EP0436197B1 - Fournisseur de trame pour métiers à jet de fluide - Google Patents

Fournisseur de trame pour métiers à jet de fluide Download PDF

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Publication number
EP0436197B1
EP0436197B1 EP90125045A EP90125045A EP0436197B1 EP 0436197 B1 EP0436197 B1 EP 0436197B1 EP 90125045 A EP90125045 A EP 90125045A EP 90125045 A EP90125045 A EP 90125045A EP 0436197 B1 EP0436197 B1 EP 0436197B1
Authority
EP
European Patent Office
Prior art keywords
rod
yarn
drum
weft feeder
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.)
Expired - Lifetime
Application number
EP90125045A
Other languages
German (de)
English (en)
Other versions
EP0436197A2 (fr
EP0436197A3 (en
Inventor
Bruno Maina
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.)
Roj Electrotex SpA
Original Assignee
Roj Electrotex 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
Priority claimed from IT22326U external-priority patent/IT218985Z2/it
Priority claimed from IT2056290U external-priority patent/IT219215Z2/it
Application filed by Roj Electrotex SpA filed Critical Roj Electrotex SpA
Publication of EP0436197A2 publication Critical patent/EP0436197A2/fr
Publication of EP0436197A3 publication Critical patent/EP0436197A3/en
Application granted granted Critical
Publication of EP0436197B1 publication Critical patent/EP0436197B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices
    • 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
    • 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

