EP1478513A2 - Device and method for correcting a longitudinal register error which is caused by position adjustment - Google Patents

Device and method for correcting a longitudinal register error which is caused by position adjustment

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Publication number
EP1478513A2
EP1478513A2 EP03737285A EP03737285A EP1478513A2 EP 1478513 A2 EP1478513 A2 EP 1478513A2 EP 03737285 A EP03737285 A EP 03737285A EP 03737285 A EP03737285 A EP 03737285A EP 1478513 A2 EP1478513 A2 EP 1478513A2
Authority
EP
European Patent Office
Prior art keywords
rollers
printing process
control unit
involved
printing
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
EP03737285A
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German (de)
French (fr)
Other versions
EP1478513B1 (en
Inventor
Hermann-Josef Veismann
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.)
Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP1478513A2 publication Critical patent/EP1478513A2/en
Application granted granted Critical
Publication of EP1478513B1 publication Critical patent/EP1478513B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/004—Electric or hydraulic features of drives
    • B41F13/0045—Electric driving devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/90—Register control

Definitions

  • the invention relates to a method for correcting the longitudinal register error according to the preamble of claim 1.
  • Printing multicolored printed images with rotary printing presses usually takes place in that the printing material passes through different inking units in succession, each of which applies one color to the printing material, so that the resulting multicolored printed image is created as a layering of several printed images.
  • the accuracy with which this layering is carried out is of great importance for the quality of the printed image.
  • Displacements of the different print images against each other in the printing direction are called longitudinal register errors.
  • the deviations referred to as longitudinal registers or circumferential registers are generally corrected by the machine operator at the beginning of the printing process by the machine operator checking the relative position of so-called register marks which are applied by the various printing units.
  • this method has the disadvantage of a long reaction time and the associated large rejects.
  • DE 195 27 199 therefore suggests registering the register marks with detection sensors during the entire printing process, feeding the measurement results from the sensors to a control and computing unit and performing the longitudinal register correction by at least a short printing cylinder Period with a different peripheral speed than that
  • this process requires permanent optical monitoring of the printed image.
  • the object of the invention is therefore to propose a method which does not require constant monitoring.
  • the invention is based on the finding that both in the pressing and in the operation of rotary printing machines there is a need to adjust the position of the rollers involved in the printing process to one another. In specialist circles, this position setting is called the side-by-side process.
  • printing presses have suitable bearings for the rollers involved in the printing process.
  • a flexographic printing machine is known from DE 40 01 735 A 1, in which the carriages carrying the printing roller and the carriages carrying the inking or anilox rollers are guided in a common carriage guide of the inking unit consoles of the printing press and can be moved jointly or individually by spindle drives.
  • the setting of the printed image is normally carried out as follows.
  • An electronic control device is provided which can access data entered in a storage device.
  • the data relate to the travel between the pressure and the counter pressure roller, taking into account the geometric dimensions of the machine and the diameter of the rollers.
  • This control device then sets the relative roller positions, so that it should be ensured that all parts of the printed image are transferred.
  • the clichés of these rollers are pressed in on the pressure line between the cliché and counter-pressure rollers. At high circular speeds, the roller no longer reaches its actual radius measured before the printing process, since the return speed of the flexible plate material is not sufficient.
  • an effective longitudinal register correction can be carried out without the control device being constantly subjected to evaluation and arithmetic operations, as in the method according to DE 40 01 735 A.
  • the known control devices are the parameters necessary for carrying out the method such as the current relative position of the rollers of the individual printing units is known, so that the method can also be carried out completely without additional measuring devices, such as expensive optical sensors.
  • the method according to the invention can be combined with other known methods. It is thus possible to check the correctness of the register with optical sensors during pre-registration or at certain time intervals and to correct it accordingly.
  • the use of the method according to the invention eliminates the need to constantly carry out measurement and calculation processes. Further exemplary embodiments of the invention are explained in more detail in the present description. The figures show:
  • 9 1 schematically shows a flexographic printing machine with a plurality of
  • Fig. 2 schematically shows a plate roller in the printing process
  • FIG. 1 schematically shows the arrangement of inking units 1 to 8 of a flexographic printing machine 10 around the impression cylinder 11, only the inking units 1, 4 and 8 being shown completely.
  • the inking units are suspended from a machine frame, not shown.
  • the inking unit n (n denotes any of the existing inking units) comprises a plate roller K n and an inking roller F n .
  • the axes of rotation of the plate rollers are denoted by M n and those of the impression cylinder by Mn.
  • the straight lines, which are defined by the axes of rotation Mn and D n are denoted by S n .
  • D n is the pressure line of the plate roller K n on the impression cylinder. Between the straight line S n and the axes of the squeezing BA n arise angle ⁇ n.
  • the effective pressure line between the plate rollers K n and the impression cylinder 11 are denoted by D n .
  • the inking units 1, 4 and 8 show, by way of example, different possibilities for aligning the inking units or the axes of the auxiliary movements BA to the straight line S n , while the other printing units are merely outlined.
  • the side axis BAi thus runs on the straight line Si, so that there is no shifting of the pressure line Di when it is provided.
  • Such an arrangement would be called a strictly radiation-like arrangement of the inking units.
  • An approximately radiating arrangement is shown using inking unit 8.
  • the axis of the supply BA 8 does not run on the beam Ss and the angle (Xs between the supply axis BA 8 and the beam Ss is created.
  • Each additional movement of the roller Ks leads to a shift in the effective pressure line D 8 on the circumference of the rollers 11 involved and Ks.
  • Figure 2 shows the position of the plate cylinder Kg during the printing process using the example of the plate roller Kg.
  • the plate cylinder Kg and other flexible materials involved in the printing process such as the rubber lining of the counter-pressure roller (not shown) and the printing material (also not shown) are exposed to strong forces in the printing process.
  • the cliché 12 is squeezed along the pressure line Dg between the impression cylinder 11 and the cliché roller Kg.
  • a similar process takes place on the printing line 13 between the plate roller Kg and the ink roller Fg.
  • the effective radius Re ff decreases, which denotes the distance between the outer circumference of the plate and the axis of rotation Mg immediately before the pressure line Dg is reached again.
  • this effective radius R eff is decisive for the quality of the printing process.
  • the physical pressure on the printing line Dg decreases and the ink transfer to the printing material can be impaired.
  • FIG. 3 uses the example of a sketched inking unit, the elements of which are provided with reference numerals without indexing the inking unit numbering, to illustrate the geometric relationships when the angle deviates from 0 °.
  • the slowly rotating plate roller has a radius R during the pressing process that hardly varies over its entire circumference and is set against the impression cylinder 11.
  • the position and the radius of the high-speed plate roller Kg which is shown here in broken lines, illustrates the further course of the printing process. If the printing speed increases, the radius of the plate roller relevant for the printing process decreases from R to R eff in this exemplary embodiment. In order to nevertheless guarantee an optimal ink transfer, the axis of rotation M of the plate roller is moved from the position Pi to the position P 2 . The latter position forms the center of the dashed, high-speed cliché roller K s .
  • FIG. 3 shows that the plate roller Kg has a pressure line D s with the counterpressure cylinder 11 due to the provisioning process, which is located at a different location than the pressure line Di of the slowly rotating plate roller K

