FI108858B - The support roll-winding machine - Google Patents

Abstract

The known king roll reeling machines for shaftless winding of a web of material (4) divided by a lengthwise cut, in particular a web of paper of cardboard, onto sleeves (11) have take-up rollers (6) which are applied during take-up to two king rolls (2, 3) and are supported by guide heads (10) which can be inserted sideways into the sleeves of the two outer take-up rollers (6). The take-up rollers (6) can only be wound with high winding quality up to a maximum diameter. According to the invention, the space delimited by the king rolls (2, 3) and the take-up rollers (6) is sealed and an overpressure is produced in the space. To this end, sealing elements (18) which can be displaced axially to suit webs of different widths and which can be moved simultaneously in an area outside the area of movement of the guide heads (10) and their fastener (carriage (9)) are arranged in the region of the two side ends of the king rolls (2, 3). Frictional engagement between the king rolls is prevented when the sealing elements (15, 18) are in the sealing position.

Description

108858

Support Roller Roller - Stödvals Roller Mask

The invention relates to a support roller winding machine according to the preamble of claim 1.

Such support roll winding machines operate for axially winding webs of distributed material webs, in particular paper or board, onto rolls, whereby the rolls are aligned sequentially over the support rolls. In contrast to the so-called spindle winding 10, in which the spool of rolls is held in place by an axis passing through the sleeves, in the case of spindle-free winding, two guide heads are introduced from the outside to the outer rollers.

By means of a type of support-roll-winding machine known from DE-A 3 618 955, the rolls can be produced in the required roll quality up to a specified diameter. This is because the roll hardness of the roll is decisively influenced by the line loading (support weight over the width of the roll) on each of the support lines of the rolls against the support rollers.

The roll hardness should be as uniform as possible throughout the roll - 20 groups and across the diameter of each roll, and should have a predetermined value which is exceeded in known support roller rollers due to increasing support weight, thereby determining the maximum roll diameter .

In order to reduce the dead weight in support roller winding machines using roller shaft, DE-PS 11 11 496 discloses the development of overpressure in the space limited by support rollers and rollers. To seal the cavity laterally, • · ·, ·. • * * · · Ϊ0 movable sealing dampers in the form of support rolls that can be placed against the ends of the rollers. Bottom sealing is done by a roller or roll group on each support roller.

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The sealing elements disclosed in DE-PS 1 111 496 are not suitable for use in support roller winding machines with non-axial winding because they and their fastening elements are located in the range of motion of the guide heads. In addition, the leaning seal 5 provides a frictional connection between the two support rolls, which no longer permits the application of different torques to influence the roll quality.

The object of the invention is to provide a type of support roller winding machine which has a shaftless winding and which can produce rolls of large diameter and high quality of winding.

This object is solved by a support roller winding machine according to the invention, the essential features of which are set forth in the characterizing part of claim 1.

The support roller winding machine according to the invention has the advantage of off-axis winding (no complicated handling of heavy and long shafts, especially at high web widths; fast roll change) without the support weight being known to limit the maximum diameter of the roll. In addition, the relieving overpressure forms another setting parameter that can be used to control or adjust the winding hardness.

The dependent claims include preferred embodiments of the invention which are particularly preferred in this case:

Due to the pivotability of the bottom sealing elements, a free space is formed in the area below the support wire according to claim 2 ..... when the roller is changed from below, for a separation blade to be lifted through the support roll. Such separating knives may be used if feeding the web from below through a support roll.

3D patent claim 3 includes an embodiment in which the end sealing elements can be displaced axially out of the area of the support rolls. The displacement from the area of the guide heads is then effected either by means of a further outwardly extending axle.

In the Iin direction, or add down, as soon as they have left the support roller area.

Claims 4 to 6 contain embodiments of the invention in which the end sealing elements are removed in a reciprocal motion from the guide area. The splitting according to claim 5 has the advantage that less space is required for each pivoting movement. Thus, the sealing elements can already be used with smaller roll diameters, whereby the guide heads are still located far below the Alem-10; i.e., overpressure can be applied at an earlier stage of the winding to influence the quality of the winding.

The implementation of the rotary guides mounted on the pivot arms according to claim 6, in which the end sealing elements are mounted, is structurally advantageous and space-saving. The somewhat off-center pivoting of the pivot arm relative to the axis of the support roll outwardly in the required form then causes the sealing elements to be somewhat spaced away from the other support roll as they are pivoted over it.

