EP0450155B1 - Humidification and inking method for a printing plate positioned on a plate cylinder - Google Patents
Humidification and inking method for a printing plate positioned on a plate cylinder Download PDFInfo
- Publication number
- EP0450155B1 EP0450155B1 EP90122372A EP90122372A EP0450155B1 EP 0450155 B1 EP0450155 B1 EP 0450155B1 EP 90122372 A EP90122372 A EP 90122372A EP 90122372 A EP90122372 A EP 90122372A EP 0450155 B1 EP0450155 B1 EP 0450155B1
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- European Patent Office
- Prior art keywords
- damping
- roller
- printing
- plate cylinder
- inking
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- 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/20—Details
- B41F7/24—Damping devices
- B41F7/26—Damping devices using transfer rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/10—Starting-up the machine
- B41P2233/12—Pre-wetting
Definitions
- the invention relates to a method for moistening and inking a printing plate located on a plate cylinder according to the preamble of claim 1.
- DE 2 845 932 A1 describes a combined dampening inking unit for offset printing units as well as a method for quickly achieving the dampening ink balance when printing operation is resumed.
- a dampening unit part immersion roller and metering roller
- the entire ink dampening unit is pre-moistened.
- the first ink dampening roller is switched off by the intermediate roller (bridge roller) and placed against the plate cylinder, so that the plate is both moistened and supplied with a certain proportion of fresh ink.
- the printing plate is briefly over-moistened, whereupon the remaining inking rollers are placed on the plate cylinder for the purpose of continued printing and the first inking dampening roller and the intermediate roller (bridge roller) are brought into contact.
- a similar principle of pre-wetting and pre-inking his printing plate is given in GB-S-1 377 116.
- the invention is therefore based on the object of expanding a method according to the preamble of claim 1 in such a way that waste can be reduced without the print quality suffering as a result.
- All switching points (instead of the plate cylinder) should lie in the passage of the channel of the plate cylinder, so that no streaking occurs on the printed image on contact, which would otherwise be caused by the speed difference that is inevitable when the plate is turned on.
- the essence of the invention is therefore that the measures described ensure that the dampening roller is pre-moistened well and then transfers the moisture to the plate cylinder without simultaneously pre-moistening the inking rollers. Rather, these are only pre-inked and the pre-inked inking rollers are then brought into contact with the directly pre-moistened plate cylinder, whereupon printing can begin.
- a bridge roller is usually provided, which establishes the connection between the dampening unit and the first of the row of inking rollers.
- the bridge roller is therefore in contact with the dampening roller and, after prewetting and pre-inking the plate cylinder, is also placed against the first inking roller, whereupon printing can begin. However, it can also remain parked on the first inking roller.
- the measures according to claim 3 have the effect that no over-coloring can occur.
- the inking rollers should be separated from the plate cylinder and possibly also from the dampening unit, so that only the dampening unit remains in contact with the plate at low speed. If a bridge roller is present, it also separates from the inking unit, so that too much dampening solution cannot get into the ink.
- control circuit according to the invention and the process sequence according to the invention only add color when a sheet takes off the color.
- the plate is pre-moistened with the correct amount of moisture, which is sufficient for one turn of the plate cylinder. Only then are the pre-inked inking rollers, which have not previously come into contact with the dampness of the dampening unit, placed on the plate cylinder and transfer their color to the plate cylinder or to the printing plate clamped to the plate cylinder.
- a plurality of ink application rollers 1 are provided, against which ink distributor rollers 2 each rest. These rollers are part of an inking unit (not shown) of the printing unit in question.
- a bridge roller 3 is provided, which bears against a dampening roller 4 here.
- a dipping roller 5 dips into a dampening box 8 and a dosing roller 6 bears against the dipping roller 5.
- a plate cylinder 7 is shown, on the circumference of which a printing plate (not shown in the drawing) is clamped.
- the plate cylinder rotates in the direction of arrow 9.
- Fig. 1 the dampening and inking unit is turned off. This is the machine's standstill. If the machine is switched on, all rollers and cylinders are driven to rotate, which is not shown in the drawing. The immersion and metering rollers 5, 6 are already in rotation when the dampening unit is switched on.
- the dampening roller 4 is pre-moistened at an increased speed.
- she is employed on the dipping roller 5. Two turns of the dampening roller are sufficient for this, corresponding to one turn of the plate cylinder 7 by approximately 232 °.
- the dampening roller 4 and the plate cylinder 7 or its printing plate are pre-moistened.
- Fig. 4 the printing plate of the plate cylinder 7 is pre-moistened and pre-inked.
- the inking rollers 1 are placed on the plate cylinder 7. This setting of the inking rollers 1 takes place, based on the plate cylinder 7, 605 ° before the "pressure on" signal.
- the bridge roller 3 is placed against the first inking roller 1.
