Importance

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Abstract

A switchable permanent magnetic chuck of the type capable of detachably hold a magnetic work piece. The chuck comprises a frame structure with its top and bottom being open, a work supporting faceplate and a bottom plate to cover the top and bottom openings, respectively, of the frame structure, a plurality of stationary permanent magnets supported on the frame structure and a plurality of movable permanent magnets supported on a shiftable plate which is movably accomodated in the frame structure, and adapted to be operable in association with the stationary permanent magnets to bring the work supporting faceplate into a magnetized or demagnetized condition. In order to reduce the height of the chuck without reducing the magnetic power, permanent magnets having a high coercive force are used as the above-mentioned stationary and movable permanent magnets. The stationary and movable permanent magnets are, respectively, arranged so that their magnetization directions are alternately inversed along the direction of the arrangement of magnetic pole face portions of the work supporting faceplate in correspondence with the pitch of the magnetic pole face portions.

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First Claim