Incremental printing of symbolic information – Light or beam marking apparatus or processes – With record receiver or handling means therefor
Patent
1993-12-29
1995-04-25
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
With record receiver or handling means therefor
B41J 2435
Patent
active
054103380
ABSTRACT:
A method and apparatus is disclosed for adapting a low precision lead screw to perform in a high precision application by compensating for cyclical positioning errors that are produced by the lead screw. A stage assembly driven by a stepper motor is individually characterized and its inherent cyclical positioning error is stored in a memory device. The memory device is used to control a driving circuit that controls an operation of the stepper motor. The stepper motor is driven in a non-uniform manner that is complementary to a pattern of cyclical positioning errors in the stage assembly. As a consequence, a stage, driven by the lead screw, moves in a uniform manner. The system is disclosed in the context of a printer in which a receiver is driven at a uniform rate by an inexpensive low precision lead screw.
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patent: 3573849 (1971-04-01), Herriot et al.
patent: 4285012 (1981-08-01), Ohara et al.
patent: 4631551 (1986-12-01), Vergona
patent: 4757327 (1988-07-01), Henzi
patent: 4975714 (1990-12-01), Rose
Optical Calibration Improves Ball Screw Accuracy by Richard Korinek Machine Design, Apr. 6, 1989, pp. 177-179.
Jadrich Bradley S.
McCauley David K.
Eastman Kodak Company
Reinhart Mark J.
Sales Milton S.
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