EP1454746B1 - Image inspection system for a printing press - Google Patents

Image inspection system for a printing press Download PDF

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Publication number
EP1454746B1
EP1454746B1 EP04003728A EP04003728A EP1454746B1 EP 1454746 B1 EP1454746 B1 EP 1454746B1 EP 04003728 A EP04003728 A EP 04003728A EP 04003728 A EP04003728 A EP 04003728A EP 1454746 B1 EP1454746 B1 EP 1454746B1
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EP
European Patent Office
Prior art keywords
printing
image
inspection system
image inspection
sheet
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Revoked
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EP04003728A
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German (de)
French (fr)
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EP1454746A1 (en
Inventor
Andreas Dipl-Phys. Lippold
Hans-Willy Schütz
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Manroland Sheetfed GmbH
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MAN Roland Druckmaschinen AG
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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
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • B41J11/42—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
    • B41J11/46—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering by marks or formations on the paper being fed

Definitions

  • the invention relates to an image inspection system for a printing press according to the preamble of claim 1.
  • the evaluation of the print quality is carried out by drawing a test sheet, which is then placed on an extra pile and recorded and evaluated visually and / or metrologically.
  • a quality assessment is only a sample, so that a slow change in quality may not be noticed until after a long period of time, which then results in a corresponding amount of waste.
  • sample sheet random quality defects for example, caused by oil spills, slugs or scratches, difficult to grasp. Accordingly, it can not be prevented that a corresponding amount of unnoticed waste landed in the display, which then has to be sorted out before further processing by appropriate steps.
  • Permanent quality monitoring is possible with printing machines if, in particular after the last printing unit, an image recording device in the form of a camera together with image processing is arranged.
  • image inspection systems are known for example from EP 1 190 855 A1 and EP 0 884 182 B1.
  • the image data obtained by the image recording device are compared pixel by pixel with predetermined setpoint values, whereupon, in the event of deviations from setpoint values, either warnings are issued or the printing process is intervened in a corrective manner.
  • a method and a corresponding device for the identification of arched objects are known.
  • a device for front and back sheet inspection is provided, which is arranged downstream of a sheet-fed printing machine and the boom is upstream.
  • the devices for sheet inspection is also followed by a printing device by means of which markers for information on the qualification of error-free or faulty printed sheet can be imprinted on the edge of the sheet.
  • the printed sheets can be stored in the boom on a stack with error-free or with faulty printed sheet.
  • the object of the present invention is therefore to expand an image inspection system for a printing press in such a way that the information obtained by the image processing can be utilized in a simple manner even after printing.
  • a printing device is connected downstream, by means of which at designated locations on the substrate markings can be generated.
  • the device By means of the device according to the invention, it is possible to mark areas identified as defective by means of the image processing on the printing material, so that these can then be recognized in the further processing either by an operator or a further image inspection system.
  • appropriate measures can be taken in a simple manner, waste can be discharged or the defective areas are separated from the rest of the substrate.
  • the printing device arranged downstream of the image recording device can preferably be an inkjet printer, a laser printing device or an imprinting device, as they are preferably used for numbering.
  • the intended locations on the substrate characterizing markings may be formed as dashes, arrows or colored areas. If an automatic identifier is provided in the further processing, the markings impressed by the printing device provided according to the invention are designed accordingly.
  • the printing device provided according to the invention and connected downstream of the image processing, it is possible to identify, for example, defective image locations.
  • This can be in particular color and / or oil splashes, scratches in the printing surface or caused by slips artifacts.
  • Especially very small and very difficult to recognize image defects are highlighted by the marker, so that the corresponding sheet can be easily recognized and removed by an operator or removed in the processing by automation.
