EP3103749A1 - Verfahren zur steuerung der abnutzungsrate eines garns, der von einem anhäufungszuführer an eine textilmaschine abgewickelt wird, und vorrichtung zur ausführung solch eines verfahrens - Google Patents

Verfahren zur steuerung der abnutzungsrate eines garns, der von einem anhäufungszuführer an eine textilmaschine abgewickelt wird, und vorrichtung zur ausführung solch eines verfahrens Download PDF

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Publication number
EP3103749A1
EP3103749A1 EP16172795.3A EP16172795A EP3103749A1 EP 3103749 A1 EP3103749 A1 EP 3103749A1 EP 16172795 A EP16172795 A EP 16172795A EP 3103749 A1 EP3103749 A1 EP 3103749A1
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EP
European Patent Office
Prior art keywords
ref
tension
yarn
rate
meas
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Granted
Application number
EP16172795.3A
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English (en)
French (fr)
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EP3103749B1 (de
Inventor
Pietro Zenoni
Giovanni Pedrini
Luca Gotti
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LGL Electronics SpA
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LGL Electronics SpA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • 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
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/12—Indicating, warning, or safety devices, e.g. stop motions responsive to thread consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a method for controlling the consumption rate (m/sec) of a yarn being unwound from an accumulation feeder toward a textile machine, particularly a circular knitting machine, and an apparatus for carrying out such method.
  • a generic circular knitting machine can be fed by a plurality of yarns that are unwound from respective yarn feeders known as "accumulator feeders".
  • a generic accumulator yarn feeder comprises a drum on which winding means wind a plurality of yarn loops which form a reserve.
  • winding means can consist of a motorized flywheel that winds the yarn on the drum, or the drum proper can be rotated in order to wind the yarn onto it.
  • the yarn is taken from a distaff upstream and passed on to the textile machine downstream on request therefrom.
  • EP2031106B1 discloses how to control the yarn tension being unwound from the drum so as to keep it substantially constant.
  • a tension sensor arranged downstream of the feeder detects the yarn tension and sends it to a control unit.
  • the control unit drives, in feedback, means for braking the yarn so as to stabilize the tension on a preset value.
  • the aim of the present invention is to provide a method for controlling the consumption rate of a yarn being unwound from an accumulation feeder toward a textile machine, which can be adopted practically and economically, including on existing knitting machines without adjustment of the knit triangles, in particular, large-diameter knitting machines and machines for stockings, as well as to provide an apparatus for carrying out such method.
  • the quantity of reserve on the drum 12 is controlled by a triplet of sensors.
  • a first sensor S1 preferably a Hall probe, detects the passage of magnets like M which are integral with the flywheel 14 in order to determine the quantity of yarn wound on the drum and the winding speed.
  • a weft braking device 20 Arranged downstream of the weft feeder 10 is a weft braking device 20 driven by a control unit CU which is programmed to stabilize the yarn tension being unwound from the drum 12 on a preset value by way of a feedback control loop.
  • a tension sensor 22 which is adapted to measure the tension of the yarn F being unwound from the drum and to generate a corresponding measured tension signal T meas.
  • the control unit CU comprises a tension control block CT which is programmed to compare the measured tension signal T_meas with a reference tension T_ref which represents the desired tension, and consequently generate a braking signal BI for the weft braking device 20 which is such as to minimize the difference between the measured tension and the reference tension.
  • the feeder 10 receives a pulse UWP from the sensor S3 for each turn unwound from the drum 12. Since the yarn drawing rate at a given rotation speed of the downstream machine is almost constant, under normal conditions the intervals between successive pulses will vary only to a negligible extent. But if the time elapsed since the most recent pulse appreciably exceeds the average interval, then the machine will shut down as this points to the possibility that the weft has undergone an accidental stoppage, either owing to the breakage of the yarn or owing to the loss of the yarn by the needles of the machine 17. For more details on such system for detecting accidental stoppages of the yarn, which lies outside the aims and objects of the present invention, reference is made to EP2031106B1 .
  • the consumption rate YS_meas can be advantageously calculated as the average of the unwinding speeds of the yarns by the respective feeders.
  • such unwinding speed can be calculated by a speed evaluation block SE as a function of the UWP pulses originating from the third sensor S3.
  • the maximum allowable error YS_err which delimits, in modulus, the ends of the interval of error is established in percentage terms, e.g., 5-10%, but it could also be established in terms of difference.
  • the comparison between the consumption rate YS_meas and the reference rate YS_ref is carried out in a speed regulator block YSR, which consequently generates an output signal YSR_out.
  • Such output signal YSR_out is sent to the input of the reference tension T_ref of the tension control block CT by way of a switch YSRS.
  • the latter is closed only when the difference between the measured consumption rate YS meas and the reference rate YSref falls within the predefined error range, by way of a reactivation signal YSRS_en which is generated by the speed regulator block YSR.
  • the adjustment range of the reference tension is delimited between two preset maximum values, YS_T_ref_min and YS_T_ref_max.
  • the method comprises an alarm procedure that stops the machine if the feed under limit tension conditions (YS_T_ref_min or YS_T_ref_max) lasts more than a preset maximum time.
  • the method comprises a further alarm procedure that stops the machine if the consumption rate YS_meas does not converge to a value close to the reference rate YS_ref within a preset maximum time.
  • the reference tension T_ref in steps in which the machine operates with variable consumption, preferably corresponds to the most recent output signal YSR_out set by the speed regulator block YSR.
  • the reference tension T_ref could be set to a fixed value chosen by the user.
  • weft braking device 20 could be locked on the most recent adjusted position of the tension controller CT.
  • the reference rate YS_ref is advantageously calculated by way of a calibration procedure that comprises the following steps:
  • the speed of the machine is provided to the control unit CU by way of the bus 30.
  • the yarn consumption rate of the i-th feeder Y_meas_i can be calculated on the basis of the pulses generated by the first sensor S1 instead of by the third sensor S3, assuming that, during operation at constant speed, the quantity of yarn unwound from the drum is equal to the quantity of yarn wound on the drum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Looms (AREA)
EP16172795.3A 2015-06-12 2016-06-03 Verfahren zur steuerung der abnutzungsrate eines garns, der von einem anhäufungszuführer an eine textilmaschine abgewickelt wird, und vorrichtung zur ausführung eines solchen verfahrens Active EP3103749B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB20151048 2015-06-12

