EP1059375B2 - Frein de fil pour fournisseur de trame avec des temps d'intervention réduits - Google Patents

Frein de fil pour fournisseur de trame avec des temps d'intervention réduits Download PDF

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Publication number
EP1059375B2
EP1059375B2 EP20000110983 EP00110983A EP1059375B2 EP 1059375 B2 EP1059375 B2 EP 1059375B2 EP 20000110983 EP20000110983 EP 20000110983 EP 00110983 A EP00110983 A EP 00110983A EP 1059375 B2 EP1059375 B2 EP 1059375B2
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EP
European Patent Office
Prior art keywords
braking
shaft
linear motor
braking means
thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20000110983
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German (de)
English (en)
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EP1059375B1 (fr
EP1059375A1 (fr
Inventor
Pietro Zenoni
Giovanni Pedrini
Rosario Castelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LGL Electronics SpA
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LGL Electronics SpA
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Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP1059375A1 publication Critical patent/EP1059375A1/fr
Publication of EP1059375B1 publication Critical patent/EP1059375B1/fr
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Publication of EP1059375B2 publication Critical patent/EP1059375B2/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
    • D03D47/364—Yarn braking means acting 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

Definitions

  • the present invention relates to a thread braking device for weft feeder, having reduced intervention times.
  • the invention relates to a thread braking device for a weft feeder in shuttle-less looms, particularly gripper looms, projectile looms and air-jet looms.
  • the invention relates to a thread braking device which comprises a braking means which has a continuous circular shape, typically a frustum-shaped body, which is supported frontally and coaxially to the drum of the weft feeder, in order to engage directly, or with interposed flexible elements, the thread that unwinds from the drum, and wherein the frustum-shaped braking body is subjected to the action of an electromechanical actuation means which is capable of varying the pressure with which the body is pressed against the drum of the feeder; the actuation means is supplied with a modulated excitation current.
  • a braking means which has a continuous circular shape, typically a frustum-shaped body, which is supported frontally and coaxially to the drum of the weft feeder, in order to engage directly, or with interposed flexible elements, the thread that unwinds from the drum, and wherein the frustum-shaped braking body is subjected to the action of an electromechanical actuation means which is capable of varying the pressure with which the body is
  • Devices for positive modulated braking of the specified type are known in which the braking body is subjected to the electrodynamic action produced by the interaction of the excitation current that circulates in a coil associated with the braking body and of the magnetic field of a permanent magnet which is fixed with respect to the braking body.
  • the conductor of the moving coils must necessarily be small, and the coils must be formed by a minimal number of turns in order to avoid increasing excessively the mass, and therefore the inertia, of the frustum-shaped body that supports said coil.
  • a motor of the reversible type preferably of the step type, which is suitable to act on the movable support in order to modulate, proportionally to the variation of the mechanical tension of the thread during the beat of the loom, so as to vary the pressure applied by the body to the drum of the braking device, does not allow to provide immediate intervention, as required by modern looms, which have a high average speed of the weft thread.
  • the electrodynamic yield of the step motor used to drive the braking device is not satisfactory, since it is necessary to use a high driving current in order to have an adequate movement of the motor shaft.
  • the aim of the present invention is to provide a thread braking device for weft feeder which allows to have extremely short intervention times of the braking device with respect to conventional devices.
  • an object of the present invention is to provide a thread braking device for weft feeder in which the reduced intervention times are associated with a low driving current for actuating the motor shaft of the braking device.
