EP2455520A2 - Luftdüsenwebmaschine mit profiliertem Riet - Google Patents

Luftdüsenwebmaschine mit profiliertem Riet Download PDF

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Publication number
EP2455520A2
EP2455520A2 EP11189875A EP11189875A EP2455520A2 EP 2455520 A2 EP2455520 A2 EP 2455520A2 EP 11189875 A EP11189875 A EP 11189875A EP 11189875 A EP11189875 A EP 11189875A EP 2455520 A2 EP2455520 A2 EP 2455520A2
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EP
European Patent Office
Prior art keywords
wall surface
distance
curvature
lower jaw
reed
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
EP11189875A
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English (en)
French (fr)
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EP2455520A3 (de
EP2455520B1 (de
Inventor
Yoichi Makino
Isao Makino
Shinji Takagi
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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Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP2455520A2 publication Critical patent/EP2455520A2/de
Publication of EP2455520A3 publication Critical patent/EP2455520A3/de
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    • 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
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/60—Construction or operation of slay
    • D03D49/62—Reeds mounted on slay

Definitions

  • the present invention relates to a profile reed for an air jet loom.
  • Japanese Patent Application Publication No. 8-74143 discloses a profile reed for an air jet loom.
  • the profile reed for the air jet loom disclosed in the above Publication forms a weft yarn passage.
  • the weft yarn passage is formed such that a weft yarn can fly through the weft yarn passage at a relatively high speed with stability.
  • Fig. 4 is an enlarged fragmentary side view showing a reed dent 51 of the profile reed for the air jet loom disclosed in the above Publication.
  • the reed dent 51 is formed with a guide recess 52 having an upper wall surface 52A, an inner wall surface 52B, a lower wall surface 52C, the upper arcuate surface 52D and a lower arcuate surface 52E.
  • the reed dent 51 is formed in such a way that the distance Wa between the inner wall surface 52B and the front end of the reed dent 51 adjacent to the upper wall surface 52A is 9.0 millimeters (mm) and the distance Wb between the upper wall surface 52A and the lower wall surface 52C, which is substantially the same as the vertical dimension of the inner wall surface 52B, is 5.5 mm.
  • the reed dent 51 is also formed such that the distance Wc between the inner wall surface 52B and the front end of the reed dent 51 adjacent to the lower wall surface 52C is 4.0 mm.
  • the distance L1 between the upper wall surface 52A and the injection hole 53A of the weft insertion sub-nozzle 53 and the distance L2 between the front end of the reed dent 51 adjacent to the lower wall surface 52C and the injection hole 53A are set such that the weft yarn insertion sub-nozzle 53 does not cause any adverse effect on the quality of woven cloth.
  • the reed dent 51 is formed such that the radius of curvature r of the upper arcuate surface 52D is 0.5 mm, and the radius of curvature R of the lower arcuate surface 52E is 2.0 mm.
  • the front end of the reed dent 51 adjacent to the lower wall surface 52C is formed with a radius of curvature that is substantially the same as the radius of curvature R of the lower arcuate surface 52E, so that the lower wall surface 52C is formed only by a curved surface.
  • the weft insertion sub-nozzle 53 can be located closer to the reed dent 51 thereby to shorten the distance between the inner wall surface 52B and the injection hole 53A of the weft insertion sub-nozzle 53, so that the air consumption of the weft insertion sub-nozzle 53 may be reduced.
  • the frequency of the weft insertion failure is increased depending on the count of the weft yarns to be inserted. More particularly, the frequency of the weft insertion failure tends to be increased with a decrease of the yarn count of weft yarns to be inserted.
  • the present invention is directed to providing a profile reed for an air jet loom which reduces the frequency of weft insertion failure while maintaining the air consumption of the weft insertion sub-nozzle substantially the same as in the case of the background art.
  • a profile reed for an air jet loom includes a dent and a weft yarn passage.
