EP0581745B1 - Verbesserung von Schussfadenliefervorrichtungen für pneumatische Webmaschinen - Google Patents

Verbesserung von Schussfadenliefervorrichtungen für pneumatische Webmaschinen Download PDF

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Publication number
EP0581745B1
EP0581745B1 EP93830309A EP93830309A EP0581745B1 EP 0581745 B1 EP0581745 B1 EP 0581745B1 EP 93830309 A EP93830309 A EP 93830309A EP 93830309 A EP93830309 A EP 93830309A EP 0581745 B1 EP0581745 B1 EP 0581745B1
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EP
European Patent Office
Prior art keywords
moving element
feeder according
weft feeder
pin
magnet
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
EP93830309A
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English (en)
French (fr)
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EP0581745A1 (de
Inventor
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
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP0581745A1 publication Critical patent/EP0581745A1/de
Application granted granted Critical
Publication of EP0581745B1 publication Critical patent/EP0581745B1/de
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

Definitions

  • the present invention relates to an improvement of weft feeders for textile pneumatic looms with high insertion speed.
  • weft feeders are devices suitable to accumulate a reserve of thread in the form of turns wound on a fixed drum and to feed the loom by unwinding the accumulated turns in an amount equal to the length L of thread required by the loom at each beating; said length being equal to the transverse dimension, or width, of the fabric being formed.
  • the pre-feeder also has the task of pre-measuring said length L, and this task is performed by counting the unwound turns of thread by means of a photoelectric cell.
  • L n ⁇ D
  • n the number of unwound turns
  • D the diameter of the drum of the feeder.
  • the photocell provides for the supply of power to the stop element, the intervention of which is completed when the subsequent last turn (n) is reached.
  • EP-A-363 938 discloses a conventional electromagnetic unit for blocking the weft yarn in a loom weft feeder.
  • the intervention time "t" available to the electromagnetic stop element is extremely limited and is generally comprised between 10 and 20 ms (milliseconds).
  • the above equation (1) yields a value of 7 for n.
  • the aim of the present invention is to achieve these important purposes, and for this reason it relates to a weft feeder for pneumatic looms, with an electromagnetic stop element suitable to block the unwinding of the thread from the drum of the feeder after the counting, performed by means of a photoelectric cell, of a preset number of turns, characterized in that said electromagnetic stop element comprises a permanent magnet which cooperates with a fixed magnetic core provided with a circular opening through which a hollow moving element passes, said moving element supporting a winding through which an energization current flows.
  • the moving element which also supports the thread stopping finger at its end, is fitted without contact engagement on a cylindrical extension of the magnet and is supported so that it can move axially with respect to said cylindrical extension.
  • the moving element is elastically supported, so that it can move axially with respect to the cylindrical extension of the core, by a pair of flat springs which also act as elements for retaining and centering said moving element with respect to said cylindrical extension.
  • the moving element which is of a substantially phonic type and is made of a low specific weight material, has a very small inertial mass and is thus capable of responding without appreciable delays to the electrodynamic actuations to which it is subjected. Furthermore, the presence of the plates for centering and retaining said moving element, which eliminate the sliding friction between said moving element and the fixed core, on one hand helps to improve said response of the moving element to electrodynamic actuations and on the other hand avoids wear, achieving the further object of significantly increasing the duration of the electromagnetic stop element.
  • the reference numeral 10 generally designates a weft feeder for pneumatic looms comprising, in a per se known manner, a fixed body 11, a fixed drum 12 and a rotating disk 13, arranged at the base of the drum and actuated by a hollow drive shaft 14.
