Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1974-11-15
1976-10-12
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318603, 318681, G05B 1118
Patent
active
039860914
ABSTRACT:
An apparatus for positioning a carrier means along a line of print in either of two directions. The carrier means is positioned by a D.C. motor which is driven by a pair of current driver circuits, one of which controls the flow of drive current in a forward direction and the other of which controls the flow of current in the reverse direction. The motor is capable of driving the carrier means at a first predetermined high speed when it is determined that the desired destination carrier position is more than a predetermined number of carrier positions from the present carrier position and at a second predetermined low speed when the desired destination carrier position is less than or equal to a predetermined number of carrier positions from the present carrier position. An electronic tachometer means operates to maintain a relatively constant speed while operating in the predetermined high speed state and while operating in the predetermined low speed state. Logic means, including a state machine, operates to insure a smooth and rapid transition from the high speed state to the low speed state so that said carrier means is accurately positioned at the desired destination carrier position in a smooth and efficient manner without damage to machine parts or excessive noise.
REFERENCES:
patent: 3206665 (1965-09-01), Burlingham
patent: 3209338 (1965-09-01), Romvari
patent: 3306416 (1967-02-01), Dahlin et al.
patent: 3427520 (1969-02-01), Oppendahl
patent: 3668500 (1972-06-01), Kosem
patent: 3670228 (1972-06-01), Crosby
patent: 3710222 (1973-01-01), Dummermuth
patent: 3721882 (1973-03-01), Helms
patent: 3731177 (1973-05-01), Commander et al.
patent: 3835360 (1974-09-01), Kiwiet
B368,397, Jan. 1975, MacWade et al., 318/561.
Eldert Cornelius
Quiogue Virgilio J.
Worst John L.
Burroughs Corporation
Dobeck B.
Fissell, Jr. Carl
Padgett, Jr. Charles P.
Redman Leon E.
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