EP0752021A1

EP0752021A1 - Process for producing a belt and belt produced thereby

Info

Publication number: EP0752021A1
Application number: EP95911302A
Authority: EP
Inventors: Roland Brielmann
Original assignee: Carl Stahl GmbH and Co KG
Current assignee: Carl Stahl GmbH and Co KG
Priority date: 1994-03-23
Filing date: 1995-03-07
Publication date: 1997-01-08
Anticipated expiration: 2015-03-07
Also published as: US5769130A; EP0752021B1; AU1893295A; DE4409980A1; WO1995025836A1; JPH09511285A; ES2117412T3; RU2130519C1; DE59502262D1; ATE166399T1

Abstract

PCT No. PCT/EP95/00829 Sec. 371 Date Aug. 27, 1996 Sec. 102(e) Date Aug. 27, 1996 PCT Filed Mar. 7, 1995 PCT Pub. No. WO95/25836 PCT Pub. Date Sep. 28, 1995A process for producing a safety belt for use in a motor vehicle comprises the insertion of two yarns into a least one shed. Two weft yarns are inserted over the entire width of the fabric, with one inserted on one side of the fabric and the other on the other side of the fabric at the same time. In addition, a third weft yarn binds over a part of the fabric with warp yarns.

Description

Method of manufacturing a webbing and webbing made thereafter

The invention relates to a method for producing a belt webbing, in particular a seat belt for a motor vehicle, in which two weft threads are inserted into at least one shed.

The invention relates in particular to a seat belt webbing for a motor vehicle with special requirements, in particular to the transverse stiffness. Belt straps of this type are generally single-layer woven belt straps, which are produced with or without special edges.

It is known to achieve these requirements by simultaneously inserting a multifilament and monofilament weft thread. For this purpose, it is also known that the entry of the two different weft yarns can be carried out by two weft needles running in the same direction or by two counter-rotating, e.g. EP 0 021 104 AI, DE 40 09 455 AI, DE 33 45 508 C2, EP 0 579 938 A2.

To overcome the known disadvantages of seat belts e.g. Twisting of the belt strap in the fitting, film reel effect when winding up in the belt reel, reducing or avoiding the winding size, but on the other hand a smooth-fitting belt strap is required of the person to be secured, a belt strap with high transverse stiffness is desired. This is known to be achieved by using monofilament or by using a monofilament and a multifilament weft thread.

By using a monofilament or else a multifilament and an additional monofilament weft thread When the weft is reversed, a so-called saw edge arises, at least on the weft insertion side, which leads to uncomfortable scratching on the skin, clothing and belt deflection. Even injuries on. the skin are not excluded. Likewise, the deflection fittings can be damaged by the saw edge, whereby the belt can be damaged again.

We now know e.g. from EP 0 021 104 AI safety belt straps with woven hollow edges. In this case, a multifilament and a monofilament weft thread are inserted into the shed at the same time, each with its own weft needle in the same direction or in the opposite direction. The multifilament weft binds through the main weaving compartment and through the edge compartment, while the monofilament weft thread is only inserted through the main weaving compartment and is therefore not contained in the edge. The woven edge parts are closed by pulling the monofilament section into hollow edges.

However, this type of seat belt straps have considerable disadvantages. These are, inter alia: Edges without full use of the tear strength, considerable cost, unevenly thick edges, thickness of the edge differing from the center, thus causing abrasion resistance problems.

Safety belt straps without edge parts are also known (for example DE 33 45 508 C2). A multifilament and a monofilament weft thread are also inserted at the same time, whereby no separate edges are woven. A middle part and an edge part are formed. The multifilament weft thread is inserted through the entire belt width, i.e. middle part and edge part, while the monofilament weft thread only in the middle part of the webbing is entered. Both weft threads are entered in a common shed only for the middle part.

This type of seat belt straps also has considerable disadvantages. For example, the two tissue edges are not uniform, i.e. there are uneven edges. The tensile strength can drop due to different warp incorporation (in the middle part monofilament and multifilament weft thread, in the edge parts only a multifilament weft thread, which corresponds to a change in the diameter of the weft thickness) between the middle part and the edge part. In addition, by reversing the shot, i.e. the loop loops of the monofilament shot, which are known to be harder and more brittle, may create an alley between the edge and middle section. There is also the risk that pinch rollers in the subsequent further processing thus weft loops of the monofilament on the multifilament warp and. Weft threads have the effect that they can be damaged. The fabric density between the middle part and the edge parts or the edge part is different, which inevitably leads to an uneven fabric density.

