WO2023233366A1 - Barre de lance - Google Patents

Barre de lance Download PDF

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Publication number
WO2023233366A1
WO2023233366A1 PCT/IB2023/055679 IB2023055679W WO2023233366A1 WO 2023233366 A1 WO2023233366 A1 WO 2023233366A1 IB 2023055679 W IB2023055679 W IB 2023055679W WO 2023233366 A1 WO2023233366 A1 WO 2023233366A1
Authority
WO
WIPO (PCT)
Prior art keywords
teeth
set according
toothed rack
middle zone
gear wheel
Prior art date
Application number
PCT/IB2023/055679
Other languages
English (en)
Inventor
Matthias CAUWELIER
Frederik DE MEDTS
Brecht Halsberghe
Original Assignee
Vandewiele Nv
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 Vandewiele Nv filed Critical Vandewiele Nv
Publication of WO2023233366A1 publication Critical patent/WO2023233366A1/fr

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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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/271—Rapiers
    • D03D47/273—Rapier rods
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/275—Drive mechanisms

Definitions

  • the present invention relates to a set of a rapier bar for weaving machines, comprising a toothed rack, which is made of fibre-reinforced plastic, with a plurality of teeth, and a gear wheel for these weaving machines, for engaging on this rapier bar.
  • Rapier weaving machines comprise one or more rapiers for inserting weft threads in a shed between warp threads, to form a fabric. These rapiers are mounted on rapier bars and are moved by means of this rapier bar through the shed in the rapier weaving machine.
  • the rapier bars to which this invention relates are provided with a toothed rack for driving this motion.
  • the most important function of the rapier is to position the weft.
  • this weft has to be positioned correctly in the weft direction.
  • the teeth of a gear wheel must be able to engage accurately in the teeth of the toothed rack of the rapier bar.
  • the rapier bar For guiding and carrying the rapier, the rapier bar must be configured to be sufficiently stiff, straight and flat.
  • this weft has to be positioned correctly in the vertical direction and in the warp direction.
  • the rapier bar must also in this case be configured to be sufficiently stiff, straight and flat.
  • the toothed racks are not provided with side walls.
  • the toothed racks are formed from a plate, so that they are given a wavy profile.
  • they are provided with well-considered fibre reinforcement so as to be able to make the whole rapier bar lighter.
  • a toothed rack of this kind is still mounted in a holder profile to ensure the necessary stiffness.
  • the aim of the present invention is to provide another alternative lighter rapier bar.
  • a rapier bar for weaving machines comprising a toothed rack, which is made of fibre-reinforced plastic, with a plurality of teeth; and a gear wheel for these weaving machines, for engaging on the rapier bar; wherein the teeth comprise basic teeth and adapted teeth and wherein said adapted teeth are mounted in a middle zone centrally in the toothed rack, from which, seen relative to said basic teeth of the toothed rack that are mounted in adjacent zones, adjacent to the middle zone, material is omitted at least partially on the tooth flanks, so that the contact ratio, as determined with the finite element method, remains greater than 1.2.
  • the contact ratio is a measure of the overlapping action of the teeth of the toothed rack relative to the teeth of a gear wheel engaging thereon.
  • - xi is the coefficient of profile displacement of the gear wheel; m is the module of the gear wheel; di is the diameter of the pitch circle of the gear wheel; and a is the pressure angle.
  • the contact ratio for plastic teeth can, as is known, be verified using the finite element method.
  • This contact ratio can be determined approximately, as described in T. Jabbour, et al., Real contact ratio and tooth bending stress calculation for plastic/plastic and plastic/steel spur gears, Mechanics & Industry 22, 30 (2021). This approximate calculation was also verified in this article using the finite element method.
  • Toothed racks of known rapier bars are always designed so that the contact ratio is somewhat greater than 1.2.
  • the contact ratio may remain unchanged, or may decrease.
  • this contact ratio is decreased on omission of this material, it is important that the material is only removed to the extent that this contact ratio in the middle zone still remains greater than 1.2. In the adjacent zones the contact ratio is then definitely greater than 1.2.
  • Figs. 2-4 show, in schematic representations in a graph, in each case on a horizontal axis the number of the teeth (T) in a toothed rack, so that this represents the toothed rack seen over the length.
  • Fig. 4 shows, on a vertical axis, the wear (W) of these teeth (T) in mm after a certain time has passed. It is clear that the teeth (T) in a middle zone (C) are less liable to wear than teeth (T) in the adjacent zones (O). It can be seen in Fig.
  • the carrying capacity of the teeth in the middle zone is at least 50.5% of the carrying capacity of the basic teeth in the adjacent zones, preferably at least 51%, even more preferably at least 52% and very preferably at least 55%.
  • both the root stress OF and the Hertzian contact stress GHZ should be taken into account.
  • the root stress OF of the teeth in the middle zone is then preferably at least 50.5% of the root stress OF of the basic teeth in the adjacent zones, more preferably at least 51%, even more preferably at least 52% and very preferably at least 55%.
  • this root stress OF may however be calculated as described in T. Jabbour, et al., Real contact ratio and tooth bending stress calculation for spur gears, Mechanics & Industry 22, 30 (2021), with: where:
  • - Wtr is the transverse load; an is the pressure angle; hr is the bending moment arm;
  • - F is the face width of the teeth of the toothed rack
