EP1275760B1 - Buse d'insertion de trame pour un métier à tisser à jet d'air - Google Patents

Buse d'insertion de trame pour un métier à tisser à jet d'air Download PDF

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Publication number
EP1275760B1
EP1275760B1 EP20020014943 EP02014943A EP1275760B1 EP 1275760 B1 EP1275760 B1 EP 1275760B1 EP 20020014943 EP20020014943 EP 20020014943 EP 02014943 A EP02014943 A EP 02014943A EP 1275760 B1 EP1275760 B1 EP 1275760B1
Authority
EP
European Patent Office
Prior art keywords
weft
passage
thread guide
air flow
conveying nozzle
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
EP20020014943
Other languages
German (de)
English (en)
Other versions
EP1275760A3 (fr
EP1275760A2 (fr
Inventor
Yoichi K.K. Toyota Jidoshokki Makino
Tomoyuki K.K. Toyota Jidoshokki Takahashi
Motoaki K.K. Toyota Jidoshokki Toda
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
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Toyota Industries Corp
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Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP1275760A2 publication Critical patent/EP1275760A2/fr
Publication of EP1275760A3 publication Critical patent/EP1275760A3/fr
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Publication of EP1275760B1 publication Critical patent/EP1275760B1/fr
Anticipated expiration legal-status Critical
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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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3006—Construction of the nozzles
    • D03D47/3013—Main nozzles

