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EP0652104A1 - Printing unit for waterless offset printing - Google Patents

Printing unit for waterless offset printing Download PDF

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Publication number
EP0652104A1
EP0652104A1 EP94117057A EP94117057A EP0652104A1 EP 0652104 A1 EP0652104 A1 EP 0652104A1 EP 94117057 A EP94117057 A EP 94117057A EP 94117057 A EP94117057 A EP 94117057A EP 0652104 A1 EP0652104 A1 EP 0652104A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
printing
printing unit
transfer
waterless offset
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.)
Granted
Application number
EP94117057A
Other languages
German (de)
French (fr)
Other versions
EP0652104B1 (en
Inventor
Gunnar Rau
Karl Heinz Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE9316932U external-priority patent/DE9316932U1/en
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0652104A1 publication Critical patent/EP0652104A1/en
Application granted granted Critical
Publication of EP0652104B1 publication Critical patent/EP0652104B1/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
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/37—Damping devices with supercooling for condensation of air moisture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/22—Means for cooling or heating forme or impression cylinders

Definitions

  • the invention relates to a printing unit for waterless offset printing according to the preamble of patent claim 1.
  • DE 42 02 544 A1 shows a blown air cooling device with which the printing form is cooled for the purpose of printing in the waterless offset method.
  • a blow bar is placed along the forme cylinder, which sucks in air through a water-cooled heat exchanger by means of fans and blows against the forme cylinder.
  • the disadvantage is that the transfer cylinder heats up very much in such printing units. This heat is generated during the large flexing work of the rubber blanket and can only flow off insignificantly due to the poor heat transfer to neighboring cylinders. Ink builds up on the warm transfer cylinder, which means that the pressure points lead to too much ink. The printer is forced to wash the printing blankets frequently, causing machine downtimes. Otherwise the pressure would smear.
  • the accumulation of ink on the rubber blanket increases the pressure when the transfer cylinder is rolled with the form cylinder and with the impression cylinder and thus leads to the destruction of the rubber blanket.
  • the channels for tensioning the blanket or a finite printing form also cause machine vibrations and reduce the surface area of a forme cylinder or transfer cylinder that can be used for printing. Furthermore, changing a finite printing form is time-consuming.
  • An overriding task is to improve the dynamics of the printing unit.
  • the blowing device cools the printing form and the transfer form. As a result, the latter does not tend to build up printing ink. Thus, while maintaining normal blanket washing cycles, good print quality is achieved and the blanket is protected.
  • the printing unit shown in FIG. 1 contains the printing units 1 and 2.
  • Each printing unit 1, 2 has a transfer cylinder 3, 4 and a forme cylinder 5, 6.
  • An inking unit is arranged on each forme cylinder 5, 6 and contains an ink fountain roller 7, 8 and three ink rubbing cylinders 9 to 14 in addition to the ink fountain and various ink rollers.
  • a blowing device 15, 16 is assigned to each of a transfer and forme cylinder 3, 5 and 4, 6, that is, its blowing opening 17 is directed towards the transfer and forme cylinder 3, 5 and 4, 6, respectively.
  • Each blowing device 15, 16 contains a heat exchanger 18 which is connected to an inlet 19 and an outlet 20 for a coolant. The latter is supplied by a cooling station, not shown.
  • the two transfer cylinders 3, 4 are positioned against each other and print on the web 21 passed between them.
  • the print image of the printing forms stretched on the forme cylinders 5, 6 is inked, transferred to the transfer cylinders 3, 4 and from these to the web 21 on both sides applied.
  • Each blowing device 15, 16 draws in air by means of a fan via the intake duct 22 and the heat exchanger 18 through which the coolant flows. This cools down and is then blown against the transfer cylinder 3 or 4 and the forme cylinder 5 or 6. These cylinders cool down.
  • the control valves 24 to 26 and 41 are actuated by means of thermal sensors, for example infrared sensors, with the interposition of controllers.
  • a thermal sensor 28 to 31 is arranged on the ink fountain roller 7, the inking cylinder 10, the transfer cylinder 3 and the forme cylinder 5.
  • the thermal sensor 28 is provided for the control valve 24, the thermal sensor 29 for the control valve 25, the thermal sensor 30 for the control valve 26 and the thermal sensor 31 for the control valve 41.
  • the regulators are contained in the regulating device 42 (FIG. 2). Furthermore, the thermal sensor 31 is guided together with the thermal sensor 29 to a common controller.
  • the associated control valve 24 to 26 and 41 is opened or closed further and thus the amount of coolant to be supplied to the corresponding cylinder is increased or decreased.
  • the coolant is supplied from a cooling station at a low temperature, for example 12 degrees C.
  • the inking unit is cooled to a temperature of approximately 25 to 27 degrees C, the printing plate to approximately 28 to 30 degrees C and the transfer cylinder to approximately 34 to 35 degrees C.
  • the temperature of the ink fountain roller is advantageously kept higher than the inking unit temperature, for example to 28 to 30 degrees C, because otherwise the ink pulls strings and the ink delivery is thereby disturbed. This procedure is made possible thanks to separate control loops.
  • the inking unit partially cools the forme cylinder Thanks to the application of the application rollers with thick layers of ink and the ink transfer itself, this is already possible. It is therefore also possible to regulate the forme cylinder temperature by eliminating the thermal sensor 29 only with the thermal sensor 31.
  • FIG. 3 wherein a transfer cylinder can have a similar structure.
  • the forme cylinder 43 is mounted with its pins 44, 45 in side walls 46, 47.
  • the pins 44, 45 have flanges 48, 49 with which they are received in a cylinder jacket tube 50.
  • a separating tube 51 and an inflow tube 52 are fastened in the flanges 48, 49.
  • the separating tube 51 forms a cooling chamber 53 together with the cylinder jacket tube 50 and a pressure chamber 54 with the inflow tube 52.
  • the cooling chamber 53 is connected to the inflow tube 52 via connecting bores 55 in the flange 48 and to a discharge channel 57 via connecting bores 56 in the flange 49.
  • the inflow pipe 52 and the discharge duct 57 lead through the drive-side pin 45 to a connection head 58 arranged thereon.
  • a spur gear 59 for driving the cylinder is also mounted on the pin 45.
  • the forme cylinder 43 has a connection bore 60 for compressed air on the drive-side edge of its jacket 78. This is connected to the pressure chamber 54 via a channel 61. From the latter, a channel 62 leads to an annular groove 63, from which radial bores 64 lead out of the cylinder jacket 78 on the operator-side edge. A supply line 65 and a discharge line 66 for the coolant are connected to the connection head 58. The coolant flows through the inflow pipe 52 via the connection bores 55 to the cooling chamber 53, from which it is conducted out of the forme cylinder 43 again via the connection bores 56, the discharge channel 57 and the connection head 58.
  • the circulation in the cooling chamber 53 can advantageously be determined by means of spiral baffles (not shown).
  • 64 compressed air can flow out of the radial bores. This is introduced into the forme cylinder 43 by means of a connection shoe 68 placed on the connection bore 60. The introduction of compressed air can also be provided on the end face of the cylinder body.
  • the operator-side side wall 46 of the printing press has bearing pieces that can be moved apart, the movement of which is indicated by double arrows.
  • the lubricant to be pumped around the gearbox 32 of the drive side wall 33 is passed via a heat exchanger 34.
  • the coolant of a coolant circuit flows through the latter.
  • a control valve 36 which is controlled by a controller 37.
  • the outputs of two thermal sensors 38, 39 are guided on the input side of the controller 37, one of which is arranged on the drive side wall 33 and one on the operating side wall 40.
  • Resistance thermometers are advantageously used as thermal sensors, whereby platinum (Pt 100) is particularly suitable because its resistance changes proportionally with the temperature.
  • the control loop serves to keep the drive side wall 33 and the operating side wall 40 at the same temperature.
  • the drive side wall 33 has a higher temperature than the operating side wall 40 due to the frictional losses of the gearboxes 32 that are converted into heat.
  • the result is a non-constant temperature profile over the length of the cylinders mounted in the side walls 33, 40. Accordingly, the temperature conditions of the mounted cylinders cannot be optimally determined over their length.
  • the controller 37 is set so that the control valve 36 opens when the temperature of the drive side wall 33 is higher than the control side wall 40 and thus cools the lubricant of the gearbox 32 with a corresponding throughput of coolant through the heat exchanger 34. This in turn cools the drive side wall 33 to the temperature of the operating side wall 40 during its circulation. With the temperature equality of both side walls, the temperature constancy of the printing unit cylinders is given over their length and a prerequisite for good print quality across the entire printing width is created.
  • the individual cooling circuits are supplied with coolant by one or more cooling stations.
  • the printing units can also be equipped separately with control loops at great expense. Conversely, good results can already be achieved with cost savings if additional printing units are connected to the control devices of the printing unit 1.
  • the coolant supply and the blower output can also be regulated in the blowing devices. Water is advantageously used as the coolant.
  • the coolant circuits can be used in the preparation phase for the printing operation for preheating the printing units by first supplying a correspondingly heated coolant. This will cause the ink to pick when printing starts with the accumulation of paper particles in the This is very important because waterless offset printing lacks the dampening system that could otherwise remove particles from the printing unit.
  • the cooling station is then regulated in such a way that the coolant temperature gradually drops in the production run.
  • the printer uses the cooling circuits described and those shown in FIGS. 1 and 2 and sets a higher temperature value of the coolant temperature on the thermostat of the cooling station (not shown), advantageously the operating temperature of the ink rubbing cylinders.
  • the printer then gradually lowers the coolant temperature in accordance with the higher cooling requirement due to the self-heating of the printing unit, the temperature of which can be read off from a thermometer.
  • the temperature profile of the coolant for preheating can also be regulated according to a temperature-time curve entered in a storage unit or using a temperature sensor, for example on a color friction cylinder, in connection with a controller. It can e.g. B. the thermal sensor 29 on the ink cylinder 10 can be used.
  • the storage unit can be accommodated in the control device 42.
  • a web can also be printed using the so-called di-litho process.
  • a relevant course of the path is shown in dashed lines in FIG. 1.
  • the web 70 is passed between the transfer cylinder 4 and the form cylinder 6 and thereby printed by the latter.
  • a second color is printed on the printed web side, so that a 2 + O print is produced.
  • the printing unit can also cooperate with an actual impression cylinder instead of with the transfer cylinder of another printing unit.
  • a three-cylinder printing unit is shown in FIG. 5. It contains a forme cylinder 71, a transfer cylinder 72 and an impression cylinder 73.
  • the forme cylinder 71 is inked by a short inking unit, namely an anilox inking unit.
  • This contains an anilox roller 75 inked by a chambered doctor blade 74 and an applicator roller 76.
  • the anilox roller 75 dyes the applicator roller 76, which in turn inked the printing form of the forme cylinder 71.
  • the latter transfers the print image to the transfer cylinder 72, which prints on the web 77.
  • the cooling devices have not been shown for the sake of simplicity.
  • Ionizing bars for eliminating electrostatic charges are also advantageously used in printing units for waterless offset printing.
  • ionizing rods 79, 80 are arranged on both sides of the web 21 after their passage between the transfer cylinders 3, 4 which print on them.
  • Ionizing bars can also be arranged in front of or in front of and after the cylinders printing on the web 21.
  • the web which is drier in waterless offset printing, tends to electrostatically charge with a correspondingly strong attraction of dust particles from the environment. These settle on the transfer cylinder, are transferred to the forme cylinder and lead to pressure disturbances. This is counteracted with the use of the ionizing bars, as well as the color fog.
  • the invention can be used not only on web presses but also on sheet-fed rotary printing presses, for example in a printing unit designed according to FIG. 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)

