Heddle for loom and loom equipped with such a heddle

Abstract

Heddle for a loom and loom equipped with such a heddle. This heddle comprises a link (2) and at least one rod (4) made of polymer material, one longitudinal end (44) of which includes surfaces covering the transverse faces (28, 29) of the link. The rod (4) and the link (2) form at least one cavity (C44), offset from the link parallel to a longitudinal axis (X1) and delimited by a first peripheral surface (S1) of the link, a second lateral surface (S2), formed by the outer surface (S4) of the rod (4), and a third bottom surface (S3), formed by the rod (4) and extending from one of the covering surfaces. An intersection line (L44) extends from the third bottom surface and delimits the first surface. The third bottom surface is disposed outward from the rod (4) relative to the second lateral surface.Each cavity is unobstructed, along a thickness axis (Z1) in a direction away from the third bottom surface. Figure for the abbreviation: Fig 7.

Description

Title of the invention: Heddle for loom and loom equipped with such a heddle

[0001] The invention relates to a warp thread guide rail for a loom equipped with a Jacquard mechanism, as well as to a loom comprising a Jacquard mechanism and such a rail.

[0002] The technical field of the invention is that of the formation of the heddle on a loom, by means of heddles, each comprising an eyelet for the passage of one or more warp threads and each allowing one or more warp threads to be moved vertically, to form a heddle for the passage of weft threads. Such heddles are placed side by side on the loom, within a harness, with a high density, which induces friction between a heddle and the warp threads passing through the eyelets of the adjacent heddles.

[0003] It is known from EP-A-1 908 863 to overmold two rods with a rounded cross-section onto a link of a heddle by inserting one longitudinal end of each rod into a corresponding recess in the link. These recesses are relatively large, which tends to weaken the link in the area where it connects to the rods. Furthermore, burrs form during the overmolding operation due to variations in the dimensions of the link and variations in its positioning within the mold used during this operation. These burrs appear, in particular, at the intersection of a peripheral surface of the link with each rod. These burrs risk damaging, or even severing, a warp thread near the heddle once it is mounted in a jacquard loom harness, as this warp thread may snag on the burrs.These burrs must therefore be reduced, or even eliminated, after the overmolding operation, which requires a rework operation that is delicate to implement and time-consuming.

[0004] It is these problems that the invention intends to remedy more particularly by proposing a new heddle for Jacquard loom, with which the risks of snagging of neighboring warp threads during weaving are greatly reduced, or even eliminated.

[0005] To this end, the invention relates to a warp thread guide rail for a loom equipped with a Jacquard mechanism, the rail extending lengthwise along a longitudinal axis and comprising: - a link, with an eyelet for the chain wire, the eyelet passing through the link between a first transverse face and a second transverse face of the link, the first and second transverse faces being connected to each other by a peripheral surface of the link; at least one rod made of polymer material extending along the longitudinal axis, which has an external surface and which includes a first longitudinal end provided with means for connection to a component of a Jacquard mechanism harness and a second monobloc longitudinal end which comprises at least a first cover surface which partially covers the first transverse face of the link, a second cover surface which partially covers the second transverse face of the link, and an anchor heel;

[0006] in which the first cover surface and the second cover surface are parallel to the longitudinal axis and to a transverse axis, itself perpendicular to the longitudinal axis;

[0007] in which the link cooperates with the anchor heel of the stem to oppose a separation of the stem and the link parallel to the longitudinal axis.

[0008] According to the invention, the rod and the link form, at the second longitudinal end of the rod, at least one cavity which is offset from the link in a direction parallel to the longitudinal axis and which is delimited by a first surface formed by a portion of the peripheral surface of the link; a second lateral surface formed by a portion of the external surface of the stem, this second lateral surface extending in the direction of the first longitudinal end of the stem, from a line of intersection between the peripheral surface of the link and the external surface of the stem; a third bottom surface formed by the stem and extending one of the first and second covering surfaces towards the first longitudinal end of the stem,.

[0009] Within each cavity, the line of intersection extends from the third bottom surface and delimits the first surface. Furthermore, for each cavity, the third bottom surface is oriented, in a direction parallel to the transverse axis, outward from the stem relative to the second lateral surface. Finally, each cavity is not directly opposite, along a thickness axis perpendicular to the longitudinal and transverse axes, in a direction away from a portion of the second stem that forms the third bottom surface of the cavity.

[0010] Thanks to the invention, the cavity formed near the second longitudinal end of the rod makes it possible to position certain areas of the smooth surface where burrs are The most likely to form during the overmolding of the heddle onto the link is recessed inside the cavity. Thus, adjacent warp threads, which are taut and in contact with the outer surface of the heddle when the heddle is integrated into a Jacquard-type loom harness, cannot come into contact with inward-pointing edges formed within the cavity. This applies particularly to areas formed by the line of intersection between the peripheral surface of the link and the outer surface of the heddle, or by an inward-pointing junction between the first and third bottom surfaces. This prevents any contact between adjacent warp threads and burrs that tend to form in these areas. The risk of burrs catching, damaging, or severing adjacent warp threads during heddle operation is therefore significantly reduced, or even eliminated.Since no surface limits the cavity in the direction perpendicular to the first covering surface, in a direction away from the third bottom surface, the second longitudinal end of the rod can be overmolded in a drawerless mold, which further limits the formation of burrs.

[0011] According to advantageous but not mandatory aspects of the invention, such a rail may incorporate one or more of the following features taken in any technically permissible combination:

[0012] - The third bottom surface of each cavity is coplanar or substantially co The link is planar with the overlapping surface it extends. The link includes at least one through-hole between the first and second transverse faces of the link. The anchoring lug passes completely through the link's through-hole along its thickness axis. A contour surface of the through-hole includes a proximal portion, arranged longitudinally on the eyelet side. The proximal portion of the through-hole is located, along the longitudinal axis, between the cavity(es) formed in the shank and the eyelet. The anchoring lug forms the free edge of the second longitudinal end. The first and second overlapping surfaces of the shank extend to the anchoring lug.

[0013] - The anchoring heel of the second longitudinal end of the rod is delimited by two surfaces respectively parallel to the first and second transverse faces of the link. The anchor heel bears longitudinally against the proximal portion of the contour surface of the housing.

[0014] - The line of intersection extends to an edge that borders the second surface of recovery.

[0015] - The rail comprises two rods made of polymer material, each with a first a longitudinal end and a second longitudinal end. The second longitudinal ends of the two rods each partially cover the first and second transverse faces of the link. Two cavities are formed at the level of the second longitudinal end of each stem on either side of a plane containing the longitudinal and transverse axes and passing through a geometric center of the eyelet.

[0016] - The two cavities formed at the same second longitudinal end of the same stem, are without opposite each other along the same direction parallel to the thickness axis. The link is flat and symmetrical with respect to a geometric center of the eyelet.

[0017] - The first surface is formed by a portion of the peripheral surface of the link in a transition zone of the link where the width of the link, taken along the transverse axis, decreases as you move away from the eyelet along the longitudinal axis.

[0018] - The third bottom surface is delimited along the transverse axis outwards from the stem by a junction edge which connects the third bottom surface to the external surface of the stem, which is curved and whose concavity is turned towards the second bottom surface.

