EP1050610B1 - Procédé et dispositif pour contrôler les signaux de rotation du bras d'enroulement du fil de trame dans les fournisseurs de trame pour métiers à tisser - Google Patents

Procédé et dispositif pour contrôler les signaux de rotation du bras d'enroulement du fil de trame dans les fournisseurs de trame pour métiers à tisser Download PDF

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Publication number
EP1050610B1
EP1050610B1 EP00109087A EP00109087A EP1050610B1 EP 1050610 B1 EP1050610 B1 EP 1050610B1 EP 00109087 A EP00109087 A EP 00109087A EP 00109087 A EP00109087 A EP 00109087A EP 1050610 B1 EP1050610 B1 EP 1050610B1
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EP
European Patent Office
Prior art keywords
weft
signals
winding arm
sensor
feeder
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Expired - Lifetime
Application number
EP00109087A
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German (de)
English (en)
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EP1050610A3 (fr
EP1050610A2 (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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Publication date
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Publication of EP1050610A3 publication Critical patent/EP1050610A3/fr
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Publication of EP1050610B1 publication Critical patent/EP1050610B1/fr
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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 method and a device for controlling weft winding arm rotation signals in weft feeders for weaving looms, particularly feeders and pre-measurers for jet looms.
  • weft feeders are known and widely used which, in the case of jet looms, also act as weft pre-measurers.
  • these devices inserted between the spool and the loom, have the specific task of feeding a preset length of thread for each weft insertion, releasing it from a weft reserve accumulated on a drum of its own, in the form of turns wound onto said drum, and of also replenishing the released weft by winding back onto said drum a corresponding amount of thread so as to keep the weft reserve substantially invariant.
  • a system for feeding jet looms with pre-measurer of the thread fed at each weft insertion uses a weft pre-measurer and feeder 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 said fixed drum and is actuated electromagnetically in order to release the thread, allowing it to unwind from the drum, and in order 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 in order to replenish the weft reserve on the drum of the feeder/pre-measurer, and a supervisor microcontroller 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 for moving the windmilling arm that winds back the turns, replenish
  • said microcontroller 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 the rotation signals of the weft winding arm by detecting the passage of a moving magnet which rotates rigidly with said arm and generating a pulse at each turn of said arm which winds a corresponding turn onto the drum of the feeder/pre-measurer.
  • the microcontroller compares the number of pulses of the signals generated by said first and second sensors and accordingly activates the motor of the windmilling arm, making said number of pulses match so as to keep unchanged the weft reserve that is present on the drum of the feeder/pre-measurer (see e.g. US-A-471 541).
  • a typical condition in which the system loses control of weft reserve replenishment occurs very easily when said second magnetic sensor provides incorrect signals which do not correspond to a full rotation of the weft winding arm and to the corresponding winding of a turn onto the drum of the feeder/pre-measurer.
  • Said magnetic sensor typically a Hall sensor
  • Said magnetic sensor is in fact sensitive to the passage of the moving permanent magnet, which is usually supported by a flywheel which is arranged at the base of the drum of the feeder and rotates rigidly with the weft winding arm. Accordingly, in normal operating conditions, at each angular movement of the flywheel through 360°, the moving magnet passes in front of the sensor, which generates a corresponding pulsed signal corresponding to a full rotation of the weft winding arm around the drum of the feeder/pre-measurer on which said arm correspondingly winds a turn of thread.
  • the flywheel may oscillate and perform, with a reciprocating back-and-forth motion, a plurality of larger or smaller angular movements.
  • These abnormal operating conditions occur, for example, when the controlled weft insertion of the feeder is highly irregular, for example in the weaving of narrow bands of fabric.
  • the weft winding arm is subjected to rapid decelerations and accelerations which characterize the steps for braking and restarting, respectively, and said dynamic stresses cause said transient oscillation.
  • an overcount of the wound turns with respect to those actually present on the drum of the feeder can occur, when the feeder/pre-measurer is not moving, due to pulses generated by the magnetic sensor in relation to angular movements imparted manually and inadvertently to said flywheel by an operator, for example while performing adjustments on the feeder or on the entire weft thread feed system.
  • the aim of the present invention is substantially to eliminate the above-mentioned severe drawback, by providing a method and a device for controlling weft winding arm rotation signals which are adapted to select the signals produced by said magnetic rotation sensor, suppressing, as regards the correct counting of the turns wound onto the drum of the feeder/pre-measurer, the pulses of the signals not matched by an actual full rotation of the weft winding arm.
  • Another important object of the present invention is to provide a control method and device which are extremely simple, functional and reliable, and in particular, are such as to not require substantial modifications to the existing circuit means provided to control the feeder/pre-measurer associated with the system for feeding weft to the jet loom.
