EP2127878A1 - Procédé de détermination de paramètres d'un processus d'impression à l'aide de caméras, d'illuminateurs et d'un motif de test - Google Patents

Procédé de détermination de paramètres d'un processus d'impression à l'aide de caméras, d'illuminateurs et d'un motif de test Download PDF

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Publication number
EP2127878A1
EP2127878A1 EP09160423A EP09160423A EP2127878A1 EP 2127878 A1 EP2127878 A1 EP 2127878A1 EP 09160423 A EP09160423 A EP 09160423A EP 09160423 A EP09160423 A EP 09160423A EP 2127878 A1 EP2127878 A1 EP 2127878A1
Authority
EP
European Patent Office
Prior art keywords
test pattern
printed
printed product
sections
module
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.)
Ceased
Application number
EP09160423A
Other languages
German (de)
English (en)
Inventor
Franz Lampersberger
Andreas Walser
Michael Schönert
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.)
Grapho Metronic Mess und Regeltechnik GmbH and Co KG
Original Assignee
Manroland AG
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 Manroland AG filed Critical Manroland AG
Publication of EP2127878A1 publication Critical patent/EP2127878A1/fr
Ceased legal-status Critical Current

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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
    • 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
    • B41P2233/50—Marks on printed material
    • B41P2233/51—Marks on printed material for colour quality control

