JPH0381212B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder equipped with two tape running mechanisms, and an object of the present invention is to provide a tape recorder which is equipped with two tape running mechanisms, and an object of the present invention is to provide a tape recorder having two tape running mechanisms. An object of the present invention is to provide a motor control circuit for a tape recorder capable of recording by a traveling mechanism.

Generally, in a tape recorder equipped with two tape running mechanisms, a playback signal from a first tape running mechanism is recorded by a second tape running mechanism to perform desired tape editing. When editing the tape, the program reproduced by the first tape running mechanism is arbitrarily rearranged by the second tape running mechanism. However, in conventional tape recorders, there is only an interlocking relationship between the first tape running mechanism and the second tape running mechanism to enable continuous performance during playback. The disadvantage was that it required a very troublesome operation to replace the tape, making it difficult to edit the tape.

The present invention eliminates such conventional drawbacks, and the present invention will be described below with reference to drawings of embodiments.

The drawing shows an embodiment of a motor control circuit for a tape recorder according to the present invention, and in the drawing, 1 is a first tape running mechanism, 2 is a second tape running mechanism, 3 is a track interval detector, It is configured to input a reproduction signal from a reproduction head (not shown) constituting the first tape running mechanism 1, and output a predetermined pulse signal when a silent section of the tape is detected. The first tape running mechanism 1 includes a motor _M1 for rotationally driving a capstan and a reel (not shown), and a transistor _TR1 and a resistor that constitute a drive circuit for the motor _M1 .
It has R ₁ and R ₂ . The second tape running mechanism 2 includes a motor _M2 for rotationally driving a capstan and a reel (not shown), and a transistor _TR8 and resistors _R9 and _R10 that constitute a drive circuit for the motor _M2 . There is. S _1-1 , S _1-2 ,
_S1-3 are switches that interlock with each other, and the first
The tape running mechanism 1 is turned on and off in response to the operation of a fast forward button or a rewind button. S _2-1 and S _2-2 are switches that operate in conjunction with each other, and are turned on and off in response to the operation of the fast forward button or rewind button of the second tape running mechanism 2. _S3 is a switch that supplies power +B to the motor _M1 , and is turned on and off in response to the operation of the playback button, fast forward button, and rewind button of the first tape running mechanism 1. . _S4 is a switch that supplies power +B to the motor _M2 , and is turned on and off in response to the operation of the play button, record button, fast forward button, and rewind button of the second tape running mechanism 2. It's summery. _S5 is a switch that is turned on and off in response to the operation of the playback button of the first tape running mechanism 1; _S6;
is a recording switch that is turned on and off in response to the operation of the recording button of the second tape running mechanism 2, S ₇ is a function switch for switching between tape, radio, and external input, S ₈ is a dubbing switch, S ₉
is a switch for selectively using the first and second tape running mechanisms 1 and 2, either alone or in conjunction with each other.

Resistor R ₁ that constitutes the drive circuit of the motor M ₁ above,
The connection point B of R ₂ is grounded via the transistor TR ₂ , and is connected to the switch S _1-1 , the diode D ₂ ,
It is connected to the pace of transistor TR ₆ through switch S _2-1 , resistor R ₃ and diode D ₃ . This transistor TR ₆ is inserted between the contact A of the resistors R ₉ and R ₁₀ constituting the drive circuit of the motor M _{2 and} the ground. The base of the transistor TR ₂ is connected to the connection point A via resistors R ₈ , R ₁₆ , switches S _1-2 and S _2-2 , and
A connection point between R ₈ and R ₁₆ is grounded via a transistor TR ₉ . The base of the transistor TR ₉ is connected to the base of a transistor TR ₁₀ inserted between the connection point of the resistor R ₃ and the diode D ₃ and the ground, and the bases of these transistors TR ₉ and TR ₁₀ are connected through the resistor R ₁₂ . connected to the Switch _S9 .

The transistor TR ₃ whose base is connected to the above connection point A via the resistor R ₇ has a resistor at its emitter.
It is connected to the voltage dividing point of R ₅ and R ₆ , and its collector is connected via the diode D ₁ to the connection point of the diode D ₂ and switch S _2-1 . The transistor TR ₄ whose base is connected to the above switch S ₉ is biased by a resistor R ₁₁ , and its emitter is connected to the above transistor through a diode D ₄ .
It is connected to the base of TR ₆ and to the power supply side of the motor M ₂ via a resistor R ₄ . The base of the transistor TR ₅ , which is connected complementary between the emitter and collector of the transistor TR ₄ , is connected to the voltage divided by the resistors R ₁₃ and R ₁₄ inserted between the connection point of the switch S _2-1 and the resistor R ₃ , and the ground. A transistor TR ₇ is inserted between the voltage dividing point and ground. The base of the transistor _TR7 is connected to the voltage dividing point of the resistors _R5 and _R6 via a resistor _R15 .

