EP0652104B1 - Printing unit for waterless offset printing - Google Patents

Printing unit for waterless offset printing Download PDF

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Publication number
EP0652104B1
EP0652104B1 EP94117057A EP94117057A EP0652104B1 EP 0652104 B1 EP0652104 B1 EP 0652104B1 EP 94117057 A EP94117057 A EP 94117057A EP 94117057 A EP94117057 A EP 94117057A EP 0652104 B1 EP0652104 B1 EP 0652104B1
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EP
European Patent Office
Prior art keywords
forme
transfer cylinder
printing
cylinder
coolant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94117057A
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German (de)
French (fr)
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EP0652104A1 (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
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MAN Roland Druckmaschinen AG
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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
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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 form or transfer cylinder of a printing unit for waterless offset printing.
  • DE 42 02 544 A1 shows a blown air cooling device with which the printing form for printing in the waterless offset process is cooled.
  • a blow bar along the forme cylinder hired, the by means of fans air through a sucks water-cooled heat exchanger and against the forme cylinder blows.
  • the disadvantage is that in such printing units Transfer cylinder very warm. This warmth comes from the large flexing of the blanket and can because of little good The heat transfer to neighboring cylinders is only insignificant. Ink builds up on the warm transfer cylinder, that is, the pressure points lead to too much color. The printer is thereby, causing machine downtime, the Wash printing blankets frequently. Otherwise the pressure would smudging.
  • the color accumulations on the Rubber blanket when rolling the transfer cylinder with the Form and with the impression cylinder the pressure and lead so to destroy the rubber blanket.
  • the channels also cause Tension of the blanket or a finite printing form Machine vibrations and reduce the usable for printing Shell surface of a forme cylinder or transfer cylinder. Furthermore, changing a finite printing form is time-consuming.
  • the blowing device cools the printing form and the Transfer form. As a result, the latter does not tend to build up Ink. Thus, while maintaining it becomes more normal Blanket washing cycles achieved good print quality and that Protected rubber blanket.
  • 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.
  • On each forme cylinder 5, 6 an inking unit is arranged next to the ink fountain and various ink rollers, one ink fountain roller 7, 8 and three Ink cylinder 9 to 14 contains.
  • One transmission and one Forme cylinders 3, 5 and 4, 6 are each one along their axes Blower device 15, 16 assigned, that is, its blow opening 17th is on the transfer and forme cylinders 3, 5 and 4, 6th directed.
  • Each blowing device 15, 16 contains a heat exchanger 18 connected to an inlet 19 and an outlet 20 for a coolant connected. The latter is from a not shown Cooling station supplied.
  • the two transfer cylinders 3, 4 are in printing operation against each other and print the between them web 21 passed therethrough, the printed image on the Forme cylinders 5, 6 tensioned printing blocks colored on the Transfer cylinder 3, 4 and transfer from these on both sides applied to the web 21.
  • Each blowing device 15, 16 sucks by means of blowers via the intake duct 22 and the coolant flowed through heat exchanger 18 air. This cools down and is then against the transfer cylinder 3 or 4 and the forme cylinder 5 or 6 blown. These cylinders cool down doing so.
  • Cooling options are used. This is particularly the case with Roll printing appears at its higher print speeds his.
  • One time for the transfer and the form cylinders separate blowing devices may be provided. Then they can too Transfer, form and ink rubbing cylinders as well as the ink fountain rollers equipped with internal cooling, such as water cooling his.
  • a variant is shown in Fig. 2.
  • the connection is made on operator side pin of the cylinder.
  • Actuation of control valves 24 to 26 and 41 takes place by means of thermal sensors, for example infrared sensors, with the interposition of controllers. This is at the Ink fountain roller 7, the inking cylinder 10, the transfer cylinder 3 and the forme cylinder 5 each have a thermal sensor 28 to 31 arranged.
  • the thermal sensor 28 is 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 intended.
  • the regulators are in the regulating device 42 (FIG. 2) contain. It is also the thermal sensor 31 together with the Thermosensor 29 performed on a common controller.
  • the associated control valve 24 becomes the output of signals from the setpoint to 26 and 41 further open or closed and thus the the corresponding amount of coolant to be supplied corresponding to the cylinder or reduced.
  • the coolant is supplied by a cooling station with a low temperature, for example 12 degrees C.
  • Das Inking unit is heated to a temperature of around 25 to 27 degrees C. cooled, the pressure plate to about 28 to 30 degrees C and the Transfer cylinder to about 34 to 35 degrees C.
  • the temperature of the Ink fountain roller is advantageously held higher than that Inking unit temperature, for example to 28 to 30 degrees C, because otherwise the paint pulls strings and the ink delivery is disturbed becomes. This procedure is thanks to separate control loops allows.
  • the inking unit partially cools the forme cylinder thanks to the application of the application rollers with thick layers of ink and the Color transfer itself is already possible. It can therefore also Regulation of the forme cylinder temperature without the need for a 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 with its pins 44, 45 in side walls 46, 47 stored.
  • the pins 44, 45 have flanges 48, 49 with which they be accommodated in a cylinder jacket tube 50.
  • a separator tube 51 and an inflow tube 52 attached.
  • the separation tube 51 forms together with the Cylinder jacket tube 50 a cooling chamber 53 and with the inflow tube 52 a pressure chamber 54.
