AN ARRANGEMENT IN AN ADJUSTABLE ROLLER BEARING FOR LATERAL GUIDANCE FOR RUNNING WEBS

Abstract: An arrangement in an adjustable roller bearing for lateral guidance of running webs, e.g. a paper machine wire, said roller bearing comprising a bearing casing (5) that is slidably mounted in a bearing foundation (1) by the aid of members (14,15) projecting diametrically from said bearing casing and bearing foundation and being in engagement with each other as well as being encased in hydraulic or pneu­ matic, resp., bellows means (12,13) which act as displace­ ment means for said bearing casing (5), said projecting members (14,15) being provided with cooperating guide grooves (16,17) and rollers (18,19) respectively. Said guide grooves (16,17;33) are diametrically outside the contact faces of associated rollers (18,19;19'), have faces (22,23;33) which in cross section follow a circular curve having the roller (18,19;19') center as its circle center and between each face of said kind and the adjacent roller contact face there is a lining (24,25;34) one end of which is adapted to the circular curve shape, whereas the other side, facing the roller contact face, is plane and forms a contact face for said roller.

Description: The present invention relates to an arrangement in an adjustable roller bearing for lateral guidance of running webs, e.g. a paper machine wire, said roller bearing comprising a bearing casing that is slidably mounted in a bearing foundation by the aid of members projecting diametrically from said bearing casing and bearing foundation, being in engagement with each other and being encased in hydraulic or pneumatic bellows means acting as displacement means for the bearing casing, said projecting members being provided with cooperating lateral grooves and rolls respectively. Such an adjustable roller bearing for lateral guidance of running webs is known from NO-PS 120 104. An adjustable roller bearing of this kind has a compact and sturdy design, comprises displacement bearings (roller-guide grooves) showing low friction, and provides a positive and linear guide movement. The movable parts of said roller bearing are provided inside said bellows means completely protected against external influence. The bearing casing and the bearing foundation with associated members are usually made from cast steel. When such adjustable bearings were used it was found that the rollers cause wear of the cast steel in the guide grooves cooperating with said rollers due to occurring moment loads. It is an object of the invention to provide linings, e.g. manufactured from spring steel, between said rollers and cooperating groove faces, designed in such a manner that moment loads are balanced and the wear is reduced. According to the invention an arrangement in an adjustable roller bearing of the kind mentioned above is, thus, proposed said arrangement being characterized by the fact that said guide grooves diametrically outside the contact surface of associated rollers have faces which in cross section follow circular curves with the center of roller as a center, and that between each face of said kind and the adjacent roller contact surface there is a lining, one side of which is adapted to the circular curvature, whereas its other side facing the roller contact face is plane and forms a contact face for the roller, said linings being kept in place by resilient means. This latter feature enable said linings to carry out desired minor swinging/rotary motions. In case of moment loads said linings will be able to move a little, i.e. carry out a rotary motion as seen in cross section. Thus, the moment load is balanced and wear is considerably reduced. The two linings in each guide groove may suitably be connected with each other. In an especially advantageous embodiment said two linings in each guide groove are provided as parts of an integral body. By using such an integral lining body in each guide groove the entire guide groove cross section may advantageously follow a circular curve, said integral body being provided with a corresponding outer surface. The invention will now be disclosed in more detail with reference to the drawings, where Figure 1 is a plan view of an adjustable roller bearing where the invention is used, Figure 2 is a sectional view taken along line II-II in Figure 1 and shown in a larger scale, Figure 3 is a plan view where the two parts of the bearing casing and the bearing foundation, respectively, which engage with one another are shown spread apart in the same scale as Figure 2, Figure 4 shows a variant of a section of the invention, and Figure 5 shows an enlarged part of the area designed V in Figure 3. The adjustable roller bearing shown in Figure 1 mainly comprises a bearing foundation 1 consisting of a base 2 from which supporting members 3 and 4, respectively,rise. Furthermore,the roller bearing comprises a bearing casing 5. Said bearing casing 5 is composed of a lower shell 7 and an upper shell 6 which together form a spherical casing of a top bearing provided on the roller top not shown. Lower shell 7 is at each side provided with a flange 8,9 resp. The bearing foundation is provided with corresponding flanges 10,11 respectively, on its supporting members 3,4. Between the flanges 8,10 and 9,11, respectively, facing each other a bellows means 12, 13, resp. is clamped. Each bellows means 12, 13 is connected to a pressure fluid source in a manner not shown. Reference is made to the above mentioned NO-PS 120 104 showing details of clamping bellows means between the flanges. A projection 14 extends from flange 8. Another projection 15 extends from flange 10. Said projections 14,15 engage each other, see Figures 2 and 3, and projection 14 is provided with two guide grooves 16,17, whereas the fork shaped projection 15 is provided with two rollers 18,19. Each roller 18,19 is mounted on projection 15 by the aid of a bolt 20,21, resp. As will appear especially from Figure 2, guide groove 16 has faces 22, 23 that are curved in cross section. The curvature follows circular curves having the center in the center of roller 18. Between roller 18 and the faces 22, 23 in guide groove 16 extending diametrically outside said roller a lining 24, 25, respectively, is provided. Each of said linings 24,25 is an elongated, i.e. strip shaped, member one side of which is curved in correspondence with the curvature of the contacting face 22, 23 of groove 16, whereas the other side is plane and forms a contact face for roller 18. Each lining 24, 25 of this kind is clamped by the aid of a resilient clamping connection. An example of such a connection is shown in Figure 5. In lining 24 a threaded bore 26 is provided and a threaded sleeve 27 is threaded into said bore. In projection 14 a bore 28 is provided, which forms an extension of an expanded bore 29. A screw 30 is threaded into sleeve 27 and a helical spring 31 is provided between the head of said screw 30 and the annular bottom of bore 29. Bore 28 has a larger diameter than screw 30. This clamping connection, thus, permits a certain degree of movement between projection 14 and lining 24. Bore 29 is closed by a plastic plug 32. Lining 25 is mounted accordingly. Groove 17 is provided with corresponding linings for cooperation with one roller 19. In Figure 1 projections 14,15 are only shown on one side of the bearing. Corresponding projections with associated guide grooves and rollers are obviously provided on the other side of the bearing, inside bellows means 13, as well. Instead of two separate linings, as linings 24, 25, the linings may obviously be constructed as parts of an integral body. Such a possible embodiment is shown in Figure 4. The same reference numbers are used for corresponding parts, said reference numbers being marked. Guide groove 33 is, here, formed in projection 14' with a full guide face cross section, i.e. the guide groove cross section follows a circular curve on its entire extension. Correspondingly, lining 34 is formed with a corresponding outside face 35. Lining 33 is, thus, constructed as a homogeneous body, showing an approximately U-shaped cross section with roller 19' entering the U-shape, as shown in Figure 4. Generally casting steel is used for manufacturing the bearing casing and bearing foundation, as well as for the projections on said components. In this connection it will be advantageous to use spring steel for manufacturing the linings. It will be understood that the faces having a circular arc shaped cross section in the guide grooves may be machined in a simple manner and the same goes for the curved face on the lining.

