EP3701071B1 - Ensemble de pinces pour insérer le fil de trame dans des métiers à tisser sans navette - Google Patents

Ensemble de pinces pour insérer le fil de trame dans des métiers à tisser sans navette Download PDF

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Publication number
EP3701071B1
EP3701071B1 EP18804148.7A EP18804148A EP3701071B1 EP 3701071 B1 EP3701071 B1 EP 3701071B1 EP 18804148 A EP18804148 A EP 18804148A EP 3701071 B1 EP3701071 B1 EP 3701071B1
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EP
European Patent Office
Prior art keywords
gripper
slider
yarn
hook
shaped portion
Prior art date
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Application number
EP18804148.7A
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German (de)
English (en)
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EP3701071A1 (fr
Inventor
Luciano Corain
Nicola DAL BIANCO
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Santex Rimar Group SRL
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Santex Rimar Group SRL
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Publication of EP3701071A1 publication Critical patent/EP3701071A1/fr
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    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20Constructional features of the thread-engaging device on the inserters
    • D03D47/23Thread grippers
    • D03D47/236Drawing grippers
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20Constructional features of the thread-engaging device on the inserters
    • D03D47/23Thread grippers
    • D03D47/233Carrying grippers

Definitions

  • the present invention refers generally to a gripper assembly of a weft yarn for the insertion in shuttle-less weaving looms.
  • the invention relates to a pair of grippers (carrier or bringer gripper and pulling or taker gripper) of the negative exchange type and suitable for the production of woven and warp weaving looms in shuttle-less looms, with innovative elements for holding the yarn between the gripping elements, so as to ensure a reliable grip of the weft, transport to the center of the fabric, switch and release of the yarn exiting the fabric using a wide range of yarns for classic fabrics and technical fabrics
  • the weaving insertion techniques which characterize the looms without shuttle to produce woven weaves of warp and weft, now widespread, are of the gripper type, projectile, air jet, water jet.
  • the water jet loom is not very versatile and with problems of pollution, the air-jet loom is moderately versatile but with high energy consumption, while the projectile loom is medium-high versatility but with limits for control of the weft yarn tension and mechanically complex.
  • the gripper technology is very widespread due to its high versatility characteristics combined with good productivity levels.
  • the grippers are the devices of the loom dedicated to the operation of inserting the weft through the warp and a gripper loom is generally provided with a pair of grippers, one on each side, respectively of carrier and of traction, which moves with alternate motion and opposed, each from an external position to the fabric to the center of the same where it reverses the motion to return to its starting position external to the fabric.
  • a first gripper defined as bringer, grabs the head of weft to bring it to the center of the fabric where it switches it with the second gripper, called the taker gripper, which grabs the head and drags it to the external edge of the second half of the fabric.
  • the switch of the weft yarn between the bringer gripper and the taker gripper at the center of the fabric can be of the positive or negative type.
  • the positive switch inside the warp step takes place with the intervention at the center of the fabric of special gripper opening hooks, which, projecting between the yarn of the lower part of the warp, actuate the closing or opening of the holding organs of the weft of the grippers for transferring the yarn from one to the other gripper.
  • Such blades or hooks, source of interference with the warp are incompatible with various types of fabric and generally result in wear and costs for spare parts.
  • the negative switch of the yarn between the bringer gripper and the taker gripper is caused by the traction caused by weft-weaving devices, placed at the entrance of the fabric, which act on the yarn while it is inserted between the holding elements; the aforesaid holding elements are arranged to obtain a controlled friction on the yarn and slide it between the gripping elements perpendicularly to the axis of the yarn, without slipping out longitudinally.
  • the yarn coming from one edge of the fabric is selected by the color selector, inserted into the bringer gripper, sliding between the holding elements, cut and carried to the point of switch with the taker gripper, which, with its own holding elements, it grabs the head and completes the insertion.
  • the grippers have guide profiles which predispose the yarn lying between an abutment and a resilient rocker pin with respect to a horizontal axis and longitudinal holding elements constituted by the part of the pin which, driven by a reaction spring, retains the yarn resting on an element below that can be rigid or elastic.
  • the holding points of the taker gripper up to now in use are of the type with surfaces kept close by a spring-operated rocker arm between which the yarn is inserted, or of the fixed wedge type with an angle suitable to allow progressive locking by friction of the yarn pulled towards the vertex; a combination of a fixed wedge and an elastic blade is also used, which remains close to the support and is also closed when the yarn is released at the end of insertion.
