EP3455073B1 - Method and device for printing a web-like printing substrate within a rotary printing press - Google Patents

Method and device for printing a web-like printing substrate within a rotary printing press Download PDF

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Publication number
EP3455073B1
EP3455073B1 EP17719569.0A EP17719569A EP3455073B1 EP 3455073 B1 EP3455073 B1 EP 3455073B1 EP 17719569 A EP17719569 A EP 17719569A EP 3455073 B1 EP3455073 B1 EP 3455073B1
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Prior art keywords
printing
web
length
roller
print
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EP17719569.0A
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German (de)
French (fr)
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EP3455073A1 (en
Inventor
Mario FRANKENBERG
Rainer Ehrenberg
Frank Westhof
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Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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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
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B41F13/14—Registering devices with means for displacing the cylinders

Definitions

  • the invention relates to a method and a device for printing a web of printing material within a rotary printing press.
  • Rotary printing machines in which a print motif is repeatedly applied to a substrate web, print motifs are applied by a printing roller.
  • the web of printing material runs on an impression cylinder.
  • the peripheral speeds of the printing roller and the impression cylinder are the same.
  • Print length is the distance between two identical points within two consecutive print motifs. These can be the register points, for example.
  • the position of the print on the unwound material web is corrected by correcting the web tension by means of a web tension-controlled feeder in front of the printing roller in such a way that the print material web is stretched to a constant print length by, depending on the measured print length, the material with a higher or lower web tension is influenced in its elongation in order to be able to feed a printing material web to the printing roller, which has both a constant repeat length that corresponds to the print length of the new print and the position of the new print.
  • the U.S. 3,559,568 describes a method for adapting the print length to a target print length, the printed print length being measured and, in the event of a deviation, the printed print length being adapted in order to reduce the deviation.
  • the measurement therefore takes place behind the printing unit and is not compared with a motif that has already been printed on the back.
  • the US 2006/0016359 A1 deals with the problem that a printed roll changes an actual length during storage. These changes are modeled and the print length is varied according to this model. The print lengths are also measured and compared to the target print length. The print length is therefore adjusted based on the predictive model.
  • the DE 195 47 074 A1 deals with the printing of a tubular packaging material. In order to achieve register accuracy when printing the back, markings are printed with a non-visible UV ink, which are used to adjust the register. Register marks are therefore necessary. Thus, the DE 195 47 074 A1 a method according to the preamble of claim 1 and a corresponding printing machine for performing the same.
  • the disadvantages of this method are that the influence on the correction of the repeat length is limited by changing the web tension.
  • the web tension must not be arbitrarily low in order to shorten the repeat length, as a minimum web tension is always required. to drive the material web safely through the machine.
  • the web tension must not be arbitrarily high in order to achieve an extension of the repeat catch, since web tension that is too high can permanently change the printing material by causing permanent plastic deformation if the material-typical yield point is exceeded.
  • the object of the present invention is therefore to propose a method and a device for printing a printing material web within a rotary printing press, with which the disadvantages described above can be avoided.
  • a print motif is applied to the printing material with at least one printing roller, the printing roller rotating at a peripheral speed, a printing length being measured by means of at least one measuring device arranged within the rotary printing machine and the peripheral speed of the at least one printing roller being changed if the measured print length deviates from a target print length.
  • the core idea of the invention is therefore to measure the printing length on the printing material and to change the circumferential speed of the printing roller to match if this measured printing length deviates from a target printing length.
  • the printing length can now be changed, in which case the circumferential speed of the impression cylinder is not changed or at least not changed to the same extent. So it can come to different circumferential speeds of the printing roller and the impression cylinder.
  • the relationship here is that if the speed of the format cylinder drives is lower than the web speed, longer formats are printed and if the speed of the format cylinder drives is higher than the web speed, shorter formats are printed.
