EP3276058B1 - Litze für jacquard-webrahmen, ihr herstellungsverfahren und webrahmen, der eine solche litze umfasst - Google Patents

Litze für jacquard-webrahmen, ihr herstellungsverfahren und webrahmen, der eine solche litze umfasst Download PDF

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Publication number
EP3276058B1
EP3276058B1 EP17182946.8A EP17182946A EP3276058B1 EP 3276058 B1 EP3276058 B1 EP 3276058B1 EP 17182946 A EP17182946 A EP 17182946A EP 3276058 B1 EP3276058 B1 EP 3276058B1
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EP
European Patent Office
Prior art keywords
link
eyelet
heddle
branch
strand
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Application number
EP17182946.8A
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English (en)
French (fr)
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EP3276058A1 (de
Inventor
Michael Himmelstoss
Michel Herrmann
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Staeubli Lyon SA
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Staeubli Lyon SA
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Publication of EP3276058A1 publication Critical patent/EP3276058A1/de
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C9/00—Healds; Heald frames
    • D03C9/02—Healds
    • D03C9/024—Eyelets
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C9/00—Healds; Heald frames
    • D03C9/02—Healds
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types
    • D03C3/30—Arrangements wherein hooks are positively operated to close shed
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types
    • D03C3/38—Comber boards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C9/00—Healds; Heald frames
    • D03C9/02—Healds
    • D03C9/026—Material used
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C9/00—Healds; Heald frames
    • D03C9/06—Heald frames
    • D03C9/0608—Construction of frame parts
    • D03C9/0658—Intermediate supports or their connection to other frame parts
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types
    • D03C3/26—General arrangements of jacquards, or disposition in relation to loom
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types
    • D03C3/32—Jacquard driving mechanisms

Definitions

  • the invention relates to a heddle for a Jacquard-type loom harness.
  • a beam is conventionally equipped with an eyelet for guiding a warp wire, the material and the shape of this eyelet being chosen so as not to injure the warp wire passing through this eyelet and not to wear out under the friction of the string. warp thread advance.
  • EP-A-1 767 676 teaches inserting a carbon steel eyelet into an opening formed by a longitudinal stainless steel body.
  • this longitudinal body which defines a link within which the eyelet is placed, interactions occur with the yarn passing through the eyelet as well as with the neighboring warp yarns passing through the eyelets of the neighboring heddles.
  • This imposes a rigorously controlled surface finish for the eyelet and the longitudinal body, as well as a very precise assembly.
  • the cost price of the beam is increased.
  • eyelet corrosion phenomena can be observed when the warp threads are moistened to reduce friction during weaving with high density. Corrosion alters the surface condition of the eyelet which becomes aggressive for the warp threads.
  • a Jacquard loom harness healer according to the preamble of claim 1 is known from EP-A-3 009 545 .
  • the invention more particularly intends to remedy by proposing a new heddle for Jacquard looms which can be manufactured quickly and economically and in which the risks of damaging the warp yarn passing through the heddle and neighboring warp yarns are significantly reduced compared to the state of the art.
  • the invention relates to a heddle for a Jacquard loom harness, this heddle comprising two strands, each equipped at a first end with a member for fastening the heddle to an element of the harness, as well as a link with an eyelet for guiding a warp wire, the eyelet being arranged along a longitudinal axis of the beam, between the strands.
  • the link is made of synthetic material and comprises two branches arranged on either side of the eyelet along the longitudinal axis of the stringer and part of each branch is molded onto a second end of a strand opposite to its first end and offset longitudinally from the eyelet.
  • each branch of the link completely surrounds the second end of the corresponding strand and the second end of each strand is shaped with a geometry intended to provide an anchoring opposing the displacement of the overmolded part of the branch relative to the second end of the corresponding strand in two opposite longitudinal directions, while the eyelet is delimited by the synthetic material which constitutes the link.
  • the link overmolded on the second ends of the two strands and made of synthetic material defines the contact surfaces with a warp yarn passing through the heddle as well as with the neighboring warp yarns.
  • the geometry of the second ends of the strands ensures effective immobilization, by anchoring, of the link on the strands.
  • These chain threads are only in contact with the synthetic material of the link, at the level of the eyelet and in the vicinity of the branches of the link in a vertical direction, which ensures non-aggressive contact with the chain threads, in the absence corrosion since the link is not metallic.
  • the synthetic material constituting the link can be chosen according to the material of the warp threads, in order to ensure good compatibility between the link and the warp threads, as well as low friction.
  • the invention relates to a loom including a shed forming mechanism which comprises, inter alia, a Jacquard machine, a harness and a set of heddles According to the invention, at least one of these heddles is as mentioned above.
