EP0337148B1 - Method for controlling the inking in a printing press - Google Patents
Method for controlling the inking in a printing press Download PDFInfo
- Publication number
- EP0337148B1 EP0337148B1 EP89104677A EP89104677A EP0337148B1 EP 0337148 B1 EP0337148 B1 EP 0337148B1 EP 89104677 A EP89104677 A EP 89104677A EP 89104677 A EP89104677 A EP 89104677A EP 0337148 B1 EP0337148 B1 EP 0337148B1
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- European Patent Office
- Prior art keywords
- inking
- location
- densities
- des
- density
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- 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.)
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- 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
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- 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
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- 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 a method for controlling a printing press according to the preamble of the main claim.
- a method for color control or color regulation of a printing press has already become known from EP 02 28 347 A1.
- a large number of reference fields are measured and evaluated photometrically.
- the actual color locations of the scanned reference fields are then compared with predetermined target color locations of the corresponding reference fields. If there is a discrepancy between the actual and the respective target color location, the ink guide elements of the printing press are controlled in the sense of a reduction in the color deviation. This process works reliably as long as specified, machine-specific boundary conditions, in particular the maximum permissible layer thicknesses / densities, are not 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 Tollenaar function. Since the method according to the invention can be used for calculation, output and / or input on the basis of density values or layer thicknesses, the term layer thickness / density is used below.
- the object of the invention is to increase the print quality in an economical manner and to allow a tolerable approximation to a target color location given the maximum permissible layer thicknesses / densities.
- a first auxiliary color location is calculated on a straight line connecting the actual color location and the target color location, for which one of the printing inks has its maximum permissible layer thickness / density, by changing the layer thicknesses / densities of further printing inks a new target color location is calculated which is within a minimum tolerance of the target color location, so that when the maximum permissible layer thickness / density of a second printing ink is reached, the layer thickness (s) / density (s) of the remaining printing ink (s) is changed ( ) until a minimum distance to the target color location, weighted with the tolerances, is reached , and that the new color location thus calculated Cor
- a further development of the method according to the invention provides that the tolerance is specified as a color tolerance space, that after the calculation of the first auxiliary color location a level comprising the first auxiliary 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 color 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 that maximum permissible layer thickness / density is, on a straight line connecting the auxiliary color locus (E1) and the new target color locus, a second auxiliary color locus (E2) is calculated, at which one of the other printing inks reaches the maximum permissible layer thickness / density that a straight line is calculated on which those color locations are located which can be changed by changing the layer thickness / you te a third printing ink can be achieved, and that the point of the intersection line is determined as the new target color
- the printer can allow an increase in the layer thicknesses / densities or an extension of the tolerances.
- 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 elements.
- 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 is to be carried out.
- the color tolerance range or the color tolerance space within the color space 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 being independent of one another.
- a color 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 color 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, wherein 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, then 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.
- 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 adds 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” is preferably used for the calculations within the inventive method, which is smaller than the tolerance specified by the printer .
- This is shown in Fig. 3 as a dashed ellipsoid, which is similar to the ellipsoids due to the tolerances entered. In the following, however, the terms tolerance and tolerance ellipsoid are used for the sake of simplicity.
- 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 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, in this case the center point of the ellipse. This becomes the new setpoint Es'.
- Es' In the case of an imaginary ellipse, It ′ 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 that 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, is the first to reach the maximum permissible layer thickness / density in proportion to their required change in deltaSs.
- 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 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 be the center point if the ellipsoid were enlarged. 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)
Description
Die Erfindung betrifft ein Verfahren zur Forbsteuerung einer Druckmaschine gemäß den Oberbegriff des Hauptanspruchs.The invention relates to a method for controlling a printing press according to the preamble of the main claim.
Aus der EP 02 28 347 A1 ist bereits ein Verfahren zur Farbsteuerung oder Farbregelung einer Druckmaschine bekannt geworden. Um eine optimale Angleichung des Farbeindruckes eines Druckproduktes und eines Originals zu erreichen, werden eine Vielzahl von Bezugsfeldern fotometrisch gemessen und ausgewertet. Anschließend werden die Ist-Farborte der abgetasteten Bezugsfelder mit vorgegebenen Soll-Farborten der entsprechenden Bezugsfelder verglichen. Bei einer Abweichung zwischen dem Ist- und des jeweiligen Soll-Farbort werden die Farbführungsorgane der Druckmaschine im Sinne einer Verringerung der Farbabweichung gesteuert. Dieses Verfahren arbeitet verläßlich, solange vorgegebene, maschinenspezifische Randbedingungen, insbesondere die maximal zulässigen Schichtdicken/Dichten, nicht überschritten werden.A method for color control or color regulation of a printing press has already become known from EP 02 28 347 A1. In order to achieve an optimal matching of the color impression of a printed product and an original, a large number of reference fields are measured and evaluated photometrically. The actual color locations of the scanned reference fields are then compared with predetermined target color locations of the corresponding reference fields. If there is a discrepancy between the actual and the respective target color location, the ink guide elements of the printing press are controlled in the sense of a reduction in the color deviation. This process works reliably as long as specified, machine-specific boundary conditions, in particular the maximum permissible layer thicknesses / densities, are not exceeded.
