EP1671789A1 - Procédé de régulation de l'encrage dans une machine d'impression offset - Google Patents

Procédé de régulation de l'encrage dans une machine d'impression offset Download PDF

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Publication number
EP1671789A1
EP1671789A1 EP05027274A EP05027274A EP1671789A1 EP 1671789 A1 EP1671789 A1 EP 1671789A1 EP 05027274 A EP05027274 A EP 05027274A EP 05027274 A EP05027274 A EP 05027274A EP 1671789 A1 EP1671789 A1 EP 1671789A1
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EP
European Patent Office
Prior art keywords
subject
value
measured
data
covered
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
EP05027274A
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German (de)
English (en)
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EP1671789B1 (fr
Inventor
Armin Weichmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland Web Systems GmbH
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MAN Roland Druckmaschinen AG
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Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP1671789A1 publication Critical patent/EP1671789A1/fr
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B41F31/045—Remote control of the duct keys

Definitions

  • the invention relates to a method for controlling the coloring in an offset printing press according to the preamble of claim 1.
  • each printing unit When printing a substrate is successively moved through several printing units of a printing press, wherein in each printing unit usually a printing ink is applied to the substrate.
  • the four scale colors black, magenta, cyan and yellow and, if appropriate, spot colors are generally printed, with a separate printing unit and therefore inking unit being present for each of these printing inks.
  • the inking unit of each printing unit has a Farbdosier driving, wherein the Farbdosier immunity comprises a number of ink zones corresponding number of Farbzonenstellelementen.
  • the Farbzonenstellelemente are also referred to as a color slider or color meter.
  • ink is applied to an ink fountain roller, which is also referred to as a ductor roller.
  • the color quantity applied to the ductor roller depending on the ink zone setting elements per ink zone is transferred from a lifting roller or from a film roller to an inking roller of the inking unit arranged downstream of the Haber roller or film roller.
  • the ink is moved over several inking rollers in the direction of a plate cylinder or plate cylinder of each printing unit.
  • On the forme cylinder of a printing unit rolls at least one inking roller serving as the inking roller of the respective inking unit. Accordingly, the printing ink reaches at least one printing plate positioned on the forme cylinder via the or each inking roller.
  • the forme cylinder acts a so-called transfer cylinder or blanket cylinder, which transfers the ink from the forme cylinder to the substrate.
  • the color design of a printed product to be printed is set in a so-called pre-press.
  • so-called area coverage values are defined for each ink zone to be printed and thus for all inking units of the printing machine involved in the printing for each color zone.
  • the ink zone setting elements are adjusted and thus the zonal coloration is determined.
  • measuring ranges printed on the printing material so-called pressure control elements
  • pressure control elements are usually measured outside of a subject, wherein actual values of the zonal coloring determined in this case are transmitted to a regulating device of the printing press.
  • the actual values are compared with predetermined setpoint values in order to generate actuating signals for the ink zone setting elements as a function of the comparison between the actual values and the setpoint values and thus dependent on the control deviation between the measured actual values and the predefined setpoint values.
  • an automatic control of the zonal coloring is possible. It is also possible to measure areas within a subject as measuring ranges and to regulate the zonal coloring as a function thereof. It is also possible to measure print control elements and regions within the subject printed as measuring ranges outside a subject.
  • the present invention is based on the problem to provide a novel method for controlling the color in an offset printing machine.
  • control deviations between the measured actual values and the predetermined nominal values are modified on the basis of a model of the respective inking unit and / or on the basis of data of the subject.
  • the control deviations between the actual values determined by measurement of measuring ranges and the predetermined desired values on the basis of data of the subject and / or on the basis of a model of the respective inking unit.
  • the invention is based on the idea that a deviation between the actual values of the subject and the predefined setpoint values, although the actual values of the measuring ranges coincide with the predetermined setpoint values, on the expression of the subject to be printed and / or on the rolling behavior and optionally on the traversing behavior of the inking unit can depend.
  • the control deviations between the actual values measured at the measuring ranges and the predetermined desired values are accordingly modified in order to achieve a correspondence between desired values and actual values in the subject.
