EP1513970B1 - Method and device for evaluating sensor signals in textile machinery - Google Patents

Method and device for evaluating sensor signals in textile machinery Download PDF

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Publication number
EP1513970B1
EP1513970B1 EP03732580A EP03732580A EP1513970B1 EP 1513970 B1 EP1513970 B1 EP 1513970B1 EP 03732580 A EP03732580 A EP 03732580A EP 03732580 A EP03732580 A EP 03732580A EP 1513970 B1 EP1513970 B1 EP 1513970B1
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Prior art keywords
signals
sensor
several
digital
signal
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German (de)
French (fr)
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EP1513970B2 (en
EP1513970A1 (en
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Chokri Cherif
Michael Ueding
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Rieter Ingolstadt GmbH
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Rieter Ingolstadt GmbH
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    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H5/00Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/32Regulating or varying draft
    • D01H5/38Regulating or varying draft in response to irregularities in material ; Measuring irregularities
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01GPRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/006On-line measurement and recording of process and product parameters

Definitions

  • the invention relates to a method for evaluating signals of a sensor, in particular a microwave sensor for detecting the thickness, mass, density and / or moisture of at least one sliver moving relative to the sensor on a drafting system, wherein a high frequency device associated with the sensor per unit time a number generated first signals on the current state of the at least one sliver in digital form and a corresponding device for evaluating signals of such a sensor.
  • the invention comprises a textile machine with such a device.
  • slivers which in their cross-section consist of a plurality of individual fibers, are often measured for their thickness, mass, density and / or moisture. This is necessary, for example, in the area of a drafting system, in order to draw one or more slivers, i. reduce the number or mass of their fibers in cross section.
  • the aim is often to produce a particularly uniform sliver, i. a sliver, which over its entire length as possible the same number of fibers or mass in cross-section.
  • Such drafting systems are used, for example, at the exit of cards, in lines or in spinning machines.
  • band sensors are arranged, for example, at distances, which measure the band thickness or the band mass and their fluctuations and pass on this information to a regulating unit. At least one of the drafting devices of the drafting system is activated via the regulating unit. In addition, it is often examined at the exit of the drafting equipment whether the stretching operation has been carried out as desired, i. whether the sliver was made uniform in terms of its mass.
  • a microwave sensor As a particularly advantageous sensor for measuring the fiber ribbon quality, a microwave sensor has been found (see, for example WO 00/12974 A ). With microwave sensors, the thickness, mass, density and / or humidity of one or more slivers moving in relation to the sensor can be determined very reliably.
  • the sensor delivers a large number of signals per unit of time, which provide information about the current state of the at least one sliver.
  • the signals are output by a microwave device - more precisely the microwave resonator - downstream high-frequency device in digital form and per unit time.
  • the disadvantage here is that when assigning the time-dependent signals to the corresponding location in the sliver, a large computational effort due to the wealth of information supplied is required.
  • the assignment of the signals to the location of the at least one sliver must be done exactly at the time when it is in the drafting system. This is difficult to realize, especially with very fast running slivers with the help of a microwave sensor at a reasonable cost.
  • a microwave sensor such as is used, for example, for measuring the moisture content of cigarette paper
  • a conventional textile machine for example a RB-type RSB-D 35 line from Rieter
  • the first digital signals delivered by the output of the high-frequency device are used analyzed according to frequency shift and half width and converted the corresponding values by means of a D / A converter into analog signals and then these analog signals switched to the regulating computer of the track, the input side has an A / D converter.
  • the digital output data of the Regulierrechners are then in turn converted by means of a DIA converter into analog signals and the analog input of the servo controller switched, which the lower input and middle rollers regulates.
  • This elaborate procedure is costly and erroneous because, for example, unwanted phase shifts and quantization errors occur.
  • the object of the present invention is thus to provide a fast, accurate and cost-effective evaluation method and a corresponding device, whereby the microwave technology can be used industrially in the evaluation of the sliver state.
  • the microwave sensor or the radio-frequency device assigned to it supplies a number of first signals in digital form, from which second digital signals are formed in accordance with a predetermined algorithm, which represent the instantaneous band fineness or the band mass of the at least one sliver.
  • the first digital signals representing the resonant curve in this case contain information about the phase shift and the half-width of the resonance signals of the micro-wave sensor. Using mathematical correlations, these signals can be used to calculate, in particular, the associated band fineness or band masses as second digital signals.
  • a second digital signal representing the instantaneous band mass or band fineness.
  • These second digital signals are then used to regulate the drafting system and / or to assess the fiber ribbon quality at the inlet or outlet of the drafting system.
  • the second digital signals are used in a particularly preferred embodiment without intermediate D / A conversion for calculating regulation values, which are referred to in this terminology as third digital signals, for setting the controllable drafting system.
  • this calculation can be performed by means of the same processor which also clocks the radio-frequency device and / or generates the second digital signals.
  • a separate processor is used to generate the third digital signals.
  • second digital signals for values of belt fineness or band weight
  • third digital signals for regulation values
  • the predetermined algorithm for converting the first digital to the second digital signals and possibly the algorithm for converting the second digital to the third digital signals is selected according to the requirements for the analysis of the state of the sliver, the speed of the passage of the sliver by the sensor and the processing speed of the computers using the algorithm.
  • the abundance of the first digital signals can be reduced to a few second digital signals.
  • the number of second signals is substantially less than the number of first signals, for example, 1/50 of the first signals. This allows less data to be handled by the computer's microprocessor.
  • the evaluated second signals can thus be passed on to the regulation more quickly.
  • the regulation of the sliver can respond more clearly if the number of signals to be processed is lower.
  • a data reduction can also take place in the case of quality monitoring at the outlet of the textile machine.
  • the algorithm for forming the second signal is a function of the speed of the sliver. For example, if the sliver passes faster along the sensor, this will require a larger number of second signals per unit of time than if the sliver is being produced at a slower delivery speed.
  • the algorithm for forming the second signal is dependent on the material of the sliver. Viscose, cotton, polyester or other materials react very differently to the drafting forces in the drafting system.
  • the different processing of the first digital signals can compensate for the speed of processing the signals or the size of the signals.
  • the mean value is formed from a predetermined number of first digital signals, which then represents the second digital signal. Short-term fluctuations in the state of the at least one sliver, which can be disregarded for the further processing or evaluation of the sliver or slivers, are averaged in this way and provide a sufficient description of the sliver state.
  • the skipped or mean value-forming first signals correspond to a predetermined length of the at least one sliver, then it can be assumed that in each case a measured value for characterizing the sliver state is formed according to this predetermined length.
  • a length between 1 and 10 mm of the at least one sliver has proven to be particularly advantageous, within which at least one status signal is to be generated.
  • a data reduction can alternatively or additionally also take place from the transition of the second to the third digital signals.
  • the above embodiments for processing the first digital signals to second digital signals are correspondingly transferable to the processing of the second digital signals to third digital signals.
  • the second or third digital signal may be converted into an analog signal before being used further.
  • the third digital signal it may, for example, be fed, after analog conversion, to a servocontroller which may be e.g. via a differential gear drives individual drafting rollers of the drafting system with varying speed.
  • a servocontroller which may be e.g. via a differential gear drives individual drafting rollers of the drafting system with varying speed.
  • individual drives are provided for the drafting rollers, which are arranged in corresponding control circuits and in which the controllers receive the signals.
  • the third signal can be further processed in an advantageous embodiment as a digital signal, preferably in a serving to adjust at least one drafting roller controller with digital inputs.
  • the controller may in turn be a servo controller or a controller for a single drive.
  • the device according to the invention for evaluating signals from a sensor whose resonator is assigned to said high-frequency device for generating a first digital signal from the high-frequency signals of the microwave sensor.
  • a high-frequency device is in particular a microwave card.
  • the device according to the invention has a processor unit for generating the second and possibly the third digital signal, wherein the second digital signal represents the instantaneous band fineness or band mass.
  • the sensor can be arranged at the inlet and / or at the outlet of the drafting system. Is he at the inlet of the When arranged in a drafting arrangement, it serves, in particular, to measure the at least one incoming sliver and to regulate the speed of drafting rollers of the drafting system. At the outlet, the sensor is used to check the quality of the drawn sliver. In addition, the signal can be used to control the drafting system.
  • the high-frequency device according to the invention is arranged in the immediate vicinity of the sensor, it is possible to use a particularly short cable connection between sensor and high-frequency device.
  • the cable which transmits high-frequency signals, acts as an antenna and could falsify the signals if it is too long.
  • the accuracy of the measurement of the sliver would suffer. Since the modern drafting systems work extremely accurately, this would lead to inadmissible measurement results, especially in the case of the highly precise regulating lines.
  • the immediate proximity of sensor and radio frequency device offers significant advantages in terms of precision of quality information about the leaking fiber sliver when the first digital signals produced by the radio frequency device are processed without data reduction to second digital signals.
  • the high-frequency devices and / or processor units for inlet and outlet sensors are connected to one another via communication lines.
  • the respective results of the evaluation of the sliver states before the drafting system and after the drafting system can be compared and corrected if necessary.
  • the resonators of the microwave sensors in contrast to the conventional sensors, can be arranged very close to the drafting system, it is possible to make the cable lengths correspondingly short so that no interference signals are generated or generated. For this reason, it is possible to combine the high-frequency devices and processor units of the inlet and outlet sensor in a single unit. Reaction rates due to processing times and production costs are thereby influenced favorably.
  • a single high-frequency device and / or a single processor unit is used for the inlet and outlet sensor. If the high-frequency device and the processor unit are designed so that they can process the incoming signals accordingly quickly, it may be sufficient to use only one device or unit which is responsible for both the inlet and the outlet sensor. With a reasonable division of the computing and storage capacity for the data of the inlet sensor on the one hand and the outlet sensor on the other hand costs for other high-frequency devices and processors can be saved.
  • the inlet sensor is used to generate signals which are used to regulate the drafting system.
  • the leakage sensor generally serves to generate signals for monitoring the quality of the hidden sliver. These signals can also be used to control the drafting system.
  • the digital data transfer is at least partially realized by means of bus systems, for example by means of CAN bus connections.
  • FIG. 1 a simplified block diagram of a drafting system 1 is shown with microwave sensors.
  • a sliver 2 runs in the direction of arrow and as a stretched sliver 2 'out again.
  • an inlet sensor 3 is arranged at the inlet of the drafting 1 at the inlet of the drafting 1 at the inlet of the drafting 1 .
  • the inlet sensor 3 operates with microwave technology and determines the state of the incoming slivers or fibers 2.
  • the signal generated by the downstream of the inlet sensor 3 processing unit 12 is passed to a controller 5 of the machine.
  • the signal of a downstream of a flow sensor 4 processing unit 12 ' is passed in the block diagram shown here.
  • the optional outlet sensor 4 is arranged here at the outlet of the drafting system 1. It is not necessary in every case that at the drafting 1 both an inlet and a
  • Outflow sensor 3, 4 are arranged. Usually, the outlet sensor 4 is only required if the Strecker portions the drafting system 1 is checked and evaluated or introduced into a control of the drafting system 1.
  • the digitally processed in the processing unit 12 signal is supplied from the output in the controller 5 of a regulation 6. If the controller 5 has an analog input, the signal is either correspondingly converted already in the processing unit 12 or first in the controller 5.
  • This analog signal of the regulation 6 is transmitted to a servo amplifier or servocontroller 8 and an associated servomotor 9.
  • the servomotor 9 drives via a differential gear 10 parts of the drafting system 1 with varying speed to compensate for different states of the slivers 2 at the inlet of the drafting system 1.
  • the signal of the processing unit 12 'of the microwave leakage sensor 4 is supplied to a quality monitor 7, which may also be integrated in the processing unit 12' in an embodiment not shown.
  • a quality monitor 7 may also be integrated in the processing unit 12' in an embodiment not shown.
  • statistical evaluations or visual representations of the achieved spread result can be generated. Alternatively or additionally, these results can be incorporated into the regulation 6 or a regulation of the drafting system 1.
  • FIG. 2 shows the basic structure of an electronic circuit for an inlet sensor 3 and a discharge sensor 4, of which in all figures, only the resonators are indicated.
  • the usual, required to produce the microwaves devices (microwave generator) and input and output elements, circulators, etc. are not shown for simplicity.
  • a processing unit 12 is connected with the inlet sensor 3.
  • a processor card 14 of a microprocessor a power supply 15 and possibly further, not shown evaluation or utilities or interfaces are arranged.
  • the analog signals generated by the inlet sensor 3 are supplied to the microwave card 13.
  • the microwave card 13 operates with high frequency technology. A short distance between the sensor 3 and the microwave card 13 is important, because of the short cable length possibly occurring interference signals and transmission errors can be avoided.
  • first digital signals are generated. These first digital signals are further processed in the subsequent processor card 14 into second digital signals. These second digital signals, which are generated according to a predetermined algorithm, represent the instantaneous belt fineness or band mass of the at least one sliver 2. From the second digital signals, third digital signals are calculated, which serve for the regulation of the drafting system 1, wherein the actual regulation signals either in digital form or can be converted into analog signals. A conversion into analog signals can present here either with the processor card 14 or in the regulation of the 6 FIG. 1 respectively.
  • the outlet sensor 4 also operates.
  • the signals of the outlet sensor 4 are fed to the microwave card 13 '.
  • These first digital signals are finally further processed in the processor card 14 'into second digital signals according to a predetermined here, possibly deviating from the inlet sensor 3 algorithm.
  • These further processed second signals are used to monitor the quality of the outgoing sliver 2 'and also represent the belt fineness or band mass.
  • a power supply and possibly other inputs or outputs are indicated by the box 15 '.
  • the algorithms for generating the second digital signal are preferably designed for data reduction of the first digital signals, wherein, for example, individual first digital signals are skipped or averaged. In this way, computer capacities can be saved or used for other tasks, for example the calculation of the third digital signals and / or the clocking of the microwave card (s) 13. The calculation of the third digital signals from the second digital signals can also benefit from a data reduction.
  • the algorithm for forming the second signal and / or the third signal may be a function of the speed of the at least one sliver 2 and / or dependent on its material.
  • FIG. 3 another embodiment is shown as a schematic diagram.
  • the evaluation units 13, 13 'and 14, 14' are arranged in a common processing unit 12 "
  • the microwave cards 13 of the inlet sensor and 13 'of the outlet sensor 4 communicate with one another and can thus exchange results and optionally use them for their own evaluation Processor card 14 of the inlet sensor 3 and the processor card 14 'of the outlet sensor 4.
  • These also communicate with each other and may optionally use the quality data of the expiring sliver 2' for the regulation signals
  • a fast data exchange and moreover a cost-effective construction is to be achieved.
  • FIG. 4 shows a further summary in the form of the processing unit 12 "'In a correspondingly powerful technique, it is sufficient if only one microwave card 13" and one processor card 14 "is used for the inlet sensor 3 and the outlet sensor 4.
  • the corresponding signals of the sensors 3 and 4 can be processed in a single microwave card 13 and transferred to the processor card 14.
  • the processor card 14 can simultaneously process the signals of the microwave card 13 and convert it into band fineness signals and then into regulation signals and quality monitoring signals (ie even fineness signals).
  • the evaluation of the signals of the inlet and outlet sensors 3, 4 can be carried out particularly quickly in this way
  • such a solution requires correspondingly powerful microwave and processor cards, which are mainly advantageous for very demanding applications.
  • FIG. 5 shows a further embodiment of the construction of a microwave sensor at the inlet and at the outlet in connection with the further processing of the signals.
  • the microwave card 13 is arranged.
  • only the microwave card 13 ' is provided.
  • the signal generated in the microwave card 13 or 13 ' is sent to a common processor card 14 "in a processing unit 12".
  • the common processor card 14 processes the data thus obtained Signals and passes them as regulatory signals, which were determined from initially calculated band fineness signals, or as quality monitoring signals (see arrow).
  • FIG. 6 An alternative embodiment is in FIG. 6 shown.
  • the common processor card 14 "only calculates the band fineness values of at least the signals of the inlet sensor 3. These fineness values represent either the second digital signals generated by the processor card 14" or are calculated from these second digital signals.
  • the belt fineness values are then supplied in digital form to a further processor unit 24 in order to calculate regulation values, which in the terminology selected represent the third digital signals, for setting the controllable drafting system (see arrow).
  • These regulatory values include, in particular, values concerning the point of use and / or regulatory intensity.
  • the signals from the outlet sensor 4 are processed either exclusively in the common processor card 14 "or in the processor unit 24.
  • a not-shown display is expediently connected to the processor card 14" and / or the processor unit 24 in order to enable an operator to visualize, if necessary. additionally with the possibility of entering machine parameter values via a user interface (s. FIG. 1 ).
  • the timing of the microwave cards is preferably taken over by one of the illustrated processor units or processor cards.
  • the present invention is not limited to the illustrated embodiments.
  • other than microwave sensors according to the invention Procedures are operated.
  • other combinations not described are included in the invention of the independent claims.
  • the invention can be used in particular with cards, tracks and combing machines with a drafting system.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

