EP4240590A1 - Verfahren zum automatischen fehlermanagement an einer druckmaschine - Google Patents
Verfahren zum automatischen fehlermanagement an einer druckmaschineInfo
- Publication number
- EP4240590A1 EP4240590A1 EP21806702.3A EP21806702A EP4240590A1 EP 4240590 A1 EP4240590 A1 EP 4240590A1 EP 21806702 A EP21806702 A EP 21806702A EP 4240590 A1 EP4240590 A1 EP 4240590A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- printing
- printing machine
- camera
- error
- 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
- 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
- B41J11/0095—Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
- B41F19/007—Apparatus or machines for carrying out printing operations combined with other operations with selective printing mechanisms, e.g. ink-jet or thermal printers
-
- 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
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
-
- 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
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/04—Tripping devices or stop-motions
-
- 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
- B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
- B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
-
- 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
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2203/00—Embodiments of or processes related to the control of the printing process
- B41J2203/01—Inspecting a printed medium or a medium to be printed using a sensing device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8854—Grading and classifying of flaws
- G01N2021/888—Marking defects
Definitions
- the invention relates to a method for automatic error management on a printing press, in which a repetitive print image is printed on a running web of material.
- the invention also relates to a printing press with a system for automatic error management for printing a running material web with a repetitive print image.
- error management refers to the entirety of the actions with which printing errors on the printing machine are handled during the printing process. Error management usually consists of three phases, namely error detection (i.e. determining that an error is present), error diagnosis (i.e. assignment to a specific cause) and the actual error correction.
- automatic error management in this context means that the operator of the printing press is automatically supported in all three phases of error management. Ideally, the automatic error management even automatically takes over all actions that are required in relation to a specific error on the printing press.
- So-called inspection systems are used to carry out error management on a printing press. If a repetitive print image is printed on a running web of material, such inspection systems are basically set up so that the operator can observe and monitor the print image as a stationary image on a monitor during the ongoing printing process.
- the print image is usually recorded with a line scan camera. In contrast to an area scan camera, the line scan camera only ever takes one individual image line, since in this way the entire print area can be recorded with high resolution and, at the same time, high web speed compared to an area scan camera.
- the two-dimensional image is then created due to the movement of the web. Since this movement is subject to constant fluctuations, the feed is also synchronized with the help of an encoder to prevent image distortions.
- the inspection system can also be equipped with an area camera (also known as a matrix camera), which records a section of the printed image on the moving web of material.
- an area camera also known as a matrix camera
- the operator is shown a stationary image on a monitor in the control station, which reproduces the selected section of the print image.
- the selected section is preferably a prominent area of the printed image in which printing errors have a particularly strong effect.
- the area scan camera is zoomable so that defective or problematic areas of the printed image can be examined with high resolution. If the operator detects printing errors in the displayed section (e.g. errors in color tone or register errors), he can readjust the machine parameters (e.g. the print 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 recorded light into its spectral components and evaluates the result in a computer system.
- Miniature spectrometers which are installed in a compact housing and can be placed at a suitable location within the printing press, are particularly suitable for the applications presented here.
- Such miniature spectrometers regularly 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 a pixel within the printed image can be monitored during the printing process and deviations from a desired color result can be determined.
- error detection algorithms are also known, which automatically detect certain errors in the printed image and then support the operator in further troubleshooting.
- an error detection algorithm can be based on a reference image captured 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 (e.g. the first 50 images) using the line scan camera, the area scan camera and/or the optical spectrometer, these first images being used to create the reference image (also called the "golden image"). to be integrated.
- the fluctuation range of the image information can be determined for each individual pixel so that tolerance limits for error detection can be defined.
- the currently recorded image is then subtracted from the reference image. If the difference obtained is outside the error tolerances, an error signal is generated and the defective image area is displayed on the control panel monitor.
- the desired print result can also be specified by the so-called digital proof, which is provided by the pre-press department.
- digital proof which is provided by the pre-press department.
- the image supplied 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 positions of the faults detected on the running web of material are stored in the inspection system in a so-called roll log. After completion of the printing process, it is then possible, for example with the help of a rewinder, to move to the defective area of the printed material web and cut it out. It is also possible that the defective areas on the material web are already marked during printing and then ejected in subsequent further processing.
- EP 3 132 936 A1 it is known from EP 3 132 936 A1 to provide the end of the material web with a label after the end of the printing process, which serves to define a zero mark when the tape is reinserted.
- a sensor detects the further processing machine the label as a zero mark. Since the distances between the individual printing errors are stored in the roll log, each printing error can be localized with reference to the zero mark.
- the object of the invention is therefore to improve the detection of printing errors on a printed web of material.
