EP2006430B1 - Dispositif de séparation et procédé de suppression d'une trame défectueuse dans un métier à tisser - Google Patents

Dispositif de séparation et procédé de suppression d'une trame défectueuse dans un métier à tisser Download PDF

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Publication number
EP2006430B1
EP2006430B1 EP20070425386 EP07425386A EP2006430B1 EP 2006430 B1 EP2006430 B1 EP 2006430B1 EP 20070425386 EP20070425386 EP 20070425386 EP 07425386 A EP07425386 A EP 07425386A EP 2006430 B1 EP2006430 B1 EP 2006430B1
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EP
European Patent Office
Prior art keywords
fabric
weft
faulty
wedging
loom
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.)
Not-in-force
Application number
EP20070425386
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German (de)
English (en)
Other versions
EP2006430A1 (fr
Inventor
Osvaldo Capitanio
Fabio Rabolini
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
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Promatech SpA
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Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Priority to DE200760010441 priority Critical patent/DE602007010441D1/de
Priority to EP20070425386 priority patent/EP2006430B1/fr
Publication of EP2006430A1 publication Critical patent/EP2006430A1/fr
Application granted granted Critical
Publication of EP2006430B1 publication Critical patent/EP2006430B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
    • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
    • D03D51/085—Extraction of defective weft

Definitions

  • the present invention concerns a device and a method for the parting and removal of a faulty weft.
  • a weft may be inserted in a faulty manner into the shed due to various reasons, both textile and mechanical; however, it must be removed whenever its presence could lead to a fault visible also in the finished fabric.
  • FR2527655 discloses a removal apparatus for faulty weft yearns in a weaving loom, comprising a sliding hook. The hook is used to hold the faulty yearn and separate it from the leading edge portion of a fabric being woven, transversally to the weft yarns.
  • FR 2583435 discloses a similar apparatus, where an array of tips are aligned along the weft yearns under the fabric being woven. Said array of tips is moved up and down and forward-backward through a cam-follower mechanism.
  • the object of the present invention is hence that of providing a removal device of a faulty weft and a method therefor which overcomes the drawbacks highlighted above.
  • it is intended to provide a device which is simple, effective, does not interfere with the other weaving members, is applicable also to existing looms and, above all, allows to reduce the complexity and duration of intervention operations.
  • the device for the parting of the faulty weft comprises at least a tip head arranged according to an axis substantially transversal to the fabric being woven on the loom and being movable according to its longitudinal axis and, by means of the movement of the sley, movable also crosswise to its longitudinal axis in a direction substantially parallel to the warp yarns.
  • the device for the parting of a faulty weft comprises a plurality of tip heads arranged substantially crosswise to the fabric being woven on the loom and aligned to the weft yarns.
  • the tip heads are mounted integral with the front side of a loom sley.
  • the tip heads are longitudinally movable by means of a pneumatic actuator which imparts a force F, directed towards the fabric, smaller than the one necessary to damage the fabric.
  • the tip heads have a vertex shape suited not to pierce the fabric and the relative actuators are preferably mounted in a height-adjustable way on the sley.
  • a removal method of a faulty weft yarn from a fabric being woven on a weaving loom comprising the steps of
  • Fig. 1 shows a portion of fabric 3 being woven, supported by a fabric supporting shelf 1.
  • the fabric consists of an array of warp threads 4 which interlace with a series of weft yarns 5.
  • the last inserted weft is referred to as 5a; during the normal weaving operations, after having been introduced said weft is beaten - by a reed of sley B ( fig. 8 ) - kept adhering to fabric 3 due to the effect of the subsequent crossing of the warp yarns (as visible in fig. 1 ).
  • the loom is provided with at least one or a plurality of weft parting tip heads 2, preferably arranged underlying the fabric with their longitudinal axis substantially crosswise (perpendicular) to the fabric being woven, mounted so as to be able to perform a movement both parallel and perpendicularly to the longitudinal axis thereof.
  • the parting tip heads 2 can be mounted on a suitable control bar, according to a preferred embodiment, each tip head 2 is mounted integral with sley B and so as to be able to perform a movement along the longitudinal axis thereof; in particular, tip head 2 can be lifted, approaching above-lying fabric 3, or lowered, moving away from the fabric.
