EP0340756B1 - Method and device for monitoring the levelling of at least one sliver in a controlled drafting arrangement - Google Patents

Method and device for monitoring the levelling of at least one sliver in a controlled drafting arrangement Download PDF

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Publication number
EP0340756B1
EP0340756B1 EP89108023A EP89108023A EP0340756B1 EP 0340756 B1 EP0340756 B1 EP 0340756B1 EP 89108023 A EP89108023 A EP 89108023A EP 89108023 A EP89108023 A EP 89108023A EP 0340756 B1 EP0340756 B1 EP 0340756B1
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Prior art keywords
limiting value
regulator
measuring member
comparison
working range
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EP89108023A
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German (de)
French (fr)
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EP0340756A1 (en
Inventor
Herbert König
Gerhard Stähle
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Truetzschler GmbH and Co KG
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Truetzschler GmbH and Co KG
Zinser Textilmaschinen GmbH
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    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H13/00Other common constructional features, details or accessories
    • D01H13/14Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/22Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material
    • 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

Definitions

  • the invention relates to a method and a device for monitoring the uniformity of at least one fiber structure in a regulating drafting system, in particular in a draw frame, wherein deviations in the mass of the fiber structure are detected by at least one measuring element and compensated for by a controller and at least one actuator.
  • regulating drafting devices have a regulating system for comparing fiber bundles, which detects and compensates for deviations in the mass of the fiber bundle from a desired value over short lengths.
  • This control system can be designed as a regulation or as a controller.
  • the regulating drafting units often have a further regulating system which records deviations over long lengths and essentially serves to keep numbers. This regulation system is always designed as a regulation.
  • the elements of these regulating systems can be subject to malfunctions which not only do not make the fiber structure uniform, but which even deteriorate the uniformity of the fiber structure. Such malfunctions are not readily recognizable with the help of previously known devices and methods and lead in particular to routes with their high Material throughput quickly to large quantities of defective products.
  • a device for titer regulation of the slivers on small, medium and long lengths of spinning preparation is already known from the prior art (CH-A 557895).
  • an input-side measuring element for detecting fiber sliver mass fluctuations is used, as well as an associated control device for controlling an output-side roller drive, the exact delay being controlled by a speed monitoring device on the drafting rollers.
  • a so-called transducer system is used here, which converts the distance between two opposing rollers through which a belt runs into an electrical signal.
  • fixed measured variables are used to obtain a strip of as constant a density as possible at the exit of a card and at the same time to ensure that the strip is evenly deposited in a rotary pot.
  • Another state of the art is a method for operating a section used for doubling and drawing fiber slivers (DE-A-3212891).
  • the individual fiber bands to be doubled are monitored separately for fluctuations in mass, in particular for the presence or absence of individual fiber bands, a signal being triggered when a predetermined fiber band thickness limit value is exceeded or undershot. This triggering is dependent on the input signals from the measuring elements.
  • a measuring element which consists of a light source, a band channel, an adjustment screen and two photocells (Melliand Textile Reports, 49, 5, page 525).
  • a beam of light penetrates the continuous belt in the belt channel and the setting screen and strikes one photo cell each.
  • Intermediate elements become electromagnetic Brakes actuated, which change the speed of discharge cylinders of a drafting system via an epicyclic gear mechanism and thereby influence the warpage in the desired sense.
  • the invention has for its object to provide a method and an apparatus of the type mentioned, in which malfunctions of control systems, such as measuring elements, controllers, actuators are easily recognizable and thus the operation of control systems can be better monitored.
  • the measured values of the measuring element and / or the control signals of the controller are compared with at least one adjustable limit value, a display and / or switching process being triggered when the limit value is exceeded.
  • the limit value is advantageously chosen such that it is not reached during normal operation of the regulating device. On the other hand, exceeding this draws the operator's attention to a possible malfunction of the regulating system or the measuring element.
