EP1990196A2 - Procédé destiné à la régulation de processus d'impression - Google Patents

Procédé destiné à la régulation de processus d'impression Download PDF

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Publication number
EP1990196A2
EP1990196A2 EP08004535A EP08004535A EP1990196A2 EP 1990196 A2 EP1990196 A2 EP 1990196A2 EP 08004535 A EP08004535 A EP 08004535A EP 08004535 A EP08004535 A EP 08004535A EP 1990196 A2 EP1990196 A2 EP 1990196A2
Authority
EP
European Patent Office
Prior art keywords
sensor
measuring
control
value
measured
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Withdrawn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
EP08004535A
Other languages
German (de)
English (en)
Other versions
EP1990196A3 (fr
Inventor
Alfons Schuster
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.)
Manroland AG
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 EP1990196A2 publication Critical patent/EP1990196A2/fr
Publication of EP1990196A3 publication Critical patent/EP1990196A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply

Definitions

  • the invention relates to a method for the regulation of printing processes according to the preamble of claim 1.
  • the DE 42 37 004 C2 discloses a non-marking control method for controlling the color density of a printed product, wherein for this purpose the printed image of the printed product is measured directly by means of sensors. Actual values determined here are compared with reference values which are based on image data or prepress data.
  • the DE 101 49 158 A1 discloses a likewise without a brand-working method for cutting register control on a printing machine, wherein also in this method for the control pressure pre-stage-based setpoints are used.
  • the printing material is moved past a sensor fixed in the running direction or transport direction of the printing material to measure a printed image printed on the substrate, wherein the sensor detects a measuring location within the printed image by measuring to measure the printed image.
  • the printing material is moved past a sensor, wherein the sensor for measuring the print control marks detects a measuring location on the printing material by measurement.
  • the position of the measuring location which usually refers to an angular position of cylinders of the printing press, is known exactly, so that the sensor can measure the exact location of the measurement.
  • the exact position of the measuring location to be measured by the sensor is dependent, among other things, on the path of the printing material through the printing press, so that, in particular, when there are numerous variants of the printing material path through the printing press, as is customary in newspaper printing, the measuring location after Practice is not exactly known in advance, so that the sensor may measure in a wrong place.
  • the present invention has the object to provide a novel method for the regulation of printing processes.
  • This object is achieved by a method according to claim 1.
  • an offset of the measurement location to be measured by the sensor with respect to a control signal of a printing machine is determined automatically such that a pressure pre-stage-based reference value is offset with a measured value of the sensor, and that on the basis of the offset determined in this case, the detection of the or each actual value in the actual regulation.
  • the present invention it is proposed to automatically determine the offset of the measuring location to be measured with respect to a control signal of the printing machine before the actual control, whereby a pressure pre-stage-based reference value is offset with a measured value of the sensor.
  • a pressure pre-stage-based reference value is offset with a measured value of the sensor.
  • the detection of the or each actual value then takes place during the actual regulation of the printing technology process. This ensures that in the control of the sensor always misses the substrate defined in the measuring site to be measured and therefore at the right place. As a result, the achievable control accuracy or reliability can be increased.
  • the reference value is compared with the measured value of the sensor using a correlation method, in particular a standardized cross-correlation, wherein the circumferential position of the measuring location or the offset of the measuring location to the guide signal is determined from the maximum of the correlation.
  • the present invention relates to a method for controlling printing processes, in particular for cutting register control or color register control or for measuring location in the color density control or color location control or any other printing process in which a measuring location on a substrate is measured by means of a sensor for controlling.
  • a measuring location on the printing material is measured by means of a sensor which is preferably stationary in the transport direction of the printing material, for which purpose the printing material is moved past the stationary sensor.
  • a sensor which is preferably stationary in the transport direction of the printing material, for which purpose the printing material is moved past the stationary sensor.
  • the sensor which is preferably stationary in the transport direction of the printing material, metrologically records the printing material at the correct location in the region of the defined measuring location
  • an offset be made in front of the actual control of the printing process to calibrate the control to automatically determine the stationary sensor to be measured locations with respect to a control signal of the printing press.
  • the correct position namely the circumferential position, of the measuring location to be measured with respect to the sensor is determined.
  • a measured value of the sensor is compared with a reference stage based on pressure pre-emphasis, preferably using a correlation method.
  • the offset of the measurement location is determined using a normalized cross-correlation, wherein the offset of the measurement site to be measured is derived from the maximum of the correlation to the control signal of the printing press.
  • the control signal of the printing press is preferably a so-called central encoder signal.
  • cor Normalized cross-correlation is performed using the following equations, where cor is the normalized cross-correlation, where A is the measured value of the sensor, and B is the pressure-bias-based reference value.
  • n corresponds to the number of measuring points in the measured value as well as the reference points in the reference value and therefore the resolution of the latter, the resolution of the measured value corresponding to the resolution of the reference value.
  • the sizes A and B are vectors with n elements.
  • the sizes A and B are matrices with n elements, wherein the n elements of the matrices are structured in columns and rows.
  • the combination of its one-dimensional measuring signal with the movement of the printing material results in a two-dimensional measuring field or a measuring matrix.
  • a one-dimensional correlation vector or a two-dimensional correlation matrix is provided, wherein the element of the correlation vector or the correlation matrix with the maximum value determines the position of the measurement site to be measured, so that the offset of the measurement site to be measured to the central encoder signal can be derived from this element.
  • Fig. 1 illustrates the inventive method for the case for which a one-dimensional sensor is used, wherein in Fig. 1 over the horizontal axis 10, which corresponds to a circumferential position of the printing material, a total of three curves 11, 12, 13 are applied.
  • the curve 11 corresponds to a preset pre-pressure-based reference value for the one-dimensional sensor, wherein the reference value of the Fig. 1 is a one-dimensional reference track or a one-dimensional reference vector.
  • the curve 12 is a measured value recorded with the aid of the sensor in the form of a one-dimensional measuring track or a one-dimensional measuring vector.
  • the result is curve 13, wherein the double arrow 14 corresponds to the calculated offset of the measuring location in the circumferential direction. From curve 13 it follows that the offset is determined by the maximum of the correlation. In addition to the determined offset of the measurement location in the circumferential direction according to the double arrow 14 shows Fig. 1 to illustrate with the double arrow 15, the actual offset of the measurement site 16th
  • the reference value used in the calibration is a pre-pressure-based reference value, which is made up of prepress data, e.g. B. from image data or preview data is determined.
  • the pressure pre-stage-based reference value is preferably determined taking into account data on the characteristic of the sensor, with the actual value of the reference value is calculated.
  • the respective sensor As a characteristic of the respective sensor, preferably its resolution and / or its spectral sensitivity and / or its measuring speed are taken into account.
  • resolution of the sensor a grayscale resolution when using a black and white sensor or its color level resolution when using a color sensor can be considered.
  • a geometric resolution of the sensor can be taken into account when determining the reference value.
  • the characteristic of the printing process such. As a speed of the printing process and / or a geometry of the printing press, are taken into account.
  • the reference value can be generated in a resolution that is less than the resolution of the sensor. This is possible because high accuracy is not required for the calibration.
  • the actual control after calibration is then carried out with a higher resolution, namely the resolution of the sensor.
  • a two-dimensional reference field or a reference matrix with a measured value designed as a two-dimensional measuring field or measuring matrix is used as the reference value for calibrating the control.
  • several relatively small two-dimensional reference fields can be used, which allow a unique orientation by combining their positions on the substrate. These reference fields can be determined in advance and also be identical. The relative position of the reference fields to one another allows an exact calibration.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP08004535.4A 2007-03-16 2008-03-12 Procédé destiné à la régulation de processus d'impression Withdrawn EP1990196A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007012736A DE102007012736A1 (de) 2007-03-16 2007-03-16 Verfahren zur Regelung von drucktechnischen Prozessen

