Patent ID: 7559279

Claim:
A method for controlling the cut register in a web fed press through which a plurality of webs are fed, the press having a printing unit, a common knife cylinder which cuts the webs, and a plurality of clamping points between the printing unit and the knife cylinder, wherein said printing unit prints each web with a printed image and one of image information and measuring marks suitable for the deviation of the position of the printed image with respect to its intended position based on the time and position of cutting at the knife cylinder, said deviation constituting the cut register error, the method comprising: measuring said one of image information and measuring marks from at least one said web at least one of before and on the knife cylinder by at least one sensor; forming an actual value for controlling the cut register error of the at least one said web by at least one of evaluating and transforming said one of image information and measuring marks measured by the at least one sensor; and correcting the cut register error of the at least one web to a predefined set point by changing at least one of a speed of at least one clamping point and the position of the knife cylinder in accordance with the actual value, said step of correcting comprising: correcting a part cut register error by changing at least one of an angular velocity of one of said clamping points, and an angular velocity of the knife cylinder, and wherein a speed of a former roll not being affected, the former roll located between the printing unit and the knife cylinder; correcting the cut register error of a lower web by changing an angular velocity of a further clamping point; and correcting the cut register control of an upper web by changing an angular velocity of the former roll, wherein a rotational speed or angle control loop of the drive motor coupled to the former roll and the further clamping point is subordinated to a register controller for the former roll and the further clamping point, the actual values used being part cut register errors measured before the knife cylinder or a differential cut register error between the upper web and the lower web and the part cut register error, pre-control of the control loops taking place via filters.