JPS6455811A - Electromagnet device - Google Patents

Abstract

PURPOSE:To realize a reduction in a noise without restriction, such as a reduction in the displacement of an armature by providing a spring reversely to the operating direction of an armature on the way of contacting operation of a spring load at the time of elastic engagement and perpendicularly to the operating direction of the armature at the contacting position of the spring load, near the contacting or separating end face of a yoke. CONSTITUTION:When a coil 2 of a nonexciting state or a separating position is energized, the magnetic fluxes of a permanent magnet 5 and the coil 2 cancel each other to be superposed to rotate an armature 3 clockwise, and the vicinity of the top 6d of an engaging part 6a is brought into contact with the contacting face Ta of the armature and an edge P formed at the outer face 3e on the way of contacting operation. Accordingly, the spring force F1 of a spring 6 operates reversely the armature 3 to the operating direction to decelerate the operating speed of the armature 3. Further, when the armature 3 is rotated, the top 6d of the engaging part 6a of the spring is disposed on the outer face 3e, and the contacting face Ta of the armature 3 is attracted to the end face Ea of a yoke 1, and the contacting face Ta of the armature 3 is attracted to the end face Ea of a yoke1. The spring force F2 of the spring 6 operates the armature 3 at this contacting position perpendicularly to the operating direction. Accordingly, the influence to the attracting force property becomes extremely small in this state.