| 摘要 |
PURPOSE: To reduce vibration of this base board, and stably/linearly move a movable member by forming the base board to support a rack means joined to a geared belt out of a slab or a block of plastic concrete. CONSTITUTION: A slender bed slab 2 is formed of cast solid plastic concrete, this flat upper surface has a rack 3 formed by being cast on the slab 2, and this rack 3 extends in parallel to a side wall 4. Two parallel guide rails 5 are arranged on the side wall 4 of the bed slab 2, and a carriage 7 is arranged so as to be freely movable in the lengthwise direction on these guide rails 5. The carriage 7 is linearly moved along the guide rails 5 by rotating a geared belt wound round a roller 21 through a drum 18, a belt 16 and a gear 13 by driving of a motor 17 mounted on this carriage 7 while meshing with the rack 3. |
