Jacquard heddle and loom including such a Jacquard heddle

Abstract

Jacquard heddle and loom comprising such a Jacquard heddle. Jacquard heddle (6) comprising a link (8), having an upper hole (83) and a lower hole (85) of circular cross-section. A first monofilament yarn (65A) enters the upper hole, forming an upper loop (67A), and a second monofilament yarn (65B) enters the lower hole, forming a lower loop (67B). The Jacquard heddle (6) comprises an upper end connector (60A) to which two end portions (69A) of the first yarn (65A) are attached, and a lower end connector (60B) to which two end portions (69B) of the second yarn (65B) are attached. The upper loop (67A) delimits a free opening (671A) extending from the upper hole to the point where the two end portions of the first yarn are joined to the upper end connector.The lower loop defines a free opening (671B) extending from the lower hole to the connection of the two end portions of the second wire with the lower end connector. Figure for the abbreviation: Figure 2.

Description

Title of the invention: Jacquard heddle and loom comprising such a Jacquard heddle

[0001] The present invention relates to a Jacquard heddle and a loom comprising such a Jacquard heddle.

[0002] The heddles of a Jacquard loom must limit their impact on the warp yarn density and limit snagging of neighboring warp yarns. During weaving on a Jacquard loom, particularly when the warp yarns are thick, the heddle links can be carried in the direction of warp yarn feed, resulting in heddle bending out of the longitudinal plane, or contact between the heddle link and neighboring warp yarns can cause misalignment of the heddle body and the heddle link in the longitudinal plane. In a Jacquard loom, the heddles are particularly long compared to a frame loom, and therefore prone to bending in the direction of warp yarn feed.

[0003] JPS55139185 describes a heddle for a loom frame, which is therefore not a Jacquard loom. The heddle consists of a link, an upper thread, and a lower thread. The upper thread is inserted into an upper triangular slot in the link, and the lower thread is inserted into a lower triangular slot in the link. To be hooked into the triangular slot, each thread is twisted around itself, forming a braid.

[0004] JP2001303384 discloses another construction, in which two wires are twisted around an added annular link.

[0005] These known heddles would be poorly suited to a Jacquard loom, particularly in cases where the warp threads are thick and exert significant bending stress on the heddle link along the feed direction. Indeed, these known heddles do not withstand the stresses imposed by the Jacquard loom well, because when the heddles are deformed by bending out of the longitudinal plane, the twists forming the connections between the heddle bodies and the link are subjected to high stress. This can cause crack initiation and premature wear of the heddles, especially the twists. Furthermore, these known heddles are not protected from corrosive environments, which tends to promote such crack initiation.

[0006] The aim of the invention is then to propose a new Jacquard heddle, thanks to which the risk of breakage of the heddle is reduced, in particular when a warp thread passing through the heddle is thick.

[0007] To this end, the invention relates to a Jacquard heddle for guiding a warp thread on a Jacquard loom, the Jacquard heddle extending along a longitudinal axis and including:

[0008] - a link, comprising a convex outer edge and two flat principal faces, parallel and opposite to each other, the link being crossed, from one of the main faces to the other, by an eyelet for the passage of the warp thread, by an upper hole and by a lower hole, the upper hole and the lower hole being arranged on either side of the eyelet along the longitudinal axis;

[0009] - a first wire, entering the upper hole by forming an upper loop; And

[0010] - a second wire, which is separate from the first wire and which engages in the lower hole forming a lower loop.

[0011] According to the invention:

[0012] - the Jacquard smooth includes an upper end connector, comprising means of connection to a first element of a Jacquard harness, two end portions of the first wire being connected to the upper end connector; and

[0013] - the Jacquard smooth includes a lower end connector, comprising means of connection to a second element of the Jacquard harness, two end portions of the second wire being connected to the lower end connector;

[0014] - the upper loop delimits a free opening extending along the long axis gitudinal, from the upper hole to the connection of the two end portions of the first wire with the upper end connector;

[0015] - the lower loop delimits a free opening extending along the long axis gitudinal, from the lower hole to the connection of the two end portions of the second wire with the lower end connector;

[0016] - the first wire is the only link between the link and the upper end connector and is a monofilament wire of constant diameter;

[0017] - the second wire is the only link between the link and the lower end connector and is a monofilament wire of constant diameter;

[0018] - the upper hole has a circular cross-section; and

[0019] - the lower hole has a circular cross-section.

[0020] Thanks to the invention, when the heave is flexed by being driven in a forward direction by the warp thread passing through the eyelet, a pivoting of the link relative to the upper body is permitted, by pivoting of the upper hole in the free opening of the loop of the upper body. Similarly, a pivoting of the link relative to the lower body is permitted, by pivoting of the lower hole in the free opening of the loop of the lower body. This pivoting of the link within the loops is facilitated by the interaction of the circular thread forming the body with the circular hole of the link in which it is engaged, and allows the heave to deform without generating bending stress at the connection between the link and the upper body, respectively the lower body. The risk of the rail breaking is thus reduced.

[0021] According to other advantageous aspects of the invention, the Jacquard smooth comprises one or more of the following features, taken individually or in all technically possible combinations:

[0022] - a diameter of the upper hole is greater than or equal to twice, preferably 2.5 times the diameter of the first wire and is preferably less than 3.5 times the diameter of the first wire.

[0023] - a diameter of the lower hole, is greater than or equal to twice, preferably 2.5 times the diameter of the second wire, and is preferably less than 3.5 times the diameter of the second wire.

[0024] - the thickness of the link, measured from one of the principal faces to the other, perpendicular relative to the longitudinal axis, is less than twice the smallest diameter between the diameter of the first wire and the diameter of the second wire.

