| 摘要 |
PURPOSE:To make a sun gear independent from an internal gear and liftable automatically with a simple structure, by installing the sun gear free of slide motion in the axial direction of a hollow shaft, while fitting an operating member, which is intermittently connected to a driving system rotably in this hollow shaft. CONSTITUTION:Feeding the head side of a piston 38 with compressed air, when this piston 38 and a fitting concavity of a feed nut 35 become opposed, the piston 38 goes down and is inserted into the inside of the fitting concavity 36 whereby a coupling 37 and the feed nut 35 are coupled together. With this constitution, the feed nut is rotated, motion in an axial direction is regulated, there is no reciprocation at all, whereby movement takes place only in a direction of rotation, therefore this movement comes to such force as turning a hollow shaft 19 via a feed screw 23a or it comes to reciprocation in the axial direction of the feed screw 23a by sliding with a fitting part with a key 32, but the side of force turning the hollow shaft 18 is too much so that it comes to reciprocating motion of the feed screw 23a, making a sun gear 23 go up and down automatically. Therefore, lifting of the sun gear can be automated, and there if no dislocation at a work and a carrier, thus operation comes easy. |
