EP2853626B1 - Garnzuführung mit Speichertrommel - Google Patents

Garnzuführung mit Speichertrommel Download PDF

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Publication number
EP2853626B1
EP2853626B1 EP14002114.8A EP14002114A EP2853626B1 EP 2853626 B1 EP2853626 B1 EP 2853626B1 EP 14002114 A EP14002114 A EP 14002114A EP 2853626 B1 EP2853626 B1 EP 2853626B1
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EP
European Patent Office
Prior art keywords
braking member
drum
yarn
yarn feeder
hollow
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
EP14002114.8A
Other languages
English (en)
French (fr)
Other versions
EP2853626A1 (de
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
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LGL Electronics SpA
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Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP2853626A1 publication Critical patent/EP2853626A1/de
Application granted granted Critical
Publication of EP2853626B1 publication Critical patent/EP2853626B1/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
    • 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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
    • D04B15/484—Yarn braking means acting on the drum

Definitions

  • So called "storage" yarn feeders which are provided with a drum having a plurality of yarn loops wound thereon, which are adapted to be unwound upon request from a downstream machine, such as a loom or a knitting machine.
  • the yarn is withdrawn from a spool arranged upstream of the feeder, and may be wound on the drum either by a swivel arm, as shown, e.g., in EP 0 534 263 , or by rotating the drum, as shown, e.g., in US 4,068,807 .
  • the yarn coming from the drum is maintained under tension by a weft-braking device.
  • a general weft-braking device comprises a circular braking member which is abutted against the delivery edge of the drum for braking the unwinding yarn by friction, which yarn is pressed between the braking member and the drum while running.
  • the braking member comprises a thin-walled, hollow frustoconical member, which generally consists of a sheet made of a flexible synthetic material such as PVC, PET, PEI, or composite materials such as a tissue impregnated with resins, which is coaxially biased by elastic means against the delivery edge of the drum with its inner surface.
  • the braking member comprises an elastic rubber ring which axially engages the delivery edge of the drum with its inner edge.
  • the elastic ring is supported at the larger base of a rigid, hollow frustoconical member which, in turn, is rotatably supported about its axis by a bearing, so that it follows the drum when it rotates for winding new loops.
  • a yarn feeder according to the preamble of claim 1 is known from DE 19649220 A1
  • a drawback of the known storage drums, such as the above-cited ones, is the any bumps, such as knots or tangles, on the yarn unwinding from the drum may cause high peaks of tension on the yarn as the bump passes between the braking member and the drum, which are pressed against each other. Such peaks of tension may affect the quality of the mesh produced and even cause the yarn to break.
  • a storage yarn feeder 10 comprises a drum 12 having a plurality of loops of yarn Y wound thereon, which are adapted to be unwound upon request from a dowstream machine L, such as a loom or a knitting machine, which is only diagrammatically shown in Fig. 1 .
  • drum 12 can axially rotate, under control of a motor M, for withdrawing yarn from a reel R arranged upstream of the feeder and winding it upon itself.
  • drum 12 may be conventionally provided with sensor means (not shown) for actuating motor M when the amount of yarn stored on drum 12 is about to run out.
  • Yarn Y unwinding from drum 12 is maintained under tension by a weft-braking device 14 which is anchored to an arm 16 projecting from the motor housing.
  • weft-braking device 14 comprises a thin-walled, hollow braking member 18 having a frustoconical profile elastically yielding in the radial direction.
  • braking member 18 consists of a sheet made of a synthetic material, such as PVC, having a thickness in the range 0.1 to 0.5 mm.
  • a different synthetic material such as PET or PEI may be used, or a composite material such as a tissue impregnated with resins.
  • the materials have a modulus of elasticity in the range 1 to 4 Gpa, and a braking member having a moment of inertia in the range 200 to 2000 g ⁇ mm 2 .