Definitions

  • the invention relates to a method for determining parameters of a printing process according to the preamble of claim 1, as well as a device and a printed product, which are each designed to carry out this method.
  • control strips on the sheets or webs to be printed outside the subject with colored test patterns.
  • These control strips whose longitudinal direction is transverse to the transport direction of the printing material, comprise a longitudinally periodically repeating set of measuring fields, on each of which a specific parameter characterizing the print quality can be measured. Even during the movement of the printed product to be examined in the printing press, an image of at least part of the control strip is detected and evaluated.
  • the device comprises at least one camera with a two-dimensional electronic image sensor and a lighting device, which is directed to the observation area of the camera and suitable for its pulse-like illumination during the local residence of the predetermined section of the printed product.
  • the illumination device consists of a multiplicity of individual light sources, the light of which has a different spectral composition due to different emission characteristics and / or filtering, and which are arranged in a regular pattern so that the light sources of each individual group form a regular arrangement whose illumination area is the observation area fully covers the camera on the printed product.
  • a control device By a control device are the individual Groups of light sources such sequentially switched on and off that the observation area of the camera can be illuminated with a sequence of light pulses of different spectral composition. The latter changes periodically and with each light pulse an image of the section of the printed product currently in the observation area of the camera is recorded.
  • a printing process can be monitored in the manner described at the outset by providing a predetermined area of the printed product printed with a suitable control strip as a predetermined section whose image is detected by the device.
  • control strip on the printed product In order to be able to monitor the printing process over the full working width of a printing press, as is necessary, for example, for color density control, the control strip on the printed product must extend over the full working width of the printing press. Since a visibility of the control strip on the printed product in its final state is usually undesirable or unacceptable, in the course of processing the printed product a comprehensive range of the control strip must be cut off and discarded, which reduces the surface yield of the substrate and increases the cost of the printed product.
  • the invention is therefore based on the object to provide a method for determining parameters of a printing process, which is associated with the lowest possible loss of area for the subject, as well as to provide suitable means for carrying out such a method.
  • the inventive method is characterized in that printed a test pattern in the form of a plurality of individual sections on a printed product is offset from each other both in the direction of movement of the printed matter and transversely thereto, and that a separate section image is recorded by means of a plurality of lighting modules and camera modules from each individual section of the test pattern independently of the remaining sections.
  • all sections of the test pattern must together extend at least approximately over the entire width.
  • a particular advantage of the method according to the invention is that the sections of the test pattern can be printed in those areas of the printed product, which are anyway provided in the further processing of the printed product to an end product regardless of the presence of the test pattern to be discarded as a blend, or in to reach a position not visible on the end product. Then there is no additional waste due to the test pattern and the printing material can be optimally utilized for the subject.
  • the measuring apparatus used for carrying out the method uses the position data of the individual test pattern sections from the prepress stage as a data record be transmitted because the required data are there anyway.
  • the camera modules In order for the arrangement of the lighting and camera modules on the printing press to be independent of the arrangement of the individual test pattern sections on the printed product, the camera modules must be able to record the individual section images at different times.
  • the individual section images are processed independently of one another by means of a multiplicity of signal processing modules and respectively parameters of the printing process are determined for that width zone of the printing press in which the respective section has been printed.
  • the evaluation of the individual section images in this case can overlap in time, i. at least partially concurrent, which allows the parameters of interest to be determined more quickly than if the image evaluation across the entire width of the printed product were carried out by a single processing unit, which in this case would represent a bottleneck in the system architecture.
  • the parameters of the printing process determined using the method according to the invention can be transmitted to a control unit of the printing press and used to control the printing process, in particular for controlling the color density.
  • a second aspect of the invention consists in an apparatus for carrying out the method according to the invention.
  • This device has a plurality of mutually identical measuring modules, which are arranged side by side transversely to the direction of movement of the printed product, wherein each measuring module, a camera module for image acquisition, a lighting module for illuminating the Observation area of the camera module and a signal processing module for evaluating the captured by the camera module image contains.
  • each measuring module a camera module for image acquisition, a lighting module for illuminating the Observation area of the camera module and a signal processing module for evaluating the captured by the camera module image contains.
  • each measuring module also contains its own power supply module.
  • only a single supply voltage with a standard value for the entire device needs to be provided by the central power supply of the printing press.
  • the different supply voltages for the sub-modules contained in each measuring module are then generated internally.
  • Each measuring module according to the invention has different external interfaces. These include in particular a data interface, via which it can be connected to a central control unit, as well as a trigger input, via which the recording and evaluation of an image can be triggered by the measuring module. From the outside, internal functions of each individual measuring module can be individually configured by a central control unit via the data interface. For example, the time interval between triggering and image acquisition, the illumination intensity, and the range of pixels of the image sensor contained in the camera module, but also the Type of processing of the image signal in the form of running in the signal processing module program belong.
  • a third aspect of the invention consists in a printed product with a test pattern which is designed for the application of the method according to the invention and therefore has the features assumed in this method for the test pattern.