... In this way, paper debris, for example, after paper stacking, can be removed without problems. In this case, the sealing elements are * · · secured either to the inner end of the circular guides, which in this case are mounted on the outwardly movable pivot arms, or the pivot arms are in the form of an angle with the vertex angle V!

; 25 In this case, swivel arms can be fitted with rotating guides that extend through the entire working width and to which the sealing elements · ...: are movably attached. Thus, · · · · · · · · · · · · · · · · · · · · · · · · ·, the guide rolls do not have to be moved over the support rollers to the maximum web width] · *.

; 30 The labyrinth sealing sealing elements of claim 10 allow sealing without the occurrence of friction with respect to the roller or support roll. In the embodiment according to claim 11, the sealing effect may be increased by supplying suppressive air.

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Claim 7 includes the implementation of sealing surfaces with sealing elements which achieve a high sealing effect with little friction.

The particularly advantageous embodiment of claims 8 to 11 allows lateral sealing with minimal compressed air losses at various overpressure values. The force balance between the support weight caused by the pneumatic piston-cylinder unit and the overpressure caused by the overpressure can be adjusted so that a minimum gap is automatically adjusted between the sealing element and the end faces of the outermost rollers 10. If the gap decreases or increases due to roller displacement, the overpressure will either increase or decrease so that the increased or decreased counter force will suppress the corrective movement of the sealing member.

According to claim 9, the pneumatic piston-cylinder unit preferably functions simultaneously for axially displacing the sealing elements to accommodate different web widths. In the embodiment of ... according to claim 10, an electric or hydraulic actuator is further provided for axial displacement 'do *.

• · ·

The pneumatic piston ram -.... of claim 11: the movable attachment of the blade unit perpendicular to the shafts: with respect to the guide parallel to the shaft ensures that the sealing elements can move freely in the guides.

Supplying compressed air from below with a support roller *: * ·: according to the invention allows, on the other hand, advantageously to place compressed air supplying elements below the support rolls,

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and, on the other hand, compressed air can be blown from below as additional airflow.

• 3K5 The lower sealing element can be lowered by impact or pivoting elements. This, on the other hand, works to remove the sealing elements from the support rolls, e.g., paper to remove debris after the paper has accumulated. That 108858 5 element can be lowered so far down that the end sealing elements arranged above the sealing element, as claimed in claim 3, are no longer located within the range of motion of the guide heads.

The winding of the material webs with the support roller winding machine according to the invention enables the rolls to be rolled over a very large diameter, whereby the adjustment or control of the winding hardness is greatly simplified since one of the decisive influences, namely the line loading on each contact line

The drawing serves to explain the invention by means of the simplified embodiments shown.

Figure 1 is a schematic side view of a support winding machine according to the invention.

Figures 2 and 3 show a partial cross-sectional view, respectively, in which the axial length of the air box is increased. *: ·. tions are different.

S · · · I «.

Figs. 4, 5 and 6, 7, respectively, show two other embodiments, side and top respectively, wherein only the parts essential to the invention are shown.

Fig. 8 schematically shows a side of a support roller winding machine, wherein the sealing elements '25 on the side can be pneumatically pressed against the outermost rollers.

Fig. 9 shows a top view of the winding machine of Fig. 8, Fig. 10 shows an enlarged part of Fig. 9.

The dual support roller winding machine, now described in detail 30 only in connection with the invention, has support rollers 2, 3 mounted on the machine body 1, spaced parallel to 108858 6 axes and extending over the entire working width, i.e., the largest width. The support rolls 2, 3 have either a different diameter, with the rotation axes slightly offset to the side I5 (Figures 1-3), or have the same diameter, with the rotation axes being in the same horizontal plane (Figures 4-10). The longitudinal cutting device 5 operates to divide the material web 4 into separate webs, which are made into rolls 6 which, when rolled, are aligned in succession on each of the support rolls 2, 3. The web 4 is fed to the winding position either from the bottom through the slot of the support roll (Figs. 1, 4, 8) or from the top and a short distance along the periphery of the other support roll (Fig. 6).