  • Part of the invention is that the printing substrate web is no longer impressed with any changed web tensions, as was the case in the prior art. This is achieved, for example, in that the printing substrate web is now moved with a constant tensile force. In other words, the web tensions of the substrate web remain unaffected.
  • the method according to the invention makes it possible for the first time to comprehensively adjust the printing length in the case of rigid materials such as paper or metal films.
  • the measurement of the printing length is carried out before the printing substrate web reaches the printing roller.
  • the circumferential speed of the printing roller can even be set individually for each of these printing motifs in the case of existing print motifs on the back.
  • the appropriate point in time at which the peripheral speed of the printing roller is to be changed in order to change the printing lengths appropriately can be used.
  • a measured print length and the consequently changed print length of the print roller form a new target print length with which the print lengths of the subsequent print motifs are compared.
  • the printing of a web of printing material is provided within a multicolor rotary printing machine.
  • the problem arises that the circumferential speeds of the individual printing rollers are changed in such a way that the individual, multicolored print motifs are printed in correct register in order to avoid waste.
  • a preferred solution to this problem is in WO 2014/020083 A2 disclosed.
  • the single figure shows a side view of a printing press according to the invention.
  • This printing press 1 includes a printing unit 2 which has a central impression cylinder 3.
  • the impression cylinder 3 is rotatably mounted in a machine frame, not shown.
  • Consoles which represent the supports for the inking units 4 are also not shown.
  • the inking units 4 only the printing rollers 5 and the inking rollers, for example anilox rollers 6, are shown.
  • the printing substrate web 7 is made available in the printing machine on a reel 8 which is rotatably clamped in an unwinding station 9.
  • the unwound printing material web 7 is guided over several guide rollers 10 from the unwinding station 9 to the pressure roller 11, with which the printing material web 7 can be applied to the impression cylinder.
  • the web path between the unwinding station 9 and the pressure roller is viewed as the feed path 12 of the printing substrate web 7.
  • the web of printing material 7 After the web of printing material 7 has passed through the printing unit 2, it is fed to the drying box 15. There it is guided past dryers (not shown) and / or other devices which serve to harden the printing ink via numerous guide rollers 18. After leaving the drying box, the web 7 is fed to the winding station 16, where it is further processed into a roll 17. The web 7 is always guided between the printing unit 2 and the winding station 16 in such a way that its unprinted side rests on the guide rollers 18.
  • measurements are now made with a sensor, for example a register sensor.
  • the print length is determined - preferably for each print motif.
  • This measured value is transmitted to the computing and control unit 22 via the data line 21.
  • the computing and control unit 22 now compares the measured print length with a target print length, which preferably corresponds to the previously measured print length. If the measured print length deviates from the target print length, the computing and control unit sends control commands via the control line 23 to the drive M of the printing roller 5 The control command or commands lead to a change in the peripheral speed of the printing roller 5, which depends on the size of the deviation described above.
  • the print length resulting from the newly set circumferential speed is now stored as the new set print length in the computing and control unit 22.
  • a further change in the circumferential speed of the printing roller 5 can now be omitted if the measured printing length corresponds to this target value.
  • the Adjustment of the further printing rollers 5, which follow the printing material web 7 in the transport direction T of the first printing roller, is preferably carried out according to the WO 2014/020083 A2 disclosed method.
  • the Figure 2 shows a further embodiment of the invention which is no longer covered by the claims.
  • the sensor 20 is now arranged behind the inking units 4 in the transport direction of the printing substrate web 7. This means that the printing substrate web 7 has already been printed. However, it is not necessary that the sensor is also arranged behind the drying box 15. Rather, it can also be provided in front of the drying box 15.
  • the sensor 20 now monitors the printing length of the printing substrate web 7 printed in the printing press 1 and compares this with a value for the target printing length, which can be specified for the computing and control unit. This target printing length can be the circumference of the printing rollers 5 directly.
  • the computing and control device sends a control command to the motor M of the print roller 5 in order to change the peripheral speed.
  • the target print length is preferably not changed. In this way it is possible to always obtain the same printing length even in the case of web tension variations within the printing substrate web 7.