Also known are seat belt straps without edge parts with opposing weft needles (e.g. DE 40 09 455 AI). In this method, a monofilament weft thread is inserted from one side and knitted on the other side, while the multifilament weft thread is inserted from the other side and knitted on one side. Both weft threads are entered in a common shed.

With this method and / or with this webbing that the weft loops of the monofilament weft thread are only covered on one side by the part of a stitch. However, since a selected auxiliary thread for creating the stitch is generally finer in order not to obtain a knitting course than the inserted weft thread, this coverage of the monofilament weft loops is insufficient. Even with a thicker or additionally selected auxiliary thread or also blocking thread, reliable coverage of the monofilament weft loops cannot be achieved without stitch application. This means that the formation of saw edges or their avoidance is still present and has not been solved.

In other known embodiments, the monofilament is only inserted in the middle part with two weft needles working in opposite directions, the weft needle with the multifilament weft thread forming the middle part and the two edge parts and that weft needle with the monofilament weft thread only additionally forming the middle part.

In this embodiment, too, the disadvantages already mentioned in the previous embodiments and method forms are not avoided.

The present invention is therefore based on the object of providing a method for weaving a webbing and a webbing woven thereafter, in which, on the one hand, no sawing edges emerge on the belt edges and, on the other hand, there are no losses in tear strength and the like or similarly looking or similarly shaped edges.

Furthermore, if possible in the following the risk of damage to the thread or fabric by squeezing rollers through the internal weft loops can be avoided. A universal use for parts of the above problems should also be ensured so that fabrics with or without edges and / or edge parts can be woven.

This object is achieved according to the invention by the features mentioned in the characterizing part of claim 1.

Through the weaving process with a total of 3 weft threads in the specified manner, the same edges can be formed on both sides. In addition, the formation of saw edges is avoided, because the weft responsible for this, namely the monofilament weft, can be covered accordingly, regardless of whether it is guided to the outer warp thread or not. The two weft needles are provided for the opposing weft threads for the multifilament yarn and are entered over the entire width of the fabric. Even if only one of the three weft threads extends over only part of the fabric width, a good utilization of the tear strength is nevertheless achieved.

Another advantage of the method according to the invention is that edge parts can be formed with the two counter-rotating multi-filament weft threads in conventional weaving techniques.

The weft needle for the third weft thread, namely the monofilament yarn, can be inserted simultaneously over the entire width of the fabric or also over a part. Likewise, the monofilament yarn can only be te, e.g. left or right, are led out over the outer warp thread.

In an advantageous embodiment of the invention it can be provided that the weft threads led out via the outer warp threads with themselves or with at least one auxiliary thread per side. be tied, held or fixed.

According to the invention, each of the three weft threads can be tied individually with all known weaving systems. Likewise, each of the three weft threads can be tied in a differentiated weaving system.

In an embodiment according to the invention it can be provided that the multifilament and monofilament weft thread is tied together on one side and the multifilament weft thread is tied alone on the other side.

A single-layer weaving technique can advantageously be used in the weaving method according to the invention.

Of course, all common binding techniques can be used. This means that three times the weft insertion does not depend on the binding technique chosen.

According to the invention it can be provided that at least three times two-ply (back and forth) weft threads are provided in a shed. At least three times two-way (there and back) weft threads can also be found in a part of the one shed. In an advantageous embodiment of the invention, it can be provided that the weft loops of the monofilament are covered by the stitching of the auxiliary thread or by the stitch of the multifilament thread and by the weft reversal of the multifilament weft running in the same or moving direction.

Another solution to avoid sawing edges can be that the weft reversal of the monofilament is drawn into the tissue through the mesh legs of the auxiliary thread via its own tension.

An exemplary embodiment of the invention is shown in principle with reference to the drawing.

