EP1989139A1 - Procede et dispositif pour classer la qualité d'une bobine de fil - Google Patents

Procede et dispositif pour classer la qualité d'une bobine de fil

Info

Publication number
EP1989139A1
EP1989139A1 EP06723104A EP06723104A EP1989139A1 EP 1989139 A1 EP1989139 A1 EP 1989139A1 EP 06723104 A EP06723104 A EP 06723104A EP 06723104 A EP06723104 A EP 06723104A EP 1989139 A1 EP1989139 A1 EP 1989139A1
Authority
EP
European Patent Office
Prior art keywords
yarn
data values
quality
rewinding
yarn package
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06723104A
Other languages
German (de)
English (en)
Inventor
Marc Schaad
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.)
SSM Schaerer Schweiter Mettler AG
Original Assignee
SSM Schaerer Schweiter Mettler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SSM Schaerer Schweiter Mettler AG filed Critical SSM Schaerer Schweiter Mettler AG
Publication of EP1989139A1 publication Critical patent/EP1989139A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B65H59/385—Regulating winding speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/006—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package quality control of the package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a method and a device for automatic classification of the quality of a yarn package, in particular for detecting mirrors of the yarn package.
  • the inventive method is suitable for use in Umspulvon of yarns, or in an apparatus for performing the Umspulvons (rewinding), with a Umspul nie aus, with the steps of unwinding a yarn from a supply spool and winding the yarn on a rotating with a take-up yarn, wherein the yarn is guided over a yarn path from the supply spool to the yarn carrier.
  • Rewinding of yarns is often done in yarn making.
  • the yarns are to be wound on spools in such a way that the spools in subsequent processes can be used optimally as feed bobbins.
  • the type of winding and its density should be optimized.
  • the yarn to be dyed is rewound or it is a coil is wound with a yarn having a predetermined yarn length, ie a predetermined length of run.
  • the rewinding should be carried out with the highest possible winding speed (rewinding speed).
  • rewinding speed the highest possible winding speed
  • the thread tension variations can easily lead to thread breaks during rewinding.
  • the latter occurs especially in areas of integer turns ratio, i. the ratio of coil revolution to Doppelhubiere, so-called mirror zones or mirrors, the supply spools heaped up. In these areas, the thread layers are close to each other without being fixed by crossing points, which can lead to entrainment of adjacent threads and thus thread tension peaks or thread breaks in the overhead deduction. These thread tension peaks severely limit the rewinding speed.
  • the yarn is withdrawn from the supply spool by the rotating movement of a take-off roll (deduction feed).
  • the take-off roll includes usually a motor-driven main reel and a passive separation reel that sets the geometry of wraps of yarn around the main reel.
  • a "nip-roller" that is to say a further roller. This traps the yarn between the main roll and the other roll, causing the yarn to be pulled off at the tangential speed of the main roll.
  • various biasing systems disposed between the pre-bobbin and a delivery mechanism are known to increase and stabilize the yarn tension of the yarn as it is withdrawn from the supply bobbin.
  • the yarn is often pulled off during rewinding overhead.
  • the feed bobbin does not rotate itself, so working with an immediately usable spare bobbin is possible when pulling off overhead.
  • the invention has for its object to provide a method and apparatus for automatically classifying the quality of a yarn package, which avoid the disadvantages of the prior art and their use in the rewinding of yarns, especially at a high rewinding speed, a load of the thread through the quality determination avoids.
  • the object with regard to the method for the automatic classification of the quality of a yarn package, in particular for detecting mirrors of the yarn package is achieved by means of a computer module having the following method steps:
  • the method can be used as a basis for controlling a rewinding speed when using a computing module operating at a sufficient speed, whereby eg
  • Thread tension sensors are dispensable during rewinding.
  • the method can be implemented inexpensively and simply using commercially available modules as a camera and a computer as a computing module.
  • Method is used as a transformation algorithm, a Fourriertransformation, wherein the data values are calculated as the amplitudes of the thus generated Fourriertransformation in the frequency domain.
  • a Fourier transformation algorithm for example, the known fast Fourier transformation (Fast Fourier Transformation FFT), which is available as a software module in commercially available program libraries, is suitable.
  • the data values can be advantageous before the calculation of the
  • Quality score from the data values by values e.g. weighted by multiplication, with weighting factors, e.g. highlight significant frequency bands for certain quality deficiencies. It can e.g. in the simplest case, only a frequency range corresponding to the low frequencies can be selected. The correspond
