EP0822279B1 - Drawing gripper for weaving looms - Google Patents

Drawing gripper for weaving looms Download PDF

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Publication number
EP0822279B1
EP0822279B1 EP97111753A EP97111753A EP0822279B1 EP 0822279 B1 EP0822279 B1 EP 0822279B1 EP 97111753 A EP97111753 A EP 97111753A EP 97111753 A EP97111753 A EP 97111753A EP 0822279 B1 EP0822279 B1 EP 0822279B1
Authority
EP
European Patent Office
Prior art keywords
hook
gripper
slider
wedge
bar
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
EP97111753A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0822279A1 (en
Inventor
Giuseppe Casarotto
Roberto Ruggeri
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
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Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP0822279A1 publication Critical patent/EP0822279A1/en
Application granted granted Critical
Publication of EP0822279B1 publication Critical patent/EP0822279B1/en
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
    • D03D47/12—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 weft yarn drawing gripper for shuttleless looms of the above mentioned type.
  • the invention concerns improvements in a drawing gripper, as the one described and illustrated in the Italian patent N° 21291 A/84 in the name of the Applicant, with the object to increase weft yarn gripping efficiency and to thus reduce, on one hand, the risk that the weft yarn may slip out of the drawing gripper during transport at the high speed of modern looms, and guarantee, on the other hand, a correct and safe release of the weft yarn at the end of its path.
  • drawing grippers comprise elements to grip and block the weft yarn which - as can be seen from figs. 1 and 2 - consist of a wedge-shaped slider 1 movable lengthwise to the gripper inside a hook 2 lying on a horizontal plane at the starting end of the drawing gripper.
  • the wedge-shaped slider 1 has a flat surface 1A bearing in a guiding position onto a shank 2A of the hook 2, and a blocking surface 1B inclined in respect of the previous one and designed to cooperate with a corresponding surface 2C of the end 2B of the hook.
  • elastic means (not shown) are provided to keep said slider elastically pressed inside said hook 2, so that blocking of the weft yarn can be released by acting onto the wedge-shaped slider in opposition to the elastic means.
  • the hook 2 and the slider 1 are shaped so that their reciprocally facing surfaces 1B and 2C, cooperating to block the weft yarn, may substantially form a tight dihedral 3.
  • the weft yarn inserts itself into the dihedral 3, remaining blocked therein because of the tension to which it is subjected, and it is released upon parting of the two surfaces of said dihedral, obtained by known means as those described in the Italian patents N. 21291 A/84 and 22229 A/87 in the name of the Applicant.
  • the direction in which the tension T acts on the yarn should be close to the bisectrix of the dihedral 3, so as to favour the insertion of the yarn itself.
  • the smaller the angle ⁇ (fig. 1) between the bisectrix of the dihedral and the direction in which the tension acts on the yarn the stronger the effect of weft yarn "clamping" into the hook 2.
  • the wedge of the slider is very acute-angled, that is, the inclined surface 1B of the wedge shows a trend close to the moving forward direction of the slider. Favourably, with this configuration, the friction angles prevent a spontaneous opening of the hook-wedge dihedral.
  • the size of the angle ⁇ in the solutions proposed by known technique always constitutes a compromise between an efficient closing. with a proper insertion of the weft yarn in the hook, and a prompt and reliable opening in the phase of yarn release.
  • GB-A-2106550 and EP-A-504.899 disclose a weft transfer device comprising a hook within which a wedge element is axially movable, a spring element being fixed to said wedge element forming a resilient end of the wedge element apt to clamp a weft yarn inside said hook.
  • the object of the present invention is to overcome the problems arising between different requirements, by supplying a drawing gripper which has a very narrow angle ⁇ between the bisectrix of the dihedral - formed by the hook and the wedge-shaped slider - and the weft yarn weaving direction and, at the same time, a parting movement of the opposite cooperating surfaces 2C and 1B of hook and slider, along a direction close to normal of these surfaces.
  • a drawing gripper for weaving looms consisting of a gripper body, a hook positioned at one end of said body and a movable slider housed into said body and moving lenghtwise towards the hook - which also comprises a wedging-in bar projecting from said gripper body and having an end fixed thereto, the other free end of said bar being positioned between the slider and one side of the end of said hook, against which it is pressed by said slider, the weft yarn being inserted and tightened between said free end of the bar and said side of the hook end.
  • the drawing gripper according to the present invention is completely different from the grippers of known technique, because - as well as being formed of a gripper body 10, of a wedge-shaped slider 11 sliding in the body 10, and of a hook 12 shaped at the leading end of the gripper body - it also comprises a flexible wedging-in bar or metal strap 17 (fig. 3).
  • the wedging-in strap 17 is fixed with one end to the gripper body 10, through a screw 14 close to the base of the hook 2, while its other leading end E is free and is placed between the wedge-shaped slider 11 and the end 12B of the hook 12.
  • the outer surface of the strap 17 engages with the side 15 of the end part 12B of the hook 12, while the inner surface of the strap 17, in proximity to its free leading end E, shows a swelling of suitable shape for cooperating with the wedge-shaped slider 11.
  • this is obtained by using a suitably profiled strap made of flexible material, for instance harmonic steel.
  • the weft yarn 16 is thus clamped - rather than between the wedge-shaped slider 11 and the surface of the side 15 of the hook 12, as in known technique - between the surface of the side 15 and the strap 17.
  • the leading end E is wedge-shaped and is apt to cooperate with the wedge-shaped slider 11 in the manner of two conjugate surfaces which form, with the moving forward direction of the wedge-shaped slider 11, a wide angle ⁇ .
  • the drawing gripper according to the invention one is able to obtain, as wished, a wide angle ⁇ which ensures a broad movement of the leading end E, also for a limited stroke of the wedge-shaped slider 11, which movement turns into a wide and prompt opening of the hook 12.
  • the strap 17 moves away from the end 12B of the hook 12 along a direction which, in view of the movement of said strap due to its flexibility, is substantially perpendicular to the surface of the side 15.
  • the drawing gripper inserts itself into the shed in a closed condition, with the wedge-shaped slider 11 pressed against the leading end E of the strap 17 by elastic check means (not shown).
  • the starting end of the yarn 16 inserts itself into the V-shaped dihedral 13, fitting between the outer surface of the strap 17 and the side 15 of the end 12B of the hook 12.
  • the insertion and blocking of the weft yarn into the dihedral 13 are facilitated and favoured by the low width of the angle ⁇ and by the fact that the yarn tension T, being the angle ⁇ narrow, is almost totally discharged onto the direct component as the bisectrix F.
  • the drawing gripper then continues its stroke, drawing the weft yarn 16 therewith up to when, moving out of the shed, a known-type opening mechanism acts on the wedge-shaped slider 11 withdrawing it in the direction of the gripper body 10, which gripper is thus opened.
  • the reciprocally coupled surfaces of the hook end 12B, of the wedge-shaped slider 11 and of the strap 17, can be differently shaped so as to obtain the most appropriate motion laws.
  • the inclined surfaces may be positioned according to different solutions, as for instance:
  • the drawing gripper shown in fig. 4A in an open position and in fig. 4B in a closed position represents another embodiment of the invention, corresponding to the solution of point b) hereabove.
  • the wedge-shaped slider 11 cooperates with an inclined surface 18 of the hook shank 12A, while the free end of the strap 17 is simply thicker in respect of the remaining flexible portion thereof.
  • the working of the drawing gripper according to this embodiment is fully similar to that of the gripper described further above.
  • the wedge-shaped slider having to act against the inclined surface 18 which is fixed, must have two degrees of freedom allowing it to perform a movement which consists of a translation X, along the longitudinal axis of the gripper, and of a displacement in the orthogonal direction Y, determined by the inclination of the inclined surface 18.
  • the angle ⁇ may be chosen as narrow as required, while the angle ⁇ of the inclined surface 18 will be sufficiently wide to ensure a prompt and efficient opening.
  • a further advantage deriving from the use of a gripper as described above, is that the surface of the side 15 of the hook end 12B and the outer surface of the strap 17 can be saw-toothed, since the reciprocal parting substantially takes place orthogonally to said surfaces, whereby there is no risk of the weft yarn getting caught between the opposite teeth of the saw-toothed surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Woven Fabrics (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
  • Sewing Machines And Sewing (AREA)
EP97111753A 1996-07-31 1997-07-10 Drawing gripper for weaving looms Expired - Lifetime EP0822279B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI961648 1996-07-31
IT96MI001648A IT1283380B1 (it) 1996-07-31 1996-07-31 Pinza traente per telai di tessitura.

