EP1577246B1 - Fournisseur de trame pour les métiers à tisser avec un dispositif pour mésurer des fils de réserve - Google Patents

Fournisseur de trame pour les métiers à tisser avec un dispositif pour mésurer des fils de réserve Download PDF

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Publication number
EP1577246B1
EP1577246B1 EP20050002742 EP05002742A EP1577246B1 EP 1577246 B1 EP1577246 B1 EP 1577246B1 EP 20050002742 EP20050002742 EP 20050002742 EP 05002742 A EP05002742 A EP 05002742A EP 1577246 B1 EP1577246 B1 EP 1577246B1
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EP
European Patent Office
Prior art keywords
cylinder
finger
feeder
weft
loops
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.)
Not-in-force
Application number
EP20050002742
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German (de)
English (en)
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EP1577246A1 (fr
Inventor
Pietro Zenoni
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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Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP1577246A1 publication Critical patent/EP1577246A1/fr
Application granted granted Critical
Publication of EP1577246B1 publication Critical patent/EP1577246B1/fr
Not-in-force legal-status Critical Current
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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 weft feeder for weaving looms, particularly fluid-jet looms, with a device for measuring the weft reserve on the loom.
  • a general weft feeder for weaving looms comprises a stationary cylinder on which a motorized swivel arm winds a plurality of yarn loops forming a weft reserve. Upon request from the loom, the yarn is unwound from the cylinder and is fed to the loom.
  • the above feeders are generally provided with a weft-premeasuring device, which has the duty of stopping the unwinding yarn at each insertion when a desired number of loops has been inserted.
  • a weft-premeasuring device typically comprises an electrically operated pin which is operated to lock/unlock the unwinding loops on the basis of a signal generated by a loop-counting sensor for the unwinding loops.
  • a second sensor is provided for counting the loops wound on the cylinder, so that the reserve of loops on the cylinder can be indirectly determined, in order to maintain it constant, by comparing the signals generated by said sensors.
  • the loop-counting sensor may fail to detect a few unwinding loops, thereby deceiving the reserve-measuring system and causing a corresponding, uncontrolled reduction of the weft reserve.
  • a weft feeder is provided with a device for monitoring the weft reserve.
  • the device comprises three sensor elements mounted on the cylinder, which cooperate with respective detectors located outside the cylinder.
  • the sensor elements each consist of a magnetic plate that is oscillably mounted in the cylinder, in contrast with elastic means, from a first position protruding beyond the surface of the cylinder to a second position arranged at the same level of the surface, in relation to the presence/absence of yarn loops.
  • the detectors react with a signal when the position of the sensor element changes.
  • US 5,211,347 discloses a thread feed device having a storage body on which thread turns are wound.
  • the thread feed device is provided with scanning device for controlling the thread winding speed.
  • the scanning device comprises a sensor element consisting of a swing arm which, at rest, protrudes outwards from the outer surface of the storage body.
  • the swing arm bears a magnet which cooperates with a detecting element such as a Hall sensor that generates an output signal depending on the distance between the magnet and the sensor, which distance depends on the position of the swing arm that can be deflected to a greater or lesser extent upon the feeding or removal of the thread supply.
  • a main object of the present invention is to overcome the above drawbacks and limits of the known systems for measuring the weft reserve by providing a weft feeder particularly for Fluid-jet looms, which is provided with a device which is capable of directly measuring the reserve on the cylinder, which is not influenced by any miscounts of the number of loops which are wound/unwound upon/from the cylinder, and which is adjustable in relation to changes of diameter of the cylinder.
  • a weft feeder 10 comprises a stationary cylinder 12 on which a swivel arm 14 driven by a motor 16 winds a plurality of yarn loops forming a weft reserve RT. Upon request from the loom (not shown), yarn F is unwound from the cylinder to feed the loom.
  • cylinder 12 consists of four cylinder parts such as 12s supported in such a way that their radial position can be changed. This allows the diameter of the cylinder, and therefore of the loops, to be adjusted in order to make the weft length, so called "loom height", correspond to an exact integral multiple of the length of the loop.
  • Feeder 10 is provided with a weft-premeasuring device 18 supported on the free end of a stationary arm 20 projecting longitudinally from the motor housing.
  • Weft-premeasuring device 18 comprises a pin 22 that is axially operated by a solenoid valve (not shown) to stop yarn F unwinding from the delivery end of the cylinder when a desired number of loops has been unwound. Such number is measured in a know way by a loop-counting sensor for the unwinding loops 24 (Fig. 1).
