To provide an apparatus for producing and/or treating a material web, especially a paper web and/or a cardboard web.

This apparatus for producing and/or treating the material web, especially the paper web and/or the cardboard web, having a roll having a bearing journal disposed at the end, and a roll frame which has a bearing so that the bearing journal is mounted on the roll to be rotatable in the longitudinal axis of the roll, and further having a motor fit onto the bearing journal and supported on the bearing journal, is characterized in that the motor is clamped on the bearing journal to avoid the problems of rotation and vibration, and the length of cramp is at least one-tenth of the length of the motor shaft. The apparatus relates to a method for attaching the driving motor (6) to the roll (1) or for post-attaching the driving motor (6).