EP0983853B1 - Dispositif automatique de détection de défauts d'impression par example sur des bandes métallisées - Google Patents
Dispositif automatique de détection de défauts d'impression par example sur des bandes métallisées Download PDFInfo
- Publication number
- EP0983853B1 EP0983853B1 EP99116453A EP99116453A EP0983853B1 EP 0983853 B1 EP0983853 B1 EP 0983853B1 EP 99116453 A EP99116453 A EP 99116453A EP 99116453 A EP99116453 A EP 99116453A EP 0983853 B1 EP0983853 B1 EP 0983853B1
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- European Patent Office
- Prior art keywords
- strip
- camera
- illumination
- flashlights
- semi
- 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.)
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
Definitions
- the subject of the present invention is a device making it possible to automatically detect, in a rotary printing machine, emerging printing defects on a metallized packaging tape, such as aluminized film or any other substrate with high power reflective.
- Such machines include several constituent stations namely, according to a logical development from upstream to downstream referring to the meaning of moving the tape, a feeding station comprising a reel holder and an automatic strip coupler followed by an strip required for each connection, an introduction station comprising a straightener and a tape guide, a series of one or more printing groups equipped with dryers, and finally a receiving station in reel or, as desired, a station directly inserting printed tape in a new machine allowing to cut it either by shaping rotary, either by flat shaping.
- the camera is advantageously placed along an axis of shooting oriented perpendicular to the plane of the metallized strip.
- the arrangement of a camera facing this strip will result in naturally generate the reflection of the camera image by the strip Metallic. If the camera can be mostly hidden behind a opaque cache, the objective of the latter will not, however, in any case be masked in a similar way.
- the geometric configuration of the lens of the camera with respect to the plane of the metallized strip is such that, given the specular properties of the tape, the camera can only mentallyly film the image of his own goal.
- the latter being directly connected to the room photographic of the camera, it follows that a black circle, more or less less well marked according to the quality of the reflection of the metallized strip, permanently appears in the center of the image given by the camera. So that the light rays reflected by the metallic strip pass through the lens of the camera according to such a configuration, it is necessary that these rays come from a light source arranged on the very axis of the lens of the camera under the law of reflection mentioning the equality between the angle of reflection and angle of incidence of a light ray.
- patent JP 9,300,596 describes a lighting device making it possible to inspect a strip of any substrate, and to detect the printing faults.
- the device in question consists of fixed lighting comprising three luminous tubes arranged facing the front of the moving strip vertically, and a light tube detecting the printing holes by back lighting of the strip.
- two of the three lamps are symmetrically arranged on either side of its normal and illuminate it under an angle of 55o from its surface. These two lamps provide a lighting intended to be reflected by all diffusing surfaces.
- the beam of light from the third lamp is intended to be reflected by specular surfaces. Its inclination from normal to the strip is 8o.
- the inclined plane defined by the lamp on the back is such that it includes the axis of the camera lens.
- the inventor proposes to replace the opaque bottom surface with a support made up of several layers of a material diffusing and reflecting the light by cascade from one layer to another. Thus is created, deep in each layer of this support, better light distribution in all directions helping to erase or soften the effect of the shadow unwanted.
- Patent JP 4,071,849 describes an optical detector designed for the inspection of printed tapes, including those comprising surfaces to be strong reflective power. Scrolling horizontally, the strip is lit obliquely on its front side by a light tube. The light reflected by the strip is returned towards a plurality of sensors arranged in line above the surface being examined. In front of each of these sensors is finds a polarizing dissector filter which extracts from the reflected beam by the strip, all the rays having undergone a specular reflection, that is to say all rays whose angle of incidence is equal to the angle of reflection. So, the auscultation of the patterns printed on the tape is only determined by the treatment of a beam of light entirely diffused by the surface thereof.
- JP patent 4,203,955 presents another variant allowing examine a print strip eliminating all disturbances given by unwanted specular reflections. This method is based on the conversion of an analog signal, proportional to the light intensity of light reflected by the strip, in a binary signal coding the portion image examined. Since the rays reflected as a result of a reflection specular have a higher luminosity than those which have been diffused by the strip, it is then possible to discern these last rays from the first in setting an intensity threshold limiting the analog signals received.
- Patent JP 3'255'346 solves, by auscultation of a band aluminized in this case consisting of a packaging for tablets pharmaceuticals, an optical problem in detecting sealing defects a metallic strip on circular cells containing pellets pharmaceuticals.
- the device in question has the particularity of being able to detect faults without being affected by the wave-like ripple the aluminized back of each of these tablet tablets, following the process normal manufacturing used. Scrolling horizontally, the aluminized back facing a projector obliquely illuminating this surface, the strip reflects the rays irregular intensity incidents depending on wave distribution that presents its surface.
- the image of the light intensity of such a surface omitted from any defect is previously memorized and taken as a model by a electronic controller.
- the purpose of the device according to the invention is to remedy these disadvantages by providing a fast and efficient tool in the detection of any kind of faults as well during the quality control referring to the production of bands predominantly specular colors that for those with matte prints. It goes without saying that this device also makes it possible to process mixed strips partly comprising metallic or highly reflective surfaces, and in part surfaces diffusing colors.