  • the limit is chosen to be only slightly higher than the values which occur during normal operation, it is generally sufficient to draw the operator's attention to the signal. If, on the other hand, a significantly higher limit value is provided, it is advantageous to switch off the machine when it is exceeded. Both of the aforementioned limit values can also be monitored simultaneously.
  • the operator must check the feed belt: If its unevenness is greater than normal, the operation of the upstream machines must be checked. If, on the other hand, the unevenness of the Original material is normal, there is suspicion of malfunction of the regulating device and / or the measuring elements.
  • the fiber structure delivered by the regulating drafting device must be checked. If its mass fluctuation lies within the intended limit values, there is suspicion of a malfunction of the measuring element that detects long-period fluctuations - it thus indicates a deviation, which obviously does not exist. If, on the other hand, the intended limit values of the unevenness in the fiber structure are actually exceeded, there is suspicion of malfunction of the regulating system and / or of the measuring element that detects short-term fluctuations.
  • a regulating drafting system has two schematically illustrated roller pairs 1 and 2, which are each driven by drive motors 7 and 9 and drive shafts 6 and 8.
  • a fiber structure 3 runs through the two pairs of rollers 1 and 2.
  • the roller pairs 1 and 2 are preceded by a short-time measuring element 4, which is connected to a controller 10 via a line 15.
  • This controller 10 is connected via a line 21 to the drive 9 and via lines 18 and 20 with the drive 7 in operative connection.
  • the measured values of the measuring element 4 control the controller 10 in a manner known per se so that it influences the rotational speed of the drive motor 9 of the pair of rollers 1 via line 21 in the sense of reducing a deviation of the fiber structure 3 determined by the measuring element 4 from the predetermined desired value.
  • a long-term measuring element 5 is arranged behind the roller pairs 1 and 2 in the area of the fiber structure 3, which is connected to the controller 10 via lines 16 and 17. As described above for the measuring element 4, the measuring element 5 also influences the delivery speed of the pair of rollers by means of the controller 10 in the sense of reducing a detected strip weight deviation.
  • the measuring element 5 is connected via the line 16 to an actual-target comparison point 12, which is connected via a line 19 to an adjusting device 13 for the limit value range, as well as a setting switch 11 and a display device 14.
  • the measured values of the measuring element 5 are compared with the set limit value of the setting device 13, the display device 14 or a switching operation of the switching mechanism 11 being triggered when the limit value is exceeded, as a result of which the drives 7 and 9 are switched off.
  • the limit value set by the setting device 13 is exceeded, an operator is made aware of a possible malfunction of the regulating system or the measuring elements 4 or 5.
  • the limit value defined by the setting device 13 is only slightly higher than the normal value, it is sufficient if the signal lamp 14 lights up. If, on the other hand, a significantly higher limit value is provided, it is expedient to shut down the drives 7 and 9 of the regulating drafting device via the setting switch 11 in order to prevent the delivery of defective strip.
  • the line 21 between the controller 10 and the drive motor 9 is connected via a line 22 to an adjusting device 13 ⁇ for a wide limit range and a setting switch 11. Another connection is made via line 23 to a further adjusting device 13 'for a narrower area, this adjusting device 13 being connected to a signal lamp 14.
  • the control signal emitted by the controller 10 exceeds the limit set on the adjusting device 13 ', the normal working range of the control signals of the controller 10, the signal lamp 14 lights up. If, on the other hand, the limit value set on the adjusting device 13 ', the normal working range of the actuating signals is exceeded, the drive motors 9 and 7 of the roller pairs 1 and 2 are separated from the mains by the actuating switch 11 and stopped.
  • the operator must first check the supply belt 3 (arrow II). If the unevenness is greater than normal, the operation of the upstream machine must be checked. If, on the other hand, the unevenness of the original material is normal, there is suspicion of malfunction of the controller 10 or the measuring element 4.
  • FIG. 2 can be simplified in that only one adjusting device 13 analogous to the embodiment according to FIG. 1 is used.
  • the invention has the effect that the mode of operation of the regulating systems is monitored in a simple manner, malfunctions being recognized in good time and thus the manufacture of defective products being effectively avoided.

