EP0778129B1 - Digital printing machine and method for its conveying of sheets - Google Patents

Digital printing machine and method for its conveying of sheets Download PDF

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Publication number
EP0778129B1
EP0778129B1 EP96119438A EP96119438A EP0778129B1 EP 0778129 B1 EP0778129 B1 EP 0778129B1 EP 96119438 A EP96119438 A EP 96119438A EP 96119438 A EP96119438 A EP 96119438A EP 0778129 B1 EP0778129 B1 EP 0778129B1
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EP
European Patent Office
Prior art keywords
conveyor belt
substrates
cylinder
printing machine
printing
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EP96119438A
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German (de)
French (fr)
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EP0778129A1 (en
Inventor
Anton Rodi
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RODI, ANTON
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Individual
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F21/00Devices for conveying sheets through printing apparatus or machines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41PINDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/70Forming the printing surface directly on the form cylinder

Definitions

  • the invention relates to a digital printing machine and a Process for sheet transport using an endless Conveyor belt on one or more digital printing units past.
  • a digital printing press contains one or more Printing units in which one by electrical signals controllable write head on a movable Intermediate carrier creates latent images that the electrical Signals.
  • the latent images Charge distributions of electrons or ions on the Be intermediate carrier.
  • the latent images are marked by a Inking unit developed by according to the charge distribution Printing ink is applied to the intermediate carrier. Then the ink is either immediately from the Intermediate carrier or one or more others Transfer intermediate carrier to substrates to be printed, for example Sheets of paper.
  • Rotating cylinders or around are used as intermediate carriers rotating cylinder revolving belts.
  • the ones to be printed Sheets are made on the intermediate beam or on the last one a series of intermediate carriers connected in series transported past, the color z. B. by more or less strong pressure is transferred to the arches.
  • the required transfer pressure can e.g. B. by Impression cylinders are applied on the side of the Conveyor belt are arranged opposite the sheets so that the conveyor belt and thus the sheets against the Intermediate carrier of the printing unit can be pressed.
  • a conveyor belt can be used for this purpose use an insulating material that is electrically charged will to the arches by electrostatic attraction to be held on the conveyor belt.
  • relatively strong holding forces are required to To prevent sheet detachment with certainty. So strong Generating holding forces is not only complex, but also also complicates the separation of the sheets from the conveyor belt for delivery to a boom stack after the Printing units have passed.
  • the invention has for its object the arches with only low holding forces reliably on the conveyor belt hold when they pass an intermediate carrier, of which the Ink is transferred to the sheets.
  • the arches are not whole Leading edge at once in the pressure gap between one Cylinder and the conveyor belt run in, as with Printing presses is common, but in one Tilt to the cylinder. This is located along only a small section of the arc width The leading edge of the sheet in a critical area in which the There is a risk of detachment. Therefore, it may be sufficient the inherent rigidity of the arches in connection with their interface liability on the conveyor belt so they the pressure gap reliably without detaching from the conveyor belt leave.
  • Supplementary can be on the conveyor belt acting holding forces are used with the type of sheet inlet according to the invention in the printing nip cooperate advantageously.
  • the critical one mentioned Area adjacent areas on the arch face a total a much larger area than that in the printing nip area. This makes the areas stand out are currently not in the print nip, even with relative weak holding forces able to narrow the section to restrain the leading edge of the sheet on the conveyor belt, which is currently in the pressure nip.
  • the invention is particularly suitable in connection with electrostatic holding forces that are very simple Generate the way, but proportional to the distance of the Sheet from the conveyor belt. While in this Case with a conventional type of sheet inlet itself a slight sheet detachment is no longer repairable and leads to a malfunction of the printing operation, can with the Partial inlet type according to the invention occurring sheet detachments through the neighboring areas undone.
  • the invention is also in connection with supportive holding forces on the conveyor belt useful, generated in any way other than electrostatic be, e.g. B. by slight negative pressure.
  • the invention has the additional advantage that shocks when the sheets enter or leave the Pressure gap can be avoided.
  • This shock absorption is special effective if the sheets follow each other closely, so that a new sheet is already in the printing nip on one side runs in if the previous sheet still has the printing nip has not left.
  • the invention can be implemented in two alternative ways become. Either the sheets are made in the conventional way an investor on the conveyor belt, namely with their leading edges at right angles to the direction of transport, and the cylinders on which the transfer of the ink are slanted. Or the cylinders in a conventional way perpendicular to the direction of transport ordered, and the investor is set up to Bends in a desired inclination on the Put on the conveyor belt.
  • the printing machine shown in section in FIG. 1 contains a Conveyor belt 1, the one lying on it in a row Bends 2 in the direction of an arrow P from a stack of feeders transported to a boom stack, neither of which are drawn.
  • the sheets 2 can be sheets of paper or any other substrates to be printed, e.g. B. Plastic films.
  • a transfer cylinder 3 is rotatable above the Conveyor belt 1 or the sheets 2 rotatable about an axis 4 stored.
  • An impression cylinder 5 is rotatable below the Conveyor belt 1 stored.
  • the transfer cylinder 3 and the impression cylinder 5 extend in their Axial direction across the printing width of the sheets 2.
  • the conveyor belt 1 has an insulating surface on by a facility not shown is electrically charged so that the sheets 2 during the Adhere to the transport electrostatically. Alternatively or in addition, the arches 2 can be suitably electrically charged become.
  • the latent images are through a schematically drawn inking unit 7 according to the Charge distribution developed by selectively printing on ink the transfer cylinder 3 is applied, and the developed images are then more or less strong pressure on the sheets 2 transferred and by not shown means fixed on it.
  • Angle ⁇ is essential that a Sheet 2 always only a small part of the sheet leading edge 8 in the pressure gap between the transfer cylinder 3 and the Impression cylinder 5 is located.
  • a width of Pressure gap of z. B. 0.5 to 1 mm can be given in a Machine configuration an angle ⁇ of 1 ° or less are enough to achieve this.
  • the write head 6, the z. B. is an elongated array, that extends across the printable sheet width, can parallel to the axis 4 of the transfer cylinder 3rd be arranged.
  • the print head 6 supplied image data according to the inclination of the Transfer cylinder 3 can be changed or influenced.
  • a write head 6 which is a series of at a pixel pitch contains imaging elements arranged side by side, can e.g. B. the data related to imaging elements belong along the circumference of the transfer cylinder 3rd closer to the bow 2, accordingly delayed to the Print head 6 are given.
  • transfer cylinder 3 can also additional transfer cylinders for additional colors at an angle be put.
  • the print heads can also be parallel to the leading edge 8 of the sheet be arranged as in Fig. 2 on another Transfer cylinder 9, for example, by a dashed line shown write head 10 is shown.
  • the image data can the print head 10 without Change can be fed line by line so that the Information in exactly the same way as with one straight lying transfer cylinders are processed.
  • the angle ⁇ is small and the write head 10 of is of a type in which there is no precisely defined distance from the Transfer cylinder 9 must be adhered to Print head 10 not specifically for this arrangement be set up. Otherwise, too Print head constructions conceivable, so to speak "nestle" the transfer cylinder 9.
  • the inking unit 7 can be set to one be arranged in the usual way, d. H. parallel to the axis of the Transfer cylinder 3 or 9.
  • printing units with only one Transfer cylinder 3 or 9 can also print units with several in a row switched transmission cylinders are used for example a cylinder, on the circumference of which Print head and the inking unit are arranged, and one rolling further cylinder on it, which in turn on the Rolls sheets or the conveyor belt.

