Patent ID: 6480693
Filing Date: 2002-11-12
Classification: G03G,H04N

Abstract:
A method of correcting registration faults based on changes in machine state (4, 4â€²; 5, 5â€²) in a multicolor printing machine (1) having a number of printing units (13, 13â€²) with image cylinders (14, 14â€²) and exposure devices (2, 2â€²) for the digital production of color separations (3, 3â€²) on the image cylinders (14, 14â€²), the actions of setting up and combining color separations (3, 3â€²) being controlled such that in-register prints are achieved, wherein: changes in machine state (4, 4â€²; 5, 5â€²) are registered, one of the changes in machine state is temperature, and one of the changes in machine state is mechanical stress, and a mechanical stress in the multicolor printing machine (1) is registered at at least one location; and, on the basis of these changes in machine state (4, 4â€²; 5, 5â€²), the production of color separations (3, 3â€²) is changed such that a disturbance to the registration accuracy of a print, threatened by a change in machine state (4, 4â€²; 5, 5â€²), is compensated for.