Reed, and process for manufacturing a reed

Abstract

In recent years, more and more new fields of application for woven fabrics have become available, e.g. as a filter medium. Satisfying the requirements for such applications requires very fine woven fabrics that can be manufactured only by means of reeds having an accordingly small pitch. When manufacturing such reeds, the small distances between the dents of the reeds have an influence on physical effects, e.g. capillarity, which could be disregarded until now when manufacturing reeds having larger pitches. The aim of the invention is to specify a reed having a pitch of no more than 1 / 8 mm and a process for manufacturing same, taking into account these specificities.

Description

[0001] Weaving machines have been known since the 17th century. Since then, weaving machine technology has evolved significantly. Over time, this has made it possible to produce ever finer fabrics with increasing precision. The basic functioning of weaving machines and the weaving process, however, has remained unchanged and will not be described in detail here; rather, it is assumed to be known. The reed of the weaving machine has had a major influence on the development of weaving machines. A reed usually consists of a large number of teeth that are arranged next to one another in a width direction and maintained at a uniform distance. This spacing creates a tooth space between adjacent teeth in the direction of the machine width. During weaving, the warp threads are guided in these tooth spaces.The reed therefore has a direct influence on the positioning of the warp threads in the width direction of the loom and thus also on the position of the warp threads in the final fabric. Irregularities in the reed therefore lead to irregularities (e.g. stripes) in the fabric produced during weaving. A characteristic value of reeds is their pitch, which is the sum of the width of a tooth and the width of the space between the teeth. The pitch describes how closely (finely) the teeth or spaces between the teeth are arranged and accordingly how fine the fabric to be produced with the reed will be. Although the basic structure of reeds has hardly changed for centuries, design changes have nevertheless been made, often aimed at enabling more economical and / or more precise reed production.While the teeth of earlier reeds were made of reeds, they were quickly manufactured from a metal strip, whereby the finer the reeds, the thinner the metal strip, the more the teeth had to be made. Nowadays, reeds often have small pitches of 80 teeth per centimeter or more. The metal strip from which the teeth are made is therefore so thin that it is very flexible and can be described more as a metal foil. For reeds with a coarse pitch, it is already known to bind the teeth together with a thread, e.g. a cotton yarn, and profile rods (usually half-round rods) running in the width direction. The thread has the function, on the one hand, of adjusting the distance between adjacent teeth, so that the desired inter-tooth space is achieved. On the other hand, binding with the thread serves to create a pattern for subsequent production steps (e.g.Gluing the reed) to create a sufficiently strong connection between the teeth and the profile bars.

[0002] GB727546A shows such a reed bound with a cotton yarn. Half-round rods are arranged in the end regions of the teeth of this reed, with the teeth being enclosed between two half-round rods arranged opposite one another in height. The cotton yarn is wound spirally around two opposite, paired half-round rods, with one turn of the spirally wound cotton yarn running between adjacent teeth of the reed, thus ensuring spacing between adjacent teeth. To create a strong bond between the teeth and the half-round rods, the cotton yarn was usually soaked in pitch at the time. After the reed was bound, the pitch hardened into a solid mass to create a strong bond between the components of the reed.

[0003] DE2428097 describes a method for manufacturing a weaving reed in which the weaving reed is bound with a nylon yarn instead of a metallic wire. The nylon yarn should not influence the spacing of the teeth of the weaving reed. To this end, the nylon yarn should be a slightly twisted nylon yarn that offers little or no resistance to deformation in its cross-section. Rather, the teeth are precisely positioned in their final position by a suitable machine during the manufacturing process. The nylon yarn is elastic and is wound under pretension around the profile bars (rails) of the weaving reed so that the profile bars clamp the teeth in their final position. This clamping is intended to prevent the teeth from slipping. The teeth are then glued together in a known manner – usually in a U-profile.During bonding, a viscous adhesive is applied between the teeth of the reed, exerting capillary forces on the teeth. A disadvantage of this process is that these capillary forces can cause deformation and / or uneven displacement of the teeth in the bonded area. This effect is more pronounced the smaller the spacing between the teeth and the thinner the teeth themselves—especially in reeds with a small pitch. The nylon yarn described in DE2428097 cannot counteract this due to its low resistance to deformation and is therefore not suitable for reeds with a small pitch.

