EP1893996A1 - Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement - Google Patents

Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement

Info

Publication number
EP1893996A1
EP1893996A1 EP06741631A EP06741631A EP1893996A1 EP 1893996 A1 EP1893996 A1 EP 1893996A1 EP 06741631 A EP06741631 A EP 06741631A EP 06741631 A EP06741631 A EP 06741631A EP 1893996 A1 EP1893996 A1 EP 1893996A1
Authority
EP
European Patent Office
Prior art keywords
signal
test material
sensor
electrostatic
electrical
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Withdrawn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
EP06741631A
Other languages
German (de)
English (en)
Inventor
Philipp Ott
Peter Schmid
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.)
Uster Technologies AG
Original Assignee
Uster Technologies 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 Uster Technologies AG filed Critical Uster Technologies AG
Priority to EP09009532A priority Critical patent/EP2108949A1/fr
Publication of EP1893996A1 publication Critical patent/EP1893996A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/003—Detection and removal of impurities
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/228—Circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/365—Filiform textiles, e.g. yarns
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/60—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrostatic variables, e.g. electrographic flaw testing

Definitions

  • the present invention is in the field of testing with electrical means of solid, elongated, preferably textile structures such as card sliver, roving, yarn or fabric.
  • It relates to a method and a device for detecting foreign substances in a moving, solid, elongated
  • Test material according to the preambles of the independent claims.
  • a preferred application is the
  • a reference capacitor is used. This can be formed by adding a third, parallel to the two measuring capacitor plates arranged capacitor plate, wherein the three capacitor plates are connected together to form a capacitive bridge.
  • this measure does not eliminate interference caused by moisture changes of the test material itself. Therefore, too many wrong responses occur with this measurement principle.
  • EP-O '301'395 A2 discloses a method and apparatus for detecting asperities on a moving, electrically insulating web.
  • An electrically conductive, transverse to the direction of movement wire is disposed in the vicinity of the web. Electrical charges present on the track surface generate an electrical signal in the wire.
  • Thread monitoring device to create the two
  • EP-I '037' 047 Al takes up the triboelectric measuring principle. It describes a method and a device for detecting foreign materials in a moving textile material. At first, any existing charges are removed from the textile material by stripping electrodes. A sensor is provided for receiving triboelectric signals from the moving textile material. The output of the probe is compared with a reference value indicative of the textile material without extraneous materials. Based on the result of the comparison, it is determined whether foreign material is present. The removal of the already existing charges by stripping and the application of charges on the textile material causes additional effort and additional space. In addition, this measurement principle also provides too many false responses, mainly caused by electrostatic discharges. The incorrect responses occurring in the prior art are highly undesirable because they lead to unnecessary shutdowns of the production process. This results in production outages for the user. This can be particularly dramatic on spinning machines, where a shutdown takes about 10 minutes. The economic damage of many unnecessary shutdowns is enormous.
  • the method and the device should be simple or space-saving.
  • a better selectivity should be achieved.
  • the shortcomings of the prior art should be significantly reduced, with the same high or higher reliability and sensitivity in the detection of foreign matter.
  • the invention simplifies the methods and devices known, in particular from EP-I '037' 047 A1, by dispensing with the discharge of already existing charges from the test material and the renewed controlled application of charges to the test material. Instead, it presupposes the presence of charges on the test material and uses these charges to obtain information about the test material or any foreign matter components from them.
  • This departure from the measuring principle known hitherto represents a radical change in the detection of foreign substances. It leads to a simplification in the method and a saving of space in the device.
  • both an electrostatic signal - by charge measurement - as well as another, z. B. capacitive or optical, received signal from the sample, and both signals are used to detect foreign substances.
  • the electrostatic signal then provides a coarse measurement, the further signal, if necessary, a fine measurement. Since the electrostatic signal is hardly affected by moisture, incorrect responses caused by humidity fluctuations are eliminated.
  • the further signal refines the measurement and, if necessary, allows the consideration of influences and parameters that the electrostatic signal does not allow. can capture. So z. B. due to the additional signal in addition to impurity levels and the thickness of the test material can be determined. It is particularly advantageous and space-saving if the electrostatic signal and the further signal from one and the same sensor, for. B. a measuring capacitor can be recorded.
  • the invention includes the use of a sensor to receive an electrostatic signal to detect extraneous matter in a moving, solid, elongated sample.