  • this loom is configured to weave a fabric with a thickness greater than 5 mm and each branch of the link of the stringer has a length, measured parallel to its longitudinal axis, which is strictly greater than the thickness of the fabric. .
  • This loom makes it possible to guarantee that, in an open shed, the parts of a heddle in contact with the warp threads passing through the heddles in the same shed opening position are formed by its link which is made of synthetic material and which does not no risk of injuring or cutting neighboring wires.
  • the heddle can be manufactured by overmolding the shaped ends of the strands, which guarantees effective anchoring of the strands in the link, in two opposite longitudinal directions.
  • the synthetic material is injected through two injection points located at the level of a front face of the link, these injection points preferably being each located at a separate branch of the link.
  • This distribution of the injection points facilitates the distribution of the synthetic material within the injection mold, in particular around the non-rectilinear end sections of the strands.
  • the loom 2 shown in figure 1 is configured to weave a fabric T whose thickness eT is greater than 5 mm, for example of the order of 10 mm.
  • the loom 2 comprises a beam 4 from which the warp threads 6 are unwound, as well as a canvas roller 8 intended to receive the fabric T.
  • a system, not shown and known per se, for inserting weft threads allows weft threads to pass through a shed F defined between the warp threads 6.
  • Each warp thread passes through an eyelet of a heddle 10, the vertical position of which is controlled by a shed forming mechanism 12 which comprises a Jacquard mechanism 14 and a harness 16 formed by arches 18 which pass through a guide board. 20, a tipping board 22 and return springs 26.
  • Each stringer 10 is suspended from an arch 18 and connected, in the lower part, to a fixed frame 24 of the loom 2 by means of a return spring 26 which tends pulling this beam downwards, against a lifting action exerted by the corresponding arch 18.
  • the loom 2 also includes a comb 28 used to beat the weft thread, newly inserted in the shed F, against the fabric T.
  • Each stringer 10 comprises a link 30, an upper strand 32 disposed above the link in the configuration of the figure 1 and a lower strand 34 disposed below this link in this configuration.
  • Each strand 32 and 34 is formed by a metal wire, preferably of stainless steel, which has a length, measured parallel to a longitudinal axis X10 of the stringer, greater than or equal to 250 mm.
  • the metal wire constituting a strand 32 or 34 is made of stainless steel, with a circular section of diameter D3 equal to 0.4 mm. To the figure 3 , the strands 32 and 34 are shown interrupted, for clarity of the drawing.
  • a longitudinal direction of the rail 10 is defined as a direction parallel to the axis X10.
  • the link 30 defines a closed internal contour 36 which constitutes an eyelet for the passage of a warp wire 6.
  • Z10 denotes the central axis of the eyelet 36, that is to say an axis passing through the center of the opening which corresponds to this eyelet and constituting an axis of symmetry of the edges delimiting this eyelet 36.
  • L ' Z10 axis is a transverse axis for beam 10.
  • Y10 an axis perpendicular to the axes X10 and Z10.
  • the Y10 axis is a lateral axis for the beam 10.
  • the link 30 is of flattened shape with its median principal plane P30 parallel to the axes X10 and Y10 and equidistant from two end faces 30a and 30b of the link.
  • the strand 32 includes a first end 322 which is shaped by zigzag folding, with corrugations which extend laterally, with respect to the axis X10, that is to say with a non-zero component parallel to the axis. Y10 and perpendicular to the central axis Z10 of the eyelet 36, being deflected on either side of the axis X10. On this first end 322 is overmolded a tip 38 of synthetic material which defines an opening 40 for the passage of an arch 18 and for wedging this arch to the by means of a sheath not shown, in accordance with the technical teaching of EP-A-915 195 .
  • the second end 324 of the strand 32 which is opposite the first end 322, is also shaped by zigzag folding with corrugations which extend laterally with respect to the axis X10, i.e. with a component non-zero parallel to the Y10 axis, and perpendicular to the central axis Z10 of the eyelet 36. These undulations are also arranged on either side of the X10 axis.
  • the corrugations of the ends 322 and 324 extend in the same plane parallel to the axes X10 and Y10, which is favorable in terms of ease and speed of manufacture.
  • a first end 342 of the strand 34 is shaped by zigzag folding, while a second end 344 of this same strand, opposite the first end, is also shaped by zigzag folding, the corrugations of these two ends extending laterally. with respect to the axis X10, that is to say with a non-zero component parallel to the axis Y10, and perpendicular to the central axis Z10 of the eyelet 36. They extend in the same parallel plane to the X10 and Y10 axes.
  • the ends 322, 324, 342 and 344 each have at least one corrugation. They therefore form non-rectilinear end sections for the strands 32 and 34.
  • ends 322, 324, 342 and 344 are shown in thin lines, while they could be shown in dotted lines because they are embedded in the mass of link 30.
