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EP0078444B1 - Inking arrangement for offset printing machines - Google Patents

Inking arrangement for offset printing machines Download PDF

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Publication number
EP0078444B1
EP0078444B1 EP82109626A EP82109626A EP0078444B1 EP 0078444 B1 EP0078444 B1 EP 0078444B1 EP 82109626 A EP82109626 A EP 82109626A EP 82109626 A EP82109626 A EP 82109626A EP 0078444 B1 EP0078444 B1 EP 0078444B1
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EP
European Patent Office
Prior art keywords
roller
ink
inking
duct
plate cylinder
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
Application number
EP82109626A
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German (de)
French (fr)
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EP0078444A1 (en
Inventor
Willi Jeschke
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.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to DE8585101334T priority Critical patent/DE3279324D1/en
Publication of EP0078444A1 publication Critical patent/EP0078444A1/en
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Publication of EP0078444B1 publication Critical patent/EP0078444B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B41F7/04—Rotary lithographic machines for offset printing using printing units incorporating one forme cylinder, one transfer cylinder, and one impression cylinder, e.g. for printing on webs
    • B41F7/06—Rotary lithographic machines for offset printing using printing units incorporating one forme cylinder, one transfer cylinder, and one impression cylinder, e.g. for printing on webs for printing on sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices

Definitions

  • the invention relates to an inking unit for offset printing machines according to the preamble of claim 1 (DE-B-23 23 025).
  • an inking roller with an elastic surface is provided for inking the printing plate, the diameter of which is significantly smaller than that of the plate cylinder.
  • This inking roller is assigned an ink cylinder which receives the ink to be transferred from a metering roller, so that an ink film of a certain thickness is produced over the entire width.
  • the metering roller is driven at a lower speed than the ink cylinder, such that a change in the ink film thickness can be achieved due to the existing slip between the metering roller and transfer roller.
  • a dampening unit is associated with the known version of the applicator roller.
  • the rider rollers which are also assigned to the applicator roller and carry out a lateral rubbing movement, serve the purpose of achieving a more uniform color distribution after this additional effort for eliminating ghost images in the known embodiment is required.
  • So-called "short” inking units are already known, in which the split ink film returning from the plate is completely covered with a large amount of ink and then rebuilt by knife coating.
  • This type of inking unit includes the design according to DE-B-23 23 025.
  • the main disadvantage of this type is that the inking roller is exposed to high mechanical wear due to the doctor device.
  • the high peripheral speeds of modern offset printing machines mean that high temperatures occur on the doctor device - regardless of whether it is a doctor roller or a doctor edge.
  • an opposite direction of movement of the lateral surfaces of the doctor roller and the applicator roller and penetration of the doctor device into the ink application roller are necessary. If this causes damage to the inking roller, also due to the deposition of dirt particles at the squeegee point, markings in the print are inevitable.
  • Another disadvantage of the known design is that, despite a platen roller the size of a plate cylinder, it is not possible to dye without stenciling. For example, several small ink-guiding rollers are provided between the plate cylinder and applicator roller, which can cause stenciling. This danger is exacerbated by the fact that some of these rollers apply the dampening solution to the returning color profile of the printing plate.
  • the object of the invention is to provide an inking unit which, when using a maximum of two inking rollers, works without stenciling on the application roller and does not require any stenciling and ensures perfect, low-wear inking of the printing plate, so that printing jobs can be carried out in the highest quality and in which no stenciling can occur due to the necessary dampening of the offset plate.
  • the solution uses only two inking rollers and an ink cylinder, to which an ink metering device is assigned to produce a continuous, uniform ink film.
  • the diameter of the inking rollers is designed so that it corresponds to the plate cylinder diameter, so that stenciling is certainly prevented.
  • the arrangement of the dampening device on the first inking roller has the advantage that the continuous wet film is applied to a likewise continuous ink film, so that no stenciling can be caused by dampening rollers.
  • the solution according to claim 1 has the further advantage that the inking is intensified by the two application rollers, so that even difficult prints are easy to master. It is also ensured by the two application rollers, the plate cylinder diameter and by their distance from each other at a certain ink cylinder diameter that no stenciling occurs.
  • the dampening system is the first Applicator roller assigned, which ensures safe moistening of the printing plate.
  • the solution to the problem is a simple and inexpensive design of an offset printing unit, which meets all quality requirements of a modern machine design using only three inking rollers. Another advantage is that by rolling only two application rollers on the printing plate, the wear of the same is reduced.
  • FIG. 1 an offset printing unit for printing sheets is shown with a sheet system 1, with which the sheets are fed to a printing cylinder 2. On this cylinder they receive their imprint from a rubber cylinder 3. After printing, they are fed from a delivery system 4 to the delivery stack 5.
  • the rubber cylinder 3 interacts with a plate cylinder 6, to which two inking rollers 7, 7 'are assigned, the diameters of which almost correspond to the plate cylinder diameter.
  • the inking rollers 7, 7 ' have an elastic surface and transfer an absolutely uniform ink film of constant thickness to the printing areas of the printing plate of the plate cylinder 6.
  • the ink cylinder 8 is assigned an ink fountain 9 with an ink metering device 10 (not to be explained in more detail), which enables the ink film thickness on the ink cylinder 8 to be regulated.
  • the first inking roller 7 is assigned a dampening unit 11, which transfers the dampening solution from a dampening tank 12 via the dampening rollers 13, 14 to the inking roller 7.
  • the ink cylinder 8 can e.g. in the case of a large amount of paper dust, a device 20 which removes the color residual profile may be assigned.
  • the diameter of the inking rollers 7,7 'and the diameter of the ink cylinder 8 are designed almost equal to the plate cylinder diameter, it is sufficient to arrange the two inking rollers 7,7' at an angle of 90 ° to each other in order to surely stencil to prevent.
  • the ink cylinder 8 according to FIGS. 1 and 2 can equally well be made smaller in diameter.
  • the diameter of the ink cylinder 8 can thus be freely determined within the scope of the design options.
  • the color cylinders 8, 8 ' are formed with a hard, non-elastic surface.
  • the application rollers can thus be made thicker than the plate cylinder for regrinding up to approx. 1 mm in diameter.
  • Another advantage of the small differences in diameter is that a defect, e.g. on the outer surface of an application roller, migrates by a small amount on the circumference with each plate cylinder rotation and thus does not lead to punctual damage to the printing plate.
  • Fig. 2 differs from Fig. 1 in that seen on the inking roller 7 in the same direction of rotation, after the dampening unit 11 and before the transfer point to the plate cylinder 6, a friction roller 31 is provided, the rough chrome surface to improve the printing result leads without fear of stenciling.
  • an ink feed system with a larger number of rollers can also be used for difficult work with special inks or paper types. which are equivalent to a conventional inking unit part (Fig. 4).
  • These can be assigned to the ink cylinder 8 instead of the ink fountain 9 without difficulty.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Color Image Communication Systems (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Description

