EP1126062B1 - Procédé et dispositif de formation d'une lisière à bout rentrée dans les métiers à tisser à jet d'air - Google Patents

Procédé et dispositif de formation d'une lisière à bout rentrée dans les métiers à tisser à jet d'air Download PDF

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Publication number
EP1126062B1
EP1126062B1 EP01103476A EP01103476A EP1126062B1 EP 1126062 B1 EP1126062 B1 EP 1126062B1 EP 01103476 A EP01103476 A EP 01103476A EP 01103476 A EP01103476 A EP 01103476A EP 1126062 B1 EP1126062 B1 EP 1126062B1
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EP
European Patent Office
Prior art keywords
weft
channel
shed
pneumatic means
receiving channel
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.)
Expired - Lifetime
Application number
EP01103476A
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German (de)
English (en)
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EP1126062A1 (fr
Inventor
Giancarlo Oprandi
Boris Nettuno
Osvaldo Capitanio
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
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Publication of EP1126062A1 publication Critical patent/EP1126062A1/fr
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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
    • D03D47/40—Forming selvedges
    • D03D47/48—Forming selvedges by inserting cut end of weft in next shed, e.g. by tucking, by blowing

Definitions

  • the present invention relates to a method and.a device for forming the inset selvage in air looms and in particular to a device of this type operated pneumatically and devoid of movable parts.
  • the weft tail thus formed was sucked up inside a suction nozzle, the nozzle was displaced into a zone upstream of the weft insertion line and, finally, the weft tail was reinserted inside the shed, reversing the direction of the air flow inside the nozzle.
  • This solution has the advantage of providing excellent results from a weaving point of view, providing an inset selvedge free from defects and with a constant height, but has the drawback of the mechanical complexity required for nozzle displacements.
  • DE-A-725262 discloses a device for pneumatically forming an inset selvage, comprising a plurality of stationary nozzles which, through respective compressed blowing/suction air jets provide to reinsert the weft tails into the shed. This document has been considered as the closest prior art of the present invention and its features are reported in the introductory part of the independent claims 1) and 5).
  • the reinsertion of the weft tail in a zone upstream of the weft insertion line is a highly desirable procedure because in this zone the distance between the warp yarns is sufficiently high to ensure that 100% of the weft tails are reinserted correctly inside the shed. If operation takes place in the vicinity of the weft insertion line, as in fact occurs in EP-A-786,547, the distance between the warp yarns is very low and therefore there is the possibility - anything but infrequent - that weft tails may be reinserted outside the shed, i.e. above or below the warp yarns, so that they are not woven inside the fabric together with the following wefts, resulting in a defective fabric.
  • the object of the present invention is therefore that of providing a method and a device for forming the inset selvage in air looms, which are devoid of the drawbacks shown by the known selvedge forming devices and, therefore, in particular, which do not use moving mechanical parts, while allowing reinsertion of the weft tails in a zone upstream of the weft insertion line, and along a direction substantially parallel to said line.
  • EP-A-1088922 is an intermediate document according to art.
  • 54(3) and (4) EPC which discloses a device for pneumatically forming an inset selvage, comprising a plurality of stationary nozzles which, through respective blowing/suction compressed air jets provide to reinsert the weft tails into the shed after having transferred the same in a zone upstream of the weft insertion line.
  • the manufacturing of this device requires however the use of different nozzles and the separate feeding of said nozzles with respective air flows.
  • This method is preferably implemented using a device according to Claim 5.
  • fig. 1 is a schematic plan view of a loom incorporating four devices for forming the inset selvage according to the present invention
  • fig. 2A is a front perspective view of the device for forming the inset selvage according to the present invention.
  • fig. 2B is a perspective view, similar to fig. 2A, with parts partially removed, showing a first selvedge formation step;
  • fig. 2C is a perspective view, similar to fig. 2B, showing a second selvedge formation step
