EP3722470A1 - Method for pattern-controlled forming of the connection point of an effect thread in tissue - Google Patents

Abstract

In order to ensure in certain cases in a fabric (20) with a zigzag-shaped additional thread (30, 34) that the zigzag thread (30, 34) always assumes its zigzag point (38) in the same position over the length of the fabric, it is proposed that the weft thread ( 24) at certain points in the fabric (20) floating over several adjacent warp threads (21) and the feed needle (32, 36) at least on one side of the zigzag laid laying thread (30, 34) at several or all laying points there in the fabric ( 20) to be introduced or pierced, on which the weft thread (24) floats over several adjacent warp threads (21). The laying thread (30, 34) is positioned on the inside of the zigzag shape.

Description

Technical area

The invention relates to a method for the pattern-controlled formation of the connection points of an effect thread in the fabric.

State of the art

The introduction of fancy threads into a fabric by means of needles, which are stabbed into the open reed from above between the reed stop and the reed and thus bring an effect thread loop into the lower shed - for example from the CH 490 541 A - known for a long time. However, the problem has been shown that the fancy thread needle does not always pierce precisely into the desired warp thread gap, but at most into an adjacent warp thread gap. This can have various reasons, for example the weaving material or the fancy thread needle vibrating, especially at higher weaving speeds, but also due to the different quality of the warp threads.

Presentation of the invention

The object of the invention is to propose a manufacturing method in which the integration of the effect thread is precise in the sense that the aforementioned uncertainty as to whether it will be inserted exactly between two warp threads or just next to it does not matter. The object is achieved by a manufacturing method according to claim 1. The measures of the invention initially result in the fact that the weft thread, which is intended to bind the effect thread, floats over warp threads over a certain length, that is to say is shot over a certain number of warp threads. In the context of this invention, floating is to be understood as the area of the respective weft thread which was introduced over several warp threads without being arranged under one of the warp threads. The length of the float can be specified in a geometric length, for example 1 mm, or a certain number of warp threads, that is for example at least 6. By having the effect needle within the floating Length of the weft thread, the effect thread slips to the respective end of the floating weft thread length after tying in, if necessary only in one of the subsequent cycles. Since the two ends of the floating weft thread lengths are clearly defined by the fabric construction, the connection point of the fancy thread is also precisely defined.

The method of the present invention can be used particularly advantageously when later fraying is to be prevented from the outset by the incorporation of zigzag structures in a fabric that is to be cut into individual fabric webs during the manufacturing process, which is then carried out in a further step with a cold knife or a tool with the same effect. The warp threads, which after cutting lie loosely between the zigzag structure of the laying threads or effect threads and the cutting edge in the fabric, are then simply pulled off. If the fancy thread needle does not always look precisely into the desired gap in the warp thread, it can happen that the warp threads lying next to the zigzag stitch are pierced once by the zigzag stitch, but are exposed another time. As a result, continuous pulling off of the warp threads is not possible or made more difficult and the threads may hang and tear at the places where they are overplaced by the zigzag stitch. The measures of the invention in this advantageous application solve the problem in that the weft threads float over a certain weft thread length between the tie-in points on the edge of two adjacent zigzag lines. The needles that bring the zigzag stitch from above into the shed need - if the measures of the invention are applied - just pierce somewhere within the floating weft thread area. The connection point of the zigzag thread slips automatically to the desired point, at the latest when the subsequent piercing process is carried out.

Another advantageous application of the present invention is made possible by the fact that with two - preferably also zigzag-shaped - effect threads are pierced at certain points in such a way that the two threads touch one another at certain points of the fabric. On the one hand, this can have certain optical effects enable. On the other hand, it is also possible to design the effect threads as conductor threads - namely as metal threads or metal-coated textile threads, and then to ensure very specific, precise points at which the two conductor threads touch and thus have an electrical connection. Of course, this can be done over the length of the fabric at a wide variety of points, possibly only once or twice over the length of the fabric or at every zigzag. Particularly in the case of labels that are provided with electrical elements such as sensors or microprocessors, a specific wiring scheme can be made possible, in particular if more than two conductive effect threads are incorporated. It should be emphasized in this connection that the conductive effect threads do not have to be incorporated in a zigzag shape, but can also be, for example, meandering over long stretches and the float according to the invention is only provided at the point of contact.