  • Another object of the present invention is to provide a thread braking device for weft feeder in which the electrodynamic yield of the device is higher than in known devices for an equal driving current.
  • Another object of the present invention is to provide a thread braking device for weft feeder which allows to transmit to the braking cone of the braking device a movement which is very precise in relation to the very low thickness that the thread can have.
  • Another object of the present invention is to provide a thread braking device for weft feeder which is highly reliable, relatively easy to manufacture and at competitive costs.
  • 1 designates a conventional weft feeder which comprises a fixed drum on which a hollow rotating arm, or windmilling arm, winds a plurality of turns which constitute the weft reserve.
  • the hollow arm is rigidly coupled to a motor shaft which is likewise hollow, and the thread that arrives from a spool (not shown) runs in the cavity of the shaft of the arm.
  • the loom draws a certain number of turns from the reserve, and the thread that unwinds from the drum of the weft feeder 1 is subjected to a modulated braking means which allows to control the mechanical tension of the thread, keeping it substantially constant as the travel acceleration that the loom applies to said thread in performing each individual beat varies.
  • the braking means is composed of a braking body 2, typically a frustum-shaped body which has a continuous circular shape (in a first embodiment of the invention), is made of high-strength synthetic material, and is supported by a movable support 3, which is arranged in front of the drum of the feeder 1 and coaxially thereto and with which the body 2 is pushed into contact in order to engage the thread that unwinds from the feeder 1.
  • a braking body 2 typically a frustum-shaped body which has a continuous circular shape (in a first embodiment of the invention)
  • a movable support 3 which is arranged in front of the drum of the feeder 1 and coaxially thereto and with which the body 2 is pushed into contact in order to engage the thread that unwinds from the feeder 1.
  • the frustum-shaped body 2 is rigidly coupled to the movable support 3 by interposing springs 4 which provide an elastic suspension which is capable of damping the braking action but most of all of ensuring the perfect centering of the frustum-shaped body 2 with the drum of the weft feeder 1.
  • weft thread is designated by the reference letter T.
  • the movable support 3 is connected to a support 5 which is directly connected to the shaft 6 of a motor.
  • the motor is a linear motor M, whose shaft 6 is made of nonmagnetic material and constitutes the rotor of the linear motor.
  • the shaft 6 is coupled to a supporting element 7 on which two magnetic rings (for example made of neodymium) are fitted; such rings are magnetized radially and in opposite directions.
  • the two magnetic rings are designated by the reference numerals 10 and 11 and are fitted on a ring 9 of magnetic material (for example iron), which is in turn fitted on a spool 8 (made of plastics) rigidly coupled to the shaft 6.
  • a ring 9 of magnetic material for example iron
  • the stator of the linear motor is constituted by an outer enclosure 20, through which the shaft 6 passes coaxially, and by at least two pole shoes 12 and 13 which wrap around two coils 14 and 15.
  • the linear motor has an additional pole shoe (third pole 16) which greatly improves the efficiency of the motor.
  • the modulation of the braking action of the braking device according to the invention is performed by acting on a movement of the braking device, i.e., of the shaft 6 and therefore of the braking body 2.
  • the flux generated by the magnets 10 and 11 concatenates with the coils 14 and 15, and by making currents flow through said coils one obtains a movement of the shaft 6 in one direction or the other according to the direction of the current.
  • the braking device according to the invention can further be provided with means for measuring the movement of the motor, i.e., the movement of the shaft 6 that directly actuates the braking device.
  • the means for sensing the movement of the motor are conveniently constituted by a sensor device 24 which faces a magnet 25 which is rigidly coupled to the end of the shaft 6 of the motor that lies opposite the end that is connected to the braking body 2.
  • the sensor device 24 is sensitive to the magnetic field and measures the distance between it and the magnet 25.
  • Such distance is directly proportional to the movement that the shaft 6 of the motor performs in order to move the braking body 2 into contact with the drum of the weft feeder 1.
