EP1256644A1 - Griffe d'amenée pour métiers à tisser ajustable en fonction du titrage du fil de trame - Google Patents

Griffe d'amenée pour métiers à tisser ajustable en fonction du titrage du fil de trame Download PDF

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Publication number
EP1256644A1
EP1256644A1 EP01830296A EP01830296A EP1256644A1 EP 1256644 A1 EP1256644 A1 EP 1256644A1 EP 01830296 A EP01830296 A EP 01830296A EP 01830296 A EP01830296 A EP 01830296A EP 1256644 A1 EP1256644 A1 EP 1256644A1
Authority
EP
European Patent Office
Prior art keywords
gripper
weft yarn
slit
movable element
upper movable
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.)
Granted
Application number
EP01830296A
Other languages
German (de)
English (en)
Other versions
EP1256644B1 (fr
Inventor
Roberto Lebbolo
Silvana 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 EP01830296A priority Critical patent/EP1256644B1/fr
Priority to DE60138999T priority patent/DE60138999D1/de
Priority to ES01830296T priority patent/ES2328665T3/es
Priority to AT01830296T priority patent/ATE434068T1/de
Publication of EP1256644A1 publication Critical patent/EP1256644A1/fr
Application granted granted Critical
Publication of EP1256644B1 publication Critical patent/EP1256644B1/fr
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

