EP1164103B1 - Moyens de freinage d'un frein de fil autoréglable pour fournisseur de trame - Google Patents

Moyens de freinage d'un frein de fil autoréglable pour fournisseur de trame Download PDF

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Publication number
EP1164103B1
EP1164103B1 EP01111992A EP01111992A EP1164103B1 EP 1164103 B1 EP1164103 B1 EP 1164103B1 EP 01111992 A EP01111992 A EP 01111992A EP 01111992 A EP01111992 A EP 01111992A EP 1164103 B1 EP1164103 B1 EP 1164103B1
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EP
European Patent Office
Prior art keywords
braking means
frustum
drum
braking
shaped body
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
EP01111992A
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German (de)
English (en)
Other versions
EP1164103A2 (fr
EP1164103A3 (fr
Inventor
Pietro Zenoni
Giovanni Pedrini
Ruggero Magoni
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 EP1164103A2 publication Critical patent/EP1164103A2/fr
Publication of EP1164103A3 publication Critical patent/EP1164103A3/fr
Application granted granted Critical
Publication of EP1164103B1 publication Critical patent/EP1164103B1/fr
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 braking means of self-adjusting thread braking devices in weft feeders for textile machines and particularly for weaving looms of the gripper or bullet type.
  • the invention relates to self-adjusting braking devices of the type disclosed in Italian patents no. 1,251,209 and 1,259,567, which are referenced hereinafter as conventional devices.
  • Weft feeders are devices which typically comprise a fixed cylindrical drum, on which an arm rotating in a fishing-reel fashion winds a plurality of turns of thread which constitute a weft reserve, means for producing the advancement of the turns gradually wound from the base towards the end of the drum, and braking means for braking the thread that unwinds from the drum when requested by the loom and for giving it the proper mechanical tension required for the correct unwinding of the thread.
  • the braking means is substantially constituted by a frustum-shaped braking body which is suspended elastically in front of the fixed drum of the feeder, is pushed against the drum typically by the elastic suspension or by equivalent elastic means, and is tangent to the drum at an exit circumference which is slightly smaller than the maximum circumference of the drum.
  • the thread slides between the drum and the frustum-shaped braking body, onto which it discharges the axial component of its tension.
  • the braking body is typically provided with a metallic ring having a protruding edge which is arranged at the smaller or end section of the body and is adapted to engage the thread so as to divert its path.
  • the thread discharges onto the braking body the axial component of its tension also at the end region of the body as well as at the region where it is tangent to the feeder drum, significantly improving the response of the braking device.
  • the frustum-shaped body must have special mechanical characteristics, among which considerable radial elasticity and substantial axial rigidity, combined with low inertia, are particularly important.
  • the frustum-shaped body by using a fabric impregnated with synthetic resins, preferably of the two-part type, or by using a calendered or laminated component made of typically thermosetting polymeric material, providing it with a wear-resistant metallic cladding on the inner side and substantially at a narrow region which straddles the circumference of contact with the drum.
  • the axial strength of the frustum-shaped body in fact degrades accordingly and the body tends to undergo a deformation, flexing below the region where contact with the drum of the feeder occurs and thus losing the ability to transmit to said contact region the elastic force (so-called static tension) with which the elastic suspension means or the like press the braking body against the drum.
  • WO-A-98/38124 discloses a braking means as claimed in the preamble of claim 1.
  • the aim of the present invention starting from the notion of these drawbacks of conventional braking means, is to eliminate them.
  • an object of the invention is to provide a braking means in the form of a frustum-shaped body as specified, which is improved so as to have significantly low mass and inertia for a corresponding rapid response to variations in the mechanical tension of the thread while retaining the ability to transmit fully, in the region where the body makes contact with the drum of the feeder, the elastic pressure applied to said body by the suspension means or the like.
  • a further object of the invention is to provide a braking means, in the form of a frustum-shaped body, which is highly flexible at the region of contact with the drum of the feeder astride the exit circumference of the drum in order to ensure a gradual braking action adapted even for lower-count threads.
