EP2529932A1 - Verfahren zur Steuerung eines Drucklaufes in einer Rotationsdruckmaschine - Google Patents

Verfahren zur Steuerung eines Drucklaufes in einer Rotationsdruckmaschine Download PDF

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Publication number
EP2529932A1
EP2529932A1 EP12166607A EP12166607A EP2529932A1 EP 2529932 A1 EP2529932 A1 EP 2529932A1 EP 12166607 A EP12166607 A EP 12166607A EP 12166607 A EP12166607 A EP 12166607A EP 2529932 A1 EP2529932 A1 EP 2529932A1
Authority
EP
European Patent Office
Prior art keywords
image
web
errors
printed
print
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.)
Withdrawn
Application number
EP12166607A
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German (de)
English (en)
French (fr)
Inventor
Dirk Völlmecke
Dirk Volkening
Oliver Koltermann
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.)
Eltromat GmbH
Original Assignee
Eltromat GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eltromat GmbH filed Critical Eltromat GmbH
Publication of EP2529932A1 publication Critical patent/EP2529932A1/de
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/0036Devices for scanning or checking the printed matter for quality control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/02Arrangements of indicating devices, e.g. counters

Definitions

  • the invention relates to a method for controlling a print run for processing a print job in a rotary printing press, in which a printed web is continuously inspected with a camera system and errors in the print image are automatically detected by electronic evaluation of the image data supplied by the camera system.
  • the applicant has developed special inspection systems with which a complete image of the printed web can be recorded and stored digitally.
  • the image information is linked with position information indicating the location of the respective image area in the longitudinal direction of the web.
  • a control panel with a monitor makes it possible to call up the corresponding image for each desired point on the printed web and to inspect for errors. If non-tolerable errors are detected in the printed image, it is possible based on the stored position information, after completion of the printing process with the aid of a Umrollers start the defective area of the printed web and separated as a reject from the web.
  • Error detection algorithms have also been developed for automatic error detection. For this purpose, for example, at the beginning of the printing process, the first about 50 repeating print images (formats) digitally photographed with a line camera, and the image information is integrated over the 50 images, so that you get a reference image, the so-called "Golden Image” with the then the images taken later during the printing process will be compared. In the integration phase, the fluctuation range of the image information for each individual pixel can also be determined determine so that tolerance limits can be set for error detection. During the printing process, the currently recorded image is then subtracted from the reference image, and if the difference obtained is outside of the error tolerances, an error signal is generated and the defective image area is displayed on the monitor of the control panel.
  • the positions of the detected aberrations can be stored, so that the damaged areas in the printed web can be selectively examined after completion of the printing process and optionally removed.
  • the amount of printed web material that must be removed as broke after completion of the printing run is estimated in advance, and the production amount for printing run, that is, the total length of the printed web in fulfillment of the print job or the total number of printed formats calculated by adding the expected scrap to the actual demand.
  • the object of the invention is to reduce the material and time required for the production of a given amount of properly printed material.
  • This object is achieved in a method of the type mentioned in that the detected errors are still evaluated during the printing run as tolerable or as a committee and that the total length of the print run to fulfillment of the print job printed web is increased by the evaluated as scrap sheet length.
  • the amount of rejects that actually arises during the printing run already recorded during production and taken into account in determining the amount of product, so that the production is adapted to the actual amount of rejects.
  • This makes it possible to calculate the scrap very tightly before the start of the print run, or - ideally - not to bill for a scrap at all, so that the print run produces only the quantity that is really needed, taking into account the actual rejects. In this way, a considerable saving of material and time can be achieved.
  • evaluation algorithms are used which not only automatically recognize the errors in the printed image, but also automatically evaluate these errors on the basis of predetermined quality criteria as tolerable or reject, so that the actual amount of rejects can be determined automatically without human intervention.
  • the inspection system can also be used to alert the operator to detected faults so that they inspect the fault themselves and may, if necessary, take remedial action.
  • the machine operator can also correct the evaluation made automatically by the error detection algorithms. It is also possible to use self-learning algorithms in which the quality criteria are automatically adjusted taking into account the corrections made by the personnel.
  • the error detection algorithms are preferably arranged to automatically classify the detected errors into particular error groups. For example, a distinction can be made between stripe-shaped defects (horizontal or vertical stripes such as squeegee stripes), color errors, i. area variations in hue, registration errors and other disturbances that can not be classified as stripes, color errors or registration errors. In addition, a distinction can be made between sporadically occurring errors and regularly recurring errors, wherein the repetition interval for regularly recurring errors does not necessarily have to match the format length.
  • Different quality criteria can be specified for the different error groups, which determine whether an error is still tolerable or not.
  • a threshold for the contrast and / or the width of the strip may be specified.
  • threshold values for the extent of the affected image zone and / or the extent of the color deviation (distance in the color space) can be specified.
  • Register errors can be detected and evaluated by creating edge images for the various color components from the color image taken by the camera system and specifying limit values for the position deviations between the edges in the different color separations.
  • threshold values for the area affected and / or the density of the spatters can be defined.
  • thresholds are specified for a single error group, they may also be interdependent, so that, for example, a color aberration will tolerate a greater color deviation if only a relatively small area is affected, and vice versa.
  • the boundary between tolerable and intolerable errors can be specified in a multi-dimensional map, with the number of dimensions corresponding to the number of quality criteria.