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

Description

Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zur Überwachung des Vergleichmäßigens mindestens eines Faserverbandes in einem Regulierstreckwerk, insbesondere in einer Strecke, wobei Abweichungen der Masse des Faserverbandes durch mindestens ein Meßglied erfaßt und über einen Regler und mindestens ein Stellglied ausgeglichen werden.The invention relates to a method and a device for monitoring the uniformity of at least one fiber structure in a regulating drafting system, in particular in a draw frame, wherein deviations in the mass of the fiber structure are detected by at least one measuring element and compensated for by a controller and at least one actuator.

Bei dem allgemein bekannten Stand der Technik weisen Regulierstreckwerke zum Vergleichmäßigen von Faserverbänden ein Reguliersystem auf, welches Abweichungen der Masse des Faserverbandes von einem Sollwert auf kurze Längen erfaßt und ausgleicht. Dieses Regelsystem kann als Regelung oder als Steuerung ausgebildet sein. Daneben weisen die Regulierstreckwerke häufig ein weiteres Reguliersystem auf, das Abweichungen auf großen Längen erfaßt und im wesentlichen zur Nummernhaltung dient. Dieses Reguliersystem ist stets als Regelung ausgebildet.In the generally known state of the art, regulating drafting devices have a regulating system for comparing fiber bundles, which detects and compensates for deviations in the mass of the fiber bundle from a desired value over short lengths. This control system can be designed as a regulation or as a controller. In addition, the regulating drafting units often have a further regulating system which records deviations over long lengths and essentially serves to keep numbers. This regulation system is always designed as a regulation.

Die Elemente dieser Reguliersysteme, wie beispielsweise Meßglieder, Regler und Stellglied, können Fehlfunktionen unterworfen sein, durch die nicht nur keine Vergleichmäßigung des Faserverbandes erzielt wird, sondern durch welche sogar die Gleichmäßigkeit des Faserverbandes eine Verschlechterung erfährt. Derartige Fehlfunktionen sind mit Hilfe bisher bekannter Vorrichtungen und Verfahren nicht ohne weiteres erkennbar und führen insbesondere an Strecken mit deren hohem Materialdurchsatz rasch zu großen Mengen fehlerhafter Produkte.The elements of these regulating systems, such as measuring elements, regulators and final control elements, can be subject to malfunctions which not only do not make the fiber structure uniform, but which even deteriorate the uniformity of the fiber structure. Such malfunctions are not readily recognizable with the help of previously known devices and methods and lead in particular to routes with their high Material throughput quickly to large quantities of defective products.

Zum Stand der Technik ist darüber hinaus bereits eine Vorrichtung für die Titerregulierung der Faserbänder auf kleinen, mittleren und großen Längen der Spinnereivorbereitung bekannt (CH-A 557895). Hierbei findet ein eingangsseitiges Meßglied zum Erfassen von Faserbandmasseschwankungen Anwendung sowie eine damit verbundene Steuereinrichtung zum Ansteuern eines ausgangsseitigen Walzenantriebes, wobei der exakte Verzug über eine Drehzahlüberwachungseinrichtung an Verzugswalzen kontrolliert wird. Hier findet ein sogenanntes Transduktorsystem Anwendung, welches den Abstand zwischen zwei einander gegenüberliegenden Rollen, durch den ein Band läuft, in ein elektrisches Signal umwandelt. Hier finden feste Meßgrößen Anwendung, um am Ausgang einer Karde ein Band möglichst konstanter Dichte zu erhalten und gleichzeitig eine gleichmäßige Ablage des Bandes in einem Drehtopf zu gewährleisten.In addition, a device for titer regulation of the slivers on small, medium and long lengths of spinning preparation is already known from the prior art (CH-A 557895). Here, an input-side measuring element for detecting fiber sliver mass fluctuations is used, as well as an associated control device for controlling an output-side roller drive, the exact delay being controlled by a speed monitoring device on the drafting rollers. A so-called transducer system is used here, which converts the distance between two opposing rollers through which a belt runs into an electrical signal. Here, fixed measured variables are used to obtain a strip of as constant a density as possible at the exit of a card and at the same time to ensure that the strip is evenly deposited in a rotary pot.

