METHOD AND DEVICE FOR WEAVING

Abstract: Weaving method according to which at least one cloth (10 or 11) is formed by inserting at least one weft of textile material (yarn) (7, 8, 17, 18) between at least two webs of warp threads for the weave (binding warps) or filling (tension or filler warp) (2, 3, 4, 12, 13, 14) forming at least one shed (5, 6, 15 or 16) and by subsequently binding this weft (7, 8, 17, 18) through the closing of this shed (5, 6, 15 or 16) and the beat-up with the reed (9), characterized in that at least for a number of revolutions for the weft insertion of textile material at least three warp thread webs (2, 3, 4 and/or 12, 13, 14) are formed for one and the same cloth (10 and/or 11) and at least two weft threads (7, 8 and/or 17, 18) are simultaneously presented in at least two sheds (5, 6, 15, 16) formed between the warp thread webs (2, 3, 4, 12, 13, 14) during these weft insertions, at least one in each shed, whereby the two textile weft threads (7, 8 and/or 17, 18) are separately bound.

Description: Method and device for weaving. The present invention concerns a method for weaving, according to which at least one cloth is formed by providing at least one weft of textile between at least two webs by means of warp threads for binding or filler warps forming at least one shed and by subsequently binding this weft through the closing of the shed and the beat-up with the reed. In the known simple fabrics, in which one single cloth is formed, a weft which either contains one single thread, two threads or several threads which have been inserted in one and the same shed, is inserted in successive sheds, whereby for the shedding for the cloth to be woven warp threads are drawn at two levels. In case of single-cloth pile fabrics, loops are formed, every two revolutions, by inserting wires in a separate shed formed to this end, between the web formed by working pile threads and either of the two warp webs of the base fabric. So there are three thread webs for the formation of two sheds, one of which is a shed for textile weft and the other is a shed for the loop-forming wires. In the known so-called double pile fabrics, in which a bottom cloth and top cloth are woven and separated after the weaving - by cutting possible weave threads or pile threads stretching out from one cloth to the other - one weft is inserted alternately into the top cloth and the bottom cloth at each revolution, using the same weft inserter. Also in the special case of so-called double-woven pile fabrics with double weft insertion, two wefts are inserted, one in each of the cloths. Theoretically, there are four warp thread webs, two for the top cloth, two for the bottom cloth, but which form only two distinct, useful sheds. The four webs are practically reduced to three and form two sheds for weft thread insertion, since the lower warp thread web of the top cloth and -the top warp thread web of the bottom cloth are separated by an interspace but do not form a real shed for the weft insertion. Two cloths are formed during the weaving process (double ply) . During the weaving process, the two cloths are temporarily connected to one another by pile threads which alternate between said cloths. After the weaving, these pile threads are cut by means of a knife so as to obtain two separate fabrics. According to the present state of the art, pile fabrics for carpeting or velvet in which the pile carries a design are woven on machines - either singly with wires to form loops or tufts inserted every two or three revolutions, with a base ' fabric with one wef insertion per machine revolution, or doubly with two separate base fabrics, each acting as the loop holder for the other, in which one weft inserter inserts a weft thread alternately into the upper or bottom cloth., or in which two weft inserters carry out insertion simultaneously in the upper and bottom cloths and thus make the basic connection(s) between the warp material and the pile threads according- to a selection mechanism for pattern formation, in which jumps in the upper and bottom cloth are made above and below these weft threads. Pile threads selected in this way can also change, from the upper to the bottom cloth, thus binding the two fabrics together (at a distance) , and leaving single fabrics with pile after they have been cut. However, there are certain requirements for the binding techniques for patterned carpets which place limitations on the production process. These are a mechanical replacement for hand-knotted carpets, and must imitate the properties of such carpets as closely as possible. In a hand-knotted carpet, individual tufts are knotted into a base warp (which later forms the base fabric) , and the two ends of the tufts stand up so as to form the colour points of the carpet; as a result of the knotting, these points (the ends of the tufts) are distinguishable from the adjacent points (knots) , and the patterns formed consist of areas of colour delimited by the contours of knots with a different colour. On the back, these knots should form the same pattern with clearly defined contours ("ohne Mischkontouren") . Mechanically-made carpets must show the same perfections, or at least approach them: the tufts must have a maximum density both in the hairy pile surface and in the backing (density or fineness of carpet = No. of knots per m 2 ) , because the tuft must be firmly pressed (it is not knotted round the warp or weft) , and also because this increases the market value of the carpet. The pattern in the hairy surface must be the same as the pattern on the back and must not have any contour mixing faults, in the same way as the hand knotting which it is wished to imitate. In a carpet or cloth that is mechanically woven with loops formed over wires, it is necessary to ensure that there is no mixing of colours between the tuft ends or the backing knots at the points where there is a change of colour, either in the pile surface or on the back. Such faults (known as contour mixing) disqualify the carpet. The solution to this problem in so-called through-woven carpets (with a pattern on the back) made it necessary to go from a cycle of two revolutions per wire insertion (tuft row) to three wire insertions per cycle; the entire system therefore had to be converted to production cycles with three machine revolutions for one tuft row in order to obtain a correct pattern. A solution to this was sought in double weaving. In the known so-called double fabrics, the weft is inserted successively in an top cloth and a bottom cloth. So-called "blisters" can form above or below at places in the fabric, giving a design effect. At other places, the two warp webs can mingle completely with each other, so forming just one fabric, in which the warp threads are united with wefts. However, it is also possible for a set of warp webs for one fabric to be kept apart from the set of warp webs of the other fabric at all times, so that successive wefts belong first to one fabric and then to the other. Such a cycle woven with one weft inserter produces two fabrics. Between the two fabrics, so-called pile threads can be woven, which after the weaving process are cut to form two individual fabrics. This process is used to solve the pattern problem with carpet production described earlier; for each two machine revolutions of wefts, a tuft can be drawn round one weft thread in the upper or bottom cloth. Selection of the pile-forming threads is by means of the inactive piles which remain outside the sheds of the weaving process (and so are not bound in) . The pile tufts stand cleanly in the base fabric of both carpets. However, " when the pile threads which are not bound in are removed, half tufts are also removed in one of the fabrics (the lower one) at the point where pattern contours (colour changes) occur. But if the inactive piles are also bound into the back of the fabric in such a weaving method, then the sharply defined back pattern is lost (even with the imitation method of taught and slack warps) . With just one weft insertion in the upper and bottom cloth successively, it is never possible to obtain more than one pile row (either above or below) per revolution. Furthermore, if it is wished to bind the unselected pile threads into the base fabric, then the clearly defined pattern is lost. Perfect pile fixation (with binding in of the inactive pile threads and a perfect back pattern) requires twice the number of cycles (three revolutions per pile row) for perfect wire fabric for carpet, i.e. six revolutions of the weaving machine. This gives one pile row in the top cloth and one pile row in the bottom cloth, and two carpets from one set of inactive piles. In order to nevertheless enable the inactive piles to be bound in (so as to reinforce the backing with threads "lost" from the process) , and also to keep the crossing of the many binding threads of the two fabrics (base or back fabric) as a separate process at the levels at which they are meant to finally come out, the method of weaving with two shuttles (two weft inserters) was adopted. However, for correct carpet formation, this leads to the same problem as already described for single fabric rod weaving (three revolutions per cycle for correct binding in) , but for each of the two fabrics of the double fabric weaving machine: a correct fabric with bound in inactive pile and active pile, with the pattern without contour mixing either on the pile side or on the back, requires a weaving cycle of at least three revolutions. In the carpet, three wefts are bound in for each pile row (this is determinant for the product which it is wished to obtain) . If it is wished to work with two revolutions per pile row, in order to obtain higher production, and at the same time keep the "ohne Mischkontouren" solution, then one is forced back to the necessity of selecting the active pile threads from the inactive "tractor threads" from outside these base fabrics, in this case preferably between the two base fabrics in the region of the active pile. Not binding in lowers the quality of the backing and makes a removal operation necessary; this results in the loss of a half tuft which is removed by means of the tractor at the point where the colour changes. The present invention aims to provide a new weaving method according to which either new weaving patterns can be obtained or existing weaving patterns can be realized faster, and by means of which, in the case of pile fabrics, a back pattern can be obtained without so-called "Mischkontouren". To this aim, according to the new invention, for ordinary simple fabrics (not pile fabrics) , at least with a number of revolutions for weft insertion, at least three warp thread webs are formed for one and the same cloth and, during these weft insertions, at least two textile weft threads are simultaneously inserted in at least two sheds formed between the warp thread webs, at least one in each shed, whereby the two weft threads are separately bound. Both for single fabrics and double fabrics, it is possible to obtain new patterns by this method, while existing patterns or a greater weaving density with much greater output can be achieved; the weaving method involves at least twice as many weft insertions per revolution. For single-woven pile fabrics, at least with a number of revolutions, for example every second revolution, at least four warp thread webs are formed for weft insertion forming at least three sheds, two for the insertion of two textile wefts for the base binding and at least one for the insertion of loop- or pile-forming wires. The pile threads selected are preferably incorporated into the fabric so that the pattern obtained on the pile side by the pile loops is also obtained on the back, while the pile threads which are not selected are bound into the fabric. This method can be applied for both simple pile fabrics whereby one cloth is being woven with pile threads, and double fabrics whereby two cloths are simultaneously woven which either coincide due to warp threads which merge the two cloths as they cross (heavy cloth fabrics, multi- layered fabrics, technical cloth, filtering cloth, driving belts, etc.) or also for double fabrics whereby the base fabrics are kept at a distance from one another but which still remain connected by pile threads which alternate between the cloths. In the case of double fabrics, the two cloth's are usually separated afterwards by cutting these connecting pile threads. Two pile fabrics are the result. In the special case of double-woven pile fabrics as described above (Fig. 2) each of the opposed cloths, with regard to the selected pile threads of the other cloth, forms an anchorage for these working pile threads in a web outside its. proper weaving cloth web, a function which is assumed by loop- or pile-forming wires in simple pile fabrics (Fig. 3) . The pile threads of one cloth of a double pile fabric are anchored in the other piece after selection (working pile) in the way that in simple cloth pile fabrics selected pile threads are presented above the loop-forming wires and are bound in successively. cutting wires are used to make velvet, smooth wires to make burls. The end product according to Fig. 2 is the double of the end product according to Fig. 3 (face to face) . In case of pile double fabrics, at least two weft threads can be simultaneously inserted during the above-mentioned weft insertions in the top cloth alone and one weft thread in the bottom cloth or, vice versa, two weft threads in the bottom cloth and one weft thread in the top cloth, but according to a special embodiment of the invention at least six warp thread webs are formed for the two cloths in view of the above-mentioned weft insertions, whereby the two middlemost webs can practically coincide, such that four sheds are formed. Thus, during these weft insertions at least four weft threads are simultaneously presented, at least one in each shed, whereby the four weft threads are separately bound through the movement of the warp thread webs, whereby patterns are formed by selecting pile threads and incorporating them into the top cloth and the bottom cloth during weft insertion, so that the pile threads selected form a pattern both on the pile side and on the back, while the pile threads not selected are distributed evenly over the top and bottom cloth and woven in. The method for weaving a double pile fabric in which four weft threads are inserted simultaneously is known from US- A-2 329 739. However, there is no indication of how the pile threads are selected, and the weaving of patterns is not described. The lack of a suitable selection method for pile threads makes it impossible to weave a pattern which meets the requirements for carpets. Also, the pile threads remain on the inside of the two fabrics, so that they cannot be seen on the back. In the working method according to the invention, the top and bottom cloths are woven" simultaneously as perfect mirror images of each other, whereby pile threads are selected simultaneously from the bottom and the top cloth and made to run between the back of their own cloth and the cloth opposite. Before the first and subsequent uneven weft insertions, the pile threads selected which are incorporated into the top and bottom cloths go to the outside of the four sheds described above, and form a so-called fifth shed, which encloses the four sheds which form the two base fabrics of the top and bottom cloths by weft insertion. The two fields of the active pile threads change positions at the second and subsequent even weft insertions (the top selected pile threads go from the back of the top cloth to the back of the bottom cloth, and vice versa for the bottom selected pile threads) . The selection cycle is then complete. The pile threads not selected, evenly divided between the top and bottom cloths, remain more or less stationary in their own cloth during the whole cycle. For very dense fabrics (i.e. many pile tufts per unit reed width), is possible to split the selection into pairs, with each part of the pair working simultaneously, either from the top cloth or from the bottom cloth. At present it is practically impossible to weave these high densities on existing machines, since the dense webs of threads running parallel have to cross each other. Weaving with four sheds instead of two pulls these webs apart (the inactive, dead piles remain stationary; the active piles can still be separated and run parallel downwards between even and- uneven revolutions, and come alternately on the back) . Practically, a double pile fabric is produced, and during the successive weft insertions (i.e. at each revolution) at least one series of pile threads are interwoven in an entirely symmetrical manner in the top cloth and at least one series of pile threads in the bottom cloth. The above-mentioned weft insertions whereby at least two weft threads are simultaneously inserted, each in its own shed, for one and the same cloth can alternate with weft insertions whereby one single weft thread is presented or they may succeed one another. According to an advantageous embodiment of the invention at least two weft threads are inserted, each in its own shed, for one and the same cloth at each weft insertion. This embodiment is important for double fabrics and in particular for double pile fabrics such as carpets. According to an advantageous embodiment of the invention, three warp thread webs are formed for the above-mentioned weft insertions whereby at least two weft threads are inserted in one and the same cloth, whereby the middlemost is more or less stationary and the other are on top and below respectively during the shedding and alternate when the weft threads are bound. The middle web can at the most move only a little without actually deviating from the levels between the double weft insertion, except for the threads selected from it which have to leave their own base fabric. The invention also concerns a device which is suited for the application of the method according to any of the above embodiments. Thus the invention concerns a weaving device which contains a-mechanism for the formation of a shed and a weft mechanism, characterized in that the mechanism for the formation of a shed is a mechanism which can simultaneously form at least two sheds for one and the same cloth being woven, whereas the weft mechanism is a mechanism which can simultaneously insert at least two wef threads in these sheds. In a special embodiment of the device according to the invention the mechanism for the formation of at least two sheds for one and the same cloth contains three shafts, namely a standing- shaft to support a middlemost warp thread web which remains more or less stationary and two shafts moving up and down for two other warp thread webs which are situated on top and under the first respectively and which alternate during the binding. According to a peculiar embodiment of the invention the device is a double-cloth weaving device and the mechanism for the formation of sheds is a mechanism to simultaneously form at least four sheds, whereas the weft insertion mechanism is a mechanism which can simultaneously insert at least four weft threads in these sheds. The double-cloth weaving device may contain a pile mechanism for presenting pile threads. Practically, such a pile mechanism contains a pair of pile threads consisting of a pile thread for the top cloth and a pile thread for the bottom cloth, a pulley mechanism controlled by a selection mechanism and a part which, during the selection of the above-mentioned pile threads, is moved up and down by said selection mechanism, whereby the pulley mechanism contains two cable ends with which the heddle eyes of the two pile threads of the pair are connected and is built such that, due to the movement of the above-mentioned part, one cable end is moved upward whereas the other cable end is moved downward to the same extent. In particular, the pulley mechanism contains a pulley block suspended on the selection mechanism and bearing two wheels, a first cable running over either of the wheels, one end of which is stationary under this wheel and the other end of which is connected to the heddle eye of one of the pile threads, and a second cable running over the other wheel, one end of which is stationary above this other wheel, whereby this second cable runs further over a reverse gear mounted stationary above this wheel with regard to the latter end, and whereby the other end of the second cable is connected to the heddle eye of the other pile threads. The first cable is connected to the heddle eye of the pile thread for the top cloth and the second cable is connected to the heddle eye of the pile thread for the bottom cloth. The above-mentioned selection mechanism may contain a suspension mechanism per pulley mechanism formed by a bar- shaped element, by a hook attached to the bottom of the bar-shaped element and onto which the pulley mechanism is suspended by means of a cable and which is made such that the suspension element naturally tilts over to one side if it is free, and by a hook element mounted at a distance from the top end of the bar-shaped element and protruding at the side of this element, and finds a stationary support for each suspension element onto which, for the above-mentioned tilted position, the hook element is suspended, and- a knife moving up and down during the weaving, to which the hook element becomes solidly attached. This solid attachment can be formed by means of pressure exerted by needles controlled by cardboard or paper, or even electromagnetically before selection or by an electromagnet, either directly or by the intermediary of a rocker arm which pushes the suspension element away from the above-mentioned tilted position into a position in which the hook element can hang on the knife which moves up and down. In order to better explain the characteristics of the invention, by way of example only and without being limitative in any way, the following preferred embodiments of a method and device for weaving according to the invention are described with reference to the accompanying drawings, in which: Figure 1 is a schematic representation of a weaving device according to the invention; figure 2 is a schematic representation of a fabric made by means of the device in figure 1; figure 3 is a schematic representation of a fabric made according to the method of the invention, but . with a different weaving pattern than the fabric in figure 2; figure 4 is a schematic representation of a fabric analogous to that in figure 3, but with a third weaving pattern; figure 5 is a schematic representation of a fabric analogous to that in figures 3 and 4, but with a fourth weaving pattern; figure 6 is a schematic representation of a fabric analogous to that in figures 3 to 5, but with a fifth analogous weaving pattern; figure 7 is a schematic representation of a part of a selection mechanism for pile threads in a weaving device according to the invention, in the non- selected position; figure 8 represents the part from figure 7, but in another, namely the selected, position; figure 9 represents the part from figure 8, but in its topmost position (for the first and uneven revolutions) ; figure 10 represents the part from figure 8, but in its bottommost position (for the second and even revolutions) ; figure 11 is a schematic representation of a part of the pile mechanism in a weaving device according to the invention; Figure 12 is a schematic representation of a part of the pile mechanism in figure 11, but for another embodiment of this pile mechanism. Figure 13 is a schematic representation of a part of the pile mechanism in figure 12, but for another embodiment of this pile mechanism. figure 14 is a schematic representation of a weaving device analogous to that in figure 1, but with guides for weft insertion elements in the rearmost position of these guides; figure 15 is a schematic representation of the device in figure 14, but with the guides in their foremost position. When weaving "according to the invention, for each cloth that is woven, i.e. for the single cloth in a simple fabric or for each of the two cloths in a double fabric, whether or not with pile threads, for at least a number of revolutions of the weaving machine and so for a number of weft insertions, by means of the shafts 1, not two warp thread webs and one shed are formed as usual, but at least three warp thread webs 2, 3 and 4 and so at least two sheds 5 and 6 are simultaneously formed. A warp thread web 3 remains more or less stationary during the weaving: - In case of a simple fabric, it forms more or less a bisector web of two binding warp thread webs which alternate around it. The stationary warp is situated more or less in the extension of the cloth which is already woven. - In case of a double-cloth fabric, stationary webs 3 and 13 are symmetrically inclined upward and downward with regard to the double cloth which is already woven, whereas the other warp thread webs 2 and 4 are moved up and down in the usual manner during said revolutions and alternate. At each revolution whereby two sheds 5 and 6 are formed in one cloth 10, two weft threads 7 and 8 are simultaneously inserted in the two sheds 5 and 6 in the usual manner, for example by means of shuttles, projectiles, rapiers, compressed air, etc. These two weft threads 7 and 8 are separately bound due to the closing of the sheds 5 and 6 and the beat-up with the reed 9. Thus, during the same revolution of the machine and the bottom cloth 11, also the two sheds 15 and 16 are formed and weft elements with weft threads 17 and 18 are provided. The two weft threads can be presented simultaneously at each revolution and so with all weft insertions or with a series of successive weft insertions, or they can be presented intermittently, for example alternately with weft insertions whereby only shed is formed and only one weft thread is inserted in the usual manner. Figure 1 is a schematic representation of a weaving device for the application of the method according to the invention on a double-cloth fabric, for example two carpets, whereby not only for the formation of the top cloth 10 at least during certain revolutions three warp thread webs 2, 3 and 4 and two sheds 5 and 6 are formed, but this is also simultaneously done for the bottom cloth 11, and thus also for this bottom cloth three warp thread webs 12, 13 and 14 and two sheds 15 and 16 are formed. Two warp thread webs, alternately 4, 14 and 2, 12 are situated in the extension of the woven cloth 10 or 11 when the sheds are formed and practically coincide then. The warp thread webs 3 and 13 are stationary and are supported by one and the same shaft 1 with two eyes on the heddles. The warp thread webs 2 and 12, 4 and 14 respectively move in the same manner and the warp threads of the webs 2 and 12, 4 and 14 respectively are also supported by the same shafts 1 by means of two-eyed heddles as represented in figure 1. Four weft threads, namely two weft threads 7 and 8 for the top cloth 10 and two weft threads 17 and 18 for the bottom cloth 11 can be simultaneously inserted in the four above- mentioned sheds 5, 6, 15 and 16. The weft insertion elements for the insertion of these weft threads 7, 8, 17 and 18 can be kept at their level due to their own rigidity and the guiding of the positioned warp thread webs and the reed. However, when several sheds are formed one on top of the other, as is the case here, guides for the weft insertions - as known from traditional weaving methods - may be necessary. This will be the case when rigid rapiers are used at high speed for the weft insertion and especially when flexible lancets or projectiles are used for the weft insertion. Unlike in existing weaving machines with weft guides, these guides cannot be fixed with regard to the reed and the sley and move in front of the reed, whereby thanks to the shape of the sley movement they duck away from the closing and closed warp threads before the beat-up. Since they have a double or multiple guide function, they must be mounted higher and they often cannot remain fixed in the sley, stationary with regard to the fixed reed, but they are forced rather to duck away from the sheds before the beat-up motion takes place. These guides 44, as the sley 50 turns backward with the reed 9, are forced, through slots 51 provided to this end in the sley 50, parallel to the reed, in the sheds between the warp threads and this as close as possible to the reed 9 since the sheds are the biggest there, so as to carry out their guiding function at the back in stationary positions parallel to the reed 9 when the reed 9 stands still. When the sley moves towards the beat-up they move downward, also parallel to the reed, outside the shed and under the fabric. Naturally, these guides should not be able to hook into warp threads or weft threads during the vertical movement. The presented wefts remain outside the guides 44. Their movement as described above is derived from the sley movement. A possible construction of these guides is represented in figures 14 and 15. The pile threads are not represented in these figures for clarity's .sake. The guides 44 for the weft insertion elements are mounted on a horizontal beam 45 situated under the sley 50 and carried on both ends by legs 46. These legs 46 are parallel to the legs 47 of the sley 50 carrying the reed 9 and they can be shifted in their longitudinal direction with regard to the reed 9 by means of slider guides 48, one and other such that the guides 44 are situated on the side of the formed fabric near the reed 9. In the rearmost position of the reed 9, the guides 44 are situated in the position represented in figure 14 through slots 51 in the sley 50 and through the warp threads. As the reed 9 is revolved for the beat-up, the guides 44 revolve as well, but at the same time they shift downward as the ends of the beam 45 are fixed to arms 49 at a distance from the pivot of the sley legs 47 which are fixed on the frame of the weaving machine by means of hinges placed at the back. At the time of the beat-up the guides 44 are situated entirely under the formed fabric and deep in the slots 51 in the sley 50 provided to this end, in the position represented in figure 15. Although a double fabric can be woven with the device according to figure 1. only three shafts ' 1 are required with two-eyed heddles to support two warp threads 2, 12 and 4, 14 for figure 1, whereas the traditional double- cloth weaving machines require six shafts. Moreover, the warp thread webs 3 and 13 are stationary, such that in fact no moving shaft 1 is required for these warp threads and so even two shafts suffice. Moreover, these two shafts can work in closed opposition, up against down and down against up, which greatly simplifies the known construction forms of the drive with levers and cams. Figure 2 represents a fabric made by means of the above- described device in a traditional manner with a cut across the weft threads whereby at each weft insertion both for the top cloth 10 and the bottom cloth 11 two weft threads 7, 8 and 17, 18 respectively were simultaneously inserted. For clarity's sake, the warp threads have the same reference number as the warp thread webs to which they belonged during the weaving. Figure 2 clearly shows how at each weft insertion two weft threads 7 and 8 are bound between the warp thread webs 2, 3 and 4 of the top cloth 10 and two weft threads 17 and 18 are bound between the warp thread webs 12, 13 and 14 of the bottom cloth 11. Moreover, the double-cloth fabric according to figure 2 is a pile fabric and in each of the cloths, two sorts of pile threads 19, 119 and 20, 120 are interwoven in the usual manner by means of a pile mechanism. It is characterized, however, in that not only the two cloths 10 and 11 are entirely symmetrical mirror images, but also the working pile threads 19 and 119. When they are not selected, the pile threads are lying with the filler warp threads 3 of the top cloth 10 and with the filler warp threads of the bottom cloth 11 respectively. Each of the cloths contains as many dead or non-selected pile threads whereas, when a series of pile threads 19 or 20 are selected for pile formation between the warp threads of the top cloth 10, as the weaving device reverses, a series of corresponding pile threads 119 or 120 will be simultaneously selected for pile formation between the warp threads of the bottom cloth 11. These series of selected pile threads alternate between the two cloths in an entirely symmetrical manner as is clearly shown in figure 2. Said figure 2 represents a double-pile fabric which is the double of the simple pile fabric in figure 4. In this figure 2, the wefts which are represented one on top of the other, being the pairs 7 and 8 and the pairs 17 and 18, are simultaneously inserted per four, successively per revolution in the loom. When reading figure 2 from left to right, one discerns the first four, the second four, the third four wefts, etc. inserted at the first, second, third, fourth, etc. revolution respectively. As will be explained below, the selection is done as the warps cross at the end of an "even" revolution and beginning of an "uneven" revolution. A total cycle, i.e. in between two selections, takes the time of an even plus an even revolution. Figures 3 and 4 represent in a similar manner a simple fabric which was made according to the above-mentioned method. According to the new method, at least three warp thread webs 2, 3 and 4 are formed which intersect in at least two sheds 5, 6 for the weft insertion of textile materials. A fourth pile warp thread web 19 forms a third shed which may serve for the insertion of loop or pile- forming wires 22. Of the textile thread webs at least one, namely the warp thread web 3, can remain stationary, which represents a number of advantages. For the fabric according to figure 3, two weft threads 7 and 8 were inserted at each weft insertion and at each revolution of the weaving machine, while during two successive weft insertions the pile threads 19, 20 were swapped over stationary wires 22 in the warp direction. As the fabric advances, the selected pile threads move up further with their base fabric, and at the end of the wires either form burls if the wires do not have a knife or velvet if there is a knife on the end of the wires. For the fabric according to figure 5, two weft threads 7 and 8 and a non-cutting wire 23 were alternately inserted with two weft threads 7 and 8 and a cutting wire 22 at the successive revolutions of the weaving device. Three sorts of pile threads 19 and 20 were used. Pile-forming threads 19 and 119; 20 and 120 ... are half withdrawn from the middle field (filler warp 3 and dead piles) over the wires 22 or 23 and led under the back shoot, and at successive revolutions alternate under the back shoot and over the wires 22 or 23. The cycle consists of two revolutions, after which selection takes place once more. Figure 2 represents the double fabric which is the double of the fabrics according to figure 4. In a simple fabric, the wires 22 assume the function of the counter cloth in the double-cloth fabric, bottom for top and top for bottom. The pile threads only form a pile in the double- cloth fabric when they are anchored in the other cloth, whereas in the simple cloth they form their pile by joining to form loops over wires inserted into separate sheds. In the fabric according to figure 5, two wefts 7 and 8 and a non-cutting wire 23 were simultaneously presented at each revolution. Three sorts of pile threads 19, 20 and 21 were interwoven. In the fabric according to figure 6, which is a "cloquέ" fabric, two weft threads 7 and 8 were simultaneously inserted over the entire width of the fabric and not necessarily bound over the entire width to form one cloth, such that a top cloth 10 and a bottom cloth 11 were locally formed and as it were blisters are formed in the fabric. The non-filled circles in figure 6 represent positions of weft inserters which remain active but by means of which weft thread is incorporated in the single cloth, i.e. the non-blister parts. Inserting two wefts simultaneously enables weaving to be carried out faster. From the above it is clear that in the case of pile double-cloth fabrics made according to the invention, selected pile threads for the top cloth 10 and for the bottom cloth 11 run symmetrically. Figures 7 to 10 represent a part of a pile mechanism which can easily realize this symmetrical course. Per pile thread is provided a heddle eye in the usual manner, but the heddle eyes for two corresponding pile threads for the two cloths 10 and 11 which should be simultaneously moved in a symmetrical manner, i.e. to the same degree but in the opposite sense, at the time of the selection are suspended on one and the same pulley mechanism 24 as represented in figure 11, and are thus controlled by one pull-up hook (suspension element) . The use of the pulley lever to control the pile threads (pattern threads) whose positions (the heddle eyes) have to be altered over a large distance is known. What is not known is the use of a pulley mechanism 24 which comprises a pulley block 25 with two wheels 26 and 27 and suspended by a cable 28 from a suspension element 29. A cable 30 runs over the bottom wheel 26, one end of which is fixed to a stationary part 31 of the weaving device and the other end of which is connected to the heddle eye for a pile thread of the top cloth 10. A cable 32 runs over the top wheel 27, one end of which is fixed above this wheel 27 to a stationary part 33 of the weaving device. The cable 32 also runs upward from the wheel 27 and over a reverse gear 34 mounted on the part 33. The hanging end of the cable 32 is connected to the heddle eye of the pile thread of the bottom cloth 11. It is clear that if the pulley block is moved upward over a distance L/2, the end of the cable 30 connected with a heddle eye will also be moved upward over a distance L and the end of the cable 32 connected to a heddle eye will be moved downward over the same distance L. The variant of the pulley mechanism shown in figure 12 differs from that in figure 11 in that the cables 30 and 32 are directly connected by pull-and-push connections 52 and 53 to the heddle eye of a pile thread of the top and bottom cloth respectively. These connections can transmit a forced up-and-down motion, without change of length, from the cable sections 56 and 57 which are connected to cables 30 and 32 and are led over reversing wheels 54 and 55. Such pull-and-push connections may for example consist of metal cables in stationary tubes. For the sake of simplicity, only one control mechanism is shown in figure 12, but it is clear that such a mechanism is present for each pair of pile threads (and for each cloth) in a similar manner to that shown in figure 11. The pull- and-push connections 52 and 53 connect the counter-acting cables 30 and 32 to the heddle eyes of the pile threads in the top and bottom cloth. These connections can pull and push and so replace the harness consisting of harness cords which constantly have to be under tension, so that no counter-weights or springs have to be used any more for the downwards movement. The cable section 56 is connected at one end in 60 either directly or via the pull-and-push connection 52 to cable 30, and at the other to the stationary part 31, and in between runs over the non-stationary reversing wheel 54 which is solidly attached to the pulley block 24. Together with the cable 30, the cable section 56 forms a closed circuit. The pulley wheels 26 and 54 make up part of the pulley block 24 which is pulled downwards by a spring 58, so that the cable 32 is kept under tension. The cable section 57 is connected at one end in 59 either directly or via the pull-and-push connection 53 to cable 32, and at the other end in 61 to the section of cable 32 located between the reversing wheel 34 and the top wheel 27 of the pulley block 25, and in between runs over the reversing wheel 55, which is also stationary-mounted with respect to part 31 of the weaving mechanism. Together with a section of the cable 32, cable section 57 forms a closed circuit, solidly attached to cable 32 in 61. The cable section 57 is attached to the section of the cable 30 between the cable wheels 26 and 55. The variant of the pulley mechanism shown in figure 13 differs from the mechanism described above according to figure 12 in that the cable section 56 and thus also the cable wheel 54 are omitted, and the cable section 57 in 60 is attached to the section of cable 30 which moves downwards. In this case, the cables 30 and 32 can form a continuous cable with cable section 57. Eac . of the suspension elements 29 consists of a bar- shaped element 35 which carries a hook or foot 36 on its bottom end onto which the cable 28 is fixed, such that the suspension element 29 tilts into the position represented in figure 7 when it is free. The hook 36 at the same time serves as a support for the suspension mechanism 29 and as a suspension hook for the pulley block 24. The supporting point (the supporting rib) and the suspension point (the suspension rib) are situated above and next to one another in such a way that the supporting point (the supporting rib) forms a point or axis of rotation on the pressed-on bottom grid 43 around which the suspension element 29 tilts. At a distance from the top end, a hook element 37 in the shape of a sharp head protruding sideways is fixed on the bar-shaped element 35. Before the tilted position represented in figure 7, the hook element 37 of the suspension element 29 is situated right above a support 38 formed by a knife of a mechanism with two knives 38 and 39 moving up and down, but of which a series of knives 38 remain stationary. Just before there is a selection of pile threads, a knife 39 moving up and down during the weaving is situated next to each support 38. All knives 39 are solidly attached to a moveable grid 40. Before the selection the bottom grid 43 brings the suspension elements 29 into the position represented in figure 7, in which all suspension elements 29 are tilted as a result of the special shape of the hook or foot 36. All hook elements 37 are placed above fixed supports 38, somewhat higher than the moveable knives 39. At the time of the selection, which takes place with the reed of the sley in the beat-up area . (crossing of the threads) , the suspension element 29 is tilted from the tilted position, with the hook element 37 above the support 38, into the position represented in figure 8 by direct electromagnetic attraction or by means of an L- shaped lever 41 suspended onto a balance knife in the manner of a balance in figures 7, 8 at the top left of the electromagnet 42. Such a combination lever/electromagnet 41/42 is provided per suspension element 29. The balance- shaped L-lever 41 contains a first horizontally drawn arm made of ferromagnetic material situated above the core of the electromagnet and which forms the anchor which, as the coil is excited, is attracted by the core, and a heavier arm hanging down made of non-ferromagnetic material which lies against the coil when in rest position. The balance lever hangs with the interior angle between its arms in a tilting manner on a sort of balance knife. When the coil of the electromagnet 42 is excited, the lever 41 will tilt and push the suspension element 29 away from above the support 38 to above the knife 39. The lever enlarges the smaller movement of the moveable anchor part (part of the lever 41) of the electromagnet 42. Due to this shape, the slot for the required movement will be very small and the current consumption will be very low. Instead of the electromagnet 42, a rotating electromagnet can be used which revolves a 1/4 turn. After the selected suspension elements 29 engage the knives 39, the bottom grid 43 starts to descend and the moveable grid 40 with the knives 39 goes up. As a result of this, as represented in figure 9, the selected suspension element 29 is also moved up. The non-selected suspension elements 29 remain suspended on the supporting knives 38. The selected (figure 8) pile threads 19 and 119, which are controlled by the suspension elements 29 on moveable knives 39 (figure 8) via the cables or harness cords 28 which are doubled in the pulley block 25 to 30 (for 19) and 32 (for 119) , come into the highest, lowest position respectively of the first revolution (as will be the case for further uneven revolutions) . Before a following weft insertion (second and following even revolutions: fourth, sixth, etc.), there is downward movement of the grids 40 and 43, and the selected suspension element 29 will also go downward into the position represented in figure 10. Through the action of the pulley mechanism 24 and the symmetrical or mirror- image doubling thus obtained, this position coincides with the opening position of the shed at the second revolution and following even revolutions (figure 1) whereby the weft threads are inserted. Finally, the grids 40 and 43 move upward again together with the knives 39 into the position represented in figure 7, ready for a new selection. The above-mentioned suspension element 29 is also moved upward and lifted from the knife 39 with its hook element 37 at the end of the upward movement of the bottom grid 43, as a result of which it tilts into its initial position again represented in figure 7, since in the meantime also the lever 41, as the electromagnet 42 is no longer excited, has reassumed its initial position. After a following even weft insertion the above-described cycle of two revolutions (even and uneven) can be repeated: we are back at the selection position. Only those threads forming a pile are taken up and the non-selected pile threads remain on the fixed supports 38, which reduces the load on the pile mechanism to a minimum. The selection is positive, which means that the electromagnets 42 are only excited when the accompanying pile thread must be inserted. When weaving according to the above-described methods and per cycle of two revolutions, i.e. per eight wefts, of all series of pile threads 19, 20, 21 of the top cloth 10 and.119, 120 of the bottom cloth 11, only one pair of pile threads (for example 19 and 119) should be selected for a weft insertion (before the uneven revolutions) . To this end, only one electromagnet 42 is excited during about a quarter of a revolution, more or less at the time of the reed beat-up at the start of the first, the third, the fifth ... revolution of the weaving device. The above- described anchor slot which is kept small requires a minimum amount of exciter current. A selection with one electromagnet 42, either mechanically by means of a needle or electronically by means of an electronically-controlled build-on kit, is suitable for a cycle with two revolutions of the weaving device and makes it possible to provide two tufts in a revolution per cloth or, in other words, four tufted pile threads of one and the same pile thread, and thus to obtain one and the same colour in a single cloth around subsequent back shoots in a cycle: so there is no colour mixture as in the existing double-revolution double-cloth fabrics with twice a weft insertion per cloth. Moreover, this doubles the possibilities of existing weaving methods. Not only does the method allow for a double production with the same pile density, but one also obtains two cloths, in particular two carpets which are each other's mirror image and which are technically perfect as far as pile implanting and the ensuing back pattern are concerned. Tufted pile threads are not mixed at the time of the colour selection (Mischkontouren) . The above-described method makes it possible to obtain new weaving patterns and to realize existing weaving patterns faster. The construction of the weaving device is quite simple. The construction of the pile mechanism, consisting of a selection part and a part that doubles in height and forms a mirror image according to figures 7 to 12 is also relatively simple. The above-described manner for inserting weft threads and the possibility which is thus created to keep the so- called filler warp or tension warp, in the example of figure 1 the warp threads 3 of the top cloth 10 and the warp threads 13 of the bottom cloth 11, stationary, whereas a weft thread is simultaneously inserted above and under this tension warp in one and the same cloth offers various advantages: The tension of the warp threads and the thread web formed by them can be easily regulated and the formed sheds are more perfect, as a result of which they can remain smaller so as to allow for a good weft insertion. The immobile filler or tension warp thread web restricts the number of moving shafts. In the case of double-cloth fabrics, in particular carpets or velvet, these warp threads 3 for the top cloth 10 and 13 for the bottom cloth 11 can be kept in position by two stationary shafts, and thus without any cams, levers or any other parts being required for the drive, or even by one single shaft 1 whose heddles have one eye for the top cloth and one eye for the bottom cloth. Even this shaft is not absolutely required, given the presence of "dead" (i.e. inactive) pile threads which function as filling weft. The symmetry of the weaving of double-cloth fabrics makes it possible to simultaneously move the two binding warp webs of the top cloth with the two binding warp thread webs of the bottom cloth as well as twice one warp thread web. Thus, it is possible to move the four warp thread webs by means of only two shafts equipped with two-eyed heddles, for one binding warp of each cloth 10 and 11, (2 and 12) and (4 and 14) , and which move as mirror images during each revolution of the weaving machine. This may be- done by means of levers driven by cams which are opposed during each revolution, such that in a closed movement, if one shaft is pulled up, the other will automatically go down. Since the opposed loads (partly) neutralize each other, a lighter drive is possible. The weft insertion above and under stationary weft threads which may serve as a slide for the weft threads, and the crossing of the binding warp threads around the final locations for weft threads allow for a lighter beat-up of the sley. The fact that at least the filler warp threads and part of the binding warp threads form an acute angle with the two back cloths which should not touch so as to keep the weave pile threads taught allows for a much easier pile formation. The warp thread tensions required for the same goal are-considerably smaller. The stationary straddle of the filler warp threads 3 above and 13 below, which is constantly under the same strain, allows for a continuous unspooling of the corresponding beams, and the forward shift of the weft threads between the alternating binding warp threads is made easier such that the beat-up of the sley may be lighter. This allows for a lighter sley and drive thereof, and the possibility to reach a higher speed. The tensile forces on the warp threads and the cloths may be reduced. There are less breaks. The pile formation can take place at each revolution in each of the two cloths in the double-cloth fabric. The working (selected) pile threads follow opposite directions in pairs (for example 19 from 10 and 119 from 11) . At the first revolution: the rise of a selected hook 29 corresponds to the rise of the pile thread 19, but also to the descent of the pile thread 119. Furthermore, a closed circuit of rising and descending cables can be used as shown in figure 12. In this case, the connections with the pile threads experience a forced motion, both upwards and downwards; these connections may either be metal cables in stationary tubes or even solid rods. As a result, the forces are counterbalanced. The dead pile threads (which, according to the existing weaving methods, do move above and under the shoots and thus load the selecting mechanism) rest during two revolutions on fixed knives 38 according to the new weaving method. Only very shortly before their selection they are lifted a few tenths of a millimetre through the grid 43 (about l/8th of a revolution) . These two results of the weaving method allow for a very light working of the selecting mechanism. The bobbins of the pile thread rack can be doubled: two threads can be wound double on one and the same cylindrical cheese. The brake mechanism per bobbin can remain the same. The tensile force is divided over two threads, so that the risk of breaks is reduced. The dead pile threads remain taught and immobile along the inner side of the filler warp thread web, such that a smaller pile thread consumption can be expected. Also the shed formation is more perfect. The present invention is in no way limited to the embodiments described above; on the contrary, such methods and devices for weaving can be made in various forms and dimensions while still remaining within the scope of the invention.

Claims: Claims 1. Weaving method according to which at least one cloth (10 or 11) is formed by inserting at least one weft of textile material (yarn) (7, 8, 17, 18) between at least two webs of warp threads for the weave (binding warps) or filling (tension or filler warp) (2, 3, 4, 12, 13, 14) forming at least one shed (5, 6, 15 or 16) and by subsequently binding this weft (7, 8, 17, 18) through the closing of this shed (5, 6, 15 or 16) and the beat-up with the reed (9) , characterized in that at least for a number of revolutions for the weft insertion of textile material at least three warp thread webs (2, 3, 4 and/or 12, 13, 14) are formed for one and the same cloth (10 and/or 11) and at least two weft threads (7, 8 and/or 17, 18) are simultaneously presented in at least two sheds (5, 6, 15, 16) formed between the warp thread webs (2, 3, 4, 12, 13, 14) during these weft insertions, at least one in each shed, whereby the two textile weft threads (7, 8 and/or 17, 18) are separately bound. 2. Method according to the above claim, characterized in that a simple pile fabric is made and in that so-called pile-forming wires (22) are used to this end, whereby apart from the three above-mentioned warp thread webs (2, 3, 4) at least a fourth web of pile threads (19, 20, 21, ...) situated in the direction of the warps is required, which for at least a number of revolutions form at least a third shed so as to form at least one layer of pile loops during the closing over the inserted wires (22) , possibly cut when cutting wires are used. 3. Method according to the above claim, characterized in that the selected pile threads are incorporated in the cloth so that the pattern obtained on the pile side by means of the pile loops is also obtained on the back, while the unselected pile threads are bound into the cloth. 4. Method according to the above claim, characterized in that one warp thread web (3) is kept practically stationary. 5. Method according to claim 1, characterized in that a double-cloth pile fabric is woven with simultaneously two cloths (10 and 11) and in that for the above-mentioned weft insertions for the two cloths (10 and 11) at least six warp thread webs (2, 3, 4, 12, 13, 14) are formed, whereby the two middlemost webs can practically coincide, such that four sheds (5, 6, 15, 16) are formed and in that, during these weft insertions at least four weft threads (7, 8, 17, 18) are simultaneously presented, at least one in each shed (5, 6, 15, 16), whereby the four weft threads (7, 8, 17, 18) are separately bound, and pile threads (19, 20, 21, 119, 120) are selected for the pattern and during weft insertion are incorporated in the top cloth (10) and in the bottom cloth (11) so that the pile threads selected form the pattern both on the pile side and on the back, while the unselected pile threads are woven evenly into the pile pattern and the back pattern. 6. Method according to the above claim, characterized in that the top and bottom cloth (10 and 11) are simultaneously woven as perfect mirror images, whereby selected pile threads (19, 20, 21) are made to run from the back of the bottom cloth to the back of the top cloth, and the other selected pile threads (119, 120) vice versa. 7. Method according to any of the above claims, characterized in that at each weft insertion at least two weft threads (7, 8, 17, 18) are inserted, each in its own shed (5, 6 and/or 15, 16) for one and the same cloth (10 or 11) . 8. Method according to any of the above claims, characterized in that for the above-mentioned weft insertions whereby at least two weft threads (7, 8 and/or 17, 18) are inserted in one and the same cloth 10 or 11) three warp thread webs (2, 3, 4 and/or 12, 13, 14) are formed, whereby the middlemost (3 and/or 13) is practically stationary and the other (2, 4 and/or 12, 14) are on top of it and beneath it respectively during the shedding and alternate when the weft threads (7, 8 and/or 17, 18) are bound. 9. Weaving device which contains a mechanism for the formation of a shed (5, 6, 15, 16) and a weft mechanism, characterized in that the mechanism for the formation of a shed is a mechanism which can simultaneously form at least two sheds (5, 6 and/or 15, 16) for the insertion of textile threads for one and the same cloth (10 and/or 11) being woven, whereas the weft mechanism is a mechanism which can simultaneously insert at least two textile weft threads (7, 8 and/or 17, 18) in these sheds (5, 6 and/or 15, 16). 10. Device according to the above claim, characterized in that the mechanism for the simultaneous formation of at least two sheds (5, 6 and/or 15, 16) for one and the same cloth (10 and/or 11) contains three shafts (1) , namely a shaft (1) which is practically standing to support a middlemost warp thread web (3 and/or 13) which remains practically stationary and two shafts (1) moving up and down for two other warp thread webs (2, 4 and/or 12, 14) which are situated on top of and beneath the first respectively and which alternate during the binding. 11. Device according to any of claims 9 and 10, characterized in that the device is a double-cloth weaving device and the mechanism for the formation of sheds is a mechanism to simultaneously form at least four sheds (5, 6, 15, 16), whereas the weft insertion mechanism is a mechanism which can simultaneously insert at least four weft threads (7, 8, 17, 18) in these sheds (5, 6, 15, 16). 12. Device according the above claim, characterized in that the filling and the binding warp thread webs are carried in dobbies (1) with double-eye heddles. 13. Device according to any of claims 9 to 12, characterized in that it contains a pile mechanism for presenting pile threads (19, 20, 21). 14. Device according to claims 11 and 13, characterized in that such a pile mechanism contains a pair of pile threads consisting of a pile thread (19, 20, 21) for the top cloth (10) and a pile thread (119, 120) for the bottom cloth (11) , a pulley mechanism (24) controlled by a selection mechanism (29, 38-43) and a part (29) which, during the selection of the above-mentioned pile threads (19, 20, 21, 119, 120), is moved up and down by said selection mechanism (29, 38-43), whereby the pulley mechanism (24) contains two cable ends with which the two pile threads (19, 119, 20, 120) of the pair are connected and is built such that, due to the movement of the above-mentioned part (29) , one cable end is moved upward whereas the other cable end is moved downward to the same extent. 15. Device according to the above claim, characterized in that the pulley mechanism (24) contains a pulley block (25) suspended on the selection mechanism (29, 38-40) and bearing two wheels (26 and 27) , a first cable (30) running over one of the wheels (26) , one end of which is stationary under this wheel (26) and the other end of which is connected to the heddle eye of one of the pile threads (19, 20, 21), and a second cable (32) running over the other wheel (27) , one end of which is stationary, whereby this second cable (32) runs further over a reverse gear (34) fixed to a fixed grid (33) and mounted above this other wheel (27) with regard to the latter end, and whereby the other end of the second cable (32) is connected to the heddle eye of the other pile thread (119, 120) . 16. Device according to the above claim, characterized in that the first cable (30) is connected to the heddle eye of the pile thread (19, 20) for the top cloth (10) and the second cable (32) is connected to the heddle eye of the pile thread (119, 120) for the bottom cloth (11). 17. Device according to claim 14, characterized in that the first cable (30) and the second cable (32) are each connected by a pull-and push connection (52 and 53 respectively) to the heddle eyes of the pile threads (19, 20, 21, and 119, 120 respectively). 18. Device according to claims 15 and 17, characterized in that the pulley mechanism (24) has a cable section (57) connected at one end (59) to the movable end of the second cable (32) , either directly or via a push-and-pull connection (53) , and at the other end (60) either to the first cable (30) or to the section of the second cable (32) located between the pulley block (24) and the reversing wheel (34) . 19. Device according , to claims 15 and 17, characterized in that the pulley mechanism (24) has a first cable section (56) which is connected at one end (60) to the movable end of the first cable (30, either directly or via a push-and- pull connection (52) , and at the other end to a stationary section (31) , and in between runs over a reversing wheel (54) located underneath the stationary section (31) and stationary with respect to the pulley block (25) and a second cable section (57) which is connected at one end to the movable end of the second cable (32) , either directly or via the pull-and-push connection (53) , and at the other end (60) to the section of the second cable (32) between the reversing wheel (34) and the top wheel (25) of the pulley block (25) , and in between runs over a stationary- mounted reversing wheel (55) , and is connected (in 60) between said reversing wheel (55) and the pulley block (25) to the first cable (30) . 20. Device according to any of claims 9 to 19, characterized in that it contains a selection mechanism for pile threads (19, 20, 21, 119, 120) which contains suspension elements (29) formed by a bar-shaped element (35) , by a hook (36) attached to the bottom of the bar- shaped element and onto which a pulley mechanism (24) is suspended by means of a cable (28) and which is made such that the suspension element (29) naturally tilts over to one side if it is free, and by a hook element (37) mounted at a distance from the top end of the bar-shaped element (35) and protruding at the side of this element, and a stationary support (38) for the suspension elements (29) onto which, for the above-mentioned tilted position, the hook element (37) is suspended, and a knife (39) moving up and down during the weaving, to which the hook element is solidly attached. 21. Device according to the above claim, characterized in that the selection mechanism for solidly attaching the hook element (37) to the movable knife (39) consists of a lever (41 which can be tilted by an electromagnet (42) in order to push the suspension element (29) out of the above-mentioned tilted position into a position in which the hook element (37) can hang on the knife (39) which moves up and down. 22. Device according to any of claims 9 to 21, characterized in that it contains guides (44) for weft insertion organs for the insertion of weft threads (7, 8, 17, 18) which can be moved along the reed (9) of the sley (50) between a position taken when the reed (9) is turned backward and whereby they stretch out through the warp thread webs (2, 3, 4, 12, 13, 14) in the opened sheds (5, 6, 15, 16) and a position which they take at the time of the beat-up of the reed (9) and whereby they are situated under the fabric formed. 23. Device according to the above claim, characterized in that the guides (44) can be shifted up and down parallel to the reed (9) and derive their movement from the movement of the sley (50) . 24. Device according to any of claims 22 and 23, characterized in that the guides (44) are mounted on a beam (45) carried by legs (46) which can be shifted up and down on the legs (47) of the sley (50) , and in that the upward and downward movement of the guides (44) is caused because the beam (45) is connected in a hingeable manner with arms (49) which are mounted in a hingeable manner in a fixed point at a distance from the rotation axis of the sley legs (47) .

Inventors: WAGNER ARMAND, WAGNER, ARMAND
Applicants: BIPALIFIN SA, BIPALIFIN S.A.
Application year: 1992
Main classification: D03D39
IPC codes: D03D39