Patent ID: 7938064

Claim:
A printing unit of a web-fed rotary press, the printing unit comprising a plurality of press units and at least one impression cylinder, each said press unit comprising: a forme cylinder bearing a plurality of printing images next to each other in an axial direction, each said printing image corresponding to a single color printed image applied to a printing material; and a transfer cylinder rolling on the at least one impression cylinder in a thrown-on position of the printing unit in order to transfer ink from the printing images on a respective said forme cylinder to a printing material, thereby forming printed images; wherein the forme cylinder and the transfer cylinder are subjected to a deflection during printing causing a deviation in a circumferential register between the printed images; and wherein said printing images on at least one of said forme cylinders are offset circumferentially with respect to each other based at least in part on the deflection of the forme cylinder and the transfer cylinder during printing so that the deviations in the circumferential register between the single-color printed images applied by the respective press units are compensated for whereby the printed images are longitudinally aligned along the axial direction.