  • the cooling chamber 53 is over Connection bores 55 in the flange 48 with the inflow pipe 52 and over Connecting bores 56 in the flange 49 with a discharge channel 57 connected.
  • the inflow pipe 52 and the discharge channel 57 lead through the drive-side pin 45 through to an arranged on this Connection head 58.
  • On the pin 45 is a spur gear 59 for mounted the actuator of the cylinder.
  • the forme cylinder 43 carries on the drive-side edge of its jacket 78 a connection bore 60 for compressed air. This is over a channel 61 in connection with the pressure chamber 54. From the latter introduces Channel 62 to an annular groove 63, from the radial bores 64 on lead out the operator-side edge from the cylinder jacket 78.
  • To the Connection head 58 is a lead 65 and a lead 66 for the Coolant connected. The coolant flows through the inflow pipe 52 via the connecting holes 55 to the cooling chamber 53, from which it via the connecting holes 56, the discharge channel 57 and the Connection head 58 is guided out of the forme cylinder 43 again.
  • Cooling the cooling chamber 53 effectively cools it Cylinder jacket tube 50.
  • the circulation in the cooling chamber 53 can advantageously by means of spiral baffles (not shown) be determined.
  • 64 compressed air from the radial bores flow out. This is by means of a connection hole 60th attached connection shoe 68 introduced into the forme cylinder 43.
  • the compressed air can also be on the front of the Cylinder body are provided.
  • For changing the printing form has the operator side wall 46 of the printing press separable bearings on whose movement by Double arrows is indicated.
  • the specialist from the state solutions known in the art also for a holding device 69, which the forme cylinder 43 after exposure of its pin 44 in the Suspended so that it is not discussed in more detail.
  • the sleeve-shaped printing form 67 is exchangeable.
  • a sleeve-like transfer form to one or pushable by a transfer cylinder.
  • the control loop serves the drive side wall 33 and the To keep the operating side wall 40 at the same temperature.
  • the drive side wall 33 due to the frictional losses of the gearbox of the Gear box 32 a higher temperature than that Operator side wall 40 on.
  • the consequence is not one constant temperature curve over the length of the in the Side walls 33, 40 mounted cylinders. They are accordingly Temperature conditions of the stored cylinders over their length not can be optimally determined.
  • the controller 37 is set so that at compared to the operating side wall 40 of higher temperature Drive side wall 33 opens the control valve 36 and thus with corresponding throughput of coolant through the heat exchanger 34 the lubricant of the gear box 32 cools. This in turn cools the drive side wall 33 on its circulation Temperature of the operator side wall 40 from. With the temperature equality the temperature constancy of both side walls Printing unit cylinders given over their length and a requirement created for good print quality across the entire print width.
  • Cooling circuits of one or more cooling stations with coolant are supplied.
  • the printing units can also be costly separately be equipped with control loops. Conversely, under Cost savings are already good results if more Printing units to the control devices of the printing unit 1 be connected. Can also with the blowing devices Coolant supply and the blower output are regulated. As Coolant is advantageously water.
  • the coolant circuits can be in the preparation phase are used for printing to preheat the printing units, by first using a suitably heated coolant is fed. This will cause the paint to pick Start of printing with accompanying accumulation of paper particles in the Avoiding inking, which is very important since the waterless Offset printing the dampening system is missing, which otherwise particles from the Can discharge printing unit.
  • the cooling station is then regulated that the coolant temperature gradually drops in continuous printing.
  • Printer preheating uses the printer described and the cooling circuits shown in Figures 1 and 2 and provides a higher one at the thermostat of the cooling station, not shown Temperature value of the coolant temperature, advantageously the Operating temperature of the ink rubbing cylinder.
  • the temperature curve of the coolant for preheating can even after a temperature entered in a storage unit - Time curve or using a temperature sensor, for example a color friction cylinder, in connection with a controller become. It can e.g. B. the thermal sensor 29 on the ink cylinder 10 be used.
  • the storage unit can be in the control device 42 can be accommodated.
  • a web can also be printed using the so-called di-litho process become.
  • a relevant course of the path is dashed in Fig. 1 located.
  • the web 70 is between the transfer cylinder 4th and passed through the Formzyliner 6 and thereby from the latter printed.
  • the subsequent passage of the web 70 between the Transfer cylinder 4 and the transfer cylinder 3 is on the printed web side printed a second color so that a 2 + 0 pressure arises.
  • the printing unit can also be used instead of a transfer cylinder further printing unit also with an actual impression cylinder work together.
  • 5 shows such a three-cylinder printing unit. It contains a forme cylinder 71, a transfer cylinder 72 and an impression cylinder 73.
  • the forme cylinder 71 is a Short inking unit, namely an anilox inking unit, colored. This contains an anilox roller 75 colored by a chambered doctor blade 74 and an applicator roller 76.
  • the anilox roller 75 colors the Application roller 76, which in turn is the printing form of the forme cylinder 71st Inking.
  • the latter transfers the print image to the Transfer cylinder 72 that prints on web 77.
  • the Cooling devices have not been shown for the sake of simplicity.
  • the waterless one Offset printing drier web tends to be more electrostatic Charging with a correspondingly strong attraction of dust particles from the area. 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, also the color mist.
  • sensitive electronic Protected components that are exposed to high electrical fields can be damaged or destroyed.
  • the invention is not only on roles but also on Sheet-fed rotary printing presses can be used, for example in one 5 designed printing unit.

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

Description

Die Erfindung betrifft einen Form- oder Übertragungszylinder eines Druckwerkes für wasserlosen Offsetdruck.The invention relates to a form or transfer cylinder of a printing unit for waterless offset printing.

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 for printing in the waterless offset process is cooled. For this purpose there is a blow bar along the forme cylinder hired, the by means of fans air through a sucks water-cooled heat exchanger and against the forme cylinder blows. The disadvantage is that in such printing units Transfer cylinder very warm. This warmth comes from the large flexing of the blanket and can because of little good The heat transfer to neighboring cylinders is only insignificant. Ink builds up on the warm transfer cylinder, that is, the pressure points lead to too much color. The printer is thereby, causing machine downtime, the Wash printing blankets frequently. Otherwise the pressure would smudging. In addition, the color accumulations on the Rubber blanket when rolling the transfer cylinder with the Form and with the impression cylinder the pressure and lead so to destroy the rubber blanket. The channels also cause Tension of the blanket or a finite printing form Machine vibrations and reduce the usable for printing Shell surface of a forme cylinder or transfer cylinder. 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. It is an object of the invention to build up the printing ink to avoid the blanket with waterless offset printing and the Improve print quality.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 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 by the Features of claim 1 solved. By using a sleeve-shaped printing form and / or The transmission form is the excitation of machine vibrations prevented, and most effectively when both print formals Transfer form sleeves are also used. This allows the Improves print quality and press performance be increased. Also the possibility of continuous printing 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 on the transmission or Forme cylinder channels for tensioning the blanket or printing form, which gives the possibility of these cylinders in To design lightweight construction. Such a cylinder in turn leaves are well equipped with an internal cooling system that 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 Ink. Thus, while maintaining it becomes more normal Blanket washing cycles achieved good print quality and that Protected rubber blanket.

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. On each forme cylinder 5, 6 an inking unit is arranged next to the ink fountain and various ink rollers, one ink fountain roller 7, 8 and three Ink cylinder 9 to 14 contains. One transmission and one Forme cylinders 3, 5 and 4, 6 are each one along their axes Blower device 15, 16 assigned, that is, its blow opening 17th is on the transfer and forme cylinders 3, 5 and 4, 6th directed. Each blowing device 15, 16 contains a heat exchanger 18 connected to an inlet 19 and an outlet 20 for a coolant connected. The latter is from a not shown Cooling station supplied.

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.The two transfer cylinders 3, 4 are in printing operation against each other and print the between them web 21 passed therethrough, the printed image on the Forme cylinders 5, 6 tensioned printing blocks colored on the Transfer cylinder 3, 4 and transfer from these on both sides applied to the web 21. Each blowing device 15, 16 sucks by means of blowers via the intake duct 22 and the coolant flowed through heat exchanger 18 air. This cools down and is then against the transfer cylinder 3 or 4 and the forme cylinder 5 or 6 blown. These cylinders cool down doing so.

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, there may also be others described below Cooling options are used. This is particularly the case with Roll printing appears at its higher print speeds his. One time for the transfer and the form cylinders separate blowing devices may be provided. Then they can too Transfer, form and ink rubbing cylinders as well as the ink fountain rollers equipped with internal cooling, such as water cooling his. A variant is shown in Fig. 2. Here branches an inflow 23 for the coolant with interposition a control valve 24 to 26, 41 on the two ink fountain rollers 7, 8, the 6 ink rubbers 9 to 14, the two transfer cylinders 3, 4 and the two forme cylinders 5, 6. The connection is made on operator side pin of the cylinder. There is also drain 27 connected. Actuation of control valves 24 to 26 and 41 takes place by means of thermal sensors, for example infrared sensors, with the interposition of controllers. This is at the Ink fountain roller 7, the inking cylinder 10, the transfer cylinder 3 and the forme cylinder 5 each have a thermal sensor 28 to 31 arranged. The thermal sensor 28 is 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 intended. The regulators are in the regulating device 42 (FIG. 2) contain. It is also the thermal sensor 31 together with the Thermosensor 29 performed on 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 from that of the thermal sensors 28 to 31 The associated control valve 24 becomes the output of signals from the setpoint to 26 and 41 further open or closed and thus the the corresponding amount of coolant to be supplied corresponding to the cylinder or reduced. The coolant is supplied by a cooling station with a low temperature, for example 12 degrees C. Das Inking unit is heated to a temperature of around 25 to 27 degrees C. cooled, the pressure plate to about 28 to 30 degrees C and the Transfer cylinder to about 34 to 35 degrees C. The temperature of the Ink fountain roller is advantageously held higher than that Inking unit temperature, for example to 28 to 30 degrees C, because otherwise the paint pulls strings and the ink delivery is disturbed becomes. This procedure is thanks to separate control loops allows. The inking unit partially cools the forme cylinder thanks to the application of the application rollers with thick layers of ink and the Color transfer itself is already possible. It can therefore also Regulation of the forme cylinder temperature without the need for a 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 in transfer and form cylinders is particularly indicated when working with a sleeve because then the cylinder with the omission of a tensioning channel thin-walled can be carried out in lightweight construction. 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 with its pins 44, 45 in side walls 46, 47 stored. The pins 44, 45 have flanges 48, 49 with which they be accommodated in a cylinder jacket tube 50. Furthermore, in the flanges 48, 49, a separator tube 51 and an inflow tube 52 attached. The separation tube 51 forms together with the Cylinder jacket tube 50 a cooling chamber 53 and with the inflow tube 52 a pressure chamber 54. The cooling chamber 53 is over Connection bores 55 in the flange 48 with the inflow pipe 52 and over Connecting bores 56 in the flange 49 with a discharge channel 57 connected. The inflow pipe 52 and the discharge channel 57 lead through the drive-side pin 45 through to an arranged on this Connection head 58. On the pin 45 is a spur gear 59 for mounted the actuator of the cylinder.

