JPS6363652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for weaving a belt with a single layer center section and a tubular edge section.

The main use for belts made in this way is automotive safety (seat) belts. If a needle belt loom is used, a row of stitches must be formed and closed together to form a tube at one edge. According to the conventional method, the stitch row is disposed at the end of the central section and the loops of the stitch row are drawn into the central section, so that the stitch row is effectively
They merge into the center and disappear.

In a known example, a weft thread insertion needle (hereinafter referred to as a "weft thread needle")
It is called. ) must enter the same shed (space between the upper and lower warps) formed in the center twice in succession. This is because the reversal of the shed (the switching of the upper and lower warps) takes place only at the edges during this time. For each shuttle, the edges are woven in the first stroke, and in the next shuttle only one of the two outer warp threads is twisted by the weft threads, and then the edges are woven within the center. and is adapted to be pulled back to form a tubular edge.

In the present invention, the weft thread insertion speed is increased, in particular doubled, and this is achieved in such a way that the stitch row virtually disappears within the belt.

Now, the present invention provides a method for weaving a belt having a single-layer central part and two tubular edges on a needle-type belt loom equipped with knitting needles, and the method includes the following steps. . That is, it is a method of weaving a belt having a single-layer central portion and tubular portions on both sides using a needle-type belt loom equipped with knitting needles, the method comprising: (a) weaving both tubular edges into a single-layer edge shape; (b) forming stitches with said knitting needles at the outer end of one edge; and (c) inserting two weft threads with two weft needles simultaneously on each shuttle. (d) A common shed for both weft insertion needles is formed by at least two outer end warp threads on the insertion side so that one weft thread can be locked at the outer end of the edge. (e) forming upper and lower sheds so that the edges can be woven between the center part and the two warp threads, one of which is used to weave the two outer end warp threads; receiving a first weft needle for guiding a first weft thread that is twisted only with at least one of the sheds, and receiving a second weft needle for guiding a second weft thread forming an edge in the other shed; (f) drawing one loop with said knitting needle through at least one loop of said weft yarn to the outside of one of said edges to form a stitch; (g) Feeds the book's weft reliably, and also
(h) the first weft needle is configured to feed the first weft thread longer than the second weft thread by at least the width of both edges; closing the single layer edge, i.e. the edge on the weft needle insertion side, at the end of insertion of the weft needle and closing the second single layer edge during return of the weft needle to form a double tubular edge; (i) Closing said second single ply edge draws the stitch previously formed on its outer edge to the edge of the center section and the tension of the weft thread causes a loop to be drawn from this stitch into the center section. That is, it was made to be extracted.

Two weft needles were used instead of one, and both were inserted at the same time for each shuttle. For this reason,
It is now possible to double the weft insertion speed for the same warp speed. In other words, the length of the belt woven per unit time has doubled.

The method for manufacturing the stitch rows is as follows. That is, one of the two weft yarns weaves the edge, and the other one picks up one of the two outer warp yarns when constructing the tubular edge.

The knitting needles may guide the loops (ie, the loops of one of the weft threads or of the locking thread) through the other weft thread or the loops of both weft threads to form a stitch. Pick up only one of the two outer warp threads (twist)
When a tensile force is applied to the second weft, the edges close to form a tubular edge. Then, the loops of the stitch row formed on one edge were drawn into the fabric in the center.

In addition, it is necessary to take into consideration that the lengths of both weft threads are different. This is because only one of the weft threads constitutes both tubular edges and must therefore be longer than the other weft thread, which only constitutes the central part.

Furthermore, when using only one weft thread needle, two stitches had to be formed by two consecutive shuttle strikes. That is, in the first shuttle, both edges and the central part of the single layer are woven, and a stitch is formed with the weft thread at the right outer edge to prevent the weft thread from being pulled out. In the second shuttle, only the center part was woven, and stitches were formed by going around the single layer edges on both sides to prevent the weft from being pulled out.

