EP4045325A1 - Verfahren zum automatischen fehlermanagement an einer druckmaschine - Google Patents
Verfahren zum automatischen fehlermanagement an einer druckmaschineInfo
- Publication number
- EP4045325A1 EP4045325A1 EP20792963.9A EP20792963A EP4045325A1 EP 4045325 A1 EP4045325 A1 EP 4045325A1 EP 20792963 A EP20792963 A EP 20792963A EP 4045325 A1 EP4045325 A1 EP 4045325A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inspection
- print image
- control unit
- image
- camera
- 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.)
- Pending
Links
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
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
- H04N1/6036—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis involving periodic tests or tests during use of the machine
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
- H04N1/6047—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis wherein the test pattern is part of an arbitrary user image
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0009—Central control units
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/02—Arrangements of indicating devices, e.g. counters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F5/00—Rotary letterpress machines
- B41F5/04—Rotary letterpress machines for printing on webs
- B41F5/16—Rotary letterpress machines for printing on webs for multicolour printing
- B41F5/18—Rotary letterpress machines for printing on webs for multicolour printing using one impression cylinder co-operating with several forme cylinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F5/00—Rotary letterpress machines
- B41F5/24—Rotary letterpress machines for flexographic printing
Definitions
- the invention relates to a method for automatic error management on a printing machine, in which a repetitive print image is printed on a moving web of material.
- error management refers to the entirety of the actions with which printing errors are dealt with on the printing press during the printing process.
- error detection i.e. the determination that an error has occurred
- error diagnosis i.e. the assignment to a specific cause
- actual resolution of the error i.e. the resolution of the error.
- So-called inspection systems are used to carry out error management on a printing press. Such inspection systems are basically set up so that the operator can observe and monitor the print image as a still image on a monitor while the printing process is running.
- the print image is usually recorded with a line camera.
- the line camera In contrast to an area camera, the line camera only ever records a single line of images, since in this way a higher resolution and a higher readout speed can be achieved compared to an area camera.
- the two-dimensional image is then created due to the movement of the belt. However, since this movement is subject to constant fluctuations, the feed is synchronized with the help of an encoder so that no image distortion occurs.
- the inspection system can also be equipped with a surface camera (other designation: matrix camera) which records a section of the printed image on the moving material web.
- a surface camera other designation: matrix camera
- the synchronization of the area scan camera with the repetitive print image ensures that the operator is shown a stationary image on a monitor in the control room, which shows the selected section of the print image.
- the selected section is preferably a prominent area of the print image in which printing errors have a particularly strong effect.
- the matrix camera can typically be zoomed so that faulty or problematic areas of the print image can be examined with high resolution. If the operator detects printing errors in the section shown (for example, errors in the color tone or register errors), he can readjust the machine parameters (for example the printing position, the longitudinal register or the side register) in order to correct the printing errors.
- the inspection system can also be equipped with an optical spectrometer.
- An optical spectrometer breaks down the light picked up by a point of light into its spectral components and evaluates the result in a computer system.
- Miniature spectrometers which are built into a compact housing and which can be placed in a suitable location within the printing machine, are particularly suitable for the applications presented here.
- Such miniature spectrometers usually consist of an aperture (ie an entrance slit), an optical grating and an optical sensor.
- the grating is located behind the aperture and scatters the spectral components of the incident light at slightly different angles, so that the scattered light can be evaluated by the optical sensor as light intensity over the wavelength of the respective light components.
- the color components of an image point within the print image can thus be monitored during the printing process and deviations from a desired color result can be determined.
- the positions of the errors detected by the operator on the moving material web are stored in the inspection system. After completion of the printing process, it is then possible, for example with the help of a rewinder, to approach the defective area of the printed material web and separate it. It is also possible for the defective areas on the material web to be marked during printing and only then removed during subsequent processing.
- error detection algorithms are also known which automatically detect certain errors in the print image and subsequently support the operator in performing his tasks.
