FI92682B - Spreader roll - Google Patents

Description

92682

A spreader roll

The present invention relates to an application roller for guiding materials or raw materials in the form of a web of material.

According to DE-GM 85 06 704, such an application roller is provided with a support shaft on which a deformable application roller coating with a substantially cylindrical circumferential surface is placed. Annular cuts extend outwardly from the circumferential surface of the spreading roll coating at an angle other than 90 ° to the longitudinal central axis1 of the support shaft.

This roller is suitable for a wide variety of applications, of which the following are a few examples:

Paper industry, textile industry, plastics industry, leather industry and mechanical engineering in general.

The deformable spreading roller coating is then made mainly of natural rubber or other types of rubber.

This known roll has proven to be quite reliable in practice and has hitherto been used mainly for so-called

"Banaanitelana". This is a roll formed outwardly curved like a banana, these rolls being divided into individual deformable parts, whereby such a roll, when passed through a web of material, can be provided with a substantially cross-sectional shape of a cylindrical part.

Since these banana rolls require little maintenance, the roll known from DE-GM 85 06 704 does not need to be constantly adjusted. This saves time and costs during their manufacture.

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However, it has been found that even these rolls can be further improved, in particular - depending on the application - in terms of the spreading effect of the roll in its peripheral region. In this case, the aim is to optimize the design of the roll so that the web of material passing through the roll comes as evenly as possible against the surface of the roll, which can only be achieved in part with currently known rolls by means of annular cuts with a predominant cross-section.

The present invention is based on the finding that deformation of the cut surfaces of known rolls can lead to partial flattening of the lamellar portions between these cuts, whereby on the one hand, in particular when handling sensitive goods such as silk, the roll surface irregularities due to this flattening against the material to be treated, and on the other hand also the outer edge area of the material cannot always be spread optimally outwards.

The present invention now provides a spreading roller for guiding materials in the form of a web of material, this roll being provided with a support shaft fixed to a deformable spreading roller cover with a substantially cylindrical circumferential surface, the annular cuts extending outwardly from said circumferential surface like a mirror image, up to the axial center of the applicator roll coating from either end of the roll, wherein at least one cut of the spread roll roll: in one half has a different depth compared to the other cuts.

The angle below which the cuts are to pass is in a preferred embodiment of the invention 30-60 °, and preferably 40-50 °.

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Dividing the roll into a mirror image of the right and left halves is important because it is the only way to ensure that the web of material passed through the roll is spread evenly on the left or right side, respectively.

The cutting depth of the individual cuts can be adjusted depending on the particular application, and according to a preferred embodiment, the cuts in the vicinity of each end of the spreading roll cover are made deeper than the cuts towards the center of the spreading roll cover. In this way, the advantage is obtained that the outer cuts can better deform in both the radial and axial directions at both free ends, whereby the spreading effect of the roll on the material in this area becomes more efficient.

In addition, this effect can be improved when the cuts are provided with a smaller opening width at their open ends on the circumferential surfaces than at their ends towards the support shaft. In this case, the sections can have, for example, an almost trapezoidal cross-sectional shape.

In this way, the advantage is obtained that the respective ring lamellae extend in this region perpendicularly with respect to the support shaft .. due to the force exerted by the tension force of the web on the spreading roll relatively further towards the corresponding end of the support shaft.

In the case of the characteristic • ·:: feature formed by a greater depth of cut, the corresponding annular lamellae extend seemingly longer or are slightly less stable in their base area where they coincide with the uncut part of the pavement than when the cuts have a parallelepiped-shaped cross-section, as such a cross-section makes parts correspondingly thicker- ·: why. According to the field of application, this embodiment 92682 also falls within the scope of the invention.

