EP1624098B1 - Weft feeder for looms provided with a self-governing braking device - Google Patents

Weft feeder for looms provided with a self-governing braking device Download PDF

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Publication number
EP1624098B1
EP1624098B1 EP20050013200 EP05013200A EP1624098B1 EP 1624098 B1 EP1624098 B1 EP 1624098B1 EP 20050013200 EP20050013200 EP 20050013200 EP 05013200 A EP05013200 A EP 05013200A EP 1624098 B1 EP1624098 B1 EP 1624098B1
Authority
EP
European Patent Office
Prior art keywords
drum
frustoconical
braking
annular support
elastic elements
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.)
Active
Application number
EP20050013200
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1624098A2 (en
EP1624098A3 (en
Inventor
Pietro Zenoni
Rosario Castelli
Giovanni Pedrini
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 EP1624098A2 publication Critical patent/EP1624098A2/en
Publication of EP1624098A3 publication Critical patent/EP1624098A3/en
Application granted granted Critical
Publication of EP1624098B1 publication Critical patent/EP1624098B1/en
Active 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

Definitions

  • the present invention relates to a weft feeder for looms provided with a self-governing braking device.
  • a general weft feeder for looms comprises a stationary cylinder on which a motorized swivel arm winds a plurality of yarn loops forming a weft reserve.
  • the yarn while unwinding from the cylinder to feed the loom, is braked by a self-governing braking device of the type described in IT-U-1 251 209 and EP-A-1059375 .
  • This device comprises a frustoconical braking member that is coaxial to the drum and is elastically biased, with its inner surface, against a beveled delivery edge of the drum.
  • the braking member is supported at the middle of a spider assembly of helical springs pulling on ring carried on a support that is axially movable for adjusting the static pressure applied by the frustoconical braking member upon the drum at rest.
  • the yarn flies between the drum and the braking member so that the axial component of its tension, which is proportional to the yarn speed, is applied upon the braking member. Accordingly, when the speed is increased, the braking member is axially drawn away from the drum, with automatic reduction of the braking action.
  • the yarn speed may reach very high values, with quick accelerations from 0 to 2500 m/min.
  • the above described braking device is unsatisfactory from the standpoint of feedback at the peaks of speed of the yarn, because when the latter accelerates the cone is supposed to move away as quickly as possible in order to adapt the braking action to the new yarn speed.
  • a weft feeder 10 comprises a motor housing 11 which coaxially supports a stationary drum 12 on which a motorized swivel arm 13 winds a plurality of yarn loops (not shown) forming a weft reserve.
  • the yarn is unwound from drum 12 via a yarn-guide eyelet 14 coaxial to the drum.
  • the tension of the yarn unwinding from the drum is modulated by a braking device comprising a frustoconical braking member 16 arranged with its larger perimeter in front of the end of drum 12, which is provided with a beveled delivery edge 12r.
  • Frustoconical braking member 16 is supported at the middle of a spider assembly of helical springs 18 which are hooked to braking member 16, at the smaller perimeter thereof, with one of their ends, and to an annular support 19 with the opposite end.
  • the length of springs 18, at rest is equal to, or higher than, the span between their hooking point on frustoconical member 16 and their hooking point on annular support 19, i.e.: L ⁇ D ⁇ 2 - D ⁇ 1 2 , where L is the length of the spring at rest, D1 is the hooking diameter for the spring on braking member 16, and D2 is the hooking diameter for the spring on annular support 19.
  • Annular support 19 is carried on a slide 20 which is slidably supported along an axial direction on a stationary arm 21 integral with motor housing 11, under control of a screw gear (not shown) operable by a knob 22.
  • Knob 22 is operable for adjusting the static pressure applied by the frustoconical braking member upon the drum.
  • frustoconical member 16 when frustoconical member 16 is at rest, it will lie aslant against stationary drum 16. By operating knob 22, frustoconical member 16 moves towards drum 12 and geometrically engages beveled delivery edge 12r without springs 18 being extended, thereby achieving an accurate alignement.
  • springs 18 only act as hooking means for braking 16, without affecting the alignement.
  • the knob is further operated to pull the springs, as shown in Fig. 4 .
  • FIG. 5 An alternative embodiment of the invention is shown in Fig. 5 , where the springs are substituted by elastic ropes of a synthetic material 118 whose length, when at rest, is equal to, or higher than, the span between their hooking point on frustoconical member 16 and their hooking point on annular support 19, similarly to the previous embodiment.
  • the braking device according to the invention has a high reactivity even when the yarn reaches its speed peaks, due to the transition of the elastic means from a released condition to an extended condition, while the formation of the ballon, which is liable to form when the yarn is unwound from the drum, is also controlled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20050013200 2004-08-05 2005-06-18 Weft feeder for looms provided with a self-governing braking device Active EP1624098B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20040105 ITTO20040105U1 (it) 2004-08-05 2004-08-05 Alimentatore di trama per telai di tessitura provvisto di dispositivo di frenatura auto-regolante

Publications (3)

Publication Number Publication Date
EP1624098A2 EP1624098A2 (en) 2006-02-08
EP1624098A3 EP1624098A3 (en) 2006-11-02
EP1624098B1 true EP1624098B1 (en) 2009-10-14

Family

ID=35311757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050013200 Active EP1624098B1 (en) 2004-08-05 2005-06-18 Weft feeder for looms provided with a self-governing braking device

Country Status (4)

Country Link
EP (1) EP1624098B1 (it)
CN (1) CN1730753B (it)
DE (1) DE602005017100D1 (it)
IT (1) ITTO20040105U1 (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102251339B (zh) * 2011-07-21 2013-04-17 北京经纬纺机新技术有限公司 喷气织机止纱销控制器及其控制方法
EP2993260B1 (en) * 2014-09-05 2017-04-19 L.G.L. Electronics S.p.A. Yarn feeder with rotary storage drum and yarn-unwinding sensor
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
CN110886045B (zh) * 2019-12-05 2021-09-28 浙江更土电子商务有限公司 一种织布机送纱装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1251209B (it) * 1991-09-20 1995-05-04 Lgl Electronics Spa Dispositivo di frenatura autoregolante del filato per apparecchi alimentatori di trama.
DE19846221A1 (de) * 1998-10-07 2000-04-13 Iro Patent Ag Baar Fadenbremse und Fadenliefergerät mit einer Fadenbremse
IT1308067B1 (it) * 1999-06-01 2001-11-29 Lgl Electronics Spa Dispositivo di frenatura del filato, per alimentatore di trama,avente tempi di intervento ridotti
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
CN2558669Y (zh) * 2002-05-18 2003-07-02 绍兴市联创电器有限公司 一种同轴纱线张力调节装置
ITTO20030833A1 (it) * 2003-10-23 2005-04-24 Lgl Electronics Spa Perfezionamento ai dispositivi di frenatura modulata degli apparecchi alimentatori di trama a macchine tessili.

Also Published As

Publication number Publication date
EP1624098A2 (en) 2006-02-08
ITTO20040105U1 (it) 2004-11-05
DE602005017100D1 (de) 2009-11-26
CN1730753A (zh) 2006-02-08
EP1624098A3 (en) 2006-11-02
CN1730753B (zh) 2010-12-22

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