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Error Detection And Correction (AREA)
  • Printing Methods (AREA)
  • Rotary Presses (AREA)

Abstract

A process for correcting the longitudinal registration error of a rotary printing press with several inking systems in which a control unit adjusts the desired application line of the printing plate on the material web lying on one of the two rollers. In making the adjustment, the control unit takes into account the shift of the effective print line that arises as a consequence of an adjustment movement of one of the two rollers along an axis that does not run coincident with the connecting line of the axes of rotation of the two rollers, and determines correction values from the relative positions of the two rollers and the inking system, and the angle between the connecting line of the axes of rotation and the axis of adjustment.

Description

Vorrichtung und Verfahren zur Korrektur des Längsregisterfehlers, welcher durch die Beistellung auftrittDevice and method for correcting the longitudinal register error that occurs due to the provision
Die Erfindung betrifft ein Verfahren zur Korrektur des Längsregisterfehlers gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for correcting the longitudinal register error according to the preamble of claim 1.
Das Drucken mehrfarbiger Druckbilder mit Rotationsdruckmaschinen erfolgt in der Regel dadurch, dass der Bedruckstoff nacheinander verschiedene Farbwerke durchläuft, welche den Bedruckstoff jeweils mit einer Farbe beaufschlagen, so dass das entstehende mehrfarbige Druckbild als Übereinanderschichtung mehrerer Druckbilder entsteht. Der Genauigkeit, mit der diese Schichtung vorgenommen wird, kommt große Bedeutung für die Qualität des Druckbildes zu. Verschiebungen der verschiedenen Druckbilder gegeneinander in Bedruckrichtung werden Längsregisterfehler genannt. Die Längsregister oder Umfangsregister genannten Abweichungen werden in der Regel durch die Maschinenbediener zu Beginn des Druckprozesses korrigiert, indem der Maschinenbediener die Relativposition sogenannter Registermarken kontrolliert, die durch die verschiedenen Druckwerke aufgebracht werden. Dieses Verfahren hat jedoch den Nachteil einer langen Reaktionszeit und des damit verbundenen großen Ausschusses.Printing multicolored printed images with rotary printing presses usually takes place in that the printing material passes through different inking units in succession, each of which applies one color to the printing material, so that the resulting multicolored printed image is created as a layering of several printed images. The accuracy with which this layering is carried out is of great importance for the quality of the printed image. Displacements of the different print images against each other in the printing direction are called longitudinal register errors. The deviations referred to as longitudinal registers or circumferential registers are generally corrected by the machine operator at the beginning of the printing process by the machine operator checking the relative position of so-called register marks which are applied by the various printing units. However, this method has the disadvantage of a long reaction time and the associated large rejects.
Die DE 195 27 199 schlägt daher in Bezug auf eine Flexodruckmaschine vor, die Registermarken mit Erkennungssensoren während des gesamten Druckprozesses zu registrieren, die Messergebnisse der Sensoren einer Steuer- und Recheneinheit zuzuführen und die Längsregisterkorrektur dadurch vorzunehmen, dass die jeweiligen Druckzylinder zumindest für einen kurzen Zeitraum mit einer anderen Umfangsgeschwindigkeit als derWith regard to a flexographic printing press, DE 195 27 199 therefore suggests registering the register marks with detection sensors during the entire printing process, feeding the measurement results from the sensors to a control and computing unit and performing the longitudinal register correction by at least a short printing cylinder Period with a different peripheral speed than that
Gegendruckzylinder beaufschlagt werden.Back pressure cylinders are applied.
Bei der Anwendung des in der DE 195 27 199 skizzierten Verfahrens zurWhen using the method outlined in DE 195 27 199
Korrektur des Längsregisters während des gesamten Druckprozesses ist es jedoch erforderlich, dass die genannten optischen Erkennungssensoren dasCorrection of the longitudinal register during the entire printing process, however, it is necessary that the optical detection sensors mentioned
Druckbild dauernd überwachen, die Steuereinheit mit Messsignalen versorgen woraufhin dieselbe die zur Registerkorrektur notwendige Steuerung derConstantly monitor the print image, supply the control unit with measurement signals, whereupon the control unit controls the control necessary for register correction
Geschwindigkeit der verschiedenen Druckwalzen vornimmt.Speed of the various printing rollers.
Dieses Verfahren erfordert also unter anderem eine dauernde optische Überwachung des Druckbildes.Among other things, this process requires permanent optical monitoring of the printed image.
Aufgabe der Erfindung ist es daher, ein Verfahren vorzuschlagen, welches ohne dauernde Überwachung auskommt.The object of the invention is therefore to propose a method which does not require constant monitoring.
Diese Aufgabe wird durch den kennzeichnenden Teil des Anspruchs 1 gelöst.This object is solved by the characterizing part of claim 1.
