EP3372714B1 - Structured circular woven fabric - Google Patents

Description

The invention disclosed below relates to

Within the scope of the disclosure of the invention, an internal warp thread is defined as that warp thread which is arranged on the side of the weft thread facing the longitudinal axis of the circular fabric. An external warp thread is therefore defined as that warp thread that is arranged on the side of the weft thread that faces away from the longitudinal axis of the circular fabric.

An interior and an exterior of the circular fabric are defined by the fabric of a circular fabric made from weft threads and warp threads. The inside warp is on the inside of the weft, while the outside warp is on the outside of the weft.

In circular fabrics of the prior art, the number of warps forming a first group and the number of warps forming a second group are constant over the span of the circular woven fabric. An example of a circular fabric according to the prior art is that the groups of the warp threads lying on the outside are formed by one warp thread and the groups of the warp threads lying on the inside are formed by two warp threads. This system is maintained over the entire length of the hose with circular fabrics according to the prior art.

The international patent application with the application number PCT/EP2016/069685 (published under the number WO2017/029390 A1 ) discloses a device for circular weaving, which allows the raising of the warp threads and the lowering of the warp threads independently of the position and/or movement of the weft thread and the weaving shuttle or shuttle pulling the weft thread between the warp threads.
EP0120337 , US5799707 , EP0264881 and US5843542 disclose fabrics producible using flat weaving technology.

The invention disclosed here sets itself the task of providing a method for the production of a round fabric which, due to its structure, has partially different technical and also optical properties than circular fabric according to the prior art.

A rounding of the weft thread is to be understood as meaning the length of the weft thread that extends along the shape of the circular fabric.

All the warp threads can be arranged on the inside of the weft thread. In this case, the number of warp threads arranged on the outside of the weft thread can be zero.

At least one warp thread can be arranged on the inside of the weft thread. The number of warp threads arranged on the outside can be n-1.

The invention disclosed herein is based on International Patent Application Serial No. referred to above PCT/EP2016/069685 on. The raising and lowering of the warp threads, which is decoupled from the movement of the weft thread, allows the number of warp threads in a group of warp threads to be specified. The person skilled in the art recognizes that the number of warp threads in the groups can be used to define the technical properties of the round fabric. On the one hand, the surface of the circular fabric can be designed from a technical and visual point of view. It can be specified, for example, by the cross-sectional shape or the thickness development of the circular fabric along the extent of the weft thread.

A circular weaving device - as in PCT/EP2016/069685 discloses - comprises a number of warp threads, which warp threads can be brought into engagement with the weft thread by raising or lowering independently of the movement of the weft thread. This also makes it possible, independently of a different number of warp threads in the groups, to vary the distances between the warp threads.

Furthermore, the surface structure of the hose can be specified by the number of warp threads in the groups. The invention disclosed here is in no way limited to the possibility of aesthetic design of the surface, which can be regarded as a side effect to be achieved. Due to the possibility of designing the surface structure of the circular fabric, special technical properties can be assigned to the surface structure, such as high abrasion resistance due to a large number of warp threads on the surface.

The second group of warp threads is arranged following the first group, viewed in the direction of the length of the weft thread. A first group and a second group may be adjacent to each other, i.e. a second group immediately follows a first group.

The different number of internal warps of the first group and the number of internal warps of the second group can follow a mathematical series of internal warps. Likewise or in addition to this, the different number of outer warp threads of the first group and the number of outer warp threads of the second group can follow a mathematical series of outer warp threads.

The invention further relates to a method for producing a structured round fabric, which round fabric is produced by means of a circular weaving process, comprising at least one weft thread and a number n of warp threads, the outer warp threads and the inner warp threads forming groups of warp threads, which groups are formed by the between Warp threads guided weft thread are separated.

Circular fabrics according to the prior art comprise a sequence of one to two raised warp threads and one to two lowered warp threads that does not change over the extension of the at least one weft thread. Prior art circular fabrics never comprise groups of more than three warp yarns, since it is not possible with the existing art to raise or lower more than two warp yarns.