Description

Die Erfindung betrifft eine digitale Druckmaschine und ein Verfahren zum Bogentransport mittels eines endlosen Transportbandes an einem oder mehreren digitalen Druckwerken vorbei.The invention relates to a digital printing machine and a Process for sheet transport using an endless Conveyor belt on one or more digital printing units past.

Eine digitale Druckmaschine enthält ein oder mehrere Druckwerke, in denen ein durch elektrische Signale ansteuerbarer Schreibkopf auf einem beweglichen Zwischenträger latente Bilder erzeugt, die den elektrischen Signalen entsprechen. Die latenten Bilder können zum Beispiel Ladungsverteilungen von Elektronen oder Ionen auf dem Zwischenträger sein. Die latenten Bilder werden durch ein Farbwerk entwickelt, indem entsprechend der Ladungsverteilung Druckfarbe auf den Zwischenträger aufgebracht wird. Anschließend wird die Druckfarbe entweder unmittelbar von dem Zwischenträger oder über einen oder mehrere weitere Zwischenträger auf zu bedruckende Substrate übertragen, etwa Papierbögen.A digital printing press contains one or more Printing units in which one by electrical signals controllable write head on a movable Intermediate carrier creates latent images that the electrical Signals. For example, the latent images Charge distributions of electrons or ions on the Be intermediate carrier. The latent images are marked by a Inking unit developed by according to the charge distribution Printing ink is applied to the intermediate carrier. Then the ink is either immediately from the Intermediate carrier or one or more others Transfer intermediate carrier to substrates to be printed, for example Sheets of paper.

Als Zwischenträger verwendet man rotierende Zylinder oder um rotierende Zylinder umlaufende Bänder. Die zu bedruckenden Bögen werden an dem Zwischenträger bzw. an dem letzten aus einer Reihe von hintereinander geschalteten Zwischenträgern vorbeitransportiert, wobei die Farbe z. B. durch mehr oder weniger starken Druck auf die Bögen übertragen wird.Rotating cylinders or around are used as intermediate carriers rotating cylinder revolving belts. The ones to be printed Sheets are made on the intermediate beam or on the last one a series of intermediate carriers connected in series transported past, the color z. B. by more or less strong pressure is transferred to the arches.

