EP1526102B1 - Braking device of weft feeders for textile machines - Google Patents

Braking device of weft feeders for textile machines Download PDF

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Publication number
EP1526102B1
EP1526102B1 EP20040022315 EP04022315A EP1526102B1 EP 1526102 B1 EP1526102 B1 EP 1526102B1 EP 20040022315 EP20040022315 EP 20040022315 EP 04022315 A EP04022315 A EP 04022315A EP 1526102 B1 EP1526102 B1 EP 1526102B1
Authority
EP
European Patent Office
Prior art keywords
braking
drum
roughness
skirt
frustoconical
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
EP20040022315
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1526102A1 (en
Inventor
Pietro Zenoni
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
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 EP1526102A1 publication Critical patent/EP1526102A1/en
Application granted granted Critical
Publication of EP1526102B1 publication Critical patent/EP1526102B1/en
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
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/366—Conical

Definitions

  • the present invention generally relates to weft feeders for textile machines and is concerned with an improvement to modulated braking devices for said weft feeders.
  • this invention relates to weft feeders of the type disclosed in the prior patent US 6 269 843 A , which comprise a stationary drum, on which is stored a weft reserve in form of yarn loops, and a braking member having a circular profile, typically a frustoconical member.
  • the stationary drum has a cylindrical skirt and a plane front surface which is connected to the skirt by a rounded annular surface.
  • the frustoconical braking member is coaxially supported on elastic means in front of the drum of the feeder, and is biased by said elastic means to elastically and adjustably engage said rounded annular surface with its main section, along a tangency circumference of the drum which is slightly smaller in diameter than the main circumference of the drum.
  • the yam runs between the drum and the braking member along a sloping path extending between the tangency circumference of the drum and a yarn-guiding eyelet that is arranged nearby the smaller section of the braking member.
  • the braking member applies a self-adjusting braking action upon the unwinding yarn, whose intensity changes as a function of the variations of the speed and mechanical tension of the yam; the braking action can also be adjusted by means of electric means or linear/rotary electro-dynamical means supplied by a current that is modulated as a function of the variations of the mechanical tension of the yarn.
  • the frustoconical braking member is made of a metal sheet, fibers or laminated plastic impregnated with epoxy resins, and has an inner surface having a degree of roughness in the range 0,8 to 1,2 microns, which is to contact the yarn while circularly moving in the braking member.
  • the cylindrical surface of the skirt of the drum is also treated with this relatively high degree of roughness for better accuracy during the unwinding run of the yarn.
  • al lower degree of roughness results in a higher friction coefficient, due to a higher number of micro-contact points between the yarn and the surface of the drum, so that the accuracy of the circular movement of the yarn along said surface, and eventually the accuracy of the unwinding run of the yarn, are adversely affected.
  • the degree of roughness of the surface of the cylindrical drum should be reduced to values in the range 0,2 to 0,4 microns, e.g. by polishing, to prevent the yam from cracking while running through the braking device.
  • a main object of the present invention is to provide an improved braking device which allows the braking action upon the yarn to be considerably strengthened and, at the same time, does not adversely affect the accuracy of the unwinding run of the yarn.
  • a modulated braking device characterized in that it has a stationary drum with a cylindrical skirt having an outer surface which has different degrees of roughness, with an annular braking band having a lower degree of roughness and extending along the rounded annular surface, on the area that is to be engaged by the frustoconical braking member; and with the residual surface portion of the skirt, outside the braking band, having a higher degree of roughness.
  • the higher degree of roughness of said surface portion of the skirt outside the braking band is in the range 0,8 to 1,2 microns, and the degree of roughness of the braking band is in the range 0,2 to 0,4 microns.
  • the braking band is preferably made by polishing a layer of a thick chromium plating, and symmetrically extends on both sides of the tangency circumference of the frustoconical braking member with the drum, along spans having a predetermined width.
  • a weft feeder 10 of a known type comprises a drum 11 having a cylindrical skirt M and a plane front surface SP that is connected to the skirt by a rounded annular surface SR.
  • a hollow swivel arm 12 is attached to a rotary disc 13 arranged at the base of the drum and winds a plurality of yarn loops SF on the drum to form a weft reserve.
  • braking part 15 comprises a frustoconical braking member 16 made of a metal sheet, synthetic fabric or laminated plastic impregnated with a polymeric resin, which is arranged in front of drum 11.
  • the frustoconical member is tangent to the drum along a tangency circumference of rounded annular surface SR which is slightly smaller in diameter than the main circumference of the drum.
  • frustoconical braking member 16 is biased against drum 11 to brake the yarn unwinding from the drum with a predetermined elastic force, so-called static tension.
  • Support 17 is carried on a slide 18 that is axially movable with respect to drum 11 and is operatable by a screw drive 19 for the purpose of adjusting the static tension.
  • cylindrical skirt M of stationary drum 11 has an outer surface which has different degrees of roughness, with an annular braking band FF having a lower degree of roughness and extending along rounded annular surface SR, and with a residual surface portion, outside the braking band, which has a higher degree of roughness.
  • the higher degree of roughness of said surface portion of skirt M outside braking band FF is in the range 0,8 to 1,2 microns, and the degree of roughness of braking band FF is in the range 0,2 to 0,4 microns.
  • the braking band is preferably made by polishing a layer of a thick chromium plating, has a predetermined width H, e.g. in the range 3 to 7 mm, and symmetrically extends on both sides of the tangency circumference of the drum of the feeder, along equal spans H/2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20040022315 2003-10-23 2004-09-20 Braking device of weft feeders for textile machines Expired - Lifetime EP1526102B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20030833 2003-10-23
ITTO20030833 ITTO20030833A1 (it) 2003-10-23 2003-10-23 Perfezionamento ai dispositivi di frenatura modulata degli apparecchi alimentatori di trama a macchine tessili.