  • the invention is based on the concept of providing a braking means having a composite structure which is obtained by superimposing on a first frustum-shaped body, which is substantially flexible both radially and axially, a second frustum-shaped body which is arranged axially only in the region downstream of the feeder drum, over a portion which has a convenient length and gives said portion of the braking body the rigidity that is necessary and sufficient to transmit to the region of tangency between the braking body and the drum the action applied by elastic means that press on said braking body.
  • the reference numeral 10 designates a conventional weft feeder which comprises a fixed drum 11 on which a hollow rotating arm, rigidly coupled to a rotating disk 12 arranged at the base of the drum, winds a weft reserve in the form of a plurality of turns of thread SF.
  • the thread F when requested by the loom or other textile machine (not shown), unwinds from the drum, passing through a thread guide 13 which is coaxial to the drum and is subjected, in its unwinding motion, to the action of a self-adjusting braking device, generally designated by the reference numeral 14, which is designed to keep the thread under tension, automatically modulating the braking action as the advancement speed of the thread varies.
  • the device 14 which is interposed between the thread guide 13 and the drum 11, comprises a braking means 15 which is constituted by a frustum-shaped body made of synthetic laminated material or fabric impregnated with polymeric resins typically of the two-part type, which is arranged so as to face the drum 11, to which it is tangent along an exit circumference CU which is slightly smaller than the maximum one.
  • a braking means 15 which is constituted by a frustum-shaped body made of synthetic laminated material or fabric impregnated with polymeric resins typically of the two-part type, which is arranged so as to face the drum 11, to which it is tangent along an exit circumference CU which is slightly smaller than the maximum one.
  • an annular support 16 and an elastic means 17 the body 15 is pressed against the drum 11 in order to brake with a preset elastic force, known as static tension, the thread that unwinds from the drum, and the support 16 is supported by a carriage 18 which can move axially with respect to the drum 11 by way of a
  • the internal surface of the braking means 15 is provided with a metallic reinforcement lamina (not shown) and at the smaller end section of its frustum-shaped body said braking means is provided with a ring 21 which is adapted to engage the thread F and divert its path towards the thread guide 13;
  • the ring 21 is formed by a conical portion 21a, which is accommodated inside the frustum-shaped body, and by a cylindrical portion 21b, which is external to the body and is screwed like a locking ring onto the portion 21a, clamping the frustum-shaped body of the braking means 15.
  • the improved braking means designated by the reference numeral 15' in Figure 2, maintains the frustum-like shape of the conventional means 15 but is constituted by a composite structure which comprises a first frustum-shaped body 150, which is substantially flexible both radially and axially and protrudes axially from the ring 21 beyond the region of tangency with the drum 11 formed by the exit circumference CU of said drum.
  • a second frustum-shaped body 151 cooperates with the first frustum-shaped body 150, is fitted over the first one and is arranged axially only in the region downstream of the drum 11 of the feeder, over a portion T of suitable length, for example between 50 and 80% of the distance between the ring 21 and the circumference CU of the drum 11, in order to give such portion of the body of the braking means 15' the rigidity that is necessary and sufficient to transmit to the region of tangency between the body and the drum the action applied by the elastic means 17 that press on the braking means.
  • both said first and second frustum-shaped bodies 150 and 151 are made of the same material, typically fabric or calendered material impregnated with epoxy resins, more generally thermosetting resins, or calendered material made of thermoplastic resins, or sheet steel of suitable thickness.
  • a combination of these materials can be used advantageously; for example, by providing the first frustum-shaped body 150 by using impregnated fabric, which is adapted for the purpose due to its greater elasticity, and by providing the second body 151 by using thermoplastic calendered material, or sheet steel, which is more rigid and therefore more adapted to transmit the elastic contact pressure applied by the braking means 15' to the drum 11.
  • the two cooperating frustum-shaped bodies 150-151 can be simply arranged side by side and connected to each other by the clamping action applied by the end ring 21 or can be rigidly coupled to each other beforehand by means of an interposed layer of adhesive.

