Photocopying – Contact printing – With scanning
Patent
1980-07-14
1981-11-24
Hix, L. T.
Photocopying
Contact printing
With scanning
355 91, 355103, G03B 2710, G03B 2720
Patent
active
043021034
ABSTRACT:
A contact printer, for exposing light sensitive sheets to relatively large size drawings and the like for making accurate duplications, is formed of an endless, movable, support belt having a flat support surface which is overlapped by a movable transparent belt. The drawing and sheet are overlapped and fed between and move in a longitudinal direction with the two belts. The overlapping portions of the transparent belt, the drawing and sheet are all flattened and tightly clamped together against the flat support surface by a vacuum system. Such system includes closely spaced, transversely extending, grooves formed in the surface of the support belt. The grooves open endwise into longitudinally extending border portions which are formed along the side edges of the support belt. A row of holes through at least one of the border portions passes over a vacuum chamber. Thus, air is evacuated through the grooves and out through the holes to the chamber. A fixed position light source is arranged to shine light through the transparent belt to expose the portion of the light sensitive sheet material which is clamped to the moving support surface.
REFERENCES:
patent: Re28770 (1976-04-01), Zeunen et al.
patent: 2518208 (1950-08-01), Weiss
patent: 3687548 (1972-08-01), Yugoro
patent: 4212533 (1980-07-01), Zeunen
Brady W. J.
Hix L. T,.
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