- an error detection algorithm can be based on a reference image that is recorded at the beginning of the print job.
- the reference image can for example be recorded at the beginning of the printing process on the basis of the first print images (for example the first 50 images) with the line camera, the area camera and / or the optical spectrometer, these first images for creating the reference image (also called "golden image") be integrated.
- the integration phase for example, the fluctuation range of the image information can be determined for each individual pixel, so that tolerance limits for error detection can be set.
- the currently recorded image is then subtracted from the reference image during the printing process. If the difference obtained is outside the error tolerances, an error signal is generated and the defective image area is displayed on the monitor of the control panel.
- the desired print result can alternatively or additionally also be specified by the so-called digital proof, which is provided by the prepress stage.
- the image provided by the inspection system is compared with the digital proof.
- the digital image processing techniques already described in connection with the reference image can also be used for this comparison.
- the object of the invention is therefore to improve the automatic fault management in existing inspection systems.
- Fig. 1 shows an overall view of the printing machine according to the invention using the example of a flexographic printing machine
- FIG. 2 shows a detailed view of FIG. 1 with a line camera and a moving material web
- FIG. 3 shows a detailed view of FIG. 1 with a zoomable area camera and a moving material web.
- FIG. 1 shows an overall view of the printing machine according to the invention using the example of a flexographic printing machine 101 with a camera 102, a prepress 103, a control unit 104 and a control station 106.
- the control unit is installed at position 105 of the flexographic printing machine 101 and is shown separately for the sake of clarity .
- the flexographic printing machine 101 is a so-called central cylinder machine and accordingly has a central cylinder 107 around which the eight inking units are arranged in a star shape.
- Each of these inking units has a printing roller, an anilox roller and a doctor blade chamber, which are each mounted on anchors on the machine side.
- the inking unit 108 is designated as an example.
- the material web 109 In order to print the material web 109, it is pulled off the material roll 111 in the unwinding station 110 and guided to the pressure roller 112 via several deflection rollers.
- the pressure roller 112 applies the material web 109 to the central cylinder 107 for further transport, so that the material web 109 is guided past the inking units and the intermediate inking unit dryers (not shown in detail) in precise register.
- the camera 102 is equipped in such a way that it can be operated by the control unit both as a line camera and as a zoomable area camera. To operate the camera 102, it is connected to the control unit 104 via the line 116. Alternatively, it is of course also possible for two separate cameras in the form of a line camera and an area camera to be provided, with the two cameras being able to be operated either together or individually.
- the monitor of the control station 106 is designed as a touchscreen, so that the operator can execute specific commands for controlling the flexographic printing machine 101 directly on the monitor, guided by a menu.
- a function switch is also provided on the touchscreen in the menu navigation of the control center, with the function switch being able to switch between at least a first function mode and a second function mode.
- the print image is recorded with a first inspection unit and forwarded to the control unit.
- the first inspection unit includes, inter alia, the camera 102, the camera 102 being operated as a line camera in the first functional mode.
- the first inspection unit also includes an inspection system for seamless web inspection. Another common designation for seamless web inspection is a "100% inspection", since 100% of the repetitive print images are recorded on the moving material web.
- the first inspection unit finally also includes an inspection system for error detection with a first error detection algorithm.
- an initial print image 118 composite file
- control unit 104 the prepress being connected to control unit 104 via line 117.
- the initial print image 118 is then compared with the actual print image recorded by the camera 102.
- FIG. 2 shows a detailed view of FIG. 1 with a line camera and a moving material web.
- the corresponding reference numerals from FIG. 1 have been adopted, so that reference is made to the description of FIG. 1 in this respect.
- the representation according to FIG. 2 corresponds to the first functional mode, so that the camera 102 is operated as a line camera which records the print image 201 without any gaps. Occasionally, however, there are also areas in the print image that cannot be optimally inspected in the first functional mode with the settings of the first inspection unit. This includes, for example, areas in the image that contain certain special colors, lacquers, patterns or the like.
