EP0382662A1 - Dispositif pour la détection de défauts du fil de trame dans une machine à tisser - Google Patents

Dispositif pour la détection de défauts du fil de trame dans une machine à tisser Download PDF

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Publication number
EP0382662A1
EP0382662A1 EP90420066A EP90420066A EP0382662A1 EP 0382662 A1 EP0382662 A1 EP 0382662A1 EP 90420066 A EP90420066 A EP 90420066A EP 90420066 A EP90420066 A EP 90420066A EP 0382662 A1 EP0382662 A1 EP 0382662A1
Authority
EP
European Patent Office
Prior art keywords
machine
weft
weft thread
control
detection
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Withdrawn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
EP90420066A
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German (de)
English (en)
French (fr)
Inventor
Roger Fourneaux
Gilles Grandvallet
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.)
Saurer Diederichs SA
Original Assignee
Saurer Diederichs SA
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 Saurer Diederichs SA filed Critical Saurer Diederichs SA
Publication of EP0382662A1 publication Critical patent/EP0382662A1/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Withdrawn legal-status Critical Current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
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • the present invention relates to a device for detecting defects in the weft thread in a weaving machine.
  • the invention relates in particular to a device capable of detecting faults relating to the weft feed, in particular in a weaving machine provided with a double weft feed system, such as when a fault is detected on one of the supply systems, there is automatic switching to the other supply system, and switching to another weft thread kept on standby, which allows manual troubleshooting on the first feeding system without stopping the operation of the weaving machine.
  • Such a weaving machine requires, in the two weft feed systems, special detectors which are added to the detection means already provided in the usual way for checking the correct insertion of the weft.
  • the principle of European patent application No. 0 195 469 is hardly suitable for a weaving machine with pneumatic insertion of the weft by means of air jets ejected by nozzles.
  • the present invention aims to eliminate these drawbacks by providing an improved device which renders the detectors placed in the supply systems useless by simply using the existing detectors of the "weft breaker" type, this device being applicable without difficulty to weaving machines with pneumatic weft insertion, and more particularly suitable for weaving machines of this kind which are equipped with a so-called "unweaving" system, capable of removing defective wefts in whole picks or pick fragments.
  • the subject of the invention is essentially a device for detecting defects in the weft thread in a weaving machine, which use in combination: - means for detecting the presence or absence of the weft thread, on the side of its arrival at the end of insertion; - "untwisting" means put into action automatically after detection of any anomaly by the aforementioned means and stopping the weaving machine; - processing and control means intervening in two successive control times during the "unweaving", in connection with the aforementioned detection means, to restart the weaving machine or to stop it completely or to switch it from a system feed to another weft feed system, depending on the states detected in the first time and in the second control time.
  • the device which is the subject of the invention succeeds in distinguishing different types of defects relating to the weft, and in controlling on the weaving machine the actions required by these defects by carrying out an analysis on a first "unweaving", and possibly on a second "untwisting" if a fault persists when the machine is restarted after a first untwisting.
  • This particular type of fault can be effectively detected by an automatic sequence comprising successively: - A first fault detection by the detection means located on the side of the arrival of the weft thread at the end of insertion; - a shutdown of the machine followed by a first "untwisting" with control in two stages; - restarting the machine following which the aforementioned detection means note the persistence of the fault; - a new shutdown of the machine followed by a second "untwisting" with two-step control showing that when the machine was restarted, no thread was inserted across the width of the fabric .
  • the invention is here described in the case of its application to a weaving machine without shuttle, with pneumatic insertion of the weft thread 1 into the fabric in formation 2, from a reserve of fixed weft located on one side of the fabric 2.
  • the weft thread 1 assumed during weaving comes from a supply spool 3, placed on one side of the weaving machine, and it first arrives at a pre-deliverer 4 which measures corresponding lengths of thread to a pick and which releases the wire in successive lengths each corresponding to a pick.
  • the weft thread 1 then passes through a fixed nozzle 5, then through a launching nozzle 6 mobile with the comb (not shown), the fixed nozzles 5 and mobile 6 being supplied with compressed air to give the wire 1 the initial acceleration necessary for its insertion.
