EP0368178B1 - Process for direct image formation in printing cylinders - Google Patents

Process for direct image formation in printing cylinders Download PDF

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Publication number
EP0368178B1
EP0368178B1 EP89120428A EP89120428A EP0368178B1 EP 0368178 B1 EP0368178 B1 EP 0368178B1 EP 89120428 A EP89120428 A EP 89120428A EP 89120428 A EP89120428 A EP 89120428A EP 0368178 B1 EP0368178 B1 EP 0368178B1
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EP
European Patent Office
Prior art keywords
printing
cylinder
forme cylinder
transfer belt
substance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89120428A
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German (de)
French (fr)
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EP0368178A2 (en
EP0368178A3 (en
Inventor
Josef Dr. Schneider
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0368178A2 publication Critical patent/EP0368178A2/en
Publication of EP0368178A3 publication Critical patent/EP0368178A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1091—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by physical transfer from a donor sheet having an uniform coating of lithographic material using thermal means as provided by a thermal head or a laser; by mechanical pressure, e.g. from a typewriter by electrical recording ribbon therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1075—Mechanical aspects of on-press plate preparation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/70—Forming the printing surface directly on the form cylinder

Definitions

  • the invention relates to a method for direct imaging of a printing form cylinder by means of an image-appropriate application of substance influencing the color guidance to parts of the printing form cylinder surface by means of a pixel transmission unit in accordance with digital image information.
  • An offset printing machine on which such a method is practiced is known from DE-PS 32 48 178.
  • substance parts are released from an electronically controlled pixel transmission unit in accordance with digital image information from a continuously coated thermal transfer film and placed directly on the printing form cylinder.
  • the disadvantage of this method is the relatively low transfer speed when transferring the substance point by point and the relatively large space requirement for the pixel transfer unit, which prevents use in compactly constructed printing machines.
  • a pixel transfer unit is required on each forme cylinder, which is very complex and therefore expensive.
  • the invention has for its object to develop a method in which the direct imaging of a printing form cylinder can be done faster, cheaper and with less space.
  • a transfer belt is connected between the pixel transfer unit and the printing form cylinder has the following advantages:
  • the transfer speed when transferring the substance to the printing form cylinder line by line or in multiple lines is substantially higher than when transferring the substance parts point by point to the transfer belt by the pixel transfer unit.
  • Transfer ribbons can be created outside of the press regardless of the printing process, making it easy with one Pixel transfer unit
  • the scope of the print images temporarily stored on the transfer belt can advantageously include all print images required for production in different printing units.
  • the space required for a transfer belt is no greater than that of a printing material web.
  • the means necessary for guiding, transporting and registering which are already available for the printing material web, can also be used for the transfer belt as far as possible.
  • Fig. 1, 1 schematically denotes a printing form cylinder and 2 a printing cylinder of a rotary printing press.
  • the printing form cylinder 1 can be designed as an intaglio printing form cylinder, as a screen printing form cylinder or as a DiLitho form cylinder, which during the actual printing process, not shown, generates a print image on a printing material web guided past it and supported by the printing cylinder 2 according to the ink-carrying parts of its surface.
  • the path of the substrate is indicated with 3 dashed lines.
  • heating devices 4, 5 are provided above and below the path 3 of the printing material web.
  • On the outlet side 1 further heating devices 6 are arranged close to the printing form cylinder.
  • a transfer belt 7 is provided, which by means of a method, not shown - as known in principle from DE-PS 32 48 178 - such as thermal transfer by means of a thermal print head or pen electrodes, by a toner printing process or by melt spraying a device similar to an inkjet printer was provided with an image-appropriate application of substance particles 8 influencing the color guidance.
  • the substance particles 8 can, for example, be made of wax, a thermoplastic or another material which, after being applied by a pixel transmission unit (not shown) (see also the patent applications EP-A-0368179 and EP-A-0368177 filed in parallel; and on the Transfer belt 7 cools down immediately and solidifies.
  • the transfer belt 7 is introduced into the printing press along the path 3 provided for a printing material web, it being possible to use all of the devices available for its transport and all of the register setting devices.
  • the substance parts 8 are melted again and when the gap subsequently passes through the pressure cylinder 2, which presses on the underside of the transfer belt 7, is pressed against the printing form cylinder 1, where they harden immediately in contact with the cold surface thereof.
  • the substance particles 8 influence the color guidance on the surface of the printing form cylinder 1 in different ways, depending on the type thereof. If the printing form cylinder 1 is an intaglio printing cylinder with a uniform cell basic grid, the cells are partially filled with the substance particles 8. When inking, there is then only a correspondingly reduced ink volume available for the printing ink (see also parallel patent application EP-A-0368177;
