EP0916603A1 - Winding machine and method, especially for a slitter - Google Patents

Abstract

The apparatus winds or unwinds a material web onto or from a winding reel, around whose periphery a protective fitting is arranged. The protective fitting (11) comprises a number of rollers whose rotary axes are parallel to the winding axis. The rollers are flexibly coupled together at right angles to their rotary axes. An Independent claim is included for a method of winding using the above apparatus.

Description

The invention relates to a winding device, in particular for a slitter rewinder, for winding and unwinding a material web to or from a winding roll with a support device that can be placed on the circumference of the winding roll.

The invention is intended to be folded using a paper web can be described as an example of a material web. But it can also be used with other material webs. The invention is explained using the example of winding. The unwinding takes place accordingly.

In one of the last manufacturing steps, the paper web, if necessary after passing through a slitter, wound up into winding rolls. As The starting point of the winding roll is often a winding core or a cardboard winding tube. This winding tube shows especially with wider winding rolls insufficient rigidity, so that the winding roll with increasing diameter and thus increasing Weight in the middle starts to sag or sag, if it is only on the roll core when winding, i.e. is held at the center of the winding roll. One is therefore more or less forced to do one Such winding technology, the winding roll on the circumference to assist to reduce deflection or to avoid, as was recognized in EP 0 289 776 B1. The main focus is on unwinding. The problem of supporting the role with great Weight is the same there.

As the diameter of the winding roll increases, how said above, their weight too. Accordingly increased the weight increases with increasing diameter, with the winding roll on the support device rests, and thus the contact pressure. This However, contact pressure is one of the factors affecting the winding hardness determine. The bigger it is, the bigger it is the winding hardness. However, this phenomenon is undesirable. Rather, you want the opposite winding hardness curve reach over the diameter of the roll, i.e. the role should be harder in the area of the roll core be wrapped around the circumference.

There are several others to solve this problem Approaches known. So DE 42 14 713 A1 shows the use of a belt that runs over three support rollers is arranged in a triangle, the base of which points upwards in the direction of gravity. Between The two upper support rollers are located accordingly a free length of the tape on which the winding roll lies on. If you adjust the tension of the tape accordingly influenced, then the tape lies in a partial area Circumference of the winding roll. The weight distributed accordingly on a slightly larger area, so that the contact pressure is lower.

With such a solution, however, it is relative difficult to achieve reproducible results over the long term, because with such a load Band changed over time. The compensation of this Changes are possible, but complex.

Another solution results from EP 0 292 451 B1. Here, the winding roll is on the one hand on a pressure roller on. On the other hand, is next to the pressure roller another pair of rollers arranged, also by one Band is wrapped. With increasing diameter of the The winding roll moves the center of the winding roll increasingly over the pair of rollers towards the belt, so that here too a better weight distribution should be possible. Ultimately, however, there is also here the danger that the winding roll with a large part of their Weight on one of the two rollers of the pair of rollers rests and the winding hardness is inadmissibly high becomes.

The invention has for its object the influence the weight to the quality of the winding roll reduce.

This task is the beginning of a winding device mentioned type solved in that the support device has a plurality of rotatable rolling elements, whose axes of rotation are essentially parallel to Winding axis run and the transverse to the axes of rotation are articulated together.

A "roller carpet" is therefore used as the support device. This roller carpet represents a variety of Support points for the winding roll are available. There the rolling elements are articulated along the circumferential direction are interconnected, it is possible to support points the diameter of the winding roll, which is at Winding changes, continuously adapting. Accordingly distributes the weight of the winding roll over the many support points, i.e. on the many rolling elements, so that in every single nip (between winding roll and Rolling elements) a correspondingly reduced surface pressure arises, which allows the influence of weight to reduce and uncontrolled changes in winding hardness to avoid. Because the individual Rollers relatively closely adjacent in the circumferential direction can only be short free path lengths, that don't bother anymore. One can with the support device rather, relatively good for a clearly defined support force to care.

The support device preferably has at least one one end essentially in the circumferential direction the tensioning device acting in the direction of gravity on. The tensioning device ensures that the support device with the necessary tension against the Scope of the winding roll is held to the weight to record. With the tensioning device you can cause the desired part of the circumference of the winding roll accordingly with the support device becomes.

For this purpose, the tensioning device preferably has one Lifting device that hinges to a base is. The lifting device initially has the advantage that it can act against the direction of gravity.

The winding roll is raised, so to speak. By the articulated supports of the lifting device, for example be designed as a hydraulic lifting cylinder can, it is possible that the support device adjust the changing diameter of the winding roll can. The end at which the jig is placed is then not only in the vertical direction, but can also be moved in the horizontal direction.

Both ends are preferably with a tensioning device Mistake. This allows the tensioning device to adapt even better to the circumference of the winding roll.

The necessary tension of the "roller carpet" can also are generated by a clamping device, which also in horizontal direction. The corresponding tension elements, e.g. hydraulic cylinders, can be articulated here be suspended to grow due to bending moments Avoid roll diameter. The middle (and adjacent areas) of the roller carpet change their vertical position with the diameter of the roll stronger than the ends. The roller dives with a larger diameter automatically deeper into the support device, so that the number of contact surfaces practically automatically adapts to the roll diameter of the winding roll. One can use horizontal and vertical clamping devices also combine.

This clamping device can either have two stands spread to which the ends of the support device are attached or pulls the two ends of the support apart.

In one configuration, the rolling elements can be designed as continuous roles should be formed. this is a technically very easy to implement, where the roles are practically the whole extend the axial length of the support device.

The rolling elements are preferably designed as wheels, wherein several wheels have a common axis of rotation and a distance between individual wheels in the axial direction remains. With this configuration, one divides the continuous rolls on in several axial sections. The axis of rotation can, but does not have to, as a continuous one constructive part be provided. It is enough if the centers of several wheels on one imaginary straight lines around which the wheels turn. The term "wheels" is used here as a distinction the continuous "roles" used. The wheels too can have a larger axial extension than the diameter exhibit. But you don't have to. Preferably the wheels have a diameter in the range of 100 up to 300 mm and an axial extent in the range of 25 up to 100 mm.

Training with the wheels has a special advantage. This is because there can be a connection between axes of rotation at least one distance apart. So that will a higher rigidity of the support device in the axial direction achieved. The danger that the support device sagging in the axial direction then becomes smaller.

In a particularly preferred embodiment, that the wheels of adjacent axes of rotation in the axial direction are arranged offset from one another, the Wheels of an axis of rotation in the distances between the wheels of the neighboring axis of rotation. With this configuration an even denser sequence of Support or support points for the winding roll in the circumferential direction. This distance is without this measure in the range of the diameter of a wheel. With this Measure you can reduce the distance to about half, so that you can match the diameter of the wheels can choose great. But have larger diameters a more favorable impact on the local contact pressure.

The wheels are preferably attached to carrier strips, which are arranged articulated one behind the other in the circumferential direction are. The axes of rotation form at the same time the articulated connections between the carrier strips. The Carrier strips lead to a relatively high degree of rigidity in the axial direction.

Preferably, each wheel is on both axial sides supported. This increases the resilience.

The rolling elements are preferably in the circumferential direction the winding roll together by an elastic support connected. Then when the ends of the Support device for changing the diameter of the Do not follow the winding roll or do not follow it sufficiently, one greater tension with larger roller diameter and thus a greater load capacity.

At least one rolling element advantageously has a fan arrangement on. The rolling elements rotate during operation, where the peripheral speed of the rolling body at least approximately equal to the peripheral speed of the Winding roll is. If you now the rolling body with a Fan arrangement provides, for example with baffles, which act like a fan, then can you use the resulting air flow for cooling. With the inevitable flexing work when winding namely, heat is generated, which in this way with little Additional effort can be discharged elegantly.

It is also advantageous if at least one rolling element is driven. There are several advantages to this. On the one hand, you can use this drive to drive relieve the winding roll. One can, for example bring a drive power that is sufficient to to rotate the rolling elements. On the other hand you can choose the appropriate one Rollers also with a different peripheral speed than drive the winding roller so that you can influence the winding hardness in this way can.

The support device preferably has an elastic one Surface on. The points of contact between the winding roll and the rolling elements are widened, which in turn leads to a lower surface pressure leads. The surface of the winding roll is protected.

This can preferably be achieved in that the rolling elements have an elastic surface. The winding roll is on the one hand on many elastic Support points on what increases the contact area. On the other hand, an almost frictionless move on the support device is still guaranteed.

For this purpose it can be provided that the rolling element under their surface filled with air or foam Have chambers. This is particularly advantageous if wheels are used as rolling elements. As Then you can use conventional rubber tires that are inflated. Then these are elastic enough to enable the winding roll to be applied gently, which results in the desired low surface pressure Has. In some cases it will be enough if the load-bearing capacity solely through the rigidity of rubber wheels is achieved.

The support device advantageously engages symmetrically on the winding roll. This leads to a good one controllable power distribution. Especially with growing You don't have to take any measures, around those applied by the support Forces that do not only act in the direction of gravity compensate.

The invention also relates to a winding process for Winding or unwinding a material web to or from a Winding roll, in which the winding roll with stationary Axis rotated and at least above a predetermined Roll diameter supported on the circumference from below becomes.

To solve the above problem, support is required a band-like or chain-like support device stretched horizontally, the ends of the Support device at a vertical speed are moved less than the change in diameter the winding roll is.

This will be described using the example of winding. From a certain diameter the winding roll has a weight that requires support. No later than from this point on it is necessary that the Support device supports the circumference of the winding roll. The support device is tensioned for support. With increasing The diameter of the winding roll decreases Wind the reel deeper and deeper into the support device. This is caused by the ends of the support device be lowered more slowly than the winding roll grows. This has two effects: Firstly the vertical support force is increased because the horizontal Tension through the vertical indentation of the Winding roll rises. On the other hand, the curvature approaches the support device automatically the radius of the Winding roll. There is an automatic adjustment the support surface of the support device on the peripheral surface the winding roll. The support of the winding roll So grows dynamically, so to speak (or takes dynamically when the winding roll is unwound). It is achieved that the contact pressure that the support device exerts on the winding reel, despite the stationary Always store the axis of the winding roll in remains at an acceptable level. Of course you can provide for the ends of the support to be lowered when you have an excessive tension want to avoid the support device. Because the lowering but the ends are slower than the growth of the diameter of the winding roll remains the desired one Sustained tension and even increases.

It is particularly preferred that the ends of the Support device below the predetermined diameter the winding roll held in a vertical position become. As long as the diameter of the winding roll has not yet been reached, the support device do not take action. As soon as this diameter is reached, you can use the support device to the system bring to the winding roll.

The predetermined diameter of the winding roll depends essentially width, but generally is 800 mm or less. Experience has shown that with a radius of 400 mm the roll weight so what is high is that support is needed.

Preferably, the ends of the support device in held stationary at a height equal to the height at which the axis of the winding roll is 45% of the predetermined Diameter is removed. One carries here the fact that the support device is somewhat slack even if it is stretched horizontally. Man for this reason arranges the ends of the support device (With "ends" are always those in the circumferential direction the winding roll is meant) slightly higher, so that the winding roll when reaching the predetermined Diameter practically automatically on the support device meets. The support device is here designed as a "roller carpet", which described above has been.

Fig. 1

eine schematische Seitenansicht einer ersten Ausgestaltung einer Wickeleinrichtung,

Fig. 2

eine Seitenansicht auf die erste Ausgestaltung der Stützeinrichtung,

Fig. 3

eine Draufsicht der Wickelrolle mit Stützeinrichtung nach Fig. 2,

Fig. 4

eine Draufsicht auf eine weitere Ausgestaltung einer Stützeinrichtung,

Fig. 5

eine zweite Ausgestaltung einer Wickeleinrichtung und

Fig. 6

eine dritte Ausgestaltung einer Wickeleinrichtung.

The invention is described below on the basis of preferred exemplary embodiments in conjunction with the drawing. Show here:

Fig. 1

2 shows a schematic side view of a first embodiment of a winding device,

Fig. 2

a side view of the first embodiment of the support device,

Fig. 3

3 shows a plan view of the winding roll with the support device according to FIG. 2,

Fig. 4

a plan view of a further embodiment of a support device,

Fig. 5

a second embodiment of a winding device and

Fig. 6

a third embodiment of a winding device.

A winding device shown schematically in FIG. 1 100 has two winding stations 1, 1 ', in which Partial webs 5 ', 5' 'of a material web 5 to partial web rolls 6 can be wound up. For the sake of clarity is the partial web roll 6 in the left winding station 1 at a relatively late stage in the winding process shown, i.e. it has almost its final diameter reached. In contrast, in the right winding station 1 ' the beginning of a winding process is shown. The partial web rolls 6 are held axially in clamping heads and wound on winding tubes 4. Especially with larger ones Roll widths (= axial length of the winding roll 6) this leads to the risk of sagging of the winding roll 6 in the axial center, which in turn becomes uneven and thus undesirable winding results leads.

For winding the partial webs 5 ', 5' 'by a Nip 8 between a pressure roller 9 and the winding roll 6 led. The pressure roller 9 is using a Slide on a base 7, for example a machine frame, movable. With not shown, but measures known per se are achieved, that the pressure roller 9 has a certain contact pressure the winding roll 6 or the winding tube 4 at the beginning of Exercises to adjust the winding hardness.

To prevent the winding roll 6 from sagging a support device 11 is provided, which in Fig. 2 in Side view and shown in more detail in Fig. 3 in plan view 3, only one half of the support device shows.

At each end of the support 11 in the circumferential direction two plungers 15 are provided, which by a Carrier 22 are interconnected. As support elements several wheels 23 are provided. The wheels 23 are on Axes of rotation 24, 25 arranged with an axial distance to each other, each forming a gap 26. Here, the wheels 23 of adjacent axes of rotation 24, 25 offset from each other in the axial direction, so that the Wheels of an axis of rotation 25 in the gap 26 between the Wheels 23 of the other axis of rotation 24 can protrude. Hereby there is a relatively high packing density, i.e. the support points of the winding roll on the support device 11 are relatively dense in the circumferential direction together, which can be seen in Fig. 2. Here is the Support device 11 'in solid lines for one smaller diameter of the winding roll 6 and with dashed lines shown lines for a larger diameter the winding roll 6 shown.

The axes of rotation 24, 25 form hinge points for the connection of strips 20, which are in the manner of a circumferential direction extending chain are interconnected. These strips 20 are not only in the axial area Provided ends of the support device 11, but on both axial sides of each wheel 23, so that each wheel 23 is well supported and the other relatively high rigidity in the axial direction results. The axes of rotation 24, 25 can therefore be practical do not sag because they are also in their axial center get supported.

The axes of rotation are preferably kept non-rotatable, while the wheels 23 with the help of bearings 27 on the Rotational axis are rotatably mounted.

The wheels 23 can now have different designs exhibit. 3 shows three examples. The wheel 23A has air chambers 28, it can pumped up and put under pressure so that it shows an elastic behavior that one Car tire is approximated. 3 is the wheel 23B made entirely of plastic, which is a certain Has elasticity so that the circumference of the wheel 23B somewhat when the winding roller 6 is loaded can press in to widen the contact surface.

The wheel 23C has chambers filled with a plastic 29 on so that it is also a predictable Stiffness maintains.

It is understood that if possible all the wheels of the support device 11 should have the same structure in order to allow a uniform loading of the winding roll 6.

If the wheels 23, if only to a small extent, compressible are then created by the ongoing A certain warmth. To apply this heat can at least some bikes with ventilation devices 30 may be provided, for example a baffle arrangement on her hub 31, which in the manner of a Radial fan works. Since the wheels are in operation anyway you can take advantage of this rotation, to generate a flow of cooling air that dissipates the heat. Of course, all bikes with such Ventilation devices 30 may be equipped. The ventilation devices 30 can also on both axial Ends of the wheels 23 may be arranged. It is relatively good to recognize that an air flow generated in this way immediately on the peripheral surface of the adjacent wheel another axis of rotation is blown.

The support device 11 in FIG. 4 represents an alternative 3. It has a Row of rolling elements on, as over the axial length continuous support 13 of the support device are. A roller 13 'is driven here. All roles have a surface that has a certain Compressibility (not shown). It forms thus an elastic surface of the support device 11.

The individual rollers 13 are made of a strip 20 Band steel or a thick sheet metal joined together, the axes of rotation 21 of the rollers 13 simultaneously Form hinge points for the strips 20. The Strips 20 are thus articulated with one another in the circumferential direction connected.

The support device 11 can therefore in both embodiments around part of the circumference of the winding roll 6, as shown in FIG. 1 for the winding station 1 is shown. The strips can also be made from one stable elastic material.

Both ends 14 (in the circumferential direction) of the support device 11 are each with a plunger 15 of a lifting cylinder 16 connected. The lifting cylinders 16 are via articulation points 17 on a base 18, for example the Floor, supported. You may therefore tend to like a comparison of the winding stations 1 and 1 'shows.

With the help of the lifting cylinder 16, the two ends 14 the support 11 raised so that the Support device practically like a band on the circumference the winding roller 6 hugs. With increasing diameter the winding roller 6 migrates to the area where the Support device 11 is present, in the direction of gravity downward. Accordingly, the plunger 15 drive Lift cylinder 16 a.

This configuration ensures that a large number of points of contact between the support device 11 and the winding roller 6 is present. It lies here at hand that depending on the desired Application also much more than that in Fig. 4 shown six rollers 13, 13 'used can be. The number of contact points is too Start of the winding process smaller. One can accordingly with the same force, which if necessary over exerted a roller, not shown, from above can reach a higher contact pressure because the force is distributed over fewer nips. With increasing Roll diameter increases the number of nips, so the support points, and the contact pressure drops automatically.

Fig. 5 shows a modified embodiment in which Corresponding parts are provided with crossed reference numerals are.

5 is the support device 11 'also designed as a "roller carpet". The Roles are not for reasons of clarity drawn. Their course is indicated by the line. 5 is a modified form of Suspension of the support device 11 'can be specified. The base 18 'is no longer through the floor formed, but by two on both sides of the winding roll 6 'lying side walls, for example can be formed by a machine frame. Between the base 18 'is suspended from the support device 11', hydraulic cylinders 16 'at both ends are provided, which are hinged to the base 18 ' are. With the help of the cylinder 16 ', the support device 11 'more or less tense.

The winding roll 6 'is of two different diameters drawn. For the sake of clarity, too the arm itself is not shown. It can only be seen that the center the winding roll 6 'always remains at the same height. With increasing diameter (shown in dashed lines) the winding roll is increasingly immersed in the support device 11 'a. The automatically increases Contact surface. If you look at the length of the support 11 'keeps the same in the horizontal direction, then increases the tension and thus also the vertical restoring force, so that the winding roll 6 'is supported even better becomes.

The roller 6 'is shown with a solid line, when it has reached a diameter from which one Support from the support device 11 'is necessary is. It is exaggerated for clarity, that the support device (with the solid Line) has a horizontal course. In reality however, it is due to its own weight sag something. Accordingly, you arrange the ends, thus the inner pivot points of the cylinders 16 ', see above assumes that they are about 10% higher (based on the radius the winding roll 6 ') are shown as. This is exaggerated in Fig. 5, which is detailed below is discussed.

The winding roll then dips with increasing diameter 6 'deeper into the support device 11 and presses this down. The automatically increases Contact surface and the reaction force vertically upwards is increasing. The increase in strength can be done a little by controlling the cylinders 16 'somewhat extends, i.e. the tension decreased. This is very sensitive control of the tracking force possible.

The diameter of the winding roll 6 ', from which supports should be around 800 mm. Before is one Support is often not necessary.

A similar configuration is shown in Fig. 6, where corresponding parts with double-deleted reference numerals are provided. Here is the support device 11 '' hung on two stands 15 '', hydraulic cylinder 16 '' can be spread. Each the smaller the diameter of the winding roll 6 '', the continue to move the two stands 15 '' apart. With increasing diameter of the winding roller 6 '' approach however, the stands face each other.

In particular in the configurations according to FIG. 5 and 6, but also in the other configurations of the The individual rollers can be supported by a support device elastic band, an elastic carrier or other Construction elements made of elastic, i.e. springy acting, material to be connected. If immerses the winding roll deeper into the support device, then the tension increases.

Claims (23)

Winding device, in particular for a slitter rewinder, for winding or unwinding a material web to or from a winding roll with a support device which can be placed on the circumference of the winding roll, characterized in that the support device (11, 11 ', 11'') has a plurality of rotatable roll bodies ( 13, 13 '23), the axes of rotation (21, 24, 25) of which run essentially parallel to the winding axis and which are articulated to one another transversely to the axes of rotation (21, 24, 25). Winding device according to claim 1, characterized in that the support device (11, 11 ', 11' ') at least one end (14) in the circumferential direction an essentially counteracting gravity Has clamping device (15, 16). Winding device according to claim 2, characterized in that the clamping device (15, 16) a Has lifting device that is articulated on a base (18) is mounted. Winding device according to claim 2 or 3, characterized characterized in that both ends (14) with a Tensioning device (15, 16) are provided. Winding device according to one of claims 1 to 4, characterized in that the support device (11 ', 11' ') one that also acts horizontally on both ends Has tensioning device. Winding device according to one of claims 1 to 5, characterized in that the rolling elements (13, 13 ') are designed as continuous rollers. Winding device according to one of claims 1 to 6, characterized in that the rolling elements as wheels (23) are formed, wherein a plurality of wheels have common axis of rotation (24, 25) and a distance (26) between individual wheels in the axial direction remains. Winding device according to claim 7, characterized in that a connection (20) between axes of rotation (24, 25) at least at a distance (26) he follows. Winding device according to claim 7 or 8, characterized characterized in that the wheels (23) are adjacent Axes of rotation (24, 25) offset from one another in the axial direction are arranged, the wheels (23) one Axis of rotation (25) in the distances (26) between protrude the wheels of the adjacent axis of rotation (24). Winding device according to one of claims 7 to 9, characterized in that the wheels (23) on supporting strips (20) are attached in the circumferential direction are articulated one behind the other. Winding device according to claim 10, characterized in that each wheel (23) on both axial Sides is supported. Winding device according to one of claims 1 to 11, characterized in that the roller body (13, 23) in the circumferential direction by an elastic Carriers (11 ') are interconnected. Winding device according to one of claims 1 to 12, characterized in that at least one Roll body has a fan arrangement (30). Winding device according to one of claims 1 to 11, characterized in that at least one Roll body (13 ') is driven. Winding device according to one of claims 1 to 12, characterized in that the support device has an elastic surface. Winding device according to one of claims 1 to 15, characterized in that the rolling elements (13, 13 ', 233) have an elastic surface. Winding device according to one of claims 1 to 16, characterized in that the rolling elements (23) filled with air or foam under their surface Have chambers (28, 29). Winding device according to one of claims 1 to 17, characterized in that the support device (11, 11 ') acts symmetrically on the winding roll. Winding device according to one of claims 1 to 18, characterized in that a pressure roller (9), against which the winding roller (6) rests during winding, Areas (19) of reduced diameter has in which the axially limited Length support device (11) arranged between the winding roller (6) and the pressure roller (9) is. Winding process for winding or unwinding a material web to or from a winding roll in which the winding roll rotated with a stationary axis and at least above a predetermined roll diameter is supported from below on the circumference, thereby characterized in that a band or chain-like support device horizontal is tensioned, the ends of the support device moved vertically at a speed be less than the change in diameter the winding roll is. A method according to claim 20, characterized in that the ends of the support device below the predetermined diameter of the winding roll in one vertical position. A method according to claim 21, characterized in that the predetermined diameter of the winding roll is preferably 800 mm or less. A method according to claim 22, characterized in that the ends of the support device at a height be held stationary by the height at which the axis of the winding roll is 45% of the predetermined Diameter is removed.

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