EP0446150B1 - Vorrichtung zum automatischen Entweben an Webmaschinen mit mechanischem Schusseintrag - Google Patents

Vorrichtung zum automatischen Entweben an Webmaschinen mit mechanischem Schusseintrag Download PDF

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Publication number
EP0446150B1
EP0446150B1 EP91420057A EP91420057A EP0446150B1 EP 0446150 B1 EP0446150 B1 EP 0446150B1 EP 91420057 A EP91420057 A EP 91420057A EP 91420057 A EP91420057 A EP 91420057A EP 0446150 B1 EP0446150 B1 EP 0446150B1
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EP
European Patent Office
Prior art keywords
pick
defective
weft
waste
fabric
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.)
Expired - Lifetime
Application number
EP91420057A
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English (en)
French (fr)
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EP0446150A1 (de
Inventor
Pierre Pierson
Roger Fourneaux
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.)
ICBT Diederichs SAS
Original Assignee
Saurer Diederichs SA
ICBT Diederichs SAS
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, ICBT Diederichs SAS filed Critical Saurer Diederichs SA
Publication of EP0446150A1 publication Critical patent/EP0446150A1/de
Application granted granted Critical
Publication of EP0446150B1 publication Critical patent/EP0446150B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
    • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
    • D03D51/085—Extraction of defective weft

