Patent ID: 6101364
Filing Date: 2000-08-08
Classification: G03G

Abstract:
A method for operating a printer or copier comprising 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; andin 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; andin 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 transfer printing transport path to the second printing unit for printing a second side of the printed sheet-shaped material; andin 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.