EP2226416B1 - Startdüse mit Schussfadenrückhaltemitteln für eine pneumatische Webmaschine - Google Patents

Startdüse mit Schussfadenrückhaltemitteln für eine pneumatische Webmaschine Download PDF

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Publication number
EP2226416B1
EP2226416B1 EP10155605.8A EP10155605A EP2226416B1 EP 2226416 B1 EP2226416 B1 EP 2226416B1 EP 10155605 A EP10155605 A EP 10155605A EP 2226416 B1 EP2226416 B1 EP 2226416B1
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EP
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Prior art keywords
nozzle
bristles
launch
lance
weft
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EP10155605.8A
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English (en)
French (fr)
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EP2226416A1 (de
Inventor
Osvaldo Capitanio
Claudio Ranza
Davide Maccabruni
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Itema SpA
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    • 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
    • D03D47/3006—Construction of the nozzles
    • D03D47/3013—Main nozzles

Definitions

  • the present invention refers to an improved launch nozzle for a pneumatic weaving loom.
  • weaving in a weaving loom requires that a series of crosswise wefts is inserted into a set of parallel warp yarns, opening said yarns scissor-wise, according to different and preset patterns, by means of the weaving machine. Upon each insertion, the weft is then beaten against the fabric being formed, by means of a reed device, and the cycle is repeated at very high speeds, up to 1.200-1.500 strikes per minute.
  • weft insertion into the warp shed occurs according to various technologies.
  • the weft is inserted using an air jet which blows the weft, through a suitable launch nozzle, at the entrance of the warp shed; along the warp shed additional relay nozzles are located with air jets which make the weft thread flies towards the shed exit, on the opposite side of the loom.
  • Fig. 1 shows schematically the devices intended for weft insertion in a weaving loom.
  • the weft thread comes out of a thread spool, runs on a drum pre-meter, enters a pre-nozzle and then a main nozzle. From said main nozzle, through a suitable control of the compressed air flow, the weft thread is inserted into the warp shed until it comes out from the opposite side. Once it is completely inserted, the weft thread is cut in correspondence of the entry side, so as to severe it from the spool and leave it inserted in the fabric: a new thread end is thus formed, which can be inserted again during the following cycle.
  • This configuration is suited to a single weft thread and is repeated for the number of weft threads (different by colour, type, count, and so on) made simultaneously available on the same loom.
  • the need exists to arrange the launch point of all weft threads (i.e. of all the nozzles) around a very small area. Therefore, on a practical level, at least the final launch device normally consists of a rather complex assembly which incorporates a plurality of lances with which the individual weft threads are associated.
  • Such a multiple, prior-art nozzle, able to handle up to four weft threads is illustrated in figs. 2 and 3 , in an assembled condition and in an exploded condition, respectively.
  • a main block body 1 has a series of seats 1a with converging axes. Inside such seats there are inserted, on the entry side - i.e. on the upstream side with respect to the flow direction - a corresponding plurality of needles 2, i.e. devices configured to suitably channel the air flow together with the weft thread. On the exit side, within the seats 1a of the block body there are engaged base bodies 3 of rectilinear lances 4, which converge towards a head clamp 5 which keeps them with the open ends closely adjacent. Each lance 4 is substantially shaped as a hollow cannula, with a base body 3 having an enlarged diameter suitable for coupling with the seats of block body 1.
  • a problem affecting this type of configuration is that of keeping the weft thread correctly inserted in the nozzles, i.e. of avoiding that the thread can come out upstream of the needle.
  • the weft thread is kept taut and correctly inserted only by the dynamic air pressure; therefore, when it is cut at the end of the insertion, the elastic return of the fibre material may cause the free end to come up along the lance and come out behind the needle.
  • the exit of the thread from the nozzle forces to stop the loom to be able to re-enter the thread, with inevitable productivity reduction, costs and possible fabric flaws.
  • One provides to supply the nozzle block body with a series of (electric or, usually, pneumatic) actuators which are operative between the body of the lance and the needles with a gripping system apt to mechanically clamp the weft thread.
  • FIG. 2 An exemplifying embodiment of this system of the prior art is shown precisely in figs. 2 and 3 .
  • main block body 1 crosswise seats 10 are provided with which gripping devices 11 are engaged, said devices being variously controlled, for example by means of a pneumatic circuit.
  • This mode is quite effective, because it allows to securely retain the weft thread and avoid the exit thereof on the upstream side of the nozzle.
  • it is very expensive, because it provides the use of reliable actuators operating at a high frequency (as a matter of fact, the gripping system must release the weft thread during the launch and block it after cutting with a frequency equal to the number of insertions per minute, up to 25 Hz), as well as a drive chain synchronised with the main drive of the loom. This system also requires considerable maintenance.
