EP0331039B1 - Dispositif pour la détection de boulochage dans un matériau textile fibreux cardé - Google Patents

Dispositif pour la détection de boulochage dans un matériau textile fibreux cardé Download PDF

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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
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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
Application number
EP89103275A
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German (de)
English (en)
Other versions
EP0331039A2 (fr
EP0331039A3 (fr
Inventor
Hans-Jürgen Scheinhütte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CAMBIO RAGIONE SOCIALE;USTIKO AG
Original Assignee
Loepfe AG Gebrueder
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Publication date
Application filed by Loepfe AG Gebrueder filed Critical Loepfe AG Gebrueder
Publication of EP0331039A2 publication Critical patent/EP0331039A2/fr
Publication of EP0331039A3 publication Critical patent/EP0331039A3/fr
Application granted granted Critical
Publication of EP0331039B1 publication Critical patent/EP0331039B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Claims (10)

  1. Appareil de cardage dans lequel un voile de carde passe sur au moins un cylindre (4) rotatif de l'appareil de cardage, caractérisé en ce qu'un dispositif pour la détection de noeuds est agencé auprès du cylindre (4), ce dispositif comprenant une unité d'éclairage (12 - 14) du voile de carde reposant sur le cylindre, ainsi qu'au moins un ensemble de mesure de luminosité (16) destiné à recevoir de la lumière réfléchie par le voile de carde, l'unité d'éclairage (12 - 14) étant agencée pour éclairer le voile de carde à la surface du cylindre (4) dans au moins une région déterminée ayant une extension perpendiculaire à la direction de la rotation, et en ce que l'ensemble de mesure de la luminosité (16 - 18) comporte au moins un dispositif optique (16) projetant une image de la région illuminée du voile de carde mû par le cylindre (4) sur au moins un photo-récepteur (17) connecté à un circuit de dépouillement (20, 21, 22) pour dépouiller les signaux des récepteurs dus aux changements de luminosité de l'image.
  2. Appareil de cardage selon la revendication 1, caractérisé en ce que le dispositif pour détecter les noeuds est agencé sur le cylindre peigneur de l'appareil de cardage.
  3. Appareil de cardage selon une des revendications précédentes, caractérisé en ce que l'unité d'éclairage (12, 13, 14) présente un angle d'incidence d'environ 45° par rapport à la tangente du cylindre (4) et que l'axe du dispositif optique (16) est sensiblement perpendiculaire à cette tangente.
  4. Appareil de cardage selon une des revendications précédentes, caractérisé en ce que le circuit de dépouillement (20, 21, 22) comporte un circuit de mesure du temps capable de déterminer la durée d'un signal émis par un récepteur de manière à n'en tenir compte que si une montée du signal est suivie d'une chute du signal avant que ne s'écoule un laps de temps correspondant à la taille maximale d'un noeud.
  5. Appareil de cardage selon une des revendications précédentes, caractérisé en ce que l'unité d'éclairage comprend plusieurs photo-récepteurs (17) dont chacun capte l'image d'une région déterminée du matériau en mouvement, cette région ayant environ la taille d'un noeud.
  6. Appareil de cardage selon une des revendications précédentes, caractérisé en ce que l'ensemble (18) de mesure de la luminosité est composé de photo-récepteurs (17) alignés côte à côte, transversalement par rapport au mouvement du matériau.
  7. Appareil de cardage selon une des revendications 5 ou 6, caractérisé en ce que chaque photo-récepteur (17) possède son propre circuit de dépouillement (20, 21).
  8. Appareil de cardage selon une des revendications précédentes, caractérisé en ce que le circuit de dépouillement comporte un circuit discriminateur (21) permettant de détecter au moins une valeur de seuil du signal du photo-récepteur, ou de sa dérivée par rapport au temps.
  9. Appareil de cardage selon la revendication 8, caractérisé en ce qu'il est prévu un circuit de mesure du temps pour mesurer le laps de temps séparant la détection de deux événements, de manière à appréhender, en tenant compte de la vitesse de rotation du cylindre, les erreurs de comptage dues à l'encrassement de la garniture du cylindre.
  10. Appareil de cardage selon une des revendications 5 ou 6, caractérisé en ce que les photo-récepteurs sont réalisés sous forme de rangées de récepteurs totalement intégrés dont les signaux sont lus séquentiellement et dépouillés dans un circuit de dépouillement unique.
EP89103275A 1988-03-02 1989-02-24 Dispositif pour la détection de boulochage dans un matériau textile fibreux cardé Expired - Lifetime EP0331039B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH785/88A CH669401A5 (fr) 1988-03-02 1988-03-02
CH785/88 1988-03-02

Publications (3)

Publication Number Publication Date
EP0331039A2 EP0331039A2 (fr) 1989-09-06
EP0331039A3 EP0331039A3 (fr) 1991-03-20
EP0331039B1 true EP0331039B1 (fr) 1994-12-14

Family

ID=4195131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103275A Expired - Lifetime EP0331039B1 (fr) 1988-03-02 1989-02-24 Dispositif pour la détection de boulochage dans un matériau textile fibreux cardé

Country Status (5)

Country Link
US (1) US4953265A (fr)
EP (1) EP0331039B1 (fr)
JP (1) JPH01272947A (fr)
CH (1) CH669401A5 (fr)
DE (1) DE58908750D1 (fr)

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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 (fr) * 1992-04-07 2011-07-13 Maschinenfabrik Rieter Ag Rectification controlée d'une garniture de carde
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EP0786023B1 (fr) * 1994-10-10 2000-08-23 Carding Specialists (Canada) Limited Systeme de controle de dechets de cardage
GR960100084A (el) * 1995-04-13 1996-12-31 Trutzschler Gmbh & Co Kg Μηχανισμος για ενα λαναρι για τον εντοπισμο οχλουντων σωματιδιων, ιδιαιτερως σωματιδιων προς απορριψη, κομβων, θυλακωτων κομβων, θηλειων και παρομοιων.
DE19604499B4 (de) * 1995-04-13 2009-01-08 TRüTZSCHLER GMBH & CO. KG Vorrichtung an einer Karde zum Erkennen von störenden Partikeln, insbesondere Trashteilen, Nissen, Schalennissen, Noppen u. dgl.
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CN108796681A (zh) * 2018-07-20 2018-11-13 青岛宏大纺织机械有限责任公司 一种梳理机上纤维疵点在线监测系统
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Also Published As

Publication number Publication date
US4953265A (en) 1990-09-04
EP0331039A2 (fr) 1989-09-06
CH669401A5 (fr) 1989-03-15
JPH01272947A (ja) 1989-10-31
DE58908750D1 (de) 1995-01-26
EP0331039A3 (fr) 1991-03-20

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