Für den Transport der Bögen an den Druckwerken vorbei hat man endlose Transportbänder vorgeschlagen, die einen langgestreckten Abschnitt aufweisen, auf dem die Bögen von einem Anlegerstapel zu einem Auslegerstapel transportiert werden. Der erforderliche Übertragungsdruck kann z. B. durch Gegendruckzylinder aufgebracht werden, die auf der Seite des Transportbandes gegenüber den Bögen angeordnet sind, so daß das Transportband und damit die Bögen gegen den Zwischenträger des Druckwerks gedrückt werden.You have to transport the sheets past the printing units endless conveyor belts suggested one have elongated section on which the arches of transported from a feeder stack to a delivery stack become. The required transfer pressure can e.g. B. by Impression cylinders are applied on the side of the Conveyor belt are arranged opposite the sheets so that the conveyor belt and thus the sheets against the Intermediate carrier of the printing unit can be pressed.

Beim Austritt eines Bogens aus dem Druckspalt zwischen dem Transportband und dem Zwischenträger besteht die Gefahr, daß der Bogen am Zwischenträger haften bleibt und sich vom Transportband ablöst. Dies muß unter allen Umständen verhindert werden.When a sheet emerges from the printing gap between the Conveyor belt and the intermediate carrier there is a risk that the bow sticks to the intermediate carrier and moves away from the The conveyor belt comes off. This must be done under all circumstances be prevented.

Zu diesem Zweck kann man beispielsweise ein Transportband aus einem isolierenden Material verwenden, das elektrisch geladen wird, um die Bögen durch elektrostatische Anziehungskräfte auf dem Transportband festzuhalten. Wie sich gezeigt hat, benötigt man jedoch verhältnismäßig starke Haltekräfte, um Bogenablösungen mit Sicherheit zu verhindern. Derart starke Haltekräfte zu erzeugen ist nicht nur aufwendig, sondern erschwert außerdem die Abtrennung der Bögen vom Transportband zur Abgabe an einen Auslegerstapel, nachdem sie die Druckwerke passiert haben.For example, a conveyor belt can be used for this purpose use an insulating material that is electrically charged will to the arches by electrostatic attraction to be held on the conveyor belt. As has been shown however, relatively strong holding forces are required to To prevent sheet detachment with certainty. So strong Generating holding forces is not only complex, but also also complicates the separation of the sheets from the conveyor belt for delivery to a boom stack after the Printing units have passed.

Der Erfindung liegt die Aufgabe zugrunde, die Bögen mit nur geringen Haltekräften zuverlässig auf dem Transportband zu halten, wenn sie einen Zwischenträger passieren, von dem die Druckfarbe auf die Bögen übertragen wird.The invention has for its object the arches with only low holding forces reliably on the conveyor belt hold when they pass an intermediate carrier, of which the Ink is transferred to the sheets.

Diese Aufgabe wird erfindungsgemäß durch eine Druckmaschine nach Anspruch 1 und durch ein Verfahren nach Anspruch 8 gelöst.This object is achieved by a printing press according to claim 1 and by a method according to claim 8 solved.

Gemäß der Erfindung werden die Bögen nicht mit ihrer gesamten Vorderkante auf einmal in den Druckspalt zwischen einem Zylinder und dem Transportband einlaufen gelassen, wie es bei Druckmaschinen allgemein üblich ist, sondern in einer Schrägstellung zu dem Zylinder. Dadurch befindet sich entlang der Bogenbreite immer nur ein kleiner Abschnitt der Bogenvorderkante in einem kritischen Bereich, in dem die Gefahr einer Ablösung besteht. Daher genügt unter Umständen bereits die Eigensteifigkeit der Bögen in Verbindung mit ihrer Grenzflächenhaftung auf dem Transportband, damit sie den Druckspalt zuverlässig ohne Ablösung vom Transportband verlassen.According to the invention, the arches are not whole Leading edge at once in the pressure gap between one Cylinder and the conveyor belt run in, as with Printing presses is common, but in one Tilt to the cylinder. This is located along only a small section of the arc width The leading edge of the sheet in a critical area in which the There is a risk of detachment. Therefore, it may be sufficient the inherent rigidity of the arches in connection with their interface liability on the conveyor belt so they the pressure gap reliably without detaching from the conveyor belt leave.

Unterstützend können zusätzliche, auf dem Transportband wirkende Haltekräfte verwendet werden, die mit der erfindungsgemäßen Art des Bogeneinlaufs in den Druckspalt vorteilhaft zusammenwirken. Die dem erwähnten kritischen Bereich benachbarten Bereiche auf den Bogen weisen insgesamt eine sehr viel größere Fläche als der gerade im Druckspalt befindliche Bereich auf. Dadurch sind die Bereiche, die sich momentan nicht im Druckspalt befinden, auch bei relativ schwachen Haltekräften in der Lage, den schmalen Abschnitt der Bogenvorderkante auf dem Transportband zurückzuhalten, der sich gerade im Druckspalt befindet.Supplementary can be on the conveyor belt acting holding forces are used with the type of sheet inlet according to the invention in the printing nip cooperate advantageously. The critical one mentioned Area adjacent areas on the arch face a total a much larger area than that in the printing nip area. This makes the areas stand out are currently not in the print nip, even with relative weak holding forces able to narrow the section to restrain the leading edge of the sheet on the conveyor belt, which is currently in the pressure nip.