- the employed bridge roller 3 thus makes the contact from the dampening unit to the inking unit.
- the switching point of the bridge roller is after inking the plate cylinder and before printing begins.
- the advantages of the method according to the invention lie in particular in the fact that the individual components of the printing unit are switched in such a way that the plate cylinder is optimally prepared for printing the first sheet, so that the first sheet already achieves an optimum in printing quality Minimum waste is incurred. All components involved can also be switched individually. The switching sequence was determined empirically. The variability of the system ensures that user-specific process requirements can be met.
- the sheet transport is started.
- the plate cylinder is pre-moistened over 360 ° and then the inking rollers 1 switch to the plate cylinder 7, so that it is pre-inked for 605 ° before the "pressure on" signal.
- the pre-moistening is initiated after the blowing air / suction air of the feeder coupling is applied and after the corresponding revolutions.
- An additional sheet detection for example a sensor, in the path of sheet transport in front of the first printing unit is provided, however, controls the sheet travel, so that in the event of an interruption in printing, only the first printing unit and at most the second printing unit can enter the pre-dampening phase described. All the usual interventions by the operator do not prevent the printing units from being properly prepared in terms of process technology when restarted.
- the bridge roller 3 switches to the inking unit and the connection between water and ink is established. See Fig. 5. With the signal "print-on” only the color lifter (not shown) of the inking unit is then switched on.
- the printing plate is optimally prepared with dampening solution and ink. If the pressure is interrupted, a certain amount of over-humidification or under-humidification is unavoidable and is then dosed precisely.
- the subsequent dampening units are prepared as soon as the first sheet is between the printing units concerned, i.e. in front of the respective printing unit and behind the previous printing unit.
- the third dampening unit is therefore activated shortly before the sheet reaches the second printing unit.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Printing Methods (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Befeuchten und Einfärben einer auf einem Plattenzylinder befindlichen Druckplatte gemäß dem Oberbegriff von Anspruch 1.The invention relates to a method for moistening and inking a printing plate located on a plate cylinder according to the preamble of
Die DE 2 845 932 A1 beschreibt ein kombiniertes Feucht-Farbwerk für Offsetdruckwerke sowie ein Verfahren zum schnellen Erreichen des Farb-Feuchtgleichgewichts bei der Wiederaufnahme des Druckbetriebes. Gemäß diesem vorbekannten Verfahren erfolgt bei abgestellten Auftragwalzen zunächst ein Vorfeuchten eines Feuchtwerkteils (Tauchwalze und Dosierwalze). Daraufhin wird durch Anstellen einer ersten Farb-Feuchtauftragwalze an eine Zwischenwalze (Brückenwalze) eine Vorfeuchtung des gesamten Farb-Feuchtwerkes erzielt. Dann wird die erste Farb-Feuchtauftragwalze von der Zwischenwalze (Brückenwalze) abgestellt und an den Plattenzylinder angestellt, so daß die Platte sowohl gefeuchtet als auch mit einem bestimmten Anteil frischer Farbe versorgt wird. Durch insbesondere erhöhte Drehzahl der Tauchwalze (Feuchtduktor) erfolgt ein kurzzeitiges Überfeuchten der Druckplatte, woraufhin die übrigen Farbauftragwalzen an den Plattenzylinder zwecks Fortdruck angestellt und die erste Farb-Feuchtauftragwalze und die Zwischenwalze (Brückenwalze) in Kontakt gebracht werden. Ein ähnliches Prinzip des Vorfeuchtens und Voreinfärben seiner Druckplatte ist in der GB-S-1 377 116 wiedergegeben.DE 2 845 932 A1 describes a combined dampening inking unit for offset printing units as well as a method for quickly achieving the dampening ink balance when printing operation is resumed. According to this previously known method, when the application rollers are parked, a dampening unit part (immersion roller and metering roller) is first pre-moistened. Then, by placing a first ink dampening roller on an intermediate roller (bridge roller), the entire ink dampening unit is pre-moistened. Then the first ink dampening roller is switched off by the intermediate roller (bridge roller) and placed against the plate cylinder, so that the plate is both moistened and supplied with a certain proportion of fresh ink. Due to the increased speed of the immersion roller (dampening roller) in particular, the printing plate is briefly over-moistened, whereupon the remaining inking rollers are placed on the plate cylinder for the purpose of continued printing and the first inking dampening roller and the intermediate roller (bridge roller) are brought into contact. A similar principle of pre-wetting and pre-inking his printing plate is given in GB-S-1 377 116.