Definitions

  • the present invention relates to a unwinding device, that is to say a device which, on a weaving machine, ensures the extraction of a defective pick, to remove it from the fabric being formed.
  • the device in question automatically performs the stretching operation, after detection of a weft defect, in particular when an inserted pick is recognized as being broken, or of inappropriate length, by conventional detection means.
  • This invention relates, more particularly, to an automatic unwinding device, specially designed for weaving machines equipped with mechanical weft insertion members, in particular pliers which transfer the weft yarn, by exchanging it. 'One clamp to the other in the middle of the width of the fabric being formed.
  • the present invention overcomes these drawbacks by providing an automatic unwinding device for a weaving machine with a mechanical weft insertion member, as described in the claims.
  • the invention thus provides an automatic unwinding device particularly suitable for weaving machines equipped with mechanical weft insertion members.
  • the essential inventive idea consists in evacuating the defective pick and / or the weft waste, not in the direction of insertion, but in the opposite direction, that is to say by bringing them towards the "food" side. This makes it possible to avoid cutting the defective piece of the weft thread, and also makes it possible to maintain the part of the thread which follows the defective pick, so that the automatic restarting of the weaving machine is facilitated.
  • the pneumatic means for "taking off” of the defective pick and / or weft waste consist, advantageously, of an air injector movable in translation in the direction of the width of the fabric, over the entire width of this fabric.
  • These pneumatic "take-off” means are advantageously provided for bringing the defective pick and / or the weft waste into the channel delimited by the comb of the weaving machine and by the two layers of warp threads, while the pneumatic means d evacuation intervening after the "take off” of the defective pick and / or of the frame waste, use said channel as a pneumatic guide.
  • These pneumatic evacuation means preferably comprise a series of evacuation nozzles distributed over the width of the fabric and capable of emitting air jets oriented towards the "supply" side of the weaving machine. The discharge nozzles can be mounted on the supports of the guides intended for the mechanical insertion members of the weft.
  • the unwinding device also comprises, on the "feeding" side of the weaving machine, means for laterally deflecting the defective pick and / or the weft waste outside the zone crossed by the mechanical insertion members, and means for definitive elimination of the defective pick and / or weft waste.
  • the means for laterally deflecting the defective pick and / or the frame waste can be produced in the form of a deflection nozzle, while the means for definitive elimination of the defective pick and / or the waste are realizable in the form of '' a discharge nozzle, the inlet opening of which is situated opposite the deflection nozzle.
  • the automatic unwinding device thus ensures the complete elimination of defective picks and weft waste by simple and economical pneumatic means, added for this purpose on a fundamentally mechanical weaving machine.
  • the means for controlling the proper evacuation of the defective pick and / or weft waste are optical means housed inside the suction nozzle. These means make it possible in particular to control the presence of a defective pick during elimination, engaged in the suction nozzle, but not yet separated from the rest of the wire, the defective pick being then stretched between a fixed point, belonging for example to a weft selector, and the suction nozzle. The observation of the effective presence of this stretched defective pick causes an automatic restarting sequence of the weaving machine, with interception and resumption of the rest of the weft thread by a mechanical insertion member, and separation of the defective weft ensuring its final elimination by aspiration.
  • the weaving machine shown in the drawing comprises two movable members for mechanical insertion of the weft, constituted respectively by a first clamp 1, mounted at the free end of a first ribbon 2, and by a second clamp 3, mounted at the free end of a second strip 4.
  • the weft thread 5 comes from at least one supply spool 6, located on one side of the weaving machine, and it first passes over at least one pre-feeder 7.
  • several weft threads are supplied by supply coils 6 and pre-deliverers 7 in corresponding numbers, and these wires pass through eyelets 8 belonging to movable selection fingers 9, themselves controlled by a weft selector 10. Downstream of the selection fingers 9, the weft thread 5 passes over a separation finger 11, near which a scissor 12 is arranged - see also Figures 2 and following. All the components mentioned in this paragraph are located on the "feed" side of the weaving machine.
  • the machine Over the width of the fabric 13 being formed, the machine comprises, in a conventional manner, a comb 14 and heald frames 15, crossed by the plies of warp threads 16 and 17. Taking into account the nature of the organs of insertion of the weft, guides 18 are also provided for the ribbons 2 and 4, these guides 18 being carried by supports 19, clearly visible in FIG. 2, and being distributed over the width of the fabric 13. The false selvedges 20 of this fabric 13, pass over other guides 21 ( Figure 1).
  • the first clamp 1 drives the weft thread 5 to the middle of the width of the fabric 13, where an exchange takes place with the second clamp 3, which then takes the thread 5 with it, right up to the side of the machine opposite that of the feed.
  • the chisel 12 makes it possible to separate the inserted pick from the rest of the weft thread 5, after which the next pick can be inserted in the same way.
  • Detection means of the “weft breaker” type, of piezoelectric type, indicated diagrammatically at 22 in FIG. 1, detect the correct insertion, or if necessary defective, of the weft thread 5.
  • additional "untwisting" members are provided for the elimination, out of the tissue 13, of a pick recognized as defective by the detection means 22.
  • These essentially pneumatic members include, as shown in FIGS. 4 and following, an air injector 23, movable in translation in the direction of the width of the fabric 13, over the entire width of this fabric.
  • the displacement of the air injector 23 ensures the "take-off" of a defective pick, or of frame waste, by moving them away from the previously inserted picks.
  • the pneumatic stretching members also comprise, distributed over the width of the fabric 13, discharge nozzles 24, which can be mounted on the supports 19 of the guides 18 of the tapes 2 and 4, as shown in FIG. 2.
  • the jets d air from the exhaust nozzles 24 are directed in the width direction of the fabric 13, and they are all directed towards the "supply" side of the weaving machine.
  • the pneumatic stretching members finally comprise, on this "supply" side of the weaving machine, a deflection nozzle 25, located near the separation finger 11, and a suction nozzle 26, placed opposite the deflection 25.
  • Control photocells 27 are housed inside the suction nozzle 26, as shown in Figures 3 and following.
  • the air injector 23 After detecting a faulty insertion, as illustrated in FIG. 4, the air injector 23 describes a back-and-forth movement over the entire width of the fabric 13, as indicated in FIGS. 5 and 6; during this movement of the air injector 23, the defective pick 28 and / or the weft waste 29 are "peeled off" from the pick previously inserted, by the effect of air blowing.
  • Air jets 30 are then emitted in the channel delimited by the comb 14 and by the plies of warp threads 16 and 17
  • the defective pick 28 and / or the waste 29 are thus evacuated in this channel, in the direction of the "supply" side, therefore according to a movement in the opposite direction to that of the insertion.
  • the cells 27 check at this time the presence of the defective pick 28 and / or the passage of the waste 29 in the evacuation nozzle 26.
  • the defective weft 28 remains attached following the weft thread 5, and this defective weft 28 is finally stretched between a selection finger 9, the separation finger 11 and the suction nozzle 26, as shown in Figure 8, as well as in Figure 3.
  • the first clamp 1 grasps and drives the weft thread 5, while the chisel 12 definitively separates the defective pick 28, which has hitherto remained attached to the continuation of the thread. While the insertion of the next pick has already started, the suction nozzle 26 completes the evacuation of the defective weft 28, which is then completely eliminated - see FIG. 10.
  • the invention is not limited to the sole embodiment of this automatic unwinding device for weaving machines with mechanical wefts insertion devices, 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 deflection nozzle could be directed differently, for example upwards or downwards, and moreover, the invention remains applicable to weaving machines in which the mechanical members for inserting the weft are other than pliers mounted at the end of ribbons.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Claims (3)

