WO1993015007A1

WO1993015007A1 - Process and machine for winding a paper or cardboard web

Info

Publication number: WO1993015007A1
Application number: PCT/EP1993/000018
Authority: WO
Inventors: Ewald Georg Welp; Herbert Schönmeier; Luzian Kies
Original assignee: Jagenberg Aktiengesellschaft
Priority date: 1992-01-24
Filing date: 1993-01-08
Publication date: 1993-08-05
Also published as: EP0632788A1; CA2124827A1; JPH06511219A; FI943482A; FI943482A0; DE4201815A1; DE4219415A1

Abstract

In winding a paper or cardboard web (1) separated by longitudinal cuts on winding spindles it is known to hold each winding roll (3) during winding by two guide heads (5) inserted into both sides of the winding spindle, the guide heads (5) supporting at least part of the roll weight. According to the invention, the winding rolls (3) are supported beneath their centres of gravity at the latest from a winding roll diameter of 1000 mm in such a way that the load applied by the roll weight on the two guide heads does not exceed 15000 Newtons per metre of roll width. In order to reduce the roll weight bearing on the guide heads (5) by means of overpressure generated by compressed air, in a winding machine of the invention, there are sealing components (25, 27, 29, 30, 35, 42, 44, 45) beneath a winding roll which form beneath the centre of gravity of the roll a pressure chamber which is closed at the top by the underside of the winding roll (3) and can be adapted to different roll widths and positions.

Description

DESCRIPTION

Method and machine for winding a paper or cardboard web

Technical field

The invention relates to a method for winding a paper or cardboard web divided by longitudinal cutting onto winding cores according to the preamble of patent claim 1 and a winding machine for winding a paper or cardboard web according to the preamble of patent claim 4.

In paper production, such processes and winding machines serve to produce winding rolls with the dimensions and winding qualities required for later processing, in particular for printing. The paper or cardboard web drawn off from a supply roll is divided by longitudinal section into individual webs, which are then wound onto winding tubes.

State of the art

In order to produce heavy winding rolls, a generic method and a generic device are known from DE-PS 37 19 093, in which the winding rolls in individual winding stations when winding from both sides in the winding sleeves are retractable guide heads. They are driven by a central support roller, on which they rest circumferentially. The guide heads bear all or part of the roll weight in order to keep the line force at the contact line with the back-up roll, which is decisive for the winding quality, within a desired low range.

It has been shown that with the known winding machines, the dimensions of the finished winding rolls cannot be increased beyond a certain size without roll defects and / or quality reductions occurring. In the production of large rolls from SC or LWC paper for rotogravure printing presses, depending on the type of paper from a roll diameter of more than 1000 mm and a roll width of more than 2 m, space and crepe folds in the area of the roll core, especially in close to the guide heads.

Presentation of the invention

The invention has for its object to improve a generic method and a generic winding machine so that large winding rolls with more than 1000 mm in diameter and a width of more than 2 m can be produced without error in the required winding quality.

This object is achieved with the features of claim 1 and claim 4.

It has been shown that places and crepe folds can be avoided in the core area of a heavy winding roll if the roll weight on the guide heads does not exceed a certain value in relation to the roll width. Another advantage is that in winding machines with a central support roller on which the winding rollers rest during winding, the line force at the line of contact over the width of the rollers can be evened out for better winding quality. Large roll weights, which are carried by the two lateral guide heads, lead to bending of the winding roll and thus to an uneven line force across the roll width. The subclaims contain preferred, since particularly advantageous, configurations of a winding machine according to the invention.

According to claim 2, the weight of the roller on the guide heads is reduced by a static excess pressure built up below the winding rollers. In the particularly advantageous variant according to claim 3, the variable which brings about a weight relief, in particular the level of the excess pressure, also serves as a manipulated variable for controlling or regulating the winding process. The overpressure is preferably set so that the line load on the support line on the winding rollers on the support roller has a desired value depending on the diameter.

The claims 5 to 14 contain embodiments of winding machines, in which the winding stations are arranged on both sides of a roller, on the winding rollers abut circumferentially during winding. A pressure space with sealing elements that circumferentially seal the winding roller is created below each winding roller and is delimited on one side by the roller.

According to claims 7 to 9, the lower sealing plate is particularly advantageous in terms of construction, being formed by part of the roller receiving platform of an already existing roller lowering device, which also carries the outer sealing element according to claim 8.

