EP3835469A1 - Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen - Google Patents

Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen Download PDF

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Publication number
EP3835469A1
EP3835469A1 EP20207001.7A EP20207001A EP3835469A1 EP 3835469 A1 EP3835469 A1 EP 3835469A1 EP 20207001 A EP20207001 A EP 20207001A EP 3835469 A1 EP3835469 A1 EP 3835469A1
Authority
EP
European Patent Office
Prior art keywords
wear
concave body
braking device
resistant lamina
lamina
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.)
Granted
Application number
EP20207001.7A
Other languages
English (en)
French (fr)
Other versions
EP3835469B1 (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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Filing date
Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP3835469A1 publication Critical patent/EP3835469A1/de
Application granted granted Critical
Publication of EP3835469B1 publication Critical patent/EP3835469B1/de
Active 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
    • D03D47/364—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.

Landscapes

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

Publications (2)

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

Family

ID=70155024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20207001.7A Active EP3835469B1 (de) 2019-12-13 2020-11-11 Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen

Country Status (3)

Country Link
EP (1) EP3835469B1 (de)
CN (1) CN112978500B (de)
IT (1) IT201900023889A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020557A1 (en) * 1997-10-15 1999-04-29 Nuova Roj Electrotex S.R.L. Yarn braking device in yarn feeders for looms and brake element for said device
EP0957058A2 (de) 1998-05-13 1999-11-17 L.G.L. Electronics S.p.A. Selbsteinstellende Fadenbremsvorrichtung für Fadenliefervorrichtungen
US6322016B1 (en) 1997-02-24 2001-11-27 Iro Ab Thread delivery device and thread brake

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1263623B (it) * 1993-02-23 1996-08-27 Roj Electrotex Nuova Srl Alimentatore di filo
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6322016B1 (en) 1997-02-24 2001-11-27 Iro Ab Thread delivery device and thread brake
WO1999020557A1 (en) * 1997-10-15 1999-04-29 Nuova Roj Electrotex S.R.L. Yarn braking device in yarn feeders for looms and brake element for said device
EP0957058A2 (de) 1998-05-13 1999-11-17 L.G.L. Electronics S.p.A. Selbsteinstellende Fadenbremsvorrichtung für Fadenliefervorrichtungen

Also Published As

Publication number Publication date
CN112978500A (zh) 2021-06-18
CN112978500B (zh) 2024-07-02
EP3835469B1 (de) 2022-05-11
IT201900023889A1 (it) 2021-06-13

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