  • the dent has a guide recess and a lower jaw portion located below the guide recess.
  • the weft yarn passage is formed by a plurality of the dents juxtaposed in the direction of weft insertion.
  • the guide recess is formed with an upper wall surface, an inner wall surface and a lower wall surface.
  • the inner wall surface is connected with the lower wall surface through a lower arcuate surface formed with a radius of curvature.
  • the front end of the lower jaw portion is defined by a lower jaw arcuate surface formed with a radius of curvature.
  • the lower jaw portion extends frontward for a distance between the inner wall surface and the front end of the lower jaw portion. The distance is set at or lower than 5.0 millimeters. The sum of radii of curvature is smaller than the distance.
  • the air jet loom has a weft insertion mechanism 10 having a profile reed 11 and a slay 12.
  • the profile reed 11 includes a plurality of dents 13 juxtaposed in the direction of weft insertion and is fixedly mounted on the slay 12, as shown in Fig. 1 .
  • Each dent 13 has a guide recess 14, and a plurality of the guide recesses 14 cooperate to form a weft yarn passage 15 in the profile reed 11.
  • the air jet loom has a weft insertion main nozzle 16 disposed so as to face the inlet of the weft yarn passage 15 for injecting air for insertion of a weft yarn Y along the weft yarn passage 15.
  • the air jet loom further has a plurality of weft insertion sub-nozzles 17 mounted to the front surface of the slay 12 at a predetermined spaced interval along the weft yarn passage 15.
  • Each weft insertion sub-nozzle 17 has an injection hole 18 formed at the end thereof and directed such that air issued from the injection hole 18 is directed obliquely along the weft yarn passage 15.
  • the weft yarn passage 15 is formed in the profile reed 11, and each injection hole 18 of the weft insertion sub-nozzle 17 is directed along the weft yarn passage 15. In weft insertion, the weft insertion sub-nozzles 17 enter into a shed of the warp yarns T while separating the warp yarns T.
  • the weft insertion sub-nozzles 17 move out from the shed of the warp yarns T.
  • the diameter of the weft insertion sub-nozzle 17 is set small enough for warp yarns T to move into and out of the a shed at a high speed without damaging the warp yarns T.
  • the guide recess 14 of the dent 13 is formed with an upper wall surface 21, an inner wall surface 22 and a lower wall surface 23.
  • the guide recess 14 is further formed with an upper arcuate surface 24 connecting the upper wall surface 21 and the inner wall surface 22 and a lower arcuate surface 25 connecting the inner wall surface 22 and the lower wall surface 23.
  • the upper arcuate surface 24 is formed with a predetermined radius of curvature BR
  • the lower arcuate surface 25 is formed with a predetermined radius of curvature CR.
  • the dent 13 has an upper jaw portion 19 located above the guide recess 14.
  • the upper jaw portion 19 is defined by the upper wall surface 21, the upper arcuate surface 24, an upper front surface 26 and an upper jaw arcuate surface 27 which connects the upper wall surface 21 and the upper front surface 26.
  • the upper jaw arcuate surface 27 is formed with a predetermined radius of curvature AR.
  • the upper wall surface 21 is formed with the upper arcuate surface 24, a part of the upper jaw arcuate surface 27 and a horizontal surface extending between the upper arcuate surface 24 and the upper jaw arcuate surface 27.
  • the upper jaw portion 19 is formed extending frontward for a distance Aas indicated in Fig. 3 , which distance A is substantially the same as the distance between the inner wall surface 22 of the guide recess 14 and the front end of the upper jaw portion 19.
  • the dent 13 has a lower jaw portion 20 located below the guide recess 14.
  • the lower jaw portion 20 is defined by the lower wall surface 23, the lower arcuate surface 25, a lower front surface 28 and a lower jaw arcuate surface 29 which connects the lower wall surface 23 and the lower front surface 28. More specifically, the front end of the lower jaw portion 20 is defined by the lower jaw arcuate surface 29 formed with a predetermined radius of curvature DR.
  • the lower wall surface 23 is formed with the lower arcuate surface 25, a part of the lower jaw arcuate surface 29 and a flat wall surface ⁇ , or a wall surface without curvature, extending between the lower arcuate surface 25 and the lower jaw arcuate surface 29.