Nachteilig an der oben wiedergegebenen Verfahrensführung ist aber, daß man bei jedem Andruck, auch wenn dieser einwandfrei abläuft, verhältnismäßig viel Makulatur hat. Man rechnet mit etwa 7 Bögen Makulatur pro Andruck.A disadvantage of the procedure described above, however, is that each time the proof is printed, even if it runs smoothly, there is a relatively large amount of waste. Approximately 7 sheets of waste per proof are expected.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff von Anspruch 1 derartig zu erweitern, so daß die Makulatur verringert werden kann, ohne das darunter die Druckqualität leidet.The invention is therefore based on the object of expanding a method according to the preamble of
Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This object is achieved by the characterizing features of
Alle Schaltpunkte (Anstellen an den Plattenzylinder) sollen dabei im Durchlauf des Kanals des Plattenzylinders liegen, damit bei dem Kontakt keine Streifenbildung auf dem Druckbild entsteht, die sonst durch die beim Anstellen zwangsläufig vorhandene Drehzahldifferenz hervorgerufen würde.All switching points (instead of the plate cylinder) should lie in the passage of the channel of the plate cylinder, so that no streaking occurs on the printed image on contact, which would otherwise be caused by the speed difference that is inevitable when the plate is turned on.
Versuche haben ergeben, daß man bei Verwendung dieses Steuerungs- bzw. Verfahrensprinzips mit lediglich ein bis zwei Bogen Makulatur pro Andruck auskommt, und zwar bei unverändert guter Druckqualität, verglichen mit etwa sieben Bogen Makulatur beim eingangs geschilderten Stand der Technik.Experiments have shown that when using this control or process principle with only one or two Sheets of waste per proof, and still with good print quality, compared to about seven sheets of waste in the state of the art described at the beginning.
Kern der Erfindung ist es somit, daß durch die beschriebenen Maßnahmen dafür gesorgt wird, daß die Feuchtauftragswalze gut vorgefeuchtet wird und dann die Feuchtigkeit auf den Plattenzylinder überträgt, ohne daß gleichzeitig die Farbauftragswalzen vorgefeuchtet werden. Diese werden vielmehr nur voreingefärbt und die voreingefärbten Farbauftragswalzen werden anschließend in Kontakt mit dem direkt vorgefeuchteten Plattenzylinder gebracht, worauf der Druck beginnen kann.The essence of the invention is therefore that the measures described ensure that the dampening roller is pre-moistened well and then transfers the moisture to the plate cylinder without simultaneously pre-moistening the inking rollers. Rather, these are only pre-inked and the pre-inked inking rollers are then brought into contact with the directly pre-moistened plate cylinder, whereupon printing can begin.
Bei derartigen Druckwerken ist üblicherweise eine Brückenwalze vorgesehen, die die Verbindung zwischen dem Feuchtwerk und der ersten der Reihe der Farbauftragswalzen herstellt. Die Brückenwalze liegt daher an der Feuchtauftragswalze an und wird nach dem Voreinfeuchten und Voreinfärben des Plattenzylinders auch an die erste Farbauftragswalze angestellt, worauf der Druck beginnen kann. Sie kann aber auch von der ersten Farbauftragswalze abgestellt bleiben.In such printing units, a bridge roller is usually provided, which establishes the connection between the dampening unit and the first of the row of inking rollers. The bridge roller is therefore in contact with the dampening roller and, after prewetting and pre-inking the plate cylinder, is also placed against the first inking roller, whereupon printing can begin. However, it can also remain parked on the first inking roller.
Die Maßnahmen nach Anspruch 3 bewirken, daß keine Überfärbung entstehen kann.The measures according to
Bei einer Mehrfarben-Druckmaschine ist es wesentlich, daß die weiteren Druckwerke so spät wie möglich auf das Drucken vorbereitet werden, damit auch hier genauso viel Feuchtigkeit und Farbe wie notwendig, aber nicht mehr, vor dem eigentlichen Druckvorgang auf den Plattenzylinder übertragen werden.In a multi-color press, it is essential that the other printing units are prepared for printing as late as possible, so that as much moisture and color as necessary, but no longer, is transferred to the plate cylinder before the actual printing process.
Bei einer Druckunterbrechung sollen die Farbauftragswalzen vom Plattenzylinder und ggf. auch vom Feuchtwerk getrennt werden, so daß nur das Feuchtwerk bei niedriger Drehzahl in Kontakt mit der Platte bleibt. Ist eine Brückenwalze vorhanden, so trennt sich diese ebenfalls vom Farbwerk, so daß nicht zu viel Feuchtmittel in die Farbe gelangen kann.If printing is interrupted, the inking rollers should be separated from the plate cylinder and possibly also from the dampening unit, so that only the dampening unit remains in contact with the plate at low speed. If a bridge roller is present, it also separates from the inking unit, so that too much dampening solution cannot get into the ink.
