EP0600335A1 - Méthode pour zonalement commander/régler l'encrage dans une machine d'impression - Google Patents

Méthode pour zonalement commander/régler l'encrage dans une machine d'impression Download PDF

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Publication number
EP0600335A1
EP0600335A1 EP93118739A EP93118739A EP0600335A1 EP 0600335 A1 EP0600335 A1 EP 0600335A1 EP 93118739 A EP93118739 A EP 93118739A EP 93118739 A EP93118739 A EP 93118739A EP 0600335 A1 EP0600335 A1 EP 0600335A1
Authority
EP
European Patent Office
Prior art keywords
color
target
location
tol
locus
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
EP93118739A
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German (de)
English (en)
Other versions
EP0600335B1 (fr
Inventor
Nikolaus Pfeiffer
Manfred Schneider
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
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Heidelberger Druckmaschinen AG
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Publication of EP0600335A1 publication Critical patent/EP0600335A1/fr
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Anticipated expiration legal-status Critical
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/50—Marks on printed material
    • B41P2233/51—Marks on printed material for colour quality control
    • 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

Definitions

  • the invention relates to a method and a device for zonal control of the ink guidance in a printing press with a plurality of printing units according to the preamble of claims 1 and 13.
  • the control of the color guidance in the running printing process is the most important possibility to influence the coloring and thus the image impression.
  • the aim of the color control is to achieve the best possible color match between an ok sheet and a printed product created in the production run.
  • control of the color guidance according to colorimetric variables is to be regarded as a significant improvement, since a regulation in the sense of a comparison of target and actual color locations is adapted in a good approximation to the color perception of the human eye.
  • a comparison between the actual color location and the target color location preferably takes place only if the actual color location lies outside a predetermined tolerance range around the target color location. On the one hand, this avoids constant rules that cause instabilities. On the other hand, the fact is taken into account that each measuring and control process can only be sensibly carried out within certain error limits.
  • the color tolerance E Tol around the target color location is selected in the color guide control in a printing press in such a way that the target color location lies in the middle of the tolerance range and the eye usually does not perceive any disturbing color changes in the printed image within the tolerance. It may well be that an actual color location with a larger red cast is perceived as acceptable for a slightly reddish target color location. However, if the actual color locus has a slight green tint with the same color difference, the image cannot be accepted.
  • Today's definition of the tolerance range either allows a color cast in green, blue and yellow or the tolerance must be chosen unnecessarily small. It can then happen that, for example, the green cast disturbs the visual sensation, ie in extreme cases it becomes waste printed, although the actual color location is within the color tolerance E Tol around the target color location.
  • the present invention is based on the object of specifying a method and a device which rule out an intolerable color cast in the printed image.
  • the object is achieved in that an actual color locus can only be tolerated if it is within the range around the target color locus in which no color change occurs (permissible range) and the color difference is smaller than E Tol .
  • the measuring range selected per color zone either lies in the subject of the printed product or else in a print control strip.
  • the selected area be in the vicinity of the achromatic axis (0,0, L).
  • the selected area is therefore a gray field in which all printing-relevant colors are represented.
  • the method according to the invention is advantageously further developed by the following configuration:
  • the permissible range "no color change" satisfies the condition h0 ⁇ ⁇ , where h0 denotes the hue angle h of the desired color locus E Soll and ⁇ the maximum permissible change in the hue angle h.
  • C min characterizes the accuracy limit with which any measurements or adjustment processes can be carried out on the ink guide elements of the printing press.
  • the target color location is replaced by a replacement target color location, which enables a maximum color tolerance E Tol '.
  • This replacement target color location is still on the connecting straight line between the achromatic point and target color location, but is moving further away Achromatic point away; E Tol 'is smaller than E Tol but larger than with a tolerance around E Soll without color change.
  • a third case to be treated separately occurs when the chroma C0 of the target color locus is less than the minimum possible chroma C min .
  • this minimum chroma C min characterizes the lower limit for the measuring accuracy when determining the color locations or for the setting accuracy of the ink metering elements in the individual printing units. It makes little sense here to place the condition on the tolerable actual color locations that they must be within the permissible range, since a color change can no longer be prevented within the tolerances (e.g. machine fluctuations are too great). In addition, small fluctuations in the target value must not lead to large fluctuations in the replacement target color location.