  • braking member 18 is biased to coaxially engage a delivery end 12r of drum 12 with its inner surface by elastic means, which are under tension between an annular support 22 connected to arm 16 and a ring 24 which supports braking member 18.
  • annular support 22 is connected to arm 16 by a screw mechanism (not shown) which is incorporated in arm 16 and allows the pressure exerted by braking member 18 on drum 12 to be adjusted by a knob 25 ( Fig. 1 ).
  • the elastic means consist of a spider assembly of helical springs 20 having their inner ends 20a anchored to ring 24 and their outer ends 20b anchored to annular support 22.
  • braking member 18 is rotatably supported about its axis with respect to annular support 22 by a rolling bearing 26 which is operatively arranged between braking member 18 and helical springs 20.
  • a bearing having a low rolling friction and low inertia is used.
  • braking member 18 is housed in a seat 24a of ring 24 and is coaxially connected to rolling bearing 26 via a hollow, trumpet-shaped support 28.
  • Hollow support 28 has a cylindrical end portion 28a on which the inner ring 26a of bearing 26 is fitted.
  • a tube 28b projecting from cylindrical end portion 28a has a diverging profile in the shape of a trumpet.
  • Tube 28b terminates with a frontally open annular groove 30, which is engaged by the smaller-in-diameter end 18a of braking member 18.
  • a cylindrical projection 18c extending from the smaller-in-diameter end 18a of braking member 18 is slidably fitted to an axial, cylindrical surface 30a of annular groove 30.
  • Braking member 18 is axially sandwiched between an annular ridge 32 rising along the inner edge of annular groove 30 and engaging the inner surface of braking member 18, and an O-ring 34, which is received in a respective annular seat 36 surrounding annular groove 30 and engages the outer surface of the braking member.
  • the yarn is unwound from drum 12 upon request from dowstream machine L, and while running it is pressed between drum 12 and braking member 18, thereby receiving a braking action by friction from them which maintains the yarn under a slight tension.
  • drum 12 is periodically rotated at a speed ⁇ 1 ( Fig. 3 ) for winding new yarn upon itself, which yarn is withdrawn from the spool.
  • the yielding of braking member 18, i.e., the capability of rotating axially with respect to drum 12 in response to a tangential thrust generated by any bumps on yarn Y, which is pressed while running between the drum and the braking member, has the effect of dampening the impact of any bumps against the braking member, thereby limiting the rising of eccessive peaks of tension on the yarn.
  • a uniform braking action is guaranteed by the capability of braking member 18 of accurately self-centering with respect to drum 12, when the two parts are put in contact.
  • This self-centering capability is firstly due the fact that braking member 18 is elastically supported on springs; in addition, it is further improved by the system which connects braking member 18 to trumpet-shaped support 28.
  • this locking system is not completely rigid, because braking member 18 is externally abutted against an O-ring 34 which is conventionally made of an elastically yielding material. This provides braking member 18 with a further degree of freedom in its self-centering movements with respect to drum 12.
  • braking members should be excluded which, though having a hollow, frustoconical profile, give a substantially rigid response to the radial deformations in virtue of their thickness and/or of the modulus of elasticity of the material of which they are made.
  • the pressure exerted by the braking member on the drum may be manually adjusted by a screw mechanism.
  • an automatic adjusting system may be provided, which controls the pressure exerted by braking member 18 on drum 12 by a feedback control loop, in order to stabilize the yarn tension on a predetermined value, in a conventional way per se.
  • the elastic means which support the braking member may be configured in a different way with respect to what described and illustrated herein. For instance, elastic ropes may be used, as well as springs ancored with both their ends to the annular support and hooked at an intermediate area to the inner ring.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Claims (4)

