| 摘要 |
PURPOSE:To reduce the change ratio of action forces of a rod at the slide start and finish by a method wherein nonexpansible compressed elastic bodies are inserted between a fixed, each floating and a movable coil which are respectively adjacent to each other, and magnetic lines of force are formed in the respective coils in the same direction. CONSTITUTION:The floating coils 5 are guide-supported on the inner periphery of a casing 2 and also guide-supported by the rod 1. The nonexpansible compressed elastic bodies 7 such as compression coil springs are inserted between the fixed coil 3, the individual floating coils 5 and the movable coil 4 respectively adjacent to each other. Further, the fixed coil 3, individual floating coils 5 and movable coil 4 are connected with electric lines, the magnetic lines of force respectively being adapted to be formed in the respective coils in the same direction as the casing axis, and make-and-break switches are provided in the electric lines to control interruption and commutation of an exciting current. Thereby, the change ratio of the action forces at the starting end and finishing end of a stroke motion can be reduced. |