A further inventive embodiment of the invention disclosed here is that the number of warp threads in a group is n≥3 and/or the sum of the number of warp threads in a first group of raised warp threads and the number of warp threads in a first group of lowered warp threads is n>4.

Circular fabrics of this type are characterized by particularly good abrasion resistance on the side on which the three warp threads are arranged.

A high abrasion resistance can also be achieved if the number of those weft threads on the outside of a curve that form a group of weft threads is n≥2.

The person skilled in the art is also able to combine the approaches discussed above with one another.

figure 1 shows a cross-sectional image of an embodiment of a round fabric that can be produced according to the method according to the invention.

figure 2 and figure 3 show a cross-sectional image of an embodiment of a circular fabric not produced by the method according to the invention.

Figure 4 to Figure 6 show detailed cross-sectional views of embodiments of circular fabric that can be produced using the method according to the invention.

In the figure 7 contained table is related to figure 6 .

the Figures 1 to 7 relate to the initially mentioned first and/or second embodiment of the method for producing the round fabric.

figure 8 shows a longitudinal section of a layer of an embodiment of the circular fabric not produced by the method according to the invention. figure 8 illustrates the third and fourth embodiment mentioned at the outset.

The exemplary embodiments shown in the figures show possible variants, it being noted at this point that the invention is not limited to the specifically illustrated variants of the same, but rather that various combinations of the individual variants are possible with one another and these possible variations are based on the teaching on technical action due to the present invention lies within the ability of a person skilled in the art working in this technical field.

The scope of protection is determined by the claims. However, the description and drawings should be used to interpret the claims.

• 1
• Schussfaden
• 2
• außen liegender Kettfaden
• 3
• innen liegender Kettfaden
• 4
• Längsachse
• 5
• Rundgewebe
• 10
• erste Gruppe gehobener Kettfäden
• 11
• zweite Gruppe gehobener Kettfäden
• 12
• dritte Gruppe gehobener Kettfäden
• 20
• erste Gruppe gesenkter Kettfäden
• 21
• zweite Gruppe gesenkter Kettfäden
• 22
• dritte Gruppe gesenkter Kettfäden

In the figures, the following elements are identified by the preceding reference symbols:

• 1
• weft thread
• 2
• external warp thread
• 3
• internal warp thread
• 4
• longitudinal axis
• 5
• circular fabric
• 10
• first group of raised warps
• 11
• second group of raised warps
• 12
• third group of raised warps
• 20
• first group of lowered warp threads
• 21
• second group of lowered warp threads
• 22
• third group of lowered warp threads

figure 1 shows a sectional view of various embodiments of circular fabric 5 according to the invention, comprising a weft thread 1 and ten warp threads 2,3. figure 2 and figure 3 show sectional views of various embodiments of circular fabric 5 not produced by the method according to the invention. The cutting plane lies at right angles to the longitudinal axis 4 of the circular fabric 5. The weft thread 1 runs essentially parallel to the plane of the image; the warp threads 2, 3 extend at right angles to the image plane.

In the Figure 1, 2 and 3 Embodiments of the round fabric 5 shown in simplified form are produced by means of circular weaving processes. A weft thread 1 is this to the longitudinal axis 4 of the circular fabric 5, the warp threads 2, 3 out crossing what in the simplified representation of Figures 1-3 is represented by the arrows at the ends of the weft thread 1.

In the figure 1 The illustrated embodiment of circular fabric 5 according to the invention comprises a total of ten warp threads 2 , 3 , which warp threads 2 , 3 in turn are divided into warp threads 2 lying on the outside of weft thread 1 and warp threads 3 lying on the inside. The distances between the warp threads 2, 3 are at in figure 1 illustrated embodiment not the same.

The outer warp threads 2 lying adjacent to one another form groups of outer warp threads 10, 11, for reasons of clarity in figure 1 only a first group of raised warp threads 10 and a second group of raised warp threads 11 are registered.

The first group of outside warp threads 10 comprises two outside warp threads 2 , while the second group of outside warp threads 11 comprises one warp thread 2 . The number of warp threads 2 in these groups 10, 11 is different and is between zero and the total number of warp threads, namely ten.

