EP0752021B1 - Process for producing a belt and belt produced thereby - Google Patents

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

The invention relates to a method for manufacturing a webbing, in particular a seat belt for a motor vehicle in which two wefts in at least a shed be entered.

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

It is known to meet these requirements through a simultaneous Entry of a multifilament and monofilament weft thread to reach. For this purpose, it is also known that the entry of the two different weft yarns by two co-rotating or two counter-rotating Weft needles, e.g. EP 0 021 104 A1, DE 40 09 455 A1, DE 33 45 508 C2, EP 0 579 938 A2.

To overcome the known disadvantages of seat belts e.g. Twisting of the webbing in the fitting, film reel effect when winding in the belt reel, reduce the reel size or to avoid, on the other hand a smooth attached belt strap to the person to be secured becomes a webbing with high lateral stiffness wanted. This is known to be achieved by using monofilament or by using a monofilament and one multifilament weft thread reached.

By using a monofilament or a multifilament and an additional monofilament weft arises with the weft reversal at least on the weft insertion side a so-called saw edge, which is too unpleasant Scratching the skin, clothing and belt deflection leads. Even injuries are on the skin not excluded. Likewise, the deflection fittings be damaged by the saw edge, thereby the belt can be damaged again.

We now know e.g. from EP 0 021 104 A1 seat belt straps with woven hollow edges. It will here a multifilament and a monofilament weft simultaneously with their own weft needle in the Entered in the web subjects in the same direction or in the opposite direction. The multifilament weft binds through the Main weave compartment and through the edge compartment, during the monofilament Weft only entered through the main weaving compartment and is therefore not included in the edge. The woven edge parts are made by pulling the monofilament shot closed to hollow edges.

However, this type of seat belt straps have significant Disadvantages. These include: Edges without full use of tear strength, more significant Cost, unevenly thick edges, thickness the edge to the center different, thereby evoked Abrasion resistance problems.

Seat belt straps without edge parts are also known (e.g. DE 33 45 508 C2). This will also be a multifilament and a monofilament weft at the same time entered, with no separate edges woven will. A middle part and an edge part are formed. The multifilament weft thread runs through the entire Belt width, i.e. middle part and edge part entered, while the monofilament weft only in the middle part of the webbing is entered. Both weft are in a common shed only for the Middle part registered.

This type of seat belt straps also shows considerable Disadvantages. For example, the two fabric edges not uniform, i.e. there are unequal ones Edges in front. The tensile strength can be different Chain incorporation (in the middle part monofilament and multifilament weft, only one multifilament in the margins Weft, which is a change in diameter corresponds to the strength of the shot) between the middle section and edge part fall off. In addition, through the Reversal of shot, i.e. through the weft loops of the monofilament weft, which is known to be harder and brittle between the edge part and the middle part an alley arise. There is also a risk that Squeeze rollers during subsequent processing the weft loops of the monofilament on the multifilament Warp u. Weft threads act to damage them can be. The fabric density between the middle part and the edge parts or the edge part is different, which inevitably leads to an uneven Product density leads.

Seat belt straps without edge parts are also known with weft needles working in opposite directions (e.g. DE 40 09 455 Al). In this process, a monofilament Weft thread entered from one side and on the other knitted on the other side, while the multifilament weft is entered from the other side and on one side is knitted. Both weft threads will be entered in a common shed.

With this method and / or with this webbing the weft loops of the monofilament weft from one side only through part of a stitch covered. However, since a selected guide to Creating the mesh is usually finer to none to obtain the applied stitch row than the one used Weft, this cover is the monofilament Insufficient weft loops. Even with one thicker or additionally selected auxiliary thread or also barrier thread, none can be applied without stitching reliable coverage of the monofilament weft loops be achieved. This means that the training of Saw edges or their avoidance still exist and is not solved.

In other known embodiments, the monofilament only in the middle section with two working in opposite directions Weft needles entered, the weft needle with the multifilament weft thread the middle part and the forms both edge parts and that weft needle with the monofilament weft only in addition to the middle part participates.

In this embodiment, too, they are already in the previous embodiments and procedures Disadvantages not avoided.

The present invention is therefore based on the object a method of weaving a webbing and to create a webbing woven afterwards, in which on the one hand, no saw edges protrude from the belt edges and secondly, no loss in tensile strength arise and similar or the same looking or similarly shaped edges.

Furthermore, it should, if possible, in the subsequent further processing the danger of thread or tissue damage by squeezing through the inner Weft loops can be avoided. A universal Should be used for parts of the above problems also be guaranteed so that tissue with or without Edges and / or edge parts (s) can be woven.

This object is achieved by the characterizing Part of claim 1 mentioned features solved.

Through the weaving process with a total of 3 wefts in the specified way can be used on both sides form the same edges. It also creates Avoided by saw edges, because of this responsible weft, namely the monofilament Weft can be covered accordingly regardless of whether it is up to the outer Warp thread is guided or not. The two are there Weft needles for the opposite weft threads for The multifilament yarn is provided and will cover the entire Tissue width entered. Even if only one of the three weft threads cover only part of the width of the fabric nevertheless, a good utilization is extended the tensile strength achieved.

