EP0337148A2 - Procédé de commande de l'encrage d'une machine d'impression - Google Patents

Procédé de commande de l'encrage d'une machine d'impression Download PDF

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Publication number
EP0337148A2
EP0337148A2 EP89104677A EP89104677A EP0337148A2 EP 0337148 A2 EP0337148 A2 EP 0337148A2 EP 89104677 A EP89104677 A EP 89104677A EP 89104677 A EP89104677 A EP 89104677A EP 0337148 A2 EP0337148 A2 EP 0337148A2
Authority
EP
European Patent Office
Prior art keywords
color location
tolerance
density
target color
densities
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.)
Granted
Application number
EP89104677A
Other languages
German (de)
English (en)
Other versions
EP0337148B1 (fr
EP0337148A3 (en
Inventor
Nikolaus Pfeiffer
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen 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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0337148A2 publication Critical patent/EP0337148A2/fr
Publication of EP0337148A3 publication Critical patent/EP0337148A3/de
Application granted granted Critical
Publication of EP0337148B1 publication Critical patent/EP0337148B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/45—Sensor for ink or dampening fluid thickness or density
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/47—Automatic or remote control of metering blade position

Definitions

  • the invention relates to methods for color control of a printing press, wherein measuring fields are optically scanned on the printed sheets printed by the printing press, the actual color location obtained for each measuring field with the aid of the scanning being compared with a predetermined target color location, and furthermore ink guiding members of the printing machine can be controlled in the sense of a reduction in color deviations.
  • the color guide elements are set in accordance with the measurement results without the limit values for the layer thicknesses or densities being observed in detail.
  • limit values it is also known to end the readjustment when limit values are reached, so that inadequate color rendering is accepted in favor of the maximum permissible layer thicknesses not being exceeded.
  • the layer thicknesses are ultimately controlled in the printing press.
  • inputs and outputs are usually made in density values, which are related to the values for the layer thicknesses through the Tollemaar function. Since in the method according to the invention Calculation, output and / or input based on density values or layer thicknesses, the term layer thickness / density is used in the following.
  • the object of the invention is to increase the print quality in an economical manner, in particular to allow the most accurate possible approximation to a target color location given predetermined maximum permissible layer thicknesses / densities.
  • a method according to the invention is characterized in that, using the actual color location and the target color location, the layer thicknesses / densities of printing inks required to achieve the target color location are calculated such that when the target color location or a color location is reached within a predetermined tolerance -Area around the target color location, the calculated layer thicknesses / densities are used to adjust the ink guide elements of the printing press, that a failure to reach the target color location or the tolerance range around the target color location is indicated, and that an adjustment of the ink guide elements and a subsequent print and / or a further calculation of layer thicknesses / densities takes place only after manual entry.
  • this method enables manual intervention if a weighing up between different quality parameters is required.
  • the method is primarily intended for multi-color printing, it can also be used for single-color printing.
  • the process according to the invention can also be carried out in a closed control loop by continuous scanning of printed sheets and correspondingly frequent readjustment of the ink guide members.
  • a further development of the method provides that values for expanding the tolerance range and / or for increasing one or more layer thicknesses / densities are output if the target color location or the tolerance range is not reached by the target color location.
  • This output can also take the form of a proposal, to which the printer only has to enter one of several predefined answers. After the output, for example, an input can be queried as to whether the proposed extension of the tolerance range or whether the proposed increase of at least one of the layer thicknesses / densities should be carried out.
  • a further method according to the invention enables the color locus which is possible taking into account the maximum permissible layer thicknesses / densities to be largely approximated to the target color locus in that, in the event that the target color locus cannot be achieved within maximum permissible layer thicknesses / densities, on one a first color location (E1), for which one of the printing inks has its maximum permissible layer thickness / density, that an attempt is made by changing the layer thicknesses / densities of further printing inks, one within the smallest possible
  • the layer thickness (s) / density (s) of the remaining printing ink (s) is (are) changed to the smallest possible with the tolerances weighted distance to the target color location is reached, and that the color location thus calculated corresponds appropriate data are given to the ink guide elements of the printing press when the color location reached is within a predetermined tolerance.