The first group of internal warp threads 20 includes two internal warp threads 3 , while the second group of internal warp threads 21 includes three internal warp threads 3 . The number of warp threads 3 in these groups 20, 21 is also different and is between zero and the total number of warp threads, namely ten.

figure 1 12 also shows the special case that the first groups 10,20 are adjacent to the second groups 11,21.

In the figure 2 shown embodiment of the non-inventive circular fabric 5 comprises only internal warp threads 3. For reasons of clarity are in figure 2 only a few warp threads 3 are provided with a reference number as an example. The number of internal warp threads thus corresponds to the number of warp threads, namely ten. In this position, the weft thread 1 is guided outside the warp threads 3 lying on the inside.

figure 3 shows a sectional view of a further embodiment of a circular fabric 5 not according to the invention, which comprises only the warp thread 2 lying on the outside. In this position, the weft thread 1 is guided within the warp threads 2 lying on the outside. In the figure 3 The drawn position of the weft thread 1 does not form the cross section of the round fabric 5; this is done by the preceding and/or following shift.

figure 4 shows a detailed view of a sectional view of a circular fabric 5 represented in a simplified manner by a straight line, the sectional plane running at a right angle to the axis of longitudinal extension of the circular fabric 5 . The circular fabric 5 produced by means of circular weaving technology comprises a weft thread 1, which is essentially parallel to the plane of the figure figure 4 runs, and warp threads 2.3. In the warp threads 2.3 is between internal warp threads 3, in which the warp thread 3 within the Weft thread 1 is arranged, and external warp threads 2, in which the warp thread 2 is arranged outside of the weft thread 1, distinguished.

The warp threads 2 on the outside and the warp threads 3 on the inside each form groups of warp threads 20, 21, 22 on the inside or groups of warp threads 10, 11, 12 on the outside. In figure 4 the groups of outside warp threads 10,11,12 and the groups of inside warp threads 20,21,22 are visually represented by dashed circles.

The first group of external warp threads 10 is spatially separated from the second group of external warp threads 11 by a partial area of weft thread 1, which partial area of weft thread 1 is guided outside of the first group of internal warp threads 20, which first group 20 in an area between the first group 10 and second group 11 is arranged.

The second group of external warp threads 11 is separated from the third group of internal warp threads 12 by a portion of weft thread 1 , which portion of weft thread 1 is guided above the second group of internal warp threads 21 .

Furthermore, the first group of internal warp threads 20 is guided by the second group of internal warp threads 21 through the portion of weft thread 1 that is guided within the second group of external warp threads 11 . In a manner analogous to this, the second group of internal warp threads 21 is guided by the third group of internal warp threads 22 through the portion of weft thread 1 that is guided within the third group of external warp threads 12 .

The first group of external warp threads 10 includes three warp threads 2, the second group of external warp threads 11 includes two warp threads 2 and the third group of external warp threads 12 includes a warp thread 2. The groups of external warp threads 10, 11, 12 include thus in each case a different number of warp threads 2. The person skilled in the art will also recognize that the groups of internal warp threads 20, 21, 22 each have a different number of warp threads 3.

This in figure 4 (Partially in the detailed view) shown circular fabric 5 is further characterized in that the first group of outer warp threads 10 to the adjacent second group of outer warp threads 11 (and vice versa) has a different number of warp threads. This feature can also be seen in the second group of external warp threads 11 and the third group of external warp threads 12 .

In the same way, the adjacent groups of internal warp threads 20, 21, 22 each have a different number of warp threads 3.

In addition, the first group of warp threads 10 lying on the outside comprises a different number of warp threads 2, namely three warp threads, than the adjacent first group of warp threads 20 lying on the inside, namely one warp thread. This system can also be seen in the following second and third groups.

In the figure 4 The groups of outer warp threads 10, 11, 12 shown follow a mathematical sequence, namely one-two-three. The groups of internal warp threads 20, 21, 22 also follow a mathematical sequence, namely three-two-one. The mathematical sequence of the groups of the outside warp threads 10, 11, 12 is thus the reverse of the mathematical sequence of the groups of the inside warp threads 20, 21, 22.

figure 5 shows another, to which in figure 4 illustrated, similar embodiment of the round fabric according to the invention 5.

