EP0769581A1 - Dispositif pour réduire la charge d'un fil de trame devant être inséré dans la foule d'un métier à tisser - Google Patents

Dispositif pour réduire la charge d'un fil de trame devant être inséré dans la foule d'un métier à tisser Download PDF

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Publication number
EP0769581A1
EP0769581A1 EP96113964A EP96113964A EP0769581A1 EP 0769581 A1 EP0769581 A1 EP 0769581A1 EP 96113964 A EP96113964 A EP 96113964A EP 96113964 A EP96113964 A EP 96113964A EP 0769581 A1 EP0769581 A1 EP 0769581A1
Authority
EP
European Patent Office
Prior art keywords
weft
thread
tension
shed
tension sensor
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.)
Granted
Application number
EP96113964A
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German (de)
English (en)
Other versions
EP0769581B1 (fr
Inventor
Heinz-Peter Löhr
Rainer Schuster
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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Publication date
Application filed by Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0769581A1 publication Critical patent/EP0769581A1/fr
Application granted granted Critical
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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

Definitions

  • the invention relates to a device for reducing the load on a weft thread to be inserted into the shed of a loom according to the preamble of claim 1.
  • a device for controlling or regulating the tension of weft threads consisting of a weft brake assigned to each weft thread type to be entered in the shed, a weft guard downstream of each brake, which serves as a tension sensor, and each tension sensor with an electronic control unit is connected in which tension setpoints with that of each tension sensor, e.g. over the entry time, the actual tension values recorded are compared and, in the event of a deviation, the weft brake concerned receives a signal for changing the braking force.
  • the object of the invention is to influence the tension of the respective weft thread during the weft insertion in such a way that both tension peaks and tension troughs are largely avoided.
  • a further task consists of minimizing the number of weft monitors used as tension sensors, irrespective of the number of weft threads to be entered, while guaranteeing a functionally reliable tension measurement based on tension force.
  • the object is achieved in that the plurality of weft thread types to be entered in a shed depending on the pattern is assigned only one weft monitor acting as a thread tension sensor between the weft selector and the entrance to the shed in a first arrangement level.
  • the weft thread to be inserted is brought into contact with the thread tension sensor by its compulsory entrainment by the weft thread insertion element over the insertion time or in relation to the angle of rotation of the main loom shaft.
  • the course of the thread tension is thus continuously recorded during the weft thread insertion.
  • This traction force curve is primarily determined by the dynamics of the weaving cycle and its absolute size is dependent on the braking force set for the weft thread brakes upstream of the sensor.
  • a second thread tension sensor in a second arrangement level between the first tension sensor and the weft thread selection device.
  • the second thread tension sensor can be brought into contact with a second weft thread tension sensor on the way of passing the weft thread from the weft thread selector to the weft thread insertion element.
  • the second tension sensor does not detect the course of the thread tension over the entry time or over a certain angle of rotation of the main shaft, but the course of the tension force when the weft thread is passed to the entry member. This ensures that the course of the thread tension between the thread brakes and the selection device is detected during the handover process and that the maximum and minimum tension can be reacted to.
