Photocopying – Projection printing and copying cameras
Patent
1978-05-02
1979-12-04
Gonzales, John
Photocopying
Projection printing and copying cameras
355 29, 355 41, 250557, 226 33, G03B 2752, G06K 7015, B65H 2318
Patent
active
041769449
ABSTRACT:
Each original has a notch. A notch detector is located a distance Z upstream of the point at which the notch centerline is later to be stopped, and generates a notch-start and a notch-end pulse. A transducer generates strip-increment pulses during strip transport. In response to a notch-start pulse first and second counters start counting the strip-increment pulses, the first counting the Z distance, the second counting the notch length N. A divider ascertains the notch half-length N/2, which is then stored. When the counting of the Z-distance is finished, strip transport is not immediately stopped, and instead is stopped only after the counting of a further number of strip-increment pulses corresponding to the length N/2, whereupon transport is stopped. This references the system to the reliable centerlines of variable-length notches, instead of the leading ends of the notches, and assures correct positioning when transport is stopped.
REFERENCES:
patent: 3148585 (1964-09-01), Armstrong et al.
patent: 3614455 (1971-10-01), Paulus
patent: 3874791 (1975-04-01), Thieme et al.
patent: 3963937 (1976-06-01), Inoue et al.
AGFA-Gevaert A.G.
Brady W. J.
Gonzales John
Striker Michael J.
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