Publications (2)

Publication Number Publication Date
EP1990196A2 true EP1990196A2 (fr) 2008-11-12
EP1990196A3 EP1990196A3 (fr) 2014-04-23

Family

ID=39688221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08004535.4A Withdrawn EP1990196A3 (fr) 2007-03-16 2008-03-12 Procédé destiné à la régulation de processus d'impression

Country Status (2)

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EP (1) EP1990196A3 (fr)
DE (1) DE102007012736A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008023961A1 (de) * 2008-05-16 2009-11-19 Manroland Ag Verfahren zur Regelung von drucktechnischen Prozessen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237004C2 (de) 1992-11-02 1996-07-04 Mohndruck Reinhard Mohn Ohg Verfahren zur Online-Messung der Einfärbung von Druckprodukten
DE10149158A1 (de) 2001-10-04 2003-04-24 Wifag Maschf Verfahren und Vorrichtung zur Ermittlung der Position einer bedruckten Papierbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3915587C1 (en) * 1989-05-16 1990-11-08 Man Roland Druckmaschinen Ag, 6050 Offenbach, De Measurement element for multiple colour offset printing - determines match difference between two partial images independently of quality of image signal
US5412577A (en) * 1992-10-28 1995-05-02 Quad/Tech International Color registration system for a printing press
US5967050A (en) * 1998-10-02 1999-10-19 Quad/Tech, Inc. Markless color control in a printing press
EP1080887A1 (fr) * 1999-08-19 2001-03-07 Quad/Tech, Inc. Système de contrôle de la position d'une bande
EP1512531A1 (fr) * 2003-09-02 2005-03-09 Abb Research Ltd. Système de régulation d'encrage pour machines d'impression
DE102004028056A1 (de) * 2004-04-22 2005-11-17 Maschinenfabrik Wifag Vorrichtung und Verfahren zur Erkennung von Registerfehlern
DE202005021656U1 (de) * 2005-01-05 2009-03-12 Koenig & Bauer Aktiengesellschaft Systeme zur Temperierung von Bauteilen einer Druckmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237004C2 (de) 1992-11-02 1996-07-04 Mohndruck Reinhard Mohn Ohg Verfahren zur Online-Messung der Einfärbung von Druckprodukten
DE10149158A1 (de) 2001-10-04 2003-04-24 Wifag Maschf Verfahren und Vorrichtung zur Ermittlung der Position einer bedruckten Papierbahn

Also Published As

Publication number Publication date
DE102007012736A1 (de) 2008-09-18
EP1990196A3 (fr) 2014-04-23

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