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EP1028184B1 - Schusseintragsvorrichtung und Eintragsband für Greiferwebmaschinen - Google Patents

Schusseintragsvorrichtung und Eintragsband für Greiferwebmaschinen Download PDF

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Publication number
EP1028184B1
EP1028184B1 EP00101649A EP00101649A EP1028184B1 EP 1028184 B1 EP1028184 B1 EP 1028184B1 EP 00101649 A EP00101649 A EP 00101649A EP 00101649 A EP00101649 A EP 00101649A EP 1028184 B1 EP1028184 B1 EP 1028184B1
Authority
EP
European Patent Office
Prior art keywords
rapier
rapier band
woven fabrics
threads
band
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
EP00101649A
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English (en)
French (fr)
Other versions
EP1028184A1 (de
Inventor
Masahiko Kimbara
Makoto Tsuzuki
Masahiko Yasue
Eiki Niida
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.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
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
Priority claimed from JP03134699A external-priority patent/JP3518388B2/ja
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP1028184A1 publication Critical patent/EP1028184A1/de
Application granted granted Critical
Publication of EP1028184B1 publication Critical patent/EP1028184B1/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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/271—Rapiers
    • D03D47/272—Rapier bands
    • 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
    • D03D47/276—Details or arrangement of sprocket wheels

