EP3835469B1 - Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen - Google Patents

Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen Download PDF

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Publication number
EP3835469B1
EP3835469B1 EP20207001.7A EP20207001A EP3835469B1 EP 3835469 B1 EP3835469 B1 EP 3835469B1 EP 20207001 A EP20207001 A EP 20207001A EP 3835469 B1 EP3835469 B1 EP 3835469B1
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EP
European Patent Office
Prior art keywords
wear
braking device
concave body
resistant lamina
weft braking
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Application number
EP20207001.7A
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English (en)
French (fr)
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EP3835469A1 (de
Inventor
Rosario Castelli
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
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LGL Electronics SpA
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Publication of EP3835469A1 publication Critical patent/EP3835469A1/de
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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
    • 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
    • B65H59/02—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package
    • B65H59/04—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package by devices acting on package or support
    • 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 a weft braking device for accumulator yarn feeders.
  • a generic accumulator yarn feeder can comprise a drum that supports, wound thereon, a reserve of yarn which is adapted to be unwound on demand by a generic textile machine downstream. Before entering the textile machine, the yarn being unwound from the drum passes through a weft braking device which controls its mechanical tension.
  • the weft braking device can comprise a thin-walled, axially symmetrical concave body - typically a hollow frustum-shaped body - which is pushed by elastic means against the delivery edge of the drum.
  • the internal surface of the frustum-shaped body, in the annular region where it is in abutment against the drum, can be covered by a wear-resistant lamina which, conventionally, has a frustum-shaped annular profile with the same apex angle as the frustum-shaped body.
  • the yarn being unwound from the feeder slides while being pressed between the delivery edge of the drum and the wear-resistant lamina, in so doing receiving a braking action by friction.
  • the wear-resistant lamina is fixed to the hollow frustum-shaped body by double-sided adhesive tape.
  • US6322016 shows some alternative solutions for fixing the wear-resistant lamina to the frustum-shaped body.
  • the outer edge of the wear-resistant lamina is pinched by tabs with a U-shaped profile which are cut directly into the frustum-shaped body.
  • the wear-resistant lamina can become slightly deformed in the vicinity of the zones pinched by the tabs. Such localized deformations can compromise the uniformity of contact between the wear-resistant lamina and the drum and, as a consequence, the fluidity of the braking action.
  • the rotation of the wear-resistant lamina with respect to the frustum-shaped body is not stopped with any certainty, but is opposed only by the friction between the materials of the two elements. Therefore - especially in oily environments - over time slippages may occur between the wear-resistant lamina and the frustum-shaped body, which can compromise the precision of the braking action.
  • the aim of the present invention is to provide a weft braking device for accumulator yarn feeders, wherein the fixing of the wear-resistant lamina to the concave body is stable even in oily environments, does not interfere with the yarn being unwound, does not influence the uniformity of the braking action, and allows a rapid and straightforward assembly/disassembly of the two elements.
  • a generic accumulator yarn feeder 10 can comprise a drum 12 that supports, wound thereon, a yarn Y that is adapted to be unwound on demand by a generic textile machine M downstream (shown only schematically in Figure 1 ). Before entering the textile machine M, the yarn Y being unwound from the drum 12 passes through a weft braking device 14 which controls its mechanical tension, and a yarn guiding bush 15.
  • the weft braking device 14 comprises an axially symmetrical concave body 16 which is pushed with its internal surface against the delivery edge 12a of the drum 12, for example, by elastic means 18 which are shown only schematically in Figure 1 .
  • the internal surface S of the concave body 16, in the annular region where it is in abutment against the drum 12, is covered by a wear-resistant lamina 20 which has a concave annular profile delimited between an internal annular edge 20a and an external annular edge 20b.
  • the concave body in order to fix the wear-resistant lamina 20 to the concave body 16, the concave body is provided with a series of slits 22 which are arranged along a circumference thereof, while the wear-resistant lamina 20 has a series of fins 24 which project from the external annular edge 20b thereof and are aligned with the slits 22 in order to be inserted into them; the wear-resistant lamina 20 being made of a flexible material having a thickness such that it can be initially applied to the concave body 16 with an opposite concavity with respect thereto (as shown in Figures 3 and 4 ), by inserting the fins 24 into the slits 22, and then turned inside out so as to have a concavity that matches the concave body 16 (as shown in Figures 5 and 6 ).