A method and device for the evaluation of signals of a sensor, in particular of a microwave sensor, is proposed for the detection of the thickness, mass, density and/or moisture of at least one fiber sliver moving relative to the sensor on drafting equipment. A high-frequency unit assigned to the sensor produces a number of first digital signals in digital form of the current state of the (at least one) fiber sliver. The method according to the invention is characterized in that a second digital signal, representing the current sliver thickness or sliver mass of the (at least one) fiber sliver and which is then used to control the drafting equipment and/or to judge the fiber sliver quality, is formed according to an algorithm from the first digital signals made available. In addition a suitable device for the evaluation of the signals of a sensor is proposed.

Description

Die Erfindung betrifft ein Verfahren zur Auswertung von Signalen eines Sensors, insbesondere eines Mikrowellensensors zur Erfassung der Dicke, Masse, Dichte und/oder Feuchtigkeit mindestens eines in Bezug auf den Sensor bewegten Faserbandes an einem Streckwerk, wobei eine dem Sensor zugeordnete Hochfrequenzeinrichtung pro Zeiteinheit eine Anzahl erster Signale über den aktuellen Zustand des mindestens einen Faserbandes in digitaler Form erzeugt sowie eine entsprechende Vorrichtung zur Auswertung von Signalen eines solchen Sensors. Weiterhin umfaßt die Erfindung eine Textilmaschine mit einer derartigen Vorrichtung.The invention relates to a method for evaluating signals of a sensor, in particular a microwave sensor for detecting the thickness, mass, density and / or moisture of at least one sliver moving relative to the sensor on a drafting system, wherein a high frequency device associated with the sensor per unit time a number generated first signals on the current state of the at least one sliver in digital form and a corresponding device for evaluating signals of such a sensor. Furthermore, the invention comprises a textile machine with such a device.

