EP0507739B1 - Dispositif pour empêcher des bandes en trames dans un métier à tisser - Google Patents

Dispositif pour empêcher des bandes en trames dans un métier à tisser Download PDF

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Publication number
EP0507739B1
EP0507739B1 EP92810234A EP92810234A EP0507739B1 EP 0507739 B1 EP0507739 B1 EP 0507739B1 EP 92810234 A EP92810234 A EP 92810234A EP 92810234 A EP92810234 A EP 92810234A EP 0507739 B1 EP0507739 B1 EP 0507739B1
Authority
EP
European Patent Office
Prior art keywords
loom
slow
rotation
slow rotation
warp
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
EP92810234A
Other languages
German (de)
English (en)
Other versions
EP0507739A1 (fr
Inventor
Masami C/O K.K. 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
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Filing date
Publication date
Application filed by Toyoda Jidoshokki Seisakusho KK, Toyoda Automatic Loom Works Ltd filed Critical Toyoda Jidoshokki Seisakusho KK
Publication of EP0507739A1 publication Critical patent/EP0507739A1/fr
Application granted granted Critical
Publication of EP0507739B1 publication Critical patent/EP0507739B1/fr
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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
    • 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
    • D03D51/005—Independent drive motors

Definitions

  • the present invention relates to apparatus for preventing weaving bar in a mispick recovery cycle in a loom according to the prior art portion of the independent claim 1.
  • a weaving bar in a mispick recovery cycle in a loom is caused by the slow forward or reverse rotation of the loom while the weaving operation of the loom is being interrupted.
  • the loom In case of a failure in a weft insertion, the loom has to be slowly rotated in a reverse rotation to open a shed for pick finding so that it may be released from that failure. By this release, the error weft can be removed from the cloth fell of a woven fabric.
  • the slow rotation for opening the shed for the pick finding to remove the error weft is accomplished either automatically or by turning on a slow inverse rotation control switch.
  • the disadvantage of this known apparatus is, that to avoid a weaving bar, a further rewinding of the warp beam to an extent equal to a predetermined fraction of the said average value of length of warp is necessary. Only by this predetermined fraction an accurate positioning of the weaving bar is possible. It is difficult to determine the value of the predetermined fraction of the said average value of length of warp.
  • a weft is subjected to a fine injection even while the weaving operation is being interrupted, so that it may be prevented from coming out of a weaving main nozzle.
  • the cut end of the error weft cut off may be brought from the weaving mainnozzle into the open shed by the fine injection.
  • the cut end in the open shed is grasped by the warp so that the shed has to be further opened, even after the automatic reverse rotation, for the pick finding by a slower rotation effected by the slow inverse rotation control switch.
  • the cloth fell of the woven fabric has to be positioned before re-starting the weaving operation of the loom by a slow forward rotation control switch. If, however, the amount of slow forward rotation necessary for positioning the cloth fell of the woven fabric is mistaken, the weaving bar occurs.
  • the present invention has an object to provide apparatus for preventing the weaving bar in a loom in case of a failure in a weft insertion.
  • the object is solved with an apparatus according to claim 1. It solves the problem in avoiding a weaving bar by an apparatus in which rotation of the loom at a slow rate to open a shed for pick finding and the displacement of the cloth fell of a woven fabric take place synchronously.
  • a control switch for the slow ration of the loom is provided in the apparatus.
  • the advantage offered by the invention is mainly, that positioning of the cloth fell of the woven fabric is possible without fail, to avoid a weaving bar.
  • the apparatus for preventing the weaving bar in the loom comprises: slow rotation control means for controlling the slow rotation of the loom; and slow rotation amount detecting means for detecting the amount of the slow rotation effected by the slow rotation control switch, and the slow rotation control means is given a function of storing the amount of the slow rotation detected by the detecting means and of rotating the loom in advance in reverse direction for an amount equal to the stored slow rotation amount at the time of re-starting the weaving operation of the loom.
  • the apparatus for preventing weaving bar in a loom comprises: slow rotation control means for controlling the slow rotation of the loom; slow rotation amount detecting means for detecting the amount of the slow rotation effected by the slow rotation control switch; and display means for displaying the amount of the slow rotation detected by the slow rotation amount detecting means.
