EP1216833B1 - Méthode de régulation de l'équilibre encre-solution de mouillage dans une machine d'impression rotative - Google Patents

Méthode de régulation de l'équilibre encre-solution de mouillage dans une machine d'impression rotative Download PDF

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Publication number
EP1216833B1
EP1216833B1 EP01126423A EP01126423A EP1216833B1 EP 1216833 B1 EP1216833 B1 EP 1216833B1 EP 01126423 A EP01126423 A EP 01126423A EP 01126423 A EP01126423 A EP 01126423A EP 1216833 B1 EP1216833 B1 EP 1216833B1
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EP
European Patent Office
Prior art keywords
value
determined
moisturising
ink
sensor
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
EP01126423A
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German (de)
English (en)
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EP1216833A1 (fr
Inventor
Philippe Berton
Alain Blanchard
Dominique Boillot
Antoine Chevalier
Patrick Lepeltier
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Goss International Montataire SA
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Goss International Montataire SA
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Publication of EP1216833A1 publication Critical patent/EP1216833A1/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
    • B41F33/0054—Devices for controlling dampening
    • 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
    • B41P2233/10—Starting-up the machine
    • B41P2233/11—Pre-inking
    • 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
    • B41P2233/10—Starting-up the machine
    • B41P2233/12—Pre-wetting