  • a tip 42 On the first end 342 is overmolded a tip 42 which comprises an external thread 422 on which can be screwed a spring 26, as well as strips 424 against which the spring rubs.
  • the cross section of the strand is kept in each case, with a diameter D3 of 0.4mm, which implies that the mechanical strength of one strand is not not diminished by this shaping of its second end, whereas this could be the case if material were removed.
  • the link 30, which extends between the strands 32 and 34 along the axis X10, is molded around the second ends 324 and 344 of these strands.
  • the second ends 324 and 344 are disposed at the longitudinal level of the link 30.
  • the link 30 forms two longitudinal branches 52 and 54 respectively overmolded on the second ends 324 and 344 of the strands 32 and 34.
  • the branches 52 and 54 are in one piece with the eyelet 36.
  • the second ends 324 and 344 are offset along the longitudinal axis X10 relative to the eyelet 36, so that each second end 324, 344 extends only into the respective branch 52, 54.
  • the link 30 is produced by overmolding, namely any molding process in which two or more materials are combined in the same cavity of the same mold in order to produce a part in a single block.
  • the overmolding can consist in injecting and hardening, in particular by cooling, a fluid material in a cavity of a mold in which is already positioned a part at least of another component, in the solid state, in the 'example, the ends 324 and 344 of the strands 32 and 34. The injected material then hardens in contact with the ends 324, 344 without play between the injected material and the ends 324, 344.
  • the synthetic material fills the undulations of the zigzags and the link 30 is then anchored on each of these ends while being immobilized in translation along the axis X10 in two opposite directions, i.e. in the direction of arrow F1 and in the direction of arrow F2 at the figure 3 , on the ends 324, 344.
  • the geometry of the ends 324 and 344 is intended to provide an anchoring with the synthetic material of the branches 52 and 54, which induces a firm and lasting immobilization of the link 30 on the strands 32 and 34.
  • This part 522 is the part of the branch 52 effectively molded onto the second end of the strand 32.
  • This part 522 is offset axially, along the axis X10, with respect to the eyelet 36.
  • 542 denotes the longitudinal part of the branch 54 within which extends the second end 344 of the strand 34, that is to say the part of this branch effectively molded around the end 344
  • This part 542 is also offset, axially along the axis X10, with respect to the eyelet 36.
  • the parts 522 and 542 of the branches 52 and 54 constitute portions of these branches opposite to the eyelet 36.
  • the link 30 is symmetrical with respect to a first plane defined by the axes X10 and Y10, with respect to a second plane defined by the axes X10 and Z10 and with respect to to a third plane defined by the Y10 and Z10 axes.
  • the maximum thickness of the branch 52 is denoted by e5, measured parallel to the axis Z10. This thickness e5 is measured at the level of the part 522. This thickness e5 is also the maximum thickness of the branch 54 measured at the level of the part 542. We also note e3 the minimum thickness of the eyelet 36 measured parallel to the Z10 axis, in the Y10 Z10 plane.
  • the thickness e5 is equal to approximately 1 mm, while the thickness e3 is equal to approximately 0.8 mm.
  • the link 30 is thinner at the level of the eyelet 36 than at the level of the parts 522 and 542 for anchoring the strands 32 and 34.
  • This shape of the link 30 facilitates the passage of a wire. chain inside the eyelet 36, as well as the passage of neighboring warp threads around this link, due to the relatively small thickness e3 of the eyelet, while ensuring sufficient mechanical resistance of the link at the level of the strand anchoring areas.
  • the e5 / e3 ratio is 1.25. In practice, satisfactory operation of the beam 10 is observed when this ratio is greater than or equal to 1.2, it being specified that it is preferably less than or equal to 1.4.
  • the ridges which define the link 30 are rounded over the entire outer periphery of this link, except at the level of the ends of the branches 52 and 54 opposite the eyelet 36. These ridges are also rounded over the entire inner periphery of the link 30 which defines eyelet 36.
  • the end of the branch 52 opposite the eyelet 36 is frustoconical with an opening angle ⁇ with respect to the axis X10, the value of which is preferably between 125 ° and 150 °. of the order of 140 °.
  • the angle ⁇ is defined between the axis X10, in a portion of the strand 32 which is not covered by the branch 52, and a tangent to the outer surface of the end 524.
  • end 544 of the branch 54 opposite the eyelet 36 is frustoconical and defines the same angle ⁇ .
  • L30 denotes the axial length of link 30, measured parallel to axis X10. This length L30 is, in practice, between 25 and 30 mm, preferably of the order of 28 mm.
  • the eyelet 36 in which the warp thread passes and which is centered on the axis Z10 is defined between two arms 362 and 364 of the link 30 which each extend between the branches 52 and 54, on either side of the X10 Z10 plane.
