EP0326960B1 - Improved weft feeder for weaving looms - Google Patents

Improved weft feeder for weaving looms Download PDF

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Publication number
EP0326960B1
EP0326960B1 EP89101446A EP89101446A EP0326960B1 EP 0326960 B1 EP0326960 B1 EP 0326960B1 EP 89101446 A EP89101446 A EP 89101446A EP 89101446 A EP89101446 A EP 89101446A EP 0326960 B1 EP0326960 B1 EP 0326960B1
Authority
EP
European Patent Office
Prior art keywords
shaft
bush
rod
weft feeder
swift
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
EP89101446A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0326960A1 (en
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
Original Assignee
LGL Electronics 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
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP0326960A1 publication Critical patent/EP0326960A1/en
Application granted granted Critical
Publication of EP0326960B1 publication Critical patent/EP0326960B1/en
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

Definitions

  • the present invention relates to an improvement in weft feeders for weaving looms.
  • weft feeders for shuttle-less weaving looms currently in use such as gripper looms, bullet looms or fluid-jet looms, have a fixed drum, and the thread to be fed to the loom is wound in a plurality of turns at the base of said drum by an appropriate swivelling arm actuated by a motor shaft which traverses said drum.
  • turns constitute a reserve of thread which must increase according to the speed of the loom and are unwound from the opposite end, or dome, of the drum; the turns which are progressively removed are replaced by the action of an advancement system which moves them from the base to the dome of the drum and keeps them spaced apart by a given pitch.
  • the known advancement system currently universally adopted comprises a swift formed by a set of rods partially and variably protruding from axial slots of the periphery of said drum by virtue of the compound motion imparted to the swift by the motor shaft by means of an offset bush mounted eccentrically on the shaft.
  • This motion is substantially produced by combining a sinusoidal motion and an oscillatory motion in the axial plane and imparts an axial advancement component to the turns of thread; the direction of said component depends on the direction of rotation of the motor shaft.
  • This operation entails the removal of the swift from the motor shaft, the extraction of one type of bush, the mounting of the other type of bush, and the reassembly of the swift.
  • Such a weft feeder resolves the above mentioned problems by providing a rapid enough method of adjustment but it also has important drawbacks.
  • a further disadvantage resides in the fact that the assembly of the moving parts is not rigid, the whole complex being dynamically unbalanced so that vibrations and beats are occurring which, eventually, provoke the breakdown of the whole mechanism.
  • the aim of the present invention is to eliminate these disadvantages by providing an improved weft feeder for weaving looms, by virtue of which it is possible to vary not only the inclination of the bush but also the amplitude of said inclination.
  • an object of the invention is to provide an improved weft feeder for weaving looms which permits variation of the inclination of the bush and the amplitude of such inclination by means of a single gradual actuation entirely performed from the outside without removing any part of the feeder.
  • the motor shaft has a hollow eccentric part on which a ring with a spherical surface is keyed, and portions of a bush connected by axial tie rods abut on one side and on the other side of said ring and are rotoidally coupled with said ring by means of corresponding spherical seats; each bush portion has an axial hole the diameter whereof is greater than the diameter of the eccentric part of the shaft, so that the bush, moved by actuation means accessible from the outside of the shaft, can rotate on an axial plane and in relation to the spherical-surface ring, so as to tilt to one side or the other with respect to the axis of said shaft.
  • the bush portions are advantageously connected to an actuation rod oscillably pivoted to the motor shaft and protruding from diametrical through slots of the shaft and of the spherical-surface ring; said rod is actuated by a threaded tie rod arranged inside the shaft, and a female adjustment thread ending at the free end of said shaft co-operates with said tie rod.
  • the reference numeral 10 indicates the motor or drive shaft of a per se known weft feeder and 20 generally indicates the swift of the system for advancing the turns of thread on the fixed drum 1 of the feeder; the swift 20 comprises a plurality of rods 21 connected to a hub 22 by means of respective spokes 23.
  • the shaft 10 is driven by motor means (not illustrated for clarification purposes) so as to rotate inside the fixed drum 1, and the swift 20 is rotatably mounted on the shaft 10, which has an eccentric and hollow portion 101 dynamically balanced by means of counterweights 102, 103; the hub 22 of the swift is mounted on said part 101 and an inclined bush 30 and a bearing 31 are interposed therebetween.
  • the drum 1 may be fixed through attachment to a stationary member of the loom, and the swift 20 may be maintained rotatively stationary with respect to the drum 1, by being mechanically attached thereto, or by means of magnets associated with the drum and with a stationary part of the loom. Magnets may also be used for maintaining the drum 1 itself stationary.
  • the bush 30 is composed by placing two bush portions 301-302 side by side rigidly butt-joined by axial tie rods 32.
  • the bush portions abut on one side and on the other side of an intermediate ring 40 with a spherical surface, rigidly keyed on the portion 101 of the shaft 10 by means of a pin 401, and rotoidally couple to said ring by means of respective spherical seats 303-304.
  • Each bush portion furthermore has an axial cavity 305, respectively 306, substantially greater in diameter than the eccentric part 101 of the shaft 10, which passes through said cavities; the difference between the diameter of the cavities and that of the eccentric part of the shaft is for example comprised between ten and twenty tenths of a millimeter.
  • the bush is moved by actuation means which not only allow to vary the direction of its inclination but also graduate said inclination and, consequently, the pitch of the turns wound on the feeder drum.
  • Said actuation means comprise a transverse rod 50 oscillably coupled to the part 101 of the shaft 10 by means of a diametrical pin 51.
  • the rod 50 accommodated in a through transverse slot 52 of the part 101, protrudes from one side and the other of the spherical-surface ring 40 which also has corresponding through slots 402.
  • the bush 30 consequently oscillates rigidly together with the rod 50 in the axial plane perpendicular to the pivoting pin 51.
  • a tie rod 60 is articulated, with one of its ends 61, to a point P of the bar, said point being eccentric with respect to the axis of the pivoting pin 51.
  • the tie rod 60 passes through the axial cavity of the shaft 10 and its other appropriately threaded end 62 engages in a female thread 63 which is retained freely rotatable between an end shoulder 102 of the shaft 10 and a retention collar 103 mounted at the end of said shaft and locked by means of a dowel 65.
  • the female thread 63 is advantageously made of polymeric material to compensate the coupling play between the meshing threads, and has a seat 64, for example a hexagonal seat, for the insertion of a corresponding tool which rotates the female thread, consequently moving the tie rod and correspondingly oscillating the rod 50 and the bush 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP89101446A 1988-02-02 1989-01-27 Improved weft feeder for weaving looms Expired - Lifetime EP0326960B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67067/88A IT1219741B (it) 1988-02-02 1988-02-02 Perfezionamento agli alimentatori di trama per telai di tessitura
IT6706788 1988-02-02