Different cutting depths are determined in a manner depending on the purpose of the roll. According to the invention, it is thus proposed to step the cutting depths mainly towards each free end of the roll, whereby the spreading roll can possibly be divided into several cylindrical parts, each cylindrical part containing several cuts of the same depth. However, it is particularly advantageous when the cutting depth between the individual annular lamellae increases from the central part of the roll as it goes to both ends. The roll is then generally useful, above all, in applications in which several strips of parallel material must be passed over the roll at the same time.

For this purpose, a further preferred embodiment is proposed according to the invention, in which the roll is formed to comprise a plurality of parts corresponding to the number of strips of material passing therethrough, each such part being made as a roll according to the invention, thus including a mirror-like arrangement. Such a roll then comprises a plurality of rollers according to the invention connected in succession in the axial direction.

In this way, a wide one-piece strip-web can first be drawn in the direction of the roll and divided into individual strips only shortly before the roll, for example by means of a suitable cutting device. Each strip will then, as described above, be moved only to pass: through the corresponding roll part and also spread to the right and left.

Such a "multi-roll" is suitable for use, for example, for transferring a paper web, which is divided into individual paper web strips shortly before the roll, which are then wound on a cardboard core, for example for the production of toilet paper rolls 92682.

In addition, it has been found that the design of the roll in terms of its holding capacity as a whole can also be optimized so that the bottoms of the cuts closest to the support shaft and furthest from the support shaft form the imaginary central surface of the spreading roll coating, i. the "average cutting depth" extends approximately to the average thickness of the applicator roll coating.

The characteristic properties described above result in an application roller whose operating characteristics even exceed those of the roller according to DE-GM 85 06 704; which has a better application effect and can be used more easily for different application areas. In addition, the roll according to the invention can be used to optimize the desired widest possible control of the web of material passed therethrough, in which case in more detail below with reference to the accompanying drawings.

This effect can also be controlled by the choice of coating material so that the annular cuts are formed relative to each other in such a way that the cut extends scaly towards the roll center so that its front end towards the roll center extends over the corresponding end of the roll to the outer end of the roll center. will also be described in more detail below with reference to the accompanying drawings.

Other characteristic features of the invention will become apparent from the subclaims and from the other description.

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The invention will now be described with reference to the accompanying drawings, in which:

Figure 1 shows a partially sectioned side view of a spreading roll according to the invention, and

Figure 2 shows a partial view of a roll provided with a plurality of parallel webs.

The spreading roll according to the invention is indicated in its entirety by reference numeral 10. This roll comprises a support shaft 11 and a rubber spreading roll coating of thickness D fixed to it. However, any of the above materials may also be selected as the coating material.

The support shaft 11 is made cylindrical and extends at its ends 13 over both sides of the cover 12, the ends 13 acting as normal vertical bearings for bearing the roll on, for example, radial rolling bearings.

The circumferential surface 14 of the spreading roller 10 is made substantially cylindrical, but with axially spaced sections 15. In this case, the thickness D of the roller is divided into a sectioned area 16 and a non-sectioned area 17 between it and the support shaft 11. Half height of the coating 12, corresponding to its mean plane is indicated by a dashed line 26 in Figure 1.

Reference numeral 18 denotes the (imaginary) radial center plane of the roll 10.

The central plane 18 forms a "mirror surface", i.e. the roll 10 comprises, in addition to the right-hand part shown in Fig. 1, its mirror-left part. The roll will be described below with its right-hand part, so that its ··· properties can be transferred to the left-hand half in the same way as the mirror image 92682.

However, it is still necessary to describe the area immediately to the right and left of the central plane 18, which in the embodiment shown in Fig. 1 is shaped in a special way. Namely, in this area, the roll 10 comprises a cylindrical part 20 ', next to which a radially extending groove 21 is formed.

Between this radial groove (radial section) 21 and the right-hand end 12 'passes four axially spaced annular sections 15', 15a, 15b, 15c.

In this case, the annular section 15 'has a parallelepiped-shaped cross-section, while the other sections 15a, 15b and 15c have a substantially half-parallelepiped-shaped cross-section, the sections having a smaller aperture width at their open ends at the circumferential surface at his head (marked with the number b).

