WO2001007352A1 - Device for observing and controlling one or more textile yarns by a succession of numerical photographs - Google Patents

Device for observing and controlling one or more textile yarns by a succession of numerical photographs Download PDF

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Publication number
WO2001007352A1
WO2001007352A1 PCT/EP2000/007009 EP0007009W WO0107352A1 WO 2001007352 A1 WO2001007352 A1 WO 2001007352A1 EP 0007009 W EP0007009 W EP 0007009W WO 0107352 A1 WO0107352 A1 WO 0107352A1
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WO
WIPO (PCT)
Prior art keywords
numerical
yarns
camera
yarn
microprocessor
Prior art date
Application number
PCT/EP2000/007009
Other languages
French (fr)
Inventor
Regis Munoz
Original Assignee
Regis Munoz
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 Regis Munoz filed Critical Regis Munoz
Priority to AU24823/01A priority Critical patent/AU2482301A/en
Priority to EP00982721A priority patent/EP1212255A1/en
Publication of WO2001007352A1 publication Critical patent/WO2001007352A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/08—Design features of general application for actuating the drive
    • G06M1/10—Design features of general application for actuating the drive by electric or magnetic means
    • G06M1/101—Design features of general application for actuating the drive by electric or magnetic means by electro-optical means
    • 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
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
    • B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
    • 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
    • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • B65H63/062—Electronic slub detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/365—Filiform textiles, e.g. yarns
    • 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 present invention allows to serve and to check, like with the human eye, one or more textile yarns in real time mode, on the basis of successions of numerical photographs taken by a camera and processed by a microprocessor
  • the microprocessor By means of an internal analysis by the microprocessor comprised in the device, it allows i a to recognize the form and the colour of a yam or yarns, as well as to identify the number of yarns present or passing in front of the field of vision of the camera in the device
  • devices for the detection of yarns are commonly mechanical, electrical or optical devices working with visible or infrared light These types of devices gain information about "all or nothing” (presence or absence of an object) and do not either allow the detection of several yarns at the same time at one single detection device
  • the device according to this invention results in an automatic instrument or apparatus allowing to observe and to check in real time mode one or more yarns at the same time
  • the device according to the invention is primarily characterized in that it comprises a numerical camera associated with an image processing microprocessor It is thereby able i a to detect the presence or absence of one or a plurality of yarns and to determine for each yarn in said plurality its movement, as well as its form, cross-section and/or colour
  • the device according to the invention compasses at least
  • a numerical camera of a type of CCD or CDD an image processing microprocessor a communication microprocessor, a continuous and regulated power supply
  • the numerical camera successively and permanently takes very high-speed photographs of the yarn or yarns present or moving in front of its field of vision. Said photographs are then processed by a microprocessor which determines in a logical way i.a. the presence of the yam or yarns, as well as various information about it or them, such as the form, cross-section, movement, if any, and colour or colours.
  • the device according to the invention allows the observation, in real-time, of one or several yarns found in the field of vision of the numerical camera. Thanks to its microprocessor the device can store, check and follow the yarn or yarns in real-time mode.
  • An advantage of this invention resulting from the use of a numerical camera is that this camera allows it to see, like with the human eye, what is found within its field of vision.
  • each photograph taken by the numerical camera is transformed into a binary image.
  • This image (N) is stored and then compared to a stored earlier image (N - 1) with respect to various information such as the number of yarns that are present, their form, thickness (yam count or titre), colour, etc.
  • the same microprocessor can determine the number of yarns present in front of the camera and for each one of them find out the movement resp. non-movement, the speed, the form, the thickness, colour, etc.
  • Said invention is able to determine:
  • Said invention can also determine the colour of the yarn or yams found in front of the field of vision of the camera. -> -