[0004] Similar problems arise with the weaving reed disclosed in GB693629A. The weaving reed described there is bound with a thermoplastic yarn. The weaving reed has teeth that extend predominantly in their longitudinal direction and are arranged next to one another in their width direction, forming a tooth gap. The teeth each have two end faces that delimit the respective tooth in its vertical direction and are spaced apart from one another in this vertical direction. Two profile bars, which lie opposite one another in pairs in the vertical direction, form a functional pair and bear against the at least two end faces. A textile yarn with a plurality of filaments wraps around the at least two opposing profile bars as a binding agent and draws them towards one another, wherein the binding agent runs at least partially in the tooth gap between the teeth.However, the teeth, yarn, and profile bars are not bonded together by casting them together with an adhesive, but rather by softening the thermoplastic yarn and then curing it. During softening, the yarn loses its pretension and strength and can be deformed between the teeth of the reed. It can no longer secure the relative position of the teeth. Uniform spacing between the individual teeth of the reed cannot be guaranteed.

[0005] The increasing demands on the precision of the reeds and the production of ever finer reeds led to the use of metallic wire instead of yarn to bind the reeds. The CA2130760C, for example, shows a reed bound with metallic wire. After binding, the ends of the teeth are inserted into the open sides of U-profiles and glued into these U-profiles with a casting compound or adhesive to create a strong connection between the individual components of the reed. By using thin wires instead of cotton yarn, smaller gaps between the teeth could be created. A disadvantage of this technique, however, is that the thickness of the wires must correspond to the required gap between the teeth. A reed manufacturer must therefore have the right wire in stock for every desired gap between the teeth of reeds.Furthermore, the manufacturing tolerances of metallic wires that are common today, particularly in the production of very fine reeds (more than 80 teeth / cm, or pitches of less than an eighth of a millimeter), i.e. reeds with a very small distance between the individual teeth, lead to inaccuracies in the reeds and consequently also in the fabric produced with them. For example, a wire that is too large in diameter leads to too large a distance between adjacent teeth. Across the large number of teeth on a reed, these spacing errors accumulate, so that the reed is ultimately too large. However, a reed that is too large cannot be used in a weaving machine. Therefore, there have already been attempts in the past to further develop this technology.

[0006] In recent years, new fields of application for fabrics have emerged – for example, as filter media. WO2017060765A2 describes the requirements placed on fabrics for such applications ("synthetic monofilament precision fabric"): a very uniform fabric with uniformly large thread spacing is required so that the fabric exhibits the required properties at every point. To meet the requirements of these applications, fabrics with very small pitches are also required. For example, WO2020115625 describes a fabric for a diesel filter that is suitable for filtering water from a diesel-water mixture. For this purpose, fabrics woven from a yarn with a yarn diameter between 10 µm and 90 µm and a grid spacing between 5 µm and 150 µm are used. To produce such fabrics, reeds with pitches of 15 µm to 240 µm are required.Another example of a new application field for fine fabrics is described in WO2019025885A1. Here, the fabric is used as a water- or air-permeable seal against dust (solid particles) for a loudspeaker in a smartphone. Such a fabric also requires reeds with small pitches of 20 µm to 300 µm. Further examples are disclosed in WO2011132062A1 and EP3219837A1. However, the reeds described in the preceding paragraphs are not suitable for producing such fine fabrics while maintaining the required fabric uniformity. The following section discusses the state of the art, which attempts to specify suitable reeds for producing such fine fabrics.

[0007] EP3425096A1, in sections

[0002] to

[0015] , describes in detail the current state of the art, particularly with regard to reeds with a small pitch. To implement small pitches, the teeth of the reeds have a small thickness, which can be less than 0.1 mm. It is also described that such teeth exhibit high flexibility due to their small thickness. This flexibility of the teeth complicates the production of reeds with a small pitch due to handling problems.

[0008] In addition, the previously mentioned capillary forces that act between the teeth when a reed is glued together increase. Since the thickness of the teeth is quadratically included in the formula for calculating the moment of resistance to bending, the thin teeth required for fine reeds are particularly flexible. The capillary forces between the teeth can therefore deform or shift such teeth due to their high flexibility (lower restoring force when bent). This results in irregularities in the reed.

[0009] EP3425095B1 shows a weaving reed whose teeth are designed in such a way that, despite the capillary forces that occur when reeds are glued together, a consistent distance between adjacent teeth is ensured. For this purpose, the teeth have spacer studs that provide a minimum distance between adjacent lamellae. This is intended to prevent the formation of irregularities or deformations of the teeth due to capillary forces when the teeth are glued together. However, the spacer studs only counteract the capillary forces once the minimum distance is reached, thus limiting the irregularities. However, different distances can still occur between adjacent teeth of the weaving reed, which can lead to irregularities in the fabric during weaving.

