EP2626209B1 - Procédé et dispositif de reconnaissance de fonctions erronées de douilles d'une imprimante à jet d'encre - Google Patents

Procédé et dispositif de reconnaissance de fonctions erronées de douilles d'une imprimante à jet d'encre Download PDF

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Publication number
EP2626209B1
EP2626209B1 EP12155040.4A EP12155040A EP2626209B1 EP 2626209 B1 EP2626209 B1 EP 2626209B1 EP 12155040 A EP12155040 A EP 12155040A EP 2626209 B1 EP2626209 B1 EP 2626209B1
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EP
European Patent Office
Prior art keywords
substrate
camera system
nozzle
print
accordance
Prior art date
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Active
Application number
EP12155040.4A
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German (de)
English (en)
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EP2626209A1 (fr
Inventor
Dr. Jörg Eberhardt
Prof Robert Massen
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.)
Baumer Inspection GmbH
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Baumer Inspection GmbH
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Priority to EP12155040.4A priority Critical patent/EP2626209B1/fr
Priority to DE201310002254 priority patent/DE102013002254A1/de
Publication of EP2626209A1 publication Critical patent/EP2626209A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2142—Detection of malfunctioning nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16579—Detection means therefor, e.g. for nozzle clogging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material

Definitions

  • the present invention relates to an apparatus and a method for detecting malfunctions of nozzles on nozzle sticks of an ink jet printer according to claim 1 and claim 7.
  • DOD drop on demand
  • Inkjet printers are matrix printers in which a printed image is produced by the targeted shooting or the deflection of small ink droplets.
  • High performance ink jet printers typically spin up to one billion tiny droplets of ink per square meter onto a substrate to be printed, which passes beneath a number of nozzles of at least one nozzle stack. Each individual small droplet transports an ink volume of a few pico liters. The droplets ejected from the small nozzles are applied to a substrate at ejection frequencies of up to 20 kHz.
  • inks are usually used in cyan, magenta, yellow, and the key color black (CMYK color model).
  • CMYK color model is a subtractive color model that forms the technical basis for modern four-color printing.
  • the abbreviation CMYK stands for the three color components cyan, magenta, yellow and the black component key as color depth.
  • additional colors can be used.
  • the US 2007/0195351 A1 discloses a method and arrangement for reducing the visibility of inkjet printing errors when printing on classical print media.
  • the printed medium is scanned with a scanner which analyzes defects and makes simple corrective measures.
  • the prerequisite here is, however, that the nozzle error immediately after the pressure in the generated by the scanner Inspection image is clearly visible and as a comparison information for visibility of the error is a faultless electronic target image available.
  • test patterns are printed on the substrate at certain time intervals. These patterns are recorded with the help of camera systems and examined for nozzle defects. Systems that require test patterns have the significant disadvantage of disrupting the production of the current job. These test patterns must then be removed from the print job again. This is a particular disadvantage when printing continuous webs, such as decorative film as a roll product for the furniture industry.
  • the EP 1 642 089 B1 teaches on the peculiarity of human perception of multi-colored patterned structures, such as woodgrains, based method of quality control of decor printing by simultaneous monitoring of color statistics and image sharpness.
  • this document describes that a change in image sharpness is perceived as a color shift. Dropping ink jet nozzles form such a place of reduced image sharpness and can therefore be perceived disturbing beyond the visibility as a strip also as a local color shift.
  • the DE102008016538A1 discloses a method for monitoring the visual quality of color images embedded in printed products. For this purpose, after the last printing stage, the printed product is scanned by a camera under a defined illumination. Then, for each 3-channel color image, a 3-dimensional color histogram and an image definition are calculated. This is compared with a reference color histogram and a reference color image sharpness measure. From this, a color deviation measure and a sharpness deviation measure are calculated. Based on these two deviation mass, the cause of a visible color shift can be determined.
  • the US2005024410A1 describes a method for aligning a print carriage carrying print cartridges or printheads.
  • the printer includes an optical scanner disposed on the print carriage and configured to scan a test pattern printed from the print cartridges.
  • the US2002145641A1 describes a sensor for monitoring the print quality.
  • the substrate to be printed is illuminated with a white LED or with three LEDs, which have the colors red, green and blue. Subsequently, the received signal is compared with a reference and adapted according to the received signals, the pressure settings
  • the US2011242187A1 describes a method for printhead alignment in an inkjet printer. For this purpose, a test pattern is printed, which is detected by a sensor to identify the position and orientation of the printheads.
