EP0983853B1 - Automatische Einrichtung zum Nachweis von Druckfehlern zum Beispiel auf metallisiertes Bahnmaterial - Google Patents

Automatische Einrichtung zum Nachweis von Druckfehlern zum Beispiel auf metallisiertes Bahnmaterial Download PDF

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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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EP
European Patent Office
Prior art keywords
strip
camera
illumination
flashlights
semi
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EP99116453A
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English (en)
French (fr)
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EP0983853A1 (de
Inventor
Olivier Porret
Claude Toma
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Bobst Mex SA
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Bobst SA
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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)

Claims (10)

  1. Automatische Vorrichtung (1), welche Druckfehler erkennt, die auf metallisierten Streifen (3) oder auf jedem anderen Druckträger erscheinen, bei dem Flächen mit spiegelnden Farben vorherrschen, dadurch gekennzeichnet, dass die Vorrichtung, die in einem Gehäuse (2) zur Verdunklung angeordnet ist, einen Arm (30) umfasst, an dem sich ein Beleuchtungselement (10) automatisch bewegen kann, welches mit einer Videokamera (55) mit einem Objektiv (56) mit variabler Brennweite versehen ist, das durch einen in einer schrägen Position vor dem Objektiv angebrachten semi-transparenten Filter (57) kontinuierlich einen Teil des Streifens (3) eines Formats (7) von unterschiedlicher Grösse aufnimmt, und dadurch, dass die Beleuchtung dieses Streifenteils durch zwei Blitzlampen (12, 14) zur direkten Beleuchtung gewährleistet ist, die vorwiegend für die Beleuchtung von nicht spiegelnden Flächen des Streifens vorgesehen sind, und durch zwei weitere Blitzlampen (11, 13) zur indirekten Beleuchtung, die vorzugsweise zur Beleuchtung der Flächen mit spiegelnden Farben vorgesehen sind, und wobei eine der zwei Blitzlampen (11, 13) zur indirekten Beleuchtung einen an ihrer vorderen Stirnseite angebrachten planen, lichtdurchlässigen Diffusor (27) umfasst und vorzugsweise in Richtung des semi-transparenten Filters (57) orientiert ist, wohingegen die andere Blitzlampe (11) in Richtung der Fläche eines konkaven und opaken Diffusors (25) orientiert ist, den semi-transparenten Filter (57) umfassend, und in ihrer Mitte an einer Muffe (26) angebracht ist, welche die mechanische und die optische Verbindung zwischen dem Diffusor (25) und dem Objektiv (56) der Kamera (55) herstellt.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Beleuchtungselement (10) als Mittelteil eine Säule (17) aufweist, durch welche hindurch eine Öffnung (19) vorgesehen ist, in die das Objektiv (56) der Achse (58) der Videokamera (55) gleitet, wobei an den Enden der Säule (17) die zwei Blitzlampen (12, 14) zur direkten Beleuchtung befestigt sind und an deren Seitenflächen jeweils vor der Säule (17) ein Paar Platten (20, 21) angeschraubt ist, die die Schenkel einer Anbringungsvorrichtung für jede der Blitzlampen (11, 13) zur indirekten Beleuchtung bilden, die dort an ihren Enden durch eine einfache und regulierbare Befestigungsvorrichtung befestigt sind, welche aus einer Schraube (22) gebildet ist, die sich durch einen in jede der Platten (20, 21) geschnittenen Schlitz (23) erstreckt, so dass jede der Blitzlampen (11, 13) zur indirekten Beleuchtung fein eingestellt werden kann, sowohl entlang ihrer Befestigungsvorrichtung als auch in ihrem Winkel, und dadurch, dass jede der Blitzlampen (11, 12, 13, 14) mit einem Reflektor (15) mit im Wesentlichen parabolischer Form versehen ist und Blitze erzeugt, deren zeitliche Abfolge mit der Bewegungsfrequenz der auf den zu untersuchenden Streifen gedruckten Motive synchronisiert ist.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der opake Diffusor (25) eine konkave Form besitzt, die eine Krümmung aufweist, welche es ermöglicht, die von den zwei Blitzlampen (11, 13) zur indirekten Beleuchtung stammenden Strahlen zu streuen und zurückzusenden, wobei diese Beleuchtung in höchstmöglichem Masse auf den Bereich konzentriert wird, der von dem grössten Sehfeld (7) erfasst ist, das das Objektiv (56) liefern kann, wobei der Diffusor (25) von einer Farbschicht bedeckt ist, die einerseits dank ihrer körnigen Konsistenz eine gute Streuung des einfallenden Lichts ermöglicht, und die andererseits dank ihrer sehr weissen Farbe nur ein Minimum der Lichtintensität absorbiert, wobei diese Farbe darüber hinaus die Eigenschaft besitzt, nicht zu vergilben oder bei der Alterung