Bei Druckunterbrechungen unterscheidet man allgemein nach gewollten und ungewollten Unterbrechungen. Bei einer gewollten Druckunterbrechung wird das Feuchtwerk auch mit den "Druck-ab-Signal" verzögert abgestellt. Bei einer ungewollten Druckunterbrechung bleiben die Feuchtwerke der Maschine noch für etwa 40 Umdrehungen des Plattenzylinders an die Platte angestellt.In the case of printing interruptions, a distinction is generally made between deliberate and unwanted interruptions. In the event of a deliberate pressure interruption, the dampening unit is also switched off with the "pressure-off signal". If the pressure is interrupted unintentionally, the dampening systems of the machine remain on the plate for about 40 revolutions of the plate cylinder.
Für das Anfahren werden unterschiedliche Überfeuchtdrehzahlen eingesetzt und diese richten sich danach, aus welcher Situation wieder angefahren wird.Different over-humidification speeds are used for the start-up and these depend on the situation from which the start-up is started again.
Versuche haben ergeben, daß, jeweils bezogen auf den Plattenzylinder, optimale Ergebnisse erzielt werden, wenn die Feuchtauftragswalze über 262° vorgefeuchtet wird und der Plattenzylinder über 360° vorgefeuchtet wird und über 605° vorgefärbt wird. Diese Gradzahlen können natürlich noch nach oben oder unten schwanken und sind von der Geometrie der Maschine abhängig, wobei Schwankungen um etwa ± 10 % ebenfalls noch gute Ergebnisse liefern, sofern das vorstehend erläuterte Prinzip dieser Erfindung beibehalten bleibt. Die angegebenen Gradzahlen sind berechnet nach einem Plattenzylinder, dessen Drucklänge einen Umfang von ca. 270° - 300° hat.Experiments have shown that, based in each case on the plate cylinder, optimum results are achieved if the dampening roller is pre-moistened over 262 ° and the plate cylinder is pre-moistened over 360 ° and pre-inked over 605 °. These degrees can of course still fluctuate up or down and depend on the geometry of the machine, with fluctuations of around ± 10% as well still give good results if the principle of this invention explained above is maintained. The specified degrees are calculated according to a plate cylinder, the printing length of which is approximately 270 ° - 300 °.
Wesentlich ist es somit, daß durch die erfindungsgemäße Steuerschaltung bzw. den erfindungsgemäßen Verfahrensablauf erst dann Farbe nachgefördert wird, wenn ein Bogen die Farbe abnimmt. Die Platte wird genau mit der richtigen Feuchtigkeitsmenge vorgefeuchtet, wozu etwa eine Umdrehung des Plattenzylinders genügt. Erst dann werden die voreingefärbten Farbauftragswalzen, die bisher nicht in Berührung mit der Feuchtigkeit des Feuchtwerks gelangt sind, an den Plattenzylinder angestellt und übertragen ihre Farbe auf den Plattenzylinder bzw. auf die am Plattenzylinder festgespannte Druckplatte.It is therefore essential that the control circuit according to the invention and the process sequence according to the invention only add color when a sheet takes off the color. The plate is pre-moistened with the correct amount of moisture, which is sufficient for one turn of the plate cylinder. Only then are the pre-inked inking rollers, which have not previously come into contact with the dampness of the dampening unit, placed on the plate cylinder and transfer their color to the plate cylinder or to the printing plate clamped to the plate cylinder.
Die Erfindung wird im folgenden anhand von Ausführungsbeispielen näher erläutert, aus dem sich weitere wichtige Merkmale ergeben. Die Figuren zeigen schematisch die für die erfindungsgemäße Steuerung wesentlichen Bauelemente eines Druckwerks einer Mehrfarben-Offset-Bogendruckmaschine in ihren jeweiligen Betriebsstellungen, und zwar zeigt
- Fig. 1 -
- den Plattenzylinder mit den verschiedenen Walzen vor Beginn der eigentlichen Vorbereitungsphase, d.h. das Feucht- und Farbwerk sind abgestellt;
- Fig. 2 -
- die Situation nach Fig. 1, wobei die Feuchtauftragswalze und die Brückenwalze mit erhöhter Drehzahl vorgefeuchtet werden;
- Fig. 3 -
- die Feuchtauftragswalze, die Brückenwalze und die Druckplatte des Plattenzylinders werden vorgefeuchtet;
- Fig. 4 -
- die Druckplatte wird vorgefeuchtet und voreingefärbt;
- Fig. 5 -
- die Brückenwalze stellt den Kontakt vom Feuchtwerk zum Farbwerk her;
Zunächst sei anhand von Fig. 1 der grundsätzliche Aufbau der hier interessierenden Bauelemente eines Feucht- und Farbwerks nach der Erfindung erläutert, wie dies auch Stand der Technik ist.The invention is explained in more detail below on the basis of exemplary embodiments, from which further important features result. The figures schematically show the components of a printing unit of a multi-color offset sheet-fed printing press that are essential for the control according to the invention, in their respective operating positions, namely
- Fig. 1 -
- the plate cylinder with the various rollers before the actual preparation phase begins, ie the dampening and inking units are switched off;
- Fig. 2 -
- the situation of Figure 1, wherein the dampening roller and the bridge roller are pre-moistened at increased speed.