Definitions

  • the present invention relates to a weft insertion apparatus and a rapier band for a rapier loom.
  • a weft insertion apparatus for a rapier loom includes a rapier band holding a rapier head and a rapier wheel around which the rapier band is wrapped.
  • a wheel that allows such a band to be wrapped therearound is used.
  • the rapier wheel is rotated forward and backward, so that the rapier head held by the rapier band is advanced into and retracted from a warp shedding to allow a weft thread to be inserted into the warp shedding.
  • Japanese Patent Application Laid-open No. 8-296150 discloses a weft insertion apparatus having a mechanism that engages power transmitting teeth formed side by side around the circumference of the rapier wheel with power receiving holes formed side by side in the rapier band.
  • the rapier band must be wrapped partially around the circumference of the rapier wheel.
  • the rapier band must be wrapped around the entire circumference of the rapier wheel.
  • the diameter of the rapier wheel becomes considerably larger than that of the rapier wheel around which the rapier band having power receiving holes is wrapped.
  • a rapier band having power receiving holes is advantageous for increasing the speed of the loom.
  • the rapier band When the rapier band is curved, the rapier band does not expand or contract in the middle as viewed thicknesswise, but expands and contracts at its curved surfaces (i.e., its obverse and reverse sides). That is, the curved surface toward the inside of the curved rapier band contracts, and the curved surface toward the outside of the curved rapier band expands.
  • the bending rigidity With respect to the longitudinal direction of the rapier band having power receiving holes, the bending rigidity differs between the range in which holes are present and the range in which holes are absent. As a result, the rapier band curves exclusively in the range in which holes are present.
  • a rapier band disclosed in Japanese Patent Application Laid-open No. 8-296150 is such that the entire band is made up of laminated woven fabrics.
  • the woven fabrics are effective in preventing the occurrence of the cracks.
  • Both the obverse and reverse sides of the rapier band slidingly contact a band guide that regulates the travelling path of the rapier band
  • exemplary band guides include a fixing guide disclosed in Japanese Patent Application Laid-open No. 9-324342, and spaced teeth disclosed in Japanese Patent Application Laid-open No. 5-209341).
  • Abrasion of the rapier band caused by such sliding contact shortens the life of the band.
  • Japanese Utility Model Application Laid-open No. 62-114079 discloses a rapier band having a polytetrafluoroethylene coating on its surfaces. The polytetrafluoroethylene coating reduces the frictional resistance of the rapier band during sliding contact with the band guide.
  • polytetrafluoroethylene has a shortcoming in that it abrades quickly, and thus is not a suitable material for preventing abrasion of the surfaces of the rapier band.
  • EP 0 939 155 which constitutes prior art under Article 53(3) EPC, describes a highly abrasion-resistant rapier band which has a laminated structure including a core member and a pair of woven fabrics. Either warp threads or weft threads of said woven fabric are arranged to extend along the longitudinal direction of said rapier bands. A total exposed length of the threads extending along the longitudinal direction of said rapier band is larger than that of the threads extending across the width direction of said rapier ban on the obverse side of said woven fabric, and at least one of the threads extending along the longitudinal direction of said rapier ban leaps over at least two threads extending across the width direction of said rapier band.
  • An object of the present invention is, therefore, to provide a highly abrasion-resistant rapier band having a high bending rigidity across the width direction thereof even after abrasion, and a long life in order to overcome the aforementioned problems.
  • a major aspect of the present invention is directed to a rapier loom having a weft insertion apparatus that inserts a weft thread into a warp shedding by first inserting a rapier head held by a rapier band into the warp shedding and then retracting the rapier head from the warp shedding.