  • the use of the invention in the printing of multiple uses designed in label printing, a large number of labels are placed on a printed sheet in such a way that the largest possible number results. If defects are now detected by the image recording device and image processing on one or more of the labels, then one or more defective labels can be marked via the downstream printing devices.
  • an image recording and image processing punching or folding device for punching / folding of the labels then marked as defective labels can be ejected and separated from the correctly printed, error-free. Further processing of waste paper is thus avoided and additional facilities for quality assurance can be omitted.
  • a mark visible to the human eye it may also be provided to provide the image areas identified as defective with an invisible marking.
  • a spectral range for color and lighting is chosen, which lies outside the human perception.
  • a control device in the further processing - for example, an automatic adhesive flap control of folding carton production - is adapted accordingly to this spectral situation.
  • FIG. 1 shows the last printing unit of a sheet-fed offset printing machine with an extension device arranged downstream of this printing unit and extending in front of the delivery arm.
  • the printed in the front printing units are conveyed and printed on the impression cylinder 1 of the last printing unit.
  • the sheets are then transferred from the impression cylinder 1 via a transfer drum 5 to a cylinder 6, from which then the transfer to the chain system of the boom (delivery drum) takes place. Finally, the sheets are then deposited on the illustrated delivery pile.
  • the impression cylinder 1 of the last printing unit is assigned a trained as a line camera image pickup device 2.
  • the illumination of the image point of the arc detected by the line camera 2 is effected by means of a lighting device 3 embodied as a fluorescent lamp.
  • the image recording device 2 is followed by an image processing 4.
  • the image processing 4 is additionally connected to a signal transmitter 9, preferably designed as an angle transmitter, by means of which the movement of the printing material on the surface of the impression cylinder 1 can be detected.
  • the signal generator 9 is connected to a cylinder of the printing machine, in the illustrated embodiment on the forme cylinder of the last Arranged printing unit.
  • the image processing 4 detects the line-by-line image data sampled by the image pickup device 2 in conjunction with the signals from the signal generator 9 so that the image pixel-wise resolved by each print sheet is present. This image data can be compared with predetermined target data, whereupon it is then decidable which print image is considered faulty.
  • the image processing 4 are several arranged on a common Traverse 7 and arranged according to the print image distribution on the sheet alignable printing devices 8. As shown in FIG. 2, the number of printing devices 8 corresponds to the use 11 arranged on the printing sheet.
  • the printing devices 8 are laser printers, inkjet printers or otherwise formed printing devices, by means of which markings 13 provided at the present printing speed (FIG. attributed to the defective benefit can be applied to the substrate.
  • FIG. 2 illustrates the invention in a schematic diagram.
  • the printing sheet 10 located on the unillustrated impression cylinder 1 (FIG. 1) has five columns, viewed in the printing direction, in which the inserts 11 are arranged.
  • the printing direction (direction of movement) of the printed sheet 10 is indicated by the arrow.
  • the dotted line reproduces the scanning line 12 on the printing sheet 10, by means of which the image recording device 2 designed as a line camera scans the sheet 10.
  • the adjustable on the common cross member 7 pressure devices 8 are adjusted according to the distribution of the benefits 11.
  • the image data of the sheet 10 taken by the image pickup device 2 is used in the image processing 4 compared with target data and analyzed the individual benefits in terms of print quality.
  • the image processing 4 now controls the individual printing devices in conjunction with the signals of the signal generator 9 in such a way that the utility 11 recognized as defective is provided with a marking 13 on the sheet 10.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Ink Jet (AREA)
  • Facsimiles In General (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

Printer has line scan camera [2] to monitor printed labels for defects in printing, tears or oil drops on paper etc. Ink jet, laser or number print head [8] coupled to controller [4] marks label at location of defect, so label will be discarded in later process step. Link to signal generator [9] causes line scan camera [2] to be activated to monitor print on sheet.

Description

Die Erfindung betrifft ein Bildinspektionssystem für eine Druckmaschine gemäß dem Oberbegriff von Anspruch 1.The invention relates to an image inspection system for a printing press according to the preamble of claim 1.

