| 摘要 |
A floppy disc drive which is constructed so that when a record disc is inserted into the unit, the disc actuates a microswitch to energize an electric motor. The energized electric motor causes a central hub abruptly to start, and this action causes a coaxially mounted inertial disc to shift angularly with respect to the hub to release an eccentric spring-loaded centering pin. The released centering pin extends through the central hole of the record disc adjacent to the rim of the hole, and as the hub makes its first turn, the pin rides around the rim and serves to center the disc precisely with respect to the axis of rotation of the hub. After the hub has made a single turn, and the record disc has been centered, a solenoid is automatically energized which clamps the disc against the hub and which also resets the centering pin. The hub then continues to rotate and it turns the record disc about the axis of rotation of the hub, and data is written on or read from the record disc by an appropriate read/write magnetic head. The head is moved radially in steps as the disc turns, so that it is caused to follow a concentric path across the face of the disc. A second solenoid is energized to cause the disc to be pressed against the active face of the magnetic head. At the end of the operation, the second solenoid is de-energized to release the disc from the head, and the first solenoid is de-energized to cause the record to be automatically ejected from the unit.
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