- One of the peculiarities of this device is to improve the visual aspect of the reflective surfaces filmed by a camera so on the one hand, these do not appear as areas black or heavily tarnished in which all defects cannot be made visible, and on the other hand so that all the diffusing surfaces, same dark, printed on an aluminized substrate could be perfectly distinguished on a video control screen.
- the device of this invention In particular allowing to control the texture of surfaces metallized thanks to the detection of defects up to a size less than 0.1 mm, depending on the characteristics of the camera, the device of this invention then has the advantage of being able to detect, by real-time, emerging faults on all reflective surfaces or diffusing when printing the tape. It is therefore possible to detect very early and automatically a printing defect which may take more or slower unacceptable dimensional proportions, and avoid thus a certain and significant waste of production.
- this device also allows good to detect frank and contrasting defects easily visible to the naked eye once identified, only significantly less marked defects, merging in their environment by a certain vagueness or camouflage conferred by little contrasting colors.
- the subject of the present invention is a device automatic printing defect detection suitable in particular for metallized strip control and in accordance with claim 1.
- Figure 1 provides a general view of the device 1 for detecting printing faults mounted in a box 2 serving as a dark room at device 1 and modular housing, all of which may constitute an option integrates easily with all printing machines.
- the box 2 is arranged facing the metallized strip 3, shown here in transparency. Leaving the last printing unit of the machine rotary printing, this strip runs on two rollers 4 and 5 arranged face to a large window 6 open in this box.
- the size of this window rectangular is such that its width is greater than the largest width of the strip, and its height is less than the center line of the two rollers 4 and 5 but at least equal to the maximum height of the format 7 of auscultation desired. The latter being illustrated in this figure by hatching.
- FIGS 2 and 3 show only the device 1 for detecting printing faults in perspective illustrations respectively of front and back.
- This device consists of a lighting member 10, at through which points the lens 56 of a video camera 55, and of an arm 30 the along which the camera and the lighting member can move.
- the lighting required to shoot each image in the strip consists of four flash lamps 11,12,13,14 among which are find two flashlights 11 and 13 with indirect lighting, and two flashlights 12, 14 directly illuminating the surface of the strip and whose light is mainly intended to be disseminated in all directions by strip 3 non-metallic surfaces.
- Each of these flashlights is provided with a reflector 15 of almost parabolic shape, the curvature of which allows to concentrate the lighting as much as possible on the area covered by the largest field of vision 7 of objective 56.
- a column 17, formed of a sheet slightly angled at its ends and reinforced laterally along its larger sides, is the main support of the whole lighting member 10.
- the two flash lamps 12 and 14 intended for direct lighting, but also two frames each formed of them of two trapezoidal metal plates 20 and 21 made integral of column 17 using the fixing screws 18. Between each of these pairs of plates 20 and 21, and at the end of them are the two flash lamps 11 and 13 necessary for indirect lighting. These can be adjusted, in a certain race, as much in their distance separating them from the column 17 only in their inclination thanks to an easily adjustable fixing method produced by a screw 22 and a groove 23 machined horizontally at the end of each of plates 20 and 21.
- the central part of the column 17 includes an opening 19 into which the lens 56 of the video camera 55 slides.
- This lens has a focal length which can be varied continuously and which remains the only editable setting on this camera.
- Attached to the front of this objective is a semi-transparent filter 57 inclined at 26o to the vertical plane towards the flash lamp 13 providing indirect lighting inferior.
- the value of the tilt angle of this semi-transparent filter can be changed in a range between 20o and 30o.
- an opaque diffuser 25 rectangular in shape concave, placed vertically opposite the metallic strip 3.
- a sleeve 26 enables the mechanical and optical link between the concave diffuser 25 and lens 56 of the camera.
- this sleeve allows on the one hand to contain the semi-transparent filter 57 so that the latter is never in front of the diffuser, and on the other hand this sleeve has a circular shape in its upper part while it is funnel-shaped in its part lower. Therefore, it constitutes an optimum and hermetic light pipe taking into account the inclined position of the semi-transparent filter.
- a flat diffuser translucent 27 is placed directly in front of the lower flash lamp 13.
- the camera 55 is rendered secured to the lighting member 10 by means of a flange 31, a plate of support 32 and a fixing plate 33.
- the flange 31 rigidly holds the camera 55 on the support plate 32.
- the latter is fixed perpendicular to the end of a fixing plate 33 which is itself screwed in the back of column 17 so that the axis 58 of the objective of the camera is confused with the axis of symmetry of the lighting member 10.
- a metal section of square section constitutes the body 34 of the arm 30 along from which the lighting member 10 and the camera 55 must be able to move in solidarity with the latter.
- a slider 35 in the shape of a claw slides freely on a profile rail 36 fixed horizontally, facing the lighting member 10, against the front external face of the body 34.
- the back of the slider 35 is screwed against the fixing plate 33 so that the whole of the lighting member 10 can slide along the rail 36.
- the movement of the lighting member is actuated by rotation a belt 37 pinched by a flange 38 integral with the fixing plate 33.
