Importance

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Abstract

The invention relates to an apparatus for generating proofs of print signatures composed of first and second flats printed on opposite sides of a sheet comprises first and second digital printing units; a feeder mechanism for feeding a substrate having opposite sides to the first printing unit; a first input for feeding to the first printing unit digital data representative of an image of the first flat to imprint one side of the substrate with the image of the first flat; a marker for providing the substrate with a registration mark at a predetermined location on the substrate; a conveyor for conveying the imprinted substrate from the first printing unit to the second printing unit and feeding same thereto; and a mark sensor for detecting the location of the registration mark on the substrate and causing actuation of the second printing unit. The apparatus of the invention further includes a second input for feeding to the second printing unit digital data representative of an image of the second flat to imprint the other side of the substrate with the image of the second flat positioned with respect to the detected location of the registration mark such that the image of the second flat registers with the image of the first flat, thereby obtaining a proof of a print signature; and an outlet for discharging the proof of print signature from the second printing unit. Such an apparatus enables one to avoid generating films from the digital data representative of both flats and preparing a proof from such films.

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First Claim