| 摘要 |
PROBLEM TO BE SOLVED: To enable back-lash in braking operation when a brake is applied to be restricted and at the same time to reduce the number of component parts.SOLUTION: There is provided an electromagnetic magnet for controlling a motion of a plurality of brake shafts. The electromagnetic magnet has a movable iron core connected to one brake shaft and a stationary iron core connected to the other brake shaft. An exciting coil for retracting the movable iron core is mounted on the stationary iron core, and a brake shaft insertion hole and a spring insertion hole are formed. An axial one end of one brake shaft is movably inserted into the brake shaft insertion hole and a brake spring is inserted into the spring insertion hole in such a way that it can be extended or shrunk. A part of a spring seat stored in the spring insertion hole is fixed to the brake spring. The movable iron core is formed with a spring seat insertion hole. The spring seat is, at its one end side, fixed to the brake spring, the other end is inserted into the spring seat insertion hole and engaged with it. The brake spring applies a spring force acting in such a direction as one moving away from the stationary iron core against the movable iron core through the spring seat. |