[0019] - The joining edge extends to a distance from the line of intersection, the value of which minimum is greater than or equal to half the thickness of the link, measured between the first and second overlap surfaces along the thickness axis.

[0020] - A radius of curvature of the projection of the joining edge into a parallel plane the radius of curvature of the projection of the first surface into this plane, preferably at least 1.5 times greater.

[0021] - At the longitudinal level of the cavity and on the side of each covering surface along the thickness axis, the second longitudinal end of the stem has a thickness, measured along the thickness axis with respect to the plane formed by the overlap surface, which is greater than or equal to a thickness of the link measured between the first and second overlap surfaces.

[0022] - On the side of each overlapping surface along the thickness axis, the second The longitudinal end of the stem has, longitudinally between the third bottom surface and a free edge of the second longitudinal end, a width, measured parallel to the transverse axis, decreasing towards the free edge and a thickness, measured along the thickness axis, decreasing towards the free edge.

[0023] - The link comprises at least one longitudinal end leg which is com completely surrounded by the second longitudinal end of the stem.

[0024] According to a second aspect, the invention relates to a loom equipped with a Jacquard mechanism and several warp thread guide rails, at least one of which is as mentioned above.

[0025] The operation of this Jacquard loom is more reliable, with less risk of snagging the warp threads, than those of the prior art.

[0026] The invention will be better understood and other advantages thereof will become more apparent clearly in light of the following description of three methods of implementing a heddle conforming to its principle and a Jacquard loom also conforming to its principle, given solely as an example and with reference to the attached drawings in which:

[0027] [Fig-1] The [Fig. 1] is an elevational view of a warp thread guide rail for a Jacquard type loom, according to a first embodiment of the invention;

[0028] [Fig.2] The [Fig.2] is a larger scale view of detail II in the [Fig.1];

[0029] [Fig. 3] [Fig. 3] shows, on an insert A), a larger-scale view of the detail III to [Fig.1], on an insert B), a side view in the direction of arrow B on insert A) and, on insert C), a section along line CC of insert A);

[0030] [Fig. 4] [Fig. 4] shows, on two inserts A) and B), a front view and a section longitudinal along plane BB of a link belonging to the smooth of figures 1 to 3;

[0031] [Fig. 5] [Fig. 5] shows, on two insets A) and B), a side view of an area of junction between a rod and the link of the smooth of figures 1 to 3, as well as a partial longitudinal section along the VV plane in [Fig.2];

[0032] [Fig.6] Fig.6 represents the same junction zone in elevation in the direction of the arrow VI in [Fig.5], as well as several sections taken respectively at the level of the cutting lines AA, BB, CC and DD;

[0033] [Fig.7] Fig.7 represents, on two insets A) and B), two perspective views of the junction area, seen from two different angles;

[0034] [Fig.8] Fig.8 is a view analogous to inset A) of Fig.7 for a smooth conforming to a second embodiment;

[0035] [Fig.9] Fig.9 shows, on three insets A), B) and C), a side view, a longitudinal section and a front view, in the direction of arrow C on insert A), of the junction area of ​​the smooth of the second embodiment;

[0036] [Fig. 10] [Fig. 10] is a front view similar to [Fig. 6] for a rail conforming to a third embodiment, as well as several sections taken respectively at the cutting lines AA, BB, CC and DD; and

[0037] [Fig. 11] The [Fig. 11] is a schematic representation of a Jacquard type loom according to the invention, incorporating at least one of the heddles shown in figures 1 to 10, as well as a harness according to the invention.

[0038] The Jacquard-type loom M shown in [Fig. 11] is equipped with a Jacquard mechanism 102 which controls several hooks 104. A lower end of each hook 104 is associated with an arch 106. A lower end 106a of each arch 106 is connected to an upper end 1a of a heddle equipped with a guide link 2 1 for a warp thread 108. Each heddle 1 is connected by its lower end 1b to a spring 110 fixed to a hanging beam 112, the beam 112 being attached to a frame not shown of the loom M. The different arches 106 are distributed, in depth and on the width of the loom, by passing through holes made in a postboard 114. The elements 1, 106, 110 and 114 form a harness H belonging to the loom M and controlled by the Jacquard mechanism 102.

[0039] The rails shown in figures 1 to 10 are intended to be integrated into the harness H.

[0040] Figures 1 to 7 show a first embodiment of a guide rail 1 of a warp thread of the harness H on the loom M.

[0041] The guide rail 1 extends along a longitudinal axis XI and comprises a rail body 10 and a link 2. The rail body 10 has two rods 4 which are separate and arranged on either side of the link 2, along the longitudinal axis XL

[0042] The rods 4 are made of polymer, for example Nylatron (registered trademark) or natural polyamide PA6, preferably unfilled. They are overmolded onto the link 2, i.e., obtained by an overmolding operation around the link 2.

[0043] Overmolding means that the link 2 is at least partially placed in an injection mold formed of at least two mold portions which together define an impression around the link 2. This impression is filled by injecting the polymer material intended to form a stem 4. In practice, the two stems 4 of the rail 1 are advantageously overmolded simultaneously onto the link 2 in a mold forming two impressions. Each of the stems formed at the end of the overmolding operation is preferably a single piece. As explained below, each stem 4 is anchored in the link 2 by a portion of the stem, called the heel, which is engaged in a recess defined by the link.

[0044] Let Y1 and ZI be two axes of the rail 1 which are perpendicular to the longitudinal axis XL. The axis Y1 extends along the width of the link 2, while the axis ZI extends along the thickness of the link 2. The axis Y1 constitutes a transverse axis for the rail 1, while the axis ZI constitutes a thickness axis for the rail 1. The center of the coordinate system formed by the axes XI, Y1 and ZI is located at the geometric center C22 of an eyelet 22 of the link 2.

[0045] At each end, the smooth body 10 has attachment means 1IA or 1IB, respectively intended to cooperate with an arch 106 or a spring 110. More specifically, one of the rods 4, shown in the upper part of [Fig. 1], carries the attachment means 1IA on one end 42, while the other rod 4, shown in the lower part of [Fig. 1], carries the attachment means 11B on one end 42. The attachment means 11A include an end piece 12 which forms an opening 14 for the passage and wedging of an arch 106 by a tube, not shown, mounted around the upper rod 4. The attachment means 1IB include an external thread 18 which is intended to be screwed into the spring 10 and a slip damper 19.

[0046] The attachment means 1 IA and 1 IB are respectively provided at the upper end IA and lower end 1B of the rail 1 and are preferably manufactured by overmolding on the link 2, at the same time as the rest of the rods 4.

[0047] The examples of attachment means 1 IA and 1 IB are not limiting. For example, the attachment means 1 IA may conform to the teaching of CN-U-210596433.

[0048] The rods 4 are identical to each other, except at the level of the attachment means 1 IA and 11B.

[0049] Opposite its first longitudinal end 42, each rod 4 comprises a second longitudinal end 44 by which it is connected to the link 2, by overmolding. The free edge of the second longitudinal end 44 of a rod 4, which is opposite its first longitudinal end, is denoted 44A.

