EP0331039B1 - Device for detecting neps in carded fibrous textile material - Google Patents
Device for detecting neps in carded fibrous textile material Download PDFInfo
- Publication number
- EP0331039B1 EP0331039B1 EP89103275A EP89103275A EP0331039B1 EP 0331039 B1 EP0331039 B1 EP 0331039B1 EP 89103275 A EP89103275 A EP 89103275A EP 89103275 A EP89103275 A EP 89103275A EP 0331039 B1 EP0331039 B1 EP 0331039B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- carding
- carding device
- photo detector
- illuminating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims description 5
- 239000004753 textile Substances 0.000 title description 2
- 238000009960 carding Methods 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 7
- 238000011156 evaluation Methods 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 4
- 238000011109 contamination Methods 0.000 claims description 2
- 238000005286 illumination Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 11
- 239000004745 nonwoven fabric Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
- D01G31/003—Detection and removal of impurities
Definitions
- the invention relates to a carding device with a device for detecting nits in a carded, textile nonwoven flow.
- the card sliver also contains so-called nits. These are fiber entanglements and knots of different sizes. The causes of their emergence are diverse. They can lie in the raw material, in the pretreatment of the same in the so-called Vortechnik and also in an unsuitable, defective or worn card clothing. Monitoring the frequency of the nits in the card sliver thus allows conclusions to be drawn about the condition of the elements mentioned and the elimination of the corresponding error source. In particular, the wear of the card clothing and the time of regrinding or changing it can be determined.
- the number of nits was determined so that a piece of card sliver was removed and pulled apart in a drafting system. Afterwards, using a lighting device and a magnifying glass, the nits or impurities that appeared as dark spots could be counted visually or manually.
- the measuring device is arranged on a carding device, specifically before the nonwoven is combined into a band, ie in a state of relatively low fiber density. In this state, it is surprisingly possible to detect nits and other errors due to changes in the brightness of the image during the movement of the nonwoven fabric flow by imaging the illuminated area on a light-sensitive arrangement.
- the light-sensitive arrangement is advantageously composed of a plurality of sensors arranged in rows, an area area of the material flow which is of the order of magnitude of a nit, i.e. e.g. is at most ten times its extent.
- the signals from each sensor are then separately detected for changes in brightness or level.
- the detection device is based on the fact that a nit has far more fibers per square millimeter than the fleece. Nits are very small fiber accumulations with a typical diameter of approx. 0.5 mm and a length of approx. 1 mm. If the nonwoven fabric is illuminated with incident light, more light is reflected in the area of a nit due to the greater fiber density than in the other areas of the nonwoven fabric. In the imaging of an illuminated area on a sensor, this manifests itself in a change in brightness. In order for these changes in brightness to emerge from the "noise" caused by the statistical changes in the fleece density, the surface area of the material flow imaged on a sensor must be selected in the order of magnitude of the nep extent. The optimal size results from the chosen optical imaging scale on the one hand and from cost considerations on the other. Individual elements, arrays or fully integrated photosensor cells can be used.
- the nonwoven fabric 1 shows the device for detecting nits on a carding device.
- the nonwoven fabric 1 passes through a licker-in 2 onto a reel 3 of a card and is then taken over by a take-off roller 4.
- the nit detection on the take-off roll takes place in the example shown.
- the nit detection device 10 is preferably arranged in such a way that the light exit and entry windows are inclined approximately vertically or forwards so that no dust deposits form on it.
- the optimum mounting location is often the output side of the take-off roller 4.
- the nit detection device 10 is connected to a display or output device 11, on which the result of the detection can be determined from the outside.
- FIG. 2 shows part of the take-off roller 4 together with a schematic view of the detection device 10 for a sensor.
- the fiber fleece 1 is illuminated by means of a light source 12, which can be designed as a light bulb or as an LED element, via a converging lens and a gap 14 with a transparent cover.
- the direction of illumination is at an angle of approximately 45 ° to the tangent of the take-off roller 4, while the direction of observation is approximately perpendicular to it. This ensures that reflections from the polished front sides of the teeth 15 of the take-off roller 4 do not falsify the measurement result.
- the illuminated surface area on the fleece 1 is imaged by means of optics 16 on a photosensor 17, which is shown in FIG. 2 only as a circuit symbol.
- the photosensor 17 is e.g. a preferably integrated photodiode with a certain surface area is suitable.
- the surface area is 1 mm in the direction of the fiber fleece and 2.5 mm transversely thereto.
- it can also be reduced further.
- Several such photo sensors 17 can be arranged in arrays or in a fully integrated arrangement in rows 18 next to one another in groups 18. 4 shows such a row-like sensor group 18 with ten sensors 17 arranged next to one another, each with a width b of 2.5 mm, which thus scan a strip of width B of 2.5 cm.
