EP0567428B1 - Procédé pour démarrer un métier à tisser et métier à tisser pour effectuer ce procédé - Google Patents

Procédé pour démarrer un métier à tisser et métier à tisser pour effectuer ce procédé Download PDF

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Publication number
EP0567428B1
EP0567428B1 EP93810211A EP93810211A EP0567428B1 EP 0567428 B1 EP0567428 B1 EP 0567428B1 EP 93810211 A EP93810211 A EP 93810211A EP 93810211 A EP93810211 A EP 93810211A EP 0567428 B1 EP0567428 B1 EP 0567428B1
Authority
EP
European Patent Office
Prior art keywords
weaving
motion
shed
phase
loom
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
EP93810211A
Other languages
German (de)
English (en)
Other versions
EP0567428A1 (fr
Inventor
Klaus Berktold
Kurt Günther
Anton Egloff
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.)
Itema Switzerland Ltd
Original Assignee
Sultex AG
Maschinenfabrik Rueti AG
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 Sultex AG, Maschinenfabrik Rueti AG filed Critical Sultex AG
Priority to EP93810211A priority Critical patent/EP0567428B1/fr
Publication of EP0567428A1 publication Critical patent/EP0567428A1/fr
Application granted granted Critical
Publication of EP0567428B1 publication Critical patent/EP0567428B1/fr
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
    • D03D51/002—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
    • D03D51/005—Independent drive motors