  • the quality criteria may depend on the location of the error in question in the printed image. For example, splashes on a textured photo may be tolerated sooner than on a monochrome face or in a bar code. Conversely, when reproducing a company logo, for example, very high standards for color fidelity will apply. This can be taken into account by setting up different sets of quality criteria for different zones of the printed image. If necessary, less important parts of the printed image can also be completely masked, so that no error detection takes place here.
  • a section of a web 10 is shown, which has been printed in a rotary printing machine and is forwarded via various deflection and guide rollers 12 to a winding, not shown.
  • a digital line scan camera 14 is arranged on the printed side, which extends across the web 10 across its entire width and is capable of taking a complete color image of one line of the image printed on the web 10 at any one time.
  • the line scan camera 14 is connected to a powerful electronic data processing system 16 in a control panel 18 of the device.
  • the digital image data supplied by the line scan camera 14 are stored line by line so that a complete image of the printed web 10 can be recorded during the printing process.
  • the data processing system 16 also receives information from the control device of the printing press, in particular information about the web transport, which allows each area of the recorded and stored image to associate the associated longitudinal position on the web 10.
  • the data processing system 16 includes a powerful image processing system and software for automatic error detection.
  • Illumination systems for illuminating the image line recorded by the line scan camera 14 on the web 10 are integrated into the line scan camera 14.
  • a lighting device such as an LED line, also be arranged opposite to the line scan camera 14 on the back of the web 10, so that it is possible to record transparent webs also in transmitted light.
  • a matrix camera 20 which is adapted to photograph a rectangular section of the image printed on the web 10.
  • associated lighting devices are integrated directly into the camera.
  • the web 10 is printed in the rotary printing press with an image that repeats at certain intervals (the repeat), namely at least after each complete revolution of the printing rollers.
  • the matrix camera 20 is synchronized according to the stroboscopic principle so in the repeat, which is photographed in each digital single photo, which takes the matrix camera, the same image detail, so that one on a screen on which the successive recorded images are displayed, a still image receives.
  • the matrix camera 20 is movable on rails 22 in the transverse direction of the web 10, so that the transverse position of the photographed image detail can be varied. By changing the phase position of the image frequency relative to the repeat, the longitudinal position of the image detail can also be varied. Furthermore, the matrix camera 20 has an optical zoom, which makes it possible to zoom closer to the web 10, so that a smaller image detail with a correspondingly higher resolution can be observed.
  • the matrix camera 20 is at the heart of a web inspection system that serves to randomly monitor the result of the printing process while production is running, so that the operator can intervene at any time to correct any errors such as registration errors, hue changes, and the like.
  • the line camera 14 is the centerpiece of an inspection system which serves to inspect the printed web 10 in its entirety for any errors in the print image, so that defective areas can be separated from the web in a later step.
  • control panel 18 is an integrated control panel adapted to control both the inspection system (line scan camera 14) and the web inspection system (matrix camera 20) and to electronically evaluate and present the data provided by these systems to the operating personnel.
  • the control panel 18 has a touch-sensitive screen 24 on which either an image produced by the line scan camera 14, an image produced by the matrix camera 20, or combinations of such images can be displayed, along with representations of buttons for operating operations.
  • an additional monitor 26 is mounted on the control panel.
  • Fig. 2 shows an example of a display image displayed on the screen 24.
  • Keys 28 (softkeys) are shown at the bottom and at the right edge of the screen for the respective operating operations required, for example, for the selection of the picture display mode, for the positioning of the matrix camera 22, and the like.
  • the contents and locations of the keypads may vary dynamically depending on the function and operating state.
  • buttons for the adjustment of the longitudinal and side register, for the Druckbeinger, etc. of the printing machine may be provided.
  • an image detail is displayed in the example shown, which was selected for the web observation.
  • a smaller image 32 is displayed, which reproduces a portion of the web 10, as it is currently taken by the line scan camera 14, in full width.
  • the image printed on the web 10 consists in the example shown of four across the width of the web distributed benefits 34 with identical image content.
  • the web portion shown in image 32 has a length of two formats 36 (one format being the repeating image printed at each revolution of the printing cylinders).
  • a frame 38 in the small image 32 indicates the location and size of the image currently used for web viewing and displayed in the body of the image window 30.
  • either the line camera 14 or the matrix camera 20 can be used for the web observation.
  • the use of the line scan camera 14 has the advantage that the position of the image section changes rapidly can be because no camera elements need to be moved mechanically, but only the area of the recorded image needs to be electronically selected.
  • the line scan camera 14 also has a digital zoom which allows the selected image detail to be magnified, it is limited in resolving power since there is no optical zoom available.
  • the line scan camera 14 is used for web-watching.
  • the matrix camera 20 is ready for use, and the image section taken in the current state of the matrix camera 20 (with a low zoom level) is indicated in the small image 32 by a frame 40.
  • the print format has, for example, two particularly critical areas to which particular attention should be given during web observation, it is possible to align the image section (frame 38) observed by the line scan camera 14 with one of these areas and display the image detail (FIG. Frame 40) on the other, so that can be switched quickly in the web observation between the two sections without the need for mechanical components to be moved. It is also possible to reproduce several image sections simultaneously.
  • the matrix camera 20 for special tasks, for example for automatic quality monitoring of stationary motifs in the printed image, for which a particularly high quality is required, for example for company logos or bar codes on packaging.
  • the data stream delivered by this line scan camera is automatically divided into two sub-streams.
