The device includes a roller for guiding the web-like-material, supported idle about a rotation axis and having a first axial end and a second axial end. Two lateral supports support the guide roller. The guide roller is configured so that the rotation axis thereof may be inclined with respect to a position orthogonal to the advancement direction of the web-like material, to compensate changes in the transversal direction of the tension in the web-like material.

An assembly for producing a corrugated cardboard web laminated on one side includes a first corrugating roller and a second corrugating roller for producing a corrugated web. A glue application device applies glue to peaks of the corrugated web and a pressure belt apparatus which in turn includes a pressure belt for pressing a cover sheet against the glued peaks of the corrugated web which rests against the first corrugating roller. The assembly has a pressure belt engaging apparatus including a pressure belt engaging device which engages downwards at the pressure belt during a corrugating roller change to minimize and/or eliminate downwardly sagging of the pressure belt at least adjacent to the pressure belt engaging apparatus, and at least one displacement device in connection with the pressure belt engaging device to displace the pressure belt engaging device between a pressure belt engaging position and an idle position.