matt zu werden, und auch eine leicht abwaschbare Fläche darstellt, der Diffusor (25) in seinem Mittelteil eine Öffnung umfasst, die die Muffe (26) aufnimmt und ermöglicht, den semi-transparenten Filter (57) derart zu enthalten, dass sich letzterer niemals vor dem Diffusor befindet, und dadurch, dass die Muffe (26) an einem ihrer Enden an ihrer oberen Hälfte eine runde Form aufweist und an ihrer unteren Hälfte eine Trichterform aufweist, um in optimaler Weise den Einfall und die Funktion aller der von den zwei Blitzlampen (11, 13) zur indirekten Beleuchtung stammenden Lichtstrahlen unter Berücksichtigung der von dem semi-transparenten Filter (57) eingenommenen geneigten Position in der Muffe (26) zu berücksichtigen.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der semi-transparente Filter (57) die Besonderheit aufweist, gleichzeitig für den grösseren Anteil von Leuchtstrahlen durchscheinend zu sein und den kleineren Anteil zu reflektieren, unabhängig von dem Einfallwinkel mit dem der betreffende Lichtstrahl auf seine in Richtung der Blitzlampe (13) zur indirekten Beleuchtung in einem Winkel von 26° bezüglich der Ebene des Kameraobjektivs geneigte Fläche trifft, so dass der von letzterer gesendete Lichtstrahl auf den semi-transparenten Filter (57) trifft, der ihn teilweise in Richtung des Streifens (3) zurücksendet, bevor die glänzende Fläche des Streifens (3) ihn derart in eine Richtung reflektiert, dass diese letztere spiegelnde Reflexion grösstenteils den semi-transparenten Filter (57) durchquert und das Objektiv (56) der Kamera (55) erreichen kann, und dadurch, dass der Wert des Neigungswinkels des semi-transparenten Filters (57) durch einen einfachen Mechanismus, welcher automatisiert werden kann, in einem Bereich zwischen 20° und 30° eingestellt werden kann.
  5. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Säule (17) auch mit einer Befestigungsplatte (33) versehen ist, geschraubt in die Rückseite der Säule unterhalb der auch die mittlere Ebene definierenden Achse (58), welche eine Halteplatte (32) hält, die senkrecht an einem der Enden verschraubt ist, wobei letztere Platte (32) ihrerseits die Kamera (55) stützt, die mittels eines Befestigungsflanschs (31) starr gehalten ist, sowie ein kleines, "stufenförmig" gefaltetes Blech (47), das an der Rückseite der Platte (32) befestigt ist und als Stütze für den oberen Teil eines in sich selbst gefalteten, mit Gelenk versehenen Kanals (44) dient, und dadurch, dass an der Befestigungsplatte (33) darüber hinaus einerseits ein klauenförmiger Gleiter (35) und andererseits ein unter letzterem angeschraubter Flansch (38) befestigt sind.
  6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Arm (30) aus einem Körper (34) gebildet ist, der ein metallisches Profil mit quadratischem Schnitt aufweist, umfassend einerseits an seinen Enden zwei Löcher (51) und zwei Löcher (52), die an seiner Vorderseite bzw. an seiner Unterseite angebracht sind, um dort das Einführen von zwei Schrauben (53) zur Befestigung des Arms (30) an horizontalen (67) oder vertikalen (66) Stäben der Struktur des Gehäuses (2) zu ermöglichen, und umfassend andererseits eine profilierte Schiene (36), die horizontal an seiner Vorderseite befestigt ist und entlang der der Gleiter (35) frei gleiten kann, und dadurch, dass an der Rückseite dieses Körpers (34) ein rechtwinklig gefaltetes Blech (46) befestigt ist, um den unteren Teil eines mit Gelenk versehenen Kanals (44) zu stützen, und im Inneren dieses Körpers (34) sich zwei Achsen (40) befinden, frei in Rotation gehalten und an seinen Enden angeordnet, parallel zur gegenüber der Befestigungsplatte (33) liegenden Vorderseite des Körpers (34), so dass ein Teil von zwei Rollen (39), von denen jede mit einer der für die lineare Bewegung des Beleuchtungselements (10) erforderlichen Achsen (40) verbunden ist, teilweise durch eine an der Vorderseite des Körpers unterhalb der Schiene (36) angebrachten Öffnung aus dem Körper (34) herausragt.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die lineare Bewegung des Beleuchtungselements (10) entlang dem Arm (30) auf Grund der Befestigung eines Flanschs (38) an einem Riemen (37), durch die Rotation des letzteren um zwei Rollen (39) sowohl innerhalb als auch ausserhalb des Körpers (34) entlang seiner Vorderseite vorgesehen ist, und dadurch, dass nur eine der zwei Achsen (40) mittels einer unter dem Körper (34) gehaltenen Übertragungseinheit (42) zur Rotation angetrieben ist und die konventionelle Umsetzung der Drehbewegung einer Achse eines ebenfalls unterhalb des Körpers (34) befestigten Motors (41) in eine senkrechte Drehbewegung, die die betreffende Achse (40) antreibt, durch Eingreifen verschiedener Zahnräder ermöglicht, und dadurch, dass der Körper (34) des Arms (30) an jedem seiner Enden einen Anschlag (48) umfasst, vor dem ein Endlagensensor (49) positioniert ist und neben dem, nur für eines der zwei Enden, noch ein Richtungssensor (50) befestigt ist, der die Bewegungsrichtung des Beleuchtungselements (10) erkennt, und dadurch, dass die Energieversorgung der verschiedenen elektrischen Komponenten durch Kabel (24) erfolgt, die in einem entlang dem Körper (34) befestigten Kanal (43) untergebracht sind und in dem mit Gelenk versehenen Kanal (44), der in der Lage ist, den linearen Bewegungen des Beleuchtungselements (10) zu folgen.
