EP0578976A1 - Dispositif de contrôle de la présence de fils et utilisation de ce dispositif comme casse-chaîne - Google Patents

Dispositif de contrôle de la présence de fils et utilisation de ce dispositif comme casse-chaîne Download PDF

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Publication number
EP0578976A1
EP0578976A1 EP93109439A EP93109439A EP0578976A1 EP 0578976 A1 EP0578976 A1 EP 0578976A1 EP 93109439 A EP93109439 A EP 93109439A EP 93109439 A EP93109439 A EP 93109439A EP 0578976 A1 EP0578976 A1 EP 0578976A1
Authority
EP
European Patent Office
Prior art keywords
thread
sensor
threads
arrangement according
guide
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
EP93109439A
Other languages
German (de)
English (en)
Other versions
EP0578976B1 (fr
Inventor
Walter Dr. Krebs
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.)
Staeubli AG
Original Assignee
Zellweger Uster AG
Staeubli 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, Staeubli AG filed Critical Zellweger Uster AG
Publication of EP0578976A1 publication Critical patent/EP0578976A1/fr
Application granted granted Critical
Publication of EP0578976B1 publication Critical patent/EP0578976B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J1/00—Auxiliary apparatus combined with or associated with looms
    • D03J1/004—Detection and repair of broken warp yarns
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02H—WARPING, BEAMING OR LEASING
    • D02H13/00—Details of machines of the preceding groups
    • D02H13/02—Stop motions
    • D02H13/04—Stop motions responsive to breakage, slackness, or excessive tension of threads, with detectors for individual threads or small groups of threads
    • D02H13/08—Stop motions responsive to breakage, slackness, or excessive tension of threads, with detectors for individual threads or small groups of threads electrical
    • 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
    • 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
    • B65H2701/38—Thread sheet, e.g. sheet of parallel yarns or wires