Aus der EP 03 21 402 A1 (Stand der Technik nach Artikel 54(3) EPÜ für die benannten Vertragsstaaten mit Ausnahme von Schweden) ist bereits ein Verfahren zur Farbsteuerung oder Farbregelung einer Druckmaschine bekannt geworden, das die Randbedingung "Maximal zulässige Schichtdicken/Dichten in den einzelnen Druckfarben" berücksichtigt . Den maximal zulässigen Schichtdicken/Dichten, die bei einem Farbabgleich zwischen Ist- und Soll-Farbort nicht überschritten werden dürfen, entspricht ein Farbkorrekturraum um den Ist-Farbort. Liegt der Soll-Farbort außerhalb dieses Farbkorrekturraumes, so wird ein Punkt auf der Oberfläche des Farbkorrekturraumes als Ersatz-Soll-Farbort angesteuert.From EP 03 21 402 A1 (state of the art according to Article 54 (3) EPC for the designated contracting states with the exception of Sweden), a method for color control or color regulation of a printing press has already become known which meets the boundary condition "maximum permissible layer thicknesses / densities in the individual printing inks ". A color correction space around the actual color location corresponds to the maximum permissible layer thicknesses / densities, which must not be exceeded in a color comparison between the actual and target color location. If the target color location lies outside this color correction space, a point on the surface of the color correction space is activated as a replacement target color location.
Gesteuert werden bei der Druckmaschine letztlich die Schichtdicken. Bei bekannten Systemen erfolgen Ein- und Ausgaben dazu jedoch meist in Dichtewerten, die mit den Werten für die Schichtdicken durch die Tollenaar-Funktion zusammenhängen. Da bei dem erfindungsgemäßen Verfahren eine Berechnung, Ausgabe und/oder Eingabe auf der Grundlage von Dichtewerten oder von Schichtdicken erfolgen kann, wird im folgenden die Bezeichnung Schichtdicke/Dichte verwendet.The layer thicknesses are ultimately controlled in the printing press. In known systems, however, inputs and outputs are usually made in density values which are related to the values for the layer thicknesses through the Tollenaar function. Since the method according to the invention can be used for calculation, output and / or input on the basis of density values or layer thicknesses, the term layer thickness / density is used below.
Der Erfindung liegt die Aufgabe zugrunde, in wirtschaftlicher Weise die Druckqualität zu erhöhen und bei vorgegebenen maximal zulässigen Schichtdicken/Dichten eine tolerierbare Annäherung an einen Soll-Farbort zu ermöglichen.The object of the invention is to increase the print quality in an economical manner and to allow a tolerable approximation to a target color location given the maximum permissible layer thicknesses / densities.
Diese Aufgabe wird durch den kennzeichnenden Teil des Hauptanspruchs gelöst.This problem is solved by the characterizing part of the main claim.
In einer Weiterbildung des erfindungsgemäßen Verfahrens wird vorgeschlagen, eine weitgehende Annäherung des unter Beachtung der maximal zulässigen Schichtdicken/Dichten bestimmten neuen Soll-Farbortes an den Soll-Farbort dadurch zu erreichen, daß für den Fall, daß innerhalb von maximal zulässigen Schichtdicken/Dichten der Soll-Farbort nicht erreicht werden kann, auf einer den Ist-Farbort und den Soll-Farbort verbindenden Geraden ein erster Hilfs-Farbort berechnet wird, für welchen eine der Druckfarben ihre maximal zulässige Schichtdicke/Dichte aufweist, daß durch Ändern der Schichtdicken/Dichten weiterer Druckfarben ein neuer Soll-Farbort berechnet wird, der innerhalb einer minimalen Toleranz zum Soll-Farbort liegt, daß bei Erreichen der maximal zulässigen Schichtdicke/Dichte einer zweiten Druckfarbe die Schichtdicke(n)/Dichte(n) der verbleibenden Druckfarbe(n) verändert wird (werden), bis ein minimaler mit den Toleranzen gewichteter Abstand zum Soll-Farbort erreicht ist, und daß dem somit berechneten neuen Farbort entsprechende Daten an die Farbführungsorgane der Druckmaschine gegeben werden, wenn der neue Soll-Farbort innerhalb einer vorgegebenen Farbtoleranz um den Soll-Farbort liegt.In a further development of the method according to the invention, it is proposed to achieve a broad approximation of the new target color location to the target color location, taking into account the maximum permissible layer thicknesses / densities, in such a way that in the event that the target is within the maximum permissible layer thicknesses / densities Color location cannot be reached, a first auxiliary color location is calculated on a straight line connecting the actual color location and the target color location, for which one of the printing inks has its maximum permissible layer thickness / density, by changing the layer thicknesses / densities of further printing inks a new target color location is calculated which is within a minimum tolerance of the target color location, so that when the maximum permissible layer thickness / density of a second printing ink is reached, the layer thickness (s) / density (s) of the remaining printing ink (s) is changed ( ) until a minimum distance to the target color location, weighted with the tolerances, is reached , and that the new color location thus calculated Corresponding data are given to the ink guide elements of the printing press when the new target color location lies within a predetermined color tolerance around the target color location.
