Magnetic head adjustment mechanism

Details Magnetic head adjustment mechanism Magnetic head adjustment mechanism

1978-04-25

1980-01-22

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360105, 360109, G11B 5012, G11B 548

Patent

active

041853091

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: 2530584 (1950-11-01), Pontius
patent: 2859084 (1958-11-01), Raddin
patent: 3154372 (1964-10-01), Kolm
patent: 3500363 (1970-03-01), Shill
patent: 3581651 (1970-06-01), Keeney
patent: 4054931 (1977-10-01), Bolton et al.

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