[Stand der Technik][State of the art]

Bei Bogenoffsetdruckmaschine erfolgt die Beurteilung der Druckqualität durch Ziehen eines Probebogens, der dann auf ein Extrapult aufgelegt und visuell und/oder messtechnisch erfasst und ausgewertet wird. Eine derartige Qualitätsbeurteilung ist jedoch lediglich eine Stichprobe, so dass eine langsame Änderung der Qualität unter Umständen erst nach einer großen Zeitspanne bemerkt wird, in der dann entsprechend viel Makulatur anfällt. Auch lassen sich durch Probebogen zufällig auftretende Qualitätsdefekte, beispielsweise verursacht durch Ölspritzer, Butzen oder Kratzer, nur schwer erfassen. Dementsprechend ist nicht zu verhindern, dass entsprechend viel unbemerkte Makulatur in der Auslage landet, die dann vor der Weiterverarbeitung durch entsprechende Arbeitsschritte wieder aussortiert werden muss.In the case of a sheet-fed offset printing press, the evaluation of the print quality is carried out by drawing a test sheet, which is then placed on an extra pile and recorded and evaluated visually and / or metrologically. However, such a quality assessment is only a sample, so that a slow change in quality may not be noticed until after a long period of time, which then results in a corresponding amount of waste. Also can be detected by sample sheet random quality defects, for example, caused by oil spills, slugs or scratches, difficult to grasp. Accordingly, it can not be prevented that a corresponding amount of unnoticed waste landed in the display, which then has to be sorted out before further processing by appropriate steps.

Eine permanente Qualitätsüberwachung ist bei Druckmaschinen möglich, wenn insbesondere nach dem letzten Druckwerk eine Bildaufnahmeeinrichtung in Form einer Kamera nebst Bildverarbeitung angeordnet ist. Derartige Bildinspektionssysteme sind beispielsweise aus der EP 1 190 855 A1 und der EP 0 884 182 B1 bekannt. Die durch die Bildaufnahmeeinrichtung gewonnenen Bilddaten werden pixelweise mit vorgegebenen Sollwerten verglichen, woraufhin dann bei Abweichungen von Sollwerten entweder Warnhinweise ausgegeben oder korrigierend auf den Druckprozess eingegriffen wird.Permanent quality monitoring is possible with printing machines if, in particular after the last printing unit, an image recording device in the form of a camera together with image processing is arranged. Such image inspection systems are known for example from EP 1 190 855 A1 and EP 0 884 182 B1. The image data obtained by the image recording device are compared pixel by pixel with predetermined setpoint values, whereupon, in the event of deviations from setpoint values, either warnings are issued or the printing process is intervened in a corrective manner.

Mit den bekannten Bildinspektionssystemen ist es ebenfalls möglich, die Bogen entsprechend der Druckqualität auf verschiedenen Stapeln abzulegen. So wird Makulatur automatisch ausgesondert und der Weiterverarbeitung nicht zugeführt.With the known image inspection systems, it is also possible to deposit the sheets according to the print quality on different stacks. Thus waste is automatically separated out and not sent for further processing.

Gerade Druckbogen die in Vielfachnutzen bedruckt werden, z.B. Etiketten für Flaschen, Faltschachteln, würde eine fehlerhafte Bildstelle in einem Nutzen den ganzen Bogen zu Makulatur machen. Die übrigen fehlerfreien Nutzen, welche durchaus weiter verarbeitet werden könnten, wären bei einer derartigen Bewertung ebenfalls Ausschuss.Straight sheets which are printed in multiples, e.g. Labels for bottles, cartons, would make a faulty image in one use the whole sheet to waste. The other error-free benefits, which could certainly be further processed, would also be rejected in such an evaluation.