  8. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Gehäuse (2) von gerader prismatischer Gestalt mit achteckiger Basis aus einer Struktur gebildet ist, die einerseits für die Seitenwände zwei Rahmen (65) umfasst, zwischen deren Kanten jeweils regelmässig die vertikalen metallischen Stangen (66) angebracht und befestigt sind, die geschweisst sind und sich mit den horizontalen metallischen Stangen (67) kreuzen, wobei jede dieser Stangen eine Vielzahl länglicher, gleichmässig von einander entfernter Löcher aufweist, und andererseits im Fall der Kanten, die die zwei seitlichen Rahmen (65) des Gehäuses (2) verbinden, vier Winkelbleche (60) umfasst, die um 45° entlang ihrer längeren Seiten gefaltet sind, mit dem Ziel, eine Versteifungsleiste zu bilden, die ihrerseits eine Rinne umfasst, in der die länglichen Kanten jede der Abdeckungen (61, 62, 63) ruhen, wobei die Kanten umgebogen sind und in einer Dichtung (78) enden, wobei die Abdeckungen die Umhüllung des Gehäuses (2) bilden, und dadurch, dass eines der Bleche (60) eine kleine, von einer Platte (75) verschlossene Abdeckung umfasst, vorgesehen für den Durchlass der Kabel (24), die für die Versorgung der Vorrichtung (1) mit elektrischer Energie erforderlich sind.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass vier Heberinge (76) durch Bolzen mit den Oberseiten der seitlichen Rahmen (65) verbunden sind, von denen ein Rahmen mit einer Abdeckung (74) ohne Türen bedeckt ist und der andere, dem ersten gegenüberliegende Rahmen mit einer Abdeckung (68) mit zwei Schiebetüren (69) bedeckt ist, die horizontal zwischen zwei an der Abdeckung (68) angeschraubten Gleitschienen (70) gleiten, wobei jede mit einem Griff (71) versehen ist und mittels eines zurückziehbaren Hakens (72) geschlossen gehalten werden kann, der an dem Ende von einem der zwei Griffe (71) frei drehbar gehalten ist, und dadurch, dass weitere Griffe (73) für einige (61, 68, 74) der Abdeckungen (61, 62, 63, 68, 74) vorgesehen sind.
  10. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass sich gegenüber einer (63) der die Umhüllung des Gehäuses (2) bildenden Abdeckungen (61, 62, 63) eine grosse Öffnung (6) befindet, die durch das Zurücksetzen eines mit der Abdeckung (63) identischen Abschirmbleches (64) gebildet ist, und durch die das Objektiv (56) der Kamera (55) ragt, welche den Streifen (3) betrachtet, der sich ausserhalb des Gehäuses (2) auf zwei Rollen (4, 5) bewegt, welche gegenüber dem Fenster (6) angeordnet sind, zwischen dessen länglichen Kanten zwei Gummiklötze (82) eingeführt sind, die an jedem der beiden im rechten Winkel aus einem geraden, rechteckigen Blech (81) gefalteteten Füsse angeschraubt sind, welche als Stütze für ein aus einer präzisionsgerasterten Platte gebildetes Ziel (80) dienen, und dadurch, dass das Abschirmblech (64) vor dem Fenster (6) hinter dem Streifen (3) mit seinen Enden an zwei an den vertikalen Vorderkanten der Seitenrahmen (65) befestigten Halterungen (79) gehalten ist, wobei das Abschirmblech (64) und die Abdeckungen ( 61, 62, 63, 68, 74) alle mit einem Schnellschliesssystem auf der Basis einer Vierteldrehung einer Vielzahl von Klemmschrauben (77) ausgestattet sind.
EP99116453A 1998-09-02 1999-08-21 Automatische Einrichtung zum Nachweis von Druckfehlern zum Beispiel auf metallisiertes Bahnmaterial Expired - Lifetime EP0983853B1 (de)

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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

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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
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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
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CA2280522C (en) 2003-01-28
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DE69907344D1 (de) 2003-06-05
EP0983853A1 (de) 2000-03-08
JP3203237B2 (ja) 2001-08-27
CH692847A5 (fr) 2002-11-29
ES2199508T3 (es) 2004-02-16
US6496219B1 (en) 2002-12-17
DE69907344T2 (de) 2004-03-25

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