Q3 and the second electric motor α and controls the speed thereof! This is a motor drive circuit 6, and is configured to rotate the first electric motor Q31 and the second electric motor circle at low speed and high speed, respectively.

Reference numeral 06) is a switching transistor whose emitter is grounded and whose base is connected to the output terminal of the second NAND circuit (6) via a resistor a, and when in a conductive state, the switching transistor When the first tape recorder is in the reproduction operation state, the signal reproduced by the first tape recorder trap is applied, and at the same time the second tape recorder starts the reproduction operation. When in the state, the input terminal to which the signal reproduced by the second tape recorder is applied; This is an output terminal to which the signal amplified by the circuit (11) is output, and the signal output to the output terminal (A) is configured to be applied to the input terminal of an amplifier having a large output.Qυ is This is an il switch that is opened when the first tape recorder enters the playback mode and closed when the pause operation is performed.
It includes an H1 terminal (21a) connected to the first input terminal (5a) of the INAND circuit (5) and a second terminal (21b) grounded.

(231 is a second switch that is opened when the second tape recorder enters the playback operation state and recording operation state, and is closed when the pause operation is performed, and is connected to the first NAND circuit (5 ) and a second terminal (23b) connected to the ground.

The operation of 251 is controlled by the first switch Cυ (the base is connected to the first terminal (21a) of the first switch Cυ via a resistor (26) and a diode (5), and the emitter is connected to the first terminal (21a) of the first switch Cυ). The first transistor is connected to the power supply, the bias resistor is connected between the emitter and base of the first transistor (25I), and the connection point between the resistor (25) and the diode (27) is the ground. This is a capacitor connected between the resistor (T) and the function of forming a time constant circuit. 23a) and whose base is connected to the playback side terminal (1p) of the recording/playback switch (1) via the resistor C12+.
A third transistor (g) whose base is connected to the collector of the m 2 transistor group through a resistor (b) and whose emitter is connected to the collector of the first transistor 〇51.
is the bias resistor connected between the emitter and base of the third transistor can, (g) is iVJ, m 2
) This is a capacitor connected between the collector of the Lansister circle and the ground, and has the function of forming a time constant circuit together with the resistor c34) (3η is the collector connected to the output terminal reserve). It is a muting transistor whose emitter is grounded, and whose base is connected to the collector of the third transistor ctl via a resistor and a diode. ) is a miniting control circuit that controls the operation of the UIJ, and its emitter is connected to the power supply, and its collector is connected to the base of the muting transistor (3717) via a diode (41) and a resistor (3717). The first
A second rlJl (111) whose collector is connected to the base via a resistor (44) and whose emitter is grounded in order to control the operation of the control transistor (421, 'A'r) Run sister (44), said control circuit (second N forming the force)
When an I-1 (high) level signal is output to the output terminal of the AND circuit (6), the second control transistor (44)
) is supplied with a base current that makes it conductive for a predetermined period of time, and the output signal of the second NAND circuit (6) is at an L (lower) level than the H level. When reversed, a base current is caused to flow through the first control transistor (421) to conduct for a predetermined period of time, and the capacitor (421) is turned on.
8 and a resistor (4!+1) and a bias resistor 6υ.
The time constant is set to be slightly longer than the time required for the running speed of the magnetic tape to stabilize at the predetermined high and low speeds when the running speed of the magnetic tape is switched from low speed to high speed and from high speed to low speed. are set respectively.

The present invention is constructed as described above, and its operation will be explained next.

In the state shown, the control circuit (the second N
Since an L level signal is output to the output terminal of the AND circuit (6), both the display transistor (9) and the switching transistor are in a non-conducting state. Also, since the first switch Qv and the second switch are in the closed state and the bias current is supplied to the pace of the second transistor G30+ through the recording/playback changeover switch (1), the PJl transistor 125) and the second Transistor (30) and third transistor □□□)
is in a conducting state. Therefore, a bias current flows from the collector of the third transistor α to the muting transistor T371 through the diode and the resistor (■, and the muting transistor C37).
is in a conductive state.Therefore, the noise signal etc. amplified by the amplifier circuit (1! When the magnetic tape drive mechanism enters the state for performing the playback operation, the first
Switch (2I) is opened. The first switch (21
Even if 1 is opened, the 1st NAN that constitutes the control circuit (迭)
The levels of the output signals of the D circuit (5) and the second NAND circuit (6) are never inverted, and the display transistor (
9) and the switching transistor (16) are in a non-conducting state. Therefore, the motor drive circuit of the first turtle motor U is 0! li
It is rotated at a slow speed of pheasant due to i.

