EP1101851B1 - Schussfadenaussgleichsbremse - Google Patents

Schussfadenaussgleichsbremse Download PDF

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Publication number
EP1101851B1
EP1101851B1 EP00124236A EP00124236A EP1101851B1 EP 1101851 B1 EP1101851 B1 EP 1101851B1 EP 00124236 A EP00124236 A EP 00124236A EP 00124236 A EP00124236 A EP 00124236A EP 1101851 B1 EP1101851 B1 EP 1101851B1
Authority
EP
European Patent Office
Prior art keywords
fork
arms
rings
thread guiding
brake
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
EP00124236A
Other languages
English (en)
French (fr)
Other versions
EP1101851A1 (de
Inventor
Giovanni Pedrini
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 EP1101851A1 publication Critical patent/EP1101851A1/de
Application granted granted Critical
Publication of EP1101851B1 publication Critical patent/EP1101851B1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
    • B65H59/32—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path the surfaces being urged away from each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to weft brakes for textile machines and more specifically to the so-called compensating weft brakes which are adapted to be inserted between a spool of weft thread and the weft feeder in order to reduce, or more correctly even out, the variations in the mechanical tension of the thread during its unwinding from the spool.
  • conventional compensating brakes are provided with a rigid body which is crossed by the weft thread and to which two mutually opposite arms are articulated so that they can oscillate; the arms are subjected to the action of a contrast spring which has an adjustable tension and tends to divaricate the arms, which are kinematically coupled by toothed sectors which mesh together so as to oscillate simultaneously but with opposite directions of rotation.
  • Each arm is provided with a plurality of ceramic thread guiding rings which are arranged so that the rings of one arm are staggered with respect to the rings of the other arm; the rings are aligned on a single axis only when the arms are arranged mutually adjacent, overcoming the action of the contrast spring.
  • the thread by passing alternately through the thread guiding rings of either arm, traces a zigzag path that the mechanical tension that acts on the thread tends to straighten, applying force to the contrast spring.
  • Such spring by reacting elastically, acts as a damping system and cushions the peaks of mechanical tension that act on the thread.
  • the ceramic annular rings are rigidly coupled to the respective arm of the compensating brake by means of fork-like supports which are open towards the inner side of the arm.
  • the supports are capable of retaining the respective ring, which is induced by the thread to disengage from the support towards the inside of the arm, partly by mechanical action, since they apply an elastic action for undercut radial retention to said ring, and partly by adhesion, since said rings are usually glued to the respective fork-like support.
  • WO-A-91 05728 discloses a compensating weft brake as defined in the preamble of claim 1.
  • CH-A-259 403 discloses a compensating weft brake with fork-like supports with at least one continuous annular wall directed toward an inner side of the arms.
  • the aim of the present invention is essentially to eliminate this severe drawback of known compensating brakes, and within the scope of this general aim the invention has the important object of improving said compensating brakes in order to avoid the unwanted separation of the ceramic rings from the supports of the oscillating arms, without however appreciably varying the known structure of the brake, so as to substantially improve its already satisfactory functionality, significantly increasing its operating reliability.
  • Another important and particular object of the invention is to provide an improvement which can also be applied to existing compensating brakes by virtue of the easy replacement of a limited number of components, so as to allow easy upgrading of said brakes and their functional improvement.
