Patent ID: 7059247

Claim:
An ink feeding method for a printing machine, for controlling an ink feeding rate by measuring color density of prints, said method comprising: a first color density measuring step for measuring color density of prints at selected times; an expected color density computing step for computing, based on the color density of prints measured in said first color density measuring step, an expected color density of prints occurring after a predetermined number X of prints are made; an ink feeding rate correcting step for correcting the ink feeding rate based on the expected color density of prints computed in said expected color density computing step and a target color density of prints using a control coefficient Y; a second color density measuring step for measuring color density of an Xth print in said predetermined number X of prints after said ink feeding rate is corrected; and a control coefficient correcting step for correcting the control coefficient Y for use in correcting the ink feeding rate in said ink feeding rate correcting step, based on the color density measured in said second color density measuring step and said target color density of prints.