Definitions

  • the present invention relates to a weft conveying nozzle in an air jet loom, comprising a thread guide defining a weft passage for the introduction thereinto of a weft (Y) for guidance, and an air flow passage for causing air to flow toward said weft passage along an outer peripheral surface of the thread guide, said air flow passage being extended to a weft route in front of said weft passage to overlap the same, said weft passage in said thread guide having a circular sectional configuration.
  • a weft conveying nozzle is disclosed in EP-A-0 015 399.
  • a weft is stored for length measurement in a weft length measurement storage device, and the stored weft is drawn out from the weft length measurement storage device by the air jet action of a weft inserting main nozzle before effecting weft insertion.
  • To attain an increase in speed which is an advantage of an air jet loom, it is necessary to increase the speed at which weft insertion is performed. To achieve this, it is necessary to draw out the weft from the weft length measurement storage device within a limited period of time.
  • a plurality of cutouts are provided at the forward end of a thread guide to avoid rapid expansion of an air flow in a pipe in which the air flow is mixed with a weft.
  • the purpose of avoiding rapid expansion of the air flow in the mixing pipe is to prevent generation of a turbulent flow. Preventing generation of the turbulent flow contributes to increasing weft inserting speed.
  • the flow velocity of the air directly in front of the outlet of the thread guide is minimum in the vicinity of an extension of a center axis line of the weft passage in the thread guide.
  • the weft flies in the vicinity of the extension of the center axis line of the weft passage. That is, the high velocity portion of the air flow directly in front of the outlet of the thread guide is not effectively utilized in the flying of the weft.
  • the plurality of cutouts in the threading nozzle disclosed in Japanese Patent Application Laid-Open No. Hei 9-21035 are arranged circumferentially and in bilateral symmetry.
  • the air flowing into the weft passage in the thread guide from the cutouts is bilaterally symmetrical.
  • the bilateral symmetry of the air flow entering from the cutouts into the weft passage makes the portion in the vicinity of the extension of the center axis line of the weft passage in the thread guide a minimum velocity air flow portion.
  • a substantial increase in the weft inserting speed is not to be expected.
  • the invention relates to a weft conveying nozzle as initially defined, characterized in that a forward end portion of the thread guide terminates in a unitary surface (S, S1, C1, C2) obliquely intersecting the center axis line (L) of said weft passage.
  • the existence of the oblique unitary surface of the thread guide shifts, directly in front of the outlet of the thread guide, the minimum velocity portion of the air flow from the vicinity of an extension of a center axis line of the weft passage. That is, directly in front of the outlet of the thread guide, the high velocity portion of the air flow enters the vicinity of the extension of the center axis line of the weft passage, and the high velocity portion of the air flow directly in front of the outlet of the thread guide is effectively utilized in the flying of the weft.
  • the diameter of the weft passage in the thread guide for passing the weft is very small.
  • a very sophisticated machining technique is required.
  • the formation of a unitary deflective inflow portion by cutting can be effected relatively easily.
  • a weft conveying nozzle 11 is composed of a cylindrical nozzle body 12, an accelerating tube 13 fitted into the nozzle body 12, a cylindrical thread guide 14 threadely engaged with the nozzle body 12, and a lock nut 15 for fastening the thread guide 14 to the nozzle body 12.
  • the forward end portion of the thread guide 14 is formed as a conical flow passage forming portion 141, and, in the middle of the flow passage forming portion 141, a plurality of positioning fins 142 are arranged circumferentially. The tips of the positioning fins 142 are in contact with the inner peripheral surface of the nozzle body 12.
  • the accelerating tube 13 is composed of a base tube 131 fitted into the nozzle body 12 and a thin tube 132 fitted into the base tube 131.
  • the forward end portion of the flow passage forming portion 141 of the thread guide 14 enters in the base tube 131.
  • An annular air flow passage 16 is formed between the outer peripheral surface of the forward end portion of the flow passage forming portion 141 of the thread guide 14 and the tapered inner peripheral surface of the base tube 131.
  • a connection port 121 is formed in the nozzle body 12 so as to communicate with the interior of the nozzle body 12, and an air supply pipe 17 is connected to the connection port 121.
  • the air supplied from the air supply pipe 17 flows through the air flow passage 16, the base tube 131, and the thin tube 132.
  • a weft Y is passed through a weft passage 143 of the thread guide 14 and a traction passage 133 in the accelerating tube 13.
  • a deflective inflow portion 18 is formed at the forward end of the flow passage forming portion 141 of the thread guide 14.
  • the deflective inflow portion 18 is formed by cutting the forward end portion of the flow passage forming portion 141 along a plane S that is oblique with respect to the center axis line L of the weft passage 143.
  • the deflective inflow portion 18 is arranged in the plane S that is a unitary surface.
  • the deflective inflow portion 18 formed by cutting along the plane S is cut from the outlet 144 of the weft passage 143 toward the inlet 145 of the weft passage 143.
  • the entire deflective inflow portion 18 is surrounded by the air flow passage 16.
  • the weft passage 143 of the thread guide 14 has a circular sectional configuration.
  • the area of the deflective inflow portion 18 formed by slicing the weft passage 143 along the plane S (the area of the shaded portion in Fig. 1C) is larger than that of the circular sectional portion of the weft passage 143.
  • the weft Y which is passed through the weft passage 143 of the thread guide 14 and the traction passage 133 in the accelerating tube 13, receives a driving force due to the air flow in the traction passage 133 in the accelerating tube 13 in front of the forward end of the thread guide 14.
  • the traction passage 133 which constitutes the weft passage in front of the weft passage 143, is connected to the air flow passage 16, and is a region where the weft Y and air flow exist.
  • a deflective inflow portion 19 is formed by cutting the forward end portion of the thread guide 14 along the unitary surface S1 so as not to slice the weft passage 143.
  • a deflective inflow portion 20 is formed by cutting the forward end portion of the thread guide 14 along a unitary concave surface C1 so as to slice the weft passage 143.
  • a deflective inflow portion 21 is formed by cutting the forward end portion of the thread guide 14 along a unitary convex surface C2 so as to slice the weft passage 143.
  • Each of the deflective inflow portions 19 through 21 in the second through fourth embodiments is surrounded by the air flow passage 16.
  • the disclosed embodiments of the present invention provide a weft conveying nozzle advantageous in increasing the weft inserting speed.