  • the substance parts 8 close the holes on the image parts free of color during printing.
  • the printing form cylinder 1 is a DiLitho form cylinder of an offset printing press, the surface of which is initially continuously provided with a hydrophilic coating, the substance parts with their oleophilic properties mark the color-guiding print image parts.
  • the transfer belt 7 is removed from the printing press and replaced by the printing material web.
  • the substance can be removed by an erasing device 9 arranged on the printing form cylinder 1 and the printing form cylinder 1 can thereby be prepared for a new imaging.
  • the extinguishing process takes place by reheating and liquefying the substance, which is supported by doctoring and / or wiping or blowing with hot air.
  • a printing unit of an offset rotary printing press is shown schematically, which comprises a printing form cylinder 11, a printing cylinder 12 and a blanket cylinder 10 arranged between them.
  • the of further inking and dampening units employed on the printing form cylinder 11 are omitted since they are of no importance for the present invention.
  • a printing material web is passed horizontally between blanket cylinder 10 and printing cylinder 12 on a path 13 indicated by dashed lines.
  • a transfer belt 14 is at least partially introduced into the printing press in the way that is customary for the printing material web.
  • the transfer belt 14 was provided with an image-appropriate substance application on its underside by a pixel transmission unit.
  • the transfer belt 14 After passing the gap between the blanket cylinder 10 and the impression cylinder 12, the transfer belt 14 is guided around the blanket cylinder 10 in a departure from the path 13 of the printing material web.
  • the blanket cylinder 10 is equipped with grippers which are arranged laterally and are known from sheet-fed offset machines.
  • a heating device 15 is directed onto the blanket cylinder 10 and melts the substance parts 16.
  • a printing form cylinder illustrated in this way is deleted after the printing process has ended, analogously to the first exemplary embodiment, by means of a deleting device (not shown) which can be set on the printing form cylinder 11.
  • a printing unit of an offset rotary printing press that is identical in the cylinder configuration to the second exemplary embodiment is schematically shown, which comprises a blanket cylinder 20, a printing form cylinder 21 and a printing cylinder 22.
  • the 23 is dashed denotes the indicated path that a printing material web takes during the printing process, not shown.
  • a switch 24 is arranged in front of the printing unit.
  • a branching branch 25 leads from the switch 24 to the gap between the printing form cylinder 21 and the blanket cylinder 20.
  • the position of the switch 24 depends on the task to be done: When printing a printing material web is guided on the path 23 between the blanket cylinder 20 and the printing cylinder 22. To image the printing form cylinder 21, a transfer belt 26 provided on its upper side with an image-appropriate substance application is guided over the branching strand 25; the substance parts 28 are melted by a heating device 27 and pressed by the blanket cylinder 20, which presses against the transfer belt from the rear, against the printing form cylinder 21, where they immediately solidify in contact with the cold surface thereof.
  • the transfer belt 26 can be fed back to the path 23 of a printing material web via a further switch 29, so that the branching strand 25 forms a complete bypass in the region of the printing unit to the path 23 of the printing material web.
  • a printing unit of an offset rotary printing press is schematically shown, which comprises a blanket cylinder 30, a printing form cylinder 31 and a printing cylinder 32.
  • 33 denotes the path indicated by dashed lines that a printing material web takes through the machine during the printing process, not shown.
  • a transfer belt 34 previously provided by means of a pixel transfer unit with an image-appropriate substance application (see parallel patent application EP-A-0368179; inserted in the printing machine) is introduced into the printing machine in order to image the printing form cylinder 31 36 melted and then pressed against the latter as it passed the gap between the printing cylinder 32 and the blanket cylinder 30.
  • the substance parts 36 In contact with the cold surface of the blanket cylinder 30 the substance parts 36 initially solidify on this. In a second transfer step, the substance parts 36 are liquefied again by a further heating device 37 directed towards the blanket cylinder 30 and transferred from the blanket cylinder to the printing form cylinder 31. There, the solidified substance parts 36, with their oleophilic properties, form the ink-bearing image parts on the printing form cylinder 31, which is otherwise provided with a continuous hydrophilic coating.
  • a printing forme cylinder illustrated in this way can be erased analogously to the first exemplary embodiment by means of an erasing device, not shown here.
  • the invention is based on the core idea of choosing the reverse path as far as possible for the creation of a print image on a printing form cylinder, which the colored print image takes during the actual printing process.

Description

Die Erfindung betrifft ein Verfahren zur direkten Bebilderung eines Druckformzylinders mittels eines bildadäquaten, die Farbführung beeinflussenden Substanzauftrages auf Teile der Druckformzylinder-Oberfläche durch eine Bildpunkt- Übertragungseinheit entsprechend einer digitalen Bildinformation.The invention relates to a method for direct imaging of a printing form cylinder by means of an image-appropriate application of substance influencing the color guidance to parts of the printing form cylinder surface by means of a pixel transmission unit in accordance with digital image information.

