JPS60175221A - Synchro-dubbing circuit of tape recorder - Google Patents

Abstract

PURPOSE:To improve the operability for dubbing by using a switch used by a muting circuit to keep a tape deck of the recording side in a recording mode until a slide base reaches its working position. CONSTITUTION:When the synchro-dubbing is carried out, the 2nd reproduction switch 14 and a sound recording switch 15 are turned on after setting a cassette tape. Then the 1st reproduction switch 10 is turned on after loading a tape to be dubbed to the 1st deck. Thus the 1st motor 10 is revolved to start reproduction of the tape cassette. While a switch 19 is turned off and therefore the power supply voltage is delayed by a delay circuit 20. This delayed voltage is applied to the base of a muting transistor 21 to turn on this transistor. Thus the muting signals so far applied to the base of a control transistor 16 are extinguished. Then the 1st control transistor 13 is turned on to drive the 2nd motor 12. Thus the sound signal reproduced by the 1st tape deck is applied as it is to the 2nd tape deck and recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a synchro dubbing circuit for a tape recorder that allows synchro dubbing to be performed without any trouble.

(B) Prior Art Traditionally, a so-called double-decker tape recorder, in which two tape decks are mounted on one tape recorder and an audio signal such as music played on one tape deck is recorded on the other tape deck, has been developed, for example, by 50-9930
It is publicly known as described in Publication No. 2. In such a double deck tape recorder, if the tape deck on the recording side is placed in a recording standby state in advance and then the other tape deck is placed in a playback state, the tape deck in the recording standby state automatically starts recording, and one of the tape decks in the recording standby state automatically starts recording. There is a need for synchronized dubbing, in which the audio signal played from one tape is recorded on another. That's how. Figure 1 was designed for synchronized dubbing. First, the play button and record button on the second tape deck for recording are turned on. Then, the second switch (1) and the third switch (2), which are respectively linked to the play button and the record button, which are connected in series, are turned on. However, since the first transistor (3) is turned on at this time, the second transistor (4) is turned off, the second motor (5) is not rotated, and the second tape deck is placed in a recording standby state.

Next, when you press the playback button on the first tape deck to be played, the first switch (6) is turned on, rotates the first motor (7), and puts it into the playback state.
Since the transistor (3) is turned off and the second transistor (4) is turned on, the second motor (5) also rotates at the same time, putting the second tape deck in the recording state and transmitting the audio signal played by the first tape deck to the second tape deck. I try to record with . However, since the first switch (6) is turned on even during fast forwarding or early spring return, if the first tape deck is fast forwarded while the second tape deck is in the recording standby state, the second tape deck will start recording. Also, at the start of the synchronized dubbing, the first motor (7) and the second motor (7)
Since the motor (5) was started at the same time, the starting current was large and the load on the power supply varied greatly, causing noise. Furthermore, even when the first tape deck is paused in the playback state, the first switch (6) remains on, so the second tape deck continues to record, which causes the first tape deck, which is commonly used, to be stopped from the playback state. When paused, recording on the second tape deck is stopped, and when the pause on the first tape deck is released, recording on the second tape deck cannot be resumed.

(/1 Purpose of the Invention The present invention is used to prevent noise from being generated until the slide base is in the operating position in a device that uses the rotational force of a motor to move a slide base, etc. to a playback state. To provide a synchro dubbing circuit for a tape recorder which eliminates the above-mentioned drawbacks by putting a tape deck on the recording side into a recording state by using an on/off switch used in a miniting circuit.

B) Structure of the Invention The present invention provides a system for sliding a slide base by the rotational force of a first motor on the side of a first tape deck used for playback, and turning on/on an open/close switch by the slide base. A first transistor for control is connected to the second motor, and the first transistor for control is controlled by a recording switch of the second tape deck and a second transistor for control controlled by the opening/closing switch, so that the first tape deck is not playing. In this state, even if the recording switch is turned on, the second motor is not rotated, and when the first tape deck is put into the playback state and the opening/closing switch is turned on or off differently than before, the second motor for control is turned on. ) The present invention relates to a synchro dubbing circuit for a tape recorder, which controls a first control transistor, thereby also controlling a first control transistor, rotates a second motor, and puts a second tape deck in a recording state.

