Arrangement in a press roll and a press roll

#The present application claims priority under 35 U.S.C. §119 to Finnish Patent Application No. 2005-1006, filed Oct. 7, 2006, the entire contents of which are hereby incorporated by reference.

#1. Field of the Invention

#The invention relates to a press roll.

#Next, the invention will be described in detail by means of an example with reference to the accompanying drawing, in which

#FIG. 1 shows an apparatus according to the invention,

#FIG. 1a schematically shows a detail of an apparatus according to the invention,

#FIG. 1 shows a general situation of a roll according to the invention. Part 1 is a rotating surface fabric i.e. belt shell of a press roll, typically a shoe roll. Part 2 is a support shaft of the roll. The support shaft is generally a support beam in the bearing points of which there are shaft journals or similar. Parts 3 and 4 are bearings of the roll on the tending and driving side. The bearings 3 and 4 remain in position in the operating situation of the roll, and the centre shaft of the roll can expand because of e.g. thermal extension for a travel delta z towards the tending side TS of the machine. Usually, the bearing 4 on the driving side DS of the roll is a so-called fixed bearing, and the bearing of the tending side TS is free. Designation DS means the driving side of the roll. The roll deflects via a centre point P1, P2 of the bearings 3 and 4. The deflection reaches its maximum value delta y on the centre shaft of the roll from the effect of force prevailing in a press gap i.e. nip between the roll shell and a counter element (not shown in the figure). Simultaneously, the roll can deflect a little from the effect of the nip to the run direction of the web for a deflection delta x (FIG. 1a) which is perpendicular in relation to the deflection of the nip. The bearing distance of the roll is designated with measure BD. Also torsional moment Mv exerts to the support shaft 2, caused by, inter alia, forces prevailing in the press gap. A purpose of the arrangement according to the invention is, inter alia, to shift the forces of the torsional moment in question from the support shaft 2 to the support frame.

#During the operation of the roll, medium, such as oil, can be led inside the roll. The medium is led from one end of the roll and, correspondingly, removed from the other or the same end of the roll, depending on the type of the roll. In the solution according to the figure, medium is supplied from the driving side DS and led away from the tending side TS.

#FIG. 2 shows a bearing housing 5 in the bearing point of the bearing 3 and 4 and its cross-section A-A (FIG. 2a). The bearing housing is typically but not necessarily similar on both sides of the machine. Inside the bearing housing 5, there is a hole in the axial direction i.e. in the cross-direction CD of the machine on the side surface of which is formed a typically spherical machining 6. Through the side surfaces of the wall of the bearing housing 5 are formed advantageously cylindrical holes 7, 8 and for a locking element 12 counterbore machinings 9, 10. In the figure, the holes 7, 8 formed for a torque support 11 are typically substantially machine-directional MD. Furthermore, on the front surface of the bearing housing, there is an installation machining for a bearing element 14 coming inside the housing 5, not shown in the figure.