Patent ID: 8973915
Filing Date: 2015-03-10
Classification: B41F,B65H

Abstract:
1. A quality control system for the qualitative assessment of sheets comprising: a transport device including a gripper system with grippers moving along a curved path for holding a sheet to be inspected at a leading edge thereof and transporting the sheet in a transport direction; a curved sheet guide plate placed next to the passage of the sheet being transported by the transport device, said curved sheet guide plate having a concavely-curved sheet guide surface onto which the sheet is guided; a suction apparatus placed on a rear side of the sheet guide plate by means of which a negative pressure is produced on the sheet guide surface of the sheet guide plate to draw the sheet against the sheet guide surface; and an inspection system facing the sheet guide surface of the sheet guide plate for performing qualitative inspection of the sheet while it is drawn against the sheet guide surface, wherein the sheet guide surface of the sheet guide plate describes a circular arc segment with radius Ra and wherein said inspection system is arranged at a center of the circular arc segment such that the inspection system is at a constant distance with respect to the sheet being drawn against the sheet guide surface, wherein the sheet guide plate is arranged in such a way that the sheet guide surface, as viewed in the transport direction, continuously and progressively approaches the curved path of the leading edge of the sheet being held in the grippers, and wherein the sheet guide plate is provided at a downstream end thereof with depressions running parallel to the transport direction for partially accommodating the grippers, which depressions are formed by cutouts in the sheet guide surface of the sheet guide plate.