EP1724383B1 - Griffe porteuse pour métiers à tisser avec dispositif (anti-boucle) pour éviter le saisissement anticipé du fils de trame - Google Patents

Griffe porteuse pour métiers à tisser avec dispositif (anti-boucle) pour éviter le saisissement anticipé du fils de trame Download PDF

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Publication number
EP1724383B1
EP1724383B1 EP05425330A EP05425330A EP1724383B1 EP 1724383 B1 EP1724383 B1 EP 1724383B1 EP 05425330 A EP05425330 A EP 05425330A EP 05425330 A EP05425330 A EP 05425330A EP 1724383 B1 EP1724383 B1 EP 1724383B1
Authority
EP
European Patent Office
Prior art keywords
gripper
weft thread
deflector
weft
gripping means
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.)
Active
Application number
EP05425330A
Other languages
German (de)
English (en)
Other versions
EP1724383A1 (fr
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
Priority to ES05425330T priority Critical patent/ES2318443T3/es
Application filed by Promatech SpA filed Critical Promatech SpA
Priority to DE602005012062T priority patent/DE602005012062D1/de
Priority to AT05425330T priority patent/ATE419416T1/de
Priority to EP05425330A priority patent/EP1724383B1/fr
Priority to US11/345,377 priority patent/US20060260709A1/en
Priority to TW095105654A priority patent/TWI350864B/zh
Priority to CN2006100682561A priority patent/CN1865562B/zh
Priority to KR1020060043622A priority patent/KR20060119770A/ko
Publication of EP1724383A1 publication Critical patent/EP1724383A1/fr
Application granted granted Critical
Publication of EP1724383B1 publication Critical patent/EP1724383B1/fr
Active legal-status Critical Current
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
    • 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
    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means