On both sides of the machine, a carriage 9 is mounted on the frame 1 with an upright and downwardly movable carriage 9 with piston-cylinder unit 8 mounted on the frame 1 to support the inwardly extending guide head 10. To guide the rollers 6 axially, 11 and remain there until the rollers 6 are rolled into a roll 20. In the empty sleeves 11 for inlet and for fitting to different web widths, the guide heads 10 are fixed to the carriages 9 by means of an actuator movable axially. For this purpose, the carriage 9 has a horizontally inwardly extending hollow cylindrical guide having an * * 25 axially displaceable pin with a spindle at its end. This structure is explained ·.! in detail, U.S. Patent 4,483,493.

The guides 7 extend outside the upper wedge-shaped area between the support rollers 2, 3 at a vertical distance of • 3'0 through the center of the support roller through the interconnection between the axes of the support rollers. They end just above the connecting line between the support rollers. The guide heads 10 can thus pass into the sleeves 11 which are in the wedge-shaped area between the support rollers 2, 3. As soon as the lower edges of the carriages 9 ”•• 35 with the sleeves 11 as the rollers 6 have moved sufficiently far upward along the guides 7, there is free space on each side of the machine above the support rollers 2, 3 to avoid collisions with the sealing elements described below.

5 To replace rollers, the machine is provided with a roll ejection bar 12 and a lowering plate 13, which receives the finished rolls 6 and lowers them for removal. When feeding the web from below, a separating blade 14 extending through the support roller can be provided below the support rolls 2, 3 to split the web 4, as shown in Figure 6.

To reduce the support weight of the rollers 6 against the support rollers 2, 3, an overpressure with compressed air can be applied to the space defined by the support rollers 2, 3 and rollers 6. For this purpose, the elements explained in more detail below will serve.

15 In the lower wedge-shaped space of the support rollers 2, 3, in all embodiments shown in the drawing, a compressed air-fed air box 15 extends at least over the smallest width of the web 4 and has upper openings for compressed air on the surface facing the rollers 6. - *: *. elements to calculate it. If a separating blade 14 that can be lifted through the support roller is provided below the support rolls 2, 3, the pivot arms 16 are attached to the air box 15 to allow a second lowering; A space under the support roller 25 (Figures 4 and 8 for support roller 3); for raising the separation blade 14. Without such a separation blade, the air box 15 is lowered by means of impact elements (impact cylinder 17) (Figs. 1, 6). The side surfaces facing the support rolls 2, 3 of the upper part of the air box 15 are curved in the support rolls ^: 0 2, 3, thus being free in the sealing position. only a small gap remains to avoid friction. The side surfaces have support! on the side facing the coils 2, 3, several more parallel. grooves transverse to the axes of the support roll which transverse through the direction of the outflow of compressed air, are used as labyrinth seals. The height of the sealing face 108858 is adapted to the required sealing power. The height on the side of the support roll 2, which moves towards the upper wedge-shaped area, may be lower than on the other sides because, due to the direction of rotation, air which protects against outflow is carried along with the support roll 2 or the web 4 on it.

In the embodiments of Figures 1-3, the upper side of the air box 15 acts as the same guide surface for the two end-sealing elements 18 movably secured on both sides of the machine to move the sealing elements 10 18 outwardly of the support rolls 2, 3. 2, as shown in Figures 2 and 3. the shape of the sealing element 18 on the front side is arranged 15, the supporting rollers of the free cross-sectional surface between the 2, 3, wherein the upper part is extended by a rectangular shape to above the hyphen between the support rollers 2, 3 act points to ensure an adequate sealing surface of large diameter rollers 6. The extended portion is the rollers 6 ends side grooves which, as described above, as a labyrinth seal, sufficiently reduce the loss of compressed air. The curved sides towards the support rolls 2, 3 are likewise provided with grooves. They pass; also transverse to the possible outflow, i.e. approximately the circumference of the adjacent support roller 2, 3.

: 25 The sealing elements 18 move sideways adjacent to the guides 7 so that they can be moved towards the end side of the rollers 6, leaving a small gap in the sealing station to prevent friction.

... For displacement of the support rolls 2, 3 axially, ♦ • 3 * 0 each of the sealing elements 18 is each fitted with non-illustrated transfer elements (e.g., a spindle to be used). In the embodiment of Figure 2, the sealing elements 18 can be moved so far outward that the carriage 9 may be lowered into a flange-shaped 108858 between the guide rollers 10, 10 for insertion into an empty sleeve 11 therein.

