| 摘要 |
PURPOSE:To aim at the absorption of assembling errors in parallelism between a yoke or a shaft and a screw, by insetting a nut screwed in the screw in a hole of a movable bracket free of playing motion in a direction orthogonal with a shaft center of the screw. CONSTITUTION:A clearance 21 is formed between a nut 15 and a hole of a movable bracket 15 in a direction orthogonal with a shaft center of the nut 15, and this nut 15 is inset in the movable bracket 14 free of playing motion within the range of this clearance 21. In consequence, even if there are some errors in parallelism between a yoke 4 or a shaft 13 and a screw 7 as well as in manufacturing and assembling work, these errors are absorbed by the clearance 21, thus movement of the movable bracket 14 along the screw 7 is made smoothable enough. |
