EP0769465A2 - King roll winding machine - Google Patents

Abstract

The web of material winds round the first of two king rolls (1,2) from the bottom. A stationary blast box (6) is positioned on the side of the king rolls facing the reels' bed and has a compressed air connection (6). Each of the two walls of the blast box is sealed by sealing elements against the outer surface of one of the two king rolls. A separating element is brought into operating position between the second king roll's (2) outer surface and the support part of the blast box.

Description

The invention relates to a winding machine for winding a running paper web. Reference is made to the preamble of claim 1.

When winding webs, the winding hardness plays a role for the subsequent processing. With paper webs in particular, it is very important that the winding hardness has a certain course over the entire roll diameter. In general, the winding hardness should drop from a certain initial value to an end value. The waste should be as even as possible from the first to the last layer. It should have a certain gradient, i.e. not too strong and not too weak. The course of the winding hardness should under no circumstances have jump points, e.g. a sudden drop.

This can only be achieved by taking certain measures. If you do nothing, the line pressure between the roller and the support roller or the support rollers increases with increasing roller diameter, and with it the winding hardness.

To avoid this, apply to compressed air in machines according to the preamble of claim 1, which enters through the compressed air connection into the pressure-tight chamber under the paper roll. Air volume or air pressure can be controlled according to the growing weight of the reel. It is also possible to extend the chamber along its length - i.e. across the web width - to be sectioned into individual chambers and each of these individual chambers to be provided with a pressure connection. In this way, the deflection of the winding can also be compensated for.

Furthermore, so-called rider rolls are used, which are arranged parallel to the supporting rolls. With these rider rolls are exerted on the roll by a contact pressure. The contact pressure is controlled, whereby it becomes large at the beginning and decreases with increasing roll weight.

The rider roller thus allows the line pressure and thus also the winding hardness to be influenced and controlled in the desired sense. However, if one wishes to produce a roll of very large diameter, the line pressure in the final phase of the winding is also very large. Likewise, the winding tension increases, so that the web can tear or crepe folds.

Other measures for influencing the winding hardness are to distribute the load of the roll to the individual support rollers. For this purpose, support rollers of the same diameter have already been arranged in different horizontal planes or support rollers of different diameters have been used. Furthermore, it is known that when winding on a support roller of smaller diameter, a harder winding is obtained than when winding on a support roller of larger diameter.

From DE-DM 7 310 606 a winding machine has become known which has two supporting rollers of the same size. One of these carrier rollers can be lowered during the winding process from an upper position above the horizontal plane of the axis of the other carrier roller at the beginning of the winding process. This lowering is intended to maintain a core that is firmly wound from the start.

US-PS 2 461 387 describes a winding machine which has two driven carrier rollers of different diameters; the carrier roller with the smaller diameter is provided with a coating with a higher coefficient of friction and driven at a higher speed than the other carrier roller. As a result, tensile stress is exerted on the outer layer of the web.

DE-OS 27 57 247 relates to a winding machine with support rollers of the same diameter. The winding hardness is controlled by changing the distance between the carrier rollers.

DE-PS 678 585 describes a winding machine with two support rollers, the first of which has a hard jacket and the second has a soft jacket. The axes of the two rollers are in the same horizontal plane.

DE 38 39 244 describes a winding machine with three support rollers. The first support roller is stationary, while the two subsequent support rollers are movable and are wrapped in a support belt. The winding hardness should be controlled over the roll diameter by means of the support belt and by changing the positions of the second and third support rollers. The support band should cause the largest possible support surface in order to lower the surface load. This winding machine is extremely complex. It also has a particularly serious disadvantage: as soon as the paper roll has grown so that it is mainly carried by the support band, the support band can swing violently, so that the paper roll starts to "dance" and can be catapulted out of bed .

It has also been proposed to produce the shells of these two rollers from rubber in a winding machine with two support rollers. The carrier rollers had the same diameter and the jackets had the same rubber hardness. However, this also causes the paper roll to swing and float.

EP 0 157 062 B1 describes a winding machine with two support rollers and a rider roller. The outer surfaces of all these rollers are made from a variety of formed individual fluid chambers, which are arranged axially next to one another, and which form the entire lateral surface of the roller in question with the formation of a joint with their individual lateral surfaces. The support behavior of such a roller is naturally non-uniform due to the large number of impacts across the web width.

The invention is based on EP 91914763. This document therefore shows and describes a winding machine according to the preamble of claim 1. According to claim 1 of this document, the blow box can be removed from its working position by pivoting or moving. The separating device can be moved into its own working position after removing the blow box.

A disadvantage of this embodiment consists in the following: The blow box has a very considerable construction volume and a correspondingly high weight. One has to imagine that it extends over the entire length of the changing bed, which can measure several meters, and that its weight is many hundreds of kilograms. This requires a complex movement mechanism with an appropriate drive. In addition, the process or pivoting of the blow box takes up a very considerable amount of space, which is often not available.