Weiterer Stand der Technik ist ein Verfahren zum Betreiben einer dem Doublieren und Verziehen von Faserbändern dienenden Strecke (DE-A-3212891). Bei dieser bekannten Einrichtung werden die zu doublierenden Einzelfaserbänder separat auf Masseschwankungen hin überwacht, insbesondere auf das Vorhanden- oder Nichtvorhandensein von Einzelfaserbändern, wobei bei Über- oder Unterschreiten eines vorbestimmten Faserbanddicke-Grenzwertes ein Signal ausgelöst wird. Diese Auslösung erfolgt in Abhängigkeit von den Eingangssignalen der Meßglieder.Another state of the art is a method for operating a section used for doubling and drawing fiber slivers (DE-A-3212891). In this known device, the individual fiber bands to be doubled are monitored separately for fluctuations in mass, in particular for the presence or absence of individual fiber bands, a signal being triggered when a predetermined fiber band thickness limit value is exceeded or undershot. This triggering is dependent on the input signals from the measuring elements.

Als weiterer Stand der Technik ist ein Meßorgan bekannt, welches aus Lichtquelle, Bandkanal, Einstellblende und zwei Photozellen besteht (Melliand Textilberichte, 49, 5, Seite 525). Hierbei durchdringt ein Lichtstrahl das durchlaufende Band im Bandkanal sowie die Einstellblende und trifft auf je eine Photozelle. Über Zwischenelemente werden elektromagnetische Bremsen betätigt, welche über ein Umlaufrädergetriebe die Drehzahl von Auslaufzylindern eines Streckwerkes verändern und dadurch den Verzug im gewünschten Sinne beeinflussen.As a further state of the art, a measuring element is known which consists of a light source, a band channel, an adjustment screen and two photocells (Melliand Textile Reports, 49, 5, page 525). Here, a beam of light penetrates the continuous belt in the belt channel and the setting screen and strikes one photo cell each. Intermediate elements become electromagnetic Brakes actuated, which change the speed of discharge cylinders of a drafting system via an epicyclic gear mechanism and thereby influence the warpage in the desired sense.

Demgegenüber liegt der Erfindung die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Art zu schaffen, bei welcher Fehlfunktionen von Reguliersystemen, beispielsweise Meßglieder, Regler, Stellglied auf einfache Weise erkennbar sind und damit die Arbeitsweise von Reguliersystemen besser überwacht werden kann.In contrast, the invention has for its object to provide a method and an apparatus of the type mentioned, in which malfunctions of control systems, such as measuring elements, controllers, actuators are easily recognizable and thus the operation of control systems can be better monitored.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Meßwerte des Meßgliedes und/oder die Stellsignale des Reglers mit mindestens einem einstellbaren Grenzwert verglichen werden, wobei bei Grenzwertüberschreitung eine Anzeige und/oder Schaltvorgang ausgelöst wird. Hierbei wird vorteilhafterweise der Grenzwert so gewählt, daß er bei normaler Arbeitsweise der Reguliervorrichtung nicht ereicht wird. Seine Überschreitung macht dagegen die Bedienungsperson auf eine mögliche Fehlfunktion des Reguliersystems bzw. des Meßgliedes aufmerksam.This object is achieved in that the measured values of the measuring element and / or the control signals of the controller are compared with at least one adjustable limit value, a display and / or switching process being triggered when the limit value is exceeded. In this case, the limit value is advantageously chosen such that it is not reached during normal operation of the regulating device. On the other hand, exceeding this draws the operator's attention to a possible malfunction of the regulating system or the measuring element.

Wenn der Grenzwert nur wenig höher gewählt wird, als die bei normalem Betrieb auftretenden Werte, ist es im allgemeinen ausreichend, durch das Signal die Bedienungsperson aufmerksam zu machen. Wenn dagegen ein wesentlich höherer Grenzwert vorgesehen wird, ist es vorteilhaft, die Maschine bei dessen Überschreiten abzustellen. Es können auch beide vorgenannten Grenzwerte gleichzeitig überwacht werden.If the limit is chosen to be only slightly higher than the values which occur during normal operation, it is generally sufficient to draw the operator's attention to the signal. If, on the other hand, a significantly higher limit value is provided, it is advantageous to switch off the machine when it is exceeded. Both of the aforementioned limit values can also be monitored simultaneously.