- the operator can operate the function switch on the monitor of the control center 106 to interrupt the first function mode and to switch briefly to the second function mode.
- the control unit automatically executes all commands in order to switch to the second function mode.
- FIG. 3 shows a detailed view of FIG. 1 with a zoomable area camera and a moving material web.
- the corresponding reference symbols from FIG. 1 have been adopted, so that reference is made to the description of FIG. 1 in this respect.
- the illustration according to FIG. 3 corresponds to the second functional mode, so that the camera 102 is operated as a zoomable area camera.
- the print image is recorded with a second inspection unit and forwarded to the control unit.
- the second inspection unit also includes special settings that enable an optimal inspection of the aforementioned areas in the print image 301. Others can do this
- Lighting situations e.g. bright field instead of dark field
- special software filters e.g., the use of special software filters.
- the recorded images are saved by the control unit and can be viewed by the operator offline at a later point in time.
- control unit After a sufficient number of images have been recorded by the area scan camera, the control unit automatically switches back to the first functional mode for seamless web inspection. Alternatively, it is of course also possible for the change back to the first functional mode to be carried out at the instigation of the operator.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019128139.3A DE102019128139A1 (de) | 2019-10-17 | 2019-10-17 | Verfahren zum automatischen Fehlermanagement an einer Druckmaschine |
| PCT/EP2020/078831 WO2021074183A1 (de) | 2019-10-17 | 2020-10-14 | Verfahren zum automatischen fehlermanagement an einer druckmaschine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4045325A1 true EP4045325A1 (de) | 2022-08-24 |
Family
ID=72915820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20792963.9A Pending EP4045325A1 (de) | 2019-10-17 | 2020-10-14 | Verfahren zum automatischen fehlermanagement an einer druckmaschine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12151463B2 (de) |
| EP (1) | EP4045325A1 (de) |
| DE (1) | DE102019128139A1 (de) |
| WO (1) | WO2021074183A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004052181B3 (de) * | 2004-07-23 | 2006-01-19 | Koenig & Bauer Ag | Verfahren zur Erkennung eines Bahnrisses einer in einer Rollendruckmaschine bedruckten Materialbahn |
| WO2006067117A1 (de) * | 2004-12-20 | 2006-06-29 | Koenig & Bauer Aktiengesellschaft | Vorrichtung zum ausbilden eines druckbildes an mindestens einer druckbildstelle |
| DE102005026127B4 (de) * | 2005-06-07 | 2007-02-08 | Koenig & Bauer Ag | Druckmaschine und ein Verfahren zur Herstellung eines Druckerzeugnisses |
| DE102007049192B4 (de) * | 2007-10-13 | 2011-12-29 | Windmöller & Hölscher Kg | Vorrichtung und Verfahren zum Transport einer bedruckten Materialbahn |
| DE202010008084U1 (de) | 2010-07-15 | 2011-10-21 | Eltromat Gmbh | Vorrichtung zur Überwachung des Druckergebnisses bei Rotationsdruckmaschinen |
| DE102011050733A1 (de) * | 2011-05-30 | 2012-12-06 | Eltromat Gmbh | Verfahren zur Steuerung eines Drucklaufes in einer Rotationsdruckmaschine |
-
2019
- 2019-10-17 DE DE102019128139.3A patent/DE102019128139A1/de active Pending
-
2020
- 2020-10-14 US US17/769,082 patent/US12151463B2/en active Active
- 2020-10-14 WO PCT/EP2020/078831 patent/WO2021074183A1/de not_active Ceased
- 2020-10-14 EP EP20792963.9A patent/EP4045325A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20240100819A1 (en) | 2024-03-28 |
| WO2021074183A1 (de) | 2021-04-22 |
| US12151463B2 (en) | 2024-11-26 |
| DE102019128139A1 (de) | 2021-04-22 |
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Legal Events
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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