| 摘要 |
An apparatus for grinding a disk having a center cup and a flat rim having a pair of opposite faces has a frame and an inner holder part rotatable relative to the frame about and displaceable on the frame along a holder axis and having a head formed with an outer holding face and with a central seat. An outer holder shaft rotatable relative to the frame and displaceable on the frame along the holder axis has an inner end turned toward the inner holder part and carrying a coupling in turn having an inner face and itself permitting biaxial movement between its inner face and the shaft. An outer holder part carried on the inner coupling face has a head formed with an inner holding face confronting the outer holding face and with a central projection engageable axially into the seat of the inner holder part. The inner and outer holder parts can be moved axially toward each other to clamp the center of the cup between the holding faces and to insert the outer-part projection into the inner-part seat. A gripper in the seat of the inner holder part engages the outer-part projection and pulls same axially into the inner part so that this the gripper can axially lock the holder parts together to clamp the disk center therebetween. Axially opposite grinding members are axially engageable with opposite faces of the disk rim as same is held in and rotated about the axis by the holder parts for grinding the opposite faces.
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