In der Textilindustrie werden Faserbänder, welche in ihrem Querschnitt aus einer Vielzahl einzelner Fasern bestehen, häufig auf ihre Dicke, Masse, Dichte und/oder Feuchtigkeit gemessen. Dies ist beispielsweise im Bereich eines Streckwerks erforderlich, um ein oder mehrere Faserbänder zu verstrecken, d.h. die Anzahl oder Masse ihrer Fasern im Querschnitt zu verringern. Ziel ist dabei häufig, ein besonders gleichmäßiges Faserband zu erzeugen, d.h. ein Faserband, welches über seine gesamte Länge möglichst die gleiche Faseranzahl oder Masse im Querschnitt aufweist. Derartige Streckwerke werden beispielsweise am Ausgang von Karden, in Strecken oder in Spinnmaschinen eingesetzt. Um die Bandmasseschwankungen der Faserbänder ausregulieren zu können, sind beispielsweise an Strecken Bandsensoren angeordnet, welche die Banddicke bzw. die Bandmasse und deren Schwankungen messen und diese Informationen an eine Reguliereinheit weitergeben. Über die Reguliereinheit wird mindestens eines der Verzugsorgane des Streckwerks angesteuert. Zusätzlich wird häufig am Ausgang der Streckwerke untersucht, ob der Streckvorgang wunschgemäß erfolgt ist, d.h. ob das Faserband bezüglich seiner Masse vergleichmäßigt wurde.In the textile industry, slivers, which in their cross-section consist of a plurality of individual fibers, are often measured for their thickness, mass, density and / or moisture. This is necessary, for example, in the area of a drafting system, in order to draw one or more slivers, i. reduce the number or mass of their fibers in cross section. The aim is often to produce a particularly uniform sliver, i. a sliver, which over its entire length as possible the same number of fibers or mass in cross-section. Such drafting systems are used, for example, at the exit of cards, in lines or in spinning machines. In order to be able to regulate the tape mass fluctuations of the fiber slivers, band sensors are arranged, for example, at distances, which measure the band thickness or the band mass and their fluctuations and pass on this information to a regulating unit. At least one of the drafting devices of the drafting system is activated via the regulating unit. In addition, it is often examined at the exit of the drafting equipment whether the stretching operation has been carried out as desired, i. whether the sliver was made uniform in terms of its mass.

Zur Messung der Banddickenschwankung sind insbesondere mechanische Abtastungen bekannt. Nachteilig sind diese mechanischen Abtastungen insbesondere bei extrem hohen Liefergeschwindigkeiten von mehr als 1.000 m pro Minute, wie sie in modernen Hochleistungsstrecken vorliegen. Außerdem ist die starke mechanische Verdichtung, welche bei den mechanischen Sensoren erforderlich ist, negativ für den anschließenden Verzugsvorgang.Mechanical measurements are known in particular for measuring the band-thickness fluctuation. These mechanical scannings are disadvantageous, in particular, at extremely high delivery speeds of more than 1,000 m per minute, as present in modern high-speed lines. In addition, the strong mechanical compression, which is required for the mechanical sensors, negative for the subsequent delay operation.

Neben der mechanischen Abtastung der Banddickenschwankungen sind Abtastprinzipien, wie die Banddicke berührungslos durchdringende optische Strahlung, kapazitiv oder pneumatisch arbeitende Meßmethoden, Röntgenstrahlung oder ähnliche Methoden bekannt geworden. Diese Meßmethoden weisen jedoch individuelle Nachteile auf, welche sie bisher für den dauerhaften industriellen Einsatz in der Textilindustrie nicht tauglich erscheinen ließen.In addition to the mechanical scanning of the tape thickness variations scanning principles, such as the tape thickness contact-free optical radiation, capacitive or pneumatic measuring methods, X-rays or similar methods have become known. However, these measuring methods have individual disadvantages, which made them previously unsuitable for permanent industrial use in the textile industry.

Als besonders vorteilhafter Sensor zur Messung der Faserbandqualität hat sich ein Mikrowellensensor herausgestellt (siehe z.B. WO 00/12974 A ). Mit Mikrowellensensoren läßt sich die Dicke, Masse, Dichte und/oder Feuchtigkeit eines oder mehrerer in Bezug auf den Sensor bewegten Faserbänder sehr zuverlässig feststellen. Der Sensor liefert pro Zeiteinheit eine große Anzahl von Signalen, welche Auskunft über den aktuellen Zustand des mindestens einen Faserbandes geben. Die Signale werden von einer dem Mikrowellensensor - genauer dem Mikrowellenresonator - nachgeschalteten Hochfrequenzeinrichtung in digitaler Form und pro Zeiteinheit ausgegeben. Nachteilig dabei ist es, daß bei einer Zuordnung der zeitabhängigen Signale zu der entsprechenden Stelle im Faserband ein großer rechnerischer Aufwand aufgrund der Fülle der gelieferten Informationen erforderlich ist. Zudem muß die Zuordnung der Signale zu der Stelle des mindestens einen Faserbandes genau zu dem Zeitpunkt erfolgen, zu dem es sich in dem Streckwerk befindet. Dies ist insbesondere bei sehr schnell laufenden Faserbändern mit Hilfe eines Mikrowellensensors bei vertretbaren Kostenaufwand schwierig zu realisieren.As a particularly advantageous sensor for measuring the fiber ribbon quality, a microwave sensor has been found (see, for example WO 00/12974 A ). With microwave sensors, the thickness, mass, density and / or humidity of one or more slivers moving in relation to the sensor can be determined very reliably. The sensor delivers a large number of signals per unit of time, which provide information about the current state of the at least one sliver. The signals are output by a microwave device - more precisely the microwave resonator - downstream high-frequency device in digital form and per unit time. The disadvantage here is that when assigning the time-dependent signals to the corresponding location in the sliver, a large computational effort due to the wealth of information supplied is required. In addition, the assignment of the signals to the location of the at least one sliver must be done exactly at the time when it is in the drafting system. This is difficult to realize, especially with very fast running slivers with the help of a microwave sensor at a reasonable cost.

Wird im übrigen ein Mikrowellensensor, wie er beispielsweise bekanntermaßen zur Feuchtigkeitsmessung von Zigarettenpapier eingesetzt wird, bei einer herkömmlichen Textilmaschine, beispielsweise einer Strecke des Typs RSB-D 35 der Firma Rieter, zum Einsatz gebracht, werden die ersten digitalen, vom Ausgang der Hochfrequenzeinrichtung gelieferten Signale nach Frequenzverschiebung und Halbwertsbreite analysiert und die entsprechenden Werte mittels eines D/A-Wandlers in analoge Signale gewandelt und diese analogen Signale anschließend auf den Regulierrechner der Strecke geschaltet, der eingangsseitig einen A/D-Wandler aufweist. Die digitalen Ausgangsdaten des Regulierrechners werden dann wiederum mit Hilfe eines DIA-Wandlers in analoge Signale umgeformt und dem analogen Eingang des Servoreglers aufgeschaltet, welcher die unteren Eingangs- und Mittelwalzen regelt. Diese aufwendige Prozedur ist kostenträchtig und fehlerbehaftet, da beispielsweise unerwünschte Phasenverschiebungen und Quantisierungsfehler auftreten.If, moreover, a microwave sensor, such as is used, for example, for measuring the moisture content of cigarette paper, is used in a conventional textile machine, for example a RB-type RSB-D 35 line from Rieter, the first digital signals delivered by the output of the high-frequency device are used analyzed according to frequency shift and half width and converted the corresponding values by means of a D / A converter into analog signals and then these analog signals switched to the regulating computer of the track, the input side has an A / D converter. The digital output data of the Regulierrechners are then in turn converted by means of a DIA converter into analog signals and the analog input of the servo controller switched, which the lower input and middle rollers regulates. This elaborate procedure is costly and erroneous because, for example, unwanted phase shifts and quantization errors occur.

Aufgabe der vorliegenden Erfindung ist es somit, ein schnelles, genaues und kostengünstiges Auswerteverfahren und eine entsprechende Vorrichtung zu schaffen, wodurch die Mikrowellentechnik bei der Beurteilung des Faserbandzustandes industriell einsetzbar ist.The object of the present invention is thus to provide a fast, accurate and cost-effective evaluation method and a corresponding device, whereby the microwave technology can be used industrially in the evaluation of the sliver state.

Die Aufgabe wird gelöst mit einem Verfahren und einer Vorrichtung mit den Merkmalen der unabhängigen Ansprüche.The object is achieved with a method and a device having the features of the independent claims.

Erfindungsgemäß liefert der Mikrowellensensor bzw. die ihm zugeordnete Hochfrequenzeinrichtung pro Zeiteinheit eine Anzahl erster Signale in digitaler Form, aus welchen gemäß einem vorbestimmten Algorithmus zweite digitale Signale gebildet werden, welche die momentane Bandfeinheit oder die Bandmasse des mindestens einen Faserbandes wiedergeben. Die den Resonanzkurvenverlauf repräsentierenden ersten digitalen Signale beinhalten hierbei Informationen zur Phasenverschiebung und zur Halbwertsbreite der Resonanzsignale des Mikröwellensensors. Aus diesen Signalen lassen sich anhand von mathematischen Korrelationen insbesondere die zugehörigen Bandfeinheiten oder Bandmassen als zweite digitale Signale berechnen.According to the invention, the microwave sensor or the radio-frequency device assigned to it supplies a number of first signals in digital form, from which second digital signals are formed in accordance with a predetermined algorithm, which represent the instantaneous band fineness or the band mass of the at least one sliver. The first digital signals representing the resonant curve in this case contain information about the phase shift and the half-width of the resonance signals of the micro-wave sensor. Using mathematical correlations, these signals can be used to calculate, in particular, the associated band fineness or band masses as second digital signals.

Im Gegensatz zum Stand der Technik werden somit keine einzelnen Parameter zur Frequenzverschiebung und Halbwertsbreite in analoger Form ausgegeben, sondern ein zweites digitales Signal, das die momentane Bandmasse oder Bandfeinheit wiedergibt. Diese zweiten digitalen Signale werden anschließend zur Regulierung des Streckwerks und/oder zur Beurteilung der Faserbandqualität am Ein- oder Auslauf des Streckwerks verwendet. Hierbei werden die zweiten digitalen Signale in einer besonders bevorzugten Ausführungsform ohne zwischenzeitliche D/A-Wandlung zur Berechnung von Regulierungswerten, welche in dieser Terminologie als dritte digitale Signale bezeichnet werden, zur Einstellung des regelbaren Streckwerks verwendet. Diese Berechnung kann aus Kostengründen mittels desselben Prozessors vorgenommen werden, welcher auch die Hochfrequenzeinrichtung taktet und/oder die zweiten digitalen Signale erzeugt. In einer Alternative wird zur Erzeugung der dritten digitalen Signale ein separater Prozessor verwendet.In contrast to the prior art, therefore, no individual parameters for frequency shifting and half-width are output in analog form, but a second digital signal representing the instantaneous band mass or band fineness. These second digital signals are then used to regulate the drafting system and / or to assess the fiber ribbon quality at the inlet or outlet of the drafting system. In this case, the second digital signals are used in a particularly preferred embodiment without intermediate D / A conversion for calculating regulation values, which are referred to in this terminology as third digital signals, for setting the controllable drafting system. For reasons of cost, this calculation can be performed by means of the same processor which also clocks the radio-frequency device and / or generates the second digital signals. In an alternative, a separate processor is used to generate the third digital signals.

