EP2186932B1 - Fadenliefervorrichtung für Textilmaschinen mit Steuerung der Zuführungsparameter - Google Patents

Fadenliefervorrichtung für Textilmaschinen mit Steuerung der Zuführungsparameter Download PDF

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Publication number
EP2186932B1
EP2186932B1 EP20080425726 EP08425726A EP2186932B1 EP 2186932 B1 EP2186932 B1 EP 2186932B1 EP 20080425726 EP20080425726 EP 20080425726 EP 08425726 A EP08425726 A EP 08425726A EP 2186932 B1 EP2186932 B1 EP 2186932B1
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EP
European Patent Office
Prior art keywords
yam
yarn
consumption
sensor
drum
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EP20080425726
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English (en)
French (fr)
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EP2186932A1 (de
Inventor
Pietro Zenoni
Giovanni Pedrini
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LGL Electronics SpA
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LGL Electronics SpA
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Priority to EP20080425726 priority Critical patent/EP2186932B1/de
Priority to CN 200910224569 priority patent/CN101736503B/zh
Publication of EP2186932A1 publication Critical patent/EP2186932A1/de
Application granted granted Critical
Publication of EP2186932B1 publication Critical patent/EP2186932B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/488—Thread-feeding devices in co-operation with stitch-length-regulating mechanism

Definitions

  • the present invention relates to a yarn-feeding apparatus for textile machines, particularly knitting machines, with control of the main feeding parameters.
  • tension sensors are used for measuring/controlling the tension of the yarn fed to the machine in order to maintain it substantially constant.
  • a signal indicative of the yarn-feeding speed which is calculated on the basis of the speed of rotation and of the diameter of the yarn-winding drum, is transmitted to the control unit of the machine; the control unit adjusts the stitches as a function this speed in such a way as to compensate the difference between the yarn-feeding speed and the yarn-drawing speed.
  • a yarn feeding apparatus 10 in which a yarn 12 is drawn from a reel 14 and is fed to a conventional textile machine, preferably a knitting machine 16, via a yarn feeder 18 of a known type provided with a stationary drum.
  • a feeder of the above type is described, e.g., in EP 707 102 of Applicant, and comprises a stationary drum 20 on which a flywheel 22 driven by a motor 24 winds a plurality of yarn loops forming a weft stock 26. Upon request from machine 16, the loops are unwound from drum 20 and are fed to the machine.
  • Feeder 18 is also provided with braking means comprising a frustoconical, hollow braking member 28 which is coaxially arranged with its larger base in front of stationary drum 20 and is biased with its inner surface against the delivery edge of the drum by actuator means 30.
  • the yarn delivered by feeder 18 is pressed between the delivery edge of drum 20 and braking member 28, whereby it is subjected to a braking action by friction.
  • Actuator means 30 are controlled by a feeder control unit 32 which receives a tension signal TS from a tension sensor 33 arranged along the path of the yarn and, on the basis of it, applies a braking signal BS to actuator means 30, which signal is modulated in such a way as to maintain the yarn tension substantially constant.
  • Yarn feeder 18 is also provided with a sensor 34 for continuously measuring the yarn consumption, preferably a piezoelectric sensor connected as described in EP 1 335 054 of Applicant. Alternatively, an optical sensor as described in EP 0 327 973 could be used.
  • the term “consumption” or "speed” is intended to define the amount of yarn delivered from the drum over time.
  • the signal transmitted by sensor 34 which typically is a pulse signal PS, is processed by control unit 32 in order to calculate the exact number of loops and portions of loop which are unwound from the drum, thereby generating a very accurate comsumption signal YC.
  • Consumption signal YC is transmitted to a machine control unit 36 programmed to compare the measured consumption with a predetermined consumption range and to adjust the stitches (not shown) as a function of the difference between these two values.
  • yarn 12 is fed to machine 16 via feeder 24, with a tension which is maintained substantially constant by the modulated braking action applied by braking member 28. If the braking action applied by braking member 28 causes yarn 12, whose speed is measured by sensor 34, to slow down below the consumption range set on the downstream machine 16, machine control unit 36 adjusts the stitches in such a way as to compensate the difference between these two values.
  • apparatus 10 allows the tension of yarn 12 to be controlled, and the stitches to be adjusted, very accurately, by using a yarn feeder 18 of the type provided with a stationary drum and with braking means operated in such a way as to control the tension of the yarn without directly influencing the yarn-feeding speed. This leads to less frequent interventions of the loop compensating the variations of speed and, consequently, to reduced wear of the mechanisms which adjust the stitches.
  • the apparatus according to the invention is not subjected to the drawbacks deriving from the use of feeders having a rotating drum, with which, as mentioned above, the quickness of response of the system is affected by the inertia of the yarn-winding drum and by the adjusting criterion that is adopted.
  • the apparatus according to the invention makes use of a very accurate consumption-measuring system, which also enhances the accuracy of the loop compensating the variations of speed.
  • Fig. 2 shows a second embodiment of the invention, in which the corresponding or similar parts are referred to by the same reference numbers.
  • yarn 12 is braked downstream of yarn consumption sensor 34, e.g., by a brake 128 of the type described in EP 1 072 707 , wherein the yarn is braked by friction between a pressure member operated by a motor and a stationary base.
  • a brake 128 of the type described in EP 1 072 707 wherein the yarn is braked by friction between a pressure member operated by a motor and a stationary base.
  • the braking means used in either the first or the second embodiment my be of different types, e.g., in the case of the first embodiment, metal foil brakes, brush brakes, and the like could be used, while, in the case of the second embodiment, swinging arm brakes could be used, as well known to the person skilled in the art.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Knitting Machines (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)

