RAW MATERIAL HOLDING DEVICE, RAW MATERIAL GUIDE DEVICE, AND AUTOMATIC LATHE

摘要

A raw material holding device (10) has a tubular chuck (14) with a holding section (16) that can be opened and closed, an operation member (18) for opening and closing the holding section, and a drive mechanism (20) for moving the operation member between a closed position at which the holding section is made to hold a to-be-processed raw material (W) by pressing force and an open position at which the pressing force is removed to make the holding section release the to-be-processed raw material (W). The drive mechanism has a bidirectional drive member (62) for selectively applying drive force (F1) in normal direction and drive force (F2) in reverse direction to the operation member, the drive force (F1) in normal direction moving the operation member from the open position to the closed position, the drive force (F2) in reverse direction moving the operation member from the closed position to the open position. The above enables the following constructions to be selectively realized: a construction of a type that has a stationary-type chuck (14A) and in which the operation member is ejected and a construction of a type that has a movable chuck (14B) and in which the operation member is retracted. A raw material guide device (100) with a similar construction to the above is also provided.