[0050] Each rod 4 comprises two portions 43 and 45, which are integral with each other, defining the longitudinal ends 42 and 44 respectively, and having a circular and a non-circular cross-section respectively. Thus, portion 43 has a circular cross-section, while portion 45 has a non-circular cross-section. Along the longitudinal axis XI, portion 43 is positioned between portion 45 and the attachment means 1IA or 1IB, and portion 45 is positioned between portion 43 and the link 2.

[0051] As can be seen in [Fig. 3], the circular section of portion 43 is centered on an axis X43 parallel to the longitudinal axis XI and offset from the longitudinal axis XI by a non-zero distance d43 measured parallel to the thickness axis ZI. Y43 is a transverse axis parallel to the transverse axis Y1 and offset from it by the distance d43, in the same direction as the axis X43 with respect to the axis XL. The plane containing the axes X43 and Y43 is a plane of symmetry of portion 43 of the rod 4.

[0052] The cross-section, perpendicular to the longitudinal axis XI, of portion 45 is constant, except at the second longitudinal end 44 and its junction with portion 43. In other words, the second longitudinal end 44 of the rod 4 is a part of portion 45 whose cross-section varies along the longitudinal axis XL

[0053] Link 2 is formed from a single-thickness sheet of metal, preferably stainless steel. It is advantageously obtained by cutting a sheet of metal.

[0054] The link extends along a longitudinal axis X2. Y2 is a transverse axis along which the width of the link 2 extends, and Z2 is a thickness axis along which the thickness of this link extends. In the overmolded configuration of the rods 4 on the link 2, the axes X2, Y2, and Z2 coincide with the axes XI, Y1, and ZI, respectively.

[0055] The link 2 includes a central portion 20 with polished, rounded lateral edges 21, which defines the eyelet 22 for the passage of a chain wire 108, with rounded edges. This eyelet 22 passes completely through the link 2 along the thickness axis Z2. The axes X2, Y2, and Z2 intersect at the geometric center C22 of the eyelet 22, located at mid-thickness of the link. The eyelet 22 is rectangular in the principal plane of the link 2, which is the median plane of the central portion 20 and contains the axes X2 and Y2. The geometric center C22 is a point of symmetry of the link 2, which facilitates its placement in the mold for the overmolding operation of the rods 4, without any prerequisites regarding its orientation.

[0056] The link 2 also includes two longitudinal legs 24 which extend from its central portion 20, along the longitudinal axis X2, at its two opposite longitudinal ends. The legs 24 are end longitudinal legs and each has a reduced width compared to the width of the central portion 20. Between the central portion 20 and the legs 24, the width of the link measured along the transverse axis Y2 gradually decreases as it approaches the legs 24, and the lateral edges 21 of the central portion 20 extend into curved edges 25, which delimit between them a transition zone 26 between the central portion 20 and a longitudinal leg 24.

[0057] In the example in the figures, the transition zone 26 is a zone where the width of the link 2 decreases as one moves away from the eyelet 22 along the longitudinal axis XL

[0058] Note 27 the lateral edges of the longitudinal legs 24.

[0059] A first transverse face 28 and a second transverse face 29 of the link 2 are respectively denoted by 28 and 29, these transverse faces being parallel to the axes X2 and Y2. The first transverse face 28 is visible in Figures 1, 2, 4, 5 and in inset B) of [Fig. 7], while the second transverse face 29 is visible in Figures 4, 5, 6 and in inset A) of [Fig. 7]. The transverse faces 28 and 29 are opposite each other and offset, along the thickness axis Z2, by the thickness e2 of the link 2, which is constant. The transverse faces 28 and 29 extend over the entire surface of the link 2, from the eyelet 22 to the longitudinal tabs 24.

[0060] In each of the transition zones 26, an elongated housing 32 is provided, which constitutes an opening and passes through the link 2 from one side to the other, between its transverse faces 28 and 29, that is to say parallel to the thickness axis Z2. The largest dimension of an elongated housing 32 extends along the longitudinal axis X2.

[0061] A peripheral surface of the link 2 is noted as 31, that is to say the external edge of this link outside the eyelet 22 and outside the housings 32. The peripheral surface 31 includes the longitudinal edges 21, the curved edges 25 and the lateral edges 27.

[0062] Each elongated housing 32 comprises a first proximal lobe 322, on the side of the eyelet 22, and a second distal lobe 324, on the side of a longitudinal leg 24. The lobes 322 and 324 communicate with each other along the longitudinal axis X2. Each housing 32 is thus generally keyhole shaped.

[0063] The elongated housing units 32 are symmetrical to each other with respect to a plane containing the axes Y2 and Z2, which passes through the geometric center C22. Furthermore, each elongated housing unit 32 is symmetrical with respect to a plane containing the axes X2 and Z2, which passes through the geometric center C22.

[0064] Each housing 32 is delimited by a closed contour which includes, along the longitudinal axis X2, a proximal portion 323, which defines the bottom of the proximal lobe 322 on the side of the eyelet 22, and a distal portion 325, which defines the bottom of the distal lobe 324 on the side of the nearest longitudinal leg 24.

[0065] The second longitudinal end 44 of each overmolded rod 4 partially overlaps the two transverse faces 28 and 29 of the link 2 at the transition zones 26 and passes through the link at the recesses 32, completely between the transverse faces 28 and 29. As it passes through the recess 32, the second longitudinal end 44 of each rod 4 forms an anchoring lug 442 which cooperates with the contour of this recess, such that this cooperation opposes relative displacement between the rod 4 and the link in both the longitudinal and transverse directions, i.e., parallel to the axes XI and Y1. In particular, the cooperation of the lug 442 with the contour of the recess 32 opposes separation of the rod 4 and the link 2 parallel to the longitudinal axis XL

[0066] The trace of the anchoring lug 442 in the cutting plane of the insert B) of [Fig. 5] is shown in grey. Each anchoring lug 442 is formed during overmolding onto the link 2 of the rod 4 to which it belongs.

[0067] Each anchoring lug 442 passes through the housing 32 in which it is formed from one end to the other, between the first and second transverse faces 28 and 29. The anchoring lug 442 passes through the housing 32 without discontinuity.

[0068] Each anchoring lug 442 completely fills the elongated housing 32 in which it is formed. In particular, the lug 442 bears against the proximal and distal portions 323 and 325 of the closed contour of this housing, which prevents any relative displacement of the second longitudinal end 44 with respect to the link 2 in directions parallel to the longitudinal axis XL. This anchoring of the lug 442 in the housing 32 also prevents any displacement between the rod 4 and the link 2 in a transverse direction, parallel to the transverse axis YL

[0069] In this embodiment, the part of the anchor heel 442 bearing against the proximal portion 323 of the closed contour of the housing 32 forms the free edge 44A of the second end 44 of the stem 4.

[0070] The second end 44 of a rod 4 has a first covering surface S448 which partially covers the first transverse face 28 of the link 2, on one side of a transition zone 26, and a second cover surface S449 which partially covers the second transverse face 29 of link 2, on a second side of the same transition zone 26, opposite to the first side along the Zl axis. The trace of the cover surface S448 is greyed out in [Fig.6]. Each of the cover surfaces S448, S449 is delimited by the anchor heel 442. In other words, the cover surfaces S448, S449 extend up to the anchor heel 442. The cover surfaces S448 and S449 are coplanar with respectively the first transverse face 28, the second transverse face 29 and therefore extend parallel to the plane formed by the axes XI, Y1 and perpendicular to the thickness axis ZL. A portion of the link 2 is therefore covered by, and embedded between, the two cover surfaces S448 and S449 of the second longitudinal end 44 of each rod 4.This prevents any relative movement between the rod 4 and the link 2 in the two directions perpendicular to the transverse faces 28 and 29, i.e. in the two directions parallel to the thickness axis ZL.