Eine Weiterbildung des erfindungsgemäßen Verfahrens sieht vor, daß die Toleranz als Farbtoleranzraum vorgegeben ist, daß nach der Berechnung des ersten Hilfs-Farbortes eine den ersten Hilfs-Farbort und alle Farborte, welche durch Veränderung der Schichtdicke/Dichte der weiteren Druckfarben erreichbar sind, umfassende Ebene berechnet wird, daß geprüft wird, welcher Punkt der Ebene einen minimalen Farbtoleranzraum benötigt und dieser Punkt als neuer Soll-Farbort festgelegt wird, daß für den Fall, daß bei dem neuen Soll-Farbort die Schichtdicke/Dichte mindestens einer der weiteren Druckfarben größer als die maximal zulässige Schichtdicke/Dichte ist, auf einer den Hilfs-Farbort (E1) und den neuen Soll-Farbort verbindenden Geraden ein zweiter Hilfs-Farbort (E2) berechnet wird, bei welchem eine der weiteren Druckfarben die maximal zulässige Schichtdicke/Dichte erreicht, daß eine Gerade berechnet wird, auf der diejenigen Farborte liegen, die durch Ändern der Schichtdicke/Dichte einer dritten Druckfarbe erreicht werden können, und daß der Punkt der Schnittgeraden als neuer Soll-Farbort festgelegt wird, bei dem der Farbabstand zum Soll-Farbort minimal ist.A further development of the method according to the invention provides that the tolerance is specified as a color tolerance space, that after the calculation of the first auxiliary color location a level comprising the first auxiliary 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 color 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 that maximum permissible layer thickness / density is, on a straight line connecting the auxiliary color locus (E1) and the new target color locus, a second auxiliary color locus (E2) is calculated, at which one of the other printing inks reaches the maximum permissible layer thickness / density that a straight line is calculated on which those color locations are located which can be changed by changing the layer thickness / you te a third printing ink can be achieved, and that the point of the intersection line is determined as the new target color location, at which the color distance from the target color location is minimal.
Gemäß einer vorteilhaften Weiterbildung des erfindungsgemäßen Verfahrens kann angezeigt werden, wenn kein Soll-Farbort ermittelt werden kann, der innerhalb des vorhandenen Farbtoleranzbereiches bzw. Farbtoleranzraumes liegt und für den die Schichtdicke/Dichten nicht größer als die maximal zulässige Schichtdicke/Dichte sind. Durch eine entsprechende Eingabe kann der Drucker eine Erhöhung der Schichtdicken/Dichten oder eine Erweiterung der Toleranzen zulassen.According to an advantageous development of the method according to the invention, it can be indicated if no desired color location can be determined which lies within the existing color tolerance range or color tolerance space and for which the layer thickness / densities are not greater than the maximum permissible layer thickness / density. With an appropriate entry, the printer can allow an increase in the layer thicknesses / densities or an extension of the tolerances.
Dieses Verfahren ermöglicht neben einer weitgehend automatischen Steuerung ein manuelles Eingreifen, wenn ein Abwägen zwischen verschiedenen Qualitätsparametern erforderlich ist. Obwohl das Verfahren in erster Linie für Mehrfarbendruck vorgesehen ist, kann es auch bei Einfarbendruck angewendet werden. Durch laufende Abtastung von Druckbögen und entsprechend häufige Nachsteuerung der Farbführungsorgane kann das erfindungsgemäße Verfahren auch in einem geschlossenen Regelkreis durchgeführt werden.In addition to a largely automatic control, this method enables manual intervention if a weighing up between different quality parameters is required. Although 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 elements.
Eine Weiterbildung des Verfahrens sieht vor, daß bei Nichterreichen des Soll-Farbortes oder des Toleranzbereichs um den Soll-Farbort Werte zur Erweiterung des Toleranzbereichs und/oder zur Erhöhung einer oder mehrerer Schichtdicken/Dichten ausgegeben werden. Dabei kann diese Ausgabe auch in Form eines Vorschlages erfolgen, auf den der Drucker lediglich eine von mehreren vorgegebenen Antworten einzugeben hat. So kann beispielsweise im Anschluß an die Ausgabe ein Eingabe abgefragt werden, ob die vorgeschlagene Erweiterung des Toleranzbereichs oder ob die vorgeschlagene Erhöhung mindestens einer der Schichtdicken/Dichten vorgenommen werden soll.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 is to be carried out.
Darüber hinaus ist vorgesehen, daß in einer besonders vorteilhaften Weise der Farbtoleranzbereich bzw. der Farbtoleranzraum innerhalb des Farbraumes die Form eines Ellipsoiden aufweisen, dessen längste Achse in Richtung der Helligkeitsachse liegt. Es sind jedoch auch andere Formen denkbar und möglich, wie beispielsweise die eines Quarders, wobei die Toleranzen in Richtung der Helligkeitsachse L und Richtung der beiden Farbachsen a, b unabhängig voneinander sind. Ein Farbtoleranzraum, bei welchem die Toleranzen in Richtung der beiden Farbachsen voneinander abhängen, die Toleranz in Richtung der Helligkeitsachse jedoch unabhängig von diesen ist, kann durch einen Zylinder vorgegeben werden, dessen Achse parallel zur Helligkeitsachse verläuft.In addition, it is provided that in a particularly advantageous manner the color tolerance range or the color tolerance space within the color space have the shape of an ellipsoid, the longest axis of which lies in the direction of the brightness axis. However, 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 being independent of one another. A color 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.
Die Erfindung wird anhand der nachfolgenden Figuren erläutert.The invention is explained on the basis of the following figures.
Es zeigt:
- Fig. 1
- als Blockschaltbild eine Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens,
- Fig. 2
- einen Programmablaufplan
und - Fig. 3
- bis Fig. 11 Darstellungen verschiedener Schritte des erfindungsgemäßen Verfahrens als Diagramme im Farbraum.
- Fig. 1
- as a block diagram a device for performing the method according to the invention,
- Fig. 2
- a program flow chart
and - Fig. 3
- to 11 representations of different steps of the method according to the invention as diagrams in the color space.
Gleiche Teile sind in den Figuren mit gleichen Bezugszeichen versehen.Identical parts are provided with the same reference symbols in the figures.
Bei der Einrichtung nach Fig. 1 ist eine Druckmaschine 1 in an sich bekannter Weise mit Farbführungsorganen 2 vorgesehen, mit deren Hilfe die Farbzuführung und damit die Schichtdicke/Dichte durch Stellsignale steuerbar ist. Diese Stellsignale werden den Farbführungsorganen 2 von einer Farbsteuerungseinheit 3 zugeführt, welche die Stellsignale aufgrund von Farbsteuerdaten erzeugt, die in einem Ein/Ausgabegerät 4 in Verbindung mit einer Meßwertverarbeitungseinheit 5 erzeugt werden. Von den Farbführungsorganen 2 ist eine Istwert-Rückmeldung zur Ein/Ausgabeeinheit 4 vorgesehen.1, a
Auf einem von der Druckmaschine gedruckten Druckbogen 6 befindet sich ein Druckkontrollstreifen 7 mit mehreren Farbmeßfeldern. Diese werden von einem Meßkopf 8 abgetastet, der Teil eines Farbmeßgerätes mit einem Spektrometer 9 ist. Eine elektronische Meßkopfsteuereinheit 10 steuert die Position des Meßkopfes 8, wobei die Ist-Position des Meßkopfes 8 an die Meßkopfsteuereinheit 10 und weiter an die Meßwertverarbeitungseinheit 5 weitergeleitet werden kann. Vom Spektrometer 9 werden Meßwerte an die Meßwertverarbeitungseinheit 5 geleitet.A
Mit der in Fig. 1 dargestellten Einrichtung ist nach dem im folgenden näher erläuterten erfindungsgemäßen Verfahren eine Steuerung bzw. Regelung der Schichtdicken/Dichten im Sinne einer Optimierung der Farbwiedergabe möglich. Dabei werden bei Korrekturen, die ein Abwägen verschiedener Qualitätsparameter erforderlich machen, dem Drucker über das Ein/Ausgabegerät 4 Vorschläge gemacht, die er durch entsprechende Eingaben befolgen oder abändern kann. Gemäß dem Programmablaufplan nach Fig. 2 werden bei 21 die Meßwerte des Spektrometers, also die Istwerte, abgefragt. Bei 22 werden die Sollwerte, die Toleranzen und die jeweilige Schichtdicke/Dichte Smax einem Speicher entnommen. Durch eine Subtraktion 23 werden die Differenzen zwischen den Meßwerten und den Sollwerten gebildet, aus welchen die Schichtdicken/Dichten-Änderungen deltaSs bei 24 errechnet werden. Im Programmteil 25 werden aus den Istwerten die bestehenden Schichtdicken/Dichten Sist errechnet. Durch Addition von Sist und deltaSs bei 26 entstehen die Sollwerte für die Schichtdicken/Dichten Sneu. Diese werden bei 20 mit den Maximalwerten für die Schichtdicken/Dichten verglichen.With the device shown in FIG. 1, a control or regulation of the layer thicknesses / densities is possible in the sense of an optimization of the color rendering according to the method according to the invention explained in more detail below. In the case of corrections that make it necessary to weigh different quality parameters, the printer is made 4 suggestions via the input / output device, which he can follow or change by making appropriate entries. According to the program flow chart according to FIG. 2, the measured values of the spectrometer, ie the actual values, are queried at 21. At 22, 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
In Abhängigkeit von dem Ergebnis dieses Vergleichs wird bei 27 das Programm verzweigt. Sind die Sollschichtdicken/Dichten Sneu nicht größer als die maximal zulässigen Schichtdicken/Dichten Smax, so werden die den Soll-Schichtdicken/Dichten Sneu entsprechenden Daten der Farbsteuereinheit 3 (Fig. 1) zugeführt und die Farbführungsorgane 2 der Druckmaschine 1 entsprechend gesteuert.Depending on the result of this comparison, 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
Sind jedoch die Soll-Schichtdicken/Dichten Sneu größer als die maximal zulässigen Schichtdicken/Dichten Smax, so wird bei 28 ein optimaler Punkt im Farbraum berechnet, bei dem die Schichtdicken/Dichten kleiner als die zulässigen Schichtdicken/Dichten Smax sind. Bei 29 wird dann entschieden, ob dieser Farbort innerhalb der Toleranzen liegen. Ist dieses der Fall, wird wiederum im Programmteil 30 die Ausgabe der Farbsteuerdaten und deren Übertragung an die Farbsteuereinheit 3 (Fig. 1) veranlaßt.However, if the target layer thicknesses / densities Sneu are greater than the maximum permissible layer thicknesses / densities Smax, then 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. At 29 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
Liegt der Farbort jedoch außerhalb der Toleranzen, so werden im Programmteil 31 alternative Vorschläge für Toleranzen und Schichtdicken/Dichten errechnet und bei 32 dem Drucker angezeigt.However, if the color location is outside the tolerances, alternative suggestions for tolerances and layer thicknesses / densities are calculated in