Definitions

  • the present invention refers to a carrying gripper for weaving looms, and particularly to a gripper of this type equipped with a device to avoid anticipated gripping of the weft.
  • weft thread As is well known to people skilled in the field, during weaving of the weft thread (or of the different weft threads, in the case of weaving with wefts of a different type or colour), after the weft thread is inserted and beaten by the reed against the fabric, said weft thread is not cut off from the same fabric, but remains joined thereto until such thread is again selected by the weaving machine for a new insertion.
  • weft thread is then stretched - between the point where it is joined to the fabric (with the possible presence of a deflector if the weft threads to be woven are many and hence some wefts remain inactive for many successive loom strokes) and the corresponding weft feeder - according to an oblique line which crosses the insertion path of the carrying gripper, in order to be gripped by said gripper and then conveyed through the shed.
  • a cutting device intervenes which cuts off the weft thread end still joined to the fabric, thereby allowing correct insertion of such thread into the shed.
  • the exact instant when weft thread cutting is performed must therefore be adjusted with extreme precision; as a matter of fact, it is necessary for the cut to occur at the exact time when the weft thread has been gripped enough by the elastic gripping means of the carrying gripper so as to prevent it from slipping off the gripper in the first half of the shed, but not so much as to impair weft exchange with the drawing gripper in the middle of the shed.
  • the Applicant could finally ascertain that one of the main causes determining the gripping defects discussed above consists in the occasional irregular pattern of the weft thread in the cutting area.
  • the weft thread portion between the gripper and the fabric - i.e. precisely the portion wherein weft thread cutting later occurs before insertion of said thread into the shed - upon contact with the gripper does not always stay well taut along the oblique line as it had originally arranged itself, particularly when the weft is thin, but it is subject to the formation of randomly shaped and positioned loops.
  • gripping if cutting occurs before the desired time, gripping has an insufficient retention strength and the weft thread may be lost by the carrying gripper before such gripper arrives at the weft exchange area. If, on the contrary, cutting occurs after the theoretically-calculated ideal instant, gripping carries on with excessive wedging of the weft thread, so as to determine a thread retention strength which exceeds its own tensile strength and hence its breakage at the time of exchange with the drawing gripper.
  • Another object of the present invention is to provide a gripper of the above-mentioned type, which allows to handle simultaneously both thin and thicker wefts, thereby eliminating the need to change gripper upon variation of the woven item and also allowing the weaving of items having varying wefts.
  • a carrying gripper for weaving looms of the type wherein behind the gripper tip head a channel is formed for weft thread insertion into an inner area of the gripper and towards the elastic weft gripping means, said channel lying on a substantially vertical plane parallel to the direction of the waiting weft threads, the inlet of said elastic gripping means being arranged on the bottom of said channel and immediately downstream thereof, characterised in that it further comprises a weft thread deflector arranged sideways of said inlet of the elastic gripping means and on the opposite side in respect of the weft thread end joined to the fabric being woven, said deflector being apt to delay weft thread entry into said gripping means.
  • the weft thread deflector which makes up the anti-loop device of the present invention has been advantageously associated with a mobile device defining the back wall of the weft thread entry channel, which device was previously developed by the same Applicant ( EP-A-1256644 ).
  • Such device has various functions, in addition to that of forming the weft thread entry channel, and particularly of allowing channel width adjustment so as to allow to use the same gripper with threads having a different count; to hinder the further sliding of the weft thread on the back of the gripper, at the end of the sliding action on the gripper tip head, thereby preventing any problem of missed weft thread gripping inside the gripper; and finally of reducing the risk of warp yarns becoming entangled on the body of the gripper when sliding on the gripper back.
  • the structure of such device will be briefly recalled in the following to facilitate understanding of the later description of the anti-loop device which is the subject of the invention.
  • the known device defining the back wall of the weft thread entry channel is clearly illustrated in the drawings and particularly in figs. 2 and 3 . It consists of an elongated metallic element 1, fitted to a side wall of the gripper body by screws 2 which cooperate with eyelets 3 formed on a rear portion 1p of element 1, substantially planar and parallel to the longitudinal axis of the gripper.
  • the major axis of eyelets 3 is also parallel to the longitudinal axis of the gripper, so that, by loosening screws 2, it is possible to move element 1 parallel to said longitudinal axis of the gripper by a distance indeed equal to the length of eyelets 3.
  • the front portion la of element 1, itself planar, is angled to the rear portion 1p, so as to be parallel to the rear edge 4p of gripper tip head 4.
  • a constant-width channel 5 is formed, which lies on a substantially vertical plane and is inclined in respect of the longitudinal axis of the gripper, so as to be parallel to the waiting weft thread.
  • the anti-loop device of the present invention consists of a weft thread deflector 6, which develops longitudinally at the bottom of weft thread entry channel 5, starting from an area in the proximity of the inlet 7 of elastic weft thread gripping means 8, 9 and towards the rear part of the gripper.
  • deflector 6 is arranged so that the weft thread starts resting on the surface thereof as soon as it arrives at the bottom of entry channel 5 and comes near gripping means inlet 7.
  • the resting of the weft thread on deflector 6 delays the entry of said thread in the gripping means and hence still allows modest sliding of the thread on inlet 7 during the further gripper advancement, so as to allow the weft thread to be perfectly taut, with no loop formation, and adequately retained within gripping means 8, 9 when it meets the cutting means.
  • deflector 6 is formed integrally with device 1 defining the rear wall of the weft entry channel, of which it makes up a side extension.
  • the end part of such extension which indeed makes up the resting surface of the weft thread sliding on the same, is inclined sideways and downwards, as is clearly visible in the cross-section of fig. 4 , by an angle between 0 and 90° and preferably between 50 and 80°.
  • Deflector 6 further has a wide radiussing area at the front connecting it with the front portion la of device 1, so as to offer continuous and steady support to the weft thread.
  • the extent of the support imparted by deflector 6 to the weft thread and consequently the extent of the delay with which said weft thread is inserted in gripping means 8, 9 can hence be modulated at pleasure by simply varying the inclination of the deflector to the vertical plane - the delay being null when the angle is 0° and being greatest when the angle is 90°, i.e. the resting surface of the deflector is substantially horizontal - and further making the connection between portion la of device 1 and deflector 6 more or less smooth.
  • deflector 6 develops longitudinally at the bottom of weft thread entry channel 5. More precisely, the free lower edge of deflector 6 - i.e. the edge from which the weft thread frees itself at the end of the "resting" action on the deflector - must be exactly at the height of inlet 7 of elastic gripping means 8, 9 of the weft thread.
  • deflector 6 integrally with device 1, the remarkable advantage is obtained that when device 1 is moved in order to vary the width of weft thread entry channel 5, anti-loop device 6 is consequently also moved in a way perfectly suited to its function.
  • elastic gripping means 8, 9 are fixed, it is obvious that when device 1 is moved back in order to weave with higher-count threads, the front edge of deflector 6 also moves arranging itself in a position closer to inlet 7 of the gripping means and hence the "resting" effect of the weft thread shows later and to a limited extent.
  • this corresponds exactly to the gripping requirements of a higher-count weft thread which must be fastened to the gripper by a tighter gripping action; in this case it is hence correct for the delayed action of the anti-loop device to be weaker.
  • deflector 6 integrally with device 1, which defines the rear wall of weft thread entry channel 5
  • device 1 which defines the rear wall of weft thread entry channel 5

