Patent ID: 6522857
Filing Date: 2003-02-18
Classification: G03G

Abstract:
A method of setting registration in a multicolor printing machine (1) having a number of exposure devices (2, 2â€², . . . ) associated with individual printing units (9, 9â€², . . . ) for the digital production of color separations (3, 3â€², . . . ), the actions of setting up and combining color separations (3, 3â€², . . . ) being controlled based on the detection of registration marks (8, 8â€², . . . ) which are printed by said individual printing units (9, 9â€², . . . ), in order to set registration, such that in-register prints are obtained, influencing variables (4, 4â€², 4â€³) which are caused by printed pages and have an influence on registration being taken into account in setting up and combining the color separations (3, 3â€², . . . ) before the onset of a change in said influencing variables, wherein: in the event of a registration correction resulting from a change in influencing variables (4, 4â€², 4â€³) including influencing variables (4â€³) of properties of a printing substrate (5) used by a printed page, the retroactive influence of said influencing variables (4, 4â€², 4â€³) of the preceding printed page (33) is taken into account, and correction is made before the change caused by a printed page can have any influence on said registration marks (8, 8â€², . . . ).