Magnetic disc apparatus

Details Magnetic disc apparatus Magnetic disc apparatus

1983-06-17

1984-08-14

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360133, G11B 5012, G11B 2504

Patent

active

044660316

ABSTRACT:
A floppy disc has a disc holder provided at the center of a disc-shaped recording medium. The disc holder is formed of a magnetic material and has a central bore at its center. A rotating member has a cylindrical rotating shaft portion and a flanged portion and has a cylindrical bore at its center. A center spindle has a base portion slidable within this cylindrical bore and an engaging portion engageable with the central bore. A rotating shaft of a motor is fitted into the cylindrical bore, whereby the rotating member is driven to rotate by the driving operation of the motor. A compression spring is mounted between the center spindle and the rotating shaft, whereby the center spindle is urged by this compression spring in a direction permitting the engaging portion to protrude from the rotating member. The disc holder and the rotating member are fixed to each other by the magnetic force. In this state, the engaging portion engages the central bore, and thus, the center of the floppy disc is brought into alignment with the center of the rotating member.

REFERENCES:
patent: 4224648 (1980-09-01), Roling
patent: 4320425 (1982-03-01), Hall
patent: 4358803 (1982-11-01), Van der Giessen
patent: 4391543 (1983-07-01), Elsing

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