EP1408144A2 - Dispositif de tension de fil de trame d'un métier à tisser - Google Patents

Dispositif de tension de fil de trame d'un métier à tisser Download PDF

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Publication number
EP1408144A2
EP1408144A2 EP03019991A EP03019991A EP1408144A2 EP 1408144 A2 EP1408144 A2 EP 1408144A2 EP 03019991 A EP03019991 A EP 03019991A EP 03019991 A EP03019991 A EP 03019991A EP 1408144 A2 EP1408144 A2 EP 1408144A2
Authority
EP
European Patent Office
Prior art keywords
weft
inducing pipeline
reed
tension device
pipeline
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Withdrawn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
EP03019991A
Other languages
German (de)
English (en)
Other versions
EP1408144A3 (fr
Inventor
Norio Minamitani
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 EP1408144A2 publication Critical patent/EP1408144A2/fr
Publication of EP1408144A3 publication Critical patent/EP1408144A3/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Withdrawn legal-status Critical Current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
    • D03D47/28—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

Definitions

  • a weft tension device to have, in addition to a function to capture a non-weft-supply side weft end so as to apply a tension to the weft, a function to discharge the non-weft-supply side weft end.
  • the weft end on the non-supply side of the inserted weft is displaced within the weft capturing pipe by the air jetted from the stretch nozzle.
  • the captured weft end is thereafter drawn out of the weft capturing pipe by the air jetted from the excluding nozzle from the side of the weft capturing pipe toward the side of the non-capturing pipe.
  • An object of the present inventions lies in readily removing a captured weft end without using a weft exclusion nozzle.
  • the weft tension device comprises: a stretch nozzle disposed on a non-weft-supply side so as to jet a fluid toward a weft running path: a penetrated weft inducing pipeline having a weft introducing end opposite to a fluid port of the stretch nozzle so as to introduce the weft end by the fluid jetting operation of the stretch nozzle; and blocking means for blocking the non-weft-introducing end side of the weft inducing pipeline during at least a part of a period from the introduction of the weft end to the introduction of the weft end of the following pick into the weft inducing pipeline.
  • the stretch nozzle performs a fluid jet motion performed when the blocking of the weft inducing pipeline by at least the blocking means.
  • the fluid jet motion from the stretch nozzle for holding the weft is started at least before or after the weft reaches the non-weft-supply side (non-weft-insert side).
  • the non-weft-inducing end side of the weft inducing pipeline is open, so that the ejected fluid passes through the weft inducing pipeline from the weft introducing end side to the non-weft-introducing end side. Thereby, the weft end is drawn into the weft inducing pipeline and captured.
  • the non-weft-inducing end side of the weft inducing pipeline is blocked, and when the fluid is jetted from the stretch nozzle, the weft inducing pipeline is filled with the fluid, which overflows out of the pipeline, and by this overflowed fluid, the weft end captured inside the weft inducing pipeline is discharged from the weft inducing end.
  • the weft end which has been captured can be easily discharged from the weft inducing pipeline at every weft insert pick. Also, since there is no need to provide the weft tension device without a discharge function with a valve for a jet nozzle for discharging the fluid except adding blocking means, the structure is simple and the device is inexpensive.
  • the fluid jet motion performed when the weft inducing pipeline is blocked may be done to meet a timing for discharging the weft from the weft inducing pipeline. It is also possible to utilize the residual pressure of the jetting during the period of tension applying instead of jetting for discharge.
  • the weft inducing pipeline is connected to the reed so as to move together with the reed
  • the blocking means can include a shield body which can move together with the reed and, as well as a drive mechanism for moving the shield body and disposed in the loom.
  • the blocking means may block the non-weft-inducing end side during at least a part of the period other than the period for applying the tension to the weft.
  • the fluid jet port of the stretch nozzle and the weft introducing end of the weft inducing pipeline may confront each other with the weft running path interposed.
  • the fluid jet port of the stretch nozzle and the weft introducing end of the weft inducing pipeline may oppose each other with a weft guide groove of a dent portion of the reed interposed or may oppose with the weft running path of the non-supply side rather than the reed interposed.
  • the blocking means can be provided with an elastic body to be elastically deformed when the non-weft-introducing end side is blocked.
  • the elastic body is elastically deformed to block the non-weft-introducing end side, so that adhesion between the non-weft-introducing end side of the weft inducing pipeline and the blocking means becomes high, and there is no risk that the air within the weft inducing pipeline might leak, and the discharging force of the weft end becomes stronger.
  • a weft tension device 10 is applied to an air jet loom for inserting a weft 12 which is run within a weft guide groove 16 of a reed 14 by a main nozzle and a plurality of sub nozzles.
  • the reed 14 has a plurality of dents 18 extending in the upward and downward at intervals in the cloth width direction, and the guide groove 16 is directed toward the cloth fell.