  • At least one measuring area is measured per color zone of the subject, wherein a circumferential strip covered by the measuring area is smaller than a circumferential strip covered by the respective color zone, and if, in the circumferential strip covered by the measuring area, one from the data of the Subjects certain area coverage value is less than a predetermined limit, the default value for the corresponding Increases inking zone actuator or the measured actual value is reduced.
  • a coverage area value dependent on the stenciling behavior of the respective inking unit is determined from the data of the subject and the model of the respective inking unit for the circumferential strip covered by the measuring area, wherein, if this areal coverage value is greater than a predefined limit value, the predetermined one Setpoint for the corresponding Farbzonenstellelement reduced or the measured actual value is increased.
  • a drop in color is determined depending on the model of the respective inking, wherein when in the covered by the measuring range perimeter strip is a maximum of the color drop, increases the predetermined target value for the corresponding Farbzonenstellelement or the measured actual value is reduced, and wherein, when there is a minimum of the color drop in the circumferential strip covered by the measuring area, the predetermined target value for the corresponding inking zone actuating element is reduced or the measured actual value is increased.
  • FIGS. 1 and 2 show an inking unit 10 of an offset printing machine designed as a lifting inking unit, wherein the inking unit 10 comprises a fountain roller 11 which receives printing ink held ready in an ink fountain 12. With the ductor roller 11, a lifting roller 13 cooperates, wherein the lifting roller 13 receives from the ink fountain roller 11 printing ink in the form of a so-called lift strip and intermittently in the direction of arrow 14 to one of the lifting roller 13 downstream inking roller 15 transfers.
  • the inking unit roller 15 are further inking rollers 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 and 26 downstream, wherein the inking rollers 16 to 26 transport the ink in the direction of a forme cylinder 27.
  • the inking rollers 23, 24, 25 and 26 roll on the forme cylinder 27 and are therefore also referred to as inking rollers. At least one printing plate is positioned on the forme cylinder, with the inking rollers 23 to 26 applying the printing ink to the printing plate.
  • the amount of ink that is transferred from the ink fountain 12 to the ink fountain roller 11 depends on a zonal coloring of a subject to be printed.
  • the ink fountain 12 so-called Farbzonenstellelemente 28 are assigned, wherein on the Farbzonenstellelemente 28 which per color zone on the ink fountain roller 11 transmitted amount of color is adjustable.
  • the Farbzonenstellelemente are designed as a color slider.
  • the ink slide and the squeegee roller are part of a so-called Farbdosier adopted the inking unit.
  • inking unit 10 shown in FIG. 1 is preferably used in sheet-fed offset printing presses.
  • inking units are used which, instead of color slides, comprise colorimeters as color zone setting elements and, instead of the lifting roller, a so-called film roller.
  • Fig. 3 shows schematically a substrate 29, which is printed with aof 30 and outside of the subject 30 with pressure control elements 31, wherein the pressure control elements 31 are printed outside the actual subject 30 in the form of a control strip 32 on the substrate 29.
  • the printed on the substrate 29 Sujet 30 is divided into a total of twelve ink zones 33; wherein the per ink zone 33 applied to the substrate 29 ink by a corresponding number of Farbzonenstellelementen 28 is adjustable.
  • a print control element 31 is printed on the printing substrate 29 outside the subject 30 per ink zone 33, whereby a peripheral strip 34 covered by the print control element 31 is smaller or narrower than the peripheral strip covered by the respective ink zone 33.
  • the pressure control elements 31 printed outside of the subject 30 are measured densitometrically and / or colorimetrically and / or spectrally and actual values determined here are compared with predetermined setpoint values in a control device in order to depend on the comparison between the actual values obtained by measuring the pressure control elements 31 and the predetermined setpoint values To generate control signals for the Farbzonenstellelemente 28 for automatically controlling the zonal coloring of the subject 30.
  • control deviations are modified both on the basis of data of the subject and on the basis of a model of the respective inking unit.
  • digital pre-press data is used, either as low-resolution PPF or JDF format data or as high-resolution image data.
  • the high-resolution image data are preferably so-called bitmaps of the individual color separations, which are usually used for the production of printing forms.
  • the model of the inking unit which is used to modify deviations, depends on the rolling behavior and, if necessary, traversing behavior of the rollers of the inking unit.
  • the model of the inking unit can also incorporate data about the materials used in the inking unit as well as the dynamic behavior of the inking unit.
  • At least one print control element 31, which is printed on the printing substrate 29 outside the subject 30, is measured, wherein a peripheral strip 34 covered by the print control element 31 is smaller or narrower than one covered by the respective color zone 33 Is circumferential strip.
  • a coverage value is determined from the data of the subject, which are preferably provided from a digital pre-press, for the coverage area covered by the print control element 31, a coverage value. If this areal coverage value determined from the data of the subject is smaller than a predefined limit value, then in accordance with the present invention the predetermined setpoint value for the corresponding color zone setting element is increased or the measured actual value is reduced.
  • the target value for the corresponding inking zone actuator is increased by an amount X, which is from the data
  • the area coverage value determined for the subject varies between 0.5% and 2%, so the setpoint can be increased by an amount Y, the amount Y being smaller than the amount X. If, however, the area coverage value determined for the circumferential strip covered by the print control element is greater than 2%, no increase in the reference value takes place.
  • the peripheral strip covered by the pressure control element can be subdivided into a plurality of sub-strips, wherein an area coverage value is determined for each of the sub-strips from the data of the subject. It is then possible to use an averaging of the area coverage values of these sub-strips to modify the control deviation between the setpoint and the actual value. Alternatively, only the areal coverage value of that sub-stripe can be used to adapt the setpoint value and / or the actual value and thus to modify the control deviation between the setpoint value and the actual value within which a measurement area of the pressure control element lies.
  • a traversing behavior of at least one roller of the inking unit is known from the inking unit model of the inking unit, according to a further advantageous development of the invention not only is the area coverage covered by the printing control member determined from the180 data, but such areal coverage values are also determined for adjacent circumferential bands , Preferably, for a plurality of adjacent circumferential stripes, corresponding areal coverage values are determined from the data of the subject, wherein in the change of the desired value and / or the actual value of the circumferential strip covered by the control element, more distant circumferential stripes are weighted less heavily than closer circumferential stripes.
  • a so-called drop in color is determined depending on the model of the respective inking unit.
  • a drop in color usually sets in when the rolling on the forme cylinder Ink rollers can not apply printing ink on the printing form due to a clamping channel for a printing plate. If it is determined from the inking unit model that a pressure control element is affected by such a drop in color, a modification of the control deviation between the measured setpoint and the preset actual value also takes place.
  • the predetermined target value for the corresponding ink zone actuating element is increased or the measured actual value is reduced. If, on the other hand, there is a minimum of the ink drop in the peripheral strip covered by the pressure control element, then the predetermined desired value for the corresponding ink fountain element is reduced or the measured actual value is increased.
  • a surface coverage value dependent on the stenciling behavior of the inking unit is determined from the data of the subject and from the model of the inking unit for a circumferential strip covered by the print control element. If this area-coverage value, which depends on the stenciling behavior, is greater than a predefined limit value, the preset nominal value for the corresponding ink-zone actuating element is reduced in the sense of the present invention or the measured actual value is increased.
  • the procedure is as follows, that for the circumference strip covered by the pressure control element a surface coverage value is determined, which is a development length of a application roller in front of the peripheral strip covered by the pressure control element.
  • a respective unwinding length of these rollers is determined before the circumference strip covered by the pressure control element, a corresponding areal coverage value. If the area coverage determined in this case is greater than a predefined limit value, preferably the predefined setpoint value for the corresponding ink zone setting element is reduced.
  • the effect can be taken into account that when the covered by the pressure control element perimeter strip a circumferential length of a inking roller from a perimeter strip with high area coverage is removed, the pressure control element displays a lower color density, since such a strong decrease in color after a rollover of the inking roller not yet complete can be compensated.
  • a method for controlling the color scheme in which system deviations between actual values and predetermined setpoint values acquired at print control elements printed outside the actual subject are modified depending on data of the subject as well as on an inking unit model.
  • effects such as the inking unit, the drop in color and the fact that a covered by a pressure control element perimeter strip is smaller than a covered by the respective color zone perimeter strip, bill be taken into account.
  • the color can be optimized significantly during printing.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP05027274A 2004-12-18 2005-12-14 Procédé de régulation de l'encrage dans une machine d'impression offset Not-in-force EP1671789B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004061469A DE102004061469A1 (de) 2004-12-18 2004-12-18 Verfahren zur Regelung der Farbgebung in einer Offsettdruckmaschine