The claims 10 and 1 1 contain embodiments of the invention in which the side sealing elements are attached to the movable support members and are thus automatically positioned with them when setting the roll width. According to claim 11, the lateral sealing elements can be moved from the range of motion of the guide heads, so that they can be moved up to the support roller at the beginning of the winding and at the same time the area on the lay line with the side sealing elements can be sealed later if the guide heads are larger The winding roll diameter is at a sufficient distance from the support roller. In the embodiments according to claims 12 and 13, the lateral sealing elements are mounted on a lateral cross-member of the winding machine so as to be adjustable in a transverse manner to adapt to different roll widths and positions. They are pivoted into their sealing position against the support roller. If the winding machine has pressure rollers mounted on lateral crossbeams, the lateral sealing elements in the embodiment according to claim 13 are fastened to the slide for the pressure rollers and thus positioned with them.

The supply of compressed air into the pressure chamber via the lateral sealing elements according to claim 14 has the great advantage that each pressure chamber can be acted upon with compressed air regardless of its width and its position transverse to the web; the compressed air supply is automatically positioned when the lateral sealing elements are adjusted.

Claims 15 to 24 contain embodiments of the invention in which an air box with a compressed air supply, which is at least partially open at the top, is arranged below a winding roll, the open area of the upper side (printing area) being closed off from the underside of the winding roll, that is to say the jacket surface thereof.

Each winding station has its own air box, which is adjustable transversely to the direction of web travel, or a continuous air box extends over the entire working width on each side, which is divided into individual air chambers that can be pressurized with compressed air (claim 17). The individual air chambers are either sealed with bulkhead-like partition plates that can be moved transversely to the web in order to be able to adapt their width and position to the roll width and position (claim 18), or there are a large number of narrow air chambers lying next to one another, each of which is located in the area air chambers located in a winding roll can be activated.

In order to keep the compressed air losses as low as possible, the sealing elements extending in the direction of web travel are approximately circular-arc-shaped. adapted to the circumference of a winding roll, curved. In the particularly advantageous embodiment according to claim 20, these sealing elements are elastically deformable and can be adapted to the changing curvature of the outer surface of a winding roller in order to keep the compressed air losses in the entire working area as low as possible while avoiding contact with the winding roller.

The embodiment according to claim 21 with a freely rotatable roller parallel to the winding roller axis as the outer sealing element enables precise positioning of the top of the air box at the smallest possible distance from the winding roller. The freely rotatable roll can create friction on the winding roll and at the same time determines the distance of the other sealing elements from the underside of the winding roll.

In the embodiment according to claim 22, the air box is height-adjustable on its underside and pivoted about an axis parallel to the winding roller axis so that it can be adapted exactly to the position of a winding roller. The transverse walls parallel to the winding roller axis carry on their upper side freely rotatable, freely rotatable rollers which can be placed on the winding rollers and which seal in the web running direction at the front and rear. When the freely rotatable rolls are placed on the winding rolls, the position of the sealing elements extending in the direction of web travel is defined at a minimum distance from the winding rolls.

Claims 23 and 24 contain structurally particularly advantageous configurations of winding machines with back-up rolls, in which the air boxes are integrated into an existing roll lowering device.

Brief description of the drawing

The drawing serves to explain the invention on the basis of simplified exemplary embodiments. Fig. 1 shows a side view of a backup roller winding machine with sealing elements, which are partly mounted on the winding trestles, partly on the lowering platform.

FIG. 2 shows an enlarged detail from FIG. 1.

FIG. 3 shows a section along the line A-B of FIG. 2.

4 shows a side view of a section of a support roller winding machine with lateral sealing elements which are pivotably mounted on a lateral crossmember.

Fig. 5 shows a section of a support roller winding machine with an air box integrated in the lowering device.

Fig. 6 shows a section through an air box, which is built up from a plurality of adjacent air chambers.

Fig. 7 shows the section through a box-shaped

Lowering device that is also used as an air box.

Fig. 8 shows a height-adjustable and pivoted air box with freely rotatable rollers as sealing elements.