In the present invention, one stitch is formed by double threading with two weft needles, and two
The weft threads of the book are fixed to the outer warp threads and are prevented from being pulled out from the outer single layer edge. As a result, the stitching of the weft threads at the edges is reduced to half that of the conventional method, and the weft threads can be drawn into the fabric more easily and completely. Belts woven in this manner have improved protection against stitch abrasion.

In the weaving method disclosed in German Publication No. 2161013, two weft needles are used, and a stitch row is constructed from one weft thread and one auxiliary thread at one edge of the fabric. ing. but,
In this case, no tubular edges are formed at all,
Instead, both weft threads are pulled into the edges of the fabric. Therefore, this publication describes how to construct a tubular edge by simultaneous insertion of both weft thread needles, i.e. when both weft thread needles have to perform two completely different functions. There is no mention of whether the work will proceed.

In contrast, one embodiment of the invention allows the use of weft yarns of different thicknesses. Therefore, by skillfully combining a plurality of weft materials with different thicknesses, it is possible to weave a high-quality belt with a thickness different from that of ordinary commercially available belts. The thickness and transverse stiffness of this belt can be arbitrarily selected, and since two weft yarns of different thicknesses are used, the weft density does not need to be changed.

In another embodiment of the invention, a monofilament yarn can be used for the first weft yarn. This first weft serves to draw the outer edge of the single layer edge into the center to form a tubular edge, but does not serve to create an edge weave. Single-filament yarns are stiffer than the commonly used multi-filament yarns. Therefore, a belt woven with a monofilament weft yarn has high lateral rigidity, which is very advantageous for winding operations in automatic safety belt winding devices for automobiles.

On the other hand, when the monofilament yarn protrudes from the edge of the belt, it causes a large amount of friction against the clothing or body of the safety belt wearer. To avoid this, single-filament yarns should only be used to construct the belt center and draw in the single-layer edges woven with multi-filament yarns.

If a relatively stiff single-filament yarn is used for only one side of the weft thread, the number of weft threads woven per centimeter of belt length will be lower than when two multi-filament threads of the same thickness are used as the weft thread. can be made smaller. As a result, production speed can be increased.

In principle, various methods of forming the stitch rows are possible. For example, two weft threads can be knitted together or one weft thread can be knitted together with a catch thread. In either case, the stitch row can be protected by a separate barrier thread to prevent it from being pulled out.

If a locking thread is used and the locking thread is thinner than the weft thread, the thickness of the stitch row can be reduced even further.

In one embodiment of the invention, the locking thread and the barrier thread can be fed by the same threader,
As a result, the manufacturing cost of the loom can be reduced.

The present invention also relates to a needle threader for a needle-type belt loom that implements the method of the above embodiment.
A single threader with a bifurcated protrusion allows the locking thread and barrier thread to be fed together.

Some embodiments of the invention will now be described with reference to the accompanying drawings.

FIG. 1 shows a cross-sectional view of a strip belt with a left-hand tubular edge 21, a right-hand tubular edge 22 and a single-layer central section 24. In FIG. Weft needle is arrow 26
direction, and pull it out in the opposite direction to arrow 26. Both tubular edges 21, 22 are initially woven in a single layer to form edges 21' and 22'. Edge 2
A row of stitches 28' is formed at the free end of 2'. When the edges 21', 22' are closed by pulling the weft thread, tubular edges 21, 22 are formed. As a result, the stitch row 28' is moved to position 28'' where it is embedded within the fabric of the strip belt.

Figures 2 and 3 are schematic diagrams showing the process of weaving in which two weft threads and one barrier thread are knitted at the same time. Edge 21' without forming an edge
and 22' are shown in an expanded single layer state.

The central portion 24 and both edge portions 21' shown in FIG.
The 22' warp threads are shown in fewer numbers than would normally be used. In addition, in FIG. 4, the edge 22'
Only two warp threads (labeled 1a and 1b) are shown.

Only one shuttle is required to construct the single-layer central part 24, and this only one can be transposed for each shuttle stroke in a known manner to effect the twill weaving. The pattern in FIG. 5 shows this situation for axis numbers 5-12. However, weaving in the center can also be done using a double shed.

For the warp yarns at the two outer ends of both edges 21' and 22', two shafts, namely shaft numbers 1 and 2, are used with large shuttles whose positions are changed to create linen weave or plain weave. Form. The first weft needle 30 or the first
The weft thread 31 is inserted into this shed. This first weft thread 31 has an edge 22' that is connected to the outer warp thread 1a.
and 2a in an alternating manner.

In order to form the fabric on both edges, the lower shed 32
b is formed (see Figure 2). For each shuttle stroke, the warp halves 4a of both edges are pulled down by the associated twilling, while the other halves 3a remain in a neutral or intermediate position. A second weft thread 35 is passed through the lower shed 32b with the second weft thread needle 34.

Both weft needles 30, 34 are inserted at the same time. The central portion 24 is twilled with both weft threads 31 and 35 for each shuttle. Both edges are woven in a linen weave with a second weft 35, while at each shuttle, the first weft 31 is twisted with one of the two outer end warp threads of the edges.

To construct a stitch row, the knitting needles 37, which are movably mounted on the needle loom, are first moved below the first weft needle 30 and between this weft needle 30 and the first weft thread 31 from the fabric. Pass. The knitting needle 37 is then moved in the vertical direction above the second weft needle 34 in such a way that the second weft thread 35 emerging from the fabric inserts itself into the open head of the knitting needle 37. Although not shown in the figures, it is also possible to guide the second weft thread 35 into the open head of the knitting needle using a threader of known type.

Next, all three needles 30, 34 and 37 are
When withdrawn to the position shown, the knitting needle 37 pulls out the loop 35' of the second weft thread 35 through the loop 31' of the first weft thread 31 and also pulls out the loop 35' remaining from the time of the previous shuttle. is removed to form the stitch 28. This loop 35'' is constructed from the second weft thread 35.

Additionally, barrier yarn 41 may be woven into stitch row 28'. As shown in FIG. 3, the barrier yarn 41 intersects only the second weft yarn 35 at the knitting needle 37.

By applying a tensile force to the first weft thread 31, the edges 21' and 22' are closed to form a tubular edge, which is not shown in FIG. The left side edge 21 closes to the right each time the first weft needle 30 is inserted, and the right side edge 22 closes to the left when the first weft needle 30 is withdrawn. In this final step, the stitch row 28 is drawn to the right end of the central part 24 and each time a loop of the second weft thread 35 is drawn by the first weft thread 31 from the stitch row into the single-ply central part 24.

The knitting needles 37 are mounted on a shaft disposed in the weft direction and below the fabric to be woven so as to be pivotable about the shaft, and are configured to draw an arcuate trajectory with a small curvature.

Although FIG. 3 shows the loop of the second weft thread 35 passed through the loop of the first weft thread 31, other methods may alternatively be used to achieve the same function with both weft threads. That is, the procedure may be reversed, that is, the loop of the first weft thread 31 may be passed through the loop of the second weft thread 35.

FIG. 6 is a diagram illustrating a method of constructing a stitch row using locking thread 51. This figure shows two outer warp threads 1a and 2a, shaft numbers 1 and 2, a plurality of weft threads that have already been inserted, and two weft thread needles 3.
Two weft threads 3 just inserted at 0,34
1,35 are shown. Apart from the special features described below, the above description also applies to this embodiment.

A threader 53 is used to thread the locking thread 51 and the barrier thread 41 together (see FIG. 7). The threader 53 is mounted at a location 54 in FIG. 7 and can be pivoted about a shaft extending in the direction of the weft thread. FIG. 7 shows the threader 53 in its upper operating position. The threader 53 is equipped with an arm which terminates at its right end in two projections 58, 60 and has an eyelet 62, 63 at its free end, respectively. The small hole 62 is for feeding the locking thread 51, and the small hole 63 is for feeding the barrier thread 41. One protrusion 5
8 is curved to form an arc of approximately 180°, and the other protrusion 60 is a straight line that forms the chord of one of the protrusions 58, and has a length that is approximately half the length of this chord. It is only expanding.

