EP0291729B1 - Procédé et dispositif pour mesurer la position des fils de trame ou des rangées de mailles dans les bandes textiles - Google Patents

Procédé et dispositif pour mesurer la position des fils de trame ou des rangées de mailles dans les bandes textiles Download PDF

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Publication number
EP0291729B1
EP0291729B1 EP88106603A EP88106603A EP0291729B1 EP 0291729 B1 EP0291729 B1 EP 0291729B1 EP 88106603 A EP88106603 A EP 88106603A EP 88106603 A EP88106603 A EP 88106603A EP 0291729 B1 EP0291729 B1 EP 0291729B1
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EP
European Patent Office
Prior art keywords
offset angle
angle
weft threads
transducers
slit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88106603A
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German (de)
English (en)
Other versions
EP0291729A2 (fr
EP0291729A3 (en
Inventor
Hellmut Dr. Ing. Beckstein
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.)
Mahlo GmbH and Co KG
Original Assignee
Mahlo 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 Mahlo GmbH and Co KG filed Critical Mahlo GmbH and Co KG
Publication of EP0291729A2 publication Critical patent/EP0291729A2/fr
Publication of EP0291729A3 publication Critical patent/EP0291729A3/de
Application granted granted Critical
Publication of EP0291729B1 publication Critical patent/EP0291729B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D06H3/12—Detecting or automatically correcting errors in the position of weft threads in woven fabrics
    • D06H3/125—Detecting errors in the position of weft threads

