EP0245236B1 - Procede et dispositif de mesure de la tension de la chaine dans des metiers automatiques et similaires - Google Patents

Procede et dispositif de mesure de la tension de la chaine dans des metiers automatiques et similaires Download PDF

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Publication number
EP0245236B1
EP0245236B1 EP85904080A EP85904080A EP0245236B1 EP 0245236 B1 EP0245236 B1 EP 0245236B1 EP 85904080 A EP85904080 A EP 85904080A EP 85904080 A EP85904080 A EP 85904080A EP 0245236 B1 EP0245236 B1 EP 0245236B1
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EP
European Patent Office
Prior art keywords
vibrating device
fabric
threads
tension
vibrating
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
Application number
EP85904080A
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German (de)
English (en)
Other versions
EP0245236A1 (fr
Inventor
Ernst Felix
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
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Zellweger Uster AG
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Filing date
Publication date
Application filed by Zellweger Uster AG filed Critical Zellweger Uster AG
Priority to AT85904080T priority Critical patent/ATE47435T1/de
Publication of EP0245236A1 publication Critical patent/EP0245236A1/fr
Application granted granted Critical
Publication of EP0245236B1 publication Critical patent/EP0245236B1/fr
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/40—Applications of tension indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • warp tension regulators The measurement of the warp tension on weaving machines and the like is an essential factor for keeping them constant by means of warp tension regulators.
  • a constant warp tension is crucial for a perfect failure of the fabric. For this reason, methods and devices have always been used to measure this warp tension and to derive control variables from the measured value, with which organs can be controlled to influence the warp tension.
  • the most original way of measuring the warp tension and converting it into a measurement signal is to use the force exerted on a deflection element, which acts on the match tree from the entire chain (see, for example, DE-A-2206781).
  • the disadvantages of this measurement of the total warp tension are above all the large masses to be moved, which, however, only result in a relatively small deflection of the spring-loaded match tree.
  • Another disadvantage is that the total number of warp threads is used for force measurement, whereas differences in warp tension across the width of the warp thread family are not expressed.
  • the warp thread family is preferably locally partially set into resonance vibrations, be it by connecting an auxiliary mass with a part of the warp threads and stimulating this system to vibrate, or be it that the warp threads are vibrated alone.
  • the thread tension can be determined from the resulting resonance frequency and the known mass of the warp threads according to the principle of the vibrating string. This method solves the problem of zero point constancy.
  • the present invention now relates to a method for measuring the warp tension on the chain and / or on the fabric in textile machines and the like, which is characterized by the features listed in claim 1.
  • the invention also includes an apparatus for performing the method with the features according to claim 10.
  • the chain 10 to be checked with regard to its tension or the fabric 11 is normally clamped between transport elements, such as, for example, rear cylinder rollers 1, 2 and front cylinder rollers 3, 4.
  • a vibrating element 20 is attached between these clamping lines. This causes a rotational oscillation around the axis.
  • the oscillating member 20 can rotate on its axis, on the one hand, and on the other hand, when it is deflected from the straight line, a restoring force arises which is proportional to the deflection and the tension.
  • Formula (1) which can be derived mathematically, shows that the voltage can be determined from the resonance frequency.
  • a vibrating element 20 In contact with the chain 10 or the fabric 11, a vibrating element 20 is rotatably mounted about a central axis 23. So that the web always lies against the vibrating element, the web is slightly deflected upwards. In other words, the material web (chain 10 or fabric 11) lies on the vibrating element 20 under the influence of the tension P.
  • the vibrating element 20 can also be designed as a rotatably mounted plate, the contact surface 24 with the web (10, 11) being advantageously treated as a wear-resistant surface (FIG. 3). This method is suitable for. B. in weaving and in equipment.
  • parts of the processing machine can also be used for supporting the chain or the fabric, such as, for example, warp beam, match beam, breast beam of the weaving machine or squeeze rollers, deflection rollers of the sizing machine, etc.
  • the vibrating element 20 is used in the machine in an area where the distance between the support and the vibrating element is variable, e.g. B. with radially resilient deflection rollers of the sizing machine.
  • a special case is the measurement of the fabric tension on the weaving machine.
  • the breast tree 12 (FIG. 4) is a precisely defined contact surface.
  • the fabric stop edge 13 forms an apparent point of contact when the shed is open.
  • the distance between the vibrating element and the edge of the goods is also defined in this way. However, when the compartment is closed, the point of contact moves into the harness. If the dimensions of the vibrating organ are small in relation to the distance of the vibrating organ from the edge of the goods or from the harness, the influence of this variable distance becomes negligible.
  • variable a is several times larger than c, and thus the quotient - in relation (1) - only makes a negligibly small contribution to the summand
  • FIG. 4 also shows a possible mounting of the vibrating element 20 by means of a cutting edge 27 and a notch 26 stamped into the vibrating element.
  • the material web 10, 11 holds the vibrating element 20 firmly on the cutting edge 27.
  • the vibrating organ should also have a significantly larger mass in relation to the goods. With different weft densities in the fabric, the different fabric weight does not interfere.
  • the vibrating element 20 is now excited with its resonance frequency.
  • Methods for exciting mechanical vibration structures are known. As a rule, these consist of a drive element, feedback element and amplifier.
  • an electromechanical excitation arrangement 30 according to FIG. 2 with the aid of an electromagnet causes a deflection of the vibrating element 20 about the axis 23.
  • Known inductive, capacitive, optical or pneumatic distance meters with subsequent amplifiers can be used as feedback means.
  • a drive coil 31 and a feedback coil 32 with amplifier 33 are required.
  • the vibrating element vibrates automatically at the resonance frequency.
  • the resulting frequency f o of the vibrating element 20 is directly dependent on the tension P of the material web resting on the vibrating element 20, according to the relationship of formula (1).
  • formula (1) only applies if the deflection angle a around the oscillating plate is very small and the pivot point of the vibrating element lies completely against the product (FIG. 5). Otherwise the swinging motion is no longer perpendicular to the goods plane. If the chain 10 or the fabric 11 adhere to the vibrating member by friction, changes in the length of the sections a and b and thus tensile forces of the chain or the fabric occur. There are therefore additional forces which are dependent on the size of the deflection, as a result of which Formula 1 is no longer valid and the force measurement is therefore no longer accurate.
  • the fulcrum can also be deliberately placed outside the intersection 14, whereby vibrations (which are never exactly constant) are excited when the chain 10 or fabric 11 is moving.
  • the frequency of this vibration is close to the resonance frequency.
  • the vibration system can be made to vibrate by means of a sensor 34 and a transducer 35, the frequency f o that is established and the force P can be determined from this frequency.
  • the vibrating member 20 can have rotatably mounted rollers 21, 22 so that minimal friction between the chain or fabric and the vibrating member 20 occurs (FIG. 9). This process is preferably used in sizing and finishing.
  • Formula (1) also only applies exactly if the center of gravity of the oscillating structure at the pivot point, i. H. lies in the longitudinal axis 23 (FIG. 10).
  • a counterweight 25 can be attached to an axis of symmetry 28 laid by the oscillating member 20.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Looms (AREA)