Ways of Carrying Out the Invention

The winding machine shown in FIG. 1 is a back-up roll winding machine in which the paper or cardboard web 1, which is several meters wide, is drawn off from a supply roll 2 suspended in a roll, divided into individual webs by slitting and then wound up into winding sheets 3. During winding, the winding rolls 3 lie alternately on both sides of the apex line of a driven support roller 4. They are each held by two rotatable guide heads 5 which are inserted into the winding sleeves on both sides and carry at least part of the roll weight. The Guide heads 5 are fastened to carriages 6, which are mounted on supporting elements (winding blocks 7) and can be moved approximately radially to the support roller 4. In each case two of the winding blocks 7, which can be moved transversely to the web 1 to adapt to different web widths, form a winding station on which a winding roll

3 is wound up.

The web 1 is guided by means of guide rollers 8 to 12 under the floor from the unwind to the area below the support roller 4, where a longitudinal cutting device 13 consisting of several pairs of circular knives is arranged, which it divides into several individual webs. The web 1 is fed from the longitudinal cutting device 13 to the partially wrapped support roller 4, which alternately leads the individual webs to the winding stations on both sides. At a distance from the backup roller

4 are arranged on both sides in the frame 14 of the winding machine crossbars 15, 16 which can be raised and lowered, on each of which a slide 17, 18 per winding station is mounted so as to be movable transversely to the web 1. On each sled 17,

18 is a pivot arm 19, 20 articulated, which carries at its end a pair of pressure rollers 21, 22 which can be pivoted against the circumference of the winding roller 3 in order to, at the beginning of the winding, when the support weight is not yet sufficient, the line force at the contact line of the winding roller 3 on the support roller 4 for a higher winding hardness.

A roll lowering device 23, 24 is arranged on each side next to the support roller 4 and can be raised to the underside of the finished wound winding rolls 3 by means of a lifting cylinder 46 and lowered to the floor level. Below each winding roll 3, sealing elements are arranged which form a pressure space below the center of gravity of the winding rolls 3, which is closed on its upper side by the underside of the respective winding roll 3 and in which an overpressure can be generated by means of compressed air. In the embodiment according to FIGS. 1 to 3, the sealing elements are partly fastened to the lowering devices 23, 24, partly to the winding frames 7. In Fig. 1, the sealing elements are shown only on the right side of the support roller 4; Although not shown, the lowering device 23 on the left side of the support roller 4 is a mirror image of the lowering device 24 constructed, likewise the winding rollers 3 arranged on the left side of the support roller 4 are sealed with the sealing elements shown on the right side on their underside.

The structure and arrangement of the sealing elements for forming the pressure chamber is shown in more detail in FIGS. 2 and 3:

Below each winding roller 3 there is a sealing plate 25 which seals downwards, the width of which transversely to the web 1 is greater than the maximum width of a winding roller 3. The sealing plate 25 extends from the support roller 2 approximately radially - in FIG. 2 approximately horizontally from left to right - up to the lowest point of a winding roll 3, which has the maximum diameter. In the present exemplary embodiment, the sealing plate 25 extends over the entire working width, it thus seals the underside of all the winding rollers 3 of a winding line together downwards. Alternatively, a separate sealing plate can be provided for each winding station, the width of which is in each case greater than the maximum winding roll width and which is mounted in the frame of the winding machine so as to be movable transversely to the web 1 in order to adapt to different winding roll positions and widths. Individual sealing plates 25 can be useful if winding rollers 3 with different diameters are to be wound on one side.

According to the exemplary embodiment shown in FIG. 2, part of the roll receiving platform of the roll lowering device 24 is advantageously also designed as a sealing plate 25. The lowering device 24 is designed in two parts, the part 24.2 facing away from the support roller 4 being adjustable in height relative to the other part 24.1 in order to form a receiving trough for the winding rolls 3 when the winding rolls 3 are unloaded. On the upper side of the outer part 24.2, an outer sealing element 27 is fastened movably in the direction of the support roller 4 and back, the width of which is transverse to the web 1 and greater than the maximum width of the winding roller; in the present example, it extends as a common sealing element 27 for all winding rolls 3 over the entire working width of the winding machine. Analogous to the lower sealing plate 25, individual outer ones can alternatively be used for each winding station Sealing elements are used, which are then mounted so that they can be adjusted to different winding roll positions.

The entire roller lowering device 24 with the sealing plate 25 and the sealing element 27 is mounted on side pivot levers 28, on which the lifting cylinders 46 engage, pivoted up to the underside of a winding roller 3 and can be lowered to the corridor level so that the inner edge of the sealing plate 25 is located at Swiveling up with the smallest possible distance parallel to the circumference of the support roller 4 moved approximately on a circular path.

