EP0816545B1 - Dispositif de détection d'une insertion de trame défecteueuse sur un métier à tisser à griffes - Google Patents

Dispositif de détection d'une insertion de trame défecteueuse sur un métier à tisser à griffes Download PDF

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Publication number
EP0816545B1
EP0816545B1 EP19960810439 EP96810439A EP0816545B1 EP 0816545 B1 EP0816545 B1 EP 0816545B1 EP 19960810439 EP19960810439 EP 19960810439 EP 96810439 A EP96810439 A EP 96810439A EP 0816545 B1 EP0816545 B1 EP 0816545B1
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EP
European Patent Office
Prior art keywords
sensor
weft
thread
accordance
sensors
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
EP19960810439
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German (de)
English (en)
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EP0816545A1 (fr
Inventor
Klaus Berktold
Godert Dr. De Jager
Frank Dr. Lehnert
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
Sulzer Textil 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 Sulzer Textil AG filed Critical Sulzer Textil AG
Priority to DE59604371T priority Critical patent/DE59604371D1/de
Priority to EP19960810439 priority patent/EP0816545B1/fr
Publication of EP0816545A1 publication Critical patent/EP0816545A1/fr
Application granted granted Critical
Publication of EP0816545B1 publication Critical patent/EP0816545B1/fr
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Expired - Lifetime legal-status Critical Current