- the belt 37 is arranged parallel to the body 34 and rotates around two pulleys 39 integral with the vertical axes 40. These axes 40, maintained free to rotate at the ends of the arm 30, are arranged inside the body 34 so that part of each pulley 39 partially emerges from the body 34 by an opening cut in the front face thereof below of the rail 36.
- An electric motor 41 is fixed under the body 34, close to one of its ends.
- This motor 41 drives one of the two pulleys 39 by via a transmission box 42 making it possible to transpose, conventionally by meshing with various pinions, the movement of horizontal rotation of the motor shaft 41 in a vertical rotational movement driving the axis 40 of the pulley 39.
- the transmission box 42 is maintained by screws under the body 34 of the arm 30.
- the distribution of electrical energy to the entire device is provided by electrical cables housed in a channel 43, fixed on the face upper body 34, and via an articulated channel 44, folded over itself, which powers the camera 55 and the four flash lamps 11,12,13,14 by through the cables 24.
- the horizontal lower part of the articulated channel 44 is supported by a sheet 46 folded at right angles and fixed to the base of the rear face of the body 34.
- the upper end of the articulated channel 44 is itself supported by a smaller plate 47, folded "stepped", and fixed against the edge rear of the support plate 32.
- a supply box 45 Located on the same side as the motor 41 to the end of the rear face of the body 34, a supply box 45 ensures the connection to the electrical network.
- a stopper 48 provided with a rubberized head against which can come abut the side edge of the support plate 32.
- a sensor 49 makes it possible to detect, on the one hand and on the other hand, the end of the stroke of the mobile lighting member 10 along the arm 30. Connected with the motor 41, these sensors 49 make it possible to cut the supply of the latter each time that the lighting member 10 joins one or the other of the ends of the arm 30.
- a last sensor 50 Located between the sensors 49 at one of the ends of the arm 30, a last sensor 50 allows the device to locate the driver side on the opposite driver side, by displacement until the end of travel of the lighting member 10 in a phase initializing.
- Each end of the body 34 is pierced with two holes 51 in the front end face, and two holes 52 in the bottom face. These holes allowing the passage of two screws 53 intended for fixing the arm 30 on horizontal bars 67 or vertical bars 66 of the structure of the box 2, depending on the need for horizontal or vertical use of the camera 55.
- Figure 5 gives, in perspective, a view of the box 2 without the device 1 for detecting printing faults.
- this box is made up of various sheets forming its most long walls, among which there are four sheets 60 which are sheets fixed angles, and four other sheets that can be easily removed and which are a upper cover 61, lower cover 62, rear cover 63 and a vertical screen plate 64 placed at the front of the box.
- the side walls of the box 2 are formed by two lateral frames 65 of octagonal shape and between the sides of each of which are regularly arranged and fixed the vertical metal bars 66 welded and intersecting with the bars horizontal metal 67. Each of these bars being regularly pierced oblong holes for fixing the device 1 using the screws 53 of the arm 30.
- the two frames 65, the bars 66 and 67 as well as the four corner plates 60, constitute the rigid structure of the box 2.
- the wall side of the box is closed by a cover 68 with two doors sliding 69 sliding horizontally between two slides 70 screwed onto the cover 68.
- the sliding doors 69 are each fitted with a handle 71 and can be kept closed with a retractable hook 72 kept free to rotate at the end of one of the two handles 71.
- Others handles 73 equip the covers 61 and 68 as well as a cover 74, without door, intended to close the side wall of the box 2 on the opposite side driver.
- a small rectangular opening cut out in the angle sheet 60 and covered with a plate 75 allows the passage of cables required for power supply.
- the sheet metal screen 64 and the covers 61, 62, 63, 68 and 74 have a quick-closing system simple based on a quarter turn rotation of a plurality of locking screws 77.
- Figure 6 illustrates the nesting of three adjacent sheets forming the envelope of the casing 2, namely the fitting of the covers 61, 62 or 63 with the angle plates 60.
- the edges of the latter bent in an S shape or of Z, serve as supports for the edges bent towards the inside of the adjacent sheets. Seals 78, clipped onto the bent edges of the covers, allow ensure light tightness.
- the screen plate 64 is mounted at its ends on two supports 79 ( Figure 5) themselves fixed on the front vertical edges of the frames side 65.
- the arrangement of the screen sheet is such that the strip 3 passes in front of the window 6, between the device 10 and the sheet metal screen 64.
- the latter identical in size to that of window 6, can also be used as a cover which fits into the opening formed by the window 6 advantageously transforming the box into real trunk useful during its transport.
- a target 80 consisting of a precisely screened plate is screwed onto a target support 81.
- the latter consists of a sheet bent at right angles to its ends thus forming two legs equipped with two rectangular studs 82 rubber screwed on their outside face. Incised from a slit longitudinal and slid between the edges of the two fixed angle plates 60, the studs 82 maintain the target support 81 while allowing its positioning wherever the entire length of the window is 6. Tightening by screw of the slot of each of these studs allows to block the target support 81 at a chosen location.
- the device 1 for detecting printing faults is connected to two interconnected computers working simultaneously.