FIG. 7 shows the second operating position of the threader 53 and the two weft needles 30 and 34. As can be seen, in this position the threader 53 surrounds both weft needles 30, 34. As can be seen from FIG. 6, the main threading device 53 passes the locking thread 51 from below and the barrier thread 41 from above. As a result, the loop 5 of the locking thread 51
1', on the one hand, between both weft needles 30 and 34;
On the other hand, it will be drawn by the knitting needle 37 between the two weft threads 31, 35 from the fabric. Loop 51″ of locking thread 51 and barrier thread 41
The loop 41'' remains on the knitting needle from the previous shuttle.The barrier yarn 41 itself also hangs on the knitting needle 37.
, both loops 41'' and 5
1'' is removed and a new stitch 65 is formed.

Next, No. 8a, which shows the left and right edges of another example,
The process of forming the tubular edge will be described in detail based on FIG. 8b and FIGS. 9a and 9b.

In FIG. 8a, the first weft thread 31a passes above the warp threads 1b, 2b...nb on the left side edge 21a and is pulled out from between the outer warp threads 1b and 2b, and the second weft thread 35a The warp threads 1b, 2b, .

Furthermore, although not shown, the first weft thread 3
1a is a warp yarn 1b by a first weft needle 30.
It passes around the left side edge 21a and is guided to the center part 24a. The second weft thread 35a is the second weft thread 35a.
The warp yarns 1b are passed around by the weft needle 34 and guided to the center portion 24a through a shed formed between the warp yarns 1b, 2b, . . . , nb on the left side edge 21a.

In FIG. 8b, the first weft thread 31a passes above the warp threads 1c, 2c, . ing. The second weft yarn 35a is guided out of the warp yarn 1c through the shed formed between the warp yarns 1c, 2c, ... nc on the right side edge 22a, forms a loop, and passes through the same shed again in the center. 24a. A locking thread 51a is drawn into these loops by a knitting needle 37.

In Figure 8a, when the first weft yarn 31a is drawn into the central part 24a, the warp yarns 1b are drawn towards the central part 24a, forming the left edge 21a into a tubular shape as shown in Figure 9a. Similarly, in FIG. 8b, when the first weft yarn 31a is drawn into the central portion 24a, the warp yarns 1c are drawn toward the central portion 24a, and the right edge 22a is formed into a tubular shape as shown in FIG. 9b.

In both embodiments, the inlet length of the second weft thread 35 must be greater than that of the first weft thread 31. While the first weft thread 31 essentially constitutes only the single-layer central part 24, the second weft thread 35 must also constitute the fabric of both edge parts 21', 22'. No. Furthermore, in the embodiments of FIGS. 2 and 4, the second weft thread 35 must be made even longer.
This is because, in addition to the above-mentioned conditions, the second weft thread 35 in this case must be capable of forming the stitch row 28' and also forming a loop drawn from this stitch row into the central part of the single layer. It is from.

As can be seen from the above description, the prerequisites for producing a complete belt are the reliable feeding of both weft threads and the ability to supply different weft thread lengths for each shuttle. Note that since a known device that can satisfy this condition can be used, it is not considered necessary to describe it in this specification.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a belt-like belt woven by the method of the present invention. FIGS. 2 and 3 are schematic diagrams showing the steps of a sewing method in which two weft threads and one barrier thread are knitted at the same time. Figure 4 shows
It is a figure which shows the specific example of sewing and weaving of this invention performed in the state where weft thread loops are pulled apart. FIG. 5 is a diagram showing various patterns regarding the center and edge portions of this belt-like belt. FIG. 6 is a modified example of the process corresponding to FIG. 4, and shows the step of first making a stitch row from the locking thread and the barrier yarn, and then passing the weft thread loop through this stitch row. FIG. 7 is a side view of the locking thread and barrier thread threader used in the process of FIG. 6 in an upward operating position.
Figures 8a, 8b, 9a and 9b are edge cross-sectional views of further embodiments. 1a, 1b, 1c...outer warp threads, 21, 22
... Tubular edge, 21', 21a, 22', 22a... Edge, 24... Center, 28... Stitch, 28'... Stitch row, 30... First weft needle, 31, 31a
...first weft, 32a...upper shed, 32b...
Lower shed, 34...Second weft needle, 35, 35
a... Second weft thread, 37... Knitting needle, 41... Barrier thread, 51, 51a... Locking thread, 53... Threader.