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

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Bedrucken einer Bedruckstoffbahn innerhalb einer Rotationsdruckmaschine.The invention relates to a method and a device for printing a web of printing material within a rotary printing press.

Rotationsdruckmaschinen, bei denen ein Druckmotiv sich wiederholend auf einer Bedruckstoffbahn aufgetragen wird, werden Druckmotive von einer Druckwalze aufgetragen. Die Bedruckstoffbahn läuft dabei auf einem Gegendruckzylinder. Die Umfangsgeschwindigkeiten der Druckwalze und des Gegendruckzylinders sind dabei gleich.Rotary printing machines, in which a print motif is repeatedly applied to a substrate web, print motifs are applied by a printing roller. The web of printing material runs on an impression cylinder. The peripheral speeds of the printing roller and the impression cylinder are the same.

Problematisch ist allerdings, dass innerhalb der Bedruckstoffbahn die Bahnspannungen deutlich unterschiedlich sein können. Das kann dazu führen, dass die Drucklängen auf der fertig bedruckten Bedruckstoffbahn ebenfalls unterschiedlich sind, was oft bei der Weiterverarbeitung solcher bedruckten Bahnen zu Nachteilen führt. Unter Drucklänge versteht man den Abstand zweier gleicher Punkte innerhalb zweier aufeinander folgenden Druckmotiven. Dies können beispielsweise die Registerpunkte sein.The problem, however, is that the web tensions can be significantly different within the printing substrate web. This can mean that the printing lengths on the finished printed substrate web are also different, which often leads to disadvantages in the further processing of such printed webs. Print length is the distance between two identical points within two consecutive print motifs. These can be the register points, for example.

Soll beispielsweise in einem zweiten Druckvorgang die Rückseite einer bereits bedruckten Bedruckstoffbahn ebenfalls bedruckt werden, so darf es bei dem Druckmotiv auf der Vorderseite im Vergleich mit dem Druckmotiv auf der Rückseite keine Abweichung hinsichtlich der Drucklänge geben.If, for example, the back of an already printed web of printing material is also to be printed in a second printing process, there must be no discrepancy in terms of print length in the print motif on the front compared to the print motif on the back.

Nach dem Stand der Technik wird die Lage des Drucks auf der abwickelten Materialbahn durch Korrektur der Bahnspannung mittels bahnzuggeregelten Vorzugs vor der Druckwalze in der Form korrigiert, dass die Bedruckstoffbahn auf eine konstante Drucklänge gedehnt wird, indem, abhängig von der gemessenen Drucklänge, das Material mit einer höheren bzw. niedrigeren Bahnspannung in seiner Dehnung beeinflusst wird, um der Druckwalze eine Bedruckstoffbahn zuführen zu können, die sowohl über eine konstante Rapportlänge verfügt, die der Drucklänge des neuen Drucks entspricht als auch der Lage des neuen Drucks.According to the state of the art, the position of the print on the unwound material web is corrected by correcting the web tension by means of a web tension-controlled feeder in front of the printing roller in such a way that the print material web is stretched to a constant print length by, depending on the measured print length, the material with a higher or lower web tension is influenced in its elongation in order to be able to feed a printing material web to the printing roller, which has both a constant repeat length that corresponds to the print length of the new print and the position of the new print.

Die US 3 559 568 beschreibt ein Verfahren zum Anpassen der Drucklänge an eine Solldrucklänge, wobei die gedruckte Drucklänge vermessen wird und bei einer Abweichung die gedruckte Drucklänge angepasst wird, um die Abweichung zu verringern. Die Messung erfolgt also hinter dem Druckwerk und wird nicht mit einem bereits rückseitig verdrucktem Motiv abgeglichen.The U.S. 3,559,568 describes a method for adapting the print length to a target print length, the printed print length being measured and, in the event of a deviation, the printed print length being adapted in order to reduce the deviation. The measurement therefore takes place behind the printing unit and is not compared with a motif that has already been printed on the back.

Die US 2006/0016359 A1 befasst sich mit dem Problem, dass eine bedruckte Rolle bei der Lagerung eine tatsächliche Länge verändert. Diese Veränderungen werden modelliert und entsprechend diesem Modell die Drucklänge variiert. Die Drucklängen werden auch gemessen und mit der Solldrucklänge verglichen. Die Drucklänge wird folglich anhand des Vorhersagemodells angepasst.The US 2006/0016359 A1 deals with the problem that a printed roll changes an actual length during storage. These changes are modeled and the print length is varied according to this model. The print lengths are also measured and compared to the target print length. The print length is therefore adjusted based on the predictive model.

Die DE 195 47 074 A1 beschäftigt sich mit dem Bedrucken eines schlauchförmigen Verpackungsmittel. Um eine Registerhaltigkeit bei dem Bedrucken der Rückseite zu erreichen werden Markierungen mit einer nicht sichtbaren UV-Tinte aufgedruckt, die zur Einstellung des Registers dienen. Es sind also Registermarkierungen notwendig. Somit offenbart die DE 195 47 074 A1 ein Verfahren gemäß dem Oberbegriff des Anspruchs 1 sowie eine entsprechende Druckmaschine zum Durchführen desselben.The DE 195 47 074 A1 deals with the printing of a tubular packaging material. In order to achieve register accuracy when printing the back, markings are printed with a non-visible UV ink, which are used to adjust the register. Register marks are therefore necessary. Thus, the DE 195 47 074 A1 a method according to the preamble of claim 1 and a corresponding printing machine for performing the same.