The sealing on the end faces of the winding rollers 3 is carried out with two lateral sealing elements 29, 30, which in the exemplary embodiment according to FIG. 2 are each fastened to the end of the supporting elements (winding blocks 7) with the guide heads 5 on the support roller 4. The lower edge of the cheek-shaped sealing elements 29, 30 extends parallel to the sealing plates 25, and their height is selected so that in the sealing position on the end faces of each winding roller 3 the opening delimited by the winding roller 3, the support roller 4 and the lower sealing plate 25 seal the diameter range provided for relief with overpressure. Since the carriages 6 with the guide heads 5 are located in the region of the line of contact of the winding roll 3 on the support roller 4 at the start of the winding up, and this region is later to be sealed, with larger diameters, the lateral sealing elements 29, 30 are out the range of motion of the carriage 6 movably attached to the winding blocks 7. For this purpose, the sealing elements 29, 30 are each slidably mounted on the inside of a plate 31 fastened to the outside of the winding blocks 7 parallel to the end faces of the winding rollers 3. The displacement of the sealing elements 29, 30 into the sealing position and out of the area of the slide 6 takes place in each case with a piston-cylinder unit 32 which is fastened to the inside of the sheet 31. In Fig. 3, the sealing element 29 shown above is shown in the waiting position outside the range of movement of the carriage 6, the sealing element 30 shown below in the sealing position. The position of the inner surface of the sealing elements 29, 30 relative to the guide heads 5 is selected such that they have their sealing position when the guide heads 5 are inserted into the winding sleeves take on the end faces of the winding rolls 3; ie their distance is so small that there is no friction with the winding roll 3 and at the same time the compressed air losses are negligible.

One of the two lateral sealing elements 29, 30 is connected to a compressed air supply, not shown, and has an outlet opening for compressed air on the inside in the lower region, in order to be limited by the winding roller 3, the support roller 4, the sealing plate 25 and the outer sealing element 27 Pressure chamber to generate an overpressure.

The overpressure below a winding roll 3 is generated when the winding rolls 3, depending on their width, have reached such a large diameter that there is a risk that roll defects, in particular crepe folds and core spaces, will occur. For this purpose, a pressure chamber is formed at the latest from a winding roll diameter of 1000 mm below the center of gravity of the winding roll 3, in that the roll lowering device 24 with the sealing plate 25 is pivoted up to just below the lowest point of a winding roll 3 with the maximum diameter. The sealing plate lies down

29 sealingly against the underside of the two lateral sealing elements 30, 31, which are already at the small distance from the winding rollers 3 required for sealing against the end faces, since they were automatically positioned with the winding brackets 7. The lateral sealing elements 30, 31 are now displaced on the sealing plate 25 in the direction of the support roller 4 to a minimal distance from it, then the outer part 24.2 of the lowering device is moved upward and the sealing element 27 fastened thereon to a minimal distance from the lateral surface the winding roller 3 moved to close the pressure chamber.

By introducing compressed air into the pressure chamber via one of the side parts 29,

30 at the latest from a roll diameter of 1000 mm below the winding roll 3, an overpressure is generated which is controlled or regulated so that the roll weight on the two guide heads 5 does not exceed a value of 15,000 N / m roll width. With very sensitive papers, e.g. B. with high quality double coated graphic papers, it can be appropriate to let the relief of the guide heads 5 begin earlier and to set the remaining roll weight on them to a lower value; in particular if a very uniform line load at the contact line of the winding rollers 3 on the support roller 4 is required for a very good quality of winding, that is to say even the smallest deflections of the winding rollers 3 due to the roller weights on the guide heads 5 should be avoided. In this way, winding rolls 3 with a diameter of up to 1500 mm and a roll width of up to 3600 mm can be produced without errors and with high winding quality. Relief of the roll weight on the guide heads 5 by the overpressure below the wicker rolls 3 takes place according to a simple variant such that the roll weight on the guide heads 5 is kept constant.