  • the invention is based on the new and original inventive concept of inverting the orientation of the fork-like supports that are adapted to support, on the oscillating arms, the ceramic thread guiding rings, so that the supports have at least one continuous annular support wall which is directed towards the inside of the arms in order to react to the radial stresses discharged by the rings onto the supports, and of arranging any openings of the forks, which allow the insertion of the rings, preferably so that they are directed towards the outer dorsal part of the respective arm that supports the rings.
  • Figures 1 and 2 illustrate a conventional system for feeding the weft thread to a weaving loom (not shown) which comprises a spool of thread 1, a compensating brake 2, and a weft feeder 3, to the rear side of which the brake 2 is rigidly coupled by means of a coupling bracket 4.
  • the brake 2 comprises, in a per se known manner, a body 20 which is crossed by the thread F and is protected by an anti-balloon shield 20', to which two mutually opposite oscillating arms 21-22 are articulated.
  • the arms are kinematically coupled by respective toothed sectors (not shown) which mesh with each other and are subjected to the tension of a contrast spring (not shown in the figure) which tends to divaricate the arms; the tension of the contrast springs is adjustable by means of a knob 23.
  • each arm is provided with a plurality of thread guiding rings 24 made of ceramic material (AL 2 O 3 ) which are arranged so that the rings of one arm are staggered with respect to the rings of the other arm and are mutually aligned on a single axis only when the arms 21-22 are arranged mutually adjacent, overcoming the action of the contrast spring.
  • a 2 O 3 ceramic material
  • the thread F by passing alternately through the thread guiding rings of either arm, traces a zigzag path which the mechanical tension that acts on the thread tends to straighten, applying force to the contrast spring which, by reacting elastically, acts as a damping system for the peaks of the mechanical tension.
  • the thread guiding rings 24 are rigidly coupled to supports 25 of the respective arm; the supports are shaped like an open fork and allow, by elastic deformation, the snap insertion of the respective rings in the support.
  • the compensating brake 2' is provided with fork-like annular supports 25' in which a respective fork opening 26, which allows the insertion of the rings, is directed towards a dorsal outer part Pd of the arms 21-22.
  • the arms have a lattice-like structure which is formed by longitudinal members 21'-22' and cross-members 21 "-22" which form, on the dorsal part of the arms, wide gaps which allow the easy passage of the rings 24 and their insertion in the annular supports through the openings 26.
  • retention pins 27 which have an expanded head and are accommodated in corresponding retention holes provided in the longitudinal members of the structure of the arms 21-22; the retention pins 27 block the respective fork openings 26 in order to retain the rings 24 in place.
  • the embodiment of Figure 4 differs from what has been described above in that the arms 21a-22a of the brake 2' have an open dorsal region, i.e. they do not have the cross-members 21"-22" and have a continuous dorsal opening which accommodates a cover 29 which supports half-cradles 30 for retaining the thread guiding rings 24 in the respective fork-like supports 25'.
  • the respective fork openings 26 for inserting the rings are directed towards the open dorsal region of the respective oscillating arm.
  • the cover 29 is provided with protruding pins 31 which engage by snap action, in order to retain the cover, holes 32 of the longitudinal members 21'-22' of the arms, thanks to the elastic deformability of said longitudinal members, which are typically made of polymeric material, like the cover 29.
  • the fork-like supports 25 of the arms 21-22 of the brake 2' have instead the opening 26 for the insertion of the ring 24 directed towards the inner side of the arms, but the anchoring of the individual rings to the corresponding support is provided by way of removable means which block the fork openings 26.
  • such removable means are advantageously constituted by elastic annular retention elements 40 of the 0-Ring type, which are fitted over the arm and engage a positioning and retaining groove 24a of the ring 24; the annular elements 40 react to the radial forces applied by the thread F to the thread guiding rings 24, discharging them onto the respective oscillating arm 21-22 of the brake.

