EP2524081B1 - Draft correcting device for a conveyed material web and corresponding method - Google Patents

Description

The invention relates to a device for distortion correction of a conveyed web according to the preamble of claim 1 and an associated method according to the preamble of claim 10.

During the mechanical manufacturing and processing of particular textile webs often occurs a delay in goods. Such delays of the web change the structure of the goods produced therefrom such as textiles or woven carpets, which in turn reduces the utility of the goods and / or the further processing of the goods is impaired.

A textile material web consists in particular of threads crossed at right angles, which are produced during the weaving process in the loom or in the weaving machine. A distinction is made here between the longitudinal threads ("warp") and the transverse threads (weft) .The orthogonal textile structure becomes due to the distortion ("skewed draft") or bowing to the fabric running direction ("bow distortion") The original orthogonal structure of warp and weft or their courses are thus changed obliquely or arcuately.

To compensate for arc-like distortion of the web, devices or so-called straightening machines are known in which by means of arches arranged arcuately to the fabric direction of the textile web sheet rolls the existing bow distortions are compensated by appropriate application of compensating forces on the conveyed web. In particular, in such sheet rolls, the conveying path of the web in the direction of web travel at the web edges is different from the web center, so that can be corrected by suitable pivoting in or out of the bow rollers in the conveyed web and the consequent wrap angle of the web of each present bow distortion.

Further, straightening machines for correcting bow distortion in conveyed web with increased weight, in particular of webs for the production of carpets are known, which comprise at least two bow rollers, the free ends are connected to rotatable support members which are mechanically coupled about a common axis of rotation drivable stored in a machine frame are. Here, the bow rollers are fixed to each other at a predetermined distance mounted on the two holding plates and thus provide a rigid connection between them. The centers of the free ends of the sheet rolls and the fulcrum of the holding plates are arranged in a plane receiving the common axis of rotation of the holding plates. The bowing of the bow rolls respectively faces outwardly, along an imaginary line perpendicular to the line connecting the centers of the free ends of the bow rolls and the pivot point of the retaining plates. Thus, the deflections of the sheet rolls in opposite directions from the holding plates to the outside, wherein the mid-point profile of the respective sheet roll receiving center plane of the sheet rolls parallel to each other. The disadvantage is a slight partial distortion in the web produced when pivoting the described roller assembly by the leveler itself until the desired distortion correction can be performed. To correct bow distortions "center before" and "edge before" a rotation of the complete roller assembly on the holding elements by about 180 ° is required, which is particularly disadvantageous results in a certain dead time in the processing of the web.

Furthermore, from the DE 20 24 309 A1 a continuously operating device for controlling the width and direction of a moving web, in which at least two bow rollers are provided in a machine frame, the free ends are connected to each other via a respective holding plate, wherein the two holding plates mounted opposite each other and rotatable about a common axis of rotation are arranged in the machine.

From the DE 12 34 179 B and the DE 40 26 268 A1 are also generic devices for aligning weft threads of a running fabric track to remove.

Proceeding from this, the present invention seeks to provide a device and an associated method for delay correction of conveyed webs, which allows an accurate and effective correction of distortions in a conveyed web, in particular the correction of minor distortion in webs with increased weight such as Webs for the production of carpets. The object is achieved on the basis of a device according to the preamble of claim 1 by its characterizing features. The features of the method according to the invention are listed in the patent claim 10.

The essential aspect of the device according to the invention is the fact that the two bow rollers are each mounted pivotably on the holding plates. Particularly advantageously, this eliminates any dead time when changing between the first and second correction position for the correction of arcuate displacements "center before" or "edge forward". The straightening mechanism also makes it possible to reduce the wrapping of the goods to the sheet rolls to a minimum necessary level, whereby the burden on the sheet rolls and connected to these drive components by the Warenzug is kept as low as possible.

Advantageously, the bow rollers are each pivotally mounted about a parallel to the common axis of rotation extending roll axis and this formed synchronously to each other pivotally. Due to the proportional control of the sheet roll rotation for the delay an optimized straightening result is achieved and partial distortion avoided by the full-surface conditioning of the web at the bow rollers.

