EP2269824B1 - Procédé et dispositif de surveillance de l'ajustement du traitement de matériaux en forme de bandes dans des installations - Google Patents

Procédé et dispositif de surveillance de l'ajustement du traitement de matériaux en forme de bandes dans des installations Download PDF

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Publication number
EP2269824B1
EP2269824B1 EP20090008643 EP09008643A EP2269824B1 EP 2269824 B1 EP2269824 B1 EP 2269824B1 EP 20090008643 EP20090008643 EP 20090008643 EP 09008643 A EP09008643 A EP 09008643A EP 2269824 B1 EP2269824 B1 EP 2269824B1
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EP
European Patent Office
Prior art keywords
image
recording
module
web
point
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.)
Not-in-force
Application number
EP20090008643
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German (de)
English (en)
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EP2269824A1 (fr
Inventor
Klaus Reckefuss
Volker Schönfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BST Eltromat International Leopoldshoehe GmbH
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Eltromat GmbH
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Filing date
Publication date
Application filed by Eltromat GmbH filed Critical Eltromat GmbH
Priority to EP20090008643 priority Critical patent/EP2269824B1/fr
Publication of EP2269824A1 publication Critical patent/EP2269824A1/fr
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Publication of EP2269824B1 publication Critical patent/EP2269824B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks

Definitions

  • the invention relates to a method and a device for monitoring the fitting processing of web-like materials in installations according to the preamble of claim 1 or according to the preamble of claim 13.
  • the processing of web-like materials such as printed products is carried out at increasingly higher web speed.
  • the processing also includes further processing processes such as perforating, stamping, embossing, creasing, painting, etc. in an in-line operation, i. even while the train is running, without the product resting.
  • web-tracking devices have become commonplace which illuminate the web by means of a stroboscope and produce images therewith.
  • the use of video cameras can achieve a high quality, still image that allows a very good evaluation of the quality of a print.
  • German utility model application DE 200 07 621 The company Drello GmbH is therefore proposed a device that works with two cameras already used for conventional web observation and both with opposite cameras and with cameras that can work with a relative offset to each other. This is achieved by simultaneously displaying one and the same mark on the web on both sides of the captured image.
  • each camera image contains one and the same reference point, at which the printer can then orient himself in the assessment of a mutual fit of the images applied on different sides.
  • a disadvantage of this method is that a not very simple additional device must be used and both cameras must be arranged at least so close to each other that the same marking device (there is proposed a laser) still comes to rest in the image field of both cameras. Such an arrangement is often not possible for reasons of web guide in the machine and other mechanical engineering conditions.
  • a video link observation system consisting in each case of an image acquisition module 1 opposite the front of a printed web 7 and an image acquisition module 2 opposite the back side of the same printed web, an adjustment module 14, a synchronization module 10, an image storage module 12, an image evaluation module 15 and display module 13 is installed in the machine (FIG. Fig. 1 ).
  • the two image acquisition modules consisting of at least one camera, a lens, an associated illumination, an electronic control unit and possibly adjusting motors and a mechanical device, are designed as a compact assembly. Both image pickup modules can each be moved along a traverse 3, 4 transversely to the web running direction.
  • a rotary encoder 8 is mounted as a format clock module which generates one format pulse on one revolution generated, which is forwarded to the synchronous module 10.
  • a friction wheel is mounted on the moving web as Bahnwegmessmodul 9, the scope of which rolls passively on the web, travels over a revolution a well-known distance, thereby emits a known number of pulses, which are forwarded as a wegproportionale information to a synchronous module 10 become. It is advantageous for a conversion if the circumference of the friction wheel makes up an integer fraction of a meter.
  • the image acquisition times for the two cameras are calculated from the aforementioned incoming information as well as previously known geometric information and / or information entered via the operating module 14, such as the distance between the image acquisition modules 1 and 2 and the thickness of the web material.
  • the screen is divided into 2 parts here in the display module 13, with the front side image being shown on one side and the back side image being precisely positioned relative to one another on the other.
  • the image is recorded and displayed in the web running direction exactly aligned.
  • the distance between the center lines of the camera images is measured by means of a highly accurate scale printed on virtually non-stretchable material of known thickness. This measure is converted to a scale thickness zero, so that in this way the normalized distance between the two camera positions is determined. This measure is entered, for example, via the operating module and stored in the synchronous module. If the system additionally has an image processing module 15, this distance can also be automatically calculated from features of two recorded images of such a scale.
  • the friction wheel 9 If the friction wheel 9 is located in front of a deflection roller 16 on the inner side of the track, then the distance normalized to zero between the two cameras 1, 2 is equal to the true path traveled by the friction wheel 9. If the friction wheel 9 is mounted on a side opposite to a deflection roller, then this length must be converted accordingly.
  • the material thickness of the printing substrate is then entered via the input module 14 of the video web monitoring system and the effective distance to be expected of the cameras is calculated by the synchronizing module 10 with the aid of the data for a thickness zero and the thickness information.
  • the length of a format i. the length, which constitutes exactly one repetition of a pressure, is effected by a revolution of a format cylinder 5, for example of the printing plate cylinder, and therefore also represents the distance between two format pulses (zero momentum) from the rotary encoder 8 mounted there.
  • the friction wheel 9 rolls over a certain length, with exactly the length of the printed product stretched at this point passing between 2 format pulses. In this way, the current stretched format length is determined as the rotational path which the friction wheel 9 has covered.
  • a first image is taken from a first side of the path through the associated image acquisition module. This image is stored in the image storage module 12 as a first image. From the above-mentioned data is subsequently calculated by the synchronous module 10 by which distance the to be made on the second side recording of the made on the first page shot has to be made so that it meets exactly the same point of the web, as the first made Picture of the other side of the track. The synchronous module 10 then initiates an image acquisition in the second image acquisition module with a corresponding delay. This image is stored in the image storage module 12 as a second image.
  • a first position is read from the memory and used for a first image pickup device as pre-positioning, while based thereon by means of the abovementioned Method of the moment of recording the second image pickup device is calculated.
  • sources for example, precursor information
  • Both stored images are shown by a display module 13, for example, now arranged on the screen that comes exactly to lie in the web running direction in the middle of the screen exactly the center of the two pictures taken in each case.
  • a crosshair or another marking can additionally be superimposed by the display module into the image, which can still be advantageously displaced in its position via the operating unit.
  • the operator can accurately recognize the current mutual position of the machining results on both sides and correct if necessary by intervention.
  • roller 34 Fig. 2
  • two friction wheels 31, 33 are then used, for example, which, as already described above, each determine the different format lengths and transmit them to the synchronization module.
  • the synchronous module then calculates the respective image recording times taking into account the associated path expansions.
  • both methods can also be used in combination, so that, for example, the material thickness and the change in the recording time due to material expansion are taken into account in the calculation of the recording time and only the changes in the geometry of the image resulting from differences in strain are correctively compensated for the representation become.
  • an automatic evaluation of the images in an image processing module added to the system may result in an automatic evaluation Determining the offset in the register of the top and bottom done by a target position with a recorded actual position is compared by a suitable image evaluation and displayed the determined offset displayed or compensated by a control device.
  • the procedure can also be modified such that one of the images for reproduction in the ratio of the measured image sizes measured during the calibration is reduced or enlarged, wherein the image processing module previously makes a corresponding geometric processing such as compression or elongation.
  • the magnification of the two recording modules can be determined in that at least one of them receives a pattern of known size and the image scale is determined therefrom in the image evaluation module.
  • the magnification of at least one camera is changed until it corresponds to a given imaging scale sufficiently well.
  • both recording modules can use a pattern of known size.
  • the scale can be arranged outside the material web region, the image acquisition module approaching this position before image acquisition and determining and / or adjusting the image scale.
  • the images or sub-images may be altered to have the same or different predetermined elongation. Furthermore, it is possible to determine an assignment of two images or partial images by the target result of a subsequent further processing of the processed material web 7.
  • a further advantageous embodiment which is based on the use of an additional image processing module 15 (FIG. Fig. 1 ), it allows to save the Reibradan Aunt by the format length from the distance of the repetition of two significant areas of the printed periodically repeating print image is determined. Such areas can also be trademarks.
  • the correction of the format length is not taken into account by the fact that this is included in the delay between the recording of the one side and the recording of the second page, but rather the representation of one of the two fields on the monitor by exactly this Amount shifted takes place while the recording always takes place with a constant shift of the image triggering.
  • the determination of the register from front to back is limited in the case of a visual evaluation on the monitor by the resolution of the monitor, i. Only location information with a resolution of 1 pixel can be displayed reliably. Offsetting the correction in the last-mentioned manner is therefore permissible in every case and does not lead to any reduction in the accuracy in the method.
  • the display of the top and bottom images is done on the same monitor side by side or with each other. For an optimal recognizability of the register offset, both images are displayed in the same magnification.
  • a position determined by the printer for the evaluation of the register or also determined, for example, by the method described above under [00025] can be marked in print on an image by displaying a characteristic pixel with the center of a crosshair displayed on the monitor by the display unit Agreement is brought. This marker is superimposed in the second image at the same position and thus serves as a reference for estimating the register offset between top and bottom.
  • image display is the superposition of a top image with the associated image of the bottom.
  • the mixing ratio of the images can be set, for example by the operator, to an optimum transparency for the visual observation.