  • fig. 3A is a perspective view, from below, of the top part of the device for forming the inset selvage according to the present invention
  • fig. 3B shows, on a larger scale, the detail of the adjustable nozzle shown in Fig. 2C;
  • figs. 4A, 4B and 4C show three different operation steps of the device.
  • FIG. 2 The particular structure of the inset selvedge forming device according to the present invention is clearly shown in Fig. 2.
  • This device consists of a block of metallic material 1 formed by a top block 1s and a bottom block 1i, which are assembled together and fixed to the loom in a manner known per se, using screw means (not shown) after performing the necessary mechanical machining operations thereon. Once assembly has been performed, the block 1 appears as in Fig. 2A, while its internal structure, described in detail below, is illustrated in the split views according to Figs. 2B and 2C as well as in Figs. 3A and 3B.
  • the top block 1s has a first vertical through-channel 2 exactly crossing the weft insertion line L.
  • the channel 2 continues into a channel 3 aligned therewith and formed in the bottom block 1i.
  • the top block 1s also comprises other three vertical through-channels 4, 5 and 6, the axes of which lie in a vertical plane which is perpendicular to the weft insertion line L and positioned at a certain distance from the channel 2, towards the outside of the weaving zone, as can be seen in Figs. 2B and 3A.
  • the channel 4 is a smooth-wall channel, similarly to the former channels 2 and 3.
  • the channel 5 has an internal threading, inside which an adjusting screw 11 with a narrow-diameter central portion is engaged.
  • the channel 6 houses internally an adjustable nozzle 7, the structure of which will be described below, and is provided with end zones with a larger diameter which form the seats for respective sealing O-rings.
  • the channels 4, 5 and 6, finally, are connected together by a transverse channel 8, which channel also has smooth walls.
  • the outlet opening 10 may have any suitable shape in order to create an outlet air jet of the desired shape.
  • a preferred opening 10 has, for example, the shape of a slit, with the larger side arranged parallel to the warp yarns and with the internal walls flared in the form of a triangle, so as to form a fan-type air jet with the desired angular width.
  • the bottom part of the top block 1s is provided with recesses 12 and 13 for guiding the air flows, the function of which will become clear below.
  • the recess 13 is formed in an undercut zone 14 of the block 1s, suitable for allowing the weft yarn T to pass through the block 1.
  • the air flow to the channel 2 is interrupted and an air flow to the channel 4 is activated.
  • the compressed air introduced into this channel splits up at the channel 8 into two streams E and F; the distribution ratio of the streams E and F may be adjusted by operating the screw 11 which throttles, with its end, the flow of the stream E through the recess 12.
  • the compressed air flow E flowing out from the recess 12, interferes with the weft tail C housed inside the channel 3 and begins to transfer the same in a direction perpendicular to the weft insertion line L, i.e. towards a zone upstream of said line, until the weft tail C is positioned in front of the outlet opening 10 of the nozzle 7.
  • the walls of the recess 12 may be formed at the outlet so as to direct the flow E towards the common axis of the channels 2 and 3.
  • the compressed air flow F passes along the whole channel 8, enters into the channel 6 at the narrow-diameter zone 7a of the nozzle 7 and then, penetrating into the inlet openings 9 and into the internal cavity of the nozzle 7, emerges from the opening 10 exactly in the zone to which the weft end C has been transferred by the air flow E.
  • the flow F allows the said weft tail C to be reinserted inside the shed, as schematically illustrated in Fig. 4C and, in greater detail, in Fig. 2C, during the weaving step where in the reed P is moving back towards the beating-up zone.
  • the angular position of the nozzle 7 may be adjusted using an ordinary screwdriver inserted into an end notch 15, so as to obtain the desired direction of insertion of the end C, which is as parallel as possible to the weft insertion line.
  • the weft tail C is displaced by the air flow E from a position aligned with the weft insertion line L into a zone upstream thereof.
  • the insertion of the weft end by the compressed air flow F may be performed in this zone in a reliable manner and parallel to the weft yarns, owing to the fact that the warp yarns are here positioned at a greater distance from each other.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Storage Of Fruits Or Vegetables (AREA)

Claims (16)