- Fig. 3 -
- the dampening roller, the bridge roller and the pressure plate of the plate cylinder are pre-moistened;
- Fig. 4 -
- the printing plate is pre-moistened and pre-inked;
- Fig. 5 -
- the bridge roller makes contact from the dampening unit to the inking unit;
1, the basic structure of the components of a dampening and inking unit according to the invention that are of interest here is explained, as is also the state of the art.
Es sind mehrere Farbauftragswalzen 1 vorgesehen, an denen jeweils Farbverreiberwalzen 2 anliegen. Diese Walzen sind Teil eines im übrigen nicht gezeigten Farbwerks des betreffenden Druckwerks.A plurality of
Außerdem ist eine Brückenwalze 3 vorgesehen, die hier an einer Feuchtauftragswalze 4 anliegt.In addition, a
Eine Tauchwalze 5 taucht in einen Feuchtkasten 8 ein und an der Tauchwalze 5 liegt eine Dosierwalze 6 an.A dipping
Außerdem ist ein Plattenzylinder 7 gezeigt, auf dessen Umfang eine - zeichnerisch nicht dargestellte - Druckplatte festgespannt ist. Der Plattenzylinder dreht in Richtung des Pfeiles 9.In addition, a
In Fig. 1 ist das Feucht- und Farbwerk abgestellt. Dies ist der Stillstand der Maschine. Wird die Maschine eingeschaltet, so werden alle Walzen und Zylinder auf Drehung angetrieben, was zeichnerisch nicht dargestellt ist. Die Tauch- und Dosierwalze 5, 6 sind mit dem Einschalten des Feuchtwerks schon vorher auf Drehung.In Fig. 1, the dampening and inking unit is turned off. This is the machine's standstill. If the machine is switched on, all rollers and cylinders are driven to rotate, which is not shown in the drawing. The immersion and
In den folgenden Figuren sind diejenigen Walzen, die bei dem betreffenden Schritt aktiviert wurden, schwarz gerändert und schraffiert zeichnerisch hervorgehoben.In the following figures, those rollers that were activated during the step in question are highlighted in black and hatched in the drawing.
In Fig. 2 wird die Feuchtauftragswalze 4 mit erhöhter Drehzahl vorgefeuchtet. Zu diesem Zweck ist sie an die Tauchwalze 5 angestellt. Hierfür reichen zwei Umdrehungen der Feuchtauftragswalze aus, entsprechend einer Umdrehung des Plattenzylinders 7 um etwa 232°.2, the dampening
In Fig. 3 werden die Feuchtauftragswalze 4 und der Plattenzylinder 7 bzw. dessen Druckplatte vorgefeuchtet. Hierzu wurde die Feuchtauftragswalze 4 an den Plattenzylinder 7 angestellt. Dieses Vorfeuchten erfolgt über eine Umdrehung (= 360°) des Plattenzylinders 7.In Fig. 3, the dampening
In Fig. 4 wird die Druckplatte des Plattenzylinders 7 vorgefeuchtet und voreingefärbt. Hierzu sind die Farbauftragswalzen 1 an den Plattenzylinder 7 angestellt. Dieses Anstellen der Farbauftragswalzen 1 erfolgt, bezogen auf den Plattenzylinder 7, 605° vor dem Signal "Druck an".In Fig. 4 the printing plate of the
In Fig. 5 ist die Brückenwalze 3 an die erste Farbauftragswalze 1 angestellt. Hier stellt die angestellte Brückenwalze 3 also den Kontakt vom Feuchtwerk zum Farbwerk her. Der Schaltpunkt der Brückenwalze liegt nach dem Einfärben des Plattenzylinders und vor dem Druckbeginn.5, the
Es ist somit ersichtlich, daß die Vorteile der erfindungsgemäßen Verfahrensführung insbesondere darin liegen, daß die einzelnen Komponenten des Druckwerks so geschaltet werden, daß der Plattenzylinder für den Druck des ersten Bogens optimal vorbereitet ist, damit schon der erste Bogen ein Optimum an Druckqualität erreicht und ein Minimum an Makulatur anfällt. Alle beteiligten Komponenten lassen sich auch einzeln schalten. Die Schaltsequenz wurde empirisch ermittelt. Durch die Variabilität des Systems ist gewährleistet, daß anwenderspezifische Verfahrensanforderungen erfüllt werden können.It can thus be seen that the advantages of the method according to the invention lie in particular in the fact that the individual components of the printing unit are switched in such a way that the plate cylinder is optimally prepared for printing the first sheet, so that the first sheet already achieves an optimum in printing quality Minimum waste is incurred. All components involved can also be switched individually. The switching sequence was determined empirically. The variability of the system ensures that user-specific process requirements can be met.