When the first switch +211 is opened, the first transistor (25) is inverted to a non-conducting state after a period of time set by a time constant circuit consisting of a resistor 061 and a capacitor (two). ) inverts to the non-4]IB state, the third transistor (3:
Since the current supply to 9 is cut off, the third transistor (
The pace 'KrM' of the muting transistor C37) supplied from the current collector is cut off, and the muting transistor C37) becomes in a non-quadruple state.

Therefore, the reproduced signal reproduced by the first tape recorder and applied to the input terminal (181) is amplified by the amplifier circuit α and then output to the output terminal (2 (j). Therefore,
The user can listen to the reproduced signal from the first tape recorder by the amplifying operation of the amplifier to which the signal from the output terminal is applied and the sound emitting operation of the speaker connected to the amplifier.

If a temporary stop operation is performed in such a state, one of the magnetic tape drive mechanisms is put into a temporary stop state, and the first Swiss Sochi I 211, which was in an open state, is closed.

When the first switch Cυ is closed, the first transistor (25) is biased and immediately reversed to a conductive state, so that a bias current is supplied from the collector of the third transistor to the pace of the muting transistor (37). . Therefore, when a pause operation is performed, the muting transistor (37) immediately changes to the 4-channel state, so the noise generated due to the pause is transferred to the output terminal +2 (
11 will not be output. Furthermore, when the temporary stop operation is canceled, the first switch (2υ) is opened and the first transistor (29) is reversed to the non-conducting state, and the muting transistor G force is reversed to the non-conducting state. Since the operation is delayed by a predetermined period of time, the harsh sound caused by the start of the magnetic tape running is not output to the output terminal (201).Then, when the first tape recorder is in the playback mode and at the cape, the stop operation is performed. Then, the ringer material is returned to the stop state 7ip, and the first switch (
21+ is closed and the muting transistor ((
Since the force is reversed to a conductive state, noise associated with stopping is not output to the output terminal (20). Further, when the first tape recorder is fast forwarded or rewinded, the drive mechanism enters a state for performing each operation, and each operation is performed, but since the first switch 111 is in a closed state, the muting transistor is 07) is in a conductive state, and no noise signal is output to the output terminal (2).

As described above, each operation of the first tape recorder is performed, and next, the operation of the second tape recorder will be explained. When the second tape recorder is operated for reproduction, the magnetic tape drive mechanism is brought into a state for reproduction operation, and the second switch in the open position is opened. The second
Even if the switch is opened, the control circuit (the first
The levels of the output signals of the NAND circuit (5) and the second NAND circuit (6) are not inverted, and the display transistor (9) and the switching transistor 〇〇 are in a non-conducting state. Therefore, the second electric motor 04) is the motor drive circuit (1
5i, it is rotated at a predetermined low speed. When the second switch (231) is opened, the second transistor Q is inverted to a non-conducting state, so the third
The bias of the third transistor is reduced to F, but after the time set by the time constant circuit consisting of the resistor C and the capacitor [161] has elapsed, the third transistor is reversed to a non-conducting state. The third transistor is in a non-conducting state.
When it is reversed to E, the base current of the meeting transistor 37) is cut off, so that the meeting transistor R becomes non-conductive. Therefore, the reproduced signal reproduced by the second tape recorder and applied to the input terminal t181 is amplified by the amplifier circuit (I9) and then output to the output terminal.