Abstract

The invention relates to a printing unit for waterless offset printing. The dynamics of the printing unit are to be improved and the build-up of printing ink on the rubber blanket is to be avoided. For this purpose, the form cylinder (5, 6, 43, 71) bears a sleeve-like printing form (67) and/or the transfer cylinder (3, 4, 72) bears a sleeve-like transfer form, and the printing and transfer form (67) can be slid onto or off the respective cylinder. <IMAGE>

Description

Die Erfindung betrifft ein Druckwerk für wasserlosen Offsetdruck nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a printing unit for waterless offset printing according to the preamble of patent claim 1.

Die DE 42 02 544 A1 zeigt eine Blasluft-Kühlvorrichtung, mit der zwecks Druckens im wasserlosen Offset-Verfahren die Druckform gekühlt wird. Hierzu ist entlang dem Formzylinder ein Blasbalken angestellt, der mittels Ventilatoren Luft durch einen wassergekühlten Wärmetauscher ansaugt und gegen den Formzylinder bläst. Nachteilig ist, daß sich bei derartigen Druckwerken der Übertragungszylinder sehr erwärmt. Diese Wärme entsteht bei der großen Walkarbeit des Gummituches und kann wegen wenig guten Wärmeübergangs zu Nachbarzylindern nur unbedeutend abfließen. Auf dem warmen Übertragungszylinder baut sich Druckfarbe auf, das heißt, die Druckpunkte führen zu viel Farbe. Der Drucker ist dadurch, Maschinenstillstandszeiten verursachend, genötigt, die Drucktücher häufig zu waschen. Ansonsten würde der Druck verschmieren. Außerdem erhöhen die Farbanhäufungen auf dem Gummituch beim Abwälzen des Übertragungszylinders mit dem Form- und mit dem Gegendruckzylinder die Pressung und führen so zur Zerstörung des Gummituches. Auch verursachen die Kanäle zur Spannung des Gummituches oder einer endlichen Druckform Maschinenschwingungen und verringern die zum Drucken nutzbare Mantelfläche eines Formzylinders bzw. Übertragungszylinders. Weiterhin ist der Wechsel einer endlichen Druckform zeitaufwendig.DE 42 02 544 A1 shows a blown air cooling device with which the printing form is cooled for the purpose of printing in the waterless offset method. For this purpose, a blow bar is placed along the forme cylinder, which sucks in air through a water-cooled heat exchanger by means of fans and blows against the forme cylinder. The disadvantage is that the transfer cylinder heats up very much in such printing units. This heat is generated during the large flexing work of the rubber blanket and can only flow off insignificantly due to the poor heat transfer to neighboring cylinders. Ink builds up on the warm transfer cylinder, which means that the pressure points lead to too much ink. The printer is forced to wash the printing blankets frequently, causing machine downtimes. Otherwise the pressure would smear. In addition, the accumulation of ink on the rubber blanket increases the pressure when the transfer cylinder is rolled with the form cylinder and with the impression cylinder and thus leads to the destruction of the rubber blanket. The channels for tensioning the blanket or a finite printing form also cause machine vibrations and reduce the surface area of a forme cylinder or transfer cylinder that can be used for printing. Furthermore, changing a finite printing form is time-consuming.

