EP1013806B1 - Pair of weft carrying and drawing grippers for weaving looms - Google Patents

Pair of weft carrying and drawing grippers for weaving looms Download PDF

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Publication number
EP1013806B1
EP1013806B1 EP99106429A EP99106429A EP1013806B1 EP 1013806 B1 EP1013806 B1 EP 1013806B1 EP 99106429 A EP99106429 A EP 99106429A EP 99106429 A EP99106429 A EP 99106429A EP 1013806 B1 EP1013806 B1 EP 1013806B1
Authority
EP
European Patent Office
Prior art keywords
pair
grippers
weft
carrying
weft carrying
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.)
Expired - Lifetime
Application number
EP99106429A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1013806A1 (en
Inventor
Ermanno Franz
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.)
Promatech SpA
Original Assignee
Promatech SpA
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 Promatech SpA filed Critical Promatech SpA
Publication of EP1013806A1 publication Critical patent/EP1013806A1/en
Application granted granted Critical
Publication of EP1013806B1 publication Critical patent/EP1013806B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D03D47/12—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
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J5/00—Shuttles
    • D03J5/06—Dummy shuttles; Gripper shuttles
    • 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 concerns a pair of weft carrying and drawing grippers for shuttleless looms and, in particular, the general structure of such grippers.
  • a pair of weft carrying and drawing grippers according to the preamble of claim 1 is known from US-A-4 757 844.
  • the object of the present invention is to thus supply a pair of weft carrying and drawing grippers - making the most of the materials now available and adopting a different construction technique to produce the same - with improved performances for what concerns all the three aforecited features - i.e. dimensional stability, mass reduction, and wear resistance - so as to be perfectly suited for use in the high-performance looms now existing on the market, said grippers having higher performances and a longer working life than the grippers of known technique.
  • each of the grippers of said pair comprises:
  • the carrying gripper is formed by a plurality of components, each meant to improve, as better explained hereinafter, a special mechanical feature of the gripper in its whole.
  • Each of said components is then planned to have dimensions such as to reduce its mass to a minimum, compatibly with the functions it has to perform, so as to achieve also the object of an overall lightening of the gripper.
  • the carrying gripper thus comprises first of all a stiff structural support element 1, meant to supply the dimensional stability and rigidity to the gripper, and to act as an element onto which are released the active and passive forces present during the to-and-fro movement of the gripper.
  • the support element 1 has the general structure of an angle bar, whose vertical side is suitably tapered along its upper edge 1b, where the warp yarns rub onto the gripper at its outlet from the closing shed.
  • the outer surface of the vertical side of said angle bar preferably comprises a shaped depressed zone 1a, for connection of the support element 1 to a metal body 2 carrying the weft yarn gripping devices P.
  • Both the vertical side and the horizontal base of the support element 1 comprise a plurality of through holes for connection to the other components of the gripper, as better described hereinafter.
  • the base of the element 1 has cylindrical holes, while the holes on its side comprise, on their inner part, a countersink for the head of the fixing screw.
  • the structural support element 1 is produced by extrusion of long carbon fibers, thoroughly bound and distributed into a matrix of suitable thermosetting resin, such as for example an epoxy resin.
  • a suitable thermosetting resin such as for example an epoxy resin.
  • This technique known in the sector as "poltrusion” technique, is carried out - according to the present invention - by positioning the carbon fibers contained in the matrix of thermosetting resin both in a longitudinal sense, parallel to the extrusion direction, and in a sense perpendicular thereto, according to specific weight percentages in the two directions.
  • the fiber/resin weight ratio is in the range between 60/40 and 80/20.
  • This manufacturing technique allows to obtain a component wherein both the horizontal base and the vertical side have a high flatness - of the order of millimeter hundredths - combined with a high thermal, hygroscopic and viscous-elastic stability, both with and without loads applied on the gripper. Furthermore, the mass of the element 1 is reduced by about 50% in respect of a similar element forming part of a conventional gripper.
  • a second component of the carrying gripper consists of the metal body 2.
  • Said body 2 forms the gripper head and carries the weft yarn gripping devices P, which shall not be described in detail herein since they are of no interest in relation to the present invention.
  • the metal body 2 is preferably produced starting from sheet steel, 1 mm thick, die-formed into the wanted shape and then deep-drawn.
  • Said metal body 2 comprises a rearward extension 2a, to be connected to the support element 1 in correspondence of its depressed zone 1a, so as to efficiently oppose the combined bending and compressive stress to which the gripper is subjected by the weft yarn during its insertion into the loom shed.
  • the body 2 comprises a series of holes (three in fig. 2), mating with corresponding holes provided on the vertical. side of the element 1, to allow a firm and longlasting anchorage of the metal body 2 to the support element 1 by means of the screws 4.
  • the screws 4 are in fact inserted with their head from the inner side of the element 1 and are then tightened into the metal threading of the holes formed in the metal body 2; on tightening of the screws 4, it is thus the metal body 2 which is subjected to tensile stresses, while the element 1 merely works under compression, thereby ensuring a steady hold of the coupling even with the high stresses and vibrations which characterize the normal working of the gripper, and which could compromise the holding of the screws 4, in the long run, if these were screwed into the element 1 of plastic material and not into the body 2 of metallic material.
