EP2524081A2

EP2524081A2 - Draft correcting device for a conveyed material web and corresponding method

Info

Publication number: EP2524081A2
Application number: EP11708679A
Authority: EP
Inventors: Bernhard Fischer
Original assignee: Mahlo GmbH and Co KG
Current assignee: Mahlo GmbH and Co KG
Priority date: 2010-01-15
Filing date: 2011-01-12
Publication date: 2012-11-21
Anticipated expiration: 2031-01-12
Also published as: EP2524081B1; WO2011085716A3; WO2011085716A2; DE102010024618A1

Abstract

The invention relates to a device and a corresponding method for the draft correction of a conveyed, in particular textile, material web (W), in which at least two flexed rolls (3, 4) are provided in a machine frame (2), the free ends (3', 3", 4', 4") of said flexed rolls being connected to each other by means of a holding plate (5, 6) respectively. According to the invention, both holding plates (5, 6) are disposed opposite of one another and are rotatably mounted about a common rotational axis (D) on the machine frame (2). It is particularly advantageous that both flexed rolls (3, 4) are pivotably mounted on both holding plates (5, 6).

Description

Device for delay correction of a conveyed web and associated method

The invention relates to a device for delay correction of a subsidized

Web according to the preamble of claim 1 and an associated method according to the preamble of claim 1 1.

During the mechanical manufacturing and processing of particular textile webs often occurs a delay in goods. Such delays the

Web change the structure of goods made from these goods

For example, textiles or woven carpets, which in turn the

Use value of the goods is reduced 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. Here, a distinction is made between the longitudinal threads ("warp") and the transverse threads ("weft"). Due to the usually oblique to the direction of goods running distortion ("skew") or arcuate to goods running direction distortion ("bow distortion") of the textile web, the orthogonal textile structure of warp and weft is deformed. The originally 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 a bow rollers of the conveying path of the web in the direction of web travel at the web edges different from the goods train center, so that by suitable on or swinging the bow rollers in the conveyed web and the consequent wrap angle of the web of each present bow distortion can be corrected.

Furthermore, straightening machines for correcting bow distortions are subsidized

Web of increased weight, in particular of webs for the production of carpets known, which comprise at least two bow rollers whose free ends are connected to rotatable support members which are mechanically coupled about a common axis of rotation drivable stored in a machine frame.

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. For correction of

Arc distortions "Center before" and "Edge before" is a complete turn

Roller arrangement about the holding elements required by about 180 °, which is particularly disadvantageous results in a certain death time in the processing of the web.

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 distortion in a conveyed web, in particular the correction of low 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 1 1.

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 to delay an optimized straightening result is achieved and partial distortion avoided by the full-scale investment 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 applications of the invention also result from the following

Description of embodiments and of the figures. In this case, all described and / or illustrated features alone or in any combination in principle subject of the invention, regardless of their

Summary in the claims or their dependency. Also, the content of the claims becomes. a part of the description.

It is expressly understood, however, that the invention should by no means be limited to the examples given. Show it 1 shows by way of example a schematic cross section through an inventively designed device for distortion correction in neutral position,

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

FIG. 3 shows by way of example a schematic cross section through the device according to the invention for distortion correction according to FIG. 1 in a second correction position.

In the figures 1-3 is in each case a schematic cross section through a

Inventively designed device 1 for delay correction of a conveyed, in particular textile web W in different default correction positions NS, KS 1, KS2 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 by which the web W is conveyed through and thereby undergoes a processing. The basic technical structure of such straightening machines 1 and in particular the machine frames 2 provided for this purpose is sufficiently known from the prior art and can be of very different types

Have implementation forms. 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 middle 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 the processed textile web W in one

Movement direction WL supplied. The web W is through the first

Deflection roller 7 deflected and supplied from the arrangement of the two bow rollers 3, 4 existing 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 appropriately pivoting the first and second sheet rollers 3, 4 around 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 and second bow rollers 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. The first and second

Arc roller 3, 4 are each rotated in such a way, for example, that an imaginary connecting line through the vertices S, S 'through the common axis of rotation D of the holding elements 5, 6 extends. 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, 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 sheet rolls 3, 4 takes place about the roll axis WD, WD ', which parallel to the common axis of rotation D of

Holding plates 5, 6 extends, wherein in each case the roller axis WD, WD 'and the associated arcuate longitudinal axis of a bow roller 3, 4 each define a roller plane E, E'. The bow rollers 3, 4 are for

Distortion correction in each case so pivoted about their rolling rotational axes WD, WD 'that the rolling planes E, E' each parallel to each other regardless of the pivot position.