  • a further development of this method provides that the tolerance is specified as a tolerance space, that after the calculation of the first color location, a level comprising the first color location and all color locations which can be achieved by changing the layer thickness / density of the further printing inks is calculated, that it is checked which point of the level requires a minimum tolerance space and this point is defined as the new target color location, that in the event that at the new target color location the layer thickness / density of at least one of the further printing inks is greater than the maximum permissible layer thickness / density, a second color location (E2) is calculated on a straight line connecting the first color locus (E1) and the new target color locus, at which one of the further printing inks reaches the maximum permissible layer thickness / density that a straight line is calculated on which those color locations lie which can be achieved by changing the layer thickness / density of a third printing ink, and that the point of the intersection line is determined as the new target color location at which the necessary tolerance space is minimal.
  • the printer can allow an increase in the layer thicknesses / densities or an extension of the tolerances.
  • the tolerance range or the tolerance space within the color space can have the shape of an ellipsoid, the longest axis of which lies in the direction of the brightness axis.
  • other shapes are also conceivable and possible, such as that of a cuboid, the tolerances in the direction of the brightness axis L and the direction of the two color axes a, b are independent of one another.
  • a tolerance space in which the tolerances in the direction of the two color axes depend on one another, but the tolerance in the direction of the brightness axis is independent of these, can be specified by a cylinder whose axis runs parallel to the brightness axis.
  • a printing press 1 is provided in a manner known per se with ink guide elements 2, with the aid of which the ink supply and thus the layer thickness / density can be controlled by control signals.
  • control signals are supplied to the color guide elements 2 by a color control unit 3, which generates the control signals on the basis of color control data, which are stored in one
  • An input / output device 4 can be generated in connection with a measured value processing unit 5.
  • An actual value feedback to the input / output unit 4 is provided by the ink guide elements 2.
  • a print control strip 7 with a plurality of color measurement fields is located on a print sheet 6 printed by the printing press. These are scanned by a measuring head 8, which is part of a color measuring device with a spectrometer 9.
  • An electronic measuring head control unit 10 controls the position of the measuring head 8, whereby the actual position of the measuring head 8 can be forwarded to the measuring head control unit 10 and further to the measured value processing unit 5. Measured values are passed from spectrometer 9 to measured value processing unit 5.
  • the printer is made 4 suggestions via the input / output device, which he can follow or change by making appropriate entries.
  • the measured values of the spectrometer ie the actual values
  • the target values, the tolerances and the respective layer thickness / density Smax are taken from a memory.
  • the differences between the measured values and the target values are formed by a subtraction 23, from which the layer thickness / density changes deltaSs at 24 are calculated.
  • the existing layer thicknesses / densities Sist are calculated from the actual values. Adding Sist and deltaSs at 26 results in the setpoints for the layer thicknesses / densities Sneu. At 20, these are compared with the maximum values for the layer thicknesses / densities.
  • the program is branched at 27. If the target layer thicknesses / densities Sneu are not greater than the maximum permissible layer thicknesses / densities Smax, the data corresponding to the target layer thicknesses / densities Sneu are supplied to the color control unit 3 (FIG. 1) and the ink guide elements 2 of the printing press 1 are controlled accordingly.
  • the target layer thicknesses / densities Sneu are greater than the maximum permissible layer thicknesses / densities Smax
  • an optimal point in the color space is calculated at 28, at which the layer thicknesses / densities are smaller than the permissible layer thicknesses / densities Smax.
  • a decision is then made as to whether this color locus lies within the tolerances. If this is the case, the output of the color control data and its transmission to the color control unit 3 (FIG. 1) is again initiated in the program part 30.
  • the printer input is queried. If this entry includes an expansion of the tolerances, the calculated color control data are output and transmitted after branching 34. If the printer has no new tolerances, but has entered larger values for the permissible layer thicknesses / densities, a new color location is calculated after branching 35 at 28. If this is within the tolerances, the color control data is output. If this is not the case, alternative suggestions are again calculated so that the printer has the opportunity to enter new tolerances or new permissible layer thicknesses / densities. The printer declares If there are no new tolerances or new permissible layer thicknesses / densities, then after passing through branches 34 and 35, the printer is asked at 36 whether printing should take place outside the permissible tolerances. If the printer affirms this by a corresponding input, corresponding color control data are output to the color control unit 3 after branching 37. However, if the printer does not allow printing outside the tolerances, this leads to an abort at 38.