Bei Überschreiten des eingestellten Grenzwertes für das Stellsignal eines Meßliedes auf der Einlaufseite des Streckwerkes muß die Bedienungsperson das Vorlageband überprüfen: Wenn seine Ungleichmäßigkeit größer ist als normal, muß die Arbeitsweise der vorgeschalteten Maschinen überprüft werden. Wenn dagegen die Ungleichmäßigkeit des Vorlagematerials normal ist, besteht Verdacht auf Fehlfunktion der Reguliervorrichtung und/oder der Meßglieder.If the set limit for the control signal of a measuring element on the inlet side of the drafting system is exceeded, the operator must check the feed belt: If its unevenness is greater than normal, the operation of the upstream machines must be checked. If, on the other hand, the unevenness of the Original material is normal, there is suspicion of malfunction of the regulating device and / or the measuring elements.

Entsprechend ist bei einem Überschreiten des vorgesehenen Grenzwertes durch das langperiodische Schwankungen des Faserverbandes erfassenden Meßgliedes der vom Regulierstreckwerk abgelieferte Faserverband zu überprüfen. Wenn seine Masseschwankung innerhalb der vorgesehenen Grenzwerte liegt, besteht Verdacht auf Fehlfunktion des langperiodische Schwankungen erfassenden Meßgliedes ― es zeigt damit eine Abweichung an, welche ersichtlich nicht gegeben ist. Wenn dagegen die vorgesehenen Grenzwerte der Ungleichmäßigkeit im Faserverband tatsächlich überschritten sind, besteht Verdacht auf Fehlfunktion des Reguliersystems und/oder des kurzzeitige Schwankungen erfassenden Meßgliedes.Correspondingly, if the intended limit value is exceeded due to the measuring element detecting long-period fluctuations in the fiber structure, the fiber structure delivered by the regulating drafting device must be checked. If its mass fluctuation lies within the intended limit values, there is suspicion of a malfunction of the measuring element that detects long-period fluctuations - it thus indicates a deviation, which obviously does not exist. If, on the other hand, the intended limit values of the unevenness in the fiber structure are actually exceeded, there is suspicion of malfunction of the regulating system and / or of the measuring element that detects short-term fluctuations.

Die Erfindung wird nachfolgend anhand von in der Zeichnung dargestellten Ausführungsbeispielen näher beschrieben. In der Zeichnung zeigen:

Fig. 1 und 2
zwei schematische Seitenansichten eines Reguliersystems mit Vorrichtungen zur Überwachung des Vergleichmäßigens mindestens eines Faserverbandes.

The invention is described below with reference to exemplary embodiments shown in the drawing. The drawing shows:
1 and 2
two schematic side views of a regulating system with devices for monitoring the uniformity of at least one fiber structure.

Nach Fig. 1 weist ein Regulierstreckwerk zwei schematisch dargestellte Walzenpaare 1 und 2 auf, welche jeweils über Antriebsmotoren 7 und 9 und Antriebswellen 6 und 8 angetrieben werden. Durch die beiden Walzenpaare 1 und 2 läuft ein Faserverband 3.1, a regulating drafting system has two schematically illustrated roller pairs 1 and 2, which are each driven by drive motors 7 and 9 and drive shafts 6 and 8. A fiber structure 3 runs through the two pairs of rollers 1 and 2.

Bei der Ausführungsform nach Fig. 1 ist den Walzenpaaren 1 und 2 ein Kurzzeitmeßglied 4 vorgeschaltet, welches über eine Leitung 15 mit einem Regler 10 verbunden ist. Dieser Regler 10 steht über eine Leitung 21 mit dem Antrieb 9 und über Leitungen 18 und 20 mit dem Antrieb 7 in Wirkverbindung. Die Meßwerte des Meßgliedes 4 steuern den Regler 10 in an sich bekannter Weise so, daß er über die Leitung 21 die Drehzahl des Antriebsmotors 9 des Walzenpaares 1 im Sinne einer Verminderung einer vom Meßglied 4 ermittelten Abweichung des Faserverbandes 3 vom vorgegebenen Sollwert beeinflußt.In the embodiment according to FIG. 1, the roller pairs 1 and 2 are preceded by a short-time measuring element 4, which is connected to a controller 10 via a line 15. This controller 10 is connected via a line 21 to the drive 9 and via lines 18 and 20 with the drive 7 in operative connection. The measured values of the measuring element 4 control the controller 10 in a manner known per se so that it influences the rotational speed of the drive motor 9 of the pair of rollers 1 via line 21 in the sense of reducing a deviation of the fiber structure 3 determined by the measuring element 4 from the predetermined desired value.