  • the weft thread 1 In its crossing of the "crowd" formed by the warp threads, the weft thread 1 is in a known way guided inside an insertion channel, and its movement is maintained by relay nozzles not shown, distributed over the width of the fabric 2 and supplied sequentially with compressed air. Once inserted, each pick is separated from the rest of the weft thread 1 by a cutting means 7 placed at the edge of the fabric 2 on the side of the mobile launch nozzle 6, after which the next pick can be inserted in the same way .
  • Optical control means 8 of the "weft breaker" type disposed towards the edge of the fabric 2 remote from the launching nozzle 6, also ensure detection of the actual arrival of the weft yarn 1 as far as this edge of the fabric 2.
  • These control means 8 emit signals directed towards processing means 9, which are themselves connected to a central unit 10 for controlling the weaving machine.
  • this weaving machine is equipped with additional supply means making it possible to maintain a second weft thread 11 on standby.
  • These means include a second supply reel 12, a second pre-delivery meter 13 and a second fixed nozzle 14, similar to those previously described and located on the same side of the weaving machine.
  • Switching means 15 are provided for controlling, if necessary, the passage from the first supply means 3,4,5 to the other supply means 12,13,14, or vice versa, in particular for continuing weaving with the weft thread. 11 remained on standby, when the weft thread 1 previously used is broken, these switching means being themselves under the control of the central unit 10.
  • the mobile launch nozzle 6 is common to the two supply systems, each of the fixed nozzles 5 and 14 directing the corresponding weft thread 1 or 11 towards this nozzle common mobile.
  • the mobile nozzles are two in number, like the fixed nozzles 5 and 14, each mobile nozzle being in this case assigned to a separate weft thread.
  • the weaving machine considered here is provided with means 16 provided for the extraction of waste from a broken or defective weft thread.
  • These are in particular pneumatic means displaceable over the entire width of the fabric 2, as described in the previous patent application No. 88 07257 filed on May 25, 1988 in the name of the Applicant.
  • These means 16 fulfill a so-called "untwisting" function, in association with a blowing sequence of the relay nozzles.
  • the combined action of the means of optical control 8, processing means 9 associated with the latter and "unweaving" means 16 makes it possible to detect a breakage of the weft thread during weaving which occurs upstream of the launching nozzle 6, therefore in the system supply 3,4,5 or 12,13,14 in service.
  • the intervention of the central unit 10 and the switching means 15 allows, in the event of the detection of such a breakage of the weft thread 1, automatic passage over the weft thread 11 on standby, delivered by the other feeding system, for the immediate continuation of weaving.
  • FIG. 2 illustrates the various situations which may be encountered when the optical control means 8 detect an anomaly on the side of the arrival of the weft thread and then control the automatic stopping of the weaving machine.
  • the five successive lines correspond to situations identified A to E in the left column, and shown diagrammatically in the second column where the position of the thread relative to the selvedges of the fabric is represented symbolically.
  • the third column of the diagram in FIG. 2 indicates the state of control by the optical means 8, during a first "unweaving", carried out after the machine has stopped.
  • These control means intervene in two successive stages; the first control time T1 is located at the start of the "untwisting" action and must make it possible to note the passage of at least one piece of yarn waste being extracted, while the second control time T2 is located at the end of the "untwisting” action, when the yarn waste (s) should in principle be disposed of.
  • the detection of the presence of a wire is symbolized by “1”, and the observation of the absence of a wire is symbolized by "O", this for both of the control times T1 and T2 .
  • the entire automatic sequence of control and permutation of the weft threads can be carried out in a very short time, for example around 20 seconds.
  • the invention is not limited to the sole embodiment of this device for detecting weft yarn faults in a weaving machine which has been described above, by way of example. ; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle.
  • the invention could also be adapted to a weaving machine with a weft feed system not double but simple, which would be provided with means for automatic repair of weft breaks in the feed system.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP90420066A 1989-02-07 1990-02-06 Dispositif pour la détection de défauts du fil de trame dans une machine à tisser Withdrawn EP0382662A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8901918 1989-02-07
FR8901918A FR2642769B1 (fr) 1989-02-07 1989-02-07 Dispositif pour la detection de defauts du fil de trame dans une machine a tisser