  • a hollow rotatable arm 15 is rigidly coupled to the disk 13 and is connected to the shaft 14; the thread F runs in the cavities of the shaft and of the arm and is wound by the disk 13 on the drum so as to form a reserve of thread to be fed to the loom.
  • n equal to the length L of the weft inserted by the loom with said beating, are unwound from the drum 12.
  • the number of turns which unwind is counted by a photocell cooperating with a counter (both not shown) which, when the one before last turn (n-1) is reached, causes the energization of an electromagnetic stop device 16.
  • Said stop device engages the thread against the drum with a stopping finger 17, blocking its unwinding when the last turn (n) is reached.
  • the electromagnetic stop device 16 comprises a permanent magnet 18 contained in a cylindrical skirt 19 which constitutes a fixed magnetic core.
  • a moving element 24 is slideably fitted on said axial pin; said moving element is constituted by a hollow cylindrical case 26, made of material having low relative density, for example cardboard or textile material impregnated with resin, or polymeric material, provided with a winding 27.
  • the stopping finger 17 is provided at the free end of the case and is preferably applied and made of ceramic material or the like.
  • the winding 27 is arranged outside the case 26 at the annular gap 23, and is thus crossed by the lines of the magnetic field produced by the permanent magnet 18.
  • the internal diameter of the case 26 is chosen so that it is significantly greater than the outer diameter of the pin 21, so that there is no contact between said case and said pin.
  • the moving element 24, as a whole, is elastically suspended, so that it can move axially with respect to the pin 21, by a pair of annular flat springs 28 and 29 rigidly coupled to the case 26 and to the skirt 19 and also acting as elements for retaining and centering said moving element with respect to said pin 21.
  • the flat springs 28 and 29 are mutually spaced by an extent "d" which is equal to approximately half of the axial extension of the pin 21.
  • said flat springs are made of steel plate with a thickness comprised between 2 and 6 tenths of a millimeter.
  • they may also be made of textile fiber or cardboard, impregnated with polymeric resin, or of woven or felted glass fiber, also impregnated with polymeric resin.
  • the rigid connection between the case 26 and the springs 28 and 29 is preferably obtained by glueing with polymeric adhesive.
  • An energization current I having an intensity comprised for example between 1 and 2 amperes is made to circulate in the winding 27 and is supplied in a known manner by a generator (not shown) under the control of the counter associated with the photoelectric cell which counts the number of turns.
  • This energization current is directed so as to generate, by interaction with the magnetic field produced by the magnet 18, a magnetomotive force suitable to move the moving element 24, in contrast with the elastic action of the flat springs 28 and 29, in the direction of the arrow F of figure 3, so that in the presence of the current I the finger 17 blocks the thread against the drum 12, preventing its unwinding.
  • the permanent magnet 180 is cylindrical and is supported by a cylindrical extension 191 of the skirt 190 at the annular gap 230 in which the moving element 240 passes; said moving element 240 supports the winding 270, and is formed by a cylindrical sleeve 271 preferably made of textile material impregnated with resin and provided with a rigid bottom 272.
  • the cylindrical sleeve 271 is fitted on the magnet 180 without sliding contact and is guided in its axial movement by a pin 273 which is supported by the bottom 272 and which slideably passes in a guiding and retention bush 192 formed on the fixed magnetic core 190.
  • the stopping finger 17 is provided on the end of the pin 273 opposite to the bottom 272.
  • a helical spring 274 is interposed between the bottom 272 and the magnet 180, actuates the moving element 240 into the thread engagement position shown in figure 4 and provides an elastic thread stopping force which acts on the stopping finger 17.
  • an energization current I' is supplied in the winding 270 of the moving element 240 and, by reacting with the magnetic field of the magnet 180, keeps the moving element 240 in the raised position of figure 5, in contrast with the action of the spring 274. Under the control of said turn counter, the current I' is interrupted when the last turn is reached, and the spring 274 pushes the moving element and the finger 17 into the thread stopping position.

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

Claims (17)