Die Erfindung bezieht sich auf ein Farbwerk für Offsetdruckmaschinen gemäß dem Oberbegriff des Anspruchs 1 (DE-B- 23 23 025).The invention relates to an inking unit for offset printing machines according to the preamble of claim 1 (DE-B-23 23 025).

Eines der Hauptkriterien beim Offsetdruck ist die schablonierfreie Einfärbung der Offsetplatte. Konventionelle Offsetfarbwerke erreichen dies mit einer Vielzahl von Farbwalzen, wobei am Plattenzylinder mindestens vier Farbauftragwalzen benötigt werden. Diese Bauart ist sehr aufwendig und kann ein Schablonieren, das ist eine Wiederabbildung von Störstellen der Druckform nach einer Umdrehung einer Auftragwalze, nicht hundertprozentig vermeiden.One of the main criteria in offset printing is the stencil-free coloring of the offset plate. Conventional offset inks achieve this with a large number of inking rollers, with at least four inking rollers being required on the plate cylinder. This type of construction is very complex and cannot completely avoid stenciling, which is the re-imaging of defects in the printing form after one rotation of an application roller.

Bei einem bekannten Farbwerk (EP-A- 00 28 420), ist zum Einfärben der Druckplatte eine Farbauftragwalze mit elastischer Oberfläche vorgesehen, deren Durchmesser deutlich kleiner als der des Plattenzylinders ist. Dieser Farbauftragwalze ist ein Farbzylinder zugeordnet, der die zu übertragende Farbe von einer Dosierwalze erhält, so daß über die ganze Breite ein Farbfilm von bestimmter Stärke erzeugt wird. Hierzu ist die Dosierwalze mit einer geringeren Geschwindigkeit als der Farbzylinder angetrieben, derart, daß durch den vorhandenen Schlupf zwischen Dosierwalze und Übertragwalze eine Veränderung der Farbfilmstärke erreicht werden kann. Außerdem ist bei der bekannten Ausführung der Auftragwalze ein Feuchtwerk zugeordnet. Die weiterhin der Auftragwalze zugeordneten Reiterwalzen, die eine seitliche Verreibbewegung ausführen, dienen dem Zweck, eine gleichmäßigere Farbverteilung zu erreichen, nachdem dieser zusätzliche Aufwand zur Beseitigung von Geisferbildern bei der bekannten Ausführung erforderlich ist.In a known inking unit (EP-A-00 28 420), an inking roller with an elastic surface is provided for inking the printing plate, the diameter of which is significantly smaller than that of the plate cylinder. This inking roller is assigned an ink cylinder which receives the ink to be transferred from a metering roller, so that an ink film of a certain thickness is produced over the entire width. For this purpose, the metering roller is driven at a lower speed than the ink cylinder, such that a change in the ink film thickness can be achieved due to the existing slip between the metering roller and transfer roller. In addition, a dampening unit is associated with the known version of the applicator roller. The rider rollers, which are also assigned to the applicator roller and carry out a lateral rubbing movement, serve the purpose of achieving a more uniform color distribution after this additional effort for eliminating ghost images in the known embodiment is required.