It shows:

1 shows the manner of tying and the weft entries in the case of a basic weave K 2/2 with two warp threads, with three double wefts being entered with each change of subject;

2 the stitching and the weft loops on both fabric sides for a complete covering of the weft loops;

3 shows a common shed for weaving without edges and without edge parts;

4 shows a common loom center part for all three weft needles and a partial lifting compartment for edge parts or for an edge woven in a special weave for only two of the three weft needles, the partial lifting compartments being used on both sides or only on one side can be.

1st embodiment without special edges:

The reference symbol "l" denotes a common shed. A weft needle 2 carries a multifilament weft thread 3 from one side through the entire shed 1. A weft needle 4 carries a further multifilament weft thread 5 coming from the other side through the entire shed.

A third weft needle 6, which comes from the same side as the first weft needle 2, carries a monofilament weft 7, according to FIGS. 2 and 3, through the entire shed 1. The multifilament weft 3 and the monofilament weft 7 are, i.e. secured on the side facing away from the insertion side by an auxiliary thread 8. The multifilament weft thread 5 is secured on the opposite side by an auxiliary thread 9.

The arrangements of the weft needles and the entry times are of course only given as an example. They basically play a subordinate role in the context of the invention. So it is e.g. it is also possible to arrange the weft needle 6 with the monofilament weft thread 7 between or under the weft needles 2 and 4 with the multifilament weft threads 3 and 5. It is also possible to insert the weft 7 with the monofilament weft into the shed 1 not from the left, as shown, but from the right.

Within the scope of the invention it is also possible to carry out the stitching of the multifilament weft threads 3 and 5 with all common weaving systems. The monofilament weft 7 should preferably be knitted with an auxiliary thread. The multifilament weft thread 3 and the monofilament weft thread 7 are stitched off in a simple manner together with the auxiliary thread 8 already mentioned.

The multifilament weft threads 3 and 5 should preferably have half the thread thickness compared to a single entry; i.e. if, for example, a 1100 dtex weft yarn is used with only one weft needle, half the fineness, namely two weft yarns each with 550 dtex, are used in the method according to the invention or in the belt produced thereafter. The fineness of the simply entered monofilament weft thread 7 can remain with the original choice.

Due to the common, double counter-rotating and triple weft insertion, a belt strap is created, by means of which the set object is achieved as follows in this exemplary embodiment:

The weft threads 3, 5 and 7 are entered over the entire belt width, that is to say over each warp thread 10, a uniform fabric density with the same weft thread insert ensuring the belt width, an equal incorporation of the warp threads 10 and thus an optimal strength utilization being guaranteed.

Due to the interception and the stitching of the multifunctional weft thread 3 and the monofilament weft thread 7 on the other side by means of an auxiliary thread 8, the weft loops monofilament 12 and weft loops multifilament are pulled into the belt by the own weft tension so that none of these weft loops come out of the fabric edge can leak. This means, that is from Auxiliary thread 8 stitch 15 formed on the outside of the fabric edge. In principle, however, such a weaving is known for all needles of the weaving machines.

On the one hand, however, the weft reversal 11 of the hard and brittle monofilament weft 7 would result in saw edges. Simultaneously with the weft insertion of the multifilament weft thread 3 and the monofilament weft thread 7, the multifilament weft thread is now inserted in the opposite direction from the other side and also knitted simultaneously with the other side on the one side by means of an auxiliary thread 9. However, since the stitch 14 formed by the auxiliary thread 9 only intercepts and secures the other multifilament weft thread 5, only the stitch 14 on the fabric edge is now also on the outside. The weft loops 11 of the monofilament, also called weft heads, are completely and permanently covered by the stitch 14 and by the weft reversal of the multifilament weft thread 3 running in unison or in the same direction, whereby sawing edges are now avoided on both sides.

By selecting the thickness of the two auxiliary threads 8 and 9 and by selecting the weaving systems used, the edge failure can be individually designed.

The outer stitch 14 on one side and the outer stitch 15 on the other side also achieve the same edge on both sides.

In a further embodiment, the weaving system can be selected such that the same weaving systems or different weaving systems are used for the edges. find application.

