Electro-magnetic device

Abstract

A magnet section is constructed by installing a coil (2) on a yoke (1), and an armature (3) is placed facing the attracting surface of this magnet section. Indentations and projections are formed to confer the characteristics of both an opposing type electromagnet and a plunger type electromagnet on the magnetic path portion that faces yoke (1) and armature (3). By doing this, the attractive force characteristics will be uniform, and the operating speed and the holding position of the armature can be set as desired by adjusting the magnetization. Thus, the force of impact can be lessened by deceleration control of the armature, and the impact noise can be reduced. In a further aspect, a thin, single sheet annular, noise-damping waveform spring (6) is attached to the outer edge of the attracting surface of the magnet's yoke (1) or armature (3). This waveform spring (6) provides the armature (3) or yoke (1) with projecting sections and it is held so that the inner circumferential surface will be in contact with it. A braking spring (5), which provides braking force to the armature (3), is installed on the magnet portion. Support rods are attached to the yoke (1) and armature (3), and the middle attached section is joined by arms (41) and (42), held to turn freely with a support shaft, and pins. Linings (44) and (45) are attached in the forward end sections of arms (41) and (42) to sandwich the rails of the object being stopped. The force of impact during attraction is absorbed by the cushioning action of waveform spring (6), and the impact noise is greatly reduced.