  • the invention is based on the concept of using, in order to detect the passage of at least one moving magnet associated with the flywheel which rotates jointly with the weft winding arm, a first magnetic sensor and a second magnetic sensor, which are mutually spaced by a preset distance and are adjacent to the circular path of said at least one magnet, and of sampling, with a frequency whose period is smaller than, or equal to, the minimum time between the fronts of two consecutive signal pulses, the signals of the first and second sensors in order to extract therefrom, as regards counting the number of turns wound on the drum of the feeder, transition criteria which indicate that a complete rotation of said arm has occurred and that said number of turns has consequently increased or decreased.
  • the reference sign SI generally designates a typical system for feeding the weft thread F to a jet loom TE with pre-measuring of the thread fed at each insertion and unwound from a spool RO.
  • the system SI uses, for this purpose, a weft feeder/pre-measurer, generally designated by P, which comprises a fixed drum TA on which a windmilling arm BR, associated with a flywheel VO and driven 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 in order to stop its unwinding when the pre-measured quantity or length is reached.
  • a microcontroller MC preset to supervise the entire system SI, generates an output CE for the actuation of the electromagnet of the weft retention finger DI and an additional set of three outputs a, b, c for actuating the motor MO by means of a power interface MPD (driver).
  • MPD power interface
  • a first sensor UWP of the optical type located at the output of the drum TA, is provided for counting the turns that unwind from the drum and sends to the microcontroller MC its pulsed signals UWSP, processed beforehand in an amplification and filtering circuit CAF.
  • Another sensor H of the magnetic type, is provided in order to supply the microcontroller MC with a pulse WSP at each turn of the windmilling arm BR that winds a corresponding turn onto the drum TA; said magnetic sensor being sensitive to the passage of a magnet M which is carried by the flywheel VO associated with the arm BR.
  • a weft release request signal TR generated by the loom TE, also reaches the microcontroller MC.
  • the microcontroller receives said request signal TR, it immediately energizes the actuator AE, which raises the weft retention finger DI, allowing the turns of the weft reserve RT to unwind.
  • the loom TE for example of the jet type, activates the blowers of the main nozzle and of the relay nozzles and inserts the weft in the shed.
  • the microcontroller by means of the signals UWSP, is kept updated on how many turns are unwound from the drum TA of the pre-measurer P and when the required number of turns is reached it activates, with reversed polarity, the actuator AE, causing the lowering of the weft retention finger DI and stopping the unwinding of the thread.
  • the microcontroller MC activates the motor MO in order to replace the turns of weft taken from the weft reserve RT and receives from the sensor H, at each rewound turn, a corresponding signal WSP.
  • the microcontroller compares the number of pulses of the signal UWSP with the number of pulses of the signal WSP, and makes the number of said pulses substantially coincide.
  • the microcontroller MC loses control of the replenishment of said reserve, which can accordingly become completely depleted, stopping the weaving process.
  • a control device as shown in Figure 2, which comprises a first magnetic sensor H1 and a second magnetic sensor H2, or Hall sensors, which are supported by the fixed frame of the feeder/pre-measurer P and are arranged, so as to be spaced by a distance D, one after the other adjacent to the circular path of the moving magnet M, from which they are spaced by a gap, or height, H.
  • the signals WSP1 and WSP2 respectively generated by said sensors H1-H2 assume over time, for a constant rotation rate of the flywheel VO, the pattern shown schematically in the chart of Figure 3.
  • Said chart shows that in every instant the reading or sampling of the pair of values that the signals WSP1-WSP2 assume allows to deduce univocally in which of the circular sectors SX-C-DX-OUT, shown in Figure 2, the moving magnet M is located; C being the central sector and SX and DX being the sectors to the left and to the right of the central sector relative to the clockwise direction of rotation of the magnet M, indicated by the arrow in Figure 2.
  • transition OUT ⁇ DX causes the increase of the numeric variable NS and the opposite transition DX ⁇ OUT causes its decrease.
  • the flywheel VO of the feeder P is provided with a permanent magnet Mo, preferably made of neodymium or samarium-cobalt, whose magnetic field has a polarity (N-S) which is orientated like the arrow F1 and therefore like the field to which the sensor H' is sensitive, and with a plurality of additional permanent magnets M1-M4 (for example four), all of which have a magnetic polarity which is opposite to the polarity of the magnet Mo and therefore matches the orientation of the arrow F2 of Figure 4 and the field to which the sensor H2 is sensitive; the magnets of the set M1-M4 being uniformly spaced by a constant angular pitch.
  • a permanent magnet Mo preferably made of neodymium or samarium-cobalt
  • the senor H' produces a signal pulse WSP1 only when the magnet Mo passes in its vicinity and likewise the sensor H2 produces a signal pulse WSP2 only when one of the magnets M1-M4 passes in its vicinity.
  • the time chart of the rotation signals generated by the sensors H'-H2 shows that between two consecutive pulses of the signal WSP1 there are always N pulses of the signal WSP2; the example shows four.
  • the microprocessor ⁇ P of the device is programmed so as to increase by one unit the numeric variable NS that represents the number of turns when it verifies the inequality A ⁇ N and so as to decrease by one unit said variable in the opposite case, when the inequality A ⁇ N occurs.
  • the flywheel VO in fact certainly has not made a full turn (in either direction) and therefore the winding of a turn is ruled out.
  • This embodiment of the control device does not allow to discriminate the direction of rotation of the arm BR and therefore is unable to detect the winding of an entire turn in the opposite direction with respect to the working rotation.

