WO2011092085A1 - Dispositif pneumatique d'étirage du fil de trame pour des machines à tisser à jet d'air, avec une tête de déviation de trame disposée à l'intérieur du canal de lancement du peigne - Google Patents

Dispositif pneumatique d'étirage du fil de trame pour des machines à tisser à jet d'air, avec une tête de déviation de trame disposée à l'intérieur du canal de lancement du peigne Download PDF

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Publication number
WO2011092085A1
WO2011092085A1 PCT/EP2011/050618 EP2011050618W WO2011092085A1 WO 2011092085 A1 WO2011092085 A1 WO 2011092085A1 EP 2011050618 W EP2011050618 W EP 2011050618W WO 2011092085 A1 WO2011092085 A1 WO 2011092085A1
Authority
WO
WIPO (PCT)
Prior art keywords
weft
reed
weft thread
nozzle
cavity
Prior art date
Application number
PCT/EP2011/050618
Other languages
English (en)
Inventor
Marcel Christe
Original Assignee
Itema (Switzerland) Ltd
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 Itema (Switzerland) Ltd filed Critical Itema (Switzerland) Ltd
Publication of WO2011092085A1 publication Critical patent/WO2011092085A1/fr

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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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/308—Stretching or holding the weft

Definitions

  • the present invention refers to a pneumatic stretching device of the weft thread for air-jet weaving looms, with a weft deflecting head arranged inside the launch channel of the reed.
  • the invention refers to a device of this type which can be used directly - i.e. without particular adaptations except simply moving the device into the correct position - also with reeds of a greater width than the fabric being woven.
  • the weft thread is launched into the shed by a compressed-air jet delivered by a main nozzle, and said thread is supported during its travel by a series of secondary nozzles arranged along the weaving loom slay.
  • the individual parallel teeth making up the reed all have a particular loop-shaped configuration in the central portion thereof, so as to determine overall a channel having a substantially C-shaped transversal section, with the open portion facing towards the fabric being woven.
  • This tunnel-shaped channel is precisely the one inside which an air stream is established - by means of the main nozzle and the secondary nozzles - which carries the weft thread through the shed.
  • stretching devices which are no longer arranged sideways of the reed but in front of the same have hence been proposed in the art, so that their position can be adjusted at any desired location of the slay to adapt to the width of the fabric being woven at any one time.
  • This different arrangement of the stretching devices has of course implied an evident drawback, since the device is no longer at the exit of the launch channel, and hence in the most natural position to pick up the weft thread, but before the same. It is hence necessary to pick up the weft thread within the launch channel or to impart the weft thread a deviation towards the outside of the launch channel, so that it can then be picked up by the stretching device.
  • BE 1017893 discloses a stretching device comprising a tubular element fixed inside the C-shaped launch channel of the reed of a loom, downstream of the warp yarns.
  • a wider inlet of the tubular element allows to form an air jet therein with a nozzle positioned in front of the reed.
  • An auxiliary nozzle is positioned behind the reed to tear-out the tip of weft threads which have been beaten-up out of the stretching nozzle.
  • Warp yarn stretching is obtained without any deviation of the weft yarn from its rectilinear path within the launch channel.
  • the stretching force acting on the weft yarn is consequently weak and a strong air jet is needed for maintaining the weft yarn conveniently stretched during reed beating.
  • EP 1897981 discloses a stretching device wherein the weft yarn is deviated from its path thanks to a flat nozzle inserted between two teeth of the reed and blowing in the beating direction. The weft yarn head is then picked up into a receiving opening of a bent stretching tube fixed to the upper portion of the reed. Due to the position of said stretching tube in front of the reed channel and not inside the reed channel, the disclosed device has however the disadvantage of a low reliability in catching the weft thread.
  • the object of the invention is hence to propose a structure of a weft thread stretching device in an air-jet weaving loom, of the above described type arranged before the reed, which overcomes the above highlighted drawbacks of the known devices and hence allows to obtain a reliable catching of the weft thread, without interfering with the reed structure and which requires only a low consumption of compressed air.
  • This object is reached through a stretching device having the features defined in claim 1.
  • the dependent claims define other preferred features of the invention.
  • fig. 1 is a perspective view of the stretching device of the present invention
  • fig. 2 is an elevation side view of the device of fig. 1 ;
  • fig. 3 is a top plan and partly section view of the device of fig. 1 ;
  • fig. 4 is a lateral diagrammatic, partly section view of a weaving loom sley equipped with a reed, whereon the stretching device shown in fig. 1 is mounted;
  • fig. 5 is a diagrammatic top-plan, partly section view of the weaving loom with the invention device shown in fig. 4;
  • fig. 6 is a perspective view of the weaving loom with the invention device shown in fig. 4;
  • fig. 7 is a view similar to fig. 4 wherein the position of warp yarns is further shown;
  • fig. 8 is a view similar to fig. 5 wherein the path of the weft thread in the stretching device of the invention is shown and the position of the warp yarns and of the fabric being woven is further shown;
  • fig. 9 is an enlarged view of the detail encircled in fig. 8, concerning the weft thread deflecting head of the device of fig. 1.
  • the portion of a weaving loom is diagram- matically shown, whereon the stretching device of the present invention is mounted.
  • the oscillating slay S whereon reed R is mounted is shown.