Publications (1)

Publication Number Publication Date
EP0382662A1 true EP0382662A1 (fr) 1990-08-16

Family

ID=9378780

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420066A Withdrawn EP0382662A1 (fr) 1989-02-07 1990-02-06 Dispositif pour la détection de défauts du fil de trame dans une machine à tisser

Country Status (5)

Country Link
US (1) US5016676A (cs)
EP (1) EP0382662A1 (cs)
JP (1) JPH0314657A (cs)
CS (1) CS59790A2 (cs)
FR (1) FR2642769B1 (cs)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659361B1 (fr) * 1990-03-06 1994-07-29 Saurer Diederichs Sa Dispositif de detissage automatique pour machines a tisser avec organes d'insertion mecanique de la trame.
US5343898A (en) * 1990-04-17 1994-09-06 Iro Ab Method and apparatus for threading-up yarn in a pulsating manner
DE4209686C2 (de) * 1992-03-25 1995-02-02 Dornier Gmbh Lindauer Verfahren und Vorrichtung zur Herstellung von insbesondere knotenfreien Gewebe auf Luftdüsenwebmaschinen
DE19521106A1 (de) * 1995-06-09 1996-12-12 Dornier Gmbh Lindauer Verfahren zur Schußstoppbehebung
JP3157776B2 (ja) * 1998-04-17 2001-04-16 津田駒工業株式会社 織機の起動方法
US6997215B2 (en) * 2003-03-24 2006-02-14 Sultex Ag Method for weaving low flaw cloths by means of the elimination of weft thread sections which have irregularities
US20160059800A1 (en) * 2014-09-03 2016-03-03 Prettl Electric Corp. Air Set Device
JP7077968B2 (ja) * 2019-01-14 2022-05-31 株式会社豊田自動織機 エアジェット織機の緯糸処理装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573499A (en) * 1983-04-01 1986-03-04 Tsudakoma Kogyo Kabushiki Kaisha Weft detection stopper for looms
EP0229432A2 (en) * 1986-01-13 1987-07-22 Tsudakoma Corporation Faulty picking diagnosing system for a fluid jet loom
EP0236597A1 (en) * 1986-03-11 1987-09-16 Tsudakoma Corporation Mispick removing device for a shuttleless loom
EP0195469B1 (en) * 1985-03-19 1989-03-29 Picanol N.V. Weaving machine with improved feed for the woof
EP0309013A1 (en) * 1987-08-26 1989-03-29 Picanol N.V. Method for removing a faulty weft thread from the shed on a weaving machine, and a weaving machine which uses this method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63235546A (ja) * 1987-03-23 1988-09-30 日産自動車株式会社 複数の布を製織する織機の駆動制御方法
BE1001513A3 (nl) * 1988-03-16 1989-11-14 Picanol Nv Weefmachine, met een verbeterde voeding voor de inslagdraden.
BE1001538A3 (nl) * 1988-03-16 1989-11-21 Picanol Nv Luchtweefmachine, met een verbeterde voeding voor de inslagdraden.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573499A (en) * 1983-04-01 1986-03-04 Tsudakoma Kogyo Kabushiki Kaisha Weft detection stopper for looms
EP0195469B1 (en) * 1985-03-19 1989-03-29 Picanol N.V. Weaving machine with improved feed for the woof
EP0229432A2 (en) * 1986-01-13 1987-07-22 Tsudakoma Corporation Faulty picking diagnosing system for a fluid jet loom
EP0236597A1 (en) * 1986-03-11 1987-09-16 Tsudakoma Corporation Mispick removing device for a shuttleless loom
EP0309013A1 (en) * 1987-08-26 1989-03-29 Picanol N.V. Method for removing a faulty weft thread from the shed on a weaving machine, and a weaving machine which uses this method

Also Published As

Publication number Publication date
CS59790A2 (en) 1991-08-13
US5016676A (en) 1991-05-21
JPH0314657A (ja) 1991-01-23
FR2642769A1 (fr) 1990-08-10
FR2642769B1 (fr) 1991-10-25

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