Die Erfindung eignet sich besonders in Verbindung mit elektrostatischen Haltekräften, die sich auf sehr einfache Weise erzeugen lassen, jedoch proportional zum Abstand des Bogens vom Transportband kleiner werden. Während in diesem Fall bei einer herkömmlichen Art des Bogeneinlaufs selbst eine geringfügige Bogenablösung nicht mehr reparabel ist und zu einer Störung des Druckbetriebs führt, können bei der erfindungsgemäßen Art des Bogeneinlaufs etwaige partiell auftretende Bogenablösungen durch die benachbarten Bereiche rückgängig gemacht werden.The invention is particularly suitable in connection with electrostatic holding forces that are very simple Generate the way, but proportional to the distance of the Sheet from the conveyor belt. While in this Case with a conventional type of sheet inlet itself a slight sheet detachment is no longer repairable and leads to a malfunction of the printing operation, can with the Partial inlet type according to the invention occurring sheet detachments through the neighboring areas undone.

Andererseits ist die Erfindung auch in Verbindung mit unterstützenden Haltekräften auf dem Transportband nützlich, die auf irgendeine andere Weise als elektrostatisch erzeugt werden, z. B. durch leichten Unterdruck.On the other hand, the invention is also in connection with supportive holding forces on the conveyor belt useful, generated in any way other than electrostatic be, e.g. B. by slight negative pressure.

Die Erfindung weist den zusätzlichen Vorteil auf, daß Stöße beim Einlauf bzw. Auslauf der Bögen in den bzw. aus dem Druckspalt vermieden werden. Diese Stoßdämpfung ist besonders wirkungsvoll, wenn die Bögen dicht aufeinanderfolgen, so daß auf einer Seite bereits ein neuer Bogen in den Druckspalt einläuft, wenn der vorhergehende Bogen den Druckspalt noch nicht verlassen hat.The invention has the additional advantage that shocks when the sheets enter or leave the Pressure gap can be avoided. This shock absorption is special effective if the sheets follow each other closely, so that a new sheet is already in the printing nip on one side runs in if the previous sheet still has the printing nip has not left.

Die Erfindung kann auf zwei alternative Weisen verwirklicht werden. Entweder werden die Bögen auf herkömmliche Weise von einem Anleger auf das Transportband befördert, nämlich mit ihren Vorderkanten genau rechtwinklig zur Transportrichtung, und die Zylinder, an denen die Übertragung der Druckfarbe stattfindet, werden schräggestellt. Oder die Zylinder werden auf herkömmliche Weise rechtwinklig zur Transportrichtung angeordnet, und der Anleger wird dafür eingerichtet, die Bögen in einer gewünschten Schrägstellung auf das Transportband aufzulegen.The invention can be implemented in two alternative ways become. Either the sheets are made in the conventional way an investor on the conveyor belt, namely with their leading edges at right angles to the direction of transport, and the cylinders on which the transfer of the ink are slanted. Or the cylinders in a conventional way perpendicular to the direction of transport ordered, and the investor is set up to Bends in a desired inclination on the Put on the conveyor belt.

In beiden Fällen wird ausgenutzt, daß digitale Druckmaschinen eine Schreibeinrichtung aufweisen, welche die latenten Bilder anhand von Bilddaten auf einem Zwischenträger erzeugt. Entweder werden die Bilddaten entsprechend der Schrägstellung der Bögen verändert oder beeinflußt, bevor sie der Schreibeinrichtung zugeführt werden, so daß die Bögen anschließend unverzerrt und originalgetreu bedruckt werden, oder die Schreibeinrichtung wird in einem Winkel zu dem Zwischenträger angeordnet, welcher der Schrägstellung der Bögen entspricht.In both cases, use is made of digital printing machines have a writing device which the latent images generated on the basis of image data on an intermediate carrier. Either the image data will be skewed the arches changed or affected before the Writing device are fed so that the sheets then printed undistorted and true to the original, or the writing device is at an angle to that Intermediate carrier arranged, which the inclination of the Arches corresponds.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung mehrerer Ausführungsbeispiele und aus der Zeichnung, auf die Bezug genommen wird. In der Zeichnung zeigen:

Fig. 1
eine Teilansicht einer digitalen Druckmaschine in Längsschnitt;
und
Fig. 2
eine Teilansicht einer digitalen Druckmaschine von oben.
Further features and advantages of the invention result from the following description of several exemplary embodiments and from the drawing, to which reference is made. The drawing shows:
Fig. 1
a partial view of a digital printing machine in longitudinal section;
and
Fig. 2
a partial view of a digital printing machine from above.