[0025] - the outer edge of the link comprises two central portions which extend according the longitudinal axis and an upper portion, respectively a lower portion, ending with an upper rounding, respectively a lower rounding, and in which the upper portion, respectively the lower portion, corresponds to a progressive reduction in width of the principal faces from the central portions towards respectively the upper rounding, the lower rounding, the width being taken in a direction perpendicular to the longitudinal axis and parallel to the principal faces.

[0026] - the upper rounded edge is centered on the upper hole and extends over at least 100° around the center of the upper hole.

[0027] - the lower rounded edge is centered on the lower hole, and extends over at least 100° around the center of the lower hole.

[0028] - a height of the eyelet, measured parallel to the longitudinal axis, is at least five times greater than the largest diameter between a diameter of the upper hole and a diameter of the lower hole.

[0029] - the link is metallic, preferably stainless steel.

[0030] - the eyelet comprises an upper edge and a lower edge, delimiting the next eyelet the longitudinal axis, the upper edge and the lower edge being perpendicular to the longitudinal axis and in which a width of the eyelet is strictly greater than the larger diameter between the diameter of the upper hole and the diameter of the lower hole, preferably 2.5 to 3.5 times greater.

[0031] - the first wire and the second wire are made of nylon.

[0032] - the first wire and the second wire are metallic.

[0033] - the upper end connector is made of polymer material, overmolded onto the two end portions of the first wire.

[0034] - the lower end connector is made of polymer material, overmolded onto the two end portions of the second wire.

[0035] - the upper end connector includes a through-housing in a direction perpendicular to the longitudinal axis for the partial reception of the two end portions of the first wire which are connected to it.

[0036] - the lower end connector, includes a through-housing in a direction perpendicular to the longitudinal axis for the partial reception of the two end portions of the second wire which are connected to it.

[0037] - the connection between the two end portions of the first wire and the connector The upper end comprises a tube, arranged around the housing and pressing the two end portions of the first wire into contact with the upper end connector.

[0038] - the connection between the two end portions of the second wire and the connector The lower end comprises a tube, arranged around the housing and pressing the two end portions of the second wire into contact with the lower end connector.

[0039] - the connection between the two end portions of the first wire and the connector upper end includes an outer sheath disposed partially around the upper end connector and the first wire.

[0040] - the connection between the two end portions of the second wire and the connector The lower end includes an outer sheath arranged partially around the lower end connector and the second wire.

[0041] The invention also relates to a Jacquard loom comprising several Jacquard heddles, at least one of which conforms to the above.

[0042] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0043] [Fig-1] Fig. 1 is a schematic side view of a Jacquard loom comprising two Jacquard smooths according to a first embodiment of the invention.

[0044] [Fig.2] The [Fig.2] is a front view and a side view of one of the rails of the [Fig.1].

[0045] [Fig.3] The [Fig.3] is a view of a detail A and a detail B of the [Fig.2].

[0046] [Fig.4] The [Fig.4] is a view of a detail C of the [Fig.2].

[0047] [Fig. 5] Fig. 5 is a partial longitudinal section of the smooth surface of the figures shown above. preceding following the section line VV shown on [Fig.4], the rail being shown in an unflexed configuration and in a flexed configuration.

[0048] [Fig.6] [Fig.6] is a front view and a side view of an end connector lower part of the smooth surface of the previous figures, showing a hook of the connector lower end, before the lower end connector is attached to the lower body.

[0049] [Fig.7] The [Fig.7] is a perspective view of a manufacturing step of the smooth of the previous figures.

[0050] [Fig.8] The [Fig.8] is a side view and a front view of a lower end connector belonging to a Jacquard heddle according to a second embodiment of the invention.

[0051] [Fig.9] The [Fig.9] is a front view of a lower end connector belonging to a Jacquard smooth according to a third embodiment of the invention.

[0052] A Jacquard loom 1, according to a first embodiment of the invention, schematically represented in [Fig.1], comprises a Jacquard-type sheaf-forming mechanism 2, a harness 3 in which Jacquard heddles 6 are integrated, a loom frame 7 and warp threads 4. The sheaf-forming mechanism 2 controls several hooks, not shown.

[0053] The harness 3 comprises several arches 32 connecting, respectively, a Jacquard heddle 6 to a lower end of a hook of the sheaf-forming mechanism 2. In the configuration mounted in the harness 3, and excluding any deformation during weaving, each Jacquard heddle 6 is tensioned along a respective longitudinal axis ZI, preferably vertical. The Jacquard heddles 6 are advantageously distributed in depth and across the width of the Jacquard loom 1. Each Jacquard heddle 6 is connected to a respective return spring 34 belonging to the harness 3, the return spring 34 being itself connected to the loom frame 7. Each Jacquard heddle 6 comprises a respective link 8 through which a warp thread 4 passes.With each stroke of the Jacquard loom 1, the sheaf formation mechanism 2 selectively imposes a vertical movement, along the longitudinal axis Zl, of the Jacquard heddles 6 via the arches 32, which brings the warp yarns 4, carried by the Jacquard heddles 6, into different predetermined positions along the longitudinal axis Zl, to form a fabric with the warp yarns 4 and a weft yarn 9 inserted through the sheaf formed by the warp yarns 4 thanks to the positioning of the Jacquard heddles 6. With each stroke of the Jacquard loom 1, the warp yarns 4 advance in a direction of advance XI, perpendicular to the axis ZL.

[0054] The Jacquard helix 6 is shown in more detail in [Fig.2]. The Jacquard helix 6 comprises an upper body 62A, a lower body 62B, a link 8, an upper end connector 60A and a lower end connector 60B.