Im Programmteil 33 wird die Druckereingabe abgefragt. Beinhaltet diese Eingabe eine Erweiterung der Toleranzen, so werden nach der Verzweigung 34 die errechneten Farbsteuerdaten ausgegeben und übertragen. Hat der Drucker keine neue Toleranzen, jedoch für die zulässigen Schichtdicken/Dichten größere Werte eingegeben, so wird nach der Verzweigung 35 bei 28 ein neuer Farbort errechnet. Liegt dieser innerhalb der Toleranzen, erfolgt eine Ausgabe der Farbsteuerdaten. Ist dieses nicht der Fall, werden wiederum alternative Vorschläge errechnet, so daß der Drucker erneut die Gelegenheit zur Eingabe neuer Toleranzen oder neuer zulässiger Schichtdicken/Dichten hat. Gibt der Drucker bei 33 weder neue Toleranzen noch neue zulässige Schichtdicken/Dichten ein, so wird nach dem Durchlauf der Verzweigungen 34 und 35 der Drucker bei 36 gefragt, ob ein Druck außerhalb der zulässigen Toleranzen erfolgen soll. Bejaht der Drucker das durch eine entsprechende Eingabe, werden nach der Verzweigung 37 entsprechende Farbsteuerdaten an die Farbsteuerungeinheit 3 ausgegeben. Läßt jedoch der Drucker keinen Druck außerhalb der Toleranzen zu, so führt dieses zu einem Abbruch bei 38.In
Bevor anhand der Figuren 4 bis 11 an einem Beispiel auf einzelne Schritte des erfindungsgemäßen Verfahrens eingegangen wird, erfolgt eine Erläuterung der Begriffe Toleranz und Toleranz-Bereich mit Hilfe von Fig. 3 am Beispiel eines Toleranz-Ellipsoiden. Im Ursprung des den Farbraum darstellenden Koordinatensystems L, a, b gemäß Fig. 3 sei der Sollwert für die zu druckende Farbe angenommen. Toleriert werden alle Istwerte, die innerhalb eines Ellipsoiden mit den Halbachsen deltaL, deltaA und deltaB liegen. Da Helligkeitsabweichungen vom Menschen eher als Farbstiche akzeptiert werden, ist hier deltaL größer als deltaA bzw. deltaB. Die dem jeweiligen Druckauftrag zugrundezulegenden Toleranzwerte sind abhängig von der jeweils erforderlichen Druckqualität und können vom Drucker eingegeben werden. Da sich durch Meßungenauigkeiten, durch die Linearisierung und durch Maschinenschwankungen Abweichungen zwischen den gemessenen und berechneten Daten einerseits und dem gedruckten Bild andererseits ergeben, wird vorzugsweise für die Berechnungen innerhalb des erfindungsgemäßen Verfahrens eine "Rechentoleranz" verwendet, die kleiner als die vom Drucker angegebene Toleranz ist. Dieses ist in Fig. 3 als gestrichelter Ellipsoid dargestellt, welcher den Ellipsoiden aufgrund der eingegebenen Toleranzen ähnlich ist. Im folgenden werden jedoch der Einfachheit halber die Begriffe Toleranz und Toleranz-Ellipsoid verwendet.Before individual steps of the method according to the invention are discussed with reference to FIGS. 4 to 11, the terms tolerance and tolerance range are explained with the aid of FIG. 3 using the example of a tolerance ellipsoid. In 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. Since there are deviations between the measured and calculated data on the one hand and the printed image on the other hand due to measurement inaccuracies, linearization and machine fluctuations, a "calculation tolerance" is preferably used for the calculations within the inventive method, which is smaller than the tolerance specified by the printer . This is shown in Fig. 3 as a dashed ellipsoid, which is similar to the ellipsoids due to the tolerances entered. In the following, however, the terms tolerance and tolerance ellipsoid are used for the sake of simplicity.
Ein erster Verfahrensschritt wird anhand von Fig. 4 erläutert. Dabei sind der mit dem Spektrometer 9 gemessene Farbort Eist und der Soll-Farbort Esoll durch eine gerade Linie verbunden, deren Gleichung ebenfalls in Fig. 4 dargestellt ist. Dabei bedeuten deltaL, deltaa und deltab die Differenzen der Koordinaten des Soll-Farbortes und des Ist-Farbortes; deltaS1s, deltaS2s und deltaS3s die Differenzen der Schichtdicken/Dichten der Druckfarben und A eine Konstante. Lambda ist die unabhängige Variable, die den Ort auf der Geraden kennzeichnet.A first method step is explained with reference to FIG. 4. The color locus Eist measured with the
Wie bereits im Zusammenhang mit dem Programmablaufplan gemäß Fig. 2 erläutert, sind keine weiteren Rechenschritte erforderlich, wenn die Schichtdicken/Dichten für den Farbort Esoll innerhalb der maximal zulässigen Schichtdicken/Dichten liegen. Ist dieses jedoch nicht der Fall, so wird diejenige Druckfarbe ermittelt, die bei gleicher Änderung aller drei Druckfarben proportional zu der erforderlichen Änderung deltaSs als erste die maximal zulässige Schichtdicke/Dichte erreicht. Diese Druckfarbe wird im folgenden als F1 bezeichnet.As already explained in connection with the program flow chart according to FIG. 2, no further calculation steps are necessary if 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.
Nach der Festlegung der Druckfarbe F1 wird derjenige Farbort E1 auf der Verbindungsgeraden zwischen Eist und Esoll berechnet, bei dem die Druckfarbe F1 die maximal zulässige Schichtdicke/Dichte erreicht hat. Der folgende Schritt wird anhand von Fig. 5 erläutert. Es wird eine Ebene derjenigen Farborte berechnet, die durch die Änderung der beiden restlichen Druckfarben erreicht werden können. Diese Ebene ist in Fig. 5 sowie in weiteren Figuren schraffiert hervorgehoben.After the definition of the printing ink 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.
Bei dem in Fig. 6 dargestellten Verfahrensschritt erfolgt ein Schnitt der Ebene mit dem Toleranz-Ellipsoiden. Hierdurch wird die Menge der Farborte bestimmt, die mit den beiden Druckfarben F2 und F3 erreicht werden können und innerhalb des Toleranz-Bereichs liegen. Schneidet die Ebene den Toleranz-Ellipsoiden, so entsteht eine reelle Ellipse. Meidet die Ebene den Ellipsoiden, so ist die Ellipse imaginär.In the method step shown in FIG. 6, the plane is cut with the tolerance ellipsoid. This determines the amount of color locations that match the both 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.
Als nächster Verfahrensschritt erfolgt die Bestimmung des Punktes, für den der notwendige Toleranz-Raum minimal wird, hier des Mittelpunktes der Ellipse. Dieser wird zum neuen Sollwert Es′. Im Falle einer imaginären Ellipse ist Es′ derjenige Punkt auf der Ebene, der bei einem vergrößerten Ellipsoiden der Mittelpunkt der Schnittellipse wäre. Dabei ist Es′ immer reell, auch bei einer imaginären Ellipse.The next step in the process is to determine the point for which the necessary tolerance space becomes minimal, in this case the center point of the ellipse. This becomes the new setpoint Es'. In the case of an imaginary ellipse, It ′ 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.
Nach der in Fig. 7 dargestellten Ermittlung des neuen Sollwertes Es′, werden neue Sollwerte für die Schichtdicken/Dichten errechnet und ausgegeben, sofern eine reelle Ellipse vorliegt und die Schichtdicken/Dichten für Es′ nicht größer als Smax sind. Ist letzteres nicht der Fall, so wird vom Farbort E1 ausgehend die Druckfarbe ermittelt, die bei gleicher Änderung der beiden Druckfarben F2 und F3 proportional zu deren erforderlichen Änderung deltaSs als erste die maximal zulässige Schichtdicke/Dichte erreicht. Der Punkt E2 liegt auf der Verbindungsgeraden zwischen E1 und Es′ (Fig. 8).After the determination of the new setpoint Es 'shown in FIG. 7, new setpoints for the layer thicknesses / densities are calculated and output, provided that 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, is the first to reach the maximum permissible layer thickness / density in proportion to their required change in deltaSs. The point E2 lies on the connecting line between E1 and Es' (Fig. 8).
In ähnlicher Weise, wie gemäß Fig. 5 eine Ebene der Farborte errechnet wurde, welche durch Änderung der Druckfarben F2 und F3 erreicht werden konnten, wird in einem weiteren Verfahrensschritt eine Gerade berechnet, die durch eine weitere Änderung der Druckfarbe F3 beschrieben wird. Diese Gerade ist in Fig. 9 mit S3′ bezeichnet. Durch Schneiden der Geraden S3′ mit der Toleranz-Ellipse wird die Menge derjenigen Farborte bestimmt, die mit der dritten Druckfarbe erreicht werden können und die innerhalb des Toleranzsbereichs liegen. Meidet die Gerade die Ellipse, so sind die Schnittpunkte imaginär, liegt ein Schnitt vor, so sind sie reell.5, 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 '. 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 line avoids the ellipse, see above if the intersections are imaginary, if there is an intersection, they are real.
In einem weiteren Verfahrensschritt wird der Punkt auf der Geraden berechnet, bei dem der notwendige Toleranz-Raum minimal wird - der Mittelpunkt der von der Geraden gebildeten Sehne - und als neuer Sollwert Es˝ angenommen. Im Falle von imaginären Schnittpunkten, ist Es˝ derjenige Punkt, der sich bei einer Vergrößerung des Ellipsoiden als Mittelpunkt ergäbe. Dabei ist Es˝ immer reell, auch bei imaginären Schnittpunkten. Die Bildung von Es˝ ist in Fig. 10 für den Fall, daß die Gerade S3′ den Toleranz-Ellipsoiden nicht schneidet. Ist bei Es˝ die Schichtdicke/Dichte der Druckfarbe F3 größer als die maximal zulässige Schichtdicke/Dichte Smax, so wird derjenige Farbort Es‴ bestimmt, für welchen die Schichtdicke/Dichte der maximal zulässigen Schichtdicke/Dichte Smax entspricht.In a further process step, 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˝. In the case of imaginary intersections, Es˝ is the point that would be the center point if the ellipsoid were enlarged. 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. If the layer thickness / density of the printing ink F3 is greater than the maximum permissible layer thickness / density Smax at Es˝, the color location Es ‴ is determined for which the layer thickness / density corresponds to the maximum permissible layer thickness / density Smax.
Je nach Gegebenheiten im einzelnen werden einige oder alle der bisher erläuterten Verfahrensschritte durchgeführt. Für den Fall, daß der Soll-Farbort Esoll nicht ohne Überschreitung der maximal zulässigen Schichtdicken/Dichten erreicht werden kann, wird einer der Farborte Es′, Es˝ und Es‴ als Soll-Farbort errechnet. Dieser wird im folgenden als Es* bezeichnet. Liegt Es* innerhalb des Toleranz-Ellipsoiden, so wird Es* zum neuen Sollwert für die Regelung bestimmt. Liegt Es* jedoch außerhalb des Toleranz-Ellipsoiden, so werden dem Drucker folgende Möglichkeiten zur Wahl gestellt:
- 1. Es* wird als Sollwert zur Regelung verwendet, auch wenn Es* außerhalb des Toleranz-Ellipsoiden liegt.