Hereinafter, the different correction positions of the straightening arrangement, which are provided for correcting different distortions, will be described in detail with reference to FIGS. 1-3, wherein FIG. 1 shows a neutral position NS of the straightening machine 1. FIG. 2 shows the straightening arrangement in a first correction position KS1 for the correction of a distortion "middle in front" and FIG. 3 in a second correction position KS2 for the correction of a distortion "edge in front".

In order to explain the type of default to be corrected in each case, a graphic symbol is provided in FIGS. 1 to 3, which indicates the present distortion of the material web W with respect to the direction of travel WL.

In Fig. 1, the graphic symbol consists of a parallel arrangement of lines, i. no distortion, in Fig. 2 from an arcuate arrangement of lines, wherein the goods center in the direction of travel WL the edges leading ("center before") and in Fig. 3 also from an arcuate arrangement of the lines, the edges of the goods center with respect to advance the direction of yarn movement WL ("edge forward").

In the neutral position NS shown in FIG. 1, the roll planes E, E 'preferably run parallel to the fabric direction WL and thus to the goods plane, ie the first and second sheet rolls 3, 4 easily touch the web W, 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.

For distortion correction according to the invention, both the holding elements 5, 6 and the first and second bow rollers 3, 4 approximately simultaneously around their respective

Rotation axis D or roller rotation axis WD, WD 'in the same or a

rotated opposite direction of rotation, whereby the

Umschlingwinkel 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 adjustable is. 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 KS 1, the holding elements 5, 6 and the bow rollers 3, 4 pivoted or rotated in the same direction, whereby the wrap angle uw 'at the apex S, S' compared to the wrap angle uw at the free ends 3 ', 3 "and 4 ', 4" of the sheet rolls 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" can be addressed accordingly

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" determined.

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 Figure 2, the conveying path in the region of the middle of the web W in comparison to the conveying path in the region of the edges of the web W increases, whereas, upon rotation of the holding elements 5, 5 'and the

Sheet rolls 3, 4 in opposite direction of rotation according to Figure 2, the conveying path in the region of the middle of the web W is reduced in comparison to the conveying path in the region of the edges of the web W.

In the first correction position KS1 is thus a straightening of arcuate

Distortion "center before" and in the second correction position KS2 of arcuate curves "edge before" possible, with particular advantage, the holding elements 5, 6 are always rotated starting from the neutral position NS in the same direction of rotation, which is preferably oriented in the web direction 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.

Here, FIGS. 2 and 3 show, for example, the first and second correction positions KS1, KS2 with maximum directivity. It is understood that between de

Neutral position NS and the directional positions shown in Fig. 2 and 3, a plurality 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 sheet rolls 3, 4 in a predetermined ratio to each other, due to the addition of DrehVSchwenkbewegungen 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 swivel movements takes place due to the counter-rotating movements.

In the straightening positions with maximum directivity shown in FIGS. 2 and 3, the rolling planes E, E 'in each case form the bisectors of the wrap-around angles uw, uw'.

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.

I i ste

1 leveler

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

8 second guide roller

D common axis of rotation

DB, DB 'deflection

E, E 'Walzenebene

KS1 first correction position

KS2 first correction position

M, M 'middle pivot point

NS neutral position

S, S 'vertices of the bow rollers

W goods train

WD, WD 'roll axis

WL goods direction

uw, uw 'wrap angle

Z space

Claims

claims

1 . Device for delay correction of a conveyed, in particular textile

Web (W), in which in a machine frame (2) at least two

Sheet rolls (3, 4) are provided, the free ends (3 ', 3 ", 4', 4") by means of a respective holding plate (5, 6) are interconnected, wherein the two holding plates (5, 6) lying opposite each other and rotatable about one

common axis of rotation (D) mounted on the machine frame (2) are arranged, characterized in that the two bow rollers (3, 4) are pivotally mounted on the two holding plates (5, 6).