Der Verfahrensablauf stellt sich bei einer Mehrfarben-Druckmaschine somit wie folgt dar.The process sequence for a multicolour printing machine is therefore as follows.
Der Bogentransport wird eingeleitet. Die erste Feuchtwalze wird mit einem bestimmten Vorlauf (= 232°) zur Tauchwalze 5 und dann zum Plattenzylinder 7 geschaltet. Der Plattenzylinder wird über 360° vorgefeuchtet und dann schalten die Farbauftragswalzen 1 zum Plattenzylinder 7, so daß diese 605° lang vor dem Signal "Druck an" voreingefärbt wird.The sheet transport is started. The first dampening roller is switched to the
Das Vorfeuchten wird nach dem Anliegen der Blasluft/Saugluft der Anlegerkupplung und nach den entsprechenden Umdrehungen eingeleitet. Eine zusätzliche Bogenerkennung, z.B. ein Sensor, die im Weg des Bogentransports vor dem ersten Druckwerk vorgesehen ist, kontrolliert jedoch den Bogenlauf, so daß bei einer eventuellen Druckunterbrechung nur das erste Druckwerk und maximal auch das zweite Druckwerk in die beschriebene Vorfeuchtphase eintreten können. Alle üblichen Eingriffe des Bedieners verhindern nicht, daß beim erneuten Start die Druckwerke verfahrenstechnisch richtig vorbereitet werden.The pre-moistening is initiated after the blowing air / suction air of the feeder coupling is applied and after the corresponding revolutions. An additional sheet detection, for example a sensor, in the path of sheet transport in front of the first printing unit is provided, however, controls the sheet travel, so that in the event of an interruption in printing, only the first printing unit and at most the second printing unit can enter the pre-dampening phase described. All the usual interventions by the operator do not prevent the printing units from being properly prepared in terms of process technology when restarted.
Da dieser Vorlauf etwas größer ist als der Abstand von Druckwerk zu Druckwerk, wird das zweite Druckwerk der Maschine auch schon in Vorbereitung gebracht, obwohl der erste Bogen sich noch nicht im Druck befindet.Since this lead is slightly larger than the distance from printing unit to printing unit, the second printing unit of the press is already being prepared, even though the first sheet is not yet in print.
245° vor dem Signal "Druck-an" schaltet sich die Brückenwalze 3 zum Farbwerk und damit ist die Verbindung Wasser - Farbe hergestellt. Siehe Fig. 5. Mit dem Signal "Druck-an" wird dann nur noch der - nicht gezeigte - Farbheber des Farbwerks zugeschaltet.245 ° before the "Print on" signal, the
Die Druckplatte wird mit Feuchtmittel und Farbe optimal vorbereitet. Bei einer Druckunterbrechung ist ein gewisses Überfeuchten oder Unterfeuchten nicht vermeidbar und wird dann aber genau dosiert.The printing plate is optimally prepared with dampening solution and ink. If the pressure is interrupted, a certain amount of over-humidification or under-humidification is unavoidable and is then dosed precisely.
Die nachfolgenden Feuchtwerke werden, wie vorstehend beschrieben, in Vorbereitung gebracht, sobald sich der erste Bogen zwischen den betreffenden Druckwerken befindet, d.h. vor dem jeweiligen Druckwerk und hinter dem vorhergehenden Druckwerk. Das dritte Feuchtwerk wird also geschaltet kurz bevor der Bogen das zweite Druckwerk erreicht.As described above, the subsequent dampening units are prepared as soon as the first sheet is between the printing units concerned, i.e. in front of the respective printing unit and behind the previous printing unit. The third dampening unit is therefore activated shortly before the sheet reaches the second printing unit.
Bei einer Druckunterbrechung bleibt nur das Feuchtwerk bei niedriger Drehzahl in Kontakt mit dem Plattenzylinder. Die Brückenwalze trennt sich ebenfalls vom Farbwerk, so daß nicht zu viel Feuchtmittel in die Farbe gelangen kann.If the pressure is interrupted, only the dampening unit remains in contact with the plate cylinder at low speed. The Bridge roller also separates from the inking unit, so that too much dampening solution cannot get into the ink.
Bei Druckunterbrechungen unterscheidet man allgemein nach gewollten und ungewollten Unterbrechungen. Bei einer gewollten Unterbrechung wird das Feuchtwerk ebenfalls mit dem Signal "Druck-Ab" verzögert abgestellt. Bei einer ungewollten Unterbrechung bleiben alle Feuchtwerke noch für etwa 40 Umdrehungen mit verringerter Drehzahl am Plattenzylinder angestellt.In the case of printing interruptions, a distinction is generally made between deliberate and unwanted interruptions. In the event of a deliberate interruption, the dampening unit is also switched off with a delay with the "Pressure down" signal. In the event of an unintentional interruption, all dampening systems remain on the plate cylinder for about 40 revolutions at a reduced speed.