  • the section of each arm 362 or 364, taken according to the plane Y10 Z10 is square with rounded corners.
  • the width l360 of an arm 362 or 634 measured parallel to the Y10 axis is equal to its thickness e36 measured parallel to the Z10 axis.
  • the value of the thickness e36 visible in this figure is the minimum thickness of the link at the level of the eyelet, therefore equal to the thickness e3.
  • the arms 362 and 364 are in one piece with the branches 52 and 54, that is to say formed by the same overmolded synthetic material.
  • l3 the maximum external width of the link 30 in the longitudinal zone of the eyelet 36, this width being measured parallel to the axis Y10. This width l3 is also the maximum width of link 30 and is worth 5 mm in the example.
  • l5 the width of a branch 52 or 54 also measured parallel to the Y10 axis. l5 is variable along the longitudinal axis X1. Over the entire length of the branch 52 and over the entire length of the branch 54, except at the level of the ends 524 and 544, the ratio l5 on e5 is strictly greater than 1. In other words, except at the level of the ends 524 and 544, each branch 52 or 54 is wider than it is thick.
  • the section of a branch 52, 54 is flattened, except in the vicinity of the ends 524, 544.
  • the ratio of the maximum width l5 of the branch 52, 54 on l3 is strictly less than 1.
  • the branches 52 and 54 are narrower than the link in the area of the eyelet 36 in the lateral direction.
  • the ratio l5 / l3 is preferably less than 0.5.
  • the branches 52 and 54 are at least half as wide as the link 30 in the area of the eyelet 36.
  • each branch 52 or 54 has a constant and maximum thickness e5 over a zone Z5 which comprises the anchoring part 522 or 542. Going from the zone Z5 towards the eyelet 36, the thickness of the branch 52, 54 decreases gradually, while the width l5 gradually increases.
  • the width l5 is strictly greater than the overall width l4 of the zigzag end 324, 344. This allows the branch 52, 54 to be placed on either side. of the end 324, 344 in a direction parallel to the axis Y10. Moreover, as the thickness e5 is greater than the diameter D3, each branch 52, 54 is also disposed on either side of the end 324, 344 in a direction parallel to the axis Z10. All around the longitudinal axis X10, the extremity 324, 344 is therefore completely embedded in the synthetic material which constitutes the part 522, 542 of the branch 52, 54.
  • the branch 52, 54 therefore completely surrounds the end 324, 344, which guarantees effective mechanical anchoring of this end within this branch, not only in the two longitudinal directions of the arrows F1 and F2 but also in two opposite lateral directions represented by the arrows F3 and F4 and in two opposite transverse directions represented by the arrows F5 and F6.
  • the geometry of the eyelet 36 is generally oval with two rectilinear zones or flats 366 and 368 parallel to the axis Y10 and formed respectively at the foot of the branches 52 and 54, that is to say in the connection zone between these branches and the eyelet 36.
  • l6 the width of the zones 366 and 368 and l7 the maximum internal width of the eyelet 36.
  • L3 the internal length of the eyelet 36.
  • the width l6 is between 1.1 and 1.7 mm, preferably of the order of 1.4 mm
  • the width l7 is between 3.3 and 3.5 mm, preferably of the order of 3.4 mm
  • the length L3 is between 5.4 and 7 mm, preferably of the order of 6 mm.
  • the length of the branch 52 is denoted by L5, between the end 524 and the flat zone 366 disposed on the side of this branch, along the longitudinal axis X1.
  • the length L5 is also the length of the branch 54, between the end 524 and the flat zone 368, along the longitudinal axis X1.
  • the length L5 is greater than the thickness of the fabric eT, ie greater than 10 mm, preferably equal to 11 mm.
  • the L5 / L30 ratio is between 0.36 and 0.50, preferably of the order of 0.39.
  • L52 is also noted the length of the molded part 522 or 542 measured parallel to the axis X10. This length L52 is less than or equal to half of the length L5. In other words, the strand 32, respectively 34, extends inside the branch 52, respectively 54, over less than half the length of this branch. This makes it possible to give the panel 52 a rigidity in the part 522 where it is “reinforced” by the end 324 and an effective flexibility between this part 522 and the eyelet 36 where it is not “reinforced”. In practice, the length L52 is of the order of 5 mm and the L52 / L5 ratio is between 0.45 and 0.5, while the L52 / L30 ratio is between 0.17 and 0.25.
  • the strands 32 and 34 are each shaped with a zigzag section intended to constitute their second end 324 or 344.
  • a non-rectilinear section can be considered. Such a section is preferably carried out without removing material from the the strands 32 and 34, that is to say without reducing the area of their cross section, so as not to weaken these structural elements.
  • the two strands 32 and 34 are placed in a mold with their zigzag sections in place within the same cavity of this mold and facing each other, in the configuration shown in figure 3 .