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

Claims (6)

  1. Moyens de freinage (15') pour des dispositifs de freinage de fil autoréglables (14) de fournisseurs de trame (10) comprenant un tambour (11), dans lesquels, dans une région de tangence avec le tambour (11), la surface interne des moyens de freinage est munie d'une lame de renfort, et dans lesquels les moyens de freinage comprennent également un premier corps tronconique (150) qui est sensiblement souple à la fois radialement et axialement et fait saillie axialement d'un anneau d'extrémité (21) au-delà de ladite région de tangence formée par une circonférence de sortie (CU) du tambour (11),
    caractérisés en ce que les moyens de freinage comprennent un second corps tronconique (151) qui est ajusté sur le premier corps tronconique (150) et est agencé axialement seulement dans la région en aval du tambour (11) du fournisseur, sur une partie (T) ayant une longueur appropriée, et est adapté pour donner à ladite partie (T) du corps des moyens de freinage (15'), une rigidité nécessaire et suffisante pour transmettre à ladite région de tangence l'action appliquée par des moyens élastiques (17) qui pressent le corps desdits moyens de freinage (15') contre le tambour (11).
  2. Moyens de freinage selon la revendication 1,
    caractérisés en ce que aussi bien le premier corps tronconique que le second corps tronconique (150 - 151) sont fabriqués avec la même matière ou avec des matières différentes, choisies parmi le groupe suivant de matières : tissus et matières calandrées imprégnées de résines thermodurcissables, typiquement des résines époxydes, des matières calandrées fabriquées en résines thermoplastiques, tôle d'acier.
  3. Moyens de freinage selon la revendication 1,
    caractérisés en ce que le premier corps tronconique (150) est réalisé en tissu imprégné et le second corps tronconique est réalisé en une matière calandrée thermoplastique.
  4. Moyens de freinage selon les revendications précédentes,
    caractérisés en ce que ladite partie (T) de longueur appropriée est égale à 50-80% de la distance entre l'anneau d'extrémité (21) des moyens de freinage (15') et la circonférence de sortie (CU) du tambour (11) du fournisseur (10).
  5. Moyens de freinage selon les revendications précédentes,
    caractérisés en ce que lesdits premier et second corps tronconiques (150 - 151) sont agencés côte à côte et reliés l'un à l'autre par l'action de serrage appliquée par ledit anneau d'extrémité (21).
  6. Moyens de freinage selon les revendications 1 à 4,
    caractérisés en ce que lesdits corps tronconiques en coopération (150 - 151) sont rigidement assemblés l'un à l'autre par une couche d'adhésif disposée entre eux.
EP01111992A 2000-06-02 2001-05-22 Moyens de freinage d'un frein de fil autoréglable pour fournisseur de trame Expired - Lifetime EP1164103B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000TO000514A IT1320497B1 (it) 2000-06-02 2000-06-02 Perfezionamento al mezzo frenante dei dispositivi di frenaturaautoregolante del filato, per apparecchi alimentatori di trama.
ITTO000514 2000-06-02

Publications (3)

Publication Number Publication Date
EP1164103A2 EP1164103A2 (fr) 2001-12-19
EP1164103A3 EP1164103A3 (fr) 2002-11-06
EP1164103B1 true EP1164103B1 (fr) 2006-04-26

Family

ID=11457774

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01111992A Expired - Lifetime EP1164103B1 (fr) 2000-06-02 2001-05-22 Moyens de freinage d'un frein de fil autoréglable pour fournisseur de trame

Country Status (3)

Country Link
EP (1) EP1164103B1 (fr)
DE (1) DE60119032T2 (fr)
IT (1) IT1320497B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004045725A1 (de) * 2004-09-21 2006-03-23 Aktiebolaget Iro Fadenbremskörper
DE102004051372A1 (de) * 2004-10-21 2006-04-27 Iro Ab Faden-Bremskörper
EP2213776B1 (fr) * 2009-02-03 2014-07-23 Iro Ab Corps de freinage et passe-fil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1256329B (it) * 1992-11-23 1995-11-30 Dispositivo di alimentazione di filo
IT1263623B (it) * 1993-02-23 1996-08-27 Roj Electrotex Nuova Srl Alimentatore di filo
SE9700666D0 (sv) * 1997-02-24 1997-02-24 Iro Ab Fadenliefergerät und fadenbremse
DE29721718U1 (de) * 1997-12-09 1999-04-08 Iro Patent Ag Fadenspeicher

Also Published As

Publication number Publication date
DE60119032T2 (de) 2006-10-26
IT1320497B1 (it) 2003-12-10
DE60119032D1 (de) 2006-06-01
EP1164103A2 (fr) 2001-12-19
ITTO20000514A0 (it) 2000-06-02
ITTO20000514A1 (it) 2001-12-02
EP1164103A3 (fr) 2002-11-06

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