In this configuration, the switch _S7 is now in the tape position, the dubbing switch _S8 is in the on position, and the switch _S9 is in the interlocking position.When the record button and playback button of the second tape transport mechanism 2 are operated, the switch Since S ₄ and S ₆ are turned on, the transistor TR ₄
Power supply +B is added to the base of transistor TR ₄
is turned off, and the emitter of the transistor _TR4 rises to +B because the power supply +B is applied through the resistor _R4 . That is, here, the rise of the emitter of transistor TR ₄ to +B is due to the dubbing switch.
It functions to detect the dubbing mode when _S8 is turned on and the recording switch _S5 is turned on, and this detection of transistor _TR4 applies a bias to the base of transistor _TR6 through diode _D4 ,
Transistor _TR6 turns on and pulls the potential at connection point A down to ground potential. Therefore, the transistor _TR8 is turned off, no drive current flows to the motor _M2 , and the motor _M2 does not rotate.

That is, here, the transistor TR ₆ functions as a control transistor that puts the transistor TR ₈ in a non-operating state. With this operation, the record button and playback button of the second tape running mechanism 2 are locked, but the tape is not running.
The second tape running mechanism 2 is brought into a recording standby state.

Next, when the playback button of the first tape running mechanism 1 is operated, switches S ₃ and S ₅ are turned on.
A bias is applied to the base of the transistor TR ₁ to turn on the transistor TR ₁ , causing the motor M ₁ to rotate and enter the regeneration state. At this time, the connection B, that is, the collector potential V _B of the transistor TR ₂ is approximately V _B = R ₂ / R ₁ + R ₂ (B (V) - 0.65 (V)), and this potential V _B is equal to the voltage of the switch S _{1- 1} , diode D ₂ and switch S _2-1 to the base of transistor TR ₅ . Then, the transistor _TR5 turns on and pulls the emitter potential of the transistor _TR4 , that is, the potential at the connection point C, to the ground potential, making it almost zero potential. i.e. transistor TR ₅
The above transistor to detect dubbing mode
It works to eliminate the action of TR ₄ . Therefore, the transistor TR ₆ is turned off, the potential at the connection point A rises, a bias is applied to the base of the transistor TR ₈ , and the transistor TR ₈ is turned on. Therefore, the recording standby state of the second tape transport mechanism 2 is released, and the motor _M2 rotates to start tape transport. In this way the first
The playback signal from tape running mechanism 1 of
Recording is carried out by the tape running mechanism 2 of. It can be brought into a so-called dubbing state.

In this dubbing state, the transistors TR ₉ and TR ₁₀ are each turned on, so that the potential at the connection point B does not affect the transistor TR ₆ and the potential at the connection point A does not affect the transistor TR ₂ , respectively.

Next, when the fast forward or rewind button is operated in the playback state of the first tape running mechanism 1, both the fast forward or rewind button and the playback button become locked, and the first tape running mechanism 1 The state is brought to high-speed playback. At this time, in response to the operation of the fast forward button or rewind button, switches S _1-1 , S _1-2 , and S _1-3 each switch to fixed terminal 1.
Since the switch is switched to the side, power is supplied to the inter-song detector 3 through switches S _1-3 and S ₅ , and the inter-song detector 3 is switched to the
is operated. Then, current flows through the resistors R ₅ and R ₆ , and the divided voltage is applied to the transistor TR ₇ through the base resistor R ₁₅ , turning on the transistor TR ₇ . Therefore, the base voltage of the transistor TR ₅ is pulled down to approximately the ground potential by the transistor TR ₇ , so that the transistor TR ₅ is turned off. When the transistor TR ₅ is turned off, the collector potential of the transistor TR ₄ , that is, the connection point C
rises to the potential of the power supply +B, so the potential of its connection point C is applied to the base of the transistor TR ₆ through the diode D ₄ , and the potential of the transistor TR ₆
is turned on to draw the potential at connection point A to ground potential. Therefore, the transistor _TR8 is turned off, and no drive current flows to the motor _M2 , so that the motor _M2 stops rotating. In this way, the second tape transport mechanism 2 is brought back to the recording standby state when the first tape transport mechanism 1 is in the high speed playback state.

Next, in the high-speed playback state of the first tape running mechanism 1, when a silent section of the tape is detected by the inter-track detector 3, the lock state of the fast forward button or rewind button is released based on the detection signal, and playback is performed. status will be restored. Then, switch S _1-1 ,
Since S _1-2 and S _1-3 are switched to the fixed terminal 2 side,
The base potential of the transistor _TR7 drops to zero potential, and the transistor _TR7 is turned off. Therefore,
Transistor _TR5 is turned on to pull the emitter potential of transistor _TR4 , that is, the potential at connection point C, to ground potential, transistor _TR6 is turned off, and transistor _TR8 is turned on. Therefore, the motor _M2 starts rotating and the dubbing state is entered again.

Note that the release operation of the fast forward or rewind button from the high-speed playback state based on the detection signal from the inter-track detector 3 can be performed, for example, by driving the release mechanism of the fast forward or rewind button with a plunger, or by driving the release mechanism of the fast forward or rewind button with a plunger. It can be started with a plunger and driven using the rotational force of a motor.

As described above, according to the present invention, the first motor for the first tape running mechanism, the first motor drive circuit, the second motor for the second tape running mechanism, and the second motor for the first tape running mechanism, a motor drive circuit; a dubbing mode detection circuit that detects the dubbing mode when both the dubbing switch and the recording switch are selected; and a dubbing mode detection circuit that detects the dubbing mode when the dubbing switch and the recording switch are both selected; Therefore, the first control means puts the second motor drive circuit into a non-operating state in a recording standby state, and the first control means puts the first motor drive circuit into an operating state when the first tape running mechanism is operated for reproduction. Interlockingly, a second control means cancels the recording standby state of the first control means and drives the second motor drive circuit to enter the recording state despite the output of the dubbing mode detection circuit. Only when both the dubbing switch and the recording switch are selected and the dubbing detection circuit outputs a dubbing mode selection output, even if the second tape running mechanism is operated for recording, the first control means is not activated. The recording standby state of the second motor drive circuit is released when the first tape running mechanism is operated to playback, and the dubbing recording state can be set.
The cancellation is performed by canceling the function of the first control means despite the output of the dubbing mode detection circuit by the second control means in conjunction with the operating state of the first motor drive circuit. It is something that can be done. Moreover, in the dubbing recording state, although the function of the first control means is released, the dubbing mode detection circuit continues to detect the dubbing mode, and therefore the playback state of the first tape running mechanism is changed. When the first motor drive circuit is finished and the first motor is stopped, the first control means can be operated again to put the second motor drive circuit into a non-operating state. Also, when dubbing mode is not selected,
Since there is no output from the dubbing mode detection circuit and the first control circuit does not operate, the second motor drive circuit operates independently. In other words, by the very simple operation of selecting or deselecting a dubbing mode using a dubbing mode switch, it is possible to select between a dubbing recording state and an independent recording state through the functions of each circuit and control means, which is extremely effective. This is a motor control circuit for a tape recorder.

[Brief explanation of drawings]

The drawing is a circuit connection diagram showing an embodiment of a motor control circuit for a tape recorder according to the present invention. DESCRIPTION OF SYMBOLS 1...First tape running mechanism, 2...Second tape running mechanism, _M1 ...First motor, _M2 ...Second motor, _S5 ...Recording switch,
_S8 ...dubbing switch, _TR1 ...transistor forming the first motor drive circuit, _TR4 ...transistor forming the dubbing mode detection circuit,
TR ₅ ...Transistor forming the second control means, TR ₆ ...Transistor forming the first control means, TR ₈ ...Transistor forming the second motor drive circuit.

Claims (1)

[Scope of Claims] 1. A first motor for a first tape running mechanism capable of creating a playback state by operating a playback button, a drive circuit for the first motor, and a recording state by operating a record button. a second motor for a second tape running mechanism capable of producing a second tape drive mechanism, a drive circuit for the second motor, and a dubbing mode detection circuit that detects a dubbing mode when both a dubbing switch and a recording switch are selected. and a first control means that sets the second motor drive circuit to a non-operating state in a recording standby state by the output of the dubbing mode detection circuit even if the second tape running mechanism is operated for recording; Although the dubbing mode detection circuit outputs an output in conjunction with the operating state of the first motor drive circuit when the first tape running mechanism is operated for reproduction, the first control means is in the recording standby state. 1. A motor control circuit for a tape recorder, comprising: second control means for releasing the second motor drive circuit and setting the second motor drive circuit to a recording state.