| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent load from applying to a bearing supporting a turntable to a base caused by an aligning action in connecting a curvic coupling by a simple structure. SOLUTION: A curvic coupling 108 which divides a turntable 23 supported to a base 20 via a bearing 101 at a prescribed rotation angle is provided with an annular first coupling member 109 fixed to the base, an annular second coupling member 110 connected to the turntable 23 via an elastic member 114, and an annular third member 111 provided in the base 20 so as to be raised/ lowered freely and having a possibility of engaged with the first and the second coupling members 109, 110. In engagement of the curvic coupling 108, even if the second coupling member 110 is radially moved in relation to the base 20 by its aligning action, the elastic member 114 is elastically deformed so as to prevent the load applying to the bearing.
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