Es ist Aufgabe der Erfindung, das Aufbauen der Druckfarbe auf dem Gummituch bei wasserlosem Offsetdruck zu vermeiden und die Druckqualität zu verbessern. Eine übergeordnete Aufgabe ist es, die Dynamik des Druckwerkes zu verbessern.It is an object of the invention to avoid the build-up of the printing ink on the rubber blanket in the case of waterless offset printing and to improve the printing quality. An overriding task is to improve the dynamics of the printing unit.

Diese Aufgabe wird erfindungsgemäß durch die gegenständlichen Merkmale des kennzeichnenden Teils der unabhängigen Ansprüche gelöst. Durch den Einsatz einer hülsenförmigen Druckform und/oder Übertragungsform wird der Erregung von Maschinenschwingungen vorgebeugt, und zwar am wirkungsvollsten, wenn sowohl Druckformals auch Übertragungsformhülsen zum Einsatz kommen. Dadurch kann die Druckqualität verbessert und die Leistung der Druckmaschine gesteigert werden. Auch wird die Möglichkeit des Endlosdruckens gegeben. Weiterhin sind die Hülsen schnell wechselbar.This object is achieved according to the invention by the objective features of the characterizing part of the independent claims. The use of a sleeve-shaped printing form and / or transfer form prevents the excitation of machine vibrations, and is most effective when both printing form and transfer form sleeves are used. This can improve print quality and improve press performance. The possibility of continuous printing is also given. Furthermore, the sleeves can be changed quickly.

Mit der Verwendung der Hülsen entfallen am Übertragungs- bzw. Formzylinder Kanäle zur Spannung des Gummituches bzw. der Druckform, wodurch sich die Möglichkeit ergibt, diese Zylinder in Leichtbauweise zu konzipieren. Ein solcher Zylinder wiederum läßt sich gut mit einer Innenkühlung ausstatten, die sehr wirksam kühlt.With the use of the sleeves, channels for tensioning the rubber blanket or the printing form are eliminated on the transfer cylinder or forme cylinder, which makes it possible to design these cylinders in a lightweight construction. Such a cylinder, in turn, can be well equipped with internal cooling, which cools very effectively.

Weiterhin kühlt die Blasvorrichtung die Druckform und die Übertragungsform. Letztere neigt dadurch nicht zum Aufbauen von Druckfarbe. Somit wird unter Beibehaltung normaler Gummituchwaschzyklen eine gute Druckqualität erzielt und das Gummituch geschont.Furthermore, the blowing device cools the printing form and the transfer form. As a result, the latter does not tend to build up printing ink. Thus, while maintaining normal blanket washing cycles, good print quality is achieved and the blanket is protected.

Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen in Verbindung mit der Beschreibung.Advantageous further developments result from the subclaims in connection with the description.

Die Erfindung soll nachfolgend an einigen Beispielen näher erläutert werden. In den zugehörigen Zeichnungen zeigt schematisch:

Fig. 1:
eine Druckeinheit mit zwei Druckwerken für wasserlosen Offsetdruck in der Seitenansicht,
Fig. 2:
die Innenkühlung der Farbreibzylinder, der Farbkastenwalzen, der Übertragungs- und der Formzylinder,
Fig. 3:
einen Formzylinder im Schnitt,
Fig. 4:
eine Druckeinheit in der Draufsicht mit einer Vorrichtung zur Regelung der Temperatur der Seitenwände,
Fig. 5:
ein Dreizylinderdruckwerk.
The invention will be explained in more detail below using a few examples. The accompanying drawings show schematically:
Fig. 1:
a printing unit with two printing units for waterless offset printing in side view,
Fig. 2:
the internal cooling of the ink rubbing cylinders, the ink fountain rollers, the transfer and the form cylinders,
Fig. 3:
a section cylinder in section,
Fig. 4:
a printing unit in plan view with a device for regulating the temperature of the side walls,
Fig. 5:
a three-cylinder printing unit.

Die in Fig. 1 dargestellte Druckeinheit enthält die Druckwerke 1 und 2. Jedes Druckwerk 1, 2 weist einen Übertragungszylinder 3, 4 und einen Formzylinder 5, 6 auf. An jedem Formzylinder 5, 6 ist ein Farbwerk angeordnet, das neben dem Farbkasten und diversen Farbwalzen jeweils eine Farbkastenwalze 7, 8 und drei Farbreibzylinder 9 bis 14 enthält. Jeweils einem Übertragungs- und Formzylinder 3, 5 und 4, 6 ist längs ihrer Achsen je eine Blasvorrichtung 15, 16 zugeordnet, das heißt, deren Blasöffnung 17 ist auf den Übertragungs- und den Formzylinder 3, 5 bzw. 4, 6 gerichtet. Jede Blasvorrichtung 15, 16 enthält einen Wärmetauscher 18, der an einen Zufluß 19 und einen Abfluß 20 für ein Kühlmittel angeschlossen ist. Letzteres wird von einer nicht dargestellten Kühlstation geliefert.The printing unit shown in FIG. 1 contains the printing units 1 and 2. Each printing unit 1, 2 has a transfer cylinder 3, 4 and a forme cylinder 5, 6. An inking unit is arranged on each forme cylinder 5, 6 and contains an ink fountain roller 7, 8 and three ink rubbing cylinders 9 to 14 in addition to the ink fountain and various ink rollers. A blowing device 15, 16 is assigned to each of a transfer and forme cylinder 3, 5 and 4, 6, that is, its blowing opening 17 is directed towards the transfer and forme cylinder 3, 5 and 4, 6, respectively. Each blowing device 15, 16 contains a heat exchanger 18 which is connected to an inlet 19 and an outlet 20 for a coolant. The latter is supplied by a cooling station, not shown.

