JPH0415539B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape recorder capable of reciprocating playback, in which the magnetic tape is run at high speed from an appropriate position on the magnetic tape until the display on the tape counter reaches zero, and this zero is detected. Therefore, the magnetic tape is automatically played back by running it at a constant speed, and its feature is that it can automatically detect the direction in which the tape counter reaches zero.
Therefore, the time required for the magnetic tape to return to the zero display position is shortened.

Conventionally, in this type of tape recorder, as shown in FIG.
is used). Further, when the magnetic tape 20 travels back and forth and reaches the end 24, the running direction of the magnetic tape 20 is automatically reversed, and the magnetic tape 20 is run in the opposite direction to the arrow A, so that the signal from the track 22 is reproduced or Recording is performed on track 22. By the way, when a magnetic tape is manually operated to move forward or backward, or furthermore, when a magnetic tape is automatically moved back from the forward direction to the end thereof, the direction of travel (forward or backward) is determined by the instruction. However, for example, when playing back the magnetic tape 20, the display on the tape counter is reset to zero (this position is indicated by reference numeral 23), and the magnetic tape 20 is run at high speed from an appropriate position on the magnetic tape 20 where playback has finished. When performing so-called automatic playback, in which the magnetic tape 20 is returned until the counter display becomes zero, and the playback state is automatically started from this zero display position, automatic playback is performed in either direction (forward or backward). Requires instructions on what to do (line). For this reason, conventionally, the direction of the above instruction is set by reproducing in the forward direction or in the backward direction, and the direction of the above instruction is changed only by automatic reversal from forward to backward. It had been. Therefore, even if the magnetic tape 20 is stopped, fast-forwarded, or rewound, the direction of the instruction does not change.

In a conventional tape recorder in which the instruction direction is determined in this way, the magnetic tape 20
At 23 above, the tape counter is reset to zero and forward playback is performed.The magnetic tape is rewound from an appropriate position during this forward movement, and when the tape counter display reaches zero, When automatic playback is performed from , since the indicated direction remains the forward direction, automatic playback is performed in the forward direction. In the same way, the tape counter display is reset to zero at 26 on the magnetic tape 20 and playback is performed in the backward direction, and during this backward movement, the magnetic tape 20 is fast-forwarded so that the tape counter display becomes zero. When automatic regeneration is performed from the point where the vehicle has been used, since the indicated direction at this time is backward, automatic regeneration to backward is performed.

By the way, the tape counter is reset to zero at 23 on the magnetic tape 20, the forward movement of the magnetic tape 20 is played back, and after the running direction is reversed at the end 24, that is, the backward movement of the magnetic tape 20 is started. After starting playback, if you run the magnetic tape 20 at high speed and return it until the tape counter display becomes zero, and then try to start automatic playback from there, the direction of the instruction is different from the one when resetting to zero. Therefore, it will automatically play in the opposite direction. In the above example, even if the magnetic tape 20 returns to the point where the tape counter display is zero, automatic playback from there to the backward playback is performed. For this reason,
Conventionally, when the magnetic tape 20 returns to zero on the tape counter, the magnetic tape 20 must be automatically stopped and then manually played back, for example, in the forward direction. It couldn't function.

As mentioned above, when the magnetic tape is run at high speed so that the tape counter display becomes zero during backward play after reversal, the operator must decide whether to fast-forward or rewind. This has the disadvantage that the operation becomes complicated. That is,
From code 25 on the magnetic tape 20, by fast forwarding,
Further, from 27 onwards, the display on the tape counter becomes zero due to rewinding.