Therefore, as mentioned above, the user can receive the signal reproduced by the second tape recorder all day long. When a temporary stop operation is performed in such a state, the magnetic tape drive mechanism enters the temporary stop state, and the second switch (231) which was in the open state is closed. When the transistor is closed, a bias current is supplied to the pace of the second transistor and the third transistor (the muting transistor 67 from the collector of the third transistor because the transistor is biased and immediately reversed to the conductive state). Therefore, when a pause operation is performed, the muting transistor C3?) is immediately reversed to a conductive state, so the noise generated due to the pause F is not output to the output terminal reserve.Also, the pause operation is canceled. Then, the second switch (C) is opened, and the second transistor (c'+o+a) and the third transistor (G) are opened.
As the muting transistor (37) is reversed to a non-conductive state, the muting transistor (37) is reversed to a non-conductive state, but since this reversal operation is delayed by a predetermined time, the harsh sound caused by the start of running of the magnetic tape is generated. There is no output to the output terminal (201).If the stop operation is performed while the second tape recorder is in the playback state, the drive mechanism is returned to the stop state and the second switch is closed to mute. Since the transistor C37) is inverted to a conductive state, noise accompanying the stop is not output to the output terminal (201).

Also, when fast forwarding or rewinding the second tape recorder, the side of the tail unit becomes ready for each operation, and each operation is performed, but since the second switch □□□ is in the closed state, muting is disabled. The transistor (371) is in a conductive state, and no miscellaneous signals are output to the output terminal A.If the second tape recorder is not operated, the recording/playback selector switch (1) will change to the shape shown in the diagram. At the same time, the drive mechanism is switched to the recording side, which is the opposite side, and the recording operation is started, but since the switching transistor (16) is in a non-conducting state, the second motor circle is at a low speed. It will be rotated at a speed of .

Furthermore, when the recording/playback selector switch (1) is switched to the recording side, the bias to the base of the second transistor (7) is cut off, so the transistor 601 becomes non-conductive regardless of the opening/closing operation of the second switch t231. Therefore, when the second tape recorder is in the recording state, the muting transistor C3n is in a non-conducting state, and the recorded signal, that is, the monitor signal, is outputted to the output terminal t20.

Since the muting transistor C37) is held in its normal state for a predetermined period of time after the recording/playback switch (1) is switched to the recording side, the noise signal accompanying the switching is output to the output terminal t2U. There are no words to be said. Also, when the recording operation state is canceled by the stop operation, the recording/playback selector switch (1) is switched to the playback side and the second switch (
Since the muting transistor (37) is immediately reversed to the conductive state with the closing operation (c), the noise signal accompanying the switching is not output to the output terminal (3).

As described above, the operation is performed when the first tape recorder and the second tape recorder are used alone.Next, dubbing is performed in which the signal reproduced by the first tape recorder is recorded by the second tape recorder. The operation will be explained. First, a low-speed dubbing operation will be explained. This operation is performed by switching the dubbing switch (2) to the dubbing side, which is opposite to the state shown in the figure, and placing the first tape recorder and the second tape recorder in the playback operation state and the recording operation state, respectively. When the ping switch (2) is switched to the dubbing side, the signal reproduced by the first tape recorder is guided to the recording circuit of the second tape recorder by switching the dubbing switch (not shown). When you operate the first tape recorder and record the second tape recorder, the first switch C! υ and second switch (
24 is opened and an H level signal is input to the first input terminal (5a) of the first NAND circuit (5), but an L level signal is input to the second input terminal (5b). Therefore, the output of the first NAND circuit (5) is at H level, and the output of the second NAND circuit (6) to which the signal is input is at L level. Therefore, the switching transistor (1
6) is in a non-conducting state, and the first electric motor 03 and the second electric motor α are rotationally driven by the motor drive circuit (151) at a predetermined low speed. The playback signal from the first tape recorder is
The recording circuit of the second tape recorder exclusively uses the magnetic tape KfJ which is running at a predetermined low speed. The dubbing operation is performed in this way, but when the dubbing operation is in progress, the muting transistor Gη is in a non-conducting state, so the reproduction signal reproduced by the first tape recorder is amplified by the amplifier circuit It is output to the output terminal ■ as a rear monitor signal.

Although the dubbing operation at low speed is performed as described above, the dubbing operation at high speed will be explained next. Such high-speed dubbing operation is performed by using a speed changeover switch (3) in addition to the above-mentioned dubbing operation.

