JPH0343702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/playback device that enables rewind playback.

In a magnetic recording/playback device, rewinding and playback can be accomplished by reversing the capstan and winding the tape using the supply reel motor.

When this rewind playback operation is stopped, the capstan usually has a flyhole, so the reversal continues and the tape is fed out, but the reel stops rotating and the tape ends up running out of the running path. Become. Therefore, there is a drawback that the tape may come off from the cylinder or become entangled with various parts on the deck, damaging the tape.

The present invention was made to eliminate these drawbacks, and an object of the present invention is to provide a magnetic recording and reproducing apparatus that does not cause tape slack or damage during rewinding or after rewinding and reproducing.

The magnetic recording/playback device according to the present invention includes a rotation direction detection means for detecting the rotation direction of the capstan and outputting a reverse rotation signal at least until the capstan returns to normal rotation during rewind playback. (In this case, the winding function) is to maintain the winding of the reel motor.

First, the overall configuration will be explained. In the figure, 1 is a cassette in which a supply reel 2, a take-up reel 3, and a tape 4 are stored. The supply reel 2 is rotated by a first motor 5, and the take-up reel 3 is rotated by a second motor 6. The tape 4 is connected to the first guide 7 of the tape.
And the tape can be moved upward by movement of the second guide 8. This is called loading. By loading, the tape wraps around the cylinder 9 by approximately 180 degrees. 10 indicates this loading, the first guide 7, and the second guide 8.
This is the motor that provides the power for the "unloading" operation that returns the robot to its original position. 11 is a motor that rotates the cylinder 9. Reference numeral 12 denotes a capstan, which is rotated by a motor 13. At this time, a pinch roller 14 is brought into pressure contact with the capstan 12, thereby feeding the tape. The tape is fed by the capstan 12 mainly during recording and playback. In this case, reel 3 is loaded when loading is completed.
and capstan 12 are motor 6 and motor 1, respectively.
3 to rotate it clockwise. Further, the reel 2 is pulled by the tape 4 and rotates clockwise.
During fast forwarding, unloading is completed and the pinch roller 14 is released from pressure, and the reel 3 is rotated clockwise at high speed by the motor 6 to feed the tape 4. At this time, the reel 2 is pulled by the tape 4 and rotates clockwise.

At the time of rewinding, the unloading is completed, the pinch roller 14 is released from pressure, and the reel 2 is rotated counterclockwise at high speed by the motor 5, and the tape 4 is rotated at high speed by the motor 5.
send. At this time, the tape 4 is pulled on the reel 3 and rotates counterclockwise.

In the above description, the pinch roller is brought into pressure contact by temporarily energizing the plunger 15. Retention is achieved by continuous energization to the plunger 16, and release is achieved by stopping the energization to the plunger 16.

Next, control of the rotation speed will be explained. 17 is the first control circuit, which controls the rotation of the cylinder at 30 degrees per second.
controlling the rotation of the motor 11 so that the motor 11 rotates when the first signal 19 indicating the playback state or the second signal 20 indicating the recording state is present from the mode control circuit 18; When both the first signal 19 and the second signal 20 are not present, the rotation of the motor 11 is stopped. Furthermore, a vertical synchronizing signal 21 is sent from the video circuit 22.
When this occurs, the rotation of the motor 11 is controlled so that the image heads 23 are aligned in the horizontal direction.

24 is a second control circuit that controls the rotation of the motor 13 so that the speed of the tape 4 is 33.35 mm per second during recording or playback, rotates the motor 13 during playback or recording, and controls the motor 13 when neither is the case. It acts to stop the rotation of 13. Furthermore, the control pulse output 26 from the head 25
The rotation of the motor 13 is controlled so that the vertical synchronization signal 21 can be synchronized with the vertical synchronization signal 21.

Next, recording and reproducing of signals will be explained. 27
is a video signal input terminal, and the video signal added thereto is converted into an FM signal by the action of the video circuit 22 during recording, and is supplied to the video head 23 and recorded on the tape 4. At this time, vertical synchronization signal 2
1 is the first control circuit 17 and the second control circuit 24
A video signal is supplied to the video signal output terminal 28. During playback, the output of the video head 23 is supplied to the video circuit 22 and sent to the output terminal 28.
The vertical synchronizing signal 21 is demodulated into a video signal and supplied to the first and second control circuits 17 and 2.
4.

Reference numeral 29 denotes an input terminal for an audio signal, and the audio signal added thereto is supplied with a high frequency bias by the action of an audio circuit 30 during recording, and is supplied to the head 25 and recorded on the tape 4. At this time, an audio signal is supplied to the audio output terminal 31, and a high frequency bias is applied to the full width erase head 32 to erase the previous recording. During playback, the output of the head 25 is supplied to an audio circuit 30, and an audio signal is supplied to an output terminal 31. The operations of the video circuit 22 and the audio circuit 30 described above are based on the first signal 19 and the second signal 20.
The recording or playback mode is switched depending on the presence of the .

Next, the mode control circuit 18 will be explained.