Weiterhin ist hinter den Walzenpaaren 1 und 2 ein Langzeitmeßglied 5 im Bereich des Faserverbandes 3 angeordnet, welches über Leitungen 16 und 17 mit dem Regler 10 verbunden ist. Wie vorstehend für das Meßglied 4 beschrieben, beeinflußt so auch das Meßglied 5 über den Regler 10 die Liefergeschwindigkeit des Walzenpaares im Sinne einer Verminderung einer festgestellten Bandgewichtsabweichung.Furthermore, a long-term measuring element 5 is arranged behind the roller pairs 1 and 2 in the area of the fiber structure 3, which is connected to the controller 10 via lines 16 and 17. As described above for the measuring element 4, the measuring element 5 also influences the delivery speed of the pair of rollers by means of the controller 10 in the sense of reducing a detected strip weight deviation.

Erfindungsgemäß ist das Meßglied 5 über die Leitung 16 mit einem Ist-Soll-Vergleichspunkt 12 verbunden, der über eine Leitung 19 mit einer Einstellvorrichtung 13 für den Grenzwertbereich, sowie einem Stellschalter 11 und einer Anzeigevorrichtung 14 verbunden ist. Dadurch werden die Meßwerte des Meßgliedes 5 mit dem eingestellten Grenzwert der Einstellvorrichtung 13 verglichen, wobei bei Grenzwertüberschreitung die Anzeigevorrichtung 14 oder ein Schaltvorgang des Schaltwerkes 11 ausgelöst wird, wodurch die Antriebe 7 und 9 abgestellt werden. In diesem Fall ist zu überprüfen, ob bezüglich des Ausgabebandes der Toleranzbereich eingehalten wurde. Ist dies der Fall, so ist das Langzeitmeßsystem zu überprüfen (Pfeil I). Ist dies nicht der Fall, besteht Verdacht auf Fehlfunktion des Kurzzeitmeßgliedes 4 und/oder des Reglers 10, die dann zu überprüfen sind. Bei Überschreitung des durch die Einstellvorrichtung 13 eingestellten Grenzwertes wird also eine Bedienungsperson auf eine mögliche Fehlfunktion des Reguliersystems bzw. der Meßglieder 4 oder 5 aufmerksam gemacht.According to the invention, the measuring element 5 is connected via the line 16 to an actual-target comparison point 12, which is connected via a line 19 to an adjusting device 13 for the limit value range, as well as a setting switch 11 and a display device 14. As a result, the measured values of the measuring element 5 are compared with the set limit value of the setting device 13, the display device 14 or a switching operation of the switching mechanism 11 being triggered when the limit value is exceeded, as a result of which the drives 7 and 9 are switched off. In this case, check whether the tolerance range for the output belt has been observed. If this is the case, the long-term measuring system must be checked (arrow I). If this is not the case, there is suspicion of malfunction of the short-term measuring element 4 and / or the controller 10, which must then be checked. If the limit value set by the setting device 13 is exceeded, an operator is made aware of a possible malfunction of the regulating system or the measuring elements 4 or 5.

Liegt hierbei der durch die Einstellvorrichtung 13 definierte Grenzwert nur wenig höher als der Normalwert, genügt es, wenn die Signallampe 14 aufleuchtet. Ist dagegen ein wesentlich höherer Grenzwert vorgesehen, ist es zweckmäßig, über den Stellschalter 11 die Antriebe 7 und 9 des Regulierstreckwerkes stillzusetzen, um das Abliefern fehlerhaften Bandes zu verhindern.If the limit value defined by the setting device 13 is only slightly higher than the normal value, it is sufficient if the signal lamp 14 lights up. If, on the other hand, a significantly higher limit value is provided, it is expedient to shut down the drives 7 and 9 of the regulating drafting device via the setting switch 11 in order to prevent the delivery of defective strip.