Landscapes

  • Length Measuring Devices By Optical Means (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (15)

  1. Procédé servant à surveiller le traitement adapté d'une bande de matériau (7) dans des installations, comportant les étapes de procédé suivantes consistant à :
    - traiter la bande de matériau (7) en un premier endroit ;
    - traiter de manière indépendante la bande de matériau (7) en un deuxième endroit, le traitement en deux endroits laissant respectivement une structure identifiable se répétant de manière périodique à distance fixe ;
    - disposer des lieux de prise de vue en des positions qui présentent une distance géométrique fixe prédéfinie, étape caractérisée par les étapes de procédé suivantes consistant à :
    - recevoir un nombre d'impulsions par structure se répétant périodiquement,
    - recevoir des signaux proportionnels à la trajectoire de la bande de matériau (7) au niveau du lieu de prise de vue ;
    - calculer une longueur de structure réelle à partir des signaux proportionnels à la trajectoire de bande et des impulsions par structure périodique ;
    - calculer des moments dans le temps pour la prise de vue à partir de la longueur de structure réelle et des impulsions par structure périodique ;
    - recevoir et mémoriser une première image du premier endroit sur le premier lieu de prise de vue à un premier moment dans le temps ;
    - recevoir et mémoriser une deuxième image du deuxième endroit sur le deuxième lieu de prise de vue à un deuxième moment dans le temps ultérieur ; et
    - afficher de manière simultanée la première image et la deuxième image.
  2. Procédé selon la revendication 1, dans le cadre duquel lors de l'étape de traitement de l'image, au moins une des images prises ou une partie de ces dernières est cherchée selon un détail récurrent dans la structure appliquée et un signal est émis respectivement au moment de la récurrence.
  3. Procédé selon la revendication 2, dans lequel qu'on applique un repère en tant que structure récurrente.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans le cadre duquel le moment d'acquisition de la deuxième prise de vue du deuxième endroit est déduit pour chaque prise de vue à partir de la distance géométrique et de la longueur de formats réelle calculée, sur le lieu de prise de vue.
  5. Procédé selon l'une quelconque des revendications 1 à 4, dans le cadre duquel le moment d'acquisition de la deuxième prise de vue du deuxième endroit est déduit exclusivement à partir de la distance géométrique, et lors de la reproduction, la deuxième image acquise du deuxième endroit est représentée de manière décalée d'une valeur par translation au moyen d'un procédé de calcul, laquelle valeur est calculée à partir de la longueur de structure réelle.
  6. Procédé selon l'une quelconque des revendications 1 à 5, dans le cadre duquel on détermine l'épaisseur du matériau imprimé et on tient compte de la valeur déterminée dans le calcul du moment lors du déclenchement de la prise de vue.
  7. Procédé selon l'une quelconque des revendications 1 à 6, dans le cadre duquel les deux images à prendre et à représenter se trouvent en divers endroits de la bande dans la direction périphérique et/ou dans la direction de manière perpendiculaire par rapport à la direction de roulement de la bande.
  8. Procédé selon l'une quelconque des revendications 1 à 7, dans le cadre duquel la prise de vue se fait avec une échelle de reproduction, qui n'est pas identique à une échelle de reproduction de consigne, et l'image prise n'est pas convertie avant son affichage de manière à ce que la représentation s'effectue selon l'échelle de reproduction de consigne.
  9. Procédé selon l'une quelconque des revendications 1 à 8, dans le cadre duquel un emplacement de prise de vue de consigne du premier endroit est déterminé à partir de données d'étapes préalables numériques connues et un emplacement de consigne du deuxième endroit est calculé au préalable en tenant compte des données géométriques, en particulier de la trajectoire de la bande, de l'échelle de reproduction et de l'épaisseur du matériau, déjà avant le début d'un premier traitement.
  10. Procédé selon l'une quelconque des revendications 1 à 9, dans le cadre duquel des positions d'image choisies de manière arbitraire et prédéfinies sont représentées les unes par rapport aux autres dans un agencement prédéfini, la prédéfinition se faisant par sélection manuelle et un calcul préalable se faisant à l'aide des données d'image numériques par une étape de traitement d'image, et ces données d'image sont générées automatiquement de l'étape préalable ou des images prises, de préférence l'échelle de reproduction et/ou la position de zoom d'une optique de prise de vue étant déterminées à partir des données d'étapes préalables numériques connues et de la résolution géométrique nécessaire pour une analyse des parties d'image à comparer.
  11. Procédé selon l'une quelconque des revendications 1 à 10, la reproduction d'au moins une des images se faisant d'une manière modifiée du point de vue des couleurs.
  12. Procédé selon l'une quelconque des revendications 1 à 11, dans le cadre duquel au moins une partie de toutes les données/images déterminées sont enregistrées dans une mémoire de commande et peuvent être appelées ou ajustées ultérieurement en tout ou partie.
  13. Dispositif servant à surveiller le traitement adapté d'une bande de matériau (7) dans des installations, le traitement en deux endroits de la bande de matériau (7) laissant respectivement une structure identifiable se répétant périodiquement à un intervalle fixe,
    - comportant un premier module de prise de vue (1) orienté sur la bande de matériau (7),
    - comportant un deuxième module de prise de vue (2) orienté sur la bande de matériau (7) ;
    - comportant un module de synchronisation (10), qui détermine le moment de prise de vue du premier module et du deuxième module de prise de vue (1 ou 2) et déclenche respectivement les prises de vue par les modules de prises de vue (1 ou 2) ;
    - comportant un module de cadence de formats (8), qui émet un nombre entier d'impulsions de structure par structure périodique au niveau du module de synchronisation (10) ;
    - comportant au moins un module de stockage d'images (10), qui se trouve en communication de signalisation avec les modules de prise de vue (1, 2);
    - comportant un module d'affichage (13) servant à afficher de manière fidèle à la réalité les images acquises par les modules de prise de vue (1, 2) ; et
    - comportant un module de commande (14),
    caractérisé en ce
    - que les deux modules de prises de vue (1, 2), vus dans la direction de roulement de la bande (R) de la bande de matériau (7), sont disposés l'un par rapport à l'autre à une distance géométrique fixe ;
    - qu'au moins un module de mesure de trajet de la bande (9) est prévu, lequel reçoit des signaux proportionnels au trajet de bande sur le lieu de la prise de vue de l'image, la longueur de structure réelle étant calculée à partir des signaux proportionnels à la trajectoire de bande et des impulsions de structure dans le module de synchronisation (10) et/ou dans le module de prise de vue d'image (1, 2) et le moment pour la prise de vue étant calculé à partir de la longueur de structure réelle et des impulsions de structure par le module de synchronisation (10) et le module d'affichage (13) affichant de manière simultanée la première image et la deuxième image après la prise de vue d'une première image au premier endroit de la bande de matériau (7) à un premier moment dans le temps et après la prise de vue d'une deuxième image au deuxième endroit de la bande de matériau (7) après un deuxième moment ultérieur dans le temps.
  14. Dispositif selon la revendication 13, caractérisé en ce que le module de cadence de formats (8) présente un générateur d'impulsions, qui est couplé de manière fixe au cylindre de formats (5) contenant des formats.
  15. Dispositif selon la revendication 13 ou 14, caractérisé par un module de traitement d'images (15) et/ou par un module de stockage de commandes (16).
EP20090008643 2009-07-01 2009-07-01 Procédé et dispositif de surveillance de l'ajustement du traitement de matériaux en forme de bandes dans des installations Not-in-force EP2269824B1 (fr)

