EP3947797B1 - Contrôle du positionnement et de la continuité de fils dans un métier à tisser - Google Patents

Contrôle du positionnement et de la continuité de fils dans un métier à tisser Download PDF

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Publication number
EP3947797B1
EP3947797B1 EP20726209.8A EP20726209A EP3947797B1 EP 3947797 B1 EP3947797 B1 EP 3947797B1 EP 20726209 A EP20726209 A EP 20726209A EP 3947797 B1 EP3947797 B1 EP 3947797B1
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EP
European Patent Office
Prior art keywords
loom
carbon
threads
electrical contacts
weaving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20726209.8A
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German (de)
English (en)
French (fr)
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EP3947797A1 (fr
Inventor
Mathieu Julien CHARLAS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Aircraft Engines SAS
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Safran Aircraft Engines SAS
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Publication of EP3947797A1 publication Critical patent/EP3947797A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/367—Monitoring yarn quantity on the drum
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/20—Warp stop motions
    • D03D51/28—Warp stop motions electrical
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J1/00—Auxiliary apparatus combined with or associated with looms
    • D03J1/007—Fabric inspection on the loom and associated loom control
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J2700/00—Auxiliary apparatus associated with looms; Weavening combined with other operations; Shuttles
    • D03J2700/06—Auxiliary devices for inspecting, counting or measuring
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/10—Inorganic fibres based on non-oxides other than metals
    • D10B2101/12—Carbon; Pitch

