JPS6115499B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic magnetic tape reversing device in a tape recorder, and more particularly, it includes a tape counter, an auto mode selection switch, and one switch for specifying auto play and auto rewind. This invention relates to an automatic reversing device for a magnetic tape which can be simply constructed and obtained at low cost, in which auto-play and auto-rewind of a magnetic tape can be arbitrarily and automatically performed using a switch.

FIG. 1 specifically shows an automatic magnetic tape reversing circuit according to the present invention, and 1, 2, and 3 are a playback (drive) circuit, a stop circuit, and a rewind (drive) circuit in a tape recorder. , switches 4, 5, and 6 are connected to these for starting the operation of each circuit. The output sides of the reproducing circuit 1 and rewinding circuit 3 are connected to one input terminal, respectively, of NAND gates 7 and 8 constituting the comparison circuit, and the other input terminals of the NAND gates operate the tape recorder for rewinding. Fixed contact 1 of switch 9 that switches from playback operation to rewinding operation and from playback operation to rewinding operation.
0,11. 12 is a fixed contact used for normal operation of the tape recorder; 13 is a fixed contact with a counter switch 15 connected between it and the power terminal 14; Each fixed contact 10
12. Also, above
A switch 17 is connected to the output side of the NAND gates 7 and 8.
18 are connected to each other, and the two output sides of each of these switches are connected to the input sides of the playback circuit 1 and the stop circuit 2, and the drive input sides of the rewind circuit 3 and the stop circuit 2. On the other hand, 1
9 and 20 are NAND gates that constitute the comparison circuit.
The output sides of the reproducing circuit 1 and the rewinding circuit 3 are connected to one input terminal of each, and a magnetic tape end detection circuit 21 is connected to the other input terminal. Further, switches 22 and 23 are connected to each output terminal of the NAND gates 19 and 20, the two output sides of the switch 22 are connected to the input sides of the rewind circuit 3 and the stop circuit 2, and the output side of the switch 23 is connected to the input side of the rewind circuit 3 and the stop circuit 2, respectively. They are connected to the input sides of the regeneration circuit 1 and the stop circuit 2, respectively. In addition, the above switch 17
and 23 and switches 18 and 22 are electronically interlocked, so that only one operating knob 24, 25 is visible on the panel of the tape recorder, as shown in FIG. Above switch 9
As shown in FIG. 2, it has an operating knob 26 connected to the movable contact piece 16, and an appropriate display designating auto play and auto rewind is provided around the operating knob 26. Further, on the upper surfaces of the operation knobs 24 and 25, line indications 27 and 28 as shown in the figure are provided, and along with these line indications, symbols 29 and 30 indicating constant speed running and rewinding running of the magnetic tape are placed on the panel. It is shown as being continuous within the displayed loop-shaped closed annular line 31.

In a device having such a configuration, when a rewinding operation is performed during playback of a magnetic tape and the rewinding is automatically stopped or the playback operation is restarted continuously following the end of the rewinding, is the line display 27, 28 of the operation knobs 24, 25 on the above panel.
is rotated so that it coincides with the loop-shaped closed annular line 31 (the state shown in FIG. 2). With this adjustment, the switches 17 and 23 related to the operation knob 24
is used to switch the tape recorder so that the rewinding operation can be continued to the playback operation, and the operation knob 25 is switched so that the playback operation can be continued to the rewinding operation. Here, the switch 9 moves the movable contact piece 1 in order to change the tape recorder from rewinding operation to playback operation or stop operation.
6 is switched so that it is connected to fixed contacts 10 and 13. Also, for example, a three-digit counter can be set to "0,"
0, 0'' and close the counter switch 15. Then, the playback switch 4 is operated to start the playback operation. This playback switch 4 immediately returns automatically, but the playback mode of the tape recorder is maintained and the magnetic tape (not shown) is
moves in the direction of arrow a from point A shown in FIG. 3, and the numbers on the counter are incremented one after another. Then, at any point B, the rewind switch 6
When the rewinding operation is performed by operating the rewinding circuit 3, the operation of the rewinding circuit 3 is immediately maintained and the magnetic tape is rewound in the direction of arrow b. As soon as the counter reaches "0, 0, 0", the counter switch 15 is closed and a signal current is supplied from the terminal 14 to one input terminal of the NAND gate 7, and at this time the other input Since the output signal for rewind mode is supplied to the terminal, this
The NAND gate 7 is turned on, and the NAND gate 7 is turned on via the switch 17 switched as described above.
The output of the reproducing circuit 1 is supplied to the input side of the reproducing circuit 1. In this way, the magnetic tape travels for reproduction in the direction of arrow c from point C where the counter ``0, 0, 0'' is displayed, and reaches point D at the end of the magnetic tape. , when the magnetic tape end detection circuit 21 operates,
The termination detection signal is NAND along with the reproduction circuit output signal.
The operating current is supplied to each input terminal of the gate 19, and from its output terminal is inputted to the rewinding circuit 3 via the switch 22, so that the magnetic tape is rewound again in the direction of the arrow d. When the counter display returns to "0, 0, 0" again, the playback mode is established, and the magnetic tape is played back in the direction of arrow C up to point D as described above, and this operation is automatically repeated. Furthermore, when the operation knob 24 is switched as shown by the dotted line and the rewind switch 6 is closed during playback, the magnetic tape is rewound from point B at that point in the direction of arrow f. However, since the output side of the switch 17 is connected to the stop circuit 2, it is automatically stopped at point C as soon as the counter reaches "0, 0, 0". Furthermore,
In this case, the movable contact piece 1 of the switch 9
6 is connected to the fixed contacts 12 and 13, the tape recorder operates normally, and depending on the operation of the rewind switch 6, the tape recorder starts g
Run towards the tip of the direction. When the magnetic tape reaches the starting edge, it is also possible to use the starting edge detection circuit again to cause the magnetic tape to automatically run for reproduction.