Die Bezeichnung "zweite digitale Signale" (für Werte zur Bandfeinheit oder zur Bandmasse) und "dritte digitale Signale" (für Regulierungswerte) sind selbstverständlich dahingehend zu verstehen, daß digitale Zwischensignale zwischen dem ersten und dem zweiten bzw. dem zweiten und dem dritten Signal erzeugt werden können.The term "second digital signals" (for values of belt fineness or band weight) and "third digital signals" (for regulation values) are understood to mean, of course, that intermediate digital signals are generated between the first and second and second and third signals, respectively can be.

Zwischen den ersten und den zweiten digitalen Signalen sowie bevorzugt zwischen den zweiten und den dritten digitalen Signalen findet demnach keine Umwandlung in analoge Signale statt. Es handelt sich dann um eine reine digitale Verarbeitung der von dem Sensor gelieferten Signale. Der vorbestimmte Algorithmus zur Umwandlung der ersten digitalen in die zweiten digitalen Signale und ggf. der Algorithmus zur Umwandlung der zweiten digitalen in die dritten digitalen Signale wird ausgewählt entsprechend den Anforderungen an die Analyse des Zustandes des Faserbandes, die Geschwindigkeit des Durchlaufs des Faserbandes durch den Sensor und die Verarbeitungsgeschwindigkeit der Computer, welche den Algorithmus anwenden.Accordingly, no conversion into analog signals takes place between the first and the second digital signals, and preferably between the second and the third digital signals. It is then a pure digital processing of the signals supplied by the sensor. The predetermined algorithm for converting the first digital to the second digital signals and possibly the algorithm for converting the second digital to the third digital signals is selected according to the requirements for the analysis of the state of the sliver, the speed of the passage of the sliver by the sensor and the processing speed of the computers using the algorithm.

Mit dem erfindungsgemäßen Verfahren kann die Fülle der ersten digitalen Signale auf wenige zweite digitale Signale reduziert werden. Im allgemeinen ist daher die Anzahl der zweiten Signale wesentlich geringer als die Anzahl der ersten Signale, beispielsweise 1/50 der ersten Signale. Hierdurch ist eine geringere Datenflut von dem Mikroprozessor des Computers zu bewältigen. Die ausgewerteten zweiten Signale können somit schneller an die Regulierung weitergegeben werden. Darüber hinaus kann die Regulierung des Faserbandes eindeutiger reagieren, wenn die Anzahl der zu verarbeitenden Signale geringer ist.With the method according to the invention, the abundance of the first digital signals can be reduced to a few second digital signals. In general, therefore, the number of second signals is substantially less than the number of first signals, for example, 1/50 of the first signals. This allows less data to be handled by the computer's microprocessor. The evaluated second signals can thus be passed on to the regulation more quickly. In addition, the regulation of the sliver can respond more clearly if the number of signals to be processed is lower.

Eine Datenreduktion kann auch im Falle der Qualitätsüberwachung am Auslauf der Textilmaschine erfolgen. Es ist jedoch vorteilhaft, bei Bildung der zweiten digitalen Signale aus den ersten digitalen Signalen keine derartige große oder gar keine Reduktion vorzunehmen, sondern mehr Informationen bzw. alle Informationen zu verarbeiten, um - bei einer Abtastrate von beispielsweise 10 kHz - hochpräzise CV-Wertberechnungen und Spektrogramme im kurzwelligen Wellenlängenbereich zu erhalten.A data reduction can also take place in the case of quality monitoring at the outlet of the textile machine. However, it is advantageous to make no such large or no reduction in the formation of the second digital signals from the first digital signals, but to process more information or all information to - at a sampling rate of, for example, 10 kHz - high-precision CV value calculations and To obtain spectrograms in the shortwave wavelength range.

Bei der kostengünstigen Verwendung lediglich eines Prozessors zur Berechnung der zweiten digitalen Signale aus den Daten eines einlaufseitigen Sensors einerseits (mit Datenreduktion) und eines auslaufseitigen Sensors andererseits (ohne Datenreduktion), steht für die Qualitätsüberwachung der Daten des auslaufseitigen Sensors eine relativ große Rechenkapazität zur Verfügung. Auf diese Weise sind Dick- und Dünnstellen, am Auslauf präzise erfaßbar.In the cost-effective use of only one processor for calculating the second digital signals from the data of an inlet-side sensor on the one hand (with data reduction) and one outlet-side sensor on the other hand (without data reduction), For the quality monitoring of the data of the outlet side sensor a relatively large computing capacity is available. In this way, thick and thin areas, at the outlet precisely detectable.

Vorteilhafterweise ist der Algorithmus zur Bildung des zweiten Signals eine Funktion der Geschwindigkeit des Faserbandes. Dies bedeutet beispielsweise für den Fall, wenn das Faserband schneller an dem Sensor entlang läuft, daß eine größere Anzahl.zweiter Signale pro Zeiteinheit benötigt wird, als wenn das Faserband mit einer geringeren Liefergeschwindigkeit produziert wird.Advantageously, the algorithm for forming the second signal is a function of the speed of the sliver. For example, if the sliver passes faster along the sensor, this will require a larger number of second signals per unit of time than if the sliver is being produced at a slower delivery speed.

Für einzelne Anwendungsfälle ist es vorteilhaft, wenn der Algorithmus zur Bildung des zweiten Signals abhängig vom Material des Faserbandes ist. Viscose, Baumwolle, Polyester oder andere Materialien reagieren sehr unterschiedlich auf die Verzugskräfte im Streckwerk. Die unterschiedliche Verarbeitung der ersten digitalen Signale kann hier hinsichtlich der Geschwindigkeit der Verarbeitung der Signale oder auch der Größe der Signale einen Ausgleich schaffen.For individual applications, it is advantageous if the algorithm for forming the second signal is dependent on the material of the sliver. Viscose, cotton, polyester or other materials react very differently to the drafting forces in the drafting system. The different processing of the first digital signals can compensate for the speed of processing the signals or the size of the signals.

Besonders vorteilhaft ist es, wenn jeweils eine vorbestimmte Anzahl erster Signale unter Berücksichtigung der Materialgeschwindigkeit übersprungen wird, und daß das so ausgewählte Signal als zweites Signal dient. Dies bedeutet, daß aus der zur Verfügung gestellten großen Anzahl erster digitaler Signale nur einzelne Signale ausgewählt werden. Dies reduziert die Menge der Signale und somit den Aufwand bei der Weiterverarbeitung. Wird beispielsweise nur jedes 50. erste Signal ausgewählt, so ist der Weiterverarbeitungsaufwand entsprechend geringer. Bei einer Vielzahl der Anwendungen führt dies trotzdem zu sehr guten Ergebnissen und Aussagen über den Zustand des mindestens einen Faserbandes.It is particularly advantageous if in each case a predetermined number of first signals is skipped, taking into account the material speed, and that the signal thus selected serves as a second signal. This means that only individual signals are selected from the large number of first digital signals made available. This reduces the amount of signals and thus the effort in further processing. If, for example, only every 50th first signal is selected, the further processing effort is correspondingly lower. Nevertheless, in a large number of applications, this leads to very good results and statements about the state of the at least one fiber sliver.

In einer weiteren vorteilhaften Ausgestaltung wird aus einer vorbestimmter Anzahl erster digitaler Signale der Mittelwert gebildet, welcher sodann das zweite digitale Signal darstellt. Kurzzeitige Schwankungen im Zustand des mindestens einen Faserbandes, welche für die Weiterverarbeitung oder Bewertung des oder der Faserbänder unberücksichtigt bleiben können, werden auf diese Weise gemittelt und stellen eine ausreichende Beschreibung des Faserbandzustandes dar.In a further advantageous embodiment, the mean value is formed from a predetermined number of first digital signals, which then represents the second digital signal. Short-term fluctuations in the state of the at least one sliver, which can be disregarded for the further processing or evaluation of the sliver or slivers, are averaged in this way and provide a sufficient description of the sliver state.

Entsprechen die übersprungenen oder den Mittelwert bildenden ersten Signale einer vorbestimmten Länge des mindestens einen Faserbandes, so kann davon ausgegangen werden, daß entsprechend dieser vorbestimmten Länge jeweils ein Meßwert zur Charakterisierung des Faserbandzustandes gebildet wird. Als besonders vorteilhaft hat sich eine Länge zwischen 1 und 10 mm des mindestens einen Faserbandes erwiesen, innerhalb welcher zumindest ein Zustandssignal erzeugt werden soll.If the skipped or mean value-forming first signals correspond to a predetermined length of the at least one sliver, then it can be assumed that in each case a measured value for characterizing the sliver state is formed according to this predetermined length. A length between 1 and 10 mm of the at least one sliver has proven to be particularly advantageous, within which at least one status signal is to be generated.

Eine Datenreduktion kann alternativ oder zusätzlich auch vom Übergang der zweiten zu den dritten digitalen Signalen erfolgen. Die obigen Ausführungen zur Verarbeitung der ersten digitalen Signale zu zweiten digitalen Signalen sind entsprechend übertragbar auf die Verarbeitung der zweiten digitalen Signale zu dritten digitalen Signalen.A data reduction can alternatively or additionally also take place from the transition of the second to the third digital signals. The above embodiments for processing the first digital signals to second digital signals are correspondingly transferable to the processing of the second digital signals to third digital signals.