Abstract

Pour mesurer la tension d'une nappe d'ourdissage (10) ou d'une chaîne (11) dans un métier automatique ou similaire, un organe vibratoire (20) pivotable autour d'un axe (23) est agencé de telle façon dans la région de la nappe de tissu (nappe d'ourdissage 10 ou 11) qu'il est facile de dévier la nappe de tissu de la ligne droite. L'organe vibratoire (20) est mis en vibration par un agencement excitateur (30). La fréquence (fo) résultante de l'organe vibratoire (20) dépend directement de la tension P de la nappe d'ourdissage ou du tissu et peut ainsi être déduite de la fréquence fo. L'organe vibratoire (20) peut être amené, par simple glissement de la nappe d'ourdissage (10) ou du tissu (11) sur sa surface (24), à vibrer selon une vibration et une fréquence fo propres pouvant être mesurées par un senseur (34) et un convertisseur (35). On obtient une construction particulièrement avantageuse de l'organe vibratoire (20) en lui donnant la forme d'une plaque pourvue d'une encoche (26) posée sur une lame (27). Pour éliminer des vibrations propres de l'organe vibratoire (20), celui-ci peut être pourvu d'un contrepoids (25) qui transfère le centre de gravité du système au point d'intersection des efforts de traction exercés par la nappe d'ourdissage ou le tissu.