[0055] The upper body 62A of the Jacquard heddle 6 is the sole link between the link 8 and the upper end connector 60A. The upper end connector 60A is separate from the upper body 62A. The upper body 62A is formed exclusively of a single first yarn 65A, preferably made of nylon, for example polyamide 6 or Polyamide 6.6, with or without additives, monofilament, without twists or corrugations, and advantageously of constant circular cross-section, ideally with a diameter d62A of 0.4 mm (millimeters). The upper body 62A is continuous, and two end portions 69A of the upper body 62A are connected to the upper end connector 60A. The upper body 62A forms an upper loop 67A, visible in Figures 2, 4, and especially 5, which defines a free opening 671A extending longitudinally from the connection of the two end portions 69A of the upper body 62A with the upper end connector 60A, specifically from the lower longitudinal end of this connection, to an upper hole 83 belonging to the link 8.In other words, the two portions of the upper body 62A extending on either side of the hole 83 of the link 8 are only connected at the point where the upper body 62A joins the upper end connector 60A and are not fixed to the link 8. Therefore, in a configuration of the Jacquard heddle 6 not mounted in the harness 3, the upper body 62A can slide within the upper hole 83 of the link 8, within the limit given by the free opening 671 A. The upper body 62A is not twisted around itself or coiled. Ultimately, there is no other connection between the link 8 and the upper end connector 60A than the first wire 65A.

[0056] The lower body 62B of the Jacquard heddle 6 is the sole link between the link 8 and the lower end connector 60B. The lower end connector 60B is separate from the lower body 62B. The lower body 62B is formed exclusively of a second yarn 65B, preferably nylon, for example polyamide 6 or polyamide 6.6 with or without additives, monofilament, without twists or corrugations, and advantageously of constant circular cross-section, ideally with a diameter d62B of 0.4 mm. The second yarn 65B forming the lower body 62B is separate from the first yarn 65A forming the upper body 62A. The lower body 62B is continuous, and two end portions 69B of the lower body 62B are connected to the lower end connector 60B.The lower body 62B forms a lower loop 67B, visible in Figures 2, 4, and especially 5, which defines a free opening 671B extending longitudinally from the connection of the two end portions 69B of the lower body 62B with the lower end connector 60B, specifically from the upper longitudinal end of this connection, to a lower hole 85 belonging to the link 8. In other words, the two portions of the lower body 62B extending on either side of the hole 85 of the link 8 are only joined at the point where the lower body 62B connects to the lower end connector 60B and are not fixed to the link 8. In a configuration of the Jacquard heddle 6 not mounted in the harness 3, the lower body 62B can therefore slide freely in the lower hole 85 of the link 8 within the limit given by the free opening 67 IB. The lower body 62B is not twisted around itself or twisted.Ultimately, there is none. other link between link 8 and lower end connector 60B than the second wire 65B.

[0057] The Jacquard heddle 6 is connected to the return spring 34 by the lower end connector 60B. The lower end connector 60B, visible in Figures 2, 3, 6, and 7, and particularly in Figure 3, detail B, comprises a body 64B, preferably made of polymer, elongated along the longitudinal axis Z1, a hook 66B, preferably made of metal, visible in Figure 6, a tube 61B, and an external sheath 70B, preferably heat-shrink tubing. The body 64B, preferably a threaded section belonging to the body 64B, forms a fastener 63B, through which the body 64B is attached to a first element of the harness 3, in particular to the return spring 34. The body 64B has a maximum transverse dimension dt64B, measured along an axis perpendicular to the longitudinal axis Z1

[0058] As can be seen in [Fig. 6], the hook 66B defines a housing 68B, which passes through in a direction perpendicular to the longitudinal axis ZL. The housing 68B is open along the longitudinal axis ZL in the direction of the body 64B, but closed in the opposite direction. The hook 66B has a maximum lateral dimension d68B measured perpendicular to the longitudinal axis ZL.

[0059] The tube 61B is preferably made of metal and preferably has a general shape of revolution about the longitudinal axis ZL. As shown in [Fig. 7], the tube 61B advantageously forms an internal funnel 61B and an external flange 612B. The tube 61B has an internal dimension d61B, measured along the same axis as the maximum lateral dimension d68B of the housing 68B. The internal dimension d61B is greater than the maximum lateral dimension d68B of the housing 68B but less than the maximum transverse dimension dt64B of the body 64B. The internal dimension d61B is preferably less than the sum of the maximum lateral dimension d68B of the housing 68B and twice the diameter d62B of the lower body 62B. The tube 61B is closed insofar as it extends continuously all around the longitudinal axis ZL.

[0060] The Jacquard helix 6 is connected to the arch 32 by the upper end connector 60A. The upper end connector 60A, visible in [Fig. 2] and in [Fig. 3], detail A, comprises a body 64A, preferably made of polymer, elongated along the longitudinal axis Z1, a hook 66A, preferably made of metal, a tube 61A, and an outer sheath 70A, preferably heat-shrink tubing. The body 64A forms a fastener 63A through which the body 64A is attached to a second element of the harness 3, in particular to the arch 32. The arch 32 is received in an opening delimited by the fastener 63A. The body 64A has a maximum transverse dimension dt64A measured along an axis perpendicular to the longitudinal axis Z1

[0061] The hook 66A delimits a housing 68A passing through in a perpendicular direction The housing 68A is open along the longitudinal axis Z1 towards the body 64A but closed in the opposite direction. The hook 66A has a maximum lateral dimension, not shown, measured perpendicular to the longitudinal axis ZL. This maximum lateral dimension for the hook 66A is measured in the same way as the maximum lateral dimension d66B for the hook 66B.