In order to avoid such complicated operations, for example, from the code 27 on the magnetic tape 20 to the magnetic tape 2
Even if you want to return the magnetic tape 20 so that the display on the tape counter becomes 0, fast forward the magnetic tape 20 so that the end 2
In step 4, a manual rewinding operation was performed, and by this rewinding, the magnetic tape was rewound until the tape counter displayed zero. In this case, by performing a forward playback operation before rewinding, the direction specified above will become forward, so when the magnetic tape returns to the point where the tape counter display becomes zero, automatic playback will occur. It is possible to
However, even in this case, the magnetic tape 20 is
There is a drawback that it takes time to fast-forward until the end and then rewind, and even though it is automatic playback, it is necessary to perform forward and backward playback operations manually at the end 24.

In this way, conventional automatic playback devices require manual operation when the automatic reversal from forward to homeward is performed, and the direction of high-speed travel must be changed in order to return the tape counter display to zero. This has the disadvantage that the operation becomes complicated, and furthermore, to avoid this complication, it takes a long time for the display to return to zero.

The present invention eliminates the above-mentioned drawbacks of the prior art, and with a single touch, the magnetic tape is returned until the tape counter display reaches zero, and automatic playback is performed from there.

An embodiment of the present invention will be described below with reference to FIG. In Fig. 2, 1 is a reel stand;
As is well known, pulses corresponding to the rotation of the reel stand are obtained from the sensor 2. This pulse is supplied to the tape counter 3 as is well known, and is added in the forward direction and subtracted in the backward direction depending on the rotation direction of the reel stand 1. 4 is an indicator and counter 3
The count value is displayed. 5 is the above reel stand 1
The drive motor 6 is a well-known capstan drive motor, and these are driven by drive circuits 7 and 8, respectively. Reference numeral 9 indicates mechanisms such as a well-known head table moving mechanism, pinch roller movement mechanism, and reel table brake, which are driven by a mechanical drive circuit 10. Reference numeral 11 denotes a flip-flop circuit, which outputs Q by operating the forward playback switch 12.
is triggered to become "H", for example, and the output Q is triggered to become "L" by operation of the backward playback switch 13,
This state is maintained. These switches 12,
13, the mechanism 9 is also driven as is well known, but since this is not directly related to the present invention, detailed explanation will be omitted. The drive circuit 8 is controlled by the above output Q, and when the output is "H", the capstan is rotated in the forward direction, and when it is "L", the capstan is rotated in the backward direction. This output Q is supplied to a detection circuit 14 and converted into a signal to be described later. When a switch 15 to be described later is operated, a signal indicating the direction of forward or backward direction is stored in the memory 16. The switch 15 is operated to reset the display on the tape counter 3 to zero. 17 is a comparator, and when the display (count value) on the indicator 4 of the counter 3 can change from "0000" to "9999", the count value from the counter 3 is stored in advance. and "5000" (a value greater than or equal to the count value from one end of the magnetic tape to the other). Reference numeral 18 denotes an automatic regeneration key switch, and when this is operated, the output of the comparator 17 is supplied to the drive circuit 7. In addition, mechanical drive circuit 1
The output from the direction detection circuit 19 and the output from the drive circuit 7 are input to 0. When the motor 5 is rotated by the reel motor drive circuit 7 for high speed running of the magnetic tape, a signal is output to the mechanical drive circuit 10 to set the mechanism 9 in a state for high speed running. The direction detection circuit 19 is supplied with a signal indicating the designated direction from the memory 16 and the output of the AND gate 30. The output of the counter 3 is passed through this gate 30,
When this output is zero, the circuit 1 is configured to run the magnetic tape at a constant speed in the direction stored in the memory 16.
Mechanism 9 is controlled via 0. At this time, circuit 1
The drive circuit 7 is also controlled by the output of 0, and the reel motor 5 is rotated for constant speed running. Reference numeral 31 denotes a flip-flop, and when the switch 18 is operated, the output becomes "H", and the output of the counter 3 can pass through the gate 30. When the output of the tape counter 3 becomes zero, it is input to the detection circuit 19 via the gate 30, but after a delay time of the delay circuit 32,
The flip-flop 31 is reset and the output of the tape counter 3 cannot pass through the gate 30. Therefore, in the above-mentioned high-speed running state, the counter 3
Even if the counter 3 becomes zero and the counter 3 is reset to zero by the switch 15, this output will not remain at the gate 30.
cannot pass through. When the output zero of the counter 3 passes through the gate 30 and enters the detection circuit 19, the mechanism 9 is controlled via the drive circuit 10 so that automatic reproduction can be performed in the direction of the instruction stored in the memory 16 at this time. As mentioned above,
If the direction at this time is going forward, the terminal C becomes "H", and if the direction is going home, the terminal C becomes "L". Direction is determined. still,
Reference numeral 33 indicates an inverter that inverts the output of terminal C. Further, this tape recorder is capable of reciprocating playback, and the flip-flop circuit 11 is also triggered when the end of the magnetic tape is reached.