Definitions

  • the present invention relates to an arrangement for checking the presence of threads of a stretched thread layer on a textile machine, with a measuring sensor for the individual threads that is movable relative to the thread layer.
  • warp monitor slats As is known, these are lined up on the warp threads and fall on a contact rail when a thread is torn, as a result of which an electrical signal is generated. Since the warp thread slats place an additional load on the warp threads, and since the warp threads must also be drawn into the slats, there has long been a desire for a replacement for the known warp guard slats. This wish could in principle be fulfilled with an arrangement of the type mentioned at the beginning.
  • the measuring sensor has a thread guide part which deflects each thread from a rest position and then releases it, whereby the thread guide part is first loaded and then relieved, and a first sensor is provided for detecting this loading and / or relief.
  • a preferred embodiment of the arrangement according to the invention is characterized in that the thread guiding part has a rising guiding flank and that a second sensor is provided following this for detecting the passage of the thread released by the guiding flank.
  • the threads to be monitored are therefore first tensioned by the sensor and then released.
  • the latter occurs suddenly and can therefore be detected relatively easily and reliably
  • the first sensor preferably being formed by a force transducer on the thread guide part and a piezoelectric transducer interacting with it.
  • the second sensor which can be optical or capacitive, enables double measurement and increases the security of the detection of the threads.
  • the two sensors complement one another: the first sensor does not respond to broken threads, which the second sensor may register as normal threads, and the second sensor detects double threads, which the first sensor may evaluate as single threads.
  • the different behavior of the two sensors with regard to broken threads enables
  • a direct and immediate detection of thread breaks is based on a comparison of the signals from the two sensors.
  • the invention further relates to the use of the arrangement mentioned as a warp thread monitor on weaving machines.
  • This use is characterized in that a plurality of measuring sensors are arranged over the warp width and a scanning area of the chain is assigned to each measuring sensor, that each measuring sensor counts the warp threads of its scanning area for each scanning cycle, and that the result of this counting with the known number of warp threads of the respective scanning area is compared.
  • Fig. 1 shows schematically a series of tensioned threads K, which form a thread sheet or thread layer, for example a warp.
  • a measuring sensor M which can be moved transversely to the threads K in the direction of arrow A and which has, inter alia, a thread guide part F and a carrier T for the latter.
  • the thread guide part F is mounted on its carrier T via a pressure-sensitive sensor S1, which is formed by a piezoelectric transducer and is used to detect pressure changes between the thread guide part F and the carrier T.
  • the thread guide part F is, as shown, sawtooth-like and has a wedge-shaped rising guide flank L, by means of which each thread K is increasingly deflected and tensioned from its path. After reaching the maximum tension at the tip of the sawtooth, the thread snaps back into its starting position. The thread guide part F experiences a sudden relief, which is clearly registered by the pressure-sensitive sensor S1.
  • the sawtooth-like thread guide part F has on its steep flank, in the area between its tip and the plane of the threads K in the initial state, an optical sensor S2 formed by a light barrier, which detects from the thread K when it snaps back is crossed in the starting position in any case.
  • the optical sensor S2 delivers a confirmation of the signal of the pressure-sensitive sensor S1.
  • Line 2 shows the typical course of the analog signal of the optical sensor S2 (line a) and of the pressure-sensitive sensor S1 (line b);
  • Line c shows the signal obtained from the direct signal of the pressure-sensitive sensor S1 shown in line b by rectification and filtering.
  • the analog signal is smoothed and amplified and then divided into two signals, one of which is routed to a differential comparator for edge detection and the other to an adjustable DC comparator for level detection . Subsequently, pulses that are too short are suppressed with an integrator.
  • the number of pulses is counted in each scanning cycle and compared with the known number of threads scanned in this cycle. If there is a difference, it is assumed that there is a thread break and the corresponding textile machine is switched off.
  • the combination of the two sensors S1 and S2 has, in addition to the redundancy caused by the multiple measurement of each thread, the particular advantage that torn and thus loose threads are recognized better and more reliably.
  • a loose thread on the one hand causes a wider signal from the optical sensor S2 (line a), but on the other hand the corresponding one is missing Signal from the pressure sensitive sensor S1.
  • a broken thread can be recognized during the scanning and not only at the end of a scanning cycle, as is the case with a pure counting method.
  • the combination of the two sensors S1 and S2 is also advantageous when double threads are present.
  • double threads should in principle already be recognized by the pressure-sensitive sensor S1 (compare EP-B-0 206 196), the special conditions on weaving machines can mean that this is not the case.