  • the slow rotation control means is caused to store the amount of the slow rotation effected by the operation of the slow rotation control switch so that the loom is rotated in the reverse direction for an amount equal to the stored amount.
  • the cloth fell of the woven fabric is returned to its original position so that the it is accurately positioned.
  • the cloth fell of the woven fabric is returned to its original position if the reverse rotation is effected for the displayed amount of the slow rotation by turning on the slow rotation control switch.
  • Fig. 2 is a schematic side elevation showing the whole structure of a loom.
  • Reference letter M designates a loom motor which has its operation subjected to the control of a main control computer C o .
  • Numeral 1 designates a reversible feed motor which is independent of the loom motor M for driving a warp beam 2.
  • a warp T fed out of the warp beam 2 is guided through a back roller 3 and a tension roller 4 into a deformed reed 6.
  • a woven fabric W is taken up through an expansion bar 7, a surface roller 8, a press roller 9 and a smoothing guide member 10 by a cloth roller 11.
  • the tension roller 4 is carried at one end portion of a tension lever 12 so that a predetermined tension may be applied to the warp T by a tension spring 13 hooked on the other end portion of the tension lever 12.
  • This tension lever 12 is hinged to one end of a detection lever 14, which has its other end connected to a load cell 15.
  • the warp tension is transmitted through the tension roller 4, the tension lever 12 and the detection lever 14 to the load cell 15 so that the load cell 15 outputs an electric signal according to the warp tension to the main control computer C o .
  • the main control computer C o controls the rotational speed of the feed motor 1 on the basis of both the comparison between a predetermined tension and the detected tension grasped by the aforementioned input signal and the warp beam diameter grasped by a detection signal coming from a rotary encoder 16 for detecting the angle of rotation of the loom.
  • the warp tension in an ordinary operation is controlled to prevent the weaving bar in the loom during the weaving operation.
  • the main control computer C o commands the forward rotation of the feed motor 1 on the basis of an ON signal coming from a start switch 17 to control the rotational speed of the feed motor 1 in a feedback manner on the basis of a rotational speed detecting signal coming from a rotary encoder la built in the feed motor 1.
  • the surface roller 8 is operationally connected to a reversible take-up motor 18 which is independent of the loom motor M.
  • the main control computer C o controls the rotational speed of the take-up motor in a feedback manner on the basis of the rotational speed detecting signal coming from a rotary encoder 18a built in the take-up motor 18.
  • Fig. 1 is a schematic front elevation showing a weft inserting apparatus.
  • Numeral 19 designates a winding type weft metering reservoir. The weft metered and reserved by the weft metering reservoir 19 is inserted and injected from a weft inserting main nozzle 20.
  • a weft detector 21 At the terminal of the weft insertion, there is arranged a weft detector 21 having a reflection type photoelectric sensor for producing data for judging whether or not the weft insertion fails.
  • the let-off and stop of the weft from the winding face 19a of the weft metering reservoir 19 are effected by magnetizing and demagnetizing an electromagnetic solenoid 22 for driving a stop pin 22a.
  • the control of the magnetizing and demagnetizing the solenoid 22 is accomplished by a command coming from an auxiliary control computer C1.
  • This auxiliary control computer C1 control the magnetization/demagnetization of the electromagnetic solenoid 22 on the basis of the detected data of the angle of rotation of the loom obtained from the main control computer C o .
  • a weft let-off detector 23 made of a reflection type photoelectric sensor, which detects the weft being let off from the winding face 19a.
  • the auxiliary control computer C1 commands the demagnetization of the electromagnetic solenoid 22 when the detected number of let-off from the weft let-off detector 23 reaches a preset value, so that the stop pin 22a comes into engagement with the winding face 19a to block the left-off of the weft.
  • the weft thus inserted is cut off at each insertion, after it has been beaten, by a cutter 24.
  • an inserting air supply tube 25 and a breeze tube 26 To the inserting main nozzle 20, there are connected in parallel an inserting air supply tube 25 and a breeze tube 26.
  • This breeze tube 26 is supplied at all times with air under a low pressure so that the inserting main nozzle 20 finely injects in the operations other than the inserting injection.
  • This fine injection prevents the weft from coming out from the inserting main nozzle 20, and this prevention is carried out even when the weaving operation is interrupted.
  • a stop switch 27 In addition to the start switch 17, a stop switch 27, a slow reverse rotation switch 28 and a slow forward rotation switch 29 are connected with the main control computer C o .