  • each of the individual sections of the test pattern is in the form of a strip that is transverse to the direction of movement extends the printed product and includes a plurality of fields in which full and / or raster tones of the individual inks are printed.
  • Fig. 1 shows an example of a section of a test pattern 1 for the color density control of a printing press. It has the shape of a stripe with a linear periodic sequence of contiguous fields 2, of which in Fig. 1 only a few are marked with the reference number 2. Fields 2 each print a solid or halftone tone of an ink.
  • the longitudinal direction of the strip-shaped test pattern 1 extends in Fig. 1 in the x-direction, ie transversely to the direction of movement y of the printed product in the printing press.
  • the different colors or tones are in Fig. 1 symbolized by different hatching or dot patterns. For example, four-color printing can be full tones of black, yellow, magenta, and cyan inks.
  • individual fields 2 may also be unprinted in the test pattern 1 in order to serve as a white reference.
  • Three sections 1A, 1B and 1C are marked on the test pattern 1, which will be of interest in the future.
  • a strip-shaped test pattern 1 of in Fig. 1 shown type can be found using a device whose structure and operation in the DE 10 1904 003 613 A1 described in detail, the color density over the entire working width of a printing machine during operation are measured, including the test pattern 1 must extend in the x-direction over the entire working width.
  • a printed product 3 according to the invention in the form of a rectangular arc which is suitable for carrying out the method according to the invention with a device according to the invention designed for this purpose, is shown Fig. 2 .
  • the printed product 3 has a test pattern 1, which no longer consists of a single contiguous strip, but of three separate strip-shaped sections 1A, 1B and 1C, which in the y-direction, the direction of movement of the printed product in the printing press, offset from each other. Together, the three sections 1A, 1B and 1C cover approximately the entire width of the printed product 3 used for the subject.
  • the printed product 3 contains in this case four separate benefits 4 to 7, which are punched out during the processing of the printed product 3 and further processed separately.
  • the four benefits 4 to 7 have different shapes, which are very different from rectangles and have various protrusions, by which they are interleaved within the printed product.
  • the benefits 4 to 7 may be components of packages of various products that have been grouped and arranged on the rectangular sheet of the printed product 3 so that the total area of a sheet is widely used and only little waste is produced.
  • the middle test pattern section 1B is located in a region of the printed product 3 that does not belong to any of the benefits 4 to 7, that is to say that it is discarded anyway as a waste, regardless of the presence of the test pattern section 1B.
  • the other two test pattern sections 1A and 1C are located in edge regions of the benefits 5 and 7, respectively, which, when further processed, reach a position in which they are not visible on the end product.
  • these may be areas of the benefits 5 and 7, which are later turned inside, or it may be adhesive tabs on which the respective benefits 5 or 7 with themselves or other components of a package to which he belongs, is glued.
  • the test pattern sections 1A and 1C are in areas where they do not interfere with the final product so that they do not need to be cut off.
  • test pattern 1 into individual sections 1A, 1B and 1C, which can be distributed over anyway unused and / or non-visible areas, against a contiguous, across the entire printed product 3 extending strip, such as him Fig. 1 shows, waste can be saved.
  • Fig. 2 the number of three test pattern sections 1A, 1B and 1C shown is meant to be purely exemplary. It can also be only two or more than three sections.
  • a measuring device 8 which consists of a series of identical measuring modules 8A to 8H.
  • the measuring modules 8A to 8H are arranged linearly next to one another transversely to the direction of movement of the printed product 3, that is to say in the x direction, and can each measure a part of a test pattern section 1A, 1B or 1C corresponding to their width.
  • Fig. 2 These measuring modules are shown in dashed lines. The number of measuring modules required depends on the width of the printed product 3 and on the width of a single measuring module 8A to 8H. In the Fig. 2 The number of eight measuring modules 8A to 8H shown is meant purely by way of example.
  • the two middle measurement modules 8D and 8E together completely cover the middle test pattern portion 1B in width, and thus can collectively perform the color density measurement on that portion 1B.
  • the sections 1A and 1C are approximately covered by the measuring modules 8A to 8C and 8F to 8H, respectively, but the rightmost field 2A of the section 1A and the leftmost field 2B of the section 1C are not completely covered.
  • either the measurement of the relevant field 2A or 2B must be dispensed with, or the middle modules 8D and 8E must also be used for measurements on the outer sections 1A and 1C, respectively, for measurement at the middle section 1B, which increases their utilization accordingly.
  • each of the measuring modules 8A to 8H only for the measurement on a single test pattern section 1A, 1B or 1C and possibly accept that some fringe fields of test pattern sections 1A and 1C can not then be measured.
  • the width of a test pattern section 1A, 1B and 1C corresponds to the width of a measuring module 8A to 8H or an integral multiple thereof, and if the test pattern sections in the x direction respectively match those measuring modules, of which they are to be measured.
  • each printed product 3 first the section 1A appears in the observation area of the measuring modules 8A to 8C. From these measuring modules 8A to 8C, an image of the section 1A is taken and to determine the desired color density values of evaluated in the field 1A contained fields. Specifically, each measuring module 8A to 8C autonomously picks up a partial image of a part of the section 1A corresponding to the module width and evaluates it independently. As a result of the measurement, each module 8A to 8C provides a set of color density values of the fields included in the respective sub-image of the section 1A, which can be read out by an external unit and, in particular, transmitted to a color density control unit.
  • the middle test pattern portion 1B comes into the observation area of the measurement modules 8D and 8E, the above-described operation with respect to the portion 1B and the measurement modules 8D and 8E is repeated in an analogous manner.
  • the taking of an image of the section 1B in the form of two partial images and their processing by the measuring modules 8D and 8E can in this case be carried out regardless of whether the evaluation of the three partial images of the section 1A by the measuring modules 8A to 8C already completed or still is in progress.
  • each time a test pattern portion 1A, 1B or 1C appears in the observation area of each associated group of the measurement modules 8A to 8H usually only one image may be taken in a single illumination type.
