a device for regulating the tension of a moving web of material , in particular a web of paper in a paper - working machine such as a corrugating machine , comprises a machine frame ; a first roller that is mounted for rotation about a first axis of rotation in relation to the machine frame , taking up a web of material by an angle of contact a ; and a supporting device , which supports itself on the machine frame , and which is mounted for pivoting about the first axis of rotation by a pivoting drive , and which supports at least a second roller mounted for rotation about a second axis of rotation that is substantially parallel to the first axis of rotation ; wherein the angle of contact a of the web of material on the first roller is modifiable by the at least one second roller being pivoted about the first roller .