  1. Schußfadenliefervorrichtung (10) für pneumatische Webstühle, aufweisend eine feste Trommel (12), eine rotierende Scheibe (13) zum Aufwickeln einer Fadenreserve (F), die dem Webstuhl zugeführt werden soll, auf die Trommel und ein elektromagnetisches Stoppelement (16) zum Blockieren des Abwickelns des Fadens von der Trommel, nachdem mittels einer photoelektrischen Zelle eine vorgegebene Anzahl (n) an Windungen gezählt wurde,
    dadurch gekennzeichnet, daß das elektromagnetische Stoppelement (16) einen Permanentmagneten (18, 180) aufweist, der mit einem ortsfesten Magnetkern (19, 190) zusammenwirkt, welcher mit einer kreisförmigen Öffnung, in der ein hohles, bewegliches Element (24, 240) umläuft, versehen ist, wobei das bewegliche Element eine Wicklung (27, 270) trägt, durch die ein Erregerstrom (I') fließt, und dadurch, daß das bewegliche Element (24, 240) einen Fadenanschlagfinger (17) an seinem Ende trägt und daß es ohne Kontakteingriff auf einem zylindrischen Fortsatz (21) des Magneten (18, 180) angebracht ist, wobei das bewegliche Element (24, 240) so getragen wird, daß es sich axial bezüglich des zylindrischen Fortsatzes bewegen kann.
  2. Schußfadenliefervorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das bewegliche Element (24) des elektromagnetischen Stoppelements (16) auf einem Stift (21) angebracht ist, der einen Fortsatz des Permanentmagneten (18) bildet, und daß es durch ein Paar Flachfedern (28, 29) elastisch aufgehängt ist, so daß es sich frei entlang der Achse des Stifts (21) bewegen kann, wobei die Flachfedern (28, 29) auch als Elemente zum Halten und Zentrieren des beweglichen Elements (24) bezüglich des Stifts (21) wirken.
  3. Schußfadenliefervorrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der ortsfeste Magnetkern von einem zylindrischen Mantel (19) gebildet wird, der Permanentmagnet (18) innerhalb des zylindrischen Mantels und an seiner Rückwand (20) angeordnet ist und der Stift (21) des Magneten (18), der sich axial erstreckt, durch die kreisförmige Öffnung geht, die auf einer Fläche (22) des Mantels (19) gegenüber der Rückwand (20) vorgesehen ist, um einen ringförmigen Spalt (23) zu begrenzen.
  4. Schußfadenliefervorrichtung nach den Ansprüchen 1, 2 und 3, dadurch gekennzeichnet, daß die Weite des ringförmigen Spalts (23) im wesentlichen gleich oder kleiner als der Radius des Stifts (21) des Magneten (18) ist.
  5. Schußfadenliefervorrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß das bewegliche Element (24) durch ein hohles, zylindrisches Gehäuse (26) gebildet wird, welches aus einem Material gemacht ist, das ein geringes spezifisches Gewicht hat, und dadurch, daß der innere Durchmesser des Gehäuses (26) im wesentlichen größer ist als der äußere Durchmesser des Stifts (21) des Magneten (18).
  6. Schußfadenliefervorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das hohle Gehäuse (26) aus Polymermaterial gemacht ist.
  7. Schußfadenliefervorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das hohle Gehäuse (26) aus Pappe gemacht ist.
  8. Schußfadenliefervorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß das hohle Gehäuse (26) mit Polymerharz imprägniert ist.
  9. Schußfadenliefervorrichtung nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß die Wicklung (27) des beweglichen Elements (24) außerhalb des Gehäuses (26) am ringförmigen Spalt (23) angeordnet ist.
  10. Schußfadenliefervorrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Flachfedern (28, 29) ringförmig sind und starr mit dem Mantel des ortsfesten Magnetkerns (19) und mit dem hohlen Gehäuse (26) des beweglichen Elements (24) gekoppelt sind.
  11. Schußfadenliefervorrichtung nach den Ansprüchen 1 und 10, dadurch gekennzeichnet, daß die Flachfedern (28, 29) aus Stahlblech gemacht sind.
  12. Schußfadenliefervorrichtung nach den Ansprüchen 1 und 10, dadurch gekennzeichnet, daß die Flachfedern (28, 29) aus einem nicht-metallischen Material gemacht sind, das aus einer Gruppe ausgewählt ist, die aus Textilfaser, Pappe, Glasfaser besteht.
  13. Schußfadenliefervorrichtung nach Anspruch 12, dadurch gekennzeichnet, daß das nicht-metallische Material mit Polymerharz imprägniert ist.
  14. Schußfadenliefervorrichtung nach den Ansprüchen 1, 10, 11 oder 12, dadurch gekennzeichnet, daß die Flachfedern (28, 29) einen gegenseitigen Abstand haben, der etwa gleich der halben Axialausdehnung des Stifts (21) des Magneten (18) ist.
  15. Schußfadenliefervorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das bewegliche Element (240) eine zylindrische Buchse (271) mit einer Erregerwicklung (270) aufweist, dadurch, daß die Buchse durch einen Boden (272) verschlossen ist, der mit einem Stift (273) versehen ist, welcher mit dem Anschlagfinger (17) endet, wobei der Permanentmagnet (180) durch einen zylindrischen Fortsatz (191) des Magnetkerns (190) getragen wird und sich durch die Öffnung des Magnetkerns (190) erstreckt, um einen ringförmigen Spalt (230) zu bilden, und daß der Permanentmagnet (180) die zylindrische Buchse (271) des beweglichen Elements aufnimmt, welche verschiebbar auf dem Magneten und auf dem zylindrischen Fortsatz angebracht ist, wobei der Boden (272) des beweglichen Elements (240) der Wirkung einer Feder (274) ausgesetzt ist, die das bewegliche Element (240) und den Anschlagfinger (17) in die Position zum Eingreifen in den Faden bewegt und eine Federkraft zum Stoppen des Fadens bereitstellt.
  16. Schußfadenliefervorrichtung nach Anspruch 15, dadurch gekennzeichnet, daß die Erregerwicklung (270) des beweglichen Elements (240) mit einem Erregerstrom (I') versorgt wird, der zusammen mit dem Feld des Permanentmagneten (180) wirkt, um das bewegliche Element (240) entgegengesetzt zur Wirkung der Feder (274) zu bewegen und den Faden von der Stoppwirkung, die durch den Anschlagfinger (17) erzeugt wird, zu entlasten.
  17. Schußfadenliefervorrichtung nach den Ansprüchen 15 und 16, dadurch gekennzeichnet, daß der Stift (273), der starr mit dem Boden (272) des beweglichen Elements gekoppelt ist, in einer Laufbuchse (192), die auf dem ortsfesten Magnetkern (190) ausgeformt ist, gleiten kann und dadurch, daß der Stift (273) und die Laufbuchse (192) zusammenwirken, um das bewegliche Element (240) zu führen, wobei sie zulassen, daß es sich ohne Kontakteingriff bezüglich des Magneten (180) und des zylindrischen Fortsatzes (191) bewegt.
EP93830309A 1992-07-27 1993-07-20 Verbesserung von Schussfadenliefervorrichtungen für pneumatische Webmaschinen Expired - Lifetime EP0581745B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO920643A IT1256898B (it) 1992-07-27 1992-07-27 Perfezionamento agli alimentatori di trama per telai ad aria.
ITTO920643 1992-07-27