Eine Offset- Druckmaschine, an der ein solches Verfahren praktiziert wird, ist aus der DE-PS 32 48 178 bekannt. Bei dieser werden Substanzteile von einer elektronisch gesteuerten Bildpunkt-Übertragungseinheit entsprechend einer digitalen Bildinformation aus einer durchgehend beschichteten Thermotransferfolie herausgelöst und unmittelbar auf dem Druckformzylinder abgelegt. Nachteilig bei diesem Verfahren ist die relativ geringe Übertragungsgeschwindigkeit beim punktweisen Übertragen der Substanz sowie der relativ große Platzbedarf für die Bildpunkt- Übertragungseinheit, die einem Einsatz in kompakt gebauten Druckmaschinen entgegensteht. Weiterhin ist an jedem Formzylinder eine Bildpunkt- Übertragungseinheit nötig, was sehr aufwendig und somit teuer ist.An offset printing machine on which such a method is practiced is known from DE-PS 32 48 178. In this case, substance parts are released from an electronically controlled pixel transmission unit in accordance with digital image information from a continuously coated thermal transfer film and placed directly on the printing form cylinder. The disadvantage of this method is the relatively low transfer speed when transferring the substance point by point and the relatively large space requirement for the pixel transfer unit, which prevents use in compactly constructed printing machines. Furthermore, a pixel transfer unit is required on each forme cylinder, which is very complex and therefore expensive.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu entwickeln, bei dem die direkte Bebilderung eines Druckformzylinders schneller, kostengünstiger und mit geringerem Platzbedarf erfolgen kann.The invention has for its object to develop a method in which the direct imaging of a printing form cylinder can be done faster, cheaper and with less space.

Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Verfahrensschritte gelöst. Dadurch, daß zwischen Bildpunkt- Übertragungseinheit und Druckformzylinder ein Transferband geschaltet ist, ergeben sich folgende Vorteile:
Die Übertragungsgeschwindigkeit ist beim zeilenweisen oder mehrzeiligen Übertragen der Substanz an den Druckformzylinder wesentlich höher, als beim punktweisen Übertragen der Substanzteile an das Transferband durch die Bildpunkt- Übertragungseinheit. Transferbänder können außerhalb der Druckmaschine unabhängig vom Druckvorgang erstellt werden, wodurch sich mit einer einzigen Bildpunkt- Übertragungseinheit Druckbilder für mehrere Druckformzylinder herstellen lassen. Der Umfang der auf Transferband zwischengespeicherten Druckbilder kann vorteilhaft alle für eine Produktion in verschiedenen Druckwerken erforderlichen Druckbilder umfassen. Der Platzbedarf für ein Transferband ist nicht größer als der einer Bedruckstoffbahn. Es lassen sich - abhängig vom Druckmaschinentyp - weitestgehend die zur Führung, zum Transport und zur Registereinstellung erforderlichen Mittel, die für die Bedruckstoffbahn ohnehin vorhanden sind, auch für das Transferband verwenden.This object is achieved by the method steps specified in the characterizing part of claim 1. The fact that a transfer belt is connected between the pixel transfer unit and the printing form cylinder has the following advantages:
The transfer speed when transferring the substance to the printing form cylinder line by line or in multiple lines is substantially higher than when transferring the substance parts point by point to the transfer belt by the pixel transfer unit. Transfer ribbons can be created outside of the press regardless of the printing process, making it easy with one Pixel transfer unit Print images for several printing form cylinders. The scope of the print images temporarily stored on the transfer belt can advantageously include all print images required for production in different printing units. The space required for a transfer belt is no greater than that of a printing material web. Depending on the type of printing press, the means necessary for guiding, transporting and registering, which are already available for the printing material web, can also be used for the transfer belt as far as possible.

Nachstehend sind vier Ausführungsbeispiele für die Erfindung anhand der Zeichnungen erklärt. Es zeigt

Fig 1
die Direktbebilderung eines Druckformzylinders, dessen Oberfläche beim Bedrucken unmittelbar an einer Bedruckstoffbahn anliegt,
Fig. 2
die Direktbebilderung eines Druckformzylinders einer Offset- Druckmaschine unter Abweichung vom Weg der Bedruckstoffbahn,
Fig. 3
eine Variante zur Fig. 2 und
Fig. 4
die Direktbebilderung eines Druckformzylinders einer Offset- Druckmaschine unter Zwischenschaltung eines zusätzlichen Tansferschrittes über den Gummituchzylinder.
Four exemplary embodiments of the invention are explained below with reference to the drawings. It shows
Fig. 1
the direct imaging of a printing form cylinder, the surface of which lies directly against a printing material web during printing,
Fig. 2
the direct imaging of a printing form cylinder of an offset printing machine deviating from the path of the printing material web,
Fig. 3
a variant of Fig. 2 and
Fig. 4
the direct imaging of a printing form cylinder of an offset printing machine with the interposition of an additional transfer step via the blanket cylinder.