In winding processes in which the winding rolls 3 rest on a support roller that partially supports the roll weight, there is a further parameter available through the weight relief with which the winding process can be controlled or regulated. Since the winding hardness (= surface pressure between the individual winding layers) is decisively influenced by the line load on the contact line of the winding roller 3 on the support roller 4, it can be adjusted via the size of the weight relief. The variable which brings about a weight relief - in the present example the level of the excess pressure - is changed as a manipulated variable for controlling or regulating the winding process in such a way that a desired line load which is dependent on the winding roll diameter is set. The overpressure is controlled either directly or via the position of the sealing elements, e.g. B. by pressing them with an adjustable pressure towards the winding roll 3.

According to another embodiment shown in detail in FIG. 4, the lateral sealing elements 33 sealing on the end faces of the winding rollers 3 are transversely adjustable on both sides of the support roller 4 on a lateral crossbar of the winding machine and are pivotably supported against the support roller 4. For the sake of simplicity, FIG. 4 shows only those that have been changed compared to the embodiment according to FIGS. 1 to 3 and for this embodiment important elements. Otherwise, the winding machine is constructed as described in FIG. 1 and above, identical parts also have the same reference numbers.

In the embodiment shown in FIG. 4, the shield-shaped lateral sealing elements 33 are advantageously each fastened to the end of a swivel arm 34 which is articulated on the carriage 18 for the pressure rollers 22 of the respective winding station. In this way, the sealing elements 33 with the pressure roller carriages 18 can be positioned transversely to the web 1; no separate positioning devices are required. The sealing elements 33 can be pivoted on the one hand up to the support roller 4, and on the other hand can be pivoted back into a waiting position outside the maximum diameter of a winding roll 3 so that they can be lowered and unloaded by the roll lowering device 24. In this embodiment, not only the roller receiving platform 24.1 of the front part of the roller lowering device 24, but also the roller receiving platform of the outer part 24.2 is designed as a lower sealing plate 25. The two parts 24.1, 24.2 of the roll lowering device can be pivoted at an obtuse angle to form a receiving trough for the winding rolls 3. The outer wall of the outer part 24.2 facing away from the support roller 4 is curved in the shape of a circular arc, and on it an outer sealing element 35 which extends over the working width and is displaceably fastened in the direction of the support roller 4 and back. The lower edges of the lateral sealing elements 33 are bluntly angled to match the sealing surfaces 25, so that they can be seated thereon in a sealing manner. At its end facing away from the support roller 4, its upper edges are adapted to the outer sealing elements 35 so as to be curved in a circular arc, so that they can be pushed sealingly over the upper edges and moved with their front edge against the outer surface of the winding rolls 3. The circular arc-shaped upper edge of the sealing elements 33 extends in the direction of the support roller 4 up to the diameter of a winding roller 3.1, in which the pressure on the guide heads 5 should start with compressed air.

In order to form a pressure space below the center of gravity of the winding rolls 3, the roll lowering device 24 is moved up to a short distance below the the lowest point of a winding roll 3 with a maximum diameter, the outer part 24.2 being angled to the inner part 24.1. The shield-shaped lateral sealing elements 33 are then pivoted in the direction of the counter-roller 4 and are seated on the sealing surfaces 25 in a sealing manner. Its front end is at the smallest possible distance from the support roller 4 and thus seals the area up to the line of contact of the winding roller 3 on the support roller 4. The outer sealing element 35 is then pushed in the direction of the support roller 4 to a minimal distance from the outer surface of the winding roller 3 and thus seals the opening which faces away from the ends of the sealing elements 33 facing away from the supporting roller 4, the outer surface of the winding roller 3 and the sealing plate 25 is limited. The pressure chamber below the winding roll 3 is closed. In this embodiment, too, the compressed air is supplied via the lateral sealing elements 33, so that the compressed air supply is automatically positioned with an adjustment transverse to the path 1 of the sealing elements 33. Relief of the roller weight on the guide heads 5 takes place in the manner described in the embodiment according to FIGS. 1 to 3.

5 shows an embodiment of a winding machine according to the invention, in which an air box 36, which is at least partially open at the top and has at least one compressed air supply, is arranged below a winding roller 3. The open area of the upper side (pressure area 37) of the air box 36 is limited by sealing elements which bear against the underside of the winding roll 3 and which can be adapted to different roll widths and positions. Each winding station is assigned an air box that is adjustable transversely to the web 1 to adapt to different roll widths and positions, or - as shown in FIGS. 5 to 7 - a continuous air box 36 extends on each side of the support roller 4 over the entire length Working width, which is divided into individual, separately pressurized air chambers 38.