(E) Example Below, the synchronized dubbing circuit of the tape recorder of the present invention will be explained according to FIG. 2. QO is a first motor provided in the first tape deck, and a slide base (not shown) having a head on the first tape deck side The drive mechanism is moved from a stopped state to a reproducing state, or conversely from a reproducing state to a stopped state, and at the same time, the tape in the first tape deck is caused to run. αυ is a first playback switch that is turned on by a playback button (not shown) that puts the first tape deck into playback mode;
(The second motor is located in the second tape deck and is controlled by the first control transistor Q3, which moves the operating mechanisms of the second tape deck in the same way as the first tape deck to bring it into playback or recording mode. .αX is the second playback switch that is turned on by the play button that puts the second tape deck into the playback state, α9 is the recording switch that is turned on by the record button of the second tape deck, αe is the second transistor for control, is a synchronization switch that switches between synchronous and asynchronous modes, and when the recording switch (151), the second control transistor (161, and synchro switch a7) are all turned on, the first control transistor Q31 is turned off. The circuit includes an opening/closing switch a1 that is turned off when the slide base of the first tape deck is in the operating position, a delay circuit (a) connected to the opening/closing switch α1, and a miro-
221, and the miniting signal taken out from the collector of the meeting transistor eυ is transmitted to the second control transistor α.
The collector-emitter of the miniting transistor (221) is added to the base of the amplifier circuit (c) (24).
) is connected between the audio signal circuit (25) and ground.

Next, the operation of the synchro dubbing circuit of the tape recorder according to the present invention will be explained.

First, to perform synchronized dubbing, load a cassette tape, press the play button and record button of the second tape deck on the recording side at the same time, and turn the second playback switch Q41.
and turn on the recording switch Q5). At this time, the first tape deck is still in the stopped state and the slide base is in the non-operating position, so the open/close switch al is on and the minting transistor Qυ is off.
Since a positive meeting signal is applied to the second control transistor (161), the second control transistor α
e is also turned on. And further synchro switch (
If lη is turned on, the base of the first control transistor (19) is at zero potential, so the first control transistor Q3 remains off, so the second motor α is not rotated and the second tape deck is turned off. is put into a recording standby state in which the playback button and the recording button remain pressed and stopped.

At this time, since the meeting transistor (221) is turned on, the audio signal circuit (25) is grounded to prevent noise from being generated from the speaker ab+.

Next, when you press the playback button after loading the tape cassette to be dubbed into the first tape deck, the first playback switch is turned on and the first motor (11) is rotated simultaneously.Then, the rotational force of the first motor The drive mechanism used for playback, such as the slide base, is set to the operating position and the tape is run.At this time, the magnetic head on the slide base comes into contact with the tape, so the tape cassette installed in the first tape deck is played back. When the slide base of one tape deck is placed in the operating position, the open/close switch (lI) is turned off, so the power supply voltage is delayed by the delay circuit (a) and then applied to the base of the meeting transistor (21).
The meeting transistor 0υ is turned on. At this time, as mentioned above, the second playback switch (14) and the recording switch 09 are already turned on, so the meeting transistor CI! When Enoki is turned on, the meeting signal that had been applied to the base of the second control transistor (L6) disappears, and when the second control transistor α6) is turned off, the first control transistor (L6) is turned off. is turned on and rotates the second motor a4. Said second
When the motor (one motor) is rotated, the drive mechanism such as the slide base of the second tape deck is moved in the same way as the first tape cutter, and the second tape deck is placed in the recording state following the playback operation of the first tape deck. The audio signal played on one tape deck is directly applied to the second tape deck and recorded.When playback on the first tape cassette is finished and the tape is stopped, the slide pace moves back to the stop position and the open/close switch (L Since the motor is turned on, the meeting transistor Cυ is turned off and a meeting signal is generated again to turn on the second control transistor a0, so that the second motor (12) is brought to a halt.

Note that even if the second tape deck is brought to a halted state, the first tape deck is not brought to a halted state.