- Each of the sensors 17 is connected to its own evaluation circuit, which is shown schematically in FIG. 2.
- the photosensor 17 is connected to a voltage source 19 and a limiting resistor R.
- the current level in this circuit is fed to a discriminator 21 via a current measuring circuit 20. If the measured current level exceeds a set threshold, the discriminator generates an output signal which is added in a counter 22.
- the evaluation of the signals from the photo sensors is improved if the light intensity, but rather its differential quotient is used as the criterion in the discriminator 21. Due to the movement of the fleece transversely to the sensor line 18, each nit generates an increase followed by a decrease in the photocurrent. With suitable dimensions, double differentiation also provides favorable values. If it is to be avoided that foreign bodies, for example plant particles, are also detected in addition to the nits, counter 22 can be used an electronic time measurement circuit can be provided, so that the counter only responds if there is a drop after a current rise within a period corresponding to the maximum nep size.
- circuits for evaluating the signals from the photosensors are required for each sensor 17, which in itself results in considerable effort. Since these are always the same elements and only 2 connections are required per unit, these circuits can therefore be built as an integrated circuit, possibly in a housing with the sensor.
- a rapid multiplex circuit is provided in another embodiment, not shown in the drawing, by means of which the signals from the sensors are sampled sequentially. If the sampling clock is in the megahertz range, as is the case today with known CCD components, there is sufficient time resolution for the detection of the nits. The sequential signals obtained in this way can thus be evaluated in a single evaluation circuit.
- a further simplification of the device is achieved in that the full width of the fleece is not optically scanned. This is shown in FIG. 3 by means of a supervision of the take-off roller 4.
- the detection device 10 in this case has a number of sensor groups 18 distributed over the roll width 4, which detect tracks 25 of approximately 2.5 cm in width on the fleece. This allows the quality of the carding to be assessed across the entire width of the fleece. If local clothing damage between these tracks is also to be recorded, a slow transverse movement of the detection device 10 by one track distance can be provided are, as indicated by the arrows 26. The determination of the number of nits is then correlated with this movement.
- By taking the cycle time of the clothing into account by means of the time measurement circuit mentioned foreign objects, for example wood particles, which are jammed in it can also be detected in this way.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Treatment Of Fiber Materials (AREA)
Description
Die Erfindung betrifft eine Kardiereinrichtung mit einer Vorrichtung zum Detektieren von Nissen in einem kardierten, textilen Faservliesstrom. Im Kardenband findet man neben Verunreinigungen durch Fremdkörper auch sog. Nissen. Dies sind Faserverschlingungen und -verknotungen unterschiedlicher Grösse. Die Ursachen ihrer Entstehung sind vielfältig. Sie können im Rohmaterial, in der Vorbehandlung desselben im sog. Vorwerk und auch in einer ungeeigneten, defekten oder abgenutzten Garnitur der Karde liegen. Eine Ueberwachung der Häufigkeit der Nissen im Kardenband erlaubt damit Rückschlüsse auf den Zustand der erwähnten Elemente und die Ausschaltung der entsprechenden Fehlerquelle. Insbesondere kann die Abnutzung der Kardengarnitur und der Zeitpunkt des Nachschleifens bzw. Auswechselns derselben bestimmt werden.The invention relates to a carding device with a device for detecting nits in a carded, textile nonwoven flow. In addition to contamination from foreign bodies, the card sliver also contains so-called nits. These are fiber entanglements and knots of different sizes. The causes of their emergence are diverse. They can lie in the raw material, in the pretreatment of the same in the so-called Vorwerk and also in an unsuitable, defective or worn card clothing. Monitoring the frequency of the nits in the card sliver thus allows conclusions to be drawn about the condition of the elements mentioned and the elimination of the corresponding error source. In particular, the wear of the card clothing and the time of regrinding or changing it can be determined.
Bisher wurde die Nissenzahl so bestimmt, dass ein Stück Kardenband entnommen und in einem Streckwerk auseinandergezogen wurde. Danach konnten mittels einer Beleuchtungseinrichtung und einer Lupe die in der Durchsicht als dunkle Stellen erscheinenden Nissen bzw. Verunreinigungen visuell bzw. manuell gezählt werden.Previously, the number of nits was determined so that a piece of card sliver was removed and pulled apart in a drafting system. Afterwards, using a lighting device and a magnifying glass, the nits or impurities that appeared as dark spots could be counted visually or manually.
