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EP0572350A1 - Méthode pour empêcher une marque d'arrêt dans un métier à tisser à air - Google Patents

Méthode pour empêcher une marque d'arrêt dans un métier à tisser à air Download PDF

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Publication number
EP0572350A1
EP0572350A1 EP93810334A EP93810334A EP0572350A1 EP 0572350 A1 EP0572350 A1 EP 0572350A1 EP 93810334 A EP93810334 A EP 93810334A EP 93810334 A EP93810334 A EP 93810334A EP 0572350 A1 EP0572350 A1 EP 0572350A1
Authority
EP
European Patent Office
Prior art keywords
weft
loom
arrival
detectors
detected
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Withdrawn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
EP93810334A
Other languages
German (de)
English (en)
Inventor
Masami C/O Kabushiki Kaisha Toyoda Shinbara
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
Toyoda Jidoshokki Seisakusho KK
Toyoda Automatic Loom Works 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 Toyoda Jidoshokki Seisakusho KK, Toyoda Automatic Loom Works Ltd filed Critical Toyoda Jidoshokki Seisakusho KK
Publication of EP0572350A1 publication Critical patent/EP0572350A1/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Withdrawn legal-status Critical Current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
    • D03D47/3073—Detection means therefor
    • 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
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/002—Avoiding starting marks
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • the present invention relates to a method of preventing formation of a stop streak on a fabric in a jet loom.
  • weft fails to be inserted properly throughout a warp shed in a jet loom, it may be detected by a weft detector located at the downstream end of weft flying passage beyond the weaving width of the loom and adapted to detect the leading end of each inserted weft.
  • weft insertion may be monitored by use of a plurality of weft detectors arranged within the range of weaving width of a jet loom along weft flying passage, as disclosed by Publications of unexamined Japanese patent applications 55-142750 (1980), 58-36242 (191983) and 62-250248 (1987).
  • a failure in weft insertion is recognized when a weft-detected signal fails to be generated by a weft detector in a predetermined time after its preceding weft detector has detected an inserted weft.
  • each auxiliary nozzle is a activated at a time when the air jetting zone of that auxiliary nozzle is anticipated to be reached by the leading end of an inserted weft, on the basis of the time at which the leading end has been detected by a weft detector located immediately upstream of the auxiliary nozzle. That is, if the leading end of an inserted weft fails to be detected by a weft detector even after elapse of an anticipated time as measured after its preceding weft detector has detected the weft, a signal is generated which is indicative of a failure in proper weft insertion.
  • the apparatuses according to Publications 58-36242 and 62-250248 equipped with plural weft detectors arranged within the weaving width may detect a failure in weft insertion earlier than an apparatus having a weft detector located at the downstream end of weft flying passage beyond the weaving width.
  • the loom is stopped at a predetermined crank angle on the basis of the time at which the weft insertion failure is detected by the weft detector at the extremity end beyond the weaving width.
  • the faulty weft is inevitably beaten by the reed against the cloth fell and formation of a stop streak could not be prevented by these apparatuses.
  • the first embodiment of the invention provides a method comprising detecting the leading end of an inserted weft by means of a plurality of weft arrival detectors arranged within the range of weaving width of the jet loom and causing the loom to be stopped if any weft arrival times detected by the weft arrival detectors are later than the latest permissible arrival times established for the respective weft arrival detectors, said causing the loom to be stopped being effected immediately in response to the earliest detected time of said detected weft arrival times.
  • the second embodiment of the invention provides a method comprising detecting the leading end of an inserted weft by means of the above plurality of weft arrival detectors and causing the loom to be stopped immediately if weft arrival times detected by the weft arrival detectors shows a specific tendency in progressive delay of weft arrival times with reference to the latest permissible arrival times established for the respective weft arrival detectors.