  • the coordinates of the replacement target color location are: ((E Tol + C0) / (1 + sin ⁇ ), h0, L0).
  • Fig. 1 shows a block diagram of an embodiment of the device according to the invention.
  • the printed product 2 created in the printing press is scanned by a photoelectric detector 5 at certain image points 4a, 4b. Either these image points 4a, 4b lie in the print control strip 4, or they are image-relevant points.
  • the positioning of the detector 5 takes place via a computing / regulating device 6 based on input data that are supplied by the input / output device 7.
  • the computing / control device 6 positions the detector 5 at the selected measuring points 4a, 4b of the printed product created in the printing press 1.
  • the measuring points 4a, 4b are selected either manually by the operating personnel or automatically, taking into account predetermined data.
  • the measuring / regulating device 6 usually selects the measuring points 4a, 4b per color zone in such a way that their color locations in the color space lie near the achromatic axis, since color fluctuations are usually perceived as particularly disturbing.
  • the actual color location E actual of the respective measuring field 4a, 4b is determined in the computing / control device 6 and compared with a predetermined target value E target .
  • a predetermined target value E target is determined in the computing / control device 6 and compared with a predetermined target value E target .
  • both the target color location is shifted and the predetermined tolerance E Toll is newly defined.
  • the influencing of the coloring in the measuring fields 4a, 4b of the printed product 2 takes place via corresponding changes in layer thickness in the individual printing units, ie the ink guide elements 9 of the printing press 1 are adjusted so that a measured actual color location with a predetermined target color location of the corresponding measuring point 4a , 4b matches.
  • a corresponding method is adequately described in EP 03 24 718 A1.
  • the calculation of the desired positions of the ink guide elements 9 of the printing press 1 is carried out in the ink control unit 8.
  • the respective actual position of the ink guide elements 9 in the printing units of the printing press 1 is sent to the ink control unit 8 via potentiometer feedback.
  • the device according to the invention or the method according to the invention can be used “in-line” or “off-line”.
  • the basic structure of a device with which an "in-line" measurement, i. H. A direct acquisition of measured values in selected measuring points 4a, 4b of the printed product 2 in the printing press 1 can be described for example in DE 24 16 009 A1.
  • the method according to the invention is designed such that a color change within the color tolerance E Tol around the target color location E target is excluded.
  • a color locus here the target color locus E target , is described in the color space by the coordinates C0, h0 and L0.
  • C0 clearly indicates the chroma of the target color locus E target and h0 the hue angle of the target color locus.
  • the brightness L0 of the target color locus plays no role in the case of the method according to the invention.
  • the so-called permissible range around the target color locus E Soll lies within the angular range h0 ⁇ ⁇ , ie if an actual color locus E Ist lies within this permissible range, the eye does not perceive any disturbing color change.
  • the angle ⁇ which represents the maximum permissible change in the hue angle h, is 45 °. Only within this angular range are printing results acceptable to the human eye.
  • FIG. 3 shows advantageous embodiments of the method according to the invention.
  • the position of the respective target color locations E target is shown with the coordinates C0, h0, L0 in the down and uv planes of the corresponding color space.
  • Quadrant I of the down or uv plane was chosen as the permissible angular range.
  • the permissible range characterizes the angular range around the target color locus E target , in which no color change disturbing the human color sensation occurs.
  • a color change that has a negative impact can occur as soon as the chromaticity of the target color locus E Soll2 becomes smaller than the maximum permissible chromaticity C max .
  • C02 ⁇ C min that is, in summary, the chroma C02 of the target color locus fulfills the condition: C. min ⁇ C02 ⁇ C Max .
  • the method according to the invention provides the following: In the circular section of the color tolerance E Tol remaining within the permissible range 2 * h0, a tolerance circle is placed which does not leave the permissible range at any point. The center of this tolerance circle becomes the replacement target color location with C02 '.
  • the new replacement target color location with C02 ' has the coordinates ((E Tol + C0) / (1 + sin ⁇ ), h0, L0) .
  • C min indicates the minimum color tolerance.
  • C min is in the range of the measuring accuracy of the detector or the input accuracy of the manipulated variables for the ink guide elements 9 of the printing machine 1. If, as in the previous case, only a color tolerance E Tol 'were allowed which is within the permissible range, then a Regulation take place, although the control accuracy does not allow this.
  • a color tolerance E Tol around the target color location with the chroma C03 in the striated area would clearly lead to color changes in the printed image.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Spectrometry And Color Measurement (AREA)
EP93118739A 1992-11-28 1993-11-22 Méthode pour zonalement commander/régler l'encrage dans une machine d'impression Expired - Lifetime EP0600335B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4240077 1992-11-28
DE4240077A DE4240077C2 (de) 1992-11-28 1992-11-28 Verfahren zur zonalen Steuerung/Regelung der Farbführung in einer Druckmaschine

