EP2093173B1 - Dispositif et procédé de détection de caractéristiques d'orientation sur une bande de matériau - Google Patents

Dispositif et procédé de détection de caractéristiques d'orientation sur une bande de matériau Download PDF

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Publication number
EP2093173B1
EP2093173B1 EP08151610.6A EP08151610A EP2093173B1 EP 2093173 B1 EP2093173 B1 EP 2093173B1 EP 08151610 A EP08151610 A EP 08151610A EP 2093173 B1 EP2093173 B1 EP 2093173B1
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EP
European Patent Office
Prior art keywords
material web
sensor
plane
light
deviating
Prior art date
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Application number
EP08151610.6A
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German (de)
English (en)
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EP2093173A1 (fr
Inventor
Jürgen Eisen
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Texmag GmbH Vertriebsgesellschaft
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Texmag GmbH Vertriebsgesellschaft
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Priority to EP08151610.6A priority Critical patent/EP2093173B1/fr
Priority to US12/370,335 priority patent/US8476611B2/en
Priority to CN200910008008.1A priority patent/CN101556140B/zh
Publication of EP2093173A1 publication Critical patent/EP2093173A1/fr
Priority to US13/906,137 priority patent/US8729513B2/en
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Publication of EP2093173B1 publication Critical patent/EP2093173B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/0204—Sensing transverse register of web
    • B65H23/0216—Sensing transverse register of web with an element utilising photoelectric effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors
    • B65H2553/416—Array arrangement, i.e. row of emitters or detectors

