| 摘要 |
PURPOSE:To prevent a quick return mechanism from being effected by motor performance and lead of ball screw by providing a slide block coupled to an actuator so as to move coaxially with a screw nut unit and having a work lifting claw. CONSTITUTION:A ball screw 8 receiving rotating drive and moving vertically and a screw nut unit 18 guided by a guide shaft 24 in parallel with the ball screw 8 and elevating while being restrained by the ball screw 8 are provided. And a slide block 26 having a work lifting claw 31 and an actuator 30 elevating the slide block 26 independently from the screw nut unit 18 are provided. By this construction, a quick return mechanism is not effected by motor performance and ball screw 8.
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