Definitions

  • the invention relates to a method for controlling the ink-to-dampening solution equilibrium in a rotary offset printing machine, wherein the amount of dampening solution is determined in particular by means of the signals of a sensor which determines the light reflectivity of a moistened wetted area on a printing form of the rotary printing press.
  • the inventive method for controlling the color-to-dampening solution balance in a rotary offset printing machine which is preferably realized by a corresponding control and regulation software in a known Druckmaschinen Kunststoffungs- and -regels worn, which is supplied to a printing plate or printing form dampening solution using the signals of a sensor which preferably has the light reflectivity of a Wetting agent wetted, preferably non-printing area, determined on the printing plate.
  • the senor can, for example, detect the reflected light of a laser which is directed in the normal direction or at an angle to the non-printing area of the printing form, and generate a sensor signal which is a measure of the light as a function of the detected light intensity Reflectivity of the printing plate, which in turn depends on the amount of fountain solution in the area.
  • the printing for the respective print job to be supplied dampening solution is preset, which can be done for example in a known manner by entanglement or a variation of the contact pressure between dampening agent rollers in the dampening unit of the printing press, or in any other known manner.
  • the default of the printing forme supplied dampening solution amount and / or the printing form supplied ink quantity in the default setting is preferably carried out at standstill of the printing press, or in creep operation thereof, whereby the waste of waste is reduced in an advantageous manner.
  • the presetting of the dampening solution quantity is preferably carried out on the basis of a preset signal value which corresponds to the signal value of the sensor for the dampening solution target value which was determined by the sensor during a preceding print job.
  • the dampening solution target quantity of the previous print job, or the signal value of the sensor assigned to it, which essentially corresponds to the optimum amount of dampening solution for the preceding job, can be stored in a memory, for example. This results in the advantage that a pre-adjustment of the dampening solution can be brought about in a simple manner by increasing the dampening solution amount until the signal value measured by the sensor corresponds to the stored signal value.
  • the amount of dampening solution based on a calculated preset signal value, preferably from the signal values of the sensor for the dampening solution target values during two or three several previous print jobs is determined by averaging. It is assumed here that the fountain solution target values of the preceding print jobs essentially correspond to the optimum fountain solution quantity for the set color quantity which has led to an optimum color dampening emulsion in the preceding print jobs. Averaging reduces the influence of signal values of the sensor, which were measured at a non-optimal setting of the color to dampening solution balance in the previous print jobs and stored to form the average value.
  • the preset signal value is multiplied by a factor preferably preselectable by the machine operator, or a preferably preselectable value is added thereto.
  • the amount of dampening solution is shut down, for example, by reducing the speed of the scoop roller or reducing the Verschränkungswinkels between the scoop roller and its associated dampening dosing roller, or in another known manner with the printing presses until the signal of The sensor passes a minimum in the area of the lubrication limit and rises again to calibrate the amount of dampening solution.
  • the signal of the sensor in the minimum which can be determined even more accurately by further known mathematical methods, is preferably stored in a memory of an associated control device.
  • the dampening solution quantity is increased again starting from the stored value until the signal from the sensor has a value which corresponds to one Dampening agent quantity default value corresponds.
  • the dampening solution setpoint may be determined by multiplying the signal value of the sensor at the minimum by a predetermined factor and may, for example, be in the range of 14% above the signal value of the sensor at the minimum.
  • variable value is added, which is preferably determined empirically, or is determined by taking into account the color area coverage of the printing form.
  • the predefined factor or the value added to the dampening solution quantity default value are preferably likewise preselectable by the machine operator. This has the advantage that the optimum dampening solution quantity default value can be easily changed by the printer if the color-to-dampening agent balance deviates from a customary default value, for example by selecting another dampening solution additive or by choosing another printing ink.
  • the predetermined factor or value added to the fountain solution setpoint is preferably determined based on the signal values of the sensor determined at the dampening solution target values for the previous one or more of the preceding print jobs, and preferably stored in a memory of the printing press ,
  • the amount of dampening solution is adjusted in a preferably closed control loop to this dampening solution quantity default value.
  • a suitably designed control circuit may be used, for example a PID controller, which is preferably is also implemented in software in the (central) Druckmaschinen Kunststoffungs- and - control device.
  • the dampening solution default value is increased in a corresponding manner and in the same direction to a dampening target.
