JP2005530051A - Manufacturing method of woven belt strap - Google Patents

Abstract

The present invention relates to a method for manufacturing a woven belt strap (1), in particular a vehicle seat belt. The present invention provides that the weft yarns (8, 9) alternate between one belt while at least the first both weft yarns (11, 11 ', 15, 15') remain on each side entrance side without weaving. Inserted from the side and from the other side of the belt strap, and the weft yarn (14, 14 ') that loops the weft yarn at the weft exit side is the weft yarn without being woven into the weft yarn Characterized by being drawn into a woven fabric until woven by.

Description

  The present invention relates to a method for manufacturing a woven belt strap, in particular a vehicle safety belt.

  It is known to use solid weft yarns, in particular monofilament yarns, in the production of transverse hard belt straps, in particular vehicle seat belts, by thin fabric needle looms. This hard weft yarn has the disadvantage of protruding from the belt by forming a hard sawtooth woven fabric edge at the edge where the weft returns.

  Various attempts have been made to overcome the negative aspects of hard weft materials.

  European Patent Application No. 0021104A (EP0021104A) discloses a two-needle technology with a knitted course at the weft exit end that solves the problem by including a rounded edge in the woven fabric.

  German Patent Application No. 3345508C2 (DE 3345508C2) discloses a two-needle technique with a knitting course at the weft exit end including a 2: 2 edge.

  PCT / EP / 48285 discloses a one-needle technique with two knitting needles where the crochet edge is formed at the weft exit end and the weft entrance end.

  German Patent Application No. 4009455 (DE4005555) by the same applicant as the present invention discloses a method of knitting a single fiber weft belt strap on a thin fabric needle loom having two opposing weft needles. The weft is pulled alternately from both side ends of the belt strap.

  All of these known techniques have the following disadvantages. That is, although the belt strap edges are manufactured to look substantially the same, they have the disadvantage that because of the textile system they have different results.

  When these belt straps are used, especially in technical applications such as automotive seat belts, the belt straps wear when traveling on pulleys (buckles, deflectors, etc.) and the edges are greatly curved. , Tend to deform. Due to differences in textile technology in the manufacture of the right and left edges of the belt strap, this deformation is not uniform and can result in a belt strap that is bent like a saber. When the belt strap is twisted in this way, it can no longer be wound properly, and as a vehicle occupant's seat belt, it is not only uncomfortable for the occupant but also dangerous (unrestrained).

  An ideal belt strap should have the following performance: The edge should be soft when hard weft is used. Both edges of the woven fabric should be 100% identical not only in appearance but technically. Even in dense weft sets, yarn entanglement should not occur. The weaving method needs to be simple and friendly to the operator.

  Accordingly, it is an object of the present invention to provide a method for manufacturing a woven belt strap, in particular an automobile seat belt, which avoids or at least greatly reduces the disadvantages of the prior art.

  This object is claimed in claim 1 by using a belt strap loom with weft needles operating alternately in the opposite direction, which has the effect that the belt strap is soft and both edges have the same shape. This method is achieved. An ideal edge is produced.

The procedure of the method of the present invention is as follows, for example.
First pick (withdrawal):
A weft thread 9 is drawn (picked) from the left to the right with a weft thread needle 5 at the shed formed by the warp thread 2, and a right knit needle 6 is used with a sewn (tuck) thread (not shown). Loop the weft 9 on the right edge of the belt strap (this case is shown). After returning the weft needle to the left, the weft thread drawn (picked) by the lead 3 is attached to the already woven fabric 1. When changing the shed, the left weft needle and the right knit needle remain housed for one revolution of the loom.
Second pick:
The weft thread 8 is pulled in by the right weft thread needle 4 coming from the right side at the shed, and the weft thread 8 is looped by using the sewing thread from the left knit needle 7. After returning the weft needle to the right end position, the weft drawn by the lead 3 is attached. The right weft thread needle and the left knit needle remain housed in this position for one revolution of the loom.
Third pick:
A third pick that is a repetition of the first pick is executed.
4th pick:
A fourth pick that is a repetition of the second pick is executed.

  When using a hard weft yarn material that is particularly hard and monofilament, a relatively thick stitching thread is used at both ends to cause a hard reversal of the weft yarn.

  Furthermore, in this technique, every other pick is crocheted at the end of the belt strap, so that a very high density weft set can be achieved (a high density weft set with increased anti-wear).

