EP3103749B1 - Procédé pour commander le taux de consommation d'un fil déroulé à partir d'un dispositif d'alimentation à accumulation vers une machine textile et appareil permettant de mettre en oeuvre ce procédé - Google Patents

Procédé pour commander le taux de consommation d'un fil déroulé à partir d'un dispositif d'alimentation à accumulation vers une machine textile et appareil permettant de mettre en oeuvre ce procédé Download PDF

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EP3103749B1
EP3103749B1 EP16172795.3A EP16172795A EP3103749B1 EP 3103749 B1 EP3103749 B1 EP 3103749B1 EP 16172795 A EP16172795 A EP 16172795A EP 3103749 B1 EP3103749 B1 EP 3103749B1
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Prior art keywords
ref
yarn
tension
rate
meas
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German (de)
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EP3103749A1 (fr
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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.
  • WO 2013/045982 A1 discloses a method for controlling the yarn consumption quantity, on the basis of the interaction between a tension control loop and a speed control loop.
  • the yarn consumption quantity is measured by a dedicated velocity sensor positioned in proximity to the yarn processing point or zone of the textile machine.
  • 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.
  • Fig. 1 is a schematic diagram of a textile machine that receives yarn from an accumulation feeder by way of the method according to the invention.
  • a weft feeder 10 for textile machines comprises a fixed drum 12 and a flywheel 14, which is driven by a motor 15 in order to take yarn F from a distaff 16 and wind it on the drum 12 in the form of loops which form a reserve.
  • the yarn F is unwound from the drum 12 on request from a generic textile machine downstream, advantageously a circular knitting machine 17.
  • 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.
  • control unit CU of the feeder is connected to the knitting machine 17 by way of a bus 30 for the mutual exchange of information such as the speed of the machine, alarms, statuses, and setting of parameters.
  • 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 .
  • control of the consumption rate is disabled in the steps in which the machine operates with variable consumption, in order to make complex patterns (when control of the consumption rate is substantially irrelevant), and it is re-enabled when the machine operates with constant consumption in order to produce smooth knits (when control of the consumption rate is essential in order to prevent "stripes" in the finished garment, or size discrepancies).
  • 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 is 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 YS_ref 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.

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

Claims (10)

