Drivable roll of controllable flexure, particularly for machines for the production and processing of webs of paper or plastic

In a drivable roll of controllable flexure, particularly for machines for the production and processing of webs of paper or plastic, which comprises a substantially cylindrical inner part which through journals is firmly supported on a bearing surface, and a tubular outer part which surrounds the inner part and is supported at both ends on the inner part for rotation about the cylinder axis, there being disposed on the inner part along a generatrix means for the generation of compulsive forces acting radially between the inner part and the outer part, a drive shaft which extends coaxially through one of the journals and in proximity to its outer end is supported on the journal being connected to a center gear which through a gear train mounted on the inner part drives an internal ring gear that is coaxial with the outer part and is in a driving relation therewith, the improvement wherein said drive shaft is supported at its inner end on said inner part and said center gear is integral with said drive shaft and said gear train comprises a single idler gear whose axis of rotation is parallel to the axis of said drive shaft, and whose teeth have a crest which arcuately slopes downwardly on either side in the direction of the axis of rotation, said internal ring gear being set into the outer part and secured through clamping means to the internal surface of said outer part.