  • the optical sensor S2 generates an extraordinarily wide pulse which, together with the signal from the pressure-sensitive sensor S1 indicating a single thread, provides the indication of a double thread, which is then taken into account accordingly when checking the result of the counting.
  • FIG. 3 shows the arrangement of the measuring sensor M shown in FIG. 1 on a weaving machine which has a warp beam 1, a match beam 2, heddles 3, a reed 4 and a fabric beam 5.
  • the illustration is not true to scale, since the measuring sensor M and the parts assigned to it are drawn too large in relation to the parts of the weaving machine.
  • the sensor M is arranged in a housing 6, which contains, among other things, a drive 7 for the sensor M and thread supports 8 arranged on both sides of the latter.
  • sensors M are arranged in the common housing 6 at intervals of about 10 to 20 cm across the width of the chain.
  • the sensors M are driven by the drive 7 in an oscillating manner and scan their scanning range about 6 times per second.
  • the scanning areas can be divided into sectors each containing no more than about 100 threads by suitable means such as combs or dividers.
  • the sensor M would then count the number of threads in the sectors and compare them with a predetermined value, it being possible to assume that with these small thread numbers, random measurement errors would in any case not occur in several successive measurements.
  • FIGS. 5 and 7 show two exemplary embodiments of the measuring sensor M, which differ essentially only in the shape of their support T (FIG. 1) designed as a housing and in the position of the optical sensor S2 (FIG. 1).
  • 4 and 6 show a perspective view of the respective sensor M and
  • FIGS. 5 and 7 show a longitudinal section through it.
  • Both versions each have a housing 10, which has a groove-shaped or slot-shaped depression 11 on its edge facing the threads K for receiving the pressure-sensitive sensor S1.
  • this consists of a bimorph piezo rod 12 which is fastened on a holding web 13 forming part of the recess 11, and of a thin force transducer 14 or 14 'which is glued to the piezo rod 12 and is in the form of an elongated plate or a sufficiently rigid metal foil or a stick.
  • the sensor S1 consisting of piezo rods 12 and force transducers 14 or 14 '
  • stiff sensors result in better thread separation
  • the sensors usually have several natural resonance frequencies that should not be too close together to avoid disturbing beats, and that the natural frequency and the damping that determines the decay time should be high to enable a high count rate.
  • the web-like side walls of the housing 10 which delimit the recess 11 and which lie on both sides of the force transducer 14, 14 'form a straight or curved sliding surface 15 or 15' on their upper edge facing the threads K for the threads which lead to their orderly feeding serves on the force transducer 14 or 14 '.
  • the sliding surfaces and the force transducers are mutually arranged such that the sliding surfaces 15, 15 'at the thread inlet end of the force transducer 14, 14', that is the left end in FIGS. 5 and 7, project above the level of the force transducer 14, 14 '. and that the force transducer 14, 14 'pierces the level of the sliding surfaces 15, 15' at its scanning end.
  • the force transducer is either arranged parallel to the plane of the threads K and bent upwards at its scanning end (force transducer 14, FIGS. 4, 5), or that it is arranged inclined to the plane of the threads K (force transducer 14 ', 6, 7). It is essential in both cases that the scanning end of the force transducer 14, 14 'projecting beyond the piezo rod 12 pierces the level of the sliding surfaces 15 and 15' and protrudes into the plane of the threads K in order to be able to be contacted by them.
  • the optical sensor S2 contains one or more light guides 16, 16 '.
  • the light guide 16 is arranged analogously to FIG. 1 and opens into the steeply sloping, rear end face of the housing 10, namely at the level between the force transducer 14 and the normal position of the threads K. In this arrangement, crosses each falling from the force transducer 14 and returning to its normal position, the beam of light emitted by the light guide 16 and triggers a corresponding signal.
  • a pair of light guides 16' arranged on both sides of the force transducer 14 ' is provided. These are guided vertically in the housing 10 and their ends open immediately after the end of the force transducer 14 'in the sliding surfaces 15'. Since in this embodiment the sliding surfaces 15 'also continue after the force transducer 14', the threads K do not suddenly return to their normal position after falling off the force transducer 14 ', but are returned to the sliding surfaces 15'. The threads K cross the light guides 16 ', as a result of which a corresponding signal is generated.
  • the length of the piezo rod 12 and the free length of the force transducer 14, 14 ' that is the length by which the force transducer projects beyond the piezo rod, are of the order of millimeters and the thickness of the force transducer 14, 14' is of the order of 10 von 2 to 10 ⁇ 1 millimeters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
EP93109439A 1992-06-17 1993-06-14 Dispositif de contrÔle de la présence de fils et utilisation de ce dispositif comme casse-chaîne Expired - Lifetime EP0578976B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1909/92 1992-06-17
CH1909/92A CH685635A5 (de) 1992-06-17 1992-06-17 Anordnung zur Kontrolle des Vorhandenseins von Fäden einer aufgespannten Fadenschicht an einer Textilmaschine.