  1. Eine Garnzuführung, die Folgendes umfasst:
    - eine Drehtrommel (12) mit einer Vielzahl darauf gewickelter Garnschlaufen (Y), die ausgebildet sind, um bei Anforderung durch eine stromabwärts gelegene Maschine (L) von einem Abgabeende (12r) der Trommel (12) abgewickelt zu werden, und
    - ein dünnwandiges, hohles Bruchglied (18) mit einem im Wesentlichen kegelstumpfförmigen Profil, das elastisch in eine radiale Richtung nachgibt und von elastischen Mitteln (20) unter Spannung zwischen einer stationären Halterung (22) und dem Bruchglied (18) vorgespannt ist, um mit seiner Innenfläche koaxial in Eingriff mit dem Abgabeende (12r) der Trommel (12) zu stehen,
    dadurch gekennzeichnet, dass
    die Trommel (12) eine motorisierte Drehtrommel ist und das Bruchglied (18) durch ein Rollenlager (26), das operativ zwischen dem Bruchglied (18) und den elastischen Mitteln (20) angeordnet ist und eine geringe Rollreibung und geringe Trägheit hat, drehbar um seine eigene Achse mit Bezug auf die stationäre Halterung (22) gelagert ist, und dadurch, dass das Bruchglied (18) aus einem Material besteht, das einen Elastizitätsmodul im Bereich von 1 bis 4 Gpa hat, und ein Trägheitsmoment im Bereich von 200 bis 2000 g·mm2 hat.
  2. Die Garnzuführung gemäß Anspruch 1, dadurch gekennzeichnet, dass das Bruchglied (18) über einen hohlen Träger (28), an welchen das Bruchglied (18) axial über einen Ring (34) aus elastisch nachgebendem Material anstößt, mit einem inneren Ring (26a) des Rollenlagers (26) verbunden ist.
  3. Die Garnzuführung gemäß Anspruch 2, dadurch gekennzeichnet, dass das Bruchglied (18) einen hohlen, zylindrischen Vorsprung (18c) hat, der axial aus seinem Ende (18a) mit kleinerem Durchmesser herausragt und verschiebbar auf einer axialen, zylindrischen Oberfläche (30a) des hohlen Trägers (28) montiert ist, wobei das Bruchglied (18) axial zwischen dem Ring (34) aus elastisch nachgebendem Material und einem ringförmigen Grat geklemmt ist, welcher aus der axialen, zylindrischen Oberfläche (30a) herausragt und in die Innenfläche des Bruchglieds (18) eingreift.
  4. Die Garnzuführung gemäß einem beliebigen der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Bruchglied (18) aus einer Schicht von synthetischem Material besteht, die eine Dicke im Bereich von 0,1 bis 0,5 mm hat.
EP14002114.8A 2013-09-25 2014-06-18 Garnzuführung mit Speichertrommel Active EP2853626B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000769A ITTO20130769A1 (it) 2013-09-25 2013-09-25 Alimentatore di filato con tamburo di accumulo.

Publications (2)

Publication Number Publication Date
EP2853626A1 EP2853626A1 (de) 2015-04-01
EP2853626B1 true EP2853626B1 (de) 2019-10-30

Family

ID=49447734

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14002114.8A Active EP2853626B1 (de) 2013-09-25 2014-06-18 Garnzuführung mit Speichertrommel

Country Status (3)

Country Link
EP (1) EP2853626B1 (de)
CN (1) CN104444589B (de)
IT (1) ITTO20130769A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107043042B (zh) * 2017-03-16 2023-04-11 路佃泉 一种绞纱连续退绕支撑装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH547881A (de) * 1972-10-16 1974-04-11 Zbrojovka Vsetin Np Verfahren und einrichtung zum abmessen der schussfadenlaenge an einer webmaschine.
US4079759A (en) * 1974-08-14 1978-03-21 Zbrojovka Vsetin, Narodni Podnik Apparatus for measuring and adjusting the length of a continuously delivered weft thread
DE2542824C2 (de) * 1975-09-25 1977-11-17 Ab Iro, Ulricehamn (Schweden) Fadenliefervorrichtung
IT1247886B (it) * 1991-05-03 1995-01-05 Candia Ets Fornitore di trama per telai senza navetta
US5316051A (en) 1991-09-20 1994-05-31 L.G.L. Electronics S.P.A. Self-adjusting thread braking device for weft feeder units
IT239803Y1 (it) * 1996-09-03 2001-03-13 Lgl Electronics Spa Dispositivo di ritegno a sgancio rapido del supporto portafreno diapparecchi alimentatori di trama per macchine tessili
DE19649220A1 (de) * 1996-11-27 1998-05-28 Iro Ab Fadenliefergerät mit einer Fadenbremse
ITTO20111218A1 (it) * 2011-12-28 2013-06-29 Lgl Electronics Spa Alimentatore di filato a tamburo fisso con dispositivo frena-trama controllato

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ITTO20130769A1 (it) 2015-03-26
EP2853626A1 (de) 2015-04-01
CN104444589B (zh) 2019-10-22
CN104444589A (zh) 2015-03-25

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