Oscillating roller and printing press having a plurality of printing units that have such a roller

A roller of a printing unit of a printing press, which printing unit includes a roller inking unit, the roller being a part of the roller inking unit, the roller comprising:

• a roller axle having an axle outer circumferential surface, the roller axle forming a roller inner body;
• a roller outer body supported on the roller inner body for axial movement, in a reciprocating manner, with respect to the roller inner body, and having a roller outer body cylindrical shell including a roller outer body cylindrical shell inner circumferential surface;
• a pneumatic drive to effect the axial movement of the roller outer body with respect to the roller inner body in at least a first axial direction;
• at least a first chamber in an interior of the roller and forming the pneumatic drive as a piston/cylinder system;
• a compressed air source to supply compressed air to the at least first chamber and to exhaust compressed air from the at least first chamber to form the pneumatic drive;
• a roller inner body annular ring on the axle outer circumferential surface and having a roller inner body annular ring outer circumferential surface;
• at least a first annular bushing on the inner circumferential surface of the roller outer body cylindrical shell and having a first annular bushing inner circumferential surface, the roller outer body cylindrical shell inner circumferential surface, the roller inner body annular ring and the at least first annular bushing forming the at least first chamber;
• a first non-contact seal between the roller outer body cylindrical shell inner circumferential surface and the roller inner body annular ring outer circumferential surface;
• and
• a second non-contact seal between the axle outer circumferential surface and the inner circumferential surface of the at least first annular bushing, each of the first non-contact seal and the second non-contact seal having a gap width of at most 0.15 mm.