Thus, the lamellar portion 20a passing between the sections 15 'and 15a has a greater width in the axial direction at its circumferential end than at its end facing the support shaft 11.

Furthermore, it can be seen from Figure 1 that the annular section 15a has a smaller depth than the section 15b, which again has a depth smaller than the section 15c, so that overall the depths of the sections 15a, 15b, 15c increase from the center plane 18 to the right end 12 '.

A different cross-sectional shape of the section 21 or section 15 ', respectively, compared to sections 15a, 15b, 15c is shown in the figure merely to illustrate the cross-sections proposed in accordance with the invention. Thus, of course, sections 21 and 15a, 15b and 15c could also be made at the same angle. with respect to the support shaft 11, but with a parallelepiped-shaped cross-section.It is also possible to give the section 15 'or 21, respectively, a cross-sectional shape corresponding to the sections 15a, 15b, 15c.

However, according to the invention, it is important that one or more cuts have a different depth than the other cuts, so that in the embodiment 1 shown in Fig. 1, the cutting depths preferably increase as they go to the edge end (12 ') of the spreading roller.

It can further be seen from Figure 1 that the circumferential annular sections 15a, 15b, 15c and - in a corresponding embodiment, of course also the sections 15 'and 21 - are formed so that these sections are longitudinal with respect to each other, which will be described in more detail below with reference to sections 15b. and 15a. It can be seen from the figure that the lower end of the section 15b facing the central plane 18, denoted by reference numeral 15b ', extends further in the direction of the central plane 18 than the upper end to the right of section 15a, denoted by reference numeral 15a'.

In addition, it should be noted once again that the circumferential surfaces of the lamellar parts are made cylindrical, which is easily visible in connection with the lamella 20 and above all together with the characteristic properties of the trapezoidal sections 15a, 15b, 15c leading to the corresponding lamellae after deformation, at the moment when the web of material is guided to pass through the roll, extend so far towards that end of the roll that they are moved opposite each other, resulting in an almost closed cylindrical surface, the diameter of the cylinder thus formed necessarily being slightly smaller than 2D + support shaft 11 .

92682 This coating arrangement is further enhanced by the fact that the individual lamellae deform more easily in their bases due to their smaller cross-section than in previously known embodiments.

As further shown in Figure 1, the (imaginary) cylindrical surface 26 is located exactly between the bottom of the groove of the cut 15a and the bottom of the groove of the cut 15c, which is advantageous according to the invention because the roll flexibility (deformability) is fully preserved and the roll stabilized.

In this case, the distance between the bottom of the groove of section 15a and the bottom of the groove of section 15c is marked by the distance measure delta x.

The compressive pressure caused by the web of material passed through the roll is caused by the tension of the web and occurs at the points where the web is entwined with the spreader roll 10. The wrinkling angle is folds and wrinkles can be applied evenly. Thanks to the high coefficient of friction of the elastomer of the roll top tea, • · · safe and even control of the material web is guaranteed.

The roll coating formed according to the invention can also be placed on the support shafts of currently known rolls.

* · * The sections 15a, 15b, 15c shown in the figure are at an angle of 38 to 45 ° to the support axis 11, the surfaces (e.g. 15c ”) facing said end portion '(12') running at an angle of 45 ° to the longitudinal center axis of the support axis 11, towards the center plane 18 while the surfaces (e.g. 15c ') pass at an angle of only 38 °, the lamellae (e.g. 25) between them 92682 obtaining the trapezoidal cross-section described above or a correspondingly tapered base.

In particular, the cut adjacent to the part 20 '(in this case 21) must, of course, be shaped so as not to cut the part 20', which according to the invention can be realized particularly advantageously by providing this cut at a greater depth at each end.

Finally, it can be seen from Figure 1 that the outer part 24 is without further cutting. Of course, a cut-out from the end face can also be formed, but in general the embodiment shown is sufficient, firstly because it is furthermore provided with only a small edge portion for good deformation and secondly because the web passing through the roll is generally slightly wider than the overall roll width.

Fig. 2 shows a partial view of the application roller 10 'only in a schematic manner, however, the structure of this roller is in accordance with the embodiment shown in Fig. 1. This application roller 10 ', is run over the material web 28 in the direction 27 of the arrow, the web, however, are cut before the roll entering only through the disc-shaped schematically shown the cutting blades 29 of the four single web 30, 31, 32, 33. The cutting blades 29 of the rotary shaft 34 is indicated at 34.

The webs of material are wound on the spreading roll 10 ', for example on the circumferential area 35 of the spreading roll 10', in which case spreading or axial displacement of the strips 30, 31, 32, 33 can also occur.

Assuming that the strip 30 passes in the central region 20 'of the spreading roller 10', then the passage of this strip 30 takes place in a straight line as shown in the figure. The axial transfer of the strips * 31-33, i.e. n 92682 to the right in Fig. 2, is carried out by means of the increasing spreading effect of the roll 10 ', i. the strip 32 moves more towards the right roll head 19 or 12 ', respectively, than the strip 31, while the strip 33 moves more than the strip 33.

This is due to the increased flexibility towards the roll end 19 of the annular lamellae 20 ', 20a, 20c and / or the corresponding design of the annular lamellae. As the strips 31, 32, 33 move towards the roll end 19, the increasing spreading or deviation, respectively, is shown in the figure as a greater deflection of the edges 31 ', 32', 33 'towards the roll head 19.

The application example shown in Fig. 2 can also be modified by placing a plurality of spreading ditches according to Fig. 1 on an adjacent passing shaft piece 11, whereby the web 28 is cut by cutting blades 29 before entering the spreading roll 10 'into four separate webs 30, 31, 32, 33. to the right and to the left, thus ensuring only that the cutting of the webs 30, 31, 32, 33 takes place in such a way that they do not overlap each other in the direction of the axis of the support shaft 11 even after application.

Claims (7)

92682 A spreading roller for guiding webs of material, comprising a support shaft (11) and a spreading roller cover (12) fixed to the support shaft (11), provided with a substantially cylindrical circumferential surface (14) through which annular cuts (15 ', 15a, 15b, 15c) pass. obliquely towards the support shaft (11) in a mirror image with respect to the axial central plane (18) of the spreading roller cover (12), at least one of the sections (15 ', 15a, 15b, 15c) running in one half of the spreading roller cover (12) being provided with a different depth compared to other sections, , that the sections (15a, 15b, 15c) have a smaller width (a) at their open end facing the circumference than at their end (b) facing their support shaft (11). Roll according to Claim 1, characterized in that the sections (15a, 15b, 15c) have an almost trapezoidal cross-section. Roll according to Claim 1 or 2, characterized in that the sections (15 ', 15a, 15b, 15c) run at an angle of 30 to 60 ° with respect to the support shaft (11). Roll according to one of Claims 1 to 3, characterized in that the sections (15 ', 15a, 15b, 15c) run at an angle of 40 to 50 ° with respect to the support shaft (11). Roll according to any one of claims 1 to 4, characterized in that the cuts 1a (15c, 15b) in the vicinity of each end (12 ', 12 ”) of the spreading roll cover (12) have a greater depth of cut than the central plane (18) of the spreading roll cover (12). ) (15b, 15a). Roll according to Claim 5, characterized in that the cuts (15 ', 15a, 15b, 15c) between the central plane (18) of the spreading roll cover (12) and 13 92682 each end (12', 12 ") have an increasing cutting depth. Roll according to any one of claims 1 to 6, characterized in that the cutting bases closest to the support shaft (11) and furthest from the support shaft (11) form an imaginary surface (26) extending approximately in the middle of the thickness of the spreading roller coating. 92682 P a t e n t k r a v: