MXPA99007625A - Weaving reed dent spacing arrangements - Google Patents

Abstract

A weaving reed (3) having a plurality of reed dents (14) fixed in certain positions and which may be located in a reed baulk (6). The reeds may be plain reeds or reeds, with any profile, usable virtually on any loom. The dents are formed of wires and spaces (10) and are variably spaced. The variable spaces are formed by varying the thickness of the wires, the width of the spaces, or a combination thereof to produce fabrics with a desired warp density across the entire width of a given fabric. The reed may produce a consistent warp end density which improves the mechanical properties of a given fabric and also provides virtually consistent air permeability across the width of the finished fabrics. The reed can also produce changes in warp end density in a given fabric for certain desired effects. A rotary type reed (14) and weaving rotor (19) for multiple-shed looms are also disclosed.

Description

PROVISIONS PE SEPARATION OF TEETH OF THE TISSUE INTRODUCTION The present invention is directed to fabric weaving devices and, more particularly, to fabric weaving devices and methods for producing fabrics having previously determined air permeability.

BACKGROUND OF THE INVENTION Combs, rotors for weaving and conventional functional equivalents having a fixed spacing between the teeth produce finished fabrics with variable warp yarn density across the entire width of the fabric excluding any special selvedges. Most fabrics have different variations in the density of the warp yarns along the width of the finished fabrics due to different yarns and processes. In the case of airbag fabrics, there may be densities of warp yarns greater or less towards the edge of the fabric. In the case of lower density towards the edge of the fabric, this is caused by the processes of weaving and finishing, in which the edges of the fabric can stretch more than the middle part of the fabric due to tension and hot. As a result of these factors, the density of the finished fabric varies along its width and, consequently, the center of the fabric is denser. This difference in density can be observed by studying the finished fabric. A finished fabric has a density curve, that is, the density of the warp yarns measured in yarns / centimeter, with an inverted U shape as shown in Figure 2, where there is a higher density in the center of the yarn. finished fabric The actual density of warp yarns varies along the width of the fabric from the left (I) through the center left (Cl) center (C), right center (CD), and on the right ( D) of the fabric. Some fabrics, in particular, certain of those produced for papermaking processes, are subjected to different processing conditions, which result in a density curve opposite to that of the previously discussed fabric. Typically, the edges of these finished papermaking fabrics are denser than the middle. This variation in the density of warp yarns along the entire width of a fabric will affect the mechanical properties of the fabric, especially the air permeability. The air permeability is a function of the density of the fabric (ie the denser the fabric, the lower the air permeability). The density of the fabric is controlled by the density of the warp yarns and by the density of the weft yarns according to the yarns, the fabric, the loom, the finishing processes and other chosen fabric conditions. For example, a typical air bag fabric produced with a conventional comb, which can be simple or profiled, can produce a fabric with a warp density variation along the width of the fabric as shown. in Figure 2. Virtually no variation of the density of the weft yarns under normal conditions. Therefore, the variation of density along the width of a given fabric is caused by the variation of the density of the warp yarns. A typical tooth of the prior art 2 is shown in Figures 1, IA, where a plurality of comb wires 4 are connected at their ends to an upper slat 6 and a lower slat 8. The wires of the comb 4 are separated by the spaces 10. A tooth 12 comprises a wire 4 and an adjacent space 10. A conventional comb wire 4 is shown in Figure IB, while a comb wire with a profile is shown in Figure 1C. Air permeability is a critical property of some industrial fabrics such as airbag fabrics and filtration. In the case of airbag fabrics, manufacturers have used many methods to control air permeability that include the use of calendramiento, coating, impregnation, special fabric designs, special constructions of air bags, wraps and layers of different air permeability, and other methods. These methods can result in: increased costs, limited recyclability in the case of coatings, increased waste, and complicated constructions. Ventilation of the air pockets through the fabric may not be possible due to the variation in air permeability of the fabric and the resulting non-predictable mode of operation. An example of an air bag with ventilation holes is shown in United States Patent No. 5,566,972 to Yoshida et al. Examples of air bags having several sections of fabrics with different air permeability are shown in U.S. Patent No. 5,375,878 to N. Ellerbrook, and U.S. Patent No. 5,566,434 to A. . Beasley. Another method for making fabrics for air bags is to use special yarns to weave a fabric of low air permeability saving the need for coating or other processes, as seen in U.S. Patent No. 5,474,836 to Nishimura and collaborators, and U.S. Patent No. 5,508,073 to Krummheuer et al. The present invention can improve this fabric by providing virtually no variation of air permeability along the width of the fabric and can possibly reduce the waste of fabric in the process of manufacturing an air pocket. The present invention can also provide a variable density airbag fabric, which, after construction of the airbag, can result in more uniform air permeability at maximum deployment. A non-uniform product may result, such as in the case of fabrics for making paper, from variations in the fabric. Examples of fabrics for making paper are shown in U.S. Patent No. 4,649,964 to R. W. Smith and U.S. Patent No. 4,588,632 to Gisbourne et al. The present invention can provide a uniform fabric. A fabric having a differential density is shown in U.S. Patent No. 4,698,276 to Duval et al, which is an example of a decorative fabric used to produce draperies. The present invention can produce a fabric that can be convenient for this use while at the same time saving the need for a complicated construction provided by the assembly of fabric strips with various densities of fabric. In addition, a fabric of varying densities may be convenient for the airbag fabric whereby these densities, when predetermined, could cause controlled deflation of the airbag by, for example, using a higher density where the fabric it is stretched more and a lower density where the fabric stretches less to produce, in effect, less or possibly no variation in air permeability. Comb devices that do not perform vigorous blow functions are shown, for example in U.S. Patent No. 5,368,076 for F.H. Curzio. This comb is actually a warp guide device but is designed to affect the density of the warp yarns in web-like, loose-knit fabrics. These fabrics are intended to act as a reinforcing fabric for composite materials to cover three-dimensional mandrels. This comb is of a different design peculiar to making web fabrics where consistent air permeability is not a factor. The comb is shaped to make fabrics for a three-dimensional mandrel. Furthermore, this comb design could not perform the functions of the present invention. Other comb designs include combs with adjustable or removable teeth such as those depicted in U.S. Pat. No. 5, 029,617 for Anderson et al. The Anderson comb can not correct the density variation of the warp yarns as the present invention does due to the separate relationship of the teeth. Regardless of how far apart the teeth are in the removable tooth comb, it could not offer the warp yarn variation control available in the present invention. Each adjacent tooth wire and the removal thereof in this removable tooth comb would avoid providing the desired separation necessary to produce the fabrics produced by the present invention. Combs with adjustable or removable teeth are generally used to insert a larger warp yarn, perhaps to effect a change in the appearance of a decorative fabric, provide a certain selvage, or provide reinforcement in an industrial fabric. In addition, these combs are also used to facilitate maintenance, since a damaged wire can be easily replaced. The adjustable comb can, for example, be used to produce web-shaped fabrics of a variety of shapes, as seen in United States Patent No. 4,465,762 to GL Farley. U.S. Patent No. 5,158,116 to Kazuo et al., By which tooth separation varies to accommodate coarse threads to facilitate the weaving process.

BRIEF COMPENDIUM OF THE INVENTION The present invention relates to knitting devices having knitting elements such as combs, disks, and sheets or elements of similar operation. These devices may include conventional teeth, rotating teeth, and tissue rotors such as those used in multiple shed weaving machines. More particularly, the present invention relates to a comb for weaving with a construction so that the density variation of the warp yarns is controlled, or the density of the warp yarns can be changed, over the entire width of the cloth. In addition, the present invention will affect the mechanical properties of the fabric. One embodiment of this invention and a quality of this fabric produced by it includes virtually no variation of air permeability through the entire width of the finished fabric. Alternatively, other embodiments of this invention can produce changes in the density of the warp yarns of a given fabric depending on the spacing of the teeth of the comb or the separation of groups of teeth chosen for a desired effect. The present invention, which utilizes a variable-spaced tooth comb, will be useful in any application that requires a fabric with virtually no variation, or produce a desired predetermined change, in the density of the warp yarns. A fabric produced by the present invention with this comb is suitable, in particular, for fabric for uncoated air bags. The present invention may also offer a new fabric which is composed of different densities of warp yarns in selected areas of the fabric which may alternatively be in the service of, for example, fabric assemblies for air bags.

DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic plan view of a conventional tooth of the prior art with fixed tooth spacings. Figure IA is a schematic enlarged plan view of a portion of the wires and comb spaces of the comb of Figure 1. Figure IB is a schematic side elevational view of a single comb wire of the comb of Figure 1. Figure 1C is a schematic side elevational view of a comb wire of the comb profile of Figure 1. Figure 2 is a schematic graphical representation of the variations in warp yarn density across the width of a pouch fabric. woven air typical of the prior art. Figure 3 is a schematic graphic representation of the air permeability along the width of the prior art woven air bag fabric of Figure 2. Figure 4 is a schematic graphic representation of the measured tooth spacing. by the gauge of the comb along the comb according to the present invention. Figure 5 is a schematic graphical representation of the air permeability along the length of a woven fabric using the comb having the tooth spacing of Figure 4. Figure 6 is a schematic plan view of an embodiment of a comb according to the present invention. Figure 6A is a schematic enlarged plan view of a portion of the wires and comb spaces of the comb of Figure 6. Figure 7 is a schematic plan view of another embodiment of a comb according to the present invention. Figure 7A is a schematic enlarged plan view of a portion of the wires and comb spaces of the comb of Figure 7. Figure 8 is a schematic plan view of another embodiment of a comb according to the present invention. Figure 8A is a schematic enlarged plan view of a portion of the wires and comb separations of the comb of Figure 8. Figure 9 is a schematic graphical representation of another embodiment of a comb according to the present invention showing the Separation of groups of teeth along the length of the comb as depicted in Figure 4. Figure 10 is a schematic graphical representation of another embodiment of a comb according to the present invention showing the separation of groups of teeth along the length of the comb as depicted in Figure 4. Figure 11 is a representation schematic graph of tooth separation for a comb according to an embodiment of the present invention which produces a non-uniform air permeability across the width of a fabric. Figure 12 is a schematic graphical representation of the air permeability along the width of a fabric using the tooth spacing of Figure 11. Figure 13 is a schematic graphic representation of the tooth spacing of a comb according to FIG. with another embodiment of the present invention which produces a non-uniform air permeability across the width of the fabric. Figure 14 is a graphical representation of the air permeability across the width of a fabric using the tooth spacing of Figure 13. Figure 15 is a schematic graphic representation of a tooth spacing for a comb in accordance with FIG. Another embodiment of the present invention which produces a non-uniform air permeability across the width of a fabric.

Figure 16 is a schematic graphical representation of the air permeability across the width of a fabric using the tooth spacing of Figure 15. Figure 17 is a schematic graphic representation of the tooth spacing of a comb according to Another embodiment of the present invention which produces a non-uniform air permeability across the width of a fabric. Figure 18 is a schematic graphical representation of the air permeability across the width of a fabric using the tooth spacing of Figure 17. Figure 19 is a schematic perspective view of another embodiment of the present invention having a rotary type comb. Figure 20 is a schematic representation of the embodiment of Figure 19. Figure 21 is a schematic plan view of another embodiment of the present invention having a rotor for weaving. Figure 22 is a schematic front elevated view of the knitting rotor of Figure 21. Figure 23 is a schematic side elevational view of the knitting rotor of Figure 21.

» DETAILED DESCRIPTION OF THE INVENTION In accordance with the foregoing, one embodiment of the present invention is to provide a comb for weaving which can produce improved fabrics by controlling the variation of the warp yarn density across the entire width of the fabric. finished However, a complete study of the variation of the density of warp yarns through the width of the finished fabric produced by a conventional fixed tooth comb of the prior art (see Figs. 1-1C, 2, 3), it is vital for the successful implementation of this invention in a given fabric. Figures 2 and 3 depict a typical woven fabric of the prior art, for example a 630 denier high tenacity nylon air bag fabric with a density nominal 41x41 threads / 2.54 cm. The density of warp yarns across the width of the prior art fabric is shown by the curve shown in Figure 2. In this example the density between warp yarns of the fabric is about 16.8 yarns / cm in diameter. the center of the cloth while only about 14.76 threads / centimeter at the edges of the fabric. This density of warp yarns will give the fabric the variation of air permeability across the width of the fabric following the curve shown in Figure 3, which shows the permeability to the air in the center of the cloth that is approximately 0.226 cubic meters / minute (to 124 pascals) while it is approximately 0.362 cubic meters / minute (to 124 pascals) towards the edges. A preferred embodiment of this invention, although it is not limited to any particular comb or gauge type comb construction (also called step or count and measure in teeth / centimeters), it is a simple comb, or a comb that has any profile or functional equivalents, for its use in virtually any type of loom, which is composed of comb elements that have variable tooth spacing when required, which can be carried out by the following example constructions. The present invention may have comb elements such as fixed wires and variable spacings between the wires to achieve variable spaced teeth, as seen in Figures 6, 6A. Alternatively, the present invention may have fixed spaces between wires and variable wire thicknesses to achieve variable spaced teeth, as shown in Figures 7, 7A. Still alternatively, the present invention can have a combination of variable wire spacings and variable wire thicknesses to achieve variable spaced teeth, as seen in FIGS. 8, 8A. Functional equivalents such as rotating combs and weaving rotors may have related parts that require adjustment to achieve the new separations provided by the constructions described in this specification. The aforementioned constructions of the present invention, in certain preferred embodiments, produce a finished fabric with virtually consistent warp yarn density across the width of the fabric. In effect, the variation of the warp yarn density across the width of the finished fabric is adjusted during weaving by the present invention. To correct the density variation of warp yarns across the width of the prior art fabric shown in Figure 2, the present invention is designed with variable tooth spacing along the entire length of the comb. The gauge of the comb in teeth per centimeter is depicted graphically in Figure 4. The gauge of the comb at both ends of the comb is approximately 16. 7 teeth / centimeter based on tooth separation (which is the thickness of one wire plus the width of an adjacent clearing) of approximately 0.0597 centimeters. The middle part of the comb has a tooth spacing of approximately 0.0716 centimeters, producing a comb gauge of approximately 13.97 teeth / centimeter. This comb will produce a fabric with consistent warp yarn density which will give this fabric a uniform air permeability across the width of the fabric following the curve shown in Figure 5. Possible constructions to achieve this variable separation of teeth are depicted in Figures 6-8. Figure 6A is an enlarged view showing the first 8 teeth of the left selvage of the comb 2 of Figure 6. The modality shown in Figures 6, 6A shows variable tooth separations which are achieved by having wires 4 of fixed thickness (for this example the wires 4 have a thickness of 0.0254 centimeters), and the spaces 10 of variable width. The space 10 on the first tooth 26 is 0.0343 centimeters in width which provides a total tooth spacing for tooth 26 of 0.0597 centimeters. The space 10 between adjacent wires 4 increases in increments of 0.00025 centimeters progressively along the comb 2 to a maximum amount at a desired point, from which the spaces 10 begin to decrease by the same amount, which is illustrated more clearly in the graph of Figure 4 showing the comb gauge resulting from this tooth separation. The space 10 between the wires 4 on the eighth tooth 27 is 0.0361 centimeters which will give a total separation of teeth 10 for the eighth tooth 27 of 0.0614 centimeters. Another embodiment is shown in Figures 7, 7A, where a comb 2 of the present invention is shown with variable tooth spacing achieved having fixed spaces 10 (0.0343 centimeters in this example) between adjacent wires 4 which have varying wire thickness . In the illustrated embodiment, the thickness of the wire 4 on the first tooth 28 is approximately 0.0254 centimeters. This will give a total tooth separation for the first tooth 28 of 0.0597 centimeters. In a manner similar to Figures 6, 6A, the thickness of the wires 4 is increased by increments of 0.00025 centimeters progressively along the comb 2 to a maximum thickness at a desired point from which the thickness begins to decrease at the same rate . The actual wire thickness in the eighth tooth 29 is 0.0272 centimeters which gives a total tooth separation for the eighth tooth 29 of 0.0614 centimeters. Figures 8, 8A represent another embodiment of a comb of the present invention with variable tooth spacing achieved by combining variable thicknesses of wires 4 and varying widths of gaps 10. The dimensions of the construction of the first 8 teeth are as follows: first tooth 30 has a wire thickness 4 of 0.0262 cm and a width of clearance 10 of 0.0335 cm, for a total separation for the first tooth 30 of 0.0597 cm. The second tooth 31 has a wire thickness 4 of 0.0254 cm and a width of clearance 10 of 0.0345 cm, for a total separation for the second tooth 31 of 0.0599 cm. The third tooth 32 has a wire thickness 4 of 0.0254 cm and a width of clearance 10 of 0.0348 cm, for a total separation for the third tooth 32 of 0.0602 cm. The fourth tooth 33 has a wire thickness 4 of 0.0246 cm and a width of clearance 10 of 0.0340 cm, for a total separation for the fourth tooth 33 of 0.0604. The fifth tooth 34 has a thickness of wire 4 of 0.0267 cm and a width of clearance 10 of 0.0340 cm, for a total separation for the fifth tooth 34 of 0-0607. The sixth tooth 35 has a wire thickness 4 of 0.0269 cm and a width of clearance 10 of 0.0340 cm, for a total separation for the sixth tooth 35 of 0.0609 cm. The seventh tooth 36 has a wire thickness 4 of 0.0264 cm and a width of 10 clear of 0.0348 cm, for a total separation for the seventh tooth 36 of 0.0-612 cm. The eighth tooth 37 has a wire thickness 4 of 0.0272 cm and a width of clearance 10 of 0.0343 cm, for a total separation for the eighth tooth 37 of 0.0614 cm. The aforementioned dimensions are shown only to illustrate the works of the present invention and should be adjusted according to the desired result in a given fabric. The aforementioned example of comb tooth dimensions almost perfectly correct the curve shown in Figure 2. The present invention can be simplified as depicted in Figure 9, which graphically represents the comb gauge in teeth / centimeter at length of the width of a fabric of a tooth of another preferred embodiment of the present invention having groups of teeth. In this mode, the entire length of the comb is divided into 27 groups of teeth, that is, a wire 4 and a clear 10, where the separation of teeth from each tooth in a group is the same but different from the separation of teeth. at least its adjacent groups. Although the result will not be as perfect as that which can be achieved with the combs represented in the embodiments of Figures 6, 6A, 7, 7A or 8, 8A, it will serve well for most practical purposes. The separations of specific teeth of the groups of this modality are the following: the group of teeth 40 has 0.0609 cm, the group of teeth 41 has 0.0614 cm, the group of teeth 42 has 0.0622 cm, the group of teeth 43 has 0.0629 cm, the group of teeth 44 has 0.0640 cm, the group of teeth 45 has 0.0647 cm, the group of teeth 46 has 0.0655 cm, the group of teeth 47 has 0.0663 cm, the group of teeth 48 has 0.0673 cm, the group of teeth 49 has 0.0680 cm, group of teeth 50 has 0.0690 cm, group of teeth 51 has 0.0701 cm, group of teeth 52 has 0.0711 cm, group of teeth 53 has 0.0701 cm, group of teeth 54 has 0.0690 cm , the group of teeth 55 has 0.0680 cm, the group of teeth 56 has 0.0673 cm, the group of teeth 57 has 0.0663 cm, the group of teeth 58 has 0.0655 cm, the group of teeth 59 has 0.0647 cm, the group of teeth 60 has 0.0640 cm, group of teeth 61 has 0.0629 cm, group of teeth 62 has e 0.0622 cm, the group of teeth 63 is 0.0614 cm, the group of teeth 64 is 0.0609 cm, the group of teeth 65 is 0.0602 cm, and the group of teeth 66 is 0.0594 cm. The present invention can be further simplified with other groups of teeth as shown in the embodiment of Figure 10. In this embodiment the entire length of the comb is divided into 14 groups of teeth. In a manner similar to the embodiment of Figure 9, the separation of the teeth within each group is the same, but the separation of each group is different from at least its adjacent groups: the group of teeth 70 is 0.0609 cm, the group of teeth 71 has 0.0622 cm, group of teeth 72 has 0.0640 cm, group of teeth 73 has 0.0655 cm, group of teeth 74 has 0.0673 cm, group of teeth 75 has 0.0690 cm, group of teeth 76 has 0.0711 cm, the group of teeth 77 has 0.0690 cm, the group of teeth 78 has 0.0673 cm, the group of teeth 79 has 0.0655 cm, the group of teeth 80 has 0.0640 cm, the group of teeth 81 has 0.0622 cm, the group of teeth 82 is 0.0609 cm, and group of teeth 83 is 0.0594 cm. Both simplified combs depicted in Figures 9, 10 can be designed by varying the thickness of the tissue element, ie, the comb wire, the rotary comb disk, or the sheets in a rotor thickness for weaving, or varying the width of the clearings by a combination of these two. This variable thickness of wire and width of the clear is not necessarily variable entirely across the length of the comb in order to provide a certain amount of correction to the variation in the density of the warp yarns. The rotating combs and the rotors for weaving may have related parts used together with them which may be adjusted to match new separations provided by the constructions described in this specification. To correct larger variations in the density of the warp threads of the finished fabric smaller clusters of teeth can be used, ie (fewer teeth per group). To correct minor variations in the density of the warp yarns of the finished fabric, larger groupings can be used (ie more teeth per group). Ideally, the tooth assemblies are adjusted so that the density curve of warp yarns closely matches enough for practical use of the finished fabric. Matching the density curve of the warp yarns with precision is not necessary for most applications since an approximate match to the curve will provide an adequate correction. As a rule, the simpler the design (fewer groupings), the present invention will be less able to correct the variation of warp yarn density across the width of the finished fabric. Therefore, a complete understanding of the actual variation of the warp yarn density of any finished fabric and its end-use application will determine the complexity of the present invention. The present invention can also produce a fabric having non-uniform air permeability. Another embodiment of the present invention is depicted in Figure 11, which shows the comb gauge distribution for a comb that produces a fabric having a non-uniform air permeability distribution as shown in Figure 12. As can be seen in FIG. see, the distribution of this modality comprises three uniform air permeability segments, with non-uniform air permeability transition segments between adjacent segments. The two segments on the outer edges, that is, the left and right portions, of the fabric have an air permeability less than a third segment, that is, the central portion, and are substantially equal to each other. The central portion of the fabric has a constant air permeability which is greater than that of the two segments on the outer edges. There are two transition segments, each having an inclined distribution of air permeability between an outer segment and the segment of the central portion. The embodiment shown in Figure 13 shows the distribution of the comb gauge for a comb that produces a fabric having a non-uniform air permeability distribution as shown in Figure 14. As can be seen, this distribution comprises three segments larger ones having curved distributions, or substantially non-deep U-shaped, with sharp transitions, or cuts, between each segment. The outer segments have an air permeability generally lower than the central segment, with the lower air permeability at the center of the segment and the greater air permeability at the outer edges of the segments. The central segment also has its lowest air permeability at its center and its largest air permeability at its outer edges. The embodiment shown in Figure 15 shows the distribution of the comb gauge for a comb that produces a fabric having a non-uniform air permeability distribution as shown in Figure 16. The air permeability of this mode follows a curve stepped, with alternative segments of air permeability higher and then lower. The embodiment shown in Figure 17 shows the distribution of comb gauges for a comb that produces a cloth having a non-uniform air permeability distribution as shown in Figure 18. The air permeability of this mode follows a sinuous curve. , where the air permeability distribution ripples from a higher air permeability to a lower to a higher air permeability. The specific tooth spacings required for the modalities of Figures 11-18 are not shown here since it would be impractical due to the number required. However, enough details are shown here, in combination with the above discussion with respect to the combs that produce uniform air permeability, to allow a person with experience in the technique to build combs that have these characteristics. The curves represented in these graphs were derived from the curve shown in Figure 3. The dimensions used for these variable separation combs and their effect on air permeability across the width of the fabric are shown only to illustrate the works of the present invention and should be adjusted according to the desired result in a given fabric. The thicknesses of the discs and the spacing between two discs in a rotary comb and the thickness of sheets in the rotors for weaving and related parts for multiple shed weaving machines can be designed in accordance with the teachings provided herein to produce fabrics with density of uniform warp yarns, or for a desired effect, across the width of a finished fabric. Another embodiment of the present invention having a rotating comb is shown in perspective in Figure 19 and in a plan view in Figure 20. Comb 2 'has stationary comb wires 4"separated by spaces 10 and a rotating comb. 14. The rotary comb 14 comprises the arrow 16 which supports the discs 18 which are separated by the spaces 10 'The teeth 12 are formed from a comb wire 4"and a space 10, while the teeth 12' are formed of a disk 18 and a space 10 '. The comb 2 'could, when modified in a manner similar to that described herein, form a fabric having a desired warp yarn density. In a manner similar to that described above with respect to Figures 6-8, the separation of the teeth can be made non-uniform by varying the thickness of the wires of the comb 4"and the discs 18, the width of the openings 10, 10 ', or a combination of the two A detailed example is not necessary here, as the examples illustrated above with respect to Figures 6-8 are sufficient to demonstrate the principle with respect to this embodiment Another embodiment of the present invention which has a rotor for weaving is shown in Figures 21-23, the weaving rotor 19 has a plurality of sheets 22 separated by the spaces 10 and supported on the rotor 23. The teeth 12"of a sheet 22 and a sheet 22 are formed. space 10. The warp yarns 24, and the weft yarns 25, as seen in Figure 23, run through the sheets 22. In a manner similar to that described above with respect to Figure 6-8. , the separation of the teeth can be non-uniform thickness by varying the thickness of the sheets 22, the width of the spaces 10 or a combination of the two. A detailed example is not needed here since the examples illustrated with respect to Figures 6-8 are sufficient to demonstrate the principle with respect to this embodiment. It is an established practice in the art of weaving to spread different numbers of warp threads through a tooth. For example, one thread per tooth, two threads per tooth, three threads per tooth, etc. Another practice is to skip one tooth and not another, for example skip a tooth of two, skip a tooth in three, skip two teeth in three, two teeth in four, etc. Therefore, this practice, when applied to the present invention, will produce a uniform fabric, although the density of warp yarns will be different according to how many warp threads are inserted through each of the teeth. Regardless of this practice, it is still possible with the present invention to produce a uniform air permeability over a given area due to the uniformity of the finished fabric. The present invention with the combs illustrated herein, or a rotary comb and its related parts, or a tissue rotor and its related parts for multiple shed looms, which use the principles of these constructions, with separations and / or wires ( or discs or sheets) with suitable thicknesses for the yarn and the given conditions, can be used to adapt for this practice.

Any change in yarns, fabrics, weaving conditions, termination processes and termination conditions will affect the distribution of warp yarn density across the entire width of the finished fabric. Therefore, any of these changes requires a complete study of the density distribution of the warp yarns across the entire width of the finished fabric. The result of this study is required to design the comb with varyingly spaced teeth using variable wires (or disks or related parts such as in the case of a rotary comb or sheets and related parts for a rotor to weave) in the thickness and / or separation variable between the wires (or discs or plates, and related parts), to adjust for the change. The rotating combs and the rotors for weaving may have related parts used together with them that must be adjusted to match the new separations provided by the constructions described in this specification. Of course, many permutations of the present invention are possible in view of the above teachings. It will therefore be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described. It is understood herein that the term wire used to describe the member used together with a space for understanding a tooth may be a member of another material or materials. These wires, if they have enough resistance to support the batting without support both in the upper part and in the lower part, can avoid the need for an upper or lower batten. The rotating combs and the rotors for weaving may have related parts used together with them which must be adjusted to match the new spaces provided by the constructions described in this specification.

Claims (26)

1. A device for weaving a fabric, comprising, in combination: a plurality of knitting elements, each knitting element being separated from the adjacent knitting elements by a space; a plurality of teeth, each tooth comprising a knitting element and an adjacent space, wherein at least one of the teeth has a width different from the width of the other teeth, providing a substantially uniform air permeability within each discrete portion of the width of the finished fabric woven into the device.

