EP1371594A1 - Schussfaden-Liefergerät für Webmaschinen - Google Patents

Schussfaden-Liefergerät für Webmaschinen Download PDF

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Publication number
EP1371594A1
EP1371594A1 EP03011582A EP03011582A EP1371594A1 EP 1371594 A1 EP1371594 A1 EP 1371594A1 EP 03011582 A EP03011582 A EP 03011582A EP 03011582 A EP03011582 A EP 03011582A EP 1371594 A1 EP1371594 A1 EP 1371594A1
Authority
EP
European Patent Office
Prior art keywords
tube
feeder
cylinder
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
EP03011582A
Other languages
English (en)
French (fr)
Other versions
EP1371594B1 (de
Inventor
Giovanni Pedrini
Rosario Castelli
Ruggero Magoni
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP1371594A1 publication Critical patent/EP1371594A1/de
Application granted granted Critical
Publication of EP1371594B1 publication Critical patent/EP1371594B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • 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
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the present invention relates to a weft feeder for weaving machines, provided with a device for separating the loops on the cylinder.
  • weft feeders for weaving machines comprise a stationary cylinder, on which a swivel arm operated by a motor winds a plurality of thread loops forming a weft reserve.
  • the driving shaft is hollow and the thread runs inside it.
  • the thread exits through an outlet made on a middle section of the shaft, passes through a channel extending along a generatrix of a frustoconical plate constituting said weft-winding arm and keyed to the shaft, and then is wound on the cylinder.
  • the loops are unwound from the cylinder and are fed to the loom via a braking device adapted to keep the tension of the thread substantially constant.
  • two complementary, frustoconical crowns are employed, in which are agglomerated respective permanent, counter-polarized magnets.
  • One of the crowns is frontally fastened to the motor housing, the other one to the cylinder.
  • Certain small-sized feeders in which, e.g., the circle followed by the outlet of the weft-winding arm is under 200 mm in diameter, are provided with a transport system adapted to progressively shift the loops, during unwinding, from the base to the head of the cylinder, thereby separating the loops from one another.
  • the system substantially comprises a reel of rods adapted to cyclically rise through corresponding longitudinal slots of the cylinder.
  • the rods are driven by a skew bush keyed to the driving shaft.
  • the rocking motion of the device affects the cylinder's motion and causes the latter to be deviated from its angular position about the motor housing.
  • neodymium-based magnets have been introduced whose magnetic force, for equal sizes, is three to five times as large as the traditional, ferrite-based magnets.
  • the inertial force upon the weft-winding arm must be reduced.
  • the arm must be rigid in order to prevent any collisions or frictions while swiveling between the crowns, due to the centrifugal force or vibrations. Accordingly, such arms are made of aluminum, but this measure prevents providing such feeders with the device for separating the loops.
  • the neodymium-based magnets which are used for firmly fastening the cylinder to the motor housing in the presence of such device, cannot be used in that they generate high induced currents in the aluminum arm, thereby causing the arm to be heated up to over 60 °C, which heating is harmful for the thread.
  • a main object of the present invention is to remove such drawback of the known devices by providing a weft feeder for weaving machines, which is provided with a device for separating the loops on the cylinder, in which the cylinder is firmly secured to the motor housing independently of its size.
  • This object is particularly desirable with large-size weft-feeders, e.g. over 250 mm in diameter.
  • Another object of this invention is to provide a weft feeder which is unexpensive and may be manufactured easily and by means of equipment commonly employed in this field.
  • a weft feeder 10 comprises a motor housing 11 and a cylinder 12 on which a rectilinear, tubular swivel arm 13 winds a plurality of yarn loops forming a weft reserve.
  • Swivel arm 13 obliquely projects from a hub 14 keyed to a driving shaft 15.
  • Driving shaft 15 is hollow and the thread F runs inside it.
  • Tube 13 is made of a composite material obtained by pultrusion, and one of its ends engages an oblique channel 16 of hub 14. The channel terminates into an opening 17 made on a middle section of shaft 15. Accordingly, the thread passes through driving shaft 15, exit through opening 17, runs inside tube 13 and exits through the free end 18 of the latter to be wound on cylinder 12.
  • a ceramic bush 19 with beveled edges engages the free end 18 of tube 13.
  • a further ceramic bush 50 engages opening 17.
  • hub 14 supports a false tube 47 that is symmetrically arranged with respect to tube 13. Weight, shape and inertia of false tube 47 are equal to tube 13.
  • breaking device also not shown
  • first magnets 20 are housed in respective first seats 24, along a circumferential groove 23 made on a concave surface 24 of a substantially frustoconical crown 25, which is coaxially fastened to motor housing 11.
  • Second permanent magnets 21 are housed in respective second seats such as 26, which are attached to a support 27 fastened to a base 28 of cylinder 12 by screws 29, and face the first magnets.
  • second permanent magnets 21 define a convex, frustoconical surface 30 matching the internal surface 24 of crown 25.
  • Support 27 is pivotally supported on a middle portion 29 of driving shaft 15 by means of bearings 45.
  • Feeder 10 is provided with a device for separating the loops on cylinder 12.
  • the latter consists of six sections 33 each provided with four longitudinal grooves 34, through which cyclically rise respective rods 35 adapted to progressively displace the loops from the base to the head of cylinder 12.
  • Each section 33 is fastened to base 28 by means of a tongue 46 engaging a corresponding radial groove 135 frontally made on base 28.
  • Tongue 46 is lockable at predetermined radial positions by means of screws 36, for adjustment of diameter of cylinder 12.
  • Rods 35 are assembled in sets of four rods, thereby forming six combs such as 37 which are supported on a star-shaped support 38 which is fastened do a flange 48.
  • the latter is pivotally supported on a skew bush 40 by means of bearings 39.
  • Skew bush 40 is keyed to the end portion 41 of driving shaft 15.
  • Each comb 37 holds a spoke 42 engaging a respective radial groove 43 frontally made along a beam 44 of star-shaped support 38.
  • Each spoke is lockable in its radial position by means of screws 49, so that the reel of combs can be adjusted in diameter in relation to the diameter of cylinder 12.
  • the rotation exerted by driving shaft 15 upon skew bush 40 causes support 38 to rock without rotating, and each set of rods 35 to cyclically rise through respective grooves 34.
  • a weft feeder for weaving machines provided with a device for separating the loops on the cylinder, in which the cylinder is firmly fastened to the motor housing independently of the size of the feeder.
  • tube 13 being made of a composite material obtained by pultrusion and having a high mechanical rigidity and low electrical conductivity, avoids the generation of induced currents. Consequently, neodymium-based magnets can be used and the device for separating the thread loops can be also employed in large-size weft feeders, e.g. over 250 mm in diameter.
  • a further advantage of the device according to this invention is that it is easy and cheap to manufacture, because the materials obtained by pultrusion are manufactured in large scale in continuous production lines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)
EP03011582A 2002-06-11 2003-05-22 Schussfaden-Liefergerät für Webmaschinen Expired - Lifetime EP1371594B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20020490 2002-06-11
IT2002TO000490A ITTO20020490A1 (it) 2002-06-11 2002-06-11 ,,alimentatore di trama per macchine tessili con dispositivo di separazione delle spire sul tamburo,,