Claims (8)

  1. Fadenliefervorrichtung für eine Textilmaschine (16) mit einstellbaren Maschen, dadurch gekennzeichnet, dass sie aufweist:
    - einen Garnzuführer (18), der mit einer stationären Garnwickeltrommel (20) versehen ist, von der auf Anforderung einer Textilmaschine (16) Garnschlaufen abgewickelt werden,
    - eine Bremseinrichtung (28, 128), die dazu gesteuert ist, durch Reibung auf das sich abwickelnde Garn eine Bremswirkung aufzubringen, um die Garnspannung im Wesentlichen konstant zu halten,
    - einen Garnverbrauchssensor (34), der zum fortwährenden Messen des tatsächlichen Garnverbrauchs und zum Erzeugen eines entsprechenden, den Verbrauch angebenden Impulssignals (PS) angeordnet ist, und
    - eine Verarbeitungseinrichtung (32, 36), die dazu programmiert ist, das Impulssignal (PS) zum Berechnen der genauen Anzahl von der Trommel abgewickelter Schlaufen und Schlaufenabschnitte und zum Ermitteln eines entsprechenden Verbrauchssignals (YC) zu verarbeiten, das Verbrauchssignal (YC) mit einem vorbestimmten Verbrauchsbereich zu vergleichen und die Maschen in Abhängigkeit der Differenz zwischen den zwei Werten einzustellen.
  2. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die Bremseinrichtung (28, 128) auf der Basis eines Zugspannungssignals (TS) gesteuert ist, welches von einem längs des Gamweges angeordneten Zugspannungssensor (33) übertragen wird.
  3. Vorrichtung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass die Bremseinrichtung (28) stromaufwärts des Garnverbrauchssensors (34) so angeordnet ist, dass sie das sich abwickelnde Garn gegen die Trommel drückt.
  4. Vorrichtung nach Anspruch 3,
    dadurch gekennzeichnet, dass die Bremseinrichtung ein kegelstumpfförmiges, hohles Bremsbauteil (28) aufweist, das mit seiner größeren Grundfläche vor und koaxial zur Trommel (20) angeordnet und mit seiner Innenfläche gegen den Zuführrand der Trommel gespannt ist.
  5. Vorrichtung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass die Bremseinrichtung (128) stromabwärts des Garnverbrauchssensors (34) so angeordnet ist, dass sie das sich abwickelnde Garn zwischen ein motorbetädgtes Druckglied und eine stationäre Basis drückt.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass der Garnverbrauchssensor (34) ein piezoelektrischer Sensor ist.
  7. Vorrichtung nach einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass der Garnverbrauchssensor (34) ein optischer Sensor ist.
  8. Vorrichtung nach Anspruch 6 oder 7,
    dadurch gekennzeichnet, dass die Verarbeitungseinrichtung eine fest zugeordnete Steuereinheit (32) des Zuführers umfasst.
EP20080425726 2008-11-13 2008-11-13 Fadenliefervorrichtung für Textilmaschinen mit Steuerung der Zuführungsparameter Active EP2186932B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20080425726 EP2186932B1 (de) 2008-11-13 2008-11-13 Fadenliefervorrichtung für Textilmaschinen mit Steuerung der Zuführungsparameter
CN 200910224569 CN101736503B (zh) 2008-11-13 2009-11-12 可控制喂纱参数的用于纺织机的喂纱设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20080425726 EP2186932B1 (de) 2008-11-13 2008-11-13 Fadenliefervorrichtung für Textilmaschinen mit Steuerung der Zuführungsparameter