Bei entsprechend ausgebildeten Einrichtungen, welche das zweite bzw. das dritte Signal verarbeiten müssen, kann es angebracht sein, wenn das zweite bzw. dritte digitale Signal vor seiner Weiterverwendung in ein analoges Signal umgewandelt wird. Im Falle des dritten digitalen Signals kann es nach Analogwandlung beispielsweise einem Servoregler zugeführt werden, welcher z.B. über ein Differentialgetriebe einzelne Streckwerkswalzen des Streckwerks mit variierender Geschwindigkeit antreibt. In einer Alternative sind Einzelantriebe für die Streckwerkswalzen vorgesehen, die in entsprechenden Regelkreisen angeordnet sind und bei denen die Regler die Signale erhalten.In the case of correspondingly configured devices which have to process the second or the third signal, it may be appropriate for the second or third digital signal to be converted into an analog signal before being used further. In the case of the third digital signal, it may, for example, be fed, after analog conversion, to a servocontroller which may be e.g. via a differential gear drives individual drafting rollers of the drafting system with varying speed. In an alternative, individual drives are provided for the drafting rollers, which are arranged in corresponding control circuits and in which the controllers receive the signals.

Statt der Umwandlung in ein analoges Signal kann das dritte Signal in einer vorteilhaften Ausführungsform als digitales Signal weiterverarbeitet werden, vorzugsweise in einem zur Einstellung mindestens einer Streckwerkswalze dienenden Regler mit digitalen Eingängen. Der Regler kann hierbei wiederum ein Servoregler oder ein Regler für einen Einzelantrieb sein.Instead of the conversion into an analog signal, the third signal can be further processed in an advantageous embodiment as a digital signal, preferably in a serving to adjust at least one drafting roller controller with digital inputs. The controller may in turn be a servo controller or a controller for a single drive.

Bei der erfindungsgemäßen Vorrichtung zur Auswertung von Signalen eines Sensors ist dessen Resonator die genannte Hochfrequenzeinrichtung zur Erzeugung eines ersten digitalen Signals aus den Hochfrequenzsignalen des Mikrowellensensors zugeordnet. Eine derartige Hochfrequenzeinrichtung stellt insbesondere eine Mikrowellenkarte dar. Weiterhin weist die erfindungsgemäße Vorrichtung eine Prozessoreinheit zur Erzeugung des zweiten und ggf. des dritten digitalen Signals auf, wobei das zweite digitale Signal die momentane Bandfeinheit oder Bandmasse repräsentiert. Der Sensor kann am Einlauf und/oder am Auslauf des Streckwerks angeordnet sein. Ist er am Einlauf des Streckwerks angeordnet, so dient er insbesondere der Messung des mindestens einen einlaufenden Faserbandes und der Regulierung der Geschwindigkeit von Streckwerkwalzen des Streckwerks. Am Auslauf wird der Sensor zur Überprüfung der Qualität des verstreckten Faserbandes verwendet. Darüber hinaus kann das Signal zur Regelung des Streckwerks verwendet werden.In the device according to the invention for evaluating signals from a sensor whose resonator is assigned to said high-frequency device for generating a first digital signal from the high-frequency signals of the microwave sensor. Such a high-frequency device is in particular a microwave card. Furthermore, the device according to the invention has a processor unit for generating the second and possibly the third digital signal, wherein the second digital signal represents the instantaneous band fineness or band mass. The sensor can be arranged at the inlet and / or at the outlet of the drafting system. Is he at the inlet of the When arranged in a drafting arrangement, it serves, in particular, to measure the at least one incoming sliver and to regulate the speed of drafting rollers of the drafting system. At the outlet, the sensor is used to check the quality of the drawn sliver. In addition, the signal can be used to control the drafting system.

Ist die Hochfrequenzeinrichtung gemäß der Erifindung in unmittelbarer Nähe des Sensors angeordnet, so ist es möglich, eine besonders kurze Kabelverbindung zwischen Sensor und Hochfrequenzeinrichtung zu verwenden. Das Kabel, welches Hochfrequenzsignale überträgt, wirkt als Antenne und könnte bei einer zu großen Länge die Signale verfälschen. Die Genauigkeit der Messung des Faserbandes würde darunter leiden. Nachdem die modernen Streckwerke extrem genau arbeiten, würde dies zu unzulässigen Meßergebnissen, insbesondere bei den hochpräzisen Regulierstrecken, führen. Im Falle eines Auslaufsensors bietet zudem die unmittelbare Nähe von Sensor und Hochfrequenzeinrichtung erhebliche Vorteile hinsichtlich der Präzision der Qualitätsinformationen über das auslaufende Faserband, wenn die von der Hochfrequenzeinrichtung erzeugten ersten digitalen Signale ohne Datenreduktion zu zweiten digitalen Signalen verarbeitet werden.If the high-frequency device according to the invention is arranged in the immediate vicinity of the sensor, it is possible to use a particularly short cable connection between sensor and high-frequency device. The cable, which transmits high-frequency signals, acts as an antenna and could falsify the signals if it is too long. The accuracy of the measurement of the sliver would suffer. Since the modern drafting systems work extremely accurately, this would lead to inadmissible measurement results, especially in the case of the highly precise regulating lines. Moreover, in the case of a leakage sensor, the immediate proximity of sensor and radio frequency device offers significant advantages in terms of precision of quality information about the leaking fiber sliver when the first digital signals produced by the radio frequency device are processed without data reduction to second digital signals.

Als besonders vorteilhaft hat sich erwiesen, den Abstand der Hochfrequenzeinrichtung von dem Sensor, d.h. insbesondere die Kabellänge zwischen Hochfrequenzeinrichtung und Sensor möglichst kurz, jedoch nicht länger als 1,5 m zu wählen. Je kürzer das Kabel ist, desto präziser und mit geringeren Übertragungsfehlern können die analogen Mikrowellenresonanzsignale an die Hochfrequenzeinrichtung übertragen werden und somit eine entsprechend präzisere Messung des Faserbandes bewirken.It has proven particularly advantageous to reduce the distance of the radio-frequency device from the sensor, i. in particular, to choose the cable length between the radio-frequency device and the sensor as short as possible, but not longer than 1.5 m. The shorter the cable, the more precise and with less transmission errors, the analog microwave resonance signals can be transmitted to the high-frequency device and thus cause a correspondingly more precise measurement of the sliver.

Besonders vorteilhaft ist es, wenn die Hochfrequenzeinrichtungen und/oder Prozessoreinheiten für Einlauf- und Auslaufsensor über Kommunikationsleitungen miteinander verbunden sind. Die jeweiligen Ergebnisse der Auswertung der Faserbandzustände vor dem Streckwerk und nach dem Streckwerk können verglichen und gegebenenfalls korrigiert werden. Es besteht hierdurch auch die Möglichkeit einen geschlossenen Regelkreis zu bilden, um eine präzise Vergleichmäßigung des Faserbandes zu ermöglichen.It is particularly advantageous if the high-frequency devices and / or processor units for inlet and outlet sensors are connected to one another via communication lines. The respective results of the evaluation of the sliver states before the drafting system and after the drafting system can be compared and corrected if necessary. As a result, it is also possible to form a closed loop in order to allow a precise homogenization of the sliver.

Besonders kostengünstig ist es, wenn die Hochfrequenzeinrichtungen und/oder Prozessoreinheiten für Einlauf- und Auslaufsensor in einer Baueinheit zusammengefaßtIt is particularly cost-effective if the high-frequency devices and / or processor units for inlet and outlet sensors are combined in one structural unit

sind. Nachdem die Resonatoren der Mikrowellensensoren im Gegensatz zu den herkömmlichen Sensoren sehr nahe an dem Streckwerk,angeordnet werden können, ist es möglich, die Kabellängen entsprechend kurz auszuführen, so daß keine Störsignale einwirken oder erzeugt werden. Aus diesem Grunde ist es möglich, die Hochfrequenzeinrichtungen und Prozessoreinheiten des Einlauf- und Auslaufsensors in einer Baueinheit zusammenzufassen. Reaktionsgeschwindigkeiten auf Grund von Verarbeitungszeiten und Herstellkosten werden hierdurch günstig beeinflußt.are. Since the resonators of the microwave sensors, in contrast to the conventional sensors, can be arranged very close to the drafting system, it is possible to make the cable lengths correspondingly short so that no interference signals are generated or generated. For this reason, it is possible to combine the high-frequency devices and processor units of the inlet and outlet sensor in a single unit. Reaction rates due to processing times and production costs are thereby influenced favorably.

Mit einer entsprechend hochwertigen Technik ist es auch möglich und im Einzelfall vorteilhaft, wenn für den Einlauf- und Auslaufsensor eine einzige Hochfrequenzeinrichtung und/oder eine einzige Prozessoreinheit verwendet wird. Sind die Hochfrequenzeinrichtung und die Prozessoreinheit so ausgeführt, daß sie die eingehenden Signale entsprechend schnell verarbeiten können, so kann es ausreichend sein, jeweils nur eine Einrichtung bzw. Einheit zu verwenden, welche sowohl für den Einlauf- als auch für den Auslaufsensor zuständig ist. Bei einer sinnvollen Aufteilung der Rechen- und Speicherkapazität für die Daten des Einlaufsensors einerseits und des Auslaufsensors andererseits können somit Kosten für weitere Hochfrequenzeinrichtungen und Prozessoren eingespart werden.With a correspondingly high-quality technology, it is also possible and advantageous in individual cases if a single high-frequency device and / or a single processor unit is used for the inlet and outlet sensor. If the high-frequency device and the processor unit are designed so that they can process the incoming signals accordingly quickly, it may be sufficient to use only one device or unit which is responsible for both the inlet and the outlet sensor. With a reasonable division of the computing and storage capacity for the data of the inlet sensor on the one hand and the outlet sensor on the other hand costs for other high-frequency devices and processors can be saved.