Die Nachteile dieser Verfahren liegen darin, dass der Einfluss auf die Korrektur der Rapportlänge durch Veränderung der Bahnspannung begrenzt ist. Die Bahnspannung darf nicht beliebig niedrig werden, um eine Verkürzung der Rapportlänge zu erzielen, da immer eine Mindestbahnspannung erforderlich ist, um die Materialbahn sicher durch die Maschine zu fahren. Die Bahnspannung darf nicht beliebig hoch werden, um eine Verlängerung der Rapportfänge zu erzielen, da zu hohe Bahnzüge den Bedruckstoff dauerhaft verändern können, indem es zu einer dauerhaften plastischen Verformung kommt, falls die materialtypische Streckgrenze überschritten wird.The disadvantages of this method are that the influence on the correction of the repeat length is limited by changing the web tension. The web tension must not be arbitrarily low in order to shorten the repeat length, as a minimum web tension is always required. to drive the material web safely through the machine. The web tension must not be arbitrarily high in order to achieve an extension of the repeat catch, since web tension that is too high can permanently change the printing material by causing permanent plastic deformation if the material-typical yield point is exceeded.

Weiterhin sind die bisher bekannten Verfahren nur dazu geeignet, mit grundsätzlich dehnfähigen Bedruckstoffen wie beispielsweise Kunststofffolien betrieben zu werden. Für starre Materialien, wie beispielsweise Papier und Alufolie, sind diese nicht sinnvoll einzusetzen, da kaum ein Einfluss durch Variation der Bahnspannung vor dem Druck auf Rapportlänge und Lage des abgewickelten Materials zu erzielen ist.Furthermore, the previously known methods are only suitable for being operated with generally stretchable printing materials such as, for example, plastic films. For rigid materials such as paper and aluminum foil, these are not sensible to use, since there is hardly any influence on the repeat length and position of the unwound material by varying the web tension before printing.

Die Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren und eine Vorrichtung zum Bedrucken einer Bedruckstoffbahn innerhalb einer Rotationsdruckmaschine vorzuschlagen, mit welchen die oben beschriebenen Nachteile vermieden werden können.The object of the present invention is therefore to propose a method and a device for printing a printing material web within a rotary printing press, with which the disadvantages described above can be avoided.

Erfindungsgemäß wird diese Aufgabe durch sämtliche Merkmale des Anspruchs 1 gelöst. In den abhängigen Ansprüchen sind mögliche Ausgestaltungen der Erfindung angegeben.According to the invention, this object is achieved by all the features of claim 1. Possible embodiments of the invention are specified in the dependent claims.

Gemäß der vorliegenden Erfindung ist vorgesehen, dass mit wenigstens einer Druckwalze ein Druckmotiv auf den Bedruckstoff aufgetragen wird, wobei die Druckwalze mit einer Umfangsgeschwindigkeit rotiert, wobei mittels wenigstens einer innerhalb der Rotationsdruckmaschine angeordnete Messeinrichtung eine Drucklänge gemessen wird und wobei die Umfangsgeschwindigkeit der wenigstens einen Druckwalze verändert wird, wenn die gemessene Drucklänge von einer Solldrucklänge abweicht.According to the present invention, it is provided that a print motif is applied to the printing material with at least one printing roller, the printing roller rotating at a peripheral speed, a printing length being measured by means of at least one measuring device arranged within the rotary printing machine and the peripheral speed of the at least one printing roller being changed if the measured print length deviates from a target print length.

Der Kerngedanke der Erfindung ist also, die Drucklänge auf dem Bedruckstoff zu messen und dazu passend die Umfangsgeschwindigkeit der Druckwalze zu verändern, wenn diese gemessene Drucklänge von einer Solldrucklänge abweicht. Durch eine Änderung der Umfangsgeschwindigkeit der Druckwalze kann nun die Drucklänge geändert werden, wobei in diesem Fall die Umfangsgeschwindigkeit des Gegendruckzylinders nicht oder zumindest nicht in gleichem Maße geändert wird. Es kann also zu unterschiedlichen Umfangsgeschwindigkeiten der Druckwalze und des Gegendruckzylinders kommen. Hierbei gilt der Zusammenhang, dass bei geringerer Geschwindigkeit der Formatzylinderantriebe als der Bahngeschwindigkeit längere Formate gedruckt werden und bei größerer Geschwindigkeit der Formatzylinderantriebe als der Bahngeschwindigkeit kürzere Formate gedruckt werden.The core idea of the invention is therefore to measure the printing length on the printing material and to change the circumferential speed of the printing roller to match if this measured printing length deviates from a target printing length. By changing the circumferential speed of the printing roller, the printing length can now be changed, in which case the circumferential speed of the impression cylinder is not changed or at least not changed to the same extent. So it can come to different circumferential speeds of the printing roller and the impression cylinder. The relationship here is that if the speed of the format cylinder drives is lower than the web speed, longer formats are printed and if the speed of the format cylinder drives is higher than the web speed, shorter formats are printed.

