Photocopying – Projection printing and copying cameras – With focusing or projection screen
Patent
1978-09-05
1981-08-11
Hix, L. T.
Photocopying
Projection printing and copying cameras
With focusing or projection screen
355 51, 355 57, 355 77, G03B 2748
Patent
active
042831369
ABSTRACT:
The microfiche reader printer has multiple format capabilities. A lens support holding one lens for each format is slidable to position a lens into the light path. Positioning of the lens support closes or opens switches which direct a logic circuit to cause a controller to drive the microfiche holding platen in a certain manner dependent on the format. Copying utilizes a rotating xerographic drum. The platen is driven by stepper motors having a digitized sinusoidal input for microstepping drive for constant velocity drive during copying where the movements of the platen and the drum must be coordinated. The platen also takes a half frame back step before printing so that it can accelerate forward over the half step forward to reach constant velocity during scanning of the frame.
REFERENCES:
patent: 3677637 (1972-07-01), Van Auken et al.
patent: 3713737 (1973-01-01), Suzuki et al.
patent: 3988064 (1976-10-01), Sone et al.
Herrod Don W.
Marsh James M.
Swift William R.
AM International Inc.
Brady W. J.
Curfiss R. C.
Hix L. T,.
Hulse Robert S.
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