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EP20090008643 EP2269824B1 (fr) 2009-07-01 2009-07-01 Procédé et dispositif de surveillance de l'ajustement du traitement de matériaux en forme de bandes dans des installations

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104853922A (zh) * 2012-11-13 2015-08-19 温德默勒&霍乐沙两合公司 用于对准串联式印刷机的印刷单元的监控系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015201297B4 (de) * 2015-01-26 2024-03-14 Bundesdruckerei Gmbh Vorrichtung und Verfahren zum Bestimmen einer Ausrichtung zwischen einer Vorderseitenmarkierung und einer Rückseitenmarkierung eines Dokumentenkörpers
DE102016204072B4 (de) 2016-03-11 2018-05-03 Koenig & Bauer Ag Verfahren zur Prüfung einer Registerhaltigkeit von auf zwei gegenüberliegenden Seiten eines Bedruckstoffes zu druckenden Druckbildern

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6874420B2 (en) * 1999-10-22 2005-04-05 Cc1, Inc. System and method for register mark recognition
DE20007621U1 (de) 2000-04-27 2000-08-31 DRELLO, Ing. Paul Drewell GmbH & Co. KG, 41179 Mönchengladbach Vorrichtung zur Kontrolle der Position von zweiseitigen Druckbildern
ATE434522T1 (de) * 2000-05-17 2009-07-15 Eastman Kodak Co Verfahren zur registereinstellung an einer mehrfarbendruckmaschine
DE102004033660B4 (de) * 2004-07-12 2008-03-13 Koenig & Bauer Aktiengesellschaft Vorrichtung zur Ermittlung einer von einem bewegten Material entlang einer Bewegungsbahn zurückgelegten Strecke
FI118759B (fi) * 2005-07-01 2008-03-14 Upm Kymmene Oyj Menetelmä ja laitteisto painojäljen laadun tarkkailemiseksi

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104853922A (zh) * 2012-11-13 2015-08-19 温德默勒&霍乐沙两合公司 用于对准串联式印刷机的印刷单元的监控系统

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