In the embodiment of Figure 3, the air box 15 and the sealing elements 18 can be lowered so that the upper edges of the sealing-5 elements 18 are located below the narrowest point between each support roll 2, 3. Thus, the air box must only to a lesser extent extend beyond the ends of the support rolls 2, 3. The axial movement of the sealing elements 18 against the outermost ends of the air box 15 then allows only the associated lowering - either downwardly or linearly lowered (Fig. 1) - which provides the clearance required for the carriage 9.

Figures 4-10 illustrate preferred embodiments of the invention wherein the end face sealing members 18 is moved tämällä pivot 15 in the direction of travel of the web and against - that is, the support roll 2 or 3 onto or out of - a control head 10 from the lower operating region. In this case, it is not necessary for the air box 15 to extend sideways to the outside of the support rolls 2, 3, and therefore its length approximately corresponds to the length of the support rolls 2, 3. To allow upward turning, the sealing elements 18 terminate at the narrowest point between the support rollers 2, 3. Correspondingly, the air box extends from below: up to this point. The sealing elements 18 are connected to each other on each side of the machine by the pivot arms 19, 20, * 2, 5 whose pivoting axes 21, 22 either coincide with the respective axis of the support roll or extend slightly eccentrically outwardly with the interconnection between the axis of each supporting roll. A slight eccentricity will cause the side surfaces of the sealing element 18 towards the support roll 2 or 3 ... respectively to move away from the surface of the respective support roll to remove, for example, paper ice. If the sealing elements 18 need to be moved further away from the support rolls, they are secured to the twin .. ··· beams. Also, in the embodiments of Figures 4-7, the support rolls 2, 3 and the sides of the sealing elements 18 and the air box 15 facing the end sides of the rollers 6 are provided with labyrinth seals as described above.

The embodiment of Figures 4 and 5, the 3 around the trailing support roller pivotable arm 19 of the machine either 5 each side of the one-piece sealing element 18. For this purpose, the levers 19 are in end angle bent so as to be between the TU-kitelojen 2, 3 in the tilted position extend approximately horizontally. At each of the pivoting ends of each pivoting arm 19, two rotary guides 23 are movably axially displaceable, the inner ends of which are provided with sealing elements 18. In the embodiment according to Figures 6 and 7, both end sealing elements 18 are divided along a vertical line at the center of the support roll. Each of the parts 24, 25 is mounted on a pivot arm 19, 15 20 which can be pivoted above the adjacent support roll 2, 3.

The pivoting movement thus requires less space, as shown in Figure 6, so that the sealing element 18 can be used at an earlier stage.

Also in the embodiment of Figs. 8-10, the sealing elements 18 are axially - i.e. across the web 4 - removably mounted on pivoting arms 19 about the output support roller 3. They can be moved away from the lower operating area of the guide heads 10 by rotating over the support roller 3. 8 drawn with dotted lines). The pivot arms 19 are> 25 free to release so that they extend approximately horizontally * * · in the pivoted position between the support rollers 2, 3. Their pivot axis 25 traverses somewhat centrally outwardly with a connecting line between the axes of each support roll. A slight eccentricity results in the sidewalls of the sealing elements 18 facing the support rolls 2 and 3, respectively, to move away from the surface of each support roll: *, · to remove, for example, paper residue. At each of the bent ends 23 of the pivoting arm 19 of the rubber arm, two rotary guides 23 are mounted, which are displaceable in the axial direction, the inner ends of which are sealed by sealing elements 11 108858. For axial displacement of the sealing elements 18 and to be pressed against the ends of the outer rollers 6, the piston 26 of the pneumatic piston-cylinder unit is mounted above the pivoting arm 19. The end 27 of the piston rod 5 is mounted perpendicularly to each of the shafts on the guides 23 in a sealing member 18. To this end, a shaft 28 is inserted in each case above the sealing member 18 and passed through the opening of the piston rod 27. pneumonia | the piston-cylinder unit 26, 27 is an axial displacement of the sealing element 10 and an adjustable compression pin! for adjusting it, connected to an adjusting device not shown.

In the present embodiment, the piston-cylinder unit 26, 27 serves both to move the sealing elements 18 axially 15 to fit different web widths and to press them against the rolls 6. Similarly, it is possible that these two functions are performed by separate actuators. Thereby an electric or hydraulic actuator 20 is connected to the pivot arms 19 for axial displacement, which is connected to the sealing elements 18 via pneumatic piston-cylinder units 26, 27.