[0062] The tube 61A is advantageously made of metal, of revolution forming an internal funnel 611A, visible in Figure 3A, and an external flange 612A. An internal dimension d61A of the tube 61A is greater than the maximum lateral dimension of the housing 68A but less than the maximum transverse dimension dt64A of the body 64A. The internal dimension d61A is preferably less than the sum of the maximum lateral dimension of the housing 68A and twice a diameter d62A of the upper body 62A. The tube 61A is closed insofar as it extends without discontinuity all around the longitudinal axis ZL

[0063] The link 8, visible in Figures 1 and 2, and in particular in Figures 4 and 5, is flat. The link 8 comprises a main face 80 and a main face 82 parallel and opposite to the main face 80. The main faces 80 and 82 are planar and each extends in a plane parallel to the longitudinal plane comprising the longitudinal axis Zl and a transverse axis Y1 perpendicular to the longitudinal axis Zl. The longitudinal plane is transverse to the feed direction XL. The link 8 is single-thickness, of a thickness e8, measured between the two main faces 80, 82 perpendicular to the longitudinal axis Zl and to the transverse axis Yl. The thickness e8 is less than twice the smallest diameter between the diameter d62A of the upper body 62A and the diameter d62B of the lower body 62B, preferably less than 1.5 times the smallest diameter between the diameter d62A of the upper body 62A and the diameter d62B of the lower body 62B, advantageously 0.5mm.Link 8 is preferably made of stainless steel. This helps to limit the bulk of the upper loops 67A and lower loops 67B perpendicular to the main faces and therefore to limit the impact of the Jacquard weave on the warp thread density.

[0064] The link 8 comprises an outer edge 84, which delimits the link 8 around its entire periphery. The outer edge 84 surrounds the principal faces 80 and 82 around their entire circumference and connects the principal faces 80 and 82 to each other. The outer edge 84 is closed and convex, with a hexagonal shape. Preferably, the outer edge 84 comprises two opposing, parallel central portions 86A and 86B extending along the longitudinal axis ZL. The outer edge 84 also comprises an upper portion 88A and a lower portion 88B. Each central portion 86A and 86B connects the upper portion 88A to the lower portion 88B.

[0065] The upper portion 88A terminates with an upper rounded end 87A. The portion su The upper portion 88A corresponds to a progressive reduction in the width of the main faces 80 and 82, the width being measured along the transverse axis Y1 and the reduction being carried out from the central portions 86A and 86B towards the upper rounded end 87A along the longitudinal axis Z1. The lower portion 88B ends with a lower rounded end 87B. The lower portion 88B corresponds to a progressive reduction in the width of the main faces 80 and 82, the width being measured along the transverse axis Y1 and the reduction being carried out from the central portions 86A and 86B towards the lower rounded end 87B along the longitudinal axis Z1.

[0066] The link 8 defines an eyelet 81, inside the outer edge 84, passing completely through the link 8, from the main face 80 to the main face 82, i.e., perpendicularly to the longitudinal plane. The eyelet 81 is advantageously rectangular in shape. The eyelet 81 has an upper edge 811 and a lower edge 812, the upper edge 811 and / or the lower edge 812 being advantageously flat and perpendicular to the longitudinal axis ZL

[0067] A height h81 of the eyelet 81, measured parallel to the longitudinal axis Zl, is advantageously 6 mm. The height h81 is at least five times greater than the largest diameter between a diameter d83 of the upper hole 83 and a diameter d85 of the lower hole 85, and strictly greater than twice a width 181 of the eyelet 81, measured perpendicular to the longitudinal axis ZL. Over the entire height h81 of the eyelet 81, the width 181 of the eyelet 81 is strictly greater than the largest diameter between the diameter d83 of the upper hole 83 and the diameter d85 of the lower hole 85; advantageously, the width 181 of the eyelet is 2.5 to 3.5 times the largest diameter between the diameter d83 of the upper hole 83 and the diameter d85 of the lower hole 85. Advantageously, the diameter d83 and the diameter d85 are equal to 1.1 mm. The bulk of the link 8 in a plane parallel to the longitudinal plane therefore remains only slightly impacted by the arrangement of the upper holes 83 and lower holes 85.

[0068] Inside the outer edge 84, the link 8 also defines the upper hole 83, through which the upper loop 67A of the upper body 62A passes, and the lower hole 85, through which the lower loop 67B of the lower body 62B passes. The holes 83 and 85 are arranged on either side of the eyelet 81 in the direction of the longitudinal axis ZL. The holes 83 and 85 are formed outside the eyelet 81.

[0069] The upper hole 83 and the lower hole 85 pass through the link 8 from one side to the other perpendicular to the longitudinal plane, connecting the two main faces 80 and 82 of the link.

[0070] The upper hole 83 passes through the upper portion 88A of the link. The diameter d83 of the upper hole 83 is greater than the thickness e8 of the link 8; advantageously, the diameter d83 of the upper hole 83 is 2 to 2.5 times the thickness e8 of the link 8. The diameter d83 of the upper hole 83 is greater than or equal to twice, preferably The diameter d62A of the upper body 62A is 2.5 times greater and preferably less than 3.5 times greater than the diameter d62A of the upper body 62A. These dimensional relationships ensure that the upper body 62A can pivot in the upper hole 83 when the link 8 is pushed by the warp threads 4 along the feed direction XI and / or in the longitudinal plane during weaving. Thus, the bending stress on the Jacquard heddle 6 does not induce a risk of breakage at the connection between the link 8 and the upper body 62A.