  • the vertex of the tip head is more or less rounded off depending on the fabric with which it is to interact but nevertheless such as to reduce the possibility of an undesired piercing of the woven fabric: as a matter of fact, it is intended to be inserted in between two sufficiently loose adjoining wefts (the last two introduced wefts) and hence to wedge in between the same until parting the last one from the preceding one.
  • the tip head vertex With thin yarns, which produce a remarkable tightening between the wefts upon beating of the sley, the tip head vertex must be sharper, while with thicker yarns, producing a fabric with more distanced wefts, the tip head may be advantageously more rounded at its vertex, which also aids a more regular operation, as will be detailed in the following.
  • parting tip head 2 is integral with a piston of a pneumatic actuator (not visible), which is in turn actuated by an electrovalve.
  • the pneumatic actuator is fastened on the front side (i.e. the fabric-facing one) of the weaving loom sley and can be fed with compressed air coming from the pneumatic circuitry onboard the loom.
  • the device according to the invention is positively simple, providing only one or more tip heads (a number thereof depending on loom width, but for example 6 or 8 tip heads for loom width of 190 and 230 cm, respectively) controlled according to a longitudinal movement and displaceable crosswise integrally with the sley.
  • Each tip head is controlled so as to fit in between the last-but-one, correctly-introduced weft 5 and the last faulty weft 5a, so as to wedge in between the same and then to detach and move away the faulty weft from the last-but-one weft of fabric 3. Thanks to the movement of the tip head or of all the tip heads arranged along the sley in a direction substantially parallel to the warp yarns (hence perpendicular to the weft yarns), the faulty weft is detached remaining substantially parallel to the preceding one, thereby causing only crosswise loads with no longitudinal component to be applied on the wefts.
  • weft 5a is a faulty weft, which must be parted from fabric 3 and then removed.
  • the sley After having beaten the last faulty weft 5a, the sley is set, with a stationary loom, in a preset position. In this position, the line of action of tip head 2 is directed at the last three or four wefts belonging to fabric 3.
  • the pneumatic actuator i.e. the piston integral with the tip head
  • the pneumatic actuator is then actuated to bring the tip head close to fabric 3 ( fig. 3 ), adjusting the pressure so that pneumatic thrust F be the desired one, i.e. the one determined according to the features of the fabric, of the yarn, and of the weft density.
  • a low-intensity force F is used; for fabrics having tight and compact wefts, force F is increased.
  • force F is set so that tip head 2 may rest on, and "feel", above-lying fabric 3, during the movement of the sley, without running through it.
  • the head tip touches fabric 3, it is made to move back together with the sley, with which it is integral.
  • the head tip thereby feels the lower face of fabric 3 ( fig. 4 ) while the reed of the sley moves back; at the same time, the opening of warp shed 4 takes place, which operation occurs in phase with the movement of the sley by means of controls known per se.
  • the last weft 5a becomes free to move towards the reed.
  • the tip head can hence easily wedge in between the last-but-one weft 5 and faulty weft 5a, until detaching the latter, as shown in fig. 5 .
  • the synchronisation between the opening of the warp shed and the reed movement is such as to allow tip heads 2 to engage with faulty weft 5a when it is devoid of the restraint formed by the crossing of warp yearns 4.
  • the force F of tip head 2 is hence able to overcome the adhesion between the wefts and hence detach and displace faulty weft 5a.
  • tip head 2 moves away the portion of weft 5a from fabric 3, being integral with the reed which continues the movement backwards.
  • Weft portion 5a is ready to be removed by means of known-type automatic removal devices.
  • the tip heads with the relative actuators are extremely simple and reliable devices and can be applied to the sley of any loom, even already operatively installed (hence available as retrofit).
  • the weft detachment step is performed by actively exploiting the backward run of the sley, which would otherwise represent an unused idle time.
  • repair time there derives also a general reduction of repair time, because the weft is already detached at the end of the shed opening step and it is hence possible to carry out weft removal at once, without having to wait for a new introduction of the auxiliary weft.
  • the number of actuators may vary depending on the loom width, but already with one it is theoretically possible to obtain an effective detachment of the faulty weft, with extremely reduced costs.
  • pneumatic actuators Although reference has always been made to pneumatic actuators, it is not ruled out that it may be possible to adopt other-type actuators, for example electric ones (for example having linear motors) with a relative drive.