  • the screws 4 could be replaced by rivets; in this case, the coupling between the element 1 and the body 2 takes up the configuration shown in detail in fig. 3.
  • the upper edge 1b of the support element 1 and the top part of the extension 2a of the metal body 2 have an identical profile, with no peaks or sharp bends, so as to provide a uniformly inclined and radiused bearing surface, between the gripper head and the strap N, for the warp yarns bearing onto the gripper surface during its outlet from the loom shed.
  • the aforedescribed gripper configuration enables the warp yarns to impart on the gripper a perfectly gradual load - according to the closing of the shed - and thus free from peaks which, due to the high moving speed of the gripper, would at once produce impacts thereon.
  • the surface of the gripper along which slide the warp yarns - instead of being formed by the upper edge 1b of the support element 1 and by the adjacent top part of the extension 2a of the metal body 2 - is formed by a flange 3 of the extension 2a, bent by 90° during the deep-drawing process of the metal body 2 so as to cover the whole upper edge 1b of the support element 1.
  • the advantage of this solution is to improve the rigidity and mechanical resistance of the extension 2a of the metal body 2; however, to make sure that the working life of the carrying gripper corresponds to that of the drawing gripper, it is preferable - in this embodiment - to carry out a surface hardening treatment on the flange 3, so that its wear resistance may be comparable to that of the poltruded material forming the corresponding portion of the drawing gripper.
  • a third gripper component consists of a wearplate 5 fixed, by means of screws 6, in correspondence of suitable threaded seats provided in the support base S for the gripping devices P housed into the metal body 2.
  • the support base S is preferably obtained by molding of plastic material, and in this case said seats consist of innerly threaded metal inserts buried into the base S during the molding process.
  • the wearplate 5 forms, in known manner, the final length of the gripper strap N; it is in fact meant to be replaced more frequently than the other components, being more subject to wear, so as to guarantee an equal working life of the gripper components and of the strap.
  • Said wearplate is preferably made from cotton fabric impregnated with phenolic resin, or from polystyrene fabric impregnated with epoxy resin. The wear resistance of such materials is then further improved with an artificial aging treatment, for example an oven drying followed by dipping into an oil bath.
  • the different gripper components, assembled together by means of the screws 4 and 6 - as specified hereabove - are finally fixed to the gripper strap N by making use of an abutting element 7, which forms the fourth and last gripper component.
  • Said element 7 comprises a plurality of threaded inserts 7a, for example of brass or other metallic material, buried into a matrix of thermoplastic material, as for example a polyamide resin, filled with short glass or carbon fibers.
  • the fiber/resin weight ratio is preferably in the range between 20/80 and 40/60.
  • the abutting element 7 is advantageously produced with an injection molding process, by positioning the threaded metal inserts 7a into suitably spaced cavities provided for the purpose in the mold.
  • the purpose of the abutting element 7 is to evenly distribute over the bearing surface of the support element 1 the fixing load concentrated on the threaded inserts 7a, and to simultaneously allow short assembly times by supplying the threaded inserts in a shape easy to handle and in the preset mounting position and distance.
  • this latter comprises thickenings 7b in correspondence of the inserts 7a and thinner parts between one insert and the next. It is moreover necessary for the abutting element 7 to have a perfectly flat bearing surface, so as to uniformly mate with the horizontal base of the support element 1 onto which it bears.
  • the fixing of the strap N to the gripper body is in fact obtained by means of screws 8 (four in fig. 2) which cross said strap, eventually the end of the wearplate 5, the corresponding through holes formed in the horizontal base of the support element 1, and finally tighten into the threaded metal inserts 7a of the abutting element 7.
  • screws 8 four in fig. 2 which cross said strap, eventually the end of the wearplate 5, the corresponding through holes formed in the horizontal base of the support element 1, and finally tighten into the threaded metal inserts 7a of the abutting element 7.
  • the aforedescribed abutting element 7 besides providing - as seen - a fixing system of easy, quick and safe application, has the additional advantage of involving a low cost, so that, in case the fixing means should get damaged (due, for instance, to stripping of the thread), said element can be easily replaced, without having to replace more important and costly elements of the gripper.
  • the metal body 12 of the drawing gripper carrying the gripping devices, has a far shorter longitudinal extension than the corresponding metal body 2 of the carrying gripper. As known, this depends on the fact that said body is subjected by the weft yarn to a simple tensile force. Seen the reduced extension of the metal body 12, the support element 11 has a further length in respect of the corresponding support element 1 of the carrying gripper, so as to allow anchoring the wearplate 15 which, in this case, is thus fixed to the support element 11 by means of an additional abutting element 17'.
  • the drawing gripper involves no other significant structural changes in respect of the heretofore described carrying gripper.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Artificial Filaments (AREA)
EP99106429A 1998-12-23 1999-03-29 Pair of weft carrying and drawing grippers for weaving looms Expired - Lifetime EP1013806B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998MI002804A IT1304698B1 (it) 1998-12-23 1998-12-23 Coppia di pinze portanti e traente per telai di tessitura
ITMI982804 1998-12-23