  • Flow charts of Figs. 6 and 7 illustrate a slow rotation control program, on the basis of which the main control computer C o executes the slow rotation control in case the weft insertion fails. Upon this failure, the insertion of a succeeding weft is blocked, and the motors M, 1 and 18 have their operations stopped synchronously so that the deformed reed 6 is halted at a position immediately before the beating operation, as indicated by solid lines in Fig. 3. Reference letter Y indicates an error weft.
  • the motors M, 1 and 18 synchronously rotate at slow rates in reverse directions to bring the deformed reed 6 to the most retracted position of Fig. 4, and the warp T opens the largest shed.
  • the loom makes one and half rotations so that the deformed reed 6 moves to the position, as indicated by chains in Fig. 3, and swings one more reciprocation.
  • a weft Y2 having been inserted before the error weft Y is shifted by that automatic slow reverse rotation to the normal position P of the cloth fell of the woven fabric, as shown in Fig. 4.
  • the cut end portion Y1 of the error weft Y by the cutter 24 is subjected to the fine injection of the inserting main nozzle 20.
  • the cut end portion Y1 may enter the shed of the warps, while the deformed reed 6 makes one more reciprocal swing from the chained position of Fig. 3, until it may be grasped by the warps T, as shown in Fig. 4.
  • the cut end portion Y1 has to be extracted at first from the opened warp shed by turning on the slow reverse rotation control switch 28 to rotate the loom once and by pick-finding the cut end portion Y1.
  • the loom has to be rotated once more in the reverse direction by turning on the slow reverse rotation control switch 28, or the loom has to be rotated once in the forward direction by turning on the slow forward rotation control switch 29, so that the pick of the error weft Y may be found out.
  • the main control computer C o causes the motors M, 1 and 18 slowly in the synchronous manner in response to the slow reverse command which is produced by turning on the slow reverse rotation control switch 28, and stores the amount R of this slow reverse rotation on the basis of the rotation data coming from the rotary encoder 16.
  • the weft Y2 is displaced from the normal position P of the cloth fell of the woven fabric to the position of the cut end portion Y1 of Fig. 4.
  • the main control computer C o causes the motors M, 1 and 18 to rotate synchronously in the reverse directions, i.e., rotate slowly forward for the stored amount R of the slow reverse rotation.
  • the deformed reed 6 swings reciprocally twice from the position of Fig. 4 so that the weft Y2 inserted before the error weft Y is returned to the normal position P of the cloth fell of the woven fabric.
  • the main control computer C o rotates the loom slowly further for a predetermined amount in the reverse direction from that state.
  • the deformed reed 6 passes over the normal position P and stops at the position for re-starting the weaving operation immediately before the beating operation of Fig. 5, until the weaving operation is restarted from that state.
  • the weaving operation is restarted to cause no weaving bar, because the weft Y2 inserted before the error weft Y removed from the warp shed is in the normal position P of the cloth fell of the woven fabric.
  • a display unit 30 is connected with a main control computer C2 so that it may display the amount of slow forward/reverse rotations which are caused by turning of the slow reverse rotation control switch 28 and the slow forward rotation control switch 29.
  • the main control computer C2 the display unit 30 is caused to display the accumulated amounts of the slow forward/reverse rotations effected by the slow reverse rotation control switch 28 or the slow forward rotation control switch 29. When these amounts of slow forward and reverse rotations become equal, they are displayed at a value of zero.
  • the slow reverse rotation control switch 28 or the slow forward rotation control switch 29 may be turned on to display the amounts of the slow forward/reverse rotations at the zero value, thus ensuring the positioning of the cloth fell of the woven fabric.
  • the amount of slow rotation by the slow rotation control switch is reversed for re-starting the weaving operation so that the displacement of the cloth fell of the woven fabric caused by the operation of the slow rotation control switch is absorbed to provide an excellent effect that the positioning of the cloth fell of the woven fabric can be ensured to prevent the weaving bar in the loom.
  • the amount of the slow rotation by the operation of the slow rotation control switch is displayed.
  • the slow rotation control switch is so operated before the restart of the weaving operation as to display the amount of slow rotation at the value of zero, the displacement of the cloth fell of the woven fabric caused by the operation of the slow rotation control switch is absorbed to provide an excellent effect that the weaving bar in the loom caused by the operation of the slow rotation control switch can be prevented without fail.