[0071] Thus, each second longitudinal end 44 of a rod 4 is fixed to the link 2, without the possibility of movement in all directions.

[0072] The second longitudinal end 44 is a single piece. It defines the overlap surfaces S448, S449 and includes the anchoring heel 442. Thus the overlap surfaces S448, S449 and the anchoring heel 442 are obtained by filling the same cavity in the same overmolding operation.

[0073] The portion of the anchor heel 442 closest to the proximal portion 323 of the housing 32 is delimited along the thickness axis Zl by two surfaces S442 and S'442, respectively on the side of the first transverse face 28 and on the side of the second transverse face 29. The surfaces S442 and S'442 are planar and parallel respectively to the adjacent transverse faces 28 and 29.

[0074] Advantageously, the surface S442 is flush with the first adjacent transverse face 28, while the surface S'442 is flush with the second adjacent transverse face 29. Thus it is possible to limit the snagging of the neighboring chain wires 108 when they move in contact with the link 2.

[0075] On the side of each transverse face 28 or 29 of the link 2, the second longitudinal end 44 of a rod 4 has an external curved shape, with a thickness e4, measured along the thickness axis Zl, which decreases as it approaches the heel 442, until it takes a value equal to the thickness e2 of the link 2, at the level of the portion of the heel 442 defined between the surfaces S442 and S'442.

[0076] Let 144 be the width of the second longitudinal end 44 measured parallel to the transverse axis Y1 on the side of the transverse face 28. Let 1'44 be the width of the second longitudinal end 44 measured parallel to the axis transverse Y1 on the side of the transverse face 29. On each side of the link 2, the width 144 or 1'44 decreases as it approaches the free edge of the heel 442, until it takes a value equal to the width of the free edge of the heel 442 or of the proximal portion 323 of the elongated housing 32. Overall, on each side of the link 2, and as can be seen in [Fig.7], the second longitudinal end 44 of a rod 4 has a shape comparable to a dolphin's head whose beak is formed by the portion of the heel 422 delimited by the surface S442 or S'442.

[0077] As can be seen from sections BB and CC of [Fig. 6], the longitudinal legs 24 are completely embedded in the second longitudinal ends 44 of the rods 4. In other words, the lateral edges 27, the portions of the transverse faces 28, 29, and the free edge at each leg 24 are in contact with the associated second longitudinal end 44. In other words, each second longitudinal end 44 completely surrounds a longitudinal leg 24.

[0078] We denote S4 the external surface of the rod 4.

[0079] This external surface S4 has a non-circular cross-section on the portion 45 and terminates, on the side of the eyelet 22, with the surfaces S442 and S'442.

[0080] For each rod 4, a parting plane is defined by the mold in which the rod 4 is overmolded onto the link 2. This parting plane corresponds to a closing plane of the two mold portions forming the imprint of the rod 4 around the link 2. This parting plane is parallel to, and in line with, the first transverse face 28 of the link 2. A plane forming the trace of the parting plane on the rail 1 is denoted ir. The plane tt includes the first transverse face 28 and the cover surface S448.

[0081] As can be seen from the comparison of inserts A and B in [Fig.7], the external shape of the end 44 is different when viewed from the side of the first transverse face 28 or from the side of the second transverse face 29. In other words, the geometry of the external surface S4 is different depending on whether one considers one side or the other of the rod 4, with respect to the plane ji, on the rod 4. This geometry is imposed by the impression of the mold used during the overmolding operation.

[0082] More precisely, in a part of the second longitudinal end 44 along the longitudinal axis XI, the width 1'44 is strictly less than the width 144.

[0083] A cavity C44 is formed by the rod 4 and the link 2 on each side of the second longitudinal end 44, with respect to a plane containing the axes XI and Zl. This cavity extends, along the transverse axis Yl, beyond the part of the link 2 that is covered by the second end 44 of the rod 4.

[0084] The two cavities C44 formed on the second longitudinal end 44 are symmetrical to each other with respect to the plane containing the axes XI and ZL. The following description applies to either of these cavities. The second longitudinal end mentioned below is the second longitudinal end- tudinal 44 of one of the stems 4.

[0085] The cavity C44 is defined by a first surface SI of the link 2, by a second lateral surface S2 of the rod 4 and by a third bottom surface S3 of the rod 4.

[0086] The bottom surface S3 extends, in the direction of the first longitudinal end 42, in particular along the longitudinal axis XI, the first overlap surface S448 formed by the second longitudinal end 44. In other words, the junction between the bottom surface S3 and the first overlap surface S448 is a line contained in the plane formed by the first overlap surface S448. In the first embodiment, and advantageously, the bottom surface S3 lies in the plane ji. The surfaces S3 and S448 are therefore coplanar. The third bottom surface S3 is an extension, along the longitudinal axis XI and beyond the peripheral surface 31, of the first transverse face 28 of the link 2. In the first embodiment, and advantageously, the surface S3 and the first transverse face 28 are also coplanar.

[0087] Alternatively, the surfaces S3 and S448, i.e. the surface S3 and the first transverse face 28, are substantially coplanar without being strictly coplanar, forming between them an angle of less than 10°.

[0088] The first surface SI is formed by a portion of a curved edge 25 of the link 2, which is disposed on the side of the third bottom surface S3 in a direction parallel to the longitudinal axis XL. In other words, the first surface SI is formed by a portion of the peripheral surface 31, at one of the transition zones 26, where the width of the link decreases as it moves away from the eyelet 22 along the longitudinal axis XL.

[0089] The second lateral surface S2 is formed by a portion of the external surface S4 extending towards the first longitudinal end 42 from a line L44 that forms the intersection between the external surface S4 and the peripheral surface 31 of the link 2. Within the cavity C44, the intersection line L44 delimits the first surface SL. The intersection line L44 defines the junction between the first surface SI and the second surface S2. The second surface S2 is said to be lateral in the sense that the second surface S2 is not parallel to the transverse axis Yl. The second lateral surface S2 therefore extends globally transversely to the axis YL. The second lateral surface S2 delimits the cavity C44 laterally, that is to say along the transverse axis Yl, inwards, that is to say in the direction of the longitudinal axis XL. The line of intersection L44 is arranged at the same longitudinal level as the second covering surface S449.The intersection line L44 extends from the first transverse face 28 to the second transverse face 29. In particular, the intersection line L44 extends from the first cover face S448 to the second surface of re. S449 cover. The intersection line L44 extends, within the cavity C44, from the third bottom surface S3.

[0090] On inset A) of [Fig. 7], the first, second, and third surfaces SI, S2, and S3 are identified by areas with dots of varying densities to facilitate their identification. Similarly, a center line has been added extending from the intersection line L44 to facilitate its identification.