Definitions

  • the invention relates to a method for starting a weaving machine after a standstill phase, in particular after an interruption of the weaving process in order to remedy an error in the formation of the fabric, which weaving machine has a warp let-off device, a goods take-off device, a shedding device and a weaving drawer for attaching a weft thread which is respectively inserted into a shed contains the fabric edge of the fabric, in a first start phase the fabric edge being held in an alternative position distant from a stop position of the sley, a weft feed is blocked in the shed and the weaving machine is driven idle and the edge of the fabric is then returned against the stop position of the sley, and wherein in a second starting phase, the weft thread is entered into the shed.
  • the invention further relates to a weaving machine for carrying out the method.
  • the edge of the goods is held in a forward avoidance position at a distance from the stop position of the sley until a certain stop force is reached (JP Patent Publication 2-169749).
  • the operational The intended full lifting force is generally achieved in the second weaving cycle, so that in the known embodiment the weft insertion can take place after the first weaving cycle carried out in idle mode.
  • sensitive fabrics for example light fabrics for women's outer clothing
  • visible contact points can appear in the fabric when the weaving machine is restarted to continue the interrupted weaving process. It has been shown that the measures known hitherto, in particular in the case of weaving machines with high speed and correspondingly high weft insertion rate, cannot reliably prevent the formation of such contact points.
  • the invention has for its object to provide a method, particularly improved in this respect, for starting a weaving machine, in particular for restarting after a malfunction has been remedied, by which the formation of contact points in the fabric is reliably avoided even in weaving machines with a high weft insertion rate.
  • the inventive control of the shedding device and at least one of the warp let-off and fabric take-off devices permits a targeted influencing of the parameters which are decisive for a uniform fabric image, in particular a restoration of the tension of the warp threads existing before the weaving process is interrupted, until the weaving machine returns to its original, the normal weaving operation has reached the corresponding speed and its corresponding dynamic operating state resulting from the interaction of the individual units. Due to a control signal triggered when this operating state is reached Monitoring device of the weaving machine, the shedding device and the aggregates interacting therewith can be switched over at any time, ie after each of the idling weaving cycles, to the operational weaving program to initiate the second starting phase of the method according to the invention.
  • the weaving machine according to the invention for performing the method is the subject of claim 5.
  • the warp beam 1 contains a warp beam 1, a tensioning beam 2, a shedding device 3 and a sley 4, and a breast beam 5, a goods take-off roller 6, a pressure roller 7 and a goods tree 8.
  • the warp beam 1 is coupled to a warp let-off device 10 according to the arrows 11 and 11a.
  • the goods take-off roller 6 is coupled to a goods take-off device 12 according to the arrows 13 and 13a.
  • Warp threads 14 are guided from the warp beam 1 through the shedding device 3 against a fabric edge 15 and from there as part of a fabric 16 formed there against the fabric tree 8, onto which the fabric 16 is wound.
  • the shedding device 3 contains a number of heald frames 17, only two of which are shown in the drawing, and a drive device 18, by means of which the heald frames 17 can each be adjusted to form a shed 20.
  • a weft insertion device coupled to the main drive of the loom by a weft insertion means, e.g. Compressed air or, as indicated in the drawing, e.g. band-shaped gripper element 21, a weft thread 22 is inserted, which in a stop position 4 'of the sley 4, which can be pivoted via a drive device 23, is attached to the fabric edge 15 and is integrated by a subsequent change of subject.
  • a weft insertion means e.g. Compressed air or, as indicated in the drawing, e.g. band-shaped gripper element 21, a weft thread 22 is inserted, which in a stop position 4 'of the sley 4, which can be pivoted via a drive device 23, is attached to the fabric edge 15 and is integrated by a subsequent change of subject.
  • the drives of the warp let-off device 10 and the take-off device 12 as well as the drive device 18 of the shedding device 3 can each be controlled by a common control device 24 in accordance with a weaving program.
  • the drive device 23 of the sley 4 can be coupled to the main drive of the weaving machine or, as shown, can also be controlled by itself via the control device 24.
  • the control device 24 is in a known manner via signal lines 27, 28, 30; 31, 32 can be influenced by control signals from numerous monitoring devices, by means of which For example, the tension of the warp threads 14 and the weft threads 22 and the state of the fabric 16 formed are detected.
  • a sensor 25 for monitoring the position of the fabric edge 15 and a device 26 for detecting an error, for example an incorrectly inserted weft thread 22, are indicated in the fabric 16 formed.
  • the sensor 25 and the device 26 are connected to the control device 24 via the signal lines 27 and 28, respectively.
  • the drives of the individual units of the weaving machine are coordinated with one another via the control device 24 and controlled in accordance with the predetermined weaving program during normal weaving operation.
  • the weaving machine is stopped by a corresponding control signal of the monitoring element in question and, if necessary, for example to remove an incorrectly entered weft thread, by resetting the corresponding units - the warp let-off device 10, the goods take-off device 12 and the shedding device 3 - returned to an operating position intended for the continuation of the interrupted weaving according to the program.
  • the goods edge 15 is moved from the position shown in full lines to one of the stop position 4 'of the sley 4 by stepwise driving the warp beam 1 and the goods take-off roller 6 according to the arrows 11 and 13 respectively removed, dash-dotted alternative position 15 'adjusted and held in this during part of a first starting phase.
