EP1717181B1 - Garnbremssystem in Schussfadenliefervorrichtungen für Textilmaschinen - Google Patents

Garnbremssystem in Schussfadenliefervorrichtungen für Textilmaschinen Download PDF

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Publication number
EP1717181B1
EP1717181B1 EP20060003897 EP06003897A EP1717181B1 EP 1717181 B1 EP1717181 B1 EP 1717181B1 EP 20060003897 EP20060003897 EP 20060003897 EP 06003897 A EP06003897 A EP 06003897A EP 1717181 B1 EP1717181 B1 EP 1717181B1
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EP
European Patent Office
Prior art keywords
braking member
drum
magnetic
yarn
support
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
EP20060003897
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English (en)
French (fr)
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EP1717181A1 (de
Inventor
Rosario Castelli
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
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LGL Electronics SpA
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Publication date
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Publication of EP1717181A1 publication Critical patent/EP1717181A1/de
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Publication of EP1717181B1 publication Critical patent/EP1717181B1/de
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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.
  • weft 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 and are fed to the loom via a braking assembly which controls the tension of the yarn in order to keep it substantially constant.
  • the braking assembly typically comprises a frustoconical, hollow member which is coaxially supported with its larger end facing the drum, and is biased with its inner surface against the free end of the drum, which has a beveled edge, from which the loops are unwound.
  • the unwinding yarn runs between the drum and the frustoconical member, which applies the desired braking action upon the yarn.
  • a main object of the present invention to provide a braking device of the above type provided with a plurality of linear actuators that modulate the action of the braking assembly, which is improved to be not influenced by any misalignment or mistiming of the actuators, in order to provide very accurate and uniform braking actions.
  • a weft feeder 10 for textile machines comprises a stationary drum 12 on which a swivel arm 14 driven by a motor 16 winds a plurality of yarn loops forming a weft reserve RT.
  • the delivery edge of drum 12 is beveled in 12a.
  • the yarn F is unwound from drum 12 and is fed the loom.
  • a stationary drum 17 projects parallel to the axis of drum 12 and supports a braking assembly 18 at its free end, which controls the tension of the yarn in order to maintain it substantially constant.
  • Braking assembly 18 comprises a frame 20 supported on a slide 22 which is slidable along stationary drum 17 under control of a worm-screw mechanism (not shown) operable by a knob 24.
  • Frame 20 supports a pair of linear actuators 26, 28 which are arranged with their respective driving rods 26a, 28a parallel to the axis of the drum at respective, diametrically opposed positions.
  • An annular support 30 coaxial to the drum is supported at the free ends of the driving rods.
  • a frustoconical hollow member 32 is coaxially supported, with its larger end 32a facing the drum and its inner surface biased against beveled edge 12a, at the center of annular support 30 by elastic means comprising a spider-assembly of springs 34 each having one end anchored to the annular support and the other end anchored to a ring 36 attached to the smaller end 32b of the frustoconical member.
  • the frustoconical member may be made, e.g., of a metal plate or tissue or laminated plastic impregnated with a polymeric resin.
  • the yarn F unwound from drum 12 runs between the beveled edge of the drum and frustoconical member 32, which applies the desired braking action upon the yam.
  • the static contact pressure applied upon the drum by the frustoconical member is adjustable by means of knob 24.
  • each driving rod in order to anchor annular support 30 to driving rods 26a, 28a, each driving rod has a cylindrical metal element 38 attached to the connection end of the rod, which is received with a clearance fit in a respective dead hole or cavity 40 formed on the surface 30a of annular support 30 facing away from the drum.
  • Seats 42 aligned to cavities 40 are formed on the surface 30b facing the drum and are separated from the holes by a thin wall 30c defining the bottom of both blind hole 40 and the seat 42 aligned thereto.
  • Each seat 42 has a magnetic insert 44 received therein, which is in relation of magnetic attraction with a respective one of the metal elements 38 attached to the end of the driving rods.
  • annular support 30 moves integrally with driving rods 26a, 28a, while the clearance fit between metal elements 38 and their respective cavities 40 allows annular support 30 to shift at right angles to the axis of the actuators, thereby compensating any misalignment or mistiming of the actuators without giving rise to stress and reacting forces which, on the contrary, would rise with a rigid connection.
  • Another important advantage of the invention is that, with the above magnet-based anchor system, the frustoconical member can be easily and quickly dismounted, e.g., for replacements due to wear of the braking member.
  • FIG. 5 An alternative embodiment of the invention is described in Fig. 5, wherein the driving rods are directly connected to a mounting ring 136 integral with the smaller end of frustoconical member 32, by means of a magnetic connection similar to the connection described in the first embodiment.
  • metal elements 138 are attached to the connection ends of driving rods 26a, 28a and are received with a clearance fit in respective cavities 140 formed on a surface of ring 136 facing away from the drum.
  • Seats 142 aligned to holes 40 are formed on the surface of ring 136 facing the drum, and are separated from the holes by a thin wall 130c defining the bottom of both cavity 40 and seat 142 aligned thereto.
  • Each seat 142 has a magnetic insert 144 received therein, which is in relation of magnetic attraction with a respective one of metal elements 138 attached to the end of the driving rods.
  • the metal elements may be replaced by other magnetically attractable elements, such as magnetic elements having an opposite polarity with respect to the inserts mounted on annular support 30 - in the first embodiment - or on mounting ring 136 - in the second embodiment - e.g., in order to provide a higher attraction force.
  • the braking assembly could also be provided with a higher number of equally spaced actuators arranged around the axis of the frustoconical member and each connected to the annular support, or to the ring, at the same way as described above.
  • braking member described in the above embodiments is frustoconical and has a continuous surface
  • frustoconical members made of a plurality of blades, rings of radial bristles, and the like, which are known to the person skilled in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (11)