- 2. Erhöhung der Toleranzen: Berechnen eines größeren Toleranz-Ellipsoiden gleicher Form (d. h. deltaL, deltaA und deltaB stehen im gleichen Verhältnis) derart, daß der Farbort Es* innerhalb der Toleranz liegt.
- 3. Berechnung der notwendigen Änderungen der maximalen Schichtdicken/Dichten derart, daß ein Farbort P auf der Verbindungsgeraden Eist-Esoll innerhalb bzw. am Rande des Toleranz-Ellipsoiden gedruckt werden kann. Dazu werden zunächst der Punkt P (Fig. 11) und die dort notwendigen Schichtdicken/Dichten berechnet. Danach wird geprüft, ob die Schichtdicke/Dichte einer oder zweier Druckfarben unterhalb des maximal zulässigen Wertes liegen. Ist dieses der Fall, so werden der Verfahrensschritt gemäß Fig. 4 und die darauf folgenden durchgeführt, um die beste Annäherung an den Farbort Esoll ohne weitere Erhöhung der maximalen Schichtdicken/Dichten zu erreichen.
- 1. It * is used as a setpoint for control, even if It * lies outside the tolerance ellipsoid.
- 2. Increase the tolerances: Calculate a larger tolerance ellipsoid of the same shape (ie deltaL, deltaA and deltaB are in the same ratio) such that the Color locus It * is within tolerance.
- 3. Calculation of the necessary changes in the maximum layer thicknesses / densities such that a color location P can be printed on the connecting line Eist-Esoll within or on the edge of the tolerance ellipsoid. For this purpose, point P (FIG. 11) and the layer thicknesses / densities required there are first calculated. It is then checked whether the layer thickness / density of one or two printing inks is below the maximum permissible value. If this is the case, the method step according to FIG. 4 and the subsequent steps are carried out in order to achieve the best approximation to the color locus Esoll without further increasing the maximum layer thicknesses / densities.
Claims (11)
- Method for the inking control/inking regulation of a printing machine (1), measuring fields (7) printed onto a printing sheet (6) being scanned optically in the printing machine (1), the inking locations (EAct) of the measuring fields (7) being determined from the measured values, the actual inking location (EAct) obtained for a particular measuring field (7) by means of the scan being compared with a predetermined desired inking location (EDes), and, in the event of an inking distance between the actual inking location (EAct) and the desired inking location (EDes), starting from the actual inking location (EAct) the layer thicknesses (Si)/densities of printing inks (Fi), necessary for reaching the desired inking location (EDes), and corresponding regulating quantities for adjusting ink-guide members (2) on the printing machine (1) being calculated, characterized in that- in the event that the desired inking location (EDes) is located outside maximum permissible layer thicknesses (Si max)/densities, there is determined in the region between the actual inking location (EAct) and the desired inking location (EDes) a new desired inking location (ES') which is located within the maximum permissible layer thicknesses (Si)/densities and of which the inking distance from the desired inking location (EDes) is minimal, and- in that this new desired inking location (ES') is aimed for by means of the ink-guide members (2) of the printing machine (1) when it is located within a predetermined inking tolerance (within predetermined inking tolerances) around the desired inking location (EDes).
- Method according to Claim 1, characterized in that, in the event that the desired inking location (EDes) is located outside maximum permissible layer thicknesses (Si max)/densities, there is calculated, on a straight line connecting the actual inking location (EAct) and the desired inking location (EDes), a first auxiliary inking location (E1), for which one of the printing inks (Fi) has its maximum permissible layer thickness/density, in that, as a result of a variation in the layer thicknesses (Si)/densities of the further printing inks (Fi), there is calculated a new desired inking location (ES') which is located at a minimum distance from the desired inking location (EDes) within the inking tolerance, in that, when the maximum permissible layer thickness (Si max)/density of a second printing ink is reached, the layer thickness or layer thicknesses (Si)/density or densities of the remaining printing ink or printing inks (Fi) is (are) varied until a minimum distance from the desired inking location (EDes) is reached, and in that data corresponding to the new desired inking location (ES') are transmitted to the ink-guide members (2) of the printing machine (1) when the new desired inking location (ES') is located within a predetermined inking tolerance around the desired inking location (EDes).
- Method according to Claim 2, characterized in that the inking tolerance is predetermined as an inking-tolerance space, in that, after the calculation of the first auxiliary inking location (E1), a plane comprising the first auxiliary inking location (E1) and all the inking locations which can be reached by varying the layer thicknesses densities of the further printing inks (Fi) is calculated, in that a check is made as to which point on the plane is at a minimum inking distance from the desired inking location (EDes) for a given form of the inking-tolerance space, and in that this point is fixed as a new desired inking location (ES'), in that, in the event that, at the new desired inking location (ES'), the layer thickness (Si)/density of at least one of the further printing inks is higher than the maximum permissible layer thickness (Si max)/density, there is calculated, on a straight line connecting the first auxiliary inking location (E1) and the new desired inking location (ES'), a second auxiliary inking location (E2), at which one of the further printing inks (Fi) reaches the maximum permissible layer thickness (Si max)/density, in that there is calculated a straight line, on which are located those inking locations which can be reached by changing the layer thickness/density of a third printing ink, and in that the point at which the inking distance from the desired inking location (EDes) assumes a minimum is fixed on the straight line as a new desired inking location (ES'').