- One of the computers processes each image taken by the camera in a very short time of less than 300 ms, and the other pilot computer the movements of the lighting member, manages the lighting of the flash lamps and offers, via computer software, interaction possible at all times between the operator, the detection device and the management of this device.
- This diffuser will return this light in all directions while concentrating the lighting, thanks to its particular curvature, on the maximum format that it is possible to observe. It is in order to want to balance as well as possible the intensity and the distribution of the indirect lights ending on the strip metallic, that only a translucent flat diffuser was placed in front of the lighting lower indirect; since the beam of light emitted by homologous lighting superior already meets the concave diffuser before being reflected towards of the metallic strip.
- the opaque concave diffuser is covered with a layer of paint which on the one hand, thanks to its grainy consistency, allows good scattering of incident light, and which on the other hand, thanks to its very white color, absorbs only a minimum of light intensity. This paint also has the property of not turning yellow or tarnishing as it ages, and also provides an easily washable surface in the event of soiling any splashes.
- the camera lens allows you to take shots ranging up to a size close to the size of an A4 sheet. In case of strong enlargements of the image of the strip, it is necessary to bring an intensity more important light. This supply of light, controlled by the operator, is given by an increase in the lighting power of flash lamps independently adjustable according to their function.
- the principle of detection of defects notably uses the properties of a CCD camera which allows to obtain, from the metallized strip, an image consisting of a multitude of points called pixels. Each pixel has a certain transcribed brightness in a certain level of gray represented on a scale going from white to black and allowing to define the gradation of the contrast.
- the camera allows quantify the intensity of a color by decomposing it in three primary colors, and to interpret this intensity in the scale of shades of grey.
- the detection of a fault is made by comparing the level of gray of a pixel of a strip image with the gray level of the same pixel of another image memorized and having to be a priori identical to the first.
- a certain tolerance defined by the operator, is applied to the variation of the gray level observed between the two images for the same pixel. This tolerance allows to take into account in particular normal variations permissible to anchor the tape so as not to interpret them as being the finding of a defect.
- Three different faults can be detected during auscultation of a flat band. It may be a registry fault along the axis of abscissa X parallel to the width of the strip, of a following register defect the Y axis perpendicular to the X axis or a quality defect independent printing of the two previous faults.
- a registry fault along the axis of abscissa X parallel to the width of the strip of a following register defect the Y axis perpendicular to the X axis or a quality defect independent printing of the two previous faults.
- the operator With the help of the software controlling the detection device, the operator will be able to view on the control screen a second image in front theoretically be identical to the first reference image. Due to sensitivity of the device, certain "faults" or more precisely, certain differences in contrast level of a few pixels compared to the first reference image, will be identified and marked as such by the computer of control. The operator will have the choice of accepting or refusing the quality presented by this second image. In the event that the operator considers that the image in question reveals defects such that it is not representative of a model image, it will refuse this image and a new image will be presented to him. Otherwise the print quality is considered good, the image in question will be memorized by the computer and averaged at the first.
- This standard image will constitute the new reference image that will serve as a basis for comparison throughout automated control of the metallic strip.
- a certain tolerance, defined by the operator, is then applied during the gray level control between this new reference image and the images to come to be checked.
- Automation of the control process is based on input a number of samples of tape images taken according to a operator-defined sequence.
- the chosen control sequence examines as quickly as possible the entire width of the bandaged. The operator is however free to order or change at any time moment, fixedly or temporarily, the control sequence.
- the camera will stop at the abscissa of the fault detected so as to check whether there is repetition of this defect, at this same abscissa, in the few directly successive impressions. If so, the controller will conclude that an emerging fault may worsen, and will immediately warn the operator.
- the metallized strip may include both one print on the front and one print on the back. In such cases, it is necessary that the prints on the front and back are perfectly in register so as to eliminate any discrepancy rendering the final product unusable.
- the placement of a second box facing the first, and equipped with the same auscultating device on the back of the metallic strip, may be an option to the device which is the subject of the present invention request.
- the arrangement such an option has the advantage of being able to have a multitude of different lighting combinations from each other, while providing, specifically according to the type of tape used, the best examples of quality in terms of color rendering sought.
- the use of a single lighting device for auscultation of transparent stripes generates, however, on the screen sheet placed at the rear of the strip, a problem of projection of shadows cast by the printed patterns. This problem is a consequence of the combination of non-illuminated perpendicular to the printed patterns, with the distance separating the screen sheet from the transparent strip. From this drawback results, on the control screen, a multiple visualization of the band patterns.
