EP0440881A2 - Method for the optoelectronic monitoring of thread-shaped materials - Google Patents

Method for the optoelectronic monitoring of thread-shaped materials Download PDF

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Publication number
EP0440881A2
EP0440881A2 EP90118974A EP90118974A EP0440881A2 EP 0440881 A2 EP0440881 A2 EP 0440881A2 EP 90118974 A EP90118974 A EP 90118974A EP 90118974 A EP90118974 A EP 90118974A EP 0440881 A2 EP0440881 A2 EP 0440881A2
Authority
EP
European Patent Office
Prior art keywords
transmitter
receiver
pulse
pulse width
thread
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.)
Ceased
Application number
EP90118974A
Other languages
German (de)
French (fr)
Other versions
EP0440881A3 (en
Inventor
Lutz Prager
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.)
GROSSENHAINER TEXTILMASCHINENBAU GmbH
Original Assignee
GROSSENHAINER TEXTILMASCHINENBAU GmbH
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 GROSSENHAINER TEXTILMASCHINENBAU GmbH filed Critical GROSSENHAINER TEXTILMASCHINENBAU GmbH
Publication of EP0440881A2 publication Critical patent/EP0440881A2/en
Publication of EP0440881A3 publication Critical patent/EP0440881A3/en
Ceased legal-status Critical Current

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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
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a method for optoelectronic monitoring of thread-like materials and is preferably applicable in the textile industry.
  • the invention has for its object to evaluate and compensate for the damping occurring due to environmental influences in a method for optoelectronic monitoring of thread-like materials in the textile industry.
  • Claim 2 further develops this method.
  • the pulse received by the receiver 3 will essentially correspond to the pulse emitted by the transmitter 2, i. H. it will be a narrow pulse, since it is sufficient to signal a space between transmitter 2 and receiver 3 free from interfering influences.
  • This pulse is referred to as the output pulse.
  • a thread-like material is brought into the area of the light beam 1, it is damped and in the receiver 3, a signal is produced which differs significantly in its characteristics from the one emitted, since the pulse distance, the pulse width and the time characteristic of the light beam 1 consisting of individual pulses change as the path between transmitter 2 and receiver 3 is traveled.
  • the method according to the invention now consists in gradually increasing the width of the pulse which the transmitter 2 emits until a pulse with a pulse shape corresponding to the output pulse is received in the receiver 3. Appropriate tests can then be used to assign certain necessary correction values to corresponding states between transmitter 2 and receiver 3. This can be statements about material properties (material thickness, material transparency, etc.) of thread-like material located in the area between transmitter 2 and receiver 3, or also about the presence of thread and / or dirt.
  • filamentary materials have thick and thin places, which in the area of the light beam 1, depending on the delivery speed, modify it so that this leads to a change in the pulse width. Similar but clearly distinguishable changes cause contamination in the area between transmitter 2 and receiver 3.
  • the signals generated in receiver 3 are fed via electronic assemblies, such as amplifiers 4 and threshold switches 5, to a microcomputer 6, in which means in a read-only memory 7 stored program, the received pulses are evaluated and corresponding correction values are formed, which are fed to the transmitter 2 via an output amplifier 8.
  • a signal “maximum attenuation” is triggered via the amplifier 9, which signal can in turn be used to switch on an operator request to clean the area of the thread monitoring.
  • a signal in the form of the output signal triggers the signal "break” and the stopping of the drive via the amplifier 10.
  • the signals SIO IN and SIO OUT, read in or read out via modules 11 and 12, are used to exchange information with the host computer.

Landscapes

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

Abstract

The invention relates to a method for the optoelectronic monitoring of thread-shaped materials and can preferably be used in the textile industry. It is the object of the invention to evaluate and compensate the attenuations of the light beams that occur due to external influences. The solution according to the invention consists in that the width of the light pulse in the transmitter is varied as a function of the pulse width, the temporal pulse width variation and the variation in pulse width distance of the previously emitted light pulse which the latter experienced upon traversing the link from the transmitter to the receiver and which were determined by evaluating the pulses reaching the receiver. The evaluation can be performed with the aid of a microcomputer. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur optoelektronischen Überwachung fadenförmiger Materialien und ist vorzugsweise in der Textilindustrie anwendbar.The invention relates to a method for optoelectronic monitoring of thread-like materials and is preferably applicable in the textile industry.

Es ist bekannt, fadenförmige Materialien mit optoelektronischen Sensoren mittels Gleichlicht oder Wechsellicht gleichbleibender Frequenz zu überwachen (DD-PS 206 659). Nachteilig ist dabei, daß Umwelteinflüsse, wie Fremdlichteinstrahlung oder Verunreinigung der Sensoren, die Wirkung der Vorrichtung negativ beeinflussen. Eine Kompensation dieser Beeinflussungen mittels optischer Filter, Wechsellicht oder besonders ausgestalteter optoelektronischer Überwachungseinheiten ist nur mit einem erhöhten Aufwand zu realisieren.It is known to monitor filamentary materials with optoelectronic sensors by means of constant light or alternating light of constant frequency (DD-PS 206 659). The disadvantage here is that environmental influences, such as external light radiation or contamination of the sensors, adversely affect the action of the device. A compensation of these influences by means of optical filters, alternating light or specially designed optoelectronic monitoring units can only be realized with increased effort.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Verfahren zur optoelektronischen Überwachung fadenförmiger Materialien in der Textilindustrie die durch Umwelteinflüsse auftretenden Dämpfungen auszuwerten und zu kompensieren.The invention has for its object to evaluate and compensate for the damping occurring due to environmental influences in a method for optoelectronic monitoring of thread-like materials in the textile industry.

Diese Aufgabe wird erfindungsgemäß durch die Maßnahmen des Patentanspruchs 1 gelöst. Patentanspruch 2 gestaltet dieses Verfahren weiter aus.This object is achieved by the measures of claim 1. Claim 2 further develops this method.

Weitere Besonderheiten lassen sich der folgenden Beschreibung eines in der Zeichnung in Form eines Prinzipschaltplans dargestellten Ausführungsbeispiels entnehmen, mit dem das erfindungsgemäße Verfahren durchgeführt wird.Further special features can be found in the following description of an embodiment shown in the drawing in the form of a basic circuit diagram with which the method according to the invention is carried out.

Wenn sich im Lichtstrahl 1 zwischen einem optoelektronischen Sender 2 und einem optoelektronischen Empfänger 3 kein fadenförmiges Material und keine Verunreinigungen befinden, wird der vom Empfänger 3 empfangene Impuls im wesentlichen dem vom Sender 2 ausgesendeten Impuls entsprechen, d. h. es wird sich um einen schmalen Impuls handeln, da ein solcher ausreichend ist, um einen von störenden Einflüssen freien Raum zwischen Sender 2 und Empfänger 3 zu signalisieren. Dieser Impuls soll als Ausgangsimpuls bezeichnet werden.If there is no filamentary material and no impurities in the light beam 1 between an optoelectronic transmitter 2 and an optoelectronic receiver 3, the pulse received by the receiver 3 will essentially correspond to the pulse emitted by the transmitter 2, i. H. it will be a narrow pulse, since it is sufficient to signal a space between transmitter 2 and receiver 3 free from interfering influences. This pulse is referred to as the output pulse.

