EP1803843A1 - Pince de sortie pour métiers à tisser à performance améliorée pour l'insertion de double duite - Google Patents

Pince de sortie pour métiers à tisser à performance améliorée pour l'insertion de double duite Download PDF

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Publication number
EP1803843A1
EP1803843A1 EP05425929A EP05425929A EP1803843A1 EP 1803843 A1 EP1803843 A1 EP 1803843A1 EP 05425929 A EP05425929 A EP 05425929A EP 05425929 A EP05425929 A EP 05425929A EP 1803843 A1 EP1803843 A1 EP 1803843A1
Authority
EP
European Patent Office
Prior art keywords
gripper
gripping
drawing gripper
hook
gripping device
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.)
Withdrawn
Application number
EP05425929A
Other languages
German (de)
English (en)
Inventor
Roberto Lebbolo
Silvano Testa
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
Priority to EP05425929A priority Critical patent/EP1803843A1/fr
Priority to CNA2006101446782A priority patent/CN1990922A/zh
Publication of EP1803843A1 publication Critical patent/EP1803843A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • the present invention refers to a drawing gripper for weaving looms specifically designed to achieve a steady grip of double weft threads, i.e. consisting of two individual weft yarns which are associated and introduced simultaneously in the shed formed of warp threads to manufacture special fabrics.
  • weft transportation across the shed is, as known, accomplished by a pair of cooperating grippers, called carrying gripper and drawing gripper, respectively, which are controlled in an alternate movement through the shed. More precisely, the path of the carrying gripper unfolds between the weft entry side and the middle of the shed, whereas the one of the drawing gripper unfolds, correspondingly, between the weft output side and the middle of the shed.
  • the weft thread is picked up within the gripping means by the gripper (carrying and drawing gripper, respectively) in a closed position, thanks to the combination of forces originating from the translation movement of the grippers and from the resistance imparted by the weft thread which is optimally taut on the path of the grippers.
  • weft exchange which occurs between the pair of carrying/drawing grippers in the middle of the shed; as a matter of fact, unlike the initial weft thread gripping operation by the carrying gripper, wherein the thread is stationary in a predetermined fixed position and especially free from any impediment, in the case of the weft exchange the weft thread is not only obviously moving, but it is also steadily retained by the gripping means of the carrying gripper.
  • the gripping of the weft thread by the drawing gripper must hence be sufficiently swift and stable, on both the yarns making up the double weft thread, so as to free the weft thread from the gripping means of the carrying gripper without causing harmful mutual sliding of the two yarns forming the same.
  • the double weft threads are used for the formation of fabrics having special technical or aesthetic features, such as for example those intended for soft furnishings or sportswear.
  • the two weft threads have remarkably different features, in particular as far as their count is concerned; the association between a bulky yarn apt to give the fabric particular aesthetic features and thin, high-resistance yarns which instead give the fabric the necessary stability from a mechanical point of view is common for example.
  • weft exchange operation between the carrying gripper and the drawing gripper is particularly critical when double weft threads are used.
  • the gripping device of the drawing gripper it is not infrequent for the gripping device of the drawing gripper to steadily tighten only the weft thread having the higher count, while the thinner weft thread is not suitably retained, so that the tension imparted to the two weft threads is different, causing weaving irregularities due to the partial mutual sliding of the two threads or even to the complete breakage of either of them.
  • a drawing gripper for weaving looms of the type wherein the weft thread gripping device consists of the coupling between a fixed surface formed in the inner part of the gripper hook and inclined with respect to the shifting direction of the gripper, and the mobile surface of a wedge carried on the front end of a longitudinal rod housed in the gripper and movable in an axial direction with respect thereto, said rod being driven in an open position of the gripping device, in contrast with spring means provided on the gripper, by lever means cooperating with fixed outer abutments arranged on the loom, characterised in that it further comprises a flexible metal plate arranged, with a free front portion thereof, in contact with the upper edge of at least one of the cooperating surfaces of said gripping device, and apt to impart an elastic pressure force thereon.
  • the drawing gripper comprises, in a manner well-known per se to people skilled in the field, a gripper body 1 ending at the front in a tip 2.
  • a hook 3 is attached integrally therewith having a planar gripping surface 4 facing the inside of the gripper.
  • Surface 4 lies on a plane which, in the illustrated embodiment, is substantially vertical and moderately inclined with respect to the longitudinal axis of the gripper, for example by an angle comprised between 15° and 30°.
  • the inner surface 4 of hook 3 represents, in known-type drawing grippers, one of the two elements of the weft thread gripping device, the other element consisting of a wedge 5, equipped with a movable gripping surface 6 facing hook 3, and of an opposite surface resting on gripper body 1.