Auch für den Fall, daß eine Prozessoreinheit für die Erzeugung der zweiten sowie der dritten digitalen Signale (sowie ggf. zusätzlich für die Taktung der Hochfrequenzeinrichtung) zuständig ist, welche von den Signalen eines Einlaufsensors stammen, ist eine effiziente Aufteilung der Speicher- und Rechenleistung sinnvoll. Wird beispielsweise nur jedes fünfte Signal der ersten digitalen Signale zur Erzeugung des zweiten digitalen Signals verwendet, bleibt in aller Regel genügend Rechenleistung zur Berechnung der dritten digitalen Signale, d.h. der Regulierungswerte.Even in the event that a processor unit for the generation of the second and the third digital signals (and possibly additionally for the timing of the high-frequency device) is responsible, which come from the signals of an inlet sensor, an efficient division of the memory and computing power makes sense , For example, if only every fifth signal of the first digital signals is used to generate the second digital signal, sufficient computing power will generally remain to compute the third digital signals, i. the regulatory values.

Vorteilhafterweise dient der Einlaufsensor zur Erzeugung von Signalen, welche zur Regulierung des Streckwerks verwendet werden. Der Auslaufsensor dient im allgemeinen der Erzeugung von Signalen zur Qualitätsüberwachung des versteckten Faserbandes. Diese Signale können zusätzlich verwendet werden zur Regelung des Streckwerks.Advantageously, the inlet sensor is used to generate signals which are used to regulate the drafting system. The leakage sensor generally serves to generate signals for monitoring the quality of the hidden sliver. These signals can also be used to control the drafting system.

Vorteilhafterweise wird der digitale Datentransfer zumindest teilweise mittels Bussystemen realisiert, z.B. mittels CAN-Busverbindungen.Advantageously, the digital data transfer is at least partially realized by means of bus systems, for example by means of CAN bus connections.

Weitere Vorteile der Erfindung sind in Verbindung mit den nachfolgenden Ausführungsbeispielen beschrieben. Es zeigen:

Figur 1
ein vereinfachtes Blockbild eines Streckwerks mit Mikrowellensensoren;
Figur 2
eine Prinzipdarstellung einer Elektronikschaltung mit Mikrowellensensor am Einlauf und am Auslauf eines Streckwerks;
Figur 3
eine Prinzipdarstellung einer zusammengefaßten Elektronikschaltung für einen Ein- und einen Auslaufsensor;
Figur 4
eine Prinzipdarstellung einer einzigen Verarbeitungseinrichtung für einen Ein- und einen Auslaufsensor;
Figur 5
eine Prinzipdarstellung einer teilweise getrennt aufgebauten Elektronik- schaltung für einen Ein- und einen Auslaufsensor, und
Figur 6
eine Prinzipdarstellung einer teilweise getrennt aufgebauten Elektronik- schaltung für einen Ein- und einen Auslaufsensor mit einer zusätzlichen Prozessoreinheit.
Further advantages of the invention are described in connection with the following exemplary embodiments. Show it:
FIG. 1
a simplified block diagram of a drafting system with microwave sensors;
FIG. 2
a schematic diagram of an electronic circuit with microwave sensor at the inlet and at the outlet of a drafting system;
FIG. 3
a schematic diagram of a combined electronic circuit for an inlet and a outlet sensor;
FIG. 4
a schematic diagram of a single processing device for an inlet and a outlet sensor;
FIG. 5
a schematic diagram of a partially separately constructed electronic circuit for an inlet and a outlet sensor, and
FIG. 6
a schematic diagram of a partially separately constructed electronic circuit for an input and a leakage sensor with an additional processor unit.

In Figur 1 ist ein vereinfachtes Blockbild eines Streckwerks 1 mit Mikrowellensensoren dargestellt. In das Streckwerk 1 läuft ein Faserband 2 in Pfeilrichtung hinein und als verstrecktes Faserband 2' wieder heraus. Üblicherweise befinden sich am Einlauf des Streckwerks 1 mehrere Faserbänder 2, welche durch das Streckwerk 1 zu einem Faserband 2' am Auslauf des Streckwerks 1 zusammengefaßt bzw. verstreckt wurden.In FIG. 1 a simplified block diagram of a drafting system 1 is shown with microwave sensors. In the drafting 1 a sliver 2 runs in the direction of arrow and as a stretched sliver 2 'out again. Usually located at the inlet of the drafting 1 more slivers 2, which were summarized or stretched by the drafting 1 to a sliver 2 'at the outlet of the drafting system.

Am Einlauf des Streckwerks 1 ist ein Einlaufsensor 3 angeordnet. Der Einlaufsensor 3 arbeitet mit Mikrowellentechnologie und ermittelt den Zustand des oder der einlaufenden Faserbänder 2. Das von der dem Einlaufsensor 3 nachgeschalteten Verarbeitungseinheit 12 erzeugte Signal wird an eine Steuerung 5 der Maschine weitergeleitet. In die Steuerung 5 wird bei dem hier dargestellten Blockbild auch das Signal einer dem einem Auslaufsensor 4 nachgeschalteten Verarbeitungseinheit 12' geleitet. Der fakultative Auslaufsensor 4 ist hierbei am Auslauf des Streckwerks 1 angeordnet ist. Es ist nicht in jedem Falle erforderlich, daß an dem Streckwerk 1 sowohl ein Einlauf- als auch einAt the inlet of the drafting 1 an inlet sensor 3 is arranged. The inlet sensor 3 operates with microwave technology and determines the state of the incoming slivers or fibers 2. The signal generated by the downstream of the inlet sensor 3 processing unit 12 is passed to a controller 5 of the machine. In the control 5, the signal of a downstream of a flow sensor 4 processing unit 12 'is passed in the block diagram shown here. The optional outlet sensor 4 is arranged here at the outlet of the drafting system 1. It is not necessary in every case that at the drafting 1 both an inlet and a

Auslaufsensor 3, 4 angeordnet sind. Üblicherweise ist der Auslaufsensor 4 nur dann erforderlich, wenn das Streckergebnis des Streckwerks 1 überprüft und ausgewertet oder in eine Regelung des Streckwerks 1 eingebracht werden soll.Outflow sensor 3, 4 are arranged. Usually, the outlet sensor 4 is only required if the Streckerergebnis the drafting system 1 is checked and evaluated or introduced into a control of the drafting system 1.

Das in der Verarbeitungseinheit 12 digital verarbeitete Signal wird von dessen Ausgang in der Steuerung 5 einer Regulierung 6 zugeführt. Weist die Steuerung 5 einen analogen Eingang auf, wird das Signal entweder schon in der Verarbeitungseinheit 12 entsprechend gewandelt oder auch erst in der Steuerung 5. Dieses analoge Signal der Regulierung 6 wird einem Servoverstärker bzw. Servoregler 8 und einem damit verbundenen Servomotor 9 übermittelt. Der Servomotor 9 treibt über ein Differentialgetriebe 10 Teile des Streckwerks 1 mit variierender Geschwindigkeit an, um unterschiedliche Zustände der Faserbänder 2 am Einlauf des Streckwerks 1 auszugleichen.The digitally processed in the processing unit 12 signal is supplied from the output in the controller 5 of a regulation 6. If the controller 5 has an analog input, the signal is either correspondingly converted already in the processing unit 12 or first in the controller 5. This analog signal of the regulation 6 is transmitted to a servo amplifier or servocontroller 8 and an associated servomotor 9. The servomotor 9 drives via a differential gear 10 parts of the drafting system 1 with varying speed to compensate for different states of the slivers 2 at the inlet of the drafting system 1.

Das Signal der Verarbeitungseinheit 12' des Mikrowellenauslaufsensors 4 wird einer Qualitätsüberwachung 7 zugeführt, die in einer nicht dargestellten Ausführungsform auch in der Verarbeitungseinheit 12' integriert sein kann. Hier können statistische Auswertungen oder visuelle Darstellungen des erzielten Streckergebnisses erzeugt werden. Alternativ oder zusätzlich können diese Ergebnisse in die Regulierung 6 oder eine Regelung des Streckwerks 1 einfließen.The signal of the processing unit 12 'of the microwave leakage sensor 4 is supplied to a quality monitor 7, which may also be integrated in the processing unit 12' in an embodiment not shown. Here, statistical evaluations or visual representations of the achieved spread result can be generated. Alternatively or additionally, these results can be incorporated into the regulation 6 or a regulation of the drafting system 1.

Die Bedienung und/oder Visualisierung der gewünschten und erhaltenen Streckergebnisse sowie eventuell die Eingabe verschiedener Parameter erfolgt über eine Bedienoberfläche 11, welche mit der Steuerung 5 verbunden ist.The operation and / or visualization of the desired and obtained Streckergebnisse and possibly the input of various parameters via a user interface 11, which is connected to the controller 5.