Der Nachteil der bekannten Ausführung ist, daß zum Einfärben der Druckplatte, ähnlich wie bei konventionellen Farbwerken, eine Vielzahl von Walzen in verschiedenartigster Ausführung erforderlich ist, die teilweise angetrieben werden und zusätzlich noch eine seitliche Hin- und Herbewegung ausführen. Neben dem erheblichen technischen Aufwand ist bei einem Farbwerk dieser Ausführung nicht auszuschließen, daß ein Schablonieren auf dem Druckbild sichtbar wird, denn durch den kleineren Durchmesser der Auftragwalze berührt eine bestimmte Stelle der Oberfläche bei jeder Umdrehung jeweils eine andere Stelle der Plattenzylinderoberfläche. Um jedoch auf der Auftragwalze vor dem Einfärben der Druckplatte einen absolut gleichmäßigen Farbfilm zu erzeugen, dürfte die Anzahl der Farbwerkswalzen und somit der Spaltstellen nicht ausreichen.The disadvantage of the known design is that for inking the printing plate, similarly to conventional inking units, a large number of rollers in various designs are required, some of which are driven and additionally perform a lateral back and forth movement. In addition to the considerable technical effort involved in an inking unit of this type, it cannot be ruled out that stenciling will become visible on the printed image, because the smaller diameter of the application roller causes a certain point on the surface to touch a different point on the plate cylinder surface with each revolution. However, in order to produce an absolutely uniform ink film on the applicator roller before inking the printing plate, the number of inking rollers and thus the nips should not be sufficient.

Es sind auch schon sogenannte "kurze" Farbwerke bekannt, bei denen der von der Platte rückkehrende gespaltene Farbfilm vollständig mit einer großen Farbmenge überdeckt und anschließend durch Rakelung neu aufgebaut wird. Zu dieser Gattung von Farbwerken gehört die Ausführung gemäß DE-B- 23 23 025. Der Hauptnachteil dieser Bauart besteht darin, daß die Farbauftragwalze einem hohen mechanischen Verschleiß durch die Rakelvorrichtung ausgesetzt ist. Die hohen Umfangsgeschwindigkeiten moderner Offsetdruckmaschinen führen dazu, daß an der Rakelvorrichtung - gleichgültig, ob es sich um eine Rakelwalze oder eine Rakelkante handelt - hohe Temperaturen entstehen. Weiterhin ist zur Erzeugung eines dünnen Farbfilms eine entgegengesetzte Bewegungsrichtung der Mantelflächen der Rakelwalze und der Auftragwalze und ein Eindringen der Rakelvorrichtung in die Farbauftragwalze notwendig. Kommt es dadurch zur Beschädigung der Farbauftragwalze, auch durch Ablagerung von Schmutzteilchen an der Rakelstelle, sind Markierungen im Druck unvermeidlich.So-called "short" inking units are already known, in which the split ink film returning from the plate is completely covered with a large amount of ink and then rebuilt by knife coating. This type of inking unit includes the design according to DE-B-23 23 025. The main disadvantage of this type is that the inking roller is exposed to high mechanical wear due to the doctor device. The high peripheral speeds of modern offset printing machines mean that high temperatures occur on the doctor device - regardless of whether it is a doctor roller or a doctor edge. Furthermore, in order to produce a thin ink film, an opposite direction of movement of the lateral surfaces of the doctor roller and the applicator roller and penetration of the doctor device into the ink application roller are necessary. If this causes damage to the inking roller, also due to the deposition of dirt particles at the squeegee point, markings in the print are inevitable.