Die in Fig. 1 im Schnitt gezeigte Druckmaschine enthält ein Transportband 1, das hintereinander darauf aufliegende Bögen 2 in Richtung eines Pfeils P von einem Anlegerstapel zu einem Auslegerstapel transportiert, die beide nicht eingezeichnet sind. Die Bögen 2 können Papierbögen oder irgendwelche anderen zu bedruckenden Substrate sein, z. B. Folien aus Kunststoff.The printing machine shown in section in FIG. 1 contains a Conveyor belt 1, the one lying on it in a row Bends 2 in the direction of an arrow P from a stack of feeders transported to a boom stack, neither of which are drawn. The sheets 2 can be sheets of paper or any other substrates to be printed, e.g. B. Plastic films.

Ein Übertragungszylinder 3 ist drehbar oberhalb des Transportbandes 1 bzw. der Bögen 2 um eine Achse 4 drehbar gelagert. Ein Gegendruckzylinder 5 ist drehbar unterhalb des Transportbandes 1 gelagert. Der Übertragungszylinder 3 und der Gegendruckzylinder 5 erstrecken sich in ihrer Axialrichtung quer über die Druckbreite der Bögen 2. Der Übertragungszylinder 3 und der Gegendruckzylinder 5 drücken gegeneinander, so daß die Bögen 2 gegen den Gegendruckzylinder 3 gepreßt werden, wenn sie von dem Transportband 1 durch den Druckspalt zwischen dem Übertragungszylinder 3 und dem Gegendruckzylinder 5 befördert werden. Das Transportband 1 weist eine isolierende Oberfläche auf, die durch eine nicht eingezeichnete Einrichtung elektrisch geladen wird, so daß die Bögen 2 während des Transports elektrostatisch daran haften. Alternativ oder zusätzlich können die Bögen 2 geeignet elektrisch geladen werden. A transfer cylinder 3 is rotatable above the Conveyor belt 1 or the sheets 2 rotatable about an axis 4 stored. An impression cylinder 5 is rotatable below the Conveyor belt 1 stored. The transfer cylinder 3 and the impression cylinder 5 extend in their Axial direction across the printing width of the sheets 2. The Press transfer cylinder 3 and impression cylinder 5 against each other, so that the sheets 2 against the Back pressure cylinder 3 are pressed when they are from the Conveyor belt 1 through the pressure gap between the Transfer cylinder 3 and the impression cylinder 5 transported become. The conveyor belt 1 has an insulating surface on by a facility not shown is electrically charged so that the sheets 2 during the Adhere to the transport electrostatically. Alternatively or in addition, the arches 2 can be suitably electrically charged become.

Einem an einer Stelle am Umfang des Übertragungszylinders 1 angeordneten und schematisch eingezeichneten Schreibkopf 6 werden Bilddaten zugeführt, anhand derer der Schreibkopf 6 auf dem Übertragungszylinder 3 latente Bilder erzeugt, z. B. in Form von Ladungsverteilungen, die den gewünschten Druckbildern entsprechen. Die latenten Bilder werden durch ein schematisch eingezeichnetes Farbwerk 7 entsprechend der Ladungsverteilung entwickelt, indem selektiv Druckfarbe auf den Übertragungszylinder 3 aufgebracht wird, und die entwickelten Bilder werden dann durch mehr oder weniger starken Druck auf die Bögen 2 übertragen und durch nicht gezeigte Mittel drauf fixiert.One at a location on the circumference of the transfer cylinder 1 arranged and schematically drawn in writing head 6 image data are supplied, on the basis of which the write head 6 3 latent images are generated on the transfer cylinder, e.g. B. in the form of charge distributions that the desired Correspond to printed images. The latent images are through a schematically drawn inking unit 7 according to the Charge distribution developed by selectively printing on ink the transfer cylinder 3 is applied, and the developed images are then more or less strong pressure on the sheets 2 transferred and by not shown means fixed on it.

Beim Austritt einer Bogenvorderkante 8 aus dem Druckspalt zwischen dem Übertragungszylinder 3 und dem Gegendruckzylinder 5 besteht die Gefahr, daß sich die Bogenvorderkante 8 trotz der elektrostatischen Haltekraft vom Transportband 1 ablöst und am Übertragungszylinder 3 haften bleibt, wie gestrichelt eingezeichnet.When a sheet leading edge 8 emerges from the printing nip between the transfer cylinder 3 and the Impression cylinder 5 there is a risk that the Front edge 8 despite the electrostatic holding force from Belt 1 detaches and adhere to transfer cylinder 3 remains as shown in dashed lines.