Definitions

  • the present invention concerns a weft yarn carrying gripper for weaving looms and, in particular, a carrying gripper wherein the weft yarn gripping members can be adjusted according to the thickness of the weft yarn used for each weaving operation.
  • a conventional weft yarn carrying gripper for looms comprises a fairly wide body, extending frontwise into a narrower portion ending with a tip.
  • the tip is in fact meant to penetrate under the weft yarn being fed each time in front of the gripper by a weft presenting device, so as to cause said yarn to slide along the top surface of the gripper with a suitable tension until it is gripped by its gripping members.
  • the gripper body is separated from the tip portion thereof by a slit, which is oblique in respect of the motion direction of the gripper and into which the weft yarn inserts itself due to its tension and to the gripper motion; into said slit there are arranged the gripping members, apt to temporarily stop the weft yarn, at least until the exchange of the same with the weft yarn drawing gripper.
  • the width of said slit is proportional to the thickness of the weft yarn; in fact, an exceedingly narrow slit would obviously hamper the insertion of the weft yarn, but even an excessively wide slit could create problems in that it would allow a certain degree of freedom to the weft yarn, causing its unsteadiness and thereby determining an unreliable and unrepeatable insertion thereof into the gripper slit.
  • each loom would have to be provided with a local store containing every possible replacement gripper, with the obvious consequence, not only of an increased bulk, but also of an inefficient optimization in handling the replacement grippers which, forming part of the equipment of each single loom, would have to be supplied in a far higher number than that actually required for the whole weaving compartment.
  • the object of the present invention is to thus supply a solution apt to overcome the above drawbacks, namely to allow carrying out the weaving operations with grippers having a slit of width always corresponding to the thickness of the weft yarn being used each time, but with no need to dispose of a plurality of grippers to alternate on the loom.
  • said object is reached by supplying an adjustable weft yarn carrying gripper, in which the dimensions of the slit for weft yarn insertion can be modified within a preset range through an easy and fast operation.
  • a weft yarn carrying gripper for weaving looms of the type comprising a gripper body having a wide bearing surface for the warp yarns and a narrower tip portion separated from the gripper body by a slit for weft yarn insertion, is characterized in that at least the portion of said warp yarns bearing surface delimiting said slit is formed by an upper movable element fixed to the gripper body by adjustable fixing means, so as to allow adjusting the width of said slit.
  • a conventional weft yarn carrying gripper can be functionally subdivided into a body 1 and a tip portion 2, as shown in Fig. 1 and Fig. 3 in relation to the gripper body according to the present invention.
  • the gripper body 1 essentially consists - in known manner - of an elongated bottom element 3, meant to be fixed to the gripper carrying strap, and of a wide flat top surface 4 onto which bear the warp yarns during the initial/final step of inlet/outlet of the gripper into and out of the shed.
  • the members to grip the weft yarn T are only diagrammatically illustrated in fig. 2, since they are by no means involved in the present invention.
  • the tip portion 2 of the gripper is less wide than the gripper body 1 and is separated therefrom by an oblique slit 5 allowing to insert into the gripper the weft yarn T.
  • the tip portion 2 is less high than the body 1 and is radiused to said body in a smoothly inclined manner, so as to form a beveling in correspondence of the slit 5, apt to steadily hold the weft yarn T and facilitate its correct insertion into the gripper.
  • the invention proposes to use a single gripper in which said width can be easily adjusted, instead of adopting different grippers each having a slit of preset fixed width, as done in previous technique.
  • said result is obtained by forming at least part of the gripper top surface 4 - namely, at least said portion which delimits the slit 5 - as a movable upper element 6, fixed to the gripper body by adjustable fixing means and slidable on an underlying sliding plane, formed into the gripper body 1 and apt to supply a steady support for the upper element 6 in any position thereof.
  • the upper element 6 lies on the same plane and is perfectly aligned with the remaining fixed part of the surface 4, so that the ensemble formed by the fixed part of the surface 4 and the movable surface of the upper element 6 appears as a single continuous bearing surface for the warp yarns, independently from the position taken up each time by the upper element 6 in order to adjust the width of the slit 5.
  • the line of separation between the fixed surface 4 and the upper element 6 is a line parallel to the longitudinal axis of the gripper
  • the adjustable fixing means consist of screws 7 of small diameter (for example M2 screws) which screw into corresponding threaded seats, provided in the gripper body 1, by crossing slots 8 (figs. 4 and 5) formed into suitable ears 9 projecting perpendicularly from the upper element 6.
  • the ears 9, and thus the slots 8 and the screws 7, are positioned in the bottom part of the upper element 6 and are hence perfectly “hidden” either by said upper element 6 or by the surface 4, so that the screws 7, though being within easy reach for adjustment from a lateral position, are never apt to interfere with the warp yarns during the gripper motion.
  • the width of the slots 8 determines the possible travel of the upper element 6 between an advanced position, in which the slit 5 has the minimum width, and a setback position in which said slit 5 has a maximum width, the upper element 6 always keeping - in any of the possible positions taken up during its travel - perfectly adjacent to the fixed surface 4. To make sure that the union between these two surfaces is perfectly even, the upper element 6 ends, on the side of the surface 4, with a toothed longitudinal rib 10 apt to engage with a conjugate rib provided in the surface 4.
  • the adjustment of the width of the slit 5 is very simple, as besides clearly results from the above description. It is in fact sufficient to loosen the two screws 7, to cause the upper element 6 to slide forward or backward up to obtaining the required width of the slit 5 - eventually using graduated shims to insert into said slit - and to then tighten again the screws 7 in the new position taken up by the upper element 6.
  • the entire operation of adjustment can be carried out in a few seconds, namely in positively shorter times than those currently required for the replacement of the whole gripper.
  • said gripper allows to obtain an easy and fast adjustment of the width of the slit 5 for weft yarn insertion, whereby it fully eliminates the need to store a series of grippers having slits 5 of different width; it moreover drastically reduces the times required to adapt the loom to the weaving operations with weft yarns of different thicknesses, and it allows to optimize - from the economical point of view, as well as for what concerns the supply of spare parts - the management of the grippers in the weaving compartment.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP01830296A 2001-05-08 2001-05-08 Griffe d'amenée pour métiers à tisser ajustable en fonction du titrage du fil de trame Expired - Lifetime EP1256644B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP01830296A EP1256644B1 (fr) 2001-05-08 2001-05-08 Griffe d'amenée pour métiers à tisser ajustable en fonction du titrage du fil de trame
DE60138999T DE60138999D1 (de) 2001-05-08 2001-05-08 Mit Bezug auf die Schussfadendicke einstellbarer Bringergreifer für Webmaschinen
ES01830296T ES2328665T3 (es) 2001-05-08 2001-05-08 Pinza portadora de trama para telares de tejeduria ajustable respecto del grosor del hilo de trama.
AT01830296T ATE434068T1 (de) 2001-05-08 2001-05-08 Mit bezug auf die schussfadendicke einstellbarer bringergreifer für webmaschinen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01830296A EP1256644B1 (fr) 2001-05-08 2001-05-08 Griffe d'amenée pour métiers à tisser ajustable en fonction du titrage du fil de trame