Der Erfindung liegt die Erkenntnis zugrunde, dass sowohl beim Andruck als auch beim Betrieb von Rotationsdruckmaschinen die Notwendigkeit besteht, die Position der an dem Druckprozess beteiligten Walzen aufeinander einzustellen. In Fachkreisen wird diese Positionseinstellung Beistellprozess genannt.The invention is based on the finding that both in the pressing and in the operation of rotary printing machines there is a need to adjust the position of the rollers involved in the printing process to one another. In specialist circles, this position setting is called the side-by-side process.
Um diesen Beistellprozess zu ermöglichen, verfügen Druckmaschinen über geeignete Lagerungen der am Druckprozess beteiligten Walzen. So ist aus DE 40 01 735 A 1 eine Flexodruckmaschine bekannt, bei der die die Druckwalze tragenden Schlitten und die die Farbauftrags- oder Rasterwalzen tragenden Schlitten in einer gemeinsamen Schlittenführung der Farbwerkskonsolen der Druckmaschine geführt werden und gemeinsam oder einzeln durch Spindelantriebe verfahrbar sind.In order to enable this supply process, printing presses have suitable bearings for the rollers involved in the printing process. For example, a flexographic printing machine is known from DE 40 01 735 A 1, in which the carriages carrying the printing roller and the carriages carrying the inking or anilox rollers are guided in a common carriage guide of the inking unit consoles of the printing press and can be moved jointly or individually by spindle drives.
Bei Rotationsdruckmaschinen dieser bekannten Art erfolgt die Einstellung des Druckbildes normalerweise folgendermaßen. Eine elektronische Steuereinrichtung ist vorgesehen, die auf in eine Speichereinrichtung eingegebene Daten zurückgreifen kann. Die Daten betreffen den Stellweg zwischen der Druck- und der Gegendruckwalze unter Berücksichtigung der geometrischen Abmessungen der Maschine und der Durchmesser der Walzen. Diese Steuereinrichtung stellt dann die relativen Walzenpositionen ein, so dass gewährleistet sein sollte, dass sämtliche Teile des Druckbildes übertragen werden.In rotary printing presses of this known type, the setting of the printed image is normally carried out as follows. An electronic control device is provided which can access data entered in a storage device. The data relate to the travel between the pressure and the counter pressure roller, taking into account the geometric dimensions of the machine and the diameter of the rollers. This control device then sets the relative roller positions, so that it should be ensured that all parts of the printed image are transferred.
Allerdings besitzen die verschiedenen Walzen, Druckformen sowie die zu bedruckenden Materialien und alle anderen beteiligten Teile geometrische Toleranzen, so dass oft ein zusätzlicher Beistellvorgang notwendig wird. Dieser Beistellvorgang erfolgt durch den Druckmaschinenführer, der die Walzenpositionen einstellt, während er das Druckbild beobachtet.However, the various rollers, printing forms as well as the materials to be printed and all other parts involved have geometrical tolerances, so that an additional supply process is often necessary. This process is carried out by the press operator, who adjusts the roller positions while observing the print image.
Durch diese Art der Einstellung des Druckbildes ist sichergestellt, dass mit geringstem Andruck der am Druckprozess beteiligten Walzen gegeneinander ein vollständiger Übertrag des Druckbildes stattfindet. Weitere Einzelheiten zu Beistellprozessen, welche auch vollautomatisch ablaufen können, sind in der noch unveröffentlichten deutschen Patentanmeldung mit dem Aktenzeichen 101 45 957.2 enthalten.This type of adjustment of the print image ensures that the print image is transferred completely against one another with minimal pressure on the rollers involved in the printing process. Further details on auxiliary processes, which can also run fully automatically, are contained in the as yet unpublished German patent application with the file number 101 45 957.2.
Neben den skizzierten, beim Andruckprozess vorzunehmenden Beistellvorgängen ist es oft nötig, einen so genannten dynamischen Beistellprozess durchzuführen. Darunter ist Folgendes zu verstehen: Bei höheren Druckgeschwindigkeiten kommt es zu Änderungen des effektiven Durchmessers von am Druckprozess beteiligten Walzen. Davon betroffen sind beispielsweise die Klischeewalzen beim Flexodruck.In addition to the sketched side processes to be carried out during the pressing process, it is often necessary to carry out a so-called dynamic side process. This means the following: At higher printing speeds, the effective diameter of the rollers involved in the printing process changes. This affects, for example, the cliché rollers in flexographic printing.
Die Klischees dieser Walzen werden an der Drucklinie zwischen Klischee- und Gegendruckwalze eingedrückt. Bei hohen Kreisgeschwindigkeiten erreicht die Walze nicht mehr ihren eigentlichen vor dem Druckvorgang gemessenen Radius, da die Rückstellgeschwindigkeit des flexiblen Klischeematerials nicht ausreicht.The clichés of these rollers are pressed in on the pressure line between the cliché and counter-pressure rollers. At high circular speeds, the roller no longer reaches its actual radius measured before the printing process, since the return speed of the flexible plate material is not sufficient.