Umazu dubbing switch (2) and speed changeover switch (3) which are performed by switching to the opposite side of the state
A case will be described in which the playback and recording operations of the first tape recorder are performed when the dubbing side and high-speed 14++ VC are switched, respectively. When such an operation is performed, the first switch (211) and the second switch (c) are opened, and the recording/playback selector switch (1) is switched to the recording side, which is the opposite side from the state shown in the figure. When the signal is input to the first input terminal (5a) of the first NAND circuit (5), an H level signal is applied to the first input terminal (5a) of the first NAND circuit (5), and the second input terminal (5b) is connected to the K recording/playback switch (1) and the dubbing switch (2). ), an H level signal is applied through the speed selector switch (3) and the resistor (8), so an L level signal is output to the output terminal of the fil NAND circuit (5). When an L level signal is output to the output terminal of the second NAND circuit (6), an H level signal is output to the output terminal of the second NAND circuit (6) to which the signal is input.
When the output signal of the ND circuit (6) becomes H level, the display transistor (9) and the switching transistor 61 to which the signal is applied to the base become conductive. When the display transistor (9) reaches the 6-channel state, the light emitting diode Uυ connected to its collector as a load is turned on, indicating that the tape recorder is in a high-speed dubbing operation state. When the switching transistor (161) becomes conductive, the rotational speed of the first motor Q31 and the 82 car #I machine αa by the motor drive circuit a is switched, and the rotational speed of the first motor Q31 and the 82 car #I machine αa is
) is driven at a high predetermined speed.

When an H level signal is output from the second NAND circuit (6), a bias current flows to the base of the iA2 control transistor (44) for a predetermined time through the first time constant circuit. becomes conductive. When the second suppressing transistor 041 becomes conductive, the first control transistor (4 transistors) controlled by the second control transistor (44) become conductive, so during that time the first control transistor 142 A bias current is supplied from the collector of the control circuit (second transistor C37) through the diode (41) and the resistor C to the base of the mining transistor C37.
When an H level signal is output to the output terminal of the NAND circuit (6), the muting transistor c3η becomes conductive for a predetermined period of time, so that a noise signal accompanying the start of high-speed dubbing operation is output to the output terminal ■. There isn't. When such an operation is performed, the tape recorder enters a high-speed dubbing operation state in which the signal reproduced at high speed by the first tape recorder is recorded at high speed by the second tape recorder. If a stop operation is performed on the first tape recorder and the second tape recorder while the tape recorder is in such a high-speed dubbing operation state, each tape recorder is switched to the stop state, but the stop operation of any one of the 10,000 tape recorders is not performed. When the control circuit (4) is
The output signal of the NAND circuit (6) is inverted from H level to L level. The output signal of the second NAND circuit (6) is L
When the level is reached, the base current of the first control transistor (421) flows through the second time constant circuit, and the base current of the first control transistor (421) flows through the second time constant circuit.
11) Run sister (4 is in a conductive state for a predetermined period of time.

When the first control transistor (42) becomes conductive, a bias current flows to the base of the muting transistor c>7 and the muting transistor c3D becomes conductive. When the output signal of the circuit (6) is inverted from the H level to the L level, the muting transistor C3 becomes conductive for a predetermined period of time, so the noise signal generated due to the stop operation is output to the output terminal □□□. Never.

As described above, switching from the stopped operating state to the high-speed dubbing operating state and switching from the high-speed dubbing operating state to the stopped operating state are performed, but next time when in the low-speed dubbing operating state, the speed selector switch 13) is set to the low speed. The operation when switching from the high speed side to the high speed side or from the high speed side to the low speed side will be explained. When the dubbing operation is performed at a low speed, the recording/playback selector switch (1) and the dubbing switch (2) are on the recording side and the dubbing operation side, which are opposite to the state shown in the diagram, as described above, and the first switch (2υ
and the second switch (c) is in an open state. In such a state, the first input terminal (5) of the first NAND circuit (5)
a) K is in a state where an H level signal is applied, but since the speed selector switch (3) is on the low speed side as shown in the figure, the second
An L level signal is applied to the input terminal (5b). Therefore, an H level signal is output to the output terminal of the first NAND circuit (5), and an L level signal is output to the output terminal of the 12 NAND circuit (6) to which this signal is input. When the tape recorder is in such a low speed dubbing operation state, when the speed selector switch (3) is switched to the high speed side opposite to the state shown in the figure, the second input between the first NAND circuit is passed through the speed selector switch (3). A KH level signal is applied to terminal (5b).