In one application of the invention, a textile fabric is produced which has the property of a textile printed circuit board. In this case, the fabric is woven in multiple layers with at least several warp thread layers, one of the warp thread layers in turn having conductive threads, that is to say metal threads or, for example, threads metallized on the surface. For the application described here it is possible that all or only certain warp threads of this warp thread layer have the conductive property. Certain weft threads also have such a conductive property. The fabric is initially designed in such a way that the conductive weft threads and the conductive warp threads do not touch, since they are separated from one another by a non-conductive warp thread layer, for example. The conductive weft threads and the conductive warp threads are connected to one another by the - themselves non-conductive - laying threads. In this application, the position of the connection point is precisely determined by the fact that, as a result of the floating in the fabric, the laying thread again slips exactly to the point at which the electrical connection is provided. When such a point of contact between the conductive weft threads and the conductive warp threads is established in the fabric, the laying thread is guided to the next intended contact point and pierced there. Applications of this design are diverse. On the one hand there are antenna loops in question, which are incorporated into a textile fabric and which - after the application of an RFID chip, for example - form an RFID textile (for example a label). On the other hand, with the aid of this aspect of the invention, a heating textile or an induction loop for charging batteries or for wireless transmission of data can also be formed.

Further advantageous refinements of the loom are described in the dependent claims.

The above-mentioned, as well as the claimed and described in the following exemplary embodiments, elements to be used according to the invention are not subject to any special exceptional conditions in terms of their size, shape, material use and technical conception, so that the selection criteria known in the respective field of application can be used without restriction.

Brief description of the drawings

Figur 1

eine erste Anwendungsform der vorliegenden Erfindung, bei der sich zwei zickzackförmig eingebrachte Legefäden an bestimmen Stellen berührend positionieren,

Figur 2

eine weitere Anwendungsform der vorliegenden Erfindung, bei der bei zwei gegenüberliegenden zickzackförmig eingebrachten Legefäden sichergestellt wird, dass die Endpunkte der Zickzackform jeweils in Kettfadenrichtung auf einer Linie positioniert sind,

Figur 3

eine Ausgestaltung der in Figur 2 dargestellten Anwendung der vorliegenden Erfindung mit zusätzlicher Sicherung der Legefäden an den Zickzackendpunkten nach einem Zerschneiden des Gewebes,

Figur 4

die Bindung für die Ausführung einer alternativen, sehr zuverlässigen Kaltschneidekante,

Figur 5

das Gewebe gemäss Figur 4, wie es sich auf der Webmaschine präsentiert,

Figur 6

ein Anwendungsbeispiel der vorliegenden Erfindung zum Herstellung textiler Leiterflächen,

Figur 7

ein textiles Heizband, hergestellt mittels den Massnahmen der vorliegenden Erfindung, für grössere Heizleistung,

Figur 8

ein textiles Heizband, hergestellt mittels den Massnahmen der vorliegenden Erfindung, für kleinere Heizleistung, und

Figur 9

eine Detaildarstellung zu Figur 7 bzw. 8.

Exemplary embodiments of the loom are described in more detail below with reference to the drawings, which show:

Figure 1

a first form of application of the present invention, in which two laying threads introduced in a zigzag shape are positioned in contact at certain points,

Figure 2

a further form of application of the present invention, in which it is ensured with two opposing zigzag laying threads that the end points of the zigzag shape are each positioned on a line in the warp thread direction,

Figure 3

an embodiment of the in Figure 2 illustrated application of the present invention with additional securing of the laying threads at the zigzag end points after cutting the fabric,

Figure 4

the binding for the execution of an alternative, very reliable cold cutting edge,

Figure 5

the tissue according to Figure 4 as it is presented on the loom,

Figure 6

an application example of the present invention for the production of textile conductor surfaces,

Figure 7

a textile heating tape, produced by means of the measures of the present invention, for greater heating power,

Figure 8

a textile heating tape, produced by means of the measures of the present invention, for lower heating power, and

Figure 9

a detailed representation too Figure 7 or 8.

