Printing apparatus for printing on a print substrate

A method for operating a printing apparatus, the printing apparatus comprising:

• a printing station, an input station and an output station, the printing station comprising a printing assembly, wherein the output station comprises a carrousel, the carrousel being movable in a plurality of positions, the carrousel comprising at least two roll-up units, the method comprising the steps of:
• selecting one of the input station and the output station as the supply source and supplying a print substrate from the selected supply source to the printing station;
• providing a first image on a first side of the print substrate in the printing station;
• arranging the carrousel in one position of the plurality of positions, in which position a first roll-up unit of the at least two roll-up units is arranged in a substrate receiving position and a second roll-up unit of the at least two roll-up units is arranged in one position of the group of a substrate feeding position and a roll unloading position, wherein the roll unloading position is different in location from the substrate receiving position;
• receiving the print substrate, bearing the first image, on the first roll-up unit of the at least two roll-up units, which is arranged in the substrate receiving position, thereby forming a roll;
• unwinding the roll from the first roll-up unit of the at least two roll-up units, which is arranged in the substrate feeding position, and feeding the print substrate to the printing station;
• and
• providing a second image on a second side of the print substrate in the printing station.