As a result, the output signal of the first NAND circuit (5) becomes L level, and this signal is input. A2NAND2NAN
The output signal of D becomes H level. When the output signal of the second NAND circuit (6) becomes H level, the display transistor (9) becomes conductive and the light emitting diode 0υ lights up, and the switching transistor (l tl & drive circuit (1~ by 1''1
The rotational speed of the first motor (+31) and the second motor α is switched from low speed to high speed. By switching the trap speed changeover switch (3) to the high speed side, the tape recorder enters the high speed dubbing operation state. However, when an H level signal is output to the output terminal of the second NAND circuit (6) due to such switching operation, the muting control circuit +4g
Since the muting transistor c3D is turned on for a predetermined period of time by connecting the second control transistor (4a) and the first control transistor (4a to 2a), which make up the circuit 1, the muting transistor c3D becomes conductive for a predetermined period of time.
1"S sound will not be output to the output terminal (2tj). In this way, when the speed selector switch (3) is switched from the low speed side to the crystal speed side trap while in the dubbing operation state, the operation will not be performed. Next, we will explain the operation when switching from the high speed side to the low speed side.When the speed selector switch 13) is switched from the high speed side to the low speed side while in the high speed dubbing operation state mentioned above, the first NAND circuit (5) The signal input to the second input terminal (5b) is lower than the I] level to the L level%r 11[-2)l'l j-'')N1'+'l
',11,'(fil I N XN 1)llllk
'5(', +l+') Ill 狽■ becomes H level, and the output of the second NAND circuit (6) to which this signal is input becomes L level. When the output of the second NAND circuit (6) becomes L level, the display transistor (9) and the switching transistor (16) become non-conductive, the light emitting diode (old) becomes non-lit, and the first motor 1131 and the switching transistor (16) become non-conductive. The second electric motor (+41) enters the low-speed rotation state.In this way, by switching the speed selector switch (3) to the low-speed side, the tape recorder enters the low-speed dubbing operation state. When an L level signal is output to the output terminal of the 2NAND circuit (6), the first control transistor (muting transistor C37, which constitutes the meeting control circuit) becomes conductive for a predetermined period of time due to conduction of 421. The harsh sound reproduced as the t-line speed of the magnetic tape changes is not output to the output terminal f2 (HC).

As described above, when the speed selector switch (3) is switched from the low speed side to the high speed side or from the high speed side to the low speed side while in the dubbing operation state, the operation is performed, but when the next high speed dubbing operation is performed, The operation when the pause operation is performed will be explained.

When the tape recorder is in a high-speed dubbing state, if you perform a pause operation on the first tape recorder, which is the playback side, the drive mechanism enters the pause state and the first
Switch CD is closed. When the first switch (2υ) is closed, the first input terminal (
Since the L level signal is input to 5a), the first NA
The output of the ND circuit (5) becomes H level, and the second NAND
The output signal of the circuit (6) becomes L level. The second NAN
When the output of D circuit (6) becomes L level, 41! IJ
t, the rotational speed of the motor (131 and the second electric motor θ) is switched from high speed to low speed as described above, and the muting control circuit (muting transistor C37 due to the function of 43) becomes conductive for a predetermined period of time, so that the rotation speed is temporarily turned on. The noise signal associated with the stop operation is not output to the output terminal (20+).If you perform a pause operation on the tape recorder 1 while it is in the high-speed dubbing operation state, the 11'3° motor ( 13) and the second electric motor (14
) can be switched from a high-speed state to a low-speed state, so it is possible to suppress the dull running of the magnetic tape as much as possible, and when the first cheap recorder is temporarily stopped, the second tape recorder, which is the recording side, is also linked. This is of great advantage when implemented in a tape recorder configured to be switched to a pause state.