Bei der Ausführungsform nach Fig. 2 ist die Leitung 21 zwischen Regler 10 und Antriebsmotor 9 über eine Leitung 22 mit einer Einstellvorrichtung 13˝ für einen weiten Grenzwertbereich und einem Stellschalter 11 verbunden. Eine weitere Verbindung besteht über die Leitung 23 mit einer weiteren Einstellvorrichtung 13′ für einen engeren Bereich, wobei diese Einstellvorrichtung 13 mit einer Signallampe 14 verbunden ist.In the embodiment according to FIG. 2, the line 21 between the controller 10 and the drive motor 9 is connected via a line 22 to an adjusting device 13˝ for a wide limit range and a setting switch 11. Another connection is made via line 23 to a further adjusting device 13 'for a narrower area, this adjusting device 13 being connected to a signal lamp 14.

Wenn das vom Regler 10 abgegebene Stellsignal den an der Einstellvorrichtung 13′ eingestellten, dem normalen Arbeitsbereich der Stellsignale des Reglers 10 näheren Grenzwert überschreitet, leuchtet die Signallampe 14 auf. Wenn dagegen der an der Einstellvorrichtung 13′ eingestellte, dem normalen Arbeitsbereich der Stellsignale fernere Grenzwert überschritten wird, werden die Antriebsmotoren 9 und 7 der Walzenpaare 1 und 2 durch den Stellschalter 11 vom Netz getrennt und stillgesetzt.When the control signal emitted by the controller 10 exceeds the limit set on the adjusting device 13 ', the normal working range of the control signals of the controller 10, the signal lamp 14 lights up. If, on the other hand, the limit value set on the adjusting device 13 ', the normal working range of the actuating signals is exceeded, the drive motors 9 and 7 of the roller pairs 1 and 2 are separated from the mains by the actuating switch 11 and stopped.

In beiden Fällen muß die Bedienungsperson zunächst das Vorlageband 3 überprüfen (Pfeil II). Ist die Ungleichmäßigkeit größer als normal, muß die Arbeitsweise der vorgeschalteten Maschine überprüft werden. Wenn dagegen die Ungleichmäßigkeit des Vorlagematerials normal ist, besteht Verdacht auf Fehlfunktion des Reglers 10 oder des Meßgliedes 4.In both cases, the operator must first check the supply belt 3 (arrow II). If the unevenness is greater than normal, the operation of the upstream machine must be checked. If, on the other hand, the unevenness of the original material is normal, there is suspicion of malfunction of the controller 10 or the measuring element 4.

Es besteht auch die nicht näher dargestellte Möglichkeit, die Ausführungsformen nach Figur 1 und 2 sinngemäß zu kombinieren und die Verfahren gleichzeitig durchzuführen.There is also the possibility, not shown in any more detail, of combining the embodiments according to FIGS. 1 and 2 analogously and of carrying out the methods simultaneously.

Bei der in Fig. 1 dargestellten Ausführungsform besteht darüberhinaus die Möglichkeit, analog der Ausführungsform nach Fig. 2 zwei Einstellvorrichtungen 13′ und 13˝ für zwei unterschiedliche Grenzwerte einzusetzen.In the embodiment shown in Fig. 1 there is also the possibility, analogous to the embodiment of FIG. 2, to use two setting devices 13 'and 13˝ for two different limit values.

Umgekehrt kann die Ausführungsform nach Fig. 2 dadurch vereinfacht werden, daß nur eine Einstellvorrichtung 13 analog der Ausführungsform nach Fig. 1 eingesetzt wird.Conversely, the embodiment according to FIG. 2 can be simplified in that only one adjusting device 13 analogous to the embodiment according to FIG. 1 is used.