  • SF is the thickness of the teeth of the toothed rack in the critical section (whose tangent to the tooth neck makes an angle of 30° with the tooth centre line).
  • the Hertzian contact stress GHZ of the teeth in the middle zone is then preferably at least 50.5% of the Hertzian contact stress GHZ of the basic teeth in the adjacent zones, more preferably at least 51%, even more preferably at least 52% and very preferably at least 55%. It is also known, for this Hertzian contact stress GHZ, that with regard to plastic teeth, this cannot be calculated directly with the classical formulae from the standards for toothed gearing.
  • the Hertzian contact stress GHZ can be calculated as described in H.G.H. van Melick, Tooth-Bending Effects in Plastic Spur Gears, Geartechnology September/October 2007, 58-66, with: where: ais is the load distribution factor, which is the percentage of the load that is carried by the tooth for which the Hertzian contact stress is being calculated;
  • E g and E p denote the elastic modulus and u g and Up are the Poisson ratios of the gear wheel and the toothed rack, respectively;
  • the middle zone preferably occupies at most 40% of the total length of the toothed rack. More preferably this middle zone occupies at least 20% of the total length of the toothed rack.
  • the rapier bar is more preferably constructed symmetrically.
  • the omitted material is omitted over the full width of the adapted teeth.
  • the remaining tooth profile then preferably remains equal over the full width of the teeth, but may alternatively also vary, seen in the transverse direction.
  • the omitted material amounts to the complete adapted teeth.
  • said basic teeth are then mounted in the middle zone, alternating with the adapted teeth.
  • Corresponding tooth spaces in a toothed rack of this kind are then fused to a broadened tooth space, extending between remaining basic teeth.
  • material is omitted for alternating tooth flanks for successive adapted teeth.
  • the remaining tooth profile is the same, seen in the transverse direction.
  • the one tooth flank may be omitted on a left side of the adapted tooth, whereas on the right side of the adapted tooth the other tooth flank is omitted.
  • the omitted material seen in the transverse direction occupies a central zone of the adapted teeth.
  • the contact surface between these adapted teeth and teeth of the gear wheel is then decreased.
  • the flank width of these adapted teeth is decreased relative to the flank width of basic teeth.
  • the tooth profile of these adapted teeth then remains unchanged.
  • this tooth profile may also still vary, seen over the width of the adapted teeth, for example by omitting material on the tooth flanks on either side of the central zone. More specifically, for example material may also be omitted on alternating tooth flanks on both sides.
  • a rapier bar of a set according to the present invention may be produced in various known ways, for example such as using the production methods for manufacturing the rapier bars according to the cited prior art.
  • the omitted material may for example be omitted in post-processing, or in production of a toothed rack in a mould, an adaptation of this mould may be provided, or in injection moulding of a toothed rack, injection moulding of this material could be avoided, etc.
  • the rapier bar comprises a holder profile, which demarcates a mounting cavity with a bottom and vertical walls relative to the bottom.
  • the toothed rack is then arranged in the mounting cavity.
  • This toothed rack may for example be manufactured separately by injection moulding and may be glued in the holder profile. Alternatively, it may for example be manufactured as described and illustrated in W02020/148605A1.
  • this holder profile is preferably made of fibre-reinforced plastic.
  • the gear wheel of a set according to the present invention is preferably made of metal.
  • Said gear wheel could alternatively for example also be made manufactured from a suitable plastic.
  • the aim of the present invention is also achieved by providing a weaving machine that comprises a set according to the present invention.
  • Fig. 1 shows a set of a gear wheel and a rapier bar according to the present invention in side view
  • - Fig. 2 shows schematically, in a graph, the acceleration to which a toothed rack from a set according to the invention is subjected in use in a weaving machine, distributed over the length thereof;
  • FIG. 3 shows schematically, in a graph, the speed of a toothed rack from a set according to the invention in use in a weaving machine, distributed over the length thereof;
  • - Fig. 4 shows schematically, in a graph, the wear of a toothed rack from a set according to the invention in use in a weaving machine after a period of time;
  • Fig. 5 shows a toothed rack from a set according to the invention in crosssection
  • FIG. 6 shows a holder profile for a rapier bar from a set according to the invention in cross-section
  • Fig. 7 shows an embodiment of a rapier bar from a set according to the present invention with a toothed rack from Fig. 5 and a holder profile from Fig. 6 in cross-section;
  • Fig. 8 shows half of a toothed rack of a set according to the present invention in cross-section
  • Fig. 9 shows a part of the toothed rack from Fig. 8 in more detail
  • Fig. 10 shows the part of the toothed rack from Fig. 9 in top view
  • FIG. 11 shows a part of an alternative embodiment of a toothed rack of a set according to the present invention in cross-section
  • Fig. 12 shows the part from Fig. 11 in perspective
  • FIG. 13 shows a part of an alternative embodiment of a toothed rack of a set according to the present invention in cross-section
  • Fig. 14 shows the part from Fig. 13 in perspective.
  • the set shown in Fig. 1 comprises a rapier bar (1) and a gear wheel (2) for engaging in this rapier bar (1) in order to drive it in a weaving machine.
  • the rapier bar (1) comprises a holder profile (4) in which a toothed rack (8) is mounted.