Aus der EP 1 167 034 A2 sind ein Verfahren und eine entsprechende Vorrichtung zur Identifikation von bogenförmigen Objekten bekannt. Hierin ist eine Einrichtung zur vor- und rückseitigen Bogeninspektion vorgesehen, die einer Bogendruckmaschine nachgeordnet und deren Ausleger vorgeordnet ist. Den Einrichtungen zur Bogeninspektion ist weiterhin eine Druckeinrichtung nachgeordnet, mittels derer Markierungen zur Informationen über die Qualifizierung von fehlerfreien oder fehlerbehafteten Druckbogen auf den Rand der Druckbogen aufdruckbar sind. Weiterhin können die Druckbogen in dem Ausleger auf einen Stapel mit fehlerfreien oder mit fehlerbehafteten Druckbogen abgelegt werden.From EP 1 167 034 A2 a method and a corresponding device for the identification of arched objects are known. Herein, a device for front and back sheet inspection is provided, which is arranged downstream of a sheet-fed printing machine and the boom is upstream. The devices for sheet inspection is also followed by a printing device by means of which markers for information on the qualification of error-free or faulty printed sheet can be imprinted on the edge of the sheet. Furthermore, the printed sheets can be stored in the boom on a stack with error-free or with faulty printed sheet.

Dies zu verhindern schlägt die DE 200 10 920 U1 vor, aus den Bildsignalen der Bildaufnahmeeinrichtung die fehlerfreien Nutzen zu ermitteln und demzufolge die zu druckende Auflage anhand der fehlerfrei gedruckten Nutzen festzulegen. In der Weiterverarbeitung, z.B. beim Ausstanzen der Etiketten oder Faltschachteln, müssen dann die fehlerfreien Nutzen aber wiederum durch entsprechende Vorrichtungen erkannt werden.To prevent this DE 200 10 920 U1 proposes to determine the error-free benefits from the image signals of the image recording device and consequently to determine the edition to be printed on the basis of the error-free printed benefits. In further processing, for example when punching out the labels or folding boxes, then the error-free benefits must be recognized in turn by appropriate devices.

Aus der DE 39 38 138 C2 ist eine Vorrichtung zur Qualitätssicherung des Auflagendruckes an einer Bogendruckmaschine bekannt, bei welcher die eine Stichprobe ergebenden Probebogen im Bereich der Anlage mit einer Markierung versehen werden. Diese Bogen werden dann nach dem Bedrucken an der Auslage mittels eines Streifeninserters im Stapel gekennzeichnet, zusätzlich ertönt ein optisches und/oder akustisches Signal, so dass diese Bogen von Hand entnommen werden können. Über die Verteilung der Stichprobe wird ein Protokoll erstellt, so dass die Qualitätssicherung über den Auflagendruck dokumentiert ist.From DE 39 38 138 C2 a device for quality assurance of the print run on a sheet-fed printing machine is known, in which the sample sample resulting sheet in the area are provided with a marker. These sheets are then marked after printing on the display by means of a Streifeninserters in the stack, in addition sounds an optical and / or acoustic signal, so that these sheets can be removed by hand. A report is drawn up about the distribution of the sample, so that the quality assurance is documented by the edition print.

[Aufgabe der Erfindung]OBJECT OF THE INVENTION

Aufgabe der vorliegenden Erfindung ist es daher, ein Bildinspektionssystem für eine Druckmaschine derartig zu erweitern, so dass die durch die Bildverarbeitung gewonnenen Informationen in einfacher Weise auch nach dem Druck verwertbar sind.The object of the present invention is therefore to expand an image inspection system for a printing press in such a way that the information obtained by the image processing can be utilized in a simple manner even after printing.

Gelöst wird diese Aufgabe durch die Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This task is solved by the features of claims 1. Further developments of the invention will become apparent from the dependent claims.

[Beispiele][Examples]

Gemäß der Erfindung ist vorgesehen, dass, bezogen auf den Weg des Bedruckstoffes, der Bildaufnahmeeinrichtung eine Druckeinrichtung nachgeschaltet ist, vermittels der an vorgesehenen Stellen auf dem Bedruckstoff Markierungen erzeugbar sind.According to the invention, it is provided that, based on the path of the printing material, the image recording device, a printing device is connected downstream, by means of which at designated locations on the substrate markings can be generated.

Durch die erfindungsgemäße Einrichtung ist es möglich, mittels der Bildverarbeitung auf dem Bedruckstoff als fehlerhaft festgestellte Bereiche zu kennzeichnen, so dass diese dann in der Weiterverarbeitung entweder von einer Bedienperson oder einem weiteren Bildinspektionssystem erkannt werden können. So sind in einfacher Weise geeignete Maßnahmen einzuleiten, Makulatur kann ausgeschleust werden bzw. die fehlerhaften Bereiche werden vom übrigen Bedruckstoff getrennt.By means of the device according to the invention, it is possible to mark areas identified as defective by means of the image processing on the printing material, so that these can then be recognized in the further processing either by an operator or a further image inspection system. Thus, appropriate measures can be taken in a simple manner, waste can be discharged or the defective areas are separated from the rest of the substrate.

Bei der der Bildaufnahmeeinrichtung nachgeordneten Druckeinrichtung kann sich vorzugsweise um einen Tintenstrahldrucker, um eine Laserdruckeinrichtung oder um eine Eindruckvorrichtung handeln, wie sie vorzugsweise zum Nummerieren verwendet werden. Die vorgesehenen Stellen auf dem Bedruckstoff kennzeichnenden Markierungen können als Striche, Pfeile oder als Farbflächen ausgebildet sein. Ist in der Weiterverarbeitung eine automatische Kennung vorgesehen, so werden die durch die erfindungsgemäß vorgesehene Druckeinrichtung aufgeprägten Markierungen entsprechend gestaltet.The printing device arranged downstream of the image recording device can preferably be an inkjet printer, a laser printing device or an imprinting device, as they are preferably used for numbering. The intended locations on the substrate characterizing markings may be formed as dashes, arrows or colored areas. If an automatic identifier is provided in the further processing, the markings impressed by the printing device provided according to the invention are designed accordingly.

Mit der erfindungsgemäß vorgesehenen und der Bildverarbeitung nachgeschalteten Druckvorrichtung lassen sich beispielsweise als fehlerhaft erkannte Bildstellen kennzeichnen. Dies können insbesondere Farb- und/oder Ölspritzer, Kratzer in der Druckoberfläche oder durch Butzen verursachte Bildfehler sein. Gerade sehr kleine und nur sehr schwer erkennbare Bildfehlstellen werden so durch die Markierung hervorgehoben, so dass die entsprechenden Bogen von einer Bedienperson leicht erkannt und entnommen bzw. in der Weiterverarbeitung durch eine Automatisierung ausgeschleust werden können.By means of the printing device provided according to the invention and connected downstream of the image processing, it is possible to identify, for example, defective image locations. This can be in particular color and / or oil splashes, scratches in the printing surface or caused by slips artifacts. Especially very small and very difficult to recognize image defects are highlighted by the marker, so that the corresponding sheet can be easily recognized and removed by an operator or removed in the processing by automation.

Vorteilhaft gestaltet sich der Einsatz der Erfindung im Druck von Vielfachnutzen. Beim Etikettendruck werden eine Vielzahl von Etiketten auf einem Druckbogen so platziert, so dass sich eine größtmögliche Anzahl ergibt. Werden nun durch die Bildaufnahmevorrichtung sowie Bildverarbeitung an einem oder mehreren der Etiketten Fehlstellen erkannt, so können über die nachgeschaltete Druckeinrichtungen diese ein oder mehreren fehlerhaften Etiketten markiert werden.Advantageously, the use of the invention in the printing of multiple uses designed. In label printing, a large number of labels are placed on a printed sheet in such a way that the largest possible number results. If defects are now detected by the image recording device and image processing on one or more of the labels, then one or more defective labels can be marked via the downstream printing devices.

Bei einer mit einer Bildaufnahme sowie Bildverarbeitung versehenen Stanz- oder Falzeinrichtung zum Stanzen/Falzen der Etiketten können dann die als fehlerhaft markierten Etiketten ausgeschleust und so von den korrekt bedruckten, fehlerfreien getrennt werden. Weiterverarbeitung von Makulatur wird somit vermieden, zusätzliche Einrichtungen zur Qualitätssicherung können entfallen.In a provided with an image recording and image processing punching or folding device for punching / folding of the labels then marked as defective labels can be ejected and separated from the correctly printed, error-free. Further processing of waste paper is thus avoided and additional facilities for quality assurance can be omitted.

