JPS6047654B2 - Tape entrapment prevention device for reciprocating tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tape entanglement prevention device for preventing the tape of a tape recorder from being entangled in a capstan or the like during running, and is particularly designed to unwind the wound tape.

A conventional tape winding device is, for example, as shown in FIG.
A device is known in which a wall 3 is provided on a pinch lever 2 that holds a pinch roller 1 so as to face the outer periphery of the pinch roller 1 so that the pinch lever 2 does not wrap around the outer periphery of the pinch roller 1.

Furthermore, the presence of the tape 4 protruding into the pinch lever 2 is detected by a photoelectric detection device consisting of a pair of light emitting/light receiving elements 5 and 6 attached to the pinch lever 2, and the running of the tape recorder is stopped. etc. are known. Note that 7 is a capstan. However, with these devices, if a large amount of tape protrudes outside the pinch lever 2, or if extremely thin tape such as C-120 is used, the effect is not fully demonstrated, and the pinch roller The tape is often caught in the gap between the tape 1 and the wall 3, and there is a risk that the tape may be cut.

Furthermore, the winding phenomenon can occur not only on the pinch roller side but also on the capstan, and as no countermeasures have been taken in the past, the reel shaft does not stop when the tape is wound, and a large amount of tape winds around the capstan. In some cases, the tape cannot be easily removed from the recorder body.

In addition, in tape recorders that perform stop/reverse operations by detecting the stoppage of the reel shaft, the reel shaft instantly reverses during reverse, so it is not possible to detect the stoppage of the reel shaft, and the tape ends up being wound up. could not be prevented. In view of this point, the present invention aims to eliminate the above-mentioned drawbacks by reliably preventing the tape from being entangled or unwinding it.

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a schematic plan view showing an example of the present invention, where 11 is a right reel motor, 12 is a left reel motor, 13 is a capstan motor, 14 is a right fly hole, and 15 is a left fly hole. , 16 is the right pinch roller,
17 is a left pinch roller; 18 is a solenoid for connecting or releasing the pinch roller 16 from the capstan 20;
19 is a solenoid for connecting or releasing the pinch roller 17 from the capstan 21, and 22 is a belt. The right reel stand 23 and the left reel stand 24 are equipped with reel motors 11 and 12 directly connected to each other, respectively. Reel motors 11 and 12 have rotation direction detectors 25 and 2, respectively.
6 is provided, and is configured to send out a constant signal when the rotation direction of the reel motor is switched. The outputs of these rotational direction detectors 25 and 26 are supplied to a traveling direction control circuit 27, which is configured to send an activation signal for each solenoid 18 and 19 and an activation signal for a capstan motor rotational direction switching circuit 28. . It is now assumed that the capstan motor 13 is rotating counterclockwise to drive the right capstan 20, and the right pinch roller 16 is in rotational contact to feed the tape 29 to the right in a normal direction playback state.

For some reason, Capstan 20 or Pinch Lo. -ra1
When the tape 29 starts to be wound into the tape 6, the right side (take-up side) reel motor 11 starts to rotate abnormally from the normal counterclockwise rotation to the clockwise direction.

Therefore, the rotation direction detector 25 detects this reversal, and a signal is immediately supplied to the running direction control circuit 27. Therefore, the power to the reel motor 11 is cut off, and the solenoid 18
The power will be cut off. Therefore, the counterclockwise rotational force of the reel motor 11 is eliminated, and the pinch roller 16 is separated from the capstan 20. At the same time as these series of operations, the left (supply side) reel motor 12
Power is applied to the solenoid 19 to rotate the pinch roller 17 to the capstan 21, and the motor rotation direction switching circuit 28 is activated to rotate the capstan motor 13 clockwise. Since the running direction control circuit 27 operates in this manner, the tape 29 is sent out to the left. Therefore, the tape 2 wound around the capstan 20 or the pinch roller 16
9 is gradually unwound by rotation of the capstan motor 13 and rewinding by the supply side reel stand 24, capstan 21, and pinch roller 17. Note that when the tape 29 wraps around the pinch roller 16,
Although it is not necessary to perform the above operations, the tape 29
In order to unwind the material without cutting it, it is best to perform the above-mentioned operation. Although the above explanation has been made regarding the case where the tape is wound around the gear stub or pinch roller during normal playback, it is also possible to unwind the tape when it is wound up during reverse playback in the same way.

However, the above explanation will be used and the explanation will be omitted. In addition, in the above example, the reversal of the reel motor is detected and carried out.
As an alternative, the same effect can be obtained by providing a reverse rotation prevention mechanism on the reel shaft, detecting the stoppage of the reel shaft, and taking similar measures. As described above, according to the present invention, the two
In a reciprocating type tape recorder in which the capstan of the book is driven to rotate in the same direction and the tape running is switched by changing the rotational direction of the motor, the tape is directly or indirectly connected to the reel shaft which is the winding side during reciprocating running. A detector is provided to detect the rotational direction of the reel shaft, and when the reel shaft rotates in the opposite direction to the winding direction of the tape, a running direction control circuit is actuated by a signal from the detector to detect the direction of the wound tape. The running of the tape is reversed after the pinch roller is separated from the capstan, so even if the tape gets caught in one capstan or pinch roller, the other capstan immediately rotates in the opposite direction and the tape is reversed. The wound tape is unwound, and at this time, the pinch roller on the wound side is released from the capstan, so that no excessive load is applied to the tape, and the tape is unwound. This has the effect of preventing damage to the tape and preventing the tape from being wound in the opposite direction again at the same portion.

[Brief explanation of the drawing]

FIG. 1 is a route map showing a conventional example, and FIG. 2 is a route configuration diagram showing the structure of a reciprocating tape recorder showing an example of the present invention. 11, 12... Reel motor, 16, 17...
・Pinch roller, 18, 19...Solenoid,
20, 21... Capstan, 23, -24.
. . . Reel stand, 25, 26 . . . Rotation direction detector, 27 . . . Running direction control circuit.

Claims (1)

[Claims] 1. In a reciprocating tape recorder in which two capstans that run forward and backward are driven to rotate in the same direction, and tape running is switched by switching the rotational direction of the motor, the reel that is the take-up side during reciprocation A rotation direction detector that directly or indirectly detects the rotation direction of the reel shaft is provided on the shaft, and from a signal from the rotation direction detector when the reel shaft rotates in the opposite direction to the direction in which the tape is wound. A tape entrainment prevention device for a reciprocating tape recorder, characterized in that a tape entrainment prevention device for a reciprocating tape recorder is provided, which is provided with a running direction control circuit that separates a pinch roller on the tape winding side from a capstan and then reverses the running of the tape.