Betandteil der Erfindung ist es, dass der Bedruckstoffbahn nunmehr keine veränderten Bahnspannungen mehr aufgeprägt werden, wie es im Stand der Technik der Fall war. Dies wird beispielsweise dadurch erreicht, dass die Bedruckstoffbahn nunmehr mit konstanter Zugkraft bewegt wird. Mit anderen Worten bleiben die Bahnspannungen der Bedruckstoffbahn unbeeinflusst. Das erfindungsgemäße Verfahren ermöglicht überhaupt erst die umfassende Anpassung der Drucklänge bei dehnungssteifen Materialien wie Papier oder Metallfolien.Part of the invention is that the printing substrate web is no longer impressed with any changed web tensions, as was the case in the prior art. This is achieved, for example, in that the printing substrate web is now moved with a constant tensile force. In other words, the web tensions of the substrate web remain unaffected. The method according to the invention makes it possible for the first time to comprehensively adjust the printing length in the case of rigid materials such as paper or metal films.

Weiterhin ist erfindungsgemäß vorgesehen, dass die Messung der Drucklänge durchgeführt wird, bevor die Bedruckstoffbahn die Druckwalze erreicht. In diesem Fall kann die Umfangsgeschwindigkeit der Druckwalze im Fall von vorhandenen Druckmotiven auf der Rückseite sogar für jedes dieser Druckmotive individuell eingestellt werden. In Abhängigkeit vom Abstand der Messeinrichtung zur Druckwalze entlang des Bahnweges der Bedruckstoffbahn kann hierfür der passende Zeitpunkt, an dem die Umfangsgeschwindigkeit der Druckwalze zu verändern ist, um die Drucklängen passend zu verändern.Furthermore, it is provided according to the invention that the measurement of the printing length is carried out before the printing substrate web reaches the printing roller. In this case, the circumferential speed of the printing roller can even be set individually for each of these printing motifs in the case of existing print motifs on the back. Depending on the distance between the measuring device and the printing roller along the path of the printing substrate web, the appropriate point in time at which the peripheral speed of the printing roller is to be changed in order to change the printing lengths appropriately can be used.

Eine gemessene Drucklänge und die in der Folge veränderte Drucklänge der Druckwalze bilden eine neue Solldrucklänge, mit der die Drucklängen der nachfolgenden Druckmotive verglichen werden.A measured print length and the consequently changed print length of the print roller form a new target print length with which the print lengths of the subsequent print motifs are compared.

In einer Weiterbildung der Erfindung ist das Bedrucken einer Bedruckstoffbahn innerhalb einer Mehrfarbenrotationsdruckmaschine vorgesehen. Dabei ergibt sich das Problem, dass die einzelnen Druckwalzen derart in ihren Umfangsgeschwindigkeiten verändert werden, dass die einzelnen, mehrfarbigen Druckmotive registergerecht gedruckt werden, um Makulatur zu vermeiden. Eine bevorzugte Lösung dieses Problems ist in der WO 2014/020083 A2 offenbart.In a further development of the invention, the printing of a web of printing material is provided within a multicolor rotary printing machine. The problem arises that the circumferential speeds of the individual printing rollers are changed in such a way that the individual, multicolored print motifs are printed in correct register in order to avoid waste. A preferred solution to this problem is in WO 2014/020083 A2 disclosed.

Erfindungsgemäß wird diese Aufgabe auch durch eine Druckmaschine gemäß Anspruch 5 gelöst, wobei die gleichen Vorteile gegeben sind, wie sie im Zusammenhang mit Anspruch 1 beschrieben wurden.According to the invention, this object is also achieved by a printing press according to claim 5, the same advantages being given as were described in connection with claim 1.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung gehen aus der nachfolgenden Beschreibung hervor, in der unter Bezugnahme auf die Figuren verschiedene Ausführungsbeispiele im Einzelnen erläutert sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder beliebige Kombinationen erwähnter Merkmale erfindungswesentlich sein. Im Rahmen der gesamten Offenbarung gelten Merkmale und Einzelheiten, die im Zusammenhang mit dem erfindungsgemäßen Verfahren beschrieben sind, selbstverständlich auch im Zusammenhang mit der erfindungsgemäßen Vorrichtung und jeweils umgekehrt, so dass bezüglich der Offenbarung zu den einzelnen Aspekten der Erfindung stets wechselseitig Bezug genommen wird beziehungsweise werden kann. Die einzelnen Figuren zeigen:

Fig. 1
Seitenansicht einer erfindungsgemäßen Druckmaschine, mit welcher das erfindungsgemäße Verfahren durchführbar ist.
Fig. 2
Seitenansicht einer Druckmaschine gemäß einer Ausgestaltung der Erfindung, die nicht mehr von den Ansprüchen gedeckt wird.
Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are explained in detail with reference to the figures. The features mentioned in the claims and in the description can be essential to the invention individually or in any combination of the features mentioned. In the context of the entire disclosure, features and details that are described in connection with the method according to the invention naturally also apply in connection with the device according to the invention and in each case vice versa, so that with regard to the disclosure the individual aspects of the invention are always referred to alternately can. The individual figures show:
Fig. 1
Side view of a printing press according to the invention with which the method according to the invention can be carried out.
Fig. 2
Side view of a printing machine according to an embodiment of the invention which is no longer covered by the claims.

Die einzige Figur zeigt eine Seitenansicht einer erfindungsgemäßen Druckmaschine. Diese Druckmaschine 1 umfasst ein Druckwerk 2, welches einen zentralen Gegendruckzylinder 3 aufweist. Der Gegendruckzylinder 3 ist in einem nicht gezeigten Maschinengestell drehbar gelagert. Ebenfalls nicht gezeigt sind Konsolen, die die Träger für die Farbwerke 4 darstellen. Von der Farbwerken 4 sind nur die Druckwalzen 5 und die Farbauftragswalzen, beispielsweise Rasterwalzen 6, gezeigt.The single figure shows a side view of a printing press according to the invention. This printing press 1 includes a printing unit 2 which has a central impression cylinder 3. The impression cylinder 3 is rotatably mounted in a machine frame, not shown. Consoles which represent the supports for the inking units 4 are also not shown. Of the inking units 4, only the printing rollers 5 and the inking rollers, for example anilox rollers 6, are shown.

Die Bedruckstoffbahn 7 wird in der Druckmaschine auf einem Wickel 8 zur Verfügung gestellt, die in einer Abwickelstation 9 drehbar eingespannt ist. Die abgewickelte Bedruckstoffbahn 7 wird über mehrere Leitwalzen 10 von der Abwickelstation 9 bis zur Anpresswalze 11 geführt, mit welcher die Bedruckstoffbahn 7 auf den Gegendruckzylinder aufbringbar ist. Der Bahnweg zwischen der Abwickelstation 9 und der Anpresswalze wird als Zuführweg 12 der Bedruckstoffbahn 7 angesehen.The printing substrate web 7 is made available in the printing machine on a reel 8 which is rotatably clamped in an unwinding station 9. The unwound printing material web 7 is guided over several guide rollers 10 from the unwinding station 9 to the pressure roller 11, with which the printing material web 7 can be applied to the impression cylinder. The web path between the unwinding station 9 and the pressure roller is viewed as the feed path 12 of the printing substrate web 7.

Nachdem die Bedruckstoffbahn 7 das Druckwerk 2 durchlaufen hat, wird sie dem Trockenkasten 15 zugeführt. Dort wird sie über zahlreiche Leitwalzen 18 an nicht dargestellten Trocknern und/oder anderen Einrichtungen, die dem Aushärten der Druckfarbe dienen, vorbeigeführt. Nach dem Verlassen des Trockenkastens wird die Bahn 7 der Aufwickelstation 16 zugeführt, wo sie zu einem Wickel 17 weiter verarbeitet wird. Die Bahn 7 wird zwischen dem Druckwerk 2 und der Wickelstation 16 stets so geführt, dass sie mit der unbedruckten Seite auf den Leitwalzen 18 aufliegt.After the web of printing material 7 has passed through the printing unit 2, it is fed to the drying box 15. There it is guided past dryers (not shown) and / or other devices which serve to harden the printing ink via numerous guide rollers 18. After leaving the drying box, the web 7 is fed to the winding station 16, where it is further processed into a roll 17. The web 7 is always guided between the printing unit 2 and the winding station 16 in such a way that its unprinted side rests on the guide rollers 18.