Definitions

  • the present invention relates to the field of weaving looms and in particular those which use carbon fibers for producing fiber reinforcements for parts made of composite material.
  • warp also called warping
  • warping is a very tedious operation because it consists of placing each carbon thread one after the other in perforated boards allowing the threads to be arranged for weaving or in heddle eyelets. and to attach them to the system for calling up the yarns present at the exit of the loom.
  • This operation is a source of errors because the number of carbon threads to be placed can be very large, for example more than a hundred, with a very small gap between each thread.
  • CN 206 376 057 U discloses an opto-electronic sensor with a laser to detect the breakage of carbon threads stored on reels.
  • a weaving installation comprising a weaving loom intended to produce a woven texture by weaving between a plurality of yarns, at least part of the yarns of the plurality of yarns being yarns of carbon, the carbon threads each being stored individually on a spool of a plurality of carbon thread storage spools present upstream of the loom, characterized in that it comprises a plurality of pairs of first and second electrical contacts present between the storage bobbins and the loom, each pair of first and second electrical contacts being present in the path of a carbon thread, the first and second contacts of each pair being intended to be in electrical contact with a thread determined carbon, the contacts of each pair of first and second contacts being further connected to an open circuit detection circuit.
  • the weaving installation of the invention is able to control the preparation of the warp in the loom before weaving as well as the integrity of each warp thread during weaving. Indeed, concerning the preparation of the warp threads, if one or more of them are incorrectly positioned, the error is detected by the open circuit detection circuit(s) concerned, which allows the operator to correctly replace each incorrectly positioned thread before starting the loom. Similarly, if one or more warp threads break during weaving, this will be detected by the relevant open circuit detection circuit(s) allowing immediate intervention.
  • the first and second electrical contacts of each pair of first and second contacts are present respectively in the vicinity of a carbon yarn storage coil and in the vicinity of the entrance to the loom. This makes it possible to cover most of the path of the warp threads before they enter the loom.
  • each contact of the plurality of pairs of first and second electrical contacts comprises an electrically conductive element movable in rotation, each electrically conductive element being intended to be in contact with a thread of the plurality of carbon threads. This considerably limits the wear of the wires as they pass over the electrical contacts.
  • the latter further comprises a control system connected to the open circuit detection circuit, a control device being configured to emit a loom stop signal loom or an error signal in response to detecting an open circuit between the electrical contacts of at least a pair of first and second electrical contacts.
  • the installation is thus able to automatically control the loom in the event of an incident on one or more warp threads.
  • the open circuit detection circuit is a low voltage electric circuit. This prevents the possible appearance of electric arcs in the installation.
  • the invention also relates to a method for controlling the positioning and continuity of carbon yarns in a weaving installation in accordance with the invention comprising a weaving loom intended to produce a woven texture by weaving between a plurality of yarns, at least one part of the threads of the plurality of threads being carbon threads, the carbon threads each being stored individually on a reel of a plurality of storage reels of carbon threads present upstream of the loom, characterized in that it includes checking the presence of each carbon thread between the storage reels and the loom by detecting one or more open circuits.
  • the method of the invention makes it possible to check the correct positioning of the warp threads at the end of the preparation of the warp and to correct any positioning errors before the start of the loom, which makes it possible to ensure a compliant weave.
  • the method of the invention makes it possible to detect the breakage of a warp yarn in real time and thus to quickly apply a corrective measure if necessary.
  • the control of the presence of each carbon thread comprises the connection of each carbon thread to an open circuit detection circuit, the connection comprising making a first electrical contact on the carbon wire in the vicinity of a carbon wire storage reel and making a second electrical contact on the same carbon wire in the vicinity of the entrance to the loom at weave.
  • the taking of the first and second electrical contacts is carried out respectively with first and second electrically conductive elements mobile in rotation.
  • the latter further comprises the stopping of the loom or the emission of an error signal in response to the detection of the absence of a carbon yarn between the storage bobbins and the loom.
  • the open circuit detection circuit is a low voltage electric circuit.
  • FIG. 1 The figure 1 single is a schematic perspective view of a weaving installation according to one embodiment of the invention.
  • the invention applies generally to weaving looms used to produce fibrous textures with carbon fiber yarns, the yarns being stored upstream of a weaving loom in reels and unwound until the out of the loom.
  • the invention applies in particular to looms of the Jacquard type used in particular to produce fibrous textures or fabrics by two-dimensional (2D) and three-dimensional (3D) or multilayer weaving between layers of warp yarns and layers of frame.
  • the figure 1 very schematically illustrates a weaving installation 400 in accordance with one embodiment of the invention.
  • the weaving installation 300 comprises a loom 100 warp-fed with carbon yarns (yarns carbon fiber compounds).
  • the figure 1 illustrates only 6 carbon warp threads 210 to 215 each stored respectively on 6 spools 220 to 225.
  • the spools are stored in a rack also called a creel (not shown on the figure 1 ).
  • the weaving loom 100 comprises, from upstream to downstream, a first beam 110, a cross rod or bar 120 (which can be replaced by one or more hoppers), a harness 130, a reed 140, a shuttle or lance 150 and a second beam or roller 160 intended to draw the warp threads and roll up the woven fabric.
  • the harness 130 is provided with heddles 131 comprising eyelets (not shown) through which the warp threads 210 to 215 pass, the heddles 131 being moved in an upward or downward direction so as to create a passage or crowd in the axis of the path of the shuttle 150 intended to pass a weft thread 230.
  • the weaving installation 400 further comprises a plurality of pairs of first and second electrical contacts present between the storage reels and the loom, the pairs of contacts forming part of a positioning and continuity of the wires 300. More specifically, in the example described here, the installation comprises 6 pairs of first and second electrical contacts 301 and 302, 303 and 304, 305 and 306, 307 and 308, 309 and 310, and 311 and 312, intended to be brought into electrical contact with the carbon warp wires 210, 211, 212, 213, 214 and 215 respectively.
  • the first electrical contacts 301, 303, 305, 307 and 309 are preferably placed at the vicinity of the coils 220 to 225 while the second electrical contacts are preferably placed near the entrance to the loom 100 so as to cover the majority of the path of the warp yarns before they are weaved in the loom.
  • Each pair of electrical contacts is connected to an open circuit detection circuit described later in detail.
  • the conductive properties of the constituent carbon fibers of the carbon threads are advantageously used. Indeed, since carbon fibers are composed of graphitic domains, they have the electrical properties of graphite. Graphite is an anisotropic material with very good electrical conductivity in the direction of the graphene planes. As the graphitic domains are oriented in the longitudinal direction of the fibers, the latter have good thermal and electrical properties along the direction of the yarn.
  • the electrical resistivity of a fiber therefore decreases if its graphite character increases, the values vary from 900 ⁇ .cm for a high modulus fiber (350 to 500 GPa) to 1650 ⁇ .cm for fibers with lower moduli (200 at 300 GPa).
  • each warp yarn at the entrance to the loom can be continuously monitored (i.e. before and during weaving) thanks to a pair of electrical contacts present on the path of each yarn.
  • the electrical contacts of each pair can be static, that is to say they each consist of a fixed element having a conductive surface on which the carbon wire slides.
  • each electrical contact can be made up of an electrically conductive element that can move in rotation, which makes it possible to minimize the friction forces on the carbon wires and to reduce the risks of damaging said wires.
  • the first and second electrical contacts 301 and 302, 303 and 304, 305 and 306, 307 and 308, 309 and 310, and 311 and 312 of each pair consist of a wheel made of conductive metallic material electricity like copper for example.
  • the scrolling of a carbon thread between its storage reel and the loom causes the rotation of the two rollers forming the pair of first and second electrical contacts, which makes it possible to maintain permanent electrical contact with the thread. of carbon without wearing it down by friction.
  • the rollers used here can be of the pulley or roller type possibly associated with a spring retainer in order to better control the electrical contact with the wire without exerting excessive forces on the latter.
  • the wire positioning and continuity monitoring system 300 comprises a plurality of open circuit detection circuits which are each connected to a determined pair of first and second electrical contacts.
  • a single open circuit detection circuit 230 is shown in the figure. figure 1 , the circuit 230 being connected to the first and second electrical contacts 301 and 302 present on the path of the carbon wire 210.
  • Five other open circuit detection circuits are respectively connected to the pairs of first and second electrical contacts 303 and 304, 305 and 306, 307 and 308, 309 and 310, and 311 and 312.
  • the open circuit detection circuit 230 comprises voltage generator 231 associated in series with a resistor 232.
  • the circuit 230 further comprises a voltmeter 233 connected in parallel to the resistor 232.
  • the voltage measurement made by the voltmeter 233 is transmitted to a control device 250, for example a computer, via an analog/digital converter 234.
  • each contact pair make it possible to complete the open circuit detection circuit. In the event of absence or loss of contact of a carbon wire with at least one electrical contact of a pair of electrical contacts, the circuit becomes open and the voltage aux measured by the voltmeter is zero.
  • the control device 250 includes a dedicated input for each voltage measurement signal provided by an identified open circuit detection circuit in order to be able to determine which carbon wire is broken or misplaced in the event of detection of a open circuit.
  • the open circuit detection circuit 230 described above is only one embodiment of such a circuit. A person skilled in the art will readily consider other structures for producing an open circuit detection circuit.
  • control device can emit an error signal in order to alert an operator of the anomaly.
  • the control device can also be connected to the control device of the loom to send a stop signal to the latter in the event of detection of an open circuit corresponding to the breakage of a carbon yarn in order to stop the weaving. and minimize the loss of raw material.
  • the present invention makes it possible to control both the correct positioning of the yarns before starting the loom and their integrity or continuity throughout the weaving.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Woven Fabrics (AREA)
EP20726209.8A 2019-03-28 2020-03-16 Contrôle du positionnement et de la continuité de fils dans un métier à tisser Active EP3947797B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1903273A FR3094380B1 (fr) 2019-03-28 2019-03-28 Contrôle du positionnement et de la continuité de fils dans un métier à tisser
PCT/FR2020/050554 WO2020193907A1 (fr) 2019-03-28 2020-03-16 Controle du positionnement et de la continuite de fils dans un metier a tisser

