EP0867544A1 - Méthode pour éloigner un fil de trame cassé - Google Patents

Méthode pour éloigner un fil de trame cassé Download PDF

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Publication number
EP0867544A1
EP0867544A1 EP98101073A EP98101073A EP0867544A1 EP 0867544 A1 EP0867544 A1 EP 0867544A1 EP 98101073 A EP98101073 A EP 98101073A EP 98101073 A EP98101073 A EP 98101073A EP 0867544 A1 EP0867544 A1 EP 0867544A1
Authority
EP
European Patent Office
Prior art keywords
weft yarn
faultily
faultily picked
yarn
picked
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Withdrawn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
EP98101073A
Other languages
German (de)
English (en)
Inventor
Hidetomo c/o Tsudakoma Kogyo K.K. Yoneda
Hideki c/o Tsudakoma Kogyo K.K. Nishinaga
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.)
Tsudakoma Corp
Original Assignee
Tsudakoma Industrial Co 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 Tsudakoma Industrial Co Ltd filed Critical Tsudakoma Industrial Co Ltd
Publication of EP0867544A1 publication Critical patent/EP0867544A1/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
    • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
    • D03D51/085—Extraction of defective weft
    • 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

Definitions

  • the present invention relates to a method of disposing of a faultily picked weft yarn in the cloth fell of a fabric on a loom upon the occurrence of a mispick.
  • JP-B Nos. 6-27399 and 7-122199 Methods of removing a faultily picked weft yarn from the cloth fell of a fabric are disclosed in JP-B Nos. 6-27399 and 7-122199. These prior art methods stops the loom with a faultily picked weft yarn connected to a main picking nozzle upon the occurrence of a mispick, reverses the loom so as to open the cloth fell so that the faultily picked weft yarn is released, picks a weft yarn continuous with the faultily picked weft by the main picking nozzle to transfer the weft continuous with the faultily picked weft to a drawing device disposed on a drawing side opposite a picking side, and then the faultily picked weft yarn is pulled out of the cloth fell along a U-shaped path.
  • a method of removing a faultily picked weft yarn disclosed in JP-A No. 61-245339 keeps a faultily picked weft yarn connected to a weft yarn extending in a main picking nozzle upon the occurrence of a mispick, and draws the faultily picked weft yarn toward a picking side to remove the faultily picked weft yarn from the cloth fell.
  • the former method i.e., the method disclosed in JP-B No. 6-27399 or 7-122199, needs to waste a great length of a weft yarn to remove the faultily picked weft yarn; that is, a length of a weft yarn for two picks is necessary to transfer the faultily picked weft yarn to the drawing device disposed on the drawing side.
  • the latter method i.e., the method disclosed in JP-A No.
  • 61-245339 needs only several loops of a weft yarn unwound from a yarn storage drum of a yarn measuring and storing device, the force exerted on the faultily picked weft yarn from the picking side does not work effectively as force for separating the faultily picked weft yarn from the cloth fell, so that the operation for removing the faultily picked weft yarn is unreliable.
  • a faultily picked weft yarn disposal method comprises steps of stopping a loom with a faultily picked weft yarn kept continuous with a weft yarn extending from a main picking nozzle upon the occurrence of a mispick, reversing the loom to open the cloth fell so that the faultily picked weft yarn is released from the cloth fell, feeding a length of the weft yarn necessary for making the leading end of the faultily picked weft yarn reach a faultily picked weft yarn extracting means disposed on a drawing side opposite a picking side from which the weft yarn is picked into a shed, making a plurality of auxiliary picking nozzles arranged along a path of a picked weft yarn jet a fluid to separate the faultily picked weft yarn in a U-shape from the cloth fell and to make the leading end of the faultily picked weft yarn reach the faultily picked weft yarn extracting means, and drawing the faultily picked we
  • the length of weft yarn necessary for making the leading end of the faultily picked weft yarn reach the faultily picked weft yarn extracting means is fed by making a feed nozzle disposed near the main picking nozzle jet a fluid to pull out the weft yarn extending within the main picking nozzle, by making the main picking nozzle jet a fluid to pull out the weft yarn extending within the main picking nozzle, or by making a feed nozzle disposed near the main picking nozzle jet a fluid to pull out the weft yarn extending within the main picking nozzle and making the main picking nozzle jet a fluid to insert the weft yarn thus pulled out from the main picking nozzle into a shed.
