Patent ID: 6629497
Filing Date: 2003-10-07
Classification: B41F

Abstract:
An ink pump control apparatus for use in a printing press by changing the feed rate of ink by ink pumps based on printing image ratio and printing speed, the ink pump control apparatus comprising:an image ratio input section to input data corresponding to a printing image ratio for an area of a printing material to which ink is fed; a printing speed detecting section to detect the printing speed of the printing press and to output a printing speed signal corresponding to the printing speed; a speed judgement section to judge changes in printing speed based on the printing speed signal output by the printing speed detecting section; a memory section to store first correction coefficients determined by printing image ratios, and third correction coefficients determined by acceleration and deceleration of printing speed; and a processing section to fetch from the memory section the first and third correction coefficients based on data corresponding to the input printing image ratios and the speed change judgement result output by the speed judgement section, to calculate an ink feed correction coefficient from these coefficients and the printing speed, and to output a signal to operate the ink pump so that the amount of ink corrected by the ink feed correction coefficient can be fed, wherein the ink pump control apparatus controls the operation of the ink pumps based on the data corresponding to the printing image ratio, the speed change result, and the printing speed.