| 摘要 |
PURPOSE:To eliminate looseness of a rotary table and improve its supporting accuracy even for the table at an optionally sloped angle, by locking radial and thrust directional movement in rotation of the rotary table through rolling bearings and supporting the rotary table with said rolling bearings. CONSTITUTION:A rotary table 9 is secured to a center shaft 16, and the shaft 16 is turnably supported by a pair of conical rolling bearings 17, 18. Then a collar 23, combined for use of action of an adjusting shim, is interposed between the shaft 16 and the table 9 as an adjusting means of rolling surface clearance, between the bearings 17, 18, by adjusting the gap dimensions L between inner rings of the bearings 17 and 18. While a table driving gear 19 is secured to the shaft 16 by a fixed ring 20, and the inner rings of the bearings 17, 18 are held between an upper side of the gear 19 and lower side of the table 9. Accordingly, thickness of the collar 23 is decreased, if a bolt 24 is tightened, the rolling surface clearance of the bearings is decreased to zero, and looseness of the shaft 16 can be eliminated. |