Figur 2 zeigt den prinzipiellen Aufbau einer Elektronikschaltung für einen Einlaufsensor 3 und einen Auslaufsensor 4, von denen in allen Figuren lediglich die Resonatoren angedeutet sind. Die üblichen, zur Erzeugung der Mikrowellen benötigten Einrichtungen (Mikrowellengenerator) sowie Ein- und Auskoppelelemente, Zirkulatoren usw. sind der Einfachheit nicht dargestellt. Mit dem Einlaufsensor 3 ist eine Verarbeitungseinheit 12 verbunden. In der Verarbeitungseinheit 12 sind eine als Mikrowellenkarte ausgebildete Hochfrequenzeinrichtung 13, eine Prozessorkarte 14 eines Mikroprozessors, eine Stromversorgung 15 und eventuell weitere, nicht dargestellte Auswerte- oder Versorgungseinrichtungen oder Schnittstellen angeordnet. Die mit dem Einlaufsensor 3 erzeugten analogen Signale werden der Mikrowellenkarte 13 zugeführt. Die Mikrowellenkarte 13 arbeitet mit Hochfrequenztechnik. Ein kurzer Abstand zwischen dem Sensor 3 und der Mikrowellenkarte 13 ist wichtig, da aufgrund der kurzen Kabellänge eventuell auftretende Störsignale und Übertragungsfehler vermieden werden können. Mit Hilfe der Mikrowellenkarte 13 werden erste digitale Signale erzeugt. Diese ersten digitalen Signale werden in der darauffolgenden Prozessorkarte 14 weiter verarbeitet in zweite digitale Signale. Diese zweiten digitalen Signale, welche nach einem vorbestimmten Algorithmus erzeugt werden, repräsentieren die momentane Bandfeinheit oder Bandmasse des mindestens einen Faserbandes 2. Aus den zweiten digitalen Signale werden dritte digitale Signale berechnet, welche zur Regulierung des Streckwerks 1 dienen, wobei die eigentlichen Regulierungssignale entweder in digitaler Form bleiben oder auch in analoge Signale umgewandelt werden können. Eine Umwandlung in analoge Signale kann vorliegend entweder mit der Prozessorkarte 14 oder in der Regulierung 6 der Figur 1 erfolgen. FIG. 2 shows the basic structure of an electronic circuit for an inlet sensor 3 and a discharge sensor 4, of which in all figures, only the resonators are indicated. The usual, required to produce the microwaves devices (microwave generator) and input and output elements, circulators, etc. are not shown for simplicity. With the inlet sensor 3, a processing unit 12 is connected. In the processing unit 12 designed as a microwave card high-frequency device 13, a processor card 14 of a microprocessor, a power supply 15 and possibly further, not shown evaluation or utilities or interfaces are arranged. The analog signals generated by the inlet sensor 3 are supplied to the microwave card 13. The microwave card 13 operates with high frequency technology. A short distance between the sensor 3 and the microwave card 13 is important, because of the short cable length possibly occurring interference signals and transmission errors can be avoided. With the help of the microwave card 13 first digital signals are generated. These first digital signals are further processed in the subsequent processor card 14 into second digital signals. These second digital signals, which are generated according to a predetermined algorithm, represent the instantaneous belt fineness or band mass of the at least one sliver 2. From the second digital signals, third digital signals are calculated, which serve for the regulation of the drafting system 1, wherein the actual regulation signals either in digital form or can be converted into analog signals. A conversion into analog signals can present here either with the processor card 14 or in the regulation of the 6 FIG. 1 respectively.

Mit einem ähnlichen Aufbau wie beim Einlaufsensor 3 arbeitet auch der Auslaufsensor 4. Die Signale des Auslaufsensor 4 werden der Mikrowellenkarte 13' zugeführt. Diese ersten digitalen Signale werden schließlich in der Prozessorkarte 14' in zweite digitale Signale gemäß einem auch hier vorbestimmten, gegebenenfalls von dem Einlaufsensor 3 abweichenden Algorithmus weiter verarbeitet. Diese weiterverarbeiteten zweiten Signale dienen der Qualitätsüberwachung des auslaufenden Faserbandes 2' und repräsentieren ebenfalls die Bandfeinheit oder Bandmasse. Eine Stromversorgung und eventuell weitere Ein- oder Ausgänge sind mit dem Kasten 15' angedeutet.With a similar structure as in the inlet sensor 3, the outlet sensor 4 also operates. The signals of the outlet sensor 4 are fed to the microwave card 13 '. These first digital signals are finally further processed in the processor card 14 'into second digital signals according to a predetermined here, possibly deviating from the inlet sensor 3 algorithm. These further processed second signals are used to monitor the quality of the outgoing sliver 2 'and also represent the belt fineness or band mass. A power supply and possibly other inputs or outputs are indicated by the box 15 '.

Die Algorithmen zur Erzeugung des zweiten digitalen Signals sind vorzugsweise zur Datenreduzierung der ersten digitalen Signale ausgelegt, wobei beispielsweise einzelne erste digitale Signale übersprungen oder gemittelt werden. Hierdurch lassen sich Rechnerkapazitäten sparen bzw. für andere Aufgaben einsetzen, beispielsweise der Berechnung der dritten digitalen Signale und/oder der Taktung der Mikrowellenkarte(n) 13. Auch die Berechnung der dritten digitalen Signale aus den zweiten digitalen Signalen kann von einer Datenreduktion Gebrauch maschen.The algorithms for generating the second digital signal are preferably designed for data reduction of the first digital signals, wherein, for example, individual first digital signals are skipped or averaged. In this way, computer capacities can be saved or used for other tasks, for example the calculation of the third digital signals and / or the clocking of the microwave card (s) 13. The calculation of the third digital signals from the second digital signals can also benefit from a data reduction.

Des weiteren kann der Algorithmus zur Bildung des zweiten Signals und/oder des dritten Signals eine Funktion der Geschwindigkeit des mindestens einen Faserbandes 2 und/oder abhängig von dessen Material sein.Furthermore, the algorithm for forming the second signal and / or the third signal may be a function of the speed of the at least one sliver 2 and / or dependent on its material.

In Figur 3 ist ein weiteres Ausführungsbeispiel als Prinzipskizze dargestellt. Die Auswerteeinheiten 13, 13' und 14, 14' sind in einer gemeinsamen Verarbeitungseinheit 12" angeordnet. Die Mikrowellenkarten 13 des Einlaufsensors und 13' des Auslaufsensors 4 kommunizieren miteinander und können somit Ergebnisse austauschen und gegebenenfalls für die eigene Auswertung einsetzen. Gleiches gilt für die Prozessorkarte 14 des Einlaufsensors 3 und die Prozessorkarte 14' des Auslaufsensors 4. Auch diese kommunizieren miteinander und können gegebenenfalls die Qualitätsdaten des auslaufenden Faserbandes 2' für die Regulierungssignale einsetzen. Auch ist es bei einer derartigen Verschaltung der Prozessorkarten 14, 14' gegebenenfalls möglich, deren Rechenkapazitäten besser auszunutzen. Bei einer derartigen Bauausführung ist ein schneller Datenaustausch und darüber hinaus eine kostengünstige Bauweise zu erzielen. In den meisten Fällen ist es ausreichend, eine gemeinsame Stromversorgung und Datenschnittstelle 15" einzusetzen.In FIG. 3 another embodiment is shown as a schematic diagram. The evaluation units 13, 13 'and 14, 14' are arranged in a common processing unit 12 "The microwave cards 13 of the inlet sensor and 13 'of the outlet sensor 4 communicate with one another and can thus exchange results and optionally use them for their own evaluation Processor card 14 of the inlet sensor 3 and the processor card 14 'of the outlet sensor 4. These also communicate with each other and may optionally use the quality data of the expiring sliver 2' for the regulation signals In such a construction, a fast data exchange and moreover a cost-effective construction is to be achieved.In most cases it is sufficient to use a common power supply and data interface 15 ".

Figur 4 zeigt eine weitere Zusammenfassung in Form der Verarbeitungseinheit 12"'. Bei einer entsprechend leistungsfähigen Technik ist es ausreichend, wenn lediglich eine Mikrowellenkarte 13" und eine Prozessorkarte 14" für den Einlaufsensor 3 und den Auslaufsensor 4 verwendet wird. Die entsprechenden Signale der Sensoren 3 und 4 können in einer einzigen Mikrowellenkarte 13" verarbeitet und an die Prozessorkarte 14" übergeben werden. Die Prozessorkarte 14" kann gleichzeitig die Signale der Mikrowellenkarte 13" verarbeiten und einerseits in Bandfeinheitssignale und anschließend in Regulierungssignale und andererseits in Qualitätsüberwachungssignale (also auch Bandfeinheitssignale) umwandeln. Die Auswertung der Signale des Einlauf- und Auslaufsensors 3, 4 ist auf diese Weise besonders schnell durchführbar. Eine derartige Lösung erfordert jedoch entsprechend leistungsstarke Mikrowellen- und Prozessorkarten, welche hauptsächlich für sehr anspruchsvolle Anwendungen vorteilhaft sind. FIG. 4 shows a further summary in the form of the processing unit 12 "'In a correspondingly powerful technique, it is sufficient if only one microwave card 13" and one processor card 14 "is used for the inlet sensor 3 and the outlet sensor 4. The corresponding signals of the sensors 3 and 4 can be processed in a single microwave card 13 and transferred to the processor card 14. The processor card 14 can simultaneously process the signals of the microwave card 13 and convert it into band fineness signals and then into regulation signals and quality monitoring signals (ie even fineness signals). The evaluation of the signals of the inlet and outlet sensors 3, 4 can be carried out particularly quickly in this way However, such a solution requires correspondingly powerful microwave and processor cards, which are mainly advantageous for very demanding applications.

Figur 5 zeigt ein weiteres Ausführungsbeispiel des Aufbaus eines Mikrowellensensors am Einlauf und am Auslauf in Verbindung mit der Weiterverarbeitung der Signale. Am Einlaufsensor 3 ist lediglich die Mikrowellenkarte 13 angeordnet. Gleiches gilt für den Auslaufsensor 4. Auch hier ist lediglich die Mikrowellenkarte 13' vorgesehen. Die erforderlichen Kabellängen von dem Sensor 3, 4 zur jeweiligen Mikrowellenkarte 13 bzw. 13' können hierdurch sehr kurz gehalten werden. Das in der Mikrowellenkarte 13 bzw. 13' erzeugte Signal wird an eine gemeinsame Prozessorkarte 14" in einer Verarbeitungseinheit 12"" gesandt. Die gemeinsame Prozessorkarte 14" verarbeitet die so erhaltenen Signale und gibt sie als Regulierungssignale, die aus zunächst berechneten Bandfeinheitssignalen ermittelt wurden, oder als Qualitätsüberwachungssignate weiter (s. Pfeil). Bei dieser Ausführung der Erfindung ist lediglich ein leistungsstarker Mikroprozessor erforderlich, welcher die beiden Signale vom Einlaufsensor 3 und Auslaufsensor 4 schnell verarbeiten kann. Es kann eine einzige Stromversorgung 15" vorgesehen sein, welche über die Verbindungsleitungen auch die Sensoren 3, 4 und die entsprechenden Mikrowellenkarten 13 und 13' versorgt. FIG. 5 shows a further embodiment of the construction of a microwave sensor at the inlet and at the outlet in connection with the further processing of the signals. At the inlet sensor 3, only the microwave card 13 is arranged. The same applies to the outlet sensor 4. Again, only the microwave card 13 'is provided. The required cable lengths from the sensor 3, 4 to the respective microwave card 13 or 13 'can thereby be kept very short. The signal generated in the microwave card 13 or 13 'is sent to a common processor card 14 "in a processing unit 12". "The common processor card 14" processes the data thus obtained Signals and passes them as regulatory signals, which were determined from initially calculated band fineness signals, or as quality monitoring signals (see arrow). In this embodiment of the invention, only a powerful microprocessor is required, which can process the two signals from the inlet sensor 3 and outlet sensor 4 quickly. There may be a single power supply 15 "provided, which also supplies the sensors 3, 4 and the corresponding microwave cards 13 and 13 'via the connecting lines.