Publications (2)

Publication Number Publication Date
EP2186932A1 EP2186932A1 (de) 2010-05-19
EP2186932B1 true EP2186932B1 (de) 2012-09-19

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EP (1) EP2186932B1 (de)
CN (1) CN101736503B (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2415916B1 (de) * 2010-08-04 2015-03-04 L.G.L. Electronics S.p.A. Verfahren und Vorrichtung zur Erkennung unbeabsichtigten Anhaltens des Garns auf einer Fertigungsstrasse für Strickwaren
ITMI20111030A1 (it) 2011-06-08 2012-12-09 Santoni & C Spa Procedimento per regolare la taglia di articoli tessili in produzione su macchine tessili circolari per maglieria o calzetteria
ITTO20120261A1 (it) * 2012-03-22 2013-09-23 Lgl Electronics Spa Metodo di alimentazione/recupero del filato per macchine tessili, ed apparato per l'esecuzione di tale metodo.
ITTO20130017A1 (it) * 2013-01-10 2014-07-11 Lgl Electronics Spa Gruppo di alimentazione di filato per macchine tessili.
IT201700113434A1 (it) * 2017-10-10 2019-04-10 Lgl Electronics Spa Metodo di controllo del consumo di filato in un processo di tessitura
IT201900011448A1 (it) * 2019-07-11 2021-01-11 Lgl Electronics Spa Metodo per l'alimentazione di una pluralita' di filati ad una macchina tessile mediante rispettivi alimentatori di filato positivi

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858416A (en) * 1973-07-23 1975-01-07 Eugene F White Knitting machine yarn feeding apparatus
IT1217339B (it) 1988-02-11 1990-03-22 Roy Electrotex Spa Alimentatore di filo per macchine tessili
JP2892392B2 (ja) * 1989-08-31 1999-05-17 株式会社福原精機製作所 編機のステッチ自動調整装置および方法
IT1268111B1 (it) 1994-10-10 1997-02-20 Lgl Electronics Spa Dispositivo di frenatura modulata positiva del filato, per apparecchi alimentatori di trama
IT1303022B1 (it) 1998-04-17 2000-10-20 Btsr Int Spa Dispositivo di controllo dell'alimentazione del filato ad una macchinatessile e metodo di controllo del funzionamento e produzione di
IT1308066B1 (it) 1999-06-01 2001-11-29 Lgl Electronics Spa Dispositivo di comando di frenatrama, particolarmente per telaidi tessitura e simili
ITTO20020075A1 (it) 2002-01-28 2003-07-28 Lgl Electronics Spa ,,metodo e dispositivo di misura del consumo del filo di trama inserito a mezzo di alimentatori di trama nelle macchine tessili; specialment
DE502004012221D1 (de) * 2004-04-03 2011-04-07 Stoll H Gmbh & Co Kg Vorrichtung zur Lieferung einer Fadenmenge

Also Published As

Publication number Publication date
CN101736503A (zh) 2010-06-16
CN101736503B (zh) 2013-10-23
EP2186932A1 (de) 2010-05-19

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