Patent ID: 6138563
Filing Date: 2000-10-31
Classification: B41F,Y10S

Abstract:
A method of feeding a dampening water to a plate cylinder in an offset printing press which is accelerated to, operated at and then decelerated from a normal printing speed, said method comprising the steps of:making first and second curves available to said printing press, said first and second curves being predetermined to indicate the relation of the feeding amount of dampening water to the speed of printing press, said first and second curves being different in feeding amount of said dampening water from each other within a predetermined range of speed lower than and limited by a point which is lower than said normal printing speed, said printing press printing newspapers at a speed of 40 to 70% of the normal printing speed at said point, said first and second curves being united with each other at said point into a single curve;establishing a program for controlling the feeding amount of said dampening water so that the dampening water increases in feeding amount in accordance with the increase in speed of said printing press along said first curve, when said printing press is accelerated; andautomatically switching the program from said first curve to said second curve for controlling the feeding amount of said dampening water so that the dampening water decreases in feeding amount in accordance with the decrease in speed of said printing press along said second curve, when the printing press is decelerated from a printing speed higher than said point.