  • the weft tension device 10 is disposed on a non-weft-supply side so as to capture a weft end 12a on the non-weft-supply side (non-weft-insert side) in order to apply tension to the inserted weft 12 and thereafter to discharge the weft end 12a.
  • the weft tension device 10 comprises: a stretch nozzle 20 disposed on the non-weft-supply side so as to jet the compressed air toward the running path of the weft 12; the weft inducing pipeline 22 penetrated so as to introduce the weft end 12a by fluid jetting motion of the stretch nozzle 20; a shield body 24 for opening and closing the non-weft-introducing end side of the weft inducing pipeline 22; and an opening and closing valve 28 for supplying the compressed air of the compressed air source 26 to the stretch nozzle 20.
  • the stretch nozzle 20 is disposed in a suitable member such as a lead sley so that the compressed air from a fluid jet port 30 can pass across a portion of the weft guide groove 16 and pass through between the dents 18 on the non-weft-supply side from the cloth side to the non-cloth side.
  • the stretch nozzle 20 is moved together with the reed 14.
  • the weft inducing pipeline 22 shaped like a pipe bent substantially like an L-letter, makes one end oppose to the fluid jet port 30 as a weft introducing end at the weft inlet port.
  • the weft inducing pipeline 22 is also disposed in a suitable member such as a lead sley and connected to the reed 14 so as to move together with the reed 14.
  • the shield body 24 is shaped like a shield plate supported on a frame 32 of the loom so as to block the other side (non-weft-introducing end) of the weft inducing pipeline 22 when the reed 14 is moved to the most backward position.
  • the compressed air source 26 has a compressor, a tank for storing the compressed air, and a pressure regulation valve for supplying the compressed air from the tank to an opening and closing valve 28 by regulating the compressed air to a predetermined pressure.
  • the opening and closing valve 28 is opened or closed at a predetermined timing by a control unit 34.
  • the control unit 34 releases the opening and closing valve 28 in a period to apply tension to the weft 12 and in a period to discharge the weft ends 12a within the weft inducing pipeline 22 on the basis of a rotation angle signal from an encoder 38 which generates a signal representing a rotation angle of a main shaft 36.
  • the opening timing of the opening and closing valve 28 can be a period from 220° to 340° and a period before and after 180° in accordance with the rotation angle ⁇ of the main shaft 36, as shown in Fig. 2 as the air jet timing.
  • the non-weft-introducing end side of the weft inducing pipeline 22 is, as shown in Fig. 2 as the shield timing, blocked substantially at the same time as the jet timing for discharging the weft end.
  • the weft 12 at this time is applied tension and beaten when the main shaft 36 is at 0° (360°). Then, insertion of the next weft 12 is started.
  • the trimmed selvedge length of the weft 12 inserted this time is longer than the reed sley stroke, it sometimes happens that the weft end 12a is not discharged from the weft inducing pipeline 22.
  • the weft end 12a of the weft 12 inserted this time is discharged from the weft inducing pipeline 22 at the time of the next weft insertion and before the weft end 12a of the weft 12 that time is introduced into the weft inducing pipeline 22.
  • the weft end 12a which has been captured can be readily discharged from the weft inducing pipeline 22 at each weft insert pick. Also, only blocking means including the shield body 24 is added to a weft tension device which has no discharging function so as to synchronize with the loom by utilizing the swinging motion of the reed 14, and since there is no need to have a fluid jet nozzle for discharge or a valve therefore, the structure is simple, and the device is inexpensive.
  • the stretch nozzle 20 is disposed adjacent to the non-supply side of the reed 14 with the fluid nozzle directed upward so as to jet the air from the lower part toward the upper part, and is attached to a reed sley 44 by means of an L-shaped bracket 42.
  • the bracket 42 also directs the weft guide groove 16 toward the cloth fell at a position in the weaving width direction of the weft guide groove 16 of the reed 14.
  • a yarn sensor 46 is attached to the reed sley 44, to detect that the weft 12 is at a predetermined position of the non-supply side.
  • the weft inducing pipeline 22 is attached to the upper part of the bracket 42 such that, in order to receive the air and the weft end 12a jetted upward from the weft inducing end (finally, the weft inlet port) side, the weft introducing end side opposes to the fluid jet port of the stretch nozzle 20.
  • the shield body 24 is attached to a bracket 50 which supports a temple cover 48, so as to block the non-weft-introducing end side of the weft inducing pipeline 22 when the reed 14 moved to the most advanced position.
  • the temple cover 48 is a publicly known one which is attached to the frame 32 of the loom by the bracket 50 so as to cover a temple 52 which maintains the weaving width.
  • the jet timing from the stretch nozzle 20 is set at a period ⁇ 1 which includes a period for applying the tension to the weft 12 and an allowance, and at a period ⁇ 2 for discharging the weft end. It is also possible to set the period ⁇ 1 and the period ⁇ 2 not in sequence but individually.
  • the jet timing can be, as shown in Fig. 4 as the jet timing, a period from 220° to 360° in accordance with the rotation angle ⁇ of the main shaft 36.
  • the jet timing can be, as shown in Fig. 4 as the jet timing, a period from 220° to 360° in accordance with the rotation angle ⁇ of the main shaft 36.
  • the weft introducing end side of the weft inducing pipeline 22 is, as shown in Fig. 4 as the shield timing, blocked substantially at the same time as the jet timing for discharging the weft end.