Publications (2)

Publication Number Publication Date
EP3947797A1 EP3947797A1 (fr) 2022-02-09
EP3947797B1 true EP3947797B1 (fr) 2023-01-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20726209.8A Active EP3947797B1 (fr) 2019-03-28 2020-03-16 Contrôle du positionnement et de la continuité de fils dans un métier à tisser

Country Status (8)

Country Link
US (1) US20220170188A1 (zh)
EP (1) EP3947797B1 (zh)
JP (1) JP7462671B2 (zh)
CN (1) CN113646473B (zh)
BR (1) BR112021018972A2 (zh)
CA (1) CA3131481A1 (zh)
FR (1) FR3094380B1 (zh)
WO (1) WO2020193907A1 (zh)

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Also Published As

Publication number Publication date
CN113646473A (zh) 2021-11-12
EP3947797A1 (fr) 2022-02-09
JP7462671B2 (ja) 2024-04-05
CA3131481A1 (fr) 2020-10-01
WO2020193907A1 (fr) 2020-10-01
FR3094380A1 (fr) 2020-10-02
JP2022528525A (ja) 2022-06-14
CN113646473B (zh) 2022-12-20
BR112021018972A2 (pt) 2021-11-30
FR3094380B1 (fr) 2022-01-07
US20220170188A1 (en) 2022-06-02

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