| 摘要 |
An apparatus for data transfer with a magnetic disk having a metal made hub attached centrally thereto, with the hub having a first opening defined centrally therein and a second opening defined eccentrically therein. The apparatus includes a turntable which is mounted on a drive spindle and on which the magnetic disk is to be placed with the drive spindle engaged in the first opening in the disk hub. Arranged eccentrically on the turntable, a drive pin is engageable in the second opening in the disk hub for transmitting the rotation of the turntable to the magnetic disk. The drive pin is mounted on a leaf spring for retraction into the turntable when the magnetic disk is loaded thereon with its second opening out of register with the drive pin. The leaf spring has a first portion disposed on the forward side, with respect to a predetermined direction of the rotation of the magnetic disk with the turntable, of a notional line connecting the axes of the drive spindle and the drive pin, and a second portion disposed on the rearward side of the notional line. The deflection of the second portion of the leaf spring is made less than the deflection of the first portion of the leaf spring in order to prevent the slanting of the drive pin, and then to hold the magnetic disk and the turntable in a predetermined angular relationship to each other, during the rotation of the magnetic disk.
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