Publications (2)

Publication Number Publication Date
EP1526102A1 EP1526102A1 (en) 2005-04-27
EP1526102B1 true EP1526102B1 (en) 2008-01-23

Family

ID=34385842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040022315 Expired - Lifetime EP1526102B1 (en) 2003-10-23 2004-09-20 Braking device of weft feeders for textile machines

Country Status (4)

Country Link
EP (1) EP1526102B1 (zh)
CN (1) CN1609303B (zh)
DE (1) DE602004011444T2 (zh)
IT (1) ITTO20030833A1 (zh)

Families Citing this family (1)

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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
IT235945Y1 (it) * 1995-09-28 2000-07-18 Lgl Electronics Spa Apparecchio alimentatore di trama per macchine tessili, con mezziantiusura di protezione del dispositivo di sorveglianza della riserva
SE9700666D0 (sv) * 1997-02-24 1997-02-24 Iro Ab Fadenliefergerät und fadenbremse
IT1292765B1 (it) * 1997-06-11 1999-02-11 Lgl Electronics Spa Perfezionamento ai dispositivi di frenatura modulata autoregolata del filato per apparecchi alimentatori di trama a macchine tessili
IT1295624B1 (it) * 1997-10-15 1999-05-24 Roj Electrotex Nuova Srl Dispositivo di frenatura per filati in alimentatori di trama ed elemento frenante per detto dispositivo
ITTO20001119A1 (it) * 2000-12-01 2002-06-01 Lgl Electronics Spa Corpo frenante perfezionato per dispositivi di frenatura autoregolante del filato di apparecchi alimentatori di trama e suo procedimento di
ITTO20010260A1 (it) * 2001-03-20 2002-09-20 Lgl Electronics Spa Dispositivo di frenatura autoregolante per apparecchi alimentatori ditrama.

Also Published As

Publication number Publication date
CN1609303B (zh) 2010-09-01
DE602004011444D1 (de) 2008-03-13
CN1609303A (zh) 2005-04-27
ITTO20030833A1 (it) 2005-04-24
DE602004011444T2 (de) 2009-01-15
EP1526102A1 (en) 2005-04-27

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