EP0310838A1 - Verfahren und Vorrichtung zur optischen Überwachung einer Maschenware - Google Patents

Verfahren und Vorrichtung zur optischen Überwachung einer Maschenware Download PDF

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Publication number
EP0310838A1
EP0310838A1 EP88115186A EP88115186A EP0310838A1 EP 0310838 A1 EP0310838 A1 EP 0310838A1 EP 88115186 A EP88115186 A EP 88115186A EP 88115186 A EP88115186 A EP 88115186A EP 0310838 A1 EP0310838 A1 EP 0310838A1
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EP
European Patent Office
Prior art keywords
knitted fabric
scanning
monitoring device
optical monitoring
signals
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Withdrawn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
EP88115186A
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German (de)
English (en)
French (fr)
Inventor
Peter Flämig
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.)
Protechna Herbst GmbH and Co KG
Original Assignee
Protechna Herbst GmbH and Co KG
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 Protechna Herbst GmbH and Co KG filed Critical Protechna Herbst GmbH and Co KG
Publication of EP0310838A1 publication Critical patent/EP0310838A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/20—Indicating, warning, or safety devices, e.g. stop motions responsive to defects, e.g. holes, in knitted products

Definitions

  • the invention relates to a method and a device for the optical monitoring of a knitted fabric during its manufacture in a knitted fabric processing machine for defects, an optical scanning device scanning the width of the knitted fabric transversely to the take-off direction and, when a knitted fabric error is detected, indicating this and / or stopping the knitted fabric processing machine.
  • Warp knitting machine guards for warp knitting machines are known from the operating instructions KW warp knitting machine guard from Erwin Sick GmbH Optik, Electronics. These warp knitting machine monitors are used to monitor almost smooth monochrome fabrics.
  • These known warp knitting machine guards have a guide rail which is arranged above the knitted fabric transversely to their running direction. A slide can be moved longitudinally on the guide rail, which is provided with a rod-like holder, at the free end of which a reflex light barrier head is provided, which is positioned just above the knitted fabric.
  • Electronic circuit parts are provided within the slide, which are connected to the reflex light barrier consisting of a light transmitter and a light receiver.
  • the carriage assigns a pantograph connection electrical conductors of the guide rail.
  • the knitted fabric is gripped by so-called spreader bars, which are used for the fabric take-off in the take-off direction.
  • Such a reflex light barrier guided by the guide rail, is moved transversely to the withdrawal direction of the knitted fabric.
  • the known warp knitting machine guard has the advantage that the reflex light barrier is arranged just above the finished knitted fabric in the area of the knitting tools.
  • the reflex light barrier cannot be moved to the edge of the finished product or beyond the edge of the finished product, since this warp knitting machine monitor is complex and its dimensions and arrangement are unfavorable.
  • pantograph on the light barrier slide is sensitive to dirt and corrosion. Furthermore, it is disadvantageous that the holder located between the reflex light barrier and the light barrier slide is moved through the working area of the operator. It is also disadvantageous that the reflex light barrier cannot be moved directly between the knitted fabric spreader and the warp knitting tools, so that complete scanning of the knitted fabric is not guaranteed. It is also disadvantageous that with the help of the known warp knitting machine no patterned or interrupted knitted fabric can be monitored.
  • an optical web monitoring device is known, the one Has lighting arrangement, which images the pupil of the illumination with a concave mirror strip in the observation pupil of a camera lens of a diode line camera in order to achieve the maximum achievable light yield.
  • a troubleshooting device with a laser scanner is operated, the same mirror strips being used.
  • This optical web monitoring device is used to check material webs in which no mechanically fast moving optical components are to be used. The light emitted by light sources and reflected by the material webs should be perceived by a photo receiving arrangement with the least possible losses.
  • the transmission concave mirror used is dimensioned such that the lighting strip produced on the material web extends just over the entire width of the material web.
  • the lighting strip on the surface of the material web is depicted on the diode row, which is provided within the photographic camera, in a greatly reduced size.
  • the entrance pupil is imaged into the objective in order to generate a sufficient light intensity for the diode row.
  • This known optical web monitoring device which deals primarily with imaging issues and increasing the efficiency of the light intensity on the photoreceiver arrangement, shows no solution to detect thread-related knitting errors even with interrupted or patterned knitting. Furthermore, the optical path monitoring device for such error detection is due to its complex structure online-type knitting error detection in the field of knitting tools not suitable.
  • the object is achieved by the optical scanning device scans the knitted fabric line by line and supplies the scanning signals generated in this way to a digital processing circuit, - That the scanning signals are stored in a reference mode as pattern signals in the digital processing circuit and - That the scanning signals in a subsequent operating mode during the manufacture of the knitted fabric are compared as operating scanning signals with the sample signals corresponding to the scanning position for agreement and an error signal is emitted if they do not match.
  • an error signal is only emitted if, after a predetermined number of successive line scans, an inequality is found for the same position in the line. If an inequality is found in at least one point of a scanning line during a comparison process, this does not therefore lead to an error message. Only when the predetermined number of consecutive inequality signals for the same line position is generated, does the error signal generation and / or a shutdown of the knitwear processing machine follow.
  • the new ones are found after a fault has been found, the knitted fabric processing machine has been stopped, the fault has been rectified and the knitted goods processing machine has been switched on again Sampling or comparison processes are initiated after a predetermined delay time, after which the defect area of the knitted fabric has definitely moved out of the area of the scanning device. This ensures that when scanning and comparing again, no additional error signal is generated for the defective location of the knitted fabric that has already been assessed.
  • a plurality of lines of the knitted fabric are scanned in the reference mode, the corresponding pattern signals of a scanning position of a plurality of lines being averaged, viewed in the direction of withdrawal of the knitted fabric.
  • an optical monitoring device for a knitted fabric processing machine with an optical reflex scanning device which can be moved across the knitted fabric web transversely to the knitted fabric withdrawal direction, the reflex scanning device having a light source and a light receiver, in that the light source and the light receiver at the respective end of a
  • the light shaft provided parallel to the knitted fabric plane is arranged, the length of which is at least equal to the width of the knitted fabric, a 90 ° angular mirror being arranged in a scanning carriage movable along the light shaft, the angle bisector enclosed by the two partial mirrors running parallel to the beam path and the the first partial mirror facing the light source is designed to be fully reflective, while the second partial mirror facing the light receiver is semitransparent, so that the transmitted light rays pass through the second partial mirror and the light rays reflected by the knitted fabric are deflected to the light receiver.
  • the mirror carriage can be moved beyond the edge region of the knitted fabric, which gives the advantage that the edge of the knitted fabric can be detected. It is also advantageous that the reflected light beam can be guided in the region between the so-called spreader for the knitwear and the knitwear tools with a correspondingly strong concentration. Distance-related changes in intensity on the photo receiver of the photo receiver arrangement, which occur due to the different position of the scanning carriage, have no effect in the comparison process. Tilting of the 90 ° mirror arrangement does not change the direction of incidence of the received light beam.
  • a semiconductor laser with collimator optics is used as the light source.
  • the light receiver consists of at least two photo receivers, which are arranged vertically one above the other in relation to the knitted fabric plane.
  • a lens arrangement is provided in the region of the edge of the 90 ° angle mirror on the side facing the light receiver.
  • the focal length of this lens arrangement is equal to or greater than the distance of the 90 ° angle mirror from the knitted fabric.
  • the image size of the knitted fabric image on the light receiver is kept approximately constant, regardless of where the scanning carriage with the 90 ° angle mirror arrangement is located.
  • Another advantage of the 90 ° angle mirror can be seen in the fact that the receiver beam arriving at the light receiver does not leave the photoreceiver arrangement when the scanning carriage is tilted, but maintains its alignment. This has the advantage that particularly wide knitwear can be monitored for defects.
  • an angle transmitter is provided which emits position signals during the movement of the scanning carriage, which signals the position of the scanning carriage.
  • a pair of photo receivers is used, one of which is connected to a control circuit for regulating the laser power of the semiconductor laser.
  • differential signals from signals from neighboring photo receivers are integrated in an integration circuit.
  • the one photo receiver of the pair of photo receivers is used for evaluating the line scans, but also the photo receiver which is used to regulate the laser beam power.
  • the error signal can be increased accordingly by comparing the signals of the two photo receivers of the pair of photo receivers, which has the advantage that even weak error signals lead to a corresponding amplification. If the photo receivers are increased, a corresponding increase in the signal can be achieved by accumulation.
  • the light receiver is connected via an analog-digital converter to a digital processing circuit, which has a control circuit and a read and write memory, the digital processing circuit having a mode selection device for selecting a reference mode and an operating mode, the read and write memory in Operating mode is switched to read mode.
  • the digital processing circuit has a microcomputer which, in addition to the analog-digital converter of the light receiver, is connected to the angle encoder and a motor controller, the pattern data being stored in the memory only in the reference mode are enrollable.
  • an optical monitoring device for a knitted fabric processing machine with a light source and a light receiver and with a processing circuit, namely in that below the knitted fabric a light source arrangement extending over the entire width and above the knitted fabric a camera capturing the entire width thereof digital image converter device (CCD) is provided, which is connected to the digital processing circuit having a microcomputer, a mode stage being provided by which the digital processing circuit can be switched in the reference mode or operating mode, in that the current operating sample data as actual value data in the digital processing circuit line by line with the reference data read from a memory of the digital processing circuit are compared.
  • CCD digital image converter device
  • Such an optical monitoring device is distinguished by its particular speed in line scanning, with no mechanically movable parts being included.
  • This optical monitoring device is particularly suitable for interrupted or patterned knitwear, which can not only be streaked lengthways, but can also be patterned as desired, and are also advantageous because of their speed.
  • the optical monitoring device is arranged so that the knitting of the knitted fabric takes place in the immediate vicinity of the knitting tools and beyond the lateral edge.
  • warp threads denote a warp knitting machine which run through perforated needles 6, 7, 8, 9 and 10. With 11, 12, 13, 14 and 15 boards are designated.
  • the knitted fabric or the finished knitted fabric bears the reference number 16.
  • a guide rail for a scanning carriage 18 is designated by 17, which can be moved by motor along the guide rail in a manner not shown. The movement takes place either in direction A or B.
  • the guide rail 17 is at the same time designed as a light shaft, in which a light source and a light receiver are respectively arranged at one end in a manner not shown.
  • the light beam emerging from the scanning carriage 18 is designated by 19, which strikes the finished knitted fabric with a small diameter and causes an illumination spot 20 there.
  • the incoming light beam 19 is reflected by the knitted fabric and reaches the scanning carriage 18 again as a reflected light beam 21.
  • a semiconductor laser 22 is located in the light shaft 17 as the light source.
  • a photo receiver 23 is used as the light receiver, which is relative to the semiconductor laser 22 with respect to the level of the knitted fabric 16 is staggered.
  • the scanning carriage 18 there is a 90 ° angle mirror 24 which is arranged such that its bisector 25 is parallel to the light beam 26 of the semiconductor laser 22 or parallel to the plane of the knitted fabric 16.
  • the transmitted light beam bundle 26 is deflected downward onto the knitted fabric by the 90 ° angle mirror and, after its reflection on the knitted fabric, strikes the 90 ° angle mirror again in order to then strike the photo receiver 23 as a received light beam bundle 27.
  • an angle encoder is designated, which emits 18 position pulses during the movement of the scanning carriage in order to signal the position of the scanning carriage.
  • a convex lens 30 is arranged in the scanning carriage 18 next to the 90 ° angle mirror 24 on the side facing the photoreceptor 23, specifically in the region of the Pivot point of the 90 ° angle mirror 24.
  • the upper partial mirror 24a of the 90 ° angle mirror is designed to be fully reflective, while the lower partial mirror 24b is semi-transparent. This means that the transmitted light beam 26 is fully reflected on the partial mirror 24a in order to then reach the knitted fabric 16 through the semi-transparent partial mirror 24b.
  • the light beam on the semi-transparent partial mirror 24b is deflected by 90 ° and passes through the convex lens 30 as a received light beam Photo receiver 23.
  • the focal length of the convex lens 30 corresponds approximately to the distance of the 90 ° angle mirror from the knitted fabric 16.
  • the convex lens 30, which is moved along with the scanning carriage 18, acts as a second receiver lens, which has the advantage that an error is imaged on the photo receiver its size is almost independent of the position of the scanning carriage. This means that a slight tilting of the scanning carriage 18 can occur in particular in the case of wide knitted fabrics, in which the bisector of the 90 ° angle mirror no longer runs parallel to the transmitted light beam or the plane of the knitted fabric.
  • the 90 ° angle mirror compensates for such canting, while the convex lens 30 prevents the received light beam from wandering away (parallel displacement of the received light beams and zoom effect) from the receiving surface of the photo receiver.
  • FIG. 4 shows a plan view of part of the warp knitting machine the finished knitted fabric 16, which is captured by a spreader 31.
  • the individual warp threads and needles are designated by 32.
  • the scanning path of the scanning light beam is designated by 33. It runs between the row of needles 32 and the spreader 31. This has the advantage of monitoring the knitted fabric 16 in the immediate area of the row of needles 32, i.e. right where the knitwear is made. In this way, warp-related errors are immediately identified.
  • the photo receiver arrangement consists of a split photo receiver diode, the individual diodes of which are designated by 34 and 35.
  • 37 denotes the size of a knitwear defect which, according to FIG. 5, is currently being imaged on the photoreceptor 35. This image of the error 37 migrates from the photodiode 35 to the photodiode 34 in the course of the movement of the scanning carriage 18.
  • the first photodiode 34 is connected via an amplifier 38 to a control stage 39 for controlling the laser power of the semiconductor laser 22.
  • the second photodiode 35 is connected via an amplifier 40 to an analog-digital converter 41, the output of which is connected to a microcomputer 42.
  • the microcomputer contains a microprocessor 43, a program memory 44, a working memory (not shown) and a read and write memory 45.
  • a first interface circuit is designated by 46, while a second interface circuit is identified by reference numeral 47.
  • a mode circuit 48 the mode of the microcomputer 42 can be controlled by means of buttons 49 and 50.
  • the interface circuit 47 has on the one hand a connection to the angle encoder 29 and on the other hand a control connection to a motor control stage 51, the output of which is connected to the drive motor 28.
  • the motor 28 moves the via a gear connection, in particular via a closed toothed belt Scanning carriage 18, with position signals being supplied to the microcomputer 42 by the angle encoder 29.
  • the scanning carriage 18 is moved to the left in accordance with block 52.
  • the microcomputer 42 decides whether it has started or not.
  • a switch-on delay of the optical monitoring device is started, which in the present case includes a switch-on delay of 10 s.
  • the warp knitting machine is switched on, so that a predetermined length of the knitted fabric is moved in the draw-off direction depending on the processing speed.
  • the optical monitoring device is switched on.
  • a possibly corrected defect in the knitted fabric must be moved out of the field of view of the scanning beam.
  • the microcomputer 42 is switched to the reference mode.
  • the scanning carriage is moved across the motor control stage 51 and the motor 28 transversely to the knitted fabric 16, whereupon the transmitted light beam scans the knitted fabric in the form of a line.
  • the microprocessor 43 controls the scanning data as sample data in the read and write memory 45.
  • a repeated line-by-line scanning of the knitted fabric can be carried out take place, whereupon an average is formed for the scan data of the same line position. In this case, the averaged line data are then stored in the read and write memory.
  • the read and write memory therefore stores the scan data generated in the reference mode in the course of the movement of the transmitted beam, which are later available as reference data. Based on this reference mode, knitted fabrics of any width, interruptions or patterns can be scanned and later examined for errors.
  • the operating mode is initiated in block 56.
  • the scanning carriage 18 constantly moves back and forth.
  • the sample values or data generated in this way are compared as operating sample signals with the assigned line position-dependent reference data.
  • no data is written into the read and write memory, but only the stored sample data is read out for comparison purposes.
  • this error message occurs only after a predetermined number of consecutive line scans provided that relevant line position consecutive inequality signals were generated.
  • the microprocessor 43 determines whether the engine 28 is running or not. If the motor 28 is running, the operating mode is repeated. In this way, line scanning continues until a predetermined number of inequalities are determined in succession for the same line position.
  • Fig. 8 the parts corresponding to the parts of Fig. 1 are given the same reference numerals. To distinguish them, however, they have indices. For clarity, only part of the warp threads 1 ', 2', 3 ', 4' and 5 'are shown.
  • a CCD camera 58 At a predetermined distance from the knitted fabric 16 'is a CCD camera 58 with a CCD photo receiver line with 4096 photosensitive pixels. In the chamber there are also analog-to-digital converters and a serial output interface.
  • a fiber optic transmission line is provided for the digital signals.
  • the entire logic for the CCD camera is provided with programmable digital components. 9 leads to an evaluation circuit 60, which contains a microcomputer 42 '.
  • the digital evaluation circuit is connected on the one hand to the drive motor 28 'and the angle encoder 29' and also contains a connection to a display stage 61.
  • the knitted fabric 16 ' is scanned line by line over the entire width, whereby the scan line is designated 62.
  • a lighting device which consists of fluorescent tubes 63, 64 and 65.
  • Each fluorescent tube has a luminous limb bent away at a right angle at its end region. Neighboring legs of the fluorescent tubes touch each other. In this way, a brightness distribution is generated across the entire width of the knitted fabric, which only causes a slight reduction in light at the joints or points of contact of adjacent fluorescent tubes.
  • a possibly occurring error is shown in the correct position on the display 61, which is designed as a display.
  • Corresponding typical CCD camera images as they appear in the display 61 are shown in FIGS. 10 and 11.
  • FIG. 10 shows the reference mode and the corresponding brightness curve over the width of the knitted fabric.
  • the brightness bumps appearing on the left and right of the display 61 signal the respective edge of the knitted fabric.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Treatment Of Fiber Materials (AREA)
EP88115186A 1987-10-06 1988-09-16 Verfahren und Vorrichtung zur optischen Überwachung einer Maschenware Withdrawn EP0310838A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3733791 1987-10-06
DE19873733791 DE3733791A1 (de) 1987-10-06 1987-10-06 Verfahren und vorrichtung zur optischen ueberwachung einer maschenware

Publications (1)

Publication Number Publication Date
EP0310838A1 true EP0310838A1 (de) 1989-04-12

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Application Number Title Priority Date Filing Date
EP88115186A Withdrawn EP0310838A1 (de) 1987-10-06 1988-09-16 Verfahren und Vorrichtung zur optischen Überwachung einer Maschenware

Country Status (4)

Country Link
US (1) US4984896A (enrdf_load_stackoverflow)
EP (1) EP0310838A1 (enrdf_load_stackoverflow)
JP (1) JPH01221555A (enrdf_load_stackoverflow)
DE (1) DE3733791A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0418157A1 (fr) * 1989-09-15 1991-03-20 Centre Technique Industriel dit: INSTITUT TEXTILE DE FRANCE Dispositif endoscopique pour la détection de défauts sur métier à tricoter circulaire
CN109632817A (zh) * 2019-01-15 2019-04-16 天津大学 一种基于准直激光束的织物织造在线疵点检测方法

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
DE4039991A1 (de) * 1990-12-14 1992-06-17 Limaba Limbacher Maschinenbau Verfahren zur fehlerkontrolle einer auf strickmaschinen erzeugten textilen warenbahn
DE4128346C2 (de) * 1991-08-27 1995-05-11 Fraunhofer Ges Forschung Maschine mit einer Prüfvorrichtung zur Qualitätskontrolle von Maschenware, insbesondere von Feinstrick- und Strickstrumpfhosen, -kniestrümpfen, -socken sowie Verfahren zur Sichtkontrolle von Maschenware
DE4209773C2 (de) * 1992-03-26 1994-09-08 Groz & Soehne Theodor Vorrichtung zum Ermitteln von Strukturfehlern in textilen Flächengebilden
US5345399A (en) * 1992-07-06 1994-09-06 Union Camp Corporation System and method for monitoring and controlling the width of a product
JPH0633368A (ja) * 1992-07-14 1994-02-08 Gunze Ltd 生地の検反方法およびその装置
DE4322803C2 (de) * 1993-07-08 1998-09-10 Mohndruck Reinhard Mohn Ohg Verfahren zum Überwachen der Vollständigkeit individuell bedruckter Erzeugnisse in der Online-Fertigung
US5912816A (en) * 1995-03-23 1999-06-15 Milliken & Company Method and apparatus to align knitting needles and guides
DE19628319C2 (de) * 1996-07-13 2000-11-23 Monforts Textilmaschinen Gmbh Einrichtung zum Messen der Rapportlänge eines plastischen Musters
US6219136B1 (en) 1998-03-03 2001-04-17 Union Underwear Company, Inc. Digital signal processor knitting scanner
AU2001297960A1 (en) * 2000-12-05 2002-10-21 Ambalux Corporation Detection method and apparatus
US6950717B1 (en) 2004-03-19 2005-09-27 Sara Lee Corporation System and method for controlling width and stitch density of a fabric web
US7437894B1 (en) * 2007-06-27 2008-10-21 Monarch Knitting Machinery Corp. Circular knitting machine with fabric scanner, and break-away mount for fabric scanner
CN102839496A (zh) * 2012-08-30 2012-12-26 无锡信捷电气股份有限公司 经编机视觉断线检测系统
EP3333292B1 (de) * 2016-12-12 2019-01-30 Karl Mayer Textilmaschinenfabrik GmbH Verfahren und hilfsanordnung zum einstellen einer kettenwirkmaschine
US11798154B2 (en) 2018-10-15 2023-10-24 Smartex Europe, Unipessoal Lda. Circular knitting machine and respective method to control textile quality by use of digital camera
EP3495542B1 (de) * 2019-03-21 2021-05-19 KARL MAYER STOLL R&D GmbH Kettenwirkmaschine, verfahren zur überprüfung einer qualität einer wirkware sowie ein system dafür

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US3596274A (en) * 1969-02-07 1971-07-27 Uniroyal Englebert Deutschlang Process and apparatus for testing filamentary webs
US3657727A (en) * 1970-03-10 1972-04-18 Maurice E Blevins Method and apparatus for detecting flaws in a fabric web by comparing the web diffraction pattern with a standard mask
BE859668A (nl) * 1977-10-13 1978-02-01 Goossens Gebroeders Nv Tuftfout-detectie-apparaat
DE3133428A1 (de) * 1980-08-25 1982-06-24 Výzkumný ústav pletařský, Brno Verfahren zum abtasten und auswerten von fehlern in textilien, insbesondere in maschenwaren, und vorrichtung zum durchfuehren dieses verfahrens
DE3536991C1 (de) * 1985-10-17 1987-01-02 Sipra Patent Beteiligung Textilbahn-UEberwachungsgeraet zum Registrieren von Fehlerstellen
GB2180929A (en) * 1985-09-24 1987-04-08 Sick Optik Elektronik Erwin Optical web-monitoring apparatus

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DE3335656C2 (de) * 1983-09-30 1986-08-28 Protechna Herbst GmbH & Co KG, 8012 Ottobrunn Vorrichtung zur fotoelektrischen Überwachung einer Kettenwirkmaschine
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Publication number Priority date Publication date Assignee Title
US3596274A (en) * 1969-02-07 1971-07-27 Uniroyal Englebert Deutschlang Process and apparatus for testing filamentary webs
US3657727A (en) * 1970-03-10 1972-04-18 Maurice E Blevins Method and apparatus for detecting flaws in a fabric web by comparing the web diffraction pattern with a standard mask
BE859668A (nl) * 1977-10-13 1978-02-01 Goossens Gebroeders Nv Tuftfout-detectie-apparaat
DE3133428A1 (de) * 1980-08-25 1982-06-24 Výzkumný ústav pletařský, Brno Verfahren zum abtasten und auswerten von fehlern in textilien, insbesondere in maschenwaren, und vorrichtung zum durchfuehren dieses verfahrens
GB2180929A (en) * 1985-09-24 1987-04-08 Sick Optik Elektronik Erwin Optical web-monitoring apparatus
DE3536991C1 (de) * 1985-10-17 1987-01-02 Sipra Patent Beteiligung Textilbahn-UEberwachungsgeraet zum Registrieren von Fehlerstellen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0418157A1 (fr) * 1989-09-15 1991-03-20 Centre Technique Industriel dit: INSTITUT TEXTILE DE FRANCE Dispositif endoscopique pour la détection de défauts sur métier à tricoter circulaire
FR2652161A1 (fr) * 1989-09-15 1991-03-22 Inst Textile De France Dispositif endoscopique pour la detection de defauts sur metier a tricoter circulaire.
US5133198A (en) * 1989-09-15 1992-07-28 Institut Textile De France Endoscopic apparatus for flaw detection on a circular knitting machine
CN109632817A (zh) * 2019-01-15 2019-04-16 天津大学 一种基于准直激光束的织物织造在线疵点检测方法
CN109632817B (zh) * 2019-01-15 2021-04-09 天津大学 一种基于准直激光束的织物织造在线疵点检测方法

Also Published As

Publication number Publication date
JPH01221555A (ja) 1989-09-05
DE3733791C2 (enrdf_load_stackoverflow) 1989-08-17
US4984896A (en) 1991-01-15
DE3733791A1 (de) 1989-04-27

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