  • the object of the present invention is to provide a simple and inexpensive arrangement for detecting nozzle errors.
  • a device for detecting malfunctions of nozzles on nozzle sticks of an inkjet printer comprising at least one illumination source, a camera system, a control unit and an evaluation unit, wherein the individual nozzle sticks each print one of a plurality of printing inks.
  • a substrate to be decorated can be detected with the aid of the camera system, wherein the decorated substrate is illuminated temporally sequentially with light in the colors of the printing inks used by the at least one illumination source.
  • a sequential color control and the respective time duration of the illumination of the at least one illumination source and interaction with the camera system is performed by the control unit, wherein the evaluation unit is adapted to evaluate the images of the printed pattern of the decorated substrate detected by the camera system by means of image processing methods with respect to defective patterns, the presence of a defect pattern as a criterion for a malfunction of at least one nozzle is evaluable.
  • the productivity of an inkjet printer is significantly increased, since a production interrupting maintenance and / or performing cleaning cycles must be started only when actually a nozzle error and thus a faulty pattern has occurred and preferably also this faulty pattern in the final product exceeds the given visibility threshold.
  • Advantageous embodiments are the subject of the respective subclaims.
  • the at least one illumination source is designed to additionally output light in the near infrared range (NIR).
  • NIR near infrared range
  • the near infrared light is preferably in the range of 780 to 1000 nm.
  • the illumination source may be configured to sequentially change the illumination color, wherein the illumination source is preferably formed as a line illumination source. But it can also be provided different sources of illumination.
  • the camera system can be designed as a monochrome line sensor with which the printed substrate can be imaged onto the sensor line of the monochrome line sensor via an optical system, preferably transversely to the feed direction of the substrate.
  • the evaluation unit can be further generated a measure of the visibility of the defect pattern in the printing pattern of the substrate, for which purpose preferably a ratio of a signal strength of the defect pattern in the captured image of the print pattern of the substrate of the camera system can be determined to the immediate vicinity of the faulty pattern.
  • a housing may be provided, which essentially corresponds in dimensions to that of a print head of a respective ink jet printer, wherein preferably the dimensions, the fastening elements and the supply of the electrical signal lines are identical.
  • the object of the present invention is also achieved with a method for detecting malfunctions of nozzles of an inkjet printer.
  • one of a plurality of printing inks is assigned to the individual nozzle sticks, a substrate to be decorated being detected with the aid of a camera system, the decorated substrate being illuminated sequentially with light in the colors of the printing inks used, the time sequence and the respective duration of a Illumination of a lighting source and the control of the camera system is carried out by means of a lighting control, wherein the detected by the camera system images of a printed pattern of the decorated substrate are evaluated by means of image processing methods with respect to false patterns, wherein the presence of a defect pattern is evaluated as a criterion for malfunction of at least one nozzle ,
  • the printed substrate is additionally illuminated with light in the near infrared range.
  • the faulty patterns correspond to linearly extending strips, which are preferably formed in the printing direction.
  • the evaluation unit determines a measure for the visibility of the defect pattern in the printing pattern of the substrate, for which purpose preferably a ratio of a signal strength of the defect pattern in the captured image of the camera system to the immediate vicinity of the defect pattern is determined and the measure of the visibility is displayed and wherein preferably the control unit is switched when exceeding a predetermined threshold in a print job in which the occurred and existing nozzle error can be visually tolerated or existing nozzle errors can be visually tolerated or stopped production and a cleaning cycle is performed for at least the affected nozzle head.
  • a period of illumination of the printed substrate in the image field of the camera system in the respective color and an integration time of the camera system, in particular of the monochrome line sensor, are selected such that the defective pattern differs from the pattern of the printed substrate.
  • the camera system has a monochrome optical line sensor, which images the printed substrate onto the sensor line of the monochrome optical line sensor via an optical system, preferably transversely to the feed direction of the substrate.
  • the illumination and the camera system are advantageously synchronously controlled in time, so that in each case an image of the printed substrate in the respective printing ink is detected by the camera system.
  • the printing inks preferably correspond to the colors cyan, magenta, yellow and black (CMYK).
  • a colorimetric stability of the printed motif of the substrate is additionally monitored from the images of the printing pattern recorded successively under the switched illuminations by the camera system by means of calculating integral color deviation mass.