Publications (2)

Publication Number Publication Date
EP0326960A1 EP0326960A1 (en) 1989-08-09
EP0326960B1 true EP0326960B1 (en) 1993-09-22

Family

ID=11299318

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89101446A Expired - Lifetime EP0326960B1 (en) 1988-02-02 1989-01-27 Improved weft feeder for weaving looms

Country Status (3)

Country Link
EP (1) EP0326960B1 (it)
DE (1) DE68909263T2 (it)
IT (1) IT1219741B (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105174A1 (de) * 1991-02-20 1992-08-27 Sobrevin Liefervorrichtung fuer laufende faeden
DE9111875U1 (it) * 1991-09-23 1993-01-28 Sobrevin Societe De Brevets Industriels-Etablissement, Vaduz, Li
IT1261256B (it) * 1993-09-10 1996-05-09 Lgl Electronics Spa Dispositivo di separazione delle spire di riserva di filato per apparecchi alimentatori di trama e telai di tessitura e simili

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1066846B (it) * 1976-12-17 1985-03-12 Savio & C Spa Apparecchio per la accumulazione e la alimentazione di filo a macchine utilizzatrici di filo
IT1176259B (it) * 1984-06-04 1987-08-18 Roy Electrotex Spa Alimentatore di trama per telai di tessitura
IT8422055V0 (it) * 1984-06-04 1984-06-04 Roy Electrotex Spa Alimentatore di trama per telai di tessitura comportante mezzi perfezionati per accumulare la riserva di trama.
DE3429219A1 (de) * 1984-08-08 1986-02-20 Sobrevin Société de brevets industriels-Etablissement, Vaduz Fadenspeicher- und liefervorrichtung
IT1204330B (it) * 1986-04-30 1989-03-01 Sarfati & Vischiani Spa Dispositivo accumulatore per alimentatori di filo di trama a macchine tessili

Also Published As

Publication number Publication date
EP0326960A1 (en) 1989-08-09
IT8867067A0 (it) 1988-02-02
IT1219741B (it) 1990-05-24
DE68909263T2 (de) 1994-02-17
DE68909263D1 (de) 1993-10-28

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