  • increasing or decreasing the dampening solution target value takes place substantially simultaneously with increasing or decreasing the amount of ink to the new target color amount, resulting in a very fast regulation, by which the amount of waste accumulated further reduce.
  • the dampening solution quantity target value is increased or decreased only after a preferably predefinable time period after the time at which the ink quantity target value was set by the ink zone control or regulation.
  • the value by which the fountain solution target value is increased or decreased is determined by means of stored or calculated signal values of the sensor associated with a respective increase or decrease of the ink quantity target value.
  • the stored signal values of the sensor are preferably determined on an empirical basis and together with the associated values for an increase or decrease in the Color set target value stored in a memory of the printing press, such as a map, as a parameter or parameterized curves.
  • the ink amount target value is changed in a closed loop, for which the ink coverage or color density on the printing plate or on the substrate according to a known from the prior art method, for example, densitometrically or colorimetrically determined by a corresponding sensor.
  • the amount of dampening solution supplied is controlled in a closed loop depending on the dampening target value in a narrow range around the dampening solution target value such that oscillation of the dampening solution amount measured by the sensor is reduced by the dampening solution target becomes.
  • further parameters such as, for example, the temperature of the dampening solution, the printing plate and / or the speed of the printing press, may be included in the control process by the control device in order to obtain a reliable control of the dampening solution quantity.
  • the dampening solution quantity supplied to the printing form is set to a dampening solution presetting value V 0 when the printing press is stationary.
  • the presetting is carried out - as shown in FIG. 2 - on the basis of a preset signal value S 0 measured by a sensor, which is not shown, to which the supplied dampening solution quantity is preferably increased during standstill or during creeping operation of the printing press.
  • the supplied fountain solution quantity is then increased during the creeping operation of the printing machine until the preset signal value of the sensor has increased by a value ⁇ S to a higher preset signal value S 1 .
  • a calibration of the supplied amount of fountain solution is carried out at essentially constant ink quantity.
  • the amount of dampening solution at a time t 0 (see the lower half of FIG. 2) of the value corresponding to the preset signal value S 1 for the dampening solution amount until the signal S of the sensor a minimum at the Run through V min .
  • the associated value S min of the sensor signal S at the minimum is stored and used as the base value or reference value for the further control and regulation processes of the fountain solution quantity and / or the ink quantity.
  • the dampening solution quantity is subsequently adjusted to a preset dampening agent preset value V default for the respective print job, which can be effected by the dampening solution quantity V continuously returning after passing through the minimum V min is increased until the signal value S of the sensor reaches the default signal value S default .
  • the amount of dampening solution is then controlled by the dampening solution quantity default value V default by means of the signals S of the sensor in such a way - the control preferably takes place in a closed loop - that the dampening solution amount V in the in Fig. 3 hatched drawn area 10 is located, in which an optimum for the printing color-to-dampening emulsion is obtained.
  • the amount of ink is set to a substantially constant color set default value F default , which is determined, for example, as a function of the ink coverage on the printing form for the associated color on the basis of prepress data.
  • the color quantity default value F default is expressed in FIG. 3 in that the sensor signal S is a function of the color specification value F default .
  • a next process step 4 (FIG. 1), the ink quantity is increased from the ink quantity default value F default to a desired ink quantity target value F target + for the print job to be processed or lowered to a lower ink quantity target value F target , which is shown in FIG. 4 by the two waveforms S (F target + ) and S (F target ) lying to the right and left of the waveform S (F default ) is expressed.
  • the supplied dampening solution quantity V is lowered from the dampening solution quantity default value V target to a lower dampening solution target value V target if the amount of ink is lowered in accordance with arrow 14 from the ink quantity default value F default to the lower ink quantity target value F target .
  • the various curves of the family of curves for the signal curve S with an increase or decrease in the amount of ink, of which only three curves are shown by way of example in FIG. 4, are advantageously stored in a characteristic field as parameters in the preferred embodiment of the invention, so that the to the signal values associated fountain solution quantities can be assigned by reading the parameters.
  • the supplied fountain solution quantity V is regulated in a closed control loop as a function of the dampening solution target value V target , V target + , which advantageously depends on the signal values for the respective dampening solution target values V target and V target + within the optimum range for the respective color-to-dampening emulsion 10 (see FIG. 3) takes place, which latter is indicated only schematically in Fig. 4.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)