•:: In the non-illustrated embodiment of the invention, the pivot arms carrying the sealing elements 18 are angled at an angle, the point of the angle being located on the outer side of the support rolls 2, 3. The support rolls 2, • ·; 3 full length guides with sealing elements

1 · I

The tit 18 removably is bearing. Thus, the guides are no longer * · 'shifted axially to set different web widths.

• '' 3; 0 After the new sleeve 11 is placed on top of the support roll. the guide heads 10 are driven into place. Start of Rain 4 •; after being secured to the sleeves and lowering the pressure roller 24, the winding begins.

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As long as the support weight of the rollers 6 is not sufficient for the desired roll hardness, the pressure roller 26 is further pressed towards the support rolls 2, 3. As soon as the support weight becomes too high, overpressure is created in the confined mass state of the support rolls 2, 3 and rollers 6 by supplying compressed air, which reduces the support weight. At present, the rollers 6 already have a sufficiently large diameter (about 800 mm) so that their cores 11, and thus the carriage 9, are located at a sufficient distance above the support rollers 2, 3 to avoid collision with the sealing elements 18. The rollers 6 and the support rollers 2, To seal the space 3, the air box 15 is first moved upwardly into the wedge-shaped space between the support rolls 2, 3 so that the side surfaces of the air box 15 meet the support rollers 2, 3 with a small gap and thereby seal from below. Thereafter, the sealing elements 18 of the end face 15 are moved upward and so far inward until only a small gap remains at the ends of the rollers 6, and thus these sides are also sealed. Compressed air is now passed through the air box 15 until sufficient pressure is created under the rollers 6 to reduce the support weight 20 of the rollers 6 to the desired extent.

In the embodiment of Figs. 8-10, compressed air is first supplied through a raised air box 15, and then the sealing elements 18 are moved axially towards the ends of the rollers 6 by a piston-cylinder assembly 27. The pressure of the pistons 26: 25 is then controlled so that a balance of power is achieved: "· Due to the overpressure formed, there is a small gap between the sealing elements 18 and the rollers 6. This prevents friction with minimal compressed air losses. If the gap width increases or decreases due to, for example, axial displacement of the rollers •• 3.0, the overpressure under rollers 6 decreases or · * 'increases due to increasing or decreasing compressed air losses.

The resulting difference in pressure of the pneumatic piston cylinder unit:. '' I 26, 27 automatically results in a gap width: '! until the balance of power is reached again.

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Alternatively, a small gap between the sealing elements 18 and the rollers 6 may also be maintained by automatically adjusting a smaller distance from the position of the guide heads 10.

Preferably, the support weight of the rollers 6 is kept constant during the winding 5. By means of the adjusting or controlling device, the overpressure under the rollers 6 is then increased from the desired support weight so that the weight increase is continuously compensated. Thus, the adjustment or control of the roll hardness is greatly simplified, since the crucially influential quantities, namely the line-10 loads on each of the contact lines between the rollers 6 and the support rolls 2, 3, no longer change.

Alternatively, the lowering of the supporting weight may be achieved by generating a corresponding overpressure also in steps to maintain the supporting weight within a defined range. Likewise, the increase in support weight 15 can only be partially offset, or the reduction may be in accordance with a predetermined function. A simple reduction around a constant value may be sufficient. In any case, creating the overpressure provides another parameter for controlling the hardness of the rolls 6.

In the embodiment of Figures 8-10, the adjusting device also increases the pressure of the pneumatic piston-cylinder units 26, 27 in response to increasing overpressure so that the distance between the sealing elements 18 and rollers 6 remains constant.

Instead of sealing surfaces in the upper and lower wedge-shaped areas between the support rollers 2, 3 and in the lower wedge-shaped area, sealing can be effected at suitably selected compressed air outlet openings by means of blocking air. Likewise, the sealing effect of labyrinth seals can be increased by supplying air to their grooves. With the support rollers 2, 3 very close to the organization, it may be sufficient that = =.

*. *: Compressed air is blown through the slit nozzle through the narrowest * point. The compressed air blown from below then acts as a barrier air to reduce losses through the narrow gap between the support rolls 2, 3.