- the device of the present invention can be fitted, in place of the screen plate, with a perfectly luminous surface diffuse and homogeneous over its entire height and throughout its length. This light surface is powered by a flash lamp operating in synchronism with the flash lamps of said device.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Description
- un manque de rendu et de fidélité des couleurs spéculaires et diffusantes pour une comparaison objective,
- la certitude, dans la totalité des dispositifs ne différentiant pas l'éclairage des surfaces diffusantes de celui des surfaces spéculaires, de devoir faire face, entre ces deux types de surfaces, à un déséquilibre de luminosité entraínant une surintensité des couleurs métallisées au détriment du contraste des couleurs diffusantes,
- l'emploi d'un éclairage oblique, pour l'auscultation des surfaces réfléchissantes, impliquant de ce fait un double inconvénient à savoir : une étendue fortement réduite du champ de vision de la caméra vu la finesse du pinceau lumineux pouvant traverser l'objectif après réflexion spéculaire, et une déformation de l'image donnée par la caméra vu l'obliquité de son axe de prise de vue par rapport à la normale à la surface auscultée,
- l'impossibilité fondamentale, vu l'objectif visé par l'objet de la présente invention, de pouvoir accéder à un processus visant à supprimer tous les faisceaux directement réfléchis par la surface examinée et n'ayant subit aucune diffusion par celle-ci,
- l'inefficacité de certains dispositifs face au traitement de bandes transparentes ou translucides bien que comprenant des surfaces métallisées,
- l'utilisation d'un procédé de détection mal ou non adapté à la détection de défauts d'impression recherchés sur des bandes métallisées planes et diversement colorées, ne présentant aucune ondulation particulière.
- la figure 1 représente une vue en perspective du dispositif de détection des défauts d'impression agencé dans un caisson placé en face de la bande à ausculter,
- les figures 2 et 3 illustrent le dispositif de détection sorti de son caisson selon des vues en perspectives respectivement prises de face et de dos,
- la figure 4 montre le dispositif de détection, sorti de son caisson, dans une vue de profil vue de l'extrémité côté opposé conducteur,
- la figure 5 représente, dans une vue en perspective, le caisson sans le dispositif de détection des défauts d'impression,
- la figure 6 représente, en plan, une coupe partielle de l'assemblage de trois tôles adjacentes formant l'enveloppe du caisson.
Claims (10)
- Dispositif automatique (1) détectant les défauts d'impression apparaissant sur des bandes métallisées (3) ou sur tout autre support d'impression comprenant une prédominance de surfaces de couleurs spéculaires, caractérisé en ce que ledit dispositif, agencé dans un caisson (2) d'obscurcissement, comprend un bras (30) sur lequel peut se déplacer automatiquement un membre d'éclairage (10) muni d'une caméra vidéo (55) d'objectif (56) à focale variable filmant en continu, au travers d'un filtre semi-transparent (57) placé dans une position oblique au devant de ce dernier, une portion de la bande (3) d'un format (7) de taille variable, et en ce que l'éclairage de cette portion de bande est assuré par deux lampes-flash (12, 14) d'éclairage direct, principalement prévues pour l'illumination des surfaces non spéculaires de la bande, et par deux autres lampes-flash (11, 13) d'éclairage indirect, avantageusement prévues pour l'illumination des surfaces de couleurs spéculaires, et parmi lesquelles l'une des deux lampes-flash (11, 13) d'éclairage indirect comprend un diffuseur plan translucide (27) disposé sur sa face frontale avant et est préférentiellement orientée en direction du filtre semi-transparent (57), alors que l'autre lampe-flash (11) est orientée en direction de la surface d'un diffuseur concave et opaque (25), englobant le filtre semi-transparent (57), et qui est monté en son centre sur un manchon (26) qui réalise le lien mécanique et optique entre le diffuseur (25) et l'objectif (56) de la caméra (55).
- Dispositif selon la revendication 1, caractérisé en ce que le membre d'éclairage (10) a pour partie centrale une colonne (17) percée d'une ouverture (19) dans laquelle vient se glisser l'objectif (56) d'axe (58) de la caméra vidéo (55), aux extrémités de ladite colonne (17) se trouvent fixées les deux lampes flash (12, 14) d'éclairage direct et sur les flancs latéraux de chacune desquelles sont vissées, en avant de la colonne (17), une paire de plaques (20, 21) formant les branches d'une monture pour chacune des lampes-flash (11, 13) d'éclairage indirect qui y sont fixées en leurs extrémités par un dispositif de fixation simple et réglable constitué d'une vis (22) traversant une rainure (23) taillée dans chacune des plaques (20, 21) de manière à ce que chacune des lampes-flash (11 et 13) d'éclairage indirect puisse être finement ajustée à la fois le long de sa monture et dans son inclinaison, et en ce que chacune des lampes-flash (11,12, 13,14) est équipée d'un réflecteur (15) de forme quasi parabolique, et produise des éclairs dont la cadence est en synchronisme avec la fréquence de défilement des motifs imprimés sur la bande à ausculter.
