WO2002052081A2 - Dispositif d'acheminement d'une trame amelioree, notamment pour les metiers a jet fluide - Google Patents

Dispositif d'acheminement d'une trame amelioree, notamment pour les metiers a jet fluide Download PDF

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Publication number
WO2002052081A2
WO2002052081A2 PCT/IB2001/002283 IB0102283W WO02052081A2 WO 2002052081 A2 WO2002052081 A2 WO 2002052081A2 IB 0102283 W IB0102283 W IB 0102283W WO 02052081 A2 WO02052081 A2 WO 02052081A2
Authority
WO
WIPO (PCT)
Prior art keywords
drum
weft
supplier
loops
sector
Prior art date
Application number
PCT/IB2001/002283
Other languages
English (en)
Other versions
WO2002052081A3 (fr
Inventor
Pietro Zenoni
Giovanni Pedrini
Original Assignee
L.G.L. Electronics S.P.A.
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 L.G.L. Electronics S.P.A. filed Critical L.G.L. Electronics S.P.A.
Publication of WO2002052081A2 publication Critical patent/WO2002052081A2/fr
Publication of WO2002052081A3 publication Critical patent/WO2002052081A3/fr

Links

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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/367—Monitoring yarn quantity on the drum

Definitions

  • the present invention is concerned with an improved weft supplier particularly for fluid-jet looms.
  • weft supplying devices that, in the case of fluid-jet looms, may also act as weft pre-metering devices, is known and usual in the field of weaving.
  • Such devices when inserted between the reel and the loom, fulfill the task of supplying the yarn, or possibly a predetermined length of yarn, at each weft insertion, by releasing it from a weft stock stored in the device.
  • a system for supplying weft to looms comprises supplier devices, each comprising a stationary drum having a continuous or a multi-sector skirt, and provided with a swivel arm to wind up loops of yarn to build said weft reserve, counting means for counting the loops that are released at each weft insertion, counting means for counting the loops that are re-wound on the stationary drum in order to restore the weft reserve, and a controlling micro-controller that, according to the number of loops that have been unwound, controls the motor of the swivel arm which re-winds up the loops in order to restore the weft reserve.
  • a weft-stopper finger is associated with the drum, and is driven by electromagnetic means to release the yarn and unwind from the drum and to stop said unwinding when the pre-metered length has been reached.
  • the micro-controller processes pulse signals produced by a pair of sensors, of which the former is optical and detects the flow of the loops as they unwind from the drum, whilst the latter is magnetic and provides signals depending on the rotation of the swivel arm, generated by detecting the passage of a magnet which is attached to the swivel arm.
  • the first optical sensor includes a photoelectric cell receiving a light beam generated by a source placed adjacent to the drum and reflected by the drum skirt or by the drum sectors.
  • the passage of an unwinding loop temporarily interrupts said beam and dims the photoelectric cell, thereby causing the photocell to generate a corresponding signal signaling the passage of the loop.
  • the skirt or the sectors of the drum of the supplying device is coated, by way of surface hardening, with a thin chrome layer, of a thickness typically in the range of ten to twenty microns.
  • Such chrome layer when suitably polished at least in the incidence area of said light beam, can also serve as an excellent reflective surface for the beam.
  • drums or drum sectors treated treated so that their surface has a considerably higher hardness it is common to use drums or drum sectors treated treated so that their surface has a considerably higher hardness. Typically, this is achieved by depositing a superficial plasma layer. However, the plasma layer imparts the treated surface a roughness which it is unfeasible to remove, and the treated surface consequently no longer has the capability to reflect the light beam impinging on the photoelectric cell of the first sensor.
  • the main object of this invention is to provide an improved weft supplier where the above stated drawback is removed, i.e. where the reflection of the light beam is achieved independently of the characteristics of the superficial layer of the drum.
  • a reflective movable member which preferably consists of a mirror-polished metal plate.
  • a plate is set in a corresponding seat provided on said drum skirt or drum sectors, the seat being depressed so that the plate is level with the outside surface of said drum skirt or sectors.
  • said plate is provided with a centering tang and is bonded to its seat by an interposed layer of an adhesive.
  • Fig. 1 is a partial side view of the fore end of a weft supplier/pre-meter for fluid-jet looms
  • Fig. 2 is a detail, to an enlarged scale, of Fig. 1;
  • Fig. 3 is a perspective view of a drum sector of the supplier of Fig.l, having a reflective movable member, according with the invention.
  • Fig. 1 shows a supplier-premeter P comprising a stationary drum TA, consisting of a plurality of side-by-side sectors ST, on which a swivel arm BR, operated by an electric motor (not shown), winds a plurality of loops of yarn F to build a weft stock RT.
  • a weft-stopper finger DI (Fig. 2) for stopping yarn F is connected to drum TA and is driven by an electromagnetic actuator AE to release yarn F so that it will unwind from the drum, and to stop said unwinding when a predetermined length has been reached.
  • a light source S projecting a light beam r towards adjacent sector ST of drum TA, and a photoelectric cell CF, receiving the light beam after reflection on said adjacent sector, are arranged by actuator AE and adjacent drum TA: source SL and cell CF provide an optical sensor for detecting the loops unwinding from drum TA.
  • adjacent sector ST is provided with a reflective movable member ER which preferably consists of a mirror-polished metal plate.
  • a reflective movable member ER which preferably consists of a mirror-polished metal plate.
  • a plate is set in a corresponding seat SR, which is made on said adjacent sector, said seat being depressed so that the plate is level with the external surface of said sector.
  • said plate ER is provided with a centering tang CC and is bonded to its seat by means of an interposed layer of adhesive.

