| 摘要 |
A thrust converter has a connection pipe 30 for outputting reciprocating motion of first rotation/reciprocation conversion means 115 and a joint nut 28. The joint nut 28 is interposed between the first rotation/reciprocation conversion means 115 and the connection pipe 30, connected to the first rotation/reciprocation conversion means 115, and coupled to the connection pipe 30 with a screw. The thrust converter is constructed such that connection pipe 30 is driven by a second servo motor 31, thereby setting an arbitrary position where the joint nut 28 and the connection pipe 30 are to be coupled together. As a result, there is obtained a thrust converter which can shorten the axial length of the thrust converter in comparison with a required stroke, which obviates a necessity for operating two motors synchronously when a workpiece is fed to a gripping position or the like, and which facilitates motor control. <IMAGE> |