[0091] The third bottom surface S3 extends laterally, that is to say in a direction parallel to the transverse axis Yl, and in a direction away from the longitudinal axis XI, that is to say outwards, with respect to the part of the link 2 located in the same area as this bottom surface S3 along the longitudinal axis XL. In other words, the bottom surface S3 extends to a distance from the plane comprising the axes XI and ZI which is non-zero and which is greater than the distance between this plane and the portions of the peripheral surface 31 embedded in the material of the second longitudinal end 44, in particular the lateral edges 27 of the longitudinal legs 24.

[0092] Thus, each cavity C44 is offset from the link 2 parallel to the transverse axis YL

[0093] Furthermore, each cavity C44 is advantageously offset from the link 2 parallel to the longitudinal axis XL. In other words, the third bottom surface S3 extends in a direction parallel to the longitudinal axis XI, towards the first longitudinal end 42, relative to the part of the link 2 located in the same area as this bottom surface S3 along the longitudinal axis YL

[0094] In this case, the cavity C44 is offset from the link 2 parallel to all directions of the transverse faces 28 and 29 of this link, that is to say in all directions parallel to the overlapping surfaces S448 and S449. In other words, the cavity C44 is arranged laterally on the outside of the link and longitudinally beyond, in the direction of the first longitudinal end 42, the parts of the link not covered by the second end 44.

[0095] A first re-entrant edge Al is defined at the junction between the first surface SI and the third bottom surface S3. This edge Al also corresponds to the junction line between the first cover surface S448 and the third bottom surface S3. This edge Al extends to the intersection line A44.

[0096] A second re-entrant edge A2 defines the junction between the second lateral surface S2 and the third bottom surface S3. The second lateral surface S2 and the third bottom surface S3 meet at edge A2. Edge A2 extends globally along the longitudinal axis XL

[0097] An external edge A3 delimits the third bottom surface S3 laterally outwards. The edge A3 is a joining edge between an end of the edge Al opposite the intersection line L44 and an end of the joining edge A2 opposite this same line of intersection. This edge A3 is salient and connects the third bottom surface S3 to a portion S44 of the external surface S4, which defines the external shape of the second longitudinal end 44 on the side of the transverse face 28 of the link 2, i.e., the side visible in insert B) of [Fig. 7]. In other words, the bottom surface S3 opens onto the portion S44 of the external surface S4. The portion of surface S44 extends the surface S442 away from the eyelet 22.

[0098] In other words, the C44 cavity is defined by - a re-entrant dihedral angle between surfaces SI and S2, with the intersection line L44 as the common line, - a re-entrant dihedral angle between surfaces SI and S3, with edge Al as the common line, and - a re-entrant dihedral between surfaces S2 and S3, with edge A2 as a common line.

[0099] Each of the cavities C44 constitutes a reinforcement in which the presence of burrs is not prohibitive because these burrs do not risk coming into contact with warp threads near the heddle 1, when the latter is integrated into the harness H and when the loom M is in operation.

[0100] In particular, on each side of the plane XI, Zl, each cavity C44 constitutes a recess for the line of intersection L44 which is the unique junction of the external surface S4 of the rod 4 with the peripheral surface 31 of the link 2 on this side of the plane XI, Yl.

[0101] We denote ji' a plane parallel to the axes XI and Yl and which includes the transverse face 29 and the cover surface S449.

[0102] Along the thickness axis Zl, the second lateral surface S2 is contained between the planes ir and jt'.

[0103] A portion of the external surface S4 located on the side of the plane ji' opposite the lateral surface S2 is designated S'44. The portion of surface S'44 is visible in inset A) of [Fig.7] and opposite the portion of surface S44. It extends the surface S'442 away from the eyelet 22.

[0104] The width 144 is the width of the surface S44 and the width 1'44 is the width of the surface S'44, measured parallel to the transverse axis YL. The widths 144 and 1'44 are decreasing from the bottom surface S3 and approaching the free edge of the heel 442.

[0105] The third bottom surface S3 extends, in a transverse direction parallel to the transverse axis Yl, outwards, relative to the second lateral surface S2.

[0106] Let e4max be the thickness of the rod 4 measured parallel to the thickness axis Zl, in the portion of the rod 4 with a constant cross-section. Let e44 The thickness of the embedded link 2 in the second longitudinal end 44, on the side of the first transverse face 28. The thickness e44 is the maximum distance, measured parallel to the thickness axis ZI at the longitudinal level of the cavities C44, i.e., longitudinally between the intersection of edges A3 and A2 and the intersection of edges A3 and A1, between the plane of the first cover surface S448 and the surface S44. We denote e'44 the thickness of the embedded link 2 in the second longitudinal end 44, on the side of the second transverse face 29. The thickness e'44 is the maximum distance, measured parallel to the thickness axis ZI at the longitudinal level of the cavities C44, between the plane of the second cover surface S449 and the surface S'44. We have the following relationship: e4max = e2 + e44 + e'44 (equation 1)

[0107] Each of the thicknesses e44 and e'44 is greater than or equal to the thickness e2. We have the following relationships:

[0108] e44 > e2 (equation 2)

[0109] e'44 > e2 (equation 3)

[0110] At the longitudinal level of the cavity C44, the external surface S4 of the rod 4 has a maximum height, measured parallel to the thickness axis ZI with respect to the plane of the first cover surface S448, which is equal to e'44 + e2 and which is therefore greater than or equal to twice the thickness e2.

[0111] A48 is a re-entrant edge extending at the junction between the surface S44 and the transverse face 28. This edge lies in the plane ir and borders the cover surface S448 on the outside. A49 is a re-entrant edge extending at the junction between the surface S'44 and the transverse face 29. This edge lies in the plane ji' and borders the cover surface S449 on the outside. Each line of intersection L44 of each of the two cavities C44 present on the rod 4 extends to the edge A49.

[0112] When the heddle 1 is integrated into the harness H, the adjacent warp threads can be considered straight because they are taut and extend generally in a direction transverse to the axis XL. In this case, if one of these threads happens to rub against the second longitudinal end 44, it comes into contact with one or the other of the surfaces S44 or S'44 but cannot penetrate into one of the cavities C44, given their geometry. Under these conditions, such a thread is not at risk of being snagged, damaged, or severed by burrs located inside this cavity.

[0113] Now, it is inside each cavity C44 that burrs are most likely to form, along the line of intersection L44 and / or along one of the edges Al and A2.

[0114] Different positions of a warp wire 108 bearing against the second longitudinal end 44 of the heddle 1 are represented by thick dashed lines on the section CC of [Fig.6]. The geometry of the second longitudinal end 44 keeps the warp wire 108 outside the two cavities C44, away from the edges Al, A2 and the line L44.

[0115] Edge A3 is flat and lies in plane ji, and is therefore parallel to axes XI and Yl. Its concavity faces the plane containing axes XI and ZI, and thus the second lateral surface S2. In other words, edge A3 is convex outwards between edges A1 and A2, in a plane parallel to axes XI and Y1.