- Method according to Claim 3, characterized in that, in the event that, at the new desired inking location (ES''), the layer thickness (Si max)/density of the third printing ink is located above the maximum permissible layer thickness/density, a check is made as to whether there is located on the straight line and within the inking tolerance a desired inking location, for which the layer thickness/density is no higher than the maximum permissible layer density (Si max)/density, and which, if so, is fixed as a new desired inking location (ES''').
- Method according to one of Claims 1 to 4, characterized in that an indication is given when no new desired inking location (ES', ES'', ES'''), which is located within the inking-tolerance space and for which the layer thicknesses/densities are no higher than the maximum permissible layer thickness (Simax)/density, is found, and in that it is queried by an input whether a widening of the inking-tolerance space or an increase in the layer thicknesses/densities of the printing inks (Fi) is to be carried out.
- Method according to Claim 5, characterized in that, in the event of an increase in the layer thicknesses/densities of the printing inks (Fi), the point of intersection (P) of the straight line between the actual inking location (EAct) and the desired inking location (EDes) with the surface of the widened inking-tolerance space is calculated, and in that the layer thicknesses/densities of the printing inks (Fi), which are present at the point of intersection (P) and which, where appropriate, have not yet reached or exceeded the maximum permissible layer thickness (Si max)/density, are varied with the effect of minimizing the inking distance from the desired inking location (EDes).
- Method according to one of the preceding claims, characterized in that the inking-tolerance space has, in the inking space defined by the coordinates L, a and b, the shape of an ellipsoid, the largest axis of which extends parallel to the L-axis.
- Method according to one of Claims 1 to 6, characterized in that the inking-tolerance space has, in the inking space defined by the coordinates L, a and b, the shape of a cylinder, the axis of which extends parallel to the L-axis.
- Method according to one of Claims 1 to 7, characterized in that the inking-tolerance space has, in the inking space defined by the coordinates L, a and b, the shape of a cuboid, the axes of which extend parallel to the L-, a- and b-axes.
- Method according to Claim 6, characterized in that the necessary changes to the inking tolerances or to the maximum permissible layer thicknesses (Simax)/densities are indicated to the printer.
- Method according to one or more of the preceding claims, characterized in that an adjustment of the ink-guide members (2) and a subsequent printing and/or a calculation of a new desired inking location (ES', ES'', ES''') by means of the increased layer thicknesses (Si)/densities of the printing inks (Fi) or the widened inking tolerances take place only after a manual input.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE3812099A DE3812099C2 (en) | 1988-04-12 | 1988-04-12 | Process for color control of an offset printing press |
DE3812099 | 1988-04-12 |
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EP0337148A2 EP0337148A2 (en) | 1989-10-18 |
EP0337148A3 EP0337148A3 (en) | 1990-08-22 |
EP0337148B1 true EP0337148B1 (en) | 1994-06-15 |
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EP89104677A Expired - Lifetime EP0337148B1 (en) | 1988-04-12 | 1989-03-16 | Method for controlling the inking in a printing press |
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US (1) | US5122977A (en) |
EP (1) | EP0337148B1 (en) |
JP (1) | JPH074924B2 (en) |
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EP2439071A1 (en) | 2010-10-11 | 2012-04-11 | KBA-NotaSys SA | Color control pattern for the optical measurement of colors printed on a sheet-like or web-like substrate by means of a multicolor printing press and uses thereof |
EP2331331B2 (en) † | 2008-08-23 | 2015-03-18 | manroland sheetfed GmbH | Printing machine control system |
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DE3903981C2 (en) * | 1989-02-10 | 1998-04-09 | Heidelberger Druckmasch Ag | Process for controlling ink filling in a printing press |
DE3913382C2 (en) * | 1989-04-24 | 1995-12-14 | Heidelberger Druckmasch Ag | Process for controlling the ink flow of a printing press |
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-
1988
- 1988-04-12 DE DE3812099A patent/DE3812099C2/en not_active Expired - Fee Related
-
1989
- 1989-03-09 CA CA000593276A patent/CA1328197C/en not_active Expired - Fee Related
- 1989-03-16 DE DE58907872T patent/DE58907872D1/en not_active Expired - Fee Related
- 1989-03-16 EP EP89104677A patent/EP0337148B1/en not_active Expired - Lifetime
- 1989-04-12 JP JP1090903A patent/JPH074924B2/en not_active Expired - Lifetime
-
1991
- 1991-05-28 US US07/708,113 patent/US5122977A/en not_active Expired - Lifetime
Cited By (3)
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---|---|---|---|---|
EP2331331B2 (en) † | 2008-08-23 | 2015-03-18 | manroland sheetfed GmbH | Printing machine control system |
EP2439071A1 (en) | 2010-10-11 | 2012-04-11 | KBA-NotaSys SA | Color control pattern for the optical measurement of colors printed on a sheet-like or web-like substrate by means of a multicolor printing press and uses thereof |
WO2012049610A1 (en) | 2010-10-11 | 2012-04-19 | Kba-Notasys Sa | Color control pattern for the optical measurement of colors printed on a sheet or web substrate by means of a multicolor printing press and uses thereof |
Also Published As
Publication number | Publication date |
---|---|
DE3812099A1 (en) | 1989-10-26 |
DE3812099C2 (en) | 1995-01-26 |
CA1328197C (en) | 1994-04-05 |
JPH01314171A (en) | 1989-12-19 |
EP0337148A2 (en) | 1989-10-18 |
US5122977A (en) | 1992-06-16 |
JPH074924B2 (en) | 1995-01-25 |
EP0337148A3 (en) | 1990-08-22 |
DE58907872D1 (en) | 1994-07-21 |
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