- the solution according to the invention consists of a printing machine with a system for automatic error management for printing a running material web with a repetitive print image, with a control unit, with a camera connected to the control unit for carrying out an inspection of the printed material web to detect printing errors, with a web marking unit for applying web markings to the running material web, and with a function switch for releasing the web marking unit, with a web marking being applied to the material web by the web marking unit as soon as a printing error has been detected by the control unit and the web marking unit has been released by the operator.
- the solution according to the invention consists of a corresponding method for automatic error management on a printing press, in which a repetitive print image is printed on a running material web, in which a control unit and a camera connected to the control unit carry out an inspection of the printed material web to detect printing errors is carried out, in which a web marking unit for applying web markings to the running material web and a function switch for enabling the web marking unit are provided, with a web marking being applied to the material web by the web marking unit as soon as a printing error has been detected by the control unit and the web marking unit from has been released to the operator.
- An essential advantage of the solution according to the invention is that several web markings can also be applied to the running material web during the printing process, with the application of an uncontrolled number of markings being able to be avoided at the same time due to the existing function switch. Especially with so-called 100% inspection systems, it can happen that the inspection system detects a large number of errors within a very short time (e.g. if an inking unit fails). In such a case it is important that the operator is able to attribute the failure to a single mark on the web and that an uncontrolled number of marks are not automatically applied to the web because of the failure.
- the marking can consist of a bar code or a QR code, for example.
- the QR code (Quick Response) is a two-dimensional code that is described in EP 0672 994 A1, for example.
- the QR code consists of a square matrix with black and white squares that represent the encoded data in binary form. A special marking in three of the four corners of the square provides orientation.
- the data in the QR code is enhanced with an error-correcting code. This tolerates the loss of up to 30% of the code. Further developments are the micro QR code, the secure QR code (SQRC), the iQR code and the frame QR code.
- the marking is assigned further information in addition to the location of the error, for example the type of error, the relative distance of the error to the marking, the extent of the error in running meters and/or other remarks or comments by the operator .
- a first marking could mark the beginning of the error using appropriate information, and another marking could mark the end in a corresponding manner. It is also possible for the information from a number of errors to be summarized on the marking.
- the information can be integrated as a whole in the QR code or it can also be stored in a separate database, in which case the QR code only contains the database entry for the relevant information.
- the camera consists of a line camera for seamless inspection.
- a zoomable area camera for the inspection of certain areas of the printed image.
- the solution according to the invention can in principle be used for all types of printing presses.
- Preferred applications are flexographic printing machines, gravure printing machines or digital printing machines.
- Flexographic printing machines and gravure printing machines are equipped with fixed printing forms, so that only the repetitive print image can be printed with these printing forms.
- digital printing machines on the other hand, it is possible to print both repetitive print images and changing motifs.
- the combination of repetitive print images and individual motifs is also possible. In practical terms, this means that with a digital printing machine, the web marking can be printed directly with the repetitive print image. If the track marking is a QR code, you do not need an additional QR printer, for example.
- 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 running material web in a first printing state
- FIG. 3 shows a detailed view of FIG. 1 with a line camera and a running material web in a second printing state.
- 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 stage 103, a control unit 104 and a control station 106.
- the control unit is installed at position 105 in the flexographic printing machine 101 and is separate for reasons of clarity shown.
- 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 pressure roller, a Anilox roller and a blade chamber, which are each mounted on machine-side anchors.
- 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 a plurality of deflection rollers.
- the pressure roller 112 applies the material web 109 to the central cylinder 107 for onward transport, so that the material web 109 is guided past the inking units and the intermediate inking unit dryers (not shown in more detail) with register accuracy.
- a web marking unit 121 which is designed here as a QR printer for optionally printing web markings in the form of QR codes.
- the material web 109 After leaving the QR printer 121, the material web 109 reaches the bridge dryer 113 for the printing ink to dry and is then wound up onto the material roll 115 in the winding station 114.
- the camera 102 is equipped in such a way that the control unit can operate it both as a line camera and as a zoomable area camera. In order 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 to be provided in the form of a line camera and an area camera, 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 menus.
- the prepress stage 103 transmits the digital proof to the control unit 104 via the line 117 in a data container 118.
- error detection algorithms run on the control unit 104, which detect printing errors due to target/actual print image deviations.
- the associated actions between the control unit 104 and the control center 106 are transmitted via the lines 119 and 120 and are described in more detail with reference to the following FIGS. 2 and 3.
- FIG. FIG. 2 shows a detailed view of FIG. 1 with a line camera and a running material web in a first printing state.
- the corresponding reference numbers from FIG. 1 have been adopted, so that reference is made to the description of FIG. 1 in this respect.
- reference numeral 201 designates a repetitive print image that is printed onto material web 107 by one or more inking units 108 .
- the print image 201 and the print error 202 are recorded by the camera 102 as an actual print image and forwarded to the control unit 104 via the line 116 .