Another advantage of the method according to the invention is that with the two opposite multifilaments Weft threads edge parts in common binding techniques can be formed.

The weft needle for the third weft, namely the monofilament yarn, can simultaneously over the entire width of the fabric or also be entered over a part. Likewise, the monofilament yarn can only be on one side, e.g. left or right, over the outer warp thread be brought out.

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

According to the invention, each of the three weft threads can be used individually can be linked with all known web systems. Likewise, each of the three wefts can be differentiated into one Web system be tied off.

In an embodiment according to the invention can be provided be that the multifilament and monofilament weft common from one side and the multifilament weft is tied off from the other side alone.

In the weaving method according to the invention can be advantageous Way uses a single-layer binding technique will.

Of course, however, all common ones Binding techniques are used. This means, three times the weft entry is not of the chosen one Binding technique dependent.

According to the invention it can be provided that at least in a shed at least three times two-ply (hin and back) weft threads are provided. You can yourself in a part of a loom at least three times two-way (there and back) wefts.

In an advantageous embodiment of the invention can be provided that the weft loops of the monofilament by knitting the auxiliary thread or through the stitches of the multifilament thread and through the Reverse shot of the co-rotating or moving multifilament Weft are covered.

Another solution to avoid saw edges can be consist in the weft reversal of the monofilament about his own tension through the mesh thighs of the auxiliary thread is drawn into the tissue.

The following is an embodiment of the invention shown in principle on the basis of the drawing.

Fig. 1

die Bindeweise und die Schußeinträge bei einer Grundbindung K 2/2 mit zwei Kettfäden, wobei bei jedem Fachwechsel drei Doppelschüsse eingetragen werden;

Fig. 2

die Abmaschung und die Schußschlaufen auf beiden Gewebeseiten für eine vollständige Abdeckung der Schußschlaufen;

Fig. 3

ein gemeinsames Webfach für ein Weben ohne Kanten und ohne Randteile;

Fig. 4

ein gemeinsames Webfachmittelteil für alle drei Schußnadeln und ein Teilhubfach für Randteile bzw. für eine in besonderer Bindungstechnik gewebte Kante für nur zwei der drei Schußnadeln, wobei die Teilhubfächer beidseitig oder auch nur einseitig angewendet werden können.

It shows:

Fig. 1

the way of tying and the weft entries for a basic weave K 2/2 with two warp threads, with three double wefts being entered with each change of subject;

Fig. 2

the stitching and the weft loops on both sides of the fabric for complete coverage of the weft loops;

Fig. 3

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

Fig. 4

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

1st embodiment without special edges:

With the reference symbol "1" is a common shed designated. A weft needle 2 carries a multifilament Weft 3 from one side through the whole Shed 1. A weft needle 4 carries another multifilament weft 5 coming from the other side through the entire shed.

A third weft needle 6, from the same side comes like the first weft needle 2, wears a monofilament Weft 7, as shown in FIGS. 2 and 3 through the entire Shed 1. The multifilament weft 3 and the monofilament Weft 7, i.e. on the from the entry page opposite side, by an auxiliary thread 8 secured. The multifilament weft 5 is on the opposite Side secured by an auxiliary thread 9.

Of course, the arrangements of the weft needles and the entry times are given only as an example. You basically play within the scope of the invention a subordinate role. So it is e.g. equally possible the weft needle 6 with the monofilament weft 7 between or under the weft needles 2 and 4 with the to arrange multifilament wefts 3 and 5. Likewise it is also possible to use the weft 7 with the monofilament Shot not - as shown - from the left, but from right in the shed 1.

In the context of the invention, it is also possible to use the mesh of multifilament wefts 3 and 5 with all common ones To carry out weaving systems, taking the loops the monofilament weft 7 preferably with a guide should be done. The weakening of the multifilament weft 3 and the monofilament weft 7 is done in a simple manner together with the already mentioned auxiliary thread 8.

The multifilament weft threads 3 and 5 should preferably be used half the thread count compared to a single entry exhibit; i.e. if, for example, with only one weft needle a 1100 dtex weft yarn is used, so are in the inventive method or the belt produced afterwards the half subtleties, namely two weft yarns with 550 dtex each used. The Fineness of the simply inserted monofilament weft 7 can stay with the original choice.

Because of the common, double counter-rotating and triple weft entry creates a webbing through which is the task in this embodiment is solved as follows:

The wefts 3, 5 and 7 are over the entire Belt width, i.e. entered over each warp thread 10, being a uniform tissue density with the same Weft thread insert on the belt width ensures one same incorporation of the warp threads 10 and thus one optimal strength utilization is guaranteed.

Due to the interception and meshing of the multifilament Weft thread 3 and the monofilament weft thread 7 the other side by an auxiliary thread 8 Monofil 12 weft loops and Multifil weft loops pulled by the own shot tension in the belt, that none of these weft loops come from the fabric edge can leak. This means, that is from Auxiliary thread 8 stitch 15 formed on the outside of the fabric edge. Basically, however, such a meshing is known to all needles of weaving machines.

