EP0407824A2 - Dispositif pour mesurer la tension de la chaîne d'un métier à tisser et utilisation du dispositif comme casse-chaîne - Google Patents

Dispositif pour mesurer la tension de la chaîne d'un métier à tisser et utilisation du dispositif comme casse-chaîne Download PDF

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Publication number
EP0407824A2
EP0407824A2 EP90112388A EP90112388A EP0407824A2 EP 0407824 A2 EP0407824 A2 EP 0407824A2 EP 90112388 A EP90112388 A EP 90112388A EP 90112388 A EP90112388 A EP 90112388A EP 0407824 A2 EP0407824 A2 EP 0407824A2
Authority
EP
European Patent Office
Prior art keywords
warp
sensor
tension
sensors
sensing element
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.)
Withdrawn
Application number
EP90112388A
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German (de)
English (en)
Other versions
EP0407824A3 (en
Inventor
Martin Plaschy
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.)
Zellweger Uster AG
Original Assignee
Zellweger Uster 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 Zellweger Uster AG filed Critical Zellweger Uster AG
Publication of EP0407824A2 publication Critical patent/EP0407824A2/fr
Publication of EP0407824A3 publication Critical patent/EP0407824A3/de
Withdrawn legal-status Critical Current

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    • 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
    • D03D51/20—Warp stop motions
    • D03D51/28—Warp stop motions electrical
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/12—Controlling warp tension by means other than let-off mechanisms
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/18—Devices for indicating warp tension

Definitions

  • the invention relates to a device for measuring the warp tension on weaving machines, with a sensing element for the warp tension, or a size proportional to it, which extends over the weaving width and is partially wrapped by the warp threads.
  • warp tension regulators are used, the measurement of the warp tension being an essential factor for their correct operation.
  • Control variables are derived from the measured warp tension with which organs for influencing the warp tension can be controlled accordingly.
  • the invention is now intended to provide a device which, on the one hand, reacts as slowly as possible to warp tension fluctuations and, on the other hand, enables the detection of warp tension differences across the weaving width.
  • this object is achieved in that the said sensing element has sensors arranged next to one another for measuring the tension of the warp threads applied to the respective sensor, and that the measured tension is evaluated for each sensor.
  • the sensing element is thus divided into a number of individual sensors, which reduces the inertia of the system accordingly and enables a rapid reaction to small and locally limited voltage fluctuations.
  • Each of the individual sensors is only wrapped with a small number of warp threads, so that even small warp threads fluctuations in tension can be measured, and the course of the warp tension over the weaving width can also be seen.
  • the invention further relates to the use of said device for the detection of warp thread breaks.
  • slats are used today, one slat per warp thread. If a warp thread breaks, the slat in question falls down onto a rail-shaped slat guide and thereby makes contact, by means of which the weaving machine is stopped.
  • slats have a number of disadvantages: - For weight reasons, slats of different thickness and length must be used for different warp materials. - Because of the thickness of the slats, they must be distributed over several, usually six, rows of slats to ensure that the slats do not interfere with each other when they fall down. - In the case of very dense warps, for example with 15 denier warp threads, six rows of slats are not sufficient, and eight or even twelve rows of slats must be used.
  • the first two rows of slats on the leaf side can be attached to the underside of the slat bars beat, which creates a sharp burr on the slats, which can lead to additional warp thread breaks. Slats damaged in this way can also cause problems during later pull-in processes.
  • the invention is intended to open up the possibility of replacing the conventional warp guard slats with a system which does not have the disadvantages listed.
  • the main idea of the solution according to the invention is therefore to measure the tension for a specific warp thread group in a defined area of the chain and to interpret a sudden decrease in the measured warp tension as a break in a warp thread of the respective warp thread family.
  • the number of threads of a warp thread group applied to a sensor is selected so that the change in the total tension of the thread group caused by the breakage of a warp thread is still clearly recognizable and thus reliably detectable.
  • the detection of a warp thread break by a sensor also serves to locate the broken warp thread and makes it easier to repair.
  • a weaving machine consists in a known manner of a warp beam 1, from which the warp threads 2 are fed to the fabric stop edge 6 by a warp let-off device 3 via a match tree 4 and a shedding device 5.
  • the weft threads inserted into the shed 7 formed by the shedding device 5 are struck by an oscillating driven sley 8 on the fabric stop edge 6.
  • the fabric formed in this way and designated by the reference number 9 is drawn off in a known manner by a take-off roller over a breast tree and wound up on a fabric tree (fabric take-off and take-up are not shown).
  • the match tree 4 is equipped with a sensing element F for measuring the warp tension and / or for detecting warp thread breaks; the sensing element F is assigned a tensioning roller 10 arranged in the running direction of the warp threads 2 directly in front of the match tree 4. This serves to give the warp threads 2 wrapping around the sensing element F a basic tension that is as uniform as possible.
  • the tensioning roller 10 can be designed as a static tensioning tree provided with a brake lining or as a driven brush roller, which preferably rotates in the opposite direction to the unwinding direction of the warp beam 1 and thus in the opposite direction to the transport direction of the warp threads 2.
  • the brush roller has the additional advantage that any warp threads that have been sized are separated from it.
  • the sensing element F either forms part of the match tree 4 and is installed, for example, in its casing, or it is supported on the match tree by suitable holding means and supported by the latter. If a denotes the angle between the plane of the warp threads 4 running towards the match tree 4 and the central plane of the warp threads 2 running off the latter, then the sensing element F is preferably positioned along a generatrix of the jacket of the match beam 4 in the bisector a / 2. As a rule, the position of the sensing element F is not changed during the weaving process; when changing the warp, it is advantageous to rotate the sensing element F with or without the match tree 4 by 180 °, so that it is free of warp threads 2.
  • FIG. 2 shows a detail of the weaving machine from FIG. 1 in the area of the match tree 4 and FIG. 3 shows a view shown as a development in the direction of the arrow III from FIG. 2.
  • Sensing element F is formed by sensors S1 to Sn lined up next to one another for measuring the force exerted by the respective warp threads 2 on the sensor.
  • the sensors S1 to Sn are piezoelectric sensors, piezo foils or strain gauges; it is also possible to use capacitive sensors. In this case, and also when using strain gauges, each sensor would have to be spring-mounted, so that the force measurement could take place by determining the adjustment path of the sensors.
  • the individual sensors S1 to Sn are separated from one another by separating elements T, which ensure that the number of warp threads per sensor is constant. These separating elements can as in Fig. 3 on a separate holder 11, or they can also directly on the sensing element F, between the individual Sensors S1 to Sn must be installed.
  • the distance between adjacent separating elements T is 1 to 2 cm, the separating elements T are lamella-like and have a thickness of approximately 0.2 to 0.3 mm. These values are to be understood as guidelines.
  • a rack or a worm shaft can also be used to subdivide the warp threads 2.
  • the sensors S1 to Sn can have separate sensitivity areas or they can be overlapping, with rectangular, triangular or trapezoidal sensitivity areas. An interpolation of the sensor signals is then advantageously carried out during the evaluation.
  • Fig. 4 shows an enlarged section of the sensing element F, namely Fig. 4a shows a view in the direction of arrow III of Fig. 2 and Fig. 4b shows a section along the line AA of Fig. 4a.
  • the sensing element F has a rail-shaped holder 12 for the sensors S1, S2, and that the sensors S1, S2 are arranged slightly overlapping and offset from one another along two rows in the holder 12.
  • Each sensor S consists of a base element 13 and a bracket-like contact element 14 carried by it, on which the warp threads 2 rest.
  • the contact surface of the contact element 14 projects beyond the Holder 12 slightly, preferably by about 0.3 mm.
  • the contact element 14 is a U-shaped bracket with a wall thickness of approximately 0.2 to 0.5 mm.
  • the warp tensile force P is in cN per warp thread on the ordinate and the time t is entered in thousandths of a second on the abscissa.
  • the leaf stop at which the warp thread tension reaches a maximum is designated with B in each case.
  • the force measurement per sensor S1 to Sn (FIG. 3) takes place over a defined suitable range of less than or equal to 360 ° each weaving cycle. Instead of the force, the area hatched in FIG. 5 can also be evaluated.
  • the optimal length of the measuring range is preferably determined empirically, since it is influenced by various factors, such as, for example, weaving machine type, warp thread material, warp tension, speed of the weaving machine, temperature, air humidity, and the like.
  • the evaluation and control is shown schematically in FIG. One recognizes the sensors S1 to Sn, the outputs of which are connected to a digitizing stage 15, which contains an amplifier and an analog / digital converter.
  • the digitization stage 15 contains one output 16 per sensor S1 to Sn, which is connected to an evaluation stage 17, from which corresponding outputs 18 to a control unit 19 to lead.
  • Another output 20 of the evaluation stage 17 leads to a higher-level data system for process control and process monitoring.
  • the control unit 19 has three outputs 21 to 23, of which the output 21 leads to the warp let-off device 3 and the output 22 leads to the drive M of the weaving machine WM.
  • the output 23 leads to a display bar 24 for broken warp threads.
  • This display bar 24 preferably has a display for each sensor S1 to Sn, for example a lamp L1 to Ln, so that it is immediately displayed from which sensor a warp thread break has been detected, which considerably facilitates the repair of broken warp threads.
  • the display bar 24 can be arranged above the chain at an easily visible location, but it can also be integrated in the sensing element F (FIG. 3). In the latter case, each sensor S1 to Sn would have a lamp L1 to Ln.
  • the warp let-off device 3 (FIG. 1) is regulated via the line 21 on the basis of a target / actual comparison of the predetermined and the measured warp tension. If the warp thread breaks, the weaving machine WM is stopped via line 22.
  • a reference value of the warp tension is formed for each sensor and stored in the evaluation stage 17. If a warp thread breaks, a correspondingly smaller force is measured. If this falls below the reference value only a certain predetermined amount, then this is interpreted as detection of a warp thread break and the weaving machine is stopped via line 22. If, after the break has been repaired, the relevant warp thread is inadvertently inserted into an adjacent measuring zone, ie assigned to a different sensor, no problem arises because new reference values are formed when the weaving machine is restarted.
  • the measured values can also be added.
  • a reference value for the sensor S1 then for the sensors S1 + S2, and so on, would be formed in the evaluation stage 17 and compared with the corresponding measured values.
  • Another possibility is to evaluate the extreme values (amplitudes) or characteristic turning points of the signal.
  • the extraordinary advantage of the device described is that the conventional warp guard slats can be dispensed with. This means that the device can also be used as a pure detector for warp thread breaks. Of course, the use for controlling the warp let off also offers advantages, especially when you consider that the warp let off is still not solved satisfactorily. Finally, the force measurement with the individual sensors also opens up the possibility of fine adjustment of each warp thread group per sensor, which can be of particular importance in the area of the edge warp threads on the fabric bar.
EP19900112388 1989-07-11 1990-06-29 Warp tension monitoring device on a loom and the use of the device as warp stop motion Withdrawn EP0407824A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH259589A CH681465A5 (fr) 1989-07-11 1989-07-11
CH2595/89 1989-07-11