Publications (2)

Publication Number Publication Date
EP1671789A1 true EP1671789A1 (fr) 2006-06-21
EP1671789B1 EP1671789B1 (fr) 2008-07-16

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EP05027274A Not-in-force EP1671789B1 (fr) 2004-12-18 2005-12-14 Procédé de régulation de l'encrage dans une machine d'impression offset

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US (1) US7481165B2 (fr)
EP (1) EP1671789B1 (fr)
CA (1) CA2530997A1 (fr)
DE (2) DE102004061469A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2674299A1 (fr) * 2012-06-12 2013-12-18 Goss International Americas, Inc. Système et procédé de commande d'encre en boucle fermée pour presse à imprimer
DE102013100916A1 (de) 2013-01-30 2014-07-31 Manroland Web Systems Gmbh Verfahren zur Regelung eines Parameters eines Farbwerks

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007005018B4 (de) * 2006-02-24 2020-06-04 Heidelberger Druckmaschinen Ag Verfahren zur Farbregelung von Vervielfältigungsexemplaren einer Druckmaschine
US8612280B2 (en) * 2006-11-07 2013-12-17 Xerox Corporation Selection of performance indicators for workflow monitoring
DE102008038608A1 (de) * 2008-08-21 2010-02-25 Heidelberger Druckmaschinen Ag Verfahren und Einrichtung zum Drucken von unterschiedlichen Nutzen auf einem Druckbogen
DE102013109920A1 (de) * 2013-09-10 2015-03-12 Manroland Web Systems Gmbh Verfahren zum Bedrucken eines Bedruckstoffs

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US5029527A (en) * 1982-05-29 1991-07-09 Heidelberger Druckmaschinen Ag Assembly for influencing inking in printing machines
DE19515499A1 (de) * 1995-04-27 1996-10-31 Heidelberger Druckmasch Ag Verfahren zum Regeln der Farbgebung beim Drucken
EP1080891A1 (fr) * 1999-09-06 2001-03-07 Komori Corporation Procédé et dispositif pour ajuster la quantité de l'alimentation en encre pour une machine à imprimer
EP1302325A2 (fr) * 2001-10-10 2003-04-16 Dainippon Screen Mfg. Co., Ltd. Appareil d'impression
EP1433605A1 (fr) * 2002-12-26 2004-06-30 Dainippon Screen Mfg. Co., Ltd. Procédé et appareil pour le contrôle de débit d'alimentation en encre

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5029527A (en) * 1982-05-29 1991-07-09 Heidelberger Druckmaschinen Ag Assembly for influencing inking in printing machines
DE19515499A1 (de) * 1995-04-27 1996-10-31 Heidelberger Druckmasch Ag Verfahren zum Regeln der Farbgebung beim Drucken
EP1080891A1 (fr) * 1999-09-06 2001-03-07 Komori Corporation Procédé et dispositif pour ajuster la quantité de l'alimentation en encre pour une machine à imprimer
EP1302325A2 (fr) * 2001-10-10 2003-04-16 Dainippon Screen Mfg. Co., Ltd. Appareil d'impression
EP1433605A1 (fr) * 2002-12-26 2004-06-30 Dainippon Screen Mfg. Co., Ltd. Procédé et appareil pour le contrôle de débit d'alimentation en encre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2674299A1 (fr) * 2012-06-12 2013-12-18 Goss International Americas, Inc. Système et procédé de commande d'encre en boucle fermée pour presse à imprimer
DE102013100916A1 (de) 2013-01-30 2014-07-31 Manroland Web Systems Gmbh Verfahren zur Regelung eines Parameters eines Farbwerks
EP2762316A2 (fr) 2013-01-30 2014-08-06 manroland web systems GmbH Procédé de régulation d'un paramètre d'un dispositif d'encrage

Also Published As

Publication number Publication date
DE102004061469A1 (de) 2006-07-13
DE502005004717D1 (de) 2008-08-28
US7481165B2 (en) 2009-01-27
CA2530997A1 (fr) 2006-06-18
EP1671789B1 (fr) 2008-07-16
US20060130687A1 (en) 2006-06-22

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