  • the actuation of the linear motor can be controlled by a signal which arrives from the loom, or more specifically from a sensor, which directly measures the actual tension of the weft thread T, and by means of a microprocessor regulates the braking action of the braking device according to the parameters outside the loom or according to the tension of the weft thread T.
  • the command issued by the microprocessor consists of a current signal which excites the coils 14 and 15.
  • the use of a linear motor allows to have high transmission efficiency for the motion applied by the shaft 6 to the braking body 2, since the connection between the two elements is substantially direct.
  • the electrodynamic yield i.e., the force that can be generated by the motor
  • the ratio of dissipated power to performance is highly in favor of the linear motor.
  • FIG 2 is a view of a second embodiment of the braking device according to the invention, in which the linear motor is used as shown in Figure 1 , with the variation that the braking body, designated by the reference numeral 32 in this case, is formed by a ring which has, on its internal circumference, a ring of bristles 33 which are meant to apply pressure, pushing the weft thread T against the drum of the weft feeder 1.
  • Figure 3 illustrates a third embodiment of the braking device according to the invention, in which the linear motor, designated by the reference letter M in this figure and in the preceding figures for the sake of simplicity, is applied in order to actuate a braking body 42 which is constituted by a multiple-lamina brake.
  • Figure 4 is instead a general view of the weft feeder with which the linear motor is associated in order to provide a braking device according to the present invention.
  • Figure 5 is a view of another embodiment of the braking device according to the invention, in which a plurality of linear motors, particularly three linear motors, are used as shown in detail in Figure 6 .
  • the three linear motors, each designated by the reference letter M, are arranged so that the braking cone is perfectly centered on the drum of the weft feeder 1 in order to achieve constant braking of the weft thread T once a certain braking force has been preset.
  • the microprocessor (not shown) reads on the feedback sensor the resulting movement and sets the zero point of each motor M, determining for the three points the zero plane for which the braking cone is centered exactly on the rounded end portion of the weft feeder 1.
  • the linear motors M are then actuated by a signal which originates from the weaving loom or from a tension meter arranged on said weft T, in order to maintain the programmed tension value.
  • the movable braking part must be very light.
  • Figure 5 illustrates the connection between the linear motor M and the movable support 3 which is connected to the braking body 2.
  • This connection is provided by means of a ball joint 40.
  • the three linear motors M are all engaged in the same ball joint 40 and allow to form a plane on which the base of the braking cone (braking body 2) is arranged, so as to achieve exact self-centering of the braking cone 2 with respect to the drum of the weft feeder 1.
  • Average weft speeds of up to 1800 m/min are in fact reached in modern shuttle-less looms. With a reserve drum having a diameter of 140 mm, for example, one obtains approximately 4000 rpm. Since the instantaneous speed can be as much as 50% higher than the average speed, main motor speeds of 6000 rpm may also occur. This means that the weft thread T travels along one turn in approximately 10 msec, and since a loom with a height of 1800 mm requires at least 4 turns of thread to form a beat, the brake must modulate the braking action at least twice per beat and therefore intervene in a few milliseconds if one wishes it to intervene in real time. It is thus evident that intervention speed is an essential fact.
  • weft thread braking device In practice it has been observed that the weft thread braking device fully achieves the intended aim and objects, since it allows to intervene with extremely short times on the braking of the weft thread, thus meeting the requirements of extremely fast intervention of modern looms.
  • the shaft 6 of the motor M can be moved to the end of its stroke so as to allow the brake to open completely if it is necessary to replace it or if it is necessary to insert the thread through said braking means.
  • the materials used may be any according to requirements and to the state of the art.

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

Claims (11)

  1. Un dispositif de freinage de fil pour un dispositif d'amenée de fil de trame, comprenant des moyens de freinage (2, 3) qui sont supportés de façon frontale et coaxiale par rapport à un tambour d'un dispositif d'amenée de fil de trame (1) de façon à engager directement ou indirectement le fil (T) qui se déroule dudit tambour, caractérisé en ce que
    lesdits moyens de freinage sont actionnés par au moins un moteur linéaire (M) qui permet l'approche ou l'espacement mutuel desdits moyens de freinage (2, 3) par rapport audit tambour de façon à moduler le freinage dudit fil de trame (T), en ce que
    le rotor dudit moteur linéaire (M) est constitué par un arbre (6) qui est relié auxdits moyens de freinage (2, 3), le mouvement dudit arbre permettant de moduler l'action de freinage desdits moyens de freinage (2, 3) sur le fil de trame (T), et en ce que
    ledit moteur linéaire (M) comprend une enceinte externe (20) appropriée pour recevoir ledit arbre (6) qui est supporté par un élément de support (7) agencé coaxialement audit arbre, une bague (9) constituée d'un matériau magnétique étant adaptée sur ledit élément de support(7), deux bagues magnétiques (10, 11) étant adaptées sur ladite bague (9) constitués d'un matériau magnétique, lesdites bagues magnétiques (10, 11) étant magnétisées radialement et dans
  2. Le dispositif selon la revendication 1, caractérisé en ce que ledit moteur linéaire (M) comprend au moins deux pôles (12, 13).
  3. Le dispositif selon la revendication 1, caractérisé en ce que ledit moteur linéaire (M) comprend trois pôles (12, 13, 16).
  4. Le dispositif selon la revendication 2 ou la revendication 3, caractérisé en ce que l'enceinte externe (20) dudit moteur (M) constitue le stator du moteur, deux bobines (14, 15) étant reçues entre ladite enceinte externe (20) et lesdits pôles (12, 13, 16) du moteur linéaire (M).
  5. Le dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit arbre (6) présente, à l'extrémité opposée à l'extrémité destinée à la liaison auxdits moyens de freinage (2, 3), un aimant (25) qui fait face à au moins un capteur (24) destiné à détecter le mouvement dudit arbre (6) du moteur linéaire (M).
  6. Le dispositif d'actionnement selon la revendication 4 ou la revendication 5, caractérisé en ce que lesdites bobines (14, 15) sont entrainées par un courant, en fonction de la force de freinage devant être obtenue sur ledit fil de trame (T).
  7. Le dispositif d'actionnement selon la revendication 5, caractérisé en ce que le courant destiné à entrainer lesdites bobines (14, 15) est fourni par un microprocesseur relié à un capteur destiné à détecter la tension du fil de trame (T), ledit microprocesseur étant en outre relié audit capteur (24) destiné à détecter le mouvement dudit arbre (6) du moteur linéaire (M) afin de produire le mouvement souhaité dudit arbre (6) en fonction de la force de freinage souhaitée, qui est déterminée en comparent la force de freinage appliquée par ledit arbre (6) avec la tension dudit fil de trame.
  8. Le dispositif selon la revendication 1, caractérisé en ce que lesdits moyens de freinage (2, 3) constituent un corps tronconique qui est relié, grâce à des moyens souples, à un support mobile (5) qui, à son tour, est claveté sur ledit arbre (6) dudit au moins un moteur linéaire (M).
  9. Le dispositif selon la revendication 1, caractérisé en ce que lesdits moyens de freinage (2, 3) comprennent un frein à balai qui est relié audit arbre (6) dudit au moins un moteur linéaire (M).
  10. Le dispositif selon la revendication 1, caractérisé en ce que lesdits moyens de freinage (2, 3) comprennent un frein à lamelles multiples relié à l'arbre (6) dudit au moins un moteur linéaire (M).
  11. Le dispositif selon la revendication 1, caractérisé en ce qu'il comprend trois moteurs linéaires (M) qui sont reliés auxdits moyens de freinage (2, 3) par un élément de support, lesdits trois moteurs linéaires étant prévus pour permettre le centrage desdits moyens de freinage (2, 3) par rapport au tambour dudit dispositif d'amenée de fil de trame (1).
EP20000110983 1999-06-01 2000-05-29 Frein de fil pour fournisseur de trame avec des temps d'intervention réduits Expired - Lifetime EP1059375B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO990459 IT1308067B1 (it) 1999-06-01 1999-06-01 Dispositivo di frenatura del filato, per alimentatore di trama,avente tempi di intervento ridotti
ITTO990459 1999-06-01

Publications (3)

Publication Number Publication Date
EP1059375A1 EP1059375A1 (fr) 2000-12-13
EP1059375B1 EP1059375B1 (fr) 2003-09-17
EP1059375B2 true EP1059375B2 (fr) 2009-04-29

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ID=11417855

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Application Number Title Priority Date Filing Date
EP20000110983 Expired - Lifetime EP1059375B2 (fr) 1999-06-01 2000-05-29 Frein de fil pour fournisseur de trame avec des temps d'intervention réduits

Country Status (3)

