Jacquard heddle and loom comprising such a Jacquard heddle

Abstract

Jacquard heddle and loom comprising such a Jacquard heddle Jacquard heddle (6) comprising a link (8), comprising an upper hole (83) and a lower hole (85) of circular section. A first monofilament yarn (65A) engages in the upper hole forming an upper loop (67A) and a second monofilament yarn (65B) engages in 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 connected and a lower end connector (60B) to which two end portions (69B) of the second yarn (65B) are connected. The upper loop (67A) defines a free opening (671A) extending from the upper hole to the connection of the two end portions of the first wire with 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 abstract: 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 density of warp threads and limit the snagging of neighboring warp threads. During weaving on a Jacquard loom, especially when the warp threads are thick, the heddle links can be drawn in the direction of advance of the warp threads, which results in bending of the heddles out of the longitudinal plane, or the contact between the heddle link and the neighboring warp threads 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 subject to bending in the direction of advance of the warp threads.

[0003] JPS55139185 describes a heddle for a loom frame, which is therefore not a Jacquard loom. The heddle is formed of a link, an upper thread, and a lower thread. The upper thread is inserted into a triangular recess at the top of the link, and the lower thread is inserted into a triangular recess at the bottom of the link. To attach it to the triangular recess, each thread is wound around itself, forming a twist.

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

[0005] These known heddles would be poorly suited to a Jacquard loom, particularly in cases where the warp threads are thick and apply a significant bending force to the heddle link in the direction of travel. Indeed, these known heddles do not withstand the stresses imposed by the Jacquard loom well, in that, when the heddles are deformed by bending outside the longitudinal plane, the twists forming the connections between the heddle bodies and the link are subjected to significant stress. This can cause the beginnings of breakage and premature wear of the heddles, particularly the twists. Furthermore, these known heddles are not protected from corrosive environments, which tends to promote said beginnings of breakage.

[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 external edge and two flat main faces, parallel and opposite to each other, the link being crossed, from one of the main faces to the other, by an eyelet for passing 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, engaging in the upper hole forming an upper loop; And

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

[0011] According to the invention:

[0012] - the Jacquard smooth comprises an upper end connector, comprising means for connecting to a first element of a Jacquard harness, two end portions of the first yarn being connected to the upper end connector; and

[0013] - the Jacquard smooth comprises a lower end connector, comprising means for 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 horizontal, 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 horizontal, 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 connection between the link and the upper end connector and is a monofilament yarn of constant diameter;

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

[0018] - the upper hole is of circular section; and

[0019] - the lower hole is of circular section.

[0020] Thanks to the invention, when the heddle is bent while 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 allowed, by pivoting 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 allowed, by pivoting the lower hole in the free opening of the loop of the lower body. This pivoting of the link inside the loops is favored by the cooperation of the circular wire forming the body with the circular hole of the link in which it is engaged and allows the heddle to deform without generating bending stress at the connection between the link and the upper body, respectively the lower body. The risk of breakage of the rail is thus reduced.

[0021] According to other advantageous aspects of the invention, the Jacquard heddle comprises one or more of the following characteristics, 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 main faces to the other, perpendicular broadly 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 along 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 main 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 main faces.

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

[0027] - the lower rounding, 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 an upper hole diameter and a lower hole diameter.

[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 largest 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 thread and the second thread 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 on the two end portions of the first wire.

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

[0035] - the upper end connector comprises 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 linked to it.

[0036] - the lower end connector, comprises 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 linked to it.

[0037] - the connection between the two end portions of the first wire and the connector upper end connector comprises a tube, disposed 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 lower end connector comprises a tube, disposed 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 connector 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 lower end connector includes an outer sheath disposed 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 the Jacquard heddles of which conforms to the above.

[0042] The invention will appear more clearly on reading the description which follows, given solely by way of non-limiting example, and made with reference to the drawings in which:

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

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

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

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

[0047] [Fig.5] [Fig.5] is a partial longitudinal section of the rail of the figures pre preceding along the cutting line VV shown in [Fig.4], the stringer 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 of the previous figures, showing a hook of the connector lower end, before the lower end connector is bonded to the lower body.

