Burn-out frame for a copy print machine

Details Burn-out frame for a copy print machine Burn-out frame for a copy print machine

1988-09-27

1990-03-13

Hix, L. T.

Photocopying

Projection printing and copying cameras

Detailed holder for original

355 91, G03B 2762, G03B 2764

Patent

active

049086588

ABSTRACT:
The present invention describes a burn-out frame for a copy print machine, comprising a support table on which a film or a printing plate is intended to be mounted, and a copy print frame having exposure light for providing a print of one and the same original film or a series of different original films onto the film or printing plate, and in which the print frame comprises a frame having a transparent glass plate (11), which at the bottom surface thereof is formed with at least one downwardly opening groove (12, 14) for vacuum connecting an original film (13) and eventually a masking film (15), and one or more bores and/or channels (16, 17) opening in said groove (12) for connecting the vacuum groove(s) (12) to a source of sub-pressure, and in which part (19) of the print frame glass corresponding to the largest image area of the original film (13) is clear, and parts (18) of the transparent plate located outside said largest image area are diffused.
In order to prevent refractions of light resulting from the vacuum grooves and the bores from falling onto the film or printing plate while at the same time allowing a non-image area of said film or printing plate to be exposed or burnt out.

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