  • One of these sub-streams relates to the image detail selected for the web observation and is reproduced in the image window 30, while the other sub-stream comprises the image information for the entire width of the web 10 and is stored together with the corresponding position information.
  • the operator has chosen an operating mode in which the automatically detected errors are indicated only by suitable markings 42 in the small image 32. If the machine operator the If the user wants to interrupt the current path observation in order to inspect the error indicated by the mark 42, he merely has to tap the corresponding mark on the touch-sensitive screen 24 with his finger, and he receives an enlarged image of the defective area in the image window 30. If a particularly high Zoom level is desired, this detail image can also be generated by the matrix camera 20, which automatically moves to the relevant position.
  • Fig. 3 illustrates a situation in which the user has selected a playback mode in which the portion of the web 10 that is in Fig. 2 has been displayed in the small image 32, is now displayed as a full image in the image window 30, and in which the area marked by the mark 42 is additionally reproduced in high magnification as an "image in image" 44.
  • the matrix camera 20 is used, which is indicated by the frame 40 in the main picture.
  • the operator recognizes that the automatically detected error in the example shown is a squeegee strip 46. He can now try to remedy this error by appropriate countermeasures, for example by a cross-adjustment or vibration of the squeegee, and he can track the result on the screen 24. If the doctor blade 46 can not be removed, it may decide to stop printing to clean the doctor blade.
  • the errors detected in the automatic error detection are logged and stored as error images, so that the errors can be specifically inspected after completion of the print run on the control panel 18.
  • the control panel 18 can also be used to control the rewinder with which the defective areas which are to be separated out of the web 10 as rejects are brought to a corresponding position on a cutting table.
  • results of the automatic error detection are used to determine the amount of printed products (the total length of the printed web) produced in the current printing run.
  • FIG. 12 shows a portion of the printed web 10 extending over seven formats 36 with four benefits 34.
  • Three of the seven formats are defective because each of the utility 34 contains an error in the form of a doctor blade 46.
  • the error has been detected by the fault detection software and reported to the operator at the control panel 18. Furthermore, the error detection software has evaluated the error based on the width and the contrast of the squeegee strip and classified as intolerable. This classification is also communicated to the operator and possibly confirmed or modified by this.
  • the data processing system 16 then stores the information that the three consecutive formats containing the error are to be regarded as scrap 48 (in FIG Fig. 4 shaded). The corresponding position information is stored and later serves to control the rewinder, with which the committee is separated from the web 10. Also stored in the data processing system 16 is the information that the number of formats 36 to be total printed in this print run is increased by three to replace the loss incurred by the broke.
  • the production volume (number of printed formats) is again increased by the corresponding rejects, so that at the end of the printing cycle the rejects are completely compensated by a corresponding increase in production.
  • step S1 prior to the start of the printing run, the demand is entered, that is, the total length of the web 10 to be printed or the number of flawlessly printed formats 36, which is required in total.
  • step S2 data specifying a quality level is then input.
  • the errors can be distinguished by different error groups, for example color changes (clays), squeegee strips, extractors and spatters, and for each error group the quality level is specified by an associated set of parameters and corresponding thresholds. In this case, a different quality level can also be provided for different areas of the print image contained in each use 34.
  • step S3 the print run is then started and it is waited for a certain An horrphase in which the settings of the printing press are optimized.
  • a reference image is created which is needed for automatic error detection.
  • the images of 50 successive formats 36 are recorded by the line camera 14, stored and subjected to a statistical evaluation.
  • the color values for example in the three basic colors RGB
  • the mean values thus obtained then together form the reference image.
  • the scattering of the color values is determined and, depending on the scattering, tolerance limits are determined for each color value of each pixel, which delimit the range of normal statistical fluctuations from significant deviations which are to be regarded as errors.
  • step S5 an off-time is then calculated based on the demand indicated in step S1 and the production speed of the printing press (printed formats per second) at which the required number of formats are printed and the printing run is to be terminated.
  • the web inspection is carried out with the aid of the line camera 14 and the data processing system 16, possibly supplemented by a web observation with the aid of the matrix camera 20.
  • the images continuously recorded by the line scan camera 14 are compared with the reference image, ie a difference image is generated by subtracting the reference image from the currently captured image, and pixel by pixel is checked to see if the difference is outside the stored tolerance limits. If so, an error is detected and reported to the operator at the control panel 18.
  • the error is classified into one of the predefined error groups, and based on the quality criteria input in step S2, it is decided whether the error is tolerable or not. If necessary, the machine operator can intervene interactively in this decision-making process.
  • step S6 If an intolerable error is detected in a format inspected in this way, this format is recognized as reject (step S6). A return is then made to step S5, where the switch-off time is recalculated, in such a way that the rejection detected in step S6 is compensated by a corresponding increase in production. If no reject is detected in step S6, it is checked in step S7 whether the currently applicable switch-off time is reached. If not, the next printed format step S6 is repeated and the cycle of steps S6, S5 and S7 if necessary is repeated until the turn-off time is reached and the printing run is ended in step S8.
  • the number of printed formats then corresponds to the demand plus the scrap, which was detected in total during the current web inspection. Consequently, when entering the demand in step S1, no surcharge for expected scrap needs to be made, or at most a small allowance is made for scrap which is not recognized by the automatic web inspection.
  • the detection of the reject occurs in a format-wise manner.
  • the calculation and compensation of the reject may also be beneficial.
EP12166607A 2011-05-30 2012-05-03 Verfahren zur Steuerung eines Drucklaufes in einer Rotationsdruckmaschine Withdrawn EP2529932A1 (de)