Publications (2)

Publication Number Publication Date
EP1256644A1 true EP1256644A1 (fr) 2002-11-13
EP1256644B1 EP1256644B1 (fr) 2009-06-17

Family

ID=8184512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01830296A Expired - Lifetime EP1256644B1 (fr) 2001-05-08 2001-05-08 Griffe d'amenée pour métiers à tisser ajustable en fonction du titrage du fil de trame

Country Status (4)

Country Link
EP (1) EP1256644B1 (fr)
AT (1) ATE434068T1 (fr)
DE (1) DE60138999D1 (fr)
ES (1) ES2328665T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1467009A2 (fr) * 2003-04-10 2004-10-13 Promatech S.p.A. Pince compacte pour métiers à tisser
EP1724383A1 (fr) * 2005-05-17 2006-11-22 Promatech S.p.A. Griffe porteuse pour métiers à tisser avec dispositif (anti-boucle) pour éviter le saisissement anticipé du fils de trame

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2278815A1 (fr) * 1974-07-18 1976-02-13 Etcoma Sarl Passe-trame amenee a couvercle basculant
EP0065233A1 (fr) * 1981-05-15 1982-11-24 VAMATEX S.p.A. Pince d'insertion pour métiers à tisser
EP0164034A2 (fr) * 1984-06-07 1985-12-11 VAMATEX S.p.A. Aiguille passe-trame pour métier à tisser sans navette
EP0509255A1 (fr) * 1991-03-22 1992-10-21 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Griffe porteuse pour métiers sans navette
WO1999029944A1 (fr) * 1997-12-11 1999-06-17 Picanol N.V. Griffe pour metier mecanique
EP1013806A1 (fr) * 1998-12-23 2000-06-28 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Paire d'aiguilles passe-trame pour métier à tisser

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2278815A1 (fr) * 1974-07-18 1976-02-13 Etcoma Sarl Passe-trame amenee a couvercle basculant
EP0065233A1 (fr) * 1981-05-15 1982-11-24 VAMATEX S.p.A. Pince d'insertion pour métiers à tisser
EP0164034A2 (fr) * 1984-06-07 1985-12-11 VAMATEX S.p.A. Aiguille passe-trame pour métier à tisser sans navette
EP0509255A1 (fr) * 1991-03-22 1992-10-21 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Griffe porteuse pour métiers sans navette
WO1999029944A1 (fr) * 1997-12-11 1999-06-17 Picanol N.V. Griffe pour metier mecanique
EP1013806A1 (fr) * 1998-12-23 2000-06-28 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Paire d'aiguilles passe-trame pour métier à tisser

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1467009A2 (fr) * 2003-04-10 2004-10-13 Promatech S.p.A. Pince compacte pour métiers à tisser
EP1467009A3 (fr) * 2003-04-10 2005-02-02 Promatech S.p.A. Pince compacte pour métiers à tisser
EP1724383A1 (fr) * 2005-05-17 2006-11-22 Promatech S.p.A. Griffe porteuse pour métiers à tisser avec dispositif (anti-boucle) pour éviter le saisissement anticipé du fils de trame
CN1865562B (zh) * 2005-05-17 2010-09-29 普洛玛技术股份公司 用于织机的带有防止环形成装置的运载夹纱器

Also Published As

Publication number Publication date
EP1256644B1 (fr) 2009-06-17
ES2328665T3 (es) 2009-11-17
DE60138999D1 (de) 2009-07-30
ATE434068T1 (de) 2009-07-15

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