| 摘要 |
A short-slide positioning table employs precision grooves machined in opposed edges of a slide thereof for receiving preloading forces applied thereto through bearings from similar opposed grooves in arms of a U-shaped frame of a positioning table. A bearing guide moves bearings released from the downstream end of the slide to a bearing-return tube for return to the upstream end of the slide where they are again captured. Tapered transition regions at each end of each groove in the slide permit easy release and capture of the bearings. In one embodiment of the invention, a force-relief portion is disposed between two contact portions of the groove in the slide. The force-relief portion is set back from the contact portions a sufficient distance to reduce preloading forces in these regions to about zero. Tapered transition regions are provided between the contact portions and the force-relief portions.
|