  • Weighting factors for selected frequencies 1 and for non-selected 0. If the weighting factors are chosen to be inversely proportional to the frequency values of the associated amplitudes, then the weighting thus made means that lower frequencies are more heavily weighted than high frequencies. So coarse structures in the image of the yarn package are more in the quality index than fine structures.
  • the yarn package is preferably illuminated by means of a light source, wherein the light source is positioned such that the beam direction of the light source forms an acute angle with the longitudinal axis of the yarn package.
  • the quality index can be calculated from the normalized data values.
  • external parameters such as the illumination intensity when the camera images the image of the yarn package, which can influence the calculated data values.
  • the absolute values of the quality characteristics of consecutively recorded images of a yarn package or of different yarn packages are thereby independent of the external parameters.
  • the use of quality codes for controlling, for example, a rewinding speed is thereby possible without adaptation of the control to the external parameters.
  • the quality index can be calculated by summing the data values of one image at a time.
  • An inventive method for rewinding yarns with a rewinding speed has the following method steps:
  • a Umspul yorkskontrolle size of the yarn is determined by the yarn package continuously and regulated the Umspul york of a control module in response to the Umspul yorkskontrolle size.
  • the rewinding speed control variable used is the quality characteristic value calculated by the method according to the invention for the automatic classification of the quality of a yarn package.
  • This rewinding method allows the rewinding speed control to be controlled by the actual reel quality changing during rewinding without additional yarn load to measure the thread tension of the yarn. If the rewinding speed is reduced as the quality index increases and the rewinding speed is increased as the quality index decreases, coarse structures, i. a coarse winding of the yarn on the current bobbin surface reduces the rewinding speed, thereby avoiding yarn tension maxima.
  • An inventive bobbin quality grading device is set up to carry out the method according to the invention for automatically classifying the quality of a yarn bobbin.
  • the Gamspulen2011einstufungsvoroplasty invention has a camera and a
  • the camera is for optically detecting at least one Image of the yarn package
  • the computing module is adapted to convert pixels of a digital version of the image by means of a transformation algorithm into data values and to calculate a quality score from the data values.
  • the yarn package quality grading apparatus of the present invention provides the advantages of the inventive method for automatically grading the quality of a yarn package.
  • a rewinding device according to the invention for rewinding yarns with a rewinding speed is set up for carrying out the rewinding method according to the invention.
  • the rewinding device according to the invention comprises:
  • a supply spool receptacle adapted to receive a yarn package with a yarn to be spooled
  • a yarn carrier receptacle rotatable with a take-up speed, adapted for receiving a yarn carrier on which the yarn can be wound up, wherein the yarn can be guided over a yarn path from the yarn package to the yarn carrier.
  • a yarn package quality grading device according to the invention.
  • the yarn package quality grading device is set up as
  • the rewinding device provides the advantages of the rewinding method according to the invention and can be advantageously used in yarn processing machines.
  • FIG. 1 shows a rewinding device according to the invention.
  • Figures 2a and 2b each show an arrangement of light sources for
  • FIGS. 3a and 3b respectively show an image of a yarn package and a screen photograph of a representation of the data values of the conversion of the yarn package
  • FIGS. 4a and 4b respectively show an image of a yarn package and a yarn package
  • Figures 5a and 5b each show a representation of quality characteristics of 11 bobbins, the quality characteristics in Figure 5a by
  • FIG. 1 shows a rewinding device 1 according to the invention for rewinding yarns.
  • the yarn is unwound from a yarn package 3 used as a supply spool located in a supply spool receptacle 4.
  • a yarn carrier 7, on which the yarn is wound, is in one
  • a rewinding unit 9 designed as a friction roller which is designed as a winding unit for driving the yarn carrier receptacle 8, drives the yarn carrier receptacle 8 such that it rotates at a winding speed.
  • the rewinding unit 9 is an electric motor engaged with the yarn such that it can at least affect the rewinding speed.
  • the yarn is guided while wrapping in a yarn path IO of the supply reel 3 to the yarn carrier 7.
  • a yarn processing module 12 is further arranged. This may be, for example, an oiling device.
  • the yarn bobbin quality grading device continuously determines a quality index, or values of quality codes, as the yarn rewinding speed control.
  • the yarn package quality grading apparatus comprises a light source 20 adapted to illuminate the yarn package 3, and a camera 21 arranged to optically detect at least one image of the yarn package 3.
  • a yarn package quality grading apparatus computing module 25 is for converting pixels of a digital version of the image Determining, from pixels of digital versions of continuously acquired images, by means of a transformation algorithm into data values and to calculate the quality metrics from the data values. The latter is shown in the figure as a flowchart in the stylized representation of the computing module 25. In order to take over the images from the camera 21, the computing module 25 is connected to the camera 21 via a cable.
  • the light source 20 illuminating the yarn package 3 is positioned so that the beam direction 27 of the light source 20 forms an acute angle ⁇ with the longitudinal axis 29 of the yarn package 3 so that bumps, e.g. caused by a poor winding, cast as much shadow on the Garnspulenober Assembly as possible.
  • the illustrated arrangement is particularly suitable for the application of a transformation algorithm in which a conversion of the digital pixels into gray values is carried out, wherein the data values from which the quality index is determined are calculated as the gray values.
  • FIGS. 2a and 2b each show an arrangement of light sources 20 for illuminating a yarn package 3 in an application of the invention Shown method.
  • the camera 21 is in each case with its take-up direction 30 perpendicular to the longitudinal axis 29 of the yarn package 3.
  • the yarn package 3 is arranged in each case an original pair intake 4.
  • two light sources 20 are arranged symmetrically with respect to the receiving direction of the camera 21 at intervals of approximately 30 cm to the yarn package 3, which leads to a uniform illumination of the surface of the yarn package 3.
  • a uniform illumination is advantageous in the case of an application of a Fourier transformation as a transformation algorithm, the data values being calculated as the amplitudes of the Fourration transformation thus produced in the frequency domain.
  • light source 20 is positioned as in Figure 1 such that the beam direction of light source 20 forms an acute angle with the longitudinal axis 29 of yarn package 3 so that bumps, e.g. caused by a poor winding, cast as much shadow on the Garnspulenober Assembly as possible.
  • the arrangement shown in FIG. 2b is particularly suitable for the application of a transformation algorithm in which a conversion of the digital pixels into gray values is carried out.
  • FIGS. 3a and 3b each show an image of a yarn package, image section 7.5 cm by 10 cm, and an illustration of the data values of the conversion of the pixels by means of a Fourier transformation.
  • FIG. 3a an image of the surface of a relatively coarse, ie poor, wound yarn package with pronounced mirror zones is shown.
  • An arrow marked ⁇ is drawn in the image to symbolize that the image can be interpreted as a two-dimensional (2D) representation of waves in space. It can already be seen that the surface structure generated by the coarse winding is repeated with a long wavelength.
  • the lower graph shows a visualization of the amplitude of a discrete 2D Fourier transform of the digitized image in frequency space, i. a representation of the amplitudes of the image underlying
  • Frequencies in a two-dimensional (x- and y-frequency) frequency domain wherein the frequencies are normalized in both coordinate directions each to a maximum value of 100.
  • FIG. 3b shows a representation corresponding to FIG. 3a of an image in the positional space of a uniformly wound yarn package and the discrete 2D Fourier transformation of this image.
  • FIGS. 4a and 4b each show an image of a yarn package and a representation of the data values of the conversion of the associated pixels into gray values.
  • FIG. 4a shows a yarn package with a uniform winding
  • FIG. 4b shows a yarn package with a coarse winding.
  • FIG. 4 a shows a yarn package with a uniform winding
  • FIG. 4 b shows a yarn package with a coarse winding.
  • FIG. 4b in each case to the right of the original images of the yarn packages, substantially more pronounced shadows can be seen in FIG. 4 b than in FIG. 4 a. That is, in FIG. 4b substantially more pixels with high gray values, ie dark pixels, are present than in FIG. 4a.
  • a summation of the gray values therefore leads to a in FIG. 4a lower quality index than in Figure 4b.
  • the quality parameters thus behave here relative to the coil quality as in the case of the described in Figure 3a and 3b Fourriertransformation.
  • FIGS. 5a and 5b each show a representation of quality characteristics of 11 bobbins.
  • the quality indices in FIG. 5a were determined by summing up data values obtained by means of a Fourier transformation
  • the quality indices in FIG. 5b were determined by summing up data values obtained by converting to gray values.
  • the three graphs of FIG. 5a formed by the quality characteristics of the eleven yarn packages were obtained by summing different frequency ranges of the Fourier transformation.
  • the quality indexes of the 11 bobbins were calculated by summing 20 by 20, 15 by 15, and 10 by 10 data values in the lower frequency range, i. in the area of
  • Proposed is a method for automatic classification of the quality of a yarn package 3, in particular for detecting mirrors of the yarn package 3, by means of a computing module 25, with the method steps optical detection at least one image of the yarn package 3 by means of a camera 21, converting pixels of a digital version of the image by means of a transformation algorithm into data values and calculating a quality index from the data values and an apparatus for performing the method.
  • the invention is not limited to the embodiments given above. Rather, a number of variants are conceivable, which make use of the features of the invention even with fundamentally different type of execution.

