Position shift apparatus

Details Position shift apparatus Position shift apparatus

1979-11-29

1982-01-26

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360106, G11B 555, G11B 2110

Patent

active

043131417

ABSTRACT:
A position shift apparatus having an actuator section for moving up and down a magnetic head through a screw feeding, and a control section in which, when the screw feeding is made in the up direction, it is made by a given distance up to target position and, when in the down direction, it is made beyond the target position, and then is again made by the distance exceeding the target position in the up direction. Even if the head is positioned on either the lower or the upper side, the head is screw-fed toward the target position always in the up direction.

REFERENCES:
patent: 4000518 (1976-12-01), Stearns
patent: 4020506 (1977-04-01), Barrett et al.
patent: 4144549 (1979-03-01), Burdorf et al.
patent: 4210959 (1980-07-01), Wozniak
IBM Tech. Disc. Bull., D. S. Proper, Accurately Positioning Transducers with Respect to Rotating Disks, vol. 18, No. 7, Dec. 1975, p. 2066.
IBM Tech. Disc. Bull., F. G. Anders, Software-Hardware Dual Mode Servo, vol. 20, No. 1, Jun. 1977, pp. 63-64.

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