EP1788129B1 - Dispositif pour contrôler la reserve de fil pour fournisseurs de trame - Google Patents

Dispositif pour contrôler la reserve de fil pour fournisseurs de trame Download PDF

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Publication number
EP1788129B1
EP1788129B1 EP20060019721 EP06019721A EP1788129B1 EP 1788129 B1 EP1788129 B1 EP 1788129B1 EP 20060019721 EP20060019721 EP 20060019721 EP 06019721 A EP06019721 A EP 06019721A EP 1788129 B1 EP1788129 B1 EP 1788129B1
Authority
EP
European Patent Office
Prior art keywords
weft
drum
feeler
yarn
stock
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.)
Active
Application number
EP20060019721
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German (de)
English (en)
Other versions
EP1788129A3 (fr
EP1788129A2 (fr
Inventor
Pietro Zenoni
Rosario Castelli
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.)
LGL Electronics SpA
Original Assignee
LGL Electronics 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 LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP1788129A2 publication Critical patent/EP1788129A2/fr
Publication of EP1788129A3 publication Critical patent/EP1788129A3/fr
Application granted granted Critical
Publication of EP1788129B1 publication Critical patent/EP1788129B1/fr
Active 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
    • D03D47/34—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 relates to a weft stock detector for weft feeders.
  • the weft feeders for textile machines comprise a stationary drum on which a motorized swivel arm winds a plurality of yarn loops forming a weft stock. Upon request from the loom, the loops are unwound from the drum and are fed to the loom.
  • the weft stock on the drum is controlled by a weft stock detector which is generally provided with two swinging feeler arms which are arranged at the opposite ends of the drum and are biased against the drum by springs and/or by gravity, and with a third swinging feeler arm arranged at a middle position.
  • a stock detector of this type is shown, e.g., in US-B1-6409114 .
  • Each of the feeler arms can swing between a resting position in contact with the drum and a lifted position, in relation to the presence/absence of loops on the drum in that area.
  • Photoelectric cells detect the movements of the feeler arms and are connected to send signals to a control unit which, on the basis of the received signals, pilots the rotation of the swivel arm in order to maintain the weft stock substantially constant on the drum, within the limits defined by the positions of the two outermost feeler arms.
  • the intermediate feeler arm has the aim of detecting any breaking of the yarn.
  • the yarn unwinding from the drum tends to deviate outwards, due to the centrifugal force, and to arrange along the directrices of a body of revolution commonly known as "balloon", whereby the thicker the yarn, the larger the diameter of the balloon. Consequently, when thick yarns are processed, a very large balloon forms which may bump against the feeler arms with a very high force.
  • a drawback of the known weft stock detectors is that, under the above operative conditions with thick yarns, the feeler arms tend to lift when the yarn of the balloon bumps against them, thereby altering the detections and affecting the accuracy of the control of the weft stock on the drum.
  • using springs with a higher stiffness for biasing the feeler arms against the drum would affect the operation of the detector with thin yarns, because the yarn, which is squashed between the feeler arm and the drum, could not lift the arm enough to be sensed by the photoelectric cell.
  • a weft feeder 10 for textile machines comprises a stationary drum 12 on which a swivel arm 14, which is driven by a motor 15 piloted by a control unit CU, winds a plurality of yarn loops forming a a weft reserve or stock RT.
  • yarn F is unwound from the drum, then passes through a yarn-guide eyelet 16 supported at the free end of a fixed arm 17 projecting from the motor housing parallel to the axis of the drum, and finally feeds the loom.
  • Fixed arm 17 also supports a weft stock detector 18 for controlling the weft reserve on the drum.
  • weft stock detector 18 comprises a frame 20 supporting three feeler arms 22, 24, 26 hinged to respective pins 28, 30, 32 parallel to one another. Two of said feeler arms 22, 26 are arranged near the opposite ends of the drum, while a third feeler arm 24 is arranged at a middle position.
  • Feeler arms 22, 24, 26 each comprise a U-shaped metal rod 34 whose curved end 34a is slanting at an angle with respect to the two parallel branches of the U in the running direction of the yarn, and is biased against the lateral surface of drum 12.
  • the free ends of rod 34 are attached to a connection member 36, which is fixed to a bush 38 hinged on the respective pin 32.
  • Bush 38 has a projection 40 facing away from rod 34, which incorporates a first permanent magnet 42.
  • a second permanent magnet 44 having the same polarity is supported at a fixed position within frame 20 in front of first magnet 42, upstream of the latter with respect to the the running direction of the yarn.
  • a magnetic sensor 46 is mounted on frame 20 and is arranged in such a way as to detect the movements of first magnet 42 integral with feeler arm. Magnetic sensor 46 is connected to send position signals to control unit CU, which is programmed to pilot the rotation of swivel arm 14 on the basis of the received signals, in such a way as to maintain the weft stock RT substantially constant within the limits defined by the positions of the two outermost feeler arms 22, 26.
  • the intermediate feeler arm 24 has the aim of detecting any break of the yarn.
  • the programming of control unit CU is not within the scope of the present invention because it is part of the normal knowledge of the person skilled in the art, and therefore no further description will be given about it.
  • feeler arms 22, 24, 26 each are biased against the lateral surface of drum 12 by gravity and by mutual repulsion between the magnets 42, 44, with a lever-type action about the fulcrum consisting of the axis of the pin, and can swing in relation to the absence/presence of loops on the drum, between a resting position, in which their respective ends 34a are in contact with the drum ( Fig. 1 ), and a lifted position.
  • the magnetic repulsion force is inversely proportional to the square of the distance between the magnets. As shown in Figs.
  • magnetic sensor 46 the use of which is particularly advantageous with a detector according to the invention because it exploits magnet 42 incorporated within the feeler arm, in this application has the further advantage that its operation is not affected by the powders which may generate during the unwinding of the yarn.
  • magnetic sensor 46 may be used either in place of, or together with, a traditional photoelectric cell.
  • the magnetic sensor and the photoelectric cell may be tuned in such a way as to provide two consecutive position signals in relation to the position of the feeler arm.

