Photocopying – Contact printing – Plural exposure stations or plural machines
Patent
1979-02-16
1980-02-26
Wintercorn, Richard A.
Photocopying
Contact printing
Plural exposure stations or plural machines
355 93, G03B 2704
Patent
active
041903609
ABSTRACT:
A contact reproduction apparatus for duplicating images formed upon a transparency onto a photosensitive material, including plural vacuum contact printers, the respective evacuation chambers of which are connected, in parallel manner, to a master vacuum holding tank, the interior of which is maintained at an extremely high state of evacuation by a high displacement vacuum pump capable of drawing a maximum end vacuum in excess of 29 inches of mercury. An extremely high evacuation potential is provided at each evacuation chamber by making the volume of the master holding tank significantly larger than the combined volumes of the respective evacuation chambers. When a desired reproduction is to be made at one or more of the printers, activation of an automatic vacuum control provided with each such unit applies this high evacuation potential to the respective evacuation chamber, rapidly evacuating the same and rapidly drawing the copy sheet and photosensitive material into intimate contact without the formation of distortional anomalies therebetween. Under automatic control provided at each printer, the photosensitive material is exposed while drawn into intimate contact with the transparency.
REFERENCES:
patent: 2916982 (1959-12-01), Caine et al.
patent: 3313225 (1967-04-01), Mears
patent: 3409363 (1968-11-01), Matthaes
patent: 3689153 (1972-09-01), Suzuki
Barfield, Jr. Charles R.
Cunningham Bruce B.
Lanman Lithotech, Inc.
Semmes J. Gibson
Wintercorn Richard A.
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