  • the flat wall surface ⁇ is inclined forwardly and downwardly at an angle of 10 degrees with respect to the horizontal. Boundaries between the inner wall surface 22 and the lower arcuate surface 25 and between the lower arcuate surface 25 and the flat wall surface ⁇ and between the flat wall surface ⁇ and the lower jaw arcuate surface 29 are shown by dotted lines in Fig. 2 , respectively.
  • the lower jaw portion 20 extends frontward for a distance B as indicated in Fig. 3 , which distance B is substantially the same as the distance between the inner wall surface 22 and the front end of the lower jaw portion 20.
  • two conditions are fulfilled, namely the first condition that the distance B is set at or lower than 5.0 millimeters (mm), the second condition that the sum of the radii of curvature CR and DR (CR+DR) is set smaller than the distance B.
  • the distance between the upper arcuate surface 24 and the injection hole 18 of the weft insertion sub-nozzle 17 should preferably be as short as possible.
  • the warp yarns T are pressed against the profile reed 11 when the weft insertion sub-nozzle 17 enters into a shed while separating the warp yarns T, with the result that a weaving defect such as nozzle mark is made on the warp yarns T.
  • the distance B needs to be shortened.
  • the weft insertion sub-nozzle 17 may be located closer to the reed dents13, so that the distance between the upper arcuate surface 24 and the injection hole 18 is shortened, and the air consumption of the weft insertion sub-nozzle 17 is reduced.
  • a part of the lower wall surface 23 is formed by the flat wall surface ⁇ , or the lower arcuate surface 25 and the lower jaw arcuate surface 29 are not connected directly, but through the flat wall surface ⁇ .
  • the provision of the flat wall surface ⁇ helps to prevent effectively air jet from the weft insertion sub-nozzle 17 from being diffused. If the dimension of the flat wall surface ⁇ as measured along the slope thereof between the lower arcuate surface 25 and the lower jaw arcuate surface 29 is insufficient, the air diffusion is not prevented sufficiently, so that the weft yarn Y tends to fly out from the weft yarn passage 15.
  • the lower wall surface 23 having the flat wall surface ⁇ is effective for preventing the weft yarn Y from flying out from the weft yarn passage 15.
  • the dent 13 thus fulfilling the second condition is advantageous in preventing failure in weft insertion over a dent formed with a guide recess having only a lower arcuate wall surface corresponding to the lower arcuate surface 25 and a lower jaw arcuate surface corresponding to the lower jaw arcuate surface 29.
  • the dent 13 of the profile reed 11 of the present embodiment fulfills the first and second conditions.
  • the dent 13 should preferably fulfill a third condition that the difference between the sum of the radii of curvature CR and DR (CR+DR) and the distance B is set at or larger than 1.5 mm.
  • the flat wall surface ⁇ of the lower wall surface 23 has a sufficient dimension along the slope of the lower wall surface 23 thereby to improve the stability of weft insertion through a shed.
  • the third condition is not fulfilled, or the difference between the distance B and the sum of the radii of curvature (B-(CR+DR)) is smaller than 1.5 mm, and the flat wall surface ⁇ has an insufficient dimension along the slope, the stability of weft insertion may be impaired and the frequency of the weft insertion failure is increased.
  • Example1 9.0 5.0 1.0 2.0 3.0 2.0 2.68
  • Example2 9.0 4.7 1.0 2.0 3.0 1.7 2.38
  • Example3 9.0 4.0 1.0 2.0 3.0 1.0 1.66
  • Table 1-2 Rotational speed (mm) Testing hours (h/m/s) Weft insertion failure (time) Weft insertion failure (time/h) Evaluation
  • Example1 900 8:15:00 0 0 Good
  • Example2 900 7:16:00 0 0 Good
  • Example3 900 8:24:00 1 0.12 Good Comparative example 900 0:01:07 5 270 Bad
  • the reed dent according to the example 1 had the distance A of 9.0 mm, the distance B of 5.0 mm, the radius of curvature CR of 1.0 mm and the radius of curvature DR of 2.0 mm.
  • the sum of the radii of the curvature (CR+DR) was 3.0 mm
  • the difference (B-(CR+DR)) between the distance B and the sum of the radii of curvature (CR+DR) was 2.0 mm
  • the dimension of the flat wall surface ⁇ of the lower wall surface was 2.68 mm.
  • the profile reed using the dents according to the example 1 thus fulfilled the conditions 1 through 3.