2. Embodiment with two special edges or edge parts according to FIG. 4:

In this embodiment, the one weft needle 2 carries the multifilament weft thread 3 also through the entire shed 1, while at the same time the third weft needle 6 carries the monofilament weft thread 7 only through a predefined area of e.g. Partial lifting compartment 16 carries. The weft threads 3 and 7 entered at the same time, depending on the design, can be caught and stitched together and also individually on the other side. At the same time, the other or second weft needle 4 with the multifilament weft thread 5 also carries through the entire shed 1 and is passed through on one side, e.g. an auxiliary thread 9, secured. As a result of the partial lifting compartment, which limits the entry of the third weft needle 6 with the monofilament weft thread to a desired width, the monofilament weft threads 74 do not reach the fabric edge. As in the first exemplary embodiment, the arrangement of the weft needles is only defined as an example in this exemplary embodiment. The same applies to the directions of entry and the loops with or without auxiliary threads.

In this embodiment, the task is solved as follows:

The weft threads 3 and 5 are inserted over the entire belt width, that is to say over each warp thread 10, so that a better use of strength is achieved than with separately woven hollow edges. The predefined width for the monofilament weft thread can be up to to a maximum of one warp thread on the edge of the total width.

The symmetrically formed edges are given by the opposing weft entries from the multi-filament weft on one side 3 and the multifilament weft on the other side 5. The weft loops of the monofilament weft thread 11 lie within the fabric after a predefined width of the weft insertion, so that no sawing edges can arise since the monofilament weft 7 does not come to the fabric edge.

The total of 3 x 2-thread weft threads (see FIG. 1) lie parallel in the fabric, so that the loss of goods is quieter and more uniform than with a fabric with 2 x 2-thread weft threads lying parallel, in which a weft is considerably thicker than that another shot. If hollow edges or round edges are to be used instead of the simple edge parts for optical reasons or for other reasons, the procedure is as above. The edge parts are selected in a corresponding binding technique. All binding techniques known for this purpose can be used. The edge designs can be individually selected in material type, material thickness and material density.

Claims

Patent claims

1. A method for producing a belt webbing, in particular a seat belt for a motor vehicle, in which two weft threads are inserted into at least one shed, characterized in that the two weft threads (3, 5) are inserted over the entire fabric width, a weft thread (3) from one side and the other weft thread (5) from the other side being introduced simultaneously, with at least a third weft thread (7) additionally tying with warp threads (10) over at least a predefined part of the fabric width.

2. The method according to claim 1, so that the two weft needles (2, 4) of the two opposing weft threads (3, 5) enter multifilament yarn over the entire width of the fabric.

3. The method of claim 1 or 2, so that the weft needle (6) for the third weft thread (7) simultaneously enters a monofilament yarn over the entire width of the fabric.

4. The method according to claim 1 or 2, characterized in that the weft needle (6) for the third weft thread (7) enters a monofilament yarn simultaneously over only part of the fabric width.

5. The method of claim 4, d a d u r c h g e k e n n z e i c h n e t that the monofilament yarn is only led out on one side over the outer warp thread (10).

6. The method according to any one of claims 1 to 5, characterized in that the weft threads (3, 5, 7) leading out over the outer warp thread (10) with themselves or per side with at least one auxiliary thread (8,9) tied, held or fixed.

7. The method according to any one of claims 1 to 6, so that each of the three weft threads (3, 5, 7) can be individually tied with different weaving systems.

8. The method according to any one of claims 1 to 7, so that the multifilament and monofilament weft thread (3, 7) is entered jointly from one side and the multifilament weft thread (5) is entered from the other side alone.

9. The method according to any one of claims 1 to 8, d a d u r c h g e k e n n z e i c h n e t that a single-layer binding technique is used.

10. The method according to any one of claims 1 to 9, characterized in that at least three times two-ply (there and back) weft threads are provided in a shed.

11. The method according to any one of claims 1 to 10, characterized in that the weft loops (11) of the monofilament (7) by knitting the or the auxiliary thread or by the stitches of the multifilament thread and by reversing the weft of the co-rotating or multi-filament weft be covered.

12. The method according to any one of claims 6 to 10, so that the weft reversal (11) of the monofilament (7) via its own tension through the stitch legs (15) of the auxiliary thread (8) is drawn into the fabric.

13. Belt webbing with at least two weft threads, so that it is produced with a third weft thread according to one of the methods mentioned in claims 1 to 13.