Definitions

  • the present invention concerns improvements in the weft feeders for fluid jet looms known as measuring weft feeders, which are apt to measure the weft yarn lengths to be inserted into the loom shed.
  • a weft feeder of this type comprises an electric motor which causes the rotation of a winding arm, and a drum held stationary around which said arm winds up the yarn into even turns, forming a weft yarn reserve the length of which is controlled by means of suitable sensors.
  • the loom nozzle provided to launch the weft yarn into the warp shed, draws from the weft feeder drum the weft yarn length required for each weft insertion. Said length is measured and controlled by the weft feeder counting the number of unwound turns by suitable means.
  • a device comprising a rod apt to engage the yarn at the outlet of the feeder, said rod being movable between a withdrawn rest position and a projecting working position in which the end of the rod moves into a cavity formed for the purpose on the drum periphery, close to its free end, so as to stop the weft yarn by engaging the same as it unwinds from the drum.
  • the weft yarn stopping device is an electromagnetic device, wherein said rod projects from a movable core, which comprises a head of ferromagnetic material subject to the contrasting actions of at least an electromagnetic coil and of a return spring, allowing to move said rod alternatively into the projecting yarn stopping position and into the withdrawn rest position.
  • a weft feeder is known from the document EP-A-0 111 308.
  • the present invention concerns improvements in said electromagnetic yarn stopping device and in the cavity formed therefor on the drum periphery, so as to obtain an improved performance of the weft feeder.
  • the present invention has faced and solved the above problem by adopting - in a fully original way - a rod made of ceramic material, suitably fixed to the ferromagnetic core of the device.
  • the electromagnetic stopping device in the weft feeder is of the type comprising, mounted inside a housing, at least one electromagnetic coil and a movable core of ferromagnetic material subject to the contrasting actions of said coil and of a return spring, so as to move a yarn stop rod extending axially therefrom in a projecting yarn stopping position and, alternatively, in a withdrawn rest position, and it is characterized in that the movable core is formed of a substantially cylindrical hollow head of ferromagnetic material and of a cylindrical rod of ceramic material, axially positioned into the hollow of the head, and in that the outer surface of the rod and the inner surface of the hollow head are provided with grooves along their directrices, and the remaining hollow part between the head and the rod is filled with plastic material, which is pressure injected in order to block the rod into the head.
  • said grooves of the rod and of the hollow head do not coincide when mounting the two parts of the movable core, and the projecting free end of the rod is round-shaped.
  • the electromagnetic yarn stopping device can be made according to two different principles, namely with the rod, in rest conditions, withdrawn into said device, or with the rod, in rest conditions, projecting from said device and engaging into the cavity provided therefor in the drum.
  • This second arrangement (in which the rod is normally projecting from the device) is preferred especially in the case of adopting an electromagnetic stopping device provided with a single magnet, in that yarn stopping is guaranteed even when the apparatus is not working.
  • the drum around which the yarn reserve is wound is mounted idle on the motor shaft and is prevented from rotating (usually thanks to the magnetic field generated by permanent magnets fixed to the drum and opposing other magnets fixed on the body of the measuring weft feeder).
  • This constructive arrangement hence allows, under the action of suitable external forces, the rotation of the drum about its own axis: said rotation may in fact occur, generally in the form of oscillations, when the weft feeder is being set up - owing to the handling which it undergoes - or else during use thereof, when handling the weft feeder drum in order to vary its extension - and thus the length of the yarn reserve wound thereon - if a drum with variable diameter is adopted.
  • the rod of the electromagnetic stopping device can be hit by the walls of the cavity into which its end is housed, with consequent damages both to the rod and to said walls (whereby the rod is very likely to break, if it is fragile as in the case of the present invention).
  • this trifling but tiresome drawback is overcome by forming the walls of the drum cavity - which are positioned according to the generating lines of the drum - inclined so as to open outwardly wide apart.
  • a measuring weft feeder to feed the weft yarn to fluid jet looms essentially comprises an electric motor 1, which causes the rotation of a winding arm 2, and a drum 3 held stationary, around which said arm 2 winds up the weft yarn 4 into even turns, forming a reserve 5 controlled by sensors 6, the length of said turns being adjustable by changing the radial position of columns 7 which allow to vary the diameter of the drum 3.
  • the yarn 4 being fed to the loom is stopped after a predetermined length thereof has been withdrawn by the loom nozzle; this operation is accomplished by the electromagnetic device 8, when its rod 9 is moved into the projecting position and introduced into the cavity 10 provided therefor on the periphery of the drum 3, close to its free end, to thereby engage and stop the yarn 4.
  • a normal electromagnetic yarn stopping device is shown in fig. 2.
  • Said device 8 comprises a body 11, fixed to the measuring weft feeder and housing an electromagnetic coil 12, a movable core 13 and a spring 14.
  • the device 8 could besides include even more than one coil and its constructive arrangement could be different from that shown.
  • the coil 12 is meant to withdraw the movable core 13 in a rest position, against the action of the spring 14 which is instead meant to keep the rod 9 of said core in the projecting yarn stopping position into the cavity 10 of the drum 3.
  • the spring could alternatively be designed to keep the movable core in the rest position, while the electromagnetic coil could be provided to move said core into the working position with its rod 9 projecting into the drum cavity.
  • FIG. 3 shows in greater detail the movable core 13 of the electromagnetic yarn stopping device 8 according to the invention.
  • Said core 13 consists of a substantially cylindrical hollow head 15 of ferromagnetic material, apt to respond to the action of the electromagnetic coil 12, and of a rod 9 of ceramic material having a high rubbing resistance, which is axially blocked into the head 15 and projects therefrom.
  • the ceramic rod 9 is fixedly connected to the head 15, being blocked therein by injecting a suitable synthetic plastic material 16 into the hollow part between the head and the rod.
  • a suitable synthetic plastic material 16 into the hollow part between the head and the rod.
  • grooves 17, 17A and, respectively, 18, 18A along directrices of said surfaces, so as to create undercuts into which penetrates the injected plastic material, thereby notably improving the grip between the head 15 and the rod 9.
  • the two grooves 17, 17A, formed on the rod portion housed inside the head 15, are arranged so as not to coincide with the grooves 18, 18A of said head, but to be axially offset in respect thereof.
  • the projecting free end of the rod 9 has a round-shaped tip, so as to guarantee its prompt disengagement from the weft yarn 4 when the movable core 13 is withdrawn into the rest position by the coil 12 of the device 8, and the weft yarn 4 has to be fed again to the loom for a new insertion.
  • a rod 9 made of ceramic material - which has never been adopted so far, also due to the difficulty of fixing it into a head of ferromagnetic material, to form the movable core of the device - notably improves the properties of endurance and reliability of the yarn stopping device of the invention adopting said rod, in respect of the conventional yarn stopping devices. Furthermore, the firm and safe fixing of the rod 9 into the head 15 - as obtained according to the invention - prevents any possible damage which could be caused to such a mechanically fragile material, as the ceramic one, by vibrations, oscillations and possible impacts. Said fixing also helps to most efficiently oppose the effects of the high forces of inertia determined by the high speed of the movable core, which would tend to expel the rod from said core.
  • Figures 4 to 6 show the yarn stopping device 8 in a working position, with the rod 9 penetrating into the cavity 10 provided therefor on the drum 3.
  • the cavity 10 - formed as a wide slit perpendicular to the axis of the drum 3, along a directrix of its cylindrical surface - has its head walls 21 and 22, positioned according to the generating lines of said drum, considerably inclined and opening outwardly wide apart.
  • Said walls may suitably consist of simple inclined flat surfaces - as in the embodiment shown in the drawings - but they could also consist of any other similarly inclined surface having one or more curvatures.
  • the walls of the cavity 10 are thus not apt to prevent the rotation of the drum 3, nor is the end of the rod 9 likely to undergo damage, in that there is no actual impact, but rather a gradual sliding contact which protects the integrity both of the rod 9 and of the cavity 10.
  • the configuration of the other parts of the drum 3 allows it to fully rotate about its axis: the adjustable columns 7 are in fact - in their position of maximum extension - contained inside a circle C with centre in A, while the free end of the rod 9, even when it is in a position projecting from the respective device 8, keeps external to the circle C, avoiding all possibility of impact against the adjustable columns 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)