[0071] The upper rounded end 87A is centered on the upper hole 83 and extends over at least 100°, preferably 120°, symmetrical with respect to the longitudinal axis ZI and with a tolerance of plus or minus 20°. The difference in radii between the upper rounded end 87A and the upper hole 83 is equal to the thickness e8 of the link 8, preferably 1 to 1.25 times the thickness e8 of the link 8.

[0072] The lower hole 85 passes through the lower portion 88B of the link. The diameter d85 of the lower hole 85 is greater than the thickness e8 of the link 8; advantageously, the diameter d85 of the lower hole 85 is 2 to 2.5 times the thickness e8 of the link 8. The diameter d85 of the lower hole 85 is greater than or equal to twice, preferably 2.5 times, the diameter d62B of the lower body 62B, and is preferably less than 3.5 times the diameter d62B of the lower body 62B. These dimensional relationships ensure that the lower body 62B can pivot in the lower hole 85 when the link 8 is pushed by the warp threads 4 along the feed direction XI and / or perpendicular to the feed direction XI during weaving. Thus, the stress on the Jacquard 6 rail in bending does not induce a risk of breakage at the connection between the link 8 and the upper body 62A.

[0073] The lower rounded end 87B is centered on the lower hole 85 and extends over at least 100°, preferably 120°, symmetrical with respect to the longitudinal axis ZI and with a tolerance of plus or minus 20°. The difference in radii between the lower rounded end 87B and the lower hole 85 is equal to the thickness e8 of the link 8, preferably 1 to 1.25 times the thickness e8 of the link 8.

[0074] During weaving, since the eyelet 81 is rectangular, the warp yarn 4, especially when it is multi-filament and flat, cooperates optimally with the eyelet 81 which it passes through, especially with the lower edge 812 and the upper edge 811. In particular, the warp yarn 4 cooperates with the minimum deformation of the cross-section of the warp yarn 4.

[0075] Since the free opening 67IB of the lower loop 67B of the lower body 62B around the link 8 is maximal and / or since the main faces 80 and 82 of the link 8 are flat around the lower hole 85, it is possible for the link 8 and the lower body 62B to assume different inclinations, some of which are visible in [Fig. 5], to adapt to the forces exerted by the neighboring warp threads 4 on the Jacquard smooth 6 and warp thread 4 guided by the Jacquard smooth 6. This adaptation therefore occurs with a minimum of constraints between the lower body 62B and the link 8.

[0076] Indeed, due to the circular section of the lower body 62B and the circular section of the lower hole 85, without a concavity being formed by the lower hole 85, and their respective dimensions, the orientation of the lower body 62B in the lower hole 85 is favoured and jamming is avoided.

[0077] Moreover, due to the monofilament structure of the lower body 62B and therefore its constant cross-section over its entire length, the orientation of the link 8, in particular of the main faces 80 and 82, with respect to the second wire 65B occurs without jamming.

[0078] In addition, the lower loop 67B is not constrained by the thickness e8 of the link 8 during deformation out of the longitudinal plane thanks to the relatively small thickness e8 of the link 8 and the minimal difference in radii between the lower rounding 87B and the lower hole 85.

[0079] Finally, due to the monofilament structure of the second yarn 65B forming the lower body 62B and constituting the only link between the link 8 and the lower end connector 60B, contact with the lower body 62B does not cause a snag on a neighboring multifilament warp yarn 4. Furthermore, since the lower rounded end 87B extends widely around the lower hole 85, when the lower body 62B is oriented relative to the link 8 in the longitudinal plane, the sliding of the warp yarns 4 adjacent to the Jacquard heddle 6 of the link 8 towards the lower body 62B and from the lower body 62B towards the link 8 is facilitated.

[0080] As the free opening 671A of the upper loop 67A of the upper body 62A around the link 8 is maximal and / or as the main faces 80 and 82 of the link 8 are flat around the upper hole 83, it is possible for the link 8 and the upper body 62A to take on different inclinations, to adapt to the forces exerted by the neighboring warp threads 4 on the Jacquard heddle 6 and to the warp thread 6 guided by the Jacquard heddle 6. This adaptation occurs with a minimum of stress between the upper body 62A and the link 8.

[0081] Indeed, due to the circular section of the upper body 62A and the circular section of the upper hole 83, without a concavity being formed by the upper hole 83, and their respective dimensions, the orientation of the upper body 62A in the upper hole 83 is favoured and jamming is avoided.

[0082] Moreover, due to the monofilament structure of the upper body 62A and therefore its constant cross-section over its entire length, the orientation of the link 8, in particular of the main faces 80 and 82, with respect to the first wire 65A occurs without jamming.

[0083] Furthermore, the upper loop 67A is not constrained by the thickness e8 of the link 8 during deformation out of the longitudinal plane thanks to the relatively low thickness e8 of link 8 and the minimum difference in radii between the upper rounding 87A and the upper hole 83.

[0084] Finally, due to the monofilament structure of the yarn forming the upper body 62A and constituting the only link between the link 8 and the upper end connector 60A, contact with the upper body 62A does not cause a snag on a neighboring multifilament warp yarn 4. Furthermore, since the upper curve 87A extends widely around the upper hole 83, when the upper body 62A is oriented relative to the link in the longitudinal plane, the sliding of the warp yarns 4 adjacent to the Jacquard heddle 6 of the link 8 towards the upper body 62A and from the upper body 62A towards the link 8 is facilitated.