Dieses Vorgehen weist den Nachteil auf, dass ein Stück Kardenband entnommen werden muss, um die erwähnte Analyse vorzunehmen. Sie kann aus diesem Grund auch nicht kontinuierlich vorgenommen werden, sondern bei vertretbarem Personalaufwand nur in zeitlichen Abständen. Die Beurteilung der Proben unterliegt beim erläuterten Vorgehen ferner einem gewissen Ermessen der Beurteilungsperson, so dass ein allgemein gültiger Beurteilungsmassstab nicht besteht.This procedure has the disadvantage that a piece of card sliver has to be removed in order to carry out the aforementioned analysis. For this reason, it cannot be carried out continuously, but only at regular intervals with reasonable personnel expenditure. The assessment of the samples is also subject to a certain discretion of the assessor in the procedure explained, so that there is no generally applicable assessment standard.
In GB 1 411 254, GB-A 2 095 828, DE-A 1 473 726, US-4 075 498 und GB 1 211 463 werden automatische Nissendetektoren beschrieben, bei welchen der Faserstrom ausgebreitet und ausgedünnt durch einen speziellen Messbereich geführt wird, wo mit optischen Mitteln Unregelmässigkeiten detektiert werden können. Diese Lösungen sind aber relativ aufwendig, da sie eine Aufbereitung des Faserstroms benötigen. Auch kann insbesondere das Ausdünnen und Aufweiten zu Defekten führen.In GB 1 411 254, GB-A 2 095 828, DE-A 1 473 726, US-4 075 498 and GB 1 211 463 automatic nit detectors are described, in which the fiber stream is spread and thinned through a special measuring range, where Irregularities can be detected with optical means. However, these solutions are relatively complex since they require processing of the fiber stream. In particular, thinning and widening can lead to defects.
Es stellt sich damit die Aufgabe, eine Vorrichtung der eingangs genannten Art zu schaffen, welche diese Nachteile nicht aufweist und es erlaubt, die Nissen im Kardenband permanent zu überwachen, ohne dass dazu ein Stück Band entnommen werden muss, ohne den Einsatz einer zusätzlichen Person und ohne dass eine aufwendige Aufbereitung des Faserstroms nötig wäre.It is therefore the task of creating a device of the type mentioned at the outset which does not have these disadvantages and which allows the nits in the card sliver to be monitored continuously without a piece of tape having to be removed, without the use of an additional person and without the need for complex processing of the fiber stream.
Die Lösung dieser Aufgabe ergibt sich durch die Vorrichtung gemäss dem ersten Patentanspruch. Die Messvorrichtung wird an einer Kardiereinrichtung angeordnet und zwar vor der Zusammenfassung des Faservlieses zu einem Band, d.h. in einem Zustand relativ geringer Faserdichte. In diesem Zustand gelingt es überraschenderweise, mittels Abbildung des beleuchteten Flächenbereichs auf eine lichtempfindliche Anordnung, Nissen sowie andere Fehler durch die Helligkeitsänderungen des Bildes bei der Bewegung des Faservliesstroms zu detektieren.This object is achieved by the device according to the first claim. The measuring device is arranged on a carding device, specifically before the nonwoven is combined into a band, ie in a state of relatively low fiber density. In this state, it is surprisingly possible to detect nits and other errors due to changes in the brightness of the image during the movement of the nonwoven fabric flow by imaging the illuminated area on a light-sensitive arrangement.
Um eine gute Detektion zu ermöglichen, ist die lichtempfindliche Anordnung mit Vorteil aus mehreren zeilenartig angeordneten Sensoren zusammengesetzt, wobei auf jedem Sensor ein Flächenbereich des Materialstroms abgebildet wird, der von der Grössenordnung einer Nisse, d.h. z.B. höchstens das Zehnfache ihrer Ausdehnung ist. Die Signale jedes Sensors werden dann separat auf Helligkeits- bzw. Pegeländerungen detektiert.In order to enable good detection, the light-sensitive arrangement is advantageously composed of a plurality of sensors arranged in rows, an area area of the material flow which is of the order of magnitude of a nit, i.e. e.g. is at most ten times its extent. The signals from each sensor are then separately detected for changes in brightness or level.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnungen näher erläutrt. Es zeigen darin:
- Fig. 1
- eine Kardiereinrichtung mit der erfindungsgemässen Vorrichtung;
- Fig. 2
- der Aufbau der Vorrichtung im Bereich eines Sensors;
- Fig. 3
- eine Ansicht einer Abnehmerwalze der Kardiereinrichtung mit der Detektionsvorrichtung, und
- Fig. 4
- die Darstellung einer Sensorzeile.
- Fig. 1
- a carding device with the device according to the invention;
- Fig. 2
- the structure of the device in the area of a sensor;
- Fig. 3
- a view of a take-off roller of the carding device with the detection device, and
- Fig. 4
- the representation of a sensor line.
