| 摘要 |
PURPOSE:To surely and easily lock a disk and release disk chucking by using only a second elastic member at the time of locking the disk and removing the second elastic member, which is pressed onto a center core, in the transverse direction at the time of releasing disk lock after disk chucking. CONSTITUTION:When a disk is not used, a center core 11 is elastically pressed from above by only the elastic repulsion of a second elastic member 17 to lock the disk. In case of chucking of the center core 11 onto a disk table, the center core 11 is elastically pressed onto the disk table by the synthetic elastic repulsion of first and second elastic members 16 and 17 to chuck the disk. The first elastic member 16 is moved from the pressing position to the release position after chucking and the second elastic member 17 is removed in the transverse direction to release disk lock. Thus, disk lock and disk chucking are surely performed, and disk lock after disk chucking is simply and easily released.
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