a roll - journal bearing mounting is provided by a movable bearing housing from which pistons rigidly extend in opposite directions into cylinders rigidly fixed against displacement . introduction of pressurized fluid to the cylinders moves the bearing housing either way in the direction of the pistons and cylinders . consequently , a roll journaled by bearings in the bearing housings of two of the mountings can be moved towards and from a counter roll to apply roll nip pressure . at the same time the rigidly extending pistons in their rigidly fixed cylinders also function to hold the journal loading in a right angular direction , eliminating the need for the use of separate devices for that purpose .