| 摘要 |
<p>PURPOSE:To speedily attain a synchronous operation by controlling the revolution speed of a capstan motor by setting a frequency-dividing pulse as reference. CONSTITUTION:The subject device is provided with FG pulse frequency-dividing means 21-23 which frequency-divide G pulses outputted in accordance with the revolution speed of the capstan motor 12 and output the frequency-dividing pulse, a frequency-dividing ratio switching and controlling means 25 which temporarily switches a frequency-dividing ratio in accordance with a time delay and a servo control means 11 which controls the revolution speed of the capstan motor 12 by setting the frequency-dividing pulse as reference. The frequency- dividing ratio of the FG pulse is changed in accordance with the time delay of an absolute time between a master-side 1 and a slave-side 20, and the capstan motor 12 is decelerated or accelerated. Consequently, the capstan motor 12 can instantaneously and considerably be decelerated or accelerated by considerably changing the frequency-dividing ratio. Thus, synchronization can speedily be performed.</p> |