  • the present invention provides a weft insertion apparatus in which the rapier band is formed by laminating woven fabrics for preventing abrasion on both obverse and reverse sides of a core member; either warp threads or weft threads of each woven fabric for preventing abrasion are arranged to extend along the longitudinal direction of the rapier band; a total exposed length of the threads extending along the longitudinal direction of the rapier band is larger than that of the threads extending across the width direction of the rapier band on the obverse side of each woven fabric; and at least one of the threads extending along the longitudinal direction of the rapier band leaps over at least two threads extending across the width direction of the rapier band; and a reinforcing compensation layer made of fibers for compensating for bending rigidity across the width direction of the rapier band lies beneath each of said woven fabric for preventing abrasion, the surface of the reinforcing compensation layer being away from the
  • the bending rigidity across the width direction of the rapier band can be compensated for due to fibers across the width direction of rapier band in the reinforcing compensation layer. This allows the life of the rapier band to be extended.
  • the reinforcing compensation layer is a portion of woven fabrics for reinforcing compensation, such that on any of a plurality of predetermined area sections defining one surface of the woven fabric for reinforcing compensation, a total exposed length of the threads extending along the longitudinal direction of the rapier band which is exposed at the predetermined area section is larger than that of the threads extending across the width direction of the rapier band which is exposed at the predetermined area section; and at least one of the threads extending along the longitudinal direction on the predetermined area sections leaps over at least two threads extending across the width direction on this surface, the other surface of the woven fabric for reinforcing compensation is arranged to correspond to the side of the woven fabric for preventing abrasion as the reinforcing compensation layer.
  • a larger number of threads extending across the width direction of the rapier band than the threads extending across the longitudinal direction of the rapier band are exposed on the abode other surface of the woven fabrics for reinforcing compensation.
  • This surface on which a larger number of threads extending across the width direction of the rapier band than the threads extending across the longitudinal direction of the rapier band are exposed becomes the reinforcing compensation layer side.
  • the resulting woven fabrics for reinforcing compensation are suitable to form a reinforcing compensation layer thereon.
  • the woven fabrics for reinforcing compensation are preferably made of satin weave. Satin weave is the optimum woven fabric for reinforcing compensation.
  • the woven fabrics for preventing abrasion are preferably laminated on both the obverse and reverse sides of the core member. This is because the bending rigidity across the longitudinal direction of the rapier band can be preserved by the core member.
  • the reinforcing compensation layer may be interposed between the core member and the woven fabrics for preventing abrasion. This is because the arrangement between the core member and the woven fabrics for preventing abrasion is the optimum position where the reinforcing compensation layer is located.
  • the core member be a three-dimensional fabric because three-dimensional fabrics are suitable for core members.
  • the woven fabrics for preventing abrasion be made of carbon fiber because carbon fiber is a suitable abrasion-resistant material.
  • a rapier band for a rapier loom having a weft insertion apparatus that inserts a weft thread into a warp shedding by first inserting a rapier head held by the rapier band into the warp shedding and then retracting the rapier head from the warp shedding.
  • the rapier band includes a core member, and woven fabrics for preventing abrasion laminated on both obverse and reverse sides of the core member.
  • a rapier band In such a rapier band, either warp threads or weft threads of each woven fabric for preventing abrasion are arranged to extend along the longitudinal direction of the rapier band; a total exposed length of the threads extending along the longitudinal direction of the rapier band is larger than that of the threads extending across the width direction of the rapier band on the obverse side of each woven fabric for preventing abrasion; and at least one of the threads extending along the longitudinal direction of the rapier band leaps over at least two threads extending across the width direction of the rapier band; and a reinforcing compensation layer made of fibers for compensating for the bending rigidity across the width direction of the rapier band lies beneath each of the woven fabrics for preventing abrasion, the surface of the reinforcing compensation layer being away from the center of the thickness of the rapier band, the reinforcing compensation layer having a larger number of fibers in the width direction of the rapier band