Claims: An arrangement in an adjustable roller bearing for side guidance of runnings webs, e.g. a paper machine wire, said roller bearing comprising a bearing casing (5) that is slidably mounted in a bearing foundation (1) by the aid of members (14,15) extending diametrically from said bearing casing and bearing foundation and which engage each other and are encased in bellows means (12,13) of a hydraulic or pneumatic kind respectively, which act as displacement means for the bearing casing (5), the projecting members (14,15) being provided with cooperating guide grooves (16,17) and rollers (18,19) respectively, characterized in that said guide grooves (16, 17; 33) diametrically outside the contact faces of associated rollers (18,19;19') have faces (22,23;33) which in cross section follow circular curves with the center of roller (18, 19;19') as a center, and that between each face of this kind and the adjacent roller contact surface there is a lining (24, 25; 34) one side of which is adapted to the circular curvature whereas its other side facing the roller contact face is plane and forms a contact face for said roller, said linings (24, 25) being kept in place by resilient means (26-31). An arrangement as defined in claim 1, characterized in that said two linings (24,25) in each guide groove (16) are connected with each other. An arrangement as defined in claim 2, characterized in that said two linings in each guide groove (33) form parts of an integral body (34). An arrangement as defined in claim 3, characterized in that the entire guide groove cross section follows a circular arc (33) and in that said integral body (34) has a corresponding outer surface (35).

Inventors: BARTHEL, SVEN
Applicants: THUNE-EUREKA A/S
Application year: 1986
Main classification: D21F1
IPC codes: D21F1