Wird ein fadenförmiges Material in den Bereich des Lichtstrahls 1 gebracht, so wird dieser gedämpft und im Empfänger 3 entsteht ein Signal, das sich deutlich in seiner Charakteristik von dem ausgesendeten unterscheidet, da sich beim Durchlaufen der Strecke zwischen Sender 2 und Empfänger 3 die Impulsdistanz, die Impulsbreite und die Zeitcharakteristik des aus einzelnen Impulsen bestehenden Lichtstrahls 1 verändern. Das erfindungsgemäße Verfahren besteht nun darin, die Breite des Impulses, den der Sender 2 aussendet, schrittweise so lange zu erhöhen, bis im Empfänger 3 ein Impuls mit einer dem Ausgangsimpuls entsprechenden Impulsform empfangen wird. Durch entsprechende Versuche können dann bestimmte notwendige Korrekturwerte entsprechenden Zuständen zwischen Sender 2 und Empfänger 3 zugeordnet werden. Dies können Aussagen über Materialeigenschaften (Materialdicke, Materialtransparenz u. a.) von fadenförmigem Material, das sich im Bereich zwischen Sender 2 und Empfänger 3 befindet, oder auch über das Vorhandensein eines Fadens und/oder von Verschmutzungen sein.If a thread-like material is brought into the area of the light beam 1, it is damped and in the receiver 3, a signal is produced which differs significantly in its characteristics from the one emitted, since the pulse distance, the pulse width and the time characteristic of the light beam 1 consisting of individual pulses change as the path between transmitter 2 and receiver 3 is traveled. The method according to the invention now consists in gradually increasing the width of the pulse which the transmitter 2 emits until a pulse with a pulse shape corresponding to the output pulse is received in the receiver 3. Appropriate tests can then be used to assign certain necessary correction values to corresponding states between transmitter 2 and receiver 3. This can be statements about material properties (material thickness, material transparency, etc.) of thread-like material located in the area between transmitter 2 and receiver 3, or also about the presence of thread and / or dirt.

In der Regel sind fadenförmige Materialien mit Dick- und Dünnstellen behaftet, die im Bereich des Lichtstrahls 1, abhängig von der Liefergeschwindigkeit, diesen so modifizieren, daß dies zu einer Veränderung der Impulsbreite führt. Ähnliche, doch von den genannten deutlich unterscheidbare Veränderungen bewirken Verunreinigungen im Bereich zwischen Sender 2 und Empfänger 3. Die im Empfänger 3 erzeugten Signale werden über elektronische Baugruppen, wie Verstärker 4 und Schwellwertschalter 5, einem Mikrorechner 6 zugeführt, in welchem mittels eines in einem Festwertspeicher 7 gespeicherten Programms die empfangenen Impulse ausgewertet und entsprechende Korrekturwerte gebildet werden, die über einen Ausgangsverstärker 8 dem Sender 2 zugeführt werden.As a rule, filamentary materials have thick and thin places, which in the area of the light beam 1, depending on the delivery speed, modify it so that this leads to a change in the pulse width. Similar but clearly distinguishable changes cause contamination in the area between transmitter 2 and receiver 3. The signals generated in receiver 3 are fed via electronic assemblies, such as amplifiers 4 and threshold switches 5, to a microcomputer 6, in which means in a read-only memory 7 stored program, the received pulses are evaluated and corresponding correction values are formed, which are fed to the transmitter 2 via an output amplifier 8.

Bei Auftreten einer gewissen Verunreinigung im Bereich des Lichtstrahls 1 wird über den Verstärker 9 ein Signal "Maximale Dämpfung" ausgelöst, das wiederum zum Einschalten einer Bedieneraufforderung, den Bereich der Fadenüberwachung zu reinigen, verwendet werden kann. Ein in der Form des Ausgangssignals vorliegendes Signal löst über den Verstärker 10 das Signal "Bruch" und das Stillsetzen des Antriebs aus. Die Signale SIO IN und SIO OUT, eingelesen bzw. ausgelesen über die Baugruppen 11 und 12, dienen dem Austausch von Informationen mit dem Leitrechner.If a certain degree of contamination occurs in the area of the light beam 1, a signal “maximum attenuation” is triggered via the amplifier 9, which signal can in turn be used to switch on an operator request to clean the area of the thread monitoring. A signal in the form of the output signal triggers the signal "break" and the stopping of the drive via the amplifier 10. The signals SIO IN and SIO OUT, read in or read out via modules 11 and 12, are used to exchange information with the host computer.