  • the sensor is capable of picking up an electrostatic signal from those surplus charges that were previously present on the test material. These excess charges can z. B. be applied by friction on machine parts such as balloon limiters, thread tensioner or guide eyelets on the test material.
  • an electrostatic signal is taken from the test material and used for the detection of foreign substances.
  • the electrostatic signal is thereby absorbed by such surplus charges that were previously present on the test material.
  • an additional signal is additionally received by the test material, and both the electrostatic signal and the further signal are used for the detection of foreign substances.
  • the test material is exposed to a high-frequency alternating electric field. Properties of the alternating electric field interacting with the test material are determined by picking up a high-frequency electrical signal and demodulating it with a carrier frequency of the alternating electric field. A second, quasi-static electrical signal originating from the test material is recorded. Both the first and second electrical signals are used for the detection of foreign matter.
  • the inventive apparatus for detecting foreign substances in a moving, solid, elongate material to be tested includes a sensor for receiving an electrostatic signal from the test material and evaluation means for evaluating the electrostatic signal and for detecting foreign substances.
  • the sensor is suitable for receiving an electrostatic signal from such excess charges that were previously present on the test material.
  • the inventive device further includes a sensor for receiving a further signal from the test material and evaluation means for evaluating the electrostatic signal and the further signal and for detecting foreign substances.
  • an electrostatic signal is understood as meaning a signal which originates from charges resting on the test specimen, which charges can be tapped off by galvanic contact or detected without contact, for example by influence but their accelerations and velocities are relatively small, so that one can still speak of an electrostatic signal
  • Both cases could alternatively be described by the term “passive charge shift" - in contrast to the active generation of a high-frequency alternating electric field, as described in EP -O '924' 513 Al is taught.
  • Figure 1 is an electrical circuit diagram of an embodiment of the inventive device
  • FIG. 2 shows a flowchart of an embodiment of the method according to the invention.
  • the device 1 includes a measuring capacitor 2. This is a flat in this embodiment
  • Two-plate capacitor having a first, substantially planar capacitor plate 21 and a second, substantially flat capacitor plate 22.
  • the capacitor plates 21, 22 are each about 0.8 mm thick, consist for. B. made of brass and may, for achieving a higher abrasion resistance z. B. be coated with nickel.
  • the two capacitor plates 21, 22 are separated by an approximately 1-3 mm, preferably about 1.5-2.0 mm thick air gap, which forms a passage opening 26 for a solid, elongated fürgut 9.
  • the scholargut 9 can z. B. be a yarn. It is preferably moved through the passage opening 26 in the longitudinal direction x.
  • textile materials such as the yarn 9 and other materials can charge electrostatically.
  • Such a charge can z. B. come through friction on machine parts such as balloon limiters, thread tensioner or guide eyelets.
  • polypropylene an undesirable impurity that is an existing need of the textile industry to detect, charges negatively, i. H. in a layer on the surface of the polypropylene is formed
  • the measuring capacitor 2 is now suitable for the detection of such charges.
  • Passage opening 26 arrive.
  • This potential change can be effected by means of an output line 27, which, for example, with the second Capacitor plate 22 is connected to be recorded as an electrostatic signal from the yarn 9.
  • contactless signal recording it is possible to record the electrostatic signal by means of a contact electrode (not shown) which is in galvanic contact with the yarn.
  • This alternative can have the advantage of being more sensitive.
  • Their disadvantages, however, are the inevitable abrasion of the electrode and yarn, which soils the device and wears the electrode, and the constant contact which is difficult to ensure at high yarn speeds. For this reason alone, the contactless signal recording appears to be more advantageous.
  • Another reason for using the measuring capacitor 2 for recording the electrostatic signal is the usability of the same measuring capacitor 2 for receiving a further, capacitive signal, as will be explained below.
  • another signal is received by the yarn 9.
  • the further signal is a capacitive signal.
  • the yarn 9 is exposed to a high-frequency alternating electric field in the measuring capacitor 2, and properties of the alternating electric field interacting with the yarn 9 are determined.
  • the middle capacitor plate 22 is common to both capacitors 2, 3.
  • EP-O '924' 513 A1 Methods and devices for the capacitive detection and quantification of solid foreign substances in textile test material 9 are known from EP-O '924' 513 A1 and can also be adopted for the present invention.
  • EP-O '924' 513 A1 and in particular paragraphs [0022] - [0034] thereof are incorporated by reference into the present specification.
  • EP-O '924' 513 Al here is a detailed description of the evaluation methods is unnecessary. For that, only so much is said here that at least two measurement modes are possible. In a first measurement mode is measured with two different excitation or carrier frequencies of the alternating electric field. The two similar output signals, z. B. measured voltages are first detected separately for each of the carrier frequencies and then combined together for evaluation in a suitable manner.