Claims (19)

1. Procédé pour mesurer la tension d'un groupe de fils ou d'un tissu, caractérisé en ce que dans les domaines du groupe de fils (10) ou du tissu (11) à mesurer concernant leur tension est disposé un organe oscillant (20) au-dessus duquel passe le groupe de fils (10) ou le tissu (11 ) et en ce que la tension (P) du groupe de fils ou du tissu est déterminée à partir de la fréquence de résonance (fo) de l'organe oscillant (20).
2. Procédé selon la revendication 1, caractérisé en ce que l'organe oscillant (20) est excité en des oscillations autour de son axe longitudinal au moyen d'un dispositif d'excitation (30) électromécanique à contre-réaction.
3. Procédé selon la revendication 1, caractérisé en ce que l'organe oscillant (20) est excité en vibrations sous l'influence de la nappe de tissu (groupe de fils 10 ou tissu 11 ) glissant au-dessus de lui, lesquelles vibrations sont converties en signaux électriques d'une fréquence (fo) au moyen d'un capteur (34) et d'un convertisseur (35).
4. Procédé selon la revendication 1, caractérisé en ce que le groupe de fils (10) ou le tissu (11) est dévié de la ligne droite par l'organe oscillant (20).
5. Procédé selon la revendication 4, caractérisé en ce que le centre de rotation réel ou apparent de l'organe oscillant (20) est placé au moins approxi- mativementau point d'intersection (14) des forces de traction déviées de la nappe de tissu.
6. Procédé selon la revendication 1, caractérisé en ce que le groupe de fils (10) ou le tissu (11) est conduit sur des galets (21,22) qui sont logés dans l'organe oscillant (20).
7. Procédé selon la revendication 1, caractérisé en ce que le groupe de fils (10) ou le tissu (11 ) est conduit sur une surface (24) de l'organe oscillant (20).
8. Procédé selon la revendication 1, caractérisé en ce que l'organe oscillant (20) est équilibré au moyen d'un contrepoids (25).
9. Procédé selon la revendication 1, caractérisé en ce que la masse de rotation de l'organe oscillant (20) est choisie grande par rapport à la masse correspondante du groupe de fils (10) ou du tissu (11 ).
10. Dispositif pour la mise en œuvre du procédé selon la revendication 1, caractérisé en ce qu'un organe oscillant (20) qui est logé de façon rotative autour d'un axe longitudinal central (23) est prévu, en ce que le groupe de fils (10) ou le tissu (11 ) est en contact avec l'organe oscillant (20) et en ce que l'organe oscillant (20) est déplaçable suivant un mouvement oscillant autour de l'axe longitudinal cité (23).
11. Dispositif selon la revendication 10, caractérisé en ce que le groupe de fils (10) ou le tissu (11) est dévié de la ligne droite par l'organe oscillant (20).
12. Dispositif selon les revendications 10 et 11, caractérisé en ce que l'organe oscillant (20) présente des galets (21, 22) logés de façon rotative.
13. Dispositif selon les revendications 10 et 11, caractérisé en ce que l'axe longitudinal (23) de l'organe oscillant (20) est formé par une entaille (26) et un couteau (27).
14. Dispositif selon la revendication 13, caractérisé en ce que le couteau (27) est disposé à l'extrémité d'un ressort (29) fixé d'un côté.
15. Dispositif selon les revendications 10 et 11, caractérisé en ce que l'organe oscillant (20) présente une surface (24) résistant à l'usure tournée vers le groupe de fils (10) ou le tissu (11 ).
16. Dispositif selon la revendication 10, caractérisé en ce que l'organe oscillant (20) est équilibré au moyen d'un contrepoids (25) par rapport à l'axe longitudinal (23).
17. Dispositif selon la revendication 10, caractérisé en ce que l'organe oscillant (20) est disposé dans le domaine d'un dispositif d'excitation électromécanique (30).
18. Dispositif selon la revendication 17, caractérisé en ce que le dispositif d'excitation électromécanique (30) présente une bobine oscillante (31 ), une bobine de contre-réaction (32) et un oscillateur/amplificateur (33).
19. Dispositif selon la revendication 10, caractérisé en ce qu'à l'organe oscillant (20) est associé un capteur (34) avec un convertisseur (35) qui convertit en signaux électriques les vibrations de l'organe oscillant (20) excité en oscillations propres par le groupe de fils (10) ou le tissu (11 ).
EP85904080A 1985-07-26 1985-08-27 Procede et dispositif de mesure de la tension de la chaine dans des metiers automatiques et similaires Expired EP0245236B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85904080T ATE47435T1 (de) 1985-07-26 1985-08-27 Verfahren und vorrichtung zur messung der kettspannung an webmaschinen und dergleichen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3255/85 1985-07-26
CH3255/85A CH668443A5 (de) 1985-07-26 1985-07-26 Verfahren und vorrichtung zur messung der spannung einer fadenschar oder eines gewebes an einer textilmaschine.