  • the rapier band of the above structure has excellent abrasion resistance and high bending rigidity across the width direction thereof after abrasion, and thus its life can be extended.
  • Fig. 1 is a perspective view showing a weft insertion apparatus for a rapier loom according to a first embodiment of the present invention.
  • Reference numeral 11 in Fig. 1 denotes a weft feeding rapier head that is inserted into a warp shedding (not shown) from a weft insertion start end.
  • the weft feeding rapier head 11 is held at an end of a rapier band 12.
  • the rapier band 12 is wrapped around a rapier wheel 13 that rotates forward and backward about a pivot 131.
  • a rapier band 14 is also wrapped around a rapier wheel (not shown) that rotates forward and backward.
  • a weft receiving rapier head 15 is held at the front end of the rapier band 14.
  • the weft feeding rapier head 11 and the receiving rapier head 15 are inserted into the warp shedding, allowing the feeding and receiving rapier heads 11 and 15 to meet each other at the center of the weaving width.
  • the weft thread inserted into the warp shedding by the feeding rapier head 11 is delivered to the receiving rapier head 15.
  • the feeding rapier head 11 and the receiving rapier head 15 are retracted from the warp shedding, allowing the weft thread to be drawn through the warp shedding.
  • Trapezoidal power transmitting teeth 16 are arranged side by side over the circumference of the rapier wheel 13 around which the rapier band 12 is wrapped.
  • rectangular power receiving holes 17 are formed side by side in the rapier band 12.
  • the power transmitting teeth 16 engage with the power receiving holes 17 within the range in which the rapier band 12 is wrapped around the rapier wheel 13.
  • a band guide (not shown) regulates the travelling path of the rapier band 12.
  • Fig. 2 is an enlarged longitudinal sectional view of an essential portion showing the relationship between the rapier wheel and the rapier band.
  • the rapier band 12 is, as disclosed in, e.g., Japanese Patent Application Laid-open No. 2-259248, of a laminated structure including a core member 28, a pair of woven fabrics for preventing abrasion 19 and 20, and a pair of woven fabrics for reinforcing compensation 29 and 30.
  • the core member 28 is a three-dimensional fabric made by a three-dimensional braider.
  • the woven fabrics for reinforcing compensation 29 and 30 are interposed between the woven fabrics for preventing abrasion 19 and 20.
  • the core member 28 is interposed between the woven fabrics for reinforcing compensation 29 and 30.
  • the surfaces of the woven fabrics for preventing abrasion 19 and 20 constitute curved surfaces 121 and 122 of the rapier band 12.
  • the fibers of the core member 28 are such that the component thereof extending in the longitudinal direction of the rapier band 12 is larger than the component extending across the width direction of the rapier band 12.
  • the woven fabrics for reinforcing compensation 29 and 30 are made of the same material as that of the woven fabrics for preventing abrasion 19 and 20. Further, the woven fabrics for reinforcing compensation 29 and 30 have the same textural structure as that of the woven fabrics for preventing abrasion 19 and 20. The structure of the woven fabrics for preventing abrasion 19 and 20 will be described in detail with reference to Figs. 3 (a) and (b).
  • Fig. 3 (a) is an enlarged plan view of an obverse side of the woven fabric for preventing abrasion according to the first embodiment
  • Fig. 3 (b) is an enlarged plan view of a reverse side of the same woven fabric for preventing abrasion.
  • the woven fabrics for preventing abrasion 19 and 20 are of a satin weave consisting of warp threads T and weft threads Y.
  • the weft threads Y are shown by hatching.
  • “Satin weave” means a texture in which four or more warp threads T leap over the weft threads Y or the weft threads Y over the warp threads T and the points of intersection between the warp threads T and the weft threads Y are staggered at regular intervals.
  • the warp threads T of the woven fabrics for preventing abrasion 19 and 20 extend along the longitudinal direction of the rapier band 12, and weft threads Y extend across the width direction of the rapier band 12.
  • Fig. 3 (a) shows the obverse sides of the woven fabrics for preventing abrasion 19 and 20, and
  • Fig. 3 (b) shows reverse sides of the woven fabrics for preventing abrasion 19 and 20.
  • each of the woven fabrics for preventing abrasion 19 and 20 is adhered to the woven fabrics for reinforcing compensation 29 and 30.
  • the obverse side of each of the woven fabrics for preventing abrasion 19 and 20 slidingly contact with the band guide (not shown).
  • the warp threads T are exposed at the obverse side of each of the woven fabrics for preventing abrasion 19 and 20 while leaping over seven continuous weft threads Y.