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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
    • D03D47/38—Weft pattern mechanisms
    • 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
    • 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 invention relates to a device on a Rapier weaving machine to detect a faulty one Weft thread entry according to the generic term of Claim 1.
  • a device on a Rapier weaving machine to detect a faulty one Weft thread entry according to the generic term of Claim 1.
  • Such a device is known from CH-A-550 879.
  • Rapier weaving machines are particularly suitable for Production of a fabric comprising a large number different weft threads.
  • the individual weft threads are held by a thread mat and depending on Required presented to a gripper head, which the Grips weft and into the open shed registers.
  • a thread feeder device has Example eight, sixteen, or thirty-two threads on which each carry a weft. Through this Density of weft threads happens that a weft thread to be entered is adjacent to one arranged weft thread and this traveling, so that two or more at the same time Weft threads are entered in the shed. On such incorrect entry is also favored by that qualitatively with a rapier weaving machine different yarns can be woven into one fabric. So the fabric can be a thick, fibrous woolen yarn at the same time have a fine, smooth filament yarn.
  • Rapier weaving machine an economically advantageous Device for detecting a faulty one Propose weft entry.
  • the invention is achieved in particular by a Device on a rapier weaving machine for recognition an incorrect weft entry, which at least comprises two sensors for detecting a weft thread, sensors being arranged such that the first Sensor a weft thread that is between the submitted thread feeder and the hook head runs, monitors, and that the second sensor is arranged in this way is that an undesirably registered Weft thread that is essentially in between a basic position and the Gripper head runs, detectable by the second sensor is.
  • One advantage of the device according to the invention is that to see that with only two sensors a faulty one Weft thread entry recognizable on a rapier weaving machine is, the rapier weaving machine for any Number of different weft threads can be designed.
  • This device requires few components in particular also a few downstream of the sensors electronic evaluation devices, what a enables cost-effective execution.
  • the two sensor elements with the course of the weft threads no or only small thread deflection angles to design, so that an optimal thread running geometry is achievable.
  • a rapier weaving machine 1 shows a schematic view of a Rapier weaving machine 1, which uses a weft thread 8c a gripper 2 in the entry direction 3 in a shed registers.
  • a rapier weaving machine 1 has a plurality of thread feeders 7a, 7b, 7c, each one Lead weft 8a, 8b, 8c, and one each Present the weft 8c to the looper 2.
  • the thread feeder 7c in Direction of movement 9 lowered so that it is in a thread position 7c present position presents the weft 8c to the rapier head 2, which Gripper head 2 detects the weft 8c and in Entry direction 3 conveyed through the shed.
  • the remaining weft threads 8a, 8b are at one end of held a thread clamp 6, and run straight between the thread clamp 6 and the eyelets of the thread feeder 7a, 7b.
  • the warp threads 4a, 4b are also shown, the warp thread 4a being the outermost warp thread and is also referred to as a product edge 4a.
  • a first Sensor 5b and a second sensor 5a arranged, such that the weft thread 8c which is between the Thread feeder 7c and the hook head 2a runs, comes to lie directly in front of the sensor element 5b, so that the sensor element 5b the presence of the Can detect weft 8c.
  • the two sensors 5a, 5b are in a common sensor housing arranged one above the other.
  • Fig. 1b shows an incorrect weft insertion.
  • a Rapier weaving machine 1 allows weft threads 8a, 8b, 8c different thread quality and thread type to be entered. In particular, it can happen that adjacent weft threads due to e.g. protruding fibers or very light weight together impose. The one moving in the entry direction 3 Gripper head 2 grips the outside of the shed weft thread 8c. Another, unintentionally carried weft 8b is either gripped by the weft 8c or directly by the hook 2 and also entered in the open shed. This unintentionally carried weft 8b causes a web error, which is why this condition is considered an incorrect entry must be recognized.
  • the exemplary embodiment is the weft thread 8c to be entered submitted by the thread feeder 7c and runs between the Thread feeder 7c and the hook head 2. In this position the weft 8c is detected by the sensor 5b.
  • the unintentionally carried weft 8b runs between the one in a basic position Thread feeder 7b and the hook head 2 in one stretched alignment.
  • the sensor 5a is like this ordered that the unintentionally taken away Weft 8b runs directly in front of sensor 5a, see above that the unintentionally carried weft 8b from Sensor 5a is detectable. Another, yourself in one The basic position of the thread feeder 7a is shown, the weft 8a between the Thread feeder 7a and the thread clamp 6 runs.
  • a rapier weaving machine usually has a large number from e.g. 2, 4, 8, 16 or even 32 individual thread feeders 7a, 7b, 7c.
  • the sensor element 5a is such arranged that an accidentally taken away Weft 8b, which is always in between essentially in a basic position Thread feeder 7a, 7b and the hook head 2 runs, is detectable.
  • the sensor 5a is arranged in such a way that each of the weft threads 8b, which is between one of the for Example 32 is in the home position Thread feeders 7a, 7b, 7c and the hook head 2 run should be detectable. So one is enough Sensor 5a around all weft threads 8a, 8b, 8c with respect to one unintentionally carried weft 8b monitor.
  • 1c shows the intended, simultaneous entry of two weft threads 8b, 8c. It can be targeted with one two or more weft threads are woven, by a gripper 2 simultaneously two weft threads 8b, 8c are presented by thread feeders 7b, 7c, which both from the same gripper 2 in the open shed be entered. Even with this weaving process an unintentionally carried weft 8a detect easily by the sensor 5a.
  • Fig. 2 shows a perspective view of the already in 1a and 1b, according to the invention Contraption.
  • Fig. 2 shows an open shed with Warp threads 4a and the fabric 10.
  • the Weft thread 8a is presented by thread feeder 7c, and is through the hook head 2 and the thread clamp 6th held. The one moving in the entry direction 3
  • the gripper head 2 becomes the thread end of the weft thread 8a the thread clamp 6 pull and the weft 8a in the Enter the opened shed.
  • the electrical signal of the sensor 5b, 5a is electrical Connecting means 5c, 5d, not shown supplied electronic signal evaluation device.