  1. Procédé pour commander le taux de consommation d'un fil dévidé à partir d'un délivreur d'accumulation vers une machine à textile, dans lequel la tension de fil est stabilisée à une tension de référence (T_ref) par un dispositif de freinage de trame (20) entraîné par une unité de commande (CU) qui reçoit un signal de tension mesurée (T_meas) provenant d'un capteur de tension (22),
    caractérisé en ce qu'il comporte les étapes consistant à :
    - mesurer en continu le taux de consommation de fil (YS_meas),
    - comparer en continu ledit taux de consommation de fil (YS_meas) à un taux de référence (YS_ref),
    - si la différence entre ledit taux de consommation de fil (YS_meas) et ledit taux de référence (YS_ref) se situe dans les limites d'une plage d'erreur préétablie qui indique que la machine fonctionne avec une consommation constante, alors régler ladite tension de référence (T_ref) de manière à minimiser la différence entre ledit taux de consommation de fil (YS_meas) et ledit taux de référence (YS_ref), sinon désactiver ledit réglage de la tension de référence (T_ref), ledit taux de consommation de fil étant calculé par un bloc d'évaluation de vitesse (SE) en fonction d'impulsions provenant d'un capteur (S3) agencé sur le délivreur d'accumulation et générer une impulsion (UWP) pour chaque boucle de fil dévidée.
  2. Procédé selon la revendication 1, caractérisé en ce que le réglage de ladite tension de référence (T_ref) est délimité entre deux valeurs maximales préétablies (YS_T_ref_min, YS_T_ref_max).
  3. Procédé selon la revendication 2, caractérisé en ce que la machine est arrêtée si l'alimentation avec des conditions de tension égales à l'une desdites valeurs maximales préétablies dure plus qu'un temps maximal préétabli.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que ladite machine est arrêtée si le taux de consommation de fil (YS_meas) ne converge pas vers une valeur proche du taux de référence (YS_ref) dans les limites d'un temps maximal préétabli.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que lorsque le réglage de la tension de référence (T_ref) est désactivé, la tension de référence (T_ref) est réglée à une valeur fixe qui correspond à la valeur de tension réglée la plus récente.
  6. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que lorsque le réglage de la tension de référence (T_ref) est désactivé, la tension de référence (T_ref) est réglée à une valeur fixe choisie par l'utilisateur.
  7. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que lorsque le réglage de la tension de référence (T_ref) est désactivé, le dispositif de freinage de trame (20) est bloqué sur la position réglée la plus récente.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que ledit taux de référence (YS_ref) est calculé au moyen d'une procédure d'étalonnage qui comporte les étapes suivantes consistant à :
    - désactiver ledit réglage de la tension de référence (T_ref),
    - régler la même tension de référence (T_ref) sur chacun des délivreurs qui alimentent ladite machine à textile (17),
    - démarrer la machine à textile (17) dans une partie dans laquelle elle fonctionne avec une consommation constante,
    - demander à chacun des délivreurs de fil le taux de dévidage de fil (Y_meas_i) respectif,
    - calculer ledit taux de référence (YS_ref) comme la moyenne arithmétique des taux de dévidage de fil de tous les délivreurs.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que ledit taux de référence (YS_ref) est mis à jour en continu en fonction de la vitesse de la machine, au moyen de la formule : YS _ ref _ upd = Y _ ref _ nom * V _ mach / V _ mach _ nom
    Figure imgb0004
     où YS_ref_upd est le taux de référence mis à jour, Y_ref_nom est un taux de référence nominal, V_mach est une vitesse mesurée de la machine et V_mach_nom est une vitesse nominale de la machine.
  10. Délivreur d'accumulation incluant au moins un capteur (S3) et un appareil pour commander le taux de consommation d'un fil dévidé à partir du délivreur d'accumulation (10) vers une machine à textile (17), l'appareil comportant un dispositif de freinage de trame (20) qui est entraîné par un bloc de commande de tension (TC) qui est programmé pour stabiliser la tension de fil (T_meas), qui est mesurée par un capteur de tension (22), à une tension de référence (T_ref), caractérisé en ce qu'il comporte :
    - un bloc d'évaluation de vitesse (SE) configuré pour un calcul continu du taux de consommation (YS_meas),
    - un bloc de régulation de vitesse (YSR) qui est adapté pour comparer en continu ledit taux de consommation de fil (YS_meas) à un taux de référence (YS_ref) et pour générer en conséquence un signal de sortie (YSR_out), pour l'entrée de la tension de référence (T_ref) dudit bloc de commande de tension (TC), qui est adapté pour minimiser la différence entre les taux,
    un commutateur (YSRS) intercalé entre ledit signal de sortie (YSR_out) et ladite entrée de la tension de référence (T_ref), qui est commandé pour se fermer uniquement lorsque la différence entre le taux de consommation de fil (YS_meas) et le taux de référence (YS_ref) se situe dans les limites d'une plage d'erreur préétablie, qui indique le fait que la machine fonctionne avec une consommation constante, dans lequel ledit bloc d'évaluation de vitesse (SE) est configuré pour calculer le taux de consommation de fil (YS_meas) en fonction d'impulsions provenant du capteur (S3) agencé sur le délivreur d'accumulation et générer une impulsion (UWP) pour chaque boucle de fil dévidée.
EP16172795.3A 2015-06-12 2016-06-03 Procédé pour commander le taux de consommation d'un fil déroulé à partir d'un dispositif d'alimentation à accumulation vers une machine textile et appareil permettant de mettre en oeuvre ce procédé Active EP3103749B1 (fr)

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EP3103749B1 true EP3103749B1 (fr) 2019-12-04

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* 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
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
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
CN111470379A (zh) * 2020-04-17 2020-07-31 李小琴 用于纺织机械的消极式送纱器

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DE10234545B4 (de) * 2002-07-30 2005-12-15 Memminger-Iro Gmbh Verfahren und Vorrichtung zum Liefern von Fäden
JP2005067791A (ja) * 2003-08-22 2005-03-17 Asahi Kasei Fibers Corp 弾性糸の連続供給方法
EP2031106B1 (fr) * 2007-08-31 2010-02-24 L.G.L. Electronics S.p.A. Procédé de controle de tension d'un fil délivré par un fournisseur négatif vers une machine textile, et dispositif permettant de mettre en oeuvre le procédé
ITMI20100887A1 (it) * 2010-05-18 2011-11-19 Btsr Int Spa Metodo e dispositivo perfezionato per alimentare un filo ad una macchina operatrice con tensione e velocita' costante
ITMI20111027A1 (it) * 2011-06-08 2012-12-09 Btsr Int Spa Metodo e dispositivo per alimentare a tensione e velocita' o quantita' costante un filo ad una macchina tessile
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

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CN106245212B (zh) 2021-02-12
CN106245212A (zh) 2016-12-21
EP3103749A1 (fr) 2016-12-14

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