  • the third embodiment of the invention provides a method comprising detecting the leading end of an inserted weft by means of the above plurality of weft arrival detectors and causing the loom to be stopped and substantially simultaneously causing the cloth fell of woven fabric to be shifted away from the weft beat-up position a reed of the loom if any weft arrival times detected by the weft arrival detectors are later than the latest permissible arrival times set for the respective weft arrival detectors said causing the loom to be stopped and the cloth fell to be shifted being effected immediately in response to the earliest detected time of said detected weft arrival times.
  • the loom driving motor is stopped and braked immediately in response to a delayed weft arrival detected by a weft arrival detector.
  • This can bring the loom to a complete stop after rotation by inertia before the beat-up position reached by the reed, so that the faulty weft will not be beaten against the cloth fell during the rotation of the loom by inertia. Therefore, a stop stream resulting from beating the faulty weft against the cloth fell can be prevented successfully.
  • the loom drive motor is stopped and braked immediately upon recognition of a tendency of the weft arrival times detected by the weft arrival detectors being delayed at such a rate that a failure in weft insertion will eventually occur.
  • reference symbol M designates a loom drive Motor the operation of which is controlled by a control computer C.
  • the motor M has a brake B.
  • Reference numeral 1 designates a reversible let-off motor provided independently of the loom drive motor M for driving a warp beam 2.
  • Warp yarns T unwound from the warp beam 2 are guided toward healds 5 and a reed 6 through a back roller 3 and a tension roller 4.
  • Woven fabric W guided is guided by an expansion bar 7, a surface roller 8 operatively connected to the motor M, a press roller 9 and a stretching guide 10 and then wound up by a cloth roller 11.
  • the tension roller 4 is mounted to one end of a tension lever 12 which has at the other end thereof a spring 13 acting to urge the tension roller 4 in pressing contact with the warp yarns T thereby applying tension thereto.
  • the tension lever 12 is rotatably supported by one end of a detecting lever 14 whose other end is connected to a load cell 15. In such an arrangement, the warp tension is transmitted to the load cell 15 through the tension roller 4, tension lever 12 and detecting lever 14, thereby causing the load cell 14 to generate to the control computer C an electrical signal representative of the current magnitude of warp tension being applied to the tension roller 4.
  • the control computer C is operatively connected to the warp let-off motor 1 to control its rotational speed according to comparison between warp tension setting and the actual warp tension that is represented by the output electrical signal from the load cell 15 and also to the current warp beam diameter which can be monitored by a rotary encoder 16 for detecting the angle of rotation of the loom.
  • the warp tension is adjusted properly during normal weaving operation by controlling the rotational speed of the motor 1 and weaving defects such as weaving bar can be prevented from being formed in the woven fabric W.
  • the control computer C is connected to a start control switch 17 which, when energized, generates an ON signal to the control computer which, then responding to such signal, transmits a forward rotation command signal to the motor M through an inverted I and a forward rotation command signal to the let-off motor 1.
  • the control computer C provides a feed-back control for controlling the rotational speed of the let-off motor 1 from detection signals transmitted from a rotary encoder 1a incorporated in the motor 1.
  • reference numeral 18 designates a weft measuring and storage device of known winding type.
  • a predetermined length of weft Y measured and stored by the device 18 is inserted into a warp shed by an air jet issued from a weft inserting main nozzle 19.
  • the inserted weft Y is assisted in flying through the shed by air jets issued from pairs of auxiliary nozzles 20, 21, 22, 23 for accelerating the weft.
  • These auxiliary nozzles 20-23 are arranged within the range of weaving width of the loom.
  • weft detectors S1, S2 of optical reflection type located at predetermined positions at the downstream end of the weft flying passage remote from the weft inserting main nozzle 19 and beyond the range of weaving width of the loom for detecting the leading end of each inserted weft and generating to the control computer C signals representing presence or absence of the weft.
