WO2010003791A1 - Machine d’impression - Google Patents

Machine d’impression Download PDF

Info

Publication number
WO2010003791A1
WO2010003791A1 PCT/EP2009/057528 EP2009057528W WO2010003791A1 WO 2010003791 A1 WO2010003791 A1 WO 2010003791A1 EP 2009057528 W EP2009057528 W EP 2009057528W WO 2010003791 A1 WO2010003791 A1 WO 2010003791A1
Authority
WO
WIPO (PCT)
Prior art keywords
reference color
printing machine
color pattern
printing
machine according
Prior art date
Application number
PCT/EP2009/057528
Other languages
German (de)
English (en)
Inventor
Thomas Boosmann
Andreas Lippold
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
Priority to EP09779814A priority Critical patent/EP2307200A1/fr
Priority to JP2011517064A priority patent/JP2011527419A/ja
Publication of WO2010003791A1 publication Critical patent/WO2010003791A1/fr

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
    • 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
    • H04N1/6044—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis involving a sensor integrated in the machine or otherwise specifically adapted to read the test pattern

Definitions

  • the invention relates to a printing press according to the preamble of claim 1.
  • the illumination behavior of the illumination source as well as the measurement characteristic of the camera used may change.
  • this then leads to different measured values for the measuring pixels of the camera, which then in the case of methods known from practice, concludes that there is a changing coloring, although the coloring as such actually remains unchanged. If such measured values are then used for color control, this has a negative effect on the print quality. This is a disadvantage.
  • a rotating assembly of the printing press is assigned at least one reference color pattern, which is not covered by the printing material, wherein the camera metrologically detects the illuminated substrate and the or each illuminated reference color pattern, wherein a Kalibriereinrich- device recorded with the camera color value of the respective reference color pattern with a compares the reference color value stored for the respective reference color pattern and, on the basis of this comparison, determines correction values for at least those for measuring pixels of the camera which metrologically detect the respective reference color pattern in order to correct measured values of the measuring pixels with the aid of the correction values.
  • At least one constant, permanent reference color pattern which is assigned to a rotating assembly group of the printing press which is not covered by the printing material, can compensate for a changing illumination behavior of a lighting source as well as a changing measuring characteristic of the camera used.
  • a change in the color properties of the substrate can be differentiated from changes in the illumination source and the camera. As a result, the measurement accuracy can be increased.
  • the invention relates to a printing machine, in particular a sheet-fed printing machine, wherein a sheet-fed printing machine comprises a plurality of printing units for printing on printed sheets.
  • a printing unit comprises an impression cylinder, a rolling on the impression cylinder transfer cylinder, a rolling on the transfer cylinder form cylinder, an inking unit and optionally a dampening unit.
  • a printing form is positioned on the printing unit with the aid of the inking unit and dampening solution is applied by means of the dampening unit.
  • the ink applied to the printing form is transferred to a printing material by means of a transfer mold positioned on the transfer cylinder, which is transported through a printing gap between the transfer cylinder and the impression cylinder.
  • printing machines which comprise a device for measuring the color of a printed substrate within the printing press.
  • a device for measuring the color of a printed substrate within the printing press or inline for printing comprises an illumination source to illuminate the printed substrate within the printing machine and a camera having a plurality of measuring pixels to print the illuminated substrate within the printing machine Detect area of the same metrologically.
  • the area of the printing material illuminated by the illumination source and the area of the printing material captured by the camera preferably extend over the entire format width of the printing material.
  • the camera used for measuring the printing material is calibrated to the type of printing material and to the illumination source, wherein in particular changes in the illumination behavior of the illumination source as well as the measuring characteristic of the camera used can lead to a falsification of color values of the printed printing material detected with the aid of the camera. There is therefore a need for a printing machine with which the change in a lighting behavior of the illumination source and a change in the measuring characteristic of the camera used can be compensated or compensated.
  • a rotating assembly of the printing machine is assigned at least one reference color pattern, namely such that the reference color pattern is not covered by the printing material, illuminated by the illumination source and can be detected by the camera by measurement.
  • the camera records the illuminated substrate as well as the or each reference color pattern, wherein a calibration device compares a color value of the respective reference color pattern recorded with the camera with a reference color value stored for the respective reference color pattern and based on this comparison at least for the measuring pixels of the camera measuring the respective reference color pattern - acquire technical data, determine correction values in order to correct measured values of the measuring pixels with the aid of the correction values.
  • the or each reference color pattern is a permanent and thus constant color pattern, with the help of which the referencing to a constant reference value and thus an absolute calibration is possible.
  • a counter-pressure cylinder of a printing unit of the printing press is assigned the or each reference color pattern.
  • a reference color pattern with at least one gripper of the impression cylinder, which serves to grasp a printed substrate in the region of a so-called leading edge thereof.
  • reference color patterns in the region of the leading edge between adjacent grippers can be positioned, for example, on connections between them, which are then preferably in the plane of the printing material, whereas reference color patterns applied to the grippers are positioned above the plane of the printing material.
  • at least one reference color pattern can also be assigned to a channel of the impression cylinder, with the or each reference color pattern assigned to the channel of the impression cylinder then extending along a trailing edge of the respective printing material or printing sheet.
  • the or each reference color pattern may be detachably or permanently connected to the rotating assembly of the printing press, preferably to the impression cylinder.
  • At least one reference color pattern for white is present.
  • a white reference color pattern all channels of a camera can be referenced or calibrated.
  • additional reference color patterns for cyan and / or magenta and / or yellow and / or black are additionally present in order to individually reference or calibrate individual channels of the camera.
  • reference color patterns for red and / or green and / or blue are present so as to directly calibrate individual channels of the camera. The colors mentioned here for reference color patterns are preferred, but not mandatory.
  • each reference color pattern extends along a leading edge and / or along a trailing edge of the printed substrate, namely printed signature, and thus along the format width of the signature, without the or each reference color pattern is covered by the substrate and thus printing sheet ,
  • a corresponding correction value can be determined for each measuring pixel of a line scan camera. Then, if the or each reference color pattern extends only in sections over the axial format width of the printed sheets, a corresponding correction value can be determined directly with the invention for the measuring pixels which metrologically detect the respective reference color pattern. For those measuring pixels which do not detect a reference color pattern by measurement, corresponding correction values can be determined, for example, by interpolation or by measuring an unprinted area of a printing material.
  • the printing press according to the invention comprises a cleaning device in order to clean the or each reference color pattern at defined time intervals and / or depending on the degree of soiling.
  • the cleaning device can be z. B. working with compressed air or remove dirt from the or each reference color pattern by mechanical or chemical means.
  • a cleaning device to continuously clean the or each reference color pattern with each rotation of the rotating assembly to which the respective reference color pattern is assigned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