  • the Thread feeder 7b is in the basic position and the weft 8b usually runs in a straight line between the thread feeder 7b and the thread clamp 6, such as this is represented by the weft 8d.
  • the weft 8b remained hang on the weft 8a, so that the through the Thread feeder 7c also weft 8a Pulls weft 8b into a lower position, causing the Weft thread 8b unintentionally caught by the hook head 2 and is taken away.
  • the weft 8b runs between the one in a basic position Thread feeder 7b, the hook head 2 and the thread clamp 6.
  • the sensor 5a is like this arranged that the straight line between the in Basic position of the thread feeder 7b and the Gripper head 2 running weft 8b immediately before runs past the sensor 5a and is detected by it can be so that the unintentionally taken away Weft 8b through the downstream electronic Circuit can be detected.
  • a corresponding one The error signal is generated and the rapier weaving machine 1 transmitted to interrupt the weft entry.
  • a thread guide 35 is arranged, which among other things serves an unintentional purpose to deflect the weft thread 8b, so that It is ensured that the weft 8b in the sensor 5a detectable area passes. Without one Thread guide element 35 there is a risk that the Weft 8b with the rapier inserted deep in the shed 2 comes to lie above the sensor 5a and thus from Sensor 5a can no longer be detected.
  • Fig. 3 shows a perspective view of another Design of the device according to the invention.
  • the two are different from the device according to FIG. 2
  • Sensors 5a, 5b arranged separately from each other, wherein the sensors 5a, 5b via electrical connection means 5c, 5d with an evaluation device, not shown are connected.
  • the one sensor 5b is again such arranged that one between which is in a submitted position located thread feeder 7c and the weft thread 8a running through the gripper head 2 Sensor 5b is detectable.
  • the second sensor 5a is arranged in such a way that a between the in the Basic position of the thread feeder 7b and Thread clamp 6 running weft 8d such that the weft thread runs at a distance from the sensor 5a 8d can no longer be detected by sensor 5a.
  • the sensor 5a is however arranged such that an unintentional entrained weft 8b, which between the in the basic position thread feeder 7b and Gripper runs, can be detected by sensor 5a.
  • the Presence of an accidentally taken away Weft 8b is about the electrical Connection means 5c, 5d of a downstream Evaluation device transmits which one corresponding trigger signal for the rapier weaving machine generated.
  • Next is a thread scissors at the fabric edge 4a 11 for cutting the weft threads 8a, 8b, 8d.
  • FIG. 4a shows a view of an optical sensor for Detecting a weft 8c. It is in one Housing 20 with partition 21 and a light emitting diode 22 a phototransistor 23 in the opposite chamber arranged. Those emitted by the LED 22 Rays emerge from the housing 20 through a window 24 are reflected by the weft 8c and kick through the window 24 back into the housing 20 where they are detected by the photo transistor 23. Is not a Weft 8c is present, so there is no reflection instead, so that with a photo transistor 23 downstream evaluation electronics clearly It can be determined whether a weft thread 8c is present or not.
  • FIG. 4b shows a view of a capacitive sensor, which is arranged in a housing 20.
  • the sensor has guide elements 33, an insulator 28, and in Center an electrostatic sensor 29, which over an electrically conductive cable 27 with a electronic evaluation device is connected.
  • electrostatically acting sensor 29 is able to uniquely detect a weft 8c.
  • the Weft 8c can rest on the housing, such as shown in which the thread 8c on the two Thread guides 33 rests.
  • the weft 8c can also be spaced from the housing and its presence be detected electrostatically.
  • FIG. 4c shows an embodiment of a piezoelectric sensor, which is in a housing 20 is arranged. Inside the sensor is a piezoelectric element 25 arranged, which in one Bearing body 26 and the housing 20 is mounted. At the Housing 20 are arranged thread guides 33. The piezoelectric element 25 also has one Thread guide 33. One on the thread guide 33 adjacent weft 8c exerts a force on the piezoelectric element 25 which generates a signal the one about the electric cable 27 is not shown electronic evaluation device is fed.
  • FIG. 5 shows a sensor 111 shown in section.
  • the weft thread 8c runs over the guide elements 103 and via the middle button 113.
  • the signal converter which a flexible plate 105 with measuring circuit 109 includes.
  • the flexible plate 105 is such in a body 106 made of elastic material, that the sensing element 113 on the flexible plate 105 works and bends it.
  • the measuring circuit 109 is as a bridge circuit consisting of Resistive elements designed, the electrical Signals over signal lines 118 and one Plug device 119 is guided to the outside. Since it is the sensor 111 is a force sensor Weft 8c always one against the feeler element exert effective force so that the weft 8c can be monitored.
  • Fig. 6a shows a rapier weaving machine with two as in Fig. 5 described force sensors.
  • Thread feeder 7c held in a presented position Weft thread 8c is made in the direction of entry 3 moving gripper 2 entered in the shed.
  • the sensor 111b between eyelet 36 and submitted thread feeder 7c arranged that the Weft 8c over the feeler 113 and the Guide elements 103 runs.
  • the weft 8c does not have the second sensor 111a.
  • the second sensor 111a is between a hook 35 and the one in a basic position, dashed illustrated thread feeder 7c arranged that the Weft 8c (shown in dashed lines) only over the second sensor 111a runs.
  • the sensors 111a, 111b are such with respect to the weft 8a, 8b, 8c arranged that the previously on the basis of the weft 8c explained arrangement applies to each of the weft threads. Consequently each runs from a thread feeder 7b, 7c Weft 8b, 8c via sensor 111b, respectively each of thread feeder 7b, 7c in a basic position held weft thread 8b, 8c runs over the sensor 111a.
  • 6b is another Possibility of arranging two sensors 111a, 111b shown which sensors according to the in Fig. 5th shown principle are built.
  • An advantage of one 6a, 6b can be seen in that the Thread tension throughout the weft insertion is measurable.
  • Another advantage of this arrangement is to be seen in the fact that the sensor 111a, 111b at any time a zero point calibration can be carried out.
  • a force sensor with a bridge circuit made up of resistance elements. This bridge circuit also allows low forces Measuring accurately, however, has the disadvantage of one Zero drift so that the sensor is always new must be calibrated by placing the sensor in a defined state is brought.