  • a second approach provides to use a continuous air jet within the lances (both during operation and with a stationary loom).
  • the dynamic air pressure in addition to allowing the weft launch when it is released from the weft feeders, prevents it from being able to rise backwards when it is cut.
  • EP 2014808 discloses a tubular element to be provided within an air-jet channel.
  • the trailing edge of the tubular element is provided with a plurality of notches defining a plurality of corresponding projections.
  • JP51124159 discloses a launch nozzle for a weft thread, comprising a conical ar-ray of flexible elements abuttig outside from the launch nozzle output opening, said flexible elements being able to retain the thread with their mutually contacting free ends.
  • a weft thread launch nozzle according to the preamble of claim 1 is known from JP 2007 177341 A .
  • the object of the present invention is hence to solve the above-mentioned problems, suggesting an innovative retaining system of the weft thread inside launch nozzles.
  • a launch nozzle for a weft thread in a pneumatic weaving loom, of the type comprising at least one lance, which projects from a respective base body, provided with a through-hole in which it is possible to establish a flow of compressed air, wherein said base body has ciliated means inside, provided with a central gap for compressed air.
  • the ciliated means are shaped as a tubular support wherefrom tufts of bristles project.
  • ciliated means for a nozzle of a pneumatic weaving loom consisting of a tubular portion from the trailing edge of which a plurality of flexible needle means project, along the longitudinal tubular axis.
  • the nozzle device according to the invention provides a configuration fully similar to the prior-art one, thereby hence remaining fully interchangeable in prior-art systems and weaving looms.
  • a tubular support body 31 is provided inside the base body 3 of lances 4 , wherefrom flexible tufts or groups of bristles 32 depart.
  • bristles 32 are distributed circumferentially on the circular trailing edge downstream of support body 31 and extend substantially along the longitudinal axis of the nozzle hole provided in body 3, i.e. along the longitudinal axis of lance 4.
  • Tubular support 31 is preferably shaped as a ring of plastic material, with which bristles 32 are engaged, but it can also have other shapes. However, it is important that it comprises a central through-hole sufficiently wide not to obstruct the airflow path.
  • Bristles 32 can be engaged with annular/tubular support 31 by means known per se, for example small metal anchors, or by injection molding techniques as used in the toothbrush field.
  • bristles 32 are not perfectly parallel to the longitudinal axis of lance 4, but are slightly convergent towards one another, for example between 8° and 12°, preferably about 10°, so as to partly narrow the gap between the same.
  • the tubular support body 31 provided with bristles 32 - which defines a ciliated body - is arranged inside lance body 3, with its internal hole having the same axis as the nozzle axis.
  • each lance 4 is shaped as a hollow cylinder 33, integral with the cannula of lance 4, with which a cylindrical core 34 may be engaged, said core being provided with a longitudinal through-hole.
  • Tubular support 31, provided with bristles 32, is inserted into hollow cylinder 33 and retained there in position - with the bristles projecting from support 31 in the air flow direction - by the subsequent insertion of cylindrical core 34.
  • core 34 is preferably provided with one or more O-rings 34a, by which a steady coupling with hollow cylinder 33 is guaranteed.
  • One or more further O-rings 34b are provided in the proximity of the rear end of core 34, to guarantee instead the coupling with seat 1a in the main block body 1.
  • Core 34 further has a recessed portion 34c with which a clamp element (not shown) is intended to engage, which tightens lance body 3 on block body 1: for such purpose, hollow cylinder 33 is provided with a hole 33a which grants access to underlying recessed portion 34c, once core 34 has been inserted into cylinder 33.
  • the presence of the bristles is an effective tool to avoid an upstream movement of the weft thread, once the air flow has been interrupted.
  • they define - seen in the upstream direction - a plurality of spread tips on which the thread tends to get easily entangled.
  • weft yarn entangling is obtained also upon elastic deformation of the bristles (which are bent compared to their original rectilinear shape); this results in an easy disentangling effect as soon as the regular air flow is established, after the beating phase of the loom: in fact, the air flow straightens the bristles back up into their rectilinear shape to easily free the weft yarn.
  • the simplicity and compactness of the proposed ciliated means makes the device of the invention interchangeable with any existing multiple nozzle.
  • the lance provided with ciliated means according to the invention can replace any existing lance, regardless of the retaining system previously used, without having to change other components.
  • the element defined as ciliated body be provided with bristles consisting of groups of flexible single threads.
  • it may comprise thin flexible laminas, small metal needles or flexible cilia; again, the entire brush body 31, 32 may be in a single body shaped as a bottomless basket, with slightly conical walls defined by a small net.
  • any ciliated means which does not obstruct the air flow proceeding downstream, but which defines a plurality of entangling flexible needles proceeding upstream falls within the inventive principle set forth above (in order not to introduce important load losses, nor significant chafing against the weft threads during the launch phase).

