| 摘要 |
PURPOSE:To prevent a magnet from damage, in the captioned device arranged with the plastic magnet between a movable base and fixed magnetic pole plate, by forming a relief distance in specific length between the magnet and metal bush housed in the magnet. CONSTITUTION:The captioned device is generally constituted such that a plastic magnet 11 is arranged between a movable base 12 and fixed magnetic pole plate 7, and each of the members 7, 11, 12 is combined as an integral unit by fixing screws 13, 14 inserted into metal bushes 15, 16 of non-magnetic material. In this case, a resin state elastic member 18 is interposed between the periphery of one of the metal bushes, for instance, the metal bush 15 and internal periphery of a housing part 17 of the magnet 11 housing the bush 15. This elastic member 18 is formed by rubber, baked and fixed to an internally peripheral wall of the housing part 17 or the peripheral wall of the metal bush 15. Thickness l of said elastic member 18 is formed slightly larger than a difference of length of the displacement between in a maximum expansion state and maximum contraction state of the magnet 11. |
