Importance

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Abstract

A method for operating a printer or copier is disclosed. The method includes the following steps: supplying sheet-shaped material individually in succession through an input section to a first printing unit; printing an image pattern onto a sheet-shaped material with the first printing unit; sending the printed sheet-shaped material individually in succession from the first printing unit through an output section; supplying sheet-shaped material individually in succession through the input section to a second printing unit; printing an image onto the sheet-shaped material with the second printing unit; sending the printed sheet-shaped material individually in succession from the second printing unit through the output section; and in a simplex operating mode, alternating the supplying of sheet-shaped material to the first and second printing units by switching a first shunt disposed in the input section; and in a duplex operating mode, supplying printed sheet-shaped material, with printing disposed on a first side thereof, from the first printing unit through a first transfer printing transport path to a connecting channel to the second printer for printing transport path to the second printing unit for printing a second side of the printed sheet-shaped material; and in an emergency operating mode, wherein one of the first or second printing units is malfunctioning, shutting off the malfunctioning printing unit and switching the first shunt to supply sheet-shaped material only to the non-malfunctioning printing unit.

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First Claim