Ein weiterer Nachteil der bekannten Ausführung ist dadurch gegeben, daß trotz einer plattenzylindergroßen Auftragwalze kein schablonierfreies Einfärben möglich ist. So sind zwischen Plattenzylinder und Auftragwalze mehrere kleine farbführende Walzen vorgesehen, die ein Schablonieren verursachen können. Verstärkt wird diese Gefahr noch dadurch daß ein Teil dieser Walzen das Feuchtmittel auf das zurückkehrende Farbprofil der Druckplatte aufbringen.Another disadvantage of the known design is that, despite a platen roller the size of a plate cylinder, it is not possible to dye without stenciling. For example, several small ink-guiding rollers are provided between the plate cylinder and applicator roller, which can cause stenciling. This danger is exacerbated by the fact that some of these rollers apply the dampening solution to the returning color profile of the printing plate.

Die Aufgabe der Erfindung ist es, ein Farbwerk zu schaffen, das bei Verwendung von höchstens zwei Farbauftragwalzen, ohne Abrakelung an der Auftragwalze absolut schablonierfrei arbeitet und eine einwandfreie ver-schleißarme Einfärbung der Druckplatte gewährleistet, so daß auch Druckaufträge in höchster Qualität ausgeführt werden können und bei dem auch durch die notwendige Feuchtung der Offsetplatte kein Schablonieren entstehen kann.The object of the invention is to provide an inking unit which, when using a maximum of two inking rollers, works without stenciling on the application roller and does not require any stenciling and ensures perfect, low-wear inking of the printing plate, so that printing jobs can be carried out in the highest quality and in which no stenciling can occur due to the necessary dampening of the offset plate.

Die gestellte Aufgabe läßt sich gemäß dem Kennzeichen des Anspruchs 1 lösen.The task can be solved according to the characterizing part of claim 1.

Die Lösung verwendet lediglich zweiFarbauftragwalzen und einen Farbzylinder, dem eine Farbdosiereinrichtung zur Erzeugung eines kontinuierlichen, gleich-mäßigen Farbfilms zugeordnet ist.The solution uses only two inking rollers and an ink cylinder, to which an ink metering device is assigned to produce a continuous, uniform ink film.

Außerdem ist der Durchmesser der Farbauftragwalzen so ausgelegt, daß er dem Plattenzylinderdurchmesser entspricht, so daß mit Sicherheit ein Schablonieren verhindert wird. Die Anordnung der Feuchteinrichtung an der ersten Farbauftragwalze hat den Vorteil, daß der kontinuierliche Feuchtfilm auf einen ebenfalls kontinuierlichen Farbfilm aufgebracht wird, so daß auch durch Feuchtwerkswalzen kein Schablonieren verursacht werden kann.In addition, the diameter of the inking rollers is designed so that it corresponds to the plate cylinder diameter, so that stenciling is certainly prevented. The arrangement of the dampening device on the first inking roller has the advantage that the continuous wet film is applied to a likewise continuous ink film, so that no stenciling can be caused by dampening rollers.

Die Lösung gemäß Anspruch 1 hat den weiteren Vorteil, daß durch die beiden - Auftragwalzen die Einfärbung verstärkt wird, so daß auch schwierige Drucke einfach zu beherrschen sind. Auch ist durch die beiden Auftragwalzen, die Plattenzylinderdurchmesser auf weisen und durch deren Abstand voneinander bei bestimmtem Farbzylinderdurchmesser gewährleistet, daß kein Schablonieren auftritt. Hierbei ist das Feuchtwerk der ersten Auftragwalze zugeordnet, was ein sicheres Einfeuchten der Druckplatte gewährleistet. Somit stellt die Lösung der gestellten Aufgabe gemäß Anspruch 1 eine einfache und kostengünstige Ausbildung eines Offsetdruckwerkes dar, die bei Verwendung von nur drei Farbwerkswalzen allen Qualitätsanforderungen einer modernen Maschinenkonzeption gerecht wird. Ein weiterer Vorteil besteht darin, daß durch das Abwälzen von nur zwei Auftragwalzen auf der Druckplatte der Verschleiß derselben verringert wird.The solution according to claim 1 has the further advantage that the inking is intensified by the two application rollers, so that even difficult prints are easy to master. It is also ensured by the two application rollers, the plate cylinder diameter and by their distance from each other at a certain ink cylinder diameter that no stenciling occurs. The dampening system is the first Applicator roller assigned, which ensures safe moistening of the printing plate. Thus, the solution to the problem is a simple and inexpensive design of an offset printing unit, which meets all quality requirements of a modern machine design using only three inking rollers. Another advantage is that by rolling only two application rollers on the printing plate, the wear of the same is reduced.