  • Wedge 5 is carried on the front end of a rod 7 movable in a longitudinal direction along gripper body 1, the movement whereof is caused in one direction by spring means (not shown) which elastically push rod 7 towards gripper tip 2 and, in the opposite direction, by a lever (not shown) having its fulcrum on gripper body 1 and apt to cooperate with fixed outer abutments arranged on the loom.
  • the control lever of rod 7 When the drawing gripper lies within the shed, the control lever of rod 7 is not operated and the spring means thereby constantly keep gripping surface 6 of wedge 5 in contact with the corresponding gripping surface 4 of hook 3, while the opposite wedge resting surface abuts against the inner wall of gripper body 1, the tightening force between gripping surfaces 4 and 6 being able to be set at will by varying features and preload of the spring means.
  • the control lever of rod 7 is operated by the fixed abutment means on the loom, by moving the rod in contrast with the action of the above-said spring means and thereby opening the gripping device of the gripper.
  • the gripping surface 6 of wedge 5 also consists of a plane surface arranged according to a vertical plane, however having an inclination angle to the longitudinal axis of the gripper slightly smaller than that of surface 4. Thereby, the two surfaces come into contact only in the front area thereof leaving an empty channel having a width increasing towards the rear part of the gripper, which channel the weft thread enters upon exchange with the carrying gripper.
  • hook 3 and wedge 5 preferably have their upper surfaces formed so as to lie on a single, substantially horizontal plane, whereon the free front portion of plate 8 hence rests.
  • the intensity of the elastic retaining action played by flexible plate 8 can be predetermined at will according to the material, form and thickness features of the same plate, as well as to the corresponding attachment system, according to different possible ways, all well-known to people skilled in the field and hence included in the scope of the present invention.
  • One of the various possible embodiments of flexible plate 8 is shown in the drawings and will be described in the following.
  • plate 8 comprises, in addition to operative front portion 8p already described above, lying in a substantially horizontal position, a vertical rear portion 8f laterally adjacent to rod 7 and fastened to the same by means of a screw 9.
  • plate 8 On the opposite side of screw 9, with respect to portion 8p, plate 8 finally has a short extension 8t, perpendicular to portion 8f and preferably lying in the same plane as portion 8p, said portion 8t having a thickness and a length such as to lie in contact with the upper side of rod 7 along the entire width thereof.
  • the desired preload level of operative portion 8b of plate 8, i.e. the elastic force imparted thereby on the plane formed by hook 3 and by wedge 5, is determined by the geometric conformation of the plate and, in particular, by the thickness and by the free length of portion 8p.
  • the front end of plate 8 has a characteristic, asymmetric fork-shape, clearly visible in figs. 2 and 4, comprising a longer inner prong 10 and a shorter outer prong 11.
  • Prong 10 hence extends mainly above wedge 5 and on the front part of the edge of hook 3, up to near sliding groove 12 of the weft thread, while prong 11 extends instead mainly on the central portion of the upper surface of hook 3.
  • the two prongs 10 and 11 are finally mutually connected so as to form a slight depression or concavity 13, the edge joining said depression to the tip of prong 10 being substantially parallel to the underlying gripping channel.
  • This particular shape of the front end of plate 8 has been designed to guarantee the maintenance of a secure gripping of the weft thread also in the particular dynamic conditions in which the weft exchange takes place.
  • the double weft thread - taut within the carrying gripper - is captured by hook 3 and led into the gripping channel formed between the opposing gripping surfaces 4 and 6, as already said above.
  • the weft thread - still retained by the gripping means of the carrying gripper - slides along the outer edge of prong 11, overcoming the tip thereof, until it places itself in correspondence of depression 13.
  • the drawing gripper then undergoes a fast acceleration beginning the return path to its starting position outside the shed, and it is precisely in this step that the particular asymmetric fork-shape of the end of plate 8 plays its role.
  • the sharp acceleration of the gripper may cause a whip-effect on the weft thread which is projected in the direction of advancement of the gripper, overcoming the gripper and originating loops.
  • the weft thread hence momentarily undergoes a force facing the output direction of the gripping channel, which force can hence cause the disengagement of the one weft thread, between the two, which is retained only or mainly by the action of plate 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP05425929A 2005-12-28 2005-12-28 Pince de sortie pour métiers à tisser à performance améliorée pour l'insertion de double duite Withdrawn EP1803843A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05425929A EP1803843A1 (fr) 2005-12-28 2005-12-28 Pince de sortie pour métiers à tisser à performance améliorée pour l'insertion de double duite
CNA2006101446782A CN1990922A (zh) 2005-12-28 2006-11-14 双纬纱输送性能改进的用于织机的接纬剑杆头

