EP0131186B1 - Ink metering device in offset printing machines - Google Patents

Ink metering device in offset printing machines Download PDF

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Publication number
EP0131186B1
EP0131186B1 EP84107144A EP84107144A EP0131186B1 EP 0131186 B1 EP0131186 B1 EP 0131186B1 EP 84107144 A EP84107144 A EP 84107144A EP 84107144 A EP84107144 A EP 84107144A EP 0131186 B1 EP0131186 B1 EP 0131186B1
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EP
European Patent Office
Prior art keywords
pressure
ink
cylinder
metering
pressure medium
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Expired
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EP84107144A
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German (de)
French (fr)
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EP0131186A2 (en
EP0131186A3 (en
Inventor
Hugo Rambausek
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication of EP0131186A2 publication Critical patent/EP0131186A2/en
Publication of EP0131186A3 publication Critical patent/EP0131186A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices

Definitions

  • the invention relates to a device for dosing the paint according to the preamble of claim 1.
  • the object of the invention is to provide a device for metering the ink, in which a different width or zone-wise also in the circumferential direction of the plate cylinder in accordance with the required amount of ink Color profile is applied so that the color layer thickness is modulated in the circumferential direction, ie that the color layer can be varied not only in width but also in the circumferential direction according to the need.
  • the main advantage of the invention is the fact that it is possible with the given extremely short ink paths to the plate cylinder by using one or two application rollers, even in the circumferential direction to perform a modulation of the ink layer thickness of the plate cylinder, which in accordance with the ink requirement of the printed image delivers exactly the amount of ink that is required in the respective area.
  • FIG. 1 schematically shows an offset printing machine in which the sheets to be printed are fed in a known manner via a feeder 1 to a printing cylinder 2 which interacts with a blanket cylinder 3 and a plate cylinder 4.
  • the print image is thus transferred from the plate cylinder 4 via the rubber cylinder 3 to the sheet to be printed on the printing cylinder 2.
  • the sheet is fed from a chain delivery 5 to a delivery stack 6. For printing on a paper web, this would be passed between the impression cylinder 2 and the blanket cylinder 3 in a known manner.
  • the plate cylinder 4 is assigned an inking roller 7, which has an elastic jacket surface and whose diameter corresponds to the plate cylinder diameter.
  • the inking roller 7 receives the ink from an ink cylinder 8, the material with a lateral surface, for. B. metal.
  • a dampening unit 9 transfers the dampening solution via the two application rollers 10 and 11 to the ink cylinder 8, the last application roller 11, viewed in the direction of rotation of the ink cylinder, being pivotably mounted on the plate cylinder 4 for faster moistening (shown in dashed lines).
  • the ink cylinder 8 is assigned a metering body 12, which is supported on a crossmember 13, which is fastened to the side frames, via a ball joint 14 and via an adjusting element in the form of a pressure medium cylinder 15.
  • the ink supply 16 is located in the gap between the ink cylinder 8 and the metering body 12.
  • sensors 17 are provided which measure the layer thickness of the ink on the ink cylinder 8.
  • a further cross member 18 is provided, on which a support body 19 is supported.
  • Pressure medium cylinders 20 and ball joints 21, which exert the same pressure as the opposite pressure medium cylinders 15, are also provided between the support body 19 and the cross member 18, so that the pressure forces acting on the ink cylinder 8 cancel each other out. This prevents the same from bending.
  • the ink cylinder 8 has a chamber 22 in its interior, which can be filled with a cooling liquid.
  • FIG. 2 shows an ink metering device according to FIG. 1 in a partial longitudinal section, with the ink cylinder 8 being supported by roller bearings 23 in the machine side frames 24, 25.
  • the jacket 26 of the ink cylinder 8 lies on the end faces of sealing jaws 27 for the ink. These in turn are attached to the trusses 13 and 18.
  • the chamber 22 is connected via the bore 28 to a coolant circuit, not shown.
  • the pressure medium cylinders 15 are connected via a pressure medium line 29 to a pressure reducing valve 30 which is connected to a hydraulic unit 32 via a further line 31.
  • the hydraulic unit 32 generates a pressure as high as is required for the maximum demands on the metering body 12.
  • Via the pressure reducing valve 30, the pressure is reduced as far as is necessary for the respective need. This reduction can be done uniformly or differently across zones across the machine width.
  • To change the reduced pressure over time serves z.
  • a plunger 33 the excitation of which is controlled by an amplifier 34 from a signal recorded on the disc 37 or an endless tape.
  • the disc contains information about the amount of color required for the subject to be printed.
  • the signal on the disk 37 can be predetermined after a subjective assessment of the printing form or determined by a scanner.
  • the regulation of the pressure reducing valve 30 can take place both analog and digital.
  • other control elements for the pressure change are also possible. So z. B. the change in the spring preload of the pressure reducing valve via a rotating at machine speed, the subject associated control disc an example of a simple mechanical solution.
  • a paper web 35 is shown below in FIG. 4, which has imprints 36 in close succession.
  • the paper web 35 moves to the right, and the prints are each provided on the right side with a hatched area, which is intended to indicate increased ink consumption.
  • the prints in the running direction of the web are shown on the abscissa and the amount of ink required in each case on the ordinate.
  • the ink supply is reduced and increased in each case in the hatched area.
  • the amount of ink supplied can be regulated in this direction in accordance with the respective consumption.
  • the condition for this ink metering is that there is a short ink path to the plate cylinder and that the inking roller corresponds to the plate cylinder diameter, so that the color relief is always generated at the same point on the outer surface.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