Next, a case will be described in which a rewinding operation or a stopping operation is automatically performed from a playback operation. In this case, first, the movable contact piece 1 of the switch 9
6 is connected to the fixed contacts 11 and 13, the counter is set to "0, 0, 0", and the switch 15 is closed. In particular, in order to automatically enter the rewind operation from the playback operation, the operation knob 25 is set as shown, and the input sides of the switches 18 and 22 are connected to the input side of the rewind circuit 3. Switch to . When the playback mode switch 4 is closed, the output signal of the playback circuit is supplied to each input terminal of the NAND gates 8 and 19, and the magnetic tape moves from point H in the direction of arrow h, and the counter is advanced to the position where "0,0,0" is set, and the magnetic tape is run to point I corresponding to the display position of "0,0,0". Then, the switch 15 is closed, the current input to the terminal 14 is supplied to the other input terminal of the NAND gate 8, and an output signal is obtained at its output side.
This is supplied via the switch 18 to the input side of the rewinding circuit 3. In this way, as shown in FIG. 4, the magnetic tape is rewound and runs from point I in the direction of arrow j at high speed. Then, as soon as the magnetic tape reaches its starting edge, the starting edge of the magnetic tape is detected in the same way as in the case of detecting the ending edge above.
The detection output is supplied to the NAND gate 20, and a current is obtained on the output side of the NAND gate 20, which is supplied to the reproducing circuit 1 via the switch 23, so that the magnetic tape can be reproduced again. Then, such an operation can be automatically repeated. On the other hand, the operation knob 25
The switches 18 and 2 are rotated as shown by the dotted lines.
When the output side of the switch 18 is connected to the stop circuit 2, when the counter becomes "0, 0, 0" during the reproducing operation, an output current is obtained to the NAND gate 8, and the output side of the switch 18 is connected to the stop circuit 2. Since it is connected, the playback operation is stopped at that point,
The magnetic tape stops running. In addition, when the movable contact piece 16 of the switch 9 is connected to the fixed contacts 12 and 13, the magnetic tape will run at a constant speed in the k direction from the starting point to the end point regardless of the counter display. Become. Since automatic reversing of the magnetic tape is meaningless during recording, it is necessary to provide a switch or the like to stop the operation of the reproducing circuit during recording.

As described above, the present invention includes a counter, a switch for specifying the reproducing operation and rewinding operation of a magnetic tape, and a switch that continuously performs each of the specified operations from the rewinding state or the reproducing operation state, respectively. By combining a switch for stopping or stopping, continuous switching between play mode and rewind mode can be easily and reliably performed.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and Fig. 1 is a specific circuit diagram showing an automatic magnetic tape reversing device according to the present invention, and Fig. 2 shows the switch knobs used in this circuit and the notation on the panel. FIGS. 3 and 4 are explanatory diagrams showing the automatic reversal operation in the present invention. 1... Reproduction circuit, 2... Stop circuit, 3... Rewind circuit, 7, 8... Comparison circuit, 9... Third switch, 15... Counter switch, 17... First
Switch, 18...Second switch.

Claims (1)

[Claims] 1. A playback circuit, a stop circuit, and a rewind circuit for running a magnetic tape, a first switch connected to specify the operation of any of these playback circuits and stop circuits, and these rewind circuit and stop circuit. a second switch connected to specify either operation;
a comparator circuit, each having an output terminal connected to the input side of the switch, and one input terminal each connected to the output side of the rewinding circuit and the reproducing circuit, and the other input terminals of each of these comparator circuits. a third switch for specifying auto play and auto rewind; and a counter switch connected to the third switch; An automatic reversing device for a magnetic tape in a tape recorder which has auto play, auto rewind or auto stop.