EP0715009B1 - Moyen pour guider le mouvement d'une paire de griffes lelong de la foule de métiers à tisser - Google Patents

Moyen pour guider le mouvement d'une paire de griffes lelong de la foule de métiers à tisser Download PDF

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Publication number
EP0715009B1
EP0715009B1 EP95117867A EP95117867A EP0715009B1 EP 0715009 B1 EP0715009 B1 EP 0715009B1 EP 95117867 A EP95117867 A EP 95117867A EP 95117867 A EP95117867 A EP 95117867A EP 0715009 B1 EP0715009 B1 EP 0715009B1
Authority
EP
European Patent Office
Prior art keywords
strap
guide
guide elements
straps
shed
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
EP95117867A
Other languages
German (de)
English (en)
Other versions
EP0715009A1 (fr
Inventor
Giuseppe Casarotto
Massimo Arrigoni
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.)
NUOVA VAMATEX SpA
Promatech SpA
Original Assignee
NUOVA VAMATEX SpA
Vamatex Nuova 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 NUOVA VAMATEX SpA, Vamatex Nuova SpA filed Critical NUOVA VAMATEX SpA
Publication of EP0715009A1 publication Critical patent/EP0715009A1/fr
Application granted granted Critical
Publication of EP0715009B1 publication Critical patent/EP0715009B1/fr
Anticipated expiration legal-status Critical
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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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/271—Rapiers
    • D03D47/272—Rapier bands

Definitions

  • the present invention concerns means to guide the back and forth motion of a pair of weft yarn grippers along the shed of looms with continuous weft feed, of the type comprising two control straps caused to perform a rectilinear movement in opposed directions thanks to the action of two gearwheels with reciprocating motion.
  • the first looms of this type used to comprise two parallel and close rows of guide elements, positioned on both sides of each strap.
  • Such elements, mounted on the sley, were in the form of opposite hooks with substantially rectangular seats, into which the straps were slidably engaged with their lateral surfaces and the ends of their upper and lower surfaces.
  • This arrangement though being very efficient for a correct guiding of the grippers, determined an excessively high wear which became worse and worse as loom weaving speeds were increasing.
  • the weft yarns were often caught into the seat for the strap, remaining stuck therein and thus being subject to very frequent breakages.
  • Such an arrangement even produced damages in the warp yarns, as these were undesirably drawn apart by the guide elements of the row close to the reed, and could thus also get caught into the seats for the strap of the guide elements of said row and be easily broken.
  • a further solution consisted in limiting the guide elements to a single row of very simple hooks opposite to the reed, so as to guide the gripper straps only on the edge towards the fabric, letting them freely slide onto the lower warp lap on one side and against the reed on the other side.
  • Even this solution was however defective, in that the guiding was not sufficiently precise, especially at high speeds.
  • a shimming operation was moreover required on the reed and, to keep constant the trajectory of the strap, this latter had to be semirigid, thereby notably increasing costs.
  • Said undercut notch of the strap and, consequently, the portion of said guide elements apt to geometrically mate therewith, will preferably have a rectangular, trapezoidal or arched section.
  • the guide means of the present invention are shown mounted on a loom of the shuttleless type, with continuous weft feed, wherein the back and forth motion of a pair of weft grippers along the shed is obtained through a pair or straps moved by two gearwheels with reciprocating motion.
  • Fig. 1 illustrates the reed P, the sley C, and two healds L, in a loom.
  • Reference OI corresponds to the lower lap and reference OS to the upper lap of warp yarns.
  • the aforecited parts are shown in continuous lines in the position of weft yarn insertion, arid in dashed lines in the beating up position.
  • Fig. 1 also illustrates in dashed lines one of the guide elements for the gripper strap, in an intermediate position, and its trajectory between two end positions of the sley.
  • the weft gripper 1 is fixed onto the top flat surface of the strap 2 - which causes its motion along the shed - with its barycenter coinciding with that of the strap 2, or positioned below the same.
  • the strap 2 comprises on its bottom surface an undercut notch 3, which can have different shapes.
  • the undercut notch 3 is shown, respectively, with a rectangular section (fig. 3A), with a trapezoidal section (fig. 3B), and with an arched section (fig. 3C).
  • the undercut notch 3 can be formed along the entire length of the strap 2 which, in this case, will have the channel section 2A shown in fig. 4.
  • the notch 3 may be provided only in correspondence of the end portion of the strap 2, onto which the gripper 1 is mounted, in which case the remaining part of the strap will have the more simple rectangular section 2B shown in fig. 4.
  • the guide means for the strap 2 comprise a plurality of guide elements 4 apt to geometrically mate with the undercut notch 3 of said strap and thus having a shape strictly corresponding thereto.
  • the elements 4 are fixed by screw means 5 to supports 6 mounted on the sley C.
  • the gripper 1 is positioned - in respect of the strap 2 - so that its barycenter coincides with that of the strap 2, or is placed in an even lower position. Thanks to this arrangement, in spite of the gripper 1 moving at high speed, the strap 2 is not caused to deviate from its path by said gripper, making it unnecessary to provide for further engagement means (as normally provided in known technique) to guide the strap 2.
  • the strap 2 simply contacts the guide elements 4 with its lower surface only, the sides and the upper surfaces of the strap being free.
  • the arrangement according to the invention allows to notably limit the protrusion of the guide elements 4 into the warp lap, and to thereby reduce any consequent defects showing up in the fabric due to impacts between the warp yarns and said guide elements.
  • the limited protrusion of the guide elements into the warp lap is placed in evidence in fig. 1 by the trajectory TE of said elements, which shows how these totally move out of the shed greatly in advance in respect of the corresponding elements of prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