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

Claims (5)

  1. Buse de transport de fil de trame (11) dans un métier à tisser à jet d'air, comprenant un guide-fil (14) définissant un passage (143) pour le fil de trame pour que vienne s'y introduire un fil de trame (Y) à des fins de guidage, et un passage d'écoulement pour l'air (16) pour faire en sorte que de l'air s'écoule en direction dudit passage pour fil de trame (143) le long de la surface périphérique externe du guide-fil (14), ledit passage d'écoulement pour l'air (16) s'étendant en direction d'une voie de défilement de fil de trame à l'avant dudit passage pour fil de trame (143) dans ledit guide-fil (14), possédant une configuration circulaire en section transversale, caractérisée en ce que la portion terminale avant du guide-fil (14) se termine en une surface unitaire (S, S1, C1, C2) qui coupe en oblique la ligne axiale centrale (L) dudit passage (143) pour le fil de trame.
  2. Buse de transport de fil de trame dans un métier à tisser à jet d'air selon la revendication 1, caractérisée en ce que la surface unitaire est un plan (S1, S2).
  3. Buse de transport de fil de trame dans un métier à tisser à jet d'air selon la revendication 1, caractérisée en ce que la surface unitaire est concave.
  4. Buse de transport de fil de trame dans un métier à tisser à jet d'air selon la revendication 3, caractérisée en ce que la surface unitaire est concave (C1).
  5. Buse de transport de fil de trame dans un métier à tisser à jet d'air selon la revendication 3, caractérisée en ce que la surface unitaire est convexe (C2).
EP20020014943 2001-07-11 2002-07-08 Buse d'insertion de trame pour un métier à tisser à jet d'air Expired - Lifetime EP1275760B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001210823 2001-07-11
JP2001210823A JP4461650B2 (ja) 2001-07-11 2001-07-11 エアジェットルームにおける緯糸搬送ノズル

Publications (3)

Publication Number Publication Date
EP1275760A2 EP1275760A2 (fr) 2003-01-15
EP1275760A3 EP1275760A3 (fr) 2004-01-14
EP1275760B1 true EP1275760B1 (fr) 2007-01-10

Family

ID=19046234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020014943 Expired - Lifetime EP1275760B1 (fr) 2001-07-11 2002-07-08 Buse d'insertion de trame pour un métier à tisser à jet d'air

Country Status (4)

Country Link
EP (1) EP1275760B1 (fr)
JP (1) JP4461650B2 (fr)
CN (1) CN1229531C (fr)
DE (1) DE60217443T2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007308825A (ja) * 2006-05-17 2007-11-29 Toyota Central Res & Dev Lab Inc エアジェットルームにおける緯入れ装置
JP2008057070A (ja) * 2006-08-31 2008-03-13 Tsudakoma Corp 流体噴射式織機の緯入れノズル
CN107986078B (zh) * 2017-11-15 2019-10-25 李天合 一种印刷包装设备的计数、吹标分叠装置及方法
CN112553752B (zh) * 2020-12-17 2022-04-26 苏州新东南纺织科技有限公司 一种喷气织机喷嘴
JP7586058B2 (ja) 2021-11-29 2024-11-19 株式会社豊田自動織機 エアジェット織機における緯糸搬送ノズル
JP7750798B2 (ja) * 2022-06-15 2025-10-07 株式会社豊田自動織機 エアジェット織機の緯糸搬送ノズル

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH610366A5 (en) * 1976-09-27 1979-04-12 Rueti Ag Maschf Device for inserting weft threads into a shed
DE2911862A1 (de) * 1979-03-13 1980-09-25 Sulzer Ag Duesenanordnung fuer eine webmaschine mit strahleintrag
JPS5771445A (en) * 1980-10-15 1982-05-04 Nissan Motor Wefting nozzle of air jet type loom
CS249259B1 (en) * 1983-08-01 1987-03-12 Frantisek Vykydal Pick insertion device for jet loom
DE19511439C1 (de) * 1995-03-29 1996-03-14 Dornier Gmbh Lindauer Verfahren zur Leistungssteigerung beim Schußfadeneintrag in ein Webfach einer Luftdüsenwebmaschine und Eintragsdüse zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
EP1275760A3 (fr) 2004-01-14
JP4461650B2 (ja) 2010-05-12
DE60217443T2 (de) 2007-08-23
JP2003020543A (ja) 2003-01-24
EP1275760A2 (fr) 2003-01-15
CN1396323A (zh) 2003-02-12
DE60217443D1 (de) 2007-02-22
CN1229531C (zh) 2005-11-30

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