  • Stretching device 1 of weft thread W is mounted on the front part of slay S, and hence before the reed, through a slider coupling with locking means which allow the fastening thereof in any position along the slay, depending on the height of the fabric T being woven.
  • device 1 is fastened on slay S so as to be almost adjacent to warp threads 0 (fig. 8) .
  • the slider coupling described above is fully known per se and as a matter of fact it is habitually used for the mounting on the slay of the devices the position of which is susceptible of adjustment on the width of the weaving loom, such as for example secondary nozzles N; the structure thereof will hence not be further discussed here in detail.
  • Device 1 hence comprises a base 2 equipped with guiding and fixing means to a corresponding rail of slay S and having a sufficient vertical length so that the upper portion 2a of base 2 lies approximately in correspondence of the central portion of reed R, i.e. of the portion where launch channel C is formed.
  • a main body 3 of stretching device 1 is fastened through a pair of screws 4.
  • the body 3 of stretching device 1 comprises a thicker first portion 3e facing the reed R and a much thinner second portion 3i, which forms the weft thread deflecting head and is inserted in launch channel C so as to be adjacent - on the bot- torn of said channel - to the teeth L of reed R.
  • first portion 3e there are provided fast connecting means 5 to the source of compressed air and a stretching tube 8 for catching and stretching the weft thread W.
  • a communication pipe 6 for the passage of compressed air from connecting means 5 to a nozzle 7 arranged at a short distance from the inlet of stretching tube 8 and apt to drive the weft thread W in the same.
  • Nozzle 7 is formed so as to be coaxial to stretching tube 8, the common axis of these two elements being substantially perpendicular to the direction of in- sertion of weft thread W.
  • the diameter of pipe 6 is preferably smaller than the diameter of stretching tube 8; typical acceptable ranges for these diameters are for example comprised between 1 and 2 mm for pipe 6 and between 4 and 6 mm for stretching tube 8.
  • the thickness of said weft deflecting portion 3i of the device 1 is just about sufficient to house said compressed- air pipe 6, while the thickness of said thicker portion 3e of the device 1 is just about sufficient to house said weft thread catching tube 8.
  • the second thinner portion 3i of body 3, on the side fac- ing the direction from which weft thread W is fed, is provided with a deflecting area to guide the displacement of the weft thread up to arrive in front of the nozzle 7, inside a cavity 9 formed between said nozzle and the inlet of stretching tube 8.
  • the width of said cavity 9 is very short, for example equal to 2mm and this causes the air jet coming out of nozzle 7 to minimally disturb the main air stream transporting the weft thread into launch channel C.
  • this deflecting area consists firstly of a plug 10 - apt to close the outlet of pipe 6 formed during drilling of said pipe in portion 3i - which is provided with an outer surface inclined towards cavity 9 and furthermore with a small appendix 11 which fits between two reed teeth L to prevent a possible unde- sired deviation of weft thread W towards reed R instead of towards cavity 9.
  • the external surface of plug 10 ends in correspondence of a rounded bevel 12 which imparts to the tip of incoming weft thread W a change of direction towards the one of the axis of the stretching tube 8 while it accompanies the displacement of the weft thread into a crosswise direction, away from the reed, until it enters the field of action of nozzle 7.
  • the tip of incoming weft thread W is prevented from entering inside the reed by appendix 11 and softly deviated by the inclined surface of plug 10 and by the rounded bevel 12 from the bottom of launch channel C away from the reed R and towards the cavity 9 of device 1, even before the weft thread W perceives the depression effect caused inside said cavity by the compressed air jet coming out of nozzle 7 and entering tube 8; a low degree of air depression is hence sufficient to obtain a reliable deviation of weft thread W inside said tube.
  • the device of the invention thanks to this high reliabil- ity in catching the weft threads and contrarily to the above discussed prior art, does not need any supplementary nozzle behind the reed to tear-out the tip of a weft thread which has been beaten-up out of the stretching device.
  • weft thread W When weft thread W enters stretching tube 8, said thread builds an angle of about 90° to the main part of the thread which is stretched across the shed. This angle allows to accomplish a strong friction between weft thread W and the edge of tube 8 and, consequently, a quick dampening of the thread oscillations is achieved as well as a good stretching force also with a reduced length of the weft tails (for example 4 - 8 cm) compared to the one of known devices wherein there is no 90° deviation of the weft thread. Moreover, the length of the weft tails can be kept constant also during shed closing and reed beating operations, due to the fact that the catching point of weft thread W - i.e.
  • the entrance edge of stretching tube 8 - is arranged exactly on the line of the warp yarns when the shed is closed (discontinued line in fig. 7) .
  • This hence allows both to maintain a constant stretching on the weft thread and not to have displacement of the weft thread with respect to the catching point thereof during shed closing, unlike what happens instead in the prior art (Sulzer) illustrated above where the catching point is arranged above the warp yarn line when the shed is closed. Also this further object of the invention is hence thereby achieved.
  • the main air stream for weft transportation which is formed inside said channel is very poorly disturbed and the use of the stretching device of the invention does not require any change of the work parameters of the weaving loom, in particular as concerns flow rate and orientation of the air jets of the main nozzle and of the secondary nozzles.
  • the weft deflecting portion of device 1 does not penetrate between the teeth of reed R, but is simply adjacent to the same, no reed damage occurs, even after repeated uses of the device in different positions along the reed R.