Further, in the above description, the second control transistor (16) was controlled by turning on and off the meeting transistor Qυ, but it may also be turned on and off directly in response to the on/off of the open/close switch ell.

Next, the second tape deck can be posed and released from the pose in synchronization with the pause and release from the first tape deck. That is, a pause button (not shown) is pressed during playback of the first tape deck. At this time as well, the sliding pace of the first tape deck is moved back to a certain extent, separating the pinch roller from the capstan, cutting off the power transmission path to the take-up reel shaft, and stopping the tape from running. When the slide base of the first tape deck retreats, the open/close switch α■ is turned on again and turns off the meeting transistor 0υ, which turns on the second control transistor (16), thereby turning on the first control transistor 04. turn it off,
The rotation of the second motor (12+) is stopped and the second tape deck is placed in a pause state.

When the pause of the ml tape deck is released and the first tape deck is put into the playback state again, the opening/closing switch α group is turned off, so the second control transistor (161
is turned off, thereby turning off the first control transistor (1
31 is turned on and the second motor α rotates to resume recording.

Of course, it is possible to play back only the first tape deck alone, but if you turn off the synchronization switch aη, the second tape deck
Only the tape deck can be put into playback or recording mode. In other words, when the synchro switch a is turned off, the second control
Regardless of whether the transistor aO is on or off, if you press the playback button and turn on the second playback switch (14),
The first control transistors 0 to are also turned on, allowing the second tape deck to be put into the playback state, and furthermore, by pressing the record button at the same time, it is also possible to put the second tape deck into the recording state.

(f) Effects of the Invention As described above, in the synchro dubbing circuit of the tape recorder of the present invention, the first transistor for control is connected to the second motor in the second tape deck that performs recording during dubbing, and the first transistor for control is One transistor is combined with a recording switch and a second transistor for control, which is controlled by an on/off switch used for miniaturizing the first tape deck that performs playback, and when the first tape deck is in an inactive state, the second tape deck is switched on and off. Even when the recording switch is turned on, the second motor is not rotated, and when the first tape deck is put into the playback state and the slide base is placed in the operating position, the opening/closing switch is turned off or on, and the second motor is turned on for control via the second control transistor. Since the first transistor is turned on and the second motor is rotated, the second tape deck can be automatically set to the recording state as the first tape deck enters the playback state, making it convenient for dubbing. Furthermore, since the second motor is rotated after the first motor has rotated, the starting current can be reduced compared to the conventional method of starting the first motor and the second motor at the same time. . Furthermore, when the first tape deck is in the pose state,
The slide base is slightly retracted and the opening/closing switch is turned on or off, allowing the recording side to pause in synchronization with the pause of the playback side, which was previously considered impossible when performing synchronized dubbing electrically, or the pause of the playback side. It is also possible to cancel the pause on the recording side in response to the cancellation.

[Brief explanation of drawings]

FIG. 1 is a synchro dubbing circuit diagram of a conventional tape recorder, and FIG. 2 is a synchro dubbing circuit diagram of a tape recorder according to the present invention. 0I...first motor, 0υ...1st to 8th regeneration switch, (121...second motor, (13)...first transistor for control, αXun...second regeneration switch,
(15) Recording switch, (I6) Second transistor for control, α or Meeting circuit, α
9)... Open/close switch, Cυ... Pating transistor. Applicant Sanyo Electric Co., Ltd. and one other agent Patent attorney Shizuo Sano

Claims (1)

[Claims] (1) A slide base is slid by the rotational force of a first motor located on the side of the first tape deck that performs playback, and an open/close switch is turned on and off by the slide of the slide base. The first control transistor connected to the motor is turned on and off by at least the recording switch of the second tape deck and the second control transistor controlled by the open/close switch, and the slide base of the first tape deck is inoperable. Even if the recording switch is turned on when the recording switch is in the position, the second motor is not rotated, and the first tape deck is put into the playback state, and the second control transistor is turned off or off in response to the opening/closing switch being turned on or off differently than before. turns on, controls the first control transistor, and controls the second control transistor.
A synchronized dubbing circuit for a tape recorder, characterized in that a second tape deck can be placed in a recording state by rotating a motor.