EP3936649A1 - Dispositif pour tendre un fil de trame - Google Patents

Dispositif pour tendre un fil de trame Download PDF

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Publication number
EP3936649A1
EP3936649A1 EP21181047.8A EP21181047A EP3936649A1 EP 3936649 A1 EP3936649 A1 EP 3936649A1 EP 21181047 A EP21181047 A EP 21181047A EP 3936649 A1 EP3936649 A1 EP 3936649A1
Authority
EP
European Patent Office
Prior art keywords
weft yarn
air
stretch
travel passage
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.)
Granted
Application number
EP21181047.8A
Other languages
German (de)
English (en)
Other versions
EP3936649B1 (fr
Inventor
Daisuke Yagi
Yuichiro KIGUCHI
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
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Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP3936649A1 publication Critical patent/EP3936649A1/fr
Application granted granted Critical
Publication of EP3936649B1 publication Critical patent/EP3936649B1/fr
Active legal-status Critical Current
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
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/308—Stretching or holding the 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • D03D47/278—Guide mechanisms for pneumatic looms

Definitions

  • the present invention relates to a weft yarn tensioning device of an air jet loom.
  • an air jet loom needs to be configured to suppress loosening of a weft yarn by applying an adequate tension to the weft yarn having been inserted.
  • a weft yarn tensioning device for applying a tension to a weft yarn a weft yarn tensioning device disclosed in Japanese Patent Application No. 2010-285713 has been known.
  • the weft yarn tensioning device disclosed in Japanese Patent Application No. 2010-285713 has been known.
  • 2010-285713 applies a tension to a weft yarn by discharging air from an air discharge nozzle disposed on a rear side of the air jet loom towards the front side thereof so as to bend the weft yarn and introducing such a weft yarn to a stretch pipe disposed on the front side of the air jet loom.
  • the present invention has been made to solve the above problem and is directed to providing a weft yarn tensioning device that can applies a sufficient tension to a weft yarn with a simple configuration.
  • a weft yarn tensioning device of an air jet loom in which a weft yarn is inserted along a weft yarn guide passage formed in a reed.
  • the weft yarn tensioning devise is disposed in front of the reed.
  • the weft yarn tensioning device includes a weft yarn travel passage extending along the weft yarn guide passage, a first air discharge member discharging an air in a direction along the weft yarn travel passage, and a second air discharge member discharging the air in a direction different from the direction along the weft yarn travel passage.
  • the first air discharge member discharges the air to introduce the weft yarn into the weft yarn travel passage.
  • the second air discharge member discharges the air to the weft yarn in the weft yarn travel passage.
  • the weft yarn travels through the weft yarn guide passage 11 from an upstream to a downstream thereof along a flow of air discharged from a main nozzle and a sub-nozzle (not illustrated) for weft insertion.
  • the main nozzle and the sub-nozzle are disposed on the upstream side of the air jet loom.
  • the modified reed 10 corresponds to a reed of the present invention.
  • a projection 42 is formed in an upper portion 41 of the stretch mechanism 40, and the projection 42 projects from a main body of the stretch mechanism 40 towards the front side of the air jet loom.
  • An air blow hole 60 is formed on a left side of the projection 42, i.e., on the upstream side in the weft travelling direction, as viewed from the front side of the air jet loom, which is used for air blow to the weft yarn in the weft yarn travel passage forming member 50.
  • An air blow hose 62 is connected to the air blow hole 60 via an air blow joint 61.
  • the air blow hose 62 is connected via a known air valve (not illustrated) to an air supply source (not illustrated) installed in a weaving factory.
  • a stretch air hole 70 is formed in a lower portion 43 of the stretch mechanism 40 so as to discharge stretch air to the weft yarn in the inner space of the weft yarn travel passage forming member 50.
  • a stretch air hose 72 is connected to the stretch air hole 70 via a stretch air joint 71.
  • the stretch air hose 72 is connected via a known air valve (not illustrate) to an air supply source (not illustrated) in the plant.
  • the air jet loom has a control device (not illustrated) for controlling air supplies to the air blow hole 60 and the stretch air hole 70.
  • FIG.3 is a schematic plan view of the air jet loom of FIG. 1 in which the modified reed 10 and the stretch mechanism 40 are illustrated in cross section, taken along a horizontal direction along the weft yarn guide passage 11.
  • the modified reed 10 includes a plurality of dents 12 arranged at regular intervals along the weft travelling direction and extending perpendicularly to the weft travelling direction.
  • a warp yarn 21 to form a woven fabric 31 with weft yarns 23, or a selvage yarn 22 to form selvages 32 with the weft yarns 23, are disposed between any two of the dents 12.
  • the bending portion 54 has a stretch air discharge port 74 that is connected to the stretch air passage 73 (see FIG. 4 ) at a position where the width of the inner space of the weft yarn travel passage forming member 50 is the narrowest and is opened upwardly in a substantially vertical direction.
  • the stretch air hole 70 is in communication with the stretch air discharge port 74 through the stretch air passage 73.
  • the stretch air discharge port 74 and the air release hole 53 are opened so that opening of the stretch air discharge port 74 and the air release hole 53 substantially overlap with each other, as viewed in the vertical direction.