Claims (4)

  1. Moyen pour guider le mouvement de va-et-vient d'une paire de griffes de fils de trame le long de la foule de métiers à alimentation en trame continue, du type comprenant :
    deux bandes de commande (2) adaptées à se déplacer sur un plan sensiblement horizontal grâce à l'action de deux roues d'engrenage avec un mouvement alternatif, lesdites bandes (2) étant dotées d'une encoche évidée (3) sur leur surface inférieure au moins à leur extrémité supportant la griffe (1)
    et une pluralité d'éléments de guidage (4) montés sur le battant (C) du métier ;
       caractérisé en ce que :
       chaque bande contacte les éléments de guidage avec sa surface inférieure uniquement, les éléments de guidage (4) étant adaptés à épouser géométriquement ladite encoche évidée (3),
       et en ce que :
       la griffe (1) est montée sur la surface supérieure de la bande (2) et son barycentre coïncide avec le barycentre de la section de bande ou est situé en dessous.
  2. Moyen selon la revendication 1, dans lequel ladite encoche évidée (3) de la bande (2), et la partie desdits éléments de guidage (4) adaptée à épouser géométriquement l'encoche, ont une section rectangulaire.
  3. Moyen selon la revendication 1, dans lequel ladite encoche évidée (3) de la bande (2), et la partie desdits éléments de guidage (4) adaptée à épouser géométriquement l'encoche, ont une section trapézoïdale.
  4. Moyen selon la revendication 1, dans lequel ladite encoche évidée (3) de la bande (2), et la partie desdits éléments de guidage (4) adaptée à épouser géométriquement l'encoche, ont une section arquée.
EP95117867A 1994-11-30 1995-11-13 Moyen pour guider le mouvement d'une paire de griffes lelong de la foule de métiers à tisser Expired - Lifetime EP0715009B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI942426A IT1271130B (it) 1994-11-30 1994-11-30 Mezzi per guidare il moto di una coppia di pinze all'interno del passo di telai di tessitura
ITMI942426 1994-11-30

Publications (2)

Publication Number Publication Date
EP0715009A1 EP0715009A1 (fr) 1996-06-05
EP0715009B1 true EP0715009B1 (fr) 2000-02-09

Family

ID=11369937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117867A Expired - Lifetime EP0715009B1 (fr) 1994-11-30 1995-11-13 Moyen pour guider le mouvement d'une paire de griffes lelong de la foule de métiers à tisser

Country Status (5)

Country Link
EP (1) EP0715009B1 (fr)
AT (1) ATE189709T1 (fr)
DE (1) DE69514998T2 (fr)
ES (1) ES2144560T3 (fr)
IT (1) IT1271130B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1010943A3 (nl) * 1997-02-24 1999-03-02 Picanol Nv Grijperweefmachine met een aantal geleidingsmiddelen.
DE59914379D1 (de) * 1998-08-25 2007-07-26 Picanol Nv Greiferwebmaschine mit wenigstens einem greiferband und führungsmitteln
DE19838476A1 (de) 1998-08-25 2000-03-09 Picanol Nv Greiferbandwebmaschine mit wenigstens einem Greiferband und Führungsmitteln
BE1013013A3 (nl) * 1998-10-29 2001-07-03 Picanol Nv Grijperband voor een grijperweefmachine.
JP4595187B2 (ja) * 2000-10-12 2010-12-08 株式会社豊田自動織機 レピア織機における緯入れ装置
DE102004049256B4 (de) 2004-10-05 2014-01-02 Picanol Führungselemente für ein Greifertransportelement einer Webmaschine
CN107212648B (zh) * 2016-12-08 2019-07-09 温岭市兴庆机械设备有限公司 一种物品用的收藏架装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0623694A1 (fr) * 1993-05-05 1994-11-09 NUOVA VAMATEX S.p.A. Ruban à griffes pour métiers à tisser

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1198246B (it) * 1986-12-23 1988-12-21 Vamatex Spa Mezzi per guidare il moto di una coppia di pinze portatrama all'interno del passo di telai di tessitura
FR2648161B1 (fr) * 1989-06-09 1991-10-04 Saurer Diederichs Sa Dispositif de support et de guidage pour organes d'insertion mecanique de la trame, dans une machine a tisser sans navette
US5176185A (en) * 1990-07-24 1993-01-05 Sulzer Brothers Limited Guide teeth for a rapier picking tape

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0623694A1 (fr) * 1993-05-05 1994-11-09 NUOVA VAMATEX S.p.A. Ruban à griffes pour métiers à tisser

Also Published As

Publication number Publication date
EP0715009A1 (fr) 1996-06-05
DE69514998D1 (de) 2000-03-16
ITMI942426A1 (it) 1996-05-30
DE69514998T2 (de) 2000-06-15
ATE189709T1 (de) 2000-02-15
ITMI942426A0 (it) 1994-11-30
IT1271130B (it) 1997-05-26
ES2144560T3 (es) 2000-06-16

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