Beim Einsatz sehr flexibler Materialien ist es aber auch möglich, dass der effektive Durchmesser infolge der kreisgeschwindigkeitsabhängigen Fliehkraft zunimmt. In beiden Fällen ändert sich der Druck zwischen den direkt am Druckprozess beteiligten Walzen. Diesem Umstand wird mit einem weiteren Beistellungsprozess, der so genannten dynamischen Beistellung begegnet. Zweckmäßig ist es in diesem Zusammenhang, diese Art der Beistellung automatisch vorzunehmen, indem eine Steuereinheit die notwendigen Korrekturen der Relativpositionen der Walzen als Funktion der oft empirisch festgehaltenen Materialparameter der Walzen und der Druckgeschwindigkeit ermittelt.When using very flexible materials, it is also possible that the effective diameter increases due to the centrifugal force that is dependent on the circular speed. In both cases, the pressure changes between the rollers directly involved in the printing process. This fact is countered with a further provision process, the so-called dynamic provision. In this context, it is expedient to carry out this type of provision automatically, in that a control unit does the necessary Corrections of the relative positions of the rollers as a function of the often empirically recorded material parameters of the rollers and the printing speed were determined.
Eine Untersuchung der geometrischen Anordnung der beiden direkt am Druckprozess beteiligten Walzen eines Farbwerks ergibt jedoch, dass die meisten Beistellbewegungen in Druckmaschinen bekannter Art entlang von Achsen erfolgen, die nicht parallel zu der Verbindungslinie der Drehachsen der beiden am Druckprozess beteiligten Walzen verlaufen. Beistellbewegungen dieser Art ziehen daher eine Verschiebung der tatsächlichen effektiven Drucklinie auf dem Umfang der Walzen nach sich. Jede Verschiebung dieser Drucklinie führt zu einem Längsregisterfehler.However, an examination of the geometrical arrangement of the two rollers of an inking unit directly involved in the printing process shows that most of the additional movements in printing presses of known type take place along axes which are not parallel to the connecting line of the axes of rotation of the two rollers involved in the printing process. Side movements of this type therefore result in a shift in the actual effective pressure line on the circumference of the rollers. Every shift of this pressure line leads to a longitudinal register error.
Berechnungen zeigen, dass der Anteil dieser Fehler an den während des Druckprozesses auftretenden Längsregisterfehlern erheblich ist und zum Teil sogar den Anteil aller anderen Fehlereinträge übersteigt.Calculations show that the proportion of these errors in the longitudinal register errors occurring during the printing process is considerable and in some cases even exceeds the proportion of all other error entries.
Daher kann mit dem erfindungsgemäßen Verfahren eine effektive Längsregisterkorrektur vorgenommen werden, ohne dass die Steuereinrichtung ständig mit Auswerte- und Rechenoperationen beaufschlagt wird wie bei dem Verfahren gemäß der DE 40 01 735 A In der Regel sind den bekannten Steuereinrichtungen die zur Durchführung des Verfahrens notwendigen Parameter wie die augenblickliche Relativposition der Walzen der einzelnen Druckwerke bekannt, so dass sich das Verfahren auch völlig ohne zusätzliche Messvorrichtungen - wie teure optische Sensoren - durchführen lässt. Darüber hinaus ist es möglich, das erfindungsgemäße Verfahren so zu implementieren, dass die Steuervorrichtung nur dann Korrekturwerte ermittelt, wenn tatsächlich Änderungen der Relativposition der Walzen vorgenommen werden, so dass auch der Rechen- und Steueraufwand eingeschränkt wird.Therefore, with the method according to the invention, an effective longitudinal register correction can be carried out without the control device being constantly subjected to evaluation and arithmetic operations, as in the method according to DE 40 01 735 A. As a rule, the known control devices are the parameters necessary for carrying out the method such as the current relative position of the rollers of the individual printing units is known, so that the method can also be carried out completely without additional measuring devices, such as expensive optical sensors. In addition, it is possible to implement the method according to the invention in such a way that the control device only determines correction values when changes in the relative position of the rollers are actually made, so that the computing and control effort is also limited.
Gleichwohl ist das erfindungsgemäße Verfahren mit anderen bekannten Verfahren kombinierbar. So ist es möglich, bei der Vorregisterung oder in gewissen zeitlichen Intervallen die Registerhaltigkeit mit optischen Sensoren zu überprüfen und dementsprechend zu korrigieren. Durch den Einsatz des erfindungsgemäßen Verfahrens entfällt jedoch die Notwendigkeit, ständig Mess- und Rechenvorgänge durchzuführen. Weitere Ausführungsbeispiele der Erfindung werden in der gegenständlichen Beschreibung näher erläutert. Die Figuren zeigen:Nevertheless, the method according to the invention can be combined with other known methods. It is thus possible to check the correctness of the register with optical sensors during pre-registration or at certain time intervals and to correct it accordingly. However, the use of the method according to the invention eliminates the need to constantly carry out measurement and calculation processes. Further exemplary embodiments of the invention are explained in more detail in the present description. The figures show:
9 1 schematisch eine Flexodruckmaschine mit einer Mehrzahl von 9 1 schematically shows a flexographic printing machine with a plurality of
Druckwerkenprinting units
Fig 2 schematisch eine Klischeewalze im DruckprozessFig. 2 schematically shows a plate roller in the printing process
Fig 3 schematisch die Konsequenzen einer dynamischen Beisellung3 schematically shows the consequences of a dynamic addition