Ways of Carrying Out the Invention

In Figure 1 a first application of the present invention is shown. In this application, it is intended to ensure that two adjacently introduced, zigzag-shaped additional threads 30 and 34 touch each other at precisely defined points 39. It should be noted here that on the one hand it is difficult or even impossible to have two feed needles pierced in the same position, since they would interfere with one another. But as in Figure 1 is shown, the two feed needles 32 and 36 can basically be introduced anywhere within the float area, as they slide through the zigzag shape and the associated tension to the end point of the float and are firmly positioned there. The effect of mutual contact is thus achieved - by the measures of the invention - in that the two locating needles pierce in the area of the float 37. In a first, simple application, optical effects are achieved with this measure when the laying threads 30, 34 visually stand out from the base fabric (warp and weft). In a further application, however, electrical contact points can also be produced with the measure mentioned, provided the laying threads are, for example, metal threads or metallized textile threads. Textile printed circuit boards can thus be produced, for example by later providing the conductor threads with electronic or electrical components (e.g. sensors or microprocessors).

In Figure 2 A completely different application of the present invention is shown, in which in a fabric that is to be cut into individual fabric webs during the manufacturing process, later fraying is to be prevented from the outset by the incorporation of zigzag structures, which then in a further step with a cold knife or a tool with the same effect. In this case, warp threads, which, after cutting, lie loosely between the zigzag structure of the laying threads or effect threads and the cutting edge in the fabric, are then pulled off. The float prevents the zigzag connection point on the side of the cutting line from always being exactly in the same warp thread gap, and warp threads next to the zigzag stitch being overstitched once by the zigzag stitch, but being exposed another time. The float ensures that the warp threads are continuously pulled off. And it prevents the warp threads from getting caught and torn. The measures of the invention in this advantageous application solve the problem in that the weft threads float over a certain weft thread length between the tie-in points on the edge of two adjacent zigzag lines. The needles that bring the zigzag stitch into the shed from above only pierce somewhere within the floating weft thread area. The connection point of the zigzag thread automatically slides to the desired point, at the latest when the subsequent piercing process is carried out.

In Figure 3 is an improved embodiment accordingly Figure 2 shown, in which the zigzag thread is fixed by means of an additional laying thread 70 so that the weft thread cannot slip out of the zigzag tip after cutting. This would be, for example, when washing the fabric or the cut Fabric tape or with rough or improper treatment. It should be noted that the additional lay thread 70 can certainly be introduced inwardly by one warp thread (with respect to the zigzag shape) and it still ties the lay thread 30, 34 so that the weft thread cannot slip out after cutting.

In the Figures 4 and 5 Another embodiment of the present invention is shown for the purpose of a reliable cold cutting edge, which has been shown to be particularly reliable in practical tests. In this embodiment there is no need to remove excess warp threads. In the Figure 4 the bond is shown in Figure 5 the fabric as it is presented on the loom. During the binding process, floating threads ensure that the zigzag threads always dip precisely into the correct warp gap at the desired cutting line. Since the zigzag threads are under tension, the warp threads they have pierced slip together and form a kind of bundle at the edges. These are so tight that the tie points no longer slip and the edges are therefore fray-proof. By varying the tension of the zigzag threads, the width of the cutting path or the length of the weft thread tails exposed after cold cutting can be adjusted.

Another use case - represented by means of the Figure 6 - also applies to textile fabrics that are intended as textile printed circuit boards. In this application, the fabric is woven in such a way that at least one warp thread layer has conductive threads, that is to say metal threads or, for example, threads metallized on the surface. In the illustrated embodiment, there are three non-insulated conductive threads 80, 82 and 84 in the chain, for example copper strands. A non-isolated guide 86 is placed on the tissue by means of a laying needle and fastened by means of a textile thread 88, which in turn is tied into the tissue. In the area of the contact points between the conductive warp thread 80 and the applied conductor 86, the textile thread 88 pierces exactly into the warp gap to the left and right of the conductive warp thread. This is made possible by the floating of the corresponding weft threads. over 2 to 3 warp threads. The central conductive warp thread 82 should not be with the conductor 86 placed thereon be contacted. The applied conductor 86 therefore lies above the weft threads 24 at the point of intersection, but the conductive warp thread 86 lies under the weft threads. The weft threads 24 between the two conductors 82 and 86 thus form an insulating layer. In order to prevent the applied conductor from slipping into an area in which the conductive warp thread 82 lies above the weft thread, it is loosely tied with the auxiliary thread 88 at the contactless intersection point.