  • the device according to the invention has the compared to the prior art Advantage that only two thread tension sensors are required for all of the weft thread types to be entered in the shed and therefore all tension values are directly comparable with one another. Another advantage is that all thread brakes can be compared with each other with the help of the two sensors. It is also advantageous that the braking force control on each weft brake can in principle be achieved with only the first thread tension sensor if the tension peak during acceleration of each weft thread is determined by a computing process from the course of the thread tension of a first weft thread entry.
  • the first weft sensor present in the first arrangement level is also effective as a weft monitor, because it monitors the weft for its tension over the entire width of the shed and the absence of a signal can be evaluated as a weft break.
  • a weft insertion element 3 which can be moved alternately into and out of the shed 1, is carried by a guide 4.
  • the guide 4 is designed similar to an angle profile and has an inner one Base surface 4a and an inner side guide surface 4b for the entry member 3.
  • the weft 6 to be entered into the shed 1 is placed over a weft brake 7 with an actuating element 7a and a weft selector 8 with a hand-in needle 8a to the insertion member 3 and held by a thread clamp, not shown, until the weft is held by the entry member 3 is included.
  • the hand-over needle 8a is one of a plurality of such needles of a weft selector 8.
  • the inserted weft thread 6 is beaten by a reed 9 at the binding point 10 of the fabric 11 by a pivoting movement according to the double arrow 12 to form the fabric 11 and cut by an installed pair of scissors 13.
  • a first thread tension sensor 14 is arranged on the hook guide 4 in a first arrangement level between the shed 1 or between a catch bar 15 of a hand-in needle 8a in such a way that after the weft 6 has been taken over by the entry element 3 and the weft 6 has subsequently been inserted into the shed 1 each weft 6 is in contact with the sensor 14 for the time of entry and detects the thread tension prevailing in the weft 6 between the weft brake 7 and the entry member 3 and feeds it via line 16 to the electronic control and comparator unit 17 as an electrical signal. If the electronic comparator 17 detects deviations from a desired or desired thread tension, an electrical signal for regulating the braking force is triggered via the line 18 leading to an actuating element 7a of the weft brake 7.
  • the second thread tension sensor 19 is provided in a second arrangement level on the guide 4, specifically in a region between the first thread tension sensor 14 and the weft thread selection device 8.
  • the relevant weft thread 6 is fed through the needle 8a, it is temporarily deflected over the upper edge 4b 'of the side surface 4b of the guide 4, see FIG. 2.
  • the hand-over needle 8a is in position A with the weft thread.
  • the sensor 19 covers the area of the temporary deflection of each weft thread 6. Due to the deflection, the thread tensile force when the thread is passed can be detected within a certain angular range of the weaving machine main shaft, because the weft thread 6 rests in the area of the sensor 19 and is not moved.
  • the detected thread tensile forces are communicated via line 20 to the control and comparator unit 17 as electrical signals.
  • the sensor 19 can detect the tension caused by the acceleration of the weft 6 when the insertion member takes over the weft 6 due to the existing deflection.
  • the hand-over needle 8a is moved into position B after the weft thread 6 has been taken over by the entry member 3. As a result, the weft thread 6 loses contact with the sensor 19. Due to the movement of the entry element 3 into the shed 1, the weft thread 6 is applied to the sensor 14 with a time delay and is likewise deflected there. He now has contact with the sensor 14 until the weft thread entry is complete and the reed 9 lifts the weft thread 6 from the sensor 14 due to its stop movement.
  • This procedure serves to optimize the braking force curve on a rapier weaving machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP96113964A 1995-09-27 1996-08-31 Dispositif pour réduire la charge d'un fil de trame devant être inséré dans la foule d'un métier à tisser Expired - Lifetime EP0769581B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19535895 1995-09-27
DE19535895A DE19535895C1 (de) 1995-09-27 1995-09-27 Einrichtung zum Reduzieren der Belastung eines in das Webfach einer Webmaschine einzutragenden Schußfadens

