EP1614785A1 - Hilfsdüse für eine pneumatische Webmaschine - Google Patents

Hilfsdüse für eine pneumatische Webmaschine Download PDF

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Publication number
EP1614785A1
EP1614785A1 EP04425491A EP04425491A EP1614785A1 EP 1614785 A1 EP1614785 A1 EP 1614785A1 EP 04425491 A EP04425491 A EP 04425491A EP 04425491 A EP04425491 A EP 04425491A EP 1614785 A1 EP1614785 A1 EP 1614785A1
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EP
European Patent Office
Prior art keywords
air
nozzle
axes
port
holes
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.)
Withdrawn
Application number
EP04425491A
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English (en)
French (fr)
Inventor
Egidio Tasca
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FIRST SpA
Original Assignee
FIRST SpA
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Publication date
Application filed by FIRST SpA filed Critical FIRST SpA
Priority to EP04425491A priority Critical patent/EP1614785A1/de
Publication of EP1614785A1 publication Critical patent/EP1614785A1/de
Withdrawn legal-status Critical Current

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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
    • D03D47/302—Auxiliary nozzles

Definitions

  • the launch system (fig. 1) generally consists of a prenozzle/launch nozzle 1 assembly, arranged sideways to the loom, by which the weft yarn T is shot into the shed through a jet of compressed air.
  • the energy imparted to the weft yarn by the main nozzle 1, however, is not sufficient to allow the weft yarn to cross the whole loom width; for this reason, inside the shed there is provided a system for pneumatic weft transport consisting of a plurality of secondary nozzles 2 arranged at an even distance along the shed.
  • Such secondary nozzles blow jets of compressed air in the direction of advancement of the weft yarn, which jets are sufficient to impart to the weft yarn the energy necessary to cover the entire length through the weaving loom.
  • a first positive effect is hence obtained due to the fact that the air jets coming out of the individual holes have a smaller diameter and increased speed, so that their directional ability is improved; there is also a second positive effect due to the fact that conical air dispersions of the jets coming out of the holes arranged in the inner part of the rosette tend to interfere with each other forming a more concentrated flow; however, there is also a negative effect due to the fact that the conical shape of the jets coming out of the holes arranged on the outer edge of the rosette has a larger angle, and hence greater dispersion, due to the small size of the holes.
  • the overall effect of this hole distribution does hence not produce effects as positive as might have been expected.
  • the axes of the tiny holes arranged in a rosette array are formed with mutually converging inclinations, with respect of the axis of the central tiny hole of the rosette, preferably so as to converge into a single point which, when the secondary nozzle is mounted on the weaving loom, arranges itself in an area inside launch channel 4.
  • the experimental tests carried out have shown in particular that the best results can be obtained with an inclination angle of the outer holes of the rosette comprised between 0,3° and 1°, which means that the convergence point of the different jets is located at a distance between 150 and 60 mm from the nozzle.
  • the tiny holes of said port preferably have a diameter comprised between 100 and 400 ⁇ m.
  • the manufacture of the nozzle according to the present invention does not show any particular complication compared to the current manufacturing techniques of traditional multiple-hole nozzles.
  • the technology used for drilling the holes is in fact still spark erosion, in which, however, the device is programmed so as to drill the holes at different inclinations, and then obtain the desired convergence effect.
  • the inclination of the different holes of the rosette is such that the beam of the axes of the holes is suitably biased laterally, as shown in fig. 4 and 5, so that the convergence point of the axes of the different holes when the secondary nozzle is mounted on the weaving loom, is located within launch channel 4.
EP04425491A 2004-07-05 2004-07-05 Hilfsdüse für eine pneumatische Webmaschine Withdrawn EP1614785A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04425491A EP1614785A1 (de) 2004-07-05 2004-07-05 Hilfsdüse für eine pneumatische Webmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425491A EP1614785A1 (de) 2004-07-05 2004-07-05 Hilfsdüse für eine pneumatische Webmaschine

Publications (1)

Publication Number Publication Date
EP1614785A1 true EP1614785A1 (de) 2006-01-11

Family

ID=34932609

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425491A Withdrawn EP1614785A1 (de) 2004-07-05 2004-07-05 Hilfsdüse für eine pneumatische Webmaschine

Country Status (1)

Country Link
EP (1) EP1614785A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3204363A1 (de) * 1982-02-09 1983-08-11 Guenne Webmaschf Gmbh Verfahren und strahlduese zum transportieren eines schussfadens durch ein webfach mittels druckluft
US4433705A (en) * 1979-10-03 1984-02-28 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Picking channel for a jet loom
EP0308754A1 (de) * 1987-09-21 1989-03-29 Hermann Josef Foery Düse zur Erzeugung eines Fluidstrahles
EP0516587A1 (de) * 1991-05-28 1992-12-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Hilfsdüse für eine pneumatische Webmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4433705A (en) * 1979-10-03 1984-02-28 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Picking channel for a jet loom
DE3204363A1 (de) * 1982-02-09 1983-08-11 Guenne Webmaschf Gmbh Verfahren und strahlduese zum transportieren eines schussfadens durch ein webfach mittels druckluft
EP0308754A1 (de) * 1987-09-21 1989-03-29 Hermann Josef Foery Düse zur Erzeugung eines Fluidstrahles
EP0516587A1 (de) * 1991-05-28 1992-12-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Hilfsdüse für eine pneumatische Webmaschine

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