The invention provides a method pertains to the operation of the printer equipped with a plurality of printing devices, especially a sheet printer. Each printing device comprises one impression cylinder (3), one transfer cylinder (2), one plate cylinder (1), one inking device (4), and one damping device (5) according to occasion. Further, at least one of the printing devices has an incorporated additional operating device (10) constituted especially as a varnishing device. In addition, each printing device is used for printing a printable material, with the inking device (4) selected, in a first operating mode, and the inking device (4) is used for an additional operation, especially varnishing to the printable material in a second operating mode. Besides, in the second operating mode, the inking device (4), and the damping device (5) according to occasion is disconnected and stopped on the drive side. |