[0049] [Fig.7] [Fig.7] is a perspective view of a step in the manufacture of the rail of the preceding figures.

[0050] [Fig.8] [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] [Fig.9] is a front view of a lower end connector belonging to a Jacquard heddle according to a third embodiment of the invention.

[0052] A Jacquard loom 1, according to a first embodiment of the invention, shown schematically in [Fig.l], comprises a Jacquard type shed forming mechanism 2, a harness 3 within which Jacquard heddles 6 are integrated, a loom frame 7 and warp threads 4. The shed 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 shed forming mechanism 2. In the configuration mounted in the harness 3, and excluding any possible deformation during weaving, each Jacquard heddle 6 is stretched 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 itself being connected to the loom frame 7. Each Jacquard heddle 6 comprises a respective link 8 crossed by a warp thread 4.With each stroke of the Jacquard loom 1, the shed-forming 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 threads 4, carried by the Jacquard heddles 6, into different predetermined positions along the longitudinal axis Zl, to form a fabric with the warp threads 4 and a weft thread 9 inserted through the shed formed by the warp threads 4 thanks to the positioning of the Jacquard heddles 6. With each stroke of the Jacquard loom 1, the warp threads 4 advance along a direction of advance XI, perpendicular to the axis ZL.

[0054] The Jacquard rail 6 is visible in more detail in [Fig.2]. The Jacquard rail 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 only link between the link 8 and the upper end connector 60A. The upper end connector 60A is distinct from the upper body 62A. The upper body 62A is exclusively formed from a single first thread 65A, preferably made of nylon, for example polyamide 6 or polyamide 6.6 with or without additive, monofilament, without twist or undulation, and advantageously of constant circular section, ideally with a diameter d62A of 0.4mm (millimeters). The upper body 62A is continuous and two end portions 69A of the upper body 62A are linked to the upper end connector 60A. The upper body 62A forms an upper loop 67A, visible in Figures 2, 4 and in particular 5, which delimits a free opening 671A which extends longitudinally from the connection of the two end portions 69A of the upper body 62A with the upper end connector 60A, precisely 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 linked together at the level of the connection of the upper body 62A with the upper end connector 60A and are not immobilized on the link 8. In a configuration of the Jacquard heddle 6 not mounted in the harness 3, the upper body 62A can therefore slide in 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 twisted. 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 only link between the link 8 and the lower end connector 60B. The lower end connector 60B is distinct from the lower body 62B. The lower body 62B is exclusively formed of a second yarn 65B, preferably made of nylon, for example polyamide 6 or polyamide 6.6 with or without additive, monofilament, without twisting or undulation, and advantageously of constant circular section, ideally with a diameter d62B of 0.4 mm. The second yarn 65B forming the lower body 62B is distinct 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 linked to the lower end connector 60B.The lower body 62B forms a lower loop 67B, visible in Figures 2, 4 and in particular 5, which delimits a free opening 671B which extends longitudinally from the connection of the two end portions 69B of the lower body 62B with the lower end connector 60B, precisely 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 connected together at the connection of the lower body 62B with the lower end connector 60B and are not immobilized on 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 no . other connection between link 8 and lower end connector 60B than second wire 65B.

[0057] The Jacquard rail 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 in particular in [Fig. 3], detail B, comprises a body 64B, preferably made of polymer, elongated along the longitudinal axis Zl, a hook 66B, preferably made of metal, visible in [Fig. 6], a tube 61B and an external sheath 70B, preferably a heat-shrunk sheath. The body 64B, preferably a screw thread belonging to the body 64B, forms a fastener 63B, by means of 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 ZL

[0058] As seen in [Fig.6], the hook 66B delimits a housing 68B, passing through in a direction perpendicular to the longitudinal axis ZL. The housing 68B is open along the longitudinal axis Zl towards 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 around the longitudinal axis ZL. As shown in [Fig. 7], the tube 61B advantageously forms an internal funnel 61 1B, and an external collar 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 without discontinuity all around the longitudinal axis ZL.

