| 摘要 |
PURPOSE:To absorb a lead error of a ball screw shaft and improve rigidity of a drive system by boring arc-shaped elongated holes with the arc centered on the screw in a flange portion of a nut and fixing the nut to a bracket by means of bolts penetrating the elongated holes. CONSTITUTION:A ball screw shaft 1, with its both ends (p) and (q) shaft- supported on a machine body such as a head, is arranged to be rotated by means of a motor 3. Nuts 4 and 5 apart from each other are fitted on the ball screw shaft 1 while flanges 6 and 7 for fixing the nuts 4 and 5 are arranged projecting from a driven part 8 such as a table. Elongated arc-shaped holes 11 with the arc centered on the ball screw shaft 1 are bored in four positions in a flange portion of each of the nuts 4 and 5. The nuts 4 and 5 are fixed to the flanges 6 and 7 by means of bolts 9 and 10 penetrating those elongated holes 11. Accordingly, the nuts 4 and 5 can be fixed smoothly to the flanges 6 and 7. |
