| 摘要 |
PURPOSE:To improve the accuracy of centering, by forming a spindle shaft by a cylindrical member made of an elastic member where the diameter is extended and shrinked freely. CONSTITUTION:When a pressing member 4 descends in the direction of arrow A, the member 4 is inserted along a taper 3b of a spindle shaft 3a to deform elastically the spindle shaft 3a so that the inner diameter is increased as shown in arrow B. In this case, the spindle shaft 3a is deformed elastically uniformly toward the outer side and the accurate centering is attained around the spindle shaft 3a, in contact with the outer circumference of a center hole 1a. |
