PURPOSE: To moderate collision velocity to a stopper for a plunger as well as to improve the extent of quietness by installing a sensor detecting a position of the plunger during its stroke, and cutting any current-energization to a solenoid on the basis of output of the sensor.
CONSTITUTION: A manual switch 10 is operated to the lock side or the unlock side and thereby a lock timer 20 or an unlock timer 21 is operated, then a plunger 51 for door lock use is driven via a solenoid 50. At this time, a current- energization cutting timer 22 is operated on the basis of output from a position detecting sensor 70 detecting a position of the plunger 51 during its stroke and, after the elapse of the preset time, current-energization to the solenoid 50 is cut off. With this constitution, speed at the closing period of actuation of the plunger 51 is decreased, so that an operating noise at a collision to a stopper can be made smaller.
YOSHIDA MAMORU
DEO TAKASHI
KITAMI AKIO