Die Detektionsvorrichtung beruht auf dem Umstand, dass eine Nisse weit mehr Fasern pro Quadratmillimeter aufweist als das Vlies. Nissen sind sehr kleine Faseranhäufungen mit einem typischen Durchmesser von ca. 0,5 mm und einer Länge von ca. 1 mm. Wird das Faservlies mit Auflicht beleuchtet, so wird im Bereich einer Nisse zufolge der grösseren Faserdichte mehr Licht reflektiert als in den übrigen Bereichen des Vlieses. In der Abbildung eines beleuchteten Flächenbereichs auf einen Sensor äussert sich dies in einer Helligkeitsänderung. Damit diese Helligkeitsänderungen aus dem "Rauschen", hervorgerufen durch die statistischen Aenderungen der Vliesdichte, hervortreten, muss der auf einen Sensor abgebildete Flächenbereich des Materialstroms in der Grössenordnung der Nissenausdehnung gewählt werden. Die optimale Grösse ergibt sich aus dem gewählten optischen Abbildungsmassstab einerseits und aus Kostenüberlegungen andererseits. Es können dabei Einzelelemente, Arrays oder vollintegrierte Photosensorzellen verwendet werden.The detection device is based on the fact that a nit has far more fibers per square millimeter than the fleece. Nits are very small fiber accumulations with a typical diameter of approx. 0.5 mm and a length of approx. 1 mm. If the nonwoven fabric is illuminated with incident light, more light is reflected in the area of a nit due to the greater fiber density than in the other areas of the nonwoven fabric. In the imaging of an illuminated area on a sensor, this manifests itself in a change in brightness. In order for these changes in brightness to emerge from the "noise" caused by the statistical changes in the fleece density, the surface area of the material flow imaged on a sensor must be selected in the order of magnitude of the nep extent. The optimal size results from the chosen optical imaging scale on the one hand and from cost considerations on the other. Individual elements, arrays or fully integrated photosensor cells can be used.
In Fig. 1 ist die Vorrichtung zum Detektieren von Nissen an einer Kardiereinrichtung dargestellt. Das Faservlies 1 gelangt über einen Vorreisser 2 auf einen Tambour 3 einer Karde und wird dann von einer Abnehmerwalze 4 übernommen. Bevor das kardierte Faservlies von Abnahmewalzen 5 den Kalandern 6 zur Bildung eines Faserbands zugeführt wird, erfolgt im dargestellten Beispiel die Nissendetektion auf der Abnehmerwalze.1 shows the device for detecting nits on a carding device. The nonwoven fabric 1 passes through a licker-in 2 onto a reel 3 of a card and is then taken over by a take-
Die Nissendetektionsvorrichtung 10 ist vorzugsweise so angeordnet, dass die Lichtaus- und - eintrittsfenster etwa vertikal oder nach vorne geneigt sind, so dass sich darauf keine Staubablagerungen bilden.The
Häufig ist der optimale Anbauort die Ausgangsseite der Abnehmerwalze 4. Die Nissendetektionsvorrichtung 10 ist mit einer Anzeige- bzw. Ausgabevorrichtung 11 verbunden, auf welcher von aussen das Ergebnis der Detektion feststellbar ist.The optimum mounting location is often the output side of the take-
In Fig. 2 ist ein Teil der Abnehmerwalze 4 zusammen mit einer schematischen Ansicht der Detektionsvorrichtung 10 für einen Sensor gezeigt. Mittels einer Lichtquelle 12, welche als Glühbirne oder als LED-Element ausgebildet sein kann, wird das Faservlies 1 über eine Sammellinse und einen Spalt 14 mit transparenter Abdeckung beleuchtet. Die Beleuchtungsrichtung verläuft dabei in einem Winkel von etwa 45° zur Tangente der Abnehmerwalze 4, während die Beobachtungsrichtung etwa senkrecht dazu verläuft. Damit wird sichergestellt, dass nicht Reflexe der blankgeschliffenen Stirnseiten der Zähne 15 der Abnehmerwalze 4 das Messergebnis verfälschen.FIG. 2 shows part of the take-
Der beleuchtete Flächenbereich auf dem Vlies 1 wird mittels einer Optik 16 auf einen Photosensor 17 abgebildet, der in Fig. 2 nur als Schaltungssymbol dargestellt ist. Als Photosensor 17 ist z.B. eine vorzugsweise integrierte Fotodiode mit bestimmter Flächenausdehnung geeignet. Im vorliegenden Ausführungsbeispiel beträgt die Flächenausdehnung 1 mm in Faservlies-Laufrichtung und 2,5 mm quer dazu. Sie kann aber auch weiter verkleinert werden. Mehrere solcher Fotosensoren 17 können in Arrays oder in vollintegrierter Anordnung zeilenartig nebeneinander in Gruppen 18 angeordnet werden. In Fig. 4 ist eine solche zeilenartige Sensorgruppe 18 mit zehn nebeneinander angeordneten Sensoren 17 mit einer Breite b von je 2,5 mm dargestellt, welche damit einem Streifen der Breite B von 2,5 cm abtasten.The illuminated surface area on the fleece 1 is imaged by means of
Jeder der Sensoren 17 ist mit einer eigenen Auswerteschaltung verbunden, die schematisch in Fig. 2 gezeigt ist. Der Fotosensor 17 ist an einer Spannungsquelle 19 und einem Begrenzungswiderstand R angeschlossen. Der Strompegel in diesem Schaltkreis wird über eine Strommessschaltung 20 einem Diskriminator 21 zugeführt. Uebersteigt der gemessene Strompegel eine eingestellte Schwelle, so erzeugt der Diskriminator ein Ausgangssignal, das in einem Zähler 22 addiert wird.Each of the
Die Auswertung der Signale der Fotosensoren wird verbessert, wenn im Diskriminator 21 nicht die Lichtintensität, sondern ihr Differentialquotient als Kriterium verwendet wird. Durch die Bewegung des Vlieses quer zur Sensorzeile 18 erzeugt jede Nisse einen Anstieg gefolgt von einem Abfall des Fotostromes. Bei geeigneter Dimensionierung liefert also auch die zweifache Differentiation günstige Werte. Wenn vermieden werden soll, dass neben den Nissen auch Fremdkörper z.B. Pflanzenteilchen erfasst werden, so kann im Zähler 22 eine elektronische Zeitmessschaltung vorgesehen sein, so dass der Zähler nur anspricht, wenn nach einem Stromanstieg, innerhalb eines der maximalen Nissengrösse entsprechenden Zeitraumes ein -abfall erfolgt.The evaluation of the signals from the photo sensors is improved if the light intensity, but rather its differential quotient is used as the criterion in the
Diese Schaltungen zur Auswertung der Signale der Fotosensoren sind für jeden Sensor 17 erforderlich, was an sich einen erheblichen Aufwand zur Folge hat. Da es sich dabei immer um die gleichen Elemente handelt und je Einheit nur 2 Anschlüsse benötigt werden, können diese Schaltungen deshalb als integrierte Schaltung, gegebenenfalls in einem Gehäuse mit dem Sensor aufgebaut sein.These circuits for evaluating the signals from the photosensors are required for each
Statt jedem Sensor 17 eine eigene Auswerteschaltung beizugeben, ist bei einer anderen, zeichnerisch nicht dargestellten Ausführung eine rasche Multiplexschaltung vorgesehen, mittels welcher die Signale der Sensoren sequentiell abgetastet werden. Liegt der Abtasttakt im Megahertz-Bereich, wie dies heute bei bekannten CCD-Bauelementen der Fall ist, so ist eine ausreichende, zeitliche Auflösung zur Erkennung der Nissen gegeben. Die so gewonnenen, sequenziellen Signale können damit in einer einzigen Auswerteschaltung ausgewertet werden.Instead of adding a separate evaluation circuit to each
Eine weitere Vereinfachung der Vorrichtung wird dadurch erreicht, dass nicht die volle Breite des Vlieses optisch abgetastet wird. In Fig. 3 ist dies anhand einer Aufsicht auf die Abnehmerwalze 4 dargestellt. Die Detektionsvorrichtung 10 weist hierbei einige über die Walzenbreite 4 verteilte Sensorgruppen 18 auf, die auf dem Vlies Spuren 25 von jeweils ca. 2,5 cm Breite erfassen. Damit lässt sich die Qualität der Kardierung über die gesamte Vliesbreite beurteilen. Sollen auch lokale Garniturbeschädigungen zwischen diesen Spuren erfasst werden, kann eine langsame Querbewegung der Detektionsvorrichtung 10 um einen Spurabstand vorgesehen werden, wie mit den Pfeilen 26 angedeutet. Die Bestimmung der Nissenzahlen wird dann mit dieser Bewegung korrelliert. Durch die Berücksichtigung der Umlaufzeit der Garnitur mittels der erwähnten Zeitmessschaltung lassen sich auf diese Weise auch in dieser eingeklemmte Fremdkörper, z.B. Holzteilchen, erfassen.A further simplification of the device is achieved in that the full width of the fleece is not optically scanned. This is shown in FIG. 3 by means of a supervision of the take-off
Claims (10)
- Carding device, in which a fibre web is led over at least one rotating roller (4) of the carding device, characterised in that a device for detecting neps is arranged on the roller (4), which comprises an illuminating device (12-14) illuminating the fibre web on the roller and at least one light measuring device (16) for receiving light reflected from the fibre web, wherein the illuminating device (12-14) is designed for illuminating the fibre web in at least one defined area on the roller (4) with an extension transversely to the direction of rotation, and that the light measuring device (16-18) comprises at least one imaging optics (16), by means of which the illuminated area of the fibre web transported on the roller (4) is projected onto at least one photo detector (17), wherein the photo detector is connected to a processing circuit (20,21,22) for processing the detector signals influenced by the changes of brightness of the projection.
- Carding device according to claim 1, characterised in that the device for detecting neps is arranged on the stripper roller of the carding device.
- Carding device according to one of the preceding claims, characterised in that the illuminating device (12,13,14) has an illumination angle of approximately 45° in respect to the tangent of the roller (4) and the axis of the imaging optics (16) runs approximately perpendicularly to this tangent.
- Carding device according to one of the preceding claims, characterised in that the processing circuit (20,21,22) comprises a time measuring circuit, by means of which the duration of a sensor signal can be determined, such that it is only observed when after a rise of the signal a drop of the signal occurs within a time period corresponding the maximum nep size.
- Carding device according to one of the preceding claims, characterised in that the light measuring device comprises a plurality of photo detectors (17), wherein a given area of the material is projected onto each photo detector, the dimensions of which correspond in their order of magnitude to the nep dimensions.
- Carding device according to one of the preceding claims, characterised in that the light measuring device (18) is built up from photo detectors (17) arranged a row-like manner transversely to the direction of material flow.
- Carding device according to one of the claims 5 or 6, characterised in that each photo detector (17) is provided with its own processing circuit (20,21).
- Carding device according to one of the preceding claims, characterised in that the processing circuit comprises a discriminator circuit (21), by means of which at least one signal level of the photo detector signal or its time derivative can be detected.
- Carding device according to claim 8, characterised in that a time measuring device is further provided for measuring the distance in time of detected events, such that under consideration of the rotation time of the roller erroneous counts due to contamination of the roller fittings can be detected.
- Carding device according to one of the claims 5 or 6, characterised in that the photo detectors are built up as fully integrated photo detector rows, the signals of which are read out sequentially and evaluated in a single evaluation circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH785/88 | 1988-03-02 | ||
| CH785/88A CH669401A5 (en) | 1988-03-02 | 1988-03-02 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0331039A2 EP0331039A2 (en) | 1989-09-06 |
| EP0331039A3 EP0331039A3 (en) | 1991-03-20 |
| EP0331039B1 true EP0331039B1 (en) | 1994-12-14 |
Family
ID=4195131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89103275A Expired - Lifetime EP0331039B1 (en) | 1988-03-02 | 1989-02-24 | Device for detecting neps in carded fibrous textile material |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4953265A (en) |
| EP (1) | EP0331039B1 (en) |
| JP (1) | JPH01272947A (en) |
| CH (1) | CH669401A5 (en) |
| DE (1) | DE58908750D1 (en) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH674378A5 (en) * | 1989-04-18 | 1990-05-31 | Hans Juergen Scheinhuette | |
| US5130559A (en) * | 1989-08-26 | 1992-07-14 | Trutzschler Gmbh & Co. Kg | Method and apparatus for recognizing particle impurities in textile fiber |
| EP0452676B1 (en) * | 1990-03-22 | 1998-12-16 | Maschinenfabrik Rieter Ag | Identification cleaning field |
| US5509179A (en) * | 1990-06-25 | 1996-04-23 | Mondini; Giancarlo | Autoleveller draw frame having process feed back control system |
| EP0481302A3 (en) * | 1990-10-16 | 1992-09-02 | Maschinenfabrik Rieter Ag | Grid for an opening roller of a spinning machine |
| EP0565486B2 (en) † | 1992-04-07 | 2011-07-13 | Maschinenfabrik Rieter Ag | Controlled card-clothing grinding |
| EP0604875B1 (en) * | 1992-12-31 | 1999-04-21 | Zellweger Uster, Inc. | Continious two dimensional monitoring of thin webs of textile materials |
| DE4340173A1 (en) * | 1993-11-25 | 1995-06-01 | Hergeth Hubert A | Detecting and removing alien bodies |
| WO1996011292A2 (en) * | 1994-10-10 | 1996-04-18 | Carding Specialists (Canada) Limited | Card waste monitoring |
| DE19514039B4 (en) * | 1995-04-13 | 2006-01-19 | Trützschler GmbH & Co KG | Device on a spinning preparation machine, z. B. card, carding o. |
| GR960100084A (en) * | 1995-04-13 | 1996-12-31 | Trutzschler Gmbh & Co Kg | Apparatus on a carding machine |