Die Merkmale der Unteransprüche beziehen sich auf vorteilhafte Ausgestaltungen der erfindungsgemäßen Lösung. Eine zusätzliche Reibwalze mit einer rauhen Chrommantelfläche an der in Drehrichtung des Plattenzylinders gesehen ersten Auftragwalze verbessert das Einarbeiten des Feuchtmittels in die Farbschicht der Auftragwalze.The features of the subclaims relate to advantageous configurations of the solution according to the invention. An additional rubbing roller with a rough chrome surface on the first applicator roller seen in the direction of rotation of the plate cylinder improves the incorporation of the dampening solution into the ink layer of the applicator roller.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen schematisch dargestellt. Es zeigt:

  • Fig. 1 ein Farbwerk mit zwei Auftragwalzen,
  • Fig. 2 ein Farbwerk mit zwei Auftragwalzen gemäß Anspruch 1,
  • Fig. 3 eine Seitenansicht eines Walzenschemas gemäß Fig. 1,
  • Fig. 4 ein Farbwerk mit zwei Auftragwalzen und einem speziellen Farbzuführsystem.
Embodiments of the invention are shown schematically in the drawings. It shows:
  • 1 is an inking unit with two applicator rollers,
  • 2 an inking unit with two applicator rollers according to claim 1,
  • 3 is a side view of a roll scheme according to FIG. 1,
  • Fig. 4 is an inking unit with two applicator rollers and a special ink feed system.

In Fig. 1 ist ein Offsetdruckwerk zum Bedrucken von Bogen wiedergegeben mit einer Bogenanlage 1, mit der die Bogen einem Druckzylinder 2 zugeführt werden. Auf diesem Zylinder erhalten sie von einem Gummizylinder 3 ihren Aufdruck. Nach dem Bedrucken werden sie von einem Auslegesystem 4 dem Ablegestapel 5 zugeführt.In Fig. 1, an offset printing unit for printing sheets is shown with a sheet system 1, with which the sheets are fed to a printing cylinder 2. On this cylinder they receive their imprint from a rubber cylinder 3. After printing, they are fed from a delivery system 4 to the delivery stack 5.

Der Gummizylinder 3 wirkt mit einem Plattenzylinder 6 zusammen, dem zwei Farbauftragwalzen 7,7' zugeordnet sind, deren Durchmesser nahezu dem Plattenzylinderdurchmesser entsprechen. Die Farbauftragwalzen 7,7' weisen eine elastische Oberfläche auf und übertragen einen absolut gleichmäßigen Farbfilm konstanter Dicke auf die druckenden Stellen der Druckplatte des Plattenzylinders 6.The rubber cylinder 3 interacts with a plate cylinder 6, to which two inking rollers 7, 7 'are assigned, the diameters of which almost correspond to the plate cylinder diameter. The inking rollers 7, 7 'have an elastic surface and transfer an absolutely uniform ink film of constant thickness to the printing areas of the printing plate of the plate cylinder 6.

Den Farbauftragwalzen 7,7' ist ein Farbzylinder 8 zugeordnet, dessen Durchmesser kleiner gewählt wurde. Dem Farbzylinder 8 ist ein Farbkasten 9 mit einer nicht näher zu erläuternden Farbdosiereinrichtung 10 zugeordnet, die eine Regulierung der Farbfilmstärke auf dem Farbzylinder 8 ermöglicht. Weiterhin ist der in Drehrichtung des Plattenzylinders gesehen, ersten Farbauftragwalze 7 ein Feuchtwerk 11 zugeordnet, das das Feuchtmittel aus einem Feuchtbehälter 12 über die Feuchtwalzen 13, 14 auf die Farbauftragwalze 7 überträgt. Dem Farbzylinder 8 kann, z.B. bei hohem Papierstaubanfall, eine das Farbrestprofil entfernende Einrichtung 20 zugeordnet sein.The inking rollers 7, 7 'are assigned an ink cylinder 8, the diameter of which has been chosen smaller. The ink cylinder 8 is assigned an ink fountain 9 with an ink metering device 10 (not to be explained in more detail), which enables the ink film thickness on the ink cylinder 8 to be regulated. Furthermore, seen in the direction of rotation of the plate cylinder, the first inking roller 7 is assigned a dampening unit 11, which transfers the dampening solution from a dampening tank 12 via the dampening rollers 13, 14 to the inking roller 7. The ink cylinder 8 can e.g. in the case of a large amount of paper dust, a device 20 which removes the color residual profile may be assigned.