In Fig. 1 ist schematisch mit 1 ein Druckformzylinder und mit 2 ein Druckzylinder einer Rotations- Druckmaschine bezeichnet. Der Druckformzylinder 1 kann dabei als Tiefdruckformzylinder, als Siebdruckformzylinder oder als DiLitho- Formzylinder ausgebildet sein, der beim eigentlichen, nicht dargestellten Druckvorgang ein Druckbild auf einer an ihm vorbeigeführten, durch den Druckzylinder 2 gegengestützten Bedruckstoffbahn entsprechend der farbführenden Partien seiner Oberfläche erzeugt. Der Weg der Bedruckstoffbahn ist mit 3 gestrichelt angedeutet. Vor dem vom Druckformzylinder 1 und dem Druckzylinder 2 gebildeten Einlaufspalt sind oberhalb und unterhalb des Weges 3 der Bedruckstoffbahn Heizvorrichtungen 4, 5 vorgesehen. Auf der Auslaufseite sind nahe am Druckformzylinder 1 weitere Heizvorrichtungen 6 angeordnet.In Fig. 1, 1 schematically denotes a printing form cylinder and 2 a printing cylinder of a rotary printing press. The printing form cylinder 1 can be designed as an intaglio printing form cylinder, as a screen printing form cylinder or as a DiLitho form cylinder, which during the actual printing process, not shown, generates a print image on a printing material web guided past it and supported by the printing cylinder 2 according to the ink-carrying parts of its surface. The path of the substrate is indicated with 3 dashed lines. In front of the inlet gap formed by the printing form cylinder 1 and the printing cylinder 2, heating devices 4, 5 are provided above and below the path 3 of the printing material web. On the outlet side 1 further heating devices 6 are arranged close to the printing form cylinder.

Zur direkten Bebilderung des Druckformzylinders 1 ist ein Transferband 7 vorgesehen, das nach einem nicht dargestellten - da aus der DE-PS 32 48 178 prinzipiell bekannten - Verfahren, wie beispielsweise Thermotransfer mittels Thermodruckkopf oder Stiftelektroden, durch ein Toner- Druckverfahren oder auch durch Schmelzspritzen mittels einer einem Tintenstrahldrucker ähnlichen Vorrichtung mit einem bildadäquaten Auftrag von die Farbführung beeinflussenden Substanzpartikeln 8 versehen wurde. Die Substanzpartikel 8 können beispielsweise aus Wachs, einem thermoplastischen Kunststoff oder einem sonstigen Material sein, das nach dem Aufbringen durch eine nicht dargestellte Bildpunkt-Übertragungseinheit (siehe auch die parallel eingereichten Patentanmeldungen EP-A-0368179 und EP-A-0368177; und auf dem Transferband 7 sofort abkühlt und sich verfestigt.For direct imaging of the printing form cylinder 1, a transfer belt 7 is provided, which by means of a method, not shown - as known in principle from DE-PS 32 48 178 - such as thermal transfer by means of a thermal print head or pen electrodes, by a toner printing process or by melt spraying a device similar to an inkjet printer was provided with an image-appropriate application of substance particles 8 influencing the color guidance. The substance particles 8 can, for example, be made of wax, a thermoplastic or another material which, after being applied by a pixel transmission unit (not shown) (see also the patent applications EP-A-0368179 and EP-A-0368177 filed in parallel; and on the Transfer belt 7 cools down immediately and solidifies.

Das Transferband 7 wird auf dem für eine Bedruckstoffbahn vorgesehenen Weg 3 in die Druckmaschine eingeführt, wobei alle für deren Transport vorhandene Vorrichtungen sowie alle Registereinstellvorrichtungen verwendbar sind. Beim Passieren der Heizvorrichtungen 4, 5 werden die Substanzteile 8 erneut geschmolzen und beim anschließenden Durchlaufen des Spaltes vom auf die Unterseite des Transferbandes 7 drückenden Druckzylinder 2 gegen den Druckformzylinder 1 gepreßt, wo sie in Kontakt mit dessen kalter Oberfläche sofort wieder aushärten.The transfer belt 7 is introduced into the printing press along the path 3 provided for a printing material web, it being possible to use all of the devices available for its transport and all of the register setting devices. When passing through the heating devices 4, 5, the substance parts 8 are melted again and when the gap subsequently passes through the pressure cylinder 2, which presses on the underside of the transfer belt 7, is pressed against the printing form cylinder 1, where they harden immediately in contact with the cold surface thereof.

Falls der Substanz für das schnelle Schmelzen beim Auftrag aufs Transferband und bei der Übertragung an den Druckformzylinder entsprechende chemische Substanzen, wie Weichmacher oder Lösungsmittel, beigegeben wurden, so werden diese von der nachgeordneten Heizvorrichtung 6 ausgetrieben, womit die Substanzpartikel 8 auf ihre endgültige Festigkeit gebracht werden.If the substance for the rapid melting during application to the transfer belt and during transfer to the printing form cylinder has been mixed with appropriate chemical substances, such as plasticizers or solvents, these are driven out by the downstream heating device 6, with which the Substance particles 8 are brought to their final strength.

