Abstract: A web offset print unit includes a first plate cylinder, a first blanket cylinder selectively in contact with the first plate cylinder, a second blanket cylinder, the web passing between the first and second blanket cylinders, the second blanket cylinder and first blanket cylinder being selectively disengageable from the web in a throw-off position to permit the web to pass between the first and second blanket cylinders, and a second plate cylinder selectively engageable with the second blanket cylinder. A single drive motor drives the first plate cylinder, first blanket cylinder, second blanket cylinder and second plate cylinder when the first and second blanket cylinders engage the web and the single drive motor rotates the first and second plate cylinders when the first and second blanket cylinders are in the throw-off position. Autoplating during the throw-off position thus is possible.

Abstract: A folder for processing a stream of printed signatures from a printing press and related method. The signatures have a desired path with a path edge and each signature has a lead and trail edge. The folder comprises a plurality of sensor sets, each sensor set for determining if the lead and/or trail edge of the signature deviates from the path edge by more than a certain tolerance.