Anstelle einer für das menschliche Auge sichtbaren Markierung kann auch vorgesehen sein, die als fehlerhaft erkannten Bildstellen, Nutzen mit einer unsichtbaren Markierung zu versehen. Dazu wird ein Spektralbereich für Farbe und Beleuchtung gewählt, der außerhalb der menschlichen Wahrnehmung liegt. Eine Kontrolleinrichtung in der Weiterverarbeitung - z.B. eine automatische Klebelaschenkontrolle der Faltschachtelherstellung - ist entsprechend an diese spektrale Situation angepasst.Instead of a mark visible to the human eye, it may also be provided to provide the image areas identified as defective with an invisible marking. For this purpose, a spectral range for color and lighting is chosen, which lies outside the human perception. A control device in the further processing - for example, an automatic adhesive flap control of folding carton production - is adapted accordingly to this spectral situation.

Des weiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung anhand der Zeichnung. Es zeigt:

Fig. 1
die Anordnung der erfindungsgemäßen Druckeinrichtung bei einer Bogenoffsetdruckmaschine, und
Fig. 2
die erfindungsgemäße Markierung der Druckbogen in einer Prinzipdarstellung.
Furthermore, the explanation of an embodiment of the invention with reference to the drawing. It shows:
Fig. 1
the arrangement of the printing device according to the invention in a sheet-fed offset printing machine, and
Fig. 2
the marking of the printing sheet according to the invention in a schematic representation.

Figur 1 zeigt das letzte Druckwerk einer Bogenoffsetdruckmaschine mit einer diesem Druckwerk nachgeordnetem und dem Ausleger vorgeordneten Verlängerungseinrichtung. Die in den nicht dargestellten vorderen Druckwerken bedruckten Bogen werden über den Gegendruckzylinder 1 des letzten Druckwerkes gefördert und bedruckt. Die Bogen werden dann vom Gegendruckzylinder 1 über eine Transfertrommel 5 an einen Zylinder 6 übergeben, von dem aus dann die Übergabe an das Kettensystem des Auslegers (Auslegertrommel) erfolgt. Schließlich werden die Bogen dann auf dem dargestellten Auslegerstapel abgelegt.FIG. 1 shows the last printing unit of a sheet-fed offset printing machine with an extension device arranged downstream of this printing unit and extending in front of the delivery arm. The printed in the front printing units, not shown, are conveyed and printed on the impression cylinder 1 of the last printing unit. The sheets are then transferred from the impression cylinder 1 via a transfer drum 5 to a cylinder 6, from which then the transfer to the chain system of the boom (delivery drum) takes place. Finally, the sheets are then deposited on the illustrated delivery pile.