- the actual print image is subjected to an error detection algorithm. If, as in this case, a printing error is detected, a function switch in the form of a software button is displayed on the control station 106, which is shown as a button 203 in FIG. At this point, the operator has the option of assessing the printing error and optionally adding additional information, such as remarks or comments.
- the QR printer 121 is activated and prints a QR code on the material web 107 to mark the printing error 202.
- the previously collected information on the printing error (position, type of error, comments on the operator, etc.) are saved as part of the QR code.
- a link is stored in the QR code, which, when called up, refers to the information on the printing error (position, error type, operator comments, etc.).
- FIG. 3 shows a detailed view of FIG. 1 with a line camera and a running material web in a second printing state.
- the corresponding reference symbols from FIGS. 1 and 2 have been adopted, so that reference is made to the description of FIGS. 1 and 2 in this respect.
- reference numeral 301 designates a subsequent print image compared to the first print state.
- reference numeral 302 shows a QR code which was printed by the QR printer 121 in the first printing state according to FIG. 2 and which now appears in the recorded image of the camera 102 .
- Position information between the typographical error 202 and the QR code 302 be detected automatically, since both the position of the printing error 202 and the position of the subsequent QR code can be detected with the camera 102 .
- the distance between printing error 201 and QR code 302 is not relevant for this assignment.
- the distance chosen by the operator should not be too great in order to avoid errors in recognition due to different web tensions and web elongations.
- the recognition then runs in reverse order.
- the QR code 302 is therefore first recognized by a QR code reader before the printing error 202 then appears on the unwound web of material.
- an action can then be started during further processing that was previously assigned to the printing error 202 in the roll log, such as ejecting the faulty section of the material web from further processing.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Quality & Reliability (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020129339.9A DE102020129339A1 (de) | 2020-11-06 | 2020-11-06 | Verfahren zum automatischen Fehlermanagement an einer Druckmaschine |
| PCT/EP2021/080731 WO2022096628A1 (de) | 2020-11-06 | 2021-11-05 | Verfahren zum automatischen fehlermanagement an einer druckmaschine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4240590A1 true EP4240590A1 (de) | 2023-09-13 |
Family
ID=78617400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21806702.3A Pending EP4240590A1 (de) | 2020-11-06 | 2021-11-05 | Verfahren zum automatischen fehlermanagement an einer druckmaschine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4240590A1 (de) |
| DE (1) | DE102020129339A1 (de) |
| WO (1) | WO2022096628A1 (de) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2938338B2 (ja) | 1994-03-14 | 1999-08-23 | 株式会社デンソー | 二次元コード |
| US6112658A (en) * | 1999-02-25 | 2000-09-05 | George Schmitt & Company, Inc. | Integrated and computer controlled printing press, inspection rewinder and die cutter system |
| DE19940879A1 (de) * | 1999-08-27 | 2001-03-08 | Innomess Elektronik Gmbh | Verfahren und Vorrichtung zum automatisierten Vergleich von Druckbildern an Druckmaschinen |
| DE202004014157U1 (de) * | 2004-09-09 | 2006-02-09 | Planatol Klebetechnik Gmbh | Markiereinrichtung |
| DE102005019533B4 (de) * | 2005-04-27 | 2021-03-18 | Koenig & Bauer Ag | Druckmaschine und Verfahren zum Betreiben der Druckmaschine zur Inline-Herstellung individualisierter Druckerzeugnisse |
| DE102007047180A1 (de) * | 2007-10-02 | 2009-04-09 | Manroland Ag | Rollendruckmaschine |
| DE102012106981A1 (de) * | 2012-07-31 | 2014-02-06 | Eltromat Gmbh | Verfahren zur Prüfung des Druckergebnisses bei Rotationsdruckmaschinen |
| DE102015112492B3 (de) | 2015-07-30 | 2016-06-23 | X-Label Gmbh | Verfahren zum automatischen Wiederauffinden von fehlerhaften Druckbildstellen eines bedruckten Bandes und zur Synchronisation der Bandförderung |
| ITUB20159538A1 (it) * | 2015-12-29 | 2017-06-29 | Grafikontrol S P A | Sistema per rilevare e tracciare difetti durante le fasi di lavorazione di materiali. |
-
2020
- 2020-11-06 DE DE102020129339.9A patent/DE102020129339A1/de active Pending
-
2021
- 2021-11-05 EP EP21806702.3A patent/EP4240590A1/de active Pending
- 2021-11-05 WO PCT/EP2021/080731 patent/WO2022096628A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022096628A1 (de) | 2022-05-12 |
| DE102020129339A1 (de) | 2022-05-12 |
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Owner name: WINDMOELLER & HOELSCHER SE & CO. KG |