Im Druckbetrieb sind die beiden Übertragungszylinder 3, 4 gegeneinander angestellt und bedrucken die zwischen ihnen hindurchgeführte Bahn 21. Dabei wird das Druckbild der auf den Formzylindern 5, 6 gespannten Druckformen eingefärbt, auf die Übertragungszylinder 3, 4 übertragen und von diesen beidseitig auf die Bahn 21 aufgetragen. Jede Blasvorrichtung 15, 16 saugt mittels Gebläse über den Ansaugkanal 22 und den vom Kühlmittel durchflossenen Wärmetauscher 18 Luft an. Diese kühlt sich dabei ab und wird anschließend gegen den Übertragungszylinder 3 bzw. 4 und den Formzylinder 5 bzw. 6 geblasen. Diese Zylinder kühlen sich dabei ab.In the printing operation, the two transfer cylinders 3, 4 are positioned against each other and print on the web 21 passed between them. The print image of the printing forms stretched on the forme cylinders 5, 6 is inked, transferred to the transfer cylinders 3, 4 and from these to the web 21 on both sides applied. Each blowing device 15, 16 draws in air by means of a fan via the intake duct 22 and the heat exchanger 18 through which the coolant flows. This cools down and is then blown against the transfer cylinder 3 or 4 and the forme cylinder 5 or 6. These cylinders cool down.

Es können wahlweise auch noch weitere nachfolgend beschriebene Kühlmöglichkeiten eingesetzt werden. Dies wird insbesondere beim Rollendruck mit seinen höheren Druckgeschwindigkeiten angezeigt sein. Einmal können für die Übertragungs- und die Formzylinder getrennte Blasvorrichtungen vorgesehen sein. Dann können auch die Übertraguns-, Form- und Farbreibzylinder sowie die Farbkastenwalzen mit Innenkühlungen, beispielsweise Wasserkühlungen, ausgestattet sein. Eine Variante ist in Fig. 2 dargestellt. Hier verzweigt sich ein Zufluß 23 für das Kühlmittel unter Zwischenschaltung jeweils eines Regelventils 24 bis 26, 41 auf die beiden Farbkastenwalzen 7, 8, die 6 Farbreibzylinder 9 bis 14, die beiden Übertragungszylinder 3, 4 und die beiden Formzylinder 5, 6. Der Anschluß erfolgt am bedienseitigen Zapfen der Zylinder. Dort ist auch der Abfluß 27 angeschlossen. Die Betätigung der Regelventile 24 bis 26 und 41 erfolgt mittels Thermosensoren, beispielsweise Infrarotsensoren, unter Zwischenschaltung von Reglern. Hierzu ist an der Farbkastenwalze 7, dem Farbreibzylinder 10, dem Übertragungszylinder 3 und dem Formzylinder 5 jeweils ein Thermosensor 28 bis 31 angeordnet. Der Thermosensor 28 ist für das Regelventil 24, der Thermosensor 29 für das Regelventil 25, der Thermosensor 30 für das Regelventil 26 und der Thermosensor 31 für das Regelventil 41 vorgesehen. Die Regler sind in der Regeleinrichtung 42 (Fig. 2) enthalten. Es ist weiterhin der Thermosensor 31 zusammen mit dem Thermosensor 29 auf einen gemeinsamen Regler geführt.Optionally, further cooling options described below can also be used. This will be indicated especially in the case of roll printing with its higher printing speeds. Once can for the transfer and forme cylinders separate blowing devices may be provided. Then the transfer, form and ink rubbing cylinders as well as the ink fountain rollers can be equipped with internal cooling, for example water cooling. A variant is shown in Fig. 2. Here, an inflow 23 for the coolant branches with the interposition of a control valve 24 to 26, 41 on the two ink fountain rollers 7, 8, the 6 inking cylinders 9 to 14, the two transfer cylinders 3, 4 and the two forme cylinders 5, 6. The connection takes place on the operator side of the cylinder. The drain 27 is also connected there. The control valves 24 to 26 and 41 are actuated by means of thermal sensors, for example infrared sensors, with the interposition of controllers. For this purpose, a thermal sensor 28 to 31 is arranged on the ink fountain roller 7, the inking cylinder 10, the transfer cylinder 3 and the forme cylinder 5. The thermal sensor 28 is provided for the control valve 24, the thermal sensor 29 for the control valve 25, the thermal sensor 30 for the control valve 26 and the thermal sensor 31 for the control valve 41. The regulators are contained in the regulating device 42 (FIG. 2). Furthermore, the thermal sensor 31 is guided together with the thermal sensor 29 to a common controller.

Je nach der Abweichung der von den Thermosensoren 28 bis 31 abgegebenen Signale vom Sollwert wird das zugehörige Regelventil 24 bis 26 und 41 weiter geöffnet oder geschlossen und damit die dem entsprechenden Zylinder zuzuführende KÜhlmittelmenge vergrößert oder verkleinert. Das Kühlmittel wird von einer Kühlstation mit einer niedrigen Temperatur zugeführt, beispielsweise 12 Grad C. Das Farbwerk wird auf eine Temperatur von etwa 25 bis 27 Grad C abgekühlt, die Druckplatte auf etwa 28 bis 30 Grad C und der Übertragungszylinder auf etwa 34 bis 35 Grad C. Die Temperatur der Farbkastenwalze wird vorteilhaft höher gehalten, als die Farbwerkstemperatur, beispielsweise auf 28 bis 30 Grad C, weil ansonsten die Farbe Fäden zieht und die Farbabgabe dadurch gestört wird. Diese Vorgehensweise wird dank separater Regelkreisläufe ermöglicht. Eine Teilkühlung des Formzylinders ist mit dem Farbwerk dank der Anlage der Auftragwalzen mit dicken Farbschichten und dem Farbübertrag selbst bereits gut möglich. Es kann deshalb auch die Regelung der Formzylindertemperatur unter Entfall des Thermosensors 29 lediglich mit dem Thermosensor 31 erfolgen.Depending on the deviation of the signals emitted by the thermal sensors 28 to 31 from the target value, the associated control valve 24 to 26 and 41 is opened or closed further and thus the amount of coolant to be supplied to the corresponding cylinder is increased or decreased. The coolant is supplied from a cooling station at a low temperature, for example 12 degrees C. The inking unit is cooled to a temperature of approximately 25 to 27 degrees C, the printing plate to approximately 28 to 30 degrees C and the transfer cylinder to approximately 34 to 35 degrees C. The temperature of the ink fountain roller is advantageously kept higher than the inking unit temperature, for example to 28 to 30 degrees C, because otherwise the ink pulls strings and the ink delivery is thereby disturbed. This procedure is made possible thanks to separate control loops. The inking unit partially cools the forme cylinder Thanks to the application of the application rollers with thick layers of ink and the ink transfer itself, this is already possible. It is therefore also possible to regulate the forme cylinder temperature by eliminating the thermal sensor 29 only with the thermal sensor 31.