Dieses wird dadurch vermieden, daß der Übertragungszylinder 3 (und entsprechend der Gegendruckzylinder 5) nicht rechtwinklig zur Transportrichtung P an der Druckmaschine gelagert ist, sondern schräg dazu, wie in der Draufsicht von Fig. 2 zu sehen ist. Da die Bögen 2 rechtwinklig auf dem Transportband 1 aufliegen, d. h. mit ihrer Vorderkante 8 senkrecht zur Transportrichtung P, bildet die Achse 4 des Übertragungszylinders 3 einen kleinen Winkel α mit der Bogenvorderkante 8. Während in Fig. 2 zur Verdeutlichung ein Winkel α von ca. 10° eingezeichnet ist, kann dieser in der Praxis auch wesentlich kleiner sein. Für die Bemessung des Winkels α ist wesentlich, daß sich beim Einlauf eines Bogens 2 immer nur ein kleiner Teil der Bogenvorderkante 8 in dem Druckspalt zwischen dem Übertragungszylinder 3 und dem Gegendruckzylinder 5 befindet. Bei einer Breite des Druckspalts von z. B. 0,5 bis 1 mm kann in einer gegebenen Maschinenkonfiguration ein Winkel α von 1° oder weniger genügen, um dieses zu erreichen.This is avoided in that the transfer cylinder 3rd (and according to the impression cylinder 5) not perpendicular to the transport direction P on the printing press is stored, but at an angle to it, as in the top view of Fig. 2 can be seen. Since the arches 2 are perpendicular to the Lie on conveyor belt 1, d. H. with its front edge 8 perpendicular to the direction of transport P, forms the axis 4 of the Transfer cylinder 3 a small angle α with the Front sheet edge 8. While in Fig. 2 for clarification Angle α of approximately 10 ° is shown, this can be in the Practice also be much smaller. For the dimensioning of the Angle α is essential that a Sheet 2 always only a small part of the sheet leading edge 8 in the pressure gap between the transfer cylinder 3 and the Impression cylinder 5 is located. With a width of Pressure gap of z. B. 0.5 to 1 mm can be given in a Machine configuration an angle α of 1 ° or less are enough to achieve this.

Durch die Schrägstellung des Übertragungszylinders 3 wird erreicht, daß sich die Bögen 2 beim Verlassen des Druckspalts weniger leicht von dem Transportband 1 ablösen. Außerdem werden Stöße beim Einlauf und Auslauf der Bögen 2 in den bzw. aus dem Druckspalt vermieden. Solche Stöße werden besonders zuverlässig vermieden, wenn ein Abstand a zwischen aufeinanderfolgenden Bögen 2 klein ist, so daß sich in jedem Zeitpunkt wenigstens ein Bogen 2 im Druckspalt befindet.Due to the inclination of the transfer cylinder 3 achieved that the sheets 2 when leaving the printing nip detach less easily from the conveyor belt 1. Moreover are impacts at the inlet and outlet of the sheets 2 in the or avoided from the pressure gap. Such bumps become special reliably avoided if a distance a between consecutive sheets 2 is small, so that in each Time at least one sheet 2 is in the printing nip.

Der Schreibkopf 6, der z. B. ein langgestrecktes Array ist, das sich quer über die bedruckbare Bogenbreite erstreckt, kann parallel zu der Achse 4 des Übertragungszylinders 3 angeordnet sein. In diesem Fall müssen die dem Schreibkopf 6 zugeführten Bilddaten entsprechend der Schrägstellung des Übertragungszylinders 3 verändert oder beeinflußt werden. Bei einem Schreibkopf 6, der eine Reihe von in einem Pixelabstand nebeneinander angeordneten Bilderzeugungselementen enthält, können z. B. die Daten, die zu Bilderzeugungselementen gehören, die längs des Umfangs des Übertragungszylinders 3 näher am Bogen 2 liegen, entsprechend verzögert an den Schreibkopf 6 abgegeben werden. Außerdem gibt es eine Reihe von weiteren Möglichkeiten, die Schrägstellung des Übertragungszylinders 3 zu berücksichtigen, z. B. durch Winkeltransformation einer elektronisch gespeicherten Druckvorlage, "schräges" Abtasten und Auslesen einer Druckvorlage usw..The write head 6, the z. B. is an elongated array, that extends across the printable sheet width, can parallel to the axis 4 of the transfer cylinder 3rd be arranged. In this case, the print head 6 supplied image data according to the inclination of the Transfer cylinder 3 can be changed or influenced. At a write head 6 which is a series of at a pixel pitch contains imaging elements arranged side by side, can e.g. B. the data related to imaging elements belong along the circumference of the transfer cylinder 3rd closer to the bow 2, accordingly delayed to the Print head 6 are given. There are also a number of other ways to tilt the Transfer cylinder 3 to take into account, for. B. by Angular transformation of an electronically stored Print template, "oblique" scanning and reading one Print template etc.

Falls nicht aufgrund eines relativ kleinen Winkels α vernachläßigbar, muß außerdem die Änderung des Pixelabstandes bzw. der Druckbreite infolge der Schrägstellung berücksichtigt werden. If not due to a relatively small angle α negligible, must also change the pixel pitch or the printing width due to the inclination be taken into account.