- Dispositif selon la revendication 1, caractérisé en ce que le diffuseur opaque (25) possède une forme concave ayant une courbure permettant de diffuser et de renvoyer les rayons issus des deux lampes-flash (11, 13) d'éclairage indirect en concentrant au maximum cet éclairage sur la zone couverte par le plus grand champ de vision (7) que peut fournir l'objectif (56), ledit diffuseur (25) est recouvert d'une couche de peinture qui d'une part, grâce à sa consistance granuleuse, permet une bonne diffusion de la lumière incidente, et qui d'autre part, grâce à sa couleur très blanche, n'absorbe qu'un minimum d'intensité lumineuse, ce revêtement possède également les propriétés de ne pas jaunir ou se ternir en vieillissant et constitue une surface facilement lavable, ledit diffuseur (25) comprend dans sa partie centrale une ouverture acceptant le manchon (26) permettant de contenir le filtre semi-transparent (57) de manière à ce que ce dernier ne se trouve jamais en avant du diffuseur, et en ce que ledit manchon (26) présente à l'une de ces extrémités une forme circulaire dans sa moitié supérieure et une forme d'entonnoir dans sa moitié inférieure de manière à tenir compte au mieux de l'incidence et de la fonction de chacun des faisceaux de lumière issus des deux lampes-flash (11, 13) d'éclairage indirect compte tenu de la position inclinée occupée par le filtre semi-transparent (57) dans le manchon (26).
- Dispositif selon la revendication 1, caractérisé en ce que le filtre semi-transparent (57) a la particularité d'être à la fois translucide pour une proportion majoritaire de rayon lumineux, et de réfléchir la proportion minoritaire quel que soit l'angle d'incidence sous lequel le faisceau en question frappe sa surface inclinée en direction de la lampe-flash (13) d'éclairage indirect d'un angle de 26º par rapport au plan de l'objectif de la caméra de manière à ce que le faisceau de lumière émis par cette dernière vienne frapper le filtre semi-transparent (57) qui, en partie, le renverra en direction de la bande (3) avant que la surface brillante de la bande (3) le réfléchisse dans une direction telle que cette dernière réflexion spéculaire puisse traverser en majeure partie le filtre semi-transparent (57) et atteindre l'objectif (56) de la caméra (55), et en ce que la valeur de l'angle d'inclinaison dudit filtre semi-transparent (57) peut être réglée dans une plage variant entre 20º et 30º par un mécanisme simple pouvant être automatisé.
- Dispositif selon la revendication 2, caractérisé en ce que la colonne (17) est également équipée d'une plaque de fixation (33), vissée dans le dos de cette colonne au-dessous de l'axe (58) définissant également son plan médian, laquelle maintient une plaque de support (32), vissée perpendiculairement à l'une de ses extrémités, cette dernière plaque (32) supportant à son tour la caméra (55) maintenue rigidement à l'aide d'une bride de fixation (31), ainsi qu'une petite tôle (47), pliée "en escalier", fixée contre le bord arrière de la plaque (32) et servant de support à la partie supérieure d'un canal articulé (44) replié sur lui-même, et en ce que sur ladite plaque de fixation (33) se trouve également fixés d'une part, un glisseur (35) en forme de griffe, et d'autre part une bride (38) vissée au-dessous de ce dernier.
- Dispositif selon la revendication 1, caractérisé en ce que le bras (30) est formé d'un corps (34) constitué par un profilé métallique de section carrée comprenant d'une part, dans ses extrémités, deux trous (51) et deux trous (52) respectivement percés dans sa face frontale et dans sa face inférieure pour y permettre le passage de deux vis (53) destinées à la fixation du bras (30) sur des barres horizontales (67) ou verticales (66) de la structure du caisson (2), et comprenant d'autre part un rail profilé (36) fixé horizontalement sur sa face frontale et le long duquel le glisseur (35) peut librement coulisser, et en ce que sur la face arrière de ce corps (34) se trouve fixée une tôle (46) pliée à angle droit afin de soutenir la partie inférieure d'un canal articulé (44), et à l'intérieur de ce corps (34) se trouvent deux axes (40) maintenus libres en rotation et disposés dans ses extrémités, parallèlement à la face frontale du corps (34) située en vis-à-vis de la plaque de fixation (33), de manière à ce qu'une partie de deux poulies (39), chacune solidaire d'un des axes (40) nécessaire au déplacement linéaire du membre d'éclairage (10), émerge partiellement du corps (34) par une ouverture taillée dans ladite face frontale de celui-ci en dessous du rail (36).
- Dispositif selon la revendication 6, caractérisé en ce que le déplacement linéaire du membre d'éclairage (10) le long du bras (30) est assuré, grâce à la fixation d'une bride (38) sur une courroie (37), par la rotation de cette dernière cheminant autour des deux poulies (39) à la fois à l'intérieur et à l'extérieur du corps (34) le long de la face frontale de celui-ci, et en ce que seul l'un des deux axes (40) est entraíné en rotation par l'intermédiaire d'une boíte de transmission (42) maintenue sous le corps (34) et permettant de transposer, conventionnellement par engrènement de divers pignons, le mouvement de rotation de l'arbre d'un moteur (41), également fixé sous le corps (34), en un mouvement de rotation perpendiculaire entraínant l'axe (40) en question, et en ce que le corps (34) du bras (30) comprend à chacune de ces extrémités une butée d'arrêt (48) au devant de laquelle est positionné un capteur de fin de course (49) et à côté duquel, pour l'une des deux extrémités seulement, se trouve encore fixé un capteur de direction (50) détectant le sens du déplacement du membre d'éclairage (10), et en ce que l'alimentation en énergie des divers composants électriques se fait par des câbles (24) logés dans un canal (43) fixé le long du corps (34), et dans le canal articulé (44) capable de suivre les mouvements linéaires du membre d'éclairage (10).