  • the gear unit connected to at least one unit of the weaving machine for example the weft insertion device, cannot The main drive of the weaving machine shown is started and then at least one of the other units - the shedding device 3, the warp let-off device 10 and the goods take-off device 12 and optionally the weaving sley 4 - are optionally switched on in succession.
  • the weaving machine - with blocked weft feed to the weft insertion means 21 - is driven for a number, for example two to twenty or more, idle weaving cycles until it has reached its original speed corresponding to normal weaving operation and the original tension of the warp threads 14 is restored and all of their aggregates work together in the appropriate, original rhythm.
  • the shedding device 3 is controlled via the control device 24 independently of the operationally provided weaving program in such a way that the heald frames 17 assume a position in each of the idling weaving cycles that corresponds to an open position of the shed 20 in which the last correctly entered weft thread 22 is securely bound by the warp threads 14 on the fabric edge 15 in the avoidance position 15 '.
  • the heald frames 17, as shown in FIG. 2 can be kept in the same open shed position over all weaving cycles of the first starting phase or, as shown in FIGS. 3 and 4, according to their own, from the operational weaving program different start program can be controlled.
  • At least one of the monitoring devices of the weaving machine for example the device 26 assigned to the fabric 16 or a guard element (not shown) which detects the tension of the warp threads 14, is triggered via the control device 24 in response to a corresponding control signal a reverse rotation of the warp beam 1 and / or the take-off roller 6 in the direction of the arrows 11a and 13a is initiated and the edge of the goods 15 is returned against the stop position 4 'of the sley 4.
  • the shedding device 3, the warp let-off device 10 and the take-off device 12 are again activated according to the operationally predetermined weaving program in the sense of a continuation of the interrupted weaving process, the weft thread 22 being transferred to the weft insertion means 21 into the shed 20 formed according to the weaving program , is struck on the edge of the goods 15 and is integrated by a program change following the program. Since this weft insertion occurs due to the starting method according to the invention with the same warp thread tension and under the same dynamic operating conditions as the weft insertion carried out before the interruption of the weaving process, the formation of a visible contact point in the fabric can be avoided in most cases.
  • This degree of displacement corresponds to a defined fraction, e.g. 20 to 60% of the warp and fabric feed determined by the weaving program after each weft insertion and is in each case, e.g. can be influenced in accordance with the properties of the warp and / or weft material to be processed, via the warp let-off device 10 and / or the goods take-off device 12 or by appropriate activation of the tensioning tree 2 and / or the breast tree 5.
  • the goods edge 15 is removed from the compensating position 15a or 15b in a predetermined number, e.g. one to ten or more, the same sub-steps each before one of the following weft entries into a corresponding intermediate position and finally into the target position.
  • the operationally constant weft density of the fabric 16, determined by the set warp and fabric feed can vary within the predetermined limits and thus prevent the occurrence of a fabric defect that occurs in particular within a selectable fabric section limited by the number of partial steps , if, at constant weft density, the wrap angle of the warp threads wrapping around the weft threads deviate from a target value which is established in normal weaving operation.
  • This embodiment of the method according to the invention can thus compensate for different wrap angles of the warp threads wrapping around the weft threads and can be gradually adjusted to the operational target value of this wrap angle. Accordingly, the formation of a visible contact point in the tissue 16 can be prevented and an essentially uniform tissue image can be achieved.
  • the direction and the degree of the required displacement of the compensation position 15a or 15b relative to the stop position 4 'of the sley 4 can e.g. when weaving the weaving machine covered with the corresponding warp and weft material, determined by starting operations of the weaving machine carried out on a trial basis and adjusted in accordance with the result that can be achieved in the process.
  • the described correction of the position of the goods at the edge of the goods can be carried out automatically in each case by actuating the tensioning tree 2 and / or the breast tree 5.
  • a separate control unit 24a can be provided in the control device 24, which can be activated during the first starting phase and can be switched off before the start of the second starting phase.
  • a corresponding control unit 24a can also be designed as an installation part, which can optionally be installed in an existing control device, for example for retrofitting an existing weaving machine.
  • another shedding device e.g. a jacquard device may be provided.
  • FIG. 2 shows a shed 20a with one before the interruption of the weaving process in a weaving cycle Wa entered weft 22a, a shed 20b formed in accordance with the predetermined weaving program for the next weft insertion with a weft 22b entered in a weaving cycle Wb and a subsequent shed 20c with a weft 22c entered in a weaving cycle Wc.
  • the shed 20b is held in the open position over a plurality of, as shown, five weaving cycles W1 to W5 of the first start phase I as well as in the weave cycle Wb of the second start phase II, in which the weft thread 22b is entered according to the program.
  • the first start phase I can extend over a number, as shown four idle weaving cycles W1 to W4, the weaving shed 20b described above being formed in the weaving cycles W1, W3 and Wb, while in the weaving cycles W2 and W4 each form a different shed 20x, which does not appear in the operational weaving program, so that the weft thread 22a is securely bound.
  • the shed 20b can be held in the corresponding open position over several, as shown three, idle weaving cycles W1, W2 and W3 and combined with the shed 20x formed in the idle weaving cycle W4.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (6)