[0010] Against the background of the present state of the art, it is therefore the object of the invention to provide a weaving reed with a fine pitch which counteracts even small displacements of its teeth caused by capillary forces, and a method for its production.

[0011] The problem is solved by a weaving reed having the features of claim 1 and a method having the features of claim 13. A weaving reed for weaving machines with a maximum pitch of one eighth of a millimeter comprises at least two teeth, wherein the teeth extend predominantly in their longitudinal direction and are arranged next to one another in their width direction, which runs perpendicular to the longitudinal direction, forming an inter-tooth space. The inter-tooth space is the free space between adjacent teeth, which is formed by the spacing of the teeth in their width direction. The at least two teeth each have at least two end faces which delimit the respective tooth in its height direction, which runs perpendicular to its length direction and its width direction, and are spaced from one another in this height direction.The weaving reed comprises at least two profile bars that form a functional pair, which bear against the at least two end faces - preferably flat - and lie opposite each other in pairs in the vertical direction. The profile bars extend predominantly in the width direction and have a profile cross-section in a plane spanned by the longitudinal direction and the vertical direction, which is usually semicircular. However, any other profile cross-section is also conceivable - for example a rectangular cross-section. Preferably, the weaving reed comprises four profile bars that form two functional pairs. Furthermore, the weaving reed comprises at least one binding means that at least partially wraps around the at least two opposing profile bars that form a functional pair and pulls them towards one another, wherein the binding means runs at least partially in the interdental space between the at least two teeth.The binding agent is typically wound spirally around the functional pairs of profile bars, with the teeth located within at least one turn of the spirally arranged binding agent. Multiple turns can be arranged between two teeth. The binding agent is a textile yarn comprising a plurality of filaments, wherein the textile yarn has a greater width in the width direction at at least one point where it is in direct contact with at least one of the profile bars than in the regions that lie between the profile bars in the height direction. If the profile bars have a semicircular cross-section, the yarn usually lies on the circumference of the semicircle and has direct contact with the profile bar in this region. In this region, the textile yarn extends in the width direction with a greater width than the space between the teeth through which the textile yarn runs. It therefore widens outside the space between the teeth.This increases the contact area between the textile yarn and the profile bar, preventing the yarn from slipping on the profile bar due to the larger friction surface. As a result, the textile yarn also better secures the position of the teeth in the width direction. In this way, weaving reeds can be manufactured with a fine pitch and precise alignment of their teeth and interdental spaces in the width direction. The textile yarn therefore has a direct influence on the position and the securing of the position of the teeth. Since the widening of the textile yarn occurs while maintaining the yarn volume, the height of the yarn decreases perpendicular to the width direction in the widening area. The yarn cross-section is therefore not circular in these areas.Surprisingly, it has been shown that even reeds with a comparatively small pitch of one-eighth of a millimeter or less can be produced particularly uniformly using the aforementioned method. A greater uniformity of the interdental spaces can be achieved than is possible with conventional reeds that use metallic wire as a binding agent.

[0012] The textile yarn is advantageously elastic. Preferably, the textile yarn wraps around the profile bars in an elastically pre-tensioned manner. Using an elastic textile yarn, the teeth can be secured in position before the reed is glued by applying a pre-tensioning force. This has the advantage that even small movements in the reed can be compensated for by stretching or contracting the textile yarn without completely losing the pre-tensioning force. The pre-tensioning force, which may then change slightly, prevents the previously bonded teeth between the profile bars from loosening or shifting.

[0013] It is particularly advantageous if the textile yarn has adjacent windings that are so wide in the width direction that the adjacent windings abut one another at at least one point where they are in direct contact with at least one of the profile bars. Thus, at least in some sections, there is no gap between adjacent windings of the textile yarn in the width direction. Through the contact of the adjacent windings of the textile yarn, these windings mutually secure their position relative to the profile bars and thus prevent a displacement of the reed teeth functionally connected to these windings in the width direction.