  • the mold is closed and a suitable quantity of heated synthetic material is injected into the mold cavity at two remote injection points along the X10 axis, each injection point opening into the cavity of the mold.
  • mold at the level of a volume delimiting one of the branches 52 and 54, in the part of this branch of constant width l5, outside the overmolded part 522, 524.
  • the two injection points are provided at the level of a surface of the mold forming the same front face 30a of link 30.
  • the traces of the injection points on link 30 are visible at figures 3 and 4 , with the references 62 and 64, respectively on the branches 52 and 54. These two injection points 62 and 64 are symmetrical with respect to the plane Y10 Z10.
  • the parting line delimited by the injection mold is formed at the level of the median plane P30.
  • the synthetic material used may or may not be a charged polymer, for example a polyamide 6.6 charged with molybdenum.
  • the quantity of material injected into the mold is sufficient to fill the cavity, so that the synthetic material surrounds the ends 324 and 344 of the strands on all sides, which ensures efficient mechanical anchoring of these strands in the link. 30 once the injection is complete and the synthetic material cools and forms the eyelet 36 around the impression.
  • Polyamide 6.6 has the advantage of being very fluid when it is heated to a sufficient temperature, which ensures complete filling of the mold cavity during injection.
  • the molybdenum filler improves the sliding of the link 30 against the neighboring wires, when the beam 10 is mounted within the shed forming mechanism 12.
  • the stringer After cooling of the synthetic material, the stringer is ejected by means of ejectors integrated into the mold, in a transverse direction, that is to say parallel to the axis Z10, by exerting a force on the front face 30b of the opposite link. to the front face 30a onto which the injection points open out.
  • the beam is then in the configuration of figures 3 to 6 .
  • the eyelet 36 is delimited by the synthetic material which constitutes the link 30.
  • a protective sleeve is affixed around the end 524 or 544 of each branch 52 or 54 and an adjacent portion of strand 32 or 34.
  • This jacket is preferably made of epoxy resin and affixed in a viscous state all around each end 524 or 544. When cured, it forms a smooth continuous transition zone between the outer surface of a branch 52 or 54 and the outer surface of the adjacent strand 32 or 34, without risk of catching with a neighboring wire.
  • Such a shirt is visible at the figure 7 with the reference 546 an equivalent sleeve being affixed at the level of the end of the branch 52 opposite the eyelet 36.
  • end pieces 38 and 42 can also be overmolded on the first ends 322 and 342 of the strands 32 and 34, in specific injection indentations, during the same step as the overmolding of the link 30.
  • the nature of the synthetic material used for the overmolding can be adapted to the nature of the threads provided to pass through the shed forming mechanism 12, in order to ensure good physicochemical compatibility between these materials.
  • the link 30 is not metallic, the risks of corrosion are avoided, therefore the risks of abrasion of the warp yarns due to the modification of the surface condition of the link are also avoided.
  • the invention makes it possible to manufacture heddles of different lengths by simply varying the length of the strands 32 and 34, between their ends 322 and 324, on the one hand, 342 and 344, on the other hand, and keeping the same link 30 and the same end caps 38 and 42.
  • the overmolding on the second shaped ends of the strands, produced at the level of the branches 52 and 54, makes it possible to obtain an anchoring between the strands 32 and 34 and the link 30 by creating a mechanical stop of the synthetic material of each branch against the end of the corresponding strand in the two longitudinal directions represented by the arrows F1 and F2 parallel to the axis X10, as well as in the two lateral directions represented by the arrows F3 and F4 parallel to the axis Y10 and in both directions transverse represented by arrows F5 and F6 parallel to the Z10 axis.
  • the conformation of the ends 324 and 344 in a zigzag fashion with at least one corrugation by relative to the longitudinal axis facilitates the anchoring of the strands in the synthetic material, while limiting the impact on the density of the stringers because, when the direction of corrugation is orthogonal to the transverse axis Z10, the maximum transverse dimension of the strands smooth, that is to say the thickness e5 of the branches 52 and 54, is not increased by the zigzag conformation of the strands.
  • the use of strands with a circular section makes it possible to obtain a rounded contact surface, continuous and without roughness over the entire length of these strands exposed to the outside of the link 30 and of the end pieces 38 and 42.
  • the reduced width l5 of the branches 52 and 54 relative to the width outer l3 of the eyelet leaves more space for neighboring threads.
  • the relatively large length L5 of the branches 52 and 55 promotes contact of the neighboring warp yarns with these branches in an open shed, including when the neighboring yarns have an origin offset vertically with respect to the warp yarn passing through a heddle 10, like this is represented at the figure 1 .