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DE201110050733 DE102011050733A1 (de) 2011-05-30 2011-05-30 Verfahren zur Steuerung eines Drucklaufes in einer Rotationsdruckmaschine

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015074715A1 (en) * 2013-11-22 2015-05-28 Hewlett-Packard Indigo B.V. Printer with two scanners
EP3456535B1 (de) 2017-09-14 2021-04-21 Heidelberger Druckmaschinen AG Bildinspektion von druckerzeugnissen mit fehlerklassen

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012106981A1 (de) * 2012-07-31 2014-02-06 Eltromat Gmbh Verfahren zur Prüfung des Druckergebnisses bei Rotationsdruckmaschinen
DE102019127996A1 (de) * 2019-10-16 2021-04-22 Windmöller & Hölscher Kg Verfahren zum automatischen Fehlermanagement an einer Druckmaschine
DE102019127994A1 (de) * 2019-10-16 2021-04-22 Windmöller & Hölscher Kg Verfahren zum automatischen Fehlermanagement an einer Druckmaschine
DE102019128139A1 (de) * 2019-10-17 2021-04-22 Windmöller & Hölscher Kg Verfahren zum automatischen Fehlermanagement an einer Druckmaschine

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WO2005115758A1 (de) * 2004-05-25 2005-12-08 Koenig & Bauer Aktiengesellschaft Verfahren und vorrichtung zur einstellung einer übertragung von druckfarbe sowie verfahren zur verwendung dieser vorrichtung

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Publication number Priority date Publication date Assignee Title
WO2005115758A1 (de) * 2004-05-25 2005-12-08 Koenig & Bauer Aktiengesellschaft Verfahren und vorrichtung zur einstellung einer übertragung von druckfarbe sowie verfahren zur verwendung dieser vorrichtung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015074715A1 (en) * 2013-11-22 2015-05-28 Hewlett-Packard Indigo B.V. Printer with two scanners
US10165150B2 (en) 2013-11-22 2018-12-25 Hp Indigo B.V. Printer with two scanners
CN109334252A (zh) * 2013-11-22 2019-02-15 惠普深蓝有限责任公司 打印机、打印的方法以及非瞬态计算机可读介质
CN109334252B (zh) * 2013-11-22 2020-10-20 惠普深蓝有限责任公司 打印机、打印的方法以及非瞬态计算机可读介质
EP3456535B1 (de) 2017-09-14 2021-04-21 Heidelberger Druckmaschinen AG Bildinspektion von druckerzeugnissen mit fehlerklassen

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