On the one hand, however, the weft reversal 11 of the hard and brittle monofilament weft 7 saw edges surrender. Simultaneously with the weft entry of the multifilament weft 3 and the monofilament weft 7 is now from the other side of the multifilament weft entered in the opposite direction and also simultaneously with the other side on one side using an auxiliary thread 9 knitted. Because the guide 9 formed stitch 14 but only the other multifilament weft 5 intercepts and secures, is now on the one hand also only the stitch 14 on the fabric edge Outside. The weft loops 11 of the monofilament, also called weft heads are through the stitch 14 and by reversing the shot of the co-rotating or co-rotating multifilament weft thread 3 completely and permanently covered, which now saw edges on both sides be avoided.

By selecting the thickness of the two auxiliary threads 8 and 9, as well as a selection of the web systems used the edge failure can be individually designed.

Through the outside stitch 14 on one side and the outside stitch 15 on the other side will also have the same edge on both Pages achieved.

In a further embodiment, the weaving system can be used in this way be chosen that the same weaving systems for the edges or different web systems application Find.

2nd embodiment with two special edges or Edge parts according to FIG. 4:

In this embodiment, the carries a weft needle 2 the multifilament weft 3 also through the entire shed 1 while the third Weft needle 6 the monofilament weft 7 only by one predefined area of e.g. Partial lift 16 wearing. The simultaneously entered weft threads 3 and 7 can, depending on the version, on the other side together and can also be caught and knitted individually. At the same time carries the other or second weft needle 4 with the multifilament weft 5 also through the entire shed 1 and is on one Page through, e.g. an auxiliary thread 9, secured. As Follow the partial lift, which is the entry of the third Weft needle 6 with the monofilament weft on one If the desired width is limited, the monofilaments are sufficient Weft threads 7 not on the fabric edge. As with the first embodiment is also in this Embodiment the arrangement of the weft needles only defined as an example. The same applies to the entry directions and the meshes with or without Auxiliary threads.

In this embodiment, the task set solved as follows:

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

The symmetrical edges are through opposing weft entries from the multifilament Shot of one side 3 and the multifilament shot given the other side 5. The weft loops of the monofilament weft 11 lie according to a predefined Width of the weft entry within the fabric, so that no saw edges can arise because the Monofilament 7 does not occur at the edge of the fabric.

The total of 3 x 2-ply weft threads, (see Fig. 1), lie parallel in the fabric, so that the loss of goods is quieter and is more uniform than with a fabric 2 x 2 ply parallel weft threads, in which one shot is considerably thicker than the other shot. Should replace the simple edge parts from optical Reasons or other reasons hollow edges or round edges will be used as above. The Edge parts are made using an appropriate binding technique chosen. It can all for this Application known binding techniques applied will. The edge versions can be made in material type, Material thickness and material density selected individually will.

Claims (12)

1. A process for producing a belt, in particular a seat belt for a motor vehicle, in which two weft threads are inserted into at least one shed, whereby the two weft threads (3,5) are inserted over the entire fabric width, whereby one weft thread (3) is inserted from the one side and the other weft thread (5) is simultaneously inserted from the other side,
   characterised in that in addition at least a third weft thread (7) binds with warp threads (10) over at least a predetermined part of the fabric width.
2. A process according to claim 1,
   characterised in that the two weft needles (2,4) of the two weft threads (3,5) running in opposite directions insert multifilament yarn over the entire fabric width.
3. A process according to claim 1 or 2,
   characterised in that the weft needle (6) for the third weft thread (7) inserts a monofilament yarn simultaneously over the entire fabric width.
4. A process according to claim 1 or 2,
   characterised in that the weft needle (6) for the third weft thread (7) inserts a monofilament yarn simultaneously over only a part of the fabric width.
5. A process according to claim 4,
   characterised in that the monofilament yarn is passed out over the outer warp thread (10) only on one side.
6. A process according to one of claims 1 to 5,
   characterised in that the weft threads (3,5,7) passed out over the outer warp thread (10) are bonded, secured or fixed with themselves or each side with at least one auxiliary thread (8,9).
7. A process according to one of claims 1 to 6,
   characterised in that each of the three weft threads (3,5,7) can be individually bonded with different weaving systems.
8. A process according to one of claims 1 to 7,
   characterised in that the multifilament and monofilament weft thread (3,7) is inserted jointly from the one side and the multifilament weft thread (5) separately from the other side.
9. A process according to one of claims 1 to 8,
   characterised in that a single-ply weaving technique is used.
10. A process according to one of claims 1 to 9,
    characterised in that two-ply (to and fro) weft threads are provided at least in one shed at least three times.
11. A process according to one of claims 1 to 10,
    characterised in that the weft loops (11) of the monofilament thread (7) are covered by loops of the auxiliary thread or threads or by the loops of the multifilament thread and by the weft reversal of the synchronous or accompanying multifilament weft thread.
12. A process according to one of claims 6 to 10,
    characterised in that the weft reversal (11) of the monofilament thread (7) is drawn into the fabric via its own tension through the loop shank (15) of the auxiliary thread (8).

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