Abstract

L'invention concerne un procédé pour classer automatiquement la qualité d'une bobine de fil (3), en particulier pour détecter les données de la bobine (3), au moyen d'un module arithmétique (25). Ledit procédé comprend les étapes suivantes: détection optique d'au moins une image de la bobine (3) à l'aide d'une caméra (21); conversion des pixels d'une version numérique de l'image en valeurs de données au moyen d'un algorithme de transformation; et calcul d'un indice de qualité à partir des valeurs de données. L'invention concerne également un dispositif pour mettre en oeuvre le procédé susmentionné.
EP06723104A 2006-02-24 2006-02-24 Procede et dispositif pour classer la qualité d'une bobine de fil Withdrawn EP1989139A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/001721 WO2007098776A1 (fr) 2006-02-24 2006-02-24 Procede et dispositif pour classer la qualité d'une bobine de fil

Publications (1)

Publication Number Publication Date
EP1989139A1 true EP1989139A1 (fr) 2008-11-12

Family

ID=37257408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06723104A Withdrawn EP1989139A1 (fr) 2006-02-24 2006-02-24 Procede et dispositif pour classer la qualité d'une bobine de fil

Country Status (3)

Country Link
EP (1) EP1989139A1 (fr)
CN (1) CN101384500A (fr)
WO (1) WO2007098776A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012103282A1 (de) * 2012-04-16 2013-10-17 Maschinenfabrik Rieter Ag Spulmaschine sowie Verfahren zum Betrieb einer Spulmaschine
DE102013021316A1 (de) * 2013-12-16 2015-06-18 Saurer Germany Gmbh & Co. Kg Verfahren zum Betreiben einer Spulmaschine und Spulmaschine
CN106629248A (zh) * 2016-11-28 2017-05-10 江苏悦达家纺有限公司 基于实时检测的络筒工艺用络卷筒及其检测方法
WO2019170673A1 (fr) * 2018-03-07 2019-09-12 Oerlikon Textile Gmbh & Co. Kg Procédé de contrôle et dispositif de contrôle pour l'analyse d'une bobine de fil enroulée
DE102018131264A1 (de) * 2018-12-07 2020-06-10 Saurer Spinning Solutions Gmbh & Co. Kg Spulmaschine sowie Vorrichtung zur Erkennung von Fadenresten
CN113518753A (zh) * 2019-03-01 2021-10-19 欧瑞康纺织有限及两合公司 用于检查卷绕纱线筒子的方法和装置
CN110550496B (zh) * 2019-07-19 2021-01-12 许昌经纬实业有限公司 一种用于纺织机的进线软夹持装置
DE102021120106B3 (de) 2021-08-03 2022-10-20 Inotec Gmbh Maschinenentwicklung Und Vertrieb Verfahren zum Erkennen des Inhalts einer Fadenspule

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Publication number Priority date Publication date Assignee Title
JPH02265867A (ja) * 1989-04-04 1990-10-30 Murata Mach Ltd パッケージの異常部検出方法
CH686779A5 (de) * 1993-10-29 1996-06-28 Luwa Ag Zellweger Vorrichtung zur Ueberpruefung der Wickelqualitaet von Garnspulen und Verwendung der Vorrichtung an einer Spul- oder Spinnmaschine.
JPH07304567A (ja) * 1994-05-10 1995-11-21 Teijin Ltd パッケージ検査装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007098776A1 *

Also Published As

Publication number Publication date
CN101384500A (zh) 2009-03-11
WO2007098776A1 (fr) 2007-09-07

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