Patent ID: 8065957

Claim:
A sheet inspection system for a sheet-fed recto-verso printing press of the type including two printing cylinders for carrying out simultaneous recto-verso printing of the sheets, the sheet inspection system comprising an inspection device for taking an image of one side of the printed sheets, wherein the sheet inspection system includes first and second transfer cylinders interposed between a first of the two printing cylinders and a chain gripper system of the printing press, printed sheets being transferred successively from the first printing cylinder to the first transfer cylinder, to the second transfer cylinder, and to the chain gripper system, the first transfer cylinder cooperating with the first printing cylinder to take away the printed sheets from the surface of the first printing cylinder and transfer the printed sheets to the second transfer cylinder, which printed sheets are then transferred from the second transfer cylinder to the chain gripper system, and wherein the inspection device include a line image sensor for performing line-scanning image acquisition of the one side of the printed sheets, the line image sensor visually acquiring an image of a printed sheet while the printed sheet is being transported on the first or second transfer cylinder.