1. Device for metering the amount of ink in an offset printing machine having an ink cylinder (8) and an ink applicator roller (7) the diameter of which corresponds to the diameter of the plate cylinder, said ink cylinder (8) having an outer cylindrical surface formed of rigid material, at least one metering body (12) being engageable with said ink cylinder (8) under a given pressure, said metering body having a metering surface extending axially parallel with and tangentially to said outer cylindrical surface of said ink cylinder (8), a stationary bearing (13) supporting said metering body through the intermediary of an adjusting element (15) responsive to a pressure medium, wherein, for engagement of said metering body (12), the pressure-medium supplying system for said adjusting elements (15) responsive to a pressure medium includes an additional device (33) for varying the pressure of a pressure medium in timed coordination with the respective ink consumption within a printing period.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Dosieren der Farbe gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for dosing the paint according to the preamble of claim 1.

Mit der Anmeldung EP-A-0 093 879 wird eine Farbdosiereinrichtung geschaffen, die eine absolut gleichmäßige und reproduzierbare Farbzufuhr bei Offsetdruckmaschinen und mit geringem Aufwand eine exakte Regelung der Einfärbung des Plattenzylinders gewährleistet. Hiermit ist es möglich, einen gleichmäßig dicken Farbfilm der Druckform zuzuführen oder über die Breite der Druckform eine zonal unterschiedliche Farbzufuhr zu erreichen. Die zugeführte Farbmenge entspricht zwar dem pro Farbzone unterschiedlichen Verbrauch während der gesamten Druckperiode, aber nicht der je nach Sujet des Druckerzeugnisses innerhalb einer Druckperiode zeitlich unterschiedlich momentan benötigten Menge.With the application EP-A-0 093 879 a color metering device is created which guarantees an absolutely uniform and reproducible ink supply in offset printing machines and with little effort an exact regulation of the coloring of the plate cylinder. This makes it possible to feed a uniformly thick ink film to the printing form or to achieve a zonally different ink supply across the width of the printing form. The amount of ink supplied corresponds to the different consumption per ink zone during the entire printing period, but not to the amount of time required at different times within a printing period depending on the subject of the printed product.

