EP1042208B1 - Verfahren und vorrichtung zum detektieren von fadenfehlern während der herstellung, insbesondere bei chenille fäden - Google Patents

Verfahren und vorrichtung zum detektieren von fadenfehlern während der herstellung, insbesondere bei chenille fäden Download PDF

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Publication number
EP1042208B1
EP1042208B1 EP98966419A EP98966419A EP1042208B1 EP 1042208 B1 EP1042208 B1 EP 1042208B1 EP 98966419 A EP98966419 A EP 98966419A EP 98966419 A EP98966419 A EP 98966419A EP 1042208 B1 EP1042208 B1 EP 1042208B1
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EP
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Prior art keywords
yarn
optical sensor
shadow
defects
array
Prior art date
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Expired - Lifetime
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EP98966419A
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English (en)
French (fr)
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EP1042208A1 (de
Inventor
Massimo Brunamonti
Adriano Conti
Gastone Mario Dell'aglio
Paolo Montanelli
Simone Picciotti
Romeo Romei
Stefano Tosi
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Iteco Srl
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Iteco Srl
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
    • B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
    • B65H63/0324—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators using photo-electric sensing means, i.e. the defect signal is a variation of light energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • B65H63/062—Electronic slub detector
    • B65H63/065—Electronic slub detector using photo-electric sensing means, i.e. the defect signal is a variation of light energy
    • 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

  • the present invention generally relates the field of textiles and more precisely it relates to a method for detecting yarn defects during production.
  • the invention but not exclusively, relates to the detection of yarns defects of chenille yarns, fancy yarns and the like.
  • the invention relates to an apparatus that carries out such method.
  • Chenille yarns defects, as well as defects of other yarns having high count, may be classified as long defects or short defects.
  • count of yarn is normally indicated the meters of yarn necessary for making 1 kg of yarn.
  • the former corresponds to a concentrated decrease of the count of yarn, that in the case of chenille is due to lack of transversal yarn, whereas chenille "burl" defects are due to local thickening of transversal yarns or to transversal yarns of increased length.
  • a yarn of good quality must be without both long defects and short defects. In particular, if during production defects are detected, the yarn must be cut, the machine must be stopped and the continuity of the yarn must be restored, after having eliminated the defective portion.
  • a first problem that arises from these devices is the need of optical sensors, such as high-definition photodiodes having large active area and then very expensive.
  • a second problem is that, in the case of chenille yarn, its helical shape does not allow the use of these devices which, since they project a shadow, detect wrongly a defect when the plane containing a portion of yarn of chenille is parallel to the light source.
  • An apparatus for detecting defects of a yarn comprising a transparent curved surface on which the yarn slides thus reducing its helix effect.
  • Optical sensor means are located outside the curved surface whereas within the curvature of the transparent surface a light source is arranged. This device is not suitable for detecting defects in chenille yarns.
  • a slit is present transversal to the direction of the yarn, capable of increasing the precision of defect recognition.
  • said slit is located between the transparent surface and the lens means and has a thickness comprised between 0,2 mm and 2 mm.
  • the computing unit comprises hardware means for analysing the shadow and for operating the stop of the yarn.
  • the computing unit comprises software means for analysing the shadow and for operating the stop of the yarn.
  • the transparent surface is associated to lens means capable of concentrating the image projected by the light source onto the sensor means.
  • the software means residing in said computing unit comprises means for storing the profile of the yarn as projected onto the sensor means versus time and means for subtracting the stored profile from the real image of the yarn as projected onto the sensor means, whereby the defects are distinguished from the comparison of the stored profile with respect to the real image.
  • the method for detecting defects has the characteristic that it comprises the steps of:
  • the step of detecting comprises a step of passage of the shadow through a slit transversal to the direction of the yarn, for increasing the precision of defect recognition.
  • the step of detecting comprises a step of focusing the shadow on the optical sensor.
  • the step of analysing the shadow of the yarn comprises the step of storing the profile versus time of the yarn as projected onto the sensor means and subtracting the stored profile from the real image of the yarn as projected onto the sensor means, whereby the defects are distinguished after the comparison of the stored profile with respect to the real image.
  • an apparatus for detecting defects on a yarn 2 during production comprises a detecting device 1 and, respectively upstream and downstream of it, braking deflector means 3 of yarn 2 and cutting means 4a and 4b of yarn 2.
  • apparatus 1 comprises a drum 5, located between two shoulders 6, on which yarn 2 passes.
  • yarn 2 passes substantially stretched and partially wound on drum 5 so that it is pressed against its surface.
  • Light emitting means 7 are provided outside drum 5, which, always according to the invention, is transparent and comprises inside an optical sensor 8. This way the light beam coming from the emitting means 7 projects yarn 2 on optical sensor 8, that detects continuously the amplitude of its shadow.
  • optical sensor 8 detects an increase or decrease of transversal size of yarn 2, beyond a certain a predetermined threshold value, the yarn is stopped and cut and then joined again after having eliminated the defective portion.
  • the apparatus 1 according to the present invention is particularly suitable for detecting defects on chenille yarns, as shown in figures 2A, 2B.
  • a yarn of chenille which as shown is formed by a longitudinal yarn 9 from which portions 10 of yarn project transversally, extends substantially as an helix and then its image projected is not constant although the yarn is without defects.
  • the stretching action of the chenille yarn 2 on drum 5 causes, as shown in figure 2B, a pressing effect on a cylindrical surface of the transversal portions 10 of yarn, that would otherwise normally arrange according to an helix. This way a substantially homogeneous strip-like shadow is created.
  • optical sensor 8 comprises a support 15 for a lens 16 located between a slit 17 and an optical sensor 18.
  • Sensor 18, for the presence of lens 16 does not need a very large area, even if its precision is the same as a sensor having a much larger detecting area.
  • slit 17 is transversal to yarn 2 and has a width set between 0,2 and 2 mm. This way, the projection of the shadow of the yarn on the optical sensor is substantially filtered by slit 17, thus making easier the recognition of defects by the optical sensor. With width comprised between 0,4 and 0,6 mm the maximum values of precision of recognition has been met.
  • a bush 19 has been added comprising a slit 19a between the transparent drum 5 and the lens 16 transversally to the yarn, in particular orthogonal to it.
  • slit 19a has a width comprised between 0,2 and 2 mm. In particular with width comprised between 0,4 and 0,6 mm the maximum values of precision of recognition have been met.
  • Optical sensor 18 is connected to a computing unit, not shown, comprising an detecting apparatus like that of figure 5. It has a low-pass filter 20 with adjustable frequency of cut. Filter 20, in case the speed of the chenille being detected is enough, has an input signal like that shown in figure 6 and gives the output signal of figure 7. After differentiation versus time of the signal of figure 7 by means of an operational amplifier 21, an output signal like that of figure 8 results, that can be checked by an adjustable window comparator 22, for recognising the defect of fault or of burl. This is possible, in particular, since operational amplifier 21, beyond signalling the defect, clears the mean value, thus creating an absolute reference starting from which the threshold of the comparator is set, said reference being a voltage equal to zero.
  • FIG 9 a flux diagram is shown of such microprocessor comprising the successive steps for analysing each input signal of the array of digital signals coming from the photodiode. These signals, which are the output of the analogue to digital converter, are indicated as AD.
  • the software means according to the flux diagram of figure 9 carry out the reduction of the helix effect of the chenille during the sliding thereof on the optical system.
  • ARRAY() is a vector having N positions which has the function of storing the values AD acquired from the analogue to digital converter A/D.
  • SUM is a variable that sums the values of ARRAY() and "i" is the index of the actual location of ARRAY().
  • Vm of SUM is calculated and the index "i" is incremented, checking that it is not greater than the maximum dimension N of ARRAY(i).
  • Vo is calculated subtracting Vm from AD.
  • Vo is the value to compare with the threshold values indicated as THRESHOLD L, for the defect of "fault” and as THRESHOLD N, for the defect of "burl". If Vo is external to values THRESHOLD L and THRESHOLD N, the microprocessor operates the cut of the yarn, otherwise it continues to repeat the above indicated calculus.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Textile Engineering (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (11)

