EP2573254B1 - Needle draft correcting device for correcting the draft of a textile sheet and associated method - Google Patents

Description

The invention relates to a Nadelrichtanordnung for distortion correction of a conveyed web according to the preamble of claim 1 and an associated method according to the preamble of claim 8.

During the mechanical manufacturing and processing process of conveyed webs occurs often 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. Here, a distinction is made between the longitudinal threads ("warp") and the transverse threads ("weft"). Due to the usually obliquely running to the direction of goods warp ("skew") or arcuate to the direction of goods running distortion ("bow distortion") of the textile web, the orthogonal textile structure of warp and weft is deformed. The original orthogonal structure of warp and weft or their courses are thus changed obliquely or arcuately, i. a skew and / or bow distortion exists.

To restore the original orthogonal structure, the textile web is guided over mechanical straightening arrangements, in which the existing distortions are compensated for by means of corresponding application of compensating forces on the moving textile material web by means of roll units arranged obliquely or arcuately to the running direction of the textile web. Such roll-based directing arrangements are preferably used to eliminate arcuate thread and stitch distortion.

Alternatively, so-called needle straightening arrangements are known in which the moving textile web is tensioned at the opposite web edges over at least two oppositely arranged needle straightening wheels transversely to the running direction of the textile web. By pivoting the directional wheels about a pivot axis in one given angle to the direction of the textile web and with a predetermined lateral force each side acting outward transverse stress is introduced into the textile web and thereby causes a spreading of the web. The web edges of the warped textile web are thus subjected to a defined straightening force to the outside, ie in the direction of the weft of the textile web. The result is a component of force that seeks to re-shape the parallelogram structure into the original orthogonal structure.

This results from the inclination of the directional wheels starting from Aufnadelstelle, in which there is a minimum spread value, an increase in the spread value of the web to a maximum spread value and after exceeding a decrease in the spread value of the web to the Abnadelstelle. Since at least a slight bow distortion is introduced by the directional wheels per se in the web, the Nadelrichtanordnung is often followed by a Bogenrichtwalzenanordnung.

Decisive for the extent of the introduced by the Nadelrichtanordnung residual distortions, especially sheet distortion is the time of removal or Abnadelns the textile web of the straightening wheels. For example, the bow distortion introduced by the needle straightening arrangement increases if the web is too late to be straightened from the straightening wheels, whereas if straightening is too early, even high straightening forces act on the fabric that the web is almost torn from the straightening wheels, causing edge distortion all the way may result to damage the fabric edges. The timing of the needling of the web or the selection of the Abnadelstelle of the straightening wheels is particularly dependent on the material properties, in particular their elasticity and / or the condition of the web, in particular the strength of the present goods delay. Also, the width of the web when needling special importance, which usually falls below the width of the web in the unloaded state due to the machine promotion of the web. In conventional Nadelrichtanordnungen the needling of the web takes place regardless of their web properties always the same, so that some high residual distortions are introduced into the web, which lead to increased mechanical complexity in the post-correction.

A Nadelrichtanordnung according to the preamble of claim 1 is made JP 2001200468 known.

Proceeding from this, the present invention seeks to provide a Nadelrichtanordnung and an associated method for adjusting the Abnadelstelle a Nadelrichtanordnung, which has an improved directivity compared to known Nadelrichtanordnungen. The object is achieved on the basis of a Nadelrichtanordnung 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 8.

The essential aspect of the device according to the invention is to be seen in that the needle roller is pivotally formed about a pivot axis. As a result, a web-individual adjustment of the Abnadelstelle is possible, which leads to a significantly improved distortion correction.

Further advantageous is the Abnadelstelle adjustable by pivoting the Abnadelwalze to the first and second pivot point of the needle-directional receiving pivot axis.

The needle straightening wheels are designed to produce a spreading profile with a first and second spreading profile area, the first and second spreading profile area being approximately symmetrical to one another. Advantageously, the Abnadelstelle is adjustable in the second Spreizungsprofilbereich.