  • the weft threads Y are exposed at the reverse side of each of the woven fabrics for preventing abrasion 19 and 20 while leaping over seven continuous warp threads Y.
  • the warp threads T and the weft threads Y are the same kind of thread, and have the same diameter. Further, as shown in Figs. 3 (a) and (b), the warp threads T and the weft threads Y have the same pitch P.
  • the woven fabrics for reinforcing compensation 29 and 30 have the same issue structure as that of the woven fabrics for preventing abrasion 19 and 20, that is, the satin weave. More specifically, the pitch of the warp threads T1 of the woven fabrics for reinforcing compensation 29 and 30 and the pitch of the weft threads Y1 of the woven fabrics for reinforcing compensation 29 and 30 is the same, and the diameter of the warp threads T1 thereof and the diameter of the weft threads Y1 thereof is the same.
  • the weft threads Y1 of the woven fabrics for reinforcing compensation 29 and 30 extend along the width direction of the rapier bands 12 and 14, and the warp threads T1 of the woven fabrics for reinforcing compensation 29 and 30 extend along the longitudinal direction of the rapier bands 12 and 14. Further, the warp threads T1 of the woven fabrics for reinforcing compensation 29 and 30 leap over seven continuous weft threads Y1 of the woven fabrics for reinforcing compensation 29 and 30, to thereby be exposed at one surface 291 and 301, respectively, of the woven fabrics for reinforcing compensation 29 and 30.
  • the core member 28 of rapier band 12 can be composed of a plurality of fabrics of plain weave 25, 26 and 27 (three fabrics in the present embodiment).
  • the fiber of the core member 28, warp threads T and weft threads Y is carbon fiber.
  • the core member 28, the woven fabrics for preventing abrasion 19 and 20, and the woven fabrics for reinforcing compensation 29 and 30 contain thermosetting resins such as epoxy resins and bismaleimide resins.
  • the rapier band 14 is also a laminated structure similar to the rapier band 12.
  • the woven fabric for reinforcing compensation 29 interposed between the core member 28 and the woven fabric for preventing abrasion 19 is arranged in opposite relation in textural structure to the woven fabric for preventing abrasion 19. That is, the reverse side of the woven fabric for preventing abrasion 19 is opposed to the other surface 292 of the woven fabric for reinforcing compensation 29 while the reverse side of the woven fabric for preventing abrasion 20 is opposed to the other surface 302 of the woven fabric for reinforcing compensation 30.
  • a thickness t of each of the woven fabrics for reinforcing compensation 29 and 30 includes a layer t1, which is half that thickness, at the side of each of the other surfaces 292 and 302, substantially seven eighths of which is occupied with the weft threads Y1.
  • the layer t1 functions as a reinforcing compensation layer having a larger number of fibers in the width direction of the rapier band 12 than fibers in the longitudinal direction of the rapier band 12.
  • the pair of the woven fabrics for preventing abrasion 19 and 20 includes the reinforcing compensation layer t1 beneath each of the woven fabrics for preventing abrasion 19 and 20, with the surface of the reinforcing compensation layer t1 away from the center S1 of the thickness S of the rapier band 12 (or 14).
  • "beneath the woven fabric for preventing abrasion 19” indicates the core member 28 side as viewed from the position of the woven fabric for preventing abrasion 19
  • the beneath the woven fabric for preventing abrasion 20 indicates the core member 28 side as viewed from the position of the woven fabric for preventing abrasion 20.
  • Embodiment 1 provides the following advantages:
  • a woven fabric for reinforcing compensation 31 according to the second embodiment is arranged with the same relationship of textural structure as the woven fabric for preventing abrasion 19. For this reason, a reinforcing compensation layer t2 corresponding to the reinforcing compensation layer t1 according to the first embodiment is positioned opposite to the core member 28.
  • a woven fabric for reinforcing compensation 32 is also arranged with the same relationship of textural structure as the woven fabric for preventing abrasion 20, and the reinforcing compensation layer t2 is thus positioned opposite to the core member 28.
  • the reinforcing compensation layer t2 according to the second embodiment is farther from the curved surface of the rapier band 12 (or 14) than the reinforcing compensation layer t1 according to the first embodiment.
  • the reinforcing compensation layer t2 has a sufficient compensating effect for the bending rigidity across the width direction of the rapier band 12 (or 14).
  • the present invention may also be embodied in the following modes.

