EP1048768B1 - Procédé pour la surveillance de l'insertion de la trame dans les fournisseurs de métiers à tisser à jet avec unité de mesure de fil - Google Patents

Procédé pour la surveillance de l'insertion de la trame dans les fournisseurs de métiers à tisser à jet avec unité de mesure de fil Download PDF

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Publication number
EP1048768B1
EP1048768B1 EP00107986A EP00107986A EP1048768B1 EP 1048768 B1 EP1048768 B1 EP 1048768B1 EP 00107986 A EP00107986 A EP 00107986A EP 00107986 A EP00107986 A EP 00107986A EP 1048768 B1 EP1048768 B1 EP 1048768B1
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EP
European Patent Office
Prior art keywords
turns
weft
drum
nsp
microprocessor
Prior art date
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Expired - Lifetime
Application number
EP00107986A
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German (de)
English (en)
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EP1048768A3 (fr
EP1048768A2 (fr
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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    • 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
    • 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
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins

Definitions

  • the present invention relates to a method for monitoring weft insertion in feeders of jet looms with fed thread pre-measuring unit.
  • Weft pre-measuring units are known and widely used in the field of jet weaving (air- or water-jet looms) which, inserted between the spool and the loom, have the specific task of feeding a preset length of thread, for each weft insertion, by releasing it from a weft reserve accumulated on the drum of the unit in the form of turns wound onto the drum and to also replace the released weft by winding onto the drum a corresponding amount of thread, so as to keep the weft reserve substantially unchanged (see e.g. WO-A 87 04151).
  • a conventional system for feeding jet looms with a unit for pre-measuring the fed thread at each weft insertion uses a weft feeder and pre-measuring unit which comprises: a fixed drum, on which a windmilling arm winds the turns of thread that form the weft reserve; a weft retention finger for stopping the thread, which is associated with the fixed drum and is actuated electromagnetically in order to release the thread, allowing it to unwind from the drum, and to stop its unwinding when the pre-measured amount is reached; means for counting the turns of thread released at each weft insertion; means for counting the turns wound back onto the drum of the unit in order to restore the weft reserve; and a control microprocessor which receives a weft release signal from the loom and supervises the actuation of the weft retention finger, the counting of the unwound turns and the actuation of the motor that drives the windmilling arm that winds back the turns, restoring
  • the microprocessor processes the pulsed signals generated by a first optical sensor which detects the passage of the turns that unwind from the drum and, respectively, by a second magnetic sensor which provides one pulse at each turn of the windmilling arm that winds a corresponding turn onto the drum of the unit.
  • the microprocessor compares the number of pulses of the signals generated by the first and second sensors and actuates accordingly the motor of the windmilling arm, making the number of pulses match so as to keep unchanged the weft reserve that is present on the drum of the feeder and pre-measuring unit.
  • the circuit for detecting and amplifying the signal of the optical sensor designed to detect the turns that unwind from the drum can in fact eliminate the signal by interpreting it as noise and accordingly filtering it out by means of a high-pass filter.
  • the filter is provided in order to eliminate light variations that are much slower than those caused by the rapid passage of the thread and are noise-related, such as for example variations in external light, the passage of grains of dust, vibrations of light reflected on the sensor caused by the operation of the unit, and the like.
  • the weft can become entangled in the warp, or in the comb of the loom (if it is too dirty), and thus undergo sudden deceleration although the carrier fluid is fed at the maximum flow-rate.
  • the thread retained in the nozzle of the loom is propelled by a reduced flow, known as holding flow, at a pressure which is much lower than the normal weft release pressure: in this case also, the speed of the thread is reduced considerably.
  • the aim of the present invention is to eliminate this severe drawback.
  • an object of the present invention is to provide a method for monitoring weft insertion which is adapted to eliminate, or at least minimize, the possibility of depleting the weft reserve on the drum of the feeder and pre-measuring unit in any of the circumstances that can cause suppression of the signal of the sensor designed to detect the passage of the turns being unwound.
  • Another important object of the present invention is to provide a monitoring method which is highly reliable and in particular is independent of the variation of several parameters of the weaving process, such as in particular the nature and count of the weft thread, the structure and operating speed of the loom, and the length of the thread required for each weft insertion.
  • the method according to the invention is based on the statistical prediction that every insertion request that arrives at the control and supervisor microprocessor is usually performed correctly regardless of whether the unwinding turn detection sensor has seen and reported or not the passage of all the turns to be inserted. In this manner, if the passage of a turn is not detected after a preset interval of time since the last pulse generated by the passage of a turn, or since the last insertion request, this failed detection is taken to mean that the requested turns have been inserted.