- Dispositif selon la revendication 1, caractérisé en ce que le caisson (2), de forme prismatique droite à base octogonale, est constitué d'une structure comprenant d'une part pour faces latérales deux cadres (65) entre les bords de chacun desquels sont régulièrement disposées et fixées les barres métalliques verticales (66) soudées et s'entrecroisant avec les barres métalliques horizontales (67) chacune percée d'une pluralité de trous oblongs régulièrement espacés, et d'autre part comprenant pour arrêtes reliant les deux cadres latéraux (65) dudit caisson (2), quatre tôles d'angle (60) pliées à 45º le long de leurs plus longs côtés dans le but de constituer un rebord de rigidité lui-même comprenant une gouttière dans laquelle repose les bords longitudinaux, repliés et terminés d'un joint (78), de chacun des couvercles (61, 62, 63), constituant l'enveloppe dudit caisson (2), et en ce que l'une des tôles (60) comprend une petite ouverture refermée par une plaque (75) destinée au passage des câbles (24) nécessaires à l'alimentation du dispositif (1) en énergie électrique.
- Dispositif selon la revendication 8, caractérisé en ce que quatre anneaux de levage (76) sont boulonnés sur les flancs supérieurs des cadres latéraux (65) dont l'un de ces cadres est recouvert d'un couvercle (74) démuni de portes, et l'autre, opposé au premier, est recouvert d'un couvercle (68) comprenant deux portes coulissantes (69), glissant horizontalement entre deux glissières (70) vissées sur le couvercle (68), équipée chacune d'une poignée (71) et pouvant être tenue fermée grâce à un crochet escamotable (72) maintenu libre en rotation à l'extrémité de l'une des deux poignées (71), et en ce que d'autres poignées (73) équipent certains (61,68,79) des couvercles (61, 62, 63, 68, 74).
- Dispositif selon la revendication 8, caractérisé en ce qu'à l'opposé de l'un (63) des couvercles (61, 62, 63) constituant l'enveloppe du caisson (2) se trouve une large ouverture (6), formée par le retrait d'une tôle-écran (64) identique audit couvercle (63), et au travers de laquelle pointe l'objectif (56) de la caméra (55) visionnant la bande (3) qui défile à l'extérieur du caisson (2) sur deux rouleaux (4, 5) disposés face à ladite fenêtre (6) entre les bords longitudinaux de laquelle s'y trouvent glissés deux plots en caoutchouc (82) vissés sur chacune des deux pattes pliées à angle droit d'une tôle rectangulaire étroite (81) servant de support à une cible (80) constituée d'une plaque tramée avec précision, et en ce que la tôle-écran (64) est maintenue, en avant de la fenêtre (6) derrière la bande (3), par ses extrémités sur deux supports (79) fixés sur les bords verticaux frontaux des cadres latéraux (65), ladite tôle-écran (64) ainsi que lesdits couvercles (61, 62, 63, 68, 74) sont tous dotés d'un système à fermeture rapide simple basé sur la rotation d'un quart de tour d'une pluralité de vis de blocage (77).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01788/98A CH692847A5 (fr) | 1998-09-02 | 1998-09-02 | Dispositif automatique détectant les défauts d'impression apparaissant sur des bandes métallisées ou sur tout autre support d'impression comprenant une prédominance de surfaces de couleurs s |
CH178898 | 1998-09-02 |
Publications (2)
Publication Number | Publication Date |
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EP0983853A1 EP0983853A1 (fr) | 2000-03-08 |
EP0983853B1 true EP0983853B1 (fr) | 2003-05-02 |
Family
ID=4218621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP99116453A Expired - Lifetime EP0983853B1 (fr) | 1998-09-02 | 1999-08-21 | Dispositif automatique de détection de défauts d'impression par example sur des bandes métallisées |
Country Status (7)
Country | Link |
---|---|
US (1) | US6496219B1 (fr) |
EP (1) | EP0983853B1 (fr) |
JP (1) | JP3203237B2 (fr) |
CA (1) | CA2280522C (fr) |
CH (1) | CH692847A5 (fr) |
DE (1) | DE69907344T2 (fr) |
ES (1) | ES2199508T3 (fr) |
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US10642551B2 (en) | 2017-07-14 | 2020-05-05 | Georgia-Pacific Corrugated Llc | Engine for generating control plans for digital pre-print paper, sheet, and box manufacturing systems |
US11449290B2 (en) | 2017-07-14 | 2022-09-20 | Georgia-Pacific Corrugated Llc | Control plan for paper, sheet, and box manufacturing systems |
US11485101B2 (en) | 2017-07-14 | 2022-11-01 | Georgia-Pacific Corrugated Llc | Controls for paper, sheet, and box manufacturing systems |