  • Fig. 1 shows an ink jet printer with four stationary nozzle sticks 3.
  • a printing pattern 30 on a substrate 4 four primary colors CYAN C, MAGENTA M, YELLOW Y and BLACK K are used.
  • Each base color C, M, Y, K is associated with a nozzle 3 each.
  • a nozzle 3 includes a plurality of small nozzles 2 are brought by the color droplets on the substrate 4.
  • the substrate 4 consists of a bright ceramic blank - the tile 5.
  • the bright substrate 4 is moved mechanically at a constant and known speed under the arrangement of the four nozzle sticks 3 (shown with an arrow in FIG Fig. 1 ).
  • the nozzle sticks 3 eject ink droplets in the respective base color K (black), the base color Y (yellow), the base color M (magenta) and the base color C (CYAN) onto the substrate 4 from a plurality of smallest nozzles 2 corresponding to the printing pattern 30 to be printed
  • the printing pattern 30 is stored as a RIP file (raster image processor file) in a memory 24 and can be called up by the latter by the control unit 6.
  • the nozzles 2 of the nozzle sticks 3 generate a recognizable colored decoration formed by the smallest dots - the printing pattern 30.
  • the tile 5 provided with the printing pattern 30 is subsequently detected by a camera system 8.
  • color line scan cameras are used for such surface inspection tasks, which generate a line-by-line RGB color image of the surface and send it to an evaluation unit.
  • Fig. 2 As can be seen, the very thin longitudinal lines produced by a clogged nozzle or by a nozzle that no longer closes are not or only very difficult to recognize in an RGB color image.
  • FIG. 2 shows the section of a tile decoration produced by an inkjet printer of a printing pattern 30 with a nozzle defect through a single clogged nozzle 2 of the color Y.
  • An evaluation is carried out, as is known, via an analysis of the RGB color image.
  • Is shown in Fig. 2a schematically a brightness image extract of the RGB color image of the camera system 8 of Fig. 1 , In this case, the nozzle defect can not be recognized in a monochrome brightness image formed from the RGB color image.
  • the same print pattern 30 is shown with the same nozzle error of the nozzle 2 of color Y.
  • Shown schematically is a BLUE color separation of the RGB color image of the camera system 8.
  • the precipitated nozzle 2 is very weakly recognizable as a bright line.
  • a nozzle defect in the BLUE extract of the RGB color image of the camera system 8 which in principle appears to be stronger due to the lack of the base color Y, can only be recognized extremely faintly.
  • the result of the presentation in Fig. 2b was calculated by computational transformation of the RGB color space of the camera system 8 (FIG. Fig. 1 ) into the CMYK color space.
  • Fig. 2c For example, the same print pattern 30 is shown with the same nozzle error of the nozzle 2 of color Y.
  • Fig. 2c is a Y color separation of the print pattern 30 as an image pick - up of a line sensor 10 of the camera system 8 (shown in FIG Fig. 3 ) after application of the inventive method.
  • the failed nozzle is clearly recognizable as a missing Y signal.
  • a "line-shaped signal" with the amplitude ZERO is present.
  • a nozzle error of one or more nozzles 2 of the nozzle assembly 3 for the color Y very clearly visible in the image of the camera system 8 in the form of a dark line.
  • the color Y is missing here.
  • the camera system 8 can be designed with a CMYK color filter (not shown).
  • CMYK camera is simulated for the inspection of the CMYK print pattern 30 of an inkjet printer with the inks CMYK for the decoration of flat substrates 4.
  • Fig. 3 An embodiment of the device according to the invention for detecting malfunctions of nozzles 2 on nozzles 3 of an inkjet printer is shown.
  • the substrate 4 to be decorated in the pass is decorated in a known manner in the multicolor subtractive CMYK printing process with the aid of four ink droplets 3 K, Y, M and C ejected in accordance with a printing pattern.
  • the substrate 4 is scanned with a camera system 8 installed transversely to the feed direction.
  • the camera system 8 includes a monochrome (ie black / white) line sensor 10, with which a line-shaped image recording takes place.
  • the printed surface is imaged on the sensor line of the line sensor 10 via an optical system (not shown) transversely to the feed direction of the substrate.
  • the substrate 4 is illuminated by four illumination sources 12 in the colors CYAN, MAGENTA, YELLOW and in the near infrared region NIR.