The invention will be explained in more detail by means of embodiments in conjunction with the figures. In addition, developments, advantages and possible applications of the invention also result from the following description of embodiments and from the figures. In this case, all described and / or illustrated features alone or in any combination are fundamentally the subject of the invention, regardless of their summary in the claims or their dependency. Also, the content of the claims is made an integral part of the description.

Fig. 1

beispielhaft einen schematischen Querschnitt durch eine erfindungsgemäß ausgebildete Vorrichtung zur Verzugskorrektur in Neutralstellung,

Fig. 2

beispielhaft einen schematischen Querschnitt durch die erfindungsgemäß ausgebildete Vorrichtung zur Verzugskorrektur gemäß Figur 1 in einer ersten Korrekturstellung und

Fig. 3

beispielhaft einen schematischen Querschnitt durch die erfindungsgemäß ausgebildete Vorrichtung zur Verzugskorrektur gemäß Figur 1 in einer zweiten Korrekturstellung.

It is expressly understood, however, that the invention should by no means be limited to the examples given. Show it

Fig. 1

by way of example a schematic cross section through an inventively designed device for distortion correction in neutral position,

Fig. 2

by way of example a schematic cross section through the device according to the invention for distortion correction according to FIG FIG. 1 in a first correction position and

Fig. 3

by way of example a schematic cross section through the device according to the invention for distortion correction according to FIG FIG. 1 in a second correction position.

In the Figures 1 - 3 in each case a schematic cross section through an inventively designed device 1 for delay correction of a conveyed, in particular textile web W in different default correction positions NS, KS1, KS2 is shown.

The apparatus 1 for delay correction, hereinafter also referred to as straightening machine, comprises, for example, a schematically indicated in the figures machine frame 2, which is preferably frame-like and in which at least one of a plurality of bow rollers 3, 4 existing straightening unit is added.

For example, the machine frame 2 forms a rigid, rectangular frame, through which the web W is conveyed through and thereby undergoes a processing. The basic technical structure of such straightening machines 1 and in particular of the machine frames 2 provided for this purpose is sufficiently known from the prior art and can have very different forms of implementation.

In the present exemplary embodiment, the apparatus for distortion correction or straightening machine 1 comprises at least one first and second sheet roll 3, 4 whose free ends 3 ', 3 "or 4', 4" are each connected to a first or second holding plate 5, 6 , The first and second holding plate 5, 6 are arranged opposite each other in the machine frame 2 and each rotatably supported about a common axis of rotation D on the machine frame 2. The drive of the two holding plates 5, 6 is preferably mechanically coupled and takes place via a common, not shown in the figures drive unit.

The first and second holding plate 5, 6 preferably have a circular cross-section and are rotatably mounted in their center or pivot points M, M ', wherein the center or pivot points M, M' come to rest on the common axis of rotation D. Here, the rotational movement of the preferably circular-shaped holding plates 5, 5 'realized around its center M, M', for example via a mechanism and the mechanics driving electric motor.

About a input side arranged in the machine frame 2 first guide roller 7 of the leveler 1 is supplied to be processed textile web W in a fabric direction WL. The web W is deflected by the first guide roller 7 and supplied to the existing of the arrangement of the two bow rollers 3, 4 straightening unit. The first and second sheet rolls 3, 4 are spaced from each other, in such a way that between the two sheet rolls 3, 4, a gap Z results, through which the web W in the predetermined fabric direction WL is feasible, i. the web W is conveyed through between the two bow rollers 3.4.

By corresponding rotation of the holding elements 5, 6 about the common axis of rotation D thus the bow rollers 3, 4 in the web W on and be pivoted out again. On the output side, for example, a second guide roller 8 is provided, via which the web W is conveyed after leaving the straightening arrangement of the leveler 1. Preferably, the first and second Deflection roller 7, 8 also designed to be driven mechanically to ensure sufficient product feed, in particular when processing webs W with increased weight in the direction of web travel WL.