[0014] Further advantages arise when the filaments of the textile yarn have a maximum diameter that corresponds to no more than half the width of the inter-tooth space in the width direction. Advantageously, the filaments have a maximum diameter of no more than one-third, but preferably no more than one-quarter, of the width of the inter-tooth space in the width direction. Such a textile yarn is compressible and can be adapted in its width direction to the inter-tooth space, but at the same time offers sufficiently high resistance to compression if the width of the inter-tooth space falls below its nominal size. The textile yarn thus counteracts deformations and / or displacements of the teeth in the width direction, which can be caused, for example, by capillary forces during bonding, and thus improves the uniformity of the inter-tooth spaces of the reed.The number of filaments in the yarn can also influence the uniformity of the reed. The reed preferably comprises at least five filaments, but preferably at least fifteen.

[0015] Advantageously, the textile yarn is compressible upon application of a compression force, with the compression force increasing progressively with increasing compression of the textile yarn. A textile yarn with these characteristics can prevent the formation of irregular interdental spaces in the reed by counteracting the capillary forces acting on the teeth, particularly during reed bonding, when the width of the interdental spaces falls below the target.

[0016] Further advantages regarding the uniformity of the inter-tooth spaces arise when the textile yarn in the areas of the reed that lie between the profile bars in the vertical direction rests against at least one tooth on both sides in the width direction. In these areas, the textile yarn therefore completely fills, at least in sections, the entire tooth gap between adjacent teeth in the width direction. To this end, the textile yarn is advantageously compressed to the desired dimension of the inter-tooth space during assembly of the reed. The textile yarn therefore advantageously has a larger diameter than the desired dimension of the inter-tooth space, but can be compressed to the desired dimension of the inter-tooth space.

[0017] The textile yarn is advantageously twisted and has a twist coefficient α of at least 20, the twist coefficient α being the following formula: ∝ = t ∗ P t 1000 with t = number of turns per meter of the textile yarn Pt = fineness of the textile yarn in tex. However, the textile yarn advantageously has a twist coefficient of 20 to 100. The twist coefficient is described in DIN EN ISO 2061 and is specified without a unit in this standard. The standard states as follows: "The twist coefficient describes the angle that the fibers on the surface of the yarn form with respect to the yarn axis and is a measure of the yarn's hardness produced by twisting." One twist of the yarn corresponds to This involves a rotation of 360° around the longitudinal axis of the yarn. The rotation of the yarn can influence its cross-sectional shape as well as its stretch and compression behavior. The twist coefficient is often referred to in the literature as the degree of twist or twist coefficient. It characterizes the twist hardness and is suitable for comparing the stretch and compression behavior of yarns of different fineness. The twist coefficient indicates the number of twists per meter of length that a comparison yarn with a fineness of 1000 tex would have with the same twist hardness. Yarns have the same twist hardness if their twist coefficient is the same. It has been shown that when tying fine reeds with a textile yarn, the stretch and compression behavior of a textile yarn with a twist coefficient in the above-mentioned selection range brings advantages in terms of the uniformity of the reed.However, it is particularly advantageous if the textile yarn has a twist coefficient of 45 to 65. The textile yarn is compressible at least to the desired width of the interdental space. However, if the desired width of the interdental space is exceeded, the compression force increases at least progressively with increasing compression. The increasing compression force thus counteracts the undershoot of the desired width of the interdental space.

[0018] Further advantages arise when the textile yarn has 500 to 2000 twists per meter. However, the textile yarn preferably has 800 to 1800 twists per meter. The number of twists per meter of yarn allows the stretch and compression behavior of the textile yarn to be adjusted to ensure the most uniform tooth spacing possible during reed production.

[0019] The textile yarn advantageously comprises at least one filament containing at least one of the following materials: polyamide, polyamide 6.6, polyamide 6, polyester, polyimide, polyamide-imide, polypropylene, polyurethane. Due to its material behavior, polyamide is particularly suitable for forming a textile yarn that exhibits the required stretch and compression behavior. However, the textile yarn can advantageously also consist of other materials not mentioned in the above list that enable the formation of a yarn with the required stretch and compression behavior. The filaments of the textile yarn can advantageously also contain more than one material. The textile yarn can therefore comprise, for example, polyamide filaments and polyester filaments, different polyamide filaments, or different polyester filaments. However, all filaments of the textile yarn advantageously contain polyamide.

[0020] To achieve the most uniform pre-tension force and uniform tooth spacing possible, it is advantageous if the textile yarn has a tensile strength of at least 20 cN / tex. The textile yarn preferably has a tensile strength of no more than 100 cN / tex. However, it is particularly advantageous if the textile yarn has a tensile strength of between 30 cN / tex and 60 cN / tex. The tensile strength can be determined according to DIN EN ISO 2062.

