Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1984-10-23
1986-07-08
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318603, 318611, 318640, 318591, G05B 1118
Patent
active
045995478
ABSTRACT:
A system and method are disclosed for precisely positioning a movable member to a desired fine position after a selected coarse position is reached. In a preferred embodiment of the invention a processor-controlled typewheel servo control system is responsive to a command signal for a selected coarse position for selectively utilizing from a memory circuit preselected stored adjustment information for the selected coarse position comprised of an associated coarse position count and quadrant information related to the sinusoids generated by an optical encoder in order to make a precise fine position adjustment in the position of a typewheel after the selected coarse position is reached for that typewheel.
REFERENCES:
patent: 3573589 (1971-04-01), Berry
patent: 3644814 (1972-02-01), Firkert
patent: 3670228 (1972-06-01), Crosby
patent: 3710223 (1973-01-01), Cottiell
patent: 3976929 (1976-08-01), Rodier
patent: 4134053 (1979-01-01), Klinger
patent: 4219766 (1980-08-01), Lin
patent: 4345192 (1982-08-01), Kohzai et al.
patent: 4353019 (1982-10-01), Sweeney
patent: 4429267 (1984-01-01), Veale
Hawk Jr. Wilbert
Keane Patrick C.
NCR Canada Ltd-NCR Canada LTEE
Sessler Jr. Albert L.
Shoop Jr. William M.
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