The baler has a frame for receiving side walls (18) of a baling chamber (40). The frame includes parts that support the side walls, where the parts are moved farther apart. The parts supporting the side walls move relative to one another under utilization of a material elasticity of one of the frame or the parts. The are fitted via a joint, where the movement of the parts is effected by a power unit, which is actuated based on an operating state. An independent claim is also included for a method for altering the friction between the side walls of a round baler and the end faces of a round bale formed in a baling chamber.