Bei einer zonenweisen Regelung der Farbe werden unterschiedlich dicke Farbstreifen dem Plattenzylinder zugeführt, die sich in Umfangsrichtung der Platte nicht verändern. In der Praxis kommt es aber häufiger vor, daß das zu druckende Bild nicht nur in der Breite zonenweise verschiedene Farbmengen benötigt, sondern daß auch, in Umfangsrichtung des Plattenzylinders gesehen, Bereiche gegeben sind, die mehr oder weniger Farbe benötigen. Dies ist z. B. dann der Fall, wenn bei einem Bild der obere Bereich intensiv blau bedruckt wird. Keine Farbe wird z. B. momentan benötigt, wenn der Plattenzylinderspannkanal die Farbauftragsstelle passiert.In a zone-by-zone regulation of the color, differently thick color strips are fed to the plate cylinder, which do not change in the circumferential direction of the plate. In practice, however, it is more common that the image to be printed not only requires different amounts of color in terms of width, but also that, viewed in the circumferential direction of the plate cylinder, there are areas which require more or less color. This is e.g. B. the case when the upper area of an image is printed intensively blue. No color is e.g. B. currently required when the plate cylinder clamping channel passes the ink application point.

Bei einem Farbwerk mit sehr vielen Farbwerkswalzen und somit mehrfach gesplittetem Farbfluss ist die Berücksichtigung eines derartig unterschiedlichen Farbverbrauchs nicht möglich.In the case of an inking unit with a large number of inking unit rollers and thus multiple-split ink flow, it is not possible to take into account such a different ink consumption.

Ausgehend von einem Farbwerk mit einer oder zwei Auftragwalzen, deren Durchmesser dem Plattenzylinderdurchmesser entspricht, ist die Aufgabe der Erfindung, eine Vorrichtung zum Dosieren der Farbe zu schaffen, bei der auch in Umfangsrichtung des Plattenzylinders entsprechend der benötigten Farbmenge über die ganze Breite oder zonenweise ein unterschiedliches Farbprofil aufgebracht wird, so daß die Farbschicktdicke in Umfangsrichtung moduliert wird, d.h. daß die Farbschicht nicht nur in der Breite sondern auch in Umfangsrichtung entsprechend dem Bedarf variiert werden kann.Starting from an inking unit with one or two applicator rollers, the diameter of which corresponds to the plate cylinder diameter, the object of the invention is to provide a device for metering the ink, in which a different width or zone-wise also in the circumferential direction of the plate cylinder in accordance with the required amount of ink Color profile is applied so that the color layer thickness is modulated in the circumferential direction, ie that the color layer can be varied not only in width but also in the circumferential direction according to the need.

Gemäß der Erfindung erfolgt die Lösung der gestellten Aufgabe durch die Merkmale des Anspruchs 1. Der wesentliche Vorteil der Erfindung ist darin zu sehen, daß es bei den gegebenen extrem kurzen Farbwegen zum Plattenzylinder durch die Verwendung von einer oder zwei Auftragwalzen möglich ist, auch in Umfangsrichtung des Plattenzylinders eine Modulation der Farbschichtdicke vorzunehmen, die entsprechend dem Farbbedarf des Druckbildes genau die Menge Farbe liefert, die in dem jeweiligen Bereich benötigt wird. Mit der geschaffenen Lösung ist es somit möglich, einen gleichmäßig dicken Farbfilm über die gesamte Druckfläche zu erzeugen, uber die Breite oder den Umfang der Druckform ein bestimmtes Farbprofil zu schaffen oder eine reliefartige Regelung in beiden Ausdehnungen durchzuführen, so daß auch kleine Teilflächen auf der Druckform gezielt mit der benötigten Farbe versorgt werden können.According to the invention, the object is achieved by the features of claim 1. The main advantage of the invention is the fact that it is possible with the given extremely short ink paths to the plate cylinder by using one or two application rollers, even in the circumferential direction to perform a modulation of the ink layer thickness of the plate cylinder, which in accordance with the ink requirement of the printed image delivers exactly the amount of ink that is required in the respective area. With the solution created, it is thus possible to produce a uniformly thick ink film over the entire printing area, to create a specific color profile over the width or the circumference of the printing form, or to carry out a relief-like regulation in both dimensions, so that even small partial areas on the printing form can be specifically supplied with the required color.

