| 摘要 |
PURPOSE:To enable a motor to be exactly started, by increasing current fed to the motor, for a given time from reversal starting. CONSTITUTION:When a start switch SS is turned ON, then contact points CP1 and CP2 are communicated with, and a sel-motor SM is positively operated. In the meantime, when a back switch BS is turned ON, then contact points CP5 and CP6 are communicated with, and a reversal circuit is formed. At the same time, the output of trigger signal TG is generated from an unstable multivibrator 1 in a specified cycle, and pulse signal RS for the length L of a set time T after the fall of the trigger signal TG from a single stable multivibrator 2 is applied to transistors TR7, TR8. After the back switch BS is turned ON and while a condenser C5 is not charged, the time T of the level L of the pulse signal RS is lengthened, and current fed to the sel-motor SM is increased.
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