The maximum spread value of the spreading profile of the straightening wheels is present at that end-side circumferential point of the straightening wheels, at which the distance of the pivot axis opposite the front circumferential point to the respective pivot axis is maximum. Preferably, in the second spread profile range, the spread value decreases from the maximum spread value toward the point of needling.

The subject matter of the present invention is also a method for adjusting the Abnadelstelle a at least two needle directions having needle straightening arrangement for distortion correction of a subsidized, especially textile web, in which the conveyed web is applied with the opposite edges of the fabric at a Aufnadelstelle on the Nadelrichträder and at a Abnadelstelle of the Needle direction wheels is removed again. Advantageously, the Abnadelstelle means a pivotable Abnadelwalze trajectory adjusted. To set the Abnadelstelle the Abnadelwalze is preferably pivoted along the circumference of Nadelrichträdern, the Abnadelstelle is adjusted depending on the material properties of the web, in particular their elasticity and / or the strength of the warpage of the web and / or the width of the web at the Aufnadelstelle.

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 eine perspektivische Ansicht einer erfindungsgemäßen Nadelrichtanordnung,

Fig. 2

beispielhaft einen schematischen Querschnitt durch eine Richtmaschine umfassend eine Nadelrichtanordnung gemäß Figur 1 sowie weitere Walzenanordnungen und

Fig. 3

beispielhaft eine schematischen Ansicht auf das durch die Nadelrichtanordnung erzeugte Spreizungsprofil der Warenbahn.

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 perspective view of a needle straightening arrangement according to the invention,

Fig. 2

by way of example a schematic cross section through a straightening machine comprising a needle straightening arrangement according to FIG FIG. 1 as well as other roller arrangements and

Fig. 3

by way of example a schematic view of the spreading profile of the fabric web produced by the needle straightening arrangement.

In FIG. 1 is shown in a perspective view of a needle straightening arrangement 1 according to the invention in a simplified representation, which have at least a first Nadelrichtrad 2 and a second Nadelrichtrad 3. The Nadelrichträder 2, 3 each have from the front side in the radial direction outwardly projecting needles, which distributes almost uniformly along the frontal periphery of the needle direction wheels 2 are. Such a needle straightening arrangement 1 can either be part of a textile processing machine or a straightening machine 4.

In FIG. 2 For example, a schematic cross-section through a straightening machine 4 is shown, which has a needle straightening arrangement 1 according to the invention. The web W is hereby conveyed in a web direction WL through the Nadelrichtanordnung 1 and thereby subjected to a straightening process. The straightening machine 4 comprises, for example, a schematic in FIG FIG. 2 indicated machine frame 5, in which the Nadelrichtanordnung invention 1 and further roller assemblies are added.

For example, the machine frame 5 forms a rigid, rectangular frame, through which the web W can be conveyed through and thereby can be subjected to several processing steps. The basic technical structure of such straightening machines 4 and in particular of the machine frame 5 provided for this purpose is sufficiently known from the prior art and can have very different forms of implementation.

For straightening a web of material W conveyed via the needle straightening arrangement 1, the first needle straightening wheel 2 is rotatable about a first pivot point DP1 and pivotable about a first pivot axis SA1 and the second needle straightening wheel 3 rotatable about a second pivot point DP2 and pivotable about a second pivot axis SA2 formed.

FIG. 1 shows the Nadelrichträder 2, 3 in the directional position, ie, the first and second Nadelrichtrad 2, 3 include approximately an acute angle with the fabric direction WL. For pivoting the first and second Nadelrichtrades 2, 3 about the respective pivot axis SA1, SA2 an unspecified adjusting mechanism 6 is provided, via which both the adjustment of the Nadelrichträder 2, 3 and an adjustment of the distance of the Nadelrichträder 2, 3 to each present width B of the web W can be adjusted.

According to the in FIG. 2 illustrated embodiment, the web W is fed via an inlet roller 7 a roller mill 8, which, for example, an S-wrap can have. This is followed by a spreader roll arrangement 9 for wrinkle-free feeding of the material web W to the straightening arrangement 1 or its directional wheels 2, 3. After passing through the straightening arrangement 1, the material web W is fed to a sheet straightening roller arrangement 10 arranged on the output side, by means of which minimal sheet rest distortions still contained in the material web W can be corrected before the material web W leaves the straightening machine 4.