Landscapes

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

Claims (8)

  1. Schussfaden-Ausgleichsbremse mit einem Bremsenkörper (20), den ein Faden (F) kreuzt und an dem zwei Schwingarme (21 - 22) angelenkt sind, wobei die Arme von einer elastischen Einrichtung kinematisch so gekoppelt und betätigt sind, dass sie sich spreizen, wobei jeder der Arme eine Vielzahl von Fadenführungsringen (24) aus Keramikmaterial aufweist, die eine zickzackförmigen Fadenbahn bilden; wobei jeder Ring starr mit einem jeweiligen Arm der Bremse mittels einer entsprechenden gabelartigen Abstützung mit einer Gabelungsöffnung (26) zum Einführen des Rings gekoppelt ist, dadurch gekennzeichnet, dass die gabelartigen Abstützungen (25') mindestens eine durchgehende ringförmige Stützwandung aufweisen, die zu einer Innenseite der Arme (21 - 22) gerichtet ist, um auf radiale Kräfte zu reagieren, die von den jeweiligen Fadenführungsringen (24) aufgebracht werden, und die Kräfte auf den entsprechenden Arm (21 - 22) der Bremse abgeben, um eine zufällige Trennung des Fadenführungsrings (24) von der jeweiligen gabelartigen Abstützung (25') zu verhindern, während des Weiteren eine Sicherungseinrichtung vorgesehen ist, die ein zufälliges Herausgleiten der Fadenführungsringe (24) aus der jeweiligen gabelartigen Abstützung verhindern, wobei die zusätzliche Sicherungseinrichtung in Verbindung mit der mindestens einen durchgehenden Stützwandung einen geschlossenen Sitz für die Fadenführungsringe (24) bildet.
  2. Schussfadenbremse nach Anspruch 1, dadurch gekennzeichnet, dass die gabelartigen Abstützungen (25') Gabelungsöffnungen (26) aufweisen, die zum Einführen der Fadenführungsringe (24) vorgesehen und zur außen liegenden Rückwandung (PD) der jeweiligen Schwingarme (21 - 22) der Bremse (2') hin gerichtet sind.
  3. Schussfadenbremse nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass die Schwingarme (21 - 22) der Bremse (2') eine gitterartige Struktur aufweisen, welche von Längsteilen (21' - 22') und Querteilen (21" - 22") gebildet wird, die auf der Rückwandung der Arme breite Spalte für den Durchtritt der Fadenführungsringe (24) bilden, damit die Ringe in die jeweiligen gabelartigen Abstützungen (25') eingepasst werden können.
  4. Schussfadenbremse nach Anspruch 3, dadurch gekennzeichnet, dass die weitere Sicherungseinrichtung Sicherungsstifte (27) aufweist, die einen vergrößerten Kopf besitzen, in Sicherungslöchem in der Struktur der Schwingarme (21 - 22) aufgenommen sind und dazu geeignet sind, die Sicherung der Fadenführungsringe (24) in den jeweiligen gabelartigen Abstützungen (25') sicherzustellen, wobei die Sicherungsstifte (27) die jeweiligen Gabelungsöffnungen (26) blockieren.
  5. Schussfadenbremse nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass sie Schwingarme (21a - 22a) aufweist, die einen offenen Rückenbereich aufweisen und von einer Konstruktion gebildet werden, die eine durchgehende Rückenöffnung aufweist, und dass in der durchgehenden Rückenöffnung eine Abdeckung (29) aufgenommen ist, welche die weitere Sicherungseinrichtung bildet und mit Halbjochen (30) zum Halten der Fadenführungsringe (24) in den jeweiligen gabelartigen Abstützungen (25') versehen ist, wobei die Gabelungsöffnung (26) der Abstützungen zur durchgehenden Rückenöffnung des jeweiligen Schwingarms (21a - 22a) hin gerichtet ist.
  6. Schussfadenbremse nach Anspruch 5, dadurch gekennzeichnet, dass die Abdeckung (29) mit vorstehenden Stiften (31) versehen ist, welche unter Rastwirkung in Eingriff kommen, um die Abdeckung zu halten, sowie mit Löchern (32), die in den Längsteilen (21' - 22') der Schwingarme (21a - 22a) vorgesehen sind, wobei der Rasteingriff durch die Elastizität des Polymermaterials ermöglicht ist, aus dem die Schwingarme gefertigt sind.
  7. Schussfadenbremse nach Anspruch 1, dadurch gekennzeichnet, dass die mindestens eine durchgehende ringförmige Wandung und die weitere Sicherungseinrichtung aus einer einzigen abnehmbaren Einrichtung zum Verankern der Fadenführungsringe gebildet sind, welche die Gabelungsöffnung (26) blockiert und auf die radialen Kräfte reagiert, die der Faden auf die Fadenführungsringe (24) aufbringt.
  8. Schussfadenbremse nach Anspruch 7, dadurch gekennzeichnet, dass die einzige abnehmbare Verankerungseinrichtung des Fadenführungsrings (24) aus elastischen Sicherungsringen (40) in Form von O-Ringen besteht, die über den Schwingarm (21 - 22) der Bremse gepasst sind und mit Sicherungs- und Positioniervertiefungen (24a) der Fadenführungsringe (24) in Eingriff stehen.
EP00124236A 1999-11-19 2000-11-10 Schussfadenaussgleichsbremse Expired - Lifetime EP1101851B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO991008 1999-11-19
IT1999TO001008A IT1311453B1 (it) 1999-11-19 1999-11-19 Freno di trama compensatore perfezionato.

Publications (2)

Publication Number Publication Date
EP1101851A1 EP1101851A1 (de) 2001-05-23
EP1101851B1 true EP1101851B1 (de) 2004-08-18

Family

ID=11418230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00124236A Expired - Lifetime EP1101851B1 (de) 1999-11-19 2000-11-10 Schussfadenaussgleichsbremse

Country Status (3)

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EP (1) EP1101851B1 (de)
DE (1) DE60013067T2 (de)
IT (1) IT1311453B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800002973U1 (it) 2018-07-09 2020-01-09 Dispositivo frena-trama comprensatore per applicazioni tessili
IT201800007866A1 (it) * 2018-08-06 2020-02-06 Lgl Electronics Spa Dispositivo frena-trama per alimentatori di filato ad accumulo
CN109267219B (zh) * 2018-11-28 2020-07-24 淳安千岛湖杭瑞织造有限公司 一种纬线处理工艺及其采用改工艺的储纬装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH259403A (de) * 1947-08-13 1949-01-31 Gujer Adolf Fadenbremse.
EP0495920B1 (de) * 1989-10-16 1994-01-19 Iro Ab Fadenbremse

Also Published As

Publication number Publication date
DE60013067T2 (de) 2005-02-10
DE60013067D1 (de) 2004-09-23
IT1311453B1 (it) 2002-03-12
ITTO991008A0 (it) 1999-11-19
EP1101851A1 (de) 2001-05-23
ITTO991008A1 (it) 2001-05-19

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