NUMMERTRYCKPRESSAGGREGAT

摘要

A rotary printing press assembly includes an inspection apparatus interposed between a sheet feeder for feeding printed sheets and a rotary printing press having a printing cylinder for printing additional indicia on the printed sheets. The inspection apparatus has a pair of inspection cylinders rotatable in opposite directions. A printed sheet is supplied from the sheet feeder and is held at its face and back against peripheral surfaces of the inspection. Detectors are disposed in confronting relationship to the peripheral surface of the inspection surface cylinders for inspecting the printed sheet on the inspection cylinders for any defect and for generating signals in response to detection of any defect on the printed sheet. The printing cylinder is movable away from an operational position adjacent an impression cylinder to an inoperational position away therefrom in response to a signal from the detectors indicating a defective sheet. The printed sheet bearing the detected defect passes unprinted between the printing and impression cylinders and the defective printed sheet is discharged.