  1. Procédé pour démarrer un métier à tisser après une phase d'arrêt, notamment après une interruption de l'opération de tissage pour supprimer un défaut lors de la formation du tissu, ce métier à tisser comportant un dérouleur de chaîne (10), un dispositif d'enroulement du tissu (12), un dispositif de formation de la foule (3) et un battant (4) pour la butée d'un fil de trame (22 ; 22a, 22b, 22c) inséré respectivement dans une foule (20 ; 20a, 20b, 20c) contre le bord (15) du tissu, où dans une première phase de démarrage (I) le bord de tissu (15) est maintenu dans une position d'écartement (15') éloignée d'une position de butée (4') du battant (4), une amenée du fil de trame dans la foule (20 ; 20b) est bloquée et le métier à tisser est entraîné en marche à vide, et le bord de tissu (15) est ramené ensuite contre la position de butée (4') du battant (4), et où lors d'une deuxième phase de démarrage (II) le fil de trame (22 ; 22b) est inséré dans la foule (20 ; 20b), caractérisé en ce que le dispositif de formation de la foule (3) ainsi que le dérouleur de chaîne (10) et/ou le dispositif d'enroulement du tissu (12) sont commandés par un dispositif de commande (24) prévu pour la commande fonctionnelle du métier à tisser conformément à un programme de tissage prédéterminé dans la première phase de démarrage (I) pendant plusieurs cycles de tissage (W1, W2, W3, W4, W5) indépendamment de ce programme de tissage, en ce que le dispositif de formation de la foule (3) est maintenu pendant chacun des cycles de tissage (W1 - W5) exécutés en marche à vide dans une position de fonctionnement qui correspond à une position d'ouverture de la foule (20 ; 20b, 20x) dans laquelle le fil de trame (22 ; 22a) se trouvant au bord de tissu (15) est maintenu lié,
       en ce que le bord de tissu (15) pendant ces cycles de tissage (W1 - W5) est amené par l'intermédiaire du dérouleur de chaîne (10) et/ou du dispositif d'enroulement du tissu (12) d'une manière contrôlée à la position de butée (4') du battant (4), et
       en ce que après avoir atteint les valeurs de rotation correspondant à l'état de tissage normal ainsi que l'état de fonctionnement dynamique des appareils coopérants du métier à tisser, le dispositif de formation de la foule (3) ainsi que le dérouleur de chaîne (10) et le dispositif d'enroulement de tissu (12) sont commandés lors de la deuxième phase de démarrage (II), conformément au programme de tissage, dans le sens d'une continuation de l'opération de tissage.
  2. Procédé selon la revendication 1, caractérisé en ce que le dispositif de formation de la foule (3) est maintenu au moins pendant une partie de la première phase de démarrage (I) dans une position de fonctionnement qui correspond à une position d'ouverture de la foule (20 ; 20b) s'étendant sur plusieurs cycles de tissage (W1, W2, W3 ; W4, W5).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le dispositif de formation de la foule (3) est commandé au moins pendant une partie de la première phase de démarrage (I) selon un programme de démarrage propre, s'écartant du programme de tissage et est maintenu pendant au moins l'un des cycles de tissage (W2, W4) dans une position de fonctionnement qui correspond à une position ouverte d'une foule (20x) non comprise dans le programme de tissage.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le bord de tissu (15) est guidé à la fin de la première phase de démarrage (I) dans une position d'équilibrage (15a et, respectivement 15b) associée à la position de butée (4') du battant (4), qui est décalée par rapport à une position de consigne correspondant à la position de butée (4') d'une mesure qui correspond à une fraction définie sur laquelle on peut agir, par exemple, par le dispositif de commande (24) d'une avance de tissu (16) déterminée par le programme de tissage, prévue après chaque insertion de trame, et est guidé de cette position d'équilibrage (15a et, respectivement 15b) après la première insertion de trame effectuée dans la deuxième phase de démarrage (II) selon un nombre prédéfini de pas partiels respectivement avant l'une des insertions de trame suivantes vers la position de consigne.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'on fait démarrer tout d'abord une commande principale du métier à tisser relié par un mécanisme de transmission à au moins un appareil du métier à tisser, par exemple, un dispositif d'insertion de trame, qu'on met en circuit pendant les cycles de tissage suivants (W1 - W5) de la première phase de démarrage (I) sélectivement les uns après les autres respectivement au moins un appareil supplémentaire - le dispositif de formation de la foule (3), le battant (4) ainsi que le dérouleur de chaîne (10) et le dispositif d'enroulement de tissu (12), et que pendant la deuxième phase de démarrage (II), le fil de trame (22) est amené à un moyen d'insertion de trame (21) et/ou est libéré pour l'insertion de trame.
  6. Métier à tisser pour exécuter le procédé selon l'une des revendications 1 à 5, caractérisé en ce que le dispositif de commande (24) présente une unité de commande (24a) pouvant être activée au moins pendant la première phase de démarrage (I) et pouvant être désactivée pendant la deuxième phase de démarrage (II) en fonction d'un signal de commande d'un dispositif de surveillance du métier à tisser, par exemple d'un élément de surveillance (25) détectant une position prédéterminée du bord de tissu (15), unité de commande qui permet une commande indépendante du programme de tissage prévu selon la production du dispositif de formation de la foule (3) ainsi que du dérouleur de chaîne (10) et/ou du dispositif d'enroulement de tissu (12).
EP93810211A 1992-04-22 1993-03-24 Procédé pour démarrer un métier à tisser et métier à tisser pour effectuer ce procédé Expired - Lifetime EP0567428B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93810211A EP0567428B1 (fr) 1992-04-22 1993-03-24 Procédé pour démarrer un métier à tisser et métier à tisser pour effectuer ce procédé