Ebenso wie der Übertragungszylinder 3 können auch noch weitere Übertragungszylinder für zusätzliche Farben schräg gestellt werden.Just like the transfer cylinder 3 can also additional transfer cylinders for additional colors at an angle be put.

Die Schreibköpfe können auch parallel zur Bogenvorderkante 8 angeordnet sein, wie in Fig. 2 an einem weiteren Übertragungszylinder 9 beispielhaft durch einen gestrichelt eingezeichneten Schreibkopf 10 gezeigt ist. In diesem Fall ergibt sich keine Änderung des Pixelabstandes bzw. der Druckbreite, und die Bilddaten können dem Schreibkopf 10 ohne Veränderung zeilenweise zugeführt werden, so daß die Informationen auf genau die gleiche Weise wie bei einem gerade liegenden Übertragungszylinder verarbeitet werden. Falls der Winkel α klein ist und der Schreibkopf 10 von einer Art ist, bei der kein ganz genau bestimmter Abstand zum Übertragungszylinder 9 eingehalten werden muß, braucht der Schreibkopf 10 nicht speziell für diese Anordnung eingerichtet sein. Andernfalls sind auch Schreibkopfkonstruktionen denkbar, die sich gewissermaßen an den Übertragungszylinder 9 "anschmiegen".The print heads can also be parallel to the leading edge 8 of the sheet be arranged as in Fig. 2 on another Transfer cylinder 9, for example, by a dashed line shown write head 10 is shown. In this case there is no change in the pixel spacing or Print width, and the image data can the print head 10 without Change can be fed line by line so that the Information in exactly the same way as with one straight lying transfer cylinders are processed. If the angle α is small and the write head 10 of is of a type in which there is no precisely defined distance from the Transfer cylinder 9 must be adhered to Print head 10 not specifically for this arrangement be set up. Otherwise, too Print head constructions conceivable, so to speak "nestle" the transfer cylinder 9.

In beiden genannten Fällen kann das Farbwerk 7 auf eine übliche Weise angeordnet sein, d. h. parallel zur Achse des Übertragungszylinders 3 bzw. 9.In both cases mentioned, the inking unit 7 can be set to one be arranged in the usual way, d. H. parallel to the axis of the Transfer cylinder 3 or 9.

Anstelle von Druckwerken mit jeweils nur einem Übertragungszylinder 3 oder 9, wie in Fig. 1 und 2 gezeigt, können auch Druckwerke mit mehreren hintereinander geschalteten Übertragungszylindern verwendet werden, beispielsweise einem Zylinder, an dessen Umfang der Schreibkopf und das Farbwerk angeordnet sind, und einem darauf abrollenden weiteren Zylinder, der wiederum auf den Bögen bzw. dem Transportband abrollt.Instead of printing units with only one Transfer cylinder 3 or 9, as shown in Figs. 1 and 2, can also print units with several in a row switched transmission cylinders are used for example a cylinder, on the circumference of which Print head and the inking unit are arranged, and one rolling further cylinder on it, which in turn on the Rolls sheets or the conveyor belt.

Außerdem kann anstelle der Übertragungszylinder 3 oder 9 jeweils auch ein um zwei oder mehr Zylinder umlaufendes Band verwendet werden, auf dessen Oberfläche die Druckbilder erzeugt oder von einem vorgeschalteten Zylinder oder Band übertragen werden und dann von dieser Oberfläche aus auf die Bögen übertragen werden. In diesem Fall wird derjenige Zylinder, an dem die Druckfarbe von dem Band auf die Bögen übertragen wird, auf die in Fig. 2 gezeigte Weise über dem Transportband angeordnet. Es besteht dann die vorteilhafte Möglichkeit, den Schreibkopf so an einem geradlinig verlaufenden Abschnitt des Bandes anzuordnen, daß die latenten Bilder ohne irgendeine Anpassung der Bilddaten erzeugt werden und anschließend originalgetreue, unverzerrte Bilder auf die Bögen gedruckt werden.In addition, instead of the transfer cylinder 3 or 9 in each case also a belt rotating around two or more cylinders are used on the surface of the printed images generated or from an upstream cylinder or belt transferred and then from this surface to the Bows are transferred. In this case, the one Cylinder on which the printing ink from the ribbon to the sheets is transmitted in the manner shown in Fig. 2 over the Conveyor belt arranged. Then there is the advantageous one Possibility of keeping the printhead straight on to arrange the section of the tape that the latent images without any adjustment of the image data generated and then true to the original, undistorted Images can be printed on the sheets.

