FI108555B - Roll which directs the course of a movable web - Google Patents

Description

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The invention relates to a rotating roll according to the preamble of claim 1.

A rotary take-out roller used in connection with a paper machine calender for controlling the passage of a paper web is known in the prior art. The roll consists of three lie-10 cylindrical cylinders which are parallel to the paper web and each cylinder is independently supported on a support shaft passing through them all. However, the outermost cylinders are so mounted on the support shaft that their outer bearings are slightly displaced from the center line of the support shaft. With this move, the three-piece roll becomes such that the middle roll | 15 rotate completely around the centerline of the support axle, but the outermost rollers can be adjusted to a slightly pivoted position so that the entire axis of rotation of the roll is a broken line, albeit with a very small change of direction. Spherical ball bearings have been used as bearings for the rightmost rollers, which makes it possible to adjust by moving one of the other bearings.

20 · · Such a roll-shaped roller with steel cylinders, which is set in a curved line, • · 2 contains gaps between adjacent cylinders when the rightmost rollers are adjusted.

»· • ·, Even though gaskets use gaskets in the gaps, they do not penetrate the bearing grease grease. The metal roller tube also warms up at the bearings and leaves a trace on the paper. In addition, the structure has a poor paper-tightening and spreading effect due to clear discontinuities. The roll is just aiming at the • 1 ''; to draw the web sideways before it goes to the calender, tracking the center of the roll for the most tension on the web and less for the edges of the roll. Muo-> · ·, · · ·. by taking the roll from three or more adjacent cylinders, the •> 30 crossover adjustment is achieved only as a broken profile over which the paper web passes.

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The roll of the invention achieves a significant improvement both in the roll profile and in the fact that the gaps in the multi-part roll are eliminated between the pieces. The invention is characterized by what is stated in the claims.

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It is an object of the invention to eliminate discontinuities in the roll shell portion and to achieve this by using a reinforcing plastic or similar composite structure as the shell material, which is made into a continuous shell which is supported at each end by a pair of bearings spaced apart. The proposed mated -10 beam allows rotation around a slightly curved axis of rotation. The roll casing is then subjected to fatigue loading due to continuous bending. When the necessary deviation, for example 0.3% of the length of the jacket tube, is adjusted to the diaper, this causes an elongation so small that it does not exceed the permissible elongation value for some materials in question.

15

The adjustment by means of the roll of the invention is ideal for a paper web. The constant diameter diaper provides a curved and continuous profile thereon on the line where the web contacts the roll. In addition, the track as a whole becomes lightweight! ... and inexpensive manufactures.

20 .. In the following, the invention will be explained in more detail with reference to the accompanying drawing, · *. ·, Where • ·. , ·. Figure 1 is a side elevational view of the roll.

Figure 1 shows a composite roll with a jacket tube 1. The jacket .... j is cylindrical and has a constant outer diameter. Within the jacket 1 is a shaft 2, known per se, which is non-rotatable and supported in place. Shaft 2 is not moved _.I. t during the adjustment to change the outer casing profile. The central part of the shaft 2 has> * ·. · · ·, Thickening for improved stability. Sheath 1 is a continuous tube.

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The bearing solution is a sleeve 5 which is hinged to the shaft 2 within the sheath 1 by means of a pivot 8 comprising a pivot pin, in the left-hand embodiment of Figure 1. The pin of the joint 8 passes through the shaft 2 and both ends extend to the sleeve 5. At the end of the sleeve is a reinforcing ring 13 which has housings on each of the studs 5 of the pin. The adjusting screw 7 allows the sleeve 5 to be pivoted relative to the shaft 2, whereby the bearings 4 form a pair of forces for bending the jacket tube 1. The center of rotation of the bearings 4 is located on a curved curve 12 which at the same time depicts the center line of the bent roll.

The support of the sleeve 5 to the shaft 2 can be improved by similar additional screws mounted in addition to the adjusting screw 7. Multiple-direction screws can be used to rotate the sleeve 5 against the support shaft 2.

The right-hand embodiment of Fig. 1 shows the support of the sleeve 5 to the shaft 2 by means of a pivot joint 3. The rotation of the sleeve 5 is preferably prevented in this case] | e.g. by means of adjusting screws 7 passing through the shaft 2.

| i! According to Fig. 1, a plurality of meters of sheath 1 supported by four bearings is curved outwardly by turning the sleeves 5 to a flat curve without discontinuous shots. In practice, the curvature occurring is so small that the composite roll • • .. withstands the fully occurring fatigue bending stress. The rotating weather roller • has to bend twice across the straight line at each turn. in the direction of the pan, once in traction and once in compression. The roller is subjected to a fatigue load which, however, does not exceed the permissible deformation value of 0.1%, which is the stated limit for certain composite materials.

The sleeve 5 is supported by outer bearings 4b and inner bearings 4a. The bearings »4a are preferably located near pivot point 8 or ball joint 3.

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The sleeve 5 may extend toward the center of the diaper some distance from the joint 8 or the ball joint 30 if the location of the inner bearing 4a is desired to be centered on the diaper.

The joints 8 or 3 may be disposed freely relative to the sleeve 5. Preferably I I • I I I · 4! However, the joints are on the part of the shaft 2 which is inside the shell 1. The bearings 4a and 4b may also be disposed spaced apart on the outer circumference of the sleeve 5.

j 5 The casing material is, for example, of a carbon fiber composite structure, which gives the rotating structure sufficient elongation and high specific frequency. The paper web passing over the roll rotates the diaper, and the roll is loaded with a tension force of the paper web that is relatively low at only a few tens of kiloponds per meter length of the diaper.

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Claims (6)

A roller which controls the course of a moving web, in particular a roller which controls the course of the paper web in a paper machine, wherein at least a portion of a casing tube 5 (1) of the roller rotates eccentrically relative to the center line of a support shaft (2) and the manifold is uniform and the material thereof is reinforced plastic or a similar composite structure, and the roller is supported on adjustable cylindrical pieces (5) supported by the support shaft (2), characterized in that the storage of each end of the the casing (1) comprises said cylindrical piece 10, such as a sleeve, which is non-rotating and on which two bearings (4a), (4b) are spaced apart from each other for rotation of the casing (1) and for bending the casing In bending form by mediating these and between said cylindrical piece and supporting shaft, a hinge (8), (3) is provided for controlling the directional difference between the supporting shaft and the cylindrical piece. 15 Roll according to claim 1, characterized in that the innermost layer (4a) is located at the joint (8). Roll according to claim 1, characterized in that the sleeve (5) proceeds from the joint (8), (3) towards the central portion of the roll and the bearing (4a) is located at the end of the collar. i a • · a I I