EP3374553A2 - Dispositif d'ouverture d'un élément de préhension de fil de trame d'une machine à tisser à projectiles, élément de préhension associé et procédé d'ouverture d'un tel élément de préhension - Google Patents

Dispositif d'ouverture d'un élément de préhension de fil de trame d'une machine à tisser à projectiles, élément de préhension associé et procédé d'ouverture d'un tel élément de préhension

Info

Publication number
EP3374553A2
EP3374553A2 EP16828790.2A EP16828790A EP3374553A2 EP 3374553 A2 EP3374553 A2 EP 3374553A2 EP 16828790 A EP16828790 A EP 16828790A EP 3374553 A2 EP3374553 A2 EP 3374553A2
Authority
EP
European Patent Office
Prior art keywords
gripping element
weft
opening
gripping
weft yarn
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.)
Granted
Application number
EP16828790.2A
Other languages
German (de)
English (en)
Other versions
EP3374553B1 (fr
Inventor
Luigi Pezzoli
Nello Pezzoli
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.)
P T M T Srl
PTMT SRL
Original Assignee
P T M T Srl
PTMT SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by P T M T Srl, PTMT SRL filed Critical P T M T Srl
Publication of EP3374553A2 publication Critical patent/EP3374553A2/fr
Application granted granted Critical
Publication of EP3374553B1 publication Critical patent/EP3374553B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • D03D47/12—Looms 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
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • 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
    • D03D47/12—Looms 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
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • D03D47/23—Thread grippers

Definitions

  • the present invention refers to a device for opening a gripping element of weft yarn of a gripper loom, a related gripping element and a method for opening such gripping element.
  • the present invention refers to a version of weaving looms eguipped with a single gripper which, by moving for the whole width of the fabric, reaches the opposite end, grips the weft and drags it to the other end.
  • These looms are usually defined as mono-grippers .
  • the means of transport of the gripper can indifferently be flexible belts or rigid rods.
  • weaving of particular wefts is more and more requested, such as to require a unilateral inserting system, a driven gripper, a mono-gripper .
  • a driven gripper inserted on a side of the fabric reaches the opposite end, pushed by a flexible belt or by a rigid rod. After having reached the end, the gripper grips the weft, reverses its motion for travelling back on the section in an opposite direction. After having reached the opposite end to the gripping, a pitch closure and an abutment end the weaving cycle, creating the fabric weaving.
  • Negative gripping the gripper equipped with wedge means hooks the yard adapted to slide to be inserted; no part of the gripper is moved to grip the yarn. It is a simple system, which allows high speeds. However, such system lacks efficiency and reliability in case of particular yarns, straps, multiple yarns, irregular yarns, delicate yarns.
  • the gripper is opened and closed with suitable means through defined motion laws.
  • the yarn enters the gripper with a substantially free path, because part of this is moved for creating room for entering the yarn and grip it. It is clear that this type of gripping is not heavily affected by the physical characteristics of the yarn, being able to use a controlled opening and closing of the gripper itself.
  • this system requires a more complex and heavier gripper structure, in addition to actuating means which interact with the warp yarn.
  • the interaction of the actuating means for the gripper with the warp yarn is translated into a pressure onto the mobile part of the gripper, with the danger of creating undesired effects, such as the surface damaging of the warp yarn.
  • Patent document WO2011018062A1 discloses a gripper of a textile machine comprising a blocking device for a ribbon-shaped weft material adapted to be inserted in the pitch of a textile loom.
  • the blocking device comprises a fixed gripping element and a spring-loaded gripping element, moving around a rotation axis and adapted to be actuated by control means to be able to open the blocking device, each gripping element having a blocking surface.
  • the gripper comprises a loom, wherein the blocking surfaces are arranged substantially outside the loom.
  • Patent EP2462267B1 discloses a device for inserting a weft yarn, preferably shaped as a ribbon, comprising a supplying assembly for a gripping element of a mechanical loom with a blocking device for blocking a free end of the weft yarn, wherein the blocking device is substantially moving along the moving direction of the gripping element, between at least two different operating positions.
  • the device for inserting a weft yarn comprises a drive for moving the blocking device, wherein the blocking device can be moved by means of a linkage comprising at least one rotatable arm adapted to be actuated by the motor.
  • the drive is independent, while the linkage comprises two parallel rotating arms connected through a coupling element, wherein the blocking device is arranged next to the coupling element.
  • Object of the present invention is solving the above prior art problems, by providing a solution to opening the gripping elements which is capable of not damaging the warp yarn.
  • a further object is opening such gripping elements according to a rigorous motion law capable of guaranteeing the gripping of particular weft such as ribbons and straps.
  • FIG. 1 shows a front view of a first embodiment of the device for opening a gripping element of weft yarn of a gripper loom, according to the present invention
  • FIG. 2 shows a front axonometric view of the device of the previous figure
  • FIG. 3 shows a front view on the rear of the device of the previous figure
  • FIG. 5 shows a front view of a second embodiment of the device for opening a gripping element of weft yarn of a gripper loom, according to the present invention
  • FIG. 6 shows a front axonometric view of the device of the previous figure
  • FIG. 7 shows a front view on the rear of the device of the previous figure
  • FIG. 8 shows a rear axonometric view of the device of the previous figure
  • Figures 9, 10, 11 show orthogonally projected views of a first embodiment of the gripping element of weft yarn of a gripper loom, according to the present invention
  • FIG. 12 shows a front axonometric view of the gripping element of the previous figure
  • FIG. 13 shows a plan view of the assembly formed by the gripping element of the previous figure interacting with the device of Figures 1 to 4;
  • Figures 14, 15, 16 show orthogonally projected views of a second embodiment of the gripping element of weft yarn of a gripper loom, according to the present invention
  • FIG. 17 shows a front axonometric view of the gripping element of the previous figure.
  • FIG. 18 shows a plant view of the assembly formed by the gripping element of the previous figure interacting with the device of Figures 5 to 8.
  • a device 10, 100 for opening a gripping element 1010, 1100 of weft yarn of a gripper loom, between a supplying assembley and the gripping element 1010, 1100 comprises opening means 11, 101 and positioning means 12, 102, moving between at least two different operating positions, in a plane containing a direction line of the gripping element 1010, 1100, a drive 20 adapted to control the motion of the opening means 11, 101 and of the positioning means 12, 102, through a linkage 21, 22.
  • the motion of the opening means 11, 101 and of the positioning means 12, 102 occurs in the same motion direction of the gripping element 1010, 1100 of weft yarn.
  • the opening means 11, 101 and the positioning means 12, 102 do not interact with the warp yarn.
  • the gripping element 1010, 1100 When opening, the gripping element 1010, 1100 does not interact with the warp yarn.
  • the opening means 11, 101 comprise a punch
  • the positioning means 12, 102 comprise an appendix
  • Both the punch and the appendix belong to a runner 23 connected to the linkage 21, 22.
  • the runner 23 slides along a guide 24 in the same motion direction of the gripping element 1010, 1100 of weft yarn.
  • a second configuration given by the device 100 comprises blocking means 30 adapted to keep the weft yarn blocked in a preset position.
  • the blocking means 30 comprise a drive 31 adapted to control a brake of the weft 32.
  • the appendix belonging to the positioning means 102 is equipped with a positioning profile having substantially a central hollow zone adapted to allow the weft yarn to freely slide.
  • the gripping element 1010, 1100 of weft yarn of a gripper loom actuated by the device 10 comprises at least one gripper with a front opening adapted to receive at least the punch belonging to the opening means 11, 101.
  • Such front opening is formed between a main body 1011, 1101 and a cover 1012, 1102.
  • the main body 1011, 1101 interacts with the cover 1012, 1102 through elastic elements 1013, 1103, 1104.
  • the elastic elements 1104 are composed of a series of leaf springs arranged as a fan, comprising at least one leaf spring slanted with respect to the insertion direction to allow distributing the load in many points.
  • the arrangement of these leaf springs as afan is useful to guarantee a more uniform and efficient gripping, in order to embrace as much as possible the operating range of the elastic elements.
  • a method for opening the gripping element 1010 of weft yarn actuated by the device 10 comprises the following steps :
  • a hook 1014 belonging to the gripping element 1010 overcomes the weft remaining substantially in a lowered position while the gripping element 1010 is next to its reversal;
  • the runner 23 upon reversing the gripping element 1010, the runner 23 continues for a short section to follow the gripping element 1010, allowing a perfect insertion of the weft in the holding area; e) the runner 23 reaches its reversal while the gripping element 1010 continues with its return movement ; f) the two movements, by being combined, perform the closure of the cover 1012, performing the gripping;
  • the gripping element 1010 in its return movement, the gripping element 1010 reaches and overcomes the cutting device which, by cutting the weft from the fabric, allows reaching the opposite end.
  • a method for opening the gripping element 1100 of weft yarn actuated by the device 100 comprises the following steps :
  • the alredy cut weft is kept in a preset position by the positioning profile 102, very near the end of the fabric;
  • the punch 101 will place the positioning profile 102 inside the body of the gripping element 1100, till the weft, which is always unmoving, will be overcome by the gripping element 1100; e) upon reverting the motion of the gripping element 1100, the punch 101 with the positioning profile 102, by sliding on the weft, extremely accurately positions this latter one next to the gripping element 1100;
  • the brake 32 frees the weft by letting it slide.
  • the device for opening a gripping element of weft yarn of a gripper loom of the present invention allows obtaining its stated objects.
  • the device allows positioning the weft, opening and closing in a controlled and positive way the gripper without having interactions with the warp yarn of the loom.
  • the invention deals with an innovative opening and closing system and its corresponding positive gripper to obtain the function of a positive gripping adapted to operare with particular wefts, solving the above described negative aspects.
  • the advantages introduced by such system are:
  • the components of the device are: the opening punch equipped with a positioning profile for the weft and shaped in its front part with a pyramid profile towards the sliding direction of the gripper; the punch, sliding in a guide parallel to the sliding direction of the gripper and preferably actuated by a motor controlled through a linkage or directly through a motor of the linear type; a gripper composed of a main body and of a cover made in such a way that the front part of the assembly allows entering the punch.
  • the tapered punch, the motion law of the gripper, and the motion law of the motor completely define the gripping mode.
  • the motor through an adjustment of the motion law, makes the gripping singular for every type of weft provided by the design of the fabric being executed.
  • the main body houses the elastic elements which interact with the cover.
  • the device has two executions.
  • the first one provides for the front part of the cover equipped with an open hook towards the opposite end of the fabric.
  • the seconda one has an arrangement adapted for particularly wide wefts, better identified as ribbons, and provides for a front part of the gripper body and of the cover extended towards the fabric.
  • the punch is equipped with a positioning profile having substantially a central hollow zone whose sizes are adequate to the weft to be woven. The weft must be able to easily slide within this recess .
  • the arrangement of the elastic elements is very particular.
  • the elastic elements lay in planes parallel to the sliding direction of the weft.
  • a leaf spring has been added, which is slanted with respect to the insertion direction. This particular is very important, since it allows using materials for the gripper parts which are different from metals, like the most suitable composites for possible skidding with adjacent parts made of metal.
  • the novelty consists in that there are many elastic elements arranged not along the same direction, but as a fan, in order to embrace as much as possible the operating range of the elastic elements.

Landscapes

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

Abstract

L'invention concerne un dispositif (10, 100) permettant d'ouvrir un élément de préhension (1010, 1100) de fil de trame d'une machine à tisser à projectiles, comprenant un moyen d'ouverture (11, 101) et un moyen de positionnement (12, 102), se déplaçant entre deux positions de fonctionnement différentes, un entraînement (20) conçu pour commander le mouvement du moyen d'ouverture (11, 101) et du moyen de positionnement (12, 102). L'invention concerne en outre un élément de préhension (1010, 1100) de fil de trame d'une machine à tisser à projectiles actionné par ledit dispositif (10, 100). L'invention concerne en outre un procédé d'ouverture dudit élément de préhension (1010, 1100) de fil de trame.
EP16828790.2A 2015-11-11 2016-11-10 Élément de préhension de fil de trame d'une machine à tisser à projectiles avec un dispositiv d'ouverture de cet élément de prehension Active EP3374553B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A005478A ITUB20155478A1 (it) 2015-11-11 2015-11-11 Dispositivo per l?apertura di un elemento di presa di filo di trama di un telaio a pinza, relativo 5 elemento di presa e metodo di apertura di un tale elemento di presa
PCT/IT2016/000264 WO2017081712A2 (fr) 2015-11-11 2016-11-10 Dispositif d'ouverture d'un élément de préhension de fil de trame d'une machine à tisser à projectiles, élément de préhension associé et procédé d'ouverture d'un tel élément de préhension

Publications (2)

Publication Number Publication Date
EP3374553A2 true EP3374553A2 (fr) 2018-09-19
EP3374553B1 EP3374553B1 (fr) 2020-01-15

Family

ID=55446932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16828790.2A Active EP3374553B1 (fr) 2015-11-11 2016-11-10 Élément de préhension de fil de trame d'une machine à tisser à projectiles avec un dispositiv d'ouverture de cet élément de prehension

Country Status (4)

Country Link
EP (1) EP3374553B1 (fr)
CN (1) CN108291336A (fr)
IT (1) ITUB20155478A1 (fr)
WO (1) WO2017081712A2 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606040B1 (fr) * 1986-10-31 1988-12-02 Materiel Textile Ste Alsacienn Dispositif pour l'insertion des fils de trame sur les metiers a tisser sans navette
IT1254987B (it) * 1992-06-23 1995-10-11 Luciano Corain Perfezionamento in una pinza di trazione per telaio tessile
CN1216586A (zh) * 1996-04-19 1999-05-12 皮克诺尔公司 一种织机的片梭的片梭夹钳的打开装置
DE29908543U1 (de) * 1999-05-14 1999-08-12 Lindauer Dornier Gmbh, 88131 Lindau Steuereinrichtung zur Betätigung des Klemmhebels eines Greifers, insbesondere eines Nehmergreifers in Greiferwebmaschinen
DE10134504A1 (de) * 2001-07-05 2003-01-16 Picanol Nv Verfahren und Vorrichtung zum Öffnen einer Greiferklemme eines Greifers einer Webmaschine
DE50213973D1 (de) * 2002-09-20 2009-12-10 Picanol Nv Gebergreifer für eine greiferwebmaschine
ITMI20030293U1 (it) * 2003-06-26 2004-12-27 Promatech Spa Apripinza motorizzato perfezionato
DE102009036589A1 (de) 2009-08-07 2011-02-10 Lindauer Dornier Gmbh Vorrichtung zum Übergeben eines bandförmigen Schussmaterials
DE102009037127A1 (de) 2009-08-11 2011-02-17 Lindauer Dornier Gmbh Greiferkopf einer Webmaschine

Also Published As

Publication number Publication date
ITUB20155478A1 (it) 2017-05-11
WO2017081712A2 (fr) 2017-05-18
CN108291336A (zh) 2018-07-17
WO2017081712A3 (fr) 2017-06-15
EP3374553B1 (fr) 2020-01-15

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