  1. Vorrichtung zur Detektion von Defekten eines Garnes (2, 9), mit:
    einer transparenten gekrümmten Oberfläche (5);
    ein Zugmittel, das dazu fähig ist, eine Verschiebung des Garnes (2, 9) gegen die transparente gekrümmte Oberfläche (5) zu verursachen, um den Helixeffekt des Garnes (2, 9) zu reduzieren;
    einer optischen Sensorvorrichtung (8) und einer Lichtquelle (7), die der transparenten gekrümmten Oberfläche (5) zugeordnet sind;
    einer mit der optischen Sensorvorrichtung (8) verbundenen Recheneinheit, die dazu fähig ist, den durch die Lichtquelle (7) durch die gekrümmte transparente Oberfläche (5) auf die optische Sensorvorrichtung (8) geworfenen Schatten des Garnes (2,9)zu analysieren und zu steuern, sowie ein Anhalten des Zugmittels und ein Schneiden des Garnes (2, 9) zu veranlassen, wenn besagte Defekte erkannt werden;
       dadurch gekennzeichnet, dass
    die optische Sensorvorrichtung (8) und die Lichtquelle (7) an entgegengesetzten Seiten der transparenten gekrümmten Oberfläche (5) angeordnet sind; und
    ein zu der Richtung des Garnes (2, 9) transversaler Schlitz (17) zwischen der transparenten gekrümmten Oberfläche (5) und der optischen Sensorvorrichtung (8) angeordnet ist, wodurch der Schlitz (17) fähig ist, die Präzision der Defektdetektion zu erhöhen.
  2. Vorrichtung nach Anspruch 1, wobei die transparente gekrümmte Oberfläche (5) einer Linsenvorrichtung (16) zugeordnet ist, die dazu fähig ist, das von der Lichtquelle (7) auf die Sensorvorrichtung (8) geworfene Bild zu konzentrieren.
  3. Vorrichtung nach Anspruch 2, wobei der Schlitz (17) eine Breite zwischen 0,2 mm und 2 mm aufweist.
  4. Vorrichtung nach Anspruch 1, wobei die Recheneinheit eine Hardwarevorrichtung aufweist zu Analyse des Schattens und zum Veranlassen des Anhaltens des Garnes (2, 9).
  5. Vorrichtung nach Anspruch 4, wobei die Hardwarevorrichtung:
    einen Tiefpassfilter mit verstellbarer Schneidegeschwindigkeit;
    einen Operationsverstärker zur Differenzierung des Ausgangssignales des Filters über die Zeit;
    einem zweiten Operationsverstärker zur Subtraktion des differenzierten Signals von dem Mittelwert des Ausgangssignales des Filters und zur Detektion eines Fehlers oder eines Knotendefektes nach dessen Vergleich mit einem Schwellwert, aufweist.
  6. Vorrichtung nach Anspruch 1, wobei die Recheneinheit darin enthaltene Softwaremittel aufweist, zur Analyse des Schattens des Garnes (2, 9) und zum Veranlassen des Anhaltens des Garnes (2, 9).
  7. Vorrichtung nach Anspruch 6, wobei die Softwaremittel Mittel zur Speicherung des auf die Sensorvorrichtung (8) geworfenen Garnprofiles über die Zeit aufweist, und Mittel zur Subtraktion des gespeicherten Profils von dem auf die Sensorvorrichtung (8) geworfenen realen Abbildes des Garnes (2, 9), wobei die Defekte durch einen Vergleich des gespeicherten Profils mit dem realen Abbild erhalten werden.
  8. Vorrichtung nach Anspruch 6 oder 7, wobei die Softwaremittel einen Rechenfluss zur Reduzierung des Helixeffektes des Garnes (2, 9) gemäß folgender Schritte aufweisen:
    Definition von Variablen ARRAY(), SUM, und "i", wobei ARRAY() ein Vektor mit N Positionen ist und die Funktion einer Speicherung von von einem Analog Digital Wandler A/D erhaltenen AD-Werten hat, SUM eine Variable ist, die die Summe der Werte von ARRAY() speichert, und "i" der Index der tatsächlichen Position von ARRAY() ist;
    anfängliches Löschen der Variablen ARRAY(), SUM und "i";
    Zuordnung jedes Wertes von AD zu ARRAY(i), und Addition derselben zum vorherigen Wert von SUM und von ARRAY(i);
    Berechnung eine Wertes V0 durch Subtraktion von Vm von AD;
    Vergleich von V0 mit durch THRESHOLD L angezeigten Schwellwerten für den Defekt "fault", und mit durch THRESHOLD N angezeigten Schwellwerten für den Defekt "burl";
    Wiederholung der Berechnung oder Veranlassung eines Abschneidens des Garnes (2, 9), wenn V0 außerhalb von Werten THRESHOLD L und THRESHOLD N liegt.
  9. Verfahren zur Detektion von Defekten eines Garnes, dadurch gekennzeichnet, dass es folgende Schritte aufweist:
    Ziehen des Garnes (2, 9) zwischen einer Lichtquelle (7) und einem optischen Sensor;
    Dehnen und Pressen des Garnes (2, 9) auf einer gekrümmten transparenten Oberfläche (5) zwischen der Lichtquelle (7) und dem optischen Sensor, wobei das Garn mit hoher Geschwindigkeit auf der transparenten gekrümmten Oberfläche (5) gleitet;
    Delektieren des durch die Lichtquelle (7) durch die transparente gekrümmte Oberfläche (5) auf den optischen Sensor geworfenen Schattens;
    Überprüfen des geworfenen Schattens und Anhalten des Ziehens bei Detektion eines Defektes
       dadurch gekennzeichnet, dass
    der Schritt des Detektierens einen Schritt des Passierens des Schattens durch einen zur Richtung des Garnes (2, 9) transversalen Schlitz (17) enthalt, zur Erhöhung der Präzision der Defekterkennung.
  10. Verfahren zur Detektion von Defekten nach Anspruch 9, wobei der Schritt des Detektierens einen Schritt des Fokussierens des Schattens auf den optischen Sensor enthält.
  11. Verfahren zur Detektion von Defekten nach Anspruch 10, wobei der Schritt des Analysierens des geworfenen Schattens den Schritt eines Speichern des auf den Sensor (8) geworfenen Profils des Garnes (2, 9) über die Zeit, und eines Subtrahierens des gespeicherten Profils von dem realen auf den Sensor (8) geworfenen Abbildes des Garnes (2, 9) enthält, wodurch die Defekte durch den Vergleich des gespeicherten Profils mit dem realen Abbild erhalten werden.
EP98966419A 1998-01-02 1998-12-30 Verfahren und vorrichtung zum detektieren von fadenfehlern während der herstellung, insbesondere bei chenille fäden Expired - Lifetime EP1042208B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT1998PI000001A IT1304528B1 (it) 1998-01-02 1998-01-02 Metodo e dispositivo per la rilevazione di difetti di filati in fasedi produzione in particolare filati di ciniglia.
ITPI980001 1998-01-02
PCT/EP1998/008510 WO1999035075A1 (en) 1998-01-02 1998-12-30 Method and apparatus for detecting yarn defects during production, in particular chenille yarns