  • the illumination sources 14 emits light in the color CYAN
  • the illumination source 16 emits light in the color MAGENTA
  • the illumination source 18 emits light in the color YELLOW
  • the illumination source 20 emits light in the near infrared range.
  • the illumination sources 12, 14, 16, 20 are switched on one after the other for a short time.
  • a control unit 6 is used to control the illumination sources 12, 14, 16, 20.
  • only one illumination source 12 may be provided, which alternately transmits light in the previously listed colors.
  • the output signals of the line sensor 10 are evaluated by an evaluation unit 22 for the detection of one or more line-shaped nozzle errors, which are generated by clogged (blocked) nozzles 22 within a nozzle block 4 or by open (no longer closing) or irregularly operating nozzles 22.
  • the result of the inspection is continuously displayed on a display unit 26 and / or transmitted as a control signal in the printer control via an interface 28.
  • the moving substrate 4 is thus printed by ejecting ink droplets with a resolution of 300 dpi and scanned by a downstream optical monochrome line sensor 10 of the camera system 8. Furthermore, a preferably diffuse illumination of the substrate 4 is produced by four switchable, preferably line-shaped illuminations of the illumination sources 12, 14, 16, 20 with the colors CYAN, MAGENTA, YELLOW and NIR.
  • the line sensor 10 operates with a resolution which is similar to or higher than that of the nozzle head.
  • the substrate 4 printed with the duck pattern 30 is detected by the line sensor 10 from a vertical viewing direction via line optics.
  • the color separation K (for BLACK) is exposed according to the invention with a light source in the near infrared NIR.
  • a light source in the near infrared NIR Preferably exposed in a wavelength range of 750-980 nm. In this wavelength range, all C, M, Y colors appear in almost same shade of gray.
  • the carbon-containing black ink pigments absorb very strongly, so that the illumination source 20 in the said NIR range is optimally suited for detecting black ink droplets.
  • These four color separation line images have in the transverse direction of the tile 5 the full pixel resolution of the monochrome line sensor 10, for example 300 dpi. In the feed direction, the resolution is only a quarter due to the four successive exposures with light of the colors CYAN, MAGENTA, YELLOW and the near infrared.
  • this reduction of the resolution in the feed direction is irrelevant for the detection of nozzle defects, since these defects are expressed as extended elongated strips with either a blocked nozzle 2 or with a nozzle 2 which no longer closes.
  • a good discrimination of a nozzle error in the printed motif on the substrate 4 is achieved, and by a precise localization of the defective nozzle 2, a good identification of the defective nozzle stock 3 of the colors C, Y, M or K.
  • the nozzle errors typical for ink-jet printing can be detected automatically at an early stage and their visibility can be evaluated.
  • the line image signal generated by the line sensor 10 then forms in the feed direction in each case the sum of all brightnesses along a feed of 50 millimeters.
  • This is mathematically identical to the calculation of the mathematical projection in the feed direction X of the brightness values under the respective switched-on color C, Y, M or K.
  • the summation-based projection is a simple method of contrasting weak signals with background noise, in which case the "signal" consists of the erroneous "nozzle track" and the noise from the printed print pattern 30 (see Fig. 2a to 2c ).
  • this projection can be performed numerically by summing up the digitized brightness values of the line sensor 10 in an evaluation unit 22 not only purely optically via an extended exposure time but also with the known methods of image processing.
  • the inventive device can be designed in a particularly advantageous structural design in their design, fasteners and alignment on the printing unit as the nozzle blocks to be monitored 3 itself (not shown).
  • the nozzle sticks 3 are compact units which can be connected to one another with lateral fastening elements, a nozzle plate facing the substrate 4, and a supply of the electrical signals for the control of the piezo-ceramic ejectors.
  • the manufacturers of ink jet printers line up a plurality of nozzle sticks 3 in a row or in a meandering manner and can pass through them high modularity cost-effective to build printers with customized requirements for a wide variety of applications and resolutions. Due to the advantageous design of the inventive device is achieved that existing mounting and alignment systems and brackets can be used optionally for the installation of a nozzle assembly 3 or an inventive optical imaging inspection head and thus both the retrofitting of an existing inkjet printer with the inventive device and the primary Production of an inkjet printer with an integrated inventive device can be carried out inexpensively.
