Patent ID: 6802251
Filing Date: 2004-10-12
Classification: B41F,B41P

Abstract:
A dampening water feeding method for a printing machine that controls an ink feeding rate and a dampening water feeding rate by measuring, with color density measuring means, color density of prints produced, said method comprising:a color density measuring step for measuring color densities of unprinted areas on prints with said color density measuring means; a determining step for determining from the color densities obtained in said color density measuring step whether ink tinting has occurred; and a dampening water adjusting step for adjusting the dampening water feeding rate when said determining step determines that ink tinting has occurred, wherein said dampening water adjusting step includes a step of forcibly feeding the dampening water with a temporarily increased rate, and thereafter a step of feeding the dampening water with a rate lower than the temporarily increased rate and higher than a rate prior to the step of forcibly feeding the dampening water.