Claims (6)

  1. Fournisseur de trame pour métiers a injection de fluide - du type apte à mesurer les longueurs de fil de trame (4) à insérer dans la foule du métier (fournisseur-mesureur de trame), consistant en un moteur électrique (1) entraînant la rotation d'un bras d'enroulement (2), un tambour (3) maintenu fixe autour duquel ledit bras (2) enroule le fil (4) en spires régulières, formant une réserve de fil de trame (5) dont la longueur est commandée par des capteurs (6) appropriés, et un dispositif d'arrêt de fil électromagnétique (8) comprenant au moins une bobine électromagnétique (12) et un noyau mobile (13) en matériau ferromagnétique soumis aux actions contraires de ladite bobine et d'un ressort de rappel (14), afin de déplacer une tige d'arrêt de fil (9) apte à engager et à arrêter le fil (4) à la sortie du fournisseur de trame, entre une position de repos rétractée et une position d'arrêt de fil en projection dans laquelle l'extrémité de la tige (9) est positionnée dans une cavité (10) formée à cette fin sur la périphérie du tambour, près de son extrémité libre - caractérisé en ce que, le noyau mobile (13) du dispositif d'arrêt de fil (8) est fait d'une tête creuse (15) sensiblement cylindrique de matériau ferromagnétique et d'une tige cylindrique (9) de céramique, positionnée axialement dans le creux de la tête, et en ce que la surface externe de la tige et la surface interne de la tête creuse sont dotées de gorges (17, 17A, 18, 18A) le long de leurs directrices, et la partie creuse restante (16) entre la tête et la tige est remplie de matière plastique, qui est injectée sous pression pour bloquer la tige dans la tête.
  2. Fournisseur de trame selon la revendication 1, dans lequel lesdites gorges (17, 17A, 18, 18A) de la tige et de la tête creuse (15) du dispositif d'arrêt de fil (8) ne coïncident pas lors du montage des deux pièces du noyau mobile (13).
  3. Fournisseur de trame selon la revendication 1, dans lequel l'extrémité libre en projection de ladite tige (9) est arrondie.
  4. Fournisseur de trame selon la revendication 1, dans lequel les parois (21, 22) de la cavité (10) du tambour logeant l'extrémité de la tige (9) du dispositif d'arrêt de fil (8) - qui sont positionnées le long des génératrices du tambour - sont inclinées afin de s'ouvrir très écartées vers l'extérieur.
  5. Fournisseur de trame selon la revendication 4, dans lequel lesdites parois inclinées (21, 22) de la cavité (10) du tambour logeant l'extrémité de la tige (9) du dispositif d'arrêt de fil (8) sont des surfaces plates inclinées.
  6. Fournisseur de trame selon la revendication 4, du type comportant un tambour (3) avec des colonnes (7) se projetant de manière appropriée depuis un corps cylindrique, dans lequel lesdites colonnes (7) - dans leur position de projection maximale - sont contenues dans un cercle (C) ayant pour centre (A) l'axe de rotation du tambour, ladite tige (9) du dispositif d'arrêt de fil (8) demeurant en permanence à l'extérieur dudit cercle (C).
EP90125045A 1989-12-29 1990-12-20 Fournisseur de trame pour métiers à jet de fluide Expired - Lifetime EP0436197B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT2232689U 1989-12-29
IT22326U IT218985Z2 (it) 1989-12-29 1989-12-29 Dispositivo elettromagnetico del filo di trama in porgitrama-misuratori
IT2056290U IT219215Z2 (it) 1990-02-05 1990-02-05 Alimentatore di trama per telai di tessitura a getto di fluido
IT2056290U 1990-02-05

