EP0962566B1 - Procédé pour contrôler l'opération de libération et d'arrêt du fil de trame sur les dispositifs de stockage de fil dans les métiers à tisser - Google Patents

Procédé pour contrôler l'opération de libération et d'arrêt du fil de trame sur les dispositifs de stockage de fil dans les métiers à tisser Download PDF

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Publication number
EP0962566B1
EP0962566B1 EP99109509A EP99109509A EP0962566B1 EP 0962566 B1 EP0962566 B1 EP 0962566B1 EP 99109509 A EP99109509 A EP 99109509A EP 99109509 A EP99109509 A EP 99109509A EP 0962566 B1 EP0962566 B1 EP 0962566B1
Authority
EP
European Patent Office
Prior art keywords
characteristic feature
time
stopping device
weft thread
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
EP99109509A
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German (de)
English (en)
Other versions
EP0962566A3 (fr
EP0962566A2 (fr
Inventor
Adnan Dr. Wahhoud
Dieter Teufel
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.)
Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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Filing date
Publication date
Application filed by Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0962566A2 publication Critical patent/EP0962566A2/fr
Publication of EP0962566A3 publication Critical patent/EP0962566A3/fr
Application granted granted Critical
Publication of EP0962566B1 publication Critical patent/EP0962566B1/fr
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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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the invention relates to a method for monitoring the weft release and Stopping process on pre-winding devices, in particular with air jet looms in Active connection.
  • the main nozzle of the air jet weaving machine and the prewinder are electrically controlled in such a way that the thread stopper of the prewinder releases the weft length synchronously with the electrical control of the electromagnetic control valve of the main nozzle and the thread stopper blocks the weft release at the end of the weft insertion process.
  • This necessary or defined weft thread length is achieved in that the diameter of the drum of the prewinder is adjustable and thus picks up and releases an integer number of turns which corresponds to the weft thread insertion length.
  • Known designs of prewinding devices have at least one thread stopper which can be moved radially to the drum diameter and thereby releases or stops the weft thread.
  • the at least one stop device is actuated electromagnetically directly or also indirectly in connection with the switching of an electromagnetically actuated valve of the main nozzle.
  • the synchronous operation of the electromagnetic stopper device of the prewinder and the solenoid valve of the main nozzle of an air jet weaving machine requires, as can be seen from EP 0 544 730 B1, that both the times for releasing and stopping the weft thread and the operating times of the main nozzle are in agreement or are within reasonable limits.
  • the state of the art does not monitor whether the necessary conditions for synchronous operation continue to exist during web operation.
  • the weft between the pre-winder and the main nozzle is subjected to a relatively high thread tension.
  • this thread tensile force can lead to a so-called weft thread break during the aforementioned relatively short period of time or as the weft thread insertion process continues.
  • DE 196 02 513 C1 discloses a method for monitoring the functionality of electrically controllable solenoid valves in weaving machines.
  • the background to the invention is that a possible failure of the pneumatically operated and electrically controllable auxiliary units used in weaving machines can be recognized at an early stage.
  • all electromagnetic systems including electrically controlled solenoid valves, have a characteristic curve of the control current (I) over time (t).
  • the special characteristic of the control current (I) over time (t) is shown in the rising part of a curve as a brief current drop. This current drop occurs regularly when the magnetic circuit is closed in an electromagnetic system.
  • the object is achieved in accordance with the method steps known per se. solved the invention according to DE 196 02 513 C1. Thereafter, the characteristic current profile of a device consisting of a coil, a spring-loaded stopper and a first and second position signal transmitter for the stopper is now also detected when the electromagnetic stopper device of a pre-winding device is electrically actuated. It is essential to the invention that the brief drop in the control current, which occurs regularly when the magnetic circuit in an electromagnetically operated system is closed, is measured over time in the ascending part of a curve and is shown in a diagram.
  • the occurrence of this transient current slump at the time of actuation is with a t ⁇ t 1 defined as a target value and with a determined actual value ⁇ t 1 'compared.
  • the determined actual value .DELTA.t 1 ' lies outside the predetermined time .DELTA.t 1 (setpoint) or a predetermined time window (setpoint range)