  • the weft measuring and storage device 18 has a stop pin 24a which is driven by a solenoid 24 to be engaged with a weft winding surface 18a of the device 18 for winding and storage of the predetermined length of weft Y and to be disengaged therefrom for releasing the same weft. Operation of the solenoid 24 is controlled from a command signal transmitted by the control computer C according to the information of angle of rotation of the loom.
  • a weft detector 25 of optical reflection type Adjacent the weft winding surface 18a is provided a weft detector 25 of optical reflection type for detecting a weft being released from the weft winding surface 18a.
  • the control computer C deenergizes the solenoid 24 when the number of detections by the weft detector 25 becomes a predetermined number setting, thereby moving the stop pin 24 into engagement with the weft winding surface 18a to stop weft releasing therefrom.
  • Injection of air jet from the weft inserting main nozzle 19 is controlled by a solenoid-operated valve V1, while injection of air jets from the pairs of auxiliary nozzles 20-23 is controlled by similar solenoid-operated valves V2, V3, V4, V5, respectively.
  • the valve V1 is connected to an air tank 26 for holding therein air under pressure and supplying the air to the valve.
  • the valves V2-V4 are connected to a common air tank 11 for holding therein air under pressure and supplying the air to the respective valves.
  • the valve V5 is connected to a separate air tank 28 for holding therein air under pressure and supplying the air to the valve.
  • valves V1-V5 are operated to open or close their associated valves according to a command from the control computer C which provides such command in response to information of the current angle of rotation of the weaving loom being monitored by the rotary encoder 16. In normal operation, the valves V1-V5 are activated successively starting with the first valve V1.
  • weft detectors F1, F2, F3, F4, F5, F6, F7 of optical reflection type are provided between any paired auxiliary nozzles and also between any two adjacent pairs of such nozzles.
  • a known device 29 for disposing of a faulty weft Located above the main weft inserting nozzle 19 is provided a known device 29 for disposing of a faulty weft.
  • This device 29 which is disclosed, e.g. by Publication of unexamined Japanese patent application 2-61138 (1990), functions to prevent insertion of a weft in the event of occurrence of failure in proper insertion of its preceding weft and then to remove a resulting faulty weft on the cloth fell W1 of the woven fabric W with the aid of the weft succeeding the faulty weft.
  • operation of the former device is controlled by the latter.
  • FIGS. 5 and 6 provide flow charts showing a program according to which the above-described apparatus operates to prevent formation of stop streak.
  • the same detector As the leading end of a weft Y ejected through the weft inserting main nozzle 19 reaches the detector F1 to be detected thereby, the same detector generates a weft-arrival signal to the control computer C. If the time of signal generation, hence the time at which the weft has arrived at the detector F1, is at or earlier than the latest permissible arrival time T1 set for that detector, the control computer C monitors whether or not the weft-arrival signal generation by the next detector F2 takes place at or earlier than the latest permissible arrival time T2 for the detector F2.
  • the control computer C commands the loom drive motor M and the let-off motor 1 to stop and application of the brake B thereby to cause the loom to stop at a given crank angle. If both of the detectors S1, S2 detect the weft, the control computer provides the same command as in the above case so that the loom is caused to stop at the given crank angle.
  • the failure in weft insertion in the latter case can be considered to be caused by a cut-off in the inserted weft.
  • the control computer C commands a stop of the loom drive motor M and application of the brake B in response to the firstly detected delayed arrival. If the signal of such firstly detected delay is generated by any one of the detectors F4-F7, the control computer C also commands the let-off motor 1. to be accelerated for a predetermined length of time before it is stopped. This acceleration of the motor 1 allows the warp yarns T to be unwound faster than normal rate and, therefore, the cloth fell W1 of the woven fabric W is shifted away from the beat-up position of the reed 6. On the other hand, if the signal of the above firstly detected delay is generated by any one of the detectors F1-F3, the control computer C commands the let-off motor 1 to be stopped without being accelerated.
