EP0036920B1 - Process for weaving double-ply fabrics on smallware needle looms - Google Patents

Abstract

1. Process for forming a double weave on looms with ribbon-making needles, which can be used particularly for forming gussets in gathering braid and top ribbons for curtains and which involves forming a double shed at the locations where a double weave is to be made, characterized in that it involves using at least one warp thread (6) as a weft thread in the double-woven part, the said thread (6) continuing to perform its function as a warp thread in the single-woven part, this warp thread, when it serves as a weft thread being arranged substantially at mid-height in the upper shed, and the number of warp threads needed to be used a weft thread being equal to the number of longitudinal rows of double-woven parts (15) to be woven.

Description

The present invention relates to a process for forming a double fabric on looms with ribbon needles, particularly applicable to the formation of gussets in gathered braids and head ribbons for curtains.

Modern draw curtains are usually provided at their upper part, either with a gathered braid, generally consisting of a wide ribbon and another narrower, linked to each other at weaving at regular intervals, and by at least two gathered cords, either by a head ribbon which, at the same time as it decorates one end of the curtain, serves to give it a perfect pleating and to hide the rail of the frame, which makes it unnecessary to mount valances.

The gathered braid is provided at regular intervals with gussets or housings intended to receive the curtain hooks, each of these being in turn suspended from a support and sliding device able to move on the guide rail of the curtain.

For its part, a head tape is also provided with housings or gussets uniformly spaced from each other and capable of receiving hooks by means of which the curtain is suspended from the various sliding support devices.

Gathering trims and head ribbons of this type have given rise to a considerable number of industrial property titles, among which we can note the Spanish invention patents Nos ^. 211,960 and 225,534 and the Spanish utility models Nos ^. 49 067, 63 723, 90 390, 93 536, 96 507, 104 143, 131 522, 135 259 and 142 141. CH-A-531 592 deals with a method and a device for the simultaneous manufacture of at least three ribbons connected or not connected to each other and woven in the same passage on a needle loom.

According to this process, at least two superimposed crowds are formed in a common chain or in several independent chains; at least one member to insert the weft is introduced into each of these steps and each pick is linked by a needle to link the weft, associated with said member.

All these stripes and ribbons deposited and the others, already known and which have not been mentioned, have the drawback, however, that the double fabric of the gussets or housings is produced with a second weft thread, which is passed over the entire width. tape and is attached to the edges of it. This results in an unnecessary expense of weft yarn and weft floats between the gussets and the selvedges, left practically free, which give the fabric a completely unsightly appearance.

The object of the invention is therefore to provide a method making it possible to obtain a gathered braid or a head ribbon entirely free of these drawbacks.

To this end, in the process according to the invention, a double shed is formed at the places where a double fabric is to be produced and a warp thread is used as the weft thread in the double woven part, this warp thread being arranged, when it is used as a weft thread, substantially halfway up in the upper shed and the number of warp threads that it is necessary to use as weft thread being equal to the number of longitudinal rows of parts of double fabric that 'we want to weave.

• Figure 1 est une vue en perspective partielle de deux cadres de lisses et d'un peigne de battant, avec une foule simple ouverte de façon que les fils du cadre de lisses antérieur apparaissent dessus ;
• Figure 2 est une vue en perspective similaire à figure 1, mais avec une double foule, les fils du cadre de lisses antérieur apparaissant dessus dans la foule supérieure ;
• Figures 3, 4, 5, 6 et 7 sont des vues en plan, à une plus grande échelle, montrant les positions prises successivement par une aiguille trameuse auxiliaire, des aiguilles à languette et le peigne ;
• Figure 8 est une vue en plan du ruban déjà tissé, montrant, à une plus grande échelle, un détail d'un gousset ou logement.

In any case, the invention will be clearly understood with the aid of the description which follows, with reference to the appended schematic drawing, representing, by way of nonlimiting example, an embodiment of a device for setting work of this process:

• Figure 1 is a partial perspective view of two heald frames and a leaf comb, with a single crowd open so that the son of the heald frame appear above;
• Figure 2 is a perspective view similar to Figure 1, but with a double shed, the son of the heald frame appearing above in the upper crowd;
• Figures 3, 4, 5, 6 and 7 are plan views, on a larger scale, showing the positions taken successively by an auxiliary weft needle, tongue needles and the comb;
• Figure 8 is a plan view of the already woven ribbon, showing, on a larger scale, a detail of a gusset or housing.

It can be seen in these figures that the wires 1, which have passed through the eyelets of the heddles of the frame 2, or front frame in the pair of frames 2, 4, appear above them relative to the wires 3 of the single crowd shown in the figure 1, as well as with respect to the wires 3 of the upper and lower crowds of the double crowd shown in FIG. 2. In the position shown in FIG. 1, the loom is weaving the bottom 16 of the ribbon or braid, while in the position shown in FIG. 2, it simultaneously weaves the bottom 16 and a gusset 15.

We can see in Figures 2 to 7 that we use for the production of a gusset 15 a warp thread 6 as the weft thread in the part that we want to weave double, that is to say that where is the gusset 15. This warp thread 6, when it acts like a weft thread, is located substantially halfway up in the upper crowd, which is clearly shown in Figure 2, where we can see that this intermediate position of the warp thread 6 can, preferably, be obtained by passing this thread through the oblong eyelet 8 that has a smooth 7 of the frame 2.

It is obvious that it will be necessary to use as weft threads a number of warp threads 6 equal to that of the longitudinal rows of the double woven parts 15 that it is desired to obtain.

There is mounted on the loom at least one auxiliary weft needle 9, traditionally provided with a free end 11 V-shaped, capable of passing the warp 6-transversely in the crowd the number of picks sufficient to obtain the desired length of double woven part 15, so that the warp thread 6 introduced into the crowd by the screening needle 9 is retained on the side 18 opposite to that 17 of its introduction by a respective tongue needle 12, which forms the edge of the gusset 15.

The width of these gussets 15 can be modified by moving the tongue needle 12 transversely until it reaches the desired position. For this, action is taken on a screw 13 capable of sliding along an elongated opening 14 formed in the support of the needle 12.

In the succession of positions shown in FIGS. 3 to 8, it can be seen in FIG. 3 that the auxiliary screening needle 9 has started to cross the upper shed in the double shed represented in FIG. 2 and that the tongue needle 12 moves forward to the position shown in FIG. 4, in which it waits for the complete insertion of the pick by the screening needle 9 and, when the latter begins to withdraw, moves back in its turn ( see Figure 5) retaining the wire 6 and allowing the leaf 5 to move backwards to clamp against the length of ribbon already woven the two thread lines 6 which have just been inserted. In figure 6, a new cycle begins, which is about to end in figure 7 and we can finally see in figure 8 a piece of already woven ribbon 16 and, on a larger scale, a gusset fully woven.

Claims (2)

1. Process for forming a double weave on looms with ribbon-making needles, which can be used particularly for forming gussets in gathering braid and top ribbons for curtains and which involves forming a double shed at the locations where a double weave is to be made, characterised in that it involves using at least one warp thread (6) as a weft thread in the double-woven part, the said thread (6) continuing to perform its function as a warp thread in the single-woven part, this warp thread, when it serves as a weft thread being arranged substantially at mid-height in the upper shed, and the number of warp threads needed to be used as a weft thread being equal to the number of longitudinal rows of double-woven parts (15) to be woven.

2. Process according to Claim 1, characterised in that, to carry it out, there is arranged on the loom at least one auxiliary wefting needle (9), the free end of which has, in a known way, a V-shaped configuration and which is designed to insert the warp thread (6) transversely into the shed a sufficient number of picks to obtain the desired length of double-woven part (15), in such a way that the warp thread (6) introduced into the shed by the wetting needle (9) is retained at the opposite edge (18) to its edge of insertion (17) by means of an associated latch needle (12) or the latch needle forming the selvedge of the ribbon.

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