Publications (3)

Publication Number Publication Date
EP0436197A2 EP0436197A2 (fr) 1991-07-10
EP0436197A3 EP0436197A3 (en) 1992-05-13
EP0436197B1 true EP0436197B1 (fr) 1995-03-29

Family

ID=26327578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125045A Expired - Lifetime EP0436197B1 (fr) 1989-12-29 1990-12-20 Fournisseur de trame pour métiers à jet de fluide

Country Status (5)

Country Link
EP (1) EP0436197B1 (fr)
JP (1) JP2828783B2 (fr)
KR (1) KR0139908B1 (fr)
CZ (1) CZ281551B6 (fr)
DE (1) DE69018228T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1942615B (zh) * 2004-04-15 2010-10-20 Iro有限公司 喂纱器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1256898B (it) * 1992-07-27 1995-12-27 Lgl Electronics Spa Perfezionamento agli alimentatori di trama per telai ad aria.
EP0699790B1 (fr) * 1994-07-19 2000-01-19 L.G.L. ELECTRONICS S.p.A. Organe de retenue de fil pour fournisseur de trame de métier à jet d'air
IT1271787B (it) * 1994-12-22 1997-06-09 Roj Electrotex Nuova Srl Unita' elettromagnetica di arresto del filo di trama per porgitrama misuratori
EP2169099A1 (fr) * 2008-09-25 2010-03-31 L.G.L. Electronics S.p.A. Dispositif d'alimentation négative de fils avec un dispositif de freinage de trame
CN106283372B (zh) * 2016-10-20 2019-04-23 厦门绫亚针织机械配件有限公司 一种改良的储纱轮下轮的陶瓷棒、储纱轮下轮及储纱轮
CN114229162A (zh) * 2022-01-12 2022-03-25 深圳市八零联合装备有限公司 一种标签供料装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378821A (en) * 1980-06-27 1983-04-05 Nissan Motor Co., Ltd. Weft detaining device of shuttleless loom
JPS59106543A (ja) * 1982-12-13 1984-06-20 日産自動車株式会社 断片織機の緯糸供給装置
EP0181985B1 (fr) * 1984-11-13 1989-02-01 GebràœDer Sulzer Aktiengesellschaft Dispositif de stockage de fil de trame pour métiers à tisser
IT209674Z2 (it) * 1986-09-11 1988-10-24 Roy Electrotex Spa Struttura di elettromagnete per dispositivi di alimentazione della trama in telai di tessitura.
EP0344100B1 (fr) * 1988-05-20 1992-07-08 GebràœDer Sulzer Aktiengesellschaft Dispositif électromagnétique pour métiers à tisser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1942615B (zh) * 2004-04-15 2010-10-20 Iro有限公司 喂纱器

Also Published As

Publication number Publication date
JP2828783B2 (ja) 1998-11-25
EP0436197A2 (fr) 1991-07-10
DE69018228T2 (de) 1995-08-31
CZ281551B6 (cs) 1996-11-13
EP0436197A3 (en) 1992-05-13
KR910012412A (ko) 1991-08-07
CS694490A3 (en) 1992-03-18
DE69018228D1 (de) 1995-05-04
KR0139908B1 (ko) 1998-07-01
JPH0718543A (ja) 1995-01-20

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