The operation of the tape recorder shown in FIG. 2 will be explained.

First, when the switch 12 is manually operated, the output Q becomes "H" as described above, the capstan rotates in the forward direction, and forward playback is performed. When the switch 15 is operated after operating the switch 12, the display on the indicator 4 of the tape counter 3, that is, the count value, is reset to zero, and the signal from the detection circuit 14 indicating the forward direction is stored in the memory 16. be done. When this reproduction reaches the end of the magnetic tape, the reproduction is reversed to backward reproduction. During this backward playback, if the switch 18 is operated to perform automatic playback, the counter 3 in the comparator 17
The count value is compared with a predetermined value stored in the comparator 17 (this is a value slightly larger than the count value when the magnetic tape runs from one end to the other, for example, "5000"). A signal from the comparison is output. This output signal causes the drive circuit 7
The mechanical drive circuit 10 is controlled to enable the mechanism 9 to run at high speed, and when the count value of the output signal is smaller than a predetermined value, it is used as a rewind signal, and when it is larger, it is used as a fast forward signal. The reel motor 5 is rotated in the rewinding or fast forwarding direction by the signal supplied to the drive circuit 7 as a signal, thereby rewinding or fast forwarding the magnetic tape. By operating this switch 18, the output of the flip-flop 31 is supplied to the AND gate 30, and the count value of the tape counter 3 is supplied to the direction detection circuit 19. When the count value of the counter 3 becomes zero in this state, this is detected and the signal is sent via the detection circuit 19 and the drive circuit 10 to the input 9 and the drive circuit 7 based on the signal indicating the designated direction stored in the memory 16. The motor 5 is driven, the stable state of the flip-flop circuit 11 is also selected, the capstan motor 6 is also rotated in a predetermined direction, and the magnetic tape is automatically moved forward or backward based on the output of the memory 16. , automatic playback will occur.

The above explanation is for the case where the switch 18 is operated when the magnetic tape is reversed at the end of the tape and is traveling in the backward direction. Automatic playback is possible by operation.

Further, although automatic reproduction has been described in the above embodiment, it is also possible to perform automatic stopping in the same manner and to determine the direction of the instruction in this stopped state.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram used to explain the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention. 3...Counter, 17...Comparator.

Claims (1)

[Claims] 1. A magnetic tape that is capable of reciprocating playback, and that runs the magnetic tape at high speed from an appropriate position on the magnetic tape to a position where a tape counter displays zero, and automatically reproduces the tape from the position where the tape counter displays zero. In an automatic playback device for a tape recorder, which uses a tape counter that increases when the magnetic tape goes forward and subtracts when it goes backwards, it is possible to perform forward or backward playback. a direction detecting means for detecting the set forward or backward direction; a reset means for resetting the counter to zero; and a direction detecting means for detecting the set forward or backward direction; a memory for storing; automatic reproduction instruction means; means for comparing the count output of the counter with a predetermined value in response to the automatic reproduction instruction, and fast forwarding or rewinding according to the comparison output; and the fast forwarding or rewinding. An automatic playback device for a tape recorder, comprising means for reproducing the tape by moving the tape forward or backward in the direction stored in the memory when the count output of the counter becomes zero.