EP0741031A2 - Procédé et dispositif de mesure des propriétés dynamiques des zones d'encrage dans un système d'encrage d'une machine à imprimer - Google Patents

Procédé et dispositif de mesure des propriétés dynamiques des zones d'encrage dans un système d'encrage d'une machine à imprimer Download PDF

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Publication number
EP0741031A2
EP0741031A2 EP96105192A EP96105192A EP0741031A2 EP 0741031 A2 EP0741031 A2 EP 0741031A2 EP 96105192 A EP96105192 A EP 96105192A EP 96105192 A EP96105192 A EP 96105192A EP 0741031 A2 EP0741031 A2 EP 0741031A2
Authority
EP
European Patent Office
Prior art keywords
printing
dynamic properties
adjustments
inking
units
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
EP96105192A
Other languages
German (de)
English (en)
Other versions
EP0741031A3 (fr
EP0741031B1 (fr
Inventor
Bernd Kistler
Wolfgang Geissler
Werner Dr. Huber
Harald Bucher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0741031A2 publication Critical patent/EP0741031A2/fr
Publication of EP0741031A3 publication Critical patent/EP0741031A3/fr
Application granted granted Critical
Publication of EP0741031B1 publication Critical patent/EP0741031B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply

Definitions

  • the invention relates to a method for determining the dynamic properties of controlled systems in color zones of inking units of a printing press forming control loops.
  • the dynamic properties of the controller must be adapted to the route.
  • Optimal control results mean a minimal settling time for setpoint changes and the fastest possible correction of faults.
  • the controlled system consists of the ink zone of a printing unit of the printing press.
  • the controlled variable is determined by measurement and compared with a reference variable.
  • the controlled variable represents an actual value and the reference variable represents a desired value.
  • the control deviation determined from the comparison of the actual value and the desired value is fed as a manipulated variable to a controlled system via a controller and an actuator.
  • the control loop has a measuring device which detects the actual value and feeds it to a comparison element in order to determine the control deviation in comparison with the setpoint value.
  • the controller actuates an actuator that acts on the controlled system.
  • the controlled system is formed by the ink zone of the inking unit, that is to say the thickness of the gap in the ink zone is set by means of a suitable actuator, so that a corresponding ink layer thickness is obtained on the printed copy.
  • the controlled system is adapted by means of a suitable model and the optimal controller and the corresponding parameters are defined for this.
  • the controllers can have different time behavior. For example, P controllers, PI controllers, PD controllers, PID controllers or I controllers can be used.
  • P controllers, PI controllers, PD controllers, PID controllers or I controllers can be used.
  • step response or transition function In the case of controlled systems with relatively constant behavior, this can be identified according to the above procedure, which is preferably carried out once when the system is installed.
  • the invention is therefore based on the object of specifying a method for determining the dynamic properties of ink zones of inking units of a printing press, in which there is little or no waste and overlapping problems are overcome.
  • the respective controlled system represents an influence on the ink layer thickness of the printed copy.
  • the measured ink layer thickness is linked to the sensitivity matrix as a representative measured value, the result is independent of the result from possible considerations to the transfer functions of individual printing units.
  • the respective measured value for example a voltage value, is measured using a camera that optically monitors the subject. This voltage value is functionally related to the controlled system variables.
  • the functional relationship is formed by the sensitivity matrix M mentioned. Since the sensitivity matrix is known from the color control of the printing press, it is used according to the invention to determine the dynamic properties of individual controlled systems.
  • the measured values determined during the optical measurement are quasi unbundled from possible superimpositions of several adjustments, i.e., simultaneous or approximately simultaneous changes in the zone openings in several inking units and / or a simultaneous or immediately successive change in the zone opening of an inking unit can be broken down, so that the dynamic properties for each ink zone of each inking unit can be clearly determined.
  • the associated controller can then be optimally selected / set with regard to its control parameters.
  • the determination of the dynamic properties of the subject matter of the invention is carried out during the print job, that is, not in an upstream process, and naturally occurring changes in the manipulated variables are used, that is to say, no deliberately brought about in order to obtain the jump responses.
  • the respective step response is determined by optically measuring the reflectance of the associated printing ink on the printed copy.
  • the above-mentioned camera is used, which is preferably provided with four filters (X, Y, Z and IR), so that the colors red, green, blue and infrared information can be scanned by means of these four channels.
  • the camera thus allows measured values to be obtained in relation to a specific color of an inking unit, a specific color zone of this inking unit being addressed depending on the location of the determination on the subject.
  • Dead time is to be understood as the time that elapses between a change in the manipulated variable and the reaction to it in the form of a changing ink layer thickness on the subject.
  • the response time (dead time) is therefore determined by the unwinding length of the inking unit, which means that the inking unit geometry plays a decisive role.
  • the maximum gradient of the transition function that occurs i.e. the greatest change in the assumption of the new state of the ink layer thickness, is a measure of the total response time, that is to say the time that passes until a new stable state is reached.
  • the identification of the controlled system can be determined by means of these two values on the basis of reduced system parameters, one also Estimation of the dead time and the maximum gradient of the transition function can be carried out.
  • the optical measurement is carried out, as already mentioned, in a camera system which determines a measured value for each of the printing inks used for the separate detection.
  • this can be a voltage value that is functionally related to the color layer thickness.
  • FIG. 1 shows a print copy 1 located in a printing machine, not shown, which is optically scanned by means of a camera 2.
  • the camera has four filters, not shown, to determine the colors red, green, blue and infrared information.
  • the camera 2 detects the reflectances of the various printing inks and preferably uses them to form voltage values which are applied as measured values to the known sensitivity matrix M used in color control. In this way, the dynamic properties of the individual ink zones of the inking units can be determined, the dynamic properties being monitored during the ongoing printing process and as a basis for renewed printing Adaptation of the controller can be used by changing the parameters accordingly.
  • step 4 the measured values are determined by means of the camera 2.
  • step 5 the sensitivity matrix M is applied to the measured values, so that, as step 6-, information about the routes is available which allows the dynamic properties to be individually separated to recognize any considerations.
  • FIG. 3 uses a diagram to explain a change in a manipulated variable S at time t1.
  • This change in the manipulated variable leads to a readjustment with regard to the ink layer thickness of the subject, with a dead time T initially beginning from time t1 to time t2, during which no reaction has yet taken place.
  • the system reacts to the change in the manipulated variable, for example with an exponential increase in the thickness of the ink layer, until - at time t3 - a new steady state is reached.
  • the maximum gradient of this transition function which is determined by the angle, can be used together with the dead time T in order to identify the controlled system.
  • the transfer function from adjustments of several printing units or adjustments of a printing unit can thus be assigned to the individual printing units by using the sensitivity matrix M used in the regulation. Furthermore, the identification of the controlled system is determined by the dead time and the maximum gradient of the transition function, it also being possible to estimate the dead time and the gradient.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP96105192A 1995-05-04 1996-04-01 Procédé et dispositif de mesure des propriétés dynamiques des zones d'encrage dans un système d'encrage d'une machine à imprimer Expired - Lifetime EP0741031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19516334A DE19516334A1 (de) 1995-05-04 1995-05-04 Verfahren zur Bestimmung der dynamischen Eigenschaften von Farbzonen von Farbwerken einer Druckmaschine
DE19516334 1995-05-04