  • the automatic detection of a faulty nozzle 2 with the camera system 8 is according to the invention not limited to the detection and identification of faulty nozzles 2 in terms of function monitoring, but according to the invention supplemented by an automatic assessment of visibility for the human observer or the nozzle error in the finished product.
  • the goal is not to unnecessarily reduce the productivity of an inkjet printer by causing any automatically detected nozzle failure to trigger a production shutdown with a cleaning and / or maintenance cycle.
  • the productivity should be increased despite the occurrence of nozzle errors in that the cleaning and / or maintenance cycle is triggered only from a predetermined visibility threshold of the nozzle error or errors that have occurred.
  • the evaluation unit 22 evaluating the signals of the camera system 8 additionally calculates a numerical "visibility" after the detection of errors of the nozzle 2, for example by the described projection of the brightness values. This can for example be based on the evaluation of the signal / noise ratio of the projection curve in the immediate vicinity of the faulty nozzle 2.
  • non-linear functionals such as the root are used as the logarithm.
  • the current production is therefore automatically stopped only if the visibility S exceeds a visibility specified by the machine operator, the quality department or the end customer.
  • the idea of the invention is not limited to DOD printers in the CMYK color system.
  • additional switchable illuminations are used according to the invention, at the wavelength of which the nozzle errors of the affected nozzle sticks differ particularly strongly from the background motif.
  • switchable transmitted-light illuminations are used according to the invention, which light is analogous to the CMYK color space in the range of RED, GREEN, BLUE and near infrared, and the nozzle errors are detected and identified accordingly by texture analysis and line detection of these monochromatic images.
  • analogue-directed illuminations are used, which make the nozzle aberrations appear particularly high-contrast in the image of the line sensor
  • the signals of the inspection camera are also evaluated for the automatic monitoring of the visual overall color impression of the decorated substrate in addition to the detection of nozzle errors.
  • the color deviation mass CIE-Lab known to the printer is calculated and displayed and compared with the predetermined tolerances.
  • the concept of the invention furthermore relates to all printer technologies working with DOD, also those which work with so-called functional inks, such as silver conductive pastes, in the printing technology production of solar cells, chemically organic inks for the production of biological microdetectors, spatially building inks for the production of three-dimensional substrates.
  • functional inks such as silver conductive pastes
  • the inventive idea is not limited to specific motifs and substrates to be printed.
  • the synonymous terms "decor” and "motif” in the context of this application include natural images such as wood or marble decors, synthetic and artistically designed pictorial motifs and photographic reproduction of image scenes. These patterns and motifs can contain graphic elements and text elements.
  • “Substrate” describes all rigid, flexible, flat or spatially curved surfaces that can be decorated using DOD techniques.
  • the concept of the invention is also not limited to exemplified "single-pass" printers in which stationary printing blocks are used to print a substrate moving under them.
  • a simple, cost-effective arrangement suitable for all possible decorative and image prints is made possible and a method suitable for this purpose is provided with which a digitally decorated surface can be continuously and automatically inspected for the presence of nozzle defects and the visibility of occurred nozzle errors can be assessed for human perception.
  • a cleaning cycle would take place or a product change to a decoration be made in which this error does not visually disturb.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)

Claims (15)

  1. Dispositif de détection de dysfonctionnements de buses (2) sur des porte-buses (3) d'une imprimante à jet d'encre, composé d'au moins une source d'éclairage (12), un système de caméra (8), une unité de commande (6) et une unité d'évaluation (22), les différents porte-buses (3) imprimant avec respectivement l'une des plusieurs encres d'impression, un substrat à décorer (4) pouvant être détecté à l'aide du système de caméra (8),
    caractérisé en ce que
    l'unité de commande (6) est conçue pour éclairer le substrat décoré (4) de manière séquentielle dans le temps avec de la lumière dans les couleurs des encres d'impression utilisées de la au moins une source d'éclairage (12), la commande des couleurs séquentielle et la durée respective de l'éclairage de la au moins une source d'éclairage (12) et une coopération avec le système de caméra (8) de l'unité de commande (6) ayant lieu, l'unité d'évaluation (22) étant conçue pour évaluer les images d'un modèle d'impression (30) du substrat décoré (4) détectées par le système de caméra (8) au moyen du procédé de traitement d'image concernant le modèle défectueux, l'existence d'un modèle défectueux pouvant être évaluée en tant que critère de dysfonctionnement d'au moins une buse (2).