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 carries on the drive-side edge of its jacket 78 a connection bore 60 for compressed air. This is over a channel 61 in connection with the pressure chamber 54. From the latter introduces Channel 62 to an annular groove 63, from the radial bores 64 on lead out the operator-side edge from the cylinder jacket 78. To the Connection head 58 is a lead 65 and a lead 66 for the Coolant connected. The coolant flows through the inflow pipe 52 via the connecting holes 55 to the cooling chamber 53, from which it via the connecting holes 56, the discharge channel 57 and the Connection head 58 is guided out of the forme cylinder 43 again.

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.Passing the cooling chamber 53 effectively cools it Cylinder jacket tube 50. The circulation in the cooling chamber 53 can advantageously by means of spiral baffles (not shown) be determined. To support postponement or Sliding a sleeve-shaped printing form 67 onto or off the forme cylinder 43 is allowed 64 compressed air from the radial bores flow out. This is by means of a connection hole 60th attached connection shoe 68 introduced into the forme cylinder 43. The compressed air can also be on the front of the Cylinder body are provided. For changing the printing form has the operator side wall 46 of the printing press separable bearings on whose movement by Double arrows is indicated. For this, the specialist from the state solutions known in the art, also for a holding device 69, which the forme cylinder 43 after exposure of its pin 44 in the Suspended so that it is not discussed in more detail. After Exposing the pin or creating an opening in the Side wall 46, the sleeve-shaped printing form 67 is exchangeable. On The same kind is a sleeve-like transfer form to one or pushable by 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 Gear box 32 of the drive side wall 33 via a Heat exchanger 34 passed. It flows through the latter Coolant of a coolant circuit. Ahead of this Circuit is a control valve 36 by a Controller 37 is controlled. On the controller 37 are the outputs of two thermal sensors 38, 39 on the input side performed, one of which on the drive side wall 33 and one is arranged on the operating side wall 40. As Thermal sensors come in advantageous resistance thermometers for use, whereby platinum (Pt 100) is particularly suitable, because its resistance is proportional to the temperature changes.

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 the drive side wall 33 and the To keep the operating side wall 40 at the same temperature. Normally, the drive side wall 33 due to the frictional losses of the gearbox of the Gear box 32 a higher temperature than that Operator side wall 40 on. The consequence is not one constant temperature curve over the length of the in the Side walls 33, 40 mounted cylinders. They are accordingly Temperature conditions of the stored cylinders over their length not can be optimally determined. The controller 37 is set so that at compared to the operating side wall 40 of higher temperature Drive side wall 33 opens the control valve 36 and thus with corresponding throughput of coolant through the heat exchanger 34 the lubricant of the gear box 32 cools. This in turn cools the drive side wall 33 on its circulation Temperature of the operator side wall 40 from. With the temperature equality the temperature constancy of both side walls Printing unit cylinders given over their length and a requirement created for good print quality across the entire print width.

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 of one or more cooling stations with coolant be supplied. The printing units can also be costly separately be equipped with control loops. Conversely, under Cost savings are already good results if more Printing units to the control devices of the printing unit 1 be connected. Can also with the blowing devices Coolant supply and the blower output are regulated. As Coolant is advantageously water.

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 in the preparation phase are used for printing to preheat the printing units, by first using a suitably heated coolant is fed. This will cause the paint to pick Start of printing with accompanying accumulation of paper particles in the Avoiding inking, which is very important since the waterless Offset printing the dampening system is missing, which otherwise particles from the Could discharge printing unit. The cooling station is then regulated that the coolant temperature gradually drops in continuous printing. For the purpose of Printer preheating uses the printer described and the cooling circuits shown in Figures 1 and 2 and provides a higher one at the thermostat of the cooling station, not shown Temperature value of the coolant temperature, advantageously the Operating temperature of the ink rubbing cylinder. In printing mode then poses the printer gradually lowers the coolant temperature corresponding to the higher cooling requirement due to self-heating of the printing unit, whose temperature can be read on a thermometer is. The temperature curve of the coolant for preheating can even after a temperature entered in a storage unit - Time curve or using a temperature sensor, for example a color friction cylinder, in connection with a controller become. It can e.g. B. the thermal sensor 29 on the ink cylinder 10 be used. The storage unit can be in the control device 42 can be accommodated.