[0021] Further advantages arise when the textile yarn has a maximum tensile elongation of 10% to 80%, but preferably 20% to 45%. The maximum tensile elongation can be determined according to DIN EN ISO 2062.

[0022] An advantageous embodiment of the weaving reed does not comprise a spacer, the arrangement of which determines the width of the interdental space between the at least two teeth. A spacer can be, for example, a metallic (essentially incompressible) wire, a metallic spiral, or a spring. Such spacers are known from the prior art and are used in addition to the binding agent. In prior art weaving reeds, they are arranged between the teeth of a weaving reed. Particularly in the case of weaving reeds with small pitches of less than 0.1 mm, this often involves very complex manual work. For example, the production of a weaving reed with more than 150 teeth per cm, in which spacers are inserted between the teeth, can take several months. This technology is therefore not suitable for the industrial production of weaving reeds with such small pitches.

[0023] Advantageously, at least one tooth of the reed has at least one spacing knob, which is raised at least on one side in the width direction B relative to a large part of the tooth and prevents the minimum distance to at least one adjacent tooth in the width direction B from being exceeded. Such spacing knobs are already known from EP3425095B1. There, for example, the Figures 4 and 5 Teeth (#16) of a weaving reed having spacer studs (#30). All embodiments of the spacer studs disclosed in this patent specification can be advantageously combined with the present inventive teaching. The spacer studs can counteract the capillary forces that occur between adjacent teeth. This allows even the inter-tooth spaces of weaving reeds with small pitches to be produced evenly.

[0024] The following describes a method for producing a weaving reed with a maximum pitch of one-eighth of a millimeter. In a first method step, at least two teeth, which extend predominantly in their longitudinal direction, are arranged next to one another, forming a tooth gap in their width direction, which runs perpendicular to the longitudinal direction. The at least two teeth each have two end faces that delimit the respective tooth in its height direction, which runs perpendicular to its length direction and its width direction, and are spaced apart from one another in this height direction.Subsequently, at least one binding agent is wound around at least two profile bars, which form a functional pair and lie opposite one another in pairs in the vertical direction, in such a way that it at least partially wraps around the at least two profile bars and pulls them towards one another in such a way that the at least two profile bars rest on the at least two end faces of the at least two teeth. The binding agent runs at least partially in the inter-tooth space between the at least two teeth. A textile yarn comprising a plurality of filaments is used as the binding agent, wherein the textile yarn is wound under pretension in such a way that, at at least one point where it is in direct contact with at least one of the profile bars, it widens in the width direction compared to the width of the yarn in the regions which lie between the profile bars in the vertical direction.Winding the yarn under pretension means that the yarn is subjected to a pretensioning force and stretched along its longitudinal direction for winding. The textile yarn expands, or widens, outside the tooth space. This increases the contact area between the textile yarn and the profile bar, thus preventing the yarn from slipping on the profile bar due to the enlarged friction surface. As a result, the textile yarn also better secures the position of the teeth in the width direction. In this way, weaving reeds with a fine pitch and precise alignment of their teeth and tooth spaces in the width direction can be produced. The described process is suitable for producing a weaving reed with all the features already described in the previous sections.

[0025] Advantageously, the textile yarn is wound under pretension such that it widens in the width direction at at least one point where it is in direct contact with at least one of the profile bars, such that adjacent turns of the textile yarn in the width direction are laterally adjacent to one another in the width direction. In this way, adjacent turns of the textile yarn secure each other against slipping in the width direction and also prevent the teeth of the reed from slipping during production.

[0026] In an additional process step, the textile yarn is compressed between the at least two teeth in the width direction to the width of the interdental space. However, the filaments of the textile yarn are not compressed. The compression of the yarn advantageously results in the positions of the filaments of the textile yarn being changed—i.e., shifted—and the cross-sectional shape of the yarn, but not the cross-sectional shape of individual filaments, being changed. The filaments are therefore advantageously rearranged relative to one another.