Publications (2)

Publication Number Publication Date
EP0769581A1 true EP0769581A1 (fr) 1997-04-23
EP0769581B1 EP0769581B1 (fr) 1999-12-29

Family

ID=7773296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96113964A Expired - Lifetime EP0769581B1 (fr) 1995-09-27 1996-08-31 Dispositif pour réduire la charge d'un fil de trame devant être inséré dans la foule d'un métier à tisser

Country Status (4)

Country Link
US (1) US5725029A (fr)
EP (1) EP0769581B1 (fr)
JP (1) JP2859589B2 (fr)
DE (2) DE19535895C1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816545B1 (fr) * 1996-07-03 2000-02-02 Sulzer Textil Ag Dispositif de détection d'une insertion de trame défecteueuse sur un métier à tisser à griffes
IT1283381B1 (it) * 1996-07-31 1998-04-17 Roj Electrotex Nuova Srl Procedimento per controllare l'inserimento del filo di trama in un telaio di tessitura.
US6253795B1 (en) 1998-03-14 2001-07-03 Stephan Kuster Tensioning apparatus and method for an interlaced thread
DE59908000D1 (de) * 1998-09-02 2004-01-22 Sultex Ag Rueti Verfahren und System zum Eintragen eines Schussfadens in einer Greiferwebmaschine
EP0984089B1 (fr) * 1998-09-02 2003-12-10 Sultex AG Procédé et dispositif pour l'insertion d'un fil de trame dans un métier à tisser à griffes
DE29909242U1 (de) 1999-05-27 1999-09-16 Dornier Gmbh Lindauer Schussfadenbremse für Webmaschinen
SE521331C2 (sv) * 1999-12-07 2003-10-21 Texo Ab Anordning vid fournissör
DE10218059A1 (de) * 2002-04-23 2003-11-13 Dornier Gmbh Lindauer Vorrichtung und Verfahren zur Regelung der Fadenspannung eines Fadens bei Textilverarbeitungsmaschinen
DE102007005859A1 (de) * 2007-02-06 2008-08-07 Siemens Ag Vorrichtung zum Erkennen eines mechanischen Defekts in einem Draht einer Oberleitung
DE102010047014A1 (de) 2010-09-30 2012-04-05 Lindauer Dornier Gmbh Ermittlung der Fadenzugkräfte in mehreren Schussfäden einer Webmaschine
ITUB20155266A1 (it) * 2015-10-30 2016-01-30 Roj S R L Freno elettromagnetico pilotato per il controllo della tensione dei fili di trama in macchine tessili
EP3967801A1 (fr) * 2020-09-11 2022-03-16 Picanol Dispositif et procédé de détection d'une tension dans un fil, et procédé de montage d'une unité de capteur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2212907A1 (de) * 1971-04-08 1972-10-19 Rydborn S A O Fadenwaechter an Greiferwebstuehlen
CH550879A (de) * 1972-10-21 1974-06-28 Loepfe Ag Geb Verfahren zum gleichzeitigen abtasten zweier schussfaeden an einer schuetzenlosen webmaschine.
FR2447416A1 (fr) * 1979-01-29 1980-08-22 Loepfe Ag Geb Dispositif de detection electronique pour surveiller les fils de trame d'un metier a tisser a pinces comportant un appareil de changement de couleurs
EP0333302A1 (fr) * 1988-03-16 1989-09-20 Picanol N.V. Machine à tisser à alimentation de fil de trame modifiée
EP0357975A2 (fr) * 1988-09-08 1990-03-14 NUOVA VAMATEX S.p.A. Système de contrôle de la tension de la trame fournie à un métier à tisser à alimentation en trame continue

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1265071B1 (it) * 1993-05-18 1996-10-30 Nuovo Pignone Spa Dispositivo di regolazione continua della sensibilita' di tastazione, nel controllo di inserzione trama in un telaio tessile
BE1007850A3 (nl) * 1993-12-01 1995-11-07 Picanol Nv Werkwijze en weefmachine met een voeding voor inslagdraden.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2212907A1 (de) * 1971-04-08 1972-10-19 Rydborn S A O Fadenwaechter an Greiferwebstuehlen
CH550879A (de) * 1972-10-21 1974-06-28 Loepfe Ag Geb Verfahren zum gleichzeitigen abtasten zweier schussfaeden an einer schuetzenlosen webmaschine.
FR2447416A1 (fr) * 1979-01-29 1980-08-22 Loepfe Ag Geb Dispositif de detection electronique pour surveiller les fils de trame d'un metier a tisser a pinces comportant un appareil de changement de couleurs
EP0333302A1 (fr) * 1988-03-16 1989-09-20 Picanol N.V. Machine à tisser à alimentation de fil de trame modifiée
EP0357975A2 (fr) * 1988-09-08 1990-03-14 NUOVA VAMATEX S.p.A. Système de contrôle de la tension de la trame fournie à un métier à tisser à alimentation en trame continue

Also Published As

Publication number Publication date
DE19535895C1 (de) 1996-06-13
JP2859589B2 (ja) 1999-02-17
EP0769581B1 (fr) 1999-12-29
JPH09209243A (ja) 1997-08-12
US5725029A (en) 1998-03-10
DE59604026D1 (de) 2000-02-03

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