Figur 1 zeigt schematisch die Anordnung von Farbwerken 1 bis 8 einer Flexodruckmaschine 10 um den Gegendruckzylinder 11 , wobei lediglich die Farbwerke 1 , 4 und 8 vollständig dargestellt sind. Für die anderen Farbwerke ist lediglich die Position der Klischeewalzen angeben. Die Farbwerke sind an einem nicht dargestellten Maschinengestell aufgehängt. Das Farbwerk n (n bezeichnet ein beliebiges der vorhandenen Farbwerke) umfasst eine Klischeewalze Kn und eine Farbwalze Fn. Die Drehachsen der Klischeewalzen werden mit Mn und die des Gegendruckzylinders mit M-n bezeichnet. Die Geraden, welche durch die Drehachsen Mn und Dn festgelegt sind, sind mit Sn bezeichnet. Dabei ist Dn die Drucklinie der Klischeewalze Kn auf den Gegendruckzylinder. Zwischen den Geraden Sn und den Achsen der Beistellbewegung BAn entstehen Winkel αn. Die effektive Drucklinie zwischen den Klischeewalzen Kn und dem Gegendruckzylinder 11 sind mit Dn bezeichnet.FIG. 1 schematically shows the arrangement of inking units 1 to 8 of a flexographic printing machine 10 around the impression cylinder 11, only the inking units 1, 4 and 8 being shown completely. For the other inking units, only the position of the plate rollers is specified. The inking units are suspended from a machine frame, not shown. The inking unit n (n denotes any of the existing inking units) comprises a plate roller K n and an inking roller F n . The axes of rotation of the plate rollers are denoted by M n and those of the impression cylinder by Mn. The straight lines, which are defined by the axes of rotation Mn and D n , are denoted by S n . D n is the pressure line of the plate roller K n on the impression cylinder. Between the straight line S n and the axes of the squeezing BA n arise angle α n. The effective pressure line between the plate rollers K n and the impression cylinder 11 are denoted by D n .
Die Farbwerke 1 , 4 und 8 zeigen beispielhaft verschiedene Möglichkeiten der Ausrichtung der Farbwerke beziehungsweise der Achsen der Beistellbewegungen BA zu den Geraden Sn, während die anderen Druckwerke lediglich skizziert werden. So verläuft die Beistellachse BAi auf der Geraden Si, so dass es bei einer Beistellung zu keiner Verschiebung der Drucklinie Di kommt. Eine solche Anordnung würde man eine streng strahlenartige Anordnung der Farbwerke nennen. Eine solche Anordnung ist jedoch maschinenbaulich sehr anspruchsvoll und daher bei modernen Druckmaschinen nicht anzutreffen. Eine annähernd strahlenförmige Anordnung wird anhand von Farbwerk 8 gezeigt. Die Achse der Beistellung BA8 verläuft nicht auf dem Strahl Ss und es entsteht der Winkel (Xs zwischen der Beistellachse BA8 und dem Strahl Ss. Jede Beistellbewegung der Walze Ks führt zu einer Verschiebung der effektiven Drucklinie D8 auf dem Umfang der beteiligten Walzen 11 und Ks.The inking units 1, 4 and 8 show, by way of example, different possibilities for aligning the inking units or the axes of the auxiliary movements BA to the straight line S n , while the other printing units are merely outlined. The side axis BAi thus runs on the straight line Si, so that there is no shifting of the pressure line Di when it is provided. Such an arrangement would be called a strictly radiation-like arrangement of the inking units. However, such an arrangement is very demanding in terms of mechanical engineering and is therefore not found in modern printing machines. An approximately radiating arrangement is shown using inking unit 8. The axis of the supply BA 8 does not run on the beam Ss and the angle (Xs between the supply axis BA 8 and the beam Ss is created. Each additional movement of the roller Ks leads to a shift in the effective pressure line D 8 on the circumference of the rollers 11 involved and Ks.
Die maschinenbaulich und fertigungstechnisch am einfachsten umzusetzende Variante der Anordnung eines Farbwerkes ist die so genannte Schubladenanordnung, die anhand des Farbwerks 4 gezeigt ist. Hier verläuft die Beistellachse BA horizontal, so dass der Winkel α4 und der durch die Beistellung entstehende Registerfehler noch größer ist als bei Farbwerk 8.The variant of the arrangement of an inking unit that is easiest to implement in terms of mechanical engineering and production technology is the so-called drawer arrangement, which is shown with the aid of the inking unit 4. Here the side axis BA runs horizontally, so that the angle α 4 and the register error resulting from the provision is even greater than with the inking unit 8.
Die Figur 2 zeigt am Beispiel der Klischeewalze Kg die Lage des Klischeezylinders Kg während des Druckprozesses. Der Klischeezylinder Kg und andere flexible am Druckprozess beteiligte Materialien wie der nicht dargestellte Gummibelag der Gegendruckwalze und der ebenfalls nicht dargestellte Bedruckstoff sind im Druckprozess starken Kräften ausgesetzt. So wird das Klischee 12 entlang der Drucklinie Dg zwischen Gegendruckzylinder 1 1 und Klischeewalze Kg eingequetscht. Ein ähnlicher Vorgang findet an der Drucklinie 13 zwischen Klischeewalze Kg und Farbwalze Fg statt. Bei einer schnellen Rotation der Walze Kg um ihre Drehachse Mg kann es dazu kommen, dass die Deformation v. a. des Klischees an den vorgenannten Drucklinien Kg und 13 nicht mehr durch die Rückstellkräfte des verquetschten Materials 11 , 12, Kg wettgemacht wird, bevor das verquetschte Material erneut die Dg beziehungsweise Dn erreicht. Daher sinkt in diesem Fall der effektive Radius Reff der den Abstand zwischen dem Außenumfang des Klischees und der Drehachse Mg unmittelbar vor dem erneuten Erreichen der Drucklinie Dg bezeichnet. Dieser effektive Radius Reff ist jedoch entscheidend für die Güte des Druckprozesses. In dem oben beschriebenen Fall des Schrumpfens des effektiven