  • an error message is generated in the control of the weaving machine, which leads to the interruption of the weaving process.
  • the actuation time of the stopper device can be moved according to the invention in the sense of an advance or delay.
  • the weft thread is released electromagnetically by the stopper device spring-loaded stopper, so in an embodiment of the invention to control the Stop function generates a path or position signal.
  • a path or position signal for this come e.g. as a means Photoelectric sensors, initiators, Hall sensors and the like in question.
  • the characteristic feature of the brief drop in the control current (I) occurs both when the thread stopper releases and when the weft thread is stopped.
  • the first or second characteristic feature can optionally be used for monitoring the switching time of the stopper device.
  • the control current I is plotted on the ordinate and the time t of the effective control current of a stop device connected to a direct current source VDC or a thread braking device of a spooling device 1 according to FIG. 3, not shown, is plotted on the abscissa.
  • the current profile in an electromagnetic system, such as the stopper or thread braking device is known. Accordingly, it is also known, the current characteristic curve 1 that in the ascending part 1a, a brief current slump after driving the stopper or a t yarn braking device yields at a time .DELTA.t 1 2 as a characteristic feature of such a curve. 1
  • This characteristic feature 2 occurs when the magnetic circuit of the stop device consisting of at least the coil 7 and the stopper 4 or the magnetic circuit of the thread brake device, not shown, closes.
  • the occurrence of the characteristic feature 2 'at a time ⁇ t 1' , its deviation in time and size compared to a characteristic feature 2 at a time ⁇ t 1 or the absence of characteristic feature 2 is an indicator of the functionality of the above-mentioned devices of a prewinding device or an indicator of harmful asynchrony in the interaction between the weft insertion system of the weaving machine and the prewinding device third
  • the characteristic feature 2 at ⁇ t 1 of curve 1 according to FIG. 1 is monitored, for example, by a peak value detection.
  • the detection signal is forwarded to a measuring circuit 10 known per se, see also FIG. 2.
  • the characteristic feature 2 at ⁇ t 1 is represented when each stopper device or each thread brake is activated (switched on) by means of a weaving machine control not specified here.
  • the relevant control device of the weaving machine receives a signal which either indicates the absence of the characteristic feature 2 in the control stream 1 of the stopper device or the thread braking device and / or triggers an interruption of the weaving process.
  • a measured actual value .DELTA.t 1 ' for the occurrence of the characteristic feature 2' is shown as an example on the abscissa according to FIG.
  • This actual time period ⁇ t 1 ' and / or the actual control current curve 1' is recorded as a measured value.
  • These measured values are compared with the reference values in the comparator 13 according to FIG. 2.
  • a measured difference value and / or one of two compared with each other curves 1 and 1 are each' 1 resulting difference in the appearance of the characteristic feature 2 or 2 'is the point in time a t, which corresponds to the activation time of the stopper device 4, 7 according to FIG.
  • ⁇ t 1 and ⁇ t 1 ' are corrected. It is important that at least the difference between ⁇ t 1 and ⁇ t 1 ' does not exceed or fall below a predetermined tolerance range. If, for example, the tolerance range is determined to be exceeded in the course of the operating time of the prewinding device 1, this is indicated by a signal relating to this, which can be associated with the interruption of the weaving process.
  • the prewinder 3 shown schematically in FIG. 3 has a drum 3a, on which a weft thread 5 drawn off from a thread spool, not shown, is wound.
  • the weft thread 5 is drawn off from the drum 3a overhead by a weft thread insertion member, not shown, via a thread guide 8.
  • the weft insertion element is the main nozzle.
  • the weft thread insertion member is controlled in such a way that the stopper device, consisting of the bobbin 7, the thread stopper 4 loaded with a spring 4a and the at least one detection device 6, or for example a thread braking device arranged in the pulling direction of the weft thread, see arrow direction 9, synchronously weft thread 5 released with the control of the main nozzle and blocked at the end of the weft insertion on the drum 3a and, if necessary, a thread braking device brakes the weft.
  • the stopper device and the yarn braking means are provided with known per se in Figure 2 means 10,11,12,13 and 14 in connection to the means of a desired-actual value comparison between at least the sizes .DELTA.t 1 and At 1 'information on To achieve synchronization of the switching times between the solenoid valve of the main nozzle and the at least one stopper device of a pre-winding device 3 working with the weaving machine.

