EP1724384A1 - Fadenbremsvorrichtung im Schussfaden-Liefergerät für Textilmaschinen - Google Patents

Fadenbremsvorrichtung im Schussfaden-Liefergerät für Textilmaschinen Download PDF

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Publication number
EP1724384A1
EP1724384A1 EP06005694A EP06005694A EP1724384A1 EP 1724384 A1 EP1724384 A1 EP 1724384A1 EP 06005694 A EP06005694 A EP 06005694A EP 06005694 A EP06005694 A EP 06005694A EP 1724384 A1 EP1724384 A1 EP 1724384A1
Authority
EP
European Patent Office
Prior art keywords
yarn
edge
drum
braking
weft
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
EP06005694A
Other languages
English (en)
French (fr)
Other versions
EP1724384B1 (de
Inventor
Giovanni Pedrini
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
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 EP1724384A1 publication Critical patent/EP1724384A1/de
Application granted granted Critical
Publication of EP1724384B1 publication Critical patent/EP1724384B1/de
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
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/366—Conical

Definitions

  • the present invention relates to a yarn-braking device in weft feeders for textile machines.
  • yarn feeders for textile machines comprise a stationary drum on which a motorized swivel arm winds a plurality of yarn loops forming a weft reserve.
  • the loops are unwound from the drum, then pass through a braking assembly which controls the tension of the yarn in order to maintain it substantially constant, and finally are fed to the loom.
  • the braking member typically comprises a frustoconical hollow member which is coaxially supported with its larger base facing the drum, and is biased with its inner surface against the end of the drum, from which the loops are unwound.
  • the unwinding yarn runs between the drum and the frustoconical member, which apply the desired braking action upon the yarn.
  • the frustoconical member is made of a limitedly deformable material, such as a tissue or a laminated plastic impregnated with a polymeric resin, so that it can be warped by the running yarn, whereby the pressure upon the drum is maintained substantially constant.
  • the unwinding yarn which is subject to the centrifugal force, is liable to enter the annular gap between the anti-balloon ring and the larger base of the frustoconical member.
  • This circumstance causes the yarn, which is projected outwards, to glide against the edge of the larger base of the braking member, thereby causing the latter to progressively wear and the correct operation of the braking member to be consequently affected.
  • the edge of the larger base of the frustoconical member is also at risk of damages during the manual installation of the braking member.
  • such operation is carried out manually by means of a tool having a hook-shaped end portion which may get entangled with the edge of the frustoconical member, thereby scratching the frustoconical member.
  • a yarn feeder 10 for textile machines comprises a stationary, weft-storing drum 12 on which a swivel arm 14 driven by a motor 15 winds a plurality of yarn loops forming a weft reserve RT.
  • the delivery edge of drum 12 is beveled in 12a.
  • yarn F is unwound from drum 12 and passes through a yarn-guide eyelet 16, which is supported coaxially with drum 12 by a stationary arm 17 projecting from the motor housing in a direction parallel to the axis of the drum.
  • Stationary arm 17 also supports a braking assembly 18 having the task of controlling the tension of the yarn while unwinding from drum 12, in order to maintain it substantially constant.
  • braking assembly 18 comprises an annular support 20 supported coaxially with drum 12 by a slide 22 that is slidable along stationary arm 17 under control of a worm-screw mechanism (not shown) operable by a knob 24.
  • a frustoconical hollow member 26 is supported at the center of annular support 20 by a spider-assembly of springs 28 (only diagrammatically shown in the Figures) each having one end anchored to support 20 and the opposite end anchored to the smaller base of frustoconical member 26.
  • the frustoconical member is arranged with its larger base facing the drum and is elastically biased with its inner surface against beveled edge 12a.
  • Frustoconical member 26 is preferably made of a tissue or laminated plastic impregnated with a polymeric resin, and its contact area with the drum is lined with an inner, wearproof lining consisting of a metal foil 29 (Fig. 2) applied on the edge 26a of the larger base of the frustoconical member.
  • Stationary drum 17 also supports an anti-balloon ring 30 surrounding drum 12 upstream of frustoconical member 26.
  • An annular gap L is defined between anti-balloon ring 30 and the larger base of the frustoconical member.
  • yarn F runs between beveled edge 12a of drum 12 and frustoconical member 26, which apply the desired braking action upon it.
  • knob 24 By operating knob 24, the static contact pressure applied upon the drum by the frustoconical member may be adjusted.
  • edge 26a of the larger base of frustoconical member 26 is lined with a protection ring 32 having an inner, circumferential slot 34 projecting in the direction of the generatrices of the cone, in which edge 26a is received.
  • the height H of slot 34 is slightly greater then the thickness S of frustoconical member 26 in the area lined with the wearproof foil 29. Therefore, the frustoconical member is not stiffened by ring 32 and, consequently, the frustoconical member can be freely warped by the running yarn F, as required for maintaining the pressure upon the drum substantially uniform and constant.
  • Protection ring 32 is molded from an elastomeric material, preferably polyurethan, so that it can be elastically expanded to be manually mounted on edge 26a, thereby making it easier to install the ring and to replace it.
  • slot 34 is defined between two parallel, circumferential lips 32a, 32b which engage the opposite surfaces of edge 26a.
  • outer lip 32a protrudes beyond inner lip 32b, for easier handling of the ring during installation.
  • protection ring 32 protects edge 26a of the frustoconical member and its wearproof lining 29 from the wearing action of yarn F.
  • edge 26a is freely received within the slot of the protection ring, the frustoconical member can be freely warped by the running yarn, which circumstance allows the braking action to be uniform.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20060005694 2005-05-18 2006-03-21 Fadenbremsvorrichtung im Schussfaden-Liefergerät für Textilmaschinen Not-in-force EP1724384B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20050063 ITTO20050063U1 (it) 2005-05-18 2005-05-18 Perfezionamento ad un dispositivo di frenatura del filato in alimentatori di trama per macchine tessili