  • the device 29 is operated to prevent a weft succeeding the faulty weft Y1 from being inserted. Then, the motors M and 1 are rotated reverse and a maximum opening of a warp shed is formed. In this position, the faulty weft Y1 at the cloth fell W1 is released from the grip by upper and lower warp sheets T and then pulled out from the cloth fell W1 by the aid of its succeeding weft portion in a known manner.
  • the reed 6 can stop before making a beat-up in case when the delayed weft arrival is detected by any one of the detectors F1-F3, formation of the above stop streak in the resulting woven fabric can be prevented.
  • the cloth fell W1 is shifted or retracted away from the beat-up position of the reed 6 simultaneously with stopping of the loom operation so as to reduce the influence of the beating-up by the reed 6. This shifting of the cloth fell W1 can effectively prevent the woven fabric from having a defective stop streak.
  • shifting of the cloth fell W1 is not effected when the delayed weft arrival is detected by the first to third detectors F1-F3, but it is noted that the cloth fell shifting may be effected in response to a delayed weft arrival detected by the second detector F2 or the third detector F3, or even by the first detector F1.
  • the main motor M and the let-off motor 1 are started to rotate forward synchronously to resume the weaving operation of the loom.
  • H m is a constant, or a value of ratio of the delay at a given weft arrival detector F m to the delay at the detector F m-1 that precedes F m .
  • the points P m-1 , P m , P m+1 represent the latest permissible arrival time T m-1 , T m , T m+1 of the weft arrival detectors F m-1 , F m , F m+1 , respectively;
  • the points Q m-1 , Q m , Q m+1 represent the weft arrival times t m-1 , t m , t m+1 actually detected by the detectors F m-1 , F m F m+1 , respectively.
  • (T m - t m ) and (T m-1 - t m-1 ) in the above equation (1) represent the distances corresponding to the time differences between the points Pm and Q m , and the points P m-1 and Q m-1 , respectively.
  • the ratio of the distance (T m - t m ) to the distance (T m-1 - t m-1 ), as expressed in the above equation (1) is smaller than a given value, an extension from the line L connecting the points Q m-1 and Q m will pass below the point P m-1 as shown in the graph.
  • the constant H m in the equation (1) is defined as the above-mentioned given value. As seen from the graph in FIG.
  • a weft Y ejected from a weft inserting main nozzle 19 is assisted by air jets issued from a plurality of auxiliary nozzles 20-23 in flying throughout a warp shed.
  • a plurality of weft arrival detectors F1-F7 are arranged at spaced intervals between any paired auxiliary nozzles and also between any two adjacent pairs of such nozzles. If a control computer C fails to receive a weft arrival signal from any of the weft arrival detectors F1-F7 later than the latest permissible arrival time, it causes a loom drive motor M to be stopped immediately with simultaneous application of brake B.
  • the first embodiment of the invention according to which the loom operation is stopped immediately in response to the earliest detected time of delayed weft arrival times detected by the weft arrival detectors, can provide an effect in that beat-up of a faulty weft by the reed against the cloth fell can be avoided, thereby preventing a stop streak.
  • the second embodiment of the invention it is possible to predict an impermissible delay of weft arrival time at a weft detector before it actually detects the leading end of the weft by monitoring the tendency of delay in weft arrival time. Therefore, a loom stop can be effected early enough to prevent a stop streak on the woven fabric.
  • the third embodiment of the invention according to which the cloth fell is retracted away from the beat-up position of the reed, as well as the loom is stopped, is effective in such a case that beat-up of a faulty weft cannot be avoided merely by stopping the loom operation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP93810334A 1992-05-08 1993-05-06 Méthode pour empêcher une marque d'arrêt dans un métier à tisser à air Withdrawn EP0572350A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11637092A JP3170863B2 (ja) 1992-05-08 1992-05-08 ジェットルームにおける止段防止方法
JP116370/92 1992-05-08