Die Substanzpartikel 8 beeinflussen die Farbführung an der Oberfläche des Druckformzylinders 1 je nach Art desselben auf verschiedene Weise. Ist der Druckformzylinder 1 ein Tiefdruckzylinder mit einem einheitlichen Näpfchengrundraster, so werden die Näpfchen teilweise von den Substanzpartikeln 8 gefüllt. Beim Einfärben steht dann für die Druckfarbe nur ein entsprechend vermindertes Farbvolumen zur Verfügung (siehe auch parallele Patentanmeldung EP-A-0368177; .The substance particles 8 influence the color guidance on the surface of the printing form cylinder 1 in different ways, depending on the type thereof. If the printing form cylinder 1 is an intaglio printing cylinder with a uniform cell basic grid, the cells are partially filled with the substance particles 8. When inking, there is then only a correspondingly reduced ink volume available for the printing ink (see also parallel patent application EP-A-0368177;

Ist der Druckformzylinder 1 ein Siebdruckzylinder mit einem gleichmäßigen Maschen- oder Lochraster, so verschließen die Substanzteile 8 an den beim Drucken farbfreien Bildpartien die Löcher.If the printing form cylinder 1 is a screen printing cylinder with a uniform mesh or hole pattern, then the substance parts 8 close the holes on the image parts free of color during printing.

Ist der Druckformzylinder 1 ein DiLitho-Formzylinder einer Offset-Druckmaschine, dessen Oberfläche zunächst durchgehend mit einer hydrophilen Beschichtung versehen ist, so markieren die Substanzteile mit ihrer oleophilen Eigenschaft die farbführenden Druckbildteile.If the printing form cylinder 1 is a DiLitho form cylinder of an offset printing press, the surface of which is initially continuously provided with a hydrophilic coating, the substance parts with their oleophilic properties mark the color-guiding print image parts.

Wenn das Druckbild auf alle Druckformzylinder 1 vollständig übertragen ist, wird das Transferband 7 aus der Druckmaschine entfernt und durch die Bedruckstoffbahn ersetzt. Nach Beendigung des Druckvorganges kann die Substanz durch eine am Druckformzylinder 1 angeordnete Löscheinrichtung 9 entfernt werden und der Druckformzylinder 1 dadurch für eine erneute Bebilderung vorbereitet werden. Der Löschvorgang geschieht durch erneutes Erhitzen und Verflüssigen der Substanz, das durch Abrakeln und/oder Abwischen oder Ausblasen mit Heißluft unterstützt wird.When the print image has been completely transferred to all printing form cylinders 1, the transfer belt 7 is removed from the printing press and replaced by the printing material web. After the printing process has ended, the substance can be removed by an erasing device 9 arranged on the printing form cylinder 1 and the printing form cylinder 1 can thereby be prepared for a new imaging. The extinguishing process takes place by reheating and liquefying the substance, which is supported by doctoring and / or wiping or blowing with hot air.

In einem zweiten Ausführungsbeispiel (Fig. 2) ist schematisch ein Druckwerk einer Offset- Rotationsdruckmaschine dargestellt, das einen Druckformzylinder 11, einen Druckzylinder 12 sowie einen zwischen diesen angeordneten Gummituchzylinder 10 umfaßt. Die des weiteren an den Druckformzylinder 11 angestellten Farb- und Feuchtwerke, sind, da für die vorliegende Erfindung ohne Bedeutung, weggelassen. Beim nicht dargestellten Druckvorgang wird eine Bedruckstoffbahn auf einem gestrichelt angedeuteten Weg 13 horizontal zwischen Gummituchzylinder 10 und Druckzylinder 12 hindurchgeführt.In a second exemplary embodiment (FIG. 2), a printing unit of an offset rotary printing press is shown schematically, which comprises a printing form cylinder 11, a printing cylinder 12 and a blanket cylinder 10 arranged between them. The of further inking and dampening units employed on the printing form cylinder 11 are omitted since they are of no importance for the present invention. In the printing process, not shown, a printing material web is passed horizontally between blanket cylinder 10 and printing cylinder 12 on a path 13 indicated by dashed lines.