2. Apparatus according to claim 1, characterized in that each sheet roll (3, 4) about a parallel to the common axis of rotation (D) extending

Roll axis (WD, WD ') are pivotally mounted.

3. Apparatus according to claim 1 or 2, characterized in that the first and second bow rollers (3, 4) are formed synchronously to each other pivotally.

4. Device according to one of claims 1 to 3, characterized in that the sheet rolls (3, 4) are arranged spaced from each other, wherein the web (W) by the of the two bow rollers (3, 4)

enclosed space (Z) is conveyed in a predetermined direction of web travel (WL).

5. Device according to one of claims 1 to 4, characterized by a

Neutral position (NS) of the bow rollers (3, 4), in which the bow rollers (3, 4) are in slight contact with the conveyed web (W), but no distortion correction takes place.

6. Device according to one of claims 1 to 5, characterized by a first correction position (KS1) for the correction of a delay "center before" and a second correction position (KS2) for the correction of a delay "edge before".

7. Apparatus according to claim 6, characterized in that by a in

Web movement direction (WL) oriented rotation of the holding plates (5, 6) a change from the neutral position (NS) in the first or second correction position (KS1, KS2) takes place.

8. Device according to one of claims 2 to 7, characterized in that the roller axes (WD, WD ') through the centers of the two free ends (3', 3 "or 4 ', 4") of the first and second arc roller 3, 4 run.

9. Device according to one of claims 6 to 8, characterized in that in the first correction position (KS1) the wrap angle (uw ') of the web (W) at the apex (S, S') in comparison to the wrap angle (uw) of the web ( W) at the free ends (3 ', 3 "and 4', 4") of the sheet rolls (3, 4) is smaller.

10. Device according to one of claims 6 to 9, characterized in that in second correction position (KS2) of the wrap angle (uw) of the web (W) at the free ends (3 ', 3 "and 4', 4") of the bow rollers (3, 4) compared to the wrap angle (uw ') of the web (W) in the vertex (S, S') is smaller.

1 1. Method for distortion correction of a subsidized, in particular textile

Web (W), in which a web (W) over at least two

Arc rollers (3, 4) is guided, the free ends (3 ', 3 ", 4', 4") by means of a respective holding plate (5, 6) are interconnected, wherein the two

Holding plates (5, 6) opposite each other and rotatable about a common axis of rotation (D) in a straightening arrangement (1) are mounted, characterized in that for distortion correction, the two bow rollers (3, 4) in each case about a parallel to the common axis of rotation (D) in the web (W) are pivoted.

12. The method according to claim 1 1, characterized in that the

Distortion correction approximately simultaneously both the holding elements (5, 6) about the common axis of rotation (D) and the first and second bow rollers (3, 4) about the roll axis (WD, WD ') rotated in the same or an oppositely directed direction of rotation be panned.

1 3. The method according to claim 12, characterized in that the approx

simultaneous pivoting / rotation of the holding elements (5, 6) and bow rollers (3, 4) takes place in a predetermined relationship to each other.

14. The method according to any one of claims 1 1 to 12, characterized in that to achieve a first correction position (KS1) for correcting a delay "center before" the holding elements (5, 6) and the bow rollers (3, 4) in the same direction of rotation be pivoted or rotated.

15. The method according to any one of claims 1 1 to 14, characterized in that to achieve a second correction position (KS2) for correcting a delay "edge before" the holding elements (5, 6) and the bow rollers (3, 4) in

be pivoted or rotated opposite direction of rotation.

16. The method according to any one of claims 14 or 1 5, characterized in that approximately simultaneous pivoting or rotation of the holding elements (5, 6) and the bow rollers (3, 4) of the wrap angle (uw ') of the web (W) at the apex (S, S ') compared to the wrap angle (uw) of the web (W) is changed differently at the free ends (3 ', 3 "and 4', 4") of the sheet rolls (3, 4).