Publications (2)

Publication Number Publication Date
EP0407824A2 true EP0407824A2 (fr) 1991-01-16
EP0407824A3 EP0407824A3 (en) 1992-01-02

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Family Applications (1)

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EP19900112388 Withdrawn EP0407824A3 (en) 1989-07-11 1990-06-29 Warp tension monitoring device on a loom and the use of the device as warp stop motion

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EP (1) EP0407824A3 (fr)
CH (1) CH681465A5 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552793A1 (fr) * 1992-01-24 1993-07-28 Tsudakoma Kogyo Kabushiki Kaisha Système de détection des ruptures du fil de chaîne
EP0562214A1 (fr) * 1992-03-27 1993-09-29 Sulzer RàœTi Ag Métier à tisser avec des ensouples sectionnelles
US5649569A (en) * 1994-12-13 1997-07-22 Sulzer Rueti Ag Warp tension measuring apparatus
EP0717135A3 (fr) * 1994-12-13 1999-05-12 Sulzer RàœTi Ag Dispositif de mesure de la tension de chaíne sur un métier à tisser
CZ303018B6 (cs) * 2011-08-10 2012-02-29 Technická univerzita v Liberci Zpusob a zarízení k merení tkacího odporu na tkacím stroji
ITMI20120340A1 (it) * 2012-03-06 2013-09-07 Btsr Int Spa Dispositivo e metodo di alimentazione di fili di ordito ad un telaio
CN109281044A (zh) * 2018-12-05 2019-01-29 浙江理工大学 断经自停的综丝综眼检测装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1006644A (fr) * 1947-12-29 1952-04-25 Maison Neyret Machine pour l'industrie textile avec casse-fil perfectionné
DE1928430A1 (de) * 1968-06-15 1969-12-18 Algemene Kunstzijde Unie Nv Verfahren und Vorrichtung zum Feststellen von Stoerungen bei der Bewegung eines endlosen Materials
DE2206781A1 (de) * 1971-02-26 1972-09-14 Weefautomaten Picanol, naamloze vennootschap (Metiers automatiques Picanol, S.A.), leper (Belgien) Verfahren zum Abwickeln von Kettenfaden ab einem Kettenbaum in einem Webstuhl, sowie Kettenabwickler für die Durchführung dieses Verfahrens
FR2207501A5 (fr) * 1972-11-21 1974-06-14 Loepfe Ag Geb
FR2277757A1 (fr) * 1974-07-12 1976-02-06 Loepfe Ag Geb Dispositif de surveillance de produits filiformes, notamment sur machines textiles
GB2048319A (en) * 1979-04-25 1980-12-10 Sulzer Ag Warp yarn stop motion of a weaving loom
DE3146635A1 (de) * 1981-11-25 1983-07-07 W. Schlafhorst & Co, 4050 Mönchengladbach Fadenueberwachungsaggregat zum fuehren und ueberwachen einer laufenden fadenschar
DE3215760A1 (de) * 1982-04-28 1983-11-03 W. Schlafhorst & Co, 4050 Mönchengladbach Automatische vorrichtung zum abwickeln und/oder aufwickeln parallellaufender faeden
WO1988004644A1 (fr) * 1986-12-15 1988-06-30 Nippon Selen Co., Ltd. Detecteur de fils casses