Publications (2)

Publication Number Publication Date
EP0600335A1 true EP0600335A1 (fr) 1994-06-08
EP0600335B1 EP0600335B1 (fr) 1996-10-16

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EP93118739A Expired - Lifetime EP0600335B1 (fr) 1992-11-28 1993-11-22 Méthode pour zonalement commander/régler l'encrage dans une machine d'impression

Country Status (3)

Country Link
US (1) US5460090A (fr)
EP (1) EP0600335B1 (fr)
DE (2) DE4240077C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289018A (en) * 1994-05-03 1995-11-08 Heidelberger Druckmasch Ag Determination of tolerances in the control of inking on a printing press
EP1279501A2 (fr) * 2001-07-26 2003-01-29 Dainippon Screen Mfg. Co., Ltd. Commande d'alimentation en encre et d'eau dans une machine d'impression, système d'impression avec un tel commande, et programme correspondant

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5774225A (en) 1996-03-27 1998-06-30 Advanced Vision Technology, Ltd. System and method for color measurement and control on-press during printing
ATE177684T1 (de) * 1996-04-19 1999-04-15 Schablonentechnik Kufstein Ag Halbton-druckverfahren und druckmaschine zu seiner durchführung
DE19632969C2 (de) 1996-08-16 1999-04-29 Roland Man Druckmasch Verfahren zur Ermittlung von Vorgabewerten für die Herstellung von mehrfarbigen Druckexemplaren auf einer Druckmaschine
DE19838662C2 (de) 1998-08-25 2001-05-23 Nokia Mobile Phones Ltd Kommunikationsgerät mit Notfallbatterie sowie Verfahren zum Einrichten desselben
US5967050A (en) * 1998-10-02 1999-10-19 Quad/Tech, Inc. Markless color control in a printing press
DE29916379U1 (de) * 1999-09-17 1999-12-09 MAN Roland Druckmaschinen AG, 63075 Offenbach Vorrichtung zum densitometrischen Ausmessen von Druckprodukten
US7017492B2 (en) * 2003-03-10 2006-03-28 Quad/Tech, Inc. Coordinating the functioning of a color control system and a defect detection system for a printing press
US20060170996A1 (en) * 2005-02-02 2006-08-03 Steven Headley Color control of a web printing press utilizing intra-image color measurements
US8127676B2 (en) * 2006-10-13 2012-03-06 Heidelberger Druckmaschinen Ag Print control strip and method of preparing the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228347A1 (fr) * 1985-12-10 1987-07-08 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de commande de l'alimentation en encre pour une machine à imprimer, dispositif d'impression équipé de manière correspondante et dispositif de mesure pour un tel appareil d'impression
EP0324718A1 (fr) * 1988-01-14 1989-07-19 GRETAG Aktiengesellschaft Procédé et dispositif pour régler l'encre dans une machine à imprimer
EP0337148A2 (fr) * 1988-04-12 1989-10-18 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de commande de l'encrage d'une machine d'impression
EP0394681A2 (fr) * 1989-04-24 1990-10-31 Heidelberger Druckmaschinen Aktiengesellschaft Procédé pour contrôler l'encrage dans une machine d'impression avec limitation de l'épaisseur de la couche d'encre et de l'augmentation de la valeur tonale

