EP2573255A1 - Activ draft correction device for correcting the draft of a textile sheet and method - Google Patents

Abstract

The assembly (2) has drive units (12, 13) for actively driving leveling wheels (4, 5) i.e. needle leveling wheels. The drive units are controllable by a control unit independent of each other. The drive units are directly attached to the wheels over gear units (14, 15). The wheels include needles that are outwardly arranged at a distance from front sides of the wheels in a radial direction. The needles are uniformly distributed along a front-sided periphery of the wheels. The wheels are pivotable around pivot axes (SA1, SA2). An independent claim is also included for a method for active deformation correction of a conveyed textile material web.

Description

The invention relates to a straightening device for the active distortion correction of a conveyed web according to the preamble of claim 1 and an associated method according to the preamble of claim. 7

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. Also, asymmetric distortions, i. undulating distortions or so-called S-errors occur.

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. Asymmetrical distortion of a web can be corrected only to a limited extent with such roller-based straightening arrangements.

Alternatively, directional arrangements are known in which the moving textile material web is tensioned at the opposite material web edges via at least two oppositely arranged rotatably mounted directional wheels, in particular needle direction wheels, transversely to the direction of travel of the textile material web. By pivoting the directional wheels about a pivot axis in a predetermined angle to the direction of travel of the textile web and with a predetermined lateral force a laterally outwardly acting transverse stress is introduced into the textile web and thereby causes a spreading of the web. The web edges of the warp-knitted textile web are thus with a defined straightening force to the outside, i. acted upon 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.

It is therefore desirable to have straightening arrangements, in particular needle straightening arrangements, by means of which, in addition to oblique and curved distortions, asymmetrical distortions can also be corrected automatically and, in addition to woven goods webs, knitwear webs can also be directed, with smallest residual distortion tolerances.

Proceeding from this, the present invention seeks to provide a straightening device with active distortion correction and an associated method, which allows a precise, preferably automated distortion correction, especially for very complex and complicated web structures. The object is achieved on the basis of a straightening arrangement 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 straightening arrangement according to the invention is to be seen in that the first and second directional wheels are actively driven. The inventive active drive of the straightening wheels even the slightest skewed distortions can be compensated, which are no longer correctable by passive straightening. In addition, due to the active drive of the straightening wheels, the construction of transverse strains for directional purposes is less important. Advantageously can thus be corrected with irregular straightening with the straightening device according to the invention also transversely elastic webs.

Further advantageous for driving the first directional wheel, a first drive unit and for driving the second directional wheel, a second drive unit is provided, wherein the first and second drive unit are independently controllable, preferably via a control unit. In this case, the first and second drive units are advantageously each assigned directly to the first and second directional wheels to be driven, i. the first and second drive units are connected directly or indirectly to the first and second directional wheels. In one embodiment, the first drive unit via a first gear unit with the first directional wheel and the second drive unit via a second gear unit with the second directional wheel.

Likewise provided by the invention is a method for active distortion correction of a conveyed, in particular textile web by means of a straightening arrangement comprising at least a first straightening wheel and a second straightening wheel. Advantageously, the directional wheels are actively driven, preferably independently.

The first directional wheel is directly or indirectly driven via a first drive unit and the second directional wheel via a second drive unit, for example synchronously or at least briefly to compensate for skewed distortion at a differential speed.

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 Frontansicht einer Richtmaschine umfassend eine erfindungsgemäßen Richtanordnung und

Fig. 2 beispielhaft einen schematischen Querschnitt durch die Richtmaschine gemäß Figur 1.It is expressly understood, however, that the invention should by no means be limited to the examples given. Show it

Fig. 1

exemplified a front view of a straightening machine comprising a straightening arrangement according to the invention and

Fig. 2 by way of example a schematic cross section through the straightening machine according to FIG FIG. 1 ,

In FIG. 1 is shown in a front view of a leveler 1 in a simplified representation, which has a straightening arrangement 2 according to the invention for active distortion correction of a conveyed, in particular textile web W.

FIG. 2 shows by way of example a schematic cross section through the straightening machine 1 and the straightening arrangement 2 according to the invention received therein.

The web W is in this case conveyed in a web direction WL by the leveler 1 and thereby subjected to at least one straightening process. The leveler 1 includes, for example, a schematically in FIG. 2 indicated machine frame 3, in which the straightening arrangement 2 according to the invention and further roller assemblies are added. For example, the machine frame 3 forms a rigid, rectangular frame. The basic technical structure of such straightening machines 1 and in particular of the machine frame 3 provided for this purpose is sufficiently known from the prior art and can have very different forms of implementation.

The straightening arrangement 2 for active distortion correction has at least a first straightening wheel 4 and a second straightening wheel 5, which are preferably designed as needle straightening wheels. Such needle-directional wheels each have from the end faces in the radial direction outwardly projecting needles, which are distributed almost uniformly along the frontal periphery of the needle direction wheels.

For straightening a web of material W conveyed via the straightening arrangement 2, the first straightening wheel 4 is rotatable about a first pivot point DP1 and pivotable about a first pivot axis SA1 and the second straightening wheel 5 rotatable about a second pivot point DP2 and pivotable about a second pivot axis SA2 formed.