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

Claims (9)

  1. Dispositif à un métier à tisser à griffes (1) pour détecter une insertion de trame défectueuse, où le métier à tisser à griffes (1) comprend une tête de pince (2) et des organes de présentation de fil (7a, 7b, 7c), où le dispositif comprend au moins deux capteurs (5a, 5b) pour détecter un fil de trame (8a, 8b, 8c), lesdits capteurs (5a, 5b) étant disposés de façon que le premier capteur (5b) surveille un fil de trame présenté (8c) qui s'étend entre l'organe de présentation de fil présenté (7c) et la tête de pince (2), caractérisé en ce que le deuxième capteur (5a) est disposé de façon qu'un fil de trame (8b) inséré non intentionnellement qui s'étend entre un organe de présentation de fil (7a, 7b) se trouvant sensiblement dans une position de base et la tête de pince (2), puisse être détecté par le deuxième capteur (5a).
  2. Dispositif selon la revendication 1, caractérisé en ce que le premier capteur (5b) est disposé et configuré de façon que plusieurs fils de trame présentés (8a, 8b, 8c) puissent être détectés simultanément par le premier capteur (5b).
  3. Dispositif selon l'une des revendications 1 ou 12, caractérisé en ce que le premier et le deuxième capteur (5a, 5b) sont disposés l'un au-dessus de l'autre.
  4. Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que le premier et le deuxième capteur (5a, 5b) sont réalisés comme unités séparées.
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que les capteurs (5a, 5b) sont basés sur un principe de mesure optique, piézo-électrique, électrostatique ou magnétique.
  6. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que les capteurs (5a, 5b) sont réalisés pour mesurer une pression respectivement une tension du fil, et que les capteurs (5a, 5b) sont disposés de telle manière qu'un fil de trame (8a, 8b, 8c) saisi par la tête de pince (2) touche au moins temporairement le capteur (5a, 5b) pendant l'insertion du fil de trame.
  7. Dispositif selon la revendication 6, caractérisé en ce que le capteur (5a, 5b) est disposé de façon qu'un fil de trame (8a, 8b, 8c), par un actionnement de l'organe de présentation de fil (7a, 7b, 7c) puisse être éloigné du capteur (5a, 5b) pour amener le capteur (5a, 5b) d'une manière commandée dans un état non chargé.
  8. Dispositif selon la revendication 7, caractérisé en ce que le capteur (5a, 5b) est relié à un dispositif d'évaluation des signaux, présentant un dispositif d'étalonnage de point zéro, et en ce que l'organe de présentation de fil (7a, 7b, 7c) et le dispositif d'étalonnage de point zéro peuvent être commandés avec une coordination telle que dans le cas d'un capteur non chargé (5a, 5b), un étalonnage de point zéro puisse être effectué.
  9. Métier à tisser à griffes avec un dispositif selon l'une des revendications 1 à 8.
EP19960810439 1996-07-03 1996-07-03 Dispositif de détection d'une insertion de trame défecteueuse sur un métier à tisser à griffes Expired - Lifetime EP0816545B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59604371T DE59604371D1 (de) 1996-07-03 1996-07-03 Vorrichtung an einer Greiferwebmaschine zum Erkennen eines fehlerhaften Schussfadeneintrages
EP19960810439 EP0816545B1 (fr) 1996-07-03 1996-07-03 Dispositif de détection d'une insertion de trame défecteueuse sur un métier à tisser à griffes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19960810439 EP0816545B1 (fr) 1996-07-03 1996-07-03 Dispositif de détection d'une insertion de trame défecteueuse sur un métier à tisser à griffes

