EP0939155A2 - Dispositif d'insertion de la trame et ruban d'insertion pour métiers à tisser à griffes - Google Patents

Dispositif d'insertion de la trame et ruban d'insertion pour métiers à tisser à griffes Download PDF

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Publication number
EP0939155A2
EP0939155A2 EP99100360A EP99100360A EP0939155A2 EP 0939155 A2 EP0939155 A2 EP 0939155A2 EP 99100360 A EP99100360 A EP 99100360A EP 99100360 A EP99100360 A EP 99100360A EP 0939155 A2 EP0939155 A2 EP 0939155A2
Authority
EP
European Patent Office
Prior art keywords
rapier
threads
rapier band
band
weft
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.)
Withdrawn
Application number
EP99100360A
Other languages
German (de)
English (en)
Other versions
EP0939155A3 (fr
Inventor
Makoto Tsuzuki
Masahiko Yasue
Masahiko Kimbara
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
Toyoda Jidoshokki Seisakusho KK
Toyoda Automatic Loom Works Ltd
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 Toyoda Jidoshokki Seisakusho KK, Toyoda Automatic Loom Works Ltd filed Critical Toyoda Jidoshokki Seisakusho KK
Publication of EP0939155A2 publication Critical patent/EP0939155A2/fr
Publication of EP0939155A3 publication Critical patent/EP0939155A3/fr
Withdrawn legal-status Critical Current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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/24—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick by gripper or dummy shuttle

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 around 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 having no power receiving holes is wrapped around 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.
  • the rapier band having power receiving holes is advantageous in 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.
  • 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).
  • 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.
  • An object of the present invention is, therefore, to provide a highly abrasion-resistant rapier band 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 on both obverse and reverse sides of a core member; either warp threads or weft threads of each woven fabric 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.
  • the amount of abrasion in the case where threads are brought into sliding contact in a direction of the threads is smaller than that in the case where the threads are brought into sliding contact in a direction orthogonal to the direction of the threads.
  • abrasion of the threads caused by their sliding contact along the longitudinal direction of the rapier band is smaller than plain weave fabric.
  • the woven fabrics be made of satin weave. This is because the satin weave is the optimum woven fabric for preventing abrasion.
  • the pitch of the warp can also be made substantially the same as that of the weft. This is because such pitch arrangement is effective in preventing break down of the structure of the woven fabrics.
  • the warp can be arranged to extend along the longitudinal direction of the rapier band because such arrangement is effective in improving the bending rigidity along the longitudinal direction of the rapier band.
  • the core member be a three-dimensional fabric because three-dimensional fabrics are suitable for core members.
  • the woven fabrics 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 laminated on both obverse and reverse sides of the core member.
  • rapier band either warp threads or weft threads of each woven fabric 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.
  • the rapier band of the above structure has excellent abrasion resistance 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 inserted into 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
  • Fig. 3 is a sectional view taken along the line A-A of Fig. 2 showing a structure of 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 18, and a pair of woven fabrics 19 and 20.
  • the core member 18 is a three-dimensional fabric made by a three-dimensional braider. Further, the core member 18 is interposed between the woven fabrics 19 and 20.
  • the surfaces of the woven fabrics 19 and 20 constitute curved surfaces 121 and 122 of the rapier band 12.
  • the fibers of the core member 18 are such that the component thereof extending in the longitudinal direction of the rapier band 12 is larger than the component extending in the width direction or thickness direction of the rapier band 12.
  • Fig. 4 is an exploded perspective view showing an essential portion of the structure of the rapier band
  • Fig. 5 (a) is an enlarged plan view of an obverse side of the woven fabric according to the first embodiment
  • Fig. 5 (b) is an enlarged plan view of a reverse side of the same woven fabric.
  • the woven fabrics 19 and 20 are of a satin weave consisting of warp threads T and weft threads Y.
  • the weft threads Y are hatched.
  • “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 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. 5 (a) shows the obverse sides of the woven fabrics 19 and 20, and Fig. 5 (b) shows reverse sides. The reverse side of each of the woven fabrics 19 and 20 is adhered to the core member 18.
  • the warp threads T are exposed at the obverse side of each of the woven fabrics 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 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. 5 (a) and (b), the warp threads T and the weft threads Y have the same pitch P.
  • the fiber of the core member 18, warp threads T and weft threads Y are all made of carbon fiber.
  • the core member 18 and the woven fabrics 19 and 20 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.
  • Embodiment 1 provides the following advantages.
  • Figs. 6 (a) and (b) show a second embodiment in which a woven fabric 23 is adhered to both surfaces of the core member 18.
  • the woven fabric 23 is made of a combination satin weave.
  • Fig. 6 (a) shows the obverse side of the woven fabric 23, and
  • Fig. 6 (b) shows the reverse side.
  • a warp thread T leaps over six weft threads Y on the obverse side of the woven fabric 23 and over two weft threads Y on the reverse side.
  • a weft thread Y leaps over four and then two warp threads T on the reverse side of the woven fabric 23.
  • a rectangle W shown by a chain line in Fig. 6 (a) six warp threads T and two weft threads Y are exposed.
  • a rectangle H with an area that is the same as that of the rectangle W a single warp thread T and two weft threads Y are exposed.
  • the total length of the warp threads T exposed within the rectangle W is about three times that of the weft threads Y exposed in the rectangle W on the obverse side of the woven fabric 23.
  • the total length of the warp threads T exposed within the rectangle H is about three times that of the weft threads Y exposed in the rectangle W on the obverse side of the woven fabric 23.
  • the total length of the warp threads T exposed in a predetermined area portion defined as a rectangle whose area is a multiple integral of the area of the rectangle W or H is about three times that of the weft threads Y exposed in the same predetermined area portion.
  • abrasion resistance is impaired compared with that of the first embodiment.
  • further increasing the degree of intermingle between the warp threads and the weft threads stabilizes the texture of the fabric and prevents a break down of the structure during the resin impregnating step.
  • Figs. 7 (a) and (b) show a third embodiment in which a woven fabric 24 is adhered to both surfaces of the core member 18.
  • the woven fabric 24 is a fabric of a twill weave.
  • Fig. 7 (a) shows an obverse side of the woven fabric 24, and
  • Fig. 7 (b) shows the reverse side.
  • a warp thread T leaps over two weft threads Y on the obverse side of the woven fabric 24.
  • a rectangle W shown by a chain line in Fig. 7 (a) two warp threads T and a single weft thread Y are exposed.
  • a rectangle H with an area that is the same as that of the rectangle W a single warp thread T and a single weft thread Y are exposed.
  • the total length of the warp T exposed within the rectangle W is about two times that of the weft Y exposed within the rectangle W on the obverse side of the woven fabric 24.
  • the total length of the warp T exposed within the rectangle H is about two times that of the weft Y exposed within the rectangle W on the obverse side of the woven fabric 24.
  • the total length of the warp threads T exposed in a predetermined area portion defined as a rectangle with an area that is a multiple integral of the area of the rectangle W or H is about two times that of the weft threads Y exposed in the same predetermined area portion.
  • abrasion resistance is impaired compared with those of the first and second embodiments.
  • further increasing the degree of intermingle between the warp threads and the weft threads stabilizes the texture of the fabric and prevents a break down of the structure during the resin impregnating step.
  • the present invention may also be embodied in the following modes.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Woven Fabrics (AREA)
EP99100360A 1998-02-18 1999-01-15 Dispositif d'insertion de la trame et ruban d'insertion pour métiers à tisser à griffes Withdrawn EP0939155A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3607498 1998-02-18
JP3607498 1998-02-18