Publications (2)

Publication Number Publication Date
EP0822279A1 EP0822279A1 (en) 1998-02-04
EP0822279B1 true EP0822279B1 (en) 2001-10-31

Family

ID=11374728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111753A Expired - Lifetime EP0822279B1 (en) 1996-07-31 1997-07-10 Drawing gripper for weaving looms

Country Status (5)

Country Link
EP (1) EP0822279B1 (it)
AT (1) ATE207983T1 (it)
DE (1) DE69707778T2 (it)
ES (1) ES2166030T3 (it)
IT (1) IT1283380B1 (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH692457A5 (it) * 1997-07-29 2002-06-28 Gividi Italia Spa Pinza traente per telai a tessere a lance ed impiego della pinza.
EP1803843A1 (en) * 2005-12-28 2007-07-04 Promatech S.p.A. Drawing gripper for weaving looms with improved performance for the transport of double weft yarns

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1132844B (it) * 1980-09-15 1986-07-09 Nuovo Pignone Spa Perfezionamenti nelle pinze passatrama per telai tessili
BE902141A (nl) * 1985-04-09 1985-10-09 Picanol Nv Verbeterde grijpers voor weefmachines.
CH669220A5 (de) * 1986-02-13 1989-02-28 Sulzer Ag Greifer fuer den schussfadeneintrag bei einer greiferwebmaschine.
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
IT1261319B (it) * 1993-10-27 1996-05-14 Interpatents Ltd Pinza portatrama per macchine per tessere.

Also Published As

Publication number Publication date
ES2166030T3 (es) 2002-04-01
DE69707778D1 (de) 2001-12-06
ATE207983T1 (de) 2001-11-15
EP0822279A1 (en) 1998-02-04
IT1283380B1 (it) 1998-04-17
DE69707778T2 (de) 2003-01-23
ITMI961648A0 (it) 1996-07-31
ITMI961648A1 (it) 1998-01-31

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