EP0741031B1 - 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
EP0741031B1
EP0741031B1 EP96105192A EP96105192A EP0741031B1 EP 0741031 B1 EP0741031 B1 EP 0741031B1 EP 96105192 A EP96105192 A EP 96105192A EP 96105192 A EP96105192 A EP 96105192A EP 0741031 B1 EP0741031 B1 EP 0741031B1
Authority
EP
European Patent Office
Prior art keywords
printing
ink
dynamic properties
superimposed
adjustments
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.)
Expired - Lifetime
Application number
EP96105192A
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German (de)
English (en)
Other versions
EP0741031A2 (fr
EP0741031A3 (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
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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 control loops forming ink zones of inking units of a printing press.
  • the controlled system consists of the Color zone of a printing unit of the printing press.
  • the controlled variable is determined by measurement and with a reference variable compared.
  • the controlled variable represents an actual value and the Reference variable represents a setpoint.
  • the comparison of The actual value and setpoint determined control deviation is over a controller and an actuator as a manipulated variable Controlled system fed.
  • the control loop has one Measuring device that detects the actual value and a Comparator feeds the - in comparison with the setpoint To determine control deviation.
  • the determined control deviation becomes an actuator from the controller actuated, which acts on the controlled system.
  • the present Trap becomes the controlled system from the ink zone of the inking unit formed, that is, the thickness of the gap of the color zone adjusted by means of a suitable actuator so that a corresponding one on the printed copy Sets the ink layer thickness.
  • the controller For the necessary adaptation of the controller to the dynamic Characteristics of the controlled system it is required that Set control parameters.
  • the controllers can have different timing. So are for example P controller, PI controller, PD controller, PID controller or I controller can be used.
  • To identify the Controlled system becomes the response to a volatile Changes in the manipulated variable are analyzed. Then there is one so-called step response or transition function in front. For controlled systems with relatively constant behavior these are identified according to the above procedure, which is preferably unique when installing the system is carried out.
  • the invention is therefore based on the object of a method for determining the dynamic properties of color zones of inking units of a printing press in which none or hardly any waste and overlay problems be overcome.
  • the respective controlled system represents in terms of their adjustable zone opening an influence on the Ink layer thickness of the printed copy. If the measured Ink layer thickness as a representative measured value with the Sensitivity matrix linked, so you get independent from possible considerations to the transfer functions individual printing units.
  • the respective measured value for example a voltage value is measured by means of a camera which the subject is visually monitored. This voltage value is in functional connection with the controlled system sizes. The functional connection is mentioned by the Sensitivity matrix M formed. Because the sensitivity matrix is known from the color control of the printing press (see e.g. EP-A 0 324 718) -according to the invention- used to the dynamic To determine the properties of individual controlled systems.
  • the determination of the dynamic properties in the subject of the invention performed during the print job, not in one upstream process, and it will naturally occur Based on manipulated variable changes, so not consciously brought about to get the jump responses. This leads to no waste and that dynamic properties throughout Processing time of a print job repeatedly determined can be, so that possibly adjusting Changes to these properties - if desired - will respond can be.
  • the respective step response by optically measuring the Remission of the associated printing ink on the printed copy is determined.
  • the one already mentioned above Camera used preferably with four filters (X, Y, Z and IR) is provided, so that by means of these four channels Colors red, green, blue and infrared information can be scanned.
  • the camera thus allows measured values in relation to a specific color of an inking unit received, depending on the location of the investigation on the subject a certain color zone of this inking unit is addressed.
  • the maximum gradient occurring Transitional function i.e. the greatest change in acceptance the new state of the ink layer thickness is a measure of the total response time, i.e. the time until it is reached of a new stable state passes.
  • the identification of the The controlled system can be based on these two values Determine reduced route parameters, including a Estimation of the dead time and the maximum gradient of the Transition function can be performed.
  • the optical measurement is old a camera system - as already mentioned - is carried out, that for separating recognition to each of the used Printing inks determined a measured value. It can be - as already mentioned - by a voltage value act functionally with the color layer thickness in Is related.
  • FIG. 1 shows one that is not shown Printing press 1 located, the optical is scanned by a camera 2.
  • the camera has four Filters, not shown, to the colors red, green, blue and determine infrared information.
  • the camera 2 detects the remissions of the different ones Printing inks and preferably forms tension values therefrom, the as measured values with the known, in the color control used sensitivity matrix M are applied. This allows the dynamic properties of the determine individual color zones of the inking units, the dynamic properties while running Printing process monitored and as a basis for renewed Adaptation of the controller by changing the Parameters can be used.
  • step 4 the Determination of the measured values using the camera 2.
  • step 5 the measured values with the sensitivity matrix M acted on so that -as step 6- information about the Routes are available that allow the dynamic properties individually with unbundling to recognize any considerations.
  • FIG. 3 explains a change using a diagram a manipulated variable S at time t1.
  • This The manipulated variable changes with regard to the ink layer thickness of the subject to a new setting, starting initially from time t1 to time t2- a dead time T is present during which there is still no reaction.
  • the system reacts to the change in the manipulated variable for example with an exponential increase in Ink layer thickness, until - at time t3 - a new one steady state is reached.
  • the maximum gradient this transition function which is determined by the angle ⁇ can be used together with the dead time T, to identify the controlled system.
  • the Transfer function from adjustments of several printing units or adjustments of a printing unit by using the of the regulation used sensitivity matrix M on the assign to individual printing units Furthermore, the identification the controlled system through the dead time and the maximum Gradients of the transition function are determined, with a Dead time and gradient can be estimated.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (4)