L’invention concerne une machine d’impression, en particulier une machine d’impression de feuilles, avec un dispositif pour mesurer la coloration d’un support d’impression imprimé à l’intérieur d’une machine d’impression. Le dispositif comprend une source d’éclairage pour éclairer le support d’impression imprimé à l’intérieur de la machine d’impression et le dispositif comprend une caméra présentant plusieurs pixels de mesure pour détecter par une technique de mesure le support d’impression éclairé à l’intérieur de la machine d’impression dans une zone imprimée de celui-ci. Selon l’invention, au moins un échantillon de couleurs de référence qui n’est pas recouvert par le support d’impression est associé à un sous-ensemble rotatif de la machine d’impression. La caméra détecte le support d’impression éclairé et l’échantillon ou chaque échantillon de couleurs de référence éclairé. Un dispositif d’étalonnage compare une valeur de couleur de l’échantillon de couleurs de référence en cause qui a été détectée par la caméra avec une valeur de couleur de référence stockée pour l’échantillon de couleurs de référence en cause et détermine, sur la base de cette comparaison pour les pixels de mesure de la caméra qui détectent par la technique de mesure l’échantillon de couleurs de référence en cause, des valeurs de correction pour corriger les valeurs de mesure des pixels de mesure à l’aide des valeurs de correction.
PCT/EP2009/057528 2008-07-11 2009-06-17 Machine d’impression WO2010003791A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09779814A EP2307200A1 (fr) 2008-07-11 2009-06-17 Machine d'impression
JP2011517064A JP2011527419A (ja) 2008-07-11 2009-06-17 印刷機

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008040364A DE102008040364A1 (de) 2008-07-11 2008-07-11 Druckmaschine
DE102008040364.4 2008-07-11

Publications (1)

Publication Number Publication Date
WO2010003791A1 true WO2010003791A1 (fr) 2010-01-14

Family

ID=40957650

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/057528 WO2010003791A1 (fr) 2008-07-11 2009-06-17 Machine d’impression

Country Status (4)

Country Link
EP (1) EP2307200A1 (fr)
JP (1) JP2011527419A (fr)
DE (1) DE102008040364A1 (fr)
WO (1) WO2010003791A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016224307A1 (de) 2015-12-15 2017-06-22 Heidelberger Druckmaschinen Ag Verfahren zur Überprüfung eines Bildinspektionssystems

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20213431U1 (de) * 2002-08-31 2002-11-07 Roland Man Druckmasch Einrichtung zur Qualitätskontrolle an Drucksachen
WO2005108084A1 (fr) 2004-05-03 2005-11-17 Heidelberger Druckmaschinen Ag Mesure et regulation en ligne dans des machines d'impression

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20213431U1 (de) * 2002-08-31 2002-11-07 Roland Man Druckmasch Einrichtung zur Qualitätskontrolle an Drucksachen
WO2005108084A1 (fr) 2004-05-03 2005-11-17 Heidelberger Druckmaschinen Ag Mesure et regulation en ligne dans des machines d'impression

Also Published As

Publication number Publication date
EP2307200A1 (fr) 2011-04-13
JP2011527419A (ja) 2011-10-27
DE102008040364A1 (de) 2010-01-14

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