  1. Procédé pour former la lisière rentrée dans un métier à tisser à jet d'air comprenant un moyen pour insérer le fil de trame à l'intérieur de la foule, un peigne (P) pour battre le fil de trame (T) ainsi inséré et un moyen pour couper le fil de trame - du type dans lequel le fil de trame (T) est coupé à une distance suffisante du premier et du dernier fil de chaîne pour former des bouts de trame libres (C), chacun desquels étant dévié de façon pneumatique dans un canal récepteur (3) puis, après fermeture de la foule et avant insertion d'un nouveau fil de trame, étant réinséré de façon pneumatique dans la foule afin d'être battu conjointement au nouveau fil de trame - caractérisé en ce que, avant de réinsérer le bout de trame (C) dans la foule, le procédé comprend l'étape de transfert pneumatique du bout de trame depuis ledit canal récepteur (3), dans une direction perpendiculaire à la ligne d'insertion de trame (L), jusqu'à une zone en amont de celle-ci ; les étapes de transfert et réinsertion pneumatiques du bout de trame (C) étant réalisées au moyen d'un seul jet d'air comprimé divisé en deux flux distincts (E, F) à l'intérieur d'un seul dispositif pneumatique (1) pour former la lisière rentrée.
  2. Procédé selon la revendication 1, dans lequel la position angulaire du flux d'air (F) qui permet de réinsérer de façon pneumatique le bout de trame est réglable.
  3. Procédé selon la revendication 1, dans lequel le rapport de distribution entre lesdits deux flux distincts (E, F), respectivement prévus pour transférer et réinsérer les bouts de trame, est réglable.
  4. Procédé selon la revendication 2, dans lequel ledit flux d'air (F) est un jet d'air du type ventilateur ayant une largeur angulaire souhaitée.
  5. Dispositif pour former la lisière rentrée dans un métier à tisser à jet d'air, comprenant un moyen pour insérer le fil de trame à l'intérieur de la foule, un peigne (P) pour battre le fil de trame ainsi inséré et un moyen pour couper le fil de trame - du type dans lequel le fil de trame (T) est coupé à une distance du premier et du dernier fil de chaîne suffisante pour former des bouts de trame libres (C) qui sont réinsérés dans la foule afin d'être battus conjointement au nouveau fil de trame - le dispositif comprenant, en outre, un canal (3) pour recevoir le bout de trame (C) formé dans un bloc fixé au métier en une position adjacente au bord de l'étoffe étant tissée, un premier moyen pneumatique pour dévier le bout de trame (C) à l'intérieur dudit canal récepteur (3), et un troisième moyen pneumatique pour réinsérer le bout de trame (C) à l'intérieur de la foule, caractérisé en ce qu'il comprend un deuxième moyen pneumatique pour transférer le bout de trame (C) depuis ledit canal récepteur (3), dans une direction perpendiculaire à ladite ligne d'insertion de trame (L), jusqu'à une zone en amont de celle-ci, et en ce que la position angulaire de l'embouchure de sortie (10) dudit troisième moyen pneumatique est réglable.
  6. Dispositif selon la revendication 5, dans lequel lesdits deuxième et troisième moyens pneumatiques comprennent des canaux d'alimentation (12 et 8, 6) reliés à une source d'insufflation d'air comprimé via un seul canal distributeur (4).
  7. Dispositif selon la revendication 6, comprenant, en outre, un moyen de commande (11) pour régler la répartition du flux d'air comprimé entre lesdits deux canaux (12 et 8, 6) desdits deuxième et troisième moyens pneumatiques.
  8. Dispositif selon la revendication 6, dans lequel lesdits premier, deuxième et troisième moyens pneumatiques sont tous logés à l'intérieur du même bloc (1) dans lequel ledit canal récepteur (3) est formé.
  9. Dispositif selon la revendication 5 ou 6, dans lequel l'axe dudit canal récepteur (3) coupe sensiblement la ligne d'insertion de trame (L) et forme un angle par rapport à celle-ci.
  10. Dispositif selon la revendication 5 ou 6, dans lequel l'axe dudit canal récepteur (3) est sensiblement perpendiculaire à la ligne d'insertion de trame (L).
  11. Dispositif selon l'une quelconque des revendications 5 à 10, dans lequel ledit premier moyen pneumatique est formé par un premier canal (2) fournissant de l'air d'insufflation comprimé et aligné avec le canal récepteur de bout de trame (3).
  12. Dispositif selon l'une quelconque des revendications 5 à 10, dans lequel ledit deuxième moyen pneumatique est formé par un deuxième canal (4, 12) fournissant de l'air d'insufflation comprimé, dont la portion d'extrémité (12) a une direction sensiblement perpendiculaire à la fois à l'axe dudit canal récepteur (3) et à la ligne d'insertion de trame (L), le flux d'air (E) dudit deuxième moyen pneumatique étant apte à frapper l'ouverture d'entrée dudit canal récepteur de bout de trame (3), afin de transférer le bout de trame (C), dans une direction perpendiculaire à la ligne d'insertion de trame (L), jusqu'à une zone en amont de celle-ci.
  13. Dispositif selon l'une quelconque des revendications 5 à 10, dans lequel ledit troisième moyen pneumatique est formé par un troisième canal (4, 8, 6) fournissant de l'air d'insufflation comprimé et se terminant dans une buse (7), ladite buse étant positionnée en amont de la ligne d'insertion de trame (L), dans une zone où le bout de trame (C) est fourni par ledit deuxième moyen pneumatique, le flux d'air (F) dudit troisième moyen pneumatique étant apte à réinsérer le bout de trame (C) à l'intérieur de la foule.
  14. Dispositif selon l'une quelconque des revendications 5 à 13, dans lequel l'embouchure (10) de la buse (7) dudit troisième canal fournisseur est située à une distance du bord de l'étoffe supérieure à celle dudit canal récepteur de bout de trame (3).
  15. Dispositif selon l'une quelconque des revendications 5 à 14, dans lequel l'embouchure (10) de la buse (7) dudit troisième canal fournisseur a la forme d'une fente, dont le côté long est parallèle aux fils de chaîne et dont les parois internes sont évasées sous la forme d'un triangle.
  16. Dispositif selon l'une quelconque des revendications 5 à 15, dans lequel ladite buse (7) est percée intérieurement pour former une cavité interne pour le flux d'air (F) dudit troisième canal fournisseur (4, 8, 6) entre une ou plusieurs ouvertures d'entrée (9) et l'embouchure (10) de la buse (7).
EP01103476A 2000-02-14 2001-02-14 Procédé et dispositif de formation d'une lisière à bout rentrée dans les métiers à tisser à jet d'air Expired - Lifetime EP1126062B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI000241 2000-02-14
IT2000MI000241A IT1316367B1 (it) 2000-02-14 2000-02-14 Metodo per la formazione della cimossa rientrata in telai ad aria edispositivo per attuare detto metodo