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

Claims (9)

  1. Procédé de contrôle du processus de lancement et d'arrêt du fil de trame sur des bobinoirs préliminaires pour machines à tisser, selon lequel de préférence un dispositif d'arrêt à action électromagnétique commande par intermittence, au moyen d'une commande électrique, le lancement d'un nombre entier prédéfini de tours de fil de trame à un instant prédéfini dans une machine à tisser et arrête par intermittence le lancement du fil de trame, caractérisé en ce que, pendant la commande électrique du dispositif d'arrêt, un indice caractéristique (2) connu en soi apparaissant dans la courbe du courant de commande (I) pendant le temps (t) est utilisé comme une grandeur significative du bon fonctionnement du bobinoir préliminaire (3).
  2. Procédé selon la revendication 1, caractérisé en ce que l'absence de l'indice caractéristique (2) ou un décalage dans le temps constaté pour l'indice caractéristique est signalé à la commande de la machine à tisser.
  3. Procédé selon la revendication 1, caractérisé en ce que la fonction correcte du lancement du fil de trame est contrôlée au moyen d'une comparaison entre les valeurs de consigne et les valeurs réelles, entre l'indice caractéristique (2) apparaissant à un instant Δt1 et l'indice caractéristique apparaissant à un instant Δt1' différent de l'instant Δt1.
  4. Procédé selon la revendication 1, caractérisé en ce que la fonction correcte de l'arrêt du fil de trame est générée par un signal de position déclenché par un stoppeur (4).
  5. Procédé selon la revendication 4, caractérisé en ce que la fonction d'arrêt du stoppeur (4) est assurée par le retour mécanique du stoppeur.
  6. Procédé selon la revendication 1, caractérisé en ce que, en cas d'utilisation d'aimants d'inversion de levage pour le dispositif d'arrêt, le contrôle des mouvements de levage du stoppeur (4) est assuré au choix, soit au moyen de l'indice caractéristique (2) pendant le lancement du fil de trame (5), soit au moyen de l'indice caractéristique pendant l'arrêt du fil de trame (5).
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'une divergence répétée entre l'instant Δt1, et l'instant Δt1' est interprétée comme une usure du dispositif d'arrêt et génère un message correspondant.
  8. Machine à tisser, en particulier machine à tisser à jet d'air comprenant un système d'insertion du fil de trame formé par au moins une buse principale et une pluralité de buses secondaires, la buse principale et les buses secondaires étant en liaison avec des vannes magnétiques à commande électrique, comprenant au moins un bobinoir préliminaire (3) muni de préférence d'un dispositif d'arrêt du fil de trame électromagnétique à commande électrique, caractérisée en ce que pour le contrôle du bon fonctionnement des vannes magnétiques, un indice caractéristique (2) connu en soi, apparaissant dans le courant de commande des vannes magnétiques est utilisé pour une comparaison entre les valeurs de consigne et les valeurs réelles, et en ce que, outre l'utilisation de l'indice caractéristique (2) destiné à contrôler les vannes magnétiques, l'indice caractéristique (2) apparaissant dans le courant de commande (I) du dispositif d'arrêt du fil de trame est utilisé pour contrôler le bon fonctionnement du dispositif d'arrêt du fil de trame, et en ce qu'au moins l'indice caractéristique (2) destiné à contrôler la vanne de la buse principale et l'indice caractéristique (2) destiné à contrôler le dispositif d'arrêt sont contrôlés dans une commande de machine à tisser en vue de constater la coïncidence temporaire existante et un signal d'erreur est généré pour un affichage et/ou la déconnexion de la machine à tisser lorsqu'au moins un indice caractéristique (2) se situe en dehors d'une fenêtre de coïncidence temporaire.
  9. Machine à tisser selon la revendication 8, caractérisée en ce que le moment de la coïncidence ou la fenêtre de la coïncidence temporaire correspond à un angle de rotation ou à une zone d'angle de rotation de l'arbre principal de la machine à tisser.
EP99109509A 1998-06-02 1999-05-12 Procédé pour contrôler l'opération de libération et d'arrêt du fil de trame sur les dispositifs de stockage de fil dans les métiers à tisser Expired - Lifetime EP0962566B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19824613A DE19824613A1 (de) 1998-06-02 1998-06-02 Verfahren zum Überwachen des Schußfadenfreigabe- und Stoppvorganges an Vorspulgeräten für Webmaschinen
DE19824613 1998-06-02

Publications (3)

Publication Number Publication Date
EP0962566A2 EP0962566A2 (fr) 1999-12-08
EP0962566A3 EP0962566A3 (fr) 2001-05-23
EP0962566B1 true EP0962566B1 (fr) 2003-10-29

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EP99109509A Expired - Lifetime EP0962566B1 (fr) 1998-06-02 1999-05-12 Procédé pour contrôler l'opération de libération et d'arrêt du fil de trame sur les dispositifs de stockage de fil dans les métiers à tisser

Country Status (4)

Country Link
US (1) US6176272B1 (fr)
EP (1) EP0962566B1 (fr)
JP (1) JPH11350301A (fr)
DE (2) DE19824613A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0100509L (sv) * 2001-02-16 2002-02-05 Texo Ab Förfarande och anordning för att längdmäta och magasinera tråd vid väv- eller textilmaskiner
DE10151780C1 (de) * 2001-10-19 2003-05-22 Dornier Gmbh Lindauer Verfahren und Vorrichtung zur Beeinflussung der Fadenbremskraft einer zwischen einem Garnvorratssystem und einem Fadenspeicher einer Webmaschine angeordneten Schussfadenbremse
US7614948B2 (en) * 2003-09-15 2009-11-10 Igt Multi-player bingo with slept awards reverting to progressive jackpot pool
US7398431B2 (en) * 2004-12-20 2008-07-08 Emc Corporation System and method of dynamically setting a fault threshold for an operational module
JP7260387B2 (ja) * 2019-05-06 2023-04-18 津田駒工業株式会社 水噴射式織機における緯入れ方法及び装置

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Publication number Priority date Publication date Assignee Title
CS179657B1 (en) 1975-06-10 1977-11-30 Juraj Spisiak Wiring of apparatus for controlling active elements of weft inserting duct in jet weaving machines
JPS58208446A (ja) 1982-05-31 1983-12-05 津田駒工業株式会社 ジエツトル−ム用よこ糸検知方法
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JP2701545B2 (ja) * 1990-12-29 1998-01-21 株式会社豊田自動織機製作所 ジェットルームにおける緯入れ用圧力制御装置
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Also Published As

Publication number Publication date
EP0962566A3 (fr) 2001-05-23
DE19824613A1 (de) 1999-12-09
DE59907506D1 (de) 2003-12-04
EP0962566A2 (fr) 1999-12-08
US6176272B1 (en) 2001-01-23
JPH11350301A (ja) 1999-12-21

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