EP1302766A2 - Vorrichtung für die Detektion einer Markierung auf ein Gewebe - Google Patents

Vorrichtung für die Detektion einer Markierung auf ein Gewebe Download PDF

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Publication number
EP1302766A2
EP1302766A2 EP02019978A EP02019978A EP1302766A2 EP 1302766 A2 EP1302766 A2 EP 1302766A2 EP 02019978 A EP02019978 A EP 02019978A EP 02019978 A EP02019978 A EP 02019978A EP 1302766 A2 EP1302766 A2 EP 1302766A2
Authority
EP
European Patent Office
Prior art keywords
fabric
sensor
marking
unit
feed
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Withdrawn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
EP02019978A
Other languages
English (en)
French (fr)
Other versions
EP1302766A3 (de
Inventor
Giovanni Riccardi
Carlo Sarotto
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.)
Bianco SpA
Original Assignee
Bianco SpA
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 Bianco SpA filed Critical Bianco SpA
Publication of EP1302766A2 publication Critical patent/EP1302766A2/de
Publication of EP1302766A3 publication Critical patent/EP1302766A3/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
    • D06H3/00—Inspecting textile materials
    • D06H3/08—Inspecting textile materials by photo-electric or television means

Definitions

  • the present invention relates to a unit for detecting a marking made on a fabric.
  • knitted fabric is normally produced in the form of a tube and is subsequently fed along a feed path to a cutting station for being opened along a marking directrix, which is usually defined as the so-called “needle waste” and must be detected uniquely by a detecting unit set in the cutting station itself.
  • Detecting units of a known type are designed to cooperate with a device for moving the fabric, which displaces the fabric in a direction transverse to the feed path so as to cause the needle waste to collimate continuously with a blade which performs cutting of the fabric itself, and are provided with a linear sensor defined by an array of photodiodes oriented in the direction of the fabric, and with an illuminator of a through type set on the opposite side of the feed path of the fabric with respect to the photodiodes.
  • known detecting units are also provided with an analogue multiplexer for converting the signals from the photodiodes by means of just one 8-bit A-D converter and have a scanning frequency of approximately 11 kHz for a total of one hundred scans of the entire array per second.
  • the detecting units of the type described above present a number of drawbacks due, among other things, also to the low number of sensors and to the simplicity of the detection algorithm, which limit the possibility of their use and their detecting capacity.
  • the low number of sensors from which there derives a very limited resolution, prevents detection of particularly small needle waste or needle waste involving little contrast, and, in addition, in order to obtain a proper contrast it is frequently necessary to stretch the fabric to a greater extent than would be convenient for preventing a degradation of the quality of the fabric itself.
  • the positioning of the sensor and of the illuminator on opposite sides with respect to the feed path causes some types of fabric, which are particularly thick or anyway not permeable to light, not to be detected, since the light information is insufficient for it to reach the sensor.
  • the marking directrix is not indicated by differences of density of the threads in the fabric, but in other ways, such as by folds or lines traced with indelible felt pens or lines of different colour, the difficulty of detection very frequently renders any processing that is not very closely assisted by the operator other than advantageous, so that totally manual processing carried out by the operator is to be preferred.
  • the purpose of the present invention is to provide a unit for detecting a marking on a fabric which will be free from the drawbacks described above.
  • a unit for detecting a marking on a fabric, the said unit being set along a feed path of the fabric and comprising a sensor for the detection of said marking and a lighting device, which in turn comprises a first illuminator, set on the opposite side of the feed path with respect to the sensor and designed for illuminating said marking to transmit to the sensor a light signal that passes through the fabric, the unit being characterized in that said sensor is a linear CMOS viewing sensor having a viewing resolution on the fabric of at least 68 ⁇ m.
  • number 1 designates as a whole a unit for detecting a marking M made on a knitted fabric T fed, in a substantially continuous way, along a vertical feed path P.
  • the unit 1 is set along the path P, and comprises a box-type body 2 having a front wall 3, which is designed to come into substantial contact with the fabric T and is provided with a window 4 enclosed by a glass 5.
  • the unit further comprises a sensor 6 for detection of the marking M, the said sensor being supported inside the body 2, and a lighting device 7 designed for illuminating the fabric T to send a light signal S to the sensor 6.
  • the sensor 6 is a linear CMOS viewing sensor having a viewing resolution on the fabric T of at least 68 ⁇ m, and a viewing area on the fabric T defined by a height, measured parallel to a direction D of feed of the fabric T itself, of 3 mm, and by a width, measured transverse to the direction D of feed, of 70 mm.
  • the unit 1 is further equipped with an anamorphic focusing device 8, which is designed to receive the light signal S and comprises two prisms 9 and 10 and a mirror 11, designed to develop a focal length of 25.5 cm in a direction orthogonal to a direction of passage of the light signal S with respect to the fabric T.
  • the mirror 11 is set inside the body 2 in a position directly facing the glass 5 and has a reflecting surface 12 of its own inclined by an angle of 45° with respect to the glass 5.
  • the two prisms 9 and 10 are supported inside the body 2 by a two-axes slide 13, which is designed to enable correct positioning of the prisms 9 and 10 themselves with respect to the sensor 6, which is fixed on a support that enables movements along four axes during assembly to obtain a proper collimation with the optical system.
  • the lighting device 7 comprises two illuminators 20 and 21, of which the illuminator 20 is set on the opposite side of the path P of feed with respect to the sensor 6 and is designed to illuminate the marking M so as to transmit to the sensor 6 a light signal S that passes through the fabric T, whilst the illuminator 21 is set on the same side as the sensor 6 with respect to the path P and is designed to illuminate the marking M so as to transmit to the sensor 6 a light signal S reflected by the fabric T. Consequently, the illuminator 20 is set outside the body 2 in a position facing the window 4, whilst the illuminator 21 is set inside the body 2, which is also set in a position facing the window 4.
  • Both of the illuminators 20 and 21 are built with solid-state monochromatic emitters, are activatable alternately with respect to one other, and each comprises two rows of LEDs 24 set on opposite sides of the viewing area.
  • the LEDs 24 of each row define a given angle with respect to the path P so as to enhance the surface roughness of the fabric T.
  • the illuminators 20 and 21 are alternately lit up and turned off with respect to one another, and at each lighting-up there is acquired an image of the fabric T detected by the sensor 6. Operating in this manner, it is possible to acquire alternately images of different perspectives of the same portion of fabric T. In addition, the fact of keeping the illuminators 20 and 21 cyclically turned on and turned off enables optimal exploitation of the characteristics of the LEDs 24 in such a way as to double their lighting power.
  • the unit 1 comprises a digital signal processor (DSP) and a microcontroller 25, which are set in a dedicated housing outside the body 2, and are connected to the sensor 6 by means of shielded and differential electrical lines for detecting the marking M.
  • the microcontroller 25 is a microprocessor containing an on-board memory and peripheral equipment, and its use together with that of the DSP makes possible implementation of a very sophisticated mathematical algorithm to obtain, in this way, a proper detection of many of the types of markings M.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
EP02019978A 2001-10-16 2002-09-05 Vorrichtung für die Detektion einer Markierung auf ein Gewebe Withdrawn EP1302766A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20010975 ITTO20010975A1 (it) 2001-10-16 2001-10-16 Unita' per la rivelazione di una marcatura su di un tessuto.
ITTO20010975 2001-10-16

Publications (2)

Publication Number Publication Date
EP1302766A2 true EP1302766A2 (de) 2003-04-16
EP1302766A3 EP1302766A3 (de) 2004-08-11

Family

ID=11459258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02019978A Withdrawn EP1302766A3 (de) 2001-10-16 2002-09-05 Vorrichtung für die Detektion einer Markierung auf ein Gewebe

Country Status (2)

Country Link
EP (1) EP1302766A3 (de)
IT (1) ITTO20010975A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2103927A2 (de) 2008-03-17 2009-09-23 EADS Deutschland GmbH Verfahren zur automatisierten Überwachung textiler Verstärkungsmaterialien für die Herstellung faserverstärkter Kunststoffe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5533145A (en) * 1992-12-31 1996-07-02 Zellweger Uster, Inc. Continuous two dimensional monitoring of thin webs of textile materials
DE19643406A1 (de) * 1996-10-21 1998-04-30 Deutsches Textilforschzentrum Oberflächendetektionssystem für Warenbahnen
DE29911072U1 (de) * 1999-04-30 1999-09-23 Mahlo Gmbh & Co Kg Vorrichtung zur Bestimmung des Verzugswinkels einer Textilbahn

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5533145A (en) * 1992-12-31 1996-07-02 Zellweger Uster, Inc. Continuous two dimensional monitoring of thin webs of textile materials
DE19643406A1 (de) * 1996-10-21 1998-04-30 Deutsches Textilforschzentrum Oberflächendetektionssystem für Warenbahnen
DE29911072U1 (de) * 1999-04-30 1999-09-23 Mahlo Gmbh & Co Kg Vorrichtung zur Bestimmung des Verzugswinkels einer Textilbahn

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2103927A2 (de) 2008-03-17 2009-09-23 EADS Deutschland GmbH Verfahren zur automatisierten Überwachung textiler Verstärkungsmaterialien für die Herstellung faserverstärkter Kunststoffe
DE102008014656A1 (de) * 2008-03-17 2009-10-01 Eads Deutschland Gmbh Verfahren zur automatisierten Überwachung textiler Verstärkungsmaterialien für die Herstellung faserverstärkter Kunststoffe

Also Published As

Publication number Publication date
ITTO20010975A1 (it) 2003-04-16
EP1302766A3 (de) 2004-08-11

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