  • the faultily picked weft yarn extracting means may be a stretching nozzle or one or two rollers specially designed for taking up the faultily picked weft yarn.
  • a faultily picked weft yarn disposal method comprises steps of stopping a loom with a faultily picked weft yarn kept connected to a weft yarn extended in a main picking nozzle upon the occurrence of a mispick, opening the cloth fell so that the faultily picked weft yarn is released from the cloth fell, jetting a fluid by a plurality of auxiliary nozzles arranged along a path of the picked weft yarn to separate the faultily picked weft yarn from the cloth fell, feeding a length of the weft yarn necessary for making the leading end of the faultily picked weft yarn reach a faultily picked weft yarn extracting means disposed on a drawing side opposite a picking side from which the weft yarn is picked into a shed so that the leading end of the faultily picked weft yarn reaches the faultily picked weft yarn extracting means, and drawing the faultily picked weft yarn by the faultily picked weft yarn extracting means to remove the faultily picked weft yarn from the
  • a faultily picked yarn disposal method comprises steps of: stopping a loom with a faultily picked yarn kept continuous with a weft yarn extending from a main picking nozzle upon the occurrence of a mispick; opening the cloth fell of a fabric on the loom so that the faultily picked yarn is released from the cloth fell; feeding a length of the weft necessary for making the leading end of the faultily picked yarn reach a faultily picked yarn drawing means disposed on a drawing side opposite a picking side from which a weft yarn is picked into a shed; making a plurality of auxiliary picking nozzles arranged along a path of the picked weft yarn jet a fluid to separate the faultily picked yarn in a U-shape from the cloth fell and to transfer the leading end of the faultily picked yarn to a faultily picked yarn drawing means; drawing the faultily picked yarn by the faultily picked yarn drawing means to straighten the faultily picked yarn in the shed; and restarting the loom.
  • the faultily picked weft yarn disposal method of the present invention is able to remove a faultily picked weft yarn from the drawing side wasting short length of a weft yarn. Since the additionally length of a weft yarn is fed into an open shed by the agency of the auxiliary nozzles, the faultily picked weft yarn is separated from the cloth fell. Consequently, the leading end of the faultily picked weft yarn can be surely made to reach the faultily picked weft yarn drawing means and hence the faultily picked weft yarn can be removed with reliability.
  • any other special device for removing the faultily picked weft yarn is not necessary, so that work for handling yarns in the vicinity of the main picking nozzle and for operating devices disposed around the main picking nozzle is facilitated. If the faultily picked weft yarn is not damaged and maintains a normal quality, the faultily picked yarn is straightened in the shed and used as a weft yarn to avoid wasting the weft yarn.
  • the present invention is particularly effective in weaving a glass fiber fabric.
  • Fig. 1 shows the sequential steps of a faultily picked weft yarn disposal method in a first embodiment according to the present invention, in which faultily picked weft yarn removing operations and angular positions of the main shaft of a loom where the faultily picked weft yarn removing operations are to be carried out are indicated in the left end region of the drawing, the condition of a faultily picked weft yarn in a shed is indicated in the middle region of the drawing, and the positional relation between a shed, a faultily picked weft yarn in the cloth fell and a normally picked weft yarn is indicated in a right end region of the drawing.
  • Fig. 2 shows the sequential variation of the angular position of the main shaft of the loom during the faultily picked weft yarn removing operations.
  • a main picking nozzle 1 picks a length of a weft yarn 2 for one pick stored on a yarn measuring and storing device, not shown, into a shed 5 of warp yarns 4 every one picking cycle. If the weft yarn 2 is picked normally, a weft feeler 6 disposed on a drawing side opposite a picking side from which the weft yarn 2 is picked detects the arrival of the weft yarn 2 at a predetermined position on the drawing side. A stretching nozzle 10 sucks a leading end portion of the normally picked weft yarn 2 to tighten the weft yarn 2 properly in the shed 5.
