| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw-fluid operated servo jack device which is used for a press machine requiring a high speed with low thrust and high thrust with a low speed and which has a screw cylinder and a fluid cylinder combined to be operated with a motor without using a power unit consisting of a pump and a control valve, having a longer life and requiring a shorter working time as a whole by making a move-up speed faster than a move-down speed. SOLUTION: The servo jack device comprises a body 2, a motion converting means 3, an input shaft 4, an output shaft 5, a first piston 6, a first fluid chamber 7, a second piston 8, a second fluid chamber 9, a third fluid chamber 10, a third piston 11, a fourth fluid chamber 12, a first passage 13, a second passage 14, a third passage 15, a first selector valve means 16, and a second selector valve means 17. In particular, there are provided the first-third passages 13, 14, 15, the fourth fluid chamber 12 and the first and second selector valve means 16, 17. COPYRIGHT: (C)2006,JPO&NCIPI
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