| 摘要 |
PROBLEM TO BE SOLVED: To provide a telescopic cover device with improved durability capable of surely and inexpensively achieving a requirement on movement of high speed/high acceleration and deceleration for a movable cover forming a telescopic structure, preventing the generation of mechanical impact/noise. SOLUTION: A plurality of the movable covers 9, 10 are relatively movably provided in a nested state between a projecting cover 7 fitted to a column 3 supporting a spindle head 2 and a fixed cover 8 erected from a prescribed position on a base. A male screw bar 11 rotationally driven by driving force of a servo motor 18 for the cover is horizontally disposed at the rear side of the column 3, and is provided with a male thread part 12a with a large pitch and a male thread part 13a with a small pitch. Each of the movable covers 9, 10 and each of the male thread parts 12a, 13a are connected thorough female screw bodies 14, 15 or the like so as to individually correspond to each other. COPYRIGHT: (C)2004,JPO
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