Definitions

  • This document relates to apparatus and methods for detecting orientation features on a web
  • Web processing systems are used in the processing of web-shaped materials.
  • material webs can be fed from a winding of a machine, processed and subsequently rewound, whereby different position errors can occur.
  • appropriate regulatory devices may be used to regulate the lateral offset of a web of material.
  • FIG. 1A and FIG. 1B show such a regulation device in which the material web 100 of the width B undergoes a four times 90 ° deflection by means of a rotary frame system.
  • the material web is deflected via an inlet roller 101 and fed via an inlet length L 1 to a pivotable positioning frame 105 with two deflection rollers 102, 103. With the help of the pivotable positioning frame 105 can then bring about a lateral material web correction.
  • the material web is thereby pivoted about the pivot point 106 by an angle ⁇ .
  • the material web is then fed via an outlet length L 2 of an outlet roller 104.
  • a sensor device 170 may be arranged in the area of the outlet length L 2 . Due to the pivoting of the material web by an angle ⁇ , the material web in the region of the outlet length L 2 may have a corresponding deviation from a material web plane S provided.
  • an additional roller may be located in the region of the outlet length in order to correct the deviation and to keep the material web in the intended material web plane S in the further course of the outlet length.
  • a constant distance of the material web from the sensor can be maintained in the further course of the outlet length and it is possible to accurately measure the material web with conventional sensors.
  • the web can be warped or wrinkled by the backing roll.
  • the use of an additional roller can be costly.
  • US-A-5,354,992 discloses a system for generating a position correction error signal indicative of the lateral offset of the center of a strip from a centerline control position for a nearly flat strip having a width and first and second generally parallel edges as the generally flat strip moves along a particular feed line at a particular position
  • the error signal generating device including means for detecting the orthogonally projectable one-dimensional lateral position of the first edge of the moving strip at the determined position, means for detecting the orthogonally projectable one-dimensional lateral position of the second edge of the moving strip at the determined position
  • the system includes transducer means for detecting the lateral tilt angle of the strip at the determined position, means for generating an electrical value based on the detected tilt angle, means for generating edge signals indicative of the detected lateral positions of the edges of the web, and means responsive to the edge signals and the electrical value for providing an error signal responsive to the tendency to reduce the lateral offset of the web means from the central position for the web center.
  • the present invention relates to a device according to claim 1 and a method according to claim 13.
  • the dependent claims contain advantageous embodiments of the invention.
  • the device for detecting at least one orientation feature on a material web which extends in an intended material web direction in an intended material web direction comprises a sensor device which comprises a sensor element with at least one sensor line for detecting a sensor region on the material web.
  • the device further comprises at least one light emitter in order to generate at least two points of light on the material web for determining a position of a material web level deviating from the intended material web level.
  • the light transmitter is configured such that the at least two light points have a first distance on the material web extending in the intended material web plane.
  • the light emitter is designed such that the at least two points of light have a second distance on the material web running in the deviating material web plane.
  • the sensor device is designed such that the sensor element detects the first and the second distance for determining the position of the deviating material web plane.
  • the position of the deviating material web level can thus be determined in a simple and cost-saving manner, and a simple and accurate detection of the at least one orientation feature on the material web can be made possible.
  • the device may include one or more of the following features.
  • the material web level that deviates from the intended material web level may be a material web level that has been rotated about an axis extending in the material web direction.
  • the at least one light transmitter can be configured such that the at least two light spots in the sensor region lie on the material web.
  • the sensor device may be configured such that the sensor element detects the at least two light spots on the material web for determining the position of the deviating material web plane.
  • the light transmitter can furthermore be configured such that the at least two light spots on the material web are preferably on a line which runs perpendicular to the intended material web direction. configured such that the at least two points of light have a first distance on the material web extending in the intended material web plane.