[0027] Further advantages arise when the filaments of the textile yarn are compressed when the width of the interdental space falls below the target. In this way, the compression force increases disproportionately when the width falls below the target, and the textile yarn, or rather its filaments, counteract the undershoot of the interdental space. This ensures the most uniform width of the interdental spaces possible during reed production. Fig. 1 Figure 1 shows a three-dimensional view of a reed with a plurality of teeth (2) arranged next to one another in the width direction (B), forming interdental spaces (5). Fig. 2 Figure 2 shows a section through the reed from Fig. 1 , which lies in a plane spanned by the longitudinal direction (L) and the height direction (H) and runs exactly between two teeth (2) through a tooth gap (5). Fig. 3 Figure 3shows the section AA from Fig. 2 . Fig. 4 Figure 4 shows the cut BB from Fig. 2 . Fig. 5 Figure 5 shows detail C from Fig. 2 , wherein the textile yarn (4) has a twist. Fig. 6 Figure 6 shows how Fig. 3 the section AA Fig. 2 . Compared to Fig. 3 However, the textile yarn (4) comprises more filaments (8). Fig. 7 Figure 7 shows how Fig. 4 the cut BB from Fig. 2 . As opposed to Fig. 4 However, adjacent turns of the textile yarn (4) do not lie sideways against each other in the width direction (B).

[0028] The Figure 1shows a three-dimensional view of a weaving reed 1. The weaving reed 1 comprises a plurality of teeth 2 which are arranged next to one another in a width direction B, forming inter-tooth spaces 5 between adjacent teeth 2. Four profile bars 3 are positioned above and below the teeth 2 in the height direction H. Two profile bars 3 which are opposite one another in a mirror image in the height direction H form a functional pair and enclose the teeth 2 between them in the height direction H. A textile yarn 4 is wrapped spirally around a functional pair of the profile bars 3, so that a turn of the textile yarn 4 runs through each inter-tooth space 5, and connects the profile bars 3 and the teeth 2 in this way.

[0029] The Figure 2 shows a section through the reed 1 from Fig. 1. The section runs in a plane spanned by the longitudinal direction L and the vertical direction H and lies exactly between two teeth 2 in a tooth gap 5. The tooth gap 5 is therefore not provided with a reference symbol in this illustration. Only one tooth 2 is shown because it obscures the other teeth 2 of the reed in this view. At the left and right ends of the teeth 2 in the illustration there are two profile bars 3 which form a functional pair. The profile bars 3 lie on the end faces 6 of the teeth 2 and are pressed onto the end faces 6 by the textile yarn 4 which is wrapped around the profile bars 3 with pretension. This exerts a clamping force on the teeth 2 which is suitable for securing the position of the teeth 2 and preventing displacement in the width direction B. In the illustration one turn of the textile yarn 4 is wound around each functional pair of profile bars 3.The turns each begin at the highest point of the textile yarn 4 in the vertical direction H, which can be seen from the fact that the textile yarn 4 is cut at this point. The cut surfaces 7 of the textile yarn 4 are shown hatched. The turns each run completely around a functional pair of profile bars 3 and then transition into the next turn of the textile yarn 4, which runs in the interdental space 5 located behind the illustrated tooth 2.

[0030] The Figure 3 shows the section AA from Fig. 2. It can be seen how the textile yarn 4 is arranged in the interdental spaces 5. In this embodiment, the textile yarn 4 consists of eleven filaments 8 and is wound around the profile bars 3 in such a way that one turn of the textile yarn 4 runs in each interdental space 5. The textile yarn 4 is therefore shown cut once in each interdental space 5 in this illustration. The textile yarn 4 is a twisted yarn and, in its original state before being wound around the profile bars 3, has a substantially circular cross-section. However, during assembly of the reed 1, this cross-section is compressed. In the Fig. 3For example, it can be seen that the cross-section of the textile yarn 4 between the teeth 2 of the reed 1 is compressed in such a way that it is adapted to the width 9 of the inter-tooth spaces 5 in the width direction B. The textile yarn 4 thus rests on a tooth 2 on both sides in the width direction B. The position of the filaments 8 relative to one another can thereby shift. However, individual filaments 8 are preferably not compressed. This allows the textile yarn 4 to be compressed to the target dimension of the width 9 of the inter-tooth spaces 5 with a defined application of force. If the target dimension is undershot, however, the individual filaments 8 are advantageously compressed, which requires a significantly greater compression force. In this way, undershooting the target dimension of the width 9 of the inter-tooth space 5 can be counteracted.This behavior of the textile yarn 4 can be achieved by the filaments 8 having a maximum diameter 13 which corresponds to a maximum of half the width 9 of the tooth spaces 5. In the . Fig. 2 It also shows once again what is meant by pitch 11 in the context of this patent application. Pitch 11 is the sum of the width 9 of the inter-tooth space 5 and the tooth width 10 in the width direction B.