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

Claims (7)

  1. Procédé pour contrôler les signaux de rotation (WSP) du bras d'enroulement du fil de trame (BR) dans des fournisseurs de trame (P) pour des métiers à tisser (TE),
    caractérisé en ce qu'il consiste à utiliser, pour détecter le passage d'au moins une pièce magnétique mobile (M) associée avec le volant (VO) qui est en rotation conjointement avec le bras d'enroulement de fil de trame, un premier capteur magnétique et un second capteur magnétique (H1-H2) qui sont séparés mutuellement par une distance prédéterminée (D) et sont à proximité de la trajectoire circulaire de ladite au moins une pièce magnétique, et à échantillonner les signaux (WSP1-WSP2) des premier et second capteurs (H1-H2) pour extraire de ceux-ci, en vue de compter le nombre (NS) de spires enroulées sur le tambour (TA), des critères de transition (DX → OUT ; OUT → DX ; et, vice versa, A ≥ N) qui indiquent qu'une rotation complète dudit bras (BR) s'est produite et que ledit nombre (NS) de spires a augmenté ou diminué en conséquence.
  2. Procédé de contrôle selon la revendication 1,
    caractérisé en ce que la cadence d'échantillonnage desdits signaux (WSP1-WSP2) a une période qui est plus petite que, ou égale à, l'intervalle de temps minimum s'écoulant entre les fronts de deux impulsions consécutives de signal.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que les critères de transition (DX → OUT et vice versa) qui indiquent qu'une rotation complète du bras d'enroulement de fil de trame (BR) s'est produite dans une direction de rotation dans le sens des aiguilles d'une montre, et vice versa, sont vérifiées par les relations d'égalité C = OUT ; C1 = DX et vice versa ; dans lesquelles C est la valeur de la paire de signaux (WSP1-WSP2) à un instant d'échantillonnage générique (t) et C1 est la valeur de la même paire de signaux à l'instant d'échantillonnage précédent (t1).
  4. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que les premier et second capteurs (H'-H2) sont sensibles aux champs magnétiques ayant des polarités inverses et produits par une pièce magnétique (Mo) et, respectivement, par une pluralité de pièces magnétiques (M1-M2) portées par ledit volant (VO) et en ce que le critère qui indique qu'une rotation complète du bras d'enroulement de fil de trame s'est produite est représenté, pour une direction prédéterminée de rotation dudit bras (BR), par l'occurrence de la relation d'inégalité
       A ≥ N dans laquelle A est une variable numérique qui représente le nombre détecté d'impulsions intermédiaires du signal (WSP2) du second capteur (H2) se produisant entre deux impulsions consécutives du signal (WSP1) du premier capteur (H'), et N est le nombre prédéterminé desdites impulsions intermédiaires, qui correspond au nombre de ladite pluralité de pièces magnétiques (M1-M2).
  5. Dispositif pour mettre en oeuvre le procédé de contrôle selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce qu'il comprend deux capteurs magnétiques (H1-H2) qui sont associés au volant (VO) du bras d'enroulement de fil de trame (BR), sont disposés sur le tambour fixe du fournisseur (P), sont séparés mutuellement par une distance prédéterminée (D) et sont à proximité de la trajectoire d'une pièce magnétique mobile (M) qui est portée par ledit volant (VO) du bras d'enroulement de fil de trame, et un microcontrôleur (MC) qui est programmé de façon à échantillonner les signaux (WSP1-WSP2) produits par chacun des deux susdits capteurs magnétiques (H1-H2) lorsque ladite pièce magnétique (M) passe, vérifier lesdites transitions qui indiquent que le bras d'enroulement de fil de trame a réalisé un tour complet dans la direction de travail ou dans la direction opposée, et en conséquence augmenter ou diminuer le nombre (NS) de spires qui constituent la réserve de fil de trame (RT) enroulé sur le tambour (TA) dudit fournisseur et/ou pré-mesureur.
  6. Dispositif pour mettre en oeuvre le procédé de contrôle selon l'une quelconque des revendications 1, 2 et 4,
    caractérisé en ce qu'il comprend : des premier et second capteurs magnétiques (H'-H2), qui sont supportés, de façon à être séparés mutuellement par une distance (D), par le châssis fixe du fournisseur (P) et sont disposés de sorte que l'un est inversé par rapport à l'autre, de façon à être sensibles aux lignes de flux de champs magnétiques orientées de façon correspondante dans des directions opposées ; une première pièce magnétique mobile (Mo), qui a la même polarité que les lignes du champ auquel le premier capteur (H') est sensible, ledit premier capteur étant porté par le volant (VO) du bras d'enroulement de fil de trame (BR) dudit fournisseur et/ou pré-mesureur (P) ; une pluralité de pièces magnétiques mobiles additionnelles (M1-M4), qui sont également portées par ledit volant (VO) et ont la même polarité que les lignes du champ auquel le second capteur (H2) est sensible ; un microcontrôleur (MC), qui reçoit en entrée les signaux sélectifs (WSP1-WSP2) engendrés par les premier et second capteurs lorsque la première pièce magnétique mobile (Mo) et, respectivement, la pluralité de pièces magnétiques mobiles supplémentaires (M1-M4) passent ; ledit microcontrôleur étant programmé pour vérifier la relation d'inégalité (A < N) et pour augmenter ou diminuer la variable numérique (NS) qui représente le nombre de spires enroulées sur le tambour (TA) du fournisseur.
  7. Dispositif selon la revendication 5 ou 6,
    caractérisé en ce que lesdits premier et second capteurs magnétiques sont constitués par des capteurs à effet Hall.
EP00109087A 1999-05-07 2000-05-03 Procédé et dispositif pour contrôler les signaux de rotation du bras d'enroulement du fil de trame dans les fournisseurs de trame pour métiers à tisser Expired - Lifetime EP1050610B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999TO000369A IT1307713B1 (it) 1999-05-07 1999-05-07 Metodo e dispositivo di controllo dei segnali di rotazione del braccioavvolgitrama negli alimentatori di trama per telai di tessitura.
ITTO990369 1999-05-07

Publications (3)

Publication Number Publication Date
EP1050610A2 EP1050610A2 (fr) 2000-11-08
EP1050610A3 EP1050610A3 (fr) 2001-11-28
EP1050610B1 true EP1050610B1 (fr) 2004-09-15

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EP00109087A Expired - Lifetime EP1050610B1 (fr) 1999-05-07 2000-05-03 Procédé et dispositif pour contrôler les signaux de rotation du bras d'enroulement du fil de trame dans les fournisseurs de trame pour métiers à tisser

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EP (1) EP1050610B1 (fr)
DE (1) DE60013683T2 (fr)
IT (1) IT1307713B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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
EP1865596A1 (fr) * 2006-06-05 2007-12-12 L.G.L. Electronics S.p.A. Dispositif de livraison de fil entraîné par moteur à induction
TWI629231B (zh) * 2013-10-04 2018-07-11 醫電鼎眾股份有限公司 Cord reel with function of calculating cable length

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE900492A (nl) * 1984-09-04 1985-03-04 Picanol Nv Snelheidsregeling van inslagvoorafwikkelaar bij weefgetouwen.
DE19611998A1 (de) * 1996-03-26 1997-10-02 Iro Ab Hallsensor sowie Fadenliefergerät mit einem Hallsensor
DE19623101A1 (de) * 1996-06-10 1997-10-02 Bosch Gmbh Robert Vorrichtung zur Positionserkennung eines rotierenden Teils

Also Published As

Publication number Publication date
IT1307713B1 (it) 2001-11-14
EP1050610A3 (fr) 2001-11-28
ITTO990369A0 (it) 1999-05-07
DE60013683D1 (de) 2004-10-21
EP1050610A2 (fr) 2000-11-08
ITTO990369A1 (it) 2000-11-07
DE60013683T2 (de) 2005-02-10

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