  • the taker gripper hooks the yarn presented by the bringer gripper, holding it while it is inserted between the holding members until it locks between them without sliding during the dragging path; moreover, when the taker gripper is out of the fabric, it must be able to open instantaneously to release the yarn which must leave the holding points practically in the absence of friction.
  • the object of the present invention is to provide a gripper assembly for inserting the weft yarn in shuttle-less weaving looms, which sequentially ensures grip of the weft, transport to the center of the fabric, switch and release of the output yarn with high reliability for a wide range of twisted, parallel, fancy, multi-filament, single-filament yarns, metalized strips or metallic yarns, for each type of fabric.
  • a pair of grippers of the negative switch type is used, with innovative components of the members for gripping and holding the yarn.
  • a gripper assembly for inserting the weft yarn in shuttle-less weaving looms, according to the attached claim 1.
  • a rocker pin rotating about a preferably vertical axis of the gripper body, is provided, on one side, with a yarn gripping arm which in section has a wedge shape, with angle to the vertical plane equal to that of the part of the profile against which it is pushed backed by a leaf spring which acts on the other side of the rocker pin.
  • the tension of the yarn determines by friction a force resulting from the contrast between the two inclined surfaces; this force, transversal to the pin, tends to bring it to a further closure and therefore improves the restraint in running with limited force of the closing spring and, consequently, to facilitate the entry of the yarn into the pin, which is ultimately self-locking.
  • the gripper assembly substantially comprises a bringer gripper and a taker gripper.
  • the bringer gripper comprises a main body (1) with a shaped end adapted to be fixed to a command element, a weft guide profile (2), a rocker lever (3) hinged on a rotation pin (4) and a reaction spring (6);
  • the gripper element consists of a pin (5) for gripping the rocker lever (3), which is rotating about a preferably vertical axis of the main body (1) of the gripper, while the spring (6) maintains in closure the pin of the lever (3) on one side and pushes it on the other side to an inclined plane which, thanks to the pull of the yarn (7), makes it self-locking.
  • the bringer gripper advancing towards the selected weft and arranged in a nearly horizontal position, inserts the yarn (7), coming from a bobbin and present by a selector, at the grip points constituted by an abutment (8) and from the intersection between the pin (5) and the abutment surface of the weft guide profile (2).
  • the taker gripper which exchanges the yarn (7) at the center of the fabric with the bringer gripper, comprises a main body (10) having a shaped end to be fixed to the tape or rod which makes the stroke, a central part, which includes a lever (12) for operating the opening or closing of the zone for gripping the yarn (7) and a longitudinally sliding element, consisting of a rod (11) made of flexible material, which has a terminal part or slider (14) that slides in a hook-shaped portion (15), arranged at the opposite end (A) of the main body (10).
  • the slider (14) is pushed by a spring (13) towards the projecting profile (17) inside the hook portion (15) and against the surface (16) of the aforesaid portion (15), which forms a determined angle with the slider (14), while an elastic blade (18), integral with the slider (14), is pushed against the surface (16), from which it separates, at the opening of the slider (14), due to the effect of guide profile (17), which causes the blade (18) to move away from the surface (16) because the blade (18) rests with the relative tooth (19) to the slider (14).
  • the switch of the weft yarn from the bringer gripper to the taker gripper begins with the insertion of the yarn (7) between the surface (16) of the hook-shaped portion (15) and the profile (20) of the blade (18). Since the blade (18) is flexible, it is distanced from the surface (16) according to the pull and the thickness of the yarn (7) resting on the surface (16) with an adjustable preload acting on the screw (21) that allows to adapt the gripper to the types of weaves in process.
  • the yarn continues towards the vertex of the angle formed by the surface (16) and by the slider (14) up to the point allowed by its thickness, in correspondence with which, it's blocked by of the frictions involved between the yarn (7) and the grip elements of the gripper.
  • the opening for releasing the yarn (7) is obtained by the pressure of an external profile on the lever (12), which by rotating causes the rod (11) to slide to the slider (14), causing it to withdraw from the portion (A) in the shape of a hook (15).
  • the rod (11) which is elastically inflected in the main body (10) of the taker gripper, keeps the slider (14) pushed towards the profile (17) of the hook (15) of the gripper and, moving backwards, moves away from the surface (16), creating an opening that leaves the yarn (7) free to abandon the aforementioned taker gripper.
  • the taker gripper includes a first elastic element and a second rigid element, which open simultaneously in phase of releasing the yarn (7), and the elastic rod (11), mounted in an inflected position, sliding longitudinally, causing the area of gripping to open between the slider (14) and the blade (18), while the blade (18) allows a gradual beginning of restraining of the yarn(7) until it stops at the bottom of the fixed angle between the surface (16) and slider (14) and a quick opening for the release.

