| 摘要 |
PURPOSE:To eliminate the need for a special pre-load mechanism by conventional pre-load plate and spring by disposing moving pieces to traveling guides and a pre-loading magnetic attraction means to one traveling guide. CONSTITUTION:With a magnetic attraction means 4, a magnetic unit in which magnetic poles 42, 43 are stuck integrally is mounted and fixed into a recessed section 18, aligning N and S magnetic poles for a permanent magnet 41 in the direction of traveling of a moving piece 3, and magnetic paths are formed among the N pole and S pole 41 and the end surfaces of both magnetic members 42, 43 and the moving piece 3. The moving piece 3 is pre-loaded to a traveling guide 16 at predetermined pressure at all times by suction force by the magnetic attraction means 4 disposed to the guide 16, and the guide 16 is made stably to travel as a traveling reference guide.
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