2. The device according to the claim 1, wherein the finished fabric woven in the device has a substantially uniform air permeability across its width. The device according to claim 1, wherein the tissue elements comprise comb wires. The device according to claim 3, wherein each comb wire has substantially the same thickness as each of the other comb wires and at least one space is of different width than at least one other space. The device according to claim 3, wherein each space has substantially the same width of each space and at least one comb wire has a different thickness from at least one other comb wire. The device according to claim 3, wherein at least one space is of a different width than at least one other space and at least one comb wire has a different thickness than at least one other comb wire. The device according to claim 3, further comprising a plurality of groups of teeth, each group of teeth comprising a plurality of comb wires and the corresponding spaces, the width of each tooth being in a group of teeth substantially same as the width of the other teeth in the group and different from the width of the teeth of at least one of the other groups of teeth. The device according to claim 1, wherein the elements for weaving comprise wires and comb discs. The device according to claim 8, wherein each comb wire has substantially the same thickness as each of the other comb wires, each disc having substantially the same thickness as each of the other discs, and at least a space is of different width than at least another space. The device according to claim 8, wherein each space has substantially the same width as each of the other spaces, at least one of the comb wires has a thickness different from the thickness of at least one other comb wire, and at least one of the discs has a thickness different from the thickness of at least one other disc. 11. The device according to the claim 8, wherein at least one space is of a different width than at least one other space, at least one comb wire has a different thickness than at least one other comb wire, and at least one of the disks has a different thickness of thickness of at least one other disc. The device according to claim 8, further comprising a plurality of groups of teeth, each group of teeth comprising a plurality of comb wires and corresponding spaces, and a plurality of discs and corresponding spaces, the width of each tooth in a group of teeth is substantially the same as the width of other teeth in the group and different from the width of the teeth of at least one of the other groups of teeth. The device according to claim 1, wherein the tissue elements comprise sheets. The device according to claim 13, wherein each sheet has substantially the same thickness as each of the other sheets, and at least one space is of different width than at least one other space. The device according to claim 13, wherein each space has substantially the same width as each of the other spaces and at least one sheet has a thickness different from the thickness of at least one other sheet. The device according to claim 13, wherein at least one space is of different width than at least one other space, and at least one sheet has a thickness different from the thickness of at least one other sheet. 17. The device according to the claim 13, which further comprises a plurality of groups of teeth, each group of teeth having a plurality of corresponding sheets and spaces, the width of each tooth being in a group of teeth substantially the same as the width of the other teeth in the group and different from the width of the teeth of at least one of the other groups of teeth. The device according to claim 1, wherein the air permeability across the width of a finished fabric woven in the device has a distribution substantially equal to the distribution of the graph of Figure 16. 19. A device for knitting fabrics for air bags, comprising, in combination: a plurality of knitting elements, each knitting element being separated from the adjacent knitting elements by a space; a plurality of teeth, each tooth comprising a knitting element and an adjacent space, wherein at least one of the teeth has a width different from the width of other teeth so that a finished woven fabric in the comb has substantially permeability to the tooth. uniform air across its width. A device for weaving a fabric, comprising, in combination: a plurality of comb wires, each comb wire being separated from the adjacent comb wires by a space; a plurality of teeth, each tooth comprising a comb wire 'and an adjacent space, wherein at least one of the teeth has a width different from the width of other teeth, providing a substantially uniform air permeability within each discrete portion of the tooth. a width of a finished fabric woven into the device. 21. A device for weaving a fabric, comprising, in combination: a plurality of comb wires, each comb wire being separated from the adjacent comb wires by a space, - a plurality of disks, each disk being separated from the adjacent discs by a space a plurality of teeth comprising each tooth one of a comb wire and a disc, and an adjacent space, wherein at least one of the teeth has a width different from the width of the other teeth, providing a permeability to substantially uniform air within each of the discrete portions of a width of a finished fabric woven into the device. 22. A device for weaving a fabric, comprising, in combination: a plurality of sheets, each sheet being separated from the adjacent sheets by a space; a plurality of teeth, each tooth comprising a sheet and an adjacent space, wherein at least one of the teeth has a width different from the width of the other teeth, providing a substantially uniform air permeability within each of the portions discrete of a width of a finished fabric woven into the device. 2

3. A method for producing a fabric comprising, in combination, the following steps: providing a knitting device having a plurality of teeth, each tooth comprising knitting elements and an adjacent space; varying the width of at least one of the teeth to provide substantially uniform air permeability within each discrete portion of a width of a finished fabric woven into the device. The method according to claim 23, wherein the step of varying the width of at least one of the teeth comprises varying the thickness of at least one of the knitting elements. The method according to claim 23, wherein the step for varying the width of at least one of the teeth comprises varying the width of at least one of the spaces. 26. The method according to claim 23 wherein the step of varying the width of at least one of the teeth comprises varying the width of at least one of the spaces and varying the thickness of at least one of the knitting elements.