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

Claims (7)

  1. Appareil pour prévenir une bande de tissage dans un cycle de récupération de fausse-duite dans un métier à tisser, dans lequel, à la suite de la détection d'une fausse-duite, on fait tourner le métier à faible vitesse afin d'ouvrir la foule pour rechercher la duite et, en déplaçant la chaîne (T), on commande la position (P) de la zone de battage d'une étoffe tissée (W) est commandée, ledit appareil comportant :
    des moyens d'entraînement (1) destinés à entraîner une ensouple (2) pour rebobiner ou relâcher la chaîne (T),
    des moyens d'entraînement (M) destinés à entraîner le métier tissé, caractérisé par des moyens de détection (16, 1a) destinés à détecter la valeur de ladite rotation lente du métier à tisser et dudit déplacement de la chaîne (T),
    des moyens (Co) de commande de rotation lente reliés aux moyens de détection (16, 1a) et commandant lesdits moyens d'entraînement (1, M), lesdits moyens (Co) de commande de rotation lente étant pourvus d'une fonction de mémorisation de la valeur de ladite rotation lente détectée par lesdits moyens de détection (16, 1a) et d'une fonction de rotation du métier à tisser dans un sens opposé d'une valeur égale à la valeur mémorisée de la rotation lente, et dans lequel les moyens (Co) de commande de rotation lente commandent les moyens d'entraînement (M) du métier à tisser et les moyens d'entraînement (1) de l'ensouple en synchronisme, afin que la rotation du métier à tisser et le déplacement de la position (P) de la zone de battage aient lieu en synchronisme.
  2. Appareil selon la revendication 1, comprenant en outre
    des moyens d'entraînement (18) destinés à entraîner une ensouple d'étoffe (11) afin de provoquer un rebobinage ou une libération de l'étoffe tissée (W),
    un moyen de détection (18a) destiné à détecter le déplacement de l'étoffe tissée (W),
    les moyens (Co) de commande de rotation lente étant également reliés au moyen (18a) de détection et aux moyens (18) d'entraînement de l'ensouple d'étoffe,
    les moyens (Co) de commande de rotation lente commandant la rotation des moyens (18) d'entraînement d'ensouple d'étoffe en synchronisme avec la rotation des moyens (M, 1) d'entraînement du métier à tisser et de la chaîne.
  3. Appareil selon l'une quelconque des revendications 1 à 2, dans lequel un commutateur (28, 29) de commande pour une commande marche avant/marche arrière pour ladite rotation lente du métier à tisser est prévu et est connecté aux moyens (Co) de commande de rotation lente.
  4. Appareil selon la revendication 3, dans lequel les moyens (Co) de commande de rotation lente comprennent des moyens d'affichage destinés à afficher la valeur de la rotation du métier à tisser à une faible vitesse et la valeur du déplacement de la position (P) de la zone de battage à une faible vitesse.
  5. Appareil selon l'une quelconque des revendications 1 à 4, comprenant en outre des moyens (4, 12, 14, 15, Co ; 1, 1a ; 18, 18a) destinés à mesurer et commander la tension de la chaîne.
  6. Appareil selon l'une quelconque des revendications 1 à 5, lesdits moyens (Co) de commande de rotation lente, destinés à commander une rotation lente vers l'arrière et vers l'avant, comprenant des moyens à calculateur programmable.
  7. Métier à tisser à jet d'air comportant un appareil selon l'une quelconque des revendications 1 à 6.
EP92810234A 1991-04-01 1992-03-30 Dispositif pour empêcher des bandes en trames dans un métier à tisser Expired - Lifetime EP0507739B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3068599A JP2906716B2 (ja) 1991-04-01 1991-04-01 織機における織段発生防止装置
JP68599/91 1991-04-01

Publications (2)

Publication Number Publication Date
EP0507739A1 EP0507739A1 (fr) 1992-10-07
EP0507739B1 true EP0507739B1 (fr) 1996-05-01

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Application Number Title Priority Date Filing Date
EP92810234A Expired - Lifetime EP0507739B1 (fr) 1991-04-01 1992-03-30 Dispositif pour empêcher des bandes en trames dans un métier à tisser

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EP (1) EP0507739B1 (fr)
JP (1) JP2906716B2 (fr)
DE (1) DE69210298T2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3318394B2 (ja) * 1993-06-02 2002-08-26 株式会社石川製作所 空気噴射式織機における運転再開方法
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
JP2004052148A (ja) * 2002-07-19 2004-02-19 Tsudakoma Corp 織機の誤運転防止装置
JP2004225172A (ja) * 2003-01-20 2004-08-12 Tsudakoma Corp 織段防止機能付き織機
JP4189249B2 (ja) * 2003-03-31 2008-12-03 津田駒工業株式会社 織機における織段防止装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1179857B (it) * 1984-12-10 1987-09-16 Ergotron Sas Di Dondi Benelli Dispositivo per ripristinare in un telaio tessile condizioni operative prestabilite alla ripresa del funzionamento dopo un interruzione in particolare dopo una rottura della trama
JP2894709B2 (ja) * 1988-12-28 1999-05-24 株式会社豊田中央研究所 経糸速度制御装置

Also Published As

Publication number Publication date
DE69210298T2 (de) 1996-11-28
DE69210298D1 (de) 1996-06-05
JP2906716B2 (ja) 1999-06-21
JPH04308258A (ja) 1992-10-30
EP0507739A1 (fr) 1992-10-07

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