Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1977-11-10
1979-04-03
Dobeck, B.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318603, 364519, G05B 1128
Patent
active
041479670
ABSTRACT:
An apparatus and method for controlling the velocity of a moving member like, for example, a print head carrier. A processor is utilized for controlling the velocity of the carrier with respect to a desired nominal velocity and for performing additional operations such as grouping of characters to be printed, firing print actuators, etc. associated with a printing function. The additional operations have predetermined associated time periods which are used in conjunction with successive signals from a timing strip associated with the carrier to produce a first count which corresponds to the actual velocity of the carrier. The first count is compared by the processor with a second count representing the desired nominal velocity of the carrier to determine underspeed and overspeed conditions, and, additionally, acceleration and deceleration conditions are determined and used in providing an output count which is utilized by a modulator for controlling an energizing "on period" and a deenergizing "off period" to a motor driving the carrier so as to minimize "undershoot" and "overshoot" of the carrier relative to the desired nominal velocity.
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patent: 3670228 (1972-06-01), Crosby
patent: 3828236 (1973-01-01), Close
patent: 3838325 (1974-09-01), Kobayashi
patent: 3889169 (1973-10-01), Hirschman et al.
patent: 3922671 (1974-06-01), Tripp
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patent: 3986091 (1976-10-01), Qulogue et al.
IBM Tech. Discl. Bulletin, "Grating Position Up Down Counter", Carmichael et al., vol. 16 #10, 3/74.
Cavender J. T.
Dobeck B.
NCR Corporation
Sessler Jr. Albert L.
Wargo Elmer
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