  1. Procédé pour déterminer les propriétés dynamiques de systèmes asservis dans des zones d'encrage de mécanismes d'encrage d'une machine à imprimer qui forment des boucles d'asservissement,
       caractérisé
       en ce que les réponses discontinues qui se produisent pendant l'impression pour l'exécution d'une commande d'impression sur la base de modifications de la variable réglante - même si des réglages, et donc des réponses discontinues, se superposent dans différents groupes imprimants et/ou s'il se produit des réglages exécutés suffisamment tôt l'un après l'autre et qui sont ainsi superposés, et donc des réponses discontinues superposées d'un groupe imprimant - sont chargées avec une matrice connue de sensibilité (M) pour combattre les superpositions en vue de la reconnaissance du comportement dynamique individuel de chaque mécanisme d'encrage ou du mécanisme d'encrage.
  2. Procédé selon la revendication 1
       caractérisé
       en ce que la réponse discontinue est obtenue par mesure optique de la luminance de réflexion de l'encre d'impression correspondante sur l'exemplaire imprimé.
  3. Procédé selon une des revendications précédentes,
       caractérisé
       en ce qu'on utilise exclusivement le temps mort (T) de la réponse discontinue situé entre le début de la modification de la variable réglante et le début de la modification de l'épaisseur de la couche d'encre, ainsi que le gradient maximal de la fonction de transition (Ü).
  4. Procédé selon une des revendications précédentes,
       caractérisé
       en ce que la mesure optique est exécutée avec un système de caméra (2) qui prend une valeur de mesure en vue de l'identification séparée de chacune des encres d'impression utilisées.
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
DE19516334 1995-05-04
DE19516334A DE19516334A1 (de) 1995-05-04 1995-05-04 Verfahren zur Bestimmung der dynamischen Eigenschaften von Farbzonen von Farbwerken einer Druckmaschine

Publications (3)

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

Families Citing this family (4)

* 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
DE10312998B4 (de) * 2002-04-03 2015-07-09 Heidelberger Druckmaschinen Ag Lernende Farbführung
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
EP0324718B1 (fr) * 1988-01-14 1992-07-08 GRETAG Aktiengesellschaft Procédé et dispositif pour régler l'encre dans une machine à imprimer
US5224421A (en) * 1992-04-28 1993-07-06 Heidelberg Harris, Inc. Method for color adjustment and control in a printing press

Also Published As

Publication number Publication date
DE19516334A1 (de) 1996-11-07
EP0741031A2 (fr) 1996-11-06
DE59605481D1 (de) 2000-08-03
EP0741031A3 (fr) 1997-09-03

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