  • the auxiliary nozzles 9 are actuated to separate the faultily picked weft yarn 3 from the cloth fell after reversing the main shaft of the loom to an angular position of about 180° in the faulty picking cycle in the foregoing embodiment, the auxiliary nozzles 9 may be actuated when the faultily picked weft yarn 3 is released from the warp yarns 4 during the reverse rotation of the main shaft toward the angular position of about 180°.
  • the stretching nozzle 10 is in operation during this reverse rotation of the main shaft of the loom.
  • All the auxiliary nozzles 9 of the first to the fifth auxiliary nozzle group are actuated simultaneously to blow the weft yarn 2 floating as shown in 3) of Fig. 1 is blown into a shed 5 of the warp yarns 4. Consequently, a section of the faultily picked weft yarn 3 is separated from the cloth fell as shown in 4) of Fig. 1 and is exposed to air jets jetted by the auxiliary nozzles 9 of the first auxiliary nozzle group, i.e., the leftmost auxiliary nozzle group. Then, the faultily picked weft yarn 3 is blown gradually toward the drawing side as indicated by broken lines in 4) of Fig. 1 by air jets jetted by the second to the fifth auxiliary nozzle group which are actuated sequentially in that order.
  • Air jetting periods of the second to the fifth auxiliary nozzle group are determined so that valves connected to the second to the fifth auxiliary nozzle group are closed immediately before the time when the faultily picked weft yarn 3 separated from the cloth fell is to be moved toward the drawing side to blow the faultily picked weft yarn 3 toward the drawing side by air jetted by a residual pressure remaining in pipes connected to the second to the fifth auxiliary nozzle group. More specifically, if the loom is of a 150 cm in weaving width and is provided with four auxiliary nozzle groups, the air jetting periods of the first to the fourth auxiliary nozzle group are 20 ms, 10 ms, 20 ms and 30 ms, respectively. If the air jetting periods are thus determined, the faultily picked weft yarn 3 can be moved at an appropriate speed, which is effective in weaving a glass fiber fabric.
  • Steps of a faultily picked weft yarn disposal method in a second embodiment according to the present invention are illustrated in Fig. 3.
  • This method inserts a necessary length of the weft yarn 2 into a shed of the warp yarns 4 by the main picking nozzle 1 while the main shaft of the loom is being turned in the reverse direction in a step shown in 3) of Fig. 3 to feed an additional length of the weft yarn 2.
  • Steps other than that shown in 3) of Fig. 3 are the same as those of the method in the first embodiment previously described with reference to Fig. 1.
  • the feed nozzle 7 is not actuated. Therefore, the weft yarn 2 is moved into the cutting region of the weft yarn cutter 8 as the slay moves forward by inertia for beating.
  • the operation of the weft yarn cutter 8 is controlled so that the weft yarn cutter 8 will not function while the weft yarn 2 is in the cutting region of the weft yarn cutter 8.
  • the faultily picked weft yarn 3 remains continuous with the weft yarn 2 extending from the main picking nozzle 1.
  • Steps of a faultily picked weft yarn disposal method in a third embodiment according to the present invention are illustrated in Fig. 4.
  • the feed nozzle 7 is actuated while the loom is stopped in a step shown in 2) of Fig. 4 to pull out a necessary length of the weft yarn 2 from the main picking nozzle 1, and the necessary length of the weft yarn 2 is blown into a shed 5 by jetting air by the main picking nozzle 1 in a step shown in 3) of Fig. 4 for reversing the loom to feed the necessary length of the weft yarn 2 into the shed 5.
  • the leading end of the faultily picked weft yarn 3 may be made to reach the faultily picked weft yarn extracting means 11 by feeding the necessary length of the weft yarn 2 after stretching the faultily picked weft yarn 3 by the agency of the auxiliary nozzles 9, which is particularly effective in weaving a glass fiber fabric.
