EP0393468A1 - Schussfadenabsaugvorrichtung für Luftwebmaschinen - Google Patents

Schussfadenabsaugvorrichtung für Luftwebmaschinen Download PDF

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Publication number
EP0393468A1
EP0393468A1 EP90106797A EP90106797A EP0393468A1 EP 0393468 A1 EP0393468 A1 EP 0393468A1 EP 90106797 A EP90106797 A EP 90106797A EP 90106797 A EP90106797 A EP 90106797A EP 0393468 A1 EP0393468 A1 EP 0393468A1
Authority
EP
European Patent Office
Prior art keywords
weft yarn
suction device
reed
lamina
shutting
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Withdrawn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
EP90106797A
Other languages
English (en)
French (fr)
Inventor
Ettore Viscardi
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
Original Assignee
SOMET Societa Meccanica Tessile SpA
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 SOMET Societa Meccanica Tessile SpA filed Critical SOMET Societa Meccanica Tessile SpA
Publication of EP0393468A1 publication Critical patent/EP0393468A1/de
Withdrawn legal-status Critical Current

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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 technique of shuttleless looms is known to include the so-­called air looms, wherein the weft yarn is drawn into the warp shed by a controlled air stream.
  • Said air stream is produced by a main blow nozzle - through which the weft yarn is fed - and is maintained and controlled by a plurality of secondary nozzles, each of which produces a so-called secondary jet in order to keep a regular air stream allowing to draw the weft yarn from one end of the loom - where the main blow nozzle is posi­tioned - to the opposite end thereof, where a suction device is normally provided to draw and retain the weft yarn by depression.
  • the object of the present invention is to provide a suction de­vice with improved performances as compared to prior art devices. This result is essentially obtained due to the fact that said device comprises a movable shutting lamina, apt to progressively close the suction mouth as the reed approaches the beating up position.
  • the suc­tion mouth is formed as an arched slit, extending along a width substan­tially corresponding to the width of the stroke of the sley, and the shutting lamina is associated to the reed moving with the sley.
  • the loom comprises - in known manner - a sley 1 and a reed 2 moving from position A (backward waiting position of figs. 1 and 2) to the beating up position B.
  • position A backward waiting position of figs. 1 and 2
  • the warp shed is open to allow the passage of the weft yarn.
  • the weft yarn is drawn through the warp shed simply thanks to the action of a controlled air stream. Said air stream is blown by the main nozzle 3, is maintained through the shed by secondary nozzles (not shown), and reaches the mouth 4 of the suction device.
  • the weft yarn follows the same path, in the sense that it is launched through said nozzle 3, it is guided by the air stream along the shed, and it is sucked into the mouth 4.
  • the suction mouth 4 is formed as an elongated slit, sha­ped as a circle arc, which practically covers an area corresponding to the whole oscillation path of the channel 2a of the reed 2. Furthermore, always according to the main object of the present invention, a movable lamina 5 is associated to the oscillating reed 2 for the purpose of pro­gressively shutting the suction mouth 4.
  • the lamina 5 is fixed just be­hind the reed channel 2a - in respect of the reed moving direction F du­ring beating up - and it has a dimension such as to be apt to fully cover the suction mouth 4.
  • the shutting lamina 5 leaves the suction mouth 4 totally free in correspondence of the reed position A (fig. 4), that is, the reed waiting position, with open shed.
  • the lamina 5 moves in turn and progressively re­duces the opening of the mouth 4 (fig. 5), up to full shutting thereof (fig. 6) at the end of the stroke.
  • This mechanism works as follows: with the reed 2 in a waiting position A, the weft yarn emerges from the nozzle 3, is drawn through the warp shed and reaches the mouth 4. The weft yarn is kept taut between the nozzle 3 and the mouth 4 thanks to the air stream in between them. At this point, the reed beating up movement starts, during which the mouth 4 is progressively shut by the lamina 5. As a result of the reduction in the section of the mouth 4, while the flow rate of the air stream keeps constant, its speed increases. The pulling action on the weft yarn is thereby also increased, whereby the yarn is more and more taut until weaving thereof.
  • a first great advantage of the device according to the present invention thus derives from the fact that it ensures a perfect tensioning of the weft yarn just at the critical moment of the weaving step.
  • a second advantage concerns instead the fact that, by increasing the speed of the air stream just when the shed closes and the reed appro­aches the beating up poSition, said air stream is apt to remove any waste or filaments which may be present at the bottom of the reed channel, as well as any dust produced during weaving; this allows to keep the loom members cleaner, especially sensors and photoelectric cells, and to make the weaving environment less dusty.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP90106797A 1989-04-21 1990-04-09 Schussfadenabsaugvorrichtung für Luftwebmaschinen Withdrawn EP0393468A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2095189U 1989-04-21
IT2095189U IT216529Z2 (it) 1989-04-21 1989-04-21 Dispositivo aspiratore del filo di trama per telaio di tessitura ad aria.

