| 摘要 |
A spinstand having a vacuum chuck clamping mechanism for securing magnetic discs includes a cap ( 9 ) and a base ( 10 ). A disk-to-be-clamped is held between the cap ( 9 ) and the base ( 10 ). Vacuum, applied through a port ( 4 ) in a mounting screw ( 12 ) of the base, provides the clamping force. The vacuum is held constant using a circumferential seal ( 27 ) on a piston ( 2 ) of the cap, which extends into a cylindrical countering bushing ( 3 ) extending from the base. In one form, the cap ( 9 ) is centered about a spin axis (SA) extending through the base ( 10 ), using a hardened pin ( 1 ) extending from the cap and a locating bushing ( 19 ) affixed to the base. When the cap ( 9 ) is inserted into the base ( 10 ), the pin ( 1 ) prevents a piston ( 2 ) in the cap from contacting the inside walls/sealing surface ( 11 ) of the centering bushing ( 3 ) of the base. To remove the cap, positive air pressure is applied to the air passage ( 4 ), collapsing the seal ( 27 ), and forcing the cap ( 9 ) out of the base ( 10 ) without causing wear on the seal ( 27 ) or the sealing surface ( 11 ) of the centering bushing ( 3 ).
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