The air box 36 is advantageously installed in the front part 24. 1 of the roller lowering device 24, which is adjacent to the support roller 4 and can be raised and lowered next to the support roller 4. The lowering device 24 is - as in described in the previous embodiments - also pivotally mounted on side swivel arms 28 from the floor level to the underside of a winding roller 3, the edge of the front part 24.1 adjacent to the support roller 4 being at a short distance from the support roller 4 and parallel to its circumference upwards emotional.

In the embodiment according to FIG. 6, the air box 36 consists of a plurality of air chambers 38 arranged side by side, which are arranged in the box-shaped sheet metal construction of the front part 24.1 of the lowering device 24. Each of the air chambers 38 has a compressed air supply 39 and is mounted within the lowering device 24 so that it can be swiveled up by means of a piston-cylinder unit 40. The pivot bearings are each arranged at the top on the inside of the transverse wall of the lowering device 24 adjacent to the support roller 4, the pivot axes 41 running parallel to the winding roller axes and thus to the support roller axis.

In the embodiment according to FIG. 7, the box-shaped sheet metal construction of the front part 24.1 of the lowering device 24 is used directly as an air box 36. In order to be able to divide the air box 36 into individually activatable air chambers 38, the position and width of which can be adapted to the respective winding roll position and width, 36 bulkhead-like separating plates 42 are arranged within the air box. Either dividing plates 42 are at fixed intervals, z. B. every 200 mm, welded, each air chamber 38 thus formed has its own compressed air supply 39. The adaptation to the roll width and position is then carried out by activating the respective compressed air supply 39. Or, as shown in FIG. 7, the separating plates 42 are slidably mounted within the lowering device 24 transversely to the web 1 on a round guide 43. By positioning the separating plates 42, air chambers 38 can now be formed at the desired positions, the width of which corresponds to the width of the winding rolls. At regular intervals, e.g. B. every 200 mm, a compressed air supply 39 is connected so that the pressure chambers 38 formed can be acted upon with compressed air at all possible positions. In all of the embodiments, the air boxes 36 are at least partially open at the top, the open area of the top (pressure area 37) being limited by sealing elements which bear against the underside of the winding roll in a friction-free manner. The sealing elements 44 extending in the web running direction - in the present example sealing strips - are adapted to the circumference of a winding roll 3 and are curved approximately in a circular arc. The sealing strips 44 are preferably made elastically deformable with specially adapted bending cross sections, and their curvature can be adapted to the curvature of the winding roller 3, which changes as the diameter increases, in order to minimize the compressed air losses. The curvature is adjusted by means of adjusting elements which are arranged in the interior of the air box 36 and accordingly bend the sealing strips 44. With a suitable choice of the initial curvature of the sealing strips 44 and their prestressing, a single, centrally acting adjusting element is sufficient to track the radius of curvature accordingly.

While the sealing across the web 1 on the side adjacent to the support roller 4 also takes place by means of one or more sealing strips, preferably by means of a sealing strip which is continuously attached to the top of the air box 36 or the air chambers 38, one or more seal freely on the opposite side rotatable rollers 45 as outer sealing elements against the outer surface of the winding roller 3. In the embodiment according to FIG. 6, a roller 45 is fastened to the upper side of the outer transverse wall of the air chamber 38, in the embodiment according to FIG. 7 a continuous roller 45 extends over the entire working width, which on the front part 24.1 of the lowering device 24 final transverse wall is attached. The freely rotatable rollers 45 are arranged in such a way that when the air chambers 38 swivel against the outer surface of the winding rollers 3, a narrow gap is established between the lateral sealing elements 44 and the winding roller 3 when the rollers 45 contact the winding rollers 3. In this way, they keep the air chambers 38 at a minimal distance and thus avoid friction between the lateral sealing elements 44 and the winding rollers 3. While in the embodiment according to FIG. 7 the lowering device 24 with the air chambers 38 to form a pressure space below the winding rollers 3 is pivoted up by means of the lifting cylinder 46 directly into the sealing position, i.e. until the freely rotatable rollers 45 are applied, the lifting cylinder 46 pivots 6, the lowering device 24 initially up to a starting position in which the lateral sealing elements 44 are still at a certain distance from the winding rolls 3. Subsequently, the piston-cylinder units 40 pivot the pressure chambers 38 located in the area of winding rollers 3 into their sealing position, in which the rollers 45 bear against the winding rollers 3 and the sealing elements 44 are so close apart that the compressed air losses are negligible. Subsequently, compressed air is introduced into the swiveled-up air chambers 38 and the roller weight loaded in the guide heads 5 is relieved in the manner described in the embodiments according to FIGS. 1 to 4. The pressure in the air chambers 38 is preferably controlled along a predetermined function as a function of the diameter of the winding rollers 3. The piston-cylinder units 40 in the embodiment according to FIG. 6 are pressurized so that the restoring forces from the pressure in the air chambers 38 are compensated for, ie a constant gap between the winding rollers 3 and the lateral sealing elements 44 is maintained.

