Patent ID: 9061487
Filing Date: 2015-06-23
Classification: B41F,B41P

Abstract:
1. A method for changing printing plates in rotary printing presses having a plurality of printing units, the method comprising the following steps: providing each printing unit with a blanket cylinder, a plate cylinder associated with the blanket cylinder, and a dedicated drive for driving the plate cylinder independently of the associated blanket cylinder; during a plate changing operation, at least in one operating mode for eliminating a disruption, rotating at least a blanket cylinder of a printing unit in which a disruption is or was present at a higher circumferential speed than an associated plate cylinder, while conveying one or more printing plates out of the printing unit; decoupling the plate cylinder of the disrupted printing unit during the elimination of the disruption and rotating the plate cylinder into a reference position, while simultaneously conveying out the plates in the printing units not being disrupted; and subsequently, with the plate cylinder in the disrupted printing unit still being decoupled, rotating the plate cylinders of the other printing units into a position being synchronized with the reference position of the plate cylinder in the disrupted printing unit.