Radius lässt der physikalische Druck an der Drucklinie Dg nach und es kann zu einer Beeinträchtigung des Farbübertrags auf den Bedruckstoff kommen. In diesem Fall wird der Maschinenbediener oder die Maschinensteuerung einer Flexodruckmaschine die Klischeewalze stärker an die Gegendruckwalze 11 anstellen. Angesichts der hohen Fliehkräfte kann es bei der Verwendung anderer Materialien jedoch auch zu einer Vergrößerung des effektiven Radius Reff kommen, die ein Ansteigen des physikalischen Drucks an der Drucklinie Dg nach sich zieht. In diesem Fall wird die Klischeewalze Kg etwas weiter von dem Gegendruckzylinder 11 abgefahren. Beide Vorgänge werden im Allgemeinen unter dem Fachterminus dynamische Beistellung zusammengefasst.Figure 2 shows the position of the plate cylinder Kg during the printing process using the example of the plate roller Kg. The plate cylinder Kg and other flexible materials involved in the printing process, such as the rubber lining of the counter-pressure roller (not shown) and the printing material (also not shown) are exposed to strong forces in the printing process. Thus, the cliché 12 is squeezed along the pressure line Dg between the impression cylinder 11 and the cliché roller Kg. A similar process takes place on the printing line 13 between the plate roller Kg and the ink roller Fg. With a rapid rotation of the roller Kg about its axis of rotation Mg, the deformation va of the cliché at the aforementioned pressure lines Kg and 13 can no longer be compensated for by the restoring forces of the squeezed material 11, 12, Kg before the squeezed material again the Dg or D n reached. Therefore, in this case, the effective radius Re ff decreases, which denotes the distance between the outer circumference of the plate and the axis of rotation Mg immediately before the pressure line Dg is reached again. However, this effective radius R eff is decisive for the quality of the printing process. In the case of the effective radius shrinking described above, the physical pressure on the printing line Dg decreases and the ink transfer to the printing material can be impaired. In this case, the machine operator or the machine controller of a flexographic printing machine will position the plate roller more strongly against the counter-pressure roller 11. In view of the high centrifugal forces, however, the use of other materials can also increase the effective radius R e ff, which results in an increase in the physical pressure on the pressure line Dg. In this case, the plate roller Kg is moved a little further from the impression cylinder 11. Both processes are generally summarized under the term “dynamic provision”.
Figur 3 verdeutlicht am Beispiel eines skizzierten Farbwerkes, dessen Elemente mit Bezugszeichen ohne Indizierung der Farbwerksnumerierung versehen sind, die geometrischen Verhältnisse, wenn der Winkel von 0° abweicht.FIG. 3 uses the example of a sketched inking unit, the elements of which are provided with reference numerals without indexing the inking unit numbering, to illustrate the geometric relationships when the angle deviates from 0 °.
Die langsam rotierende Klischeewalze besitzt während des Andruckprozesses einen Radius R, der über ihren gesamten Umfang kaum variiert und ist an den Gegendruckzylinder 11 angestellt.The slowly rotating plate roller has a radius R during the pressing process that hardly varies over its entire circumference and is set against the impression cylinder 11.
Die Position und der Radius der schnell laufenden Klischeewalze Kg , welche hier gestrichelt dargestellt ist, verdeutlicht den weiteren Verlauf des Druckvorgangs. Bei einer Steigerung der Druckgeschwindigkeit verringert sich in diesem Ausführungsbeispiel der für den Druckvorgang relevante Radius der Klischeewalze von R zu Reff. Um trotzdem einen optimalen Farbübertrag zu gewährleisten, wird die Drehachse M der Klischeewalze von der Position Pi in die Position P2 gefahren. Die letztere Position bildet den Mittelpunkt der gestichelt dargestellten schnell laufenden Klischeewalze Ks. Figur 3 zeigt, dass die Klischeewalze Kg aufgrund des Beistellvorgangs eine Drucklinie Ds mit dem Gegendruckzyliπder 11 aufweist, die sich an einer anderen Stelle befindet als die Drucklinie Di der langsam rotierenden Klischeewalze K|. Der Abstand A zwischen beiden Drucklinien führt zu einem Längsregisterfehler, dem mit dem erfindungsgemäßen Verfahren abgeholfen wird. Es versteht sich, dass die Veränderung des Radius im Laufe des Druckprozesses in Figur 3 aus darstellerischen Gründen nicht maßstäblich dargestellt wurde. The position and the radius of the high-speed plate roller Kg, which is shown here in broken lines, illustrates the further course of the printing process. If the printing speed increases, the radius of the plate roller relevant for the printing process decreases from R to R eff in this exemplary embodiment. In order to nevertheless guarantee an optimal ink transfer, the axis of rotation M of the plate roller is moved from the position Pi to the position P 2 . The latter position forms the center of the dashed, high-speed cliché roller K s . FIG. 3 shows that the plate roller Kg has a pressure line D s with the counterpressure cylinder 11 due to the provisioning process, which is located at a different location than the pressure line Di of the slowly rotating plate roller K |. The distance A between the two printing lines leads to a longitudinal register error, which is remedied with the method according to the invention. It goes without saying that the change in the radius during the printing process was not shown to scale in FIG. 3 for illustrative reasons.

