| 摘要 |
<p>PURPOSE:To make a decelerating position intact by accurately calculating a winding amt. even when a capstan motor is under acceleration or deceleration or the speed of the capstan motor is changed by a load upon a magnetic tape under fast forwarding/rewinding operation. CONSTITUTION:Under the fast forwarding operation, the rotation of the capstan motor 11 is transmitted via a gear train 14 to a T-reel 16, and the magnetic tape is taken up. Then, under the rewinding operation, the rotation of the capstan motor 11 is transmitted via the gear train 14 to an S-reel 15. In accordance with the rotation of both reels 15 and 16, their respective rotary pulses are detected by reel pulse detecting parts 17 and 18 respectively and are outputted to a winding amt. discriminating part 19. By counting these rotary pulses, whether their respective reels are revolved one round or not can be decided.</p> |