  2. Dispositif selon la revendication 1, caractérisé en ce que la au moins une source d'éclairage (12, 20) diffuse également de la lumière dans l'infrarouge proche ou une autre source d'éclairage (12, 20) est prévue pour émettre de la lumière dans l'infrarouge proche.
  3. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la au moins une source d'éclairage (12) modifie de manière séquentielle la couleur d'éclairage, la source d'éclairage (12) étant conçue sous la forme d'une source d'éclairage linéaire.
  4. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le système de caméra (8) se présente sous la forme d'un détecteur de lignes monochrome (10), avec lequel le substrat décoré (4) peut être reproduit via une optique, de biais par rapport à la direction d'avancement du substrat (4), sur une ligne de détecteur du détecteur de lignes monochrome (10).
  5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'unité d'évaluation (22) permet de déterminer une grandeur pour la visibilité du modèle défectueux dans le modèle d'impression (30) du substrat (4), un rapport d'une intensité de signal du modèle défectueux dans l'image détectée du système de caméra (8) avec l'environnement direct du modèle défectueux pouvant être déterminé et l'unité de commande (6) étant conçue en fonction de critères concernant un degré de visibilité du modèle défectueux et des exigences de qualité du modèle d'impression (30) pour prendre une décision, de manière automatique ou à l'aide d'un guidage d'utilisateur, entre
    - une impression sans interruption,
    - une commutation vers une autre impression, dans laquelle l'erreur de buse survenue et toujours présente peut être tolérée visuellement ou
    - une interruption de l'impression et l'exécution d'un cycle de nettoyage sur au moins la buse (2), qui a provoqué une impression défectueuse.
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un boîtier est prévu, lequel correspond essentiellement au boîtier d'une tête d'impression, les dimensions, les éléments de fixation et l'amenée des câbles de signaux électriques étant exécutés de manière identique.
  7. Procédé de détection de dysfonctionnements de buses (2) d'une imprimante à jet d'encre, les différents porte-buses (3) étant chacun affectés à l'une des plusieurs encres d'impression, un substrat à décorer (4) étant détecté à l'aide d'un système de caméra (8),
    caractérisé en ce que le substrat décoré (4) est éclairé de manière séquentielle dans le temps avec de la lumière dans les couleurs des encres d'impression utilisées, l'ordre chronologique et la durée respective d'une source d'éclairage (12) et la commande du système de caméra (8) étant réalisés au moyen d'une unité de commande (6), les images d'un modèle d'impression (30) du substrat décoré (4) détectées par le système de caméra (8) étant évaluées au moyen du procédé de traitement d'image en ce qui concerne le modèle défectueux, l'existence d'un modèle défectueux étant évaluée en tant que critère de dysfonctionnement d'au moins une buse (2).
  8. Procédé selon la revendication 7, caractérisé en ce que le substrat décoré (4) est également éclairé avec de la lumière dans l'infrarouge proche.
  9. Procédé selon l'une des revendications 7 ou 8, caractérisé en ce que les modèles défectueux correspondent à des bandes de forme linéaire, qui sont formées dans le sens de l'impression.
  10. Procédé selon l'une des revendications 7 à 9, caractérisé en ce qu'une unité d'évaluation (22) détermine une grandeur pour la visibilité du modèle défectueux dans le modèle d'impression (30) du substrat, pour ce faire un rapport d'une intensité de signal du modèle défectueux dans l'image détectée du système de caméra (8) avec l'environnement direct du modèle défectueux étant déterminé et la grandeur de la visibilité étant affichée et l'unité de commande (6) étant conçue en fonction de critères concernant un degré de visibilité du modèle défectueux et des exigences de qualité du modèle d'impression (30) pour prendre une décision, de manière automatique ou à l'aide d'un guidage d'utilisateur, entre
    - une impression sans interruption,
    - une commutation vers une autre impression, dans laquelle l'erreur de buse survenue et toujours présente peut être tolérée visuellement ou
    - une interruption de l'impression et l'exécution d'un cycle de nettoyage sur au moins la buse (2), qui a provoqué une impression défectueuse.
  11. Procédé selon l'une des revendications 7 à 10, caractérisé en ce qu'une durée d'éclairage du substrat décoré (4) dans le champ d'image du système de caméra (8) dans la couleur respective et une durée d'intégration du système de caméra (8) sont choisies de façon à ce que le modèle défectueux se distingue du modèle d'impression (30) du substrat imprimé (4).