Claims (1)

[Claims] 1. A method for weaving a belt having a single-layer central portion and tubular edges on both sides using a needle-type belt loom equipped with knitting needles, comprising: (a) weaving both tubular edges into single-layer edges; (b) forming stitches with said knitting needles at the outer end of one edge; and (c) weaving two weft threads with two weft needles for each shuttle. (d) A common shed for both weft needles is formed by the two warp threads at the outer ends so that one weft thread can be locked at the outer end of the edge. (e) Upper and lower sheds are formed so that the two edges can be woven between the center part and the warp threads, and one of the sheds allows at least one of the two outer end warp threads to be weaved. A second weft needle receives a first weft needle that guides a first weft thread that twists only with one, and a second weft needle that guides a second weft thread that forms an edge in the other shed.
(f) a loop is drawn through at least one loop of said weft yarn with said knitting needle to the outside of one of said edges to form a stitch; (g) Make sure to feed the two weft threads mentioned above, and
(h) the first weft needle is configured to feed the first weft thread longer than the first weft thread by at least the width of both edges; closing the single layer edge, i.e. the edge on the weft needle insertion side, at the end of insertion of the weft needle and closing the second single layer edge during return of the weft needle to form a double tubular edge; i) When said second single ply edge is closed, the stitch previously formed on its outer edge is pulled to the edge of the center part and the loop is drawn from this stitch into the center part by the tension of the weft thread. A method of weaving a belt having a tubular edge, characterized in that: 2. The weaving method according to claim 1, wherein the two weft threads are made of threads of different thicknesses. 3. The weaving method according to claim 1 or 2, wherein the first weft is composed of a single-filament yarn, and the second weft is composed of a multi-filament yarn. 4 (a) with said knitting needle, a loop of one weft thread is drawn through a loop of the other weft thread to form a stitch of said one weft thread; (b) a length of delivery of one weft thread forming said stitch; in addition to having a length greater than that required for the edge, and further,
The weft thread is longer than the delivery length of the other weft thread by an amount necessary to form a stitch and a loop drawn from the stitch and drawn into the central portion. The weaving method described in any of the above. 5. A weaving method according to claim 4, wherein the stitch is protected by a barrier thread cooperating with one of the weft threads. 6. Any one of claims 1, 2, or 3, wherein the knitting needle pulls out a loop of the locking yarn through loops of both weft yarns to form a stitch of the locking yarn. Weaving method described in. 7. The weaving method according to claim 6, wherein the stitches are protected by barrier yarns that cooperate with locking yarns. 8. The weaving method according to claim 6 or 7, wherein a thread thinner than the weft thread is used as the locking thread. 9 (a) said locking thread and barrier thread are fed by a single threader that surrounds a portion of both weft needles at the end of their insertion process; (b) said locking thread and A weaving method according to claim 7, characterized in that the barrier yarn is guided to the knitting needles passing below and above the weft needles, respectively. 10. A needle threader for a needle-type belt loom used for carrying out the weaving process of a belt having a tubular edge, the threader having: (a) a threader disposed pivotably on a shaft extending in the weft direction; (b) The free end of the arm is branched to form a bifurcated protrusion, and a small hole is drilled in the end of each protrusion so that the protrusion is engaged with each other. (c) The protrusion is formed in such a shape that it partially surrounds both weft needles in the upward movement of the present threader. Passer. 11 (a) The protrusion having the hole into which the barrier thread is inserted is formed into an arc shape of approximately 180°, and (b) The protrusion into which the locking thread is inserted is formed into a straight line that is the chord of the arc. 11. The threader according to claim 10, wherein the threader extends in the direction of the straight line and has a length that is about half of the length of the straight line.