[0060] The Jacquard rail 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 Zl, a hook 66A, preferably made of metal, a tube 61A and an external sheath 70A, preferably a heat-shrunk sheath. The body 64A forms a fastener 63A by means of 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 ZL

[0061] The hook 66A delimits a housing 68A passing through in a perpendicular direction dicular to the longitudinal axis Zl. The housing 68A is open along the longitudinal axis ZI 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 611 A, visible in FIG. 3A, and an external collar 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 flat and each extend 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 direction of advance XL. The link 8 is single-thickness, with 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 limits the size of the upper 67A and lower 67B loops perpendicular to the main faces and therefore limits the impact of the Jacquard heddle on the density of the warp threads.

[0064] The link 8 comprises an outer edge 84, which delimits the link 8 over its entire periphery. The outer edge 84 surrounds the main faces 80 and 82 over their entire periphery, and connects the main faces 80 and 82 together. The outer edge 84 is closed and convex of hexagonal shape. Preferably, the outer edge 84 comprises two central portions 86A and 86B, opposite, parallel and 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 ends with an upper rounding 87A. The upper portion The upper portion 88A corresponds to a progressive reduction in the width of the main faces 80, 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 rounding 87A along the longitudinal axis Zl. The lower portion 88B ends with a lower rounding 87B. The lower portion 88B corresponds to a progressive reduction in the width of the main faces 80, 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 rounding 87B along the longitudinal axis ZL

[0066] The link 8 delimits an eyelet 81, inside the external edge 84, passing through the link 8 from one side to the other, from the main face 80 to the main face 82, i.e. perpendicular 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 size of link 8 in a plane parallel to the longitudinal plane therefore remains slightly impacted by the arrangement of the upper 83 and lower 85 holes.

[0068] Inside the outer edge 84, the link 8 also delimits 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 2.5 times the diameter d62A of the upper body 62A and is preferably less than 3.5 times 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 in the direction of advance XI and / or in the longitudinal plane during weaving. Thus, the stress on the Jacquard heddle 6 in bending does not cause a risk of breakage at the connection between the link 8 and the upper body 62A.

[0071] The upper rounding 87A is centered on the upper hole 83 and extends over at least 100°, preferably over 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 rounding 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 make it possible to ensure that the lower body 62B can pivot in the lower hole 85 when the link 8 is pushed by the warp threads 4 in the direction of advance XI and / or perpendicular to the direction of advance 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 rounding 87B is centered on the lower hole 85 and extends over at least 100°, preferably over 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 rounding 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 thread 4, in particular when it is multi-filament and flat, cooperates optimally with the eyelet 81 which it passes through, in particular with the lower edge 812 and the upper edge 811. In particular, the warp thread 4 cooperates with the minimum deformation of the section of the warp thread 4.

[0075] As the free opening 67IB of the lower loop 67B of the lower body 62B around the link 8 is maximum and / or as 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 take different inclinations, some of which are visible in [Fig.5], to adapt to the forces exerted by the neighboring warp threads 4 on the smooth Jacquard 6 and to the warp thread 4 guided by the smooth Jacquard 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 favored and jamming is avoided.

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

[0078] Furthermore, the lower loop 67B is not constrained by the thickness e8 of the link 8 during deformation outside 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 mono-filament 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, the contact of the lower body 62B does not create any snagging of a neighboring multi-filament warp yarn 4. In addition, since the lower rounding 87B extends widely around the lower hole 85, in the case of orientation of the lower body 62B relative to the link 8 in the longitudinal plane, the sliding of the neighboring warp yarns 4 from the Jacquard heddle 6 of the link 8 towards the lower body 62B and from the lower body 62B towards the link 8 is favored.

[0080] As the free opening 671A of the upper loop 67A of the upper body 62A around the link 8 is maximum 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 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 constraints 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 favored and jamming is avoided.

[0082] Furthermore, due to the upper body mono-filament structure 62A and therefore its constant section over its entire length, the orientation of the link 8, in particular of the main faces 80 and 82, relative 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 outside 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 mono-filament structure of the yarn forming the upper body 62A and constituting the only link between the link 8 and the upper end connector 60A, the contact of the upper body 62A does not create any snagging of a neighboring multi-filament warp yarn 4. In addition, since the upper rounding 87A extends widely around the upper hole 83, in the event of orientation of the upper body 62A relative to the link in the longitudinal plane, the sliding of the neighboring warp yarns 4 from the Jacquard heddle 6 of the link 8 towards the upper body 62A and from the upper body 62A towards the link 8 is favored.

