| 摘要 |
<p>PURPOSE:To keep the feed quantity of a tape at every intermittent feed constant, by keeping the revolving speed of a capstan motor being driven in a forward direction constant, and adjusting torque so as to keep a braking time in a backward direction at every tape feeding constant by detecting it. CONSTITUTION:A speed detection circuit 20 detects the revolving speed of a motor from a capstan FG signal, and detects an error by performing subtraction with a speed preset value in driving in the forward direction in a speed setting circuit 21. And the revolving speed is stabilized at a preset level by an error amplifier 23. Meanwhile, a backward braking time detection circuit 25 detects the braking time in the backward direction by inputting a backward direction command (e), and calculates the error by performing the subtraction with the preset value of a backward braking time setting circuit 26, and stabilizes the revolving speed at the preset value by an error amplifier 28. Then, by turning on switches 24 and 29, appropriate torque at the time of driving in the forward and the backward directions can be outputted. In such a way, it is possible to keep the feed quantity of the tape at every intermittent feed constant.</p> |