Für das Anfahren werden unterschiedliche Überfeuchtdrehzahlen eingesetzt und diese richten sich danach, aus welcher Situation wieder angefahren wird.Different over-humidification speeds are used for the start-up and these depend on the situation from which the start-up is started again.
Claims (3)
- Process for damping and inking a printing plate located on a plate cylinder in the printing unit of an offset sheet printing press, wherein arranged relative to the plate cylinder is a damping and inking unit which has ink applicator rollers as well as a damping agent applicator roller which can be set off and against the plate cylinder as well as a switchable bridge roller, and in which, for avoiding waste on taking up print work with the ink and damping applicator roller set off, a pre-damping of the damping agent applicator roller takes place, whereafter by setting on the damping agent applicator roller, a damping of the printing plate and by subsequent setting on of the ink applicator rollers an inking up of the printing plate and then a switchover of the bridge roller takes place, characterised in that both on pre-damping of the damping unit (3, 4, 5, 6, 8) and also during the successive pre-damping and pre-inking of the plate cylinder (7) by application of the ink applicator roller (4) as well as the ink applicator rollers (11) the bridge roller (3) is set against the damping agent applicator roller (4) and is set off from the first ink applicator roller (1) and that after setting on the damping agent applicator roller (4) as well as the ink applicator roller (1) against the plate cylinder (7), the bridge roller located in contact with the damping agent applicator roller (4) is still set against the first ink applicator roller (1) prior to the printing of the first sheet.
- Process according to Claim 1, characterised in that in an offset sheet printing press with plate cylinders (7) arranged in print units separated from one another in a third and the further print units the pre-damping of the damping unit (3, 4, 5, 6, 8) as well as the damping and inking up of the printing plate are triggered at a point in time when the first sheet to be printed is located in the respective preceding print unit.
- Process according to Claim 1 or 2, characterised in that in the inking unit the ink flow from the ductor to the ink applicator rollers (1) is interrupted for such a period of time until the first sheet picks up ink from the plate cylinder (7).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4011039 | 1990-04-05 | ||
| DE4011039A DE4011039C2 (en) | 1990-04-05 | 1990-04-05 | Process for moistening and inking a plate cylinder of a multi-color offset sheet-fed rotary printing press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0450155A1 EP0450155A1 (en) | 1991-10-09 |
| EP0450155B1 true EP0450155B1 (en) | 1994-06-15 |
Family
ID=6403839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90122372A Expired - Lifetime EP0450155B1 (en) | 1990-04-05 | 1990-11-23 | Humidification and inking method for a printing plate positioned on a plate cylinder |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0450155B1 (en) |
| JP (1) | JP2997084B2 (en) |
| AT (1) | ATE107227T1 (en) |
| DE (2) | DE4011039C2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5447102A (en) * | 1993-04-14 | 1995-09-05 | Heidelberger Druckmaschinen Aktiengesellschaft | Process for operating a printing press |
| EP0697283A2 (en) | 1994-08-18 | 1996-02-21 | MAN Roland Druckmaschinen AG | Method for starting a dampening unit of an offset printing press |
| DE19506639A1 (en) * | 1995-02-25 | 1996-09-05 | Roland Man Druckmasch | Control scheme for combined colour-damping device on offset printer |
| DE19645169A1 (en) * | 1996-11-02 | 1998-05-14 | Roland Man Druckmasch | Process for cleaning cylinders and rollers in a printing press |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19501146C1 (en) * | 1995-01-17 | 1996-04-25 | Roland Man Druckmasch | Wetting mechanism for offset rotary printing machines |
| DE19510082C2 (en) * | 1995-03-20 | 1997-07-17 | Roland Man Druckmasch | Method and device for controlling the sheet feed in a sheet-fed offset printing machine |
| DE19529205C2 (en) * | 1995-08-09 | 1997-08-14 | Roland Man Druckmasch | Dampening unit for an offset printing machine |
| DE19529204C2 (en) * | 1995-08-09 | 1997-08-14 | Roland Man Druckmasch | Dampening unit for an offset printing machine |