According to the invention, the first and second bow rollers 3, 4 are each pivotally mounted on the opposite holding plates 5, 6, in each case about a parallel to the common axis of rotation D of the holding elements 5, 6 extending roll axis WD, WD '. The roll axes WD, WD 'pass through the centers of the two free ends 3', 3 "and 4 ', 4" of the first and second sheet rolls 3, 4. By pivoting the first and second sheet rolls 3, 4 about their respective roll axis WD, WD ', the vertex S, S' of the deflection DB of the first and second sheet rolls 3, 4 is guided on a circular path concentrically surrounding the roll axis WD, WD '.

By suitable pivoting of the first and second sheet rolls 3, 4 about the roll axis WD, WD 'clockwise or counterclockwise or counter to or in the direction of rotation of the holding plates 5, 6, for example, the distance between the vertices S, S' of the deflection DB of the first or second bow roller 3, 4 varies. With simultaneous rotation of the holding plates 5, 6, and simultaneously with the pivoting of the first and second sheet rolls 3, 4, the wrap angle of the sheet rolls 3, 4 is changed by the web W. For example, the first and second sheet rolls 3, 4 are each rotated relative to one another in such a way that an imaginary connecting line runs through their vertices S, S 'through the common axis of rotation D of the holding elements 5, 6. The first and second bow rollers 3, 4 are also designed to be driven in a preferred embodiment by a mechanism about their arcuate central longitudinal axes.

The first and second bow rollers 3, 4 are also mechanically coupled to each other so that they are synchronously pivotable to each other. The first and second bow rollers 3, 4 preferably have the same deflection DB and are both in the direction of rotation of the holding plate 5, 6 and in the opposite direction of rotation pivotable. The pivoting of the first and second bow rollers 3,4 takes place about the roll axis WD, WD ', which runs parallel to the common axis of rotation D of the holding plates 5, 6, wherein in each case the roll axis WD, WD' and the associated arcuate center longitudinal axis of a bow roll 3, 4 each a roll plane E, E 'span. The bow rollers 3, 4 are each warped for distortion correction about their roll rotation axes WD, WD ', that the roll planes E, E' each independently of the pivot position parallel to each other.

Hereinafter, the different correction positions of the straightening arrangement, which are provided for the correction of different distortions, in detail on the basis of Figures 1 - 3 described, in Fig. 1 a neutral position NS of the leveler 1 is shown. FIG. 2 shows the straightening arrangement in a first correction position KS1 for correcting a delay "center before" and FIG. 3 in a second correction position KS2 for correction of a delay "edge before".

To explain the respectively to be corrected delay type is in the FIGS. 1 to 3 in each case a graphic symbol provided, which indicates the present delay of the web W with respect to the direction of travel WL.

In Fig. 1 the graphic symbol consists of a parallel arrangement of lines, ie no distortion, in Fig. 2 from an arcuate arrangement of lines, wherein the goods center in the direction of travel WL leads the edges ("center before") and in Fig. 3 also from an arcuate arrangement of the lines, wherein the edges of the goods center in relation to the direction of travel WL leading ("edge before").

In the in FIG. 1 illustrated neutral position NS run the roll planes E, E 'preferably parallel to the fabric direction WL and thus to the goods level, ie, the first and second bow rollers 3, 4 easily touch the web W, and indeed over the entire fabric width. Here, the web W is, for example, from the bottom of the first sheet roll 3 and from the top of the second bow roller 4th touched, whereby a line-like contact between the first and second sheet roll 3, 4 and the conveyed web W is formed. Since there is no looping of the bow rollers 3, 4 through the web W, there is no distortion correction by the straightening unit or straightening arrangement.

In order to correct the distortion, both the holding elements 5, 6 and the first and second sheet rolls 3, 4 are rotated approximately simultaneously about their respective axis of rotation D or roll rotation axis WD, WD 'in the same or an opposite direction of rotation, whereby the wrap angle uw, uw 'of the web W with respect to the two bow rollers 3, 4 at the free ends 3', 3 "and 4 ', 4" of the bow rollers 3, 4 different from the vertex S, S' of the bow rollers 3, 4 is adjustable. The maximum angle of rotation of the holding elements 5, 6 is for example 90 °.

In order to obtain the respective directivity required in the neutral position NS, the wrap-around angle uw, uw 'is 180 °, ie. the web W runs in a straight line between the two bow rollers 3, 4 therethrough without thereby a deflection of the web W takes place.