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

Claims (9)

  1. Ensemble de pinces pour insérer le fil de trame dans des métiers à tisser sans navette, comprenant une pince d'amenée et une pince de prise, lesdites pinces étant appropriées pour produire des tissus tissés de trame et de chaîne par la réalisation d'une première étape de pincement de la trame, une deuxième étape de transport vers le centre du tissu, une troisième étape de commutation et une quatrième étape d'achèvement du transport et de libération du fil dans le tissu, dans lequel ladite pince de prise, qui échange le fil (7) au centre du tissu entre ladite pince de prise et ladite pince d'amenée et achève l'insertion, comprend un corps principal (10), façonné sur un côté pour être fixé à une bande ou une tige, une partie centrale ayant un levier d'entraînement (12) permettant d'ouvrir ou de fermer une zone de pincement du fil (7), une tige coulissant de manière longitudinale (11), infléchie de manière élastique à l'intérieur du corps principal (10), et un coulisseau (14), apte à coulisser dans une partie en forme de crochet (15), qui se rétracte en éloignement par rapport à une surface (16) de ladite partie en forme de crochet (15), caractérisé en ce que ledit coulisseau est poussé contre un profilé guide (17) de la partie en forme de crochet (15), et en ce que ledit coulisseau tracte avec lui une lame élastique (18), qui s'appuie par une dent (19) contre ledit coulisseau (14) et suit les mouvements dudit coulisseau (14), en ouvrant ainsi simultanément ledit coulisseau (14) et ladite lame élastique (18) afin de libérer le fil (7) de ladite pince de prise.
  2. Ensemble de pinces tel que revendiqué dans la revendication 1, caractérisé en ce que ladite pince d'amenée comprend un corps principal (1) ayant une extrémité façonnée apte à être fixée à une bande ou une tige, un profilé guide de trame (2), un culbuteur ou un levier (3) articulé sur une broche de rotation (4) et un ressort de réaction (6), ladite pince d'amenée ayant une broche de pincement (5) dudit culbuteur (3) qui est apte à tourner autour d'un axe vertical du corps principal (1) de ladite pince et ledit ressort de réaction (6) étant apte à maintenir en fermeture ladite broche de pincement (5) sur un côté, et à amener ladite broche (5), sur le côté opposé, à s'appuyer contre un plan incliné, de façon à prendre un état auto-serrant.
  3. Ensemble de pinces tel que revendiqué dans la revendication 2, caractérisé en ce que ladite broche (5) est tirée vers une surface de butée dudit profilé guide de trame (2), grâce à la force de traction du fil (7) et grâce à la force de frottement entre le fil (7) et les surfaces de butée, de façon à serrer ledit fil (7) sans augmenter la charge dudit ressort de réaction (6).
  4. Ensemble de pinces tel que revendiqué dans au moins l'une des revendications précédentes, caractérisé en ce que ledit coulisseau (14) est entraîné par un élément élastique (13) vers un profilé guide (17) de ladite partie en forme de crochet (15) et contre ladite surface (16) de la partie en forme de crochet (15), qui forme un angle avec ledit coulisseau (14).
  5. Ensemble de pinces tel que revendiqué dans au moins l'une des revendications précédentes, caractérisé en ce que ladite lame élastique (18) est solidaire dudit coulisseau (14) et est poussée contre ladite surface (16) de la partie en forme de crochet (15), ladite lame élastique (18) s'éloignant de ladite surface (16) au niveau de l'ouverture dudit coulisseau (14) en raison de l'effet dudit profilé guide (17) qui amène ladite lame élastique (18) à rester éloignée de ladite surface (16), de sorte que ladite lame élastique (18) repose, par une dent associée (19), sur ledit coulisseau (14).
  6. Ensemble de pinces tel que revendiqué dans au moins l'une des revendications précédentes, caractérisé en ce que ledit fil (7) est inséré entre ladite surface (16) de la partie en forme de crochet (15) et un profilé (20) de ladite lame élastique (18), ladite lame élastique (18) étant espacée de ladite surface (16) en fonction de la traction et de l'épaisseur du fil (7) et en fonction de la précharge dudit élément élastique (13), qui est réglable au moyen d'un vis (21) selon les types de trames.
  7. Ensemble de pinces tel que revendiqué dans au moins l'une des revendications précédentes, caractérisé en ce que le fil (7) est libéré par la pression d'un profilé externe dudit levier d'entraînement (12), ledit profilé externe étant apte à faire tourner et coulisser ledit élément longitudinal (11) qui est solidaire dudit coulisseau (14), de façon à éloigner ledit coulisseau (14) de ladite partie en forme de crochet (15).
  8. Ensemble de pinces tel que revendiqué dans au moins l'une des revendications précédentes, caractérisé en ce que ladite tige coulissante (11), qui est infléchie de manière élastique à l'intérieur du corps principal (10) de la pince de prise, pousse ledit coulisseau (14) contre ledit profilé guide (17) de la pince de prise, ledit coulisseau (14) étant apte à se rétracter et s'éloigner de ladite surface (16) de façon à créer une ouverture qui laisse le fil (7) libre de quitter ladite pince de prise.
  9. Ensemble de pinces selon la revendication 8, caractérisé en ce que, lorsque ledit coulisseau (14) est éloigné de ladite surface (16) de la partie en forme de crochet (15), ladite lame élastique (18) est tractée et s'appuie contre ledit coulisseau (14) et suit le mouvement dudit coulisseau (14), de sorte que le fil (7) est libéré de ladite pince de prise sans frottement.
EP18804148.7A 2017-10-26 2018-10-23 Ensemble de pinces pour insérer le fil de trame dans des métiers à tisser sans navette Active EP3701071B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000121914A IT201700121914A1 (it) 2017-10-26 2017-10-26 Gruppo di presa per l’inserzione del filo di trama in telai senza navetta
PCT/IT2018/050205 WO2019082222A1 (fr) 2017-10-26 2018-10-23 Ensemble de pinces pour insérer le fil de trame dans des métiers à tisser sans navette

Publications (2)

Publication Number Publication Date
EP3701071A1 EP3701071A1 (fr) 2020-09-02
EP3701071B1 true EP3701071B1 (fr) 2021-06-30

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EP18804148.7A Active EP3701071B1 (fr) 2017-10-26 2018-10-23 Ensemble de pinces pour insérer le fil de trame dans des métiers à tisser sans navette

Country Status (10)

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EP (1) EP3701071B1 (fr)
JP (1) JP7291961B2 (fr)
KR (1) KR102554487B1 (fr)
CN (1) CN111356800B (fr)
EA (1) EA039748B1 (fr)
ES (1) ES2887778T3 (fr)
IT (1) IT201700121914A1 (fr)
MA (1) MA50462B1 (fr)
PT (1) PT3701071T (fr)
WO (1) WO2019082222A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110093705A (zh) * 2019-05-24 2019-08-06 桐乡市广逸纺织有限公司 一种剑杆织机用剑头

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH639439A5 (de) * 1979-09-05 1983-11-15 Rueti Ag Maschf Greiferkopf fuer webmaschinen mit entnahme des schussfadens von ortsfesten spulen.
IT1132844B (it) * 1980-09-15 1986-07-09 Nuovo Pignone Spa Perfezionamenti nelle pinze passatrama per telai tessili
CN2073427U (zh) * 1990-07-27 1991-03-20 施金钟 改进的剑杆织机用左边纬纱夹纱器
IT1245580B (it) * 1991-03-22 1994-09-29 Somet Soc Mec Tessile Pinza traente per telai di tessitura senza navetta, in particolare per la lavorazione di filato sintetico
IT1254987B (it) * 1992-06-23 1995-10-11 Luciano Corain Perfezionamento in una pinza di trazione per telaio tessile
IT1274589B (it) * 1994-08-05 1997-07-18 Nuovo Pignone Spa Sistema perfezionato di presa e serraggio della trama nella pinza di trazione di un telaio tessile
KR100330283B1 (ko) 1998-03-09 2002-06-20 이규건 위사반송그리퍼
KR200241611Y1 (ko) * 1998-05-08 2001-11-22 이규건 위사인출그리퍼에서의슬라이더지지체
JP2002146649A (ja) * 2000-11-10 2002-05-22 Toyota Industries Corp レピア織機における緯入れ装置
CN200967866Y (zh) * 2006-09-14 2007-10-31 浙江虎王数控科技有限公司 剑杆织机用剑杆头送纬剑
CN105658856B (zh) * 2013-10-24 2018-01-09 米歇尔.范德威尔公司 送纬剑杆头、送纬剑杆、剑杆式织机 及织机引入纬纱方法

Also Published As

Publication number Publication date
MA50462B1 (fr) 2021-09-30
EA202090837A1 (ru) 2020-07-09
ES2887778T3 (es) 2021-12-27
JP7291961B2 (ja) 2023-06-16
JP2021500487A (ja) 2021-01-07
PT3701071T (pt) 2021-09-16
EA039748B1 (ru) 2022-03-05
KR20200071093A (ko) 2020-06-18
KR102554487B1 (ko) 2023-07-11
MA50462A (fr) 2021-04-07
EP3701071A1 (fr) 2020-09-02
WO2019082222A1 (fr) 2019-05-02
CN111356800B (zh) 2021-06-18
CN111356800A (zh) 2020-06-30
IT201700121914A1 (it) 2019-04-26

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