Die Unteransprüche beinhalten vorteilhafte Ausgestaltungen der Erfindung und ermöglichen die Lösung der gestellten Aufgabe mit einem nur geringen Zusatzaufwand an Steuermitteln.The subclaims contain advantageous refinements of the invention and enable the problem to be solved with only a small additional outlay on control means.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen schematisch dargestellt. Es zeigt:

  • Fig. 1 eine Seitenansicht eines Offsetdruckwerkes mit einer Farbdosiereinrichtung gemäß EP-A-0 093 879,
  • Fig. 2 einen Längsschnitt durch die Farbdosiereinrichtung,
  • Fig. 3 einen Steuerplan für die Stellelemente,
  • Fig. 4 ein Steuerschema für eine zu bedruckende Papierbahn.
An embodiment of the invention is shown schematically in the drawings. It shows:
  • 1 is a side view of an offset printing unit with a color metering device according to EP-A-0 093 879,
  • 2 shows a longitudinal section through the ink metering device,
  • 3 shows a control plan for the control elements,
  • Fig. 4 is a control scheme for a paper web to be printed.

Figur 1 zeigt schematisch eine Offsetdruckmaschine, bei der in bekannter Weise die zu bedruckenden Bogen über einen Anleger 1 einem Druckzylinder 2 zugeführt werden, der mit einem Gummizylinder 3 und einem Plattenzylinder4 zusammenwirkt. Das Druckbild wird somit von dem Plattenzylinder 4 über den Gummizylinder 3 auf den zu bedruckenden Bogen auf den Druckzylinder 2 übertragen. Nach dem Druck wird der Bogen von einer Kettenauslage 5 einem Auslegestapel 6 zugeführt. Für ein Bedrucken einer Papierbahn würde diese zwischen den Druckzylinder 2 und Gummizylinder 3 in bekannter Weise hindurchgeführt.FIG. 1 schematically shows an offset printing machine in which the sheets to be printed are fed in a known manner via a feeder 1 to a printing cylinder 2 which interacts with a blanket cylinder 3 and a plate cylinder 4. The print image is thus transferred from the plate cylinder 4 via the rubber cylinder 3 to the sheet to be printed on the printing cylinder 2. After printing, the sheet is fed from a chain delivery 5 to a delivery stack 6. For printing on a paper web, this would be passed between the impression cylinder 2 and the blanket cylinder 3 in a known manner.

Dem Plattenzylinder 4 ist im gezeigten Ausführungsbeispiel eine Farbauftragwalze 7 zugeordnet, die eine elastische Mantelfläche aufweist und deren Durchmesser dem Plattenzylinderdurchmesser entspricht. Die Farbauftragwalze 7 erhält die Farbe von einem Farbzylinder 8, der mit einer Mantelfläche ausstarrem Material, z. B. Metall, ausgeführt ist. Ein Feuchtwerk 9 überträgt das Feuchtmittel über die beiden Auftragwalzen 10 und 11 auf den Farbzylinder 8, wobei zum schnelleren Einfeuchten die, in Drehrichtung des Farbzylinders gesehen, letzte Auftragwalze 11 an dem Plattenzylinder 4 anschwenkbar gelagert ist (gestrichelt gezeichnet).In the exemplary embodiment shown, the plate cylinder 4 is assigned an inking roller 7, which has an elastic jacket surface and whose diameter corresponds to the plate cylinder diameter. The inking roller 7 receives the ink from an ink cylinder 8, the material with a lateral surface, for. B. metal. A dampening unit 9 transfers the dampening solution via the two application rollers 10 and 11 to the ink cylinder 8, the last application roller 11, viewed in the direction of rotation of the ink cylinder, being pivotably mounted on the plate cylinder 4 for faster moistening (shown in dashed lines).