  • several different copies of the respective test pattern section 1A, 1B or 1C successive past the measurement modules 8A to 8H must be used.
  • FIG. 1 A block diagram of a modular measuring device according to the invention is shown in FIG. Their essential components are a multiplicity of measuring modules 8A to 8H, a common power supply 9 for the measuring modules 8A to 8H, a central measuring computer 10 and a common trigger unit 11.
  • All measuring modules 8A to 8H are connected via a bus line 12 to the central measuring computer 10, via which control signals are transmitted from the measuring computer 10 to the measuring modules 8A to 8H and data in both directions.
  • the data transmitted by the measuring modules 8A to 8H to the measuring computer 10 include not only the measured data obtained, but also status and diagnostic data. From the central measuring computer 10 to the measuring modules, for example, data for the configuration or parameterization of internal functions of the measuring modules 8A to 8H are transmitted before the beginning of the printing operation.
  • a common trigger signal is supplied via a trigger line 13 to all measuring modules 8A to 8H and to the central measuring computer 10.
  • the trigger unit 11 generates the trigger signal either by optically scanning a trigger mark located on the printed product 3 in the direction of movement before the first test pattern section 1A, which is necessary in particular for a printed product 3 in the form of an endless printing material web or, in the case of sheetfed printing, either by scanning the leading edge of the printed product 3, or by calculation from the signal of a rotary encoder, which indicates the arc movement.
  • the delay time which a measurement module 8A to 8H has to wait between the receipt of the trigger signal on the line 13 until it can pick up and evaluate a sub-image of a test pattern section 1A, 1B or 1C depends on which section 1A, 1B or 1C it allocates is.
  • This delay time belongs to the data which are transmitted to the individual measuring modules 8A to 8H before the start of the printing operation by the measuring computer 10.
  • the common power supply 9 provides on the line 14, a single supply voltage, for. B. 24 volts, to all measuring modules 8A to 8H.
  • the provision of different voltages for the various subunits of each measuring module 8A to 8H is done internally in the individual measuring modules 8A to 8H.
  • the central measuring computer 10 still receives a clock signal from a clock 15 of the printing machine, which indicates the operating speed of the printing press. From this clock signal, the measuring computer 10 can determine the rate at which it has to deliver measured data records via the local data network 16 of the printing machine to the color density control unit of the printing press so that it can fulfill its function.
  • FIG. 4 A block diagram of the internal structure of the measuring module 8A, which is identical to those of the other measuring modules 8B to 8H, Fig. 4. It consists of four main sub-modules, namely a camera module 17, a lighting module 18, a signal processing module 19 and a power supply module 20th
  • the marking of the external connections 12 to 14 of the measuring module 8A corresponds to that of FIG. 3.
  • the camera module 17 contains a CCD sensor 21 for image acquisition and an associated control unit 22. It is designed only for taking black and white images, ie it provides only brightness values and no color information for a given illumination. Of course belong to the Camera module 17 in total also various optical system components, which do not occur in an electronic block diagram.
  • the illumination module 18 contains an LED array 23, that is to say a regular arrangement of a plurality of groups of differently colored light-emitting diodes, for example respective groups of the emission colors red, green and blue, and likewise an associated control unit 24.
  • the latter alternately applies current pulses to the LEDs of the different color groups, for which purpose It is caused by appropriate control signals at one of its inputs, and thus ensures the delivery of light flashes of periodically alternating colors through the LED array 23rd
  • the signal processing module 19 includes an analog-to-digital converter 25 for digitizing the image signals supplied from the CCD sensor 21 of the camera module 17, an image memory 26 for storing the images digitized by the A / D converter 25, a lighting controller 27 for controlling the lighting module 18, a camera controller 28 for controlling the camera module 17, a signal processor 29 for evaluating the images stored in the image memory 26 and a data interface 30 for communication with the central measuring computer 10 (FIG. 3) to which the evaluation results of the signal processor 29 are transmitted.
  • an analog-to-digital converter 25 for digitizing the image signals supplied from the CCD sensor 21 of the camera module 17, an image memory 26 for storing the images digitized by the A / D converter 25, a lighting controller 27 for controlling the lighting module 18, a camera controller 28 for controlling the camera module 17, a signal processor 29 for evaluating the images stored in the image memory 26 and a data interface 30 for communication with the central measuring computer 10 (FIG. 3) to which the evaluation results of the signal processor 29 are transmitted.
  • the power supply module 20 includes a plurality of DC / DC converters 31A-31X for supplying electrical power to all other submodules 17, 18, and 19, providing a variety of different supply voltages to the various components included in the submodules 17, 18, and 19. Accordingly, power supply lines 32A, 32B, and 32C extend from the power supply module 20 to the other submodules 17, 18, and 19, and each of these lines may also include multiple wires of mutually different voltages.
  • the signal processing module 19 is connected to the illumination module 18 via an internal trigger line 33 for triggering illumination pulses and via a Data line 34 for the transmission of operating parameters such as lighting intensity and duration, order of different lighting colors, etc. connected. Connections between the signal processing module 19 and the camera module 17 are in the form of another internal trigger line 35 for triggering image captures by the camera module 17, a data line 36 for transmitting image signals to the signal processing module 19 and a control line 37 for transmitting control signals.
  • Essential to the invention is at the system structure of the measuring module 8A shown in Fig. 4, the integration of at least the signal processing module 19 and in continuation of the inventive idea and the power supply module 20 in the measuring module 8A.
  • the processing or power supply functions are now decentralized and the entire system is modularized in such a way that its working width is modularized compared with the aforementioned prior art in which only camera modules 17 and lighting modules 18 were combined to form common units can be varied with very little effort.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP09160423A 2008-05-27 2009-05-15 Procédé de détermination de paramètres d'un processus d'impression à l'aide de caméras, d'illuminateurs et d'un motif de test Ceased EP2127878A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810025417 DE102008025417A1 (de) 2008-05-27 2008-05-27 Verfahren zur Ermittlung von Parametern eines Druckprozesses

