| 摘要 |
An apparatus is disclosed for centering one or more magnetic discs on a rotatable spindle. The apparatus includes a disc-carrying hub having a circumferential collar, a central housing supporting a centering ball, and a diaphragm joining the collar and housing, stiff in the radial direction but allowing axial movement of the centering element with respect to the collar. The hub is attracted to a rotatable spindle by an annular permanent magnet mounted on the spindle opposite a similarly sized armature mounted on the hub. A cup formed in the spindle at its center receives the centering ball and guides it to the center of the spindle as the hub is attracted to the spindle. After the centering ball is seated in the center of the cup, the diaphragm flexes to allow continued axial movement of the collar to full engagement with the spindle. A second embodiment of the apparatus is a tool for centering a disc pack on a spindle, wherein shoulder screws extend through the tool and threadedly engage the spindle, to provide a hub-spindle attractive force in lieu of the magnet. |