  12. Procédé selon l'une des revendications 7 à 11, caractérisé en ce que le système de caméra (8) présente un détecteur de lignes optique monochrome (10), qui reproduit le substrat décoré (4) via une optique, de biais par rapport à la direction d'avancement du substrat (4), sur une ligne de détecteur du détecteur de lignes optique monochrome (10).
  13. Procédé selon l'une des revendications 7 à 12, caractérisé en ce que la source d'éclairage (12) et le système de caméra (8) sont commandés de manière synchrone dans le temps de sorte qu'une image du modèle d'impression (30) dans l'encre d'impression respective soit détectée par le système de caméra (8).
  14. Procédé selon l'une des revendications 7 à 13, caractérisé en ce que les encres d'impression correspondent aux couleurs cyan, magenta, jaune et noir (CMJN).
  15. Procédé selon l'une des revendications 7 à 14, caractérisé en ce qu'en outre, une stabilité colorimétrique du motif imprimé du substrat (4) est surveillée au moyen du calcul de la grandeur d'aberration chromatique intégrale « delta L, a, b » à partir des images du modèle d'impression (30) enregistrées par le système de caméra (8).
EP12155040.4A 2012-02-12 2012-02-12 Procédé et dispositif de reconnaissance de fonctions erronées de douilles d'une imprimante à jet d'encre Active EP2626209B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12155040.4A EP2626209B1 (fr) 2012-02-12 2012-02-12 Procédé et dispositif de reconnaissance de fonctions erronées de douilles d'une imprimante à jet d'encre
DE201310002254 DE102013002254A1 (de) 2012-02-12 2013-02-12 Modularer Düsenstock mit Überwachungsmodul

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EP12155040.4A EP2626209B1 (fr) 2012-02-12 2012-02-12 Procédé et dispositif de reconnaissance de fonctions erronées de douilles d'une imprimante à jet d'encre

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CN104417066A (zh) * 2013-09-09 2015-03-18 北大方正集团有限公司 闪喷控制方法及设备
DE102015207566B3 (de) * 2015-04-24 2016-04-14 Heidelberger Druckmaschinen Ag Verfahren zur Detektion ausgefallener Druckdüsen in Inkjet-Drucksystemen
ES2618301B1 (es) * 2015-11-17 2018-04-12 Teclass Sl Máquina y procedimiento de impresión digital sobre vidrio mono-pasada
DE102018220524A1 (de) * 2018-01-25 2019-07-25 Heidelberger Druckmaschinen Ag Verfahren zur Detektion ausgefallener Druckdüsen in einer Inkjet-Druckmaschine
EP3680106B1 (fr) 2019-01-11 2023-08-23 Heidelberger Druckmaschinen AG Détection de moyenne en nombre mn dans l'image d'impression

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US5448269A (en) * 1993-04-30 1995-09-05 Hewlett-Packard Company Multiple inkjet cartridge alignment for bidirectional printing by scanning a reference pattern
US6352331B1 (en) 1997-03-04 2002-03-05 Hewlett-Packard Company Detection of non-firing printhead nozzles by optical scanning of a test pattern
US6419342B1 (en) * 1999-11-19 2002-07-16 Koninklijke Philips Electronics N.V. Multi-function monitoring module for a printer
US7142983B2 (en) 2003-07-03 2006-11-28 Northrop Grumman Corporation Method for the processing of non-continuous atom interferometer intertial instrument measurements and continuous wide bandwidth instrument measurements with a gravity database
US7055925B2 (en) * 2003-07-31 2006-06-06 Hewlett-Packard Development Company, L.P. Calibration and measurement techniques for printers
JP4474870B2 (ja) 2003-08-27 2010-06-09 セイコーエプソン株式会社 液滴視認方法、液滴吐出ヘッド検査装置および液滴吐出装置
US8223350B2 (en) 2006-02-21 2012-07-17 Xerox Corporation System and method for minimizing visibility of print defects
DE102008016538A1 (de) * 2008-03-29 2009-10-01 Baumer Inspection Gmbh Überwachung der visuellen Qualität von in Druckprodukten eingebetteten Farbbildern
US20110242187A1 (en) * 2010-04-06 2011-10-06 Xerox Corporation Test Pattern Effective For Fine Registration Of Inkjet Printheads And Method Of Analysis Of Image Data Corresponding To The Test Pattern In An Inkjet Printer

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