FIG. 8 shows an embodiment in which the air box 36 is height-adjustable on its underside and is pivotable about an axis 47 parallel to the winding roller axis. The transverse walls parallel to the winding roller axis carry freely rotatable, freely rotatable rollers 48, 49 on their upper side, which can be placed on the winding rollers 3. When placed on the winding roller 3, the rollers 48, 49 simultaneously determine the sealing position of the sealing strips 44 extending in the web running direction. Due to the pivotable and height-adjustable mounting of the air box 36, this can be positioned adapted to the respective winding roll diameter.

The contact-free sealing elements 25, 27, 29, 30, 35, 42, 44 can have grooves extending transversely to the direction of flow of compressed air flowing out to act as a labyrinth seal to reinforce the sealing effect. Alternatively or as a supplement, sealing air can be used to reduce the losses caused by the narrow gap between the winding rollers 3 and the sealing elements. The compressed air required to build up excess pressure is advantageously fed in such a way that it also acts as sealing air at the possible outlet gaps.

Claims

PATENT CLAIMS

1.

Method for winding up a paper or sheet divided by longitudinal cutting

Cardboard web (1) on winding tubes, in which each winding roll (3) is wrapped in two on both sides

Winding sleeve is held by retracted guide heads (5), which at least partially carry the roll weight, characterized in that the winding rolls (3) when

Winding up at the latest from a winding roll diameter of 1000 mm below its center of gravity is supported in such a way that the two guide heads

(5) loaded roll weight does not exceed a value of 15,000 N per meter of roll width.

2.

Method according to claim 1, characterized in that sealing elements (25, 27, 29, 30, 35, 42, 44, 45, 48, 49) are moved to the underside of the winding rolls (3), which are below the center of gravity

Winding roller (3) form a pressure chamber in which support is provided

Compressed air creates excess pressure.

3.

Method according to claim 1 or 2, characterized gekennzeich¬ net that the winding rolls (3) when winding on a roll weight partially supporting support roller (3) and that the size that relieves the weight is used as a manipulated variable to control or regulate the winding process.

4.

Winding machine for winding a paper or cardboard web (1).

Wrap sleeves

- with a longitudinal cutting device (1) for dividing the web (1) into individual webs, and

- with individual winding stations, each consisting of two support elements (winding blocks 7) which can be moved transversely to the web running direction, to which a rotatable guide head (5) which can be inserted into the winding tube is attached, characterized by sealing elements (25, 27) arranged below a winding roll (3), 29, 30, 35, 42, 44, 45), which form a pressure chamber below the center of gravity of the roll, the top of which is closed off from the underside of the winding roll (3) and can be adapted to different roll widths and positions, and by means of generating a Overpressure in the pressure room.

5.

Winding machine according to claim 4, characterized in that the winding stations are arranged on both sides of a roller (support roller 4) against which the winding rolls (3) rest circumferentially when winding, and that a pressure chamber is formed by the following sealing elements for each winding station:

1. A downward sealing sealing plate (25) arranged below the winding roll (3), the width of which across the web (1) is greater than the maximum width of a winding roll (3) and which is approximately from the roller (support roller 4). extends radially to over the lowest point of a winding roll (3) with maximum diameter, 2. two side sealing elements (29, 30, 33), which can be moved transversely to the web (1) against the end faces of the winding roll (3) on the end faces of each winding roll (3) from the winding roll (3), the roller (support roller 4) and the lower sealing plate (25) to seal the limited opening, and

3. an outer sealing element (27, 35) with a width greater than the maximum winding roll width, which can be moved in the direction of the roll (support roll 4) against the winding roll (3) from the outer surface of the winding roll (3) and that of the support roll (4 ) opposite ends of the side sealing elements (29, 30, 33) and the lower sealing plate (25) seals the limited opening.