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1006644A (fr) * 1947-12-29 1952-04-25 Maison Neyret Machine pour l'industrie textile avec casse-fil perfectionné
DE1928430A1 (de) * 1968-06-15 1969-12-18 Algemene Kunstzijde Unie Nv Verfahren und Vorrichtung zum Feststellen von Stoerungen bei der Bewegung eines endlosen Materials
DE2206781A1 (de) * 1971-02-26 1972-09-14 Weefautomaten Picanol, naamloze vennootschap (Metiers automatiques Picanol, S.A.), leper (Belgien) Verfahren zum Abwickeln von Kettenfaden ab einem Kettenbaum in einem Webstuhl, sowie Kettenabwickler für die Durchführung dieses Verfahrens
FR2207501A5 (fr) * 1972-11-21 1974-06-14 Loepfe Ag Geb
FR2277757A1 (fr) * 1974-07-12 1976-02-06 Loepfe Ag Geb Dispositif de surveillance de produits filiformes, notamment sur machines textiles
GB2048319A (en) * 1979-04-25 1980-12-10 Sulzer Ag Warp yarn stop motion of a weaving loom
DE3146635A1 (de) * 1981-11-25 1983-07-07 W. Schlafhorst & Co, 4050 Mönchengladbach Fadenueberwachungsaggregat zum fuehren und ueberwachen einer laufenden fadenschar
DE3215760A1 (de) * 1982-04-28 1983-11-03 W. Schlafhorst & Co, 4050 Mönchengladbach Automatische vorrichtung zum abwickeln und/oder aufwickeln parallellaufender faeden
WO1988004644A1 (fr) * 1986-12-15 1988-06-30 Nippon Selen Co., Ltd. Detecteur de fils casses

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552793A1 (fr) * 1992-01-24 1993-07-28 Tsudakoma Kogyo Kabushiki Kaisha Système de détection des ruptures du fil de chaîne
EP0562214A1 (fr) * 1992-03-27 1993-09-29 Sulzer RàœTi Ag Métier à tisser avec des ensouples sectionnelles
US5305802A (en) * 1992-03-27 1994-04-26 Gebrueder Sulzer Aktiengesellschaft Drive adjustment device for sectional warp beam let-off motion
US5649569A (en) * 1994-12-13 1997-07-22 Sulzer Rueti Ag Warp tension measuring apparatus
EP0717135A3 (fr) * 1994-12-13 1999-05-12 Sulzer RàœTi Ag Dispositif de mesure de la tension de chaíne sur un métier à tisser
CZ303018B6 (cs) * 2011-08-10 2012-02-29 Technická univerzita v Liberci Zpusob a zarízení k merení tkacího odporu na tkacím stroji
ITMI20120340A1 (it) * 2012-03-06 2013-09-07 Btsr Int Spa Dispositivo e metodo di alimentazione di fili di ordito ad un telaio
WO2013132312A2 (fr) 2012-03-06 2013-09-12 Btsr International S.P.A. Dispositif et procédé permettant d'alimenter des fils de chaîne sur un métier à tisser
WO2013132312A3 (fr) * 2012-03-06 2014-05-08 Btsr International S.P.A. Dispositif et procédé permettant d'alimenter des fils de chaîne sur un métier à tisser
CN109281044A (zh) * 2018-12-05 2019-01-29 浙江理工大学 断经自停的综丝综眼检测装置
CN109281044B (zh) * 2018-12-05 2024-01-30 浙江理工大学 断经自停的综丝综眼检测装置

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Publication number Publication date
EP0407824A3 (en) 1992-01-02
CH681465A5 (fr) 1993-03-31

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