| 摘要 |
PURPOSE:To center and fix a disc precisely by pressing the disc on a placing table through a taper part on the peripheral part of a centering hub. CONSTITUTION:In case of placing the disc 8, the upper periphery (f) of an initial positioning hub 11 is inserted into the center hole of the disc 8 at first. The initial positioning hub 11 is prevented from upper sliding by a stopper 12, the pressing force by a push-up spring 10 is not applied to the disc 8 and the disc 8 is uniformly contacted to a turn table 2 by its own weight. The turn table 2 fixes a magnet 9 magnetically attracting the centering hub 3, and when the centering hub 3 is magnetically attracted by the magnet 9, the disc 8 is pressed to the turn table 2 through the taper part (a) of the centering hub 3 to center and fix the disc 8. |