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2416009A1 (de) * 1974-04-02 1975-10-16 Windmoeller & Hoelscher Vorrichtung zum beobachten des druckbildes bei rotationsdruckmaschinen
DE3543444A1 (de) * 1985-03-21 1986-10-30 Felix Corippo Brunner Verfahren und regelvorrichtung zur erzielung eines gleichfoermigen druckresultats an einer autotypisch arbeitenden mehrfarbendruckmaschine
US5182721A (en) * 1985-12-10 1993-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Process and apparatus for controlling the inking process in a printing machine
DE3626423A1 (de) * 1986-08-05 1988-02-11 Deutsche Forsch Druck Reprod Verfahren und vorrichtung zur beeinflussung der farblichen erscheinung einer farbflaeche bei einem druckvorgang
DE3714179A1 (de) * 1987-04-29 1988-11-17 Forschungsgesellschaft Fuer Dr Verfahren zur steuerung der farbgebung im mehrfarbendruck

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228347A1 (fr) * 1985-12-10 1987-07-08 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de commande de l'alimentation en encre pour une machine à imprimer, dispositif d'impression équipé de manière correspondante et dispositif de mesure pour un tel appareil d'impression
EP0324718A1 (fr) * 1988-01-14 1989-07-19 GRETAG Aktiengesellschaft Procédé et dispositif pour régler l'encre dans une machine à imprimer
EP0337148A2 (fr) * 1988-04-12 1989-10-18 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de commande de l'encrage d'une machine d'impression
EP0394681A2 (fr) * 1989-04-24 1990-10-31 Heidelberger Druckmaschinen Aktiengesellschaft Procédé pour contrôler l'encrage dans une machine d'impression avec limitation de l'épaisseur de la couche d'encre et de l'augmentation de la valeur tonale

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
K. SCHLÄPFER: "Die Definition von Farben und Farbräumen in der digitalen Bildverarbeitung der Druckvorstufe", DEUTSCHER DRUCKER, vol. 27, no. 13, 11 April 1991 (1991-04-11), OSTFILDERN DE, pages W55 - W59, XP000201570 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289018A (en) * 1994-05-03 1995-11-08 Heidelberger Druckmasch Ag Determination of tolerances in the control of inking on a printing press
GB2289018B (en) * 1994-05-03 1997-09-10 Heidelberger Druckmasch Ag Process for determining the permissible tolerances for the control of the inking on a printing press
EP1279501A2 (fr) * 2001-07-26 2003-01-29 Dainippon Screen Mfg. Co., Ltd. Commande d'alimentation en encre et d'eau dans une machine d'impression, système d'impression avec un tel commande, et programme correspondant
EP1279501A3 (fr) * 2001-07-26 2006-11-29 Dainippon Screen Mfg. Co., Ltd. Commande d'alimentation en encre et d'eau dans une machine d'impression, système d'impression avec un tel commande, et programme correspondant

Also Published As

Publication number Publication date
DE4240077A1 (de) 1994-06-01
DE59304189D1 (de) 1996-11-21
DE4240077C2 (de) 1997-01-16
US5460090A (en) 1995-10-24
EP0600335B1 (fr) 1996-10-16

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