| 摘要 |
PURPOSE:To restrain a recoiling phenomenon of a plunger by reducing attracting voltage to restrain acceleration of the plunger after applying a predetermined attracting voltage to a coil and applying again the attracting voltage just before the plunger collides with a stopper. CONSTITUTION:When signals are applied to an input terminal 11, transistors 21, 22 become conductive so that drive current I flows in a coil 1 and a plunger 3 is attracted and accelerated to the fixed magnetic pole 2 side. When the plunger 3 is displaced to a certain degree, the transistors 21, 22 are shut off to shut off the drive current I in the coil 1. Thus, the displacement speed of the plunger 3 is abruptly restrained by the braking force of a spring 7. When the plunger 3 advances just before it collides with a stopper 10, the transistors 21, 22 become again conductive to prevent recoiling of the plunger 3. |