Definitions

  • the invention relates to a method and a device according to the preamble of claim 1 or 6 or 11.
  • a device for measuring the draft angle, in which a single gap with a photosensor arranged behind it is rotated back and forth by an electrodynamic drive system, the rotary movement being close to the mechanical resonance frequency of the system around a central angle.
  • the speed of the rotary movement is therefore predetermined by the system.
  • the output signal of the photosensor is summed up via an amplifier, the sign of the amplification always being reversed when the central angle is exceeded.
  • the signal summed up over a period therefore becomes zero when the measured values are distributed symmetrically around the central angle. This is the case when the weft has the same direction as the center angle.
  • a follow-up control is provided in the known system, which adjusts the overall system or the center angle in accordance with the current measured value such that the center angle always runs parallel to the weft thread.
  • a device according to the preamble of claim 6 and a method according to the preamble of claim 1 or 11 are known from DE-A 1 109 636, two photocells with slit diaphragms lying in front of them being arranged opposite one light source, the central axes of which are angular to one another stand.
  • a value for the angular profile of the weft thread is derived from the difference signal of the photocells without the arrangement having to be moved mechanically. This arrangement depends on the correct measurement of the luminous flux passing through the textile web, which presents certain difficulties with a single photo sensor, since the luminous flux depends not only on the spacing of the weft threads from one another and their thickness, but also on the color of the textile web .
  • the main idea of the present invention is therefore that it is not the total luminous flux within the gap-shaped section that is considered, but rather its "pattern" within the area or the movement of the pattern within the area. This means that the brightness values can be divided into just two levels (light / dark), which significantly reduces the sensitivity to interference. Knowing this idea, the mathematical Derive rule for determining the draft angle from geometric considerations.
  • the arrangement is such that a light source 11 is arranged behind Reflector 12 radiates onto a textile web 10 which is conveyed past the arrangement in the direction of arrow P.
  • a CCD line 14 or 15 with a lens 13 in front of it is arranged opposite the light source 11 with reflector 12.
  • a number of such arrangements are provided across the entire width of the fabric web, so that, for example, even a garland warping can be detected by determining the warping angle in sections.
  • the wefts 1 and 2 appear as dark fields, while the gaps between them appear as light fields.
  • the weft threads 1 and 2 shift, as is indicated in Fig. 2 with the weft threads 1 'and 2' shown. While the weft threads pass the CCD lines 14 and 15, the individual sensor elements 14-1, 14-2 ....; 14-n or 15-1 ...., 15-m of the CCD lines 14 and 15 progressively exposed or darkened.
  • FIG. 3 shows in the step-like course of the output signals the “blurring” which inevitably occurs in the edge areas between light and dark zones results.
  • the sensor output signals are compared with a threshold SW in order to obtain signals that can be processed and are fault-free. All values above the threshold SW are classified as "light”, all values below as "dark”.
  • the value of interest can be calculated.
  • the abbreviations used are first explained in more detail with reference to FIGS. 4 and 5.
  • a the distance between two dark zones (weft threads 1 to 5)
  • d the thickness of the weft threads, that is to say the "dark field”
  • S The length of the gap-shaped section, which corresponds to the line length of the sensor, is denoted by S. 1 denotes the maximum length of a "dark group", ie the number of successively darkened sensor elements (multiplied by their length).
  • L denotes the "period" corresponding to the aforementioned variable 1, that is to say the distance on the CCD line within which the pattern is repeated.
  • the drafting angle is designated by ⁇ , that is to say the angle between a weft thread 1 to 9 and the axis perpendicular to the transport direction P (transport direction normal).
  • ⁇ the angle between the CCD lines 14, 15 and the transport direction normal is designated, while ⁇ denotes the angle between a CCD line 14 or 15 and a weft thread.
  • the calculation is particularly simple if the two angles ⁇ 0 and ⁇ n are chosen to be of the same magnitude. Equation 3 is then simplified where the above definitions apply.
  • the derivation of the draft angle ⁇ is also particularly simple because the CCD lines 14 and 15 work digitally and the values for z are available as countable individual values anyway.
  • angle ⁇ 0 ⁇ n selected at 15 °.
  • the CCD lines are as long as possible (in relation to the number of threads). This can also be achieved by appropriate optics, in which a reduced image of the tissue is projected onto the CCD lines.
  • the numbers z or the lengths 1 are obtained over several scanning cycles of the CCD lines. This enables a significant increase in the signal-to-noise ratio.
  • the time interval ⁇ 15 according to FIG. 7 is therefore larger than the interval ⁇ 14 observed with the CCD line 14.
  • the angle ⁇ between the CCD line 14 and the weft threads 1 to 8 then results in The draft angle ⁇ can be calculated according to equation 2.
  • This embodiment of the invention also has the advantage that the time intervals ⁇ 14 and ⁇ 15 used in equation 7 can be averaged over a particularly large number of individual values, with of course not only the time intervals between the rising edges of corresponding bright areas, but also between the falling ones Flanks of the averaging can be used.
  • FIG 8 shows an example of a circuit arrangement (in principle) which is suitable for carrying out the method described above.
  • the CCD lines 14 and 15 are, as shown in Fig. 8, driven by a common sensor driver 20 and give their, the applied amount of light output signals via buffer amplifiers 16, 16 'and blocking circuits 17 to sample and hold circuits 18 to others Buffer amplifier 19, 19 'further.
  • the blocking circuits 17, 17 'and the sample and hold circuits 18, 18' are - like the sensor driver 20 - synchronized via a timing circuit 22.
  • the output signals reach the inputs of controllable output amplifiers 23, 23', the outputs of which are routed to inputs of threshold circuits 24 which carry out the black / white discrimination.
  • the output lines 28, 28 thus represent binary outputs which are led into an I / O interface.
  • the I / O interface 33 is connected to a CPU 34, which has access to a RAM 35 via data lines. Furthermore, an output interface 36 is provided, which is in a controlling connection via data line with the subsequent organs for compensating for the angle of distortion.
  • the output signals of the buffer amplifiers 19, 19 ' are passed on to the I / O interface 33 via threshold switches 25, 25'.
  • the threshold switches 25, 25' By appropriately setting the threshold levels, it is possible to determine whether the CCD lines 14, 15 are receiving too much light, that is to say they are operated in saturation.
  • This saturation signal is further passed on via a latch 26, 26 'to the I / O interface 33, each latch 26, 26' being controlled via a start signal line 30, which is also routed into the I / O interface 33.
  • the timing control circuit 22 also controls an exposure time control 21 to which the CPU 34 has direct access via the I / O interface 33 and an exposure control line 32.
  • a clock line 31 connects the timing control circuit 22 to the CPU 34 for synchronization (via the interface 33).
  • the threshold values SW can be set by the CPU 34 via lines 29, 29 '.
  • the evaluation device 37 designed in this way can be programmed so that the method described above for calculating the draft angle ⁇ is carried out.
  • the CCD lines 14, 15 do not necessarily have to be designed as separate line arrangements, but rather can be arranged in a single matrix arrangement.
  • the angles ⁇ 0 and ⁇ n are then defined by appropriate selection of the matrix elements.
  • two line-shaped transducers of an arrangement similar to that according to FIG. 6 are also provided.
  • these are not CCD lines, but position-sensitive, line-shaped photodiodes whose output signals correspond to the brightness distribution of the light-sensitive surface.
  • Such converters are, for example, lateral effect photodiodes or photodiodes with a gray wedge in front of them. If a line pattern, as drawn in FIG. 6, moves over such a converter, an output signal results with an essentially sawtooth-shaped AC component.
  • These alternating current components are now compared with one another in the evaluation device, which can be constructed in a manner known per se, either with regard to the rate of change or with regard to the phase relationship of the signals to one another.