In this way, when the tape recorder is in the high-speed dubbing operation state, the operation when the first tape recorder is paused is performed, but then the second tape recorder on the recording side
The operation when the tape recorder is temporarily stopped will be explained. If you perform a pause operation on the second tape recorder, which is on the 8-tone side, while in high-speed dubbing mode, the drive mechanism enters the pause state and the second tape recorder
Switch θ is closed. When the second switch t231 is opened, the first input terminal (5) of the nest INAND circuit (5) is opened.
Since the L level signal is input to a), the first NAND
The output of the circuit (5) becomes H level, and the output of the second NAND circuit (6) becomes L level. The second NAND circuit
! 6f6) becomes L level, the first electric motor +1 (1
As mentioned above, the rotational speed of the 31st and 24th actuators (141) is switched from a high speed to a low speed iK, and the muting transistor (37) remains in the 4th state for a predetermined period of time due to the action of the muting control circuit (40). Therefore, the output terminal +21J K signal is not output during that time.Therefore, when the pause operation of the second tape recorder is performed and the second tape recorder is switched to the pause state, y': of the first tape recorder. Even if the playback operation is performed at a low speed, the harsh sound caused by the change in running speed will not be output to the output terminal (2) and will not cause discomfort to the user.Furthermore, the second tape recorder When the temporary stop operation is performed, the rotational speed of the second electric motor I is switched from the high speed state to the low speed state, so that unnecessary running of the recording tape is minimized. Since the magnetic tape is switched to a low speed state, the load applied to the magnetic tape can be minimized.

(G) Effects of the Invention The operation control circuit of the present invention switches the rotational speed of the motor from a high speed state to a low speed state when the first tape recorder or the second tape recorder is temporarily stopped while in the high speed dubbing state. This has the advantage that not only can unnecessary running of the magnetic tape on the side where the temporary stop operation has been performed be suppressed as much as possible, but also the load applied to the magnetic tape can be reduced. Also, if you perform a pause operation on the second tape recorder, which is the tape recorder on the recording side, while in high-speed dubbing mode, the playback operation on the first tape recorder, which is the tape recorder on the playback side, will change to the slow speed. Therefore, the high-speed dubbing operation is interrupted and the playback reliability of the first tape recorder is checked. It is something that

[Brief explanation of drawings]

The illustrated circuit is one embodiment of the operation control circuit of the present invention. Explanation of main figure numbers (1)...Recording/playback selector switch, (2)...Dubbing switch, (3)...Speed selector switch,
f4)...Control circuit, (5)...First NAND circuit, (6)...Second NAND circuit, (9)...
・Display transistor, (131...1st motor, ■...2nd motor, (15+...' electric gi
Actual circuit, σe...switching transistor, ■・
...Amplification circuit, (21)...First switch, t2
31...Second switch, (c)...First transistor, GOI-...Second transistor, a threat...
・Third transistor, C37)...muting transistor, (4!I...muting i
tf control circuit, (421...first control transistor, (Foundation)...second control transistor, 0n.
...First time constant circuit, Q...Second time constant circuit.

Claims (1)

[Claims] (1) A first tape recorder having at least a playback function and a second tape recorder having a recording and playback function are built into the same cabinet, and the signal played by the first tape recorder is transferred to a second tape recorder. In a tape recorder equipped with a dubbing function for recording on the recorder, there is a dubbing switch that is switched during dubbing operation, a speed selector switch that is switched during high-speed dubbing operation, and a pause switch that is released and paused when the first tape recorder is in the playback state. A first switch that is closed when the tape recorder is in operation, a second switch that is open when the second tape recorder is in the recording and playback state, and closed when the second tape recorder is in the pause operation; It is in a state where it has been switched to the side and high speed side,
and a control circuit that outputs a switching signal for switching the rotational speed of the electric motor to a high speed state when both the first switch and the second switch are in an open state, and when the first switch and the second switch are in the high speed dubbing operation state, An operation control circuit for a tape recorder, characterized in that the rotational speed of the electric motor is switched to a low speed state when a temporary stop operation of the tape recorder is performed.