Die Anwendung einer Innenkühlung bei Übertragungs- und Formzylindern ist dann besonders angezeigt, wenn mit einem Sleeve gearbeitet wird, weil dann der Zylinder unter Entfall eines Spannkanales dünnwandig in Leichtbauweise ausgeführt werden kann. Die Gestaltung eines derartigen Formzylinders 43 zeigt Fig. 3, wobei ein Übertragungszylinder einen gleichartigen Aufbau haben kann. Der Formzylinder 43 ist mit seinen Zapfen 44, 45 in Seitenwänden 46, 47 gelagert. Die Zapfen 44, 45 besitzen Flansche 48, 49 mit denen sie in einem Zylindermantelrohr 50 aufgenommen werden. Weiterhin ist in den Flanschen 48, 49 ein Trennrohr 51 und ein Zuflußrohr 52 befestigt. Das Trennrohr 51 bildet zusammen mit dem Zylindermantelrohr 50 eine Kühlkammer 53 und mit dem Zuflußrohr 52 eine Druckkammer 54. Die Kühlkammer 53 ist über Verbindungsbohrungen 55 im Flansch 48 mit dem Zuflußrohr 52 und über Verbindungsbohrungen 56 im Flansch 49 mit einem Abführkanal 57 verbunden. Das Zuflußrohr 52 und der Abführkanal 57 führen durch den antriebsseitigen Zapfen 45 hindurch zu einem auf diesem angeordneten Anschlußkopf 58. Auf dem Zapfen 45 ist weiterhin ein Stirnrad 59 für den Antrieb des Zylinders montiert.The use of internal cooling for transfer and forme cylinders is particularly indicated when working with a sleeve, because the cylinder can then be made thin-walled and lightweight with the omission of a tensioning channel. The design of such a forme cylinder 43 is shown in FIG. 3, wherein a transfer cylinder can have a similar structure. The forme cylinder 43 is mounted with its pins 44, 45 in side walls 46, 47. The pins 44, 45 have flanges 48, 49 with which they are received in a cylinder jacket tube 50. Furthermore, a separating tube 51 and an inflow tube 52 are fastened in the flanges 48, 49. The separating tube 51 forms a cooling chamber 53 together with the cylinder jacket tube 50 and a pressure chamber 54 with the inflow tube 52. The cooling chamber 53 is connected to the inflow tube 52 via connecting bores 55 in the flange 48 and to a discharge channel 57 via connecting bores 56 in the flange 49. The inflow pipe 52 and the discharge duct 57 lead through the drive-side pin 45 to a connection head 58 arranged thereon. A spur gear 59 for driving the cylinder is also mounted on the pin 45.

Der Formzylinder 43 trägt am antriebsseitigen Rand seines Mantels 78 eine Anschlußbohrung 60 für Druckluft. Diese steht über einen Kanal 61 mit der Druckkammer 54 in Verbindung. Von letzterer führt ein Kanal 62 zu einer Ringnut 63, von der Radialbohrungen 64 am bedienseitigen Rand aus dem Zylindermantel 78 herausführen. An den Anschlußkopf 58 ist eine Zuleitung 65 und eine Ableitung 66 für das Kühlmittel angeschlossen. Das Kühlmittel fließt durch das Zuflußrohr 52 über die Verbindungsbohrungen 55 zur Kühlkammer 53, von der es über die Verbindungsbohrungen 56, den Abführkanal 57 und den Anschlußkopf 58 wieder aus dem Formzylinder 43 herausgeleitet wird.The forme cylinder 43 has a connection bore 60 for compressed air on the drive-side edge of its jacket 78. This is connected to the pressure chamber 54 via a channel 61. From the latter, a channel 62 leads to an annular groove 63, from which radial bores 64 lead out of the cylinder jacket 78 on the operator-side edge. A supply line 65 and a discharge line 66 for the coolant are connected to the connection head 58. The coolant flows through the inflow pipe 52 via the connection bores 55 to the cooling chamber 53, from which it is conducted out of the forme cylinder 43 again via the connection bores 56, the discharge channel 57 and the connection head 58.

Beim Passieren der Kühlkammer 53 kühlt es wirkungsvoll das Zylindermantelrohr 50. Die Zirkulation in der Kühlkammer 53 kann vorteilhaft mittels spiralförmiger Leitbleche (nicht dargestellt) festgelegt werden. Zur Unterstützung des Aufschiebens oder Herunterschiebens einer hülsenförmigen Druckform 67 auf den oder von dem Formzylinder 43 läßt man aus den Radialbohrungen 64 Druckluft ausströmen. Diese wird mittels eines auf die Anschlußbohrung 60 aufgesetzten Anschlußschuhes 68 in den Formzylinder 43 eingeleitet. Die Drucklufteinleitung kann auch an der Stirnseite des Zylinderkörpers vorgesehen werden. Für den Wechsel der Druckform weist die bedienseitige Seitenwand 46 der Druckmaschine auseinanderfahrbare Lagerstücke auf, deren Bewegung durch Doppelpfeile angedeutet ist. Hierfür sind dem Fachmann aus dem Stand der Technik Lösungen bekannt, ebenso für eine Haltevorrichtung 69, die den Formzylinder 43 nach Freilegung seines Zapfens 44 in der Schwebe hält, so daß hierauf nicht näher eingegangen wird. Nach der Freilegung des Zapfens bzw. der Schaffung einer Öffnung in der Seitenwand 46 ist die hülsenförmige Druckform 67 wechselbar. Auf gleiche Art ist eine hülsenförmige Übertragungsform auf einen oder von einem Übertragungszylinder schiebbar.As it passes through the cooling chamber 53, it effectively cools the cylinder jacket tube 50. The circulation in the cooling chamber 53 can advantageously be determined by means of spiral baffles (not shown). To support the pushing or pushing down of a sleeve-shaped printing form 67 onto or from the forme cylinder 43, 64 compressed air can flow out of the radial bores. This is introduced into the forme cylinder 43 by means of a connection shoe 68 placed on the connection bore 60. The introduction of compressed air can also be provided on the end face of the cylinder body. To change the printing form, the operator-side side wall 46 of the printing press has bearing pieces that can be moved apart, the movement of which is indicated by double arrows. Solutions for this are known to the person skilled in the art from the prior art, likewise for a holding device 69 which holds the forme cylinder 43 in suspension after its pin 44 has been exposed, so that this will not be discussed in more detail. After the pin has been exposed or an opening has been made in the side wall 46, the sleeve-shaped printing form 67 can be changed. In the same way, a sleeve-shaped transfer form can be pushed onto or from a transfer cylinder.

Gemäß Fig. 4 wird das umzupumpende Schmiermittel des Getriebekastens 32 der Antriebsseitenwand 33 über einen Wärmetauscher 34 geleitet. Durch letzteren fließt das Kühlmittel eines Kühlmittelskreislaufes. Im Vorlauf dieses Kreislaufes liegt ein Regelventil 36, das von einem Regler 37 angesteuert wird. Auf den Regler 37 sind eingangsseitig die Ausgänge zweier Thermosensoren 38, 39 geführt, von denen einer an der Antriebsseitenwand 33 und einer an der Bedienseitenwand 40 angeordnet ist. Als Thermosensoren kommen vorteilhaft Widerstandsthermometer zur Anwendung, wobei sich vor allem Platin (Pt 100) gut eignet, weil sich dessen Widerstand proportional mit der Temperatur ändert.4, the lubricant to be pumped around the gearbox 32 of the drive side wall 33 is passed via a heat exchanger 34. The coolant of a coolant circuit flows through the latter. In the flow of this circuit is a control valve 36, which is controlled by a controller 37. The outputs of two thermal sensors 38, 39 are guided on the input side of the controller 37, one of which is arranged on the drive side wall 33 and one on the operating side wall 40. Resistance thermometers are advantageously used as thermal sensors, whereby platinum (Pt 100) is particularly suitable because its resistance changes proportionally with the temperature.

