Patent ID: 6519423
Filing Date: 2003-02-11
Classification: B41F,B41P

Abstract:
A method of setting registration in a multicolor printing machine (1) having a number of individual printing units (8, 8â€²) and a respective number of exposure devices (2, 2â€²) for the digital production of color separations (3, 3â€²), and a registration control system which is based on the detection of registration marks (7, 7â€²) which are printed by said individual printing units (8, 8â€²), the actions of setting up and combining the color separations (3, 3â€²) being controlled when printing substrates (16) of a different grade are fed in, in order to correct the registration setting, wherein: when a printing substrate grade is changed, the influence of all the properties of said printing substrate (16) that are relevant to registration is taken into account directly as the change is implemented, by correction values (4, 4â€²) for said printing substrate (16) that are available before printing is carried out, before a change in the printing substrate grade can have any influence on the registration marks (7, 7â€²), such that retroactive influence of properties of said printing substrate (16) of printed pages (5) which have gone before but are still in the printing process on registration of a new printed page (5â€²) that is already in the printing process is taken into account.