[0085] The sheath 70B and the tube 61B are part of the connection between the lower body 62B and the lower end connector 60B. The sheath 70B, forming the external part of this connection, contributes to making this connection as smooth as possible, without snagging for 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 in the direction of the link 8, limits the free opening 671B along the longitudinal axis ZI in the direction of the lower end connector 60B.

[0086] The sheath 70A and the tube 61A are part of the connection between the upper body 62A and the upper end connector 60A. The sheath 70A, forming the external part of this connection, contributes to making this connection as smooth as possible, without snagging for 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 in the direction of the link 8, limits the free opening 671A along the longitudinal axis ZI in the direction of the upper end connector 60A.

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

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

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

[0091] After overmolding and folding the hook 66B, the tube 61B is placed between the attachment 63B and the housing 68B with the 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] When manufacturing 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 visible in [Fig.7], the end portions 69B of the lower body 62B are engaged, preferably in the same direction, in the through direction of the housing 68B, through 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 back towards the link 8 from the housing 68B. The tube 61B is then moved with a longitudinal movement along the longitudinal axis Z1 towards the link 8 around the housing 68B and partially around the two end portions 69B. The funnel promotes this insertion movement around the housing 68B. The external collar 612B promotes the support of the tube 61B for 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 crushing 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 wedging 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 and a heat-shrinkable sheath, 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 then heated to come to surround without play the tube 61B and the lower end connector 60B by heat shrinking. The connection of the lower body 62B with the lower end connector 60B therefore comprises a blocking of the end portions 69B relative 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 the hook 66A, the tube 61A is placed between the attachment 63A and the housing 68A with the 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] When manufacturing 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 in the through direction of 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 back towards the link 8 from the housing 68A. The tube 61A is then moved with a longitudinal movement along the longitudinal axis Z1 towards the link 8 around the housing 68A and partially around the two end portions 69A. The funnel promotes this insertion movement around the housing 68A. The external collar 612A promotes the support of the tube 61A for its longitudinal movement. The internal surface of the tube 61A presses the end portions 69A of the upper body 62A against the hook 66A.The tube 61A is then plastically deformed around the housing 68A, preferably with crushing in the direction perpendicular to the through direction of the housing 68A before crushing the tube 61A, tightening the hook 66A around the end portions 69A of the upper body 62A to accentuate the wedging of the end portions 69A of the upper body 62A in the housing 68A. The free ends of the upper body 62A, not shown, protruding from the tube 61A are cut and a heat-shrinkable sheath intended to form the sheath 70A, is placed around the tube 61A, the hook 66A, and partially around the body 64A and the first wire 65A then heated to come to surround without play the 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 comprises a blocking of the end portions 69A relative to the upper end connector 60A by means of the tube 61A.After this connection, the body 64A extends beyond the end portions 69A. along the longitudinal axis ZI in a direction opposite to the link 8. Preferably, the housing 68A passes through along the transverse axis Y1 and the maximum lateral dimension is arranged perpendicular to the transverse axis Yl.

[0099] [Fig.8] illustrates a second embodiment of the Jacquard heddle 6, identical to the first embodiment except for the characteristics described below. The second wire 65B of the lower body 62B is a round monofilament wire of constant section over its entire length, without twisting or undulation, 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 heddle 6 of the correct length, the end portions 69B of the lower body 62B are shaped, advantageously with a wavelet shape, and overmolded in the body 64B of the lower end connector 60B. The first wire 65A of the upper body 62A is a round monofilament wire of constant section over its entire length, without twisting or undulation, in stainless steel, with a diameter d62A less than 0.5 times the diameter d83 of the upper hole 83 in which the upper body 62A is engaged. After placing the upper body 62A in the upper hole 83 of the link 8 to form the Jacquard rail 6 of the correct length, the end portions 69A of the upper body 62A are shaped, advantageously with a wavelet shape, and overmolded in the body 64A of the upper end connector 60A. The shaping of each end portion 69B, 69A can also be carried out before the lower body 62B is placed in the lower hole 85 and the upper body 62A in the upper hole 83. After overmolding, a sheath of the heat-shrunk sheath 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 a variant not shown, the two end portions of one of the upper body 62A and the lower body 62B are shaped and overmolded in 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 by means of a tube, as in the first embodiment.