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425929A EP1803843A1 (fr) 2005-12-28 2005-12-28 Pince de sortie pour métiers à tisser à performance améliorée pour l'insertion de double duite

Publications (1)

Publication Number Publication Date
EP1803843A1 true EP1803843A1 (fr) 2007-07-04

Family

ID=37027918

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425929A Withdrawn EP1803843A1 (fr) 2005-12-28 2005-12-28 Pince de sortie pour métiers à tisser à performance améliorée pour l'insertion de double duite

Country Status (2)

Country Link
EP (1) EP1803843A1 (fr)
CN (1) CN1990922A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102851846A (zh) * 2012-08-29 2013-01-02 铜陵艾纶纺织品有限责任公司 一种用于剑杆织机的接纬剑
US8656962B2 (en) 2009-08-11 2014-02-25 Lindauer Dornier Gesellschaft Mbh Gripper head of a weaving machine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010142264A1 (fr) * 2009-06-10 2010-12-16 Lindauer Dornier Gesellschaft Mbh Dispositif et procédé d'insertion des fils de trame dans une machine à tisser à pinces
CN108728991B (zh) * 2018-07-18 2024-02-06 常州市悦腾机械有限公司 多层织机接纬器
CN110629366B (zh) * 2019-10-10 2020-12-22 海宁市经之纬家纺织造有限公司 双线式纺织纬线织布装置
CN110760979A (zh) * 2019-12-02 2020-02-07 朱惠忠 一种用于纬纱束编织的剑杆织机及其操作方法
CN113293485B (zh) * 2021-05-26 2022-09-16 绍兴市嘉纬电子科技有限公司 一种高速耐磨型纺织剑头
CN113737361B (zh) * 2021-07-26 2022-09-16 山东艺成复合材料有限公司 一种隔离型剑头剑杆织机及其使用方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2214774A1 (fr) * 1973-01-22 1974-08-19 Saurer Diederichs Sa
US4226265A (en) * 1978-02-28 1980-10-07 Ruti Machinery Works Ltd. Withdrawing carrier for looms with removal of the filling thread from stationary bobbins
US4417606A (en) * 1980-09-15 1983-11-29 Nuovo Pignone S.P.A. Weft propelling grippers for textile looms
EP0571025A1 (fr) 1992-05-22 1993-11-24 NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. Griffe de prise utilisable dans un métier à tisser
EP0576074A1 (fr) * 1992-06-23 1993-12-29 NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. Pince de sortier pour métiers à tisser
EP0695820A1 (fr) * 1994-08-05 1996-02-07 NUOVO PIGNONE S.p.A. Système de blocage/accrochage pour la fin de fil dans la pince d'amenée d'un métier à tisser
EP0822279A1 (fr) * 1996-07-31 1998-02-04 NUOVA VAMATEX S.p.A. Pince de sortie pour métiers à tisser

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2214774A1 (fr) * 1973-01-22 1974-08-19 Saurer Diederichs Sa
US4226265A (en) * 1978-02-28 1980-10-07 Ruti Machinery Works Ltd. Withdrawing carrier for looms with removal of the filling thread from stationary bobbins
US4417606A (en) * 1980-09-15 1983-11-29 Nuovo Pignone S.P.A. Weft propelling grippers for textile looms
EP0571025A1 (fr) 1992-05-22 1993-11-24 NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. Griffe de prise utilisable dans un métier à tisser
EP0576074A1 (fr) * 1992-06-23 1993-12-29 NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. Pince de sortier pour métiers à tisser
EP0695820A1 (fr) * 1994-08-05 1996-02-07 NUOVO PIGNONE S.p.A. Système de blocage/accrochage pour la fin de fil dans la pince d'amenée d'un métier à tisser
EP0822279A1 (fr) * 1996-07-31 1998-02-04 NUOVA VAMATEX S.p.A. Pince de sortie pour métiers à tisser

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8656962B2 (en) 2009-08-11 2014-02-25 Lindauer Dornier Gesellschaft Mbh Gripper head of a weaving machine
CN102851846A (zh) * 2012-08-29 2013-01-02 铜陵艾纶纺织品有限责任公司 一种用于剑杆织机的接纬剑

Also Published As

Publication number Publication date
CN1990922A (zh) 2007-07-04

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