Photocopying – Contact printing – Machine
Patent
1990-05-24
1991-12-17
Brown, Brian W.
Photocopying
Contact printing
Machine
355103, G03B 2704
Patent
active
050737929
ABSTRACT:
The present invention relates to a machine for facilitating the continuous exposure of laminar photosensitive materials placed in contact with original films. The machine includes a planar slit through which the photosensitive materials are guided, the slit being defined by a rigid planar plate of light-transparent material which is superposed on a flexible supporting and sliding surface and acts thereon with a predetermined force to ensure the contact of the photosensitive materials. Light-emitting devices are further located beyond the plate on the side opposite to the supporting surface, and at least one pair of motorized conveyor rollers is arranged upstream of the inlet of the guiding slit for continuously advancing the photosensitive materials. The face of the plate which is directed toward the guiding slit has a uniform distribution of optically transparent surface discontinuities which are adapted to prevent the formation of a vacuum and to avoid the adhesion of the contact surfaces of the films with the face of the plate. The supporting surface includes an at least partially inelastic pad which automatically adapts to the shapes and thicknesses of the photosensitive materials. The conveyor rollers have rigid cores with soft elastic coverings and are mounted on fixed supports which are optionally adjustable to change a center-to-center distance strictly smaller than the each outer diameter thereof.
REFERENCES:
patent: 4566787 (1986-01-01), Lullau
Brown Brian W.
Dang Khanh
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