[0031] The Figure 4 shows the section BB through the reed 1 from Fig. 2. A large number of teeth 2 are shown in section. In the longitudinal direction L behind the cutting plane, a profile bar 3 is shown above the teeth 2. In the width direction B between adjacent teeth 2 there is a tooth space 5. The two tooth spaces 5 on the left in the illustration are completely filled with the textile yarn 4 in the width direction B and height direction H. The textile yarn 4 can therefore ensure that the tooth spaces 5 are evenly formed. For clarity, three tooth spaces 5 without textile yarn 4 are shown in the illustration. These tooth spaces 5 are actually also filled with the textile yarn 4. The textile yarn 4 is rotated by the angle of rotation 12 around its longitudinal axis and emerges from the tooth spaces 5 at the top in the height direction H. When it emerges from the tooth spaces 5, the textile yarn lies against the profile bar 3 and expands in the width direction B.It therefore has a greater width in the areas in which it rests on the profile bar 3 than in the areas in which it runs between the teeth 2 in the inter-tooth spaces 5. The textile yarn 4 expands further and further in the height direction H with increasing distance from the inter-tooth spaces 5 until adjacent turns of the textile yarn 4 rest against one another in the width direction B. In this way, the adjacent turns of the textile yarn 4 mutually secure their position and the position of the teeth 2 in the width direction B. While the textile yarn 4 expands in the width direction B, its height 14 decreases perpendicular to the width direction B and perpendicular to the longitudinal extent of the textile yarn 4. This behavior of the textile yarn 4 is shown in . Fig. 5 which shows detail C from Fig. 2shows. The extent to which the textile yarn 4 expands in the width direction B or contracts in its height 14 can be influenced by the twist of the textile yarn 4. In a slightly twisted yarn (small twist angle 12) or a yarn without twist, this effect is more pronounced than in a highly twisted yarn (large twist angle 12).

[0032] The Figure 6 shows essentially the same view as the Fig. 3 However, the textile yarn 4 comprises more filaments (exactly 22 filaments). The filaments have a smaller maximum diameter 13, which is less than one-third of the width 9 of the interdental space 5. Such a textile yarn 4 adapts even better to the interdental space 5. Therefore, it can be used to produce reeds 1 with even greater uniformity of the interdental spaces 5.

[0033] The Figure 7 shows essentially the same view as the Fig. 4However, the textile yarn 4 has a different stretching and compression behavior. In this embodiment, the textile yarn 4 also expands outside the interdental spaces 5 in the width direction B. In contrast to the Fig. 4 However, in the embodiment shown, the textile yarn 4 does not open up so far that the adjacent turns of the textile yarn 4 lie laterally against one another in the width direction B.

[0034] The Figures 1 to 7 do not in part represent the actual size ratios of the individual components of the reed 1. These are therefore not scaled drawings but schematic sketches intended to show the essential features of the invention. List of reference symbols 1 Web sheet 2 Tooth 3 profile bar 4 textile yarn 5 Interdental space 6 frontal surface 7 Cutting surfaces of the textile yarn 4 8 Filaments 9 Width of the interdental space 5 10 Tooth width 11 division 12 angle of rotation 13 Maximum diameter of filaments 8 14 Height of textile yarn 4 B Latitude direction H Altitude direction L Longitudinal direction α Rotation coefficient

Claims

1. Reed (1) for weaving looms having a maximum pitch (11) of 1 / 8 mm having the following features a) at least two dents (2), wherein the dents (2) extend predominantly in their longitudinal direction (L) and are arranged next to one another in their width direction (B), which runs perpendicular to the longitudinal direction (L) to form a dent intermediate space (5), b) wherein the at least two dents (2) each have two end faces (6) which delimit the respective dent (2) in its height direction (H) which runs perpendicular to its longitudinal direction (L) and its width direction (B) and which are spaced apart from one another in this height direction (H), c) at least two profile rods (3), which form a functional pair which abut against the at least two end faces (6) and are located opposite one another in pairs in the height direction (H), d) at least one binding means which at least partially wraps around and draws together the at least two opposite profile rods (3) forming a functional pair, e) wherein the binding means runs at least in sections in the dent intermediate space (5) between the at least two dents (2), f) and the binding means is a textile yarn (4) comprising a plurality of filaments (8), g) wherein at at least one point at which it comes in direct contact with at least one of the profile rods (3) the textile yarn (4) has a greater width in the width direction (B) than in the regions which lie between the profile rods (3) in the height direction (H).