  • the necessary length of the weft yarn 2 can be blown toward the drawing side by the currents of air jetted by the auxiliary nozzle 9 and the leading end portion of the faultily picked weft yarn 3 can be sucked into the stretching nozzle 10 without being bent if a resistance against the movement of the necessary length of the weft yarn 2 toward the drawing side is applied to the necessary length of the weft yarn 2 so that the necessary length of the weft yarn 2 cannot be easily inserted into the shed 5 when stretching the faultily picked weft yarn 3 by jetting air by the auxiliary nozzles 9 and the resistance is removed from the necessary length of the weft yarn 2 after the faultily picked weft yarn 3 has been entirely separated from the cloth fell and stretched in a straight line.
  • a frictional resistance can be applied to the weft yarn 2 by disposing a curved yarn guide having a cylindrical surface opposite to the feed nozzle 7 with respect to the weft yarn 2 and blowing air by the feed nozzle 7 against the weft yarn 2 so that the weft yarn 2 is pressed against the cylindrical surface of the yarn guide.
  • the necessary length of the weft yarn 2 may be unwound from the yarn storage drum of the yarn measuring and storing device by disengaging a yarn holding pin from the yarn storage drum after the faultily picked weft yarn 3 has been stretched in a straight line.
  • the faultily picked weft yarn extracting means 11 may be the stretching nozzle 10 which uses air currents for pulling the faultily picked weft yarn 3 or a pair of rollers which nips the faultily picked weft yarn 3 therebetween and rotate to take up the faultily picked weft yarn 3. More specifically, a pair of rollers are disposed so as to be able to be separated from each other instead of the stretching nozzle 10, the pair of rollers are separated from each other in the step shown in 4) of Fig. 1, and the leading end portion of the faultily picked weft yarn 3 reaches a position between the pair of rollers.
  • the pair of rollers are rotated after the weft yarn 2 has been cut and the faultily picked weft yarn 3 has been caught between the pair of rollers to extract the faultily picked weft yarn 3 from the shed 5. If a suction nozzle is disposed behind the pair of rollers with respect to a picking direction and the suction nozzle is operated while the faultily picked weft yarn 3 is being stretched in a straight line, the leading end portion of the faultily picked weft yarn 3 can be made easily to reach the position between the pair of rollers.
  • the faultily picked weft yarn extracting means 11 may be any suitable well-known extracting means other than the pair of rollers.
  • Steps of a faultily picked weft yarn disposal method in a fourth embodiment according to the present invention are illustrated in Figs. 5 and 6.
  • This method does not remove a mispicked yarn 3 and uses the same as a normal weft yarn.
  • Step 1 for detecting a short pick, step 2 for stopping the loom, step 3 for reversing the loom, step 4 for jetting a fluid through the auxiliary picking nozzles and step 5 for sucking the faultily picked yarn are the same as those illustrated in Fig. 1.
  • the faultily picked weft yarn 3 is straightened in the shed 5 by suction.
  • the stretching nozzle 10 serves as a drawing device 14 for holding the faultily picked weft yarn 3 transferred thereto straight in the shed 5.
  • step 6 the main shaft of the loom is reversed to an angular position of about 50° in the faulty picking cycle. Then, the loom is restarted with the faultily picked weft yarn 3 held taut at a predetermined tension by the drawing device 14. After the loom has been started, the faultily picked weft yarn 3 is held by a catch cord 15 disposed on the drawing side of the loom.
  • the faultily picked weft yarn 3 is cut at a position between the catch cord 15 and the drawing device 14 by a cutter 16, and a cut portion of the faultily picked weft yarn 3 is delivered outside by the drawing device 14.
  • the faultily picked weft yarn 3 continuous with the weft yarn 2 is cut at a position between the selvedge on the drawing side and the catch cord 15 by a cutter 17. If most part of the faultily picked weft yarn 3 is damaged by air blown by the feed nozzle 7 and is incapable of being used as a normal weft yarn 2, the damaged faultily picked weft yarn 3 is removed entirely by feeding a length of the weft yarn 2 necessary for one pick from the feed side.
  • the drawing device 14 need not necessarily be the stretching nozzle 10, but may be a suction device using a blower or a take-up roller device.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP98101073A 1997-03-24 1998-01-22 Méthode pour éloigner un fil de trame cassé Withdrawn EP0867544A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP88802/97 1997-03-24
JP8880297 1997-03-24

