| 摘要 |
<p>PURPOSE:To prevent tape tension from varying even when tape drawing speed is suddenly accelerated and decelerated at the time of loading. CONSTITUTION:A rotational frequency of a loading motor 6 and loading positional information are inputted to a loading speed detector 17, where the tape drawing speed V at the loading time is obtained, and its acceleration Vacc is obtained via a differentiation calculator 19. On the other hand, a radius Rt and inertia Jt of a take-up reel are detected by blocks (reel radius detector and reel inertia detecor) 20 and 21, and the information of the Vacc, Rt and Jt is inputted to a loading acceleration compensating torque calculator 23, where correcting torque for suppressing a tension variation attending upon a tape speed change at the loading time is calculated. Torque obtained by adding torque proportional to the reel radius and the compensating torque is imparted to the take-up reel at the loading time.</p> |