Der Regelkreis dient dazu, die Antriebsseitenwand 33 und die Bedienseitenwand 40 auf gleicher Temperatur zu halten. Normalerweise weist die Antriebsseitenwand 33 aufgrund der in Wärme umgewandelten Reibungsverluste der Getriebe des Getriebekastens 32 eine höhere Temperatur als die Bedienseitenwand 40 auf. Die Folge ist ein nicht gleichbleibender Temperaturverlauf über die Länge der in den Seitenwänden 33, 40 gelagerten Zylinder. Entsprechend sind die Temperaturverhältnisse der gelagerten Zylinder über ihre Länge nicht optimal festlegbar. Der Regler 37 ist so eingestellt, daß bei gegenüber der Bedienseitenwand 40 höherer Temperatur der Antriebsseitenwand 33 das Regelventil 36 öffnet und damit mit entsprechendem Durchsatz von Kühlmittel durch den Wärmetauscher 34 das Schmiermittel des Getriebekastens 32 kühlt. Dieses wiederum kühlt bei seiner Zirkulation die Antriebsseitenwand 33 auf die Temperatur der Bedienseitenwand 40 ab. Mit der Temperaturgleichheit beider Seitenwände wird die Temperaturkonstanz der Druckwerkszylinder über ihre Länge gegeben und eine Voraussetzung für eine gute Druckqualität über die gesamte Druckbreite geschaffen.The control loop serves to keep the drive side wall 33 and the operating side wall 40 at the same temperature. Normally, the drive side wall 33 has a higher temperature than the operating side wall 40 due to the frictional losses of the gearboxes 32 that are converted into heat. The result is a non-constant temperature profile over the length of the cylinders mounted in the side walls 33, 40. Accordingly, the temperature conditions of the mounted cylinders cannot be optimally determined over their length. The controller 37 is set so that the control valve 36 opens when the temperature of the drive side wall 33 is higher than the control side wall 40 and thus cools the lubricant of the gearbox 32 with a corresponding throughput of coolant through the heat exchanger 34. This in turn cools the drive side wall 33 to the temperature of the operating side wall 40 during its circulation. With the temperature equality of both side walls, the temperature constancy of the printing unit cylinders is given over their length and a prerequisite for good print quality across the entire printing width is created.

Es ist für die Benutzung der Erfindung unbedeutend, ob die einzelnen Kühlkreisläufe von einer oder mehreren Kühlstationen mit Kühlmittel versorgt werden. Auch können die Druckwerke kostenaufwendig separat mit Regelkreisen ausgestattet werden. Umgekehrt dazu können unter Kostenersparnis bereits gute Ergebnisse erzielt werden, wenn weitere Druckeinheiten an die Regeleinrichtungen des Druckwerkes 1 angeschlossen werden. Auch können bei den Blasvorrichtungen der Kühlmittelzulauf und die Gebläseleistung geregelt werden. Als Kühlmittel wird vorteilhaft Wasser eingesetzt.It is insignificant for the use of the invention whether the individual cooling circuits are supplied with coolant by one or more cooling stations. The printing units can also be equipped separately with control loops at great expense. Conversely, good results can already be achieved with cost savings if additional printing units are connected to the control devices of the printing unit 1. The coolant supply and the blower output can also be regulated in the blowing devices. Water is advantageously used as the coolant.

Weiterhin können die Kühlmittelkreisläufe in der Vorbereitungsphase für den Druckbetrieb zur Vorwärmung der Druckwerke benutzt werden, indem hierfür zunächst ein entsprechend erwärmtes Kühlmittel zugeführt wird. Es wird dadurch das Rupfen der Farbe beim Druckbeginn mit einhergehender Ansammlung von Papierpartikeln im Farbwerk vermieden.Dies ist sehr bedeutsam, da beim wasserlosen Offsetdruck das Feuchtwerk fehlt, das sonst Partikel aus dem Druckwerk abführen könnte. Die Kühlstation wird dann so geregelt, daß im Fortdruck die Kühlmitteltemperatur allmählich absinkt. Zwecks Druckwerkvorwärmung bedient sich der Drucker der beschriebenen sowie der in den Figuren 1 und 2 gezeigten Kühlkreisläufe und stellt am Thermostat der nicht dargestellten Kühlstation einen höheren Temperaturwert der Kühlmitteltemperatur ein, vorteilhaft die Betriebstemperatur der Farbreibzylinder. Im Druckbetrieb stellt dann der Drucker die Kühlmitteltemperatur allmählich niedriger entsprechend der höheren Kühlerfordernis infolge der Eigenerwärmung des Druckwerkes, dessen Temperatur an einem Thermometer ablesbar ist. Der Temperaturverlauf des Kühlmittels für die Vorwärmung kann auch nach einer in eine Speichereinheit eingegebene Temperatur - Zeit - Kurve oder an Hand eines Temperatursensors, beispielsweise an einem Farbreibzylinder, in Verbindung mit einem Regler, geregelt werden. Es kann z. B. der Thermosensor 29 am Farbreibzylinder 10 verwendet werden. Die Speichereinheit kann in der Regeleinrichtung 42 untergebracht werden.Furthermore, the coolant circuits can be used in the preparation phase for the printing operation for preheating the printing units by first supplying a correspondingly heated coolant. This will cause the ink to pick when printing starts with the accumulation of paper particles in the This is very important because waterless offset printing lacks the dampening system that could otherwise remove particles from the printing unit. The cooling station is then regulated in such a way that the coolant temperature gradually drops in the production run. For the purpose of preheating the printing unit, the printer uses the cooling circuits described and those shown in FIGS. 1 and 2 and sets a higher temperature value of the coolant temperature on the thermostat of the cooling station (not shown), advantageously the operating temperature of the ink rubbing cylinders. In printing operation, the printer then gradually lowers the coolant temperature in accordance with the higher cooling requirement due to the self-heating of the printing unit, the temperature of which can be read off from a thermometer. The temperature profile of the coolant for preheating can also be regulated according to a temperature-time curve entered in a storage unit or using a temperature sensor, for example on a color friction cylinder, in connection with a controller. It can e.g. B. the thermal sensor 29 on the ink cylinder 10 can be used. The storage unit can be accommodated in the control device 42.

Eine Bahn kann auch im sogenannten Di-Litho-Verfahren bedruckt werden. Ein diesbezüglicher Bahnverlauf ist in Fig. 1 gestrichelt eingezeichnet. Die Bahn 70 wird zwischen dem Übertragungszylinder 4 und dem Formzyliner 6 hindurchgeführt und dabei von letzterem bedruckt. Beim anschließenden Durchgang der Bahn 70 zwischen dem Übertragungszylinder 4 und dem Übertragungszylinder 3 wird auf die bedruckte Bahnseite eine zweite Farbe gedruckt, so daß ein 2 + O-Druck entsteht.A web can also be printed using the so-called di-litho process. A relevant course of the path is shown in dashed lines in FIG. 1. The web 70 is passed between the transfer cylinder 4 and the form cylinder 6 and thereby printed by the latter. During the subsequent passage of the web 70 between the transfer cylinder 4 and the transfer cylinder 3, a second color is printed on the printed web side, so that a 2 + O print is produced.

