Patent ID: 8721022

Claim:
A digital printing method in which images for a page are each consecutively printed by a digital printer on a web of paper for a rotary press fed in a forward feed direction of travel and in which after printing is temporarily halted while the web of paper is en route, printing is reinitiated on the web of paper and fed again in the forward feed direction of travel, the method comprising: printing a timing mark for each of said images; in re-printing after printing is temporarily halted while the web of paper is en route, feeding the web of paper backwards such that a plurality of images printed thereon before printing is temporarily halted is moved in an upstream direction of the digital printer and thereafter re-feeding the web of paper in the forward feed direction, and counting, upstream of the digital printer, a number of timing marks for each image in each of the forward feed and backward feed directions of the web of paper; and when the number of the timing marks counted in the forward feed direction coincides with the number of the timing marks counted in the backward feed direction, reinitiating consecutive printing of the images from a position immediately following an image last printed before the printing is temporarily halted.