Publications (3)

Publication Number Publication Date
EP0741031A2 true EP0741031A2 (fr) 1996-11-06
EP0741031A3 EP0741031A3 (fr) 1997-09-03
EP0741031B1 EP0741031B1 (fr) 2000-06-28

Family

ID=7761040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96105192A Expired - Lifetime EP0741031B1 (fr) 1995-05-04 1996-04-01 Procédé et dispositif de mesure des propriétés dynamiques des zones d'encrage dans un système d'encrage d'une machine à imprimer

Country Status (2)

Country Link
EP (1) EP0741031B1 (fr)
DE (2) DE19516334A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7059245B2 (en) 2002-04-03 2006-06-13 Heidelberger Druckmaschinen Ag Method of controlling printing presses

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701219A1 (de) * 1997-01-16 1998-07-23 Heidelberger Druckmasch Ag Verfahren zur Steuerung der Farbgebung beim Drucken
DE102009001303A1 (de) * 2009-03-03 2010-09-09 Manroland Ag Verfahren zum Betreiben einer Druckmaschine
DE102012002260A1 (de) * 2011-02-24 2012-08-30 Heidelberger Druckmaschinen Aktiengesellschaft Maschinenabhängige Kompensation in Farbwerk und Feuchtwerk

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE58901780D1 (de) * 1988-01-14 1992-08-13 Gretag Ag Verfahren und vorrichtung zur farbregelung einer druckmaschine.
US5224421A (en) * 1992-04-28 1993-07-06 Heidelberg Harris, Inc. Method for color adjustment and control in a printing press

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7059245B2 (en) 2002-04-03 2006-06-13 Heidelberger Druckmaschinen Ag Method of controlling printing presses
DE10312998B4 (de) * 2002-04-03 2015-07-09 Heidelberger Druckmaschinen Ag Lernende Farbführung

Also Published As

Publication number Publication date
DE19516334A1 (de) 1996-11-07
EP0741031A3 (fr) 1997-09-03
DE59605481D1 (de) 2000-08-03
EP0741031B1 (fr) 2000-06-28

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