Das Druckwerk kann auch statt mit dem Übertragungszylinder eines weiteren Druckwerkes auch mit einem eigentlichen Gegendruckzylinder zusammenarbeiten. Ein solches Dreizylinder-Druckwerk zeigt Fig. 5. Es enthält einen Formzylinder 71, einen Übertragungszylinder 72 und einen Gegendruckzylinder 73. Der Formzylinder 71 wird von einem Kurzfarbwerk, und zwar einem Anilox-Farbwerk, eingefärbt. Dieses enthält eine von einer Kammerrakel 74 eingefärbte Rasterwalze 75 sowie eine Auftragwalze 76. Die Rasterwalze 75 färbt die Auftragwalze 76 ein, die wiederum die Druckform des Formzylinders 71 einfärbt. Letztere übergibt das Druckbild auf den Übertragungszylinder 72, der auf die Bahn 77 druckt. Die Kühlvorrichtungen wurden der Einfachheit halber nicht dargestellt.The printing unit can also cooperate with an actual impression cylinder instead of with the transfer cylinder of another printing unit. Such a three-cylinder printing unit is shown in FIG. 5. It contains a forme cylinder 71, a transfer cylinder 72 and an impression cylinder 73. The forme cylinder 71 is inked by a short inking unit, namely an anilox inking unit. This contains an anilox roller 75 inked by a chambered doctor blade 74 and an applicator roller 76. The anilox roller 75 dyes the applicator roller 76, which in turn inked the printing form of the forme cylinder 71. The latter transfers the print image to the transfer cylinder 72, which prints on the web 77. The cooling devices have not been shown for the sake of simplicity.

Vorteilhaft kommen bei Druckwerken für wasserlosen Offsetdruck auch Ionisierungsstäbe zur Beseitigung elektrostatischer Aufladungen zur Anwendung. Im Ausführungsbeispiel gemäß Fig. 1 ind Ionisierungsstäbe 79, 80 beiderseits der Bahn 21 nach ihrem Durchgang zwischen den sie bedruckenden Übertragungszylindern 3, 4 angeordnet. Ionisierungsstäbe können auch vor oder vor und nach den die Bahn 21 bedruckenden Zylindern angeordnet sein. Die beim wasserlosen Offsetdruck trockenere Bahn neigt verstärkt zu elektrostatischer Aufladung mit entsprechend kräftiger Anziehung von Staubpartikeln aus der Umgebung. Diese setzen sich auf dem Übertragungszylinder ab, werden an den Formzylinder übergeben und führen zu Druckstörungen. Dem wird mit dem Einsatz der Ionisierungsstäbe entgegengewirkt, ebenso dem Farbnebeln. Weiterhin werden empfindliche elektronische Bauelemente geschützt, die, hohen elektrischen Feldern ausgesetzt, ge- oder zerstört werden können. Schließlich wird mit dem Abbau der elektrostatischen Aufladung das Lösen der Bahn von den sie bedruckenden Zylindern gefördert, was die Möglichkeit eröffnet, mit geringerer Bahnspannung zu drucken und somit auch leichtere Papiere bei geringer Bahnrißgefahr verarbeiten zu können.Ionizing bars for eliminating electrostatic charges are also advantageously used in printing units for waterless offset printing. In the exemplary embodiment according to FIG. 1, ionizing rods 79, 80 are arranged on both sides of the web 21 after their passage between the transfer cylinders 3, 4 which print on them. Ionizing bars can also be arranged in front of or in front of and after the cylinders printing on the web 21. The web, which is drier in waterless offset printing, tends to electrostatically charge with a correspondingly strong attraction of dust particles from the environment. These settle on the transfer cylinder, are transferred to the forme cylinder and lead to pressure disturbances. This is counteracted with the use of the ionizing bars, as well as the color fog. It also protects sensitive electronic components that can be exposed to, damaged or destroyed by high electrical fields. Finally, with the removal of the electrostatic charge, the release of the web from the cylinders printing on it is promoted, which opens up the possibility of printing with a lower web tension and thus also being able to process lighter papers with a low risk of web breakage.

Die Erfindung ist nicht nur an Rollen- sondern auch an Bogenrotationsdruckmaschinen anwendbar, beispielsweise bei einem gemäß Fig. 5 gestalteten Druckwerk.The invention can be used not only on web presses but also on sheet-fed rotary printing presses, for example in a printing unit designed according to FIG. 5.

Claims (16)