  • the device according to the invention is able to give information about the number of yarns present in front of the camera, to find out if they move and in case they do with what speed, as well as to inform about the form of the yarn or yarns and colour or colours.
  • the device according to the invention is able to send out information of a detection of a fault (error).
  • the information of a fault may be used to stop the machine for which the device is provided.
  • one or more yarns is or are not present as expected in front of the numerical camera
  • one or more yarns does or do not move although it or they are supposed to;
  • one or more yams does or do not move with the desired speed:
  • one or more yarns does or do not have the right form but has or have imperfect spots or portions, e.g. so called weak spots (too small thickness), knots, too thick portions, etc.;
  • one or more yarns has or have a colour which differs or differ from a desired colour or colours.
  • the device according to the invention may transmit and receive information to resp. from one or more other information devices or systems (Fig. 4).
  • the device can measure with high precision the respective position of the yarn or yarns present between the numerical camera and the laser beam facing it.
  • two or more numerical cameras may be placed perpendicularly with respect to each other in order to observe the yarn or yarns in more than one dimension.
  • the device according to the invention may also incorporate two numerical cameras as explained above, each associated with a laser emitting a rectilinear beam, the rays of which are completely parallel and directed towards the cameras.
  • the device can recognize even very complex yarn or yarns in which the fibres of filaments e.g. are extremely high-twisted, or intermingled.
  • the device according to the invention can recognize other complex yarn or yarns in which the fibres or filaments have different colour, different thickness or comprise of different material.
  • the device according to the invention is characterized by an illumination source S arranged to face a numerical camera C such that a yarn or yarns F being present in the field of vision SC are observed like with a human eye.
  • the numerical camera C which is illuminated by the light source S observes the yarn or yarns F.
  • a microprocessor P comprised in the device is continuously taking successive photographs of the view seen by the camera C and stores them for further processing and comparing purposes.
  • the light source L may be a laser which illuminates the numerical camera C.
  • the particular property of such a light source L is that the laser generates rectilinear rays which allow to achieve a constant, identical illumination of the entire vision surface of the numerical camera C.
  • the yarn or yarns F which is or are present between the source L and the camera C are then observed and recognized with a very high degree of precision.
  • the numerical camera continuously sees all that is found in its field of vision, the microprocessor takes an image thereof and digitizes said image into a digital or numerical photograph N at a point in time T, which the microprocessor then compares to an earlier taken and stored photograph N - 1. After complex calculations, said comparison allows to determine the number of yarns present, their movements, if any, their displacements, their speed, their quality, i.e. their form, thickness (yarn count or titre), imperfections, their colours, etc.
  • the microprocessor is the heart or rather brain of the device which is able to recognize and analyze the yarn or yarns as well as to determine any faults or deficiencies which may occur.
  • the microprocessor can send a stop signal to a machine served by the detection device but it can also transmit and receive information to resp. from one or several other microprocessor information units. Furthermore, it is possible to observe the photographic numerical image "at distance" by the microprocessor and the numerical camera in order to have all relevant information or parameters of this photograph in real time.
  • the microprocessor takes several hundreds of photographs per second allowing to obtain a living sequence of the yarns on a real time basis.
  • the detection device can be used to collect in real time desired or necessary information about the detected yarn or yarns, such as e.g. their presence, movement, quality, form, structure, imperfections, thickness (yarn count or titre), colour, any fault conditions, etc.
  • the information gained by the observation in the detection device could e.g. be used in any field of yarn processing, e.g. in the weaving or knitting field, more closely for example in, upstream or downstream a yam feeding device supplying yarn to a weaving or knitting machine, e.g.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Quality & Reliability (AREA)
  • Health & Medical Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

A detection device for one or more textile yarns includes at least one numerical electronic camera C having a field of vision SC defining a detection zone and an image processing microprocessor P.

Description

DEVICE FOR OBSERVING AND CONTROLLING ONE OR MORE TEXTILE YARNS BY A SUCCESSION OF NUMERICAL PHOTOGRAPHS
The present invention allows to serve and to check, like with the human eye, one or more textile yarns in real time mode, on the basis of successions of numerical photographs taken by a camera and processed by a microprocessor
By means of an internal analysis by the microprocessor comprised in the device, it allows i a to recognize the form and the colour of a yam or yarns, as well as to identify the number of yarns present or passing in front of the field of vision of the camera in the device
In the prior art, devices for the detection of yarns are commonly mechanical, electrical or optical devices working with visible or infrared light These types of devices gain information about "all or nothing" (presence or absence of an object) and do not either allow the detection of several yarns at the same time at one single detection device
The device according to this invention results in an automatic instrument or apparatus allowing to observe and to check in real time mode one or more yarns at the same time
The device according to the invention is primarily characterized in that it comprises a numerical camera associated with an image processing microprocessor It is thereby able i a to detect the presence or absence of one or a plurality of yarns and to determine for each yarn in said plurality its movement, as well as its form, cross-section and/or colour
The device according to the invention compasses at least
a numerical camera of a type of CCD or CDD, an image processing microprocessor a communication microprocessor, a continuous and regulated power supply The numerical camera successively and permanently takes very high-speed photographs of the yarn or yarns present or moving in front of its field of vision. Said photographs are then processed by a microprocessor which determines in a logical way i.a. the presence of the yam or yarns, as well as various information about it or them, such as the form, cross-section, movement, if any, and colour or colours. The device according to the invention allows the observation, in real-time, of one or several yarns found in the field of vision of the numerical camera. Thanks to its microprocessor the device can store, check and follow the yarn or yarns in real-time mode.
An advantage of this invention resulting from the use of a numerical camera is that this camera allows it to see, like with the human eye, what is found within its field of vision. By means of processing in the microprocessor each photograph taken by the numerical camera is transformed into a binary image. This image (N) is stored and then compared to a stored earlier image (N - 1) with respect to various information such as the number of yarns that are present, their form, thickness (yam count or titre), colour, etc.
Thus, the same microprocessor can determine the number of yarns present in front of the camera and for each one of them find out the movement resp. non-movement, the speed, the form, the thickness, colour, etc.
Said invention is able to determine:
whether one or more yarns is or are present;
whether one or more yarns move or do not move:
whether one or more yarns is or are broken (or is or are missing);
whether one or more yarns have defects, such as weak spots or portions, to small or too big thicknesses, undesired twists or intermingling of several yarns or yarn fibres, etc.
Said invention can also determine the colour of the yarn or yams found in front of the field of vision of the camera. -> -
By means of the numerical processing of the image or images the device according to the invention is able to give information about the number of yarns present in front of the camera, to find out if they move and in case they do with what speed, as well as to inform about the form of the yarn or yarns and colour or colours.
Moreover, the device according to the invention is able to send out information of a detection of a fault (error). The information of a fault may be used to stop the machine for which the device is provided.
In the following cases the information of the detection of a fault is given:
one or more yarns is or are not present as expected in front of the numerical camera;
one or more yarns does or do not move although it or they are supposed to;
one or more yams does or do not move with the desired speed:
one or more yarns does or do not have the right form but has or have imperfect spots or portions, e.g. so called weak spots (too small thickness), knots, too thick portions, etc.;
one or more yarns has or have a colour which differs or differ from a desired colour or colours.
Thanks to a communication processor the device according to the invention may transmit and receive information to resp. from one or more other information devices or systems (Fig. 4).
By employing a laser as light source to emit a rectilinear beam of rays onto the numerical camera the device can measure with high precision the respective position of the yarn or yarns present between the numerical camera and the laser beam facing it. According to the invention two or more numerical cameras may be placed perpendicularly with respect to each other in order to observe the yarn or yarns in more than one dimension.
The device according to the invention may also incorporate two numerical cameras as explained above, each associated with a laser emitting a rectilinear beam, the rays of which are completely parallel and directed towards the cameras.
The device can recognize even very complex yarn or yarns in which the fibres of filaments e.g. are extremely high-twisted, or intermingled.
Also, the device according to the invention can recognize other complex yarn or yarns in which the fibres or filaments have different colour, different thickness or comprise of different material.
According to Fig. 1 of the annexed drawings, the device according to the invention is characterized by an illumination source S arranged to face a numerical camera C such that a yarn or yarns F being present in the field of vision SC are observed like with a human eye.
According to Fig. 2, the numerical camera C which is illuminated by the light source S observes the yarn or yarns F. A microprocessor P comprised in the device is continuously taking successive photographs of the view seen by the camera C and stores them for further processing and comparing purposes.
According to Fig. 3 the light source L may be a laser which illuminates the numerical camera C. The particular property of such a light source L is that the laser generates rectilinear rays which allow to achieve a constant, identical illumination of the entire vision surface of the numerical camera C. The yarn or yarns F which is or are present between the source L and the camera C are then observed and recognized with a very high degree of precision.
This way of combining a laser and a numerical camera allows to derive the form of the yarn or yarns with very high precision but also to accurately measure the distance between them. Calculations of movements of the yarns as well as of the magnitudes of their displacements, if any, can also be determined very easily and reliably.
The numerical camera continuously sees all that is found in its field of vision, the microprocessor takes an image thereof and digitizes said image into a digital or numerical photograph N at a point in time T, which the microprocessor then compares to an earlier taken and stored photograph N - 1. After complex calculations, said comparison allows to determine the number of yarns present, their movements, if any, their displacements, their speed, their quality, i.e. their form, thickness (yarn count or titre), imperfections, their colours, etc.
The microprocessor is the heart or rather brain of the device which is able to recognize and analyze the yarn or yarns as well as to determine any faults or deficiencies which may occur. The microprocessor can send a stop signal to a machine served by the detection device but it can also transmit and receive information to resp. from one or several other microprocessor information units. Furthermore, it is possible to observe the photographic numerical image "at distance" by the microprocessor and the numerical camera in order to have all relevant information or parameters of this photograph in real time. The microprocessor takes several hundreds of photographs per second allowing to obtain a living sequence of the yarns on a real time basis.
To summarize, the detection device according to the invention can be used to collect in real time desired or necessary information about the detected yarn or yarns, such as e.g. their presence, movement, quality, form, structure, imperfections, thickness (yarn count or titre), colour, any fault conditions, etc. The information gained by the observation in the detection device could e.g. be used in any field of yarn processing, e.g. in the weaving or knitting field, more closely for example in, upstream or downstream a yam feeding device supplying yarn to a weaving or knitting machine, e.g. in order to initiate a reaction on occurring faults, like a stop signal to the weaving or knitting machine and/or to the yarn feeding device, or to carry out an adaptive parameter setting of any devices or machines involved in the process of yarn or fabric production, and by means of the detected information to treat the yarn in an optimum way.

Claims

Claims
1. Detection device for one or more textile yarns, characterized by at least one numerical electronic camera (C) having a field of vision (SC) defining a yarn detection zone, and by an image processing microprocessor (P).
2. Device as in claim 1 , characterized in that the numerical camera (C) is a CCD or CDD type camera, preferably a high speed type of such camera.
3. Device as in claim 1 , characterized in that it includes a communication microprocessor (P), preferably for uni-directional or bi-directional communication with interrelated information units or systems.
4. Device as in claim 1 , characterized in that it is adapted to send out information representing detected yarn faults or detected out of tolerance conditions.
5. Device as in claim 1 , characterized in that at least one illumination source (L) is provided and oriented into the detection zone or towards the vision surface of the numerical camera (C).
6. Device as in claim 5, characterized in that the illumination source (L) is a laser.
7. Device as in claim 1 , characterized in that two or more numerical cameras (C) are arranged at an angle relative to one another, preferably perpendicularly to one another, in order to observe the yarn or yams in the detection zone in more than one dimension.
8. Device as in claim 1 , characterized in that the numerical camera (C) and its microprocessor (P) are arranged to continuously take and store successive photographs of the view of the detection zone.
9. Device as in claim 1 , characterized in that the microprocessor (P) is designed to take an image seen by the numerical camera (C) and to digitize said image into a photograph (N) at a point in time and to compare photograph (N) to at least one further earlier taken and stored photograph (N - 1 ) by a calculation process.
10. Device as in claim 1 , characterized in that the microprocessor (P) is designed to transfer each photograph taken by the numerical camera (C) into a binary image which is stored and compared with at least one other earlier taken and stored binary image by a pre-determined calculation process.
11. Device as in claim 1 , characterized in that the numerical camera (C) and/or microprocessor (P) is/are designed to take high speed photographs, preferably several hundreds per second, in order to create a real-time living sequence of the yarn or yarns found in the detection zone.
12. Device as in claim 10, characterized in that each taken and stored binary image is defined by its information, i.a. about the expected number of yarns, the expected form of the yarns and their look, the expected thickness (yarn count or titre), the expected colour, the expected yarn movement, the expected speed, and the like.
PCT/EP2000/007009 1999-07-21 2000-07-21 Device for observing and controlling one or more textile yarns by a succession of numerical photographs WO2001007352A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU24823/01A AU2482301A (en) 1999-07-21 2000-07-21 Device for observing and controlling one or more textile yarns by a succession of numerical photographs
EP00982721A EP1212255A1 (en) 1999-07-21 2000-07-21 Device for observing and controlling one or more textile yarns by a succession of numerical photographs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9902753A SE9902753D0 (en) 1999-07-21 1999-07-21 Device for observing and controlling or more textile yarns by a succession of numerical photographs
SE9902753-4 1999-07-21

Publications (1)

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EP (1) EP1212255A1 (en)
AU (1) AU2482301A (en)
SE (1) SE9902753D0 (en)
WO (1) WO2001007352A1 (en)

Cited By (9)

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EP1229323A1 (en) * 2001-02-05 2002-08-07 Rieter CZ a.s. Method of and device for detecting extraneous fibres in a yarn
EP1258832A1 (en) * 2001-05-19 2002-11-20 Schärer Schweiter Mettler AG Device for determining the number of thread turns and its use for monitoring the quality of the textured yarn
WO2003067188A1 (en) * 2002-02-07 2003-08-14 Bfi Vdeh - Institut Für Angewandte Forschung Gmbh Method and device for optically measuring the surface shape and for the optical surface inspection of moving strips in rolling and processing installations
WO2009018910A1 (en) * 2007-08-06 2009-02-12 Memminger-Iro Gmbh Multi-sided thread sensor unit
CN101831758A (en) * 2010-05-20 2010-09-15 常州市第八纺织机械有限公司 Detection device and method of weft breakage of double-axis warp knitting machine
WO2011153650A1 (en) * 2010-06-09 2011-12-15 Uster Technologies Ag Method and apparatus for optoelectronic determination of hairiness length distribution of a yarn
CN103215745A (en) * 2013-04-23 2013-07-24 慈溪太阳洲纺织科技有限公司 Laser broken yarn monitoring device for warp knitting machine
CZ304447B6 (en) * 2013-08-02 2014-05-07 Vysoké Učení Technické V Brně Device to check extruded fiber
CN108689245A (en) * 2017-04-03 2018-10-23 索若德国两合股份有限公司 Manufacture the work station of the weaving loom of cross winding bobbin

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CN103726147B (en) * 2013-12-28 2017-07-28 吴江市振中纺织品有限公司 A kind of electronic yarn clearer
CN104570876B (en) * 2015-01-15 2017-09-22 河南大洋纱线有限公司 A kind of spinning and weaving workshop real-time data acquisition method
GB201601213D0 (en) * 2016-01-22 2016-03-09 Mg Sensors Ltd Yarn imaging device
CN109490303A (en) * 2018-11-27 2019-03-19 福建伟易泰智能科技有限公司 Heald detection and processing method, device and weaving loom

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1229323A1 (en) * 2001-02-05 2002-08-07 Rieter CZ a.s. Method of and device for detecting extraneous fibres in a yarn
EP1258832A1 (en) * 2001-05-19 2002-11-20 Schärer Schweiter Mettler AG Device for determining the number of thread turns and its use for monitoring the quality of the textured yarn
WO2003067188A1 (en) * 2002-02-07 2003-08-14 Bfi Vdeh - Institut Für Angewandte Forschung Gmbh Method and device for optically measuring the surface shape and for the optical surface inspection of moving strips in rolling and processing installations
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WO2009018910A1 (en) * 2007-08-06 2009-02-12 Memminger-Iro Gmbh Multi-sided thread sensor unit
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SE9902753D0 (en) 1999-07-21
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