  • the warp threads originate in the fabric from points which can be shifted in height, which, in the example of figure 1 has the effect of shifting down the two warp threads 6 which pass through the heddles 10 shown in the upper position on the right of this figure 1 , with respect to the eyelet of the beam 10 shown in the high position on the left of this figure.
  • the relatively large length L5 of the branches 52 and 54 allows these two offset son, in the same high shed opening position as the heddle shown on the left, to be in contact with the branch 54 of the eyelet 30 of the heddle shown. on the left, even though they originate from a point of the fabric T located below the point of origin of the warp thread 6 passing through the heddle shown on the left.
  • the length L5 of the branches 52 and 54 favors the contact of the warp yarns 6 with the links 30 of the heddles of the shed forming mechanism 12, in the shed opening configuration, rather than a contact. direct with metal strands 32 and 34.
  • the total length L30 of the link is compatible with a molding without burrs at the parting line. A greater length could indeed generate burrs because the longer a molded part is, the greater the risk of burrs at the parting line.
  • the zones or flats 366 and 368 of the eyelet 36 allow the beam to be oriented with its plane X10Y10 practically parallel with the direction of a warp wire 6 passing through the eyelet 36, which makes it possible to optimize the passage of this warp thread in the middle of the other warp threads.
  • the width l6 is suitable for a warp wire of the ribbon type or of relatively large diameter, in particular greater than 1 mm.
  • the frustoconical nature of the ends 524 and 544 with an angle ⁇ identical over the entire circumference of the strand ensures a homogeneous filling of the mold cavity on the circumference of the strand, which limits the risk of occurrence of overmolding burrs in this area.
  • the angle ⁇ between 125 ° and 150 °, preferably 140 ° also contributes to this function. This angle ⁇ also allows good adhesion of the epoxy resin liner 546.
  • the second end 344 of the strand 34 can be shaped with one or more through holes 382 in a direction perpendicular to the longitudinal axis X10, slots 384 on the outer surface of the strand and / or one or more localized crushings, the synthetic material of the link filling or surrounding these arrangements to be anchored on the second end of the strand during the overmolding of the link.
  • the corrugations of the first embodiment and the arrangements 382, 384 and 386 of the second embodiment constitute protruding and / or recessed reliefs from the second end of the strand allowing the anchoring of the synthetic material of the strand. branches 52 and 54 with the second end of the strand.
  • the synthetic material used may be a polymer loaded with fibers, in particular with carbon fibers, or a synthetic material other than a polymer, in particular a synthetic ceramic.
  • Shirts 546 and equivalent are optional.
  • strands of synthetic material can be used, preferably with a circular section.
  • the thickness of the strand measured parallel to the axis Z10, remains less than or equal to 0.4 mm.
  • the beam described can be adapted to a fabric up to 80mm thick, in particular by adopting a length L5 up to 81 mm.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (15)

  1. Litze (10) für ein Webgeschirr (16) eines Jacquard-Webstuhls (2), diese Litze umfassend zwei Stränge (32, 34), die jeweils an einem ersten Ende (322, 342) mit einem Organ (38, 42) zum Anhängen der Litze an ein Element (18; 26) des Webgeschirrs (16), sowie einem Glied (30) mit einer Öse (36) zum Führen eines Kettfadens (6) ausgestattet sind, wobei die Öse (36) entlang einer Längsachse (X10) der Litze zwischen den beiden Strängen angeordnet ist und das Glied (30) aus Kunststoffmaterial ist und umfassend zwei Zweige (52, 54), die beidseitig der Öse (36) entlang der Längsachse (X10) angeordnet sind
    dadurch gekennzeichnet, dass
    - ein Abschnitt (522, 542) von jedem Zweig des Glieds an einem zweiten Ende (324, 344) eines Strangs (32, 34) gegenüber seinem ersten Ende (322, 324) angeformt ist, wobei das zweite Ende in Längsrichtung von der Öse (36) versetzt ist,
    - jeder Zweig (52, 54) des Glieds (30) das zweite Ende (324, 344) des entsprechenden Strangs (32, 34) vollständig umschließt
    - das zweite Ende von jedem Strang (32, 34) mit einer Geometrie geformt ist, die dazu bestimmt ist, eine Verankerung auszuführen, die sich einer Verschiebung des umspritzten Abschnitts des Zweigs des Glieds in Bezug auf das zweite Ende des entsprechenden Strangs (32, 34) entsprechend zwei entgegengesetzten Längsrichtungen (F1, F2) widersetzt,
    - die Öse (36) von dem Kunststoffmaterial begrenzt wird, aus dem das Glied (30) besteht.
  2. Litze nach Anspruch 1, dadurch gekennzeichnet, dass jeder Strang (32, 34) fadenförmig ist und sein zweites Ende (324, 344) mit mindestens einer Riffelung ausgebildet ist, die sich seitlich (F3, F4) in Bezug auf die Längsachse (X10) und senkrecht zu einer Mittelachse (Z10) der Öse (36) erstreckt.