FIG. 1 shows the straightening wheels 4, 5 in the directional position, ie, the first and second straightening wheels 4, 5 include approximately an acute angle with the fabric running direction WL. To the Pivoting of the first and second straightening wheels 4, 5 about the respective pivot axis SA1, SA2 an adjusting mechanism 6 not described in more detail is provided, via which both the adjustment of the straightening wheels 4, 5 and the distance of the straightening wheels 4, 5 can be adjusted to each other.

According to the in FIG. 2 illustrated embodiment, the web W is fed via an inlet roller 7 a roller conveyor 8 for conveying de web W, which may have, for example, an S-wrap. This is followed by a spreader roller assembly 9 for wrinkle-free feeding of the web W to the straightening device 2 and their directional wheels 4, 5. After passing through the straightening device 2, the web W is removed via a take-off roller 10 from the straightening wheels 4, 5 and fed to an output side arranged Bogenrichtwalzenanordnung 11 , can be corrected by means of the still contained in the web W minimal Bogenrestverzüge before the web W leaves the leveler 1.

According to the invention, the first and second straightening wheels 4, 5 are actively driven, ie, a first drive unit 12 is provided to drive the first straightening wheel 4 and a second drive unit 13 is provided to drive the second straightening wheel 5, each directly to the first and second straightening wheels 4 to be driven , 5 are assigned. Like from the FIG. 1 it can be seen in a preferred embodiment, the first and second drive unit 12, 13 via a first and second gear unit 14, 15 directly or indirectly connected to the first and second directional wheel 4, 5. These preferably form a structural unit, which is in each case connected to the adjusting mechanism 6. The first and second drive units 12, 13 may be realized, for example, in the form of electric motors, in particular DC or stepper motors, whose speed is adjustable.

The first and second drive unit 12, 13 are independently controllable, and are preferably by means of an evaluation and control unit ASU. In order to obtain an effective correction of, for example, skewed distortions, the first and second drive units 12, 13 are actuated via an evaluation and control routine executed in the evaluation and control unit ASU in such a way that the first and second directional wheels 4, 5 are synchronous or at least short-term Balancing skew with a differential speed to be driven. Advantageously comes through the active Drive the directional wheels 4, 5 the construction of transverse stresses for directional purposes to a lesser importance, since a balance of oblique distortions on the actively driven directional wheels 4, 5 can be realized. Advantageously can thus be corrected with irregular straightening with the straightening arrangement 2 according to the invention also transversely elastic webs W.

For automated active distortion correction also a measuring unit FMC is provided, via which the current delay parameters of the web W are determined on the outlet side and they are transmitted to the connected to the measuring unit FMC evaluation and control unit ASU. In the evaluation and control unit ASU, the evaluation of the current default parameters via the evaluation and control routine, which generates corresponding control signals for controlling the first and second drive unit 12, 13 takes place. The measuring unit FMC can be embodied, for example, in the form of one or more probe units for detecting oblique distortions, bow distortions and / or asymmetrical distortions.

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

directing assembly

3

machine frame

4

first directional wheel

5

second directional wheel

6

adjustment mechanism

7

inlet roller

8th

Walzenzugwerk

9

Expander roller arrangement

10

off roller

11

Arc straightening roller arrangement

12

first drive unit

13

second drive unit

14

first gear unit

15

second gear unit

ASU

control unit

DP1

first fulcrum

DP2

second pivot

FMC

measuring unit

SA1

first pivot axis

SA2

second pivot axis

W

web

WL

Running direction

Claims (10)

Straightening arrangement for the active distortion correction of a conveyed, in particular textile web (W) comprising at least a first straightening wheel (4) and a second straightening wheel (5), characterized in that the first and second straightening wheels (4, 5) are actively driven. A straightening arrangement according to claim 1, characterized in that a first drive unit (12) is provided for driving the first straightening wheel (4) and a second drive unit (13) for driving the second straightening wheel (5). Straightening arrangement according to claim 2, characterized in that the first and second drive unit (12, 13) are independently controllable, preferably via a control unit (ASU). Straightening arrangement according to one of claims 1 to 3, characterized in that the first and second drive unit (12, 13) are each assigned directly to the driven first and second directional wheel (4, 5). Straightening arrangement according to one of claims 1 to 4, characterized in that the first and second drive unit (12, 13) are directly or indirectly connected to the first and second directional wheels (4, 5). Straightening arrangement according to claim 5, characterized in that the first drive unit (12) via a first gear unit (14) with the first directional wheel (4) and the second drive unit (13) via a second gear unit (15) with the second directional wheel (5). are connected. Method for active distortion correction of a conveyed, in particular textile web (W) by means of a straightening arrangement (2) comprising at least a first straightening wheel (4) and a second straightening wheel (5), characterized in that the straightening wheels (4, 5) are actively driven. A method according to claim 7, characterized in that the straightening wheels (4, 5) are driven independently. A method according to claim 7 or 8, characterized in that the first directional wheel (4) via a first drive unit (12) and the second directional wheel (5) via a second drive unit (13) are driven directly or indirectly. Method according to one of claims 7 to 9, characterized in that the first and second directional wheel (4, 5) are driven synchronously or at least temporarily to compensate for skew distortions at a differential speed.

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