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EP0867544A1 true EP0867544A1 (fr) 1998-09-30

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EP98101073A Withdrawn EP0867544A1 (fr) 1997-03-24 1998-01-22 Méthode pour éloigner un fil de trame cassé

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EP (1) EP0867544A1 (fr)
KR (1) KR100266959B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1367160A1 (fr) * 2002-05-28 2003-12-03 Tsudakoma Kogyo Kabushiki Kaisha Méthode pour enlever une trame dans un métier à tisser
BE1023294B1 (fr) * 2014-09-09 2017-01-25 Kabushiki Kaisha Toyota Jidoshokki Procede pour retirer un fil de trame qui a ete incorrectement entrecroise dans un metier a tisser du type a jet d'air

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61245339A (ja) * 1985-04-24 1986-10-31 津田駒工業株式会社 無杼織機の不完全よこ入れ糸除去装置
EP0200168A2 (fr) * 1985-04-24 1986-11-05 Tsudakoma Corporation Dispositif pour retirer des fils de trame défectueux dans les métiers à tisser sans navette
NL8602191A (nl) * 1986-08-28 1988-03-16 Picanol Nv Werkwijze voor het verwijderen van een foutieve inslagdraad bij een weefproces.
EP0322576A1 (fr) * 1987-12-29 1989-07-05 Zvs Vyzkumnevyvojovy Ustav Koncernova Ucelova Organizace Méthode pour dégager et réparer des fils de trame mal insérés dans la trame de métiers à tuyère
EP0534541A1 (fr) * 1991-09-18 1993-03-31 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Procédé pour retirer automatiquement un fil de trame cassé de la foule sur un métier à tisser à jet d'air et dispositif pneumomécanique utilisé dans ce procédé

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1000883A3 (nl) * 1987-08-26 1989-05-02 Picanol Nv Werkwijze voor het verwijderen van een foutieve inslagdraad uit de gaap van een weefmachine en weefmachine die deze werkwijze toepast

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61245339A (ja) * 1985-04-24 1986-10-31 津田駒工業株式会社 無杼織機の不完全よこ入れ糸除去装置
EP0200168A2 (fr) * 1985-04-24 1986-11-05 Tsudakoma Corporation Dispositif pour retirer des fils de trame défectueux dans les métiers à tisser sans navette
NL8602191A (nl) * 1986-08-28 1988-03-16 Picanol Nv Werkwijze voor het verwijderen van een foutieve inslagdraad bij een weefproces.
EP0322576A1 (fr) * 1987-12-29 1989-07-05 Zvs Vyzkumnevyvojovy Ustav Koncernova Ucelova Organizace Méthode pour dégager et réparer des fils de trame mal insérés dans la trame de métiers à tuyère
EP0534541A1 (fr) * 1991-09-18 1993-03-31 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Procédé pour retirer automatiquement un fil de trame cassé de la foule sur un métier à tisser à jet d'air et dispositif pneumomécanique utilisé dans ce procédé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1367160A1 (fr) * 2002-05-28 2003-12-03 Tsudakoma Kogyo Kabushiki Kaisha Méthode pour enlever une trame dans un métier à tisser
US6953066B2 (en) 2002-05-28 2005-10-11 Tsudakoma Kogyo Kabushiki Kaisha Method of disposing weft in a loom
BE1023294B1 (fr) * 2014-09-09 2017-01-25 Kabushiki Kaisha Toyota Jidoshokki Procede pour retirer un fil de trame qui a ete incorrectement entrecroise dans un metier a tisser du type a jet d'air

Also Published As

Publication number Publication date
KR100266959B1 (ko) 2000-09-15
KR19980079639A (ko) 1998-11-25

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