To achieve the first correction position KS1, the holding elements 5, 6 and the bow rollers 3, 4 are pivoted or rotated in the same direction of rotation, whereby the wrap angle uw 'at the vertex S, S' compared to the wrap angle uw at the free ends 3 ', 3rd "and 4 ', 4" of the bow rollers 3, 4 is reduced, ie the contact surface between the web W and the respective bow roller 3.4 at the apex S, S 'is greater than at the free ends 3', 3 "and 4 ', 4". As a result, a bow-shaped distortion "center before" can be addressed accordingly.

The second correction position KS2 is achieved in that the holding elements 5, 6 and the bow rollers 3, 4 are pivoted or rotated in different directions of rotation. As a result, the wrap angle uw at the free ends 3 ', 3 "and 4', 4" of the bow rollers 3, 4 in comparison to the wrap angle uw 'in the vertex S, S' reduced, ie the contact surface between the web W and the respective bow roller 3.4 in the apex S, S 'is smaller than at the free ends 3', 3 "and 4 ', 4". As a result, a bow-shaped delay "edge before" be addressed accordingly. The directivity is thus determined by the respective difference of the contact surface between the web W and the respective bow roller 3.4 in the apex S, S 'and at the free ends 3', 3 "and 4 ', 4".

Here, the conveying path of the web through the gap Z between the two bow rollers 3, 4 is changed in the region of the middle of the web W, namely at a rotation of the holding elements 5, 6 and the bow rollers 3, 4 in the same rotation pivoting direction is FIG. 2 the conveying path in the region of the middle of the web W increases in comparison to the conveying path in the region of the edges of the web W, whereas in a rotation of the holding elements 5, 5 'and the bow rollers 3, 4 in mutually opposite direction of rotation FIG. 2 the conveying path in the region of the middle of the material web W is reduced in comparison to the conveying path in the region of the edges of the material web W.

In the first correction position KS1 is thus a directing of arcuate displacements "center before" and in the second correction position KS2 of arcuate Verzügen "edge before" possible, with particular advantage, the holding elements 5, 6 are always rotated starting from the neutral position NS in the same direction , which is preferably oriented in the direction of travel WR. When turning the bow rollers 3, 4 remain independent of the correction position KS1, KS2 always in contact with the web W, so that no partial distortion in the web is generated by the straightening arrangement.

This show the Fig. 2 and 3 For example, the first and second correction position KS1, KS2 with maximum directivity. It is understood that between the neutral position NS and the in Fig. 2 and 3 shown straightening a variety of different straightening positions are adjustable to adjust the directivity individually to the current needs.

In a preferred embodiment, the simultaneous pivoting / rotating of the holding elements 5, 6 or bow rollers 3, 4 in a predetermined ratio to each other, due to the addition of the rotary / pivotal movements in the case of the first correction position KS1, the ratio is smaller than in the case of the second Correction position KS2, in which a subtraction of the rotary / pivoting movements takes place due to the counter-rotating movements.

In the in Fig. 2 and 3 illustrated straightening positions with maximum directivity forms the rolling planes E, E 'in each case the bisectors of Umschlingwinkel uw, uw' from.

The invention has been described above by means of an embodiment. It is understood that numerous modifications and variations of the invention are possible without departing from the inventive concept.

LIST OF REFERENCE NUMBERS

1

straightener

2

machine frame

3

first bow roller

3 ', 3 "

free ends

4

second bow roller

4 ', 4 "

free ends

5

first holding plate

6

second retaining plate

7

first deflecting roller

8th

second guide roller

D

common axis of rotation

DB, DB '

deflection

E, E '

rolling plane

KS1

first correction position

KS2

first correction position

M, M '

Medium / pivot point

NS

neutral position

S, S '

Vertices of the bow rollers

W

web

WD, WD '

roll axis

WL

Running direction

uw, uw '

Umschlingwinkel

Z

gap

Claims (15)