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92810293 1992-04-22
EP92810293 1992-04-22
EP93810211A EP0567428B1 (fr) 1992-04-22 1993-03-24 Procédé pour démarrer un métier à tisser et métier à tisser pour effectuer ce procédé

Publications (2)

Publication Number Publication Date
EP0567428A1 EP0567428A1 (fr) 1993-10-27
EP0567428B1 true EP0567428B1 (fr) 1997-08-20

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EP93810211A Expired - Lifetime EP0567428B1 (fr) 1992-04-22 1993-03-24 Procédé pour démarrer un métier à tisser et métier à tisser pour effectuer ce procédé

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629725A1 (fr) * 1993-06-15 1994-12-21 Sulzer RàœTi Ag Procédé pour démarrer un métier à tisser et métier à tisser pour effectuer ce procédé
DE4438762C1 (de) * 1994-10-29 1995-09-28 Dornier Gmbh Lindauer Verfahren zur Vermeidung von Gewebefehlern in Glatt- und Polgeweben
EP0950740A1 (fr) * 1998-03-21 1999-10-20 Günne Webmaschinenfabrik GmbH & Co. KG Procédé pour éviter des défauts de tissage et métier à tisse pour la mise en oeuvre de ce procédé

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2542335B1 (fr) * 1983-03-09 1985-08-02 Alsacienne Constr Mat Tex Procede et dispositif pour supprimer, sur les tissus, les defauts consecutifs a l'arret de la machine a tisser
DE3642913C2 (de) * 1986-12-16 1995-09-14 Kaiser Gmbh & Co Kg Verfahren zur Steuerung einer Webmaschine und Webmaschine zur Durchführung des Verfahrens

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