| 摘要 |
PURPOSE:To improve operation efficiency and to improve positioning accuracy by driving a driven body coarsely and finely with a coarse handle and a fine handle. CONSTITUTION:A driving gear and a driven gear comprise a combination of a worm and a worm wheel 11, wherein the worm 5 is turned by turning a coarse handle 1, a driven body mounted on a screw rod 12 is quickly displaced, and the worm 5 is axially slid by turning a fine handle 8 to rotate the worm wheel 11 for a very small amount and drive the driven body finely. Thus, coarse drive and fine drive can be accomplished at any position of the total stroke of the driven body, so that the driven body is driven quickly near the positioning position to improve efficiency and finally high positioning accuracy can be obtained by fine drive. |