  • the wear-resistant lamina 20 has a substantially frustum-shaped profile and the internal annular surface S of the concave body 16 covered by the wear-resistant lamina 20 is also substantially frustum-shaped.
  • the wear-resistant lamina 20 has an apex angle ⁇ that is slightly smaller than the apex angle ⁇ of the internal annular surface S.
  • the difference between the apex angle ⁇ of the concave body 16 and the apex angle ⁇ of the wear-resistant lamina 20 is advantageously comprised between 1° and 3°, preferably 2°.
  • the wear-resistant lamina 20 is preferably made of a sheet of metallic material of a thickness comprised between 0.05 and 0.2 mm, more preferably 0.1 mm.
  • a sheet of chromium-plated copper-beryllium can be used.
  • other metallic materials can be suitable for the purpose, e.g., steel, aluminum, and others, all preferably chromium-plated.
  • the concave body 16 is a thin-walled element, preferably made in a single piece, that has an innermost frustum-shaped portion 16a and an outermost frustum-shaped portion 16b which are interconnected by an intermediate cylindrical portion 16c, on which the slits 22 are provided.
  • the slits 22 advantageously have a thin elongated profile.
  • the fins 24 have a substantially rectangular profile with rounded corners, in order to facilitate insertion into the slits 22.
  • the fins 24 extend entirely along the directrices of the frustum-shaped profile of the wear-resistant lamina 20.
  • the weft braking device 14 is assembled by simply inserting the fins 24 of the wear-resistant lamina 20 into the slits 22 of the concave body 16, with the concave side of the wear-resistant lamina 20, at this stage, facing the concave side of the concave body 16 ( Figures 3 and 4 ).
  • the concavity of the wear-resistant lamina 20 is inverted ( Figures 5 and 6 ).
  • the internal annular edge 20a of the wear-resistant lamina 20 comes into contact with the internal surface of the innermost frustum-shaped portion 16a of the concave body 16 ( Figure 6 ).
  • the yarn Y slides while being pressed between the delivery edge 12a of the drum 12 and the wear-resistant lamina 20, in so doing receiving a braking action by friction.
  • the engagement of the fins 24 in the slits 22 definitively prevents the rotation of the wear-resistant lamina 20 with respect to the concave body 16, and provides a stable and enduring fixing even in the presence of oils in the yarn.
  • Another advantage of the system according to the invention is that the fins 24, by protruding outside the hollow body 16, according to the set aims, cannot interfere with the unwinding of the yarn Y from the drum 12.
  • anchoring the wear-resistant lamina 20 to the concave body 16 does not lead to deformations in the wear-resistant lamina 20 and, therefore, does not compromise the uniformity of the braking action in any way.
  • the yarn Y can release processing dust due to the friction against the drum 12 and the wear-resistant lamina 20. Such dust can work its way between the wear-resistant lamina 20 and the concave body 16.
  • the different conicity of the wear-resistant lamina 20 with respect to the concave body 16 makes it possible to prevent the formation of pockets of dust in the lower region of the weft braking device 10, which could compromise the uniformity of the braking action.
  • any dust that is generated during the feeding process is discharged through the annular gap G defined between the external annular edge 20b of the wear-resistant lamina 20 and the internal surface of the concave body 16.
  • Figure 7 shows an alternative embodiment of the invention, which differs from the previous embodiment in that the concave body 116 has a continuous frustum-shaped profile, the slits 122 being provided in a circumference of such frustum-shaped profile, while the fins 124 have a bent profile.
  • the fins 124 have:
  • Figure 8 shows a further embodiment of the invention, in which the concave body 216 has a continuous frustum-shaped profile and the slits 222 are provided on a circumference of such frustum-shaped profile, exactly as in the previous embodiment.
  • the fins 224 extend completely in continuity with the surface of the wear-resistant lamina 220 along the directrices of the frustum-shaped profile of the latter. Therefore, when the wear-resistant lamina 220 is inserted into the concave body 216 and turned inside out, the fins 224 are bent so as to pass through the slit 222 and protrude with their ends from the outer surface of the concave body 216.
  • the number of slits and of fins can be increased or reduced according to requirements.
  • the profile of the concave body and/or of the wear-resistant lamina can differ from those illustrated.
  • these elements could be slightly cambered or hollowed.
  • the concave body is pushed against the delivery edge of the drum by separate elastic means, in other cases the elasticity of the material of the concave body could be used.
  • the material of the wear-resistant lamina can differ from those indicated.
  • a metallic material should be understood to be preferred, the possibility is not ruled out that materials of a different nature, particularly synthetic materials, may be suitable for the purpose.

