EP1577246A1 - 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
EP1577246A1
EP1577246A1 EP05002742A EP05002742A EP1577246A1 EP 1577246 A1 EP1577246 A1 EP 1577246A1 EP 05002742 A EP05002742 A EP 05002742A EP 05002742 A EP05002742 A EP 05002742A EP 1577246 A1 EP1577246 A1 EP 1577246A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
feeder
finger
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.)
Granted
Application number
EP05002742A
Other languages
German (de)
English (en)
Other versions
EP1577246B1 (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
Original Assignee
LGL Electronics SpA
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Filing date
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
Anticipated expiration legal-status Critical

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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 main object of the present invention is to overcome the above drawbacks of the known systems for measuring the weft reserve by providing a weft feeder for weaving machines provided with a device which is capable of directly measuring the presence of a suitable reserve on the cylinder, i.e., which is not influenced by any miscounts of the number of loops which are wound/unwound upon/from 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)
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 2004-03-17
ITTO20040176 ITTO20040176A1 (it) 2004-03-17 2004-03-17 Alimentatore di trama per telai di tessitura con dispositivo di rilevamento della scorta

Publications (2)

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

Family

ID=34835621

Family Applications (1)

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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1788129A2 (fr) * 2005-11-18 2007-05-23 L.G.L. Electronics S.p.A. Dispositif pour contrôler la reserve de fil pour fournisseurs de trame

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (5)

* 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
US4676442A (en) * 1984-08-16 1987-06-30 Aktiebolaget Iro Yarn accumulation and feeding apparatus
US5211347A (en) * 1990-06-29 1993-05-18 Sobrevin Societe De Brevets Industriels-Etablissement Thread feed device
EP0713838A2 (fr) * 1994-11-22 1996-05-29 L.G.L. ELECTRONICS S.p.A. Dispositif et procédé pour surveiller la réserve de fil dans des fournisseurs de trame
US6123281A (en) * 1996-05-23 2000-09-26 Iro Ab Yarn feeder having at least one yarn sensor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1009912B (zh) * 1985-05-09 1990-10-10 Iro有限公司 纱线存储和喂给装置
ITTO20020735A1 (it) * 2002-08-21 2004-02-22 L G L Electronics Spa Metodo di rilevazione dello stallo del motore del

Patent Citations (5)

* 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
US4676442A (en) * 1984-08-16 1987-06-30 Aktiebolaget Iro Yarn accumulation and feeding apparatus
US5211347A (en) * 1990-06-29 1993-05-18 Sobrevin Societe De Brevets Industriels-Etablissement Thread feed device
EP0713838A2 (fr) * 1994-11-22 1996-05-29 L.G.L. ELECTRONICS S.p.A. Dispositif et procédé pour surveiller la réserve de fil dans des fournisseurs de trame
US6123281A (en) * 1996-05-23 2000-09-26 Iro Ab Yarn feeder having at least one yarn sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1788129A2 (fr) * 2005-11-18 2007-05-23 L.G.L. Electronics S.p.A. Dispositif pour contrôler la reserve de fil pour fournisseurs de trame
EP1788129A3 (fr) * 2005-11-18 2009-04-29 L.G.L. Electronics S.p.A. Dispositif pour contrôler la reserve de fil pour fournisseurs de trame

Also Published As

Publication number Publication date
CN1670284A (zh) 2005-09-21
DE602005001459D1 (de) 2007-08-09
EP1577246B1 (fr) 2007-06-27
DE602005001459T2 (de) 2008-03-06
CN1670284B (zh) 2010-11-03
ITTO20040176A1 (it) 2004-06-17

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