  • tolerance and tolerance range are explained with the aid of FIG. 3 using the example of a tolerance ellipsoid.
  • L the origin of the coordinate system L
  • a, b representing the color space according to FIG. 3
  • the target value for the color to be printed is assumed.
  • All actual values that lie within an ellipsoid with the semi-axes deltaL, deltaA and deltaB are tolerated. Since people tend to accept deviations in brightness as color casts, deltaL is larger than deltaA or deltaB.
  • the tolerance values on which the respective print job is based depend on the print quality required in each case and can be entered by the printer.
  • a "calculation tolerance” which is smaller than the tolerance specified by the printer is preferably used for the calculations within the method according to the invention .
  • a first method step is explained with reference to FIG. 4.
  • the color locus Eist measured with the spectrometer 9 and the target color locus Esoll are connected by a straight line, the equation of which is also shown in FIG. 4.
  • deltaL, deltaa and deltab mean the differences between the coordinates of the target color location and the actual color location
  • deltaS1s, deltaS2s and deltaS3s the differences in the layer thicknesses / densities of the printing inks and A a constant.
  • Lambda is the independent variable that identifies the location on the straight line.
  • the layer thicknesses / densities for the color location Esoll lie within the maximum permissible layer thicknesses / densities. If this is not the case, however, the printing ink is determined which, with the same change in all three printing colors, is the first to reach the maximum permissible layer thickness / density in proportion to the required change in deltaSs. This printing ink is referred to below as F1.
  • the color location E1 is calculated on the connecting line between Eist and Esoll at which the printing ink F1 has reached the maximum permissible layer thickness / density.
  • the following step is explained with reference to FIG. 5.
  • a level of those color locations is calculated which can be achieved by changing the two remaining printing colors. This level is hatched in FIG. 5 and in other figures.
  • the plane is cut with the tolerance ellipsoid. This determines the amount of color locations that match the both printing inks F2 and F3 can be achieved and are within the tolerance range. If the plane intersects the tolerance ellipsoids, a real ellipse is created. If the plane avoids the ellipsoids, the ellipse is imaginary.
  • the next step in the process is to determine the point for which the necessary tolerance space becomes minimal, here the center of the ellipse. This becomes the new setpoint Es'.
  • Es' is the point on the plane that would be the center point of the sectional ellipse in the case of an enlarged ellipsoid. It is always real, even with an imaginary ellipse.
  • new setpoints for the layer thicknesses / densities are calculated and output, provided there is a real ellipse and the layer thicknesses / densities for Es' are not greater than Smax. If the latter is not the case, then starting from the color location E1, the printing ink is determined which, with the same change in the two printing inks F2 and F3 in proportion to their required change deltaSs, is the first to reach the maximum permissible layer thickness / density.
  • the point E2 lies on the connecting line between E1 and Es' (Fig. 8).
  • a plane of the color locations that could be achieved by changing the printing inks F2 and F3 was calculated, in a further method step a straight line is calculated, which is described by a further change in the printing color F3.
  • This straight line is designated in Fig. 9 with S3 '.
  • S3 ' By cutting the straight line S3 'with the tolerance ellipse, the amount of those color locations is determined which can be achieved with the third printing ink and which are within the tolerance range. If the straight line avoids the ellipse, see above if the intersections are imaginary, if there is an intersection, they are real.
  • the point on the straight line is calculated, at which the necessary tolerance space becomes minimal - the center point of the chord formed by the straight line - and is adopted as the new setpoint Es ⁇ .
  • Es ⁇ is the point that would result from a magnification of the ellipsoid as the center. It is always real, even at imaginary intersections.
  • the formation of Es ⁇ is in Fig. 10 for the case that the straight line S3 'does not intersect the tolerance ellipsoids.
  • the color location Es ′′′ is determined for which the layer thickness / density corresponds to the maximum permissible layer thickness / density Smax.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
EP89104677A 1988-04-12 1989-03-16 Procédé de commande de l'encrage d'une machine d'impression Expired - Lifetime EP0337148B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3812099 1988-04-12
DE3812099A DE3812099C2 (de) 1988-04-12 1988-04-12 Verfahren zur Farbsteuerung einer Offsetdruckmaschine