Another application of the present invention relates to the formation of a textile heating band, illustrated by means of Figures 7 to 9 . The power is supplied via two conductive warp threads 80 and 84 in the area of the fabric edges. The heating effect is generated by means of a heating conductor 86, which is laid as a conductive laying thread. The heating conductor 86 connects the two conductive warp threads 80 and 84, which connect the two power supply threads. For greater heating power, the length of the heating conductors 86 is short; for lower heating power, it is lengthened by laying them in a meandering manner. This means that the heating power can be varied as required over the length of the belt. In addition, if a heating conductor 86 breaks, the entire heating system does not fail, but only fails in a small area. The contact point between the conductive warp threads 80 and 84 and the laid heating conductor 86 takes place - as in FIG Figure 9 shown - by alternately piercing the heating conductor 86 into the warp gap to the left and right of the conductive warp thread 80 and 84. This creates an intensive and reliable electrical connection between the conductive warp thread 80 or 84 and the heating conductor 86. Here, too, using the inventive measures, it is ensured by means of floating weft threads that the heating conductor 86 always pierces the correct warp gap.

Reference list

20th

tissue

23

Warp threads

24

Weft

30th

first laying thread

32

first feed needle

34

second laying thread

36

second feed needle

37

Floating area

39

Point of contact

70

additional laying thread to fix the zigzag thread

80

conductive warp thread

82

conductive warp thread

84

conductive warp thread

86

conductive laying thread

88

non-conductive laying thread (auxiliary laying thread)

Claims (14)

Method for producing a fabric by means of a weaving machine, the weaving machine having at least one weft thread insertion device, a reed or an equivalent means, at least one laying device with a feed needle (32, 36) for at least one additional thread (30, 34), with the following steps - Insertion of weft threads (24) into the open warp thread compartment, - Laying the laying thread or threads (30, 34) by means of the feed needle or needles (32, 36), characterized in that - the weft thread is introduced floatingly at certain points in the fabric over several adjacent warp threads, and - at least one laying thread is brought under the floating weft thread at any point between the beginning and the end of the float by means of at least one feed needle and is thereby bound by it, - wherein said laying thread is positioned precisely at the beginning or end of the floating weft thread area as a function of the position of the previous and following tie-in point. Method according to claim 1, characterized in that at least two feed needles each introduce a laying thread into the fabric in a zigzag manner so that these two laying threads are positioned on the opposite sides of the zigzag laying threads at the same point in the fabric. Method according to claim 2, characterized in that in addition to the said laying threads (30, 34) which are introduced in each case in a zigzag shape, a further laying thread (70) is introduced by means of a further feed needle in such a way that it binds the said zigzag thread opposite the respective weft thread at the zigzag end point. Method according to one of Claims 2 or 3, characterized by a further step of cutting the fabric (20) in the withdrawal direction into a plurality of fabric webs (22) by means of a cutting device, the cutting line in the area between the two opposite zigzag points being selected such that said floating weft threads are cut in the area in which they float over the warp threads, preferably in the middle with respect to the float. Method according to Claim 4, characterized in that superfluous warp threads are drawn off in front of or behind the reed. Method according to Claim 4, characterized in that the warp threads are drawn together in the region of the cut edge by a predetermined tension of the laying threads and thereby expose weft thread tails. Method according to Claim 4, characterized in that two opposing zigzag points are incorporated in the same warp gap, thereby making it unnecessary to remove superfluous warp threads. Method according to claim 1, wherein the fabric has the property of a textile printed circuit board, characterized in that at least one warp thread layer has conductive threads (80, 82, 84), preferably metal threads or threads metallized on the surface, and at least one non-insulated guide (86 ) placed on the fabric (20) by means of a laying needle and fastened by means of a textile thread (88), which in turn is tied into the fabric. A method according to claim 8, characterized in that said textile thread (88) makes contact between the conductive warp threads (80, 84) and the uninsulated conductor thread (86). The method according to claim 8 or 9, characterized in that the weft threads (24) represent as an insulating layer between a conductive warp thread (82) and the non-insulated conductor thread (86). A method according to claim 10, characterized in that said textile thread (88) loosely ties the non-insulated conductor thread (86). Method according to claim 1, characterized in that the fabric has the property of a textile heating tape, the current supply being via two conductive warp threads (80, 84) in the area of the fabric edges and the heating effect by means of a heating conductor (86), which is laid as a conductive laying thread is generated, the heating conductor (86) connecting the two conductive warp threads (80, 84). Method according to Claim 12, characterized in that the level of heating power of the conductive laying thread can be freely selected depending on its free length between two connection points with the two conductive warp threads (80, 84). A method according to claim 1, characterized in that at least two feed needles each introduce a laying thread into the fabric in a zigzag manner so that these two laying threads are positioned at the same point in the fabric at least on one side of the zigzag laying threads.

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