Publications (2)

Publication Number Publication Date
EP3103749A1 true EP3103749A1 (de) 2016-12-14
EP3103749B1 EP3103749B1 (de) 2019-12-04

Family

ID=54199914

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EP16172795.3A Active EP3103749B1 (de) 2015-06-12 2016-06-03 Verfahren zur steuerung der abnutzungsrate eines garns, der von einem anhäufungszuführer an eine textilmaschine abgewickelt wird, und vorrichtung zur ausführung eines solchen verfahrens

Country Status (2)

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EP (1) EP3103749B1 (de)
CN (1) CN106245212B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700113434A1 (it) * 2017-10-10 2019-04-10 Lgl Electronics Spa Metodo di controllo del consumo di filato in un processo di tessitura
TWI694190B (zh) * 2019-03-14 2020-05-21 佰龍機械廠股份有限公司 圓編機自動調校的布樣文件發佈系統
CN111470379A (zh) * 2020-04-17 2020-07-31 李小琴 用于纺织机械的消极式送纱器
CN109626126B (zh) * 2019-01-22 2020-10-16 江苏恒力化纤股份有限公司 一种通过测试长丝张力以控制丝卷卷绕超喂率的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10234545A1 (de) * 2002-07-30 2004-02-19 Memminger-Iro Gmbh Verfahren und Vorrichtung zum Liefern von Fäden
EP2031106A1 (de) * 2007-08-31 2009-03-04 L.G.L. Electronics S.p.A. Verfahren zur Spannungskontrolle eines Garnes, das von einem negativen Liefergerät an eine Textilmaschine geliefert wird, und Vorrichtung zur Durchführung des Verfahrens
WO2011144987A2 (en) * 2010-05-18 2011-11-24 B.T.S.R. International S.P.A. Improved method and device for feeding a yarn or thread to a processing machine with constant tension and velocity
WO2013045982A1 (en) * 2011-06-08 2013-04-04 Btsr International S.P.A. Method and device for feeding a thread to a textile machine with constant tension and constant velocity or quantity

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005067791A (ja) * 2003-08-22 2005-03-17 Asahi Kasei Fibers Corp 弾性糸の連続供給方法
JP6086882B2 (ja) * 2013-10-31 2017-03-01 株式会社島精機製作所 糸供給システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10234545A1 (de) * 2002-07-30 2004-02-19 Memminger-Iro Gmbh Verfahren und Vorrichtung zum Liefern von Fäden
EP2031106A1 (de) * 2007-08-31 2009-03-04 L.G.L. Electronics S.p.A. Verfahren zur Spannungskontrolle eines Garnes, das von einem negativen Liefergerät an eine Textilmaschine geliefert wird, und Vorrichtung zur Durchführung des Verfahrens
EP2031106B1 (de) 2007-08-31 2010-02-24 L.G.L. Electronics S.p.A. Verfahren zur Spannungskontrolle eines Garnes, das von einem negativen Liefergerät an eine Textilmaschine geliefert wird, und Vorrichtung zur Durchführung des Verfahrens
WO2011144987A2 (en) * 2010-05-18 2011-11-24 B.T.S.R. International S.P.A. Improved method and device for feeding a yarn or thread to a processing machine with constant tension and velocity
WO2013045982A1 (en) * 2011-06-08 2013-04-04 Btsr International S.P.A. Method and device for feeding a thread to a textile machine with constant tension and constant velocity or quantity

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700113434A1 (it) * 2017-10-10 2019-04-10 Lgl Electronics Spa Metodo di controllo del consumo di filato in un processo di tessitura
EP3470564A1 (de) * 2017-10-10 2019-04-17 L.G.L. Electronics S.p.A. Verfahren zur steuerung des verbrauchs von garn in einem textilfertigungsverfahren
US10662557B2 (en) 2017-10-10 2020-05-26 L.G.L. Electronics S.P.A. Method for controlling the consumption of yarn in a weaving process
CN109626126B (zh) * 2019-01-22 2020-10-16 江苏恒力化纤股份有限公司 一种通过测试长丝张力以控制丝卷卷绕超喂率的方法
TWI694190B (zh) * 2019-03-14 2020-05-21 佰龍機械廠股份有限公司 圓編機自動調校的布樣文件發佈系統
CN111470379A (zh) * 2020-04-17 2020-07-31 李小琴 用于纺织机械的消极式送纱器

Also Published As

Publication number Publication date
EP3103749B1 (de) 2019-12-04
CN106245212A (zh) 2016-12-21
CN106245212B (zh) 2021-02-12

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