Publications (1)

Publication Number Publication Date
EP2127878A1 true EP2127878A1 (fr) 2009-12-02

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016198418A1 (fr) * 2015-06-08 2016-12-15 Koenig & Bauer Ag Dispositif de mesure et/ou de vérification d'un élément typographique disposé sur un substrat
EP3208089A1 (fr) * 2016-02-18 2017-08-23 Goss International Americas, Inc. Barre de couleur intégrée et procédé
CN110154535A (zh) * 2018-02-16 2019-08-23 海德堡印刷机械股份公司 用于将印刷测控条印刷在承印材料页张上的方法
US11787169B2 (en) * 2019-04-12 2023-10-17 Elexis Ag Apparatus for inspecting printed images and method for validating inspection algorithms

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DE202010008409U1 (de) * 2010-08-31 2011-12-07 Eltromat Gmbh Vorrichtung zur Farbmessung in einer Rotationsdruckmaschine

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DE19632969A1 (de) * 1996-08-16 1998-02-19 Roland Man Druckmasch Verfahren zur Ermittlung von Vorgabewerten für die Steuerung einer Druckmaschine
US20040090475A1 (en) 2002-03-28 2004-05-13 Olympus Optical Co., Ltd. Image recording apparatus
EP1445099A1 (fr) 2003-02-10 2004-08-11 Kba-Giori S.A. Capteur
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Publication number Priority date Publication date Assignee Title
WO2016198418A1 (fr) * 2015-06-08 2016-12-15 Koenig & Bauer Ag Dispositif de mesure et/ou de vérification d'un élément typographique disposé sur un substrat
EP3208089A1 (fr) * 2016-02-18 2017-08-23 Goss International Americas, Inc. Barre de couleur intégrée et procédé
CN110154535A (zh) * 2018-02-16 2019-08-23 海德堡印刷机械股份公司 用于将印刷测控条印刷在承印材料页张上的方法
CN110154535B (zh) * 2018-02-16 2020-10-30 海德堡印刷机械股份公司 用于将印刷测控条印刷在承印材料页张上的方法
US11787169B2 (en) * 2019-04-12 2023-10-17 Elexis Ag Apparatus for inspecting printed images and method for validating inspection algorithms

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