Zur Bebilderung des Druckformzylinders 1 wird ein Transferband 14 zumindestens teilweise auf dem für die Bedruckstoffbahn üblichen Weg in die Druckmaschine eingeführt. Das Transferband 14 wurde analog zum ersten Ausführungsbeispiel von einer Bildpunkt-Übertragungseinheit an seiner Unterseite mit einem bildadäquaten Substanzauftrag versehen. Nach dem Passieren des Spaltes zwischen Gummituchzylinder 10 und Druckzylinder 12 wird das Transferband 14 abweichend vom Weg 13 der Bedruckstoffbahn um den Gummituchzylinder 10 herumgeführt. Der Gummituchzylinder 10 ist zu diesem Zweck mit von Bogen- Offsetmaschinen her bekannten, seitlich angeordneten Greifern bestückt. Auf den Gummituchzylinder 10 ist eine Heizvorrichtung 15 gerichtet, die die Substanzteile 16 schmilzt. Durch den Druck des Gummituchzylinders 10 auf die Rückseite des Transferbandes 14 werden die verflüssigten Substanzteile 16 beim Passieren des Spaltes zwischen Druckformzylinder 11 und Gummituchzylinder 10 an den Druckformzylinder 11 angepreßt, wo sie in Kontakt mit dessen kalter Oberfläche sofort aushärten. Die Substanzteile 16 markieren mit ihrer oleophilen Eigenschaft auf dem ansonsten durchgehend mit einer hydrophilen Beschichtung versehenen Druckformzylinder 11 die farbführenden Bildteile. Das Löschen eines derart bebilderten Druckformzylinders nach Beendigung des Druckvorgangs erfolgt analog zum ersten Ausführungsbeispiel mittels einer an den Druckformzylinder 11 anstellbaren, nicht dargestellten Löschvorrichtung.To image the printing form cylinder 1, a transfer belt 14 is at least partially introduced into the printing press in the way that is customary for the printing material web. Analogous to the first exemplary embodiment, the transfer belt 14 was provided with an image-appropriate substance application on its underside by a pixel transmission unit. After passing the gap between the blanket cylinder 10 and the impression cylinder 12, the transfer belt 14 is guided around the blanket cylinder 10 in a departure from the path 13 of the printing material web. For this purpose, the blanket cylinder 10 is equipped with grippers which are arranged laterally and are known from sheet-fed offset machines. A heating device 15 is directed onto the blanket cylinder 10 and melts the substance parts 16. Due to the pressure of the blanket cylinder 10 on the back of the transfer belt 14, the liquefied substance parts 16 are pressed against the printing form cylinder 11 when they pass the gap between the printing plate cylinder 11 and the blanket cylinder 10, where they harden immediately in contact with the cold surface thereof. The substance parts 16, with their oleophilic properties, mark the ink-carrying image parts on the printing form cylinder 11, which is otherwise provided with a hydrophilic coating throughout. A printing form cylinder illustrated in this way is deleted after the printing process has ended, analogously to the first exemplary embodiment, by means of a deleting device (not shown) which can be set on the printing form cylinder 11.

Bei einem dritten Ausführungsbeispiel (Fig. 3) ist schematisch ein in der Zylinderkonfiguration dem zweiten Ausführungsbeispiel gleichendes Druckwerk einer Offset- Rotationsdruckmaschine dargestellt, das einen Gummituchzylinder 20, einen Druckformzylinder 21 und einen Druckzylinder 22 umfaßt. Mit 23 ist der gestrichelt angedeutete Weg bezeichnet, den eine Bedruckstoffbahn beim nicht dargestellten Druckvorgang nimmt. In diesem Weg 23, der durch den Spalt zwischen Gummituchzylinder 20 und Druckzylinder 22 führt, ist vor dem Druckwerk eine Weiche 24 angeordnet. Ein abzweigender Strang 25 führt von der Weiche 24 zum Spalt zwischen Druckformzylinder 21 und Gummituchzylinder 20. Die Stellung der Weiche 24 richtet sich je nach der zu erledigenden Aufgabe: Beim Drucken wird
eine Bedruckstoffbahn auf dem Weg 23 zwischen Gummituchzylinder 20 und Druckzylinder 22 hindurchgeführt. Zum Bebildern des Druckformzylinders 21 wird ein an seiner Oberseite mit einem bildadäquaten Substanzauftrag versehenes Transferband 26 über den abzweigenden Strang 25 geführt; durch eine Heizvorrichtung 27 werden die Substanzteile 28 geschmolzen und durch den von der Rückseite gegen das Transferband drückenden Gummituchzylinder 20 gegen den Druckformzylinder 21 gepreßt, wo sie in Kontakt mit dessen kalter Oberfläche sofort erstarren. Das Transferband 26 kann nach Abgabe der Substanzteile 28 über eine weitere Weiche 29 wieder auf den Weg 23 einer Bedruckstoffbahn zurückgeführt werden, sodaß der abzweigende Strang 25 im Bereich des Druckwerks zum Weg 23 der Bedruckstoffbahn einen kompletten Bypass bildet.In a third exemplary embodiment (FIG. 3), a printing unit of an offset rotary printing press that is identical in the cylinder configuration to the second exemplary embodiment is schematically shown, which comprises a blanket cylinder 20, a printing form cylinder 21 and a printing cylinder 22. The 23 is dashed denotes the indicated path that a printing material web takes during the printing process, not shown. In this way 23, which leads through the gap between the blanket cylinder 20 and the printing cylinder 22, a switch 24 is arranged in front of the printing unit. A branching branch 25 leads from the switch 24 to the gap between the printing form cylinder 21 and the blanket cylinder 20. The position of the switch 24 depends on the task to be done: When printing
a printing material web is guided on the path 23 between the blanket cylinder 20 and the printing cylinder 22. To image the printing form cylinder 21, a transfer belt 26 provided on its upper side with an image-appropriate substance application is guided over the branching strand 25; the substance parts 28 are melted by a heating device 27 and pressed by the blanket cylinder 20, which presses against the transfer belt from the rear, against the printing form cylinder 21, where they immediately solidify in contact with the cold surface thereof. After the substance parts 28 have been dispensed, the transfer belt 26 can be fed back to the path 23 of a printing material web via a further switch 29, so that the branching strand 25 forms a complete bypass in the region of the printing unit to the path 23 of the printing material web.