1. A device for the correction of warpage on a conveyed, in particular a textile, material web (W), in which at least two curved rollers (3, 4) are provided in a machinery frame (2); the free ends (3', 3", 4', 4") of the curved rollers are in each case connected with one another by means of a holding plate (5, 6), wherein the two holding plates (5, 6) are arranged such that they are located opposite one another and are mounted on the machinery frame (2) such that they can rotate about a common axis of rotation (D), characterised in that the two curved rollers (3, 4) are pivoted on the two holding plates (5, 6) such that each of the curved rollers is pivotable about a roller axis (WD, WD') running parallel to the common axis of rotation (D).
2. The device according to claim 1, characterised in that the first and second curved rollers (3, 4) are designed to be pivotable synchronously relative to one another.
3. The device according to claim 1 or 2, characterised in that the curved rollers (3, 4) are spaced apart from one another, wherein the material web (W) is conveyed through the intermediate space (Z) enclosed by the two curved rollers (3, 4) in a prescribed material running direction (WL).
4. The device according to one of claims 1 to 3, characterised by a neutral position (NS) of the curved rollers (3, 4), in which, although the curved rollers (3, 4) are in light contact with the conveyored material web (W), no correction of warpage takes place.
5. The device according to one of claims 1 to 4, characterised by a first correction position (KS1) for purposes of correcting "centre forward" warpage and a second correction position (KS2) for purposes of correcting "edge forward" warpage.
6. The device according to claim 5, characterised in that by means of a rotation of the holding plates (5, 6) oriented in the material running direction (WL) a change from the neutral position (NS) into the first or second correction position (KS1, KS2) takes place.
7. The device according to one of claims 1 to 6, characterised in that the roller axes (WD, WD') pass through the centres of the two free ends (3', 3" and 4', 4" respectively) of the first and second curved rollers (3, 4) respectively.
8. The device according to one of claims 5 to 7, characterised in that in the first correction position (KS1) the wrap angle (uw') of the material web (W) at the apex (S, S') is smaller in comparison to the wrap angle (uw) of the material web (W) at the free ends (3', 3" and 4', 4") of the curved rollers (3, 4).
9. The device according to one of claims 5 to 8, characterised in that in the second correction position (KS2) the wrap angle (uw) of the material web (W) at the free ends (3', 3" and 4', 4") of the curved rollers (3, 4) is smaller in comparison to the wrap angle (uw') of the material web (W) at the apex (S, S').
10. A method for the correction of warpage on a conveyed, in particular a textile, material web (W), in which a material web (W) is guided over at least two curved rollers (3, 4), the free ends (3', 3", 4', 4") of which are in each case connected with one another by means of a holding plate (5, 6), wherein the two holding plates (5, 6) are mounted in a straightening arrangement (1) such that they are located opposite one another and such that they can rotate about a common axis of rotation (D), characterised in that for purposes of correction of warpage the two curved rollers (3, 4) are in each case pivoted about a roller axis (WD, WD') running parallel to the common axis of rotation (D) into the material web (W).
11. The method according to claim 10, characterised in that for purposes of correction of warpage the holding elements (5, 6) are rotated or pivoted about the common axis of rotation (D) and near-simultaneously the first and second curved rollers (3, 4) are rotated or pivoted about the roller axis (WD, WD') in the same or opposing direction of rotation.
12. The method according to claim 11, characterised in that the nearsimultaneous pivoting/rotation of the holding elements (5, 6) and the curved rollers (3, 4) takes place in a prescribed relation.
13. The method according to claims 10 or 11, characterised in that for purposes of achieving a first correction position (KS1) so as to correct "centre forward" warpage the holding elements (5, 6) and the curved rollers (3, 4) are pivoted or rotated in the same direction of rotation.
14. The method according to claims 10 or 11, characterised in that for purposes of achieving a second correction position (KS2) so as to correct "edge forward" warpage the holding elements (5, 6) and the curved rollers (3, 4) are pivoted or rotated in opposite directions of rotation.
15. The method according to claims 13 or 14, characterised in that with nearsimultaneous pivoting or rotation of the holding elements (5, 6) and the curved rollers (3, 4) the wrap angle (uw') of the material web (W) at the apex (S, S') is altered in a different manner in comparison to the wrap angle (uw) of the material web (W) at the free ends (3', 3" and 4', 4") of the curved rollers (3, 4).

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