The creases supplied by means of the expander roller arrangement 9 web W is detached with their opposite selvages W ', W "is deposited on a Aufnadelstelle N _ON to the needle directional wheels 2, 3 and at a Abnadelstelle N _AB by means of a Abnadelwalze 11 of the needle guide wheels 2, 3 again becomes.

By Aufnadelstelle N _AUF is hereby approximately the one end-side circumferential point of the Nadelrichträder 2, 3 understood, at which the respective pivot axis SA1, SA2 of the Nadelrichträder 2, 3 approximately the front side of the Nadelrichträder 2, 3 intersects. The conveyed material web W is fed there in such a way that it is detected at the point of picking N _AUF by the needles of the respective needle direction wheel 2, 3 and subsequently follows the employed directional wheels 2, 3, whereby a spreading of the material web W to the outside is generated.

In FIG. 3 to illustrate the operation of the needle straightening arrangement 1 and the straightening wheels 2, 3 is a schematic view of the spread profile SP generated by the Nadelrichträder 2, 3 shown on the Nadelrichträdern 2,3 needled web W along the fabric direction WL. Here, the width B of the web W is selectively increased by the engaging in the opposite web edges W ', W "needles of Nadelrichträder 2, 3 when passing through a predetermined peripheral region of the straightening wheels 2, 3, ie the web W spread, and then reduced again.

The spread profile SP thus has a first and second spread profile area SP1, SP2, which run symmetrically to each other. In the first spread profile area SP1, the spread value S of the material web W increases continuously along the frontal circumference of the directional wheels 2, 3, starting from a minimum spread value S _MIN at the point of application N _AUF up to a maximum spread value S _MAX . I'm at it Subsequent second spread profile range SP2 takes the spread value S of the web W along the frontal circumference of the directional wheels 2, 3 from the maximum spread value S _MAX up to the minimum spread value S _MIN decreases again.

The maximum spread value S _{MAX of} the directional wheels 2, 3 is in this case at that front circumferential point of the directional wheels 2, 3, at which the distance from the frontal peripheral point to the respective pivot axis SA1, SA2 is maximum, ie the intersection between a two pivot points SP1, SP2 receiving and perpendicular to the pivot axes SA1, SA2 extending plane E and the respective pivot axis SA1, SA2 opposite end face of the directional wheels 2, 3. This results in the FIG. 3 shown to the maximum spread value S _MAX symmetrical profile of the spreading profile SP.

According to the invention for removing the web W of the straightening wheels 2, 3, the needle roller 11 is pivotally formed about the first and second pivot point DP1, DP2 of the needle straightening wheels 2, 3 receiving pivot axis SA, in such a way that by pivoting the needle roller 11 about the pivot axis SA the Abnadelstelle N _AB along the frontal circumference of the straightening wheels 2, 3 is adjustable. As a result, depending on the properties of the material web W to be processed-such as, for example, its elasticity and / or the strength of the present product warpage-the point of ablation N _{AB of} the needle straightening arrangement 1 can be adjusted individually in order to obtain a significantly improved straightening result. The setting of the Abbestadelstelle N _AB can be carried out either manually or mechanically by means of a control loop.

Under Abnadelstelle N _AB according to the invention that end-side circumferential point of the Nadelrichträder 2, 3 understood at the means of the Abnadelwalze 11, the web W is released from the needles of the respective Nadelrichtrades 2, 3 and thus the of the Nadelrichträder 2, 3 at the respective end circumferential location generated spreading effect is canceled.

The Abnadelstelle N _AB can be adjusted according to the invention in the frontal peripheral region of the Nadelrichträder 2, 3, preferably in the second Spreizungsprofilbereich SP2 according to the in FIG. 3 shown spreading profile SP, the extends from the front-side circumferential point with the maximum spread value S _MAX to the frontal peripheral point with the minimum spread value S _MIN . The minimum spread value S _MIN is approximately at the end face circumferential location opposite the pin point N _AUF , at which the respective pivot axis SA 1, SA 2 of the needle straightening wheels 2, 3 intersects the front peripheral area of the needle straightening wheels 2, 3.

