| 摘要 |
PCT No. PCT/JP92/01490 Sec. 371 Date Dec. 28, 1994 Sec. 102(e) Date Dec. 28, 1994 PCT Filed Nov. 13, 1992 PCT Pub. No. WO93/09911 PCT Pub. Date May 27, 1993A feed screw apparatus comprises a fixed member, a feed screw shaft rotatably supported to the fixed member, a nut mounted to the feed screw shaft and a movable member attached to the nut, wherein a force is transferred from the fixed member through the feed screw shaft and the nut, and the device comprises an elastic member elastically deformable in the axial direction and provided with a portion through which a force is transferred. A force can be detected by an elastically deformed amount of the elastic member. Further, an axially expandable and contractable portion is formed by arranging a displacement generator in parallel with the elastic member, and by elastically deforming the elastic member, the precise and fine displacement can be generated. Furthermore, a preload to be applied to balls of the nut is made adjustable by utilizing the axially expandable and contractable portion.
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