EP1149696B1 - Offset printing unit for a printing machine - Google Patents
Offset printing unit for a printing machine Download PDFInfo
- Publication number
- EP1149696B1 EP1149696B1 EP01108985A EP01108985A EP1149696B1 EP 1149696 B1 EP1149696 B1 EP 1149696B1 EP 01108985 A EP01108985 A EP 01108985A EP 01108985 A EP01108985 A EP 01108985A EP 1149696 B1 EP1149696 B1 EP 1149696B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- application roller
- plate cylinder
- roller
- offset printing
- plating
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/20—Details
- B41F7/24—Damping devices
- B41F7/26—Damping devices using transfer rollers
Definitions
- the invention relates to an offset printing unit for a printing press, which has a plate cylinder carrying a printing plate, which is operatively connected at least with inking rollers of an inking unit which can be turned on and off, according to the preamble of the independent claims.
- An offset printing unit of this kind is from the DE 34 16 845 A1 known with an inking unit and a dampening unit.
- the dampening unit consists essentially of a feeder for the dampening solution with a device for metering the dampening solution film and an applicator roller which transmits the dampening solution film to a plate cylinder and coupled to the adjacent inking unit or can also be operated separately.
- the dampening roller can have a different peripheral speed to the plate cylinder, so that, for example, foreign particles eliminating wiping effect arises.
- a disadvantage of these embodiments is that the ink accumulating on the dampening roller is fed into the dampening unit and thus the color / dampening solution balance is impaired. These impairments show up in the form of stenciling or kordst Shape (streaks).
- Out DE 4404898 A1 is an offset printing unit known, which is universally operable in offset printing.
- the offset printing unit is switchable from the wet offset mode to the dry offset mode in that the dampening form roller in contact with the ink-carrying plate cylinder is decoupled from a dampening solution supply at a separation point and drivable at a differential speed to the peripheral speed of the plate cylinder.
- the disadvantage here is that in the contact zone with the plate cylinder, a demolition of color or a color split occurs and that thereby an uneven color guide and a deterioration of the print quality occurs.
- DE 4423286 A1 is a printing unit for a rotary offset printing machine with a plate cylinder, which carries a suitable for the dampening-free offset printing plate known.
- the inking unit in this case is associated with the removal of impurities, an additional roller which is independent of the ink rollers to the pressure plate in a first operating position and against the direction of rotation of the plate cylinder with a peripheral speed of the plate cylinder deviating peripheral speed can be driven. In a second operating position, the additional roller - starting from the first operating position - integrated into the inking unit.
- DE 38 43 473 A1 discloses a dampening unit for offset printing machines, which comprises a tray for the dampening solution, a scoop roller immersed therein and a dampening form roller operatively connected to the scoop roller.
- the dampening roller is in contact with a plate cylinder brought.
- a Abstreifmesser is adjustable, which strips the dampening solution on the surface of the dampening roller, so that the stripped dampening solution can drain back via the scoop roller back into the tub.
- the invention is based on the object to provide an offset printing unit of the type described above, which avoids the disadvantages mentioned, which supports in particular a process-stable ink guide on a plate cylinder and improves the print quality noticeably.
- a first advantage of the invention is that an application roller arranged in the direction of rotation of the plate cylinder in front of an inking unit can be used in wet offset mode with a dampening solution feed or in dry offset operation with a damp-free offset printing with interrupted or switched off or without dampening solution supply and noticeably improves the print quality in all modes of operation is. It has been found that there is no uniform color distribution over the roll width on the outer surface of such an applicator roll in the direction of rotation after tear-off of color or a color split, in particular during thread-like tearing off, in a contact zone of applicator roll and ink-carrying plate cylinder.
- dampening solution can also be conducted by the application roller in addition to the ink.
- this uneven Surface topography after such a contact zone is at least before a new demolition of color or a color splitting in a further contact zone by means of at least one parallel on and preferably abtool arranged plating is leveled.
- a further advantage is that, in addition to the surface topography leveled on the jacket surface of the applicator roll, the color structure constructed on the applicator roll, which is built on the applicator roll, can be leveled by means of at least one plating device.
- the leveling of the color structure and the leveled surface topography in wet offset operation stabilize the dampening solution supply to the applicator roll and the applicator roll to the plate cylinder, reduce the risk of emulsification in the inking unit, which process-stable color guide is supported on the plate cylinder or in the inking, and noticeably improve the print quality the substrate.
- the equalized color structure and the leveled surface topography reduce the possibility of picking up possible dirt, for example slugs, which supports process-stable color guidance on the plate cylinder or in the inking unit, and the print quality is noticeably improved.
- the arrangement of at least one plating device on the lateral surface of the applicator roller reduces the stencil inclination (shadow-like markings) during printing as well as the cord strip causing an uneven pressure. It has been found that in wet offset printing with the application roller and at least one associated plating device, the dampening solution supply from the dampening ductor to the application roller can be reduced and also the use of alcohol can be reduced. It is also advantageous that the application roller to the plate cylinder with either the same or unequal peripheral speed is driven and that the plