EP1947042B1 - Winding apparatus - Google Patents

Description

The invention relates to a winding device for winding a continuously tapered material web on a winding shaft to form a coil of the material web on the winding shaft, wherein a rotatably mounted in the winding device contact roller is provided over which the wound material web feasible and from this to the winding shaft or the coil forming thereon can be delivered, wherein at least two stabilizing rollers are provided, which can be applied to the surface of the winding shaft or the coil forming thereon by means of a pivoting device on the side of the winding shaft opposite the contact roller and can be lifted from it by the pivoting device when not in use

Winding devices of the type mentioned are widely known and are used in particular for winding continuously tapered material webs made of plastics. Examples of such material webs include single- or multi-layered extruded plastic films, which are fed from an upstream extrusion line of the winding device, as well as nonwoven webs based on meltblown microfibers and / or continuous fibers or combinations of the aforementioned webs, including, for example DE 42 13 712 C2 is referenced.

Since the winding shafts held only in the region of their shaft ends in the winding device receive a considerable own weight when they are wound with a coil of the material web of possibly considerable diameter, these are inevitably subject to bending under their own weight, which in particular results in very slim winding shafts and a winding device with high power and correspondingly high speed of the winding shaft, that undesired bending vibrations occur. These bending vibrations cause quality problems during winding, since the winding shaft has a plurality of degrees of freedom and strongly deflects in their degrees of freedom when such vibrations occur. In this case, the contact roller easily loses contact with the coil forming on the winding shaft in the areas with high amplitude, so that in these areas the material web is wound up for a short time with a gap between the contact roller and the coil, with air between the individual layers of the material web Wrapped with, resulting in unusable, inhomogeneous and poor quality wound coils of material web entails.

It has therefore already been proposed to support the winding shaft in the central region having the greatest deflection, which however is technically complicated and, moreover, is only possible to a certain extent because there is generally only little space for support beneath the winding shaft and the forming coil Available.

It has also been proposed to store the winding shaft four times in the region of its shaft ends in order to reduce the deflection, for example on the DE 198 55 781 A1 is referenced. As a result, although a certain deflection reduction and, to that extent, an increase in the critical speed of a winding shaft can be achieved, there is still room for improvement.

A generic winding device is from the EP 1 757 546 A2 (State of the art according to Art. 54 (3) EPC.

The object underlying the invention is therefore to develop a winding device of the type mentioned in such a way that the deflection in the winding shaft and the associated occurrence of bending vibrations is prevented in the simplest possible way, with the inventive design preferably also for retrofitting to already should be suitable existing winding devices.

To solve this problem, the invention proposes the formation of a winding device according to the features of claim 1.

Advantageous embodiments and further developments of the winding device according to the invention are the subject of the dependent claims.

The invention provides to use at least two stabilizing rollers in the winding device according to the invention, which by means of a Anschwenkeinrichtung on the contact roller opposite side of the winding shaft to the surface of the winding shaft or the coil forming thereon can be applied and are lifted off when not in use by the Anschwenkeinrichtung of this ,

The on the side opposite the contact roller side of the winding shaft to the surface of the winding shaft or the coils forming thereon stabilizing rollers take in the friction drive in the region of a nine o'clock position on the contact roller usually adjacent winding shaft or the coils forming thereon in the State of the art hitherto unavoidable degrees of freedom and prevent the occurrence of bending vibrations with the initially described adverse effects.

In order to ensure an always uniform stabilization function of the stabilizing rollers and the concomitant suppression of bending vibrations, irrespective of the gradually increasing diameter of the coil forming on the winding shaft, it is provided that stabilizing rollers are applied to the surface of the winding shaft or of the coils forming thereon Center axis of a first stabilizing roller always above and the center axis of the second stabilizing roller always below the running through the central axis of the contact roller and the winding shaft horizontal plane, so that always creates a three-point support. In this way, the stabilizing rollers at each stage of the winding process on the winding shaft this take the degrees of freedom that is responsible for the occurrence of Quality fluctuations in the winding result have so far been responsible.

Since the stabilizing rollers by means of the Anschwenkeinrichtung can be applied to the surface of the winding shaft or the coil forming thereon and are lifted when not in use by means of the Anschwenkeinrichtung, the stabilizing rollers and their Anschwenkeinrichtung hinder the other operation and the movement within the winding device not which is particularly advantageous for the implementation of winding shaft change when reaching a predetermined coil diameter on the winding shaft.

Thus, the invention provides that the stabilizing rollers by means of the Anschwenkeinrichtung from a retracted from the winding shaft rest position in which they do not interfere with the movement within the winding device, are pivotable into a working position in which they on the surface of the winding shaft or the forming thereon Coils can be applied and vice versa eg can be pivoted from the working position to the rest position in a winding shaft change, to then provide sufficient freedom of movement for the remaining parts of the winding device.

According to one proposal of the invention, the stabilizing rollers are pivotable by means of a common pivoting device, so that only one drive for the pivoting device is needed.

However, it is also conceivable in the same way to provide each stabilizing roller with its own pivoting device and a corresponding own drive, if this is desired in the context of the installation situation and product requirement of the specific winding device.

The pivoting device preferably comprises a pivoting lever actuated by a pressure cylinder, on whose one lever arm the pressure cylinder engages and on whose other lever arm the stabilizing rollers are fastened. This is not only a simple drive of the stabilizing rollers from the rest position in the working position and back allows, but such Anschwenkeinrichtung can usually be retrofitted with little effort to existing winding devices or integrate into this.

If the stabilizing rollers are fastened to a common pivoting lever of a pivoting device, it is also proposed that the stabilizing rollers are articulated to the lever arm by means of an articulated arm pivotable about a pivot bearing, so that they are always uniform on the circumference of the winding shaft or of the coil forming thereon let create.

In order to effect a particularly effective elimination of the degrees of freedom and reliably counteract the occurrence of bending vibrations even at high winding speeds, the stabilizing rollers are preferably applied to the surface of the winding shaft or the coil forming thereon, generating a prescribable contact pressure, wherein a contact pressure in the range of 10 to 6,000 N is considered suitable. The respective concrete contact pressure to be determined by the expert in the context of the present system configuration.

If necessary, the contact pressure can be measured, for example, by means of pressure measuring devices arranged in the stabilizing rollers, in order to integrate a control circuit for the contact pressure into the control of the winding device.

The contact pressure can be exerted by the pressure acting on the pivot lever pressure cylinder, which can be configured for example as a pneumatic or hydraulic cylinder. With particular advantage, in this case both sides of the piston of the pressure cylinder can be subjected to controllable pressure, so that the spring properties of the swivel lever cushioning Andruckzylinders can be influenced. If the pressure cylinder is subjected to little or no counter pressure on the piston, soft suspension properties can be achieved, which are advantageous, for example, for winding blunt films. However, if the piston of the pressure cylinder is operated simultaneously with a back pressure of, for example, 2 bar when a predeterminable contact pressure is exerted against the surface of the winding shaft or the coil forming thereon, a hard spring characteristic is produced the Andruckzylinders, which is particularly advantageous when winding very smooth films.

Furthermore, it can be provided that the stabilizing rollers have a coating applied to the outer periphery thereof with at least two layers, wherein the inner layer is elastically formed with a lower hardness than the outer layer, so that the stabilizing rollers uniformly and vibration damping to the surface of the winding shaft or of the coil forming thereon, even if it is subject to a deflection.

Such coatings can be formed, for example, based on appropriately adjusted gummings of natural or synthetic rubber substrates, wherein more preferably the inner layer has a Shore A hardness of 2 to 30 and the outer layer has a Shore A hardness of 40 to 90.

Figur 1

in schematisierter Darstellung eine erfindungsgemäße Wickeleinrichtung kurz nach Beginn der Aufwicklung auf einer Wickelwelle

Figur 2

die Wickeleinrichtung gem. Figur 1 kurz vor Beendigung der Aufwicklung auf der Wickelwelle

Figur 3

die Anschwenkeinrichtung der erfindungsgemäßen Wickeleinrichtung in weiteren Details

Figur 4

eine Wickeleinrichtung nach dem Stand der Technik.

Further embodiments and details of the invention are explained below with reference to embodiments in the drawing. Show it:

FIG. 1

in a schematic representation of a winding device according to the invention shortly after the start of winding on a winding shaft

FIG. 2

the winding device acc. FIG. 1 just before the end of winding on the winding shaft

FIG. 3

the pivoting device of the winding device according to the invention in further details

FIG. 4

a winding device according to the prior art.

In the FIG. 4 is a winding device for winding a continuous material web 4, such as a plastic film web, on a winding shaft 3 to form a coil 40 of the material web 4 on the winding shaft 3 according to the prior art.

The material web 4 runs in the direction shown by arrow first via a guide roller 10 on a contact roller 1, which is provided for example with a rotary drive and is rotatably mounted within a fixed machine frame 2. After the material web 4 has been guided over a partial circumferential region of the rotating contact roller 1, it is transferred to a winding shaft 3, which is located in the friction operation on the circumference of the contact roller 1 and on which on a pushed over the winding shaft 3 cardboard tube 30, a coil 40th the wound material web 4 of gradually increasing diameter forms.

Characteristic of such so-called contact roller winder is that the winding shaft 3 in its winding position serving as shown in the FIG. 4 relative to the contact roller 1 in an approximately nine o'clock position, that is, on an approximately horizontal plane to the contact roller 1, but it reaches a considerable weight in particular with increasing diameter of the forming coil 40 and consequently subjected to a strong deflection in the direction of arrow D. is.

This deflection D causes, in particular, very slender, i. having small diameter winding shafts 3 and at the same time very high performance of the winding device with concomitant high speed of the winding shaft 3 bending vibrations, which cause the winding shaft 3, along its three degrees of freedom, namely in und.entgegen arrow D vertically up and down and in the direction of arrow A deflect horizontally away from the contact roller 1 due to vibration, which is very easy to form a gap between the coil 40 and the surface of the contact roller 1 and subsequent air entrapment in the forming coil 40 on the winding shaft 3, which adversely affects the winding quality.

To counter this problem, is in the FIGS. 1 to 3 Winder shown in more detail in the same parts to the representation according to FIG. 4 are provided with the same reference numerals and will not be explained again separately to avoid repetition, unless this is necessary for understanding the invention, additionally provided with a pair of stabilizing rollers 5a, 5b, like the contact roller 1 on the surface of the winding shaft. 3 or of the coils 40 of the material web 4 forming thereon can be applied. The stabilizing rollers are in this case with respect to the winding shaft 3 of the contact roller 1 with respect.

It will be one on the basis of FIG. 3 used in the following in more detail pivoting device 6 with a drive and pressure cylinder 60, by means of which the two stabilizing rollers 5a, 5b from a rest position remote from the winding shaft 3 in the in the FIG. 1 shown work position are pivotable in which they roll on the surface of the forming coil 40 on the winding shaft 3.

Due to the pivoting is ensured that the stabilizing rollers 5a, 5b, for example, when changing the fully wound winding shaft 3 do not interfere with the associated movements, however, are applied directly when winding a new winding shaft 3 with the first turns of a forming coil 40 on the surface can and in the subsequent occurring diameter growth of the coil 40 of this contact with the surface of the same persists.

The arrangement of the stabilizing rollers 5a, 5b is selected such that the central axis M1 of the stabilizing roller 5a comes to rest above the horizontal plane H passing through the center axis of the winding shaft 3 and the contact roller 1, while the center axis M2 of the further stabilizing roller 5b extends below the horizontal plane H. ,

As can be seen from a comparative analysis of the FIG. 1 at just wound winding shaft 3 and the FIG. 2 with its maximum diameter approaching coil 40 results on the winding shaft 3, the stabilizing rollers 5a, 5b with their respective center axes M1, M2 even when reaching the maximum coil diameter with respect to the horizontal plane H still in this Arrangement, ie the center axis M1 of the stabilizing roller 5a is always located above the horizontal plane E, while the center axis M2 of the stabilizing roller 5b is always below the horizontal plane H.

In its applied to the circumference of the forming coil 40 on the winding shaft 3 working position acc. Figures 1 and 2 Take the stabilizing rollers 5a, 5b of the winding shaft 3 and the forming thereon coil 40 according to the prior art according to FIG. 4 unavoidable degrees of freedom that led to the occurrence of bending vibrations to the unwanted loss of contact between the coil 40 and the contact roller 1. Accordingly, when using the stabilizing rollers 5a, 5b, the occurrence of bending vibration is effectively counteracted and the winding result is significantly improved.

It is understood that, in addition, further measures can be used to support, in particular, the winding shaft 3 in, for example, from the DE 198 55 781 A1 be known manner four times stored at their shaft ends to further minimize the deflection.

A further increase in the effectiveness of the two stabilizing rollers 5a, 5b is achieved in that over the pressure cylinder 60 of the pivoting device 6 a specifiable and defined contact pressure of the stabilizing rollers 5a, 5b on the surface of the winding shaft 3 and the coil 40 forming thereon against the the contact roller 1 exerted pressure is applied. Such a contact pressure is advantageously in the range between 10 and 6,000 N, is suitably adjustable via the control of the pressure cylinder 60 and can optionally also be provided by pressure measuring devices, e.g. Pressure measuring cans in the stabilizing rollers 5a, 5b are measured and controlled as part of an automated control.

The pivoting device 6 for applying the stabilizing rollers 5a, 5b to the surface of the winding shaft 3 or of the coil 40 forming thereon is in the FIG. 3 shown in more detail.

In addition to the already described pressure cylinder 60, the two stabilizing rollers 5a, 5b attached to a pivot lever 61 which is attached via a rotary joint 611 to the stationary machine frame 2 and about the pivot 611 is pivotable. Here, the pressure cylinder 60 engages a first lever arm 610 of the pivot lever 61, while the two stabilizing rollers 5a, 5b are attached to the second lever arm 612 of the pivot lever 61.

The attachment of the two stabilizing rollers 5a, 5b on the second lever arm 612 takes place here but not directly, but via a further pivot bearing 63 and a rotatably mounted thereon articulated arm 62 which has an approximately V-shaped configuration and at its two ends in each case a stabilizing roller 5a and 5b rotatably supports.

It is understood that the from the FIG. 3 apparent pivoting mirror image also on the other side not shown here and the corresponding second end of the stabilizing rollers 5a, 5b is provided.

The articulated mounting and attachment of the stabilizing rollers 5a, 5b via the articulated arm 62 and the pivot bearing 63 on the second lever arm 612 ensures a uniform and optimal installation of both stabilizing rollers 5a, 5b regardless of the actual prevailing diameter of the forming on the winding shaft 3 coil.

The presentation of the FIG. 3 with completely retracted piston of Andruckzylinders 60 shows the working position of the stabilizing rollers, while fully extending the piston of Andruckzylinders 60, the two pressure rollers 5a, 5b are pivoted clockwise about the pivot 611 so that they reach a rest position in which they continue Movement of parts of the winding device, not hinder in the course of a winding shaft change.

In addition, an adjustable contact pressure on the stabilizing rollers 5a, 5b and thus on the pressure cylinder 60 in working position the coil 40 resting against it can be exerted on the winding shaft 3, it also being possible to provide the piston of the pressure cylinder 60 on both sides with an adjustable pressure in order to influence its spring characteristic, as has already been explained above.

Finally one recognizes in the representation according to FIG. 3 nor that the two stabilizing rollers 5a, 5b starting from an example metallic core 50 have a two-layer coating with an inner layer 51 and an outer layer 52, the latter at the same time forms the outer periphery of the stabilizing rollers 5a, 5b. These two coatings 51, 52 may be selected, for example, from rubbers based on natural or synthetic rubber, wherein the inner layer 51 has a lower Shore A hardness of about 2 to 30 and the outer layer 52 has a higher Shore A hardness of about 40 to 90, whereby a particularly gentle treatment of the running on the outer circumference of the outer layer 52 coil 40 is ensured. The inner layer 51 may also be foamed, so that gas bubbles are included, which additionally have a particularly good vibration damping property.

It is understood that within the scope of the invention, embodiments of the winding device deviating from the drawings may also be provided.

Thus, it is conceivable, for example, not only to support the stabilizing rollers 5a, 5b rotatably, but also to provide them with their own rotary drive, which synchronizes with the rotational speed of the winding shaft 3 or of the coil 40 forming thereon as part of the control of the winding device becomes. In this way, the winding tension of the wound up to the coil 40 web 4 can be made uniform and even when Anwickeln a new winding shaft 3 on the first revolutions thereof, a pre-acceleration can be effected to further improve the winding result.

Moreover, it is also possible, instead of the common support of both stabilizing rollers 5a, 5b shown in the drawings, to use only one pivoting device 6 and also each individual stabilizing roller 5a or 5b to be provided with its own pivoting device. For example, the stabilizing roller 5a could by means of a similar as in Example FIG. 3 arranged pivot lever 61 are pivoted from an upper rest position to a lower working position and the positioned below further stabilizing roller 5 b are pivoted from a lower rest position to an upper working position by means of its own formed in approximately mirror symmetry to the horizontal configuration or linear movements are from the rest position in provided the working position and back again, which are performed by appropriately trained Verschwenkeinrichtungen.

Claims (12)

1. Winding apparatus for winding a continuously fed material web (4) onto a winding shaft (3) with the formation of a coil (40) of the material web (4) on the winding shaft (3), a contact roller (1) which is rotatably mounted in the winding apparatus being provided, by means of which the material web (4) to be wound can be guided and can be delivered by the latter to the winding shaft (3) or the coil (40) being formed thereon, wherein at least two stabilising rollers (5a, 5b) are provided, which can be placed by a pivoting apparatus (6) on the side of the winding shaft (3) opposing the contact roller (1) on the surface of the winding shaft (3) or of the coil (40) being formed thereon and, when not being used, can be lifted therefrom by means of the pivoting apparatus (6), wherein when the stabilising rollers (5a, 5b) are placed on the surface of the winding shaft (3) or of the coil (40) being formed thereon, the centre axis (M1) of the first stabilising roller (5a) always extends above the horizontal plane (H) extending through the centre axis of the winding shaft (3) and the centre axis (M2) of the second stabilising roller (5b) always extends below it.
2. Winding apparatus according to claim 1, wherein the stabilising rollers (5a, 5b) can be pivoted by means of the pivoting apparatus (6) from a rest position remote from the winding shaft (3) into a working position, in which they can be placed on the surface of the winding shaft (3) or of the coil (40) being formed thereon and conversely can be pivoted from the working position into the rest position.
3. Winding apparatus according to either of claims 1 or 2, wherein the stabilising rollers (5a, 5b) can be pivoted by means of a common pivoting apparatus (6).
4. Winding apparatus according to either of claims 1 or 2, wherein the stabilising rollers (5a, 5b) in each case have their own pivoting apparatus (6).
5. Winding apparatus according to any one of claims 1 to 4, wherein the pivoting apparatus comprises a pivoting lever (61) actuated by a pressure cylinder (60), the pressure cylinder (60) engaging on a lever arm (610) thereof and the stabilising rollers (5a, 5b) being fastened to another lever arm (612) thereof.
6. Winding apparatus according to claim 5, wherein the stabilising rollers (5a, 5b) are articulated to the lever arm (612) by means of an articulated arm (62) which can be pivoted about a pivot bearing (63).
7. Winding apparatus according to any one of claims 1 to 6, wherein the stabilising rollers (5a, 5b) can be placed on the surface of the winding shaft (3) or of the coil (40) being formed thereon with the production of a predeterminable contact pressure.
8. Winding apparatus according to claim 7, wherein a contact pressure of 10 to 6,000 N can be set.
9. Winding apparatus according to claim 7 or 8, wherein the contact pressure can be measured by means of pressure measuring apparatuses arranged in the stabilising rollers (5a, 5b).
10. Winding apparatus according to any one of claims 5 to 9, wherein the pressure cylinder (60) can be acted on with pressure on both sides of its piston.
11. Winding apparatus according to any one of claims 1 to 10, wherein the stabilising rollers (5a, 5b) have a coating applied to the external periphery thereof with at least two layers (51, 52), the inner layer (51) being formed resiliently with a lower hardness than the outer layer (52).
12. Winding apparatus according to claim 11, wherein the inner layer (51) has a Shore A hardness of 5 to 30 and the outer layer (52) has a Shore A hardness of 40 to 90.

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