  3. Litze nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Stärke des Glieds, gemessen in einer Querrichtung (F5, F6) parallel zu einer Mittelachse (Z10) der Öse (36), entlang der Längsachse (X10) variabel ist, wobei das Glied (30) auf Ebene seines Abschnitts (522, 542), das auf das zweite Ende (324, 344) eines Strangs (32, 34) umspritzt ist, eine maximale Stärke (e5) aufweist, und auf Ebene der Öse (36) eine minimale Stärke (e3) aufweist, wobei das Verhältnis (e5/e3) zwischen der maximalen Stärke und der minimalen Stärke größer als oder gleich wie 1,2 ist.
  4. Litze nach Anspruch 3, dadurch gekennzeichnet, dass die Stärke von jedem Strang (32, 34), gemessen in einer Querrichtung (F5, F6) parallel zu einer Mittelachse (Z10) der Öse (36), gleich 0,4 mm ist, dass die maximale Stärke (e5) des Glieds 1 mm ist und dass die minimale Stärke (e3) des Glieds 0,8 mm ist.
  5. Litze nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass jeder Strang (32, 34) ein fadenförmiges Element mit kreisförmigem Querschnitt ist und dass jeder Zweig (52, 54) des Glieds (30) gegenüber der Öse (36) in einem kegelstumpfförmigen Abschnitt (524, 544) endet, der auf dem Strang zentriert ist.
  6. Litze nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die maximale Breite (I5) von jedem Zweig (52, 54), gemessen in einer seitlichen Richtung (F3, F4) senkrecht zu der Längsachse (X10) und zu einer Mittelachse (Z10) der Öse, deutlich geringer ist als die maximale Breite (I3) des Glieds, gemessen in derselben seitlichen Richtung auf Ebene der Öse (36), wobei das Verhältnis der Breite (£5) von jedem Zweig (52, 54), gemessen auf Ebene seines umspritzten Abschnitts (522, 542) an dem zweiten Ende (324, 344) des entsprechenden Strangs (32, 34), zu der maximalen Breite (I3) des Glieds (30) auf Ebene der Öse (36) vorzugsweise kleiner als oder gleich wie 0,5 ist.
  7. Litze nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Länge (L52) des umspritzten Abschnitts (522, 542) eines Zweigs (52, 54) des Glieds (30) kleiner als oder gleich wie die halbe Länge (L5) dieses Zweigs ist, wobei die Längen parallel zu der Längsachse (X10) gemessen werden.
  8. Litze nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Länge (L5) von jedem Zweig (52, 54), gemessen parallel zu der Längsachse (X10), größer als oder gleich wie 10 mm ist.
  9. Litze nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Öse (36) eine ovale Form mit abgestumpften und geradlinigen Enden (366, 368) entlang der Längsachse (X10) aufweist, deren Breite (I6), gemessen in einer seitlichen Richtung (F3, F4) senkrecht zu der Längsachse (X10) und zu einer Mittelachse (Z10) der Öse, größer als oder gleich wie 1,2 mm, vorzugsweise größer als oder gleich wie 1,4 mm ist.
  10. Litze nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Kunststoffmaterial der Verbindung (30) ein Polymer ist und die Stränge (32, 34) aus Metall, vorzugsweise aus rostfreiem Stahl, sind.
  11. Litze nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass ein der Öse (36) gegenüberliegender Endabschnitt (524, 544) von jedem Zweig (52, 54) und ein angrenzender Abschnitt des entsprechenden Strangs (32, 34) mit einem Schutzmantel (546), vorzugsweise aus Epoxidkleber, überzogen sind.
  12. Webstuhl, der einen Massenbildungsmechanismus (12) beinhaltet, umfassend eine Jacquard-Maschine (14), ein Webgeschirr (16) und eine Litzenanordnung (10), dadurch gekennzeichnet, dass mindestens eine der Litzen (10) der Litzenanordnung nach einem der vorherigen Ansprüche ist.
  13. Webstuhl(2) nach Anspruch 12, die zum Weben eines Gewebes (T) mit einer Stärke (eT) von mehr als 5 mm konfiguriert ist, dadurch gekennzeichnet, dass jeder Zweig (52, 54) des Glieds (30) der Litze (10) eine parallel zu seiner Längsachse (X10) gemessene Länge (L5) aufweist, die streng größer ist als die Stärke (eT) des Gewebes.
