| 摘要 |
<p>PURPOSE:To shorten a time required for a tape to reach a desired speed, by making a voltage rise by an arbitrary function from a rotation start voltage of a reel motor when the reel motor is driven. CONSTITUTION:A magnetic tape 1 is rewound, and the voltage to a takeup-reel motor 2a is increased from zero according to an arbitrary function. By reel sensors 2b and 3b fitted to a take-up reel 2 and a supply reel 3 respectively, a voltage Vr impressed on the motor 2a or 3a is stored and held at the time point when a rotation pulse is inputted, that is, when either of the reels rotates. On the occasion when the motor 2a or 3a is driven thereafter, the voltage is increased from the voltage Vr by an arbitrary function by a motor servo circuit 4 and thereby the motor is started.</p> |