[0116] On the other hand, no surface of the smooth 1 faces the cavity C44 away from the third bottom surface S3 along the thickness axis ZI perpendicular to this third bottom surface, and therefore perpendicular to the cover surface S448. In other words, the cavity C44, and in particular the third bottom surface S3, the first surface SI, and the second lateral surface S2, are unrelated in a direction DI parallel to the thickness axis ZI and away from the portion of the second longitudinal end 44 of the rod 4 that forms this surface S3. This makes it possible to create the cavity C44 using a mold with a parting line ir and without a slide, which is advantageous in terms of cost, reliability of the overmolding operation, and reduction of burrs.

[0117] The first surface SI and the joining edge A3 each have a projection, in a plane parallel to the longitudinal and transverse axes XI and Yl, which is an arc of a circle. RI denotes the radius of curvature of the projection of the surface SI in a plane parallel to the axes XI and Yl, that is, of the portion of the curved edge that delimits the cavity C44. R3 denotes the radius of curvature of the projection of the edge A3 in the same plane parallel to the axes XI and Yl. The radii of curvature RI and R3 are shown in [Fig. 6]. The radius of curvature R3 is greater than or equal to the radius of curvature RI, preferably greater than or equal to 1.5 times this radius RI.

[0118] This relatively large radius of curvature R3 of the edge A3, compared to that of the curved edge 25, gives the bottom surface S3 a tapered geometry, advantageous for preventing a warp wire 108 from entering the cavity C44 defined by this junction edge A3.

[0119] Each housing 32 is arranged, along the longitudinal axis XI, predominantly on the side of the eyelet 22 relative to the cavities C44 of the second adjacent longitudinal end 44. In particular, the proximal portion 323 of a housing 32 is arranged, along the longitudinal axis XI, between the nearest cavities C44 and the eyelet 22. In an alternative not shown, the distal portion 325 of a housing 32 is arranged, along the longitudinal axis XI, between the nearest cavities C44 and the eyelet 22.

[0120] For each rod 4, each cover surface S448, S449 is predominantly, preferably exclusively, located at the longitudinal level of each cavity C44 as well as on the longitudinal side of the eyelet 22 relative to each cavity C44.

[0121] Advantageously, at each second longitudinal end 44, the two cavities C44 have first surfaces SI, two second lateral surfaces S2 and third bottom surfaces S3 which are not opposite each other along the same direction DI perpendicular to the transverse faces 28 and 29 of the link 2. In addition, the two third bottom surfaces S3 of the two cavities C44 of the same rod 4 are coplanar.

[0122] In practice, taking into account that two cavities C44 are provided at each of the second longitudinal ends 44 of the two rods 4, the smooth 1 has four cavities C44. The four third bottom surfaces S3 of these four cavities C44 are advantageously coplanar, which makes it possible to use, for overmolding the rods 4, a single parting line for the overmolding mold of the two rods 4, which simplifies the manufacture of this mold and also reduces the burrs at this parting line.

[0123] The plane ir is offset from the median plane of the eyelet 22, which contains the axes XI and Yl, by half the thickness e2 of this eyelet. This allows the third bottom surface S3 to be in line with the cover surface S448 and the transverse face 28.

[0124] Furthermore, the distance d43 is equal to half the thickness e2. Thus, the axis X43 lies in the plane ir and the plane of symmetry X43, Y43 of portion 43 of the rod 4 is coplanar with the third bottom surface S3 of each cavity C44. This implies that portion 43 of each rod 4 is symmetrical with respect to the parting line of the mold.

[0125] The second longitudinal ends 44 of the two rods 4 are symmetrical to each other with respect to a plane parallel to the axes Yl and ZI and passing through the center of the eyelet 22. This has the effect that the plane ir is the same for both rods. Again, this simplifies the mold manufacturing and limits burrs.

[0126] Let d3 be a distance measured between the joining edge A3 and the intersection line L44. Advantageously, the minimum value of the distance d3 is greater than or equal to half the thickness e2 of the link 2. When the joining edge A3 lies in the plane ji, then d3 is the distance measured in the plane ir between the joining edge A3 and the trace of the intersection line L44 in that plane. In practice, the minimum value of the distance d3 can be chosen between 0.1 and 0.15 millimeters, which gives good results for sufficiently separating the warp threads 108 from the burrs present inside the cavity C44, without significantly widening or adding weight to the shank 4.

[0127] In view of the foregoing, it is understood that the cavities C44 have the effect that the intersections between the rods 4 and the link 2 which are the most critical in terms of burr formation, namely the intersections which are essentially perpendicular to the longitudinal axis XI, in particular at the line of intersection L44 and the The edges Al are set back in each cavity C44, therefore at a distance from a neighboring warp thread 108 which rests on one or the other of the surfaces S44 or S'44, as shown in section CC of [Fig.6].

[0128] This is particularly true at the level of the intersection line L44 which is perpendicular, within 10°, to the third bottom surface S3.

[0129] In an unrepresented variant, the intersection line L44 is curved.

[0130] Burrs can also be created during the overmolding operation, on essentially straight portions of the stem 4, parallel to the longitudinal axis XI and located outside the second end 44, therefore outside the cavities C44. These burrs are less aggressive than those that can be created in areas that are not parallel to the longitudinal axis XI.

[0131] Other burrs can also be created along the re-entrant edges A48 and A49, but they are not likely to catch warp threads 108 because these are straight and come to rest against the peripheral surface 31 of the link 2 and against one of the surfaces S44 and S'44, without touching the edges A48 and A49.

[0132] In the second and third modes of operation shown in Figures 8 and following, the elements analogous to those of the first embodiment bear identical reference numerals. If a reference numeral appears in one of Figures 8 and following without being mentioned in the rest of the description, or is mentioned in the description but not shown in those figures, it refers to the same element as the one bearing the same reference numeral in the first embodiment. The following primarily describes what distinguishes the Jacquard guide rails of these second and third embodiments from those of the first embodiment.

[0133] In the second embodiment, the slots 32 of the link 2 are notches that open onto the longitudinal ends of this link. In other words, there are no tabs comparable to the longitudinal tabs 24 of the first embodiment, and the contour of the slots 32 is open. This contour does not include a portion comparable to the distal portion 325 of the first embodiment. The peripheral surface 31 is defined outside the contour of the slots 32 and outside the eyelet 22 and includes the longitudinal edges 21 and the curved edges 25.

[0134] Another difference from the first embodiment is that the link 2 has a thickness e2, measured parallel to the thickness axis Z2, which is not constant. This thickness is greater in the central portion 20, which defines the eyelet 22, than in the transition zone 26, as can be seen in [Fig. 9]. The transverse faces 28 and 29 are parallel to the axes XI and Y1, except for the portion of the transverse face 28 where the thickness e2 varies.

[0135] The trace of the S448 cover surface is greyed out on [Fig.9].

[0136] Two cavities C44 are respectively formed on either side of a plane containing the axes XI and ZI of the second longitudinal end 44 of the rod 4, each being defined by a first surface SI, a second lateral surface S2 and a third bottom surface S3. The cavities C44 have substantially the same geometry as in the first embodiment.

[0137] The variable nature of the thickness e2 allows the plane ir in which the third bottom surface S3 of the cavities C44 is located to be coplanar with the median plane of the link 2 defined by the axes X2 and Y2 at the center C22 of its eyelet 22. In other words, the geometry of the link 2, which has a visible reduction in thickness in [Fig.9] allows the parting plane of the mold, therefore the plane ir defined as in the first embodiment, and the third bottom surface S3 of the cavity 44 to be aligned with the median plane of the link 2.