Publications (2)

Publication Number Publication Date
EP0245236A1 EP0245236A1 (fr) 1987-11-19
EP0245236B1 true EP0245236B1 (fr) 1989-10-18

Family

ID=4252020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85904080A Expired EP0245236B1 (fr) 1985-07-26 1985-08-27 Procede et dispositif de mesure de la tension de la chaine dans des metiers automatiques et similaires

Country Status (6)

Country Link
US (1) US4794802A (fr)
EP (1) EP0245236B1 (fr)
JP (1) JPS63500472A (fr)
CH (1) CH668443A5 (fr)
DE (1) DE3573810D1 (fr)
WO (1) WO1987000562A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905881C2 (de) * 1989-02-25 1999-08-19 Dornier Gmbh Lindauer Vorrichtung zum Messen der Kettspannung in einer Webmaschine
WO1999045282A2 (fr) * 1998-03-05 1999-09-10 NORD, Klaus-Jürgen Procede et dispositif pour la surveillance de la zone de corps de roulement techniques
US20030066362A1 (en) * 2001-08-29 2003-04-10 Lee Shih Yuan Seat belt tension sensor
CN104389090B (zh) * 2014-11-14 2016-08-24 广东丰凯机械股份有限公司 经纱张力采集装置
CN110186607A (zh) * 2019-06-14 2019-08-30 无锡先导智能装备股份有限公司 张力检测装置及其震动触发器
CN110186608A (zh) * 2019-06-14 2019-08-30 无锡先导智能装备股份有限公司 电堆打包钢带张力检测设备及其张力检测装置
EP4164971A1 (fr) * 2021-04-05 2023-04-19 Purdue Research Foundation Systèmes et procédés de mesure de distribution de tension dans des bandes de processus rouleau à rouleau

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923150A (en) * 1957-12-16 1960-02-02 American Viscose Corp Tension measuring apparatus
US3040565A (en) * 1960-01-07 1962-06-26 David A Church Film stress transducer
FR1407184A (fr) * 1964-06-17 1965-07-30 Inst Textile De France Capteur de tension des fils de chaîne sur métier à tisser
FR1540535A (fr) * 1967-09-06 1968-09-27 Casse-fil perfectionné
BE768521R (nl) * 1971-02-26 1971-11-03 Weefautomaten Picanol N V Meti Kettingafwinder voor
SU391388A1 (ru) * 1971-10-25 1973-07-25 Белорусский филиал Энергетического института Г. М. Кржижановского Устройство для измерения линейной массы движущейся стеклонити
CH551922A (de) * 1972-11-21 1974-07-31 Loepfe Ag Geb Vorrichtung zum ueberwachen laufender faeden.
SU446781A1 (ru) * 1973-03-22 1974-10-15 Предприятие П/Я А-3593 Устройство дл измерени нат жени магнитной ленты
JPS5016585A (fr) * 1973-06-09 1975-02-21
BE901112A (nl) * 1984-11-22 1985-03-15 Ginderachter Marcel Van Een systeem om de trekspanning van de pooldraden bij weefgetouwen te kontroleren.

Also Published As

Publication number Publication date
JPS63500472A (ja) 1988-02-18
US4794802A (en) 1989-01-03
DE3573810D1 (en) 1989-11-23
EP0245236A1 (fr) 1987-11-19
WO1987000562A1 (fr) 1987-01-29
CH668443A5 (de) 1988-12-30

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