Eine alternative Ausführungsform ist in der Figur 6 dargestellt. Hierbei berechnet die gemeinsame Prozessorkarte 14" lediglich die Bandfeinheitswerte zumindest der Signale des Einlaufsensors 3. Diese Bandfeinheitswerte stellen entweder die von der Prozessorkarte 14" erzeugten zweiten digitalen Signale dar oder sind aus diesen zweiten digitalen Signalen berechnet. Die Bandfeinheitswerte werden dann in digitaler Form einer weiteren Prozessoreinheit 24 zugeführt, um Regulierungswerte, welche in der gewählten Terminologie die dritten digitalen Signale darstellen, zur Einstellung des regulierbaren Streckwerks zu berechnen (s. Pfeil). Zu diesen Regulierungswerten zählen insbesondere Werte bezüglich Regeleinsatzpunkt und/oder Regulierintensität. Die Signale vom Auslaufsensors 4 werden entweder ausschließlich in der gemeinsamen Prozessorkarte 14"oder in der Prozessoreinheit 24 verarbeitet. Mit der Prozessorkarte 14" und/oder der Prozessoreinheit 24 ist zweckmäßigerweise ein nicht dargestelltes Display verbunden, um einem Bediener eine Visualisierung zu ermöglichen, ggf. zusätzlich mit der Möglichkeit der Eingabe von Maschinen-Parameterwerten über eine Bedieneroberfläche (s. Figur 1).An alternative embodiment is in FIG. 6 shown. In this case, the common processor card 14 "only calculates the band fineness values of at least the signals of the inlet sensor 3. These fineness values represent either the second digital signals generated by the processor card 14" or are calculated from these second digital signals. The belt fineness values are then supplied in digital form to a further processor unit 24 in order to calculate regulation values, which in the terminology selected represent the third digital signals, for setting the controllable drafting system (see arrow). These regulatory values include, in particular, values concerning the point of use and / or regulatory intensity. The signals from the outlet sensor 4 are processed either exclusively in the common processor card 14 "or in the processor unit 24. A not-shown display is expediently connected to the processor card 14" and / or the processor unit 24 in order to enable an operator to visualize, if necessary. additionally with the possibility of entering machine parameter values via a user interface (s. FIG. 1 ).

Bei den in den Figuren dargestellten Ausführungsformen wird die Taktung der Mikrowellenkarten vorzugsweise von einem der dargestellten Prozessoreinheiten bzw. Prozessorkarten mitübernommen.In the embodiments illustrated in the figures, the timing of the microwave cards is preferably taken over by one of the illustrated processor units or processor cards.

Mittels der Erfindung ist es beispielsweise möglich, in einer vorbetrieblichen Phase automatische Maschineneinstellungen vorzunehmen, insbesondere den Regeleinsatzpunkt und die Regelintensität bei einem Regulierstreckwerk zumindest grob voreinzustellen.By means of the invention, it is possible, for example, to perform automatic machine adjustments in a pre-operational phase, in particular to preset at least roughly the control application point and the control intensity in a regulating drafting system.

Die vorliegende Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt. Insbesondere können auch andere als Mikrowellensensoren nach dem erfindungsgemäßen Verfahren betrieben werden. Auch sind weitere, nicht beschriebene Kombinationen im Rahmen der Erfindung von den unabhängigen Patentansprüchen mit umfaßt. Die Erfindung läßt sich insbesondere bei Karden, Strecken sowie Kämmmaschinen mit einem Streckwerk einsetzen.The present invention is not limited to the illustrated embodiments. In particular, other than microwave sensors according to the invention Procedures are operated. Also, other combinations not described are included in the invention of the independent claims. The invention can be used in particular with cards, tracks and combing machines with a drafting system.

Claims (24)

  1. Method for the evaluation of the signals of a sensor (3, 4,) in particular of a microwave sensor (3, 4) to determine the thickness, mass, density and/or moisture of at least one fiber sliver (2) conveyed relative to the sensor (3, 4) on a drafting system (1), whereby a high-frequency unit (13) assigned to the sensor (3, 4) produces a number of first digital signals per time unit on the current state of the at least one fiber sliver (2) in digital form, characterized in that a second digital signal is formed according to an algorithm from the first digital signals made available, this second signal representing the current sliver thickness or the sliver mass of the at least one fiber sliver (2) and which is used subsequently to control the drafting system (1) and/or to judge the fiber quality.
  2. Method according to claim 1, characterized in that a third digital signal is formed according to an algorithm from the second digital signal without any intervening conversion into analog signals, and in that this third digital signal represents control values for the control of the drafting system.
  3. Method according to claim 1 or 2, characterized in that the algorithm for the formation of the second signal and/or of the third signal is a function of the speed of the at least one fiber sliver (2).
  4. Method according to one or several of the preceding claims, characterized in that the algorithm for the formation of the second signal and/or of the third signal depends on the material of the at least one fiber sliver (2).
  5. Method according to one or several of the preceding claim, characterized in that each time a predetermined number of first signals is skipped and in that the signal thus selected serves as second signal.
  6. Method according to one or several of the previous claims, characterized in that each time a predetermined number of second signals is skipped and in that the signal thus selected serves as third signal.
  7. Process according to one or several of the preceding claims, characterized in that the mean value is formed from a predetermined number of first signals and serves as second signal.
  8. Method according to one or several of the preceding claims, characterized in that the mean value is formed from a predetermined number of second signals and serves as third signal.
  9. Method according to one or several of the preceding claims, characterized in that the skipped first or second signals or those constituting the mean value correspond to a predetermined length of the at least one fiber sliver (2), preferably a length between 1 mm and 10 mm.
  10. Method according to one or several of the preceding claims, characterized in that the second or third digital signal is converted into an analog signal before its further utilization.
  11. Method according to one or several of the preceding claims, characterized in that the third digital signal is switched in analog or digital form to the input of a controller for the control of the drafting system.
  12. Device for the evaluation of signals of a sensor (3, 4), in particular a microwave sensor (3, 4) to determine the thickness, mass, density and/or moisture of at least one fiber sliver (2) moving relative to the sensor (3, 4) in a drafting system (1), characterized in that the sensor (3, 4) is located at the inlet and/or outlet of the drafting system (1), in that the sensor (3, 4) is assigned a high-frequency unit (13) for the production of first digital signals and a processor unit (14) for the production of second digital signals from the first digital signals, whereby the second digital signals indicate the current sliver thickness or sliver mass and whereby at least the high-frequency unit (13) is located in immediate proximity of the sensor (3, 4).
  13. Device according to one or several of the preceding claims, characterized in that the processor unit (14) producing the second digital signals or an additional processor unit (24) for the calculation of leveling values in form of third digital signals is designed for the adjustment of the autoleveling drafting system (1) based on the digital sliver thickness or sliver mass values.
  14. Device according to one or several of the preceding claims, characterized in that the processor unit (14; 24) is designed for the reduction of the number of first or second digital signals by means of the algorithm.
  15. Device according to the preceding claim, characterized in that the distance between the high-frequency unit (13) and the sensor (3, 4) is no greater than 1.5 m.
  16. Device according to one or several of the preceding claims, characterized in that the high-frequency unit(s) (13) and/or processor unit(s) (14) of inlet and outlet sensor (3, 4) are connected to each other via communication lines.
  17. Device according to one or several of the preceding claims, characterized in that the high-frequency unit(s) (13) and/or processor unit(s) (14) are combined into one component (12) for inlet and outlet sensor (3,4).
  18. Device according to one or several of the preceding claims, characterized in that one single high-frequency unit (13) and/or processor unit (14) is provided for the inlet and the outlet sensor (3, 4).
  19. Device according to one or several of the preceding claims, characterized in that the inlet sensor (3) supplies signals for the control of the drafting system (1) and the outlet sensor (4) supplies signals for quality control of the at least one fiber sliver (2).
  20. Device according to one or several of the preceding claims, characterized in that the outlet sensor (4) supplies signals for the control of the drafting system (1).
  21. Device according to one or several of the preceding claims, characterized in that the inlet and/or the outlet sensor (3, 4) supplies signals for automatic adjustment of machine settings.
  22. Device according to one or several of the preceding claims, characterized in that the processor unit (14) is also designed to clock the high-frequency unit(s) (13), preferably at least one microwave card.
  23. Device according to one or several of the preceding claims, characterized in that one single processor unit (14) is provided for the clocking of the high-frequency unit(s) (13), to calculate the second digital and the third digital signals.
  24. Textile machine with a drafting system and a device according to one or several of the preceding claims.
EP03732580.0A 2002-06-20 2003-06-17 Method and device for evaluating sensor signals in textile machinery Expired - Lifetime EP1513970B2 (en)

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EP1513970B2 (en) 2015-02-11
CN100378260C (en) 2008-04-02
EP1513970A1 (en) 2005-03-16
DE50313328D1 (en) 2011-01-27
AU2003238513A1 (en) 2004-01-06
US20040060352A1 (en) 2004-04-01
CN1662691A (en) 2005-08-31
WO2004001110A1 (en) 2003-12-31
DE10227676A1 (en) 2004-01-08
US6880207B2 (en) 2005-04-19
ATE491831T1 (en) 2011-01-15

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