2. Reed (1) according to the preceding claims characterized in that the textile yarn (4) is elastic.

3. Reed (1) according to one of the preceding claims characterized in that the textile yarn (4) has adjacent windings which have such a large width in the width direction (B) that at at least one point at which they are in direct contact with at least one of the profile rods (3) the adjacent windings abut against one another.

4. Reed (1) according to one of the preceding claims characterized in that the filaments (8) have a maximum diameter (13) which corresponds to at most half the width (9) of the dent intermediate space (5).

5. Reed (1) according to one of the preceding claims characterized in that the textile yarn (4) is compressible under application of a compressive force, wherein the compressive force increases progressively with increasing compression of the textile yarn (4).

6. Reed (1) according to one of the preceding claims characterized in that in the regions which lie between the profile rods (3) in the height direction (H) the textile yarn (4) abuts against at least one dent (2) in each case on both sides in the width direction (B).

7. Reed (1) according to one of the preceding claims characterized in that the textile yarn (4) is twisted, and that the textile yarn (4) has a twist factor α of at least 20 wherein the following formula applies for the twist factor: ∝ = t ∗ P t 1000 Where t = is the number of twists per metre of the textile yarn (4) Pt = is the yarn count of the textile yarn (4) in tex.

8. Reed (1) according to one of the preceding claims characterized in that the textile yarn (4) has at least one filament which preferably contains at least one of the following materials: polyamide, polyamide 6.6, polyamide 6, polyester, polyimide, polyamidimide, polypropylene, polyurethane.

9. Reed (1) according to one of the preceding claims characterized in that the textile yarn (4) has a yarn count related maximum tensile force of at least 20 cN / tex.

10. Reed (1) according to one of the preceding claims characterized in that the textile yarn (4) has a maximum tensile force elongation of 10 to 80 %, but preferably of 20 % to 45%.

11. Reed (1) according to one of the preceding claims characterized in that the reed (1) does not comprise any spacer whose arrangement predefines the width of the dent intermediate space (5) between the at least two dents (2).

12. Reed (1) according to one of the preceding claims 1 to 10 characterized in that at least one dent (2) has at least one spacer stud which is elevated in the width direction (B) with respect to a large part of the dent (2) at least on one side and prevents a minimum spacing with respect to at least one adjacent tooth (2) in the width direction (B) from being fallen below.

13. Method for manufacturing a reed (1) having a maximum pitch (11) of 1 / 8 mm comprising the following steps: a) at least two dents (2) which extend predominantly in their longitudinal direction (L) are arranged next to one another to form a dent intermediate space (5) in their width direction (B) which runs perpendicular to the longitudinal direction (L), b) wherein the at least two dents (2) each have two end faces (6) which delimit the respective dent (2) in its height direction (H) which runs perpendicular to its longitudinal direction (L) and its width direction (B) and which are spaced apart from one another in this height direction (H), c) at least one binding means is wound in such a manner around at least two profile rods (3) which form a functional pair and lie opposite one another in pairs in the height direction (H) that it wraps at least partially around the at least two profile rods (3) and draws them together in such a manner that the at least two profile rods (3) rest on the at least two end faces (6) of the at least two dents (2), d) wherein the binding means runs at least in sections in the dent intermediate space (5) between the at least two dents (2), e) and a textile yarn (4) comprising a plurality of filaments (8) is used as binding means, f) wherein the textile yarn (4) is wound in such a manner under pre-tension that at least at a point at which it is in direct contact with at least one of the profile rods (3) it broadens in the width direction (B).

14. Method for manufacturing a reed (1) according to the preceding claim characterized in that the textile yarn (4) is wound in such a manner under pre-tension that at least at a point at which it is in direct contact with at least one of the profile rods (3), it is broadened in the width direction (B) in such a manner that windings of the textile yarn (4) lying next to one another in the width direction (B) abut against one another laterally in the width direction (B).

15. Method for manufacturing a reed (1) according to one of the preceding claims 13 or 14 characterized in, a) that the textile yarn (4) is compressed to the width (9) of the dent intermediate space (5) between the at least two dents (2) in the width direction (B), b) and that the filaments (8) of the textile yarn (4) are not thereby compressed.

16. Method for manufacturing a reed (1) according to one of the preceding claims 13 or 14 characterized in that the filaments (8) of the textile yarn (4) are compressed when the nominal dimension of the width (9) of the dent intermediate space (5) is fallen below.

Images