[0085] The sheath 70B and the tube 61B form part of the connection between the lower body 62B and the lower end connector 60B. The sheath 70B, forming the outer part of this connection, helps to make this connection as smooth as possible, without snagging the neighboring warp threads 4, and protects the tube 61B and the hook 66B from corrosion due to the external environment, for example, in the case of weaving with water. The sheath 70B, by extending around the second thread 65B beyond the tube 61B towards the link 8, limits the free opening 671B along the longitudinal axis ZI towards the lower end connector 60B.

[0086] The sheath 70A and the tube 61A form part of the connection between the upper body 62A and the upper end connector 60A. The sheath 70A, forming the outer part of this connection, helps to make this connection as smooth as possible, without snagging the neighboring warp threads 4, and protects the tube 61A and the hook 66A from corrosion due to the external environment, for example, in the case of weaving with water. The sheath 70A, by extending around the first thread 65A beyond the tube 61A towards the link 8, limits the free opening 671A along the longitudinal axis ZI towards the upper end connector 60A.

[0087] Alternatively, the metal link may be made of ceramic or plastic rather than metal, depending on the textile application and the warp yarns 4 to be woven. Furthermore, the first yarn 65A of the upper body 62A may be made of a material other than nylon, preferably another thermoplastic polymer such as polyetheretherketone (PEEK), or of metal, advantageously stainless steel. The second yarn 65B of the lower body 62B may be made of a material other than nylon, preferably another thermoplastic polymer such as polyetheretherketone (PEEK), or of metal, advantageously stainless steel.

[0088] Alternatively, the lower body 62B is formed exclusively by a second 65B monofilament metal wire and / or the upper body 62A is formed exclusively by a first 65A monofilament metal wire. The end portions 69B of the lower body 62B are joined to the hook 66B by welding and / or the end portions 69A The upper body 62A are connected to the hook 66A by welding.

[0089] A 62A upper body or a 62B lower body made of nylon or stainless steel is compatible with carbon warp threads.

[0090] The link 8 is advantageously produced by cutting a sheet of metal. The upper hole 83, the lower hole 85, the eyelet 81 and the outer edge 84 are cut and then deburred so as to limit the snagging of the chain threads 4.

[0091] After overmolding and folding of the hook 66B, the tube 61B is placed between the fastener 63B and the housing 68B with a possibility of longitudinal movement along the longitudinal axis ZI relative to the hook 66B.

[0092] When the tube 61B is in longitudinal abutment against the body 64B, the tube 61B is offset longitudinally, along the longitudinal axis Zl, relative to the housing 68B.

[0093] During the manufacture of the Jacquard heddle 6, the lower body 62B is passed through the lower hole 85 of the link 8 to form the lower loop 67B, visible in [Fig.5], around the link 8. The end portions 69B of the lower body 62B are connected with a lower end connector 60B.

[0094] As shown in [Fig. 7], the end portions 69B of the lower body 62B are engaged, preferably in the same direction, through the housing 68B, via the housing 68B of the hook 66B of the lower end connector 60B, so as to ensure the correct length of the lower body 62B. Then, the free ends of the lower body 62B are folded down towards the link 8 from the housing 68B. The tube 61B is then moved longitudinally along the longitudinal axis Z1 towards the link 8 around the housing 68B and partially around the two end portions 69B. The funnel facilitates this insertion movement around the housing 68B. The external collar 612B provides support for the tube 61B during its longitudinal movement. The inner surface of the tube 61B presses the end portions 69B of the lower body 62B against the hook 66B.The tube 61B is then plastically deformed around the housing 68B, preferably with a crush in the direction perpendicular to the through direction of the housing 68B before crushing the tube 61B, tightening the hook 66B around the end portions 69B of the lower body 62B to accentuate the clamping of the end portions 69B of the lower body 62B in the housing 68B. The free ends of the lower body 62B, not shown, protruding from the tube 61B are cut off and a heat-shrinkable sleeve, intended to form the sheath 70B, is placed around the tube 61B, the hook 66B, and partially around the body 64B and the second wire 65B and then heated to surround the tube 61B and the lower end connector 60B without play by heat shrinking. The connection of the lower body 62B with the lower end connector 60B therefore includes a blocking of the end portions 69B with respect to the lower end connector 60B. thanks to the tube 61B. After this connection, the body 64B extends beyond the end portions 69B along the longitudinal axis ZI in a direction opposite to the link 8. Preferably, the housing 68B is through along the transverse axis Y1 and the maximum lateral dimension d68B is arranged perpendicular to the transverse axis Yl.

[0095] After overmolding and folding of the hook 66A, the tube 61A is placed between the fastener 63A and the housing 68A with a possibility of longitudinal movement along the longitudinal axis ZI relative to the hook 66A.

[0096] When the tube 61A is in longitudinal abutment against the body 64A, the tube 61A is offset longitudinally, along the longitudinal axis Zl, relative to the housing 68A.

[0097] During the manufacture of the Jacquard heddle 6, the upper body 62A is passed through the upper hole 83 of the link 8 to form the upper loop 67A, visible in [Fig.5], around the link 8. The end portions 69A of the upper body 62A are connected with an upper end connector 60A.