[0138] In this embodiment, the anchoring lug 442 does not completely fill the housing 32 in which it is overmolded. In particular, no part of the lug 442 has surfaces comparable to the surfaces S442 and S'442 of the first embodiment. A free edge 442A of the anchoring lug 442 extends, along the longitudinal axis XI, to a non-zero distance d442 from the proximal portion 323 of the unclosed contour of the housing 32 in which this anchoring lug 442 is overmolded. The anchoring lug 442 passes completely through the housing 32, between the transverse faces 28 and 29 of the link 2. In this second embodiment, the free edge 442A of the anchoring lug forms the free edge 44A of the second end 44 of the stem 4.

[0139] In the third embodiment, the two cavities C44 defined on either side of a plane containing the axes XI and ZI of a second longitudinal end 44 of a rod 4 of the rail 1 have their respective third bottom surfaces S3 which are not coplanar but defined respectively as extensions of two overlap surfaces S448 and S449 formed by the second longitudinal end 44 and which partially cover, at the transition zones 26, respectively the transverse faces 28 and 29 of the link 2. The trace of the overlap surface S448 is shaded in gray in [Fig. 10]. This overlap surface S448 is not symmetrical with respect to the plane containing the axes XI and ZI.

[0140] The third bottom surfaces S3 of the two cavities C44 arranged on either side of a second longitudinal end 44 are defined by two parallel and offset planes ir and ji', parallel to the thickness axis Zl, by a distance dir equal to the thickness e2 of the link 2 at the transition zones 26. In this embodiment, there is therefore not a single parting line for the mold in which each rod 4 is overmolded onto the link 2. However, on the rod 4, on each side of the plane XI, Yl, the parting line extends exclusively in the plane ji, respectively in the plane ji', which limits the formation of overmolding burrs that could create snags for the neighboring warp threads.

[0141] The two cavities C44 are not limited along respective directions DI and D'1 which are perpendicular to the covering surfaces S448 and S449, parallel to the axis Z1, and each oriented away from the portion of the second longitudinal end 44 of the rod 4 which defines the respective bottom surface S3. These two directions DI and D'1 are opposite to each other, namely directed upwards for the direction DI considered for cavity C44 shown on the right of section CC of [Fig. 10] and downwards for the direction D'1 considered for cavity C44 shown on the left of this section.

[0142] In this third embodiment, the link 2 is identical to that of the first embodiment. The heel 442 extends to the proximal portion 323 of the contour of the housing 32, with surfaces S442 and S'442 defined as in the first embodiment which are respectively parallel to the transverse faces 28 and 29 of the link 2, which are not flush with these transverse faces 28 and 29 but located set back from them, towards the inside of the housing 32, so as not to catch the neighboring warp threads 108 when they move in contact with the link 2.

[0143] Using the same notation conventions as for the first embodiment, we have the following relationships:

[0144] e4max = e2 + e44 + e'44 (equation 1)

[0145] e44 > e2 (equation 2)

[0146] e'44 > e2 (equation 3)

[0147] In this third embodiment, as in the first embodiment, the part of the anchor heel 442 bearing against the proximal portion 323 of the closed contour of the housing 32 forms the free edge 44A of the second end 44 of the stem 4.

[0148] In a non-shown embodiment of the invention, the two cavities C44 of the upper rod 4, which carries the attachment means 11A, are unobstructed in a first direction perpendicular to the adjacent cover surface, while the two cavities C44 of the lower rod 4, which carries the attachment means 11B, are unobstructed in a second direction perpendicular to the adjacent cover surface, the second direction being opposite to the first direction. In other words, the cavities C44 provided on the upper and lower rods are not limited, perpendicular to their respective third bottom surfaces S3, in directions that are opposite between the upper and lower rods.In this case, and if for each rod 4, the third bottom surfaces S3 are coplanar, the mold joint plane for the upper rod 4 is offset, along the thickness axis Zl, relative to the mold joint plane for the lower rod 4, by a distance equal to the thickness e2 if the link is of constant thickness as in the first and third embodiments.

[0149] According to another unrepresented variant of the invention, the bottom surface S3 of at least one of the cavities C44 is not flat.

[0150] According to another variant, also not shown, the bottom surface S3 of a cavity C44 is not coplanar with a transverse face of the link; that is, it is not coplanar with the cover surface it extends, but is inclined with respect to it. In this case, the bottom surface S3 does indeed extend the cover surface, of the type of surface S448 or S449 mentioned above, but is not parallel to the median plane of the link 2 defined by the axes X2 and Y2.

[0151] Alternatively, regardless of the embodiment, link 2 can be made of ceramic.

[0152] According to another variant, also not shown, of the invention, each housing 32 can be formed of several recesses, for example of several holes with a circular cross-section juxtaposed along the longitudinal axis X2.

[0153] According to another variant also not shown of the invention, each housing 32 can be formed by one or more notches made from the peripheral surface 31 of the link and opening onto the outside of the link 2 parallel to the transverse axis Yl, for example at the level of the lateral edges 27 of the longitudinal tabs 24.

[0154] According to another variant, also not shown, of the invention, each housing 32 is non-through along the thickness axis Zl.

[0155] In all embodiments, the housing 32 allows the rod 4 to be anchored in the link 2 by means of the anchoring heel 42, this anchoring opposing the separation of the rod and the link parallel to the longitudinal axis XI.

[0156] According to yet another unshown embodiment of the invention, the first surface SI that delimits a cavity C44 comprises, as in the embodiments shown in the figures, a portion of the surface parallel to the plane defined by the axes XI and Yl. This first surface SI may also comprise a portion of the lateral edges 21, parallel to the plane defined by the axes XI and Zl.

[0157] According to yet another unrepresented variant of the invention, the rods 4 are overmolded onto the attachment means 11A and / or 11B, particularly in the case where the materials of these attachment means are different from that of the rod 4.

[0158] According to yet another unrepresented variant of the invention, the link 2 comprises a single longitudinal end leg 24.

[0159] According to yet another unrepresented variant of the invention, a single cavity C44 according to the invention is formed on a rod 4, at the level of its second end 44, on one side only of a plane containing the axes XI and Zl.

[0160] According to yet another unshown variant of the invention, the smooth 1 comprises a only one rod 4 or only one of the rods 4 of the smooth body 10 is provided with one or two cavities C44. In other words, the invention is implemented at the level of a single rod 4.

[0161] Regardless of the embodiment or variant of the invention, the presence of at least one cavity C44 on at least one second end 44 of a rod 4 makes it possible to position the areas of the heddle where overmolding burrs are most likely to form, namely the line of intersection L44 and the re-entrant edge Al, recessed inside the cavity C44. These areas are not reached by neighboring warp threads 108 when the heddle is integrated into a Jacquard-type loom harness H, which greatly limits, or even eliminates, the risk of these warp threads catching on the burrs. This reduces the need for burr removal operations accordingly.As the cavity C44, and in particular the third bottom surface S3, the first surface SI and the second lateral surface S2 of the cavity C44, are without facing in a direction DI parallel to the axis ZI and away from the portion of the second longitudinal end 44 which defines this bottom surface S3, the cavity C44 does not need a drawer to be formed by overmolding in a mold whose parting plane(s) are perpendicular to the axis Zl, which has little tendency to generate burrs.