Eine alternative Ausführungsform, die nicht im einzelnen dargestellt ist, besteht darin, die Übertragungszylinder rechtwinklig zur Transportrichtung anzuordnen und den Anleger der Druckmaschine so auszubilden, daß die Bögen jeweils in einer Schrägstellung auf das Transportband befördert werden, wobei ihre Längskanten in einem kleinen Winkel zur Transportrichtung verlaufen. Auch in diesem Fall bestehen die beiden in Verbindung mit Fig. 2 erläuterten Möglichkeiten, die Schreibköpfe entweder parallel zur Bogenvorderkante oder rechtwinklig zur Transportrichtung anzuordnen und jeweils geeignet anzusteuern. An alternative embodiment that is not in detail is shown is the transfer cylinder to be arranged at right angles to the direction of transport and the feeder the press so that the sheets are each in an inclined position on the conveyor belt, with its long edges at a small angle to Direction of transport run. In this case, too two possibilities explained in connection with FIG. 2, the print heads either parallel to the leading edge of the sheet or to be arranged at right angles to the direction of transport and each suitable to control.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
TransportbandConveyor belt
22nd
Bogenarc
33rd
übertragungszylindertransfer cylinder
44th
Achseaxis
55
GegendruckzylinderImpression cylinder
66
SchreibkopfPrinthead
77
FarbwerkInking unit
88th
BogenvorderkanteLeading edge
99
übertragungszylindertransfer cylinder
1010th
SchreibkopfPrinthead
PP
TransportrichtungDirection of transport
aa
Abstanddistance

Claims (11)

  1. Digital printing machine comprising an endless conveyor belt having an extended section on which substrates to be printed are successively conveyed through the printing machine in a transport direction, and comprising one or multiple printing units respectively having a cylinder arranged opposite the extended section of the conveyor belt and the substrates conveyed on it, said cylinder being rotatable in synchronism with the movement of said conveyor belt, in order to transfer printing ink to said substrates in a distribution corresponding to a desired printing image,
    wherein each of the cylinders (3; 9) is arranged in a way that the angle between its axis (4) and the transport direction (P) is different from 90°.
  2. Digital printing machine according to Claim 1,
    wherein the printing ink to be transferred is located on a surface of the cylinder (3; 4) or on a surface of a belt revolving around said cylinder.
  3. Digital printing machine according to Claim 2,
    wherein each printing unit comprises an extended writing device (6; 10) controllable through electric signals and arranged transverse to the transport direction (P) alongside the surface of the cylinder (3; 9) or the surface of the belt revolving around the cylinder, said writing device producing on said surface latent images corresponding to said electric signals, and an inking unit (7) for developing the latent images with printing ink.
  4. Digital printing machine according to Claim 3,
    wherein the writing device (10) is arranged at an angle of 90° relative to the transport direction (P).
  5. Digital printing machine according to Claim 3,
    wherein the writing device (6) is arranged in parallel to the axis of the cylinder (3).
  6. Digital printing machine according to one of the preceding claims,
    wherein a device for generating attracting forces between the conveyor belt (1) and the substrates (2) conveyed thereon is provided.
  7. Digital printing machine according to Claim 6,
    wherein the attracting forces are electrostatic forces.
  8. Method for conveying substrates to be printed in a printing machine by means of an endless conveyor belt past one or multiple digital printing units,
    whereby the substrates (2) are deposited and oriented on the conveyor belt (1) in such a way that the angle between the front edge (8) of the substrates and the transport direction (P) of the conveyor belt is different from 90°.
  9. Method according to Claim 8,
    whereby at the digital printing units printing ink is generated in a distribution corresponding to the desired printing images and transferred onto the substrates (2), and whereby the printing images are produced in an orientation corresponding to the skew position of the substrates.
  10. Method according to Claim 8 or 9,
    whereby attracting forces are generated between the conveyor belt (1) and the substrates (2) conveyed thereon.
  11. Method according to Claim 10,
    wherein the attracting forces are generated electrostatically.
EP96119438A 1995-12-04 1996-12-04 Digital printing machine and method for its conveying of sheets Expired - Lifetime EP0778129B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19545113A DE19545113A1 (en) 1995-12-04 1995-12-04 Digital printing machine and sheet transport method therefor
DE19545113 1995-12-04

Publications (2)

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EP0778129A1 EP0778129A1 (en) 1997-06-11
EP0778129B1 true EP0778129B1 (en) 2000-06-07

Family

ID=7779100

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US (1) US5819667A (en)
EP (1) EP0778129B1 (en)
JP (1) JPH09179412A (en)
KR (1) KR100227099B1 (en)
DE (2) DE19545113A1 (en)

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EP3419832B1 (en) 2016-02-26 2021-10-06 Amcor Flexibles Sélestat SAS Flexible packaging substrates comprising thermally-stable prints
JP2019515845A (en) 2016-03-18 2019-06-13 アムコア フレキスィブルス セレスタ エスエーエス Printed flexible laminates for retort packaging

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Also Published As

Publication number Publication date
US5819667A (en) 1998-10-13
DE19545113A1 (en) 1997-06-05
JPH09179412A (en) 1997-07-11
KR970033849A (en) 1997-07-22
DE59605394D1 (en) 2000-07-13
EP0778129A1 (en) 1997-06-11
KR100227099B1 (en) 1999-10-15

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