[0101] [Fig.9] illustrates a third embodiment of the Jacquard stringer 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 the body 64A and the closed housing 71B of the body 64B respectively receive the upper body 62A, the lower body 62B for their connection with respectively the upper end connector 60A, the lower end connector 60B. A tube 61B, shown in dotted lines in [Fig.9], is able to be moved longitudinally around the closed housing 71B of the body 64B for the connection between the lower body 62B, and the lower end connector 60B. A tube 61 A, similar to the tube 61A of the first embodiment, is able to be moved longitudinally around the closed housing of the body 64A for the connection between the upper body 62A, and the upper end connector 60A.

[0102] In all embodiments, the first monofilament yarn, respectively the second monofilament yarn, consists of a single solid round filament whose diameter corresponds to the diameter of the yarn over its entire length. A nylon monofilament yarn is obtained directly from the extrusion of the polymer through a hole whose diameter corresponds to the diameter of the yarn. A metal monofilament yarn is obtained directly from wire drawing to obtain a diameter corresponding to the diameter of the yarn. 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 metal 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, as far as this is technically possible.

Claims

Claims

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 external edge (84) and two main faces (80, 82) which are flat, parallel and opposite to each other, the link (8) being crossed, from one of the main faces (80, 82) to the other, by an eyelet (81) for passing 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), engaging in the upper hole (83) forming an upper loop (67A); and • a second wire (65B), which is distinct from the first wire (65A) and which engages in the lower hole (85) forming a lower loop (67B); characterized in that: • the Jacquard stringer (6) comprises an upper end connector (60A), comprising means for connection to a first element of a Jacquard harness (3), two end portions (69A) of the first yarn (65A) being linked to the upper end connector (60A); and • the Jacquard stringer (6) comprises a lower end connector (60B), comprising means for connection to a second element of the Jacquard harness (3), two end portions (69B) of the second yarn (65B) being linked 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) delimits 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 connection 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 connection between the link (8) and the lower end connector (60B) and is a monofilament wire of constant diameter (d62B); • the upper hole (83) is of circular section; and • the lower hole (85) is of circular section.

2. Jacquard heddle (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 yarn (65A) and is preferably less than 3.5 times, the diameter (d62A) of the first yarn (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 yarn (65B), and is preferably less than 3.5 times, the diameter (d62B) of the second yarn (65B).

3. Jacquard heddle (6) according to any one of claims 1 or 2, in which the thickness (e8) of the link (8), measured from one of the main 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 wire (65A) and the diameter (d62B) of the second wire (65B).

4. Jacquard smooth (6) according to any one of claims 1 to 3, in which the external edge (84) of the link (8) comprises two central portions (86A, 86B) which extend along the longitudinal axis (Zl) and an upper portion (88A), respectively a lower portion (88B), ending with an upper rounding (87A), respectively a lower rounding 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 in a direction perpendicular to the longitudinal axis (Zl) and parallel to the main faces (80, 82).

5. Jacquard smooth (6) according to claim 4, in which: • 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 heddle (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 rail (6) according to any one of claims 1 to 6, in which 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 largest 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. Jacquard weave (6) according to any one of claims 1 to 8, wherein the first yarn (65A) and the second yarn (65B) are nylon.

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

11. Jacquard smooth (6) according to claim 10, in which: • 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. Jacquard smooth (6) according to any one of claims 1 to 10, in which: • the upper end connector (60A) comprises 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 yarn (65A) which are connected to it; and • the lower end connector (60B), comprises 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 yarn (65B) which are connected to it.

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

14. Jacquard smooth (6) according to any one of claims 1 to 13, in which: • the connection between the two end portions (69A) of the first thread (65A) and the upper end connector (60A) comprises an outer 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) comprises an outer 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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