Claims

Patentansprüche claims
1. Verfahren zur Korrektur des Längsregisters einer Rotationsdruckmaschine mit mehreren Farbwerken (1-9);' bei dem eine Steuereinheit die gewünschte Auflagelinie (D) des1. Method for correcting the longitudinal register of a rotary printing press with several inking units (1-9); ' in which a control unit the desired support line (D) of
Klischees auf der auf einer der beiden Walzen aufliegendenClichés on the one lying on one of the two rollers
Materialbahn einstellt, indem sie den oder die Antriebe der beiden direkt am Druckprozess beteiligten Walzen (11 , Kn) einesMaterial web adjusts by one or the drives of the two rollers (11, K n ) directly involved in the printing process
Farbwerkes so steuert, dass die beiden Walzen zumindest während eines Zeitraums eine unterschiedliche Umfangsgeschwindigkeit aufweisen dadurch gekennzeichnet, dass die Steuereinheit die Verschiebung (A) der tatsächlichen, effektivenInking unit controls so that the two rollers have a different peripheral speed at least for a period of time, characterized in that the control unit adjusts the displacement (A) of the actual effective
Drucklinie auf dem Umfang beider Walzen (11 , Kn) bei der Korrektur berücksichtigt, welche infolge einer Beistellbewegung einer der beiden amPressure line on the circumference of both rollers (11, K n ) taken into account in the correction, which is due to an additional movement of one of the two
Druckprozess beteiligten Walzen entlang einer Achse (BAn) entsteht, die nicht parallel zu der Verbindungslinie (Sn) derPrinting process involved rolls along an axis (BA n ) that is not parallel to the connecting line (S n ) of the
Drehachsen (Mn, Mn) der beiden am Druckprozess beteiligtenRotation axes (M n , Mn) of the two involved in the printing process
Walzen verläuft, indem die Steuereinheit aus der Relativposition der beiden direkt am Druckprozess beteiligten Walzen (11 , Kn) eines Farbwerks (N) und dem Winkel (α) zwischen der Verbindungslinie (Sn) derRolling runs in that the control unit from the relative position of the two rollers (11, K n ) directly involved in the printing process of an inking unit (N) and the angle (α) between the connecting line (S n ) of the
Drehachsen der beiden am Druckprozess beteiligten Walzen und der Achse der Beistellung (BAn) Korrekturwerte ermittelt.Axes of rotation of the two rollers involved in the printing process and the axis of the provision (BA n ) correction values were determined.
2. Verfahren nach Anspruch 1 dadurch gekennzeichnet, dass die Steuereinheit bei der Ermittlung der Korrekturwerte auf eine Speichervorrichtung zurückgreift, in welcher die Korrekturwerte in Abhängigkeit von der relativen Walzenposition aufgetragen sind. 2. The method according to claim 1, characterized in that the control unit uses a storage device in the determination of the correction values, in which the correction values are plotted as a function of the relative roller position.
3. Verfahren nach Anspruch 1 oder 2 dadurch gekennzeichnet, dass die Steuereinheit bei der Ermittlung der Korrekturwerte auf eine Recheneinheit zurückgreift, welche mit Hilfe eines Rechenalgorithmus aus der Relativposition der beiden direkt am Druckprozess beteiligten Walzen (11 , Kn) eines Farbwerks (n) und dem Winkel ( ) zwischen der Verbindungslinie (Sn) der Drehachsen der beiden am Druckprozess beteiligten Walzen und der Achse der Beistellung (BAn) Korrekturwerte ermittelt.3. The method according to claim 1 or 2, characterized in that the control unit uses a computing unit when determining the correction values, which uses an arithmetic algorithm from the relative position of the two rollers (11, K n ) of an inking unit (s) directly involved in the printing process. and the angle () between the connecting line (S n ) of the axes of rotation of the two rollers involved in the printing process and the axis of the provided (BA n ) correction values.
4. Verfahren nach einem der vorstehenden Ansprüche dadurch gekennzeichnet, dass die Steuereinheit zunächst eine Vorregisterung insbesondere während des Andruckprozesses vornimmt, indem sie die Relativposition von Bestandteilen der Druckbilder, welche mit optischen Sensoren aufgezeichnet wird, auswertet.4. The method according to any one of the preceding claims, characterized in that the control unit first performs a pre-registration, in particular during the pressing process, by evaluating the relative position of components of the printed images, which is recorded with optical sensors.
