Patent ID: 6477954
Filing Date: 2002-11-12
Classification: B41F

Abstract:
A method of presetting an inker in an offset printing press, which comprises:inputting an image coverage distribution for an image to be printed; setting printed ink film commands for a printed ink film in each lateral zone in accordance with the image coverage distribution; simulating an inking operation for calculating a simulated ink coverage distribution, and thereby driving a steady state error between the printed ink film commands and the ink coverage to zero and obtaining ink key presets, by discretizing all inker paths in the inker with equal sized segments by dividing with lateral segments and circumferential segments, advancing the printing unit by one circumferential segment, calculating an amount of ink on each element after traversing a nip between two rollers, calculating a lateral overlap of elements based on a lateral motion of a vibrator roll in a given inker path, and repeating the advancing step and the calculating steps for a plurality of revolutions of a plate cylinder in the inker path; and presetting the ink keys of the inker with the ink key presets at a start of an actual print job.