Publications (2)

Publication Number Publication Date
EP0939155A2 true EP0939155A2 (fr) 1999-09-01
EP0939155A3 EP0939155A3 (fr) 1999-09-08

Family

ID=12459604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99100360A Withdrawn EP0939155A3 (fr) 1998-02-18 1999-01-15 Dispositif d'insertion de la trame et ruban d'insertion pour métiers à tisser à griffes

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Country Link
EP (1) EP0939155A3 (fr)
KR (1) KR100312674B1 (fr)
TW (1) TW422899B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1028184A1 (fr) * 1999-02-09 2000-08-16 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Dispositif d'insertion de la trame et ruban d'insertion pour métiers à tisser à griffes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100897544B1 (ko) * 2002-09-10 2009-05-14 파인텍스 주식회사 중조직의 레피어 밴드 및 그 제조방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102588A2 (fr) * 1982-09-03 1984-03-14 Vilminore Officine Meccaniche S.P.A. Courroie à flexibilité variable pour métiers à tisser à lances porte-trame
FR2582322A3 (fr) * 1985-05-22 1986-11-28 Lamiflex Srl Structure de lance pour metier a tisser sans navette.
EP0352223A1 (fr) * 1988-07-22 1990-01-24 GebràœDer Sulzer Aktiengesellschaft Dispositif d'insertion de trame d'un métier à tisser à pinces
EP0414214A2 (fr) * 1989-08-24 1991-02-27 Neste Oy Bande résistante à l'abrasion, et procédé pour sa fabrication
US5107903A (en) * 1989-11-03 1992-04-28 Nuovopignone - Industrie Meccaniche E Fonderia S.P.A. Guide block arrangement for a weft gripper tape

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102588A2 (fr) * 1982-09-03 1984-03-14 Vilminore Officine Meccaniche S.P.A. Courroie à flexibilité variable pour métiers à tisser à lances porte-trame
FR2582322A3 (fr) * 1985-05-22 1986-11-28 Lamiflex Srl Structure de lance pour metier a tisser sans navette.
EP0352223A1 (fr) * 1988-07-22 1990-01-24 GebràœDer Sulzer Aktiengesellschaft Dispositif d'insertion de trame d'un métier à tisser à pinces
EP0414214A2 (fr) * 1989-08-24 1991-02-27 Neste Oy Bande résistante à l'abrasion, et procédé pour sa fabrication
US5107903A (en) * 1989-11-03 1992-04-28 Nuovopignone - Industrie Meccaniche E Fonderia S.P.A. Guide block arrangement for a weft gripper tape

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1028184A1 (fr) * 1999-02-09 2000-08-16 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Dispositif d'insertion de la trame et ruban d'insertion pour métiers à tisser à griffes

Also Published As

Publication number Publication date
EP0939155A3 (fr) 1999-09-08
KR19990072540A (ko) 1999-09-27
TW422899B (en) 2001-02-21
KR100312674B1 (ko) 2001-11-03

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