Bei einer bereits rückseitig bedruckten Bedruckstoffbahn 7 wird nun mit einem Sensor, etwa einem Registersensor, vermessen. Dabei wird - vorzugsweise bei jedem Druckmotiv - die Drucklänge bestimmt. Dieser Messwert wird der Rechen- und Steuereinheit 22 über die Datenleitung 21 übermittelt. Die Rechen- und Steuereinheit 22 vergleicht nun die gemessene Drucklänge mit einer Solldrucklänge, welcher vorzugsweise der zuvor gemessenen Drucklänge entspricht. Weicht die gemessene Drucklänge von der Solldrucklänge ab, so sendet die Rechen- und Steuereinheit Steuerbefehle über die Steuerleitung 23 an den Antrieb M der Druckwalze 5. Exemplarisch ist dieser Sachverhalt nur für das erste Farbwerk 4 dargestellt, jedoch gilt dies auch für die weiteren Farbwerke 4. Der Steuerbefehl oder die Steuerbefehle führen zu einer Veränderung der Umfangsgeschwindigkeit der Druckwalze 5, der von der Größe der zuvor beschriebenen Abweichung abhängt. Die sich durch die neu eingestellte Umfangsgeschwindigkeit ergebende Drucklänge wird nun als neue Solldrucklänge in der Rechen- und Steuereinheit 22 gespeichert. Eine weitere Änderung der Umfangsgeschwindigkeit der Druckwalze 5 kann nun entfallen, wenn die gemessene Drucklänge diesem Sollwert entspricht. Die Einstellung der weiteren Druckwalzen 5, die in Transportrichtung T der Bedruckstoffbahn 7 der ersten Druckwalze folgen, erfolgt vorzugsweise nach dem in der WO 2014/020083 A2 offenbarten Verfahren.In the case of a printing substrate web 7 already printed on the back, measurements are now made with a sensor, for example a register sensor. The print length is determined - preferably for each print motif. This measured value is transmitted to the computing and control unit 22 via the data line 21. The computing and control unit 22 now compares the measured print length with a target print length, which preferably corresponds to the previously measured print length. If the measured print length deviates from the target print length, the computing and control unit sends control commands via the control line 23 to the drive M of the printing roller 5 The control command or commands lead to a change in the peripheral speed of the printing roller 5, which depends on the size of the deviation described above. The print length resulting from the newly set circumferential speed is now stored as the new set print length in the computing and control unit 22. A further change in the circumferential speed of the printing roller 5 can now be omitted if the measured printing length corresponds to this target value. The Adjustment of the further printing rollers 5, which follow the printing material web 7 in the transport direction T of the first printing roller, is preferably carried out according to the WO 2014/020083 A2 disclosed method.

Die Figur 2 zeigt nun eine weitere Ausführungsform der Erfindung, die nicht mehr von den Ansprüchen gedeckt wird. Im Vergleich mit der Ausführungsform der Figur 1 ist nun jedoch der Sensor 20 in Transportrichtung der Bedruckstoffbahn 7 hinter den Farbwerken 4 angeordnet. Das bedeutet, dass die Bedruckstoffbahn 7 bereits bedruckt ist. Hingegen ist es nicht notwendig, dass der Sensor auch hinter dem Trockenkasten 15 angeordnet ist. Vielmehr kann sie auch vor dem Trockenkasten 15 vorgesehen werden. Der Sensor 20 überwacht nun bei der in der Druckmaschine 1 bedruckten Bedruckstoffbahn 7 die Drucklänge und vergleicht diese mit einem Wert für die Solldrucklänge, der der Rechen- und Steuereinheit vorgebbar ist. Diese Solldrucklänge kann direkt der Umfang der Druckwalzen 5 sein. Wird jedoch nun bei der Messung eine von dieser Solldrucklänge abweichende Drucklänge festgestellt, so sendet die die Rechen- und Steuereinrichtung einen Steuerbefehl an den Motor M der Druckwalze 5, um die Umfangsgeschwindigkeit zu verändern. In diesem Ausführungsbeispiel wird die Solldrucklänge jedoch vorzugsweise nicht verändert. Auf diese Weise ist es möglich, auch bei Bahnspannungsvariationen innerhalb der Bedruckstoffbahn 7 stets die gleiche Drucklänge zu erhalten. Bezugszeichenliste 1 Druckmaschine 2 Druckwerk 3 Gegendruckzylinder 4 Farbwerk 5 Druckwalze 6 Rasterwalze 7 Bedruckstoffbahn 8 Wickel 9 Abwickelstation 10 Leitwalze 11 Anpresswalze 12 Zuführweg 13 14 15 Trockenkasten 16 Aufwickelstation 17 Wickel 18 Leitwalze 19 20 Sensor; Messeinrichtung 21 Datenleitung 22 Rechen- und Steuereinrichtung 23 Steuerleitung M Motor T Transportrichtung der Bahn 7 The Figure 2 shows a further embodiment of the invention which is no longer covered by the claims. In comparison with the embodiment of Figure 1 However, the sensor 20 is now arranged behind the inking units 4 in the transport direction of the printing substrate web 7. This means that the printing substrate web 7 has already been printed. However, it is not necessary that the sensor is also arranged behind the drying box 15. Rather, it can also be provided in front of the drying box 15. The sensor 20 now monitors the printing length of the printing substrate web 7 printed in the printing press 1 and compares this with a value for the target printing length, which can be specified for the computing and control unit. This target printing length can be the circumference of the printing rollers 5 directly. If, however, a print length deviating from this setpoint print length is found during the measurement, the computing and control device sends a control command to the motor M of the print roller 5 in order to change the peripheral speed. In this exemplary embodiment, however, the target print length is preferably not changed. In this way it is possible to always obtain the same printing length even in the case of web tension variations within the printing substrate web 7. List of reference symbols 1 Printing press 2 Printing unit 3 Impression cylinder 4th Inking unit 5 Pressure roller 6th Anilox roller 7th Substrate web 8th Wrap 9 Unwinding station 10 Guide roller 11 Pressure roller 12 Feed path 13 14th 15th Dry box 16 Winding station 17th Wrap 18th Guide roller 19th 20th Sensor; Measuring device 21st Data line 22nd Computing and control device 23 Control line M. engine T Direction of transport of the web 7