Publications (2)

Publication Number Publication Date
EP1013806A1 EP1013806A1 (en) 2000-06-28
EP1013806B1 true EP1013806B1 (en) 2003-12-03

Family

ID=11381328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99106429A Expired - Lifetime EP1013806B1 (en) 1998-12-23 1999-03-29 Pair of weft carrying and drawing grippers for weaving looms

Country Status (8)

Country Link
EP (1) EP1013806B1 (zh)
KR (1) KR20000057083A (zh)
CN (1) CN1109144C (zh)
DE (1) DE69913301T2 (zh)
ES (1) ES2209264T3 (zh)
HK (1) HK1029380A1 (zh)
IT (1) IT1304698B1 (zh)
TW (1) TW498117B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011134953A2 (en) 2010-04-29 2011-11-03 Picanol Rapier and gripper weaving machine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1256644B1 (en) * 2001-05-08 2009-06-17 Promatech S.p.A. Weft carrying gripper for weaving looms adjustable in respect of the thickness of the weft yarn
FR2903425B1 (fr) * 2006-07-07 2008-08-29 Schonherr Textilmaschb Gmbh Lance,son procede de fabrication,dispositif d'insertion de fils de trame comprenant une telle lance et metier a tisser comprenant un tel dispositif
ITMI20111710A1 (it) * 2011-09-22 2013-03-23 Promatech Spa Coppia di pinze, portante e traente, perfezionate per telaio tessile.
DE102018222722B3 (de) * 2018-12-21 2019-12-19 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Bringer-greiferkopf, webmaschine mit einem solchen bringer-greiferkopf und verfahren zum doppelschusseintrag
KR102523106B1 (ko) 2021-03-30 2023-04-17 (주)위브넥스 제직기용 위사 공급 그리퍼

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1196138B (it) * 1984-06-07 1988-11-10 Vamatex Spa Coppia di pinze portatrama per telai di tessitura senza navette a struttura perfezionata
US4757844A (en) * 1987-05-05 1988-07-19 Vamatex S.P.A. Weft grippers for shuttleless weaving looms
JPH0665487U (ja) * 1993-02-19 1994-09-16 金剛鐵工廠股▲ひん▼有限公司 杼無し織機の糸のグリッパー
KR19980020091U (ko) * 1996-10-07 1998-07-15 심윤규 레피아직기용 좌측그리퍼의 개량구조
KR200206021Y1 (ko) * 1998-08-13 2001-03-02 심윤규 개량 레피아 헤드 그립퍼

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011134953A2 (en) 2010-04-29 2011-11-03 Picanol Rapier and gripper weaving machine

Also Published As

Publication number Publication date
EP1013806A1 (en) 2000-06-28
IT1304698B1 (it) 2001-03-28
HK1029380A1 (en) 2001-03-30
ITMI982804A1 (it) 2000-06-23
CN1257947A (zh) 2000-06-28
ES2209264T3 (es) 2004-06-16
KR20000057083A (ko) 2000-09-15
DE69913301D1 (de) 2004-01-15
TW498117B (en) 2002-08-11
DE69913301T2 (de) 2004-11-18
CN1109144C (zh) 2003-05-21

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