Dem Gegendruckzylinder 1 des letzten Druckwerkes ist eine als Zeilenkamera ausgebildete Bildaufnahmeeinrichtung 2 zugeordnet. Die Ausleuchtung des durch die Zeilenkamera 2 erfassten Bildstelle des Bogens erfolgt durch eine als Leuchtstofflampe ausgebildeten Beleuchtungseinrichtung 3. Der Bildaufnahmeeinrichtung 2 ist eine Bildverarbeitung 4 nachgeschaltet. Die Bildverarbeitung 4 steht dabei zusätzlich mit einem vorzugsweise als Winkelgeber ausgebildeten Signalgeber 9 in Verbindung, durch welchen die Bewegung des Bedruckstoffes auf der Oberfläche des Gegendruckzylinders 1 erfassbar ist. Der Signalgeber 9 ist an einem Zylinder der Druckmaschine, im gezeigten Ausführungsbeispiel am Formzylinder des letzten Druckwerkes angeordnet. Die Bildverarbeitung 4 erfasst die durch die Bildaufnahmeeinrichtung 2 gelieferten zeilenweise abgetasteten Bilddaten in Verbindung mit den Signalen des Signalgebers 9, so das von jedem Druckbogen pixelweise aufgelöstes Bild vorliegt. Diese Bilddaten können mit vorgegebenen Solldaten verglichen werden, woraufhin dann entscheidbar ist, welche Druckbildstellen als fehlerhaft anzusehen ist.The impression cylinder 1 of the last printing unit is assigned a trained as a line camera image pickup device 2. The illumination of the image point of the arc detected by the line camera 2 is effected by means of a lighting device 3 embodied as a fluorescent lamp. The image recording device 2 is followed by an image processing 4. The image processing 4 is additionally connected to a signal transmitter 9, preferably designed as an angle transmitter, by means of which the movement of the printing material on the surface of the impression cylinder 1 can be detected. The signal generator 9 is connected to a cylinder of the printing machine, in the illustrated embodiment on the forme cylinder of the last Arranged printing unit. The image processing 4 detects the line-by-line image data sampled by the image pickup device 2 in conjunction with the signals from the signal generator 9 so that the image pixel-wise resolved by each print sheet is present. This image data can be compared with predetermined target data, whereupon it is then decidable which print image is considered faulty.

Der Bildverarbeitung 4 sind mehrere an einer gemeinsamen Traverse 7 angebrachte und entsprechend der Druckbildverteilung auf den Bogen ausrichtbare Druckeinrichtungen 8 angeordnet. Wie in Figur 2 dargestellt, entspricht die Anzahl der Druckeinrichtungen 8 den auf den Druckbogen angeordneten Nutzen 11. Bei den Druckeinrichtungen 8 handelt es sich um Laserdrucker, Tintenstrahldrucker oder sonst wie ausgebildete Druckeinrichtungen, vermittels denen bei der vorliegenden Druckgeschwindigkeit vorgesehene Markierungen 13 (Figur 2) den fehlerhaften Nutzen zugeordnet auf dem Bedruckstoff aufbringbar sind.The image processing 4 are several arranged on a common Traverse 7 and arranged according to the print image distribution on the sheet alignable printing devices 8. As shown in FIG. 2, the number of printing devices 8 corresponds to the use 11 arranged on the printing sheet. The printing devices 8 are laser printers, inkjet printers or otherwise formed printing devices, by means of which markings 13 provided at the present printing speed (FIG. attributed to the defective benefit can be applied to the substrate.

Figur 2 verdeutlicht die Erfindung in einer Prinzipdarstellung. Der auf dem nicht dargestellten Gegendruckzylinder 1 (Figur 1) befindliche Druckbogen 10 weist in Druckrichtung betrachtet fünf Spalten auf, in welchem die Nutzen 11 angeordnet sind. Die Druckrichtung (Bewegungsrichtung) des Druckbogens 10 ist durch den Pfeil angedeutet. Mit der punktierten Linie ist die Abtastzeile 12 auf dem Druckbogen 10 wiedergegeben, vermittels der die als Zeilenkamera ausgebildete Bildaufnahmeeinrichtung 2 den Bogen 10 abtastet.Figure 2 illustrates the invention in a schematic diagram. The printing sheet 10 located on the unillustrated impression cylinder 1 (FIG. 1) has five columns, viewed in the printing direction, in which the inserts 11 are arranged. The printing direction (direction of movement) of the printed sheet 10 is indicated by the arrow. The dotted line reproduces the scanning line 12 on the printing sheet 10, by means of which the image recording device 2 designed as a line camera scans the sheet 10.