Werden gemäß Fig. 2 die Durchmesser der Farbauftragwalzen 7,7' und der Durchmesser des Farbzylinders 8 nahezu gleich dem Plattenzylinderdurchmesser ausgelegt, so genügt es, die beiden Farbauftragwalzen 7,7' in einem Winkel von 90° zueinander anzuordnen, um mit Sicherheit ein Schablonieren zu verhindern. Genausogut kann aber auch der Farbzylinder 8 gemäß Fig. 1 und 2im Durchmesser kleiner ausgelegt werden.2, the diameter of the inking rollers 7,7 'and the diameter of the ink cylinder 8 are designed almost equal to the plate cylinder diameter, it is sufficient to arrange the two inking rollers 7,7' at an angle of 90 ° to each other in order to surely stencil to prevent. However, the ink cylinder 8 according to FIGS. 1 and 2 can equally well be made smaller in diameter.

Nimmt man eine Störstelle in der Zentrale zwischen Plattenzylinder 6 und Farbauftragwalze 7 bei 16 an, so muß diese die Bogenlänge 11 am Umfang des Plattenzylinders 6 bis zur Kontaktstelle 17 der zweiten Auftragwalze 7' und an deren Umfang bis zur Kontaktsteile 18 zum Farbzylinder 8 und an dessen Umfang bis zur Kontaktstelle 19 zur Farbauftragwalze 7 zurücklegen, wobei diese Länge gleich sein muß der Bogenlänge 12 von der Kontaktstelle 16 zwischen Plattenzylinder 6 und Farbauftragwalze 7 bis zur Kontaktstelle 19 zwischen . Farbauftragwalze 7 und Farbzylinder 8 plus dem Umfang einer Farbauftragwalze. In diesem Falle wird die Störstelle bei der Kontaktstelle 16 zwischen Farbauftragwalze 7 und Farbzylinder 8 mit der Störstelle zusammentreffen, die die Bogenlänge gemäß 1 , zurückgelegt hat, allerdings um genau eine Umdrehung versetzt. Die dazugehörenden Winkel lassen sich errechnen.Wird z.B. R2 halb so groß wie R1 gewählt, so ergeben sich die für den Winkel a = 42,24° und für den Winkel β = 63,67°. Im Rahmen der konstruktiven Möglichkeiten läßt sich somit der Durchmesser des Farbzylinders 8 frei festlegen.Assuming a point of failure in the center between plate cylinder 6 and inking roller 7 at 16, this must have the arc length 11 on the circumference of the plate cylinder 6 up to the contact point 17 of the second application roller 7 'and on its circumference up to the contact parts 18 to the ink cylinder 8 and cover its circumference to the contact point 19 to the inking roller 7, this length must be equal to the arc length 1 2 from the contact point 16 between the plate cylinder 6 and the inking roller 7 to the contact point 19 between. Ink roller 7 and ink cylinder 8 plus the circumference of an ink roller. In this case, the defect at the contact point 16 between the inking roller 7 and the ink cylinder 8 will meet the defect that has covered the sheet length according to FIG. 1, but offset by exactly one revolution. The associated angles can be calculated. If, for example, R 2 is chosen to be half the size of R 1 , the result is for the angle a = 42.24 ° and for the angle β = 63.67 °. The diameter of the ink cylinder 8 can thus be freely determined within the scope of the design options.

In dem gezeigten Ausführungsbeispiel gemäß Fig. 1 bis 4 sind die Farbzylinder 8,8' mit einer harten, nicht elastischen Oberfläche ausgebildet. Die Farbauftragwalzen 7,7' sind mit einer elastischen Oberfläche versehen und werden im Normalfali nicht separat angetrieben. Es genügt hierbei, daß die Farbauftragwalzen nur nahezu den Plattenzylinderdurchmesser aufweisen, denn ein Schablonieren ist nur bei einer Störstellenverlagerung von ca. 3 mm und mehr sichtbar. Die Auftragwaizen können somit zum späteren Nachschleifen bis ca. 1 mm im Durchmesser dicker ausgeführt werden als der Plattenzylinder. Ein weiterer Vorteil der geringen Durchmesserunterschiede besteht darin, daß eine Störstelle, z.B. ander Mantelfläche einer Auftragwalze, bei jeder Plattenzylinderumdrehung um einen kleinen Betrag am Umfang wandert und somit nicht zu einer punktuellen Beschädigung der Druckplatte führt.In the exemplary embodiment shown in FIGS. 1 to 4, the color cylinders 8, 8 'are formed with a hard, non-elastic surface. The inking rollers 7,7 'are provided with an elastic surface and are normally not driven separately. It is sufficient here that the inking rollers only have almost the plate cylinder diameter, because stenciling is only visible when there is a misalignment shift of approx. 3 mm and more. The application rollers can thus be made thicker than the plate cylinder for regrinding up to approx. 1 mm in diameter. Another advantage of the small differences in diameter is that a defect, e.g. on the outer surface of an application roller, migrates by a small amount on the circumference with each plate cylinder rotation and thus does not lead to punctual damage to the printing plate.

