Abstract: A roller air supply structure has a stationary compressed air supply having a stationary pressure chamber that can be loaded with pressure, and a rotatable roller that has at least one opening in a surface thereof operable to be loaded with compressed air from the stationary compressed air supply. The roller is surrounded in the axial area of the opening to be loaded with compressed air in the circumferential direction at least in sections by the stationary pressure chamber. The compressed air supply has a sealing element that can be moved by loading the pressure chamber with compressed air from a position of rest into a sealing position and by relieving the pressure of the pressure chamber to ambient pressure from the sealing position into the position of rest.