40 to 42 are mode switching input signal lines 1,
2 and 3, and 44 and 45 are mode switching input signal lines 1 and 2, respectively. 33 is a fast forward switch;
34 is a rewind switch, 35 is a stop switch, 36 is a recording switch, 37 is a playback switch, and 38 is a pause switch. When the switches 33 to 37 are temporarily turned on, the mode control circuit 18 operates to cancel the previous mode and maintain the mode of the switch, so that the operation of the motor or solenoid is adapted to that mode. A control signal is issued. When the switch 38 is temporarily turned on during recording or playback, the control circuit 18 operates to temporarily stop energizing the plunger 16 and release the pinch roller 14 from pressure. When the switch 38 is temporarily turned on again, the normal playback and recording state is restored. Reference numeral 46 is a rotation control signal for the first motor 5, which causes the first motor 5 to rotate and wind up the tape 4 during rewinding and unloading via a first drive circuit 47. 48 is the second motor 6
This rotation control signal is sent via the second drive circuit 49 to rotate the second motor 6 and wind the tape 4 during fast forwarding, playback, and recording. 50
is a rotation control signal for the motor 10, which rotates the motor 10 during loading and unloading via the third drive circuit 51. 52 is a control signal for the plunger 15, and is a control signal for the fourth drive circuit 5.
3 to drive the plunger 15. 54
is a control signal for the plunger 16 and drives the plunger 16 via the drive circuit 53. The mode control circuit 18 that operates in this manner can be constructed using hardwired logic, but recently it can also be implemented using a microcomputer.

Next, a supplementary operation of the control circuit 18 will be explained. At the end of the tape 4, a part without magnetic material is constructed to transmit light, and when the end of the tape is reached during playback, recording, and fast forwarding, the light from the lamp 56 is transmitted and the phototransistor 57 is energized. At this time, the tenth drive circuit 57 is operated and the control signal 58 causes the control circuit 18 to set the control circuit 18 to the stop mode. Also, at the beginning of tape 4, there is a part without magnetic material that allows light to pass through.
At the beginning of the tape during rewinding, the phototransistor 59 is energized. At this time, the eleventh drive circuit 60 is activated and set to the stop mode via the control circuit 18 in response to the control signal 61. Further, 62 is a rotating magnet, which is connected to the reel 3 by a belt 63.
As the reel 3 rotates, the rotating magnet 62 also rotates. The Hall element 64 detects a change in magnetic flux due to the rotation of the magnet 62, causes the drive circuit to actuate 65, and a control signal 66 is supplied to the control circuit 18. The control circuit 18 enters a stop mode when the control signal 66 is absent during recording, playback, fast forwarding, or rewinding. This is to prevent the risk of the tape accumulating in the deck and damaging the tape or the head 23 if the reel 2 continues to rotate even after the reel 3 stops rotating. Also, 67 is a humidity detector, and 90%
When the humidity reaches the above level, the resistance value increases rapidly, and the thirteenth drive circuit 68 supplies a control signal 69 to the control circuit 18 in response to this resistance value increase. At this time, the control circuit 18 operates to enter the stop mode. This prevents the tape 4 from wrapping around the cylinder and damaging the tape if there is dew condensation on the cylinder 9 in a high humidity condition.

Next, fast-forward playback and rewind playback, which is a feature of the present invention, will be explained. In the figure, reference numeral 71 denotes a switch for fast-forward reproduction, and when this switch is closed during reproduction, a third signal 72 is generated, and the second control circuit 24 causes the motor 13 and capstan 12 to rotate at high speed. Therefore, fast-forward playback becomes possible.

On the other hand, 74 is a rewind playback switch, and when this is closed during playback, a fourth signal 73 is generated, and a second
The control circuit 24 of the motor 13 and the capstan 1
Reverse 2 at high speed. Therefore, rewind playback becomes possible. At this time, the supply reel motor 5 performs high-speed winding to prevent the tape from sagging. However, after the rewind/playback switch 74 is opened, the capstan 12 attempts to return to normal rotation, but due to the inertia of the flywheel, etc., the capstan 12 continues to rotate in reverse for a certain finite time. On the other hand, since the supply reel motor 5 stops high-speed winding when the rewind/reproduction switch 74 is opened, the tape conventionally deviates from the normal running path, damaging the tape.

The present invention eliminates the drawbacks as described above, and has a configuration in which 80 in the figure is a rotation direction detection means for detecting the rotation direction of the capstan, and 81 is a signal that rotates the motor 5 to enable high-speed winding while the capstan is being reversed. .

With this circuit configuration, the rotation direction detection means 80 outputs the reverse rotation signal 81 when the rewind playback switch 74 is closed and after the rewind playback switch 74 is opened until the capstan 12 returns to normal rotation. too,
Even after the rewind/playback switch 74 is opened, the tape can be kept in a state without slack, and the tape can be prevented from being deviated from the running path and being damaged.

As described above, the present invention detects the rotating direction of the capstan and controls the winding state of the reel motor, so that the tape can be maintained in a normal state without sagging, and damage to the tape can be prevented.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. In the figure, 2 is the supply reel, 4 is the tape, and 5 is the supply reel.
12 is a capstan, and 80 is a rotation direction detecting means.

Claims (1)

[Claims] 1. In a magnetic recording/playback device that performs rewind playback by rotating the capstan in reverse, the capstan, which continues to rotate in reverse due to inertia even after the rewind playback operation is canceled, and the direction of rotation of this capstan are detected, and at least the above The present invention is characterized by comprising a rotation direction detection means that outputs a reverse rotation signal until the capstan returns to normal rotation, and a supply side reel motor that continues tape winding while the reverse rotation signal is output. A magnetic recording and reproducing device.