  • the method according to the invention based on this prediction, consists in programming the microprocessor so that it generates, upon an external command, respective interrupts upon variation in the signals produced by the turn winding and unwinding sensors and upon variation in the weft request signal produced by the loom; in assigning the routines of the interrupts of the signals of said sensors the task of decreasing and, respectively, incrementing the counters of the number of turns wound onto, and respectively unwound from, the drum of the unit, and of setting a timer to a value which is equal to the maximum time that elapses between the passage of one turn and the next; and in giving the routine of the weft request signal the task of ascertaining that the number of turns inserted as a consequence of the directly preceding request exceeds a preset minimum threshold and the task of compensating for any missing turns by subtracting them from the turns that are present on the feeder drum; said microprocessor being also adapted to generate a periodic internal interrupt whose routine has the task of checking whether the setting of the timer has expired or
  • SI generally designates a conventional system for feeding a weft thread F to a jet loom TE with pre-measurement of the thread fed at each insertion and unwound from a spool RO.
  • the system SI uses, for this purpose, a weft feeder and pre-measuring unit, generally designated by the reference letter P, which comprises a fixed drum TA on which a windmilling arm BR, associated with a flywheel VO and actuated by a motor MO, winds a plurality of turns of thread which form a weft reserve RT.
  • a weft retention finger DI for stopping the thread F is associated with the drum TA of the feeder and is actuated by an electromagnetic actuator AE in order to release the thread, allowing it to unwind from the drum TA, and to stop its unwinding when the pre-measured amount or length is reached.
  • a microprocessor ⁇ P designed to supervise the entire system SI, generates an output CE for controlling the electromagnet of the weft retention finger DI and another set of three outputs a, b, c for controlling the motor MO by means of a power interface (driver) MPD.
  • a first optical sensor UWP located at the output of the drum TA, is provided in order to count the turns that unwind from the drum and sends to the microprocessor ⁇ P its pulsed signals UWSP, processed beforehand in an amplification and filtration circuit CAF.
  • a second magnetic sensor H provides the microprocessor ⁇ P with a pulse WSP at each rotation of the windmilling arm BR that winds a corresponding turn onto the drum TA, said magnetic sensor detecting the passage of a magnet M which is carried by the flywheel VO associated with the arm BR.
  • the circuit CAF for amplifying and filtering the signal produced by the optical sensor UWP is now described with reference to Figure 2.
  • Said sensor comprises an emitter diode LE and a receiver phototransistor FT, which produces, across its terminals, a weak current IR which is proportional to the amount of light received by reflection from a mirror, or the like, located on the drum TA of the unit P and which is struck by the light emitted by the diode LE.
  • the current fed to the emitter diode is adjusted by an appropriate control circuit CRC which is designed to keep the current substantially constant.
  • the weft thread F that unwinds from the drum intersects the beam of light that is incident on the mirror and reflected by it, causing an instantaneous decrease in the current IR emitted by the phototransistor.
  • the current signal IR is amplified in an amplifier A1 at the output of which there is a corresponding signal S2 which is amplified in terms of voltage.
  • the signal S2 is filtered in a high-pass filter A2 and the signal S3 that is present at the output of said filter is applied to a comparator A3, so that when signal S3 exceeds the reference threshold RF the positive pulse of the signal UWSP is produced. Otherwise, i.e., when S3 ⁇ RF, the pulse of the signal UWSP is suppressed.
  • the microprocessor ⁇ P also receives the weft release request signal TR generated by the loom TE.
  • the microprocessor receives the request signal TR, it immediately energizes the actuator AE, which lifts the weft retention finger DI, allowing the unwinding of the turns of the weft reserve RT.
  • the loom TE for example of the air-jet type, actuates the jets of the main nozzles and of the relay nozzles and inserts the weft in the shed.
  • the microprocessor by means of the signals UWSP, is kept informed on the number of turns unwound from the drum TA of the pre-measuring unit P and when the requested number of turns has been reached it actuates the actuator AE with reversed polarity, causing the lowering of the weft retention finger DI and stopping the unwinding of the thread.
  • the microprocessor ⁇ P actuates the motor MO in order to replenish the turns of thread taken from the weft reserve RT, and at each wound turn it receives from the sensor H a corresponding signal WSP.
  • the microprocessor compares the number of pulses of the signal UWSP with the number of pulses of the signal WSP and makes the number of the pulses substantially match. However, if one or more pulses of the signal UWSP are suppressed because S3 ⁇ RF due to one of the above noted reasons, the microprocessor loses control of reserve replenishment, and the reserve can become fully depleted, stopping the weaving process.
  • the present invention provides an insertion monitoring method which is independent of any checking of the match between the pulses of the signals WSP and UWSP and introduces the concept of the resetting, or lack thereof, of a counter within a preset time limit (timeout) elapsing from the passage of the last turn or from the actuation of the weft release request signal.
  • the microprocessor ⁇ P is programmed so as to generate ( Figures 4 and 5), upon a command which originates externally, respective interrupts upon a variation (a negative one in the example of Figures 4 and 5) of the signals UWSP and WSP produced by the turn unwinding and rewinding sensors and upon a variation (a positive one in the example) of the weft request signal TR generated by the loom TE, and so as to internally generate a periodic control interrupt.
  • the above described periodic interrupt is executed with a preset and constant frequency, for example equal to 1 ms.

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

Claims (8)

  1. Procédé de contrôle d'insertion de fil de trame dans des systèmes (SI) d'approvisionnement de métiers à tisser (TE) du type à injection avec une unité de prémesure (P) de fil qui comprend un tambour (TA) pour accueillir une réserve de fil de trame (RT), un doigt (DI) de retenue de fil de trame, un bras d'enroulement à moulinet (BR) pour enrouler des spires pour remplir la réserve de fil de trame, un premier capteur optique (UWP) pour détecter les spires de fil qui se déroulent à partir du tambour, un second capteur magnétique (H) pour détecter le nombre de tours du bras d'enroulement à moulinet et un microprocesseur superviseur (µP) qui commande le doigt de retenue du fil de trame (DI) et le moteur (MO) du bras d'enroulement à moulinet (BR) et reçoit en entrée un signal de requête de fil de trame (TR) engendré par le métier à tisser (TE) et des premier et second signaux d'impulsions (UWSP-WSP) engendrés par lesdits premier et second capteurs, qu'il compare, actionnant le bras d'enroulement à moulinet (BR) de façon à faire correspondre le nombre d'impulsions desdits premier et second signaux afin de maintenir la réserve de fil de trame (RT) sensiblement invariante,
    caractérisé en ce qu'il comprend les étapes consistant à déterminer, lorsque ledit premier signal (UWSP) présente un manque d'une ou de plusieurs impulsions par rapport au nombre de spires de la requête de fil de trame (TR), un intervalle de temps maximum (TMRO) après lequel le microprocesseur (µP), si aucune autres impulsions (UWSP) n'apparaissent en provenance dudit premier capteur optique (UWP), complète la libération des spires destinées à être insérées (NSI-NSP) et/ou la compensation des spires (NS) qui sont présentes sur ledit tambour (TA) du prémesureur (P).
  2. Procédé de contrôle selon la revendication 1,
    caractérisé en ce que ledit intervalle de temps maximum (TMRO) est mesuré en partant de la dernière impulsion du signal (UWSP) dudit second capteur optique (UWP) ou à partir du front d'activation du signal de requête de fil de trame (TR).
  3. Procédé de contrôle selon la revendication 1,
    caractérisé en ce que ledit intervalle de temps maximum (TMRO) est 2-3 fois supérieur au temps moyen de déroulement de spire.
  4. Procédé de contrôle selon la revendication 1,
    caractérisé en ce qu'il comprend les étapes consistant à :
    programmer ledit microprocesseur (µP) de façon à ce qu'il engendre, sous le contrôle externe des signaux (UWSP-WSP) desdits premier et second capteurs (UWP-H) et du signal de requête de fil de trame (TR) du métier à tisser (TE), des interruptions respectives qui se déclenchent d'après une variation prédéterminée desdits signaux, ledit microprocesseur étant aussi apte à engendrer, grâce à une commande interne, une interruption périodique additionnelle ;
    attribuer aux routines desdits signaux dudit premier capteur (UWP) la fonction de diminuer (NS-1) le compteur du nombre de spires (NS) enroulées sur le tambour du fournisseur (P) et respectivement d'incrémenter (NSP + 1) le compteur du nombre de spires (NSP) déroulées à partir dudit tambour, et de régler un temporisateur sur ledit intervalle de temps maximum (TMRO) qui est supposé s'écouler entre le passage d'une spire et le passage de la suivante ;
    attribuer aux routines d'interruption de requête de fil de trame (TR) la fonction de vérifier si le nombre de spires (NSP) insérées suite à la requête qui précède directement, excède ou non un seuil minimum prédéterminé (NSP ≥ NSI.FI) et la fonction de compenser toutes spires manquantes, les soustraire de celles présentes sur le tambour (NS - (NSI-NSP)), commencer l'insertion des spires (NSP = O), régler le temporisateur sur ledit intervalle de temps maximum (TMRO) ;
    attribuer la routine correspondant à ladite interruption périodique, la fonction de vérifier si le réglage (TMRO) du temporisateur s'est écoulé ou non pendant l'intervalle entre deux spires de façon à compenser lesdites spires et mettre le nombre des spires libérées égal au nombre de spires à libérer (NSP=NSI), de façon à indiquer la fin de l'insertion.
  5. Procédé de contrôle selon la revendication 4,
    caractérisé en ce que le coefficient (FI) qui détermine ledit seuil minimum prédéterminé (NSI.FI) est changé automatiquement par ie microprocesseur (µp) selon le type d'insertion requis.
  6. Procédé de contrôle selon la revendication 4, dans lequel les interruptions engendrées par lesdits premier et second signaux (UWSP-UWP) se produisent à la transition négative des impulsions desdits signaux.
  7. Procédé de contrôle selon les revendications précédentes, dans lequel ladite interruption interne est exécutée avec une fréquence parfaitement périodique.
  8. Procédé de contrôle selon la revendication 6,
    caractérisé en ce que ladite fréquence périodique est choisie égale à 1 ms.
EP00107986A 1999-04-27 2000-04-18 Procédé pour la surveillance de l'insertion de la trame dans les fournisseurs de métiers à tisser à jet avec unité de mesure de fil Expired - Lifetime EP1048768B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO990338 1999-04-27
IT1999TO000338A IT1307712B1 (it) 1999-04-27 1999-04-27 Metodo di sorveglianza dell'inserzione di trama nei sistemi dialimentazione di telai a getto di fluido con premisuratore del filato

Publications (3)

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EP1048768A2 EP1048768A2 (fr) 2000-11-02
EP1048768A3 EP1048768A3 (fr) 2001-11-28
EP1048768B1 true EP1048768B1 (fr) 2004-09-22

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EP00107986A Expired - Lifetime EP1048768B1 (fr) 1999-04-27 2000-04-18 Procédé pour la surveillance de l'insertion de la trame dans les fournisseurs de métiers à tisser à jet avec unité de mesure de fil

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EP (1) EP1048768B1 (fr)
DE (1) DE60013951T2 (fr)
IT (1) IT1307712B1 (fr)

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Publication number Priority date Publication date Assignee Title
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
ITTO20020735A1 (it) * 2002-08-21 2004-02-22 L G L Electronics Spa Metodo di rilevazione dello stallo del motore del
DE102004058406A1 (de) * 2004-12-03 2006-06-14 Iro Ab Verfahren zum Betreiben eines fadenverarbeitenden Systems

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JPH0733614B2 (ja) * 1985-04-05 1995-04-12 津田駒工業株式会社 よこ入れ制御方法およびその装置
DE3862670D1 (de) * 1987-04-08 1991-06-13 Sulzer Ag Verfahren fuer den betrieb eines schussfadenspeichers fuer eine webmaschine.
DE19526216A1 (de) * 1995-07-18 1997-01-23 Iro Ab Verfahren zum Abtasten eines Fadens und Fadenabzugssensor

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Publication number Publication date
DE60013951D1 (de) 2004-10-28
DE60013951T2 (de) 2005-10-06
EP1048768A3 (fr) 2001-11-28
ITTO990338A0 (it) 1999-04-27
ITTO990338A1 (it) 2000-10-27
IT1307712B1 (it) 2001-11-14
EP1048768A2 (fr) 2000-11-02

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