The invention has for its object to provide a winding machine according to the preamble of claim 1, in which the blow box is stationary, so that no complex movement mechanism with associated drive is required, and also a smaller space is sufficient for the entire machine.

This object is solved by the characterizing features of claim 1.

The inventor has thus proposed a simple solution. The blow box is and remains stationary, at least after the first assembly of the machine. Only a comparatively small part of the blow box is made movable or movable, namely those wall parts which carry the sealing element in question against the supporting roller in question. At the same time, the separating device is designed and arranged in such a way that it can be retracted in its working position between the second support roller (which is not wrapped in the web of material) and the relevant pivoted or moved away wall part with the associated sealing element in order to separate the web, namely each time when a web roll is completely wound.

Sometimes it may suffice to make only that wall part of the blow box with the associated sealing element movable or pivotable, which is assigned to the second support roller. In general, however, this will also be provided for the other wall part which is assigned to the first support roller.

The invention is explained with reference to the drawings.

Figure 1 shows a winding machine with two support rollers 1, 2, which together form a winding bed for receiving a paper roll 3. The paper roll 3 is created by winding up a paper web 4. As can be seen, the paper web 4 is brought in from the bottom left and first wraps around the support roller 1. The paper roll 3 is loaded in a controllable manner by a loading or rider roller 5, in order to also reduce the print run to influence.

As can also be seen, there is a blow box 6 between the two support rollers. This is only indicated schematically here. One can also see sealing elements 7, 8, which provide a seal between the walls in question Blow box 6 and the respective support roller 1 or 2.

FIG. 2 shows, in an enlarged representation, the crucial parts of the object of FIG. 1. From this one can again see the two rollers 1, 2, the paper roll 3 indicated by dash-dotted lines, the paper web 4 brought in from the left, and the blow box 6.

A separating device 9 can be seen as a further important element. This has a cutting edge 9.1 at its left end. The separating device 9 can be pivoted about a pivot center, which in the present case can be pivoted about the axis 2.1 of the roller 2. The pivot center could also be slightly offset from axis 2.1. As can be seen, the separating device 9 has an essentially circular arc shape.

The details of the blow box can be seen more precisely from FIG. 3. The blow box 6 and the two seals 7, 8 can be seen there. The seal 7 is carried by a component 6.1 and the seal 8 by a component 6.2. The two components 6.1 and 6.2 are parts of the support box 6. They are both essentially U-shaped in this side view in order to increase the rigidity. However, this is not absolutely necessary. The two components 6.1 and 6.2 are components of the blow box 6. They will be referred to below as "supporting parts".

Support part 6.1 is displaceable, namely against the support roller 2. Note the position of the support part 6.1 shown in dashed lines. Support part 6.2, however, is pivotally mounted on the main part of the support box 6 - see pivot axis 6.3. Support part 6.2 can be shown in dash-dotted lines Position swiveled and is thus inside the main part of the blow box 6th

A guide device 10 is provided for moving the support part 6.1. This comprises a guide pin which is hairpin-shaped in cross section. This extends over the entire width of the two support rollers 1, 2. It also includes guide rollers which can run in the guide bush 10.1 and which engage the support part 6.1 via connecting levers (not shown here). The lower leg of the guide bush 10.1 has a bent end 10.2. This serves to raise the support part 6.1 slightly in the end region of its stroke.

As can be seen, the support part 6.1 consists exclusively of the U-shaped structure. The wall 6.4 located under this support part 6.1 is permanently stationary. A seal 6.5 is provided between the U-shaped support part 6.1 and the wall 6.4 below.

The support member 6 includes not only the U-shaped structure, but also a console 6.6. The console 6.6 is articulated via the pivot axis 6.3 to an underlying, fixed wall 6.7 of the supporting box 6.

If the winding machine is put into operation, a start of the web of the paper web 4 - seen in the drawing on the left - is brought up and guided around the support roller 1. In order to be able to carry out this insertion effortlessly (for example with the aid of air nozzles), support part 6.1 is moved into the dot-dash position. If the beginning of the paper web is wound around a winding tube (not shown), the supporting part 6.1 is again moved into the working position shown in solid lines. Sealing element 7, which is generally a labyrinth seal is, the outer surface of the support roller 1 is directly opposite.

After a paper roll 3 has been finished, the machine is stopped. Support part 6.2 is pivoted into its position shown in broken lines. The separating device 9 is pivoted in the direction of the winding bed until it assumes the position shown in broken lines, in which it cuts the paper web. The paper roll is rolled (simultaneously or subsequently) over the support roller 2 in the direction to the right and thus ejected from the winding bed.

The device has another, very advantageous device. A wall 11 can be seen in FIG. 3. This connects the fixed wall 6.4 to the fixed wall 6.7 of the blow box. It also extends over the entire length of the blow box. In the present case, it is perforated through a large number of holes. In this case, the bores are distributed absolutely uniformly over the surface of the connecting wall 11.

The connecting wall 11 has to perform the following functions in the present case:

On the one hand, it serves to stiffen the blow box 6.

