| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple structure free from abrasion, capable of ensuring the correct and effective stickless elevating motion of a platform even in heavy load, by improving a device for compensating a threaded spindle stopper of a spindle driving device 1 for preventing the locking of the spindle driving device in elevating the platform 2. SOLUTION: The spindle driving device 1 has three rotatable axial threaded spindles G1, G2, G3, G4 mounted in a square while keeping the different or same radial bearing play FL F2, and comprising supporting members L1, L2, L3, L4, the supporting members L2, L3, L4 free from abrasion are mounted while keeping the radial plays F1; F2 for compensating the radial stoppers of the rotating threaded spindles, and the rotatable spindles can be relatively radially moved to the platform 2 with slight frictional force.
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