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EP1126062A1 EP1126062A1 (fr) 2001-08-22
EP1126062B1 true EP1126062B1 (fr) 2006-09-06

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EP01103476A Expired - Lifetime EP1126062B1 (fr) 2000-02-14 2001-02-14 Procédé et dispositif de formation d'une lisière à bout rentrée dans les métiers à tisser à jet d'air

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EP (1) EP1126062B1 (fr)
AT (1) ATE338840T1 (fr)
DE (1) DE60122799T2 (fr)
ES (1) ES2269237T3 (fr)
HK (1) HK1039969A1 (fr)
IT (1) IT1316367B1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4132793B2 (ja) * 2001-11-22 2008-08-13 津田駒工業株式会社 織布のタックイン耳形成方法
CZ2012797A3 (cs) * 2012-11-16 2014-03-05 Incot Spol. S R.O. Multifunkční zakládací tryska
JP7290983B2 (ja) * 2019-04-04 2023-06-14 津田駒工業株式会社 空気噴射式タックイン装置用のタックインヘッド

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE725262C (de) * 1939-09-02 1942-09-18 Sulzer Ag Vorrichtung zum Herstellen fester Kanten bei Geweben
IT1251849B (it) * 1991-09-23 1995-05-26 Somet Soc Mec Tessile Metodo per la formazione della cimossa rientrata in telai senza navetta ed in particolare in telai ad aria e dispositivo per realizzare tale metodo
DE19548846C1 (de) * 1995-12-27 1996-10-10 Dornier Gmbh Lindauer Verfahren und Vorrichtung zum Einlegen eines Schußfadens

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Publication number Publication date
ITMI20000241A1 (it) 2001-08-14
ES2269237T3 (es) 2007-04-01
ITMI20000241A0 (it) 2000-02-14
ATE338840T1 (de) 2006-09-15
DE60122799D1 (de) 2006-10-19
HK1039969A1 (en) 2002-05-17
EP1126062A1 (fr) 2001-08-22
DE60122799T2 (de) 2007-09-13
IT1316367B1 (it) 2003-04-10

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