[0098] The end portions 69A of the upper body 62A are engaged, preferably in the same direction through the housing 68A, through the housing 68A of the hook 66A of the upper end connector 60A so as to ensure the correct length of the upper body 62A. Then the free ends of the upper body 62A are folded down towards the link 8 from the housing 68A. The tube 61A is then moved longitudinally along the longitudinal axis Z1 towards the link 8 around the housing 68A and partially around the two end portions 69A. The funnel facilitates this insertion movement around the housing 68A. The external collar 612A facilitates the support of the tube 61A for its longitudinal movement. The inner surface of the tube 61A presses the end portions 69A of the upper body 62A against the hook 66A.Tube 61A is then plastically deformed around housing 68A, preferably by crushing it in the direction perpendicular to the through-direction of housing 68A before crushing tube 61A, tightening hook 66A around the end portions 69A of the upper body 62A to accentuate the clamping of the end portions 69A of the upper body 62A in housing 68A. The free ends of the upper body 62A, not shown, protruding from tube 61A are cut off, and heat-shrink tubing, intended to form sheath 70A, is placed around tube 61A, hook 66A, and partially around body 64A and the first wire 65A, then heated to snugly surround tube 61A and the upper end connector 60A by heat shrinking. The connection of the upper body 62A with the upper end connector 60A therefore includes a blocking of the end portions 69A relative to the upper end connector 60A by means of the tube 61A.After this connection, the 64A body extends beyond the 69A end portions. along the longitudinal axis ZI in a direction opposite to link 8. Preferably, housing 68A is through along the transverse axis Y1 and the maximum lateral dimension is arranged perpendicular to the transverse axis Yl.

[0099] Figure 8 illustrates a second embodiment of the Jacquard helix 6, identical to the first embodiment except for the features described below. The second wire 65B of the lower body 62B is a round, monofilament wire of constant cross-section along its entire length, without twists or undulations, made of stainless steel, with a diameter d62B less than 0.5 times the diameter d85 of the lower hole 85 in which the lower body 62B is engaged. After placing the lower body 62B in the lower hole 85 of the link 8 to form the Jacquard helix 6 of the correct length, the end portions 69B of the lower body 62B are shaped, advantageously with a wave-like form, and overmolded into the body 64B of the lower end connector 60B. The first 65A wire of the upper body 62A is a round monofilament wire of constant cross-section throughout its length, without twist or undulation, made of stainless steel, with a diameter d62A less than 0.5 times the diameter d83 of the upper hole 83 into which the upper body 62A is engaged. After inserting the upper body 62A into the upper hole 83 of the link 8 to form the Jacquard spool 6 of the correct length, the end portions 69A of the upper body 62A are shaped, advantageously with a wave-like form, and overmolded into the body 64A of the upper end connector 60A. The shaping of each end portion 69B, 69A can also be carried out before inserting the lower body 62B into the lower hole 85 and the upper body 62A into the upper hole 83. After overmolding, a sleeve of the heat-shrink tubing type 70A, respectively 70B, can be placed around the body 64A, respectively the body 64B, and partially around the first wire 65A, respectively partially around the second wire 65B. .

[0100] In an unshown variant, the two end portions of one of the upper body 62A and the lower body 62B are formed and overmolded into the body of the associated end connector while the two end portions of the other of the upper body 62A and the lower body 62B are connected to the associated end connector via a tube, as in the first embodiment.

[0101] Figure 9 illustrates a third embodiment of the Jacquard heddle 6, identical to the first embodiment except for the features described below. A closed housing 71B is formed directly in the polymer body 64B of the lower end connector 60B and / or a closed housing, not shown, is formed directly in the polymer body 64A of the upper end connector 60A. The closed housing of body 64A and the closed housing 71B of body 64B The upper body 62A and the lower body 62B are respectively received for connection with the upper end connector 60A and the lower end connector 60B. A tube 61B, shown in dashed lines in [Fig. 9], is adapted to be moved longitudinally around the closed housing 71B of the body 64B for connection between the lower body 62B and the lower end connector 60B. A tube 61A, similar to the tube 61A of the first embodiment, is adapted to be moved longitudinally around the closed housing of the body 64A for connection between the upper body 62A and the upper end connector 60A.

[0102] In all embodiments, the first monofilament yarn, and respectively the second monofilament yarn, consists of a single solid round filament whose diameter corresponds to the yarn diameter along its entire length. A nylon monofilament yarn is obtained directly by extruding the polymer through a hole whose diameter corresponds to the yarn diameter. A metallic monofilament yarn is obtained directly by drawing wire to obtain a diameter corresponding to the yarn diameter. A monofilament yarn within the meaning of the invention excludes any yarn obtained by braiding or twisting several filaments and is not intended to be braided or twisted with another yarn. In particular, a metallic monofilament yarn excludes any braided cable.

[0103] Any feature described above for one embodiment or variant is applicable to the other embodiments and variants described above, insofar as this is technically possible.

Claims

Demands

1. Jacquard heddle (6) for guiding a warp thread (4) on a Jacquard loom (1), the Jacquard heddle (6) extending along a longitudinal axis (Zl) and comprising: • a link (8), comprising a convex outer edge (84) and two flat principal faces (80,82), parallel and opposite to each other, the link (8) being crossed, from one of the principal faces (80,82) to the other, by an eyelet (81) for the passage of the warp thread (4), by an upper hole (83) and by a lower hole (85), the upper hole (83) and the lower hole (85) being arranged on either side of the eyelet (81) along the longitudinal axis (Zl); • a first wire (65A), entering the upper hole (83) and forming an upper loop (67A); and • a second wire (65B), which is distinct from the first wire (65A) and which enters the lower hole (85) by forming a lower loop (67B); characterized in that: • the Jacquard webbing (6) includes an upper end connector (60A), comprising means for connecting to a first element of a Jacquard harness (3), two end portions (69A) of the first wire (65A) being connected to the upper end connector (60A); and • the Jacquard rail (6) includes a lower end connector (60B), including means for connecting to a second element of the Jacquard harness (3), two end portions (69B) of the second wire (65B) being connected to the lower end connector (60B); • the upper loop (67A) delimits a free opening (671 A) extending, along the longitudinal axis (Zl), from the upper hole (83) to the connection of the two end portions (69A) of the first wire (65A) with the upper end connector (60A); • The lower loop (67B) defines a free opening (67 IB) extending, along the longitudinal axis (Zl), from the lower hole (85) to the connection of the two end portions (69B) of the second wire (65B) with the lower end connector (60B); • The first wire (65A) is the only link between the link (8) and the upper end connector (60A) and is a monofilament wire of constant diameter (d62A); • The second wire (65B) is the only link between the link (8) and the lower end connector (60B) and is a monofilament wire of constant diameter (d62B); • The upper hole (83) is circular in cross-section; and • The lower hole (85) is circular in cross-section.