  • the result of operation test for the example 1 shows that the testing hours were 8 hours and 15 minutes, the number of times of weft insertion failure in the testing hours was zero, and the number of times of weft insertion failure per hour was zero (calculated value). Therefore, the result of operation test of the example 1 was evaluated as good.
  • the reed dent according to the example 2 had the distance A of 9.0 mm, the distance B of 4.7 mm, the radius of curvature CR of 1.0 mm and the radius of curvature DR of 2.0 mm.
  • the sum of the radii of the curvature (CR+DR) was 3.0 mm
  • the difference (B-(CR+DR)) between the distance B and the sum of the radii of curvature (CR+DR) was 1.7 mm
  • the dimension of the flat wall surface ⁇ of the lower wall surface was 2.38 mm.
  • the profile reed using dents according to the example 2 thus fulfilled the conditions 1 through 3.
  • the result of operation test for the example 2 shows that the testing hours were 7 hours and 16 minutes, the number of times of weft insertion failure in the testing hours was zero, and the number of times of weft insertion failure per hour was zero (calculated value). Therefore, the result of operation test of the example 2 was evaluated as good.
  • the reed dent according to the example 3 had the distance Aof 9.0 mm, the distance B of 4.0 mm, the radius of curvature CR of 1.0 mm and the radius of curvature DR of 2.0 mm.
  • the sum of the radii of the curvature (CR+DR) was 3.0 mm
  • the difference (B-(CR+DR)) between the distance B and the sum of the radii of curvature (CR+DR) was 1.0 mm
  • the dimension of the flat wall surface ⁇ of the lower inner surface was 1.66 mm.
  • the profile reed using the dents according to the example 3 thus fulfilled the conditions 1 and 2.
  • the result of operation test for the example 3 shows the testing hours were 8 hours and 24 minutes, the number of times of weft insertion failure in the testing hours were one, and the number of times of weft insertion failure per hour was 0.12 (calculated value). According to the example 3, there was the weft insertion failure, but the failing frequency of weft insertion is acceptable for practical use. Therefore, the result of operation test of the example 3 was evaluated as good.
  • the reed dent according to the comparative example had the distance A of 9.0 mm, the distance B of 4.0 mm, the radius of curvature CR of 2.0 mm and the radius of curvature DR of 2.5 mm.
  • the sum of the radii of the curvature (CR+DR) was 4.5 mm
  • the difference (B-(CR+DR)) between the distance B and the sum of the radii of curvature (CR+DR) was minus 0.5 mm
  • the dimension of the flat wall surface ⁇ of the lower wall surface was 0.45 mm.
  • the profile reed using the dents according to comparative example thus fulfilled only the condition 1, but failed to fulfill the conditions 2 and 3.
  • the result of operation test for the comparative example shows the testing hours were 1 minute and 7 seconds, the number of times of weft insertion failure in the testing hours was five, and the number of times of weft insertion failure per hours was 270 (calculated value).
  • the frequency of the weft insertion failure is not acceptable for practical use. Therefore, the result of operation test of the comparative example was evaluated as bad.
  • the preferred embodiment offers the following advantageous effects.
  • a profile reed for an air jet loom includes a dent having a guide recess and a lower jaw portion located below the guide recess, and a weft yarn passage formed by a plurality of the dents juxtaposed in the direction of weft insertion.
  • the guide recess is formed with upper, inner lower wall surfaces.
  • the inner wall surface is connected with the lower wall surface through a lower arcuate surface formed with a radius of curvature.
  • the front end of the lower jaw portion is defined by a lower jaw arcuate surface formed with a radius of curvature.
  • the lower jaw portion extends frontward for a distance between the inner wall surface and the front end of the lower jaw portion. The distance is set at or lower than 5.0 millimeters. The sum of the radii of curvature is smaller than the distance.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20110189875 2010-11-23 2011-11-21 Luftdüsenwebmaschine mit profiliertem Riet Active EP2455520B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010260697A JP5573629B2 (ja) 2010-11-23 2010-11-23 エアジェットルームの変形筬