| DE29706932U1 (en) * | 1997-04-17 | 1997-06-05 | MAN Roland Druckmaschinen AG, 63075 Offenbach | Dampening unit for an offset printing machine |
| DE60141261D1 (en) | 2000-05-17 | 2010-03-25 | Komori Printing Mach | Method of removing printing ink for a printing press |
| DE10225244B4 (en) * | 2002-06-07 | 2016-02-04 | Koenig & Bauer Ag | Method for starting the printing after a print interruption |
| DE20303902U1 (en) | 2003-03-12 | 2003-05-08 | Roland Man Druckmasch | Combined inking and dampening system for a printing press |
| DE102004047168A1 (en) | 2004-09-29 | 2006-04-06 | Man Roland Druckmaschinen Ag | Printer unit for newspaper printing machine, has ink distribution roller suppressible faster than damping device and application roller adjustable at cylinder for switching of indirect damping agent guide to direct damping agent guide |
| DE102007034880A1 (en) * | 2007-07-24 | 2009-01-29 | Heidelberger Druckmaschinen Ag | Development of printing plates in offset printing machines |
| DE102008007680A1 (en) * | 2008-02-07 | 2009-11-05 | Manroland Ag | Printing unit for a processing machine |
| DE102008001302A1 (en) * | 2008-04-22 | 2009-10-29 | Manroland Ag | Printing machine, particularly sheet printing machine, has multiple printing units, where damping system is divided in respective printing unit of inking system such that damping system is driven and inking system is disengaged |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1044042A (en) * | 1963-07-01 | 1966-09-28 | Dahlgren Harold P | Method and means for dampening lithographic offset printing plates |
| GB1207220A (en) * | 1968-07-03 | 1970-09-30 | Pfizer & Co C | Paper coating and coated paper |
| GB1377116A (en) * | 1972-11-30 | 1974-12-11 | Polygraph Leipzig | Dampening devices for off-set printing machines |
| DE2343935A1 (en) * | 1973-08-31 | 1975-03-13 | Maschf Augsburg Nuernberg Ag | Rotary offset printer dampening unit - one roller does not contact plate cylinder while distributor surface picks up ink |
| DE2845932A1 (en) * | 1978-10-21 | 1980-04-24 | Heidelberger Druckmasch Ag | COMBINED MOISTURE INK FOR OFFSET PRINTING |
| GB2077660A (en) * | 1980-06-13 | 1981-12-23 | Vickers Ltd | Lithographic printing presses |
| DE3146223C2 (en) * | 1981-11-21 | 1985-03-21 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Moist inking unit for offset printing machines |
| IT1214887B (en) * | 1985-12-04 | 1990-01-18 | Ghisalberti Luigi | REVERSIBLE PRINTER UNIT FOR OFF-SET CONGLOBANT MACHINES DEVICES FOR WATERING AND PAINTING. |
| DE3623590A1 (en) * | 1986-07-12 | 1988-02-04 | Miller Johannisberg Druckmasch | FILM DAMPING UNIT FOR OFFSET PRINTING MACHINES |
| JPH0741707B2 (en) * | 1988-05-06 | 1995-05-10 | リョービ株式会社 | Offset printing machine with operating lever |
| JPH0299637U (en) * | 1989-01-27 | 1990-08-08 |
-
1990
- 1990-04-05 DE DE4011039A patent/DE4011039C2/en not_active Expired - Fee Related
- 1990-11-23 AT AT90122372T patent/ATE107227T1/en not_active IP Right Cessation
- 1990-11-23 DE DE59006152T patent/DE59006152D1/en not_active Expired - Fee Related
- 1990-11-23 EP EP90122372A patent/EP0450155B1/en not_active Expired - Lifetime
-
1991
- 1991-04-03 JP JP3096178A patent/JP2997084B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5447102A (en) * | 1993-04-14 | 1995-09-05 | Heidelberger Druckmaschinen Aktiengesellschaft | Process for operating a printing press |
| EP0697283A2 (en) | 1994-08-18 | 1996-02-21 | MAN Roland Druckmaschinen AG | Method for starting a dampening unit of an offset printing press |
| DE4428887A1 (en) * | 1994-08-18 | 1996-02-22 | Roland Man Druckmasch | Method for starting a dampening unit of an offset printing press |
| DE19506639A1 (en) * | 1995-02-25 | 1996-09-05 | Roland Man Druckmasch | Control scheme for combined colour-damping device on offset printer |
| DE19645169A1 (en) * | 1996-11-02 | 1998-05-14 | Roland Man Druckmasch | Process for cleaning cylinders and rollers in a printing press |
| DE19645169C2 (en) * | 1996-11-02 | 2000-02-03 | Roland Man Druckmasch | Process for cleaning cylinders and rollers in a printing press |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4011039A1 (en) | 1991-10-10 |
| EP0450155A1 (en) | 1991-10-09 |
| ATE107227T1 (en) | 1994-07-15 |
| DE59006152D1 (en) | 1994-07-21 |
| DE4011039C2 (en) | 1996-03-14 |
| JPH04226352A (en) | 1992-08-17 |
| JP2997084B2 (en) | 2000-01-11 |
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