| 摘要 |
PURPOSE:To measure the quantity of abrasion easily with high precision by fixing a nut which is engaged threadably with a screw shaft to the nearly center part of a leaf spring, and putting the clearance between the nut and screw shaft close in one direction and returning the leaf spring to a neutral point. CONSTITUTION:An instrument is equipped with a screw shaft supporting device 2, a screw shaft rotary driving mechanism 3, a screw shaft rotational angle detector 4, a base 5, etc. Then, the nut 34 is engaged threadably with the screw shaft 9 and then fixed to the nearly center part 6a of the leaf spring 6 whose both ends are fixed to the base 5. The shaft 9 is rotated in one direction to move the nut 34 in one direction and thus the spring 6 is inflected in one direction to make a pressing force operate on the shaft 9 from the nut 34; and the shaft 9 is rotated in the opposite direction to move the nut 34 in the other direction and the spring 6 is returned to the neutral state and then inflected in the other direction. Simultaneously, the angle of rotation of the shaft 9 and the extent of movement of the nut 34 are detected and recorded. The axial clearance of a ball screw 43 is measured from the length of a blind sector wherein the nut 34 stops moving against the rotation of the shaft 9 while the spring 6 is in the neutral state.
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