Publications (2)

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EP0581745A1 EP0581745A1 (de) 1994-02-02
EP0581745B1 true EP0581745B1 (de) 1996-09-25

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EP93830309A Expired - Lifetime EP0581745B1 (de) 1992-07-27 1993-07-20 Verbesserung von Schussfadenliefervorrichtungen für pneumatische Webmaschinen

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EP (1) EP0581745B1 (de)
DE (1) DE69305028T2 (de)
IT (1) IT1256898B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1271787B (it) * 1994-12-22 1997-06-09 Roj Electrotex Nuova Srl Unita' elettromagnetica di arresto del filo di trama per porgitrama misuratori
IT1303155B1 (it) * 1998-07-17 2000-10-30 Lgl Electronics Spa Perfezionamento ai dispositivi di arresto del filato, negli apparecchiporgitrama premisuratori per telai di tessitura ad aria.
DE10252604A1 (de) * 2002-11-12 2004-05-27 Iropa Ag Liefergerät

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3774785D1 (de) * 1986-07-15 1992-01-09 Sulzer Ag Verfahren fuer den betrieb eines schussfadenspeichers fuer eine webmaschine.
IT1230561B (it) * 1988-10-14 1991-10-28 Roy Electrotex Spa Unita' elettromagnetica di arresto del filo di trama in porgitrama mi-suratori per telai tessili a getto
EP0436197B1 (de) * 1989-12-29 1995-03-29 ROJ ELECTROTEX S.p.A. Schussfadenzubringer für Düsenwebmaschinen

Also Published As

Publication number Publication date
ITTO920643A1 (it) 1994-01-27
IT1256898B (it) 1995-12-27
ITTO920643A0 (it) 1992-07-27
DE69305028D1 (de) 1996-10-31
DE69305028T2 (de) 1997-02-20
EP0581745A1 (de) 1994-02-02

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