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 + 0-Druck entsteht.A web can also be printed using the so-called di-litho process become. A relevant course of the path is dashed in Fig. 1 located. The web 70 is between the transfer cylinder 4th and passed through the Formzyliner 6 and thereby from the latter printed. In the subsequent passage of the web 70 between the Transfer cylinder 4 and the transfer cylinder 3 is on the printed web side printed a second color so that a 2 + 0 pressure arises.

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 be used instead of a transfer cylinder further printing unit also with an actual impression cylinder work together. 5 shows such a three-cylinder printing unit. It contains a forme cylinder 71, a transfer cylinder 72 and an impression cylinder 73. The forme cylinder 71 is a Short inking unit, namely an anilox inking unit, colored. This contains an anilox roller 75 colored by a chambered doctor blade 74 and an applicator roller 76. The anilox roller 75 colors the Application roller 76, which in turn is the printing form of the forme cylinder 71st Inking. The latter transfers the print image to the Transfer cylinder 72 that prints on 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.Also advantageous for printing units for waterless offset printing Ionizing bars to remove electrostatic charges for Application. In the exemplary embodiment according to FIG. 1, ionizing rods 79, 80 on both sides of the web 21 after their passage between them printing transfer cylinders 3, 4 arranged. Ionizing bars can also be placed before or before and after the track 21 printing cylinders can be arranged. The waterless one Offset printing drier web tends to be more electrostatic Charging with a correspondingly strong attraction of dust particles from the area. 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, also the color mist. Furthermore, sensitive electronic Protected components that are exposed to high electrical fields can be damaged or destroyed. Finally, with the dismantling of the electrostatic charge releasing the web from them printed cylinders, which opens the possibility with print less web tension and thus lighter papers to be able to process with 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 is not only on roles but also on Sheet-fed rotary printing presses can be used, for example in one 5 designed printing unit.

Claims (2)

  1. Forme or transfer cylinder (43) of a printing unit (1, 2) for waterless offset printing, which is mounted in side walls (46, 47) and carries a sleeve (67), wherein one end of the forme or transfer cylinder (43) can be exposed from one side wall (46), producing an aperture via which the sleeve (67) can be pushed onto the forme or transfer cylinder (43), in the case of the other side wall (47), beside which the drive (59) is disposed, a line (52) for a coolant in the forme or transfer cylinder (43) is connected to an outside line (65) and extends through the forme or transfer cylinder (43) to the other end of the forme or transfer cylinder (43), and at this end is in connection by means of a radial access (55) to a cooling chamber (53) through which the coolant flows, cooling the surface (50) of the forme or transfer cylinder (43), and which is connected to a discharge line (66) by means of a channel (57) leading through the drive-side journal (45) out of the forme or transfer cylinder (43), and at the end of the forme or transfer cylinder (43) associated with the other side wall (47) compressed air is conveyed via a connection. (60) through the forme or transfer cylinder (43) via a line (54) to radial bores (64) disposed at the other end of the cylinder beside the side wall (46), by means of which bores the compressed air flows out to expand the sleeve (67) to be pushed on.
  2. Forme or transfer cylinder (43) according to claim 1, characterised in that the cooling chamber (53) has spiral guide vanes determining the circulation of the coolant.
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
DE4431188 1994-09-01
DE4431188A DE4431188C2 (en) 1993-11-05 1994-09-01 Printing unit for waterless offset printing

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US5784957A (en) 1998-07-28
US5595115A (en) 1997-01-21
JP2877705B2 (en) 1999-03-31
EP0652104A1 (en) 1995-05-10

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