  1. Garnabbremsvorrichtung für Schussgeräte mit einer Garnaufbewahrungstrommel (12), von der das Garn (F) abgewickelt wird, um einer Textilmaschine zugeführt zu werden, wobei die Garnabbremsvorrichtung mindestens ein Paar Linearaktuatoren (26, 28), die mit zugehörigen Antriebsstangen (26a, 28a) parallel zur Achse der Trommel versehen sind, und ein hohles Bremsbauteil (32) mit einem kreisförmigen Profil aufweist, das an den Antriebsstangen (26a, 28a) verankert und axial mit seiner Innenfläche gegen eine Außenfläche der Trommel (12) gespannt ist,
    dadurch gekennzeichnet, dass die Antriebsstangen (26a, 28a) und das hohle Bremsbauteil (32) durch magnetische Kopplungsmittel (38, 40), die in einer Richtung parallel zur Trommelachse wirken, gegenseitig miteinander verbunden sind.
  2. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass das Bremsbauteil aus einem kegelstumpfförmigen hohlen Teil (32) besteht, das mit seinem größeren Ende der Trommel (12) zugewandt ist und mit seiner Innenfläche gegen einen Abgaberand (12a) der Trommel (12) gespannt ist.
  3. Vorrichtung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass die magnetischen Kopplungsmittel pro Aktuator (26, 28) ein magnetisches Teil (44) umfassen, dass in festem Eingriff mit einem der Teile Bremsbauteil (32) oder Antriebsstange (26a, 28a) ist und mittels magnetischer Anziehungskraft mit einem zugehörigen anziehbaren Element (38) in Beziehung steht, dass in festem Eingriff mit dem anderen der Teile Bremsbauteil oder Antriebsstange ist.
  4. Vorrichtung nach Anspruch 3,
    dadurch gekennzeichnet, dass das anziehbare Element (38) an einem Ende der Antriebsstange (26a, 26b) befestigt ist und das magnetische Element (44) in festem Eingriff mit dem hohlen Bremsbauteil (32) ist.
  5. Vorrichtung nach Anspruch 4,
    dadurch gekennzeichnet, dass das hohle Bremsbauteil (32) an einer aus einem nichtmagnetischen Material bestehenden Halterung (30) abgestützt ist, und dass das anziehbare Element (38) mit einer Spielpassung in einem entsprechenden Loch (40) aufgenommen ist, das auf einer ersten Fläche (30a) der Halterung (30) rechtwinklig zur Achse der Bremsbauteils ausgebildet ist.
  6. Vorrichtung nach Anspruch 5,
    dadurch gekennzeichnet, dass das magnetische Element (44) mit einer zweiten Fläche (30b) der Halterung (30) in Eingriff ist, die von der ersten Fläche abgewandt ist.
  7. Vorrichtung nach Anspruch 6,
    dadurch gekennzeichnet, dass das magnetische Element (44) in einem Sitz (42) aufgenommen ist, der auf der zweiten Fläche (30b) der Halterung (30) ausgebildet ist, wobei der Sitz mit dem Loch (40) ausgerichtet ist und von dem Loch durch eine dünne Wand (30c) getrennt ist.
  8. Vorrichtung nach einem der Ansprüche 3 bis 7,
    dadurch gekennzeichnet, dass das anziehbare Element aus einem Metallelement (38) besteht.
  9. Vorrichtung nach einem der Ansprüche 4 bis 7,
    dadurch gekennzeichnet, dass das anziehbare Element (38) aus einem magnetischen Element mit einer entgegengesetzten Polarität bezüglich des magnetischen Elements besteht, das in festem Eingriff mit dem hohlen Bremsbauteil (32) ist.
  10. Vorrichtung nach einem der Ansprüche 5 bis 9,
    dadurch gekennzeichnet, dass die Halterung aus einer ringförmigen Halterung (30) besteht, und dass das hohle Bremsbauteil (32) im Zentrum der ringförmigen Halterung (30) durch elastische Mittel (34) abgestützt ist.
  11. Vorrichtung nach einem der Ansprüche 5 bis 9,
    dadurch gekennzeichnet, dass die Halterung (136) integral mit dem Bremsbauteil (32) ausgeführt ist.
EP20060003897 2005-04-27 2006-02-27 Garnbremssystem in Schussfadenliefervorrichtungen für Textilmaschinen Active EP1717181B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20050279 ITTO20050279A1 (it) 2005-04-27 2005-04-27 Dispositivo di frenatura del filato in alimentatori di trama per macchine tessili