  • the stretch air discharge port 74 corresponds to a second air discharge member.
  • An air blow nozzle 63 is formed in the projection 42, and the air blow nozzle 63 has the air blow hole 60 as an inlet through which air flows into the air blow nozzle 63.
  • the air blow nozzle 63 extends along a part of the inner wall of the weft yarn travel passage forming member 50 between the bending portion 54 and the yarn outlet 52, to a position between the bending portion 54 and the yarn outlet 52.
  • the air blow nozzle 63 has an air blow port 64 at a tip end that is opposite from the air blow hole 60.
  • the air blow port 64 is opened to the inner space of the weft yarn travel passage forming member 50 on the right side of the bending portion 54, i.e., on the side of the weft yarn travel passage adjacent to the yarn outlet 52, and at a position between the bending portion 54 and the yarn outlet 52.
  • a space is formed between the air blow port 64 and the part of the inner wall of the weft yarn travel passage forming member 50 between the bending portion 54 and the yarn outlet 52, which allows the weft yarn 23 to pass therethrough.
  • the air blow nozzle 63 corresponds to a first air discharge member.
  • the stretching air supplied to the stretch air hole 70 flows through the stretch air passage 73 in a direction indicated by an arrow D, which is an upward direction. Then, the stretching air is discharged from the stretch air discharge port 74 illustrated in FIG. 6 in the substantially vertical direction. That is, the stretching air is discharged from the stretch air discharge port 74 in a direction different from the direction along the weft yarn travel passage forming member 50.
  • the stretching air is discharged preferably at a timing at which the weft yarn 23 is travelled and fully stretched. Then, the stretching air flows out mainly from the air release hole 53 (see FIG. 4 ) formed in the upper portion of the weft yarn travel passage forming member 50.
  • the air blow (air discharge) from the air blow nozzle 63 illustrated in FIG. 6 in the direction along the weft yarn travel passage forming member 50 is intensified may be considered.
  • a covered yarn is used for the weft yarn 23
  • a covering yarn may travel separately from and ahead of a core yarn of the weft yarn 23, and is discharged out from the yarn outlet 52 ahead of the core yarn.
  • the weft yarn detection device 14 for the weft yarn 23 disposed on the right of the stretch mechanism 40, as illustrated in FIG. 3 may detect the separated covering yarn, which may result in excessive detection of a long pick and yarn breakage of the weft yarns 23 caused by air-blow. Therefore, this method may cause unnecessary stops during the weaving process, which may lead to an increase the cost for weaving.
  • air is discharged from the air blow nozzle 63 in the direction along the weft yarn travel passage forming member 50, and the stretching air is discharged from the stretch air discharge port 74 to the weft yarn introduced to the inner space of the weft yarn travel passage forming member 50 in the direction of the arrow H, i.e., upward in the substantially vertical direction. Therefore, the yarns is unlikely to push the dents of the modified reed 10, which prevents damaging the modified reed 10.
  • the stretch mechanism 40 includes the weft yarn travel passage forming member 50 disposed in front of the modified reed 10 and extending along the weft yarn guide passage 11 in the air jet loom in which the weft yarn 23 is inserted along the weft yarn guide passage 11 formed in the modified reed 10, the air blow nozzle 63 from which air is discharged in the direction along the weft yarn travel passage forming member 50, and the stretch air discharge port 74 from which the stretch air is discharged in the direction different from the direction along the weft yarn travel passage forming member 50.
  • the air blow nozzle 63 is configured to discharge air to cause the weft yarn 23 to be introduced to the inner space of the weft yarn travel passage forming member 50, and the stretch air discharge port 74 is configured to discharge air to the weft yarn 23 having been introduced into the inner space of the weft yarn travel passage forming member 50.
  • a sufficient tension may be applied to the weft yarn 23 with a simple configuration of the weft yarn tensioning device.
  • the stretch mechanism 40 of the present embodiment air is discharged from the stretch air discharge port 74 at the bending portion 54.
  • the weft yarn 23 that is bent towards the front side of the air jet loom at the bending portion 54 is bent upward in the substantially vertical direction, i.e., in the direction of the arrow H, and pressed against the upper surface of the inner wall of the bending portion 54 and against the corner 53a of the air release hole 53, so that a great frictional force is generated.
  • a further greater tension may be applied to the weft yarn 23.
  • the stretch air discharge port 74 is opened upward in the substantially vertical direction in the above-described embodiment, the stretch air discharge port 74 may be opened in a direction other than the direction in which air is discharged from the air blow nozzle 63.
  • the stretch air discharge port 74 may be opened towards the front side of the air jet loom, i.e., in a direction away from the modified reed 10.
  • the stretch mechanism 40 applies a tension to the weft yarn 23 by discharging stretch air in a direction different from the direction along the travelling direction of the weft yarn 23, similarly to the above described embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP21181047.8A 2020-07-07 2021-06-23 Dispositif pour tendre un fil de trame Active EP3936649B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020116908A JP2022014545A (ja) 2020-07-07 2020-07-07 緯糸張力付与装置