Publications (2)

Publication Number Publication Date
EP1724384A1 true EP1724384A1 (de) 2006-11-22
EP1724384B1 EP1724384B1 (de) 2008-04-30

Family

ID=36754077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060005694 Not-in-force EP1724384B1 (de) 2005-05-18 2006-03-21 Fadenbremsvorrichtung im Schussfaden-Liefergerät für Textilmaschinen

Country Status (4)

Country Link
EP (1) EP1724384B1 (de)
CN (1) CN1865110B (de)
DE (1) DE602006001031T2 (de)
IT (1) ITTO20050063U1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2623650B1 (de) * 2012-02-02 2015-03-11 Iro Ab Fadenbremse für Vorspulgerät
IT201700043202A1 (it) * 2017-04-20 2018-10-20 Lgl Electronics Spa Dispositivo frena-trama per alimentatori di filato ad accumulo, ed alimentatore impiegante tale dispositivo frena-trama
CN112609299B (zh) * 2020-12-10 2022-08-19 青岛村田机械制造有限公司 一种在操作时避免储纬器处断纬或漏纬的纺织储纬装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112899A (en) * 1961-07-21 1963-12-03 Essex Wire Corp Wire-unwinding device
EP0536088A1 (de) * 1991-09-20 1993-04-07 L.G.L. ELECTRONICS S.p.A. Modulierte Fadenbremse für eine Schussfadenliefervorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1263623B (it) * 1993-02-23 1996-08-27 Roj Electrotex Nuova Srl Alimentatore di filo
DE9406102U1 (de) * 1994-04-13 1995-08-10 Sobrevin Fadenspeicher mit Fadenabzugsbremse
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112899A (en) * 1961-07-21 1963-12-03 Essex Wire Corp Wire-unwinding device
EP0536088A1 (de) * 1991-09-20 1993-04-07 L.G.L. ELECTRONICS S.p.A. Modulierte Fadenbremse für eine Schussfadenliefervorrichtung

Also Published As

Publication number Publication date
CN1865110A (zh) 2006-11-22
DE602006001031D1 (de) 2008-06-12
CN1865110B (zh) 2011-09-07
ITTO20050063U1 (it) 2006-11-19
DE602006001031T2 (de) 2008-08-14
EP1724384B1 (de) 2008-04-30

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