Publications (1)

Publication Number Publication Date
EP0393468A1 true EP0393468A1 (de) 1990-10-24

Family

ID=11174525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106797A Withdrawn EP0393468A1 (de) 1989-04-21 1990-04-09 Schussfadenabsaugvorrichtung für Luftwebmaschinen

Country Status (2)

Country Link
EP (1) EP0393468A1 (de)
IT (1) IT216529Z2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5226458A (en) * 1991-01-04 1993-07-13 Picanol N.V., Naamloze Venootschap Device for the stretching of a weft thread in weaving machines
EP0567943A1 (de) * 1992-04-25 1993-11-03 Lindauer Dornier Gesellschaft M.B.H Einrichtung zum pneumatischen Führen turbulenter Schussfadenenden einer Hilfsgewebeleiste in Luftdüsenwebmaschinen
WO1998045517A1 (de) * 1997-04-09 1998-10-15 Textilma Ag Webmaschine mit pneumatischer schussfadeneintragung
WO2018099662A1 (en) * 2016-11-29 2018-06-07 Picanol Waste end stretching device for a weaving machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2081753A (en) * 1980-08-11 1982-02-24 Rueti Te Strake Bv Weft tensioning in jet looms
WO1983002466A1 (en) * 1982-01-16 1983-07-21 Griffith, John, Dalton Yarn holding device
EP0310804A2 (de) * 1987-09-11 1989-04-12 Picanol N.V. Verfahren zum Entfernen eines fehlerhaft eingebrachten Schussfadens an einer Luftwebmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2081753A (en) * 1980-08-11 1982-02-24 Rueti Te Strake Bv Weft tensioning in jet looms
WO1983002466A1 (en) * 1982-01-16 1983-07-21 Griffith, John, Dalton Yarn holding device
EP0310804A2 (de) * 1987-09-11 1989-04-12 Picanol N.V. Verfahren zum Entfernen eines fehlerhaft eingebrachten Schussfadens an einer Luftwebmaschine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5226458A (en) * 1991-01-04 1993-07-13 Picanol N.V., Naamloze Venootschap Device for the stretching of a weft thread in weaving machines
EP0567943A1 (de) * 1992-04-25 1993-11-03 Lindauer Dornier Gesellschaft M.B.H Einrichtung zum pneumatischen Führen turbulenter Schussfadenenden einer Hilfsgewebeleiste in Luftdüsenwebmaschinen
WO1998045517A1 (de) * 1997-04-09 1998-10-15 Textilma Ag Webmaschine mit pneumatischer schussfadeneintragung
US6223779B1 (en) 1997-04-09 2001-05-01 Textilma Ag Auxiliary selvage forming and weft thread cutting device
WO2018099662A1 (en) * 2016-11-29 2018-06-07 Picanol Waste end stretching device for a weaving machine
BE1024755B1 (nl) * 2016-11-29 2018-06-27 Picanol Nv Afvaleinde-strekinrichting voor een weefmachine
CN109983166A (zh) * 2016-11-29 2019-07-05 必佳乐公司 用于织机的废料端拉伸装置

Also Published As

Publication number Publication date
IT216529Z2 (it) 1991-09-16
IT8920951V0 (it) 1989-04-21

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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