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

Claims (14)

  1. Eine Schussfadenbremsvorrichtung für eine Speicherfadenzuführvorrichtung, die mit einer Walze (12) ausgestattet ist, auf welche eine Fadenreserve (Y) aufgewickelt ist, die ausgebildet ist, um bei Bedarf von einer stromabwärts angeordneten Textilmaschine (M) abgewickelt zu werden, Folgendes umfassend:
    - einen axialsymmetrischen konkaven Körper (16; 116), ausgebildet, um mit seiner Innenfläche gegen die Abgabekante (12a) der Walze (12) gedrückt zu werden,
    - ein verschleißbeständiges Plättchen (20; 120), das ein konkaves ringförmiges Profil hat, eingegrenzt zwischen einer inneren ringförmigen Kante (20a) und einer äußeren ringförmigen Kante (20b), und eine innere ringförmige Oberfläche (S) des konkaven Körpers (16; 116) in dem Bereich bedeckt, in dem er an die Walze (12) anstößt;
    wobei der konkave Körper (16) mit einer Reihe von Schlitzen (22; 122) versehen ist, die entlang einem Umfang desselben angeordnet sind;
    dadurch gekennzeichnet, dass das verschleißbeständige Plättchen (20; 120) eine Reihe von Vorsprüngen (24; 124) hat, die von der äußeren ringförmigen Kante (20b) desselben vorstehen und mit den Schlitzen (22; 122) ausgerichtet sind, um in sie eingeführt zu werden; wobei das verschleißbeständige Plättchen (20; 120) aus einem biegsamen Material mit einer solchen Dicke besteht, dass es zunächst an dem konkaven Körper (16; 116) mit einer diesem entgegengesetzten Konkavität angebracht werden kann durch Einführen der Vorsprünge (24; 124) in die Schlitze (22; 122), und dann umgestülpt, um eine Konkavität zu haben, die in den konkaven Körper (16; 116) passt.
  2. Die Schussfadenbremsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die innere ringförmige Kante (20a) des verschleißbeständigen Plättchens (20) in seiner umgestülpten Konfiguration in Kontakt mit der Innenfläche des konkaven Körpers (16) steht, während zum Ablassen eventueller Verarbeitungsstäube eine ringförmige Lücke (G) zwischen der äußeren ringförmigen Kante (20b) des verschleißbeständigen Plättchens (20) und der Innenfläche des konkaven Körpers (16) bestimmt ist.
  3. Die Schussfadenbremsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass das konkave Ringprofil des verschleißbeständigen Plättchens (20) im Wesentlichen kegelstumpfförmig ist und die innere ringförmige Oberfläche (S) des konkaven Körpers (16) ebenfalls im Wesentlichen kegelstumpfförmig ist.
  4. Die Schussfadenbremsvorrichtung gemäß Anspruch 3, dadurch gekennzeichnet, dass das verschleißbeständige Plättchen (20) einen Spitzenwinkel (α) hat, der kleiner ist als der Spitzenwinkel (β) der inneren ringförmigen Oberfläche (S).
  5. Die Schussfadenbremsvorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, dass der Unterschied zwischen dem Spitzenwinkel (β) der inneren ringförmigen Oberfläche (S) und dem Spitzenwinkel (α) des verschleißbeständigen Plättchens (20) zwischen 1° und 3° beträgt.
  6. Die Schussfadenbremsvorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, dass der Unterschied zwischen dem Spitzenwinkel (β) der inneren ringförmigen Oberfläche (S) und dem Spitzenwinkel (α) des verschleißbeständigen Plättchens (20) 2° beträgt.
  7. Die Schussfadenbremsvorrichtung gemäß einem der Ansprüche 1-6, dadurch gekennzeichnet, dass das verschleißbeständige Plättchen (20) aus einem Blech aus Metallmaterial mit einer Dicke zwischen 0,05 und 0,2 mm besteht.
  8. Die Schussfadenbremsvorrichtung gemäß Anspruch 7, dadurch gekennzeichnet, dass das Blech aus Metallmaterial eine Dicke von 0,1 mm hat.
  9. Die Schussfadenbremsvorrichtung gemäß Anspruch 7 oder 8, dadurch gekennzeichnet, dass das Metallmaterial verchromtes Kupfer-Beryllium ist.
  10. Die Schussfadenbremsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass der konkave Körper (16) einteilig geformt ist.
  11. Die Schussfadenbremsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass der konkave Körper (116) ein durchgängiges kegelstumpfförmiges Profil hat.
  12. Die Schussfadenbremsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass der konkave Körper (16) einen innersten kegelstumpfförmigen Abschnitt (16a) und einen äußersten kegelstumpfförmigen Abschnitt (16b) hat, die durch einen intermediären zylindrischen Abschnitt (16c) miteinander verbunden sind, in dem die Schlitze (22) geformt sind.
  13. Die Schussfadenbremsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Vorsprünge (24) sich vollständig entlang den Leitkurven des kegelstumpfförmigen Profils des verschleißbeständigen Plättchens (20) erstrecken.
  14. Die Schussfadenbremsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Vorsprünge (124) Folgendes haben:
    - einen innersten Abschnitt (124a), der sich, wenn das verschleißbeständige Plättchen (120) vom konkaven Körper (116) getrennt ist, entlang den Leitkurven des kegelstumpfförmigen Profils des verschleißbeständigen Plättchens (120) erstreckt; wenn das verschleißbeständige Plättchen (120) in den konkaven Körper (116) eingesetzt und umgestülpt wird, biegt er sich aufgrund des Eingriffs mit dem entsprechenden Schlitz (122), und
    - einen äußersten Abschnitt (124b), der kontinuierlich gebogen ist, um an der äußeren Oberfläche des konkaven Körpers (116) anzuliegen, wenn das verschleißbeständige Plättchen (120), das in den konkaven Körper (116) eingesetzt wird, umgestülpt wird.
EP20207001.7A 2019-12-13 2020-11-11 Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen Active EP3835469B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000023889A IT201900023889A1 (it) 2019-12-13 2019-12-13 Dispositivo frena-trama per alimentatori di filato del tipo ad accumulo