  • the light emitter configured in such a way that the at least two light spots have a second distance on the material web extending in the deviating material web plane.
  • Sensor device designed in such a way
  • the device may comprise means for evaluating the difference between the first and the second distance for determining the position of the deviating material web level.
  • the light emitter can be designed in such a way that at least two light beams running parallel to one another are generated, which generate the at least two light spots on the material web.
  • the device may comprise at least two light transmitters arranged parallel to one another.
  • the device may comprise exactly one light transmitter and one beam splitter arrangement in order to generate the at least two light spots on the material web.
  • the beam splitter assembly may comprise a semitransparent element and a reflective element.
  • the Sensor device may be configured such that at least two sensor lines of the sensor element are at least partially read out in the material web direction in order to bring about an integration effect in the material web direction in the sensor region on the material web.
  • the sensor element can be arranged in a plane extending obliquely to the intended material web level.
  • the method comprises
  • Embodiments may provide any, all, or none of the following advantages.
  • the position of the deviating material web plane can be determined in a simple and cost-saving manner.
  • a simple and accurate detection of at least one orientation feature on the material web can be made possible.
  • At least one orientation feature can be used to determine a lateral deviation of the web from a designated position.
  • the at least one orientation feature may be, for example, a line or a pattern on the material web.
  • the orientation feature can run in the material web direction and may be near the edge of the web or the edge itself.
  • the sensor elements in this case may be optoelectronic sensors, such as color sensors or cameras.
  • FIG. 2A are material webs which have a line as an orientation feature shown.
  • a line 210 is scanned on a material web 200 in a sensor region 220.
  • FIG. 2A a) and c) are shown in each case continuous lines with uniform or disturbed background.
  • FIG. 2A b) and d) are each broken lines with a uniform or disturbed background to see. The device should be able to detect the orientation feature even with a disturbed background.
  • the at least one orientation feature can also be, for example, an edge of the material web or the like.
  • a material web 200 is shown whose edge 211 is scanned in a sensor region 221.
  • the orientation feature, the edge is thus detectable as a contrast difference by the sensor device.
  • the sensor device can detect brightness and / or color differences of the orientation feature. The contrast can then be calculated accordingly.
  • orientation features are shown as contrast differences.
  • each continuous contrast edges are shown with uniform or disturbed background.
  • interrupted contrast edges are seen with a uniform or disturbed background.
  • the sensor element may have the following configurations.
  • the sensor element may be, for example, a CCD sensor or CMOS sensor.
  • the sensor element may be a line sensor, such as a CCD line sensor.
  • the sensor element may also be a matrix sensor, such as a CCD matrix sensor or a CMOS matrix sensor.
  • the sensor element may be a black-and-white or gray-scale camera. Likewise, however, the sensor element can also be a color sensor which captures pixel by pixel with RGB evaluation. During each scan, the light is split into the primary colors red (R), green (G) and blue (B). Using an algorithm, the contrast differences can then be evaluated by a calculation unit, such as a processor, and a position of the orientation feature output. The contrast can also be calculated from the brightness differences as mentioned above.
  • FIG. 3 is a schematic sectional view of an apparatus for detecting at least one orientation feature 340 on a material web 300, which comprises a light emitter 330.
  • the device further comprises a sensor device 370, which comprises a sensor element with at least one sensor line, for detecting a sensor region 308 on the material web.
  • the material web 300 runs in an intended material web level in a designated material web direction (into or out of the drawing plane). If the material web is offset, the material web can run in a material web plane deviating from the intended material web level. In FIG. 3 the web is pivoted by the angle ⁇ about the pivot point 306.
  • the material web 300 'then runs in a deviating material web plane, which is a material web plane rotated about an axis extending in the material web direction, a material web plane rotated about an axis passing through the pivot point 306. Accordingly, a material web pivoted in the opposite direction as the material web 300 "in FIG. 3 shown.
  • the position of the orientation feature 340 within the sensor area 308 may be detected. If the material web is offset, for example as in FIG. 3 shown by the deviating material web 300 ', so the sensor area and the position of the orientation feature changes. This could lead to an error in the measurement of the position of the orientation feature 340.
  • the light emitter 330 generates a light beam 331 which generates two light spots 334, 335 on the material web 300.
  • the light spots 334, 335 lie in the sensor region 308 on the material web 300 and can be detected by the sensor device 370.
  • the two parallel light beams 332, 333 are aligned parallel and symmetrical to the main axis H of the objective of the sensor device 370.
  • the sensor device 370 can then detect the two light points 334', 335 'on the material web 300', whereby the two light points 334, 335 or 334 ', 335' lie. on the material web 300 or 300 'on a line which runs perpendicular to the intended material web direction, that is to say a line in the plane of the drawing in FIG FIG. 3 ,
  • the two light spots 334, 335 On the material web 300 extending in the intended material web plane, the two light spots 334, 335 have a first distance 338.
  • the two light spots 334', 335 ' have a second distance 338'.
  • the sensor element of the sensor device 370 can detect the first and the second distance. Furthermore, the difference between the first distance 338 and the second distance 338 'can then be evaluated to determine the position of the deviating material web level 300', for example by evaluation means which may be located in the sensor device or also outside thereof. These evaluation means can be used to generate a signal which indicates the position of the deviating material level.
  • the light emitter 330 emits the light beam 331, which is split by a beam splitter array 336, 337 into two parallel light beams 332 and 333.
  • the beam splitter assembly comprises the semitransparent element 336 and the reflective one Element 337.
  • This beam split into two parallel light beams can be made very accurately and inexpensively, with a high manufacturing accuracy must be achieved only in the beam splitter assembly.
  • the splitting of the light beam can also be generated by other means of beam splitting, such as a prism.
  • the device may comprise two light emitters arranged parallel to one another.
  • FIG. 4 is a three-dimensional view of a device for regulating the lateral offset of a web of material 400 with a device 440 for detecting at least one orientation feature on the web of material 400.
  • the web 400 undergoes a four times 90 ° deflection by the rollers 401, 402, 403 and 404.
  • pivotable positioning frame 405 can be a lateral material web correction cause.
  • the material web is pivoted about the pivot point 406 by a certain angle.
  • the material web is then fed via an outlet length of an outlet roller 404.
  • the device 440 is located on the material web 400 for detecting at least one orientation feature.
  • the at least one orientation feature in this case may be, for example, the material web edge 409 and / or a line located in the vicinity of the edge in the direction of the material direction A.
  • the detection of the at least one orientation feature takes place in the transmitted light method with the aid of a light source 480, which is arranged on a side of the material web 400 opposite the sensor device 470.
  • the device may also include more than one light source for different web surfaces. It should be understood that the device can also operate with reflected light or other suitable arrangements, but also no additional light source can be present.
  • the sensor device 470 detects the sensor region 408 on the material web 400 in order to detect the at least one orientation feature there. If the material web 400 is brought in the range of the outlet length by pivoting about a certain angle about the pivot point A from its intended material transport level in a different material web plane, the distance between the material web and the sensor element 470 is no longer constant. This deviating position of the material web can now be determined with the aid of the light transmitter 430.
  • the light transmitter 430 generates two parallel beams with the aid of the beam splitter arrangement 436, 437, which generate two points of light in the sensor area 408 on the material web 400.
  • the position of the deviating material web level can thus be determined in a simple and cost-saving manner, and a simple and accurate detection of the at least one orientation feature on the material web can be made possible.
  • the distance of the two light spots can be detected by the sensor device 470.
  • a corresponding signal can then be given by the sensor device 470 to the control device 450.
  • the control device can determine the lateral offset of the material web 400 and control the drive device 460 accordingly.
  • the light emitter 330 may be a monochromatic light source, in particular a laser. However, other suitable light emitters may be used. If a laser is sent, it can be switched. In this case, the sensor device may detect the sensor area at a first time the light transmitter is switched off and there are no light spots. At a second time, the sensor device may detect the sensor area when the light transmitter is turned on and the light spots are present in the sensor area. It is then possible to form the difference between the data records acquired at the first and at the second time. As a result, the recognizability of the light spots on the material web can be improved.