Bei einer weiteren, in Fig. 4 gezeigten Variante ist schematisch ein Druckwerk einer Offset- Rotationsdruckmaschine dargestellt, das einen Gummituchzylinder 30, einen Druckformzylinder 31 und einen Druckzylinder 32 umfaßt. Mit 33 ist der gestrichelt angedeutete Weg bezeichnet, den eine Bedruckstoffbahn beim nicht dargestellten Druckvorgang durch die Maschine nimmt. Auf demselben Weg 33 wird zum Bebildern des Druckformzylinders 31 ein zuvor mittels einer Bildpunkt- Übertragungseinheit mit einem bildadäquaten Substanzauftrag (siehe parallele Patentanmeldung EP-A-0368179; versehenes Transferband 34 in die Druckmaschine eingeführt. Mittels einer vor dem Druckwerk angeordneten Heizvorrichtung 35 werden die Substanzteile 36 geschmolzen und anschließend beim Passieren des Spaltes zwischen Druckzylinder 32 und Gummituchzylinder 30 an letzteren angepreßt. In Kontakt mit der kalten Oberfläche des Gummituchzylinders 30 erstarren die Substanzteile 36 zunächst auf dieser. In einem zweiten Transferschritt werden die Substanzteile 36 durch eine weitere, auf den Gummituchzylinder 30 gerichtete Heizvorrichtung 37 erneut verflüssigt und vom Gummituchzylinder an den Druckformzylinder 31 übertragen. Dort bilden die erstarrten Substanzteile 36 mit ihrer oleophilen Eigenschaft auf dem im übrigen mit einer durchgehenden hydrophilen Beschichtung versehenen Druckformzylinder 31 beim Druckvorgang die farbführenden Bildteile.In a further variant shown in FIG. 4, a printing unit of an offset rotary printing press is schematically shown, which comprises a blanket cylinder 30, a printing form cylinder 31 and a printing cylinder 32. 33 denotes the path indicated by dashed lines that a printing material web takes through the machine during the printing process, not shown. In the same way 33, a transfer belt 34, previously provided by means of a pixel transfer unit with an image-appropriate substance application (see parallel patent application EP-A-0368179; inserted in the printing machine) is introduced into the printing machine in order to image the printing form cylinder 31 36 melted and then pressed against the latter as it passed the gap between the printing cylinder 32 and the blanket cylinder 30. In contact with the cold surface of the blanket cylinder 30 the substance parts 36 initially solidify on this. In a second transfer step, the substance parts 36 are liquefied again by a further heating device 37 directed towards the blanket cylinder 30 and transferred from the blanket cylinder to the printing form cylinder 31. There, the solidified substance parts 36, with their oleophilic properties, form the ink-bearing image parts on the printing form cylinder 31, which is otherwise provided with a continuous hydrophilic coating.

Das Löschen eines derart bebilderten Druckformzylinders kann analog zum ersten Ausführungsbeispiel mittels einer hier nicht gezeigten Löschvorrichtung erfolgen.A printing forme cylinder illustrated in this way can be erased analogously to the first exemplary embodiment by means of an erasing device, not shown here.

Der Erfindung liegt in allen vorstehenden Varianten der Kerngedanke zugrunde, für die Schaffung eines Druckbildes auf einem Druckformzylinder soweit als möglich den umgekehrten Weg zu wählen, den das farbige Druckbild beim eigentlichen Druckvorgang nimmt.In all of the above variants, the invention is based on the core idea of choosing the reverse path as far as possible for the creation of a print image on a printing form cylinder, which the colored print image takes during the actual printing process.

Es sei abschließend noch angemerkt, daß die Substanzteile in allen Figuren aus zeichnerischen Gründen gegenüber ihrer realen Größe wesentlich vergrößert dargestellt sind.Finally, it should be noted that the substance parts in all figures are shown significantly enlarged compared to their real size for drawing reasons.

