Patent ID: 8485095

Claim:
A device for measuring and setting a web tension on a printing press having a plurality of inking units (D n ), comprising: a measuring element (M m,n ) for measuring the web tension and a setting element (F n ) for setting the web tension, using which the web tension can be set actively in a case of unsteady web tension conditions, the measuring element (M m,n ) and the setting element (F n ) being disposed in such a manner that the web tension can be measured and set between print areas of two of the inking units; and a control device, which controls the setting element based on the measured values of the measuring element (M m,n ), with cylinders carrying a print image being pre-positioned before the web tension setting, the pre-positioning being effected while a related cylinder carrying the print image is lifted off from the web, and with the cylinders carrying the print image being pre-positioned before the web tension setting based on an angular amount required for setting the web tension, a pre-positioning angle (α) and a setting angle (−α) having unlike algebraic signs and equal values, the control device having at least one of hardware and software components that include a first control element for setting the web tension in a pre-registering method for determining a register target position, a second control element for the pre-positioning of the cylinders carrying the print image, the second control element pre-positioning at least one of the cylinders before the setting process based on the pre-positioning angle (α) in relation to the register target position, the pre-positioning being effected while the related cylinder carrying the print image is lifted off from the web, and a third control element, which adjusts at least one cylinder carrying a print image around the setting angle (−α), so that the previously determined register target position for longitudinal registration is set.