Patent ID: 7185587

Claim:
In a rotary press comprising a plurality of clamping points through which a web is fed, said clamping points including an unwind for introducing a mass flow of the web into the rotary press and a knife cylinder for cutting the web, each of the plural clamping points being independently driven by drive motors with at least one of current, rotational speed, and angle control, an apparatus for controlling a cutting register error of the web, comprising: a first sensor arranged one of upstream and at the knife cylinder for registering a cutting register on the web and outputting a first signal in response to the cutting register, wherein said cutting register comprises a specific item of image information or a measuring mark on the web; a second sensor arranged for registering a web tension and generating a second signal; a control device connected to said first and second sensor for receiving the first and second signals and arranged for determining a cutting register error in response to the first signal received from said first sensor and a web tension in response to the second signal received from the second sensor, the cutting register error representing a deviation of the cutting register from its intended position at the time that the cutting register is registered by said first sensor with respect to the position at a previous clamping point; and a man-machine interface connected to said controller for allowing setpoints for a web tension to be set separately from a set point of a partial cutting register error such that the control of the web tension is decoupled from control of the partial cutting register error.