The invention has been described above by means of an embodiment.

LIST OF REFERENCE NUMBERS

1

Needle directing assembly

2

first needle direction wheel

3

second needle direction wheel

4

straightener

5

machine frame

6

adjustment mechanism

7

inlet roller

8th

Walzenzugwerk

9

Expander roller arrangement

10

Arc straightening roller arrangement

11

Abnadelwalze

B

Web width

DP1

first fulcrum

DP2

second pivot

e

level

N _AB

Abnadelstelle

N _UP

Aufnadelstelle

S

spreading value

SA

swivel axis

SA

swivel axis

SA1

first pivot axis

SA2

second pivot axis

S _MAX

maximum spread value

S _MIN

minimum spread value

SP

spreading profile

SP1

first spreading profile area

SP2

second spreading profile area

W

web

W ', W "

Web edges

WL

Running direction

Claims (9)

1. A needle straightening device for correcting the warpage of an advanced material web (W), in particular a textile web comprising at least a first needle straightening wheel (2) designed to be rotatable about a first point of rotation (DP1) and pivotable about a first pivot axis (SA1), and a second needle straightening wheel (3) designed to be rotatable about a second point of rotation (DP2) and pivotable about a second pivot axis (SA2), wherein the advanced material web (W) with the opposite material edges (W', W") is positioned onto the needle straightening wheels (2, 3) at an on-needle point (N_AUF) and is subsequently taken off the needle straightening wheels (2, 3) by means of an off-needle roller (11) at an off-needle point (N_AB), characterised in that the off-needle roller (11) is designed to be pivotable about a pivot axis (SA).
2. The needle straightening device according to claim 1, characterised in that the off-needle point (N_AB) is adjustable by pivoting the off-needle roller (11) about the pivot axis (SA) accommodating the first and second points of rotation (DP1, DP2) of the needle straightening wheels (2, 3).
3. The needle straightening device according to claim 1 or 2, characterised in that the needle straightening wheels (2, 3) are designed so as to generate a spreading profile (SP) with a first and a second spreading profile region (SP1, SP2), wherein the first and second spreading profile regions (SP1, SP2) are approximately symmetrical with respect to one another.
4. The needle straightening device according to claim 3, characterised in that the off-needle point (N_AB) is adjustable in the second spreading profile region (SP2).
5. The needle straightening device according to one of the claims 3 or 4, characterised in that the maximum spread (S_MAX) of the spreading profile (SP) of the straightening wheels (2, 3) occurs at that frontal periphery point of the straightening wheels (2, 3) at which the distance between the frontal periphery point located opposite the pivot axis (SA1, SA2) and the respective pivot axis (SA1, SA2) is a maximum.
6. The needle straightening device according to claim 5, characterised in that in the second spreading profile region (SP2) the spread (S) reduces from the maximum spread (S_MAX) towards the off-needle point (N_AB).
7. A method for adjusting the off-needle point (N_AB) of a needle straightening device (1) having at least two needle straightening wheels (2, 3) for purposes of correcting the warpage of an advanced material web (W), in particular a textile web, in which the advanced material web (W) with the opposite material edges (W', W") is positioned onto the needle straightening wheels (2, 3) at an on-needle point (N_AUF) and is subsequently taken off the needle straightening wheels (2, 3) at an off-needle point (N_AB), characterised in that the off-needle point (N_AB) is adjusted individually for each material web by means of a pivotable off-needle roller (11).
8. The method according to claim 8, characterised in that, for purposes of adjusting the off-needle point (N_AB) the off-needle roller (11), is pivoted along the periphery of the needle straightening wheels (2, 3),
9. The method according to claim 8 or 9, characterised in that the off-needle point (N_AB) is adjusted as a function of the material properties of the material web (W), in particular its elasticity and/or the degree of warpage of the material web (W) and/or the width (B) of the material web (W) at the on-needle point (N_AUF).

Images