Publications (2)

Publication Number Publication Date
EP0578976A1 true EP0578976A1 (fr) 1994-01-19
EP0578976B1 EP0578976B1 (fr) 1996-08-14

Family

ID=4221439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93109439A Expired - Lifetime EP0578976B1 (fr) 1992-06-17 1993-06-14 Dispositif de contrÔle de la présence de fils et utilisation de ce dispositif comme casse-chaîne

Country Status (8)

Country Link
US (1) US5424723A (fr)
EP (1) EP0578976B1 (fr)
JP (1) JPH0665841A (fr)
KR (1) KR940000646A (fr)
CH (1) CH685635A5 (fr)
DE (1) DE59303419D1 (fr)
ES (1) ES2090782T3 (fr)
TW (1) TW226418B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640485A2 (fr) * 2004-09-28 2006-03-29 PROTECHNA Herbst GmbH & Co. KG Dispositif pour déterminer la tension du fil d'un fil individuel d'une nappe de fils dans le traitement de textile
CN102899789A (zh) * 2012-11-08 2013-01-30 江苏联发纺织股份有限公司 织机的在线双面上蜡装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19756242A1 (de) * 1997-12-17 1999-06-24 Iro Ab Fadenliefergerät
US8016752B2 (en) * 2003-01-17 2011-09-13 Gore Enterprise Holdings, Inc. Puncturable catheter
KR101043946B1 (ko) 2011-03-14 2011-06-24 주식회사 마이크로텍 감도가 크게 향상된 텐터 필러 및 그 감지 방법
CZ303018B6 (cs) * 2011-08-10 2012-02-29 Technická univerzita v Liberci Zpusob a zarízení k merení tkacího odporu na tkacím stroji
CN102851853A (zh) * 2012-09-28 2013-01-02 吴江市隆泰喷织厂 喷水织机的断线捕捉装置
CN104088064A (zh) * 2014-07-31 2014-10-08 安徽华茂纺织股份有限公司 一种喷气织机的张力停经钩装置
CN107780035A (zh) * 2016-08-31 2018-03-09 佛山市叱咤科技有限公司 断经自停装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023583A1 (fr) * 1979-08-03 1981-02-11 Akzo GmbH Procédé et dispositif pour constater les différences de tension de fil
FR2528882A1 (fr) * 1982-06-21 1983-12-23 V U Koncernova Ucelova Org Zvs Dispositif reflecteur optique et electronique pour l'exploration de fils de trame ou de fils de chaine
EP0196220A1 (fr) * 1985-03-25 1986-10-01 Kanai School Incorporation Méthode pour détecter un fil cassé d'une nappe de fil et détecteur pour l'exécution de cette méthode
DE3832984A1 (de) * 1988-09-29 1990-04-12 Akzo Gmbh Fadenbruchanzeige in fadenscharen
DE4036861A1 (de) * 1989-11-20 1991-06-20 Toyoda Automatic Loom Works Verfahren und vorrichtung zur ermittlung einer abnormalitaet im kettfadeneinzug

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH597081A5 (fr) * 1976-10-13 1978-03-31 Loepfe Ag Geb
CH613674A5 (fr) * 1977-02-10 1979-10-15 Zellweger Uster Ag
FR2508882B1 (fr) * 1981-07-06 1985-08-16 Inst Textile De France Systeme de detection de la presence de fils sur un continu a filer
CH668277A5 (de) * 1985-06-26 1988-12-15 Zellweger Uster Ag Ueberwachungsvorrichtung fuer doppelfaeden an webkettenknuepfmaschinen.
DE3702049A1 (de) * 1987-01-24 1988-08-04 Sipra Patent Beteiligung Vorrichtung zur ueberwachung des garnvorrates auf garnspulen
DE3822984A1 (de) * 1988-07-07 1990-01-18 Jansen Hans Juergen Dipl Ing Verfahren zur uebertragung von lerninhalten im alpha-zustand des lernenden und anordnung zur durchfuehrung des verfahrens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023583A1 (fr) * 1979-08-03 1981-02-11 Akzo GmbH Procédé et dispositif pour constater les différences de tension de fil
FR2528882A1 (fr) * 1982-06-21 1983-12-23 V U Koncernova Ucelova Org Zvs Dispositif reflecteur optique et electronique pour l'exploration de fils de trame ou de fils de chaine
EP0196220A1 (fr) * 1985-03-25 1986-10-01 Kanai School Incorporation Méthode pour détecter un fil cassé d'une nappe de fil et détecteur pour l'exécution de cette méthode
DE3832984A1 (de) * 1988-09-29 1990-04-12 Akzo Gmbh Fadenbruchanzeige in fadenscharen
DE4036861A1 (de) * 1989-11-20 1991-06-20 Toyoda Automatic Loom Works Verfahren und vorrichtung zur ermittlung einer abnormalitaet im kettfadeneinzug

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640485A2 (fr) * 2004-09-28 2006-03-29 PROTECHNA Herbst GmbH & Co. KG Dispositif pour déterminer la tension du fil d'un fil individuel d'une nappe de fils dans le traitement de textile
EP1640485A3 (fr) * 2004-09-28 2008-05-14 PROTECHNA Herbst GmbH & Co. KG Dispositif pour déterminer la tension du fil d'un fil individuel d'une nappe de fils dans le traitement de textile
CN102899789A (zh) * 2012-11-08 2013-01-30 江苏联发纺织股份有限公司 织机的在线双面上蜡装置

Also Published As

Publication number Publication date
DE59303419D1 (de) 1996-09-19
KR940000646A (ko) 1994-01-03
TW226418B (fr) 1994-07-11
ES2090782T3 (es) 1996-10-16
EP0578976B1 (fr) 1996-08-14
JPH0665841A (ja) 1994-03-08
US5424723A (en) 1995-06-13
CH685635A5 (de) 1995-08-31

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