Die auf der gemeinsamen Traverse 7 einstellbar angeordneten Druckeinrichtungen 8 sind entsprechend der Verteilung der Nutzen 11 justiert. Die durch Bildaufnahmeeinrichtung 2 aufgenommenen Bilddaten des Bogens 10 werden in der Bildverarbeitung 4 mit Solldaten verglichen und die einzelnen Nutzen dabei hinsichtlich Druckqualität analysiert. Die Bildverarbeitung 4 steuert nun die einzelnen Druckeinrichtungen in Verbindung mit den Signalen des Signalgebers 9 so an, dass die als fehlerhaft erkannten Nutzen 11 auf dem Bogen 10 mit einer Markierung 13 versehen werden. So ist das Ausschleusen dieser fehlerhaft gedruckten Nutzen in einer entsprechend ausgebildeten Einrichtung der Weiterverarbeitung in einfacher Weise möglich.The adjustable on the common cross member 7 pressure devices 8 are adjusted according to the distribution of the benefits 11. The image data of the sheet 10 taken by the image pickup device 2 is used in the image processing 4 compared with target data and analyzed the individual benefits in terms of print quality. The image processing 4 now controls the individual printing devices in conjunction with the signals of the signal generator 9 in such a way that the utility 11 recognized as defective is provided with a marking 13 on the sheet 10. Thus, the removal of these incorrectly printed benefits in a suitably trained means of further processing in a simple manner possible.

[Bezugszeichenliste][REFERENCE LIST]

11
GegendruckzylinderImpression cylinder
22
Bildaufnahmeeinrichtung (Zeilenkamera)Image recording device (line scan camera)
33
Beleuchtunglighting
44
Bildverarbeitungimage processing
55
ÜbergabetrommelTransfer drum
66
Zylindercylinder
77
Traversetraverse
88th
Druckeinrichtungprint Setup
99
Signalgebersignaler
1010
Bogenbow
1111
NutzenUse
1212
Abtastlinie (Zeilenkamera)Scan line (line scan camera)
1313
Markierungmark

Claims (8)

  1. Image inspection system for a printing press, in particular a sheet-fed offset printing press, in which a printing material (10) which is printed with a multiplicity of copies (11) is detected by an image recording device (2) and the obtained image signals are processed in an image processing means (4) which is connected behind it, a printing device (8) which can be actuated in accordance with the image signals being arranged behind the image recording device (2), it being possible for markings (13) to be produced at provided locations of the printing material (10) by the said printing device (8), and the printing device (8) being arranged ahead of a deliverer of the printing press, characterized in that a plurality of printing devices (8) are provided which are arranged such that they can be adjusted in accordance with the distribution of the multiple copies (11).
  2. Image inspection device according to Claim 1, characterized in that the printing devices (8) are configured as an inkjet printing system.
  3. Image inspection system according to Claim 1, characterized in that the printing devices (8) are configured as a laser printing system.
  4. Image inspection system according to Claim 1, characterized in that the printing devices (8) are configured as a numbering system.
  5. Image inspection system according to Claim 1, characterized in that the printing devices (8) are arranged adjustably on a common crossmember (7).
  6. Image inspection system according to Claim 1, characterized in that the printing devices (8) are arranged behind the impression cylinder (1) of the last printing unit and are arranged ahead of the deliverer of the sheet-fed printing press.
  7. Image inspection system according to one of the preceding claims, characterized in that a visible marking can be produced on the printing material by the printing devices (8).
  8. Image inspection system according to one of Claims 1 to 6, characterized in that an invisible marking can be produced on the printing material by the printing devices (8).
EP04003728A 2003-03-06 2004-02-19 Image inspection system for a printing press Revoked EP1454746B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20303574U 2003-03-06
DE20303574U DE20303574U1 (en) 2003-03-06 2003-03-06 Image inspection system for a printing press

Publications (2)

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EP1454746A1 EP1454746A1 (en) 2004-09-08
EP1454746B1 true EP1454746B1 (en) 2006-11-22

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EP (1) EP1454746B1 (en)
JP (1) JP4272561B2 (en)
AT (1) ATE345933T1 (en)
DE (2) DE20303574U1 (en)

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DE502004002044D1 (en) 2007-01-04
JP2004268584A (en) 2004-09-30
ATE345933T1 (en) 2006-12-15
EP1454746A1 (en) 2004-09-08
JP4272561B2 (en) 2009-06-03
DE20303574U1 (en) 2003-04-30

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