2. Jacquard smooth (6) according to claim 1, wherein: • a diameter (d83) of the upper hole (83) is greater than or equal to twice, preferably 2.5 times, the diameter (d62A) of the first wire (65A) and is preferably less than 3.5 times, the diameter (d62A) of the first wire (65A); and • a diameter (d85) of the lower hole (85) is greater than or equal to twice, preferably 2.5 times, the diameter (d62B) of the second wire (65B), and is preferably less than 3.5 times, the diameter (d62B) of the second wire (65B).

3. Jacquard smooth (6) according to any one of claims 1 or 2, wherein the thickness (e8) of the link (8), measured from one of the principal faces (80,82) to the other, perpendicular to the longitudinal axis (Zl), is less than twice the smallest diameter between the diameter (d62A) of the first yarn (65A) and the diameter (d62B) of the second yarn (65B).

4. Jacquard smooth (6) according to any one of claims 1 to 3, wherein the outer edge (84) of the link (8) comprises two central portions (86A, 86B) extending along the longitudinal axis (Z1) and an upper portion (88A), respectively a lower portion (88B), terminating with an upper rounded end (87A), respectively a rounded end lower (87B), and in which the upper portion (88A), respectively the lower portion (88B), corresponds to a progressive reduction in width of the main faces (80, 82) from the central portions (86A,86B) towards respectively the upper rounding (87A), the lower rounding (87B), the width being taken along a direction perpendicular to the longitudinal axis (Zl) and parallel to the main faces (80, 82).

5. Jacquard smooth (6) according to claim 4, wherein: • the upper rounding (87A) is centered on the upper hole (83) and extends at least 100° around the center of the upper hole (83); and • the lower rounding (87B) is centered on the lower hole (85) and extends at least 100° around the center of the lower hole (85).

6. Jacquard smooth (6) according to any one of claims 1 to 5, wherein a height (h81) of the eyelet (81), measured parallel to the longitudinal axis (Zl), is at least five times greater than the largest diameter between a diameter (d83) of the upper hole (83) and a diameter (d85) of the lower hole (85).

7. Jacquard smooth (6) according to any one of claims 1 to 6, wherein the link (8) is metallic, preferably stainless steel.

8. Jacquard smooth (6) according to any one of claims 1 to 7, wherein the eyelet (81) comprises an upper edge (811) and a lower edge (812), delimiting the eyelet (81) along the longitudinal axis (Zl), the upper edge (811) and the lower edge (812) being perpendicular to the longitudinal axis (Zl) and wherein a width (181) of the eyelet (81) is strictly greater than the larger diameter between the diameter (d83) of the upper hole (83) and the diameter (d85) of the lower hole (85), preferably 2.5 to 3.5 times greater.

9. Smooth Jacquard (6) according to any one of claims 1 to 8, wherein the first yarn (65A) and the second yarn (65B) are made of nylon.

10. Smooth Jacquard (6) according to any one of claims 1 to 8, wherein the first yarn (65A) and the second yarn (65B) are metallic.

11. Smooth Jacquard (6) according to claim 10, wherein: • the upper end connector (60A) is made of polymer material, overmolded on the two end portions (69A) of the first wire (65A); and • the lower end connector (60B), is made of polymer material, overmolded on the two end portions (69B) of the second wire (65B).

12. Smooth Jacquard (6) according to any one of claims 1 to 10, wherein: • the upper end connector (60A) includes a housing (68A) passing through in a direction perpendicular to the longitudinal axis (Zl) for the partial reception of the two end portions (69A) of the first wire (65A) which are linked to it; and • the lower end connector (60B) includes a housing (68B) passing through in a direction perpendicular to the longitudinal axis (Zl) for the partial reception of the two end portions (69B) of the second wire (65B) which are linked to it.

13. Smooth Jacquard (6) according to claim 12, wherein: • the connection between the two end portions (69A) of the first wire (65A) and the upper end connector (60A) comprises a tube (61A), disposed around the housing (68A) and pressing the two end portions (69A) of the first wire (65A) into contact with the upper end connector (60A); and • the connection between the two end portions (69B) of the second wire (65B) and the lower end connector (60B) comprises a tube (61B), disposed around the housing (68B) and pressing the two end portions (69B) of the second wire (65B) into contact with the lower end connector (60B).

14. Smooth Jacquard (6) according to any one of claims 1 to 13, wherein: • the connection between the two end portions (69A) of the first wire (65A) and the upper end connector (60A) includes an external sheath (70A) disposed partially around the upper end connector (60A) and the first wire (65A); and the connection between the two end portions (69B) of the second wire (65B) and the lower end connector (60B) includes an external sheath (70B) disposed partially around the lower end connector (60B) and the second wire (65B).

15. Jacquard loom (1) comprising several Jacquard heddles (6), characterized in that at least one of the Jacquard heddles (6) is according to any one of claims 1 to 14.

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