Publications (3)

Publication Number Publication Date
EP0337148A2 true EP0337148A2 (fr) 1989-10-18
EP0337148A3 EP0337148A3 (en) 1990-08-22
EP0337148B1 EP0337148B1 (fr) 1994-06-15

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Application Number Title Priority Date Filing Date
EP89104677A Expired - Lifetime EP0337148B1 (fr) 1988-04-12 1989-03-16 Procédé de commande de l'encrage d'une machine d'impression

Country Status (5)

Country Link
US (1) US5122977A (fr)
EP (1) EP0337148B1 (fr)
JP (1) JPH074924B2 (fr)
CA (1) CA1328197C (fr)
DE (2) DE3812099C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2643017A1 (fr) * 1989-02-10 1990-08-17 Heidelberger Druckmasch Ag Procede de reglage de la coloration de produits imprimes
EP0585740A1 (fr) * 1992-09-02 1994-03-09 MAN Roland Druckmaschinen AG Méthode pour la commande du processus d'impression dans une presse d'imprimerie à cliché trame en particulier une machine à imprimer offset à feuilles
EP0600335A1 (fr) * 1992-11-28 1994-06-08 Heidelberger Druckmaschinen Aktiengesellschaft Méthode pour zonalement commander/régler l'encrage dans une machine d'impression
DE4104537C2 (de) * 1991-02-14 1999-05-12 Roland Man Druckmasch Verfahren zur Steuerung einer Farbführung einer Offset-Druckmaschine
WO2010022998A1 (fr) * 2008-08-23 2010-03-04 Manroland Ag Système de commande d’une machine d’impression

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BR0207825A (pt) * 2001-03-02 2004-04-27 Ackley Martinez Company Dba Mg Sistema e método de ajuste de impressão
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JP2003311933A (ja) * 2002-04-24 2003-11-06 Dainippon Screen Mfg Co Ltd パッチ測定装置およびそれを組み込んだ印刷装置
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JP4484541B2 (ja) * 2004-02-20 2010-06-16 大日本スクリーン製造株式会社 印刷機のインキ供給方法
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EP2439071A1 (fr) 2010-10-11 2012-04-11 KBA-NotaSys SA Motif de contrôle des couleurs pour la mesure optique de couleurs imprimées sur un substrat de type feuille ou toile à l'aide d'une presse d'impression multicolore et utilisations correspondantes
US11458724B2 (en) 2016-09-13 2022-10-04 Advanced Vision Technology (A.V.T.) Ltd. System and method for controlling color characteristics of a printed image
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2643017A1 (fr) * 1989-02-10 1990-08-17 Heidelberger Druckmasch Ag Procede de reglage de la coloration de produits imprimes
GB2229019A (en) * 1989-02-10 1990-09-12 Heidelberger Druckmasch Ag Controlling printing ink values
US5089977A (en) * 1989-02-10 1992-02-18 Heidelberger Druckmaschinen Ag Process for controlling the inking of printed products and apparatus for performing the process
GB2229019B (en) * 1989-02-10 1993-04-07 Heidelberger Druckmasch Ag Process for the control of the inking of printed products
DE4104537C2 (de) * 1991-02-14 1999-05-12 Roland Man Druckmasch Verfahren zur Steuerung einer Farbführung einer Offset-Druckmaschine
EP0585740A1 (fr) * 1992-09-02 1994-03-09 MAN Roland Druckmaschinen AG Méthode pour la commande du processus d'impression dans une presse d'imprimerie à cliché trame en particulier une machine à imprimer offset à feuilles
EP0600335A1 (fr) * 1992-11-28 1994-06-08 Heidelberger Druckmaschinen Aktiengesellschaft Méthode pour zonalement commander/régler l'encrage dans une machine d'impression
US5460090A (en) * 1992-11-28 1995-10-24 Heidelberger Druckmaschinen Ag Method and device for zonally controlling and regulating inking in a printing machine
WO2010022998A1 (fr) * 2008-08-23 2010-03-04 Manroland Ag Système de commande d’une machine d’impression

Also Published As

Publication number Publication date
JPH01314171A (ja) 1989-12-19
EP0337148B1 (fr) 1994-06-15
JPH074924B2 (ja) 1995-01-25
DE3812099A1 (de) 1989-10-26
US5122977A (en) 1992-06-16
CA1328197C (fr) 1994-04-05
DE58907872D1 (de) 1994-07-21
EP0337148A3 (en) 1990-08-22
DE3812099C2 (de) 1995-01-26

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