Cross band coupling for stepper-motor-driven, rigid magnetic dis

Details Cross band coupling for stepper-motor-driven, rigid magnetic dis Cross band coupling for stepper-motor-driven, rigid magnetic dis

1978-04-24

1979-08-14

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 97, G11B 548, G11B 554, G11B 1700

Patent

active

041647696

ABSTRACT:
An open loop, stepper-motor-driven, rigid magnetic disc memory apparatus for use with a data processing system. A rigid magnetic disc with high track density is driven by a stepper motor in an open-loop fashion or without servomechanism control. The memory apparatus includes: band structure including a spring bias for coupling stepper motor drive to apparatus supporting magnetic heads above and/or below the spinning disc and for temperature compensating for disc/apparatus expansion and contraction; manually operable control for zeroing the magnetic heads, moving and locking them in the disc's landing zone as, for example, while in transit, and providing a travel limit to head movement when the memory apparatus is operating; keying apparatus for preventing erroneous insertion and mis-alignment of and damage to an optical transducer relative to an optical mask arranged to spin with the disc structure; shim apparatus for precisely positioning the magnetic heads in the spin axis direction; viscously-coupled inertia apparatus for damping the stepping motor's step-rotary motion; a device for employing spinning motion associated with the disc for cooling purposes; and other structure.

REFERENCES:
patent: 3199092 (1965-08-01), Hoffman
patent: 3500363 (1970-03-01), Shill
patent: 3609721 (1971-09-01), Meneley
patent: 3859662 (1975-01-01), Habich et al.
patent: 3864749 (1975-02-01), Stansell
patent: 3946439 (1976-03-01), Castrodale et al.
patent: 4071866 (1978-01-01), Butsch
patent: 4123675 (1978-10-01), Moskowitz et al.

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