EP2573241B1 - Bringergreifer und Nehmergreifer für Webmaschinen - Google Patents

Bringergreifer und Nehmergreifer für Webmaschinen Download PDF

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Publication number
EP2573241B1
EP2573241B1 EP12183579.7A EP12183579A EP2573241B1 EP 2573241 B1 EP2573241 B1 EP 2573241B1 EP 12183579 A EP12183579 A EP 12183579A EP 2573241 B1 EP2573241 B1 EP 2573241B1
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EP
European Patent Office
Prior art keywords
grippers
pair
gripper
carrying
wedge
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Application number
EP12183579.7A
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English (en)
French (fr)
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EP2573241A1 (de
EP2573241B9 (de
Inventor
Giuseppe Casarotto
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Itema SpA
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Itema SpA
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    • 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
    • D03D47/233—Carrying grippers
    • 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
    • D03D47/236—Drawing grippers

Definitions

  • the present invention refers to a pair of improved carrying and drawing grippers, respectively, for a weaving loom.
  • the invention concerns a pair of grippers which have a higher degree of safety in connection with the interference relationship with the warp yarns as well as a longer useful life.
  • Such interference implies problems both in terms of the integrity of the warp yarns - which can remain entangled on the gripper and hence be cut or deviated by the movement of the gripper, causing the halt of the loom or the presence of weaving defects - and in connection with gripper wear with the formation of possible fine cracks and notches.
  • the presence of these micro-defects on the surfaces of the grippers in contact with the warp yarns increases of course the frequency of the cases of warp yarn catching by the grippers and furthermore determines dangerous trigger points of fatigue failure, so that the useful life duration of the grippers is currently fully unsatisfactory.
  • US 4259997 describes a carrying gripper constructed of sheet metal parts which are plastically deformed, associated among them through screws.
  • the problem underlying the invention is hence that of suggesting a particular structure of a pair of carrying and drawing grippers for weaving looms which allows to overcome the mentioned drawbacks and which hence allows to dramatically reduce the frequency of the cases of warp yarn catching by the grippers and furthermore to remarkably increase the duration of the useful life thereof.
  • the body of the carrying gripper is built starting from a segment of metal profile 1, preferably an extruded piece made of light alloy, through mechanic machining operations by simple shaving removal.
  • the shape of such extruded piece is clearly visible in figs. 1A and 1B and has a generally D-shaped hollow section 1 of the central body thereof wherefrom a base element 2, a middle shelf 3 and an upper tile 4 project.
  • the curved portion of the D-shaped section 1 (on the right in fig. 1B ), which corresponds in the finished gripper to the side facing the reed, is radi-ussed in a continuous manner to tile 4 and separated from the base element by a deep guiding groove 5.
  • the middle shelf 3 projects in a crosswise direction, said shelf representing a fastening element for the gripper control belt in the finished gripper.
  • Tile 4 projects laterally to a greater extent than middle shelf 3 and represents a protection element of the weft gripping devices G, fastened in the inner portion of the gripper, as clearly visible in fig. 2B .
  • This particular building system of the gripper allows to have a gripper, which central body consists of a single piece having high structural rigidity and devoid of any notch effects due to the connections between different elements typical of the grippers of the prior art.
  • the gripper hence displays increased fatigue resistance and high stability and shape reproducibility, so that the usual adjustment and corrective operations by the weaver upon gripper replacement can be fully eliminated.
  • the majority of the outer surfaces of the gripper, which are intended to come into rubbing contact with the warp yarns consist of the extrusion surfaces of the extruded profile and hence already have per se a smoothness degree which does not require further machining operations.
  • extruded piece 1 already comprises all the essential gripper elements, the mechanic machining operations by shaving removal through which the finished carrier gripper is obtained are extremely simple and fast, also in the undercut areas, so that the carrying gripper of the invention is also a gripper of inexpensive manufacturing compared to the high technical performances it offers.
  • the mechanical machining operations of extruded piece 1 are performed so that the carrying gripper P of the present invention has the tip thereof aligned on the side facing towards the reed (the front side in fig. 2A ), so as to leave a wide space inside the gripper for the housing of the weft gripping devices G, which devices - as already mentioned above - are fully protected by tile 4 with respect to any possible interference with the warp yarns.
  • the drawing gripper T of the present invention is illustrated in figs. 3A and 3B and is of the type wherein the wedge-like end tip C, in order to free the gripped weft, is equipped with a first longitudinal movement according to arrow F, controlled by lever L in opposition to spring M, and with a second crosswise movement according to arrow H, which allows to accomplish a wide opening between the wedge-like end tip C and a hook-shaped element B very rapidly.
  • the lateral displacement of the wedge-like tip is instead obtained through the use of a permanent magnet 6, embedded in the body of the drawing gripper and capable of imparting a force of attraction on control rod 7 of wedge-like tip C as soon as said control rod, through the longitudinal movement according to arrow F, has freed itself of a counter-wedge 8, formed on the opposite side of the hook (G).
  • counter-wedge 8 prevents a premature lowering of the rod and hence the contact between rod 7 and magnet 6, until the end of the longitudinal travel of rod 7, thus avoiding any chafing of rod 7 on magnet 6, which chafing would impair the duration in time thereof.
  • This structure of the control device of the wedge-like tip has an extremely limited bulk, so that the gripper may have a much thinner design than known grippers and is hence capable of coming out of the shed without interfering with the warp yarns, even when the closing of the shed is advanced.
  • the drawing gripper of the invention is preferably made of steel.
  • the outer surface of the grippers is subject to an electrolytic coating treatment of a very thin surface layer of ceramic material through a technology known as PEO (Plasma Electrolytic Oxidation) which allows precisely to coat the gripper surfaces with dense and very hard layers of ceramic material having an extremely small thickness, for example preferably 20-30 micrometres, tightly gripped to the base material.
  • PEO Plasma Electrolytic Oxidation
  • This surface ceramic layer determines, as predictable, a net improvement of the useful life duration of the gripper, protecting the underlying metal material from the wear induced by the rubbing of the warp yarns. Due to the very small thickness of said ceramic layer furthermore does not change in any way the functional features of the gripper nor the mechanic details of the same, so that such treatment can be applied as final treatment at the end of all mechanic finishing operations.
  • Such ceramic layer furthermore determines, even though indirectly and in a fully surprising way, a dramatic abatement of the fatigue failure of the grippers, supposedly because the forming of micro-cracks and micro-notches is eliminated or strongly reduced, which act as trigger points for such fatigue failure.
  • the useful life duration of the grippers of the present invention is hence extended by a great deal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (10)