  • FIG. 5 is a schematic sectional view of at least part of a device for detecting an orientation feature 540 on a material web 500.
  • the sensor device 570 detects a sensor region 508 on the material web 500.
  • a light source (not shown) can be used to illuminate the material web.
  • the light rays incident on the sensor device 570 are focused by an optical element, a lens 572 disposed between the sensor element 571 and the material web 500, and hit the sensor element 571.
  • This optical element can also represent the objective.
  • the sensor element 571 is aligned straight, that is to say it is arranged in a plane extending parallel to the intended material web plane. It is also aligned vertically and symmetrically to the main axis of the lens.
  • the illustrated sensor element 571 comprises at least two sensor rows. It is therefore a matrix sensor element.
  • Sensor element 571 may in particular be a CMOS matrix sensor.
  • sensor device 570 At the in FIG. 5 shown sensor device 570 at least two sensor lines of the sensor element 571 in web direction A at least partially, but in particular completely, read out to effect in the sensor area 508 on the web 500 an integration effect in the web direction A. It can be read only a partial part of the sensor lines of the sensor element 571. A use of additional integration devices to widen the sensor area in web direction is thus not required.
  • the number and range of the sensor lines, the partial part of the sensor lines to be read out can be selected flexibly. In particular, can 1/10 or less of the sensor lines of the sensor element 571 are read out. If all sensor rows were read out for one scan, the sampling rate would be very low and the method would therefore be very slow.
  • the sensor element can be read out, for example, with a frequency between 50 and 1000 Hz, in particular approximately 200 Hz.
  • a CMOS matrix sensor with a pixel count of 2500x1950 is mentioned here by way of example. If a possible readout frequency is 200 Hz and a scan, ie an image, consists of 30 lines, the result is a sampling rate of 6 scans per second. The size of an image with about 30 sensor lines is on the order of only about one-tenth of the 2500 or 1950 sensor lines available.
  • the material web 500 can be offset by a displacement device in a deviating from the intended material web level material web level, as previously explained.
  • the device may also include a light emitter to create at least one spot of light on the web of material to determine a location of the deviant web level, as previously discussed.
  • the sensor lines of the sensor element 571 can then be read out in a sensor area 508 in the vicinity of the at least one light spot.
  • the imaging ratio of the sensor device 570 may be greater than 1: 2.
  • the relationship between the image width b and the object distance g is to be understood as the image ratio.
  • the image width here can be the distance between the sensor element 571 and the optical element 572.
  • the object width g may be the distance between the material web 500 and the optical element 572.
  • An imaging ratio greater than 1: 2 means that the object distance g is more than twice as large as the image width b. In particular, the imaging ratio may be in the range of 1: 4 to 1:10.
  • the device may further comprise a focusing element 573, which is arranged between the sensor element 571 and the material web 500.
  • the Focusing element may include, for example, a piezoelectric element.
  • the optical element 572 can be displaced in a direction parallel to the main axis of the objective, and thus effect a focusing by changing the image sharpness. The magnification is also changed.
  • the focusing element 573 can change the optical element, the lens 572, depending on the specific position of the deviating material web.
  • a light emitter (not shown) may be used to determine the position of the deviating web level as shown with reference to FIG. 3 and 4 explained. With the help of such a generated light spot or points of light on the web then autofocusing in dependence on the respective position of the deviating web level is possible.
  • FIG. 6 is a schematic sectional view of a device 670 for detecting at least one orientation feature 640 on a material web 600.
  • the sensor element 671 is arranged in a plane extending obliquely to the intended material web level, that is, it is arranged in a plane which forms an angle ⁇ not equal to zero to the intended material web level.
  • the sensor element 671 is not aligned in a plane perpendicular to the main axis of the objective. If the material web is moved through an offset device (as in FIG FIG. 1A and 1B shown) offset in a deviating from the intended material web level web surface, so a partial part of the sensor lines can be determined and read depending on the position of the deviating web level. In this way, autofocusing without the use of further focusing means is made possible.
  • a light transmitter can be used, as with reference to FIG FIG. 3 and 4 explained.
  • FIG. 3 to 6 the various with respect to FIG. 3 to 6 described aspects can be combined in any meaningful way.
  • the sensor element may be arranged in a plane extending obliquely to the intended material web level.

