Title: Magnetic head load control system

Abstract: A control system for applying a magnetic head onto a magnetic disk in random places thereon including a free running oscillator and switching means responsive to pulses from said oscillator and a head load command signal derived from the disk during a revolution thereof for initiating the energization of a head engaging solenoid. The system includes a capacitor which is charged at various rates to produce an initial fast rising current in the solenoid for moving the head into close proximity with the disk, a slowly rising subsequent current in the solenoid for engaging the head with the disk gradually, and a final fast rising current in the solenoid for completing the engagement of the head on the disk.

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Inventors: Lovgren, Jeffrey L. (Rochester, MN, US)
Quinlan, William P. (Rochester, MN, US)

Application Number: 938727
Filing Date: 1978-08-31
Publication_date: 1980-05-06
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Class(es): 360/75 360/254.1
Other Classes:
US Patent Ref:

3333065	Jul, 1967	Torok	360/105.
3491350	Jan, 1970	Linsley	360/103.
3641527	Feb, 1972	Gyl	360/105.
3751603	Aug, 1973	Prieur et al.	360/105.
4030132	Jun, 1977	Ifikar et al.	360/105.

Other Refs:
Primary Examiner: Tupper, Robert S.
Assistant Examiner:
Attorney: Bleuer; Keith T.