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EP3835469A1 EP3835469A1 (de) 2021-06-16
EP3835469B1 true EP3835469B1 (de) 2022-05-11

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EP (1) EP3835469B1 (de)
CN (1) CN112978500A (de)
IT (1) IT201900023889A1 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9700666D0 (sv) 1997-02-24 1997-02-24 Iro Ab Fadenliefergerät und fadenbremse
IT1295624B1 (it) * 1997-10-15 1999-05-24 Roj Electrotex Nuova Srl Dispositivo di frenatura per filati in alimentatori di trama ed elemento frenante per detto dispositivo
ITTO980402A1 (it) * 1998-05-13 1999-11-13 Lgl Electronics Spa Perfezionamenti ai dispositivi di frenatura autoregolante del filato per apparecchi alimentatori di trama
ITMI981313A1 (it) * 1998-06-10 1999-12-10 Roj Electrotex Nuova Srl Freno per filati specialmente per alimentatori di trama
ITTO20010260A1 (it) * 2001-03-20 2002-09-20 Lgl Electronics Spa Dispositivo di frenatura autoregolante per apparecchi alimentatori ditrama.
JP3926240B2 (ja) * 2002-08-21 2007-06-06 多川機械株式会社 緯糸測長貯留装置
EP2623650B1 (de) * 2012-02-02 2015-03-11 Iro Ab Fadenbremse für Vorspulgerät
NL2018606B1 (en) * 2017-03-30 2018-10-10 Vmi Holland Bv Creel bobbin brake, creel bobbin assembly, a creel and a creel method

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Publication number Publication date
EP3835469A1 (de) 2021-06-16
IT201900023889A1 (it) 2021-06-13
CN112978500A (zh) 2021-06-18

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