[0162] The embodiments and variants envisaged above may be combined, provided that this is technically feasible.

Claims

Claims

1. Heddle (1) for guiding a warp thread (108) for a weaving loom (M) equipped with a Jacquard mechanism (102), the heddle extending in length along a longitudinal axis (XI) and comprising: - a link (2), with an eyelet (22) for passing the warp thread, the eyelet passing through the link between a first transverse face (28) and a second transverse face (29) of the link, the first and second transverse faces being connected to each other by a peripheral surface (31) of the link - at least one rod (4) made of polymer material which extends along the longitudinal axis, which is provided with an external surface (S4) and which comprises • a first longitudinal end (42) provided with means (1 IA; 1 IB) for connection to a member (106, 110) of a harness (H) of the Jacquard mechanism and • a second longitudinal end (44) in one piece which comprises at least • a first covering surface (S448) which partially covers the first transverse face (28) of the link, • a second covering surface (S449) which partially covers the second transverse face (29) of the link, and • an anchor heel (442); wherein the first covering surface (S448) and the second covering surface (S449) are parallel to the longitudinal axis (XI) and to a transverse axis (Y 1), perpendicular to the longitudinal axis (XI); in which the link (2) cooperates with the anchor heel (442) of the rod (4) to oppose a separation of the rod and the link parallel to the longitudinal axis (XI), characterized in that - the rod (4) and the link (2) form, at the second longitudinal end (44) of the rod, at least one cavity (C44) which is offset from the link (2) in a direction parallel to the longitudinal axis (XI) and which is delimited by • a first surface (SI) formed by a portion of the peripheral surface (31) of the link (2); • a second lateral surface (S2) formed by a portion of the external surface (S4) of the rod (4), this second lateral surface extending in the direction of the first longitudinal end (42) of the rod, from a line of intersection (L44) between the peripheral surface (31) of the link and the external surface (S4) of the rod; • a third bottom surface (S3) formed by the rod (4) and extending one of the first and second covering surfaces (S448; S449) in the direction of the first longitudinal end (42) of the rod; - within each cavity, the intersection line (L44) extends from the third bottom surface (S3) and delimits the first surface (SI); - for each cavity (C44), the third bottom surface (S3) is arranged in a direction parallel to the transverse axis (Yl), towards the outside of the rod (4) relative to the second lateral surface (S2); and - each cavity (C44) is not opposite, along a thickness axis (Zl), perpendicular to the longitudinal and transverse axes, in a direction (Dl, D' 1) moving away from a portion of the rod (4) which forms the third bottom surface (S3) of the cavity.

2. A stringer according to claim 1, wherein the third bottom surface (S3) of each cavity (C44) is coplanar or substantially coplanar with the covering surface (S448; S449) which it extends.

3. A rail according to any preceding claim, wherein - the link comprises at least one housing (32) passing through the link between the first transverse face (28) and the second transverse face (29) of the link; - the anchor heel passes through the housing (32) of the link from one side to the other along the thickness axis (Zl); - a contour surface of the housing (32) comprises a proximal portion (323), arranged longitudinally on the side of the eyelet (22); - the proximal portion (323) of the housing (32) is arranged, along the longitudinal axis (XI), between the cavity or cavities (C44) formed at the level of the rod (4) and the eyelet (22); - the anchor heel (442) forms the free edge (44A) of the second longitudinal end (44); - the first and second covering surfaces (S448, S449) of the rod (4) extend to the anchor heel (442).

4. A rod according to claim 3, in which - the anchoring heel (442) of the second longitudinal end (44) of the rod (4) is delimited by two surfaces (S442, S'442) respectively parallel to the first and second transverse faces (28, 29) of the link; and - the anchoring heel (442) bears longitudinally against the proximal portion (323) of the contour surface of the housing (32).

5. A rail according to any preceding claim, wherein the intersection line (L44) extends to an edge (A49) which borders the second covering surface (S449).

6. A rail according to one of the preceding claims, in which - the rail (1) comprises two rods (4) made of polymer material, each with a first longitudinal end (42) and a second longitudinal end (44); - the second longitudinal ends (44) of the two rods each partially cover the first and second transverse faces (28, 29) of the link; - two cavities (C44) are formed at the second longitudinal end (44) of each rod on either side of a plane containing the longitudinal (XI) and transverse (Y 1) axes and passing through a geometric center (C22) of the eyelet.

7. Smooth according to claim 6, in which - the two cavities (C44) formed at the level of the same second longitudinal end (44) of the same rod (4), are not opposite each other in the same direction (Dl) parallel to the thickness axis (Zl); - the link (2) is flat and symmetrical with respect to a geometric center (C22) of the eyelet.

8. A rail according to any preceding claim, wherein the first surface (SI) is formed by a portion of the peripheral surface (31) of the link (2) in a transition zone (26) of the link where the width of the link, taken along the transverse axis (Y 1), decreases away from the eyelet (22) along the longitudinal axis (XI).

9. A rail according to one of the preceding claims, in which the third bottom surface (S3) is delimited along the transverse axis (Yl) towards the outside of the rod (4) by a joining edge (A3) which connects the third bottom surface (S3) to the external surface (S4) of the rod (4), which is curved and whose concavity is turned towards the second bottom surface (S2).

10. A rail according to claim 9, wherein the joining edge (A3) extends at a distance (d3) from the intersection line (L44), a minimum value of which is greater than or equal to half the thickness (e2) of the link, measured between the first and second overlapping surfaces (S448, S449) along the thickness axis (Zl).

11. A stringer according to one of claims 9 or 10, wherein a radius of curvature (R3) of the projection of the joining edge (A3) in a plane parallel to the longitudinal and transverse axes (XI, Yl) is greater than or equal to a radius of curvature (RI) of the projection of the first surface (SI) in this plane, preferably at least 1.5 times greater.

12. Rail according to one of the preceding claims, in which, at the longitudinal level of the cavity (C44) and on the side of each covering surface (S448; S449) along the thickness axis (Zl), the second longitudinal end (44) of the rod (4) has a thickness (e44, e'44), measured along the thickness axis (Zl) relative to the plane formed by the covering surface, which is greater than or equal to a thickness (e2) of the link measured between the first and second overlapping surfaces.

13. A rail according to one of the preceding claims, in which, on the side of each covering surface along the thickness axis (Zl), the second longitudinal end (44) of the rod (4) has, longitudinally between the third bottom surface (S3) and a free edge (44A) of the second longitudinal end (44), - a width (144, 1'44), measured parallel to the transverse axis (Y 1), decreasing in the direction of the free edge (44A); and - a thickness (e44, e'44), measured along the thickness axis (Zl), decreasing in the direction of the free edge (44A).

14. A rail according to any preceding claim, wherein the link (2) comprises at least one longitudinal end tab (24) which is completely surrounded by the second longitudinal end (44) of the rod (4).

15. Weaving loom (M) equipped with a Jacquard mechanism (102) and several heddles (1) for guiding a warp thread (108), characterized in that at least one of the heddles (1) is according to one of the preceding claims.

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