Patent ID: 7216828

Claim:
An apparatus to adjust tension of a material web that is moved through a processing station processing the material web, comprising: a braking device acting electrostatically on the material web that is arranged in a transport path, wherein the braking device comprises: a braking plate arranged on one side of the material web, on which braking plate the material web is applied; and a charger arranged on an other side of the material web to electrostatically charge the material web; an adjustment mechanism that comprises a sensor that senses an attribute of the web in an automated manner, comprising an output signal that is used for adjusting a charge voltage for the charger in order to adjust a braking force of the braking; wherein the sensor is a web tension sensor, via whose web tension signal the charge voltage can be adjusted, which is arranged after the braking device adjacent to the material web; the apparatus further comprising: a control circuit to which the web tension signal is supplied, and that is configured to determine the charge voltage of the charger dependent on the web tension signal.