Patent ID: 7533608

Claim:
A printing group of a printing press not having a dampening unit, said printing group comprising: a plate cylinder; at least first and second waterless planographic printing plates, each having a print image area and being arranged one behind the other in a circumferential direction of said plate cylinder and having first and second sets of adjacent printing plate ends extending longitudinally on said plate cylinder, said adjacent plate ends being located outside of said print image areas of said at least first and second waterless planographic printing plates; a transfer cylinder cooperating with said at least first and second waterless planographic printing plates on said plate cylinder; a printing blanket on a circumferential surface of said transfer cylinder and adapted to receive an ink image from said print image area of each said waterless planographic printing plate on said plate cylinder; a printing blanket end receiving opening on said circumferential surface of said transfer cylinder, said opening being located opposite said a first set of said adjacent printing plate ends of said first and second circumferentially arranged printing plates; a coating on said printing blanket and having a coating thickness, said coating being adapted to receive a print image from said print image area of each said waterless planographic printing plate; a depression formed as a groove in said coating on said printing blanket, said groove being located opposite said a second set of said adjacent printing plate ends of said first and second circumferentially arranged printing plates and having a depth of between 5% and 15% of said coating thickness; and a metal support plate supporting said printing blanket, said printing blanket end receiving opening and said printing blanket coating groove preventing said first and second sets of printing plate ends from forming a plate end print image on said coating.