US11520544B2 (en) | 2017-07-14 | 2022-12-06 | Georgia-Pacific Corrugated Llc | Waste determination for generating control plans for digital pre-print paper, sheet, and box manufacturing systems |
US11807480B2 (en) | 2017-07-14 | 2023-11-07 | Georgia-Pacific Corrugated Llc | Reel editor for pre-print paper, sheet, and box manufacturing systems |
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FI115859B (fi) * | 2002-08-08 | 2005-07-29 | Metso Automation Oy | Menetelmä ja järjestely epäpuhtauksien mittaamiseksi |
DE10319771B4 (de) * | 2003-05-02 | 2005-03-17 | Koenig & Bauer Ag | System zur Inspektion eines Druckbildes |
DE102007025910B4 (de) * | 2007-06-01 | 2013-08-29 | Windmöller & Hölscher Kg | Hintergrundbeleuchtung |
DE102008057891A1 (de) * | 2008-11-18 | 2010-05-20 | Bst International Gmbh | Verfahren und Vorrichtung zum Überprüfen eines Druckbildes auf einer laufenden Materialbahn |
CN103344563B (zh) * | 2013-06-07 | 2015-07-29 | 上海大学 | 一种自适应调色调光机器视觉光源检测装置及方法 |
US20170082554A1 (en) * | 2015-09-17 | 2017-03-23 | Ford Global Technologies, Llc | High speed, flexible pretreatment process measurement scanner |
US20190238796A1 (en) | 2017-05-11 | 2019-08-01 | Jacob Nathaniel Allen | Object Inspection System And Method For Inspecting An Object |
CN109100361A (zh) * | 2018-09-05 | 2018-12-28 | 深圳市盛世智能装备有限公司 | 一种工件缺陷检测设备 |
CA3182914A1 (fr) | 2020-06-17 | 2021-12-23 | Andrew Gary Gagne | Systeme et procede de reparation de defaut |
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US4003660A (en) * | 1975-12-03 | 1977-01-18 | Hunter Associates Laboratory, Inc. | Sensing head assembly for multi-color printing press on-line densitometer |
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FR2726299A1 (fr) * | 1994-11-02 | 1996-05-03 | Scanera Sc | Dispositif d'inspection de textiles |
IT1273968B (it) * | 1995-02-24 | 1997-07-11 | Finmeccanica Spa | Apparecchiatura per il rilevamento ottico di difetti superficiali in particolare per nastri laminati |
US5717456A (en) * | 1995-03-06 | 1998-02-10 | Champion International Corporation | System for monitoring a continuous manufacturing process |
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-
1998
- 1998-09-02 CH CH01788/98A patent/CH692847A5/fr not_active IP Right Cessation
-
1999
- 1999-08-19 CA CA002280522A patent/CA2280522C/fr not_active Expired - Fee Related
- 1999-08-21 ES ES99116453T patent/ES2199508T3/es not_active Expired - Lifetime
- 1999-08-21 DE DE69907344T patent/DE69907344T2/de not_active Expired - Fee Related
- 1999-08-21 EP EP99116453A patent/EP0983853B1/fr not_active Expired - Lifetime
- 1999-09-02 JP JP24889299A patent/JP3203237B2/ja not_active Expired - Fee Related
- 1999-09-02 US US09/388,985 patent/US6496219B1/en not_active Expired - Fee Related
Cited By (8)
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US10642551B2 (en) | 2017-07-14 | 2020-05-05 | Georgia-Pacific Corrugated Llc | Engine for generating control plans for digital pre-print paper, sheet, and box manufacturing systems |
US11093186B2 (en) | 2017-07-14 | 2021-08-17 | Georgia-Pacific Corrugated Llc | Engine for generating control plans for digital pre-print paper, sheet, and box manufacturing systems |
US11449290B2 (en) | 2017-07-14 | 2022-09-20 | Georgia-Pacific Corrugated Llc | Control plan for paper, sheet, and box manufacturing systems |
US11485101B2 (en) | 2017-07-14 | 2022-11-01 | Georgia-Pacific Corrugated Llc | Controls for paper, sheet, and box manufacturing systems |
US11520544B2 (en) | 2017-07-14 | 2022-12-06 | Georgia-Pacific Corrugated Llc | Waste determination for generating control plans for digital pre-print paper, sheet, and box manufacturing systems |
US11807480B2 (en) | 2017-07-14 | 2023-11-07 | Georgia-Pacific Corrugated Llc | Reel editor for pre-print paper, sheet, and box manufacturing systems |
US11907595B2 (en) | 2017-07-14 | 2024-02-20 | Georgia-Pacific Corrugated Llc | Control plan for paper, sheet, and box manufacturing systems |
US11911992B2 (en) | 2017-07-14 | 2024-02-27 | Georgia-Pacific Corrugated Llc | Controls for paper, sheet, and box manufacturing systems |
Also Published As
Publication number | Publication date |
---|---|
JP2000074843A (ja) | 2000-03-14 |
EP0983853A1 (fr) | 2000-03-08 |
CA2280522C (fr) | 2003-01-28 |
DE69907344T2 (de) | 2004-03-25 |
US6496219B1 (en) | 2002-12-17 |
DE69907344D1 (de) | 2003-06-05 |
ES2199508T3 (es) | 2004-02-16 |
JP3203237B2 (ja) | 2001-08-27 |
CA2280522A1 (fr) | 2000-03-02 |
CH692847A5 (fr) | 2002-11-29 |
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