5. Verfahren nach einem der vorstehenden Ansprüche dadurch gekennzeichnet, dass die Steuereinheit in geeigneten zeitlichen Intervallen eine Registerkorrektur vornimmt, indem sie die Relativposition von Bestandteilen der Druckbilder, welche mit optischen Sensoren aufgezeichnet wird, auswertet.5. The method according to any one of the preceding claims, characterized in that the control unit carries out a register correction at suitable time intervals by evaluating the relative position of components of the printed images, which is recorded with optical sensors.
6. Rotationsdruckmaschine mit mehreren Farbwerken (n) bei der eine Steuereinheit die gewünschte Auflagelinie (D) des Klischees auf der auf einer der beiden Walzen aufliegenden Materialbahn einstellt, indem sie den oder die Antriebe der beiden direkt am Druckprozess beteiligten Walzen (11 , Kn) eines Farbwerkes so steuert, dass die beiden Walzen zumindest während eines Zeitraums eine unterschiedliche Umfangsgeschwindigkeit aufweisen dadurch gekennzeichnet, dass die Steuereinheit die Verschiebung (A) der tatsächlichen, effektiven Drucklinie auf dem Umfang beider Walzen (11 , Kn) bei der Korrektur berücksichtigt, welche infolge einer Beistellbewegung einer der beiden am Druckprozess beteiligten Walzen entlang einer Achse (BAn) entsteht, die nicht parallel zu der Verbindungslinie (Sn) der Drehachsen (Mn ,Mn) der beiden am Druckprozess beteiligten Walzen verläuft, indem die Steuereinheit aus der Relativposition der beiden direkt am Druckprozess beteiligten Walzen (11 , Kn) eines Farbwerks (N) und dem Winkel (α) zwischen der Verbindungslinie (Sn) der Drehachsen der beiden am Druckprozess beteiligten Walzen und der Achse der Beistellung (BAn) Korrekturwerte ermittelt. 6. Rotary printing machine with several inking units (n) in which a control unit sets the desired support line (D) of the cliché on the material web lying on one of the two rollers, by the drive (s) of the two rollers (11, K n ) controls an inking unit in such a way that the two rollers have a different peripheral speed at least during a period, characterized in that the control unit takes into account the shift (A) of the actual, effective printing line on the circumference of both rollers (11, K n ) in the correction which arises as a result of an additional movement of one of the two rollers involved in the printing process along an axis (BA n ) which is not runs parallel to the connecting line (S n ) of the axes of rotation (M n , Mn) of the two rollers involved in the printing process in that the control unit from the relative position of the two rollers (11, K n ) of an inking unit (N) and the directly involved in the printing process Angle (α) between the connecting line (S n ) of the axes of rotation of the two rollers involved in the printing process and the axis of the provision (BA n ) correction values were determined.
EP03737285A 2002-02-05 2003-01-29 Device and method for correcting a longitudinal register error which is caused by position adjustment Expired - Lifetime EP1478513B1 (en)

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DE10204514A DE10204514B4 (en) 2002-02-05 2002-02-05 Apparatus and method for correcting the longitudinal registration error which occurs due to the provision
DE10204514 2002-02-05
PCT/EP2003/000882 WO2003066332A2 (en) 2002-02-05 2003-01-29 Device and method for correcting a longitudinal register error which is caused by position adjustment

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AT (1) ATE355969T1 (en)
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DE102015108126A1 (en) * 2015-05-22 2016-11-24 Windmöller & Hölscher Kg Printing machine and method for employment of several inking units of a printing press

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WO2003066332A2 (en) 2003-08-14
DE10204514A1 (en) 2003-08-14
US7100509B2 (en) 2006-09-05
EP1478513B1 (en) 2007-03-07
ES2282642T3 (en) 2007-10-16
US20050016406A1 (en) 2005-01-27
DE10204514B4 (en) 2006-03-23
ATE355969T1 (en) 2007-03-15

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