| 摘要 |
A roller device such as is used, e.g. as a distribution roller in an off-set printing machine, include an outer cylinder mounted in bearing units at opposed ends and is rotatable around and axis. At least one of the bearing units includes an inner cylinder, a casing built into the inner cylinder, which casing is rotatable via a gear by a rotation speed that differs from the rotation speed of the inner cylinder. A mechanism is provided which operates between the casing and the inner cylinder, for the purpose of converting the relative rotational movement between the casing and the inner cylinder into an axial reciprocal motion of the inner cylinder and thus also of the outer cylinder. The inner cylinder of the individual bearing unit is placed outside and is arranged to be co-rotatively carried by a pipe within which are provided two bearing sets which enable rotation of the pipe at a high speed relative to a stationary axle part, while at the same time the inner cylinder is axially movable forwards and backwards relative to the pipe without any substantial angular motion relative to the latter. |