Landscapes

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

Abstract

L'invention se rapporte à un dispositif d'acheminement d'une trame comprenant un tambour stationnaire (TA) recouvert d'un revêtement non réfléchissant à des fins de durcissement en surface, un bras amovible (BR) destiné à enrouler une pluralité de boucles de fils de trame (F) sur le tambour (TA) afin d'obtenir une pile de trame (RT). Pour compter les boucles libérées à chaque insertion de trame, une source lumineuse (SL) génère un faisceau lumineux (r) reçu par une cellule photoélectrique (CF) après réflexion sur une plaque métallique polie comme un miroir (ER) se trouvant dans la surface externe dudit tambour (TA).
PCT/IB2001/002283 2000-12-22 2001-12-03 Dispositif d'acheminement d'une trame amelioree, notamment pour les metiers a jet fluide WO2002052081A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITT02000U000222 2000-12-22
IT2000TO000222 IT249345Y1 (it) 2000-12-22 2000-12-22 Alimentatore di trama perfezionato, particolarmente per telai di tessitura a getto di fluido.

Publications (2)

Publication Number Publication Date
WO2002052081A2 true WO2002052081A2 (fr) 2002-07-04
WO2002052081A3 WO2002052081A3 (fr) 2003-08-28

Family

ID=11457559

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/002283 WO2002052081A2 (fr) 2000-12-22 2001-12-03 Dispositif d'acheminement d'une trame amelioree, notamment pour les metiers a jet fluide

Country Status (2)

Country Link
IT (1) IT249345Y1 (fr)
WO (1) WO2002052081A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005100221A1 (fr) * 2004-04-15 2005-10-27 Iro Ab Dispositif d'alimentation en fil
WO2005102892A1 (fr) * 2004-04-21 2005-11-03 Iro Ab Passe-fil
CN103282566A (zh) * 2010-12-23 2013-09-04 罗伊有限公司 织布机供纬机构中的反射光学传感器组
EP3620561A1 (fr) 2018-09-07 2020-03-11 ROJ S.r.l. Capteur optique de réflexion de fil de trame dans un alimenteur de trame de tissage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0327973A1 (fr) * 1988-02-11 1989-08-16 ROJ ELECTROTEX S.p.A. Dispositif d'alimentation en fil
EP0811573A2 (fr) * 1996-06-03 1997-12-10 Iro Ab Fournisseur de fil
US6095200A (en) * 1996-04-01 2000-08-01 Iro Ab Opto-electronic sensor device for a yarn feeder
WO2000048934A1 (fr) * 1999-02-19 2000-08-24 Iro Patent Ag Detecteur de fil optoelectronique ou detecteur optoelectronique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0327973A1 (fr) * 1988-02-11 1989-08-16 ROJ ELECTROTEX S.p.A. Dispositif d'alimentation en fil
US6095200A (en) * 1996-04-01 2000-08-01 Iro Ab Opto-electronic sensor device for a yarn feeder
EP0811573A2 (fr) * 1996-06-03 1997-12-10 Iro Ab Fournisseur de fil
WO2000048934A1 (fr) * 1999-02-19 2000-08-24 Iro Patent Ag Detecteur de fil optoelectronique ou detecteur optoelectronique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005100221A1 (fr) * 2004-04-15 2005-10-27 Iro Ab Dispositif d'alimentation en fil
CN100567116C (zh) * 2004-04-15 2009-12-09 Iro有限公司 喂纱设备
WO2005102892A1 (fr) * 2004-04-21 2005-11-03 Iro Ab Passe-fil
CN103282566A (zh) * 2010-12-23 2013-09-04 罗伊有限公司 织布机供纬机构中的反射光学传感器组
EP3620561A1 (fr) 2018-09-07 2020-03-11 ROJ S.r.l. Capteur optique de réflexion de fil de trame dans un alimenteur de trame de tissage
JP2020041251A (ja) * 2018-09-07 2020-03-19 ロイ エス．アール．エル．Ｒｏｊ Ｓ．Ｒ．Ｌ． 製織用緯糸フィーダ内の緯糸反射型光学センサ
EP3620561B1 (fr) * 2018-09-07 2021-05-05 ROJ S.r.l. Capteur optique de réflexion de fil de trame dans un alimenteur de trame de tissage
JP7353869B2 (ja) 2018-09-07 2023-10-02 ロイ エス．アール．エル． 緯糸反射型光学センサを備える製織用緯糸フィーダ

Also Published As

Publication number Publication date
ITTO20000222V0 (it) 2000-12-22
WO2002052081A3 (fr) 2003-08-28
ITTO20000222U1 (it) 2002-06-22
IT249345Y1 (it) 2003-04-14

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