Dem Farbzylinder 8 ist ein Dosierkörper 12 zugeordnet, der sich an einer Traverse 13, die an den Seitengestellen befestigt ist, über ein Kugelgelenk 14 und über ein Stellelement in Form eines Druckmittelzylinders 15 abstützt. Im Spalt zwischen Farbzylinder 8 und Dosierkörper 12 befindet sich der Farbvorrat 16. In Drehrichtung des Farbzylinders 8 gesehen nach dem Dosierkörper 12 sind Sensoren 17 vorgesehen, die die Schichtdicke der Farbe auf dem Farbzylinder 8 messen.The ink cylinder 8 is assigned a metering body 12, which is supported on a crossmember 13, which is fastened to the side frames, via a ball joint 14 and via an adjusting element in the form of a pressure medium cylinder 15. The ink supply 16 is located in the gap between the ink cylinder 8 and the metering body 12. In the direction of rotation of the ink cylinder 8 seen after the dosing body 12 sensors 17 are provided which measure the layer thickness of the ink on the ink cylinder 8.

Auf der der Traverse 13 gegenüberliegenden Seite des Farbzylinders 8 ist eine weitere Traverse 18 vorgesehen, an der sich ein Stützkörper 19 abstützt. Zwischen Stützkörper 19 und Traverse 18 sind ebenfalls Druckmittelzylinder 20 und Kugelgelenke 21 vorgesehen, die den gleichen Druck ausüben wie die gegenüberliegenden Druckmittelzylinder 15, so daß sich die auf den Farbzylinder 8 einwirkenden Druckkräfte aufheben. Hierdurch wird ein Durchbiegen desselben vermieden.On the side of the ink cylinder 8 opposite the cross member 13, a further cross member 18 is provided, on which a support body 19 is supported. Pressure medium cylinders 20 and ball joints 21, which exert the same pressure as the opposite pressure medium cylinders 15, are also provided between the support body 19 and the cross member 18, so that the pressure forces acting on the ink cylinder 8 cancel each other out. This prevents the same from bending.

Im gezeigten Ausführungsbeispiel weist der Farbzylinder 8 in seinem Inneren eine Kammer 22 auf, die mit einer Kühlflüssigkeit gefüllt sein kann. Figur 2 zeigt eine Farbdosiereinrichtung gemäß Figur 1 in Teillängsschnitt, mit einer Lagerung des Farbzylinders 8 über Wälzlager 23 in den Maschinenseitengestellen 24, 25. Der Mantel 26 des Farbzylinders 8 liegt an den Stirnseiten an Dichtbacken 27 für die Farbe an. Diese wiederum sind an den Traversen 13 und 18 befestigt. Die Kammer 22 ist über die Bohrung 28 an einen nicht dargestellten Kühlmittelkreislauf angeschlossen.In the exemplary embodiment shown, the ink cylinder 8 has a chamber 22 in its interior, which can be filled with a cooling liquid. FIG. 2 shows an ink metering device according to FIG. 1 in a partial longitudinal section, with the ink cylinder 8 being supported by roller bearings 23 in the machine side frames 24, 25. The jacket 26 of the ink cylinder 8 lies on the end faces of sealing jaws 27 for the ink. These in turn are attached to the trusses 13 and 18. The chamber 22 is connected via the bore 28 to a coolant circuit, not shown.