Insgesamt wird durch die Erfindung bewirkt, daß die Arbeitsweise der Reguliersysteme auf einfache Weise eine Überwachung erfährt, wobei Fehlfunktionen rechtzeitig erkannt und damit die Herstellung fehlerhafter Produkte wirksam vermieden werden.Overall, the invention has the effect that the mode of operation of the regulating systems is monitored in a simple manner, malfunctions being recognized in good time and thus the manufacture of defective products being effectively avoided.

Claims (7)

1. A method of monitoring the levelling of at least one sliver in a controlled drafting arrangement in particular in a drafting frame, in which respect deviations of the composition of the fibre union from the desired value are detected by at least one measuring member and are compensated for by way of a regulator and at least one adjusting member, characterised in that the measured values of the measuring member (4, 5) and/or the adjusting signals of the regulator (10) are compared with at least one adjustable limiting value and a display (14) and/or switching procedure is triggered when the limiting value is exceeded.
2. A method according to claim 1, characterised by comparison of the adjusting signals of the regulating device with the respective adjustable limiting value.
3. A method according to claim 1, characterised by comparison of the measured values of a measuring member (5) subordinated to the controlled drafting frame with the respective adjustable limiting value.
4. A method according to claim 2 or 3, characterised in that one limiting value is closer to the working range of the regulator (10) or respectively of the measuring member (4, 5), and one limiting value is further from the working range of the regulator (10) or respectively of the measuring member (4, 5).
5. A device for carrying out the method according to one of the preceding claims, characterised in that the output of the regulator (10) is connected by way of an ACTUAL/DESIRED point of comparison (12) to at least one limiting value transmitter (13; 13′; 13˝) and to a display device (14) and/or to an adjusting switch (11).
6. A device for carrying out the method according to one of claims 1 to 4, characterised in that the output of a measuring member (5) subordinated to the controlled drafting frame is connected by way of an ACTUAL/DESIRED point of comparison (12) to at least one limiting value transmitter (13) and to a display device (14) and/or to an adjusting switch (11).
7. A device according to claims 5 or 6, characterised in that the limiting value transmitter (13′; 13˝) is designed for the specification of two mutually independently adjustable limited values, of which one limiting value lying closer to the working range of the regulator (10) or respectively of the measuring member (4, 5) is provided for the activating of a display device (14) and one limiting value lying further from the working range of the regulator (10) is provided for the activating of an adjusting switch (11).
EP89108023A 1988-05-04 1989-05-03 Method and device for monitoring the levelling of at least one sliver in a controlled drafting arrangement Revoked EP0340756B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3815200A DE3815200C2 (en) 1988-05-04 1988-05-04 Method and device for monitoring the uniformity of at least one fiber structure in a regulating drafting device
DE3815200 1988-05-04

Publications (2)

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EP0340756A1 EP0340756A1 (en) 1989-11-08
EP0340756B1 true EP0340756B1 (en) 1991-12-04

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EP89108023A Revoked EP0340756B1 (en) 1988-05-04 1989-05-03 Method and device for monitoring the levelling of at least one sliver in a controlled drafting arrangement

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EP (1) EP0340756B1 (en)
DE (2) DE3815200C2 (en)

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US5509179A (en) * 1990-06-25 1996-04-23 Mondini; Giancarlo Autoleveller draw frame having process feed back control system
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DE4219777A1 (en) * 1992-06-17 1993-12-23 Rieter Ingolstadt Spinnerei Method and device for signal analysis of a regulating system
DE19537345C2 (en) * 1994-11-25 2000-05-25 Rieter Ag Maschf Method for controlling a spinning machine and associated spinning machine
ATE284987T1 (en) 2000-11-08 2005-01-15 Rieter Ag Maschf CONTROL OF SPINNING UNITS IN A SPINNING MACHINE

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US7103440B2 (en) 2001-12-11 2006-09-05 Rieter Ingolstadt Spinnereimaschinenbau Ag Use of microwaves for sensors in the spinning industry

Also Published As

Publication number Publication date
DE3815200C2 (en) 1998-01-29
EP0340756A1 (en) 1989-11-08
DE58900523D1 (en) 1992-01-16
DE3815200A1 (en) 1989-11-16

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