Publications (3)

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EP2455520A2 true EP2455520A2 (de) 2012-05-23
EP2455520A3 EP2455520A3 (de) 2012-09-05
EP2455520B1 EP2455520B1 (de) 2013-07-31

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EP (1) EP2455520B1 (de)
JP (1) JP5573629B2 (de)
CN (1) CN102534954B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20150706A1 (it) * 2015-05-26 2016-11-26 Itema Spa Pettine per telai di tessitura ad aria

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5991159B2 (ja) * 2012-11-16 2016-09-14 株式会社豊田自動織機 エアジェット織機におけるサブノズルの配列選択装置
CN103161003A (zh) * 2013-03-27 2013-06-19 吴江市金平华纺织有限公司 一种夹持式异形筘
CN103696100A (zh) * 2013-12-05 2014-04-02 建滔（清远）玻璃纤维有限公司 一种喷气织机降压节气机构

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0874143A (ja) 1994-07-05 1996-03-19 Toyota Central Res & Dev Lab Inc エアジェットルーム用の変形筬

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0759773B2 (ja) * 1986-04-17 1995-06-28 株式会社豊田自動織機製作所 タオル用ジェットルームにおける緯入れ案内装置
JPH02160949A (ja) * 1988-12-09 1990-06-20 Asahi Chem Ind Co Ltd エアージェットルーム
JPH08144157A (ja) * 1994-11-15 1996-06-04 Toyota Autom Loom Works Ltd エアジェットルーム用筬
JP3357278B2 (ja) * 1997-11-10 2002-12-16 株式会社豊田中央研究所 エアジェットルーム用の変形筬
JP2003049346A (ja) * 2001-08-08 2003-02-21 Takayama Reed Co Ltd 空気噴射織機用筬及び筬羽
JP3961318B2 (ja) * 2002-03-14 2007-08-22 株式会社豊田中央研究所 エアジェットルーム用の変形筬
CN100500964C (zh) * 2003-01-16 2009-06-17 津田驹工业株式会社 空气喷射式织布机用筘
CN1328432C (zh) * 2003-01-29 2007-07-25 津田驹工业株式会社 空气喷射式织机用筘

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0874143A (ja) 1994-07-05 1996-03-19 Toyota Central Res & Dev Lab Inc エアジェットルーム用の変形筬

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20150706A1 (it) * 2015-05-26 2016-11-26 Itema Spa Pettine per telai di tessitura ad aria
EP3098338A2 (de) 2015-05-26 2016-11-30 ITEMA S.p.A. Webblatt für luftdüsenwebmaschinen
EP3098338A3 (de) * 2015-05-26 2017-01-11 ITEMA S.p.A. Webblatt für luftdüsenwebmaschinen

Also Published As

Publication number Publication date
CN102534954A (zh) 2012-07-04
JP5573629B2 (ja) 2014-08-20
EP2455520A3 (de) 2012-09-05
CN102534954B (zh) 2014-12-24
EP2455520B1 (de) 2013-07-31
JP2012112061A (ja) 2012-06-14

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