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

Abstract

L'invention porte sur un dispositif pneumatique d'étirage de fil de trame (1) pour des machines à tisser à jet d'air comprenant un battant oscillant (S) et un peigne (R) d'un seul tenant avec celui-ci, constitué de plusieurs dents adjacentes façonnées de façon à former un canal de lancement de trame (C). Un dispositif d'étirage (1), monté de manière coulissante sur le battant (S) afin qu'il puisse être fixé dans une position désirée sur ledit battant oscillant (S), comprend une partie de déviation de trame plus fine (3i) disposée à l'intérieur dudit canal de lancement de peigne (C) adjacent à la paroi inférieure de celle-ci et une partie plus épaisse (3e) faisant face au peigne, lesdites parties (3i, 3e) étant partiellement séparées par une cavité (9) dans laquelle a lieu la récupération du fil de trame. La partie de déviation de trame (3i) comprend des moyens de déviation fixes destinés à déplacer le bout dudit fil de trame (W) de la zone inférieure du canal de lancement (C) vers une buse (7) de ladite cavité de récupération (9), ladite buse (7) étant alimentée par un tuyau (6) logé au moins partiellement dans ladite partie plus fine (3i) et étant apte à distribuer un jet d'air comprimé dans ladite cavité (9). La partie plus épaisse (3e) faisant face au peigne (R) comprend un tube de capture (8) faisant face à ladite buse (7) sur le côté opposé de ladite cavité (9) afin de capturer le fil de trame (W) à partir de ladite cavité de récupération (9) sous l'action dudit jet d'air comprimé.
PCT/EP2011/050618 2010-01-26 2011-01-18 Dispositif pneumatique d'étirage du fil de trame pour des machines à tisser à jet d'air, avec une tête de déviation de trame disposée à l'intérieur du canal de lancement du peigne WO2011092085A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10151719.1 2010-01-26
EP10151719A EP2348144A1 (fr) 2010-01-26 2010-01-26 Dispositif d'étirement pneumatique du fil de trame pour métiers à tisser à jet d'air, avec tête de déviation de trame agencée dans le canal de lancement du peigne

Publications (1)

Publication Number Publication Date
WO2011092085A1 true WO2011092085A1 (fr) 2011-08-04

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PCT/EP2011/050618 WO2011092085A1 (fr) 2010-01-26 2011-01-18 Dispositif pneumatique d'étirage du fil de trame pour des machines à tisser à jet d'air, avec une tête de déviation de trame disposée à l'intérieur du canal de lancement du peigne

Country Status (2)

Country Link
EP (1) EP2348144A1 (fr)
WO (1) WO2011092085A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104294466B (zh) * 2014-10-22 2016-11-23 吴江市天缘纺织有限公司 螺旋式吸纱器
BE1024755B1 (nl) * 2016-11-29 2018-06-27 Picanol Nv Afvaleinde-strekinrichting voor een weefmachine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0133153A1 (fr) * 1983-07-11 1985-02-13 Rüti-Te Strake B.V. Dispositif pour fixer une pièce auxiliaire sur le peigne d'un métier à tisser sans navette
EP1722019A1 (fr) * 2004-02-19 2006-11-15 Kabushiki Kaisha Nikkyo Seisakusho Dispositif de tension de trame pour m tier jet
EP1897981A1 (fr) 2006-09-07 2008-03-12 Sultex AG Procédé et dispositif d'étirage pour tenir un fil de trame
BE1017893A5 (nl) 2007-12-10 2009-10-06 Te Strake Textile Bv Strekinrichting voor het strekken van een inslagdraad.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0133153A1 (fr) * 1983-07-11 1985-02-13 Rüti-Te Strake B.V. Dispositif pour fixer une pièce auxiliaire sur le peigne d'un métier à tisser sans navette
EP1722019A1 (fr) * 2004-02-19 2006-11-15 Kabushiki Kaisha Nikkyo Seisakusho Dispositif de tension de trame pour m tier jet
EP1897981A1 (fr) 2006-09-07 2008-03-12 Sultex AG Procédé et dispositif d'étirage pour tenir un fil de trame
BE1017893A5 (nl) 2007-12-10 2009-10-06 Te Strake Textile Bv Strekinrichting voor het strekken van een inslagdraad.

Also Published As

Publication number Publication date
EP2348144A1 (fr) 2011-07-27

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