Publications (2)

Publication Number Publication Date
EP1717181A1 EP1717181A1 (de) 2006-11-02
EP1717181B1 true EP1717181B1 (de) 2007-11-07

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EP20060003897 Active EP1717181B1 (de) 2005-04-27 2006-02-27 Garnbremssystem in Schussfadenliefervorrichtungen für Textilmaschinen

Country Status (4)

Country Link
EP (1) EP1717181B1 (de)
CN (1) CN1854366B (de)
DE (1) DE602006000210T2 (de)
IT (1) ITTO20050279A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2610380A1 (de) 2011-12-28 2013-07-03 L.G.L. Electronics S.p.A. Garnzufuhr mit einer stationären Trommel und mit einer gesteuerten Einschlagsbremsvorrichtung

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20111217A1 (it) 2011-12-28 2013-06-29 Lgl Electronics Spa Dispositivo frena-trama per alimentatori di filato a tamburo fisso
ITTO20120875A1 (it) * 2012-10-09 2014-04-10 Lgl Electronics Spa Dispositivo frena-trama per alimentatori di filato a tamburo fisso.
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
DE102018115604A1 (de) * 2018-06-28 2020-01-02 Memminger-Iro Gmbh Fadenliefergerät
CN109436949B (zh) * 2018-12-12 2024-03-19 浙江太阳洲电气科技有限公司 一种张力调节装置和针织输送设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2511324B2 (ja) * 1990-12-28 1996-06-26 株式会社応用技術研究所 磁気掛止具
EP0961393A1 (de) * 1998-05-28 1999-12-01 Sulzer Rüti Ag Linearmotor für eine Textilmaschine sowie Vorrichtung mit einem Linearmotor und Webmaschine mit dieser Vorrichtung
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
ITTO20020023U1 (it) * 2002-02-01 2003-08-01 Lgl Electronics Spa ,,dispositivo di ritegno del supporto portafreno in dispositivi alimentatori di trama,,
ITTO20020029U1 (it) * 2002-02-08 2003-08-08 L G L Electronics Spa ,,dispositivo alimentatore di trama per macchine tessili con sistema di fissaggio del tamburo fisso al corpo motore perfezionato,,

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2610380A1 (de) 2011-12-28 2013-07-03 L.G.L. Electronics S.p.A. Garnzufuhr mit einer stationären Trommel und mit einer gesteuerten Einschlagsbremsvorrichtung

Also Published As

Publication number Publication date
DE602006000210D1 (de) 2007-12-20
ITTO20050279A1 (it) 2006-10-28
EP1717181A1 (de) 2006-11-02
CN1854366B (zh) 2011-03-30
CN1854366A (zh) 2006-11-01
DE602006000210T2 (de) 2008-08-28

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