Patent ID: 9156245
Filing Date: 2015-10-13
Classification: B41F,B65H

Abstract:
1. An inspection system for inspecting the quality of printed sheets which are transported by a sheet conveyor system comprising at least one sheet gripper system including a plurality of spaced-apart gripper bars for holding the printed sheets by a leading edge thereof, said inspection system comprising an optical quality control apparatus for carrying out inspection of a first side of the printed sheets while the printed sheets are being transported by the sheet gripper system, wherein said optical quality control apparatus includes a line camera for scanning the first side of the printed sheets at an inspection location which is situated at a location proximate to a portion of the sheet gripper system where the gripper bars transporting the printed sheets undergo a change of direction of displacement while the printed sheets are still being scanned by the line camera, said inspection system further comprising a suction roller that is placed in front of the optical path of the line camera along the path of the printed sheets being transported by the sheet gripper system, which suction roller contacts a second side of the printed sheets opposite to the first side which is being scanned by the line camera, said suction roller being driven at a selected circumferential speed to drive successive portions of the printed sheets being inspected by the optical quality control apparatus at a determined and controlled speed past the line camera, wherein said suction roller comprises a plurality of aspiration openings and an adjustment mechanism configured to selectively close part of the plurality of aspiration openings in dependence of the width of the printed sheets to be inspected, wherein said adjustment mechanism comprises a rotatable adjustment member provided with a plurality of rows of apertures of varying numbers extending transversally to the direction of displacement of the sheets.