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (8)

  1. Startdüse für Schussfaden in einer pneumatischen Webmaschine, der Bauart umfassend zumindest eine Lanze (4), die sich von einem entsprechenden Grundkörper (3) erstreckt, versehen mit einer Durchgangsöffnung, durch die eine Druckluftströmung erzeugt wird, und weiter umfassend flexible Zilienmittel, die in der Luftströmungsrichtung vorstehen, dadurch gekennzeichnet, dass die flexiblen Zilienmittel (31, 32) innerhalb des Grundkörpers (3) eingefügt sind und mit einem zentralen Spalt versehen sind, durch den die genannte Druckluftströmung strömt.
  2. Startdüse nach Anspruch 1, dadurch gekennzeichnet, dass der genannte Grundkörper (3) der Lanze (4) aus einem hohlen Zylinder (33) besteht, in den ein zylindrischer Kern (34) eingesetzt werden kann, wobei der Kern mit einer longitudinalen Durchgangsöffnung versehen ist, wobei die flexiblen Zilienmittel zwischen den genannten Kern (34) und dem hohlen Zylinder (33) angeordnet sind.
  3. Düse nach Anspruch 1 oder 3, dadurch gekennzeichnet, dass die flexiblen Zilienmittel als rohrförmiger, mit Borsten (32) versehener Träger (31) ausgebildet ist.
  4. Düse nach Anspruch 3, dadurch gekennzeichnet, dass die genannten Borsten (32) von einer Vorderkante stromab des genannten rohrförmigen Trägers (31) entlang dessen Längsachse vorstehen.
  5. Düse nach Anspruch 4, dadurch gekennzeichnet, dass die genannten Borsten (32) zueinander konvergieren.
  6. Startdüse nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der genannte Grundkörper (3) der Lanze (4) mit einem Austrittssitz eines Hauptblockkörpers (1), der auf der gegenüberliegenden Seite des Austrittssitzes mit einem Eintrittssitz versehen ist, mit dem eine Nadel (2) in Eingriff steht, in Eingriff steht.
  7. Startdüse nach Anspruch 6, dadurch gekennzeichnet, dass der genannte Hauptblockkörper (1) eine Anzahl von Lanzen (4) aufweist, die mit ihren jeweiligen offenen Enden zueinander konvergieren.
  8. Pneumatische Webmaschine, dadurch gekennzeichnet, dass sie eine Düse und flexible Zilienmittel aufweist, gemäß einem der vorangehenden Ansprüche.
EP10155605.8A 2009-03-06 2010-03-05 Startdüse mit Schussfadenrückhaltemitteln für eine pneumatische Webmaschine Active EP2226416B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000336A ITMI20090336A1 (it) 2009-03-06 2009-03-06 Ugello di lancio con mezzi di ritegno di trama per un telaio tessile ad aria.