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Publication Number Publication Date
EP1042208A1 EP1042208A1 (de) 2000-10-11
EP1042208B1 true EP1042208B1 (de) 2002-09-18

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EP98966419A Expired - Lifetime EP1042208B1 (de) 1998-01-02 1998-12-30 Verfahren und vorrichtung zum detektieren von fadenfehlern während der herstellung, insbesondere bei chenille fäden

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EP (1) EP1042208B1 (de)
AU (1) AU2276999A (de)
DE (1) DE69808137T2 (de)
HU (1) HUP0100040A2 (de)
IT (1) IT1304528B1 (de)
PL (1) PL188682B1 (de)
TR (1) TR200002006T2 (de)
WO (1) WO1999035075A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1359108A1 (de) * 2002-04-30 2003-11-05 Seltec srl Verfahren und kompakte Vorrichtung zum Detektieren von Fadenfehlern während der Herstellung, insbesondere bei chenille Fäden
ITFI20030069U1 (it) * 2003-07-25 2005-01-26 Giesse Srl Macchina per produrre filati di ciniglia
DE10348689A1 (de) * 2003-10-16 2005-05-19 Saurer Gmbh & Co. Kg Verfahren zum Herstellen eines Effektgarnes
DE10352429A1 (de) * 2003-11-10 2005-06-23 Saurer Gmbh & Co. Kg Garnreiniger
DE102004003032A1 (de) * 2004-01-21 2005-08-11 Saurer Gmbh & Co. Kg Verfahren zum Herstellen eines Effektgarnes
ITMI20040252A1 (it) * 2004-02-16 2004-05-16 Tiziano Barea Dispositivo per l'analisi ottica anche bidimensionale di un filo o filato
CA2472865C (en) * 2004-06-29 2015-11-17 Instrumar Limited Fibre monitoring apparatus and method
US7983785B2 (en) 2004-06-30 2011-07-19 Instrumar Limited Fibre monitoring apparatus and method
WO2020214107A1 (en) * 2019-04-17 2020-10-22 Alya Teksti̇l Sanayi̇ Ti̇caret Li̇mi̇ted Şi̇rketi̇ Device for clearing yarn faults

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
US4341958A (en) * 1979-08-21 1982-07-27 Ohsawa Shiujia Yarn-break/yarn-stop detecting device
JPS6337082A (ja) * 1986-07-30 1988-02-17 Gunze Ltd 糸条の走行監視装置
DE4122305B4 (de) * 1991-07-05 2006-01-12 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Vorrichtung zur optoelektronischen Abtastung eines Fadens
CH686779A5 (de) * 1993-10-29 1996-06-28 Luwa Ag Zellweger Vorrichtung zur Ueberpruefung der Wickelqualitaet von Garnspulen und Verwendung der Vorrichtung an einer Spul- oder Spinnmaschine.

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WO1999035075A1 (en) 1999-07-15
DE69808137D1 (de) 2002-10-24
AU2276999A (en) 1999-07-26
PL188682B1 (pl) 2005-03-31
HUP0100040A2 (hu) 2001-06-28
ITPI980001A0 (it) 1998-01-02
IT1304528B1 (it) 2001-03-19
EP1042208A1 (de) 2000-10-11
TR200002006T2 (tr) 2001-07-23
DE69808137T2 (de) 2003-05-28
ITPI980001A1 (it) 1999-07-02
PL341517A1 (en) 2001-04-23

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