  14. Verfahren zur Herstellung einer Litze nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass es mindestens die Schritte umfasst, die aus Folgendem bestehen:
    a) Ausbilden mindestens eines Endes (324, 344) von jedem der zwei fadenförmigen Elemente, die dazu bestimmt sind, die Litzen (32, 34) zu bilden, mit einer Geometrie, die dazu bestimmt ist, eine Verankerung auszuführen,
    b) Anordnen der zwei fadenförmigen Elemente in einer Spritzgussform mit ihren ausgebildeten Enden (324, 344), die einander in einem Formhohlraum gegenüberliegen,
    c) Einspritzen einer Menge an Kunststoffmaterial in den Hohlraum, um das Glied (30) mit der Öse (36) zu formen, wobei jedes ausgebildete Ende (324, 344) vollständig von dem Kunststoffmaterial umgeben wird.
  15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, dass in Schritt c) das Kunststoffmaterial durch zwei Einspritzpunkte (62, 64) eingespritzt wird, die sich an einer Endfläche (30a) des Glieds (30) befinden, wobei diese Einspritzpunkte vorzugsweise jeweils auf Ebene eines anderen Zweigs (52, 54) des Glieds angeordnet sind.
EP17182946.8A 2016-07-25 2017-07-25 Litze für jacquard-webrahmen, ihr herstellungsverfahren und webrahmen, der eine solche litze umfasst Active EP3276058B1 (de)

Applications Claiming Priority (1)

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FR1657121A FR3054246B1 (fr) 2016-07-25 2016-07-25 Lisse pour metier jacquard, son procede de fabrication, et metier a tisser comprenant une telle lisse

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EP3276058B1 true EP3276058B1 (de) 2022-01-05

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CA (1) CA2974141A1 (de)
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EP3739092B1 (de) * 2019-05-13 2023-07-19 Stäubli Italia S.p.A. Fachbildungsvorrichtung zum etikettieren von webkanten oder geweben auf einer webmaschine und verfahren zur anpassung solch einer fachbildungsvorrichtung
CN110592764A (zh) * 2019-10-08 2019-12-20 南京工业职业技术学院 一种可更换孔芯的通丝目板及其制备方法
FR3105269B1 (fr) * 2019-12-20 2021-12-31 Staubli Lyon Lisse pour métier à tisser et harnais équipé d’une telle lisse
CN116288854B (zh) * 2023-01-09 2023-10-03 无锡长江精密纺织有限公司 一种经向缩率可变的综框装置

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US4355665A (en) * 1980-05-26 1982-10-26 Bracker Ag Heddle
CN2096572U (zh) * 1990-12-06 1992-02-19 赵振华 塑料编织袋圆织机用吊综带
FR2718810B1 (fr) * 1994-04-19 1996-06-14 Staubli Verdol Dispositif d'assemblage de l'extrémité d'un ressort hélicoïdal par rapport à un autre organe.
FR2770541B1 (fr) * 1997-11-05 1999-12-24 Staubli Lyon Dispositif d'accrochage d'une lisse a un cordon, lisse de metier a tisser comprenant un tel dispositif d'accrochage et metier a tisser equipe d'une telle lisse
FR2835538B1 (fr) * 2002-02-07 2004-05-21 Staubli Lyon Lisse et son procede de fabrication, dispositif de formation de la foule et metier a tisser incorporant une telle lisse
FR2888256B1 (fr) * 2005-07-06 2007-09-21 Staubli Lyon Sa Dispositif d'accrochage entre elements d'un dispositif de formation de la foule, son procede de fabrication et procede d'accrochage au moyen d'un tel dispositif
US20070079887A1 (en) * 2005-10-10 2007-04-12 Gtp Greenville, Inc. Plastic heddle
CN202466034U (zh) * 2012-03-12 2012-10-03 天津海天长丰科技开发有限公司 碳纤维布织造用棕丝
FR3027315B1 (fr) * 2014-10-16 2019-04-26 Staubli Lyon Lisse pour metier a tisser et metier equipe d'une telle lisse
FR3027314B1 (fr) * 2014-10-16 2019-04-26 Staubli Lyon Lisse pour metier a tisser et metier a tisser equipe d'une telle lisse
FR3027313B1 (fr) * 2014-10-16 2016-11-18 Staubli Lyon Lisse pour metier a tisser, metier a tisser equipe d'une telle lisse et procede de fabrication d'une telle lisse
KR200478899Y1 (ko) * 2015-07-21 2015-12-01 권정하 직기용 종광

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KR20180011738A (ko) 2018-02-02
CN107653543A (zh) 2018-02-02
CA2974141A1 (fr) 2018-01-25
KR102399302B1 (ko) 2022-05-18
US10260176B2 (en) 2019-04-16
EP3276058A1 (de) 2018-01-31
FR3054246B1 (fr) 2018-08-31
CN107653543B (zh) 2021-08-10
FR3054246A1 (fr) 2018-01-26

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