  • a second measurement mode is measured at a single carrier frequency, but used as output signals output voltage and output current.
  • the phase shift between the voltage and the Current signal supplies the desired information about the yarn 9 after suitable evaluation.
  • a combination of the two measuring modes, ie measurement at several carrier frequencies and measurement of the respective phase shifts between voltage and current signal, is also possible.
  • the device 1 for the purpose of capacitive signal recording, the device 1 according to the invention comprises an AC voltage generator 4 for applying a high-frequency AC voltage to the measuring capacitor 2 and the reference capacitor 3.
  • High frequency is understood here to mean a frequency between 100 kHz and 300 GHz according to the common usage in electrical engineering.
  • the frequency of the applied alternating voltage is between 1 MHz and 100 MHz, eg 10 MHz.
  • the impedance converter 5 can be designed, for example, as a collector circuit or as a transimpedance amplifier circuit with an operational amplifier Kon capacitors 2, 3.
  • the detector circuit 6 essentially performs a multiplication of the output signal of Measuring capacitor 2 with the voltage applied to the capacitors 2, 3 AC signal to demodulate it.
  • the demodulated capacitive measurement signal is fed to an evaluation circuit 7.
  • the electrostatic signal is quasi-static. It can be detected with a bandwidth of, for example, 5 to 10 kHz.
  • a peak value rectifier 8 is used, which is electrically connected to the output line 27 of the measuring capacitor 2 and preferably downstream of the impedance converter 5.
  • the output signal of the peak value rectifier 8 is likewise supplied to the evaluation circuit 7.
  • the evaluation circuit 7 determines from the electrostatic signal and the capacitive signal, the actual result, namely the foreign matter components in the yarn 9, and outputs an output signal on a réelle1eitung 79 of the device. It is possible to determine the quantitative proportion of foreign substances and possibly the material of the foreign substances, as well as other parameters such as the yarn thickness.
  • the evaluation circuit 7 may be formed as an analog electrical circuit or as a digital processor. It can be part of a user-specific integrated circuit (ASIC), on which also other elements like the Impedance converter 5, the detector circuit 6 and / or the peak value rectifier 8 can be integrated.
  • the evaluation circuit 7 may include a first module 71 for the evaluation of the electrostatic signal and a second module 72 for the evaluation of the further signal.
  • FIG. 2 shows schematically a flow chart of a preferred embodiment of the method according to the invention.
  • an electrostatic signal from the test material 9 is received 101, namely of such excess charges, which were previously already present on the test material.
  • Another signal is taken from the test object, 102.
  • the further signal can be a capacitive signal.
  • the recording 101 of the electrostatic signal can take place by means of the device 1 shown in FIG. 1 and in particular by the measuring capacitor 2, the impedance converter 5 and the peak value rectifier 8.
  • the recording 102 of the further signal can be effected by means of the device 1 shown in FIG. 1 and in particular by the measuring capacitor 2, the impedance converter 5 and the detector circuit 6.
  • the electrostatic signal is continuously evaluated 103, for example in the first module 71 of the evaluation circuit 7 (see FIG. 1).
  • the result of the evaluation 103 is constantly checked for a particular event 104. What is classified as a "special event" depends on the particular application, there may be a deviation from a target value, an override. or falling below a limit value, a sudden signal change, a signal change whose derivative exceeds or falls below a predetermined value, or be another characteristic of the evaluation result.
  • the determination 104 of a particular event triggers the evaluation 105 of the further signal, for example in the second module 72 of the evaluation circuit 7 (see FIG. 1).
  • the result of this evaluation 105 is now also checked for a particular event 106, which may be defined according to the same or different criteria as the particular event 104 in the electrostatic signal. If no special event is detected 106, this indicates a false indication of the electrostatic signal, z. B. due to electrostatic discharges, and the Signalaufnähme 101, 102 is continued. If, on the other hand, the evaluation 105 of the further signal also indicates a special event 106, there is a high probability of contamination by foreign substances in the relevant yarn section.
  • the evaluation unit 7 outputs a foreign substance signal on the output line 79 from 107.
  • the foreign substance signal can be a simple signal that triggers a yarn cut in the sense of a binary yes / no decision, activates a counting step, triggers an alarm or leads to a shutdown of the machine.
  • it may also contain information about the type and / or amount of the detected foreign substances, or impurity components.
  • impurities can be determined by the evaluation unit 7 on the basis of the evaluations of both signals.
  • the signal recording 101, 102 are continued, which is not shown in FIG. 2 for the sake of simplicity.
  • the further signal can be electrical, optical or other type.
  • the order of the process steps does not necessarily correspond to that of FIG. 2; the recording 102 of the further signal could, for. B. only after the detection 104 of a particular event in the electrostatic signal. It is also possible first to check the further signal 106 and only then the electrostatic signal 104 for a special event.
  • the signal recordings 101, 102, the signal evaluations 103, 105 and / or the checks 104, 106 can also take place simultaneously. List of reference numbers:

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

L'invention concerne un dispositif (1) pour détecter des matières étrangères dans un échantillon de contrôle (9) allongé, solide et en déplacement, par exemple, un fil. Ce dispositif comporte un capteur (2) pour recevoir un signal électrostatique de l'échantillon de contrôle (9). Le capteur (2) est conçu pour recevoir un signal électrostatique de charges excessives existant déjà dans l'échantillon de contrôle (9). Ce dispositif (1) comporte également un capteur (2) pour recevoir un autre signal capacitif de l'échantillon de contrôle (9), ainsi que des moyens d'analyse (7) pour analyser le signal électrostatique et l'autre signal et détecter des matières étrangères. La combinaison du signal électrostatique et de l'autre signal permet d'améliorer la sélectivité, des erreurs de fonctionnement sont ainsi réduites et la fiabilité et la sensibilité sont augmentées.
EP06741631A 2005-06-15 2006-06-07 Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement Withdrawn EP1893996A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09009532A EP2108949A1 (fr) 2005-06-15 2006-06-07 Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH10192005 2005-06-15
PCT/CH2006/000306 WO2006133584A1 (fr) 2005-06-15 2006-06-07 Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP09009532A Division EP2108949A1 (fr) 2005-06-15 2006-06-07 Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement

Publications (1)

Publication Number Publication Date
EP1893996A1 true EP1893996A1 (fr) 2008-03-05

Family

ID=36702697

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06741631A Withdrawn EP1893996A1 (fr) 2005-06-15 2006-06-07 Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement
EP09009532A Withdrawn EP2108949A1 (fr) 2005-06-15 2006-06-07 Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP09009532A Withdrawn EP2108949A1 (fr) 2005-06-15 2006-06-07 Procede et dispositif pour detecter des matieres etrangeres dans un echantillon de controle allonge, solide et en deplacement

Country Status (4)

Country Link
EP (2) EP1893996A1 (fr)
JP (1) JP2008546915A (fr)
CN (1) CN101180535B (fr)
WO (1) WO2006133584A1 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE102008047336B4 (de) 2008-09-15 2010-05-12 Neumann Elektrotechnik Gmbh Verfahren zur berührungslosen Kontrolle der Dicke einer auf ein Garn aufgebrachten Präparationsschicht und Schaltungsanordnung zur Durchführung des Verfahrens
CH699753A1 (de) * 2008-10-16 2010-04-30 Uster Technologies Ag Vorrichtung und verfahren zum ausmessen einer kapazität.
CN104677955B (zh) * 2015-01-28 2017-09-29 华中科技大学 一种非金属杂质检测方法
CN105133104B (zh) * 2015-07-30 2018-03-13 江苏圣蓝科技有限公司 一种在线检测和清除紧密纺纱线网格圈故障纱疵的方法及其装置
DE102017126753A1 (de) * 2017-11-14 2019-05-29 Autefa Solutions Germany Gmbh Überwachungstechnik für Vliesfabrikationsanlagen
EP3751282B1 (fr) * 2019-06-14 2021-12-15 Gebrüder Loepfe AG Capteur de fil capacitif avec compensation de décalage
EP3594613B1 (fr) * 2019-11-18 2022-06-29 KARL MAYER STOLL R&D GmbH Capteur a mesure de l'usure d'une surface

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CH526459A (de) 1970-05-28 1972-08-15 Loepfe Ag Geb Einrichtung zur Überwachung eines Fadens, der von einer Ablaufstelle zu einer Auflaufstelle geführt ist
DE3215695A1 (de) 1982-04-27 1983-10-27 Gebrüder Frei GmbH & Co KG, 7470 Albstadt Elektronischer fadenwaechter zum ueberwachen des fadenlaufes bei textilmaschinen
DE9216181U1 (de) 1992-11-27 1993-02-18 Otto Stüber GmbH & Co KG, 73266 Bissingen Kapazitiver elektronischer Fadenwächter mit Dual-Elektroden
JPH08254504A (ja) * 1994-11-29 1996-10-01 Zellweger Luwa Ag 伸長された物体の特性を記録するための方法と装置
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EP0924513B1 (fr) * 1997-12-18 2009-11-25 Uster Technologies AG Méthode et appareil pour la mesure de la proportion des solides dans un échantillon
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Also Published As

Publication number Publication date
CN101180535B (zh) 2012-07-25
WO2006133584A1 (fr) 2006-12-21
CN101180535A (zh) 2008-05-14
EP2108949A1 (fr) 2009-10-14
JP2008546915A (ja) 2008-12-25

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