6.

Winding machine according to claim 5, characterized in that the lower sealing plate (25) extends over the entire working width as a common sealing plate for all winding stations on one side of the support roller (4).

7.

Winding machine according to claim 6, characterized in that a part (24.1) of the roll receiving platform of a roll lowering device (24) which can be raised and lowered next to the support roll (4) is also designed as a sealing plate (25).

8th.

Winding machine according to claim 7, characterized in that the outer sealing element (27, 35) is fastened so that it can move in the direction of the support roller (4) on the end of the receiving platform facing away from the support roller (4).

9.

Winding machine according to claim 7 or 8, characterized gekenn¬ characterized in that in order to form a receiving trough, the outer part (24.1) of the receiving platform facing away from the support roller (4) is connected to the receiving platform in a height-adjustable manner relative to the other part (24).

10.

Winding machine according to one of claims 5 to 9, characterized in that the side sealing elements (29, 30) are attached to the movable support elements (winding stands 7).

11.

Winding machine according to claim 10, characterized in that the guide heads (5) are mounted on the support elements (winding stands 7) in carriages (6) which can be moved radially to the support roller (4), and that the side sealing elements (29, 30) are made from the Range of movement of the carriage (6) is movably attached to the support elements (winding stands 7).

12.

Winding machine according to one of claims 5 to 9, characterized in that the lateral sealing elements (33) are mounted on a lateral cross member (16) of the winding machine in a transversely adjustable manner and can be pivoted against the support roller (4).

13.

Winding machine according to claim 12, characterized in that the side sealing elements (33) are pivotally attached to the carriage (18), on which pressure rollers (22) are also mounted for pivoting onto the winding rollers (3).

14.

Winding machine according to one of claims 5 to 13, characterized in that the compressed air is supplied into the pressure chamber via the side sealing elements (29, 30, 33).

15.

Winding machine according to claim 4, characterized in that an air box (36) which is at least partially open at the top and has a compressed air supply (39) is arranged below a winding roll (3), the open surface of the top (pressure surface 37) being friction-free the underside of the winding roll (3) is limited by sealing elements (42, 44, 45) and different roll widths and positions can be adjusted.

16.

Winding machine according to claim 15, characterized in that each winding station is assigned at least one air box (36) which can be adjusted transversely to the web (1).

17.

Winding machine according to claim 15, characterized in that the winding stations are arranged along two winding lines, and each side of the winding line is assigned a continuous air box (36), which is divided into individual air chambers (38) which can be separately supplied with compressed air.

18.

Winding machine according to claim 17, characterized in that the individual air chambers (38) are sealed against one another with bulkhead-like separating plates (42) which are mounted so as to be displaceable within the air box (36) transversely to the web (1).

19.

Winding machine according to one of claims 15 to 18, characterized in that the sealing elements (44) extending in the web running direction are curved in an approximately circular arc shape, adapted to the circumference of a winding roll (33).

20.

Winding machine according to claim 19, characterized in that the sealing elements (44) are elastically deformable and by means which adapt their curvature to the changing curvature of a winding roll (33).

21.

Winding machine according to one of claims 15 to 20, characterized in that the air box (36) or the air chambers (38) is mounted on one side so that it can be swiveled up about an axis (41) parallel to the winding roll axis and that on the opposite side there is an external sealing element Pivot axis (41) parallel, freely rotatable roller (45) is attached to the top of the transverse wall of the air box (36) or the air chamber (38).

22.

Winding machine according to one of claims 15 to 20, characterized in that the air box (36) is height-adjustable on its underside and is pivotally mounted about an axis (47) parallel to the winding roll axis and that its transverse walls, which are parallel to the winding roll axis, are attached on their upper side to the winding roll(s). ) (3) carry attachable, freely rotatable rollers (48, 49).

23.

Winding machine according to one of claims 15 to 22, characterized in that the winding stations are arranged on both sides of a driven support roller (4) and that at least one air box (36) is installed in a roller lowering device (24) which can be raised and lowered next to the support roller (4). is.

24.

Winding machine according to claim 22 or 23, characterized gekenn¬ characterized in that in the roll lowering device (24) a plurality of air chambers (38) are mounted side by side and independently of one another.