Publications (2)

Publication Number Publication Date
EP1371594A1 true EP1371594A1 (de) 2003-12-17
EP1371594B1 EP1371594B1 (de) 2007-01-24

Family

ID=27639151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03011582A Expired - Lifetime EP1371594B1 (de) 2002-06-11 2003-05-22 Schussfaden-Liefergerät für Webmaschinen

Country Status (4)

Country Link
EP (1) EP1371594B1 (de)
CN (1) CN1468993A (de)
DE (1) DE60311354T2 (de)
IT (1) ITTO20020490A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005100221A1 (en) * 2004-04-15 2005-10-27 Iro Ab Yarn feeder
BE1025266B1 (nl) * 2017-05-30 2019-01-07 Picanol Nv Inslagtoevoerinrichting met blokkeerstand

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20050469A1 (it) * 2005-07-07 2007-01-08 L G L Elecrtronics S P A Dispositivo di recupero del filato per macchine tessili
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
BE1022755B1 (nl) * 2015-01-26 2016-08-30 Picanol Draadscheidingsmechanisme voor een inslagtoevoerinrichting
CN105256447B (zh) * 2015-10-31 2017-12-01 苏州华哥电器科技有限公司 一种储纬器及其储纬方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759300A (en) * 1971-03-04 1973-09-18 Sulzer Ag Intermediate weft thread supply apparatus for looms
US4476904A (en) * 1981-12-26 1984-10-16 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Device for measuring the length of a weft
EP0469527A1 (de) * 1990-08-03 1992-02-05 ROJ ELECTROTEX S.p.A. Schussfadenspeicher für Luftwebmaschinen mit einer Aufwickeltrommel, deren Durchmesser verstellbar ist
EP0754645A1 (de) * 1995-07-18 1997-01-22 L.G.L. ELECTRONICS S.p.A. Elektropneumatische Vorrichtung zum automatischen Einfädeln eines Schussfadenzubringers und Schussfadenzubringer der diese Vorrichtung enthält
US6395210B1 (en) * 1999-05-12 2002-05-28 A&P Technology, Inc. Pultrusion method and device for forming composites using pre-consolidated braids

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759300A (en) * 1971-03-04 1973-09-18 Sulzer Ag Intermediate weft thread supply apparatus for looms
US4476904A (en) * 1981-12-26 1984-10-16 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Device for measuring the length of a weft
EP0469527A1 (de) * 1990-08-03 1992-02-05 ROJ ELECTROTEX S.p.A. Schussfadenspeicher für Luftwebmaschinen mit einer Aufwickeltrommel, deren Durchmesser verstellbar ist
EP0754645A1 (de) * 1995-07-18 1997-01-22 L.G.L. ELECTRONICS S.p.A. Elektropneumatische Vorrichtung zum automatischen Einfädeln eines Schussfadenzubringers und Schussfadenzubringer der diese Vorrichtung enthält
US6395210B1 (en) * 1999-05-12 2002-05-28 A&P Technology, Inc. Pultrusion method and device for forming composites using pre-consolidated braids

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005100221A1 (en) * 2004-04-15 2005-10-27 Iro Ab Yarn feeder
BE1025266B1 (nl) * 2017-05-30 2019-01-07 Picanol Nv Inslagtoevoerinrichting met blokkeerstand
CN110678592A (zh) * 2017-05-30 2020-01-10 必佳乐公司 纬纱供给器装置
CN110678592B (zh) * 2017-05-30 2021-09-24 必佳乐公司 纬纱供给器装置

Also Published As

Publication number Publication date
ITTO20020490A1 (it) 2003-12-11
EP1371594B1 (de) 2007-01-24
DE60311354D1 (de) 2007-03-15
DE60311354T2 (de) 2007-11-29
ITTO20020490A0 (it) 2002-06-11
CN1468993A (zh) 2004-01-21

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