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (7)

  1. Pince porteuse pour métiers à tisser, du type dans lequel, en arrière de la tête d'extrémité (4) de la pince, il est formé une rainure (5) pour l'insertion d'un fil de trame dans une zone intérieure de la pince et vers les moyens élastiques (8, 9) de pincement de trame, ladite rainure s'étendant sur un plan sensiblement vertical parallèle à la direction des fils de trame en attente, l'entrée (7) desdits moyens élastiques de pincement étant agencée sur le fond de ladite rainure (5) et immédiatement en aval de celle-ci, caractérisée en ce qu'elle comporte en outre un déflecteur (6) de fil de trame agencé latéralement à ladite entrée (7) des moyens élastiques de pincement (8, 9) et sur le côté opposé par rapport à l'extrémité du fil de trame relevée à l'étoffe en cours de tissage, ledit déflecteur (6) étant apte à retarder l'entrée du fil de trame dans lesdits moyens de pincement (8, 9).
  2. Pince porteuse pour métiers à tisser selon la revendication 1, dans laquelle ledit déflecteur (6) consiste en un élément fixé à la pince ou formé d'une seule pièce avec elle, qui se développe dans la direction longitudinale de la pince et présente une surface d'appui pour le fil de trame.
  3. Pince porteuse pour métiers à tisser selon la revendication 2, dans laquelle la surface d'appui pour le fil de trame formée sur ledit déflecteur (6) est arrondie à l'avant vers la paroi arrière de la rainure (5) d'entrée de fil de trame.
  4. Pince porteuse pour métiers à tisser selon la revendication 2, dans laquelle la surface d'appui de fil de trame formée sur ledit déflecteur (6) a une inclinaison comprise entre 0° et 90° par rapport à un plan vertical.
  5. Pince porteuse pour métiers à tisser selon la revendication 2, dans laquelle la surface d'appui de fil de trame formée sur ledit déflecteur (6) a une inclinaison comprise entre 50° et 80° par rapport à un plan vertical.
  6. Pince d'appui pour métiers à tisser selon la revendication 2, dans laquelle le bord inférieur libre dudit déflecteur (6) est agencé à la même hauteur que l'entrée (7) vers les moyens élastiques (8, 9) de pincement de fil de trame.
  7. Pince porteuse pour métiers à tisser selon l'une quelconque des revendications précédentes, laquelle pince comporte en outre un dispositif mobile (1) définissant la paroi arrière de la rainure (5) d'entrée de fil de trame, caractérisée en ce que ledit déflecteur (6) est formé d'une seule pièce avec ledit dispositif (1) et est mobile avec lui.
EP05425330A 2005-05-17 2005-05-17 Griffe porteuse pour métiers à tisser avec dispositif (anti-boucle) pour éviter le saisissement anticipé du fils de trame Active EP1724383B1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DE602005012062T DE602005012062D1 (de) 2005-05-17 2005-05-17 Bringergreifer für Webmaschinen mit einer (Anti-Schlingen-)Vorrichtung zur Vermeidung von vorzeitigem Greifen des Schussfadens
AT05425330T ATE419416T1 (de) 2005-05-17 2005-05-17 Bringergreifer für webmaschinen mit einer (anti- schlingen-)vorrichtung zur vermeidung von vorzeitigem greifen des schussfadens
EP05425330A EP1724383B1 (fr) 2005-05-17 2005-05-17 Griffe porteuse pour métiers à tisser avec dispositif (anti-boucle) pour éviter le saisissement anticipé du fils de trame
ES05425330T ES2318443T3 (es) 2005-05-17 2005-05-17 Agarre del soporte para tejer con dispositivo (anti-lazo) para impedir el agarre anticipado de la trama.
US11/345,377 US20060260709A1 (en) 2005-05-17 2006-02-02 Carrying gripper for weaving looms with (anti-loop) device to avoid anticipated weft gripping
TW095105654A TWI350864B (en) 2005-05-17 2006-02-20 Carrying gripper for weaving looms
CN2006100682561A CN1865562B (zh) 2005-05-17 2006-03-22 用于织机的带有防止环形成装置的运载夹纱器
KR1020060043622A KR20060119770A (ko) 2005-05-17 2006-05-16 예상되는 위사 파지를 피하기 위한 (비루프) 장치를구비하는 직기용 운반 그리퍼