  1. Die Erfindung betrifft eine Vorrichtung zum automatischen Losweben für eine Webmaschine mit:
    . Vorrichtungen für die Zuführung (6-8) des Schußfadens (5), die auf einer Seite des Webstuhls angebracht sind;
    . einer mechanischen Vorrichtung (1-4) für den Eintrag des Schußfadens (5) in einen durch zwei Kettfadenlagen (16,17) und ein Webblatt (14) umgrenzten Kanal, zur Bildung der Stoffbahn (13), die auf Sockeln (19) befestigte Führungen (18) aufweist;
    dadurch gekennzeichnet, daß sie ebenfalls folgende Einrichtungen umfaßt:
    - pneumatische Mittel für die Ablösung eines schadhaften Schußfadens (28) und/oder Schußbruchs (29), mit denen letztere von der zuvor eingetragenen Schußfadenlänge entfernt und in den Eintragskanal befördert werden; bestehend aus einem Luftinjektor (23), der in Querrichtung zur Stoffbahn (13) über deren gesamte Breite hinweg bewegbar ist;
    - eine Anzahl Evakuierungsdüsen (24), die über die Breite der Stoffbahn (13) und den vorgenannten Eintragskanal verteilt und an den Sockeln (19) der Führungen (18) befestigt sind, die geeignet sind, Luftstrahlen (30) in Richtung der Schußzuführung des Webstuhls auszublasen, um den schadhaften Schußfaden (28) und/oder den Schußbruch (29) aus diesem Eintragskanal zu befördern, dabei wie ein pneumatischer Schußeintrag wirkend;
    - an der Schußzuführungsseite der Maschine angebrachte Mittel (25) zum seitlichen Wegziehen des schadhaften Schußfadens (28) und/oder Schußbruchs (29) aus dem Bereich der mechanischen Eintragsvorrichtungen (1-4);
    - Mittel (26) zur endgültigen Entfernung des schadhaften Schußfadens (28) und/oder Schußbruchs (29);
    - Kontrollmittel (27) für die ordnungsgemäße Entfernung des schadhaften Schußfadens (28) und/oder Schußbruchs (29);
    - sowie Mittel zum Eingreifen und zur Steuerung, die bei Feststellung eines Eintragfehlers und in Verbindung mit den vorgenannten Kontrollmitteln (27) zum Einsatz gelangen, um die pneumatischen Mittel (23, 24) für die Ablösung und Entfernung des Schußfadens in Gang zu setzen und die Webmaschine wiederanzufahren oder ganz anzuhalten.
  2. Automatische Loswebvorrichtung gemäß Patentanspruch 1, dadurch gekennzeichnet, daß die Mittel, die den schadhaften Schußfaden (28) und/oder den Schußbruch (29) zur Seite hin entfernen, in Form einer Ableitdüse (25) ausgeführt sind, während die Vorrichtungen zur endgültigen Beseitigung des schadhaften Schußfadens (28) und/oder Schußbruchs (29) in einer Ansaugdüse (26) bestehen, deren Eintrittsöffnung (31) sich gegenüber der Ableitdüse (25) befindet.
  3. Automatische Loswebvorrichtung gemäß Patentanspruch 1 und 2, dadurch gekennzeichnet, daß die Kontrollmittel für die ordnungsgemäße Beseitigung des schadhaften Schußfadens (28) und/oder Schußbruchs (29) im Inneren der Ansaugdüse (26) angeordnete optische Geräte (27) sind.
EP91420057A 1990-03-06 1991-02-20 Vorrichtung zum automatischen Entweben an Webmaschinen mit mechanischem Schusseintrag Expired - Lifetime EP0446150B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR909003358A FR2659361B1 (fr) 1990-03-06 1990-03-06 Dispositif de detissage automatique pour machines a tisser avec organes d'insertion mecanique de la trame.
FR9003358 1990-03-06