  • the holder profile (4) is made of fibre-reinforced plastic. This is possible, for example, by production methods by which holder profiles from said prior art are manufactured.
  • thermoset or a thermoplastic may be selected as plastic, e.g. epoxy, polyester, vinyl ester, polyurethane, etc.
  • reinforcing fibres for example carbon fibres may be selected, and/or aramid fibres and/or glass fibres. These reinforcing fibres are preferably arranged mainly in the longitudinal direction of the holder profile (4), in a fibre fraction between 50% and 80%. Optionally a fraction of reinforcing fibres may also be arranged at an angle relative to the longitudinal direction. This fraction is then preferably between 40% and 55%.
  • a peel-off layer of nylon or polyester fabric may be applied on the surface.
  • a thin polymer layer may also be co-extruded on the holder profile (4).
  • Reinforcing fibres in directions other than the longitudinal direction may thus be arranged in the form of woven or nonwoven cloth on the outer side of the holder profile (4) and/or in the mounting cavity (5) on the inside of the holder profile (4), in order to increase the bending stress of the holder profile (4).
  • This fibre- reinforced cloth may for example be 0.15 mm thick, so that on applying said cloth, on the inside and on the outer side of a basic profile of 0.8 mm thick, together a holder profile (4) of 1.1 mm thick can be formed.
  • the holder profile (4) comprises a bottom (6) and two vertical side walls (7) on either side of the bottom (6), which together demarcate a mounting cavity (5).
  • the toothed rack (8) is fitted in this mounting cavity (5). This may for example be done by gluing.
  • Fig. 8 shows a half toothed rack (8).
  • a half toothed rack (8) made identically, is fitted abutting on the half shown in the mounting cavity (5), with the part of the middle zone (A) shown abutting on each other. In this way, the toothed rack (8) is built up symmetrically and mounted in the holder profile (4).
  • the toothed rack (8) is also made of fibre-reinforced plastic. This may also be for example by production methods with which toothed racks from the cited prior art are manufactured.
  • thermoplastic material is selected, for example such as polyamide 6, polyamide 6.6, polyamide 12, PPA, PPS, PEEK.
  • reinforcing fibres preferably carbon fibres are selected.
  • these reinforcing fibres are applied with arbitrary orientation.
  • these reinforcing fibres are aligned tangentially to the surface, but with arbitrary orientation.
  • the gear wheel (2) is made of metal. More specifically, for example case-hardening steel (16Mcr5) may be selected for said gear wheel for a weaving machine for carpet weaving and for example a fully hardened steel (42CrMo4V) may be selected for said gear wheel for a weaving machine for velvet.
  • 16Mcr5 case-hardening steel
  • 42CrMo4V fully hardened steel
  • Said gear wheel (2) could alternatively for example also be made of a suitable plastic.
  • the toothed rack (8) comprises in each case a middle zone (A), centrally in the toothed rack (8) and adjacent zones (B), which are positioned on either side of the middle zone (A).
  • the middle zone (A) accounts for at least 20% and at most 40% of the total length of the toothed rack (8).
  • the toothed rack (8) also comprises in each case basic teeth (9) and adapted teeth (10, 11, 12, 13).
  • Basic teeth (9) are fitted in the adjacent zones (B).
  • the middle zone (A) comprises adapted teeth (10, 11, 12, 13), which may optionally be interchanged with basic teeth (9).
  • teeth may be omitted, for fastening a rapier (3) on the rapier bar (1).
  • the toothed rack (8) is preferably built up symmetrically.
  • material (14) is omitted at least partially on the tooth flanks (15, 16). This material (14) is omitted in such a way that when the contact ratio is affected, this contact ratio nevertheless always remains greater than 1.2. Moreover, the material (14) is in each case omitted in such a way that the carrying capacity of the teeth (9, 10, 11, 12, 13) in the middle zone (C) is still about 55% of the carrying capacity of the basic teeth
  • a basic tooth (9) is mounted alternately in the middle zone (C) and the material (14) of a following tooth
  • the middle zone (C) may furthermore also comprise one or more basic teeth (9) following each other, which demarcate one and the same tooth space (17), such as the basic teeth (9) in the adjacent zones (O). Because in this embodiment, for the adapted teeth (10), the complete tooth (10) is omitted, the corresponding tooth flanks (15, 16) and therefore also the complete contact surfaces with the gear wheel (2) are also lost. The number of teeth (9) that are in contact with teeth (20) of the gear wheel (2) is decreased in the middle zone (C) relative to the adjacent zones (O). The contact ratio is also decreased as a result.
  • combinations may also be made from the various embodiments shown and/or the tooth profile may also vary over the width of the adapted teeth (10, 11, 12, 13).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention concerne un ensemble constitué d'une barre de lance (1) et d'une roue dentée (2) pour machines à tisser, la barre de lance (1) comprenant une crémaillère dentée (8) en plastique renforcé par des fibres, ayant une pluralité de dents (9, 10, 11, 12, 13), des dents de base (9) et des dents adaptées (10, 11, 12, 13), lesdites dents adaptées (10, 11, 12, 13) étant montées dans une zone centrale (C) de manière centrale dans la crémaillère dentée (8), à partir de laquelle, lorsqu'elle est vue par rapport auxdites dents de base (9) qui sont montées dans des zones adjacentes (O), adjacentes à la zone centrale (C), un matériau (14) est omis au moins partiellement sur les flancs de dent (15, 16), de sorte que le rapport de contact reste supérieur à 1,2.
PCT/IB2023/055679 2022-06-02 2023-06-02 Barre de lance WO2023233366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BEBE-2022/5425 2022-06-02
BE20225425A BE1030580B1 (nl) 2022-06-02 2022-06-02 Grijperstang