Publications (2)

Publication Number Publication Date
EP0816545A1 EP0816545A1 (fr) 1998-01-07
EP0816545B1 true EP0816545B1 (fr) 2000-02-02

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EP19960810439 Expired - Lifetime EP0816545B1 (fr) 1996-07-03 1996-07-03 Dispositif de détection d'une insertion de trame défecteueuse sur un métier à tisser à griffes

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EP (1) EP0816545B1 (fr)
DE (1) DE59604371D1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59906570D1 (de) * 1998-10-07 2003-09-18 Sultex Ag Rueti Webmaschine mit schussüberwachendem Eintragssystem für eine Vielzahl von verschiedenen Schussfäden
EP0995825B1 (fr) * 1998-10-07 2003-08-13 Sultex AG Métier à tisser avec un système d'insertion comportant un contrôle de la trame pour un nombre de fils de trame différente
EP1016744B1 (fr) * 1998-12-16 2003-07-09 Sultex AG Système et procédé pour régler le pince-fil d'une pince d'amenée et métier à tisser avec un tel système
DE59910006D1 (de) * 1999-01-12 2004-08-26 Sultex Ag Rueti Vorrichtung zum Abtrennen eines in ein Webfach einzutragenden Schussfadens und Webmaschine mit einer derartigen Vorrichtung
EP1020550B1 (fr) * 1999-01-12 2004-07-21 Sultex AG Dispositif pour séparer un fil de trame devant être inséré dans une foule, ainsi que métier à tisser équipé d'un tel dispositif
DE50015789D1 (de) 1999-09-23 2009-12-24 Itema Switzerland Ltd Webmaschine mit einem Eintragungssystem für eine Mehrzahl von in der Regel unterschiedlicher Schussfäden
EP1099784B1 (fr) * 1999-09-23 2009-11-11 ITEMA (Switzerland) Ltd. Métier à tisser avec système d'insertion pour une pluralité de fils de trame en règle générale différents
EP1350878B1 (fr) * 2002-04-02 2009-01-21 Gebrüder Loepfe AG Procédé pour surveiller le fil de trame dans un métier à tisser
DE102010047014A1 (de) * 2010-09-30 2012-04-05 Lindauer Dornier Gmbh Ermittlung der Fadenzugkräfte in mehreren Schussfäden einer Webmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1588264A (fr) * 1968-08-30 1970-04-10
CH550879A (de) * 1972-10-21 1974-06-28 Loepfe Ag Geb Verfahren zum gleichzeitigen abtasten zweier schussfaeden an einer schuetzenlosen webmaschine.
CH634885A5 (de) * 1979-01-29 1983-02-28 Loepfe Ag Geb Elektronische abtastvorrichtung zur schussueberwachung an einer greiferschuetzenwebmaschine mit farbwechselvorrichtung.
BE1001513A3 (nl) * 1988-03-16 1989-11-14 Picanol Nv Weefmachine, met een verbeterde voeding voor de inslagdraden.
DE19535895C1 (de) * 1995-09-27 1996-06-13 Dornier Gmbh Lindauer Einrichtung zum Reduzieren der Belastung eines in das Webfach einer Webmaschine einzutragenden Schußfadens

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Publication number Publication date
EP0816545A1 (fr) 1998-01-07
DE59604371D1 (de) 2000-03-09

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