Secondly, it serves to evenly distribute the compressed air that is fed to the blow box 6 on one or both ends (see feed line 6.8) over the cross section of the blow box 6.

A third, very important function is as follows: In the case of carrier roll winding machines, the paper web is torn off from time to time. In this case, the paper web falls into the blow box; this waste paper must be removed as soon as possible. The connecting wall 11 serves in this case collecting such paper waste. If the paper waste lies on the connecting wall 11, it can be removed much more easily through one of the two end faces of the blow box 6 than if it were lying on the bottom of the blow box 6. The removal of the paper waste could also be automated, for example by means of a scratch or a rotating conveyor belt.

According to a further idea, said perforation of the connecting wall could be distributed according to a certain pattern. It would be conceivable that the size or the number of bores in the connecting wall decrease towards the end regions. This could be useful because the paper roll bends particularly strongly in the middle area.

Finally, a blind could also be assigned to the connecting wall 11, with which it is possible to arbitrarily change the throughput of the individual compressed air flows which pass through the bores of the connecting wall 11.

Another embodiment of the invention is shown in FIG. Here again the blow box 6 and the two seals 7, 8 can be seen. In the present embodiment, the supporting part 6.1 can now be pivoted - see pivot axis 6.3. Note the position of the support part 6.1 shown in dashed lines. Supporting part 6.2, on the other hand, is slidably attached to the support box, specifically in the vertical direction. Support part 6.2 can be moved along the arrow. This has the advantage that when the carrier drum 2 reaches the dot-dash position - for example, it has to be pivoted away because the paper web breaks and the carrier drum is packed - the sealing element 8 is automatically moved downward with the carrier drum 2.

Furthermore, the blow box 6 according to FIG. 4 has stiffening ribs 14 which connect the fixed wall 6.4 to the fixed wall 6.7 of the blow box. Around the air supply line 6.8 of the blow box, sheets 15 are attached, with which the air supply line is fastened in the blow box.

Like the blow box according to FIG. 3, a connecting wall 11 is also provided in the embodiment shown, which is perforated and serves to catch the paper residues when the paper web is torn off.

The connecting wall 11 is arranged inclined between the fixed walls 6.4 and 6.7 in such a way that the paper residues slide downwards in the blow box and collect in front of the opening 16 embedded in the fixed wall 6.4. The paper residues can then be easily removed after opening the flap 17 arranged in front of the opening 16.

Claims (10)

Carrier roll winding machine for winding webs, especially paper webs 1.1 with two support rollers (1, 2) which form a winding bed for receiving a roll (3) to be formed from the material web (4); 1.2 one of the two support rollers (1, 2) is wrapped in the web of material entering from below ("first support roller"); 1.3 with a blow box (6) which is arranged on the side of the support rollers (1, 2) opposite the winding bed and has a compressed air connection (6.8); 1.4 the blow box (6) has two walls, each of which can be sealed by sealing elements (7, 8) against the outer surface of one of the two support rollers (1, 2); 1.5 a separating device (9) is provided which can be moved into a working position when a web roll (3) is finished; characterized by the following features: 1.6 the blow box (6) is stationary; 1.7 those wall areas (6.1, 6.2) of the blow box (6) which directly support the sealing elements (7, 8) ("supporting parts") can be disengaged from the sealing positions together with the sealing elements (7, 8); 1.8 the separating device (9) can be brought into its working position between the outer surface of the second support roller (2) and the associated support part (6.2) of the blow box. Carrier roller winding machine according to claim 1, characterized in that the carrier parts (6.1,6.2) together with the seals (7,8) can be pivoted about axes which run parallel to the carrier rollers (1,2). Carrier roll winding machine according to claim 1, characterized in that the carrier parts (6.1, 6.2) with the sealing elements (7, 8) are displaceable. Carrier roller winding machine according to one of claims 1 to 3, characterized in that the carrier part (6.1) assigned to the first carrier roller (1) is displaceable, and the carrier part (6.2) assigned to the second carrier roller (2) is pivotable. Carrier roller winding machine according to one of claims 1 to 3, characterized in that the first carrier part (6.1) assigned to the carrier roller (1) can be pivoted and the carrier part (6.2) assigned to the second carrier roller (2) is displaceable. Carrier roll winding machine according to one of claims 1 to 5, characterized in that a connecting wall (11) is provided between the fixed wall parts (6.4, 6, 7). Carrier roll winding machine according to claim 6, characterized in that the connecting wall (11) is fixed to the fixed wall parts (6.4, 6.7). Carrier roll winding machine according to claim 6 or 7, characterized in that at least one of the fixed wall parts (6.4, 6.7) has a closable opening (16). Carrier roll winding machine according to Claim 8, characterized in that the connecting wall (11) between the fixed wall parts (6.4, 6.7) is arranged at an incline such that paper residues collected thereon slide independently to the opening (16) embedded in the fixed wall part. Carrier roll winding machine according to one of claims 6-9, characterized in that the connecting wall has perforations and is arranged above the compressed air connections (6.8) on the blow box (6).

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