Publications (1)

Publication Number Publication Date
EP0572350A1 true EP0572350A1 (fr) 1993-12-01

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EP93810334A Withdrawn EP0572350A1 (fr) 1992-05-08 1993-05-06 Méthode pour empêcher une marque d'arrêt dans un métier à tisser à air

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EP (1) EP0572350A1 (fr)
JP (1) JP3170863B2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0743384A3 (fr) * 1995-05-17 1997-09-24 Toyoda Automatic Loom Works Procédé et appareil pour la commande de l'utilisation d'air comprimé dans un métier à jet d'air
CN105420895A (zh) * 2015-12-30 2016-03-23 吴江万工机电设备有限公司 一种筘槽内核心气流测量装置
EP3348688A1 (fr) * 2017-01-13 2018-07-18 Kabushiki Kaisha Toyota Jidoshokki Procédé de diagnostic d'insertion de trame dans un métier à tisser à jet d'air et appareil de diagnostic d'insertion de trame dans un métier à tisser à jet d'air
CN109943957A (zh) * 2017-12-13 2019-06-28 株式会社丰田自动织机 喷气式织机的引纬诊断方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3740789B2 (ja) * 1997-05-15 2006-02-01 株式会社豊田自動織機 パイル織機における織段発生防止方法及び装置
JP3576999B2 (ja) * 2001-05-24 2004-10-13 津田駒工業株式会社 織機における織段防止方法及び装置
JP2003041457A (ja) * 2001-07-27 2003-02-13 Tsudakoma Corp 織り前の移動制御方法
CN103869031B (zh) * 2012-10-19 2015-04-22 南通大学 保持色谱柱工作温度均匀的温度均匀器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207470A2 (fr) * 1985-06-29 1987-01-07 Nissan Motor Co., Ltd. Méthode et système pour enlever un fil de trame mal inséré
EP0229432A2 (fr) * 1986-01-13 1987-07-22 Tsudakoma Corporation Détecteur de fausse trame pour un métier à tisser à jet de fluide
CH668997A5 (en) * 1985-12-16 1989-02-15 Zellweger Uster Ag Re-start working parameter control - for weaving loom by warp tension sensor and microcomputer with memory

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207470A2 (fr) * 1985-06-29 1987-01-07 Nissan Motor Co., Ltd. Méthode et système pour enlever un fil de trame mal inséré
CH668997A5 (en) * 1985-12-16 1989-02-15 Zellweger Uster Ag Re-start working parameter control - for weaving loom by warp tension sensor and microcomputer with memory
EP0229432A2 (fr) * 1986-01-13 1987-07-22 Tsudakoma Corporation Détecteur de fausse trame pour un métier à tisser à jet de fluide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 8749, 31 October 1987 Derwent Publications Ltd., London, GB; Class F02, AN 87-345766 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0743384A3 (fr) * 1995-05-17 1997-09-24 Toyoda Automatic Loom Works Procédé et appareil pour la commande de l'utilisation d'air comprimé dans un métier à jet d'air
CN105420895A (zh) * 2015-12-30 2016-03-23 吴江万工机电设备有限公司 一种筘槽内核心气流测量装置
EP3348688A1 (fr) * 2017-01-13 2018-07-18 Kabushiki Kaisha Toyota Jidoshokki Procédé de diagnostic d'insertion de trame dans un métier à tisser à jet d'air et appareil de diagnostic d'insertion de trame dans un métier à tisser à jet d'air
CN108301105A (zh) * 2017-01-13 2018-07-20 株式会社丰田自动织机 喷气式织机的引纬诊断方法及喷气式织机的引纬诊断装置
CN108301105B (zh) * 2017-01-13 2020-05-15 株式会社丰田自动织机 喷气式织机的引纬诊断方法及喷气式织机的引纬诊断装置
CN109943957A (zh) * 2017-12-13 2019-06-28 株式会社丰田自动织机 喷气式织机的引纬诊断方法

Also Published As

Publication number Publication date
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JP3170863B2 (ja) 2001-05-28

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