Claims (7)

  1. Process for direct image formation on a forme cylinder (1, 11, 21, 31) by means of an image-adequate application of a substance, affecting the ink guiding, to parts of the forme cylinder surface by an image point transfer unit corresponding to digital image information, characterised in that
    - by the application of energy the image point transfer unit first of all transfers portions of the substance (8, 16, 28, 36) to a transfer belt (7, 14, 26, 34) in accordance with the image information;
    - the transfer belt (7, 14, 26, 34) is guided at least partially along the conventional path (3, 13, 23, 33) of a printing material web into the region of the forme cylinder (1, 11, 21, 31), and
    - the portions of the substance (8, 16, 28, 36) are delivered by a fresh application of energy, at least once, from the transfer belt (7, 14, 26, 34) to the forme cylinder (1, 11, 21, 31).
  2. Process according to claim 1, characterised in that the transfer belt (7, 34) is guided completely along the conventional path (3, 33) of a printing material web.
  3. Process according to claim 2, characterised in that the forme cylinder (1) is formed by an intaglio forme cylinder provided with a uniform basic cell matrix.
  4. Process according to claim 2, characterised in that the forme cylinder (1) is constructed as a dilitho forme cylinder.
  5. Process according to claim 2, characterised in that the forme cylinder (1) is designed as a screen-printing forme cylinder with a uniform mesh or aperture screen.
  6. Process according to at least one of claims 1 or 2, characterised in that the forme cylinder (31) of an offset printing machine is imaged by the interposition of a further transfer step, in which the portions of the substance (36) lying on the transfer belt (34) are transferred first of all under the effect of energy to a blanket cylinder (30) co-operating with the forme cylinder (31) and from there are delivered to the forme cylinder (31) by a fresh application of energy.
  7. Process according to claim 1, characterised in that in the path (23) of a printing material web in an offset-printing machine a deflector (24) is provided before a blanket cylinder is reached, from which deflector a printing material web is guided into the gap between the blanket cylinder (20) and a printing cylinder (22) cooperating with it, and from which a transfer belt (26) is guided in a branching route (25) into the gap between the forme cylinder (21) and the blanket cylinder (20).
EP89120428A 1988-11-09 1989-11-04 Process for direct image formation in printing cylinders Expired - Lifetime EP0368178B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837979 1988-11-09
DE3837979A DE3837979C2 (en) 1988-11-09 1988-11-09 Device for direct imaging of a printing form cylinder

Publications (3)

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EP0368178A2 EP0368178A2 (en) 1990-05-16
EP0368178A3 EP0368178A3 (en) 1990-11-28
EP0368178B1 true EP0368178B1 (en) 1993-07-14

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EP89120428A Expired - Lifetime EP0368178B1 (en) 1988-11-09 1989-11-04 Process for direct image formation in printing cylinders

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EP (1) EP0368178B1 (en)
JP (1) JP2801300B2 (en)
DE (3) DE3837979C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19508842B4 (en) * 1995-03-11 2005-11-24 Koenig & Bauer Ag Method for imaging a printing plate
JPH11139016A (en) * 1997-11-14 1999-05-25 Hitachi Koki Co Ltd Solid ink printing original plate, and its manufacture
JPH11139017A (en) * 1997-11-14 1999-05-25 Hitachi Koki Co Ltd Solid ink printing original plate, and its manufacture
BR112013022420B1 (en) * 2011-03-11 2020-12-01 Hewlett-Packard Development Company, L.P. media sheet nesting set, printer, and print alignment method

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE3248178C2 (en) * 1982-12-27 1987-02-19 Forschungsgesellschaft Druckmaschinen E.V., 6000 Frankfurt, De

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FR457270A (en) * 1913-04-30 1913-09-15 J Voirin Des Ets Method and device for the direct production of printing plates used in transfer machines on rubber or other plastics
US3299807A (en) * 1963-10-22 1967-01-24 Minnesota Mining & Mfg Direct imaging of offset plates
US3752076A (en) * 1971-03-12 1973-08-14 Olivetti & Co Spa Method for duplicating a preliminary copy
DE100778T1 (en) * 1982-08-10 1984-05-24 Mitsubishi Jukogyo K.K., Tokio/Tokyo DEVICE FOR AUTOMATICALLY REPLACING PRINTING PLATES.
DE3507418A1 (en) * 1985-03-02 1986-09-04 Basf Ag, 6700 Ludwigshafen METHOD FOR TRANSFERRING INFORMATION TO AN OFFSET PRINT PLATE
DE3636129A1 (en) * 1986-10-23 1988-05-05 Man Technologie Gmbh PRINT FORM FOR FLAT PRINTING
DE3809915A1 (en) * 1988-03-24 1989-10-05 Man Technologie Gmbh Method for transferring printing images in lithoprinting
DE4241601C2 (en) * 1992-12-10 2002-06-13 Koenig & Bauer Ag Method and device for the automatic insertion or removal of flexible printing plates

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Publication number Priority date Publication date Assignee Title
DE3248178C2 (en) * 1982-12-27 1987-02-19 Forschungsgesellschaft Druckmaschinen E.V., 6000 Frankfurt, De

Also Published As

Publication number Publication date
DE3837979A1 (en) 1990-05-10
DE3837979C2 (en) 1995-12-07
JPH02178044A (en) 1990-07-11
JP2801300B2 (en) 1998-09-21
EP0368178A2 (en) 1990-05-16
DE3844946C2 (en) 1997-05-15
EP0368178A3 (en) 1990-11-28
DE58904911D1 (en) 1993-08-19

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