  • the air is jetted from the stretch nozzle 20 while the reed 14 is advanced from the most backward position and the weft end 12a of the inserted weft 12 is reaching the vicinity of the non-supply side.
  • the air from the stretch nozzle 20 passes the weft inducing pipeline 22.
  • the weft end 12a of the weft 12 inserted this time is captured by the weft inducing pipeline 22. In this state, the tension is applied to the weft 12 at this time.
  • the non-introducing end side of the weft inducing pipeline 22 is blocked by the shield body 24.
  • the air is jetted from the stretch nozzle 20 until the weft 12 is beaten, the air is overflowed out of the weft inducing pipeline 22 like the weft tension device 10, the weft end 12a captured in the weft inducing pipeline 22 is discharged from the weft introducing end of the weft inducing pipeline 22 by the overflowing air.
  • the weft end 12a of the weft 12 inserted this time is discharged from the weft inducing pipeline 22 before the next weft is inserted.
  • the weft tension device 40 also enables to give an action and effect similar to that of the weft tension device 10.
  • the weft tension device may have a blocking body for blocking the non-introducing end side of the weft inducing pipeline 22 when the reed 14 moved to the most backward position, and a blocking body for blocking the non-introducing end side of the weft inducing pipeline 22 when the reed 14 moved to the most advanced position.
  • the jetting direction of the stretch nozzle 20 may be any directions, whether vertically or horizontally.
  • the non-introducing end side of the weft inducing pipeline 22 is blocked with the beating motion of the reed 14, but it is possible to have the non-introducing end of the weft inducing pipeline 22 blocked by moving the shield body 24 forcibly by means of a specific drive mechanism with a drive source such as an actuator or with the main shaft as a drive source.
  • a weft tension device 60 shown in Fig. 5 blocks the non-introducing end side of the weft inducing pipeline 22 by forcibly reciprocating the shield body 24 by a drive mechanism 62 within a plane orthogonal to the axis of the non-introducing end side of the weft inducing pipeline 22.
  • the drive mechanism 62 has a drive source.
  • a weft tension device 70 shown in Fig. 6 blocks the non-introducing end side of the weft inducing pipeline 22 by forcibly reciprocating the shield body 24 by a drive mechanism 72 in the axial direction of the non-introducing end side of the weft inducing pipeline 22.
  • the drive mechanism 72 has a drive source.
  • a weft tension device 80 shown in Fig. 7 blocks the non-introducing end side of the weft inducing pipeline 22 by forcibly swinging the shield body 24 to an opening position and a blocking position within a plane orthogonal to the non-introducing end side of the weft inducing pipeline 22.
  • the drive mechanism 82 has a drive source.
  • the drive mechanisms 62, 72 and 82 are reciprocated respectively at a predetermined timing in accordance with the rotational angles of the main shaft 36 by means of the control units 64, 74 and 84.
  • the control units 64, 74 and 84 supply signals for moving the shield body 24 to the drive mechanisms 62, 72 and 82 respectively on the basis of the rotation angle signal from the encoder 38 for generating the signal representing the rotation angle of the main shaft 36.
  • the timing for blocking the non-introducing end side of the weft inducing pipeline 22 may be a part of the period from when the non-supply side weft end 12a of the inserted weft 12 is introduced into the weft inducing pipeline 22 until the weft end 12a of the next pick is introduced into the weft inducing pipeline 22, as in case the reed 14 reached the vicinity of the most backward position or the most advanced position like the weft tension devices 10 and 40.
  • the weft tension device 90 uses a shield body 96 which uses a cylindrical leaf spring 92 having a cross-section such as elliptical, circular or the like with a rubber sheet 94 mounted thereon.
  • the shield body 96 is attached to the frame 32 of the loom so that, when the reed sley 44 is moved to the most backward position or the most advanced position, the non-introducing end side of the weft inducing pipeline 22 may be blocked with the rubber sheet 94.
  • Fig. 8 shows the state when the reed sley 44 is moved to the most advanced position.
  • the leaf spring 92 and the rubber sheet 94 are elastically deformable, so that, when the shield body 96 is pressed against the non-introducing end side of the weft inducing pipeline 22 by the movement of the reed sley 44, the shield body 96 is elastically deformed and blocks the non-introducing end side of the weft inducing pipeline 22 with the rubber sheet 94. Consequently, adhesion between the non-introducing end side of the weft inducing pipeline 22 and the shield body 96 is raised, and there is no fear for the air inside the weft inducing pipeline 22 to leak from the non-introducing end side, which raises the discharging force of the weft end 12a.
  • the timing for blocking the non-introducing end side of the weft inducing pipeline 22 is set as a part of the period from when the non-supply side weft end 12a of the inserted weft 12 is introduced into the weft inducing pipeline 22 until the weft end 12a of the next pick is introduced into the weft inducing pipeline 22, but it may be the entire period except a period for applying the tension to the weft 12.
  • the timing for blocking the non-introducing end side of the weft inducing pipeline 22 may be at least a part of the entire period except the period for applying the tension to the weft 12.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP03019991A 2002-10-10 2003-09-03 Dispositif de tension de fil de trame d'un métier à tisser Withdrawn EP1408144A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002297438 2002-10-10
JP2002297438 2002-10-10

