Patent ID: 6626104
Filing Date: 2003-09-30
Classification: B41F

Abstract:
An offset printing machine comprising at least one printing unit for printing a print carrier web on both sides with at least one color, said at least one unit comprising:a plate cylinder arranged on each side of the web, each said plate cylinder carrying a finite printing plate; a rubber blanket cylinder arranged on each side of the web, each said rubber blanket cylinder carrying a rubber sleeve which cannot undergo any movement relative to the rubber blanket cylinder, each said rubber blanket cylinder being arranged for transfer of ink from a corresponding said printing plate; a lateral register arranged to move each said plate cylinder axially with respect to the corresponding blanket cylinder; a circumferential register arranged to move each said plate cylinder circumferentially with respect to the corresponding blanket cylinder; one of the lateral registers and the circumferential registers being adjustable on command by predetermined values at one of predetermined time intervals and continuously, the corresponding plate cylinders being displaceable in at least one of the axial and circumferential direction by an amount corresponding to the corresponding predetermined values; wherein, at predetermined time intervals, one said plate cylinder can be at least one of rotated forwards and backwards and displaced back and forth axially by predetermined amounts on command, and wherein the remaining plate cylinders involved in printing follow the movement of the one plate cylinder automatically by means of circumferential and lateral register control.