Die in Fig. 2 gezeigte Ausführung unterscheidet sich von Fig. 1 dadurch, daß an der Farbauftragwalze 7 in Drehrichtung derselben gesehen, nach dem Feuchtwerk 11 und vor der Übertragungsstelle zum Plattenzylinder 6 eine Reibwalze 31 vorgesehen ist, deren rauhe Chrommantelfläche zu einer Verbesserung des Druckergebnisses führt, ohne daß hierdurch ein Schablonieren zu befürchten ist.The embodiment shown in Fig. 2 differs from Fig. 1 in that seen on the inking roller 7 in the same direction of rotation, after the dampening unit 11 and before the transfer point to the plate cylinder 6, a friction roller 31 is provided, the rough chrome surface to improve the printing result leads without fear of stenciling.

Wird ein eigener Antrieb für die Farbauftragwalzen 7,7' vorgesehen, könnendiese in bekannter Weise mit einem Gummituch bespannt werden, wobei der Zylinderkanal für die Spanneinrichtung des Gummituches mit dem Kanal für die Plattenspanneinrichtung am Plattenzylinder 6 zusammentrifft.If a separate drive is provided for the inking rollers 7, 7 ', these can be done in a known manner with a rubber blanket are covered, the cylinder channel for the tensioning device of the rubber blanket meeting the channel for the plate tensioning device on the plate cylinder 6.

Anstelle der in den Fig. 1 bis 3 gezeigten Farbzuführsystemen, bestehend aus dem Farbkasten 9 und der Farbdosiereinrichtung 10, die einen Farbfilm durch Abrakelung kontinuierlich neu aufbauen, ist für schwierige Arbeiten mit speziellen Farben oder Papiersorten auch ein Farbzuführsystem mit einer größeren Anzahl Walzen einsetzbar, die einem konventionelien Farbwerksteil gleichkommen (Fig. 4). Diese können ohne Schwierigkeiten dem Farbzylinder 8 anstelle des Farbkastens 9 zugeordnet werden. Es kann sich hierbei z.B. um drei Farbwalzen 21, 22, 23 handeln, die mit zwei Reibwalzen 24, 25 zusammenwirken, denen wiederum eine Übertragwalze 26 zugeordnet ist, wobei die Reibwalze 24 die Farbe über eine Hebwalze 27 von einer Farbkastenwalze 28 zugeführt bekommt, der ein Farbkasten 29 zugeordnet ist. Die Vorteile des Erfindungsgegenstandes bleiben auch bei dieser Ausgestaltung erhalten, denn es sind dem Plattenzylinder 6 ebenfalls nur zwei Auftragwalzen 7,7' zugeordnet, die ohne Schablonieren einfärben und hierbei die Druckplatte durch ihre geringere Anzahl von Abrollkontakten schonen.Instead of the ink feed systems shown in FIGS. 1 to 3, consisting of the ink fountain 9 and the ink metering device 10, which continuously rebuild an ink film by doctoring, an ink feed system with a larger number of rollers can also be used for difficult work with special inks or paper types. which are equivalent to a conventional inking unit part (Fig. 4). These can be assigned to the ink cylinder 8 instead of the ink fountain 9 without difficulty. For example, are three inking rollers 21, 22, 23, which cooperate with two distribution rollers 24, 25, which in turn are associated with a transfer roller 26, the distribution roller 24 receiving the ink via a lifting roller 27 from an ink fountain roller 28 to which an ink fountain 29 is assigned . The advantages of the subject matter of the invention are retained even in this embodiment, because there are also only two application rollers 7, 7 'assigned to the plate cylinder 6, which dye without stenciling and thereby protect the printing plate due to its smaller number of rolling contacts.

Claims (7)

1. Inking unit for offset printing presses for the printing of sheets or webs with a plate cylinder, said plate cylinder receiving the necessary ink from a forme roller, said forme roller having an elastic surface and exhibiting the same diameter as the plate cylinder and interacting with a duct roller to which the ink is fed via an ink-feeding system,
wherein -
the duct roller (8) is assigned an ink-feeding system which produces a continuous ink film, and wherein the duct roller (8) is followed by two forme rollers (7, 7') of virtually identical diameter as the plate cylinder (6), said forme rollers interacting with the plate cylinder (6), and wherein the sum of the sheet lengths (11) as viewed in the direction of rotation, from the contact point (26) of the plate cylinder (6) with the first inking roller (7) as far as the contact point (17) of the second inking roller (7'), from the latter along the circumference of the second inking roller (7') as far as the contact point (18) with the duct roller (8) and along the circumference of the latter as far as the contact point (19) with the first inking roller (7), is identical with the sheet length (12) on the first inking roller (7) from the contact point (16) with the plate cylinder (6) as far as the contact point (19) with the duct roller (8) plus the circumference of an inking roller (7), and wherein, as viewed in the direction of rotation of the plate cylinder (6), the first forme roller (7) is assigned a damping unit (11) with at least one roller (14) transferring the damping solution, and wherein the transfer of the damping solution onto the forme roller (7) takes place, as viewed in the direction of rotation of the latter, before its contact point (16) with the plate cylinder (6) and after its contact point (19) with the duct roller (8).
2. Inking unit according to Claim 1,
wherein
the duct roller (8) exhibits a hard, non-elastic surface.
3. Inking unit according to Claim 1,

wherein the duct roller (8) is assigned an ink-feeding system, consisting of an ink duct (9), with an ink-metering device (10).
4. Inking unit according to Claim 1,
wherein
the duct roller (8) is, as viewed in the direction of rotation of the latter before the ink duct (9), assigned a device (20) to remove the residual ink profile.
5. Inking unit according to Claim 1,
wherein
the first forme roller (7) is, as viewed in the direction of rotation of the latter, assigned before the plate cylinder (6) a distributor roller (31) with a rough chrome outer cylindrical surface.
6. Inking unit according to Claim 1,
wherein
the forme rollers (7, 7') are, like a printing-unit cylinder, dressed with a rubber blanket, which is clamped through clamping devices in a cylinder duct on the forme roller (7), and are driven at the same speed as the plate cylinder (6).
7. Inking unit according to Claim 1,
wherein
the duct roller (8) is assigned an ink-feeding system, consisting of three ink rollers (21, 22, 23), two distributor rollers (24, 25), one transfer roller (26), one vibrator (27) and one ink-duct roller (28) with ink duct (29).
EP82109626A 1981-10-31 1982-10-19 Inking arrangement for offset printing machines Expired EP0078444B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8585101334T DE3279324D1 (en) 1981-10-31 1982-10-19 Inking arrangement for offset printing machines

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3143314 1981-10-31
DE3143314 1981-10-31
DE3232780A DE3232780C2 (en) 1981-10-31 1982-09-03 Inking unit for offset printing machines
DE3232780 1982-09-03

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP85101334.2 Division-Into 1982-10-19

Publications (2)

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EP0078444A1 EP0078444A1 (en) 1983-05-11
EP0078444B1 true EP0078444B1 (en) 1986-03-19

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ID=25797014

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EP85101334A Expired EP0159474B1 (en) 1981-10-31 1982-10-19 Inking arrangement for offset printing machines
EP82109626A Expired EP0078444B1 (en) 1981-10-31 1982-10-19 Inking arrangement for offset printing machines

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EP85101334A Expired EP0159474B1 (en) 1981-10-31 1982-10-19 Inking arrangement for offset printing machines

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US (1) US4573407A (en)
EP (2) EP0159474B1 (en)
AT (1) AT384996B (en)
AU (1) AU562988B2 (en)
CA (1) CA1208489A (en)
DE (3) DE3232780C2 (en)
DK (1) DK467382A (en)
ES (1) ES8307591A1 (en)
NO (1) NO159360C (en)

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DE102017202384A1 (en) 2017-02-15 2018-08-16 Kba-Metalprint Gmbh Method for printing hollow bodies
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DE102018121540A1 (en) 2018-09-04 2020-03-05 Koenig & Bauer Ag Device for printing on hollow bodies
DE102018121542B4 (en) 2018-09-04 2022-03-17 Koenig & Bauer Ag Device for printing hollow bodies

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Also Published As

Publication number Publication date
EP0159474A1 (en) 1985-10-30
AU9000182A (en) 1983-05-05
DE3270008D1 (en) 1986-04-24
DK467382A (en) 1983-05-01
NO823608L (en) 1983-05-02
ES516981A0 (en) 1983-08-01
DE3232780C2 (en) 1986-02-06
EP0078444A1 (en) 1983-05-11
AT384996B (en) 1988-02-10
NO159360C (en) 1988-12-21
DE3232780A1 (en) 1983-05-11
ATA353882A (en) 1987-07-15
DE3279324D1 (en) 1989-02-09
NO159360B (en) 1988-09-12
ES8307591A1 (en) 1983-08-01
AU562988B2 (en) 1987-06-25
CA1208489A (en) 1986-07-29
US4573407A (en) 1986-03-04
EP0159474B1 (en) 1989-01-04

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