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EP (1) EP1059375B2 (fr)
DE (1) DE60005244T3 (fr)
IT (1) IT1308067B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3665319B1 (fr) * 2017-08-08 2023-03-22 Vandewiele Sweden AB Frein de fil réglable

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20020029U1 (it) * 2002-02-08 2003-08-08 L G L Electronics Spa ,,dispositivo alimentatore di trama per macchine tessili con sistema di fissaggio del tamburo fisso al corpo motore perfezionato,,
ITTO20040105U1 (it) * 2004-08-05 2004-11-05 Lgl Electronics Spa Alimentatore di trama per telai di tessitura provvisto di dispositivo di frenatura auto-regolante
ITTO20050279A1 (it) 2005-04-27 2006-10-28 Lgl Electronics Spa Dispositivo di frenatura del filato in alimentatori di trama per macchine tessili
ITTO20050484A1 (it) * 2005-07-14 2007-01-15 L G L Electronics Spa Unita' di controllo per dispositivi di frenatura del filato in alimentatori di trama per telai di tessitura, e procedura di sintonizzazione della stessa
DE602007004475D1 (de) * 2007-07-13 2010-03-11 Lgl Electronics Spa Schussfadenliefervorrichtung für Textilmaschinen mit einer Fadenbremsvorrichtung
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
CN102505288B (zh) * 2011-10-19 2013-09-25 宁波宏大纺织仪器有限公司 一种止纱销控制方法及利用该方法的装置
EP2623650B1 (fr) * 2012-02-02 2015-03-11 Iro Ab Frein de fil pour dispositif d'alimentation de fil
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.
ITTO20120487A1 (it) 2012-06-04 2013-12-05 Lgl Electronics Spa Metodo di controllo della tensione del filato in svolgimento da un alimentatore di trama ad accumulo per macchine tessili.
ITTO20120875A1 (it) * 2012-10-09 2014-04-10 Lgl Electronics Spa Dispositivo frena-trama per alimentatori di filato a tamburo fisso.
DE102014118743B4 (de) 2014-12-16 2023-12-21 Memminger-Iro Gmbh Verfahren zur Steuerung der Fadenlieferung eines Fadenliefergerät und Fadenliefergerät
CN108884610B (zh) * 2015-12-16 2020-10-13 范德威尔（中国）纺织机械有限公司 具有用于纱线张力调节的电动机组件的喂纱器
WO2017138857A1 (fr) * 2016-02-09 2017-08-17 Iro Aktiebolag Prédélivreur avec frein de fil réglable électriquement
IT201700051526A1 (it) * 2017-05-12 2018-11-12 Roj S R L Dispositivo elettromagnetico di arresto del filo di trama in porgitrama per macchine tessili e cursore per tale dispositivo

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Publication number Priority date Publication date Assignee Title
DE534263T1 (de) * 1991-09-20 1993-09-02 L.G.L. Electronics S.P.A., Bergamo, It Selbstregulierende fadenbremse fuer eine schussfadenliefervorrichtung.
IT1261331B (it) * 1993-11-05 1996-05-14 Lgl Electronics Spa Perfezionamento ai dispositivi di frenatura modulata positiva del filato per apparecchi alimentatori di trama.
IT1268111B1 (it) * 1994-10-10 1997-02-20 Lgl Electronics Spa Dispositivo di frenatura modulata positiva del filato, per apparecchi alimentatori di trama
DE19625760A1 (de) * 1996-06-27 1998-01-02 Sobrevin Fadenbremse
IT1303154B1 (it) * 1998-07-17 2000-10-30 Lgl Electronics Spa Dispositivo perfezionato di frenatura modulata del filato di trama permacchine tessili.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3665319B1 (fr) * 2017-08-08 2023-03-22 Vandewiele Sweden AB Frein de fil réglable

Also Published As

Publication number Publication date
ITTO990459A1 (it) 2000-12-01
DE60005244D1 (de) 2003-10-23
DE60005244T3 (de) 2009-10-29
IT1308067B1 (it) 2001-11-29
DE60005244T2 (de) 2004-07-01
EP1059375B1 (fr) 2003-09-17
EP1059375A1 (fr) 2000-12-13

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