Die Druckmittelzylinder 15 sind gemäß Figur 3 über eine Druckmittelleitung 29 mit einem Druckminderventil 30 verbunden, das über eine weitere Leitung 31 mit einem Hydraulikaggregat 32 in Verbindung steht. Das Hydraulikaggregat 32 erzeugt hierbei einen so hohen Druck, wie er für die maximalen Anforderungen an den Dosierkörper 12 benötigt wird. Ober das Druckminderventil 30 wird der Druck soweit reduziert, wie er für den jeweiligen Bedarf erforderlich ist. Diese Reduzierung kann über die Maschinenbreite gleichmäßig oder zonenweise unterschiedlich erfolgen. Zur zeitlichen Veränderung des geminderten Drucks dient z. B. eine Tauchspule 33, deren Erregung über einen Verstärker 34 von einem auf der Scheibe 37 oder einem endlosen Band aufgezeichneten Signal gesteuert wird. Die Scheibe enthält die Information über die jeweilig benötigte Farbmenge für das zu druckende Sujet. Sie läuft synchron zum Plattenzylinder um, jedoch mit einer Voreilung, so daß die Zeit für den Weg der Farbe von der Dosierstelle bis zur Auftragstelle am Plattenzylinder berücksichtigt wird. Die Voreilung ist von den geometrischen Abmessungen des Farbwerks abhängig und für alle vorhandenen Arbeiten gleich und konstant. Die Wege der Kolben oder Membranen in den Druckmittelzylindern 15 betragen nur einige Mymeter, so daß die bewegten Druckmittelvolumina sehr klein sind. Dadurch folgt die Veränderung der Farbschichtstärke praktisch unmittelbar ohne Verzögerung dem vorgegebenen Signal.According to FIG. 3, the pressure medium cylinders 15 are connected via a pressure medium line 29 to a pressure reducing valve 30 which is connected to a hydraulic unit 32 via a further line 31. The hydraulic unit 32 generates a pressure as high as is required for the maximum demands on the metering body 12. Via the pressure reducing valve 30, the pressure is reduced as far as is necessary for the respective need. This reduction can be done uniformly or differently across zones across the machine width. To change the reduced pressure over time serves z. B. a plunger 33, the excitation of which is controlled by an amplifier 34 from a signal recorded on the disc 37 or an endless tape. The disc contains information about the amount of color required for the subject to be printed. It runs synchronously with the plate cylinder, but with a lead, so that the time for the path of the color from the dosing point to the application point on the plate cylinder is taken into account. The advance depends on the geometric dimensions of the inking unit and is the same and constant for all existing work. The paths of the pistons or membranes in the pressure medium cylinders 15 are only a few meters, so that the moving pressure medium volumes are very small. As a result, the change in the color layer thickness follows the specified signal practically without delay.

Das Signal auf der Scheibe 37 kann nach subjektiver Beurteilung der Druckform oder aber auch durch Scanner ermittelt vorgegeben werden. Die Regelung des Druckminderventils 30 kann sowohl analog als auch digital erfolgen. Auch sind an Stelle der Tauchspule 33 andere Steuerelemente für die Druckveränderung möglich. So ist z. B. die Änderung der Federvorspannung des Druckminderventils über eine mit Maschinengeschwindigkeit umlaufende, dem Sujet zugeordnete Steuerscheibe ein Beispiel für eine einfache mechanische Lösung.The signal on the disk 37 can be predetermined after a subjective assessment of the printing form or determined by a scanner. The regulation of the pressure reducing valve 30 can take place both analog and digital. Instead of the plunger 33, other control elements for the pressure change are also possible. So z. B. the change in the spring preload of the pressure reducing valve via a rotating at machine speed, the subject associated control disc an example of a simple mechanical solution.

In Figur 4 ist unten eine Papierbahn 35 wiedergegeben, die in dichter Folge Abdrucke 36 aufweist. Die Papierbahn 35 bewegt sich im Ausführungsbeispiel nach rechts und die Abdrucke sind jeweils auf der rechten Seite mit einer schraffierten Fläche versehen, die einen erhöhten Farbverbrauch andeuten soll. Gemäß dem darüber befindlichen Koordinatensystem sind auf der Abszisse die Abdrucke in Laufrichtung der Bahn wiedergegeben und auf der Ordinate die jeweilig benötigte Farbmenge. In der darunter befindlichen nicht schraffierten Fläche der Abdrucke ist die Farbzufuhr reduziert und jeweils im schraffierten Bereich erhöht. Nachdem die Transportrichtung der Bogen bzw. der Bahn der Drehrichtung des Plattenzylinders 4 entspricht, läßt sich somit in diese Richtung die zugeführte Farbmenge entsprechend dem jeweiligen Verbrauch regeln. Dies kann in gleicher Weise zonenweise erfolgen, sodaß ein Farbrelief auf der Platte erzeugt werden kann, das dem Bedarf weitgehend entspricht. Bedingung für diese Farbdosierung ist, daß ein kurzer Farbweg bis zum Plattenzylinder vorhanden ist und daß die Farbauftragwalze dem Plattenzylinderdurchmesser entspricht, so daß das Farbrelief immer auf der gleichen Stelle der Mantelfläche erzeugt wird.A paper web 35 is shown below in FIG. 4, which has imprints 36 in close succession. In the exemplary embodiment, the paper web 35 moves to the right, and the prints are each provided on the right side with a hatched area, which is intended to indicate increased ink consumption. In accordance with the coordinate system located above, the prints in the running direction of the web are shown on the abscissa and the amount of ink required in each case on the ordinate. In the non-hatched area of the prints below, the ink supply is reduced and increased in each case in the hatched area. After the transport direction of the sheet or web corresponds to the direction of rotation of the plate cylinder 4, the amount of ink supplied can be regulated in this direction in accordance with the respective consumption. This can be done in zones in the same way, so that a color relief can be created on the plate that largely corresponds to the need. The condition for this ink metering is that there is a short ink path to the plate cylinder and that the inking roller corresponds to the plate cylinder diameter, so that the color relief is always generated at the same point on the outer surface.