Landscapes

  • Length Measuring Devices By Optical Means (AREA)

Claims (13)

  1. Dispositif de détection d'au moins une caractéristique d'orientation (340) apportée sur une nappe de matière qui s'étend dans une direction prévue (A) pour la nappe de matière sur un plan (300) prévu pour la nappe de matière, le dispositif comportant :
    un dispositif de détection (370) qui comporte un élément de détection doté d'au moins une ligne de détection et qui détecte une zone de détection (308) sur la nappe de matière,
    caractérisé en ce que
    le dispositif comporte au moins un émetteur de lumière (330) qui forme au moins deux points lumineux (334, 335; 334', 335') sur la nappe de matière, en ce que l'émetteur de lumière (330) est configuré de telle sorte que les deux ou plusieurs points lumineux (334, 335; 334', 335') présentent une première distance (338) sur la nappe de matière (300) qui s'étend dans le plan prévu pour la nappe de matière et une deuxième distance (338') sur la nappe de matière (300') qui s'étend sur un autre plan de nappe de matière et
    en ce que le dispositif de détection (370) est configuré de telle sorte que l'élément de détection saisit la première et la deuxième distance (338, 338') pour déterminer la position d'un plan (300') de nappe de matière différent du plan (300) prévu pour la nappe de matière.
  2. Dispositif selon la revendication 1, dans lequel le plan (300') de nappe de matière différent du plan prévu pour la nappe de matière est un plan de nappe de matière qui a tourné par rapport à un axe qui s'étend dans la direction (A) de la nappe de matière.
  3. Dispositif selon les revendications 1 ou 2, dans lequel la ou les sources de lumière (330) sont configurées de telle sorte que les deux ou plusieurs points lumineux (334, 335; 334', 335') sont situés dans la zone de détection (308) prévue sur la nappe de matière.
  4. Dispositif selon l'une des revendications 1 à 3, dans lequel le dispositif de détection (370) est configuré de telle sorte que l'élément de détection saisit les deux ou plusieurs points lumineux (334, 335; 334', 335') sur la nappe de matière pour déterminer la position de l'autre plan (300') de la nappe de matière.
  5. Dispositif selon l'une des revendications précédentes, dans lequel l'émetteur de lumière (330) est configuré de telle sorte que les deux ou plusieurs points lumineux (334, 335; 334', 335') sont situés sur une ligne de la nappe de matière qui s'étend perpendiculairement à la direction (A) prévue pour la nappe de matière.
  6. Dispositif selon l'une des revendications précédentes, le dispositif présentant des moyens d'évaluation de la différence entre la première et la deuxième distance (338, 338') pour déterminer la position de l'autre plan (300') de la nappe de matière.
  7. Dispositif selon l'une des revendications précédentes, dans lequel l'émetteur de lumière (330) est configuré de manière à former au moins deux rayons lumineux (332, 333) qui s'étendent parallèlement l'un à l'autre et qui forment les deux ou plusieurs points lumineux (334, 335; 334', 335') sur la nappe de matière.
  8. Dispositif selon l'une des revendications précédentes, comportant au moins deux émetteurs de lumière disposés parallèlement l'un à l'autre.
  9. Dispositif selon l'une des revendications 1 à 7, qui comporte exactement un émetteur de lumière (330) et un ensemble (336, 337) de division de faisceau qui forme les deux ou plusieurs points lumineux (334, 335; 334', 335') sur la nappe de matière.
  10. Dispositif selon la revendication 9, dans lequel l'ensemble (336, 337) de division de faisceau comporte un élément semi-transparent (336) et un élément réfléchissant (337).
  11. Dispositif selon l'une des revendications précédentes, dans lequel le dispositif de détection (370) est configuré de manière à lire au moins en partie au moins deux lignes de détection de l'élément de détection dans la direction (A) de la nappe de matière pour réaliser un effet d'intégration dans la direction (A) de la nappe de matière dans la zone de détection (308) prévue sur la nappe de matière.
  12. Dispositif selon l'une des revendications précédentes, dans lequel l'élément de détection est disposé dans un plan qui s'étend obliquement par rapport au plan prévu pour la nappe de matière.
  13. Procédé de détection d'au moins une caractéristique d'orientation (340) sur une nappe de matière qui s'étend dans un plan (300) prévu pour la nappe de matière dans une direction (A) prévue pour la nappe de matière, le procédé comportant les étapes qui consistent à :
    faire saisir une plage de détection (308) sur la nappe de matière par un dispositif de détection (370) qui comporte un élément de détection qui présente au moins une ligne de détection,
    caractérisé par les étapes qui consistent à :
    faire former au moins deux points lumineux (334, 335; 334', 335') sur la nappe de matière par au moins un émetteur de lumière (330),
    déterminer à l'aide des deux ou plusieurs points lumineux (334, 335; 334', 335') la position d'un plan (300') de la nappe de matière différent du plan prévu pour la nappe de matière,
    les deux ou plusieurs points lumineux (334, 335) présentant une première distance (338) sur la nappe de matière (300) qui s'étend dans le plan prévu pour la nappe de matière et une deuxième distance (338') sur la nappe de matière (300') qui s'étend dans l'autre plan de la nappe de matière, l'élément de détection saisissant la première et la deuxième distance (338, 338') pour déterminer la position de l'autre plan (300') de la nappe de matière.
EP08151610.6A 2008-02-19 2008-02-19 Dispositif et procédé de détection de caractéristiques d'orientation sur une bande de matériau Active EP2093173B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP08151610.6A EP2093173B1 (fr) 2008-02-19 2008-02-19 Dispositif et procédé de détection de caractéristiques d'orientation sur une bande de matériau
US12/370,335 US8476611B2 (en) 2008-02-19 2009-02-12 Systems and methods for the detection of orientation features on a material web
CN200910008008.1A CN101556140B (zh) 2008-02-19 2009-02-19 用于检测材料片上定向特征的设备和工艺
US13/906,137 US8729513B2 (en) 2008-02-19 2013-05-30 Systems and methods for the detection of orientation features on a material web

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08151610.6A EP2093173B1 (fr) 2008-02-19 2008-02-19 Dispositif et procédé de détection de caractéristiques d'orientation sur une bande de matériau

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EP2093173A1 EP2093173A1 (fr) 2009-08-26
EP2093173B1 true EP2093173B1 (fr) 2013-06-12

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US (2) US8476611B2 (fr)
EP (1) EP2093173B1 (fr)
CN (1) CN101556140B (fr)

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US20090206284A1 (en) 2009-08-20
US20130270464A1 (en) 2013-10-17
CN101556140A (zh) 2009-10-14
US8729513B2 (en) 2014-05-20
EP2093173A1 (fr) 2009-08-26
US8476611B2 (en) 2013-07-02

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