Claims (19)

  1. Procédé de réglage de l'équilibre encre-agent humidifiant dans une machine à imprimer rotative offset, la quantité d'agent humidifiant étant déterminée notamment à l'aide des signaux émanant d'un capteur qui détermine le pouvoir photo-réfléchissant d'une zone mouillée par un agent humidifiant sur une forme d'impression de la machine à imprimer rotative, comprenant les étapes de procédé suivantes :
    - réglage préliminaire de la quantité d'agent humidifiant fournie à la forme d'impression,
    - étalonnage de la quantité d'agent humidifiant fournie, alors que la quantité d'encre est maintenue sensiblement constante,
    - réglage de la quantité d'agent humidifiant, à une valeur attribuée de quantité d'agent humidifiant caractéristique de l'application d'impression spécifique,
    - caractérisé par une augmentation ou diminution de la quantité d'encre, d'une valeur attribuée de quantité d'encre à une-valeur de consigne de quantité d'encre souhaitée pour l'application d'impression à effectuer, et augmentation ou diminution correspondante de la valeur attribuée de quantité d'agent humidifiant, dans le même sens, afin d'atteindre une valeur de consigne de quantité d'agent humidifiant, et
    - réglage de la quantité d'agent humidifiant fournie, dans un circuit de régulation fermé, en fonction de la valeur de consigne de la quantité d'agent humidifiant.
  2. Procédé selon la revendication 1, caractérisé en ce que l'augmentation ou la diminution de la valeur de consigne de quantité d'agent humidifiant s'effectue pratiquement simultanément à l'augmentation ou à la diminution de la quantité d'encre, effectuée afin d'atteindre la valeur de consigne de quantité d'encre souhaitée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la valeur, de laquelle la valeur attribuée de quantité d'agent humidifiant est augmentée ou diminuée, est déterminée à l'aide de valeur de signaux, émanant du capteur et mémorisées ou calculées, associées à une augmentation ou à une diminution respective de la valeur de consigne de quantité d'encre.
  4. Procédé selon la revendication 3, caractérisé en ce que les valeurs de signaux mémorisées du capteur sont déterminées sur une base empirique et sont placées dans une mémoire de la machine à imprimer, conjointement avec les valeurs afférentes concernant une augmentation ou une diminution de la valeur de consigne de quantité d'encre.
  5. Procédé selon la revendication 1, caractérisé en ce que le pré-réglage de la quantité d'agent humidifiant et/ou de la quantité d'encre fournie(s) à la forme d'impression se fait lorsque la machine à imprimer est à l'arrêt.
  6. Procédé selon la revendication 1, caractérisé en ce que le pré-réglage de la quantité d'agent humidifiant se fait sur la base d'une valeur de signal de pré-réglage, qui correspond à la valeur de signal du capteur pour la valeur de consigne de quantité d'agent humidifiant, pendant l'application d'impression précédente.
  7. Procédé selon la revendication 1, caractérisé en ce que le pré-réglage de la quantité d'agent humidifiant s'effectue sur la base d'une valeur de signal de pré-réglage calculée, déterminée à partir des valeurs de signaux émanant du capteur, pour les valeurs de consigne de quantité d'agent humidifiant, pendant deux applications d'impression précédentes ou plus, par formation d'une valeur moyenne.
  8. Procédé selon la revendication 7, caractérisé en ce que, pour assurer une surhumidification pendant la montée en régime de la machine à imprimer, la valeur de signal de pré-réglage est multipliée par un facteur présélectionnable par l'opérateur machine, ou bien est augmentée d'une valeur présélectionnable par l'opérateur machine.
  9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que la valeur de signal ou les valeurs de signaux du capteur, pour la ou les valeurs de consigne de la quantité d'agent humidifiant, sont déterminées pendant le fonctionnement au ralenti ou pendant le fonctionnement en impression continue de la machine à imprimer.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la quantité d'agent humidifiant fournie pour l'étalonnage est réduite, jusqu'à ce que le signal du capteur passe par un minimum.
  11. Procédé selon la revendication 10, caractérisé en ce que pour régler la quantité d'agent humidifiant, la valeur attribuée de quantité d'agent humidifiant est déterminée, par multiplication avec un facteur prédéterminé du signal de valeur du capteur au minimum, et en ce que, après être passé par le minimum, la quantité d'agent humidifiant fournie est de nouveau augmentée jusqu'à ce que le signal du capteur présente une valeur correspondant à la valeur attribuée de quantité d'agent humidifiant.
  12. Procédé selon la revendication 10, caractérisé en ce que la valeur attribuée de quantité d'agent humidifiant est déterminé par addition d'une valeur prédéterminée à la valeur de signal émanant du capteur au minimun, et en ce que, après passage du minimum, la quantité d'agent humidifiant fournie est de nouveau augmentée, jusqu'à ce que le signal du capteur présente une valeur correspondant à la valeur attribuée de la quantité d'agent humidifiant.
  13. Procédé selon la revendication 11 ou 12, caractérisé en ce que le facteur prédéterminé ou la valeur, ajoutée à la valeur attribuée de quantité d'agent humidifiant, est présélectionnable par l'opérateur machine, et en ce que; après passage du minimum, la quantité d'agent humidifiant fournie est de nouveau augmentée, jusqu'à ce que le signal du capteur présente une valeur correspondant à la valeur attribuée de la quantité d'agent humidifiant.
  14. Procédé selon la revendication 11 ou 12, caractérisé en ce que le facteur prédéterminé ou la valeur, ajoutée à la valeur attribuée de quantité d'agent humidifiant, est déterminé(e) sur la base des valeurs de signaux émanant du capteur, correspondant aux valeurs de consignes d'agent humidifiant pour des applications d'impression précédentes, et mémorisé(e) dans une mémoire de la machine à imprimer.
  15. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'augmentation ou la diminution de la quantité d'encre, pour atteindre la valeur de consigne de quantité d'encre, est effectuée dans un circuit de régulation fermé, en utilisant un ou plusieurs autres capteurs d'encre.
  16. Procédé selon la revendication 15, caractérisé en ce que les capteurs d'encre déterminent, par voie colorimétrique ou densitométrique, la densité d'encre sur la forme d'impression ou le produit imprimé.
  17. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la quantité d'encre fournie à la forme d'impression est réglée, avant étalonnage, à la valeur attribuée de quantité d'encre.
  18. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'étalonnage s'effectue avant la montée en régime, à sa vitesse de fonctionnement, de la machine à imprimer.
  19. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la régulation de la quantité d'agent humidifiant fournie s'effectue dans un circuit de régulation fermé, en fonction d'une valeur de consigne de quantité d'agent humidifiant, de manière à réduire l'oscillation de la valeur de la quantité d'agent humidifiant mesurée autour de la valeur de consigne de la quantité d'agent humidifiant.
EP01126423A 2000-11-24 2001-11-08 Méthode de régulation de l'équilibre encre-solution de mouillage dans une machine d'impression rotative Expired - Lifetime EP1216833B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10058550A DE10058550A1 (de) 2000-11-24 2000-11-24 Verfahren zur Regelung des Farb-zu-Feuchtmittelgleichgewichts in einer Rotations-Offsetdruckmaschine
DE10058550 2000-11-24

Publications (2)

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EP1216833A1 EP1216833A1 (fr) 2002-06-26
EP1216833B1 true EP1216833B1 (fr) 2006-06-28

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EP01126423A Expired - Lifetime EP1216833B1 (fr) 2000-11-24 2001-11-08 Méthode de régulation de l'équilibre encre-solution de mouillage dans une machine d'impression rotative

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US (1) US6668723B2 (fr)
EP (1) EP1216833B1 (fr)
JP (1) JP2002187251A (fr)
AT (1) ATE331622T1 (fr)
DE (2) DE10058550A1 (fr)

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CN106891627A (zh) * 2017-01-22 2017-06-27 杭州电子科技大学 一种确定报纸印刷润湿液预置量的方法

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Publication number Priority date Publication date Assignee Title
CN106891627A (zh) * 2017-01-22 2017-06-27 杭州电子科技大学 一种确定报纸印刷润湿液预置量的方法

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US20020073865A1 (en) 2002-06-20
US6668723B2 (en) 2003-12-30
ATE331622T1 (de) 2006-07-15
JP2002187251A (ja) 2002-07-02
DE10058550A1 (de) 2002-05-29
DE50110325D1 (de) 2006-08-10
EP1216833A1 (fr) 2002-06-26

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