Druckwerk für wasserlosen Offsetdruck mit einem Form-, einem Übertragungs- und einem Gegendruckzylinder, einem an dem Formzylinder angeordneten Farbwerk und einer Kühlvorrichtung, dadurch gekennzeichnet, daß der Formzylinder (5, 6, 43, 71) eine hülsenförmige Druckform (67) und/oder der Übertragungszylinder (3, 4, 72) eine hülsenförmige Übertragungsform trägt und die Druck- und Übertragungsform (67) durch eine freilegbare Öffnung einer Maschinenseitenwand auf den oder von dem jeweiligen Zylinder schiebbar ist.Printing unit for waterless offset printing with a forme, a transfer and an impression cylinder, an inking unit arranged on the forme cylinder and a cooling device, characterized in that the forme cylinder (5, 6, 43, 71) is a sleeve-shaped printing form (67) and / or the transfer cylinder (3, 4, 72) carries a sleeve-shaped transfer form and the printing and transfer form (67) can be pushed onto or from the respective cylinder through an exposed opening of a machine side wall. Druckwerk für wasserlosen Offsetdruck, insbesondere nach Anspruch 1, dadurch gekennzeichnet, daß der Übertragungszylinder (3, 4, 72) mit einer Innenkühlung ausgestattet ist.Printing unit for waterless offset printing, in particular according to claim 1, characterized in that the transfer cylinder (3, 4, 72) is equipped with internal cooling. Druckwerk für wasserlosen Offsetdruck nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Formzylinder (5, 6, 43, 71) mit einer Innenkühlung ausgestattet ist.Printing unit for waterless offset printing according to claim 1 or 2, characterized in that the forme cylinder (5, 6, 43, 71) is equipped with internal cooling. Druckwerk für wasserlosen Offsetdruck, nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Farbreibzylinder (9 bis 14) mit einer Innenkühlung ausgestattet sind.Printing unit for waterless offset printing, according to one of the preceding claims, characterized in that the ink rubbing cylinders (9 to 14) are equipped with internal cooling. Druckwerk für wasserlosen Offsetdruck, insbesondere nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Farbkastenwalze (7, 8) mit einer Innenkühlung ausgestattet ist.Printing unit for waterless offset printing, in particular according to one of the preceding claims, characterized in that the ink fountain roller (7, 8) is equipped with internal cooling. Druckwerk nach einem der Ansprüche 2 bis 5 mit einem Zylinder, insbesondere Form- oder Übertragungszylinder, dadurch gekennzeichnet, daß der Zylinder (43) in Leichtbauweise hergestellt ist, ein Zapfen (45) einen Anschlußkopf (58) für die Zu- und Abführung des Kühlmittels trägt und der Zapfen (45) einen Zu- und einen Abführkanal (52, 57) aufweist.Printing unit according to one of claims 2 to 5 with a cylinder, in particular a forme or transfer cylinder, characterized in that the cylinder (43) is made of lightweight construction, a pin (45) a connection head (58) for the supply and discharge of the coolant carries and the pin (45) has a supply and a discharge channel (52, 57). Druckwerk nach Anspruch 6, dadurch gekennzeichnet, daß der Mantel (78) des Zylinderkörpers Radialbohrungen (64) aufweist und am Mantel (78) oder der Stirnseite des Zylinderkörpers eine Anschlußbohrung (60) für Druckluft angeordnet ist, auf die ein Anschlußschuh (68) für Druckluft aufsetzbar ist.Printing unit according to claim 6, characterized in that the jacket (78) of the cylinder body has radial bores (64) and a connection bore (60) for compressed air is arranged on the jacket (78) or the end face of the cylinder body, onto which a connection shoe (68) for Compressed air can be placed. Druckwerk für wasserlosen Offestdruck, insbesondere nach einem der vorhergehenden Ansprüche, mit einer Blasvorrichtung (15, 16) zur Zylinderkühlung, die sich über die Breite des Zylindermantels erstreckend angeordnet ist, dadurch gekennzeichnet, daß die Blasvorrichtung (15, 16) derart angeordnet ist, daß die Blasluft sowohl den Übertragungszylinder (3, 4) als auch den Formzylinder (5, 6) bestreicht.Printing unit for waterless offset printing, in particular according to one of the preceding claims, with a blowing device (15, 16) for cylinder cooling, which is arranged to extend over the width of the cylinder jacket, characterized in that the blowing device (15, 16) is arranged such that the blown air sweeps both the transfer cylinder (3, 4) and the forme cylinder (5, 6). Druckwerk nach Anspruch 8, dadurch gekennzeichnet, daß beiderseits der zu bedruckenden Bahn jeweils eine Blasvorrichtung (15, 16) angeordnet ist.Printing unit according to claim 8, characterized in that a blowing device (15, 16) is arranged on each side of the web to be printed. Druckwerk für wasserlosen Offsetdruck, insbesondere nach einem der Ansprüche 2 bis 9, dadurch gekennzeichnet, daß an einem Farbreibzylinder (10) und/oder dem Formzylinder (5) und/oder dem Übertragungszylinder (3) und/oder der Farbkastenwalze (7) jeweils ein Thermosensor (29, 31, 30, 28) angeordnet ist, der über einen Regler mit dem Regelventil (25, 26, 24, 41) für den Kühlmittelzulauf der Innenkühlung des entsprechenden zu beeinflussenden Zylinders in Verbindung steht.Printing unit for waterless offset printing, in particular according to one of claims 2 to 9, characterized in that in each case on a ink rubbing cylinder (10) and / or the forme cylinder (5) and / or the transfer cylinder (3) and / or the ink fountain roller (7) Thermosensor (29, 31, 30, 28) is arranged, which is connected via a controller to the control valve (25, 26, 24, 41) for the coolant supply for the internal cooling of the corresponding cylinder to be influenced. Druckwerk für wasserlosen Offsetdruck, insbesondere nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß Wärmetauscher (18) der Blasvorrichtung (15, 16) sowie die Innenkühlung an eine oder mehrere Kühlstationen angeschlossen sind, die wahlweise erwärmtes, allmählich in der Temperatur abgesenktes Kühlmittel erzeugen.Printing unit for waterless offset printing, in particular according to one of claims 1 to 10, characterized in that the heat exchanger (18) of the blowing device (15, 16) and the internal cooling are connected to one or more cooling stations which selectively heat coolant which is gradually reduced in temperature produce. Druckwerk für wasserlosen Offsetdruck, insbesondere nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Schmiermittel des Getriebekastens (32) der Antriebsseitenwand (33) über einen Wärmetauscher (34) zirkuliert, dessen Kühlmittelzulauf von einem Regelventil (36) geregelt wird, das von einem Regler (37) betätigt wird, auf den zwei an der Antriebs- (33) und der Bedienseitenwand (40) angeordnete Thermosensoren (39, 40) geführt sind.Printing unit for waterless offset printing, in particular according to one of the preceding claims, characterized in that the lubricant of the gearbox (32) of the drive side wall (33) circulates via a heat exchanger (34), the coolant supply of which is regulated by a control valve (36) which is controlled by a Controller (37) is actuated, on which two thermal sensors (39, 40) arranged on the drive (33) and the operating side wall (40) are guided. Druckwerk nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß als Gegendruckzylinder der Übertragungszylinder (5, 6) eines weiteren Druckwerkes fungiert.Printing unit according to one of the preceding claims, characterized in that the transfer cylinder (5, 6) of a further printing unit functions as the impression cylinder. Druckwerk für wasserlosen Offsetdruck, insbesondere nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Bahn (70) zwischen dem Formzylinder (5, 6, 71) und dem Übertragungszylinder (3, 4, 72) hindurchgeführt und von diesen gegeneinander angestellten Zylindern im sogenannten Di-Litho-Verfahren bedruckt wird.Printing unit for waterless offset printing, in particular according to one of the preceding claims, characterized in that the web (70) is passed between the forme cylinder (5, 6, 71) and the transfer cylinder (3, 4, 72) and by these cylinders, which are positioned against one another in the so-called Di-litho process is printed. Druckwerk für wasserlosen Offsedruck, insbesondere nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Formzylinder (5, 6, 71) mit einem Kurzfarbwerk, beispielsweise einem Anilox-Farbwerk, eingefärbt wird.Printing unit for waterless offset printing, in particular according to one of the preceding claims, characterized in that the forme cylinder (5, 6, 71) is inked with a short inking unit, for example an anilox inking unit. Druckwerk für wasserlosen Offsetdruck, insbesondere nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß vor und/oder nach den die Bahn (21, 70, 77) bedruckenden Zylindern (3, 4, 72, 73) an die Bahn (21, 70, 77) Ionisierungsstäbe zur Beseitigung elektrostatischer Aufladungen angeordnet sind.Printing unit for waterless offset printing, in particular according to one of the preceding claims, characterized in that before and / or after the cylinders (3, 4, 72, 73) printing on the web (21, 70, 77) on the web (21, 70, 77) Ionizing bars are arranged to remove electrostatic charges.
EP94117057A 1993-11-05 1994-10-28 Printing unit for waterless offset printing Expired - Lifetime EP0652104B1 (en)

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DE9316932U DE9316932U1 (en) 1993-11-05 1993-11-05 Printing unit for waterless offset printing
DE9316932U 1993-11-05
DE4431188 1994-09-01
DE4431188A DE4431188C2 (en) 1993-11-05 1994-09-01 Printing unit for waterless offset printing

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Also Published As

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EP0652104B1 (en) 2002-04-10
US5784957A (en) 1998-07-28
JPH07186360A (en) 1995-07-25
JP2877705B2 (en) 1999-03-31
US5595115A (en) 1997-01-21

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