| DE19604499B4 (en) * | 1995-04-13 | 2009-01-08 | TRüTZSCHLER GMBH & CO. KG | Device on a card to detect disturbing particles, especially Trashteilen, Nissen, Schalennissen, nubs u. like. |
| GR960100271A (en) * | 1996-07-31 | 1998-03-31 | Trutzschler Gmbh & Co. Kg | Apparatus on a carding machine. |
| DE19651893B4 (en) * | 1996-12-13 | 2006-10-05 | TRüTZSCHLER GMBH & CO. KG | Method and device on a card for processing textile fibers z. B. cotton, chemical fibers u. like. |
| US5822972A (en) * | 1997-06-30 | 1998-10-20 | Zellweger Uster, Inc. | Air curtain nep separation and detection |
| EP1612302B1 (en) * | 1998-03-30 | 2008-03-05 | Maschinenfabrik Rieter Ag | Carding machine with guided module |
| DE19943079A1 (en) * | 1999-09-09 | 2001-03-15 | Truetzschler Gmbh & Co Kg | Device on a card or card, in which a fibrous web of textile fibers, e.g. Cotton, man-made fibers and the like |
| US6936836B2 (en) | 1999-09-09 | 2005-08-30 | TRüTZSCHLER GMBH & CO. KG | Method and apparatus for examining fiber material traveling in a fiber processing machine |
| DE10057170A1 (en) * | 2000-11-16 | 2002-05-23 | Rieter Ag Maschf | Determination of defects |
| WO2007051335A1 (en) * | 2005-11-04 | 2007-05-10 | Maschinenfabrik Rieter Ag | Method and apparatus for detecting dirt in a moving fibre stream |
| CN108796681A (en) * | 2018-07-20 | 2018-11-13 | 青岛宏大纺织机械有限责任公司 | Fibre defect on-line monitoring system on a kind of carding machine |
| DE102019115138B3 (en) * | 2019-06-05 | 2020-12-10 | TRüTZSCHLER GMBH & CO. KG | Card, fleece guide element, spinning preparation plant and method for detecting interfering particles |
| DE102020110332A1 (en) * | 2020-04-15 | 2021-10-21 | TRüTZSCHLER GMBH & CO. KG | Comber |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3157915A (en) * | 1959-07-09 | 1964-11-24 | Geo W Bollman & Co Inc | Control device |
| FR1333809A (en) * | 1962-05-28 | 1963-08-02 | Detaching device and sail purifier for carding machine | |
| DE1473726A1 (en) * | 1965-05-22 | 1969-07-10 | Forschungsinst Fuer Textilindu | Device for testing nits |
| US3480786A (en) * | 1966-01-13 | 1969-11-25 | Gaf Corp | Flaw detecting system including synchronously rotating optic fiber tubes |
| BE704412A (en) * | 1967-09-28 | 1968-02-01 | ||
| US3562866A (en) * | 1968-10-23 | 1971-02-16 | Crompton & Knowles Corp | Density control for a textile lap former |
| US3652864A (en) * | 1970-09-29 | 1972-03-28 | W E Dunn Mfg Co | Measuring length of wire fabric by counting only strands normal to direction of motion |
| GB1411254A (en) * | 1972-02-14 | 1975-10-22 | Hassan M A | Nep counter |
| JPS51113783A (en) * | 1975-03-31 | 1976-10-07 | Asahi Chem Ind Co Ltd | Defects detector of nonwoven fabric |
| CA1082811A (en) * | 1976-04-05 | 1980-07-29 | Greenwood Mills, Inc. | Diffraction pattern amplitude analysis for use in fabric inspection |
| NL7712315A (en) * | 1977-11-09 | 1979-05-11 | Philips Nv | METHOD FOR EPITAXIAL DEPOSITION OF SEVERAL LAYERS. |
| CH627497A5 (en) * | 1978-04-26 | 1982-01-15 | Zellweger Uster Ag | DEVICE FOR OBTAINING ONE OF THE REGULATORY SIGNALS RELATING TO THE DENSITY OF THE FIBER COATING ON THE TAMBOUR OF A CARD. |
| GB2095828B (en) * | 1981-03-31 | 1985-12-18 | Wool Dev Int | Detection of defects in fibrous arrays |
| US4481667A (en) * | 1981-12-21 | 1984-11-06 | Autronics Corporation | Item counting apparatus |
| CH660920A5 (en) * | 1983-02-03 | 1987-05-29 | Zellweger Uster Ag | METHOD AND DEVICE FOR THE AUTOMATIC DETECTION OF FAULTS IN TISSUES AND SIMILAR TEXTILES. |
| CH663474A5 (en) * | 1984-04-24 | 1987-12-15 | Zellweger Uster Ag | METHOD AND DEVICE FOR THE AUTOMATIC MONITORING OF TISSUE LINES. |
| GB8501910D0 (en) * | 1985-01-25 | 1985-02-27 | Haigh Chadwick Ltd | Web monitoring arrangement |
| DE3703449C2 (en) * | 1987-02-05 | 1998-07-23 | Truetzschler Gmbh & Co Kg | Device for determining foreign bodies, such as metal parts, wires or the like, within or between textile fiber flakes |
| DE19706899C1 (en) * | 1997-02-21 | 1998-11-05 | Bayer Ag | Inorganic, compacted pigment granules, process for their preparation and their use |
-
1988
- 1988-03-02 CH CH785/88A patent/CH669401A5/de not_active IP Right Cessation
-
1989
- 1989-02-24 EP EP89103275A patent/EP0331039B1/en not_active Expired - Lifetime
- 1989-02-24 DE DE58908750T patent/DE58908750D1/en not_active Expired - Fee Related
- 1989-03-01 US US07/317,299 patent/US4953265A/en not_active Expired - Fee Related