  • the position of weft-premeasuring device 18 relative to stationary arm 20 is adjustable in order to maintain constant the distance of the device from cylinder 12 when the diameter of the cylinder is changed.
  • feeder 10 is provided with a device for measuring the weft reserve 26 according to this invention.
  • the device comprises a rigid finger 28 arranged in a longitudinal groove 30 made in a middle section of cylinder part 12s in front of the weft-premeasuring device.
  • the finger is elastically connected with one of its ends to the cylinder for swinging under the pressure of the yarn wound on the cylinder, from a first position projecting outside the skirt of the cylinder (Fig. 2), to a second, inner position (Fig. 3), and vice versa.
  • the outer surface of finger 28 is suitably profiled so that the slope of the finger will change in proportion to the number of loops engaging the finger. To this purpose, said outer surface has a proximal sloping section 28a extending from the connection end of the finger.
  • finger 28 consists of a rigid, elongated member 32 of a non-magnetic metal material, which is supported on an elongated, elastic blade 34 having one end screwed to cylinder part 12s.
  • a permanent magnet 38 is incorporated within member 32 near the distal end of finger 28, and a Hall sensor 40 of a conventional kind is mounted on weft-premeasuring device 18 in front of the magnet.
  • sensors are provided with an analog voltage output whose amplitude is proportional to the normal component of the intensity of the magnetic field generated by the magnet, which component is itself inversely proportional to the distance between the magnet and the sensor.
  • Fig. 4 shows the relation between the output voltage U of sensor 40 and the distance D between the magnet and the sensor.
  • the voltage U is variable from a maximum value Umax, corresponding to the nearest position Dmin of the magnet, i.e., with raised finger 28, to a minimum value Umin corresponding to the farthest position Dmin of the magnet, i.e., when finger 28 is lowered.
  • Hall sensor 40 is connected to convey the voltage signal U to a control unit consisting of a micro-controller M via an Analog to Digital converter A/D.
  • Micro-controller M is programmed to compare the voltage value U with a threshold value Us stored in a permanent memory MEM such as, e.g., a Eeprom.
  • the threshold value Us is conventionally chosen in the range Umax to Umin, and corresponds to an intermediate position of finger 28 regarded as a threshold in relation to the absence/presence of the reserve.
  • Micro-controller M is connected to the motor to restore the reserve on the basis of the above comparison.
  • the operation of the present device prevents emptying/overstoring of the weft reserve on the cylinder as described below.
  • feeder 10 feeds groups of yarn loops partitioned in a known way by the weft-premeasuring device, which has the duty of stopping the unwinding yarn at each weft insertion when a desired number of loops has been inserted.
  • Finger 28 swings in relation to the number of loops wound upon the corresponding axial portion of the cylinder.
  • Hall sensor 40 generates a voltage signal U that is inversely proportional to the distance of the magnet incorporated in finger 28, and sends such signal to the micro-controller. In case of over-emptying of the cylinder, the generated voltage value exceeds the threshold value Us and micro-controller M controls the motor in order to wind new loops on the cylinder.
  • the position of premeasurer 18 is adjusted as usual in order to maintain constant the distance of the premeasurer from the skirt of the cylinder. Automatically, since the Hall sensor is incorporated within device 18, the nominal value of the distance of sensor 40 from finger 28 is also restored.
  • the threshold value Us may be set in a factory setting step or may be automatically acquired, e.g., during the procedure of restoring the reserve. Such procedure is usual in this field and consists of completely unwinding the reserve from the cylinder, and then rewinding it.
  • the micro-controller is programmable to acquire the maximum value Umax after unwinding the reserve, when the finger is free to return to its horizontal, resting position, as well as the minimum value Umin during rewinding the reserve, when the finger is covered as shown in Fig. 3.
  • the micro-controller is automatically capable of recognizing the latter condition in that the signal generated by the sensor, once reached this position, becomes constant.
  • the threshold value Us is determined on the basis of a desired algorithm whose variables are said values Umax and Umin, e.g., the arithmetical mean thereof. Programming the micro-controller is usual for the person skilled in the art and therefore will be not further disclosed.
  • finger 28 may consist of a shaped, monolithic member of a non-magnetic, elastic material. Also, the fact that the voltage value generated when the finger is raised is higher than the voltage value generated when the finger is lowered is a mere project option, since the relation between the output voltage of the sensor and the intensity of the magnetic field will depend on the kind of sensor used.