The difference to the in figure 4 The embodiment illustrated lies in the way in which the first groups of warp threads 10, 20 are separated from the second groups of warp threads 11, 21. The first group of external warp threads 10 is separated from the second group of external warp threads 11 by weft thread 1. In particular, this spatial separation takes place through that partial area of the weft thread 1 which is guided above the first group of the warp threads 20 lying on the inside and the second group of the warp threads 21 lying on the outside.

The first group of internal warp threads 20 is further separated by weft thread 1 from the second group of internal warp threads 21 .

The adjacent first and second groups 10, 11, 20, 21, 22 in turn comprise a different number of warp threads 2, 3.

figure 6 shows the in figure 4 shown detailed view of an embodiment of a circular fabric 5 according to the invention, which was supplemented by a further weft thread 1 '. All information in figure 6 , which relate to the position of the warp threads 2, 3 such as a raised or lowered warp thread, and the resulting division of the warp threads into groups 10, 11, 20, 21, relate to the position of the respective warp thread 2, 3 in relation to the first weft thread 1.

With the help of figure 6 it is illustrated that a further weft thread 1' does not have to follow the first weft thread 1 under any circumstances. In this way, the surface of the circular fabric 5 can be designed from a technical point of view as well as from an optical point of view. Furthermore, it is possible to specify the cross-sectional shape of the round fabric 5 .

figure 7 includes a table that shows the systematics for the production of the in figure 6 shown tissue shows. The warp threads are entered in the first line with a consecutive numbering from 1 to 12. The second line and the third line indicate whether the insertion of the first weft thread 1 or the second weft thread 1′ involves an external warp thread 2 or an internal warp thread 3.

figure 8 shows a longitudinal section of a possible embodiment of a circular fabric not produced according to the method according to the invention, which, like the circular fabrics shown above, is produced by circular weaving processes.

The circular fabric includes a weft thread 1, which is guided in curves around the longitudinal axis 4 of the circular fabric and thus in figure 8 can be seen in cross section. In figure 8 For reasons of clarity, only some of the cross sections of the weft thread 1 are marked with a reference number.

In figure 8 is also one of the n warp threads 2, 3 located. Depending on whether the warp thread is guided inside or outside of the weft thread 1 , the partial areas are identified as the internal warp thread 2 or the external warp thread 3 .

Groups of weft threads 30, 31 lying on the outside and groups of weft threads 40, 41 lying on the inside are formed by the warp thread extending between the cross-sections of weft thread 1 lying on the outside and cross-sections of weft thread 1 lying on the inside.

The number of outside weft threads 1 of a curve, which form a first group of outside weft threads 30, and the number of outside weft threads 1 of a curve, which form a second group of outside weft threads 31, is different.

The number of internal weft threads 1 of a curve, which form a first group of internal weft threads 40, and the number of external weft threads 1 of a curve, which form a second group of internal weft threads 41, are different.

Claims (1)

1. A method of preparing a structured round fabric using a circular weaving method,

   wherein along a round of a weft yarn (1), a number of n warp yarn (2, 3) are brought into an outer position and/or an inner position with respect to said weft yarn (1), decoupled from the movement of said weft yarn (1),

   wherein the warp yarns (2) arranged in the outer position and the warp yarns (3) arranged in the inner position each respectively form groups (10, 11, 12, 20, 21, 22),

   which groups (10, 11, 12, 20, 21, 22) are separated by the weft yarn (1) extending between the warp yarns (2, 3), or

   which groups (10, 11, 12, 20, 21, 22) are arranged at a distance to one another along the weft yarn (1),

   characterised in that

   a different number of warp yarns (3) in the groups of the inner warp yarns (20, 21, 22) or a different number of warp yarns (2) in the groups of the outer warp yarns (10, 11, 12) are arranged along a round and along further rounds of the weft yarn (1) to change the cross-section.

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