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

Claims (11)

  1. Procédé pour mesurer la position des fils de trame ou des rangées de mailles (angle d'étirage α) dans des bandes textiles (10) transportées en continu, dans lequel on observe, par transmission de lumière ou par réflexion de lumière, au moyen de capteurs photo-électriques (14,15) propres à délivrer des valeurs de mesure, au moins une section de forme oblongue de la bande textile (10), dont la largeur est faible et la longueur est grande en comparaison de l'épaisseur des fils de trame et dont l'axe longitudinal fait un angle constant et défini par rapport à la direction de transport,
    caractérisé en ce que l'on règle les valeurs de luminosité à l'intérieur de la section en deux degrés ou domaines (clair, foncé) au moyen d'au moins un interrupteur à seuil (24,24') et on détermine celles des portions à l'intérieur de la section, au sein desquelles les valeurs de luminosité correspondent en continu à l'un des degrés, et on détermine soit le nombre ou la longueur (totale) des portions d'un degré par analyse discrète des valeurs de mesure,
    soit la vitesse à laquelle les portions d'un degré se déplacent dans la section,
    et on en déduit et évalue numériquement l'angle d'étirage (a) du fil de trame.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on déduit le sens de l'angle d'étirage (α) à partir de la direction dans laquelle les portions se déplacent dans la section.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'on considère deux sections de forme oblongue qui incluent entre elles un angle défini et l'on compare ensemble le nombre de portions dans la section ou les vitesses dans les sections.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que, avant de déduire l'angle d'étirage, on réalise une moyenne sur plusieurs déterminations de nombres ou de vitesses, séparées dans le temps.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'on applique la lumière transmise ou la lumière réfléchie sous forme d'éclairs ou en ce que l'on réalise l'observation sur des moments courts espacés dans le temps.
  6. Dispositif pour mesurer la position des fils de trame ou des rangées de mailles (angle d'étirage α) dans des bandes textiles (10) transportées en continu, comportant au moins une source d'éclairage (11), au moins un capteur photo-électrique (14,15) et au moins un organe d'exploitation (37) pour exploiter les signaux de sortie du capteur et donner une valeur généralement proportionnelle à l'angle d'étirage (α), caractérisé
    en ce qu'au moins un des capteurs (14,15) est réalisé sous la forme d'une disposition oblongue (14,15) d'une pluralité d'éléments détecteurs (14-1 à 14-n ; 15-1 à 15-m) pouvant être balayés séparément,
    en ce que l'organe d'exploitation (37) comprend un interrupteur à seuil (24) qui divise les signaux de sortie du capteur en deux degrés ou domaines (clair, foncé) et qui est réalisé de telle façon que l'on détermine
    soit le nombre des éléments détecteurs ayant des valeurs de sortie de même degré (clair, foncé),
    soit la vitesse à laquelle les valeurs de sortie de même degré se déplacent sur la disposition oblongue (14,15),
    et en ce que l'organe d'exploitation (37) comprend un calculateur numérique (34,35) qui est réalisé de telle façon que l'on déduise et évalue l'angle d'étirage (α) à partir du nombre ou de la vitesse.
  7. Dispositif selon la revendication 6, caractérisé en ce que, dans le cas d'un capteur réalisé sous la forme d'une seule barrette à transfert de charge CCD (15) l'organe d'exploitation (37) comprend un organe pour donner le nombre de fils ou un organe pour donner la vitesse de transport.
  8. Dispositif selon la revendication 6, caractérisé en ce que deux barrettes à transfert de charge CCD (14,15) ayant avantageusement la même longueur sont disposées suivant un angle défini (β₀ ; βn) par rapport à la normale à la direction de transport.
  9. Dispositif selon l'une des revendications 6 à 8, caractérisé en ce que la source d'éclairage (11) est réalisée sous la forme d'un tube de flash.
  10. Dispositif selon l'une des revendications 6 à 9, caractérisé en ce qu'une optique à lentille (cylindrique) (13) est prévue devant chacune des barrettes à transfert de charge CCD (14,15).
  11. Procédé pour mesurer la position des fils de trame ou des rangées de mailles (angle d'étirage α) dans des bandes textiles (10) transportées en continu, dans lequel on observe par transmission de lumière ou par réflexion de lumière, au moyen de capteurs photo-électriques (14,15) propres à délivrer des valeurs de mesure, au moins deux sections de forme oblongue de la bande textile (10), dont la largeur est faible et dont la longueur est grande en comparaison de l'épaisseur des fils de trame et dont l'axe longitudinal fait un angle constant et défini par rapport à la direction de transport,
    caractérisé en ce que l'on détermine les répartitions de luminosité issues des capteurs (14,15) ou la position des centres de gravité de densité d'éclairage provenant des capteurs (14,15) et l'on produit des signaux de sortie des capteurs correspondants,
    et en ce que l'on déduit et évalue numériquement l'angle d'étirage (α) à partir des vitesses de modification et/ou des positions de phase des signaux de sortie des capteurs et de leur comparaison.
EP88106603A 1987-05-22 1988-04-25 Procédé et dispositif pour mesurer la position des fils de trame ou des rangées de mailles dans les bandes textiles Expired - Lifetime EP0291729B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3717305A DE3717305C1 (de) 1987-05-22 1987-05-22 Verfahren und Vorrichtung zur Messung der Schussfaden- oder Maschenreihenlage von Textilbahnen
DE3717305 1987-05-22

Publications (3)

Publication Number Publication Date
EP0291729A2 EP0291729A2 (fr) 1988-11-23
EP0291729A3 EP0291729A3 (en) 1989-11-15
EP0291729B1 true EP0291729B1 (fr) 1993-07-07

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EP88106603A Expired - Lifetime EP0291729B1 (fr) 1987-05-22 1988-04-25 Procédé et dispositif pour mesurer la position des fils de trame ou des rangées de mailles dans les bandes textiles

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Country Link
US (1) US4890924A (fr)
EP (1) EP0291729B1 (fr)
JP (1) JPS63309671A (fr)
DE (2) DE3717305C1 (fr)

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Also Published As

Publication number Publication date
EP0291729A2 (fr) 1988-11-23
US4890924A (en) 1990-01-02
JPS63309671A (ja) 1988-12-16
EP0291729A3 (en) 1989-11-15
DE3717305C1 (de) 1988-07-28
DE3882171D1 (de) 1993-08-12

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