Claims (2)

Verfahren zur optoelektronischen Überwachung fadenförmiger Materialien in der Textilindustrie, bei welchem von einem Sender Lichtimpulse zu einem Empfänger gesendet und in einer elektronischen Schaltungsanordnung zu Signalen verarbeitet werden,

dadurch gekennzeichnet,

daß die Breite des Lichtimpulses im Sender in Abhängigkeit von der Impulsbreite, der zeitlichen Impulsbreitenänderung und der Impulsbreitendistanzänderung des zuvor ausgesendeten Lichtimpulses, die dieser beim Durchlaufen der Strecke vom Sender zum Empfänger erfahren hat und die durch Auswertung der an den Empfänger gelangenden Impulse ermittelt wurden, verändert wird.Method for optoelectronic monitoring of filamentary materials in the textile industry, in which light pulses are sent from a transmitter to a receiver and processed into signals in an electronic circuit arrangement,

characterized,

that the width of the light pulse in the transmitter as a function of the pulse width, the temporal pulse width change and the pulse width distance change of the previously emitted light pulse, which the latter experienced when traveling the route from the transmitter to the receiver and which were determined by evaluating the pulses arriving at the receiver becomes. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Auswertung mit Hilfe eines Mikrorechners erfolgt.Method according to claim 1,
characterized,
that the evaluation is carried out with the aid of a microcomputer.
EP19900118974 1990-02-08 1990-10-04 Method for the optoelectronic monitoring of thread-shaped materials Ceased EP0440881A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD33767190A DD292076A5 (en) 1990-02-08 1990-02-08 METHOD FOR OPTO ELECTRONIC MONITORING OF THREADED FIBER MATERIALS
DD337671 1990-02-08

Publications (2)

Publication Number Publication Date
EP0440881A2 true EP0440881A2 (en) 1991-08-14
EP0440881A3 EP0440881A3 (en) 1992-07-08

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ID=5616337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900118974 Ceased EP0440881A3 (en) 1990-02-08 1990-10-04 Method for the optoelectronic monitoring of thread-shaped materials

Country Status (3)

Country Link
EP (1) EP0440881A3 (en)
JP (1) JPH03234832A (en)
DD (1) DD292076A5 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0971058A1 (en) * 1998-07-08 2000-01-12 W. SCHLAFHORST AG &amp; CO. Suction system of a textile machine
DE102007059288A1 (en) * 2007-12-08 2009-08-06 Oerlikon Textile Gmbh & Co. Kg Method and device for optical evaluation of the quality of a longitudinally moved fiber strand

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4236413C1 (en) * 1992-10-28 1994-01-27 Inspec Gmbh Test assembly for thickening in yarns or wires - has structured light beam across moving material for evaluation without effect of oscillation, etc.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933297A1 (en) * 1979-08-17 1981-03-26 Hoechst Ag, 65929 Frankfurt Monitoring variations in dia. of moving fibres - carried out optically using control loop regulating light emitting diode emission
DE3635267A1 (en) * 1985-10-16 1987-05-21 Nuovo Pignone Spa OPTICAL DETECTING DEVICE FOR THREAD THICKENING, IN PARTICULAR FOR THE OPEN-END METHOD
DE3938934A1 (en) * 1988-11-24 1990-05-31 Murata Machinery Ltd THREAD MONITORING DEVICE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933297A1 (en) * 1979-08-17 1981-03-26 Hoechst Ag, 65929 Frankfurt Monitoring variations in dia. of moving fibres - carried out optically using control loop regulating light emitting diode emission
DE3635267A1 (en) * 1985-10-16 1987-05-21 Nuovo Pignone Spa OPTICAL DETECTING DEVICE FOR THREAD THICKENING, IN PARTICULAR FOR THE OPEN-END METHOD
DE3938934A1 (en) * 1988-11-24 1990-05-31 Murata Machinery Ltd THREAD MONITORING DEVICE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0971058A1 (en) * 1998-07-08 2000-01-12 W. SCHLAFHORST AG &amp; CO. Suction system of a textile machine
DE102007059288A1 (en) * 2007-12-08 2009-08-06 Oerlikon Textile Gmbh & Co. Kg Method and device for optical evaluation of the quality of a longitudinally moved fiber strand

Also Published As

Publication number Publication date
DD292076A5 (en) 1991-07-18
EP0440881A3 (en) 1992-07-08
JPH03234832A (en) 1991-10-18

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