Publications (2)

Publication Number Publication Date
EP0446150A1 EP0446150A1 (de) 1991-09-11
EP0446150B1 true EP0446150B1 (de) 1995-08-23

Family

ID=9394790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91420057A Expired - Lifetime EP0446150B1 (de) 1990-03-06 1991-02-20 Vorrichtung zum automatischen Entweben an Webmaschinen mit mechanischem Schusseintrag

Country Status (6)

Country Link
US (1) US5090454A (de)
EP (1) EP0446150B1 (de)
JP (1) JPH04228655A (de)
CS (1) CS56691A2 (de)
DE (2) DE69112240T4 (de)
FR (1) FR2659361B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940009396A (ko) * 1992-10-02 1994-05-20 고시바 헤이지 다색용 레피아 직기에 있어서의 불량위사 분리장치
IT1276828B1 (it) * 1995-10-06 1997-11-03 Somet Soc Mec Tessile Metodo per l'estrazione automatica di fili di trama difettosi dal passo di un telaio a pinze
JPH1187928A (ja) * 1997-07-08 1999-03-30 Ibiden Co Ltd 多層プリント配線板
EP2034061B1 (de) * 2007-09-10 2010-09-01 ITEMA (Switzerland) Ltd. Schneidvorrichtung für eine Webmaschine und Verfahren zum Betrieb derselben
CZ306814B6 (cs) * 2015-12-28 2017-07-19 VĂšTS, a.s. Způsob odstranění útku chybně zaneseného hydraulickým prohozem do prošlupu hydraulického tkacího stroje a zařízení k jeho provádění
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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH578070A5 (de) * 1973-10-20 1976-07-30 Dornier Gmbh Lindauer
NL8202215A (nl) * 1982-06-01 1984-01-02 Rueti Te Strake Bv Spoelloze weefmachine, voorzien van middelen voor het uit het weefvak verwijderen van defecte inslagdraden.
US4502512A (en) * 1982-07-21 1985-03-05 Seisakusho Kabushiki Kaisha Toyoda Jidoshokki Method for treating a weft yarn upon stoppage of a shuttleless loom and device for effecting the same
NL8204665A (nl) * 1982-12-01 1984-07-02 Rueti Te Strake Bv Spoelloze weefmachine, voorzien van middelen voor het uit het weefvak verwijderen van defecte inslagdraden.
NL8602827A (nl) * 1986-11-07 1988-06-01 Picanol Nv Werkwijze voor het losmaken van foutieve inslagdraden bij weefmachines en inrichting hierbij aangewend.
BE1000904A4 (nl) * 1987-09-04 1989-05-09 Picanol Nv Werkwijze voor het losmaken van foutieve inslagdraden bij weefmachines en inrichting die deze werkwijze toepast.
BE1001507A3 (nl) * 1988-03-10 1989-11-14 Picanol Nv Werkwijze voor het uit de gaap verwijderen van een los foutief inslagdraadgedeelte bij weefmachines.
BE1001508A3 (nl) * 1988-03-10 1989-11-14 Picanol Nv Werkwijze voor het uit de gaap verwijderen van een foutief inslagdraadgedeelte bij weefmachines.
FR2631980B1 (fr) * 1988-05-25 1990-08-24 Saurer Diederichs Sa Dispositif pour l'extraction d'un fil de trame defectueux, sur une machine a tisser
CS275271B2 (en) * 1988-09-01 1992-02-19 Tovarny Textilnich Potreb Elit Device for choked and beaten-up weft removal on looms
FR2642769B1 (fr) * 1989-02-07 1991-10-25 Saurer Diederichs Sa Dispositif pour la detection de defauts du fil de trame dans une machine a tisser

Also Published As

Publication number Publication date
FR2659361A1 (fr) 1991-09-13
DE69112240D1 (de) 1995-09-28
JPH04228655A (ja) 1992-08-18
US5090454A (en) 1992-02-25
EP0446150A1 (de) 1991-09-11
FR2659361B1 (fr) 1994-07-29
CS56691A2 (en) 1991-09-15
DE69112240T2 (de) 1996-02-01
DE69112240T4 (de) 1996-04-25

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