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

Claims (7)

  1. Greiferband für eine Greiferwebmaschine mit einer Einschussvorrichtung, die zuerst durch Einführen eines Greiferkopfes (11), der durch das Greiferband (12) gehalten ist, in ein Webfach und dann durch Zurückfahren des Greiferkopfes (11) von dem Webfach einen Schussfaden in ein Webfach schießt, umfassend:
    ein Kernelement (28); und
    Gewebe zum Verhindern eines Abriebs (19, 20), die sowohl auf die Vorder- als auch die Rückseite des Kernelements (28) laminiert sind; wobei:
    entweder Kettfäden (T) oder Schussfäden (Y) der Gewebe zum Verhindern eines Abriebs (19, 20) derart angeordnet sind, dass sie sich entlang der Längsrichtung des Greiferbandes (12) erstrecken; eine freiliegende Gesamtlänge der Fäden, die sich entlang der Längsrichtung des Greiferbandes (12) erstrecken, größer ist als die der Fäden, die sich quer in der Breitenrichtung des Greiferbandes auf der Vorderseite der Gewebe zum Verhindern eines Abriebs (19, 20) erstrecken; und wenigstens einer der Fäden (T), die sich entlang der Längsrichtung des Greiferbandes erstrecken, wenigstens zwei Fäden (Y), die sich quer in der Breitenrichtung des Greiferbandes auf der Vorderseite erstrecken, überlappt; und
    eine Verstärkungskompensationsschicht (t1), die zur Kompensation und zur Biegesteifigkeit quer, in der Breitenrichtung des Greiferbandes (12) aus Fasern gemacht ist, liegt unterhalb jedes Gewebes zum Verhindern eines Abriebs (19, 20), wobei die Oberfläche der Verstärkungskompensationsschicht (t1) von der Mitte (S1) des Dickenmaßes (S) des Greiferbandes (12) entfernt liegt und die Verstärkungskompensationsschicht (t1) eine größere Anzahl an Fasern (Y1) in der Breitenrichtung des Greiferbandes (12) als Fasern (T1) in der Längsrichtung des Greiferbandes (12) aufweist.
  2. Greiferband nach Anspruch 1, bei dem die Verstärkungskompensationsschicht (t1) die Aufteilung von Geweben zur Verstärkungskompensation (29, 30) ist, so dass auf einem beliebigen aus mehreren vorbestimmten Flächenbereichen, die eine Oberfläche der Gewebe zur Verstärkungskompensation (29, 30) definieren, eine freiliegende Gesamtlänge der Fäden, die sich entlang der Längsrichtung (T1) des Greiferbandes (12) erstrecken, die in dem vorbestimmten Flächenbereich frei liegen, größer ist als die der Fäden, die sich quer in der Breitenrichtung (Y1) des Greiferbandes (12) erstrecken, die in dem vorbestimmten Flächenbereich frei liegen; und bei dem wenigstens einer der Fäden, die sich entlang der Längsrichtung auf dem vorbestimmten Flächenbereich erstrecken, wenigstens zwei Fäden, die sich quer in der Breitenrichtung auf der einen Oberfläche erstrecken, überlappt und die andere Oberfläche der Gewebe zur Verstärkungskompensation (29, 30) derart angeordnet ist, dass sie der Seite der Gewebe zur Verhinderung eines Abriebs (19, 20) als die Verstärkungskompensationsschicht (t1) entspricht.
  3. Greiferband nach Anspruch 2, bei dem die Gewebe zur Verstärkungskompensation (29, 30) aus einem Baumwollsatingewebe gemacht sind.
  4. Greiferband nach einem der Ansprüche 1 bis 3, bei dem die Gewebe zum Verhindern eines Abriebs (19, 20) auf sowohl die Vorder- als auch die Rückseite des Kernelements (28) laminiert sind.
  5. Greiferband nach Anspruch 4, bei dem die Verstärkungskompensationsschicht (t1) zwischen dem Kernelement (28) und den Geweben zum Verhindern eines Abriebs (19, 20) angeordnet ist.
  6. Greiferband nach Anspruch 4 oder 5, bei dem das Kernelement (28) ein dreidimensionales Tuch ist.
  7. Greiferband nach einem der Ansprüche 1 bis 6, bei dem die Gewebe zum Verhindern eines Abriebs (19, 20) aus Karbonfasern gemacht sind.
EP00101649A 1999-02-09 2000-02-01 Schusseintragsvorrichtung und Eintragsband für Greiferwebmaschinen Expired - Lifetime EP1028184B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP03134699A JP3518388B2 (ja) 1998-02-18 1999-02-09 レピア織機における緯入れ装置及びレピアバンド
JP3134699 1999-02-09

Publications (2)

Publication Number Publication Date
EP1028184A1 EP1028184A1 (de) 2000-08-16
EP1028184B1 true EP1028184B1 (de) 2004-06-23

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EP00101649A Expired - Lifetime EP1028184B1 (de) 1999-02-09 2000-02-01 Schusseintragsvorrichtung und Eintragsband für Greiferwebmaschinen

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102912530A (zh) * 2012-10-31 2013-02-06 常熟市常纺纺织机械有限公司 剑杆织机的剑杆与引剑轮的配合结构

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT8521893V0 (it) * 1985-05-22 1985-05-22 Lamiflex Srl Struttura di nastro per telai senza navetta.
FI83791C (fi) * 1989-08-24 1991-08-26 Neste Oy Slitstarkt band och foerfarande foer framstaellning av detta.
IT1236649B (it) * 1989-11-03 1993-03-25 Nuovo Pignone Spa Sistema perfezionato di azionamento a nastro della pinza portatrama per un telaio tessile senza navetta.
TW422899B (en) * 1998-02-18 2001-02-21 Toyoda Automatic Loom Works Weft insertion apparatus on a rapier loom and rapier band

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