In order for contaminants (50) that are in particular liquid or highly viscous or solid and impact in an operating portion (40b) of one or 2 processing shafts (40.1, 40.2) that rotate adjacent to each other not to reach bearings (2) of the shafts (40.1, 40.2) which are arranged axially outside of the processing portion (40b) which could damage the bearings a wiping device (6) is arranged there between which is additionally axially shielded by a bearing plate (3) and a splash guard plate (4) wherein the wiping device provides that contaminants (50) that reach the wiping section (40a) are wiped off at this location and cannot move further through the bearing plate (3) to the bearing (2) that is arranged outside of the bearing plate (3).