Patent ID: 8328194
Filing Date: 2012-12-11
Classification: B41F,B41J,B41P,G07D

Abstract:
1. Sheet-processing machine for processing printed sheets each comprising a plurality of printed copies, said sheet-processing machine comprising a plurality of modules through which said printed sheets are transported one after the other along a sheet conveying direction, said plurality of modules including a sheet feeder module for feeding the printed sheets and one or more downstream sheet-processing modules including at least an inspection module for monitoring the print quality of the printed sheets, wherein the inspection module comprises a first transport cylinder for transporting the printed sheets with a front side facing a first inspection device, which first inspection device inspects the front side of the printed sheets while being transported by the first transport cylinder and supported against a circumference of the first transport cylinder, and a second transport cylinder for transporting the printed sheets with a rear side facing a second inspection device, which second inspection device inspects the rear side of the printed sheets while being transported by the second transport cylinder and supported against a circumference of the second transport cylinder, wherein the inspection module comprises a third transport cylinder having a transparent casing and an additional inspection device for inspecting light-transmitting capacity of the printed sheets, wherein the additional inspection device comprises an image sensor and a light source for inspection by transmission, the light source being arranged within the transparent casing of the third transport cylinder and the image sensor being arranged outside of the transparent casing of the third transport cylinder, wherein the first and the second inspection devices are arranged outside of the casing of the first and second transport cylinders respectively, and wherein each one of the first, second and additional inspection devices is designed to check a printing quality of the printed sheets by comparing an image of a printed sheet detected by each one of the first, second and additional inspection devices with a desired printed image stored in electronic form.