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EP2226416A1 EP2226416A1 (de) 2010-09-08
EP2226416B1 true EP2226416B1 (de) 2016-05-18

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EP (1) EP2226416B1 (de)
CN (1) CN101845700B (de)
IT (1) ITMI20090336A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6024536B2 (ja) * 2013-03-15 2016-11-16 株式会社豊田自動織機 エアジェット織機のメインノズル
CN104164735B (zh) * 2014-08-08 2015-08-19 浙江理工大学 一种进气旋度及进气流量连续可调的喷气织机主喷嘴
JP6137133B2 (ja) * 2014-11-18 2017-05-31 株式会社豊田自動織機 エアジェット織機のメインノズル
CN106637604A (zh) * 2016-11-17 2017-05-10 曹才基 一种新型喷气织机辅助喷嘴结构及其制作方法
IT202400004792A1 (it) 2024-03-05 2025-09-05 Itema Spa Supporto per ugelli principali di lancio di telai ad aria, muniti di mezzi a spazzola di ritenuta dei fili di trama

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007177341A (ja) * 2005-12-27 2007-07-12 Tsudakoma Corp 流体噴射式織機の緯入ノズル

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Publication number Priority date Publication date Assignee Title
JPS51124159U (de) * 1975-03-20 1976-10-07
EP0342135A1 (de) * 1988-05-10 1989-11-15 S.A. Saurer Diederichs Schussfadensaug und -haltevorrichtung für Webmaschinen mit pneumatischem Schusseintrag
DE19511439C1 (de) * 1995-03-29 1996-03-14 Dornier Gmbh Lindauer Verfahren zur Leistungssteigerung beim Schußfadeneintrag in ein Webfach einer Luftdüsenwebmaschine und Eintragsdüse zur Durchführung des Verfahrens
CN2578357Y (zh) * 2002-07-22 2003-10-08 广东溢达纺织有限公司 串联喷嘴上置有棕毛束的喷气织机
EP1552048B1 (de) 2002-09-18 2007-03-14 Lindauer Dornier Gesellschaft M.B.H Verfahren zum halten eines schussfadens; düsenwebmaschine mit klemmeinrichtung für den schussfaden insbesondere zur durchführung des verfahrens und kartusche als auswechselbare baueinheit zum einsetzen in das mischrohr einer düsenwebmaschine
DE502005010656D1 (de) * 2005-11-25 2011-01-20 Itema Switzerland Ltd Vorrichtung und Verfahren zum Eintragen von Schussfäden
CN101210361A (zh) * 2006-12-28 2008-07-02 苏尔特克斯股份公司 引纬装置和方法
JP2009007694A (ja) * 2007-06-27 2009-01-15 Tsudakoma Corp 緯入れノズルおよび緯入れノズルに用いられる緯糸のノズル抜け防止部材

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007177341A (ja) * 2005-12-27 2007-07-12 Tsudakoma Corp 流体噴射式織機の緯入ノズル

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ITMI20090336A1 (it) 2010-09-07
CN101845700A (zh) 2010-09-29
EP2226416A1 (de) 2010-09-08
CN101845700B (zh) 2014-11-12

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