Landscapes

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

Claims (9)

  1. . Dévideur de fil de trame pour des métiers à tisser, qui comprend :
    - un cylindre stationnaire (12) de diamètre ajustable et adapté pour soutenir plusieurs boucles de fil (RT) enroulées en hélice sur sa jupe extérieure,
    - un doigt (28) qui incorpore un aimant (38) et monté à coulissement élastique le long de la jupe du cylindre sous la poussée du fil enroulé sur le cylindre, de manière à être sollicité depuis une première position en saillie à l'extérieur de la jupe jusqu'à une deuxième position intérieure et inversement,
    - dispositif de prémesure de fil de trame (18) supporté à une distance ajustable par rapport à l'axe du cylindre, au moyen duquel la distance entre le dispositif de prémesure de fil de trame (18) et la collerette du cylindre (12) peut être maintenue constante lorsque le diamètre du cylindre change,
    caractérisé en ce que ledit dispositif de prémesure de fil de trame (18) comprend un détecteur (40) disposé en position stationnaire par rapport au cylindre (12), situé en face de l'aimant (38) et qui délivre un signal de sortie (U) proportionnel à la distance entre l'aimant et le détecteur.
  2. . Dévideur selon la revendication 1, caractérisé en ce qu'une des extrémités du doigt (28) est reliée élastiquement à la jupe du cylindre de manière à pouvoir pivoter depuis ladite première position jusqu'à ladite deuxième position et inversement.
  3. . Dévideur selon la revendication 2, caractérisé en ce que ledit doigt (28) présente une surface extérieure active où le fil peut s'engager et qui est profilée de manière à ce que l'inclinaison du doigt soit proportionnelle au nombre de tours engagés autour de ladite surface active.
  4. . Dévideur selon la revendication 3, caractérisé en ce que la surface active présente une partie proximale (28a) en pente adjacente à l'extrémité de liaison du doigt.
  5. . Dévideur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ledit doigt (28) est constitué d'un élément rigide allongé (32) fabriqué en un matériau non magnétique et fixé sur une lame élastique (34) vissée sur le cylindre (12).
  6. . Dévideur selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comprend une unité de contrôle (M) raccordée de manière à recevoir ledit signal de sortie (U) et à le comparer à une valeur de seuil (Us) qui correspond à une position intermédiaire du doigt (28), laquelle position intermédiaire est située entre ladite première et ladite deuxième position et est considérée comme un seuil pour l'absence ou la présence de réserve.
  7. . Dévideur selon la revendication 6, caractérisé en ce que ladite unité de contrôle (M) est raccordée pour amener les boucles à s'enrouler sur le cylindre (14) lorsque ledit signal de sortie (U) dépasse ladite valeur de seuil (Us), de manière à donner des informations sur la diminution du nombre de boucles enroulées sur le cylindre.
  8. . Dévideur selon la revendication 7, caractérisé en ce que ladite unité de contrôle est programmée pour acquérir automatiquement une valeur de tension électrique en l'absence de charge (Umax) lorsque le doigt est dans ladite première position et une valeur de tension électrique à pleine charge (Umin) lorsque le doigt est dans ladite deuxième position et pour déterminer ladite valeur de seuil (Us) à partir d'un algorithme qui utilise comme variables lesdites valeurs de tension électrique en l'absence de charge et de tension électrique à pleine charge.
  9. . Dévideur selon la revendication 8, caractérisé en ce que ledit algorithme consiste en la moyenne arithmétique desdites valeurs de tension électrique en l'absence de charge (Umax) et des valeurs de tension électrique à pleine charge (Umin).
EP20050002742 2004-03-17 2005-02-10 Fournisseur de trame pour les métiers à tisser avec un dispositif pour mésurer des fils de réserve Not-in-force EP1577246B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20040176 ITTO20040176A1 (it) 2004-03-17 2004-03-17 Alimentatore di trama per telai di tessitura con dispositivo di rilevamento della scorta
ITTO20040176 2004-03-17

Publications (2)

Publication Number Publication Date
EP1577246A1 EP1577246A1 (fr) 2005-09-21
EP1577246B1 true EP1577246B1 (fr) 2007-06-27

Family

ID=34835621

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Application Number Title Priority Date Filing Date
EP20050002742 Not-in-force EP1577246B1 (fr) 2004-03-17 2005-02-10 Fournisseur de trame pour les métiers à tisser avec un dispositif pour mésurer des fils de réserve

Country Status (4)

Country Link
EP (1) EP1577246B1 (fr)
CN (1) CN1670284B (fr)
DE (1) DE602005001459T2 (fr)
IT (1) ITTO20040176A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20050810A1 (it) * 2005-11-18 2007-05-19 Lgl Electronics Spa Rilevatore di scorta trama per dispositivi alimentatori di trama
CN102433661A (zh) * 2010-09-29 2012-05-02 吴江市吴中布业有限公司 双工位进纱装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796386A (en) * 1973-04-11 1974-03-12 K Tannert Thread feeder for textile machines
EP0171516B1 (fr) * 1984-08-16 1989-03-08 Aktiebolaget Iro Dispositif pour emmagasiner et délivrer un fil
CN1009912B (zh) * 1985-05-09 1990-10-10 Iro有限公司 纱线存储和喂给装置
US5211347A (en) * 1990-06-29 1993-05-18 Sobrevin Societe De Brevets Industriels-Etablissement Thread feed device
IT1267157B1 (it) * 1994-11-22 1997-01-28 Lgl Electronics Spa Dispositivo e metodo perfezionati per la sorveglianza della riserva di filato negli apparecchi alimentatori di trama.
EP0900363B1 (fr) * 1996-05-23 2002-04-10 Iro Ab Procede de commande d'un detecteur numerique et detecteur numerique correspondant
ITTO20020735A1 (it) * 2002-08-21 2004-02-22 L G L Electronics Spa Metodo di rilevazione dello stallo del motore del

Also Published As

Publication number Publication date
CN1670284B (zh) 2010-11-03
ITTO20040176A1 (it) 2004-06-17
CN1670284A (zh) 2005-09-21
EP1577246A1 (fr) 2005-09-21
DE602005001459T2 (de) 2008-03-06
DE602005001459D1 (de) 2007-08-09

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