No additional stitching thread or lock thread to prevent wire fraying is necessary for this weaving method. This is because the weft entry and crochet are present at each edge of the belt strap, so that the fabric is stable even when the thread is easily worn or worn. If additional wire protection is desired, the following procedure has advantages:
To prevent wire transmission, an additional bracket with a thread hole is secured to each tucker, and the lock thread pulled through the thread hole moves above the picker over the tucker, and the sewing thread that advances from the bottom acts on the knit needle. Taken and sewn thread is crocheted. When the tucker is lowered, the advance knit needle takes the lock thread coming from above, entangles the stitching thread, and as a result rubs each other, the stitching thread is sewn without being drawn into the ear Prevent pull-up of the yarn.

  Furthermore, the procedure according to the present invention for further improving the cover of the pick reversing part is as follows. As is apparent from FIG. 2, the first two warp threads 11, 15, 11 ', 15' remain knitted on each retracting side. That is, they are always overstitched or understitched with each pick, resulting in the pick inversion being located further away from the end of the belt strap. In other words, as the number of yarns that are not knitted increases, more pick reversal sections move in the direction of the middle 12 of the fabric. Here, a case where six yarns are not knitted is shown.

  Warp threads 11, 11 ', 13 and 13' which are not sewn into the woven fabric are included at each weft exit end by sewn threads 14, 14 'which are entangled by the weft thread drawn into the fabric (soft). These sewing threads are applied to the portions without picks. This is achieved by increasing the positive sewing thread supply and correspondingly decreasing the positive weft supply. This is because the edge region weft set is half of the remaining fabric. To compensate for this situation, the following is done. In the region of the edge, a woven fabric that is shorter than the rest of the fabric is selected, for example K2: 2 at the back and L1: 1 at the edge. Furthermore, it may prove advantageous to use a thicker yarn for a normal half-length weft.

  The intention of the present invention is that even when using a hard weft material, a belt strap fabric on a thin fabric needle loom, characterized by a woven fabric that is 100% identical not only in appearance but also in its right and left edges, in particular, The goal is to manufacture car seat belts. In the prior art, this was possible only with a belt strap manufactured on a shuttle.

A particularly advantageous feature of a belt strap having the same edge, particularly in an automobile seat belt apparatus that is exposed to frequent movements in the automobile, is that of the belt strap, which is generally the same edge. The side edges do not deform (saber-like curves). Vehicle belt straps that avoid sagging, i.e., belt straps that fail to provide protection from the danger of the passengers being pushed forward with great risk of injury in the event of a collision, are automatically wound. Eliminate problems

The invention will be briefly described below with reference to the drawings.
It is the schematic which simplified the structure of the belt strap loom of this invention which looked at from upper direction. FIG. 5 is a very simplified diagram showing how the weft reversal is included in a woven fabric using a knitting needle (the belt strap is not scaled correctly).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt belt 2 already woven 2 Warp thread 3 Lead 4 Right side weft needle 5 Left side weft thread needle 6 Right side knit needle 7 Left side knit needle 8 Right side weft thread 9 Left weft thread 10 and 10 'Pull-in side parts 11 and 11 ′ Second warp thread 12 Belt strap intermediate portions 13 and 13 ′ Third and fourth weft threads 14 and 14 ′ Sewing thread 15 and 15 ′ First warp thread

Claims (4)

A method of manufacturing a woven fabric, in particular an occupant safety belt, wherein weft yarns are alternately picked from one side end of the woven fabric and then from the other side end, and at least a first two weft yarns at each pick side end Step to leave outside the woven fabric,
Pulling the pick yarn sufficiently at the pick exit end so that the weft yarn remaining outside the woven fabric by the pick is included in the woven fabric by the loop of the tack yarn;
A process for producing a woven fabric comprising: A method of forming a tubular edge according to claim 1, comprising:
(A) Use at least four edge yarns at each side end, do not weave to the draw-in side, and pull with the tack yarn upon return of the weft needle to the basic warp yarn, from the next pick to the pick exit side To be interwoven in
(B) using lace yarns running in the warp direction on each side and positioned respectively in front of the first warp yarn and outside the first weft yarn, said lace yarn acting like an edge yarn, but at least A step that results in an edge fabric formed by a tack yarn that is lifted in two draws and pulled approximately from the pick to the base fabric;
The manufacturing method according to claim 1, comprising: (A) An additional bracket with a thread hole is secured to each tucker to prevent wire transmission, and the lock thread pulled through the hole moves onto the tucker above the pick and proceeds from below. A step that is crochet and first taken by the knitting needle,
(B) Lowering the tacker, the advance knit needle takes the lock yarn coming from above, twists the tack yarn, and as a result the lock yarn is not drawn into the edge of the fabric and prevents any pulling of the tack yarn, Intertwined steps,
The manufacturing method according to claim 1 or 2, characterized by comprising:   4. The process according to claim 1, wherein hard yarns, in particular monofilament yarns, are used as weft yarns, soft yarns, in particular multifilament yarns, are used as tack yarns.

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