Landscapes

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

Claims (3)

  1. Détecteur de réserve de fil de trame pour fournisseurs de fil de trame, muni d'un tambour stationnaire (12) sur lequel sont enroulées des boucles de fil pour former une réserve de fil de trame (RT), comprenant :
    - au moins deux bras palpeurs (22, 24, 26) chacun articulé à côté du tambour autour d'un axe respectif (28, 30, 32) et pressé par une extrémité de contact respective (34a) contre la surface latérale du tambour, à l'aide d'un moyen de sollicitation respectif, pour osciller en rapport avec la présence/absence de boucles sur le tambour, et
    - des moyens de détection aménagés pour détecter les mouvements des bras palpeurs,
    caractérisé en ce que les moyens de sollicitation comprennent un premier élément magnétique (42) supporté sur le bras palpeur (34) du côté opposé à ladite extrémité de contact (34a) par rapport à l'axe (32) et un second élément magnétique (44) supporté en position fixe devant le premier élément magnétique et en relation de répulsion mutuelle avec celui-ci.
  2. Détecteur de réserve de fil de trame selon la revendication 1, caractérisé en ce que lesdits premier et second éléments magnétiques (42, 44) sont tous deux des aimants permanents d'égales polarités.
  3. Détecteur de réserve de fil de trame selon la revendication 1 ou 2, caractérisé en ce que lesdits moyens de détection, pour chacun desdits bras palpeurs, comprennent un capteur magnétique (46) aménagé de manière à détecter les mouvements du premier élément magnétique (42) monté sur le bras palpeur.
EP20060019721 2005-11-18 2006-09-21 Dispositif pour contrôler la reserve de fil pour fournisseurs de trame Active EP1788129B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20050810 ITTO20050810A1 (it) 2005-11-18 2005-11-18 Rilevatore di scorta trama per dispositivi alimentatori di trama

Publications (3)

Publication Number Publication Date
EP1788129A2 EP1788129A2 (fr) 2007-05-23
EP1788129A3 EP1788129A3 (fr) 2009-04-29
EP1788129B1 true EP1788129B1 (fr) 2010-11-03

Family

ID=37735243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060019721 Active EP1788129B1 (fr) 2005-11-18 2006-09-21 Dispositif pour contrôler la reserve de fil pour fournisseurs de trame

Country Status (4)

Country Link
EP (1) EP1788129B1 (fr)
CN (1) CN1966795B (fr)
DE (1) DE602006017953D1 (fr)
IT (1) ITTO20050810A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171516B1 (fr) * 1984-08-16 1989-03-08 Aktiebolaget Iro Dispositif pour emmagasiner et délivrer un fil
DE19639036A1 (de) * 1996-09-23 1998-03-26 Iro Ab Fadenliefergerät
DE19756243A1 (de) * 1997-12-17 1999-06-24 Iro Ab Fadenliefergerät
ITTO20040176A1 (it) * 2004-03-17 2004-06-17 Lgl Electronics Spa Alimentatore di trama per telai di tessitura con dispositivo di rilevamento della scorta

Also Published As

Publication number Publication date
EP1788129A3 (fr) 2009-04-29
CN1966795A (zh) 2007-05-23
DE602006017953D1 (de) 2010-12-16
ITTO20050810A1 (it) 2007-05-19
CN1966795B (zh) 2011-05-25
EP1788129A2 (fr) 2007-05-23

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