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425330A EP1724383B1 (fr) 2005-05-17 2005-05-17 Griffe porteuse pour métiers à tisser avec dispositif (anti-boucle) pour éviter le saisissement anticipé du fils de trame

Publications (2)

Publication Number Publication Date
EP1724383A1 EP1724383A1 (fr) 2006-11-22
EP1724383B1 true EP1724383B1 (fr) 2008-12-31

Family

ID=35033805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425330A Active EP1724383B1 (fr) 2005-05-17 2005-05-17 Griffe porteuse pour métiers à tisser avec dispositif (anti-boucle) pour éviter le saisissement anticipé du fils de trame

Country Status (8)

Country Link
US (1) US20060260709A1 (fr)
EP (1) EP1724383B1 (fr)
KR (1) KR20060119770A (fr)
CN (1) CN1865562B (fr)
AT (1) ATE419416T1 (fr)
DE (1) DE602005012062D1 (fr)
ES (1) ES2318443T3 (fr)
TW (1) TWI350864B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103451829A (zh) * 2013-09-24 2013-12-18 虞放河 剑杆织机的送纬剑杆头底板

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1468819A (en) * 1973-06-15 1977-03-30 Mackie & Sons Ltd J Looms
FR2278815A1 (fr) * 1974-07-18 1976-02-13 Etcoma Sarl Passe-trame amenee a couvercle basculant
IT1290838B1 (it) * 1996-02-27 1998-12-14 Nuovo Pignone Spa Pinza di condotta perfezionata per telaio tessile a pinze
DE59705563D1 (de) * 1996-06-07 2002-01-10 Picanol Nv Gebergreifer für eine greiferwebmaschine
IT1303764B1 (it) * 1998-11-17 2001-02-23 S M I T S R L Societa Macchine Pinza di condotti per telai senza navetta particolarmente adatta perl'introduzione contemporanea di piu' trame nella bocca di ordito
EP1256644B1 (fr) * 2001-05-08 2009-06-17 Promatech S.p.A. Griffe d'amenée pour métiers à tisser ajustable en fonction du titrage du fil de trame
DE60220788T2 (de) * 2002-08-30 2008-03-06 Promatech S.P.A., Colzate Verbesserungen an Schussfadengreifern für Webmaschinen und an Webmaschinen mit Führungsmitteln dafür
EP1923494B1 (fr) * 2002-09-20 2012-02-08 Picanol Lance de transfert pour un métier à tisser à pince

Also Published As

Publication number Publication date
ES2318443T3 (es) 2009-05-01
EP1724383A1 (fr) 2006-11-22
DE602005012062D1 (de) 2009-02-12
CN1865562B (zh) 2010-09-29
TW200706716A (en) 2007-02-16
CN1865562A (zh) 2006-11-22
US20060260709A1 (en) 2006-11-23
KR20060119770A (ko) 2006-11-24
ATE419416T1 (de) 2009-01-15
TWI350864B (en) 2011-10-21

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