Patent ID: 8180254

Claim:
In a printing system having first and second printing engines, the engines including imaging belts with seams, the first printing engine printing on a first side of a sheet, the second printing engine printing on the second side of the sheet, a method of synchronizing the printing on the second side of a sheet comprising the steps of: projecting first images on the imaging belt of the first engine, the images having a predetermined relationship with the seam of the belt of the first engine, transferring the first images to a first side of the sheets, the sheets having a given size, monitoring predefined dimensions on the belt of the second printing engine, and adjusting the position of the images projected onto the belt of the second printing engine in response to the monitored predefined dimensions, wherein the step of adjusting the position of the images projected onto the belt of the second printing engine in response to the monitored predefined dimensions includes the steps of shifting the images on the belt of the second printing engine in the direction of movement of the belt and adjusting the position of the images during each cycle of the belt while maintaining a minimum inter-document zone, in order to increase the time between skipped pitches.