Publications (2)

Publication Number Publication Date
EP3936649A1 true EP3936649A1 (fr) 2022-01-12
EP3936649B1 EP3936649B1 (fr) 2023-06-14

Family

ID=76584360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21181047.8A Active EP3936649B1 (fr) 2020-07-07 2021-06-23 Dispositif pour tendre un fil de trame

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EP (1) EP3936649B1 (fr)
JP (1) JP2022014545A (fr)
CN (1) CN113913999B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023156763A (ja) 2022-04-13 2023-10-25 株式会社豊田自動織機 エアジェット織機の緯糸張力付与装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1017893A5 (nl) * 2007-12-10 2009-10-06 Te Strake Textile Bv Strekinrichting voor het strekken van een inslagdraad.
JP2010285713A (ja) 2009-06-11 2010-12-24 Toyota Industries Corp エアジェット織機における緯糸張力付与装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000170057A (ja) * 1998-12-09 2000-06-20 Toyota Autom Loom Works Ltd ジェットルームにおける緯糸張力付与装置
DE10224078A1 (de) * 2002-05-31 2003-12-18 Dornier Gmbh Lindauer Verfahren zum Gestreckthalten eines Schussfadens und Webmaschine zur Verfahrensdurchführung
JP2004218103A (ja) * 2003-01-10 2004-08-05 Tsudakoma Corp 流体噴射式織機の緯糸張力付与装置
JP4410048B2 (ja) * 2004-02-19 2010-02-03 株式会社豊田中央研究所 ジェットルームにおける緯糸張力付与装置
JP5689827B2 (ja) * 2011-02-01 2015-03-25 株式会社豊田中央研究所 緯糸張力付与装置
JP5884774B2 (ja) * 2013-05-29 2016-03-15 株式会社豊田自動織機 エアジェット織機における緯糸張力付与装置
JP6119715B2 (ja) * 2014-10-27 2017-04-26 株式会社豊田自動織機 エアジェット織機における緯糸張力付与装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1017893A5 (nl) * 2007-12-10 2009-10-06 Te Strake Textile Bv Strekinrichting voor het strekken van een inslagdraad.
JP2010285713A (ja) 2009-06-11 2010-12-24 Toyota Industries Corp エアジェット織機における緯糸張力付与装置

Also Published As

Publication number Publication date
CN113913999B (zh) 2022-10-04
JP2022014545A (ja) 2022-01-20
CN113913999A (zh) 2022-01-11
EP3936649B1 (fr) 2023-06-14

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