FI75371C - FOER FARING FRAMSTAELLNING AV TEXTILIER. - Google Patents

Description

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Method for making wefts - Förfarande för framställning av textilier

The invention relates to a method for producing weaves. A catcher is used in the manufacture which passes the weft yarn through the tune. The woven fabric is made using two weft yarns fed from the sides of the weft to provide 5 natural edges to both edges of the woven fabric.

DE-A-8 71 278 discloses a device with which the above-mentioned method can be carried out. However, this device comprises two catchers, the first of which is arranged to work from the right edge of the vibe and the second of which is arranged to work from the left edge of the vibe so that both catchers take their own weft yarn alternately through the vibe. Such a device solution using two catchers is expensive in structure and the control of the operation of the device is complicated.

DE patents 869,476 and 117,099 disclose the so-called use of the shuttle in the preparation of weaves. When the shuttle is used, it is given a certain kinetic energy outside the tune 20, by means of which the shuttle passes through the tune. Applying such a policy is difficult. This is because it is difficult to control the kinetic energy of the shuttle so that in all cases the passage of the 25 shuttles through the tune is guaranteed. A shuttle that has no actual mechanical connection to the body of the weaving machine during transfers can be left out of the tune, on the edge to which it has been transferred during the tapping. It is therefore a completely different solution in terms of the transfer operation and operating principle of the 2 75371 yarns compared to the method which is the subject of the present invention.

Commonly used weaving machines are so constructed that the weft yarns are pulled through the web from one direction and cut at both edges with a cutting device. This creates an open edge according to Fig. 1, which can be transformed into a closed edge by means of an edge device, in which the free ends of the weft yarns 10 are tied to the edge according to Fig. 2.

It is not advantageous to make carpets and other heavy weaves as described above, since turning the ends of the weft yarns and tying them to the edge causes the edges to become too thick and thus wear quickly. The appearance of the carpet thus obtained is also disadvantageous. Rugs made with modern weaving machines usually have an open woven edge for the reasons mentioned above, (Figure 1). However, such an edge structure 20 has not gained acceptance among consumers.

It is an object of the present invention to provide a simple and reliable method, in particular for making carpets or other heavy weaves, so as to provide a natural edge on both edges of the weave. To achieve this object, the method according to the invention is characterized in that a single catch attached to the transfer rod is used in the manufacture, which alternately passes the weft yarns through the weft, moving away from the weft yarns back to the intermediate position after each transfer to allow the weft to change. Thus, in the application of the method, one catcher alternately passes * 3 75371 the weft yarns fed from the right side and the left side through the tune. During manufacture, the weft yarns are not cut, but each weft yarn passed through the tongue with the catch remains double in the tongue, forming a natural edge of the weft to the edge from which the weft yarn export began and a loop to the opposite edge (the end of the catcher's feed movement). After each feeding movement, the catcher detaches the 10 weft yarns in question in order to adhere to the other weft yarn after changing the tune.

An additional advantage of the method according to the invention is that the catching device applying the method can be built on a normal shuttle-operated mechanical weaving machine instead of the shuttle boxes and the percussion device. This makes it possible to weave directly from the yarn side, saving not only the production and replacement of shuttle sides but also the parsing of the ends of the weft yarns. As a result, production is faster and the efficiency of the machine 20 is better. Thus, the method achieves all the essential advantages of an automatic weaving machine as well as an intact natural edge, as with a conventional mechanical weaving machine.

The invention is illustrated in the following description 25 with reference to the accompanying drawings, in which Fig. 3 schematically shows a woven fabric provided with the method according to the invention and Fig. 4 schematically shows the steps of a woven manufacturing method.

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Figure 3 shows a natural woven fabric, in particular a carpet, obtained on both sides by the method according to the invention. The first weft yarn 1 forms a natural edge on the left side of the woven oi-5 and the second weft yarn 2 forms a natural edge on the left side of the woven. The first weft yarn 1 forms a loop on the left edge of the weave, which remains below the warp yarns of the edge. The same is true for the second weft yarn. The weft-10 yarns pass alternately in duplicate through the weft woman and a change of tone is performed after each catcher feed movement.

Figure 4 shows the implementation of the method step by step. In Fig. 4, reference numeral 1 shows a first weft yarn coming from a roll 1 'and reference numeral 2 a second weft yarn coming from a corresponding roll 2'. The hinge is indicated by reference lines 3 to the catcher. The catcher is indicated by reference number 4. The catcher 20 is attached to a feed rod 5 or the like which moves the catcher through the hinge according to a program applying the method. Both weft yarns come to the side through the guides 6 and 7, which are arranged in such a way that the catcher 4 gets a grip on the weft-25 yarn for passing through the weft.

The steps of the method are as follows: In Fig. 4a the catcher 4 is moved from its intermediate position, which in the case of Fig. 4 is on the left side of the tongue, using the transfer rod 5 to the right side of the tongue from where it has picked up the first weft yarn. the first weft yarn 1 and the weft yarn rest on the 75371 retaining spike or the like. (These structural details are not shown in the drawing). The catcher 4 moves out of the tune to the intermediate position and the tune is changed. This is followed by the manufacturing step shown in Fig. 4b, in which the catcher 4 grips the second weft yarn 2 and transfers it to the right edge, where it detaches at the end point 9 of the feed movement of the catcher 4 and rests on a support spike or the like. The catcher moves back to the left of the tune using the transfer bar. After changing the tone, the weaving continues according to step 4a.