Publications (1)

Publication Number Publication Date
WO2023233366A1 true WO2023233366A1 (fr) 2023-12-07

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WO (1) WO2023233366A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1535491A1 (de) 1964-10-03 1969-11-20 Dornier Gmbh Lindauer Schuetzenlose Webmaschine mit Schussfadeneintrag durch Greifersystem
DE1710293B1 (de) 1967-06-08 1970-08-20 Dornier Gmbh Lindauer Greiferstange fuer Webmaschinen mit Entnahme des Schussfadens von ortsfesten Spulen
EP0394639A1 (fr) 1989-04-25 1990-10-31 Lindauer Dornier Gesellschaft M.B.H Barre à pince en rubans de matière synthétique en fibres renforcées
DE19608254A1 (de) 1996-03-04 1997-09-11 Inst Konstruktion Und Verbundb Zahnstange aus Faserverbund
US5669423A (en) * 1995-06-27 1997-09-23 Picanol N.V. Gear for driving a rapier of a loom
DE10120954A1 (de) 2001-04-25 2002-10-31 Inst Konstruktion Und Verbundb Zahnstange zur Bewegung des Greifermechanismus an schützenlosen Webmaschinen sowie Verfahren und Preßwerkzeug zu deren Herstellung
WO2020148605A1 (fr) 2019-01-14 2020-07-23 Vandewiele Nv Tige de lance

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1535491A1 (de) 1964-10-03 1969-11-20 Dornier Gmbh Lindauer Schuetzenlose Webmaschine mit Schussfadeneintrag durch Greifersystem
DE1710293B1 (de) 1967-06-08 1970-08-20 Dornier Gmbh Lindauer Greiferstange fuer Webmaschinen mit Entnahme des Schussfadens von ortsfesten Spulen
EP0394639A1 (fr) 1989-04-25 1990-10-31 Lindauer Dornier Gesellschaft M.B.H Barre à pince en rubans de matière synthétique en fibres renforcées
US5669423A (en) * 1995-06-27 1997-09-23 Picanol N.V. Gear for driving a rapier of a loom
DE19608254A1 (de) 1996-03-04 1997-09-11 Inst Konstruktion Und Verbundb Zahnstange aus Faserverbund
DE10120954A1 (de) 2001-04-25 2002-10-31 Inst Konstruktion Und Verbundb Zahnstange zur Bewegung des Greifermechanismus an schützenlosen Webmaschinen sowie Verfahren und Preßwerkzeug zu deren Herstellung
WO2020148605A1 (fr) 2019-01-14 2020-07-23 Vandewiele Nv Tige de lance

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Publication number Publication date
BE1030580A1 (nl) 2024-01-03
BE1030580B1 (nl) 2024-01-08

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