Printer with two printing units

A printer system, comprising:

• a first electrographic printing unit with which an image pattern can be printed on sheet-type material in a first transfer printing transport path;
• a second electrographic printing unit with which an image pattern can be printed on the sheet-type material in a second transfer printing transport path;
• an input section via which the sheet-type material can be supplied individually one after the other to both the first and second printing units;
• an output section via which the printed sheet-type material is individually ejected one after the other from both the first and second printing units;
• and
• a carry-off channel allocated to the second printing unit, said carry-off channel being constructed so that the sheet-like material printed on one side by the second printing unit is supplied again to the second printing unit for printing on a backside, and the sheet-type material that was printed by the first printing unit can be supplied to the output section via the carry-off channel in a manner that circumvents the transfer printing transport path of the second printing unit.

A printer system having a transport system for sheet-type recording media, comprising:

• a first shunt via which the sheet-type recording material can alternately be supplied to one of a transfer printing transport path of a first printing unit and, via a supply channel, to a transfer printing transport path of a second printing unit;
• a second shunt via which the sheet-type recording material that was printed by the first printing unit can alternately be supplied via a carry-off channel to one of an output section and a connecting channel;
• a third shunt provided at the connecting channel via which the sheet-type recording material coming from the connecting channel can alternately be supplied to one of the transfer printing transport path of the second printing unit and the supply channel;
• and
• a fourth shunt that supplies both the sheet-type material coming from the transfer printing transport path of the second printing unit and the sheet-type material coming from the carry-off channel to the output section.