Claims (5)

  1. A method for printing a printing substrate web (7) within a rotary printing press (1),
    wherein
    • a print motif is applied on the printing substrate web (7) with at least one printing roller (5), wherein the printing roller (5) rotates with a peripheral speed,
    • a printing length is measured by means of at least one measuring device (20) arranged within the rotary printing press (1), and
    wherein the measurement of the printing length is carried out before the printing substrate web (7) reaches the printing roller (5), wherein the printing length of a print motif already located on the rear side of the printing substrate web (7) is measured with the measuring device (20),
    characterized in that the peripheral speed of the at least one printing roller (5) is changed, if the measured printing length deviates from a desired printing length, wherein the web tensions of the printing substrate web (7) remain unaffected.
  2. The method according to the preceding claim,
    characterized in that
    the peripheral speed of the printing roller (5) is set so that printing takes place with the measured printing length.
  3. The method according to any one of the preceding claims,
    characterized in that
    the measured printing length, to which the printing speed of the printing roller (5) is set, is stored as the desired printing length.
  4. The method according to any one of the preceding claims,
    characterized in that
    the appropriate point in time, at which the peripheral speed of the printing roller (5) is changed, is determined as a function of the distance of the measuring device (20) from the printing roller (5) along the web path of the printing substrate web (7).
  5. A printing press (1) for printing a printing substrate web (7), wherein the printing press (1) is provided and configured to implement the method according to any one of claims 1 to 4.
EP17719569.0A 2016-05-11 2017-04-25 Method and device for printing a web-like printing substrate within a rotary printing press Active EP3455073B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016208132 2016-05-11
PCT/EP2017/059717 WO2017194299A1 (en) 2016-05-11 2017-04-25 Method and device for printing a print stock web within a rotary printing press

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EP3455073A1 EP3455073A1 (en) 2019-03-20
EP3455073B1 true EP3455073B1 (en) 2021-02-24

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EP (1) EP3455073B1 (en)
ES (1) ES2864766T3 (en)
WO (1) WO2017194299A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102021118031A1 (en) * 2021-07-13 2023-01-19 Koenig & Bauer Ag Processing machine and method for setting a processing length of a shaping unit of a processing machine
CN114523756A (en) * 2022-02-09 2022-05-24 福建琦峰科技有限公司 Printing pattern length control method meeting color register stability

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Publication number Priority date Publication date Assignee Title
US3559568A (en) * 1969-01-14 1971-02-02 Armstrong Cork Co Method of controlling pattern repeat length
US7584699B2 (en) * 2004-07-10 2009-09-08 Clopay Plastic Products Company, Inc. Method for correcting print repeat length variability in printed extensible materials and product

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Also Published As

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ES2864766T3 (en) 2021-10-14
EP3455073A1 (en) 2019-03-20
WO2017194299A1 (en) 2017-11-16

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