- 1989-03-02 JP JP1050954A patent/JPH01272947A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE58908750D1 (en) | 1995-01-26 |
| CH669401A5 (en) | 1989-03-15 |
| JPH01272947A (en) | 1989-10-31 |
| EP0331039A3 (en) | 1991-03-20 |
| EP0331039A2 (en) | 1989-09-06 |
| US4953265A (en) | 1990-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0331039B1 (en) | Device for detecting neps in carded fibrous textile material | |
| DE69324557T2 (en) | Continuous two-dimensional monitoring of thin tissue of textile material | |
| EP0643294B1 (en) | Method and device for the detection of foreign matter in textile materials | |
| EP0584321B1 (en) | Process and device for detecting impurities in a textile test sample | |
| EP0572592B1 (en) | Detection of foreign fibres in yarns | |
| DE19519861C2 (en) | Method and device for detecting and removing foreign objects | |
| DE69819302T3 (en) | DETECTOR AND DETECTION PROCEDURE FOR FOREIGN FIBERS AND FOREIGN MATERIALS BASED ON LIGHT ABSORPTION MEASUREMENT | |
| DE112005002815T5 (en) | Automatic differentiation system and automatic discrimination method | |
| CH643060A5 (en) | METHOD FOR DETERMINING THE DIAMETER OR THE SECTION OF A THREAD OR WIRE-SHAPED BODY, DEVICE FOR IMPLEMENTING THE METHOD, AND APPLICATION OF THE METHOD. | |
| EP0553446B2 (en) | Method for detecting impurities, especially foreign fibres in elongated textile articles | |
| EP0052813A2 (en) | Method for the examination of a moving reflecting or transparent sheet, and device for carrying out said method | |
| EP0226843A2 (en) | Device for measuring the hairiness of a yarn | |
| DE10233011B4 (en) | Device on a spinning machine for the detection and assessment of textile fiber material | |
| DE3446355A1 (en) | OPTICAL TROUBLESHOOTING DEVICE | |
| CH697063A5 (en) | Apparatus at a spinning preparation machine, such as cleaners, NC or carding machine, for recording of fibrous material, eg., Cotton, excreted, from foreign substances and good fibers b | |
| DE112004000873T5 (en) | Automatic discrimination system | |
| DE1798349A1 (en) | Method, device and device for finding and classifying defects in a band or veil of textile fibers | |
| DE102019115138B3 (en) | Card, fleece guide element, spinning preparation plant and method for detecting interfering particles | |
| DE69819034T2 (en) | ONGOING RIBBON MONITORING | |
| EP0884408B1 (en) | Procedure and device for detecting impurities and foreign fibres in a fibre band | |
| EP2656326A1 (en) | Soiling check of the window of a measuring device for checking sheet material | |
| DE19943079A1 (en) | Device on a card or card, in which a fibrous web of textile fibers, e.g. Cotton, man-made fibers and the like | |
| EP0052812A2 (en) | Method for the detection of defect signals using an integrating differential amplifier | |
| EP1207388A1 (en) | Determination of defects | |
| DE69522081T2 (en) | Device for quality and continuity control of a strip applied to a surface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE GB IT |
|
| ITCL | It: translation for ep claims filed |
Representative=s name: ING. C. GREGORJ S.P.A. |
|
| GBC | Gb: translation of claims filed (gb section 78(7)/1977) | ||
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE GB IT |
|
| RHK1 | Main classification (correction) |
Ipc: D01G 31/00 |
|
| 17P | Request for examination filed |
Effective date: 19910817 |
|
| 17Q | First examination report despatched |
Effective date: 19930817 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE GB IT |
|
| ITF | It: translation for a ep patent filed | ||
| REF | Corresponds to: |
Ref document number: 58908750 Country of ref document: DE Date of ref document: 19950126 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19950130 |
|
| ITPR | It: changes in ownership of a european patent |
Owner name: CAMBIO RAGIONE SOCIALE;USTIKO AG |
|
| ITPR | It: changes in ownership of a european patent |
Owner name: CESSIONE;HERMANN SPINNER DR. |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19960424 Year of fee payment: 8 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19960429 Year of fee payment: 8 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19970224 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19970224 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19971101 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050224 |