Publications (2)

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EP1408144A2 true EP1408144A2 (fr) 2004-04-14
EP1408144A3 EP1408144A3 (fr) 2004-12-22

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EP03019991A Withdrawn EP1408144A3 (fr) 2002-10-10 2003-09-03 Dispositif de tension de fil de trame d'un métier à tisser

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2545218A (en) * 2015-12-09 2017-06-14 Griffith Textile Mach Ltd Improvements in or relating to weaving looms

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493847A1 (fr) * 1991-01-04 1992-07-08 Picanol N.V. Dispositif pour tendre le fil de trame dans un métier à tisser
EP0942082A2 (fr) * 1998-03-09 1999-09-15 Lindauer Dornier Gesellschaft M.B.H Dispositif de tension et de détection de la trame pour métiers à tisser à jet d'air
JP2000154441A (ja) * 1998-11-17 2000-06-06 Toyota Autom Loom Works Ltd ジェットルームにおける緯糸張力付与装置
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493847A1 (fr) * 1991-01-04 1992-07-08 Picanol N.V. Dispositif pour tendre le fil de trame dans un métier à tisser
EP0942082A2 (fr) * 1998-03-09 1999-09-15 Lindauer Dornier Gesellschaft M.B.H Dispositif de tension et de détection de la trame pour métiers à tisser à jet d'air
JP2000154441A (ja) * 1998-11-17 2000-06-06 Toyota Autom Loom Works Ltd ジェットルームにおける緯糸張力付与装置
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

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 09, 13 October 2000 (2000-10-13) & JP 2000 154441 A (TOYOTA AUTOM LOOM WORKS LTD), 6 June 2000 (2000-06-06) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 09, 13 October 2000 (2000-10-13) & JP 2000 170057 A (TOYOTA AUTOM LOOM WORKS LTD), 20 June 2000 (2000-06-20) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2545218A (en) * 2015-12-09 2017-06-14 Griffith Textile Mach Ltd Improvements in or relating to weaving looms

Also Published As

Publication number Publication date
EP1408144A3 (fr) 2004-12-22

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