  1. Paar von Bringer-(P) und Nehmergreifern (T) für einen Webstuhl, dadurch gekennzeichnet, dass der Grundkörper des Bringergreifers durch ein maschinell bearbeitetes Segment eines extrudierten Metallprofils (1) gebildet ist.
  2. Paar von Greifern nach Anspruch 1, dadurch gekennzeichnet, dass das genannte extrudierte Teilprofil (1) einen im Ganzen D-förmigen Querschnitt des zentralen Grundkörpers davon aufweist, von dem ein Basiselement (2), ein mittleres Fach (3) und ein oberes Dachplattenelement (4) vorstehen.
  3. Paar von Greifern nach Anspruch 2, dadurch gekennzeichnet, dass der gekrümmte Abschnitt des D-Querschnitts des extrudierten Profils (1) einen kontinuierlichen Radius zu dem Dachplattenelement (4) aufweist und von dem Basiselement (2) durch eine tiefe Führungsnut (5) getrennt ist.
  4. Paar von Greifern nach Anspruch 2, dadurch gekennzeichnet, dass von dem geraden Abschnitt des D-förmigen Querschnitts des extrudierten Profils (1) das genannte Fach (3) in einer Querrichtung vorsteht, wobei das mittlere Fach - in dem fertigen Greifer - das Befestigungselement eines Steuergurts des Greifern darstellt.
  5. Paar von Greifern nach Anspruch 2, dadurch gekennzeichnet, dass der Traggreifer weiterhin Schussfadengreifvorrichtungen (G) aufweist, die in dem inneren Abschnitt des Greifers befestigt sind, und wobei das genannte Dachplattenelement (4) in Querrichtung weiter vorsteht als das mittlere Fach (3) und ein Schutzelement der Schussfadengreifvorrichtungen (G) darstellt.
  6. Paar von Greifern nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Zuggreifer von der Bauart ist, die eine keilförmige Endspitze umfasst, um den Schussfaden gegen ein hakenförmiges Element (B) zu erfassen, versehen mit einer ersten Längsbewegung und einer zweiten Längsbewegung der zu der ersten, zum Festlegen einer Weiten- und Schwellenöffnung zwischen der keilförmigen Endspitze (C) und dem hakenförmigen Element (B), dadurch gekennzeichnet, dass die genannte zweite Bewegung durch einen Permanentmagneten (6) erhalten wird, der in dem Greiferkörper integriert ist und geeignet ist, eine Anziehungskraft auf die Steuerstange (7) der keilförmigen Endspitze (C) auszuüben.
  7. Paar von Greifern nach Anspruch 6, dadurch gekennzeichnet, dass das hakenförmige Element (B) weiterhin mit einem Gegenkeil (8) versehen ist, auf der gegenüberliegenden Seite des hakenförmigen Elements (B), welches einen Kontakt zwischen der Steuerstange (7) und dem Magneten (6) bis zum Ende der genannten ersten längs gerichteten Öffnungsbewegung verhindert.
  8. Paar von Greifern nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass zumindest auf einem Teil der äußeren Oberfläche der Greifer eine Beschichtung aus einer dichten, harten und dünnen Oberflächenschicht eines keramischen Materials aufgebracht ist.
  9. Paar von Greifern nach Anspruch 8, dadurch gekennzeichnet, dass die genannte Schicht aus keramischem Material nach Abschluss aller mechanischen Bearbeitungsschritte der Greifer auf diese aufgebracht wird.
  10. Paar von Greifern nach Anspruch 9, dadurch gekennzeichnet, dass die Dicke der genannten Schicht aus keramischem Material 20 bis 30 Mikrometer beträgt.
EP20120183579 2011-09-22 2012-09-07 Bringergreifer und Nehmergreifer für Webmaschinen Active EP2573241B9 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001710A ITMI20111710A1 (it) 2011-09-22 2011-09-22 Coppia di pinze, portante e traente, perfezionate per telaio tessile.

Publications (3)

Publication Number Publication Date
EP2573241A1 EP2573241A1 (de) 2013-03-27
EP2573241B1 true EP2573241B1 (de) 2014-10-01
EP2573241B9 EP2573241B9 (de) 2015-04-22

Family

ID=44993691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120183579 Active EP2573241B9 (de) 2011-09-22 2012-09-07 Bringergreifer und Nehmergreifer für Webmaschinen

Country Status (3)

Country Link
EP (1) EP2573241B9 (de)
CN (1) CN103015005B (de)
IT (1) ITMI20111710A1 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259997A (en) * 1979-11-07 1981-04-07 Rockwell International Corporation Weft carrier
IT1290838B1 (it) * 1996-02-27 1998-12-14 Nuovo Pignone Spa Pinza di condotta perfezionata per telaio tessile a pinze
CN2332737Y (zh) * 1998-02-09 1999-08-11 李渭瀛 剑杆织机的送纬和接纬剑杆头
IT1304698B1 (it) * 1998-12-23 2001-03-28 Somet Soc Mec Tessile Coppia di pinze portanti e traente per telai di tessitura
JP2002173851A (ja) * 2000-12-08 2002-06-21 Tsudakoma Corp 緯入れ用レピアのレピアヘッド
DE60220788T2 (de) * 2002-08-30 2008-03-06 Promatech S.P.A., Colzate Verbesserungen an Schussfadengreifern für Webmaschinen und an Webmaschinen mit Führungsmitteln dafür
ITMI20030176U1 (it) * 2003-04-10 2004-10-11 Promatech Spa Pinza compatta a funzionamento perfezionato per telai tessili
DE102005014107A1 (de) * 2005-03-22 2006-09-28 Picanol N.V. Nehmergreifer mit einem hakenförmigen Einsatz und Verfahren zum Herstellen des hakenförmigen Einsatzes

Also Published As

Publication number Publication date
CN103015005A (zh) 2013-04-03
EP2573241A1 (de) 2013-03-27
ITMI20111710A1 (it) 2013-03-23
EP2573241B9 (de) 2015-04-22
CN103015005B (zh) 2016-08-03

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