Claims (5)

1. Device for metering the amount of ink in an offset printing machine having an ink cylinder (8) and an ink applicator roller (7) the diameter of which corresponds to the diameter of the plate cylinder, said ink cylinder (8) having an outer cylindrical surface formed of rigid material, at least one metering body (12) being engageable with said ink cylinder (8) under a given pressure, said metering body having a metering surface extending axially parallel with and tangentially to said outer cylindrical surface of said ink cylinder (8), a stationary bearing (13) supporting said metering body through the intermediary of an adjusting element (15) responsive to a pressure medium,
wherein, for engagement of said metering body (12), the pressure-medium supplying system for said adjusting elements (15) responsive to a pressure medium includes an additional device (33) for varying the pressure of a pressure medium in timed coordination with the respective ink consumption within a printing period.
2. Device according to Claim 1,
wherein said device for varying the pressure of a pressure medium includes a programme control for effecting the time variation of the pressure of a pressure medium with respect to the instantaneous ink consumption with a lead corresponding to the time required by the ink for travelling from the metering location to the printing plate.
3. Device according to Claim 1,
wherein the control for varying the pressure of a pressure medium is provided zonewise for each adjusting element (15).
4. Device according to Claims 1 and 2,
wherein the control is effected by means of pressure-reducing valves (30) which reduce the pressure in the pressure-medium cylinders (15) and
wherein, for a given control sequence, the control signal for varying the pressure is variable in time-span and in control size.
5. Device according to Claims 1 and 2,
wherein the signals for the zonewise arranged pressure-reducing valves (30) are recorded on a disc (37) which is driven in synchronism with the plate cylinder, wherein said signals are transmitted, via an amplifier (34), to moving coils (33) and wherein said individual pressure-reducing valves (30) can be controlled by a respective moving coil (33).
EP84107144A 1983-07-09 1984-06-22 Ink metering device in offset printing machines Expired EP0131186B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3324893 1983-07-09
DE3324893A DE3324893C1 (en) 1983-07-09 1983-07-09 Device for dosing the color in offset printing machines

Publications (3)

Publication Number Publication Date
EP0131186A2 EP0131186A2 (en) 1985-01-16
EP0131186A3 EP0131186A3 (en) 1986-12-30
EP0131186B1 true EP0131186B1 (en) 1989-01-04

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Application Number Title Priority Date Filing Date
EP84107144A Expired EP0131186B1 (en) 1983-07-09 1984-06-22 Ink metering device in offset printing machines

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US (1) US5040459A (en)
EP (1) EP0131186B1 (en)
JP (1) JPS6038158A (en)
DE (1) DE3324893C1 (en)
ES (1) ES533374A0 (en)

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DE19617746B4 (en) * 1996-05-03 2005-05-25 Heidelberger Druckmaschinen Ag Inking unit for a printing press
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Publication number Publication date
JPS6038158A (en) 1985-02-27
EP0131186A2 (en) 1985-01-16
US5040459A (en) 1991-08-20
ES8503205A1 (en) 1985-03-01
DE3324893C1 (en) 1985-03-14
EP0131186A3 (en) 1986-12-30
ES533374A0 (en) 1985-03-01

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