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It is also possible to use sealing elements such as brushes, rubber lips, felt strips, etc., as long as the friction against the support rolls 2, 3 and rollers 6 can be kept sufficiently low; either so that the sealing elements rest on the rollers 6 and the support rolls 2, 3 with a low friction or are positioned at such a small distance that the compressed air losses are acceptable. In this case, it is important that the sealing elements do not adversely affect the support rolls 2, 3! and, in particular, they do not cause any frictional contact between the support rolls 2, 3. Otherwise, it will no longer be possible to sufficiently adjust the various torques of the support rolls 2, 3 necessary to influence the roll quality.

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Claims (11)

A support roll rolling machine for rolling a web of material (4), in particular a web of paper or paperboard, comprising: a) two support rolls (2, 3) on which the roll (6) rests during rolling, b) means (15, 18) for sealing the space delimited by the support rollers (2, 3) and the roller (6) and for generating overpressure therein, the means comprising 10 b 1) sealing elements (18) at the ends, b 1) arranged within the area of the side rolls of the support rolls. , which seal at least the cross-sectional area of the Upper Wedge between the support rollers, and bl2) which are axially movable to accommodate different web widths, b2) and an air guide (15), | b21) which is arranged within the region of the lower wedge between the support rollers (2, 3), b22) extends over the working area of the machine; · b23) has compressed air supply and in the upper boundary area against the roller (6) has an outlet for compressed air; and: b24) sealing the support roll gap from below to the support rollers (2, 3) with sealing elements, which do not form a friction-producing contact between the support rolls,: '125 can be seen that' · '(c) seen in the runway direction in front of the support rollers (2) ) a longitudinal cutting device (5) is arranged to divide the material web (4) into separate webs, which are then wound onto sleeves (11), d) on each end surface of the support rollers (2, 3) a guide head ( 10) which can be lowered within the range of the upper wedge between the support rollers, the guide heads being able to be inserted into each outer sleeve (11) to fully roll the rollers (6), | The sealing elements (18) at the ends can be simultaneously moved outside the range of motion of the control head (10) and their clamping, and b25) the air ladder (15) is stored downwardly adjustable. Support roll rolling machine according to claim 1, characterized in that the air ladder (15) can be turned down within the area under the support roll. Support roller rolling machine according to claim 1 or 2, characterized in that the air ladder (15) extends over the ends of the support rollers (2, 3) and that the sealing elements (18) at the ends 15 are axially movable on its upper side. 4. Support roll rolling machine according to claim 1 or 2, characterized in that the sealing elements are stored at the ends turned in reverse. directly over the second support roll (2, 3). 5. Support roll rolling machine according to claim 4, characterized. : That the sealing elements (18) at the ends are divided into sections, whereby each section (24 and 25, respectively) can be turned over the second support roll (2, 3). ; 6. Support roller rolling machine according to claim 4 or 5, characterized in that the sealing elements (18) at the ends are stored in V · 25 circular guides (23), which run parallel to the axes of the support rollers, whereby the circular guides (23) are mounted at · ··: rotary shaft (19 and 20, respectively) on the sides, whose rotary shaft (21) runs along the axis of the second support roller or slightly eccentrically towards, the connecting line between the axes of the support rollers is displaced slightly laterally. 108858 20 Support roller rolling machine according to any of claims 1-6, characterized in that the sealing is carried out with the aid of sealing elements attached to the sealing surfaces of the sealing elements (15, 18), such as brushes, rubber flanges, felt strips, which support with layer 5 friction against the rollers (6). and the support rollers (2, 3) or which are placed at short distances therefrom. Support roller rolling machine according to any of claims 1-7, characterized in that the axially movable sealing elements (18) can be pressed against the ends of the outermost rollers (6) with a controllable pneumatic piston cylinder unit (26, 27). Support roller rolling machine according to claim 8, characterized in that the pneumatic piston cylinder unit (26, 27) simultaneously functions to move the sealing elements (18) axially for different path widths. Support roll rolling machine according to claim 8, characterized by a further electrically or hydraulically driven device for axially moving the sealing elements (18). Support roller rolling machine according to any of claims 8-10, characterized in that the sealing elements (18) are stored on the sides parallel to the axis of the support roller in a guide (23), and that the pneumatic piston cylinder unit (26, 27) is fixed to the sealing element (18). that it moves perpendicularly around the axis of the relative to the guide (23). 1 *