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

Claims (10)

  1. Dispositif de séparation pour une trame défectueuse dans un métier à tisser, comprenant au moins un moyen d'insertion (2) disposé essentiellement transversalement à une partie de tête d'un tissu en cours de tissage sur le métier à tisser, ledit moyen d'insertion (2) ayant une forme permettant de l'insérer entre deux fils de trame adjacents le long d'un axe d'intervention respectif et étant également mobile transversalement audit axe d'intervention, dans lequel le moyen d'insertion comprend au moins une tige (2) disposée selon un axe essentiellement transversal à ladite partie de tissu en cours de tissage sur le métier à tisser et conformée de façon à être mobile le long de son axe longitudinal et également transversalement à son axe longitudinal dans une direction essentiellement parallèle aux fils de chaîne, caractérisé en ce que lesdites tiges (2) sont montées sur la partie avant d'un rot (B) du métier à tisser.
  2. Dispositif de séparation pour une trame défectueuse dans un métier à tisser suivant la revendication 1, comprenant une pluralité de tiges (2) disposées essentiellement alignées sur les fils de trame.
  3. Dispositif suivant l'une quelconque des revendications 1 à 2, dans lequel lesdites tiges (2) sont mobiles longitudinalement à l'aide d'un actionneur pneumatique.
  4. Dispositif suivant la revendication 3, dans lequel lesdites tiges (2) font partie intégrante d'un piston dudit actionneur pneumatique.
  5. Dispositif suivant l'une quelconque des revendications 1 à 4, dans lequel lesdites tiges (2) sont disposées à proximité de ladite partie de tissu en cours de tissage, de sorte que, dans leur mouvement longitudinal et transversal, elles peuvent sentir au moins les deux/quatre dernières trames de tissu.
  6. Dispositif suivant l'une quelconque des revendications 1 à 5, dans lequel lesdites tiges (2) sont mobiles le long de leur axe longitudinal via un actionneur qui applique une force orientée vers le tissu (F) inférieure à celle nécessaire pour passer à travers le tissu.
  7. Procédé d'élimination d'un fil de trame défectueux d'un tissu en cours de tissage sur un métier à tisser, comprenant les étapes de
    détecter la présence d'un fil de trame défectueux (5a); déplacer en arrière un rot du métier (B);
    ouvrir la foule de chaîne (4) afin de libérer la trame défectueuse (5a) des fils de chaîne;
    enlever le fil de trame défectueux (5a);
    comprenant en outre, avant l'étape d'enlèvement du fil de trame défectueux (5a), les étapes de
    disposer au moins un moyen d'insertion (2) à proximité de la zone de formation du tissu, disposé avec un axe d'intervention propre essentiellement transversal à une partie de bord de tête du tissu,
    provoquer l'insertion dudit moyen d'insertion entre l'avant-dernière trame (5) et la dernière trame défectueuse (5a) libérée des fils de chaîne,
    provoquer le mouvement d'écartement/en arrière dudit moyen d'insertion engagé dans ladite trame défectueuse (5a) depuis le tissu jusqu'au détachement de ladite trame défectueuse (5a) de la trame précédente (5), où ledit moyen d'insertion a la forme d'une ou plusieurs tiges (2), caractérisé en ce que lesdites tiges (2) sont amenées à se déplacer à l'écart/en arrière du tissu intégré au rot (B).
  8. Procédé suivant la revendication 7, dans lequel lesdites tiges (2) sont disposées en dessous du tissu (3) et sont conçues pour se soulever au contact avec le tissu à l'aide d'actionneurs pneumatiques.
  9. Procédé suivant la revendication 8, dans lequel lesdites tiges (2) sont comme dans l'une quelconque des revendications 1 à 5.
  10. Procédé suivant l'une quelconque des revendications 7 à 9, dans lequel ledit moyen d'insertion est amené à s'engager dans au moins les dernières trames (5, 5a) avec une force (F), dirigée le long de l'axe d'intervention relatif, qui est plus petite que celle nécessaire pour percer le tissu.
EP20070425386 2007-06-22 2007-06-22 Dispositif de séparation et procédé de suppression d'une trame défectueuse dans un métier à tisser Not-in-force EP2006430B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200760010441 DE602007010441D1 (de) 2007-06-22 2007-06-22 Teilungsvorrichtung und Verfahren zur Entfernung eines fehlerhaften Schussfadens in einer Webmaschine
EP20070425386 EP2006430B1 (fr) 2007-06-22 2007-06-22 Dispositif de séparation et procédé de suppression d'une trame défectueuse dans un métier à tisser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070425386 EP2006430B1 (fr) 2007-06-22 2007-06-22 Dispositif de séparation et procédé de suppression d'une trame défectueuse dans un métier à tisser

Publications (2)

Publication Number Publication Date
EP2006430A1 EP2006430A1 (fr) 2008-12-24
EP2006430B1 true EP2006430B1 (fr) 2010-11-10

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Application Number Title Priority Date Filing Date
EP20070425386 Not-in-force EP2006430B1 (fr) 2007-06-22 2007-06-22 Dispositif de séparation et procédé de suppression d'une trame défectueuse dans un métier à tisser

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EP (1) EP2006430B1 (fr)
DE (1) DE602007010441D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6028773B2 (ja) * 2014-09-09 2016-11-16 株式会社豊田自動織機 エアジェット織機における緯糸処理方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8202215A (nl) * 1982-06-01 1984-01-02 Rueti Te Strake Bv Spoelloze weefmachine, voorzien van middelen voor het uit het weefvak verwijderen van defecte inslagdraden.
US4502512A (en) * 1982-07-21 1985-03-05 Seisakusho Kabushiki Kaisha Toyoda Jidoshokki Method for treating a weft yarn upon stoppage of a shuttleless loom and device for effecting the same
US4635686A (en) * 1984-10-24 1987-01-13 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method for treating a weft yarn in a shuttleless loom and device for effecting the same
FR2583435B1 (fr) * 1985-06-14 1987-09-18 Picanol Nv Procede et dispositif d'extraction de fils de trame defectueux d'un metier a tisser sans navette
BE1000904A4 (nl) * 1987-09-04 1989-05-09 Picanol Nv Werkwijze voor het losmaken van foutieve inslagdraden bij weefmachines en inrichting die deze werkwijze toepast.
JPH01260040A (ja) * 1988-04-06 1989-10-17 Tsudakoma Corp よこ糸抜き取り装置
JP2561084Y2 (ja) * 1990-06-22 1998-01-28 株式会社豊田自動織機製作所 ジェットルームにおける緯糸処理装置
US5950684A (en) * 1995-06-02 1999-09-14 Sulzer Rueti Ag Removal of a weft thread in a series shed weaving machine

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EP2006430A1 (fr) 2008-12-24
DE602007010441D1 (de) 2010-12-23

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