| 摘要 |
<p>PURPOSE:To prevent the roll-in of the tape as well as secure the unting of the tape winding by providing the detector to the reel axle functioning as the take-up side to detect the rotational direction at the tape running time and then actuating the detector at the time of backward turning. CONSTITUTION:At the normal time, capstan motor 13 turns counterclockwise to drive right capstan 20, and then pinch roller 16 turns in touch to send out tape 29 to the right side. At the time of the tape roll-in, right reel motor 11 turns clockwise, and rotational direction detector 25 detects the backward rotation and the trasmits the signal immediately to running direction control circuit 27 to cut off the power supply to motor 11 and then solenoid 18. Thus the rotary power of motor 11 is lost, and thus roller 16 detaches from capstan 20. At the same time, the power is supplied to left reel motor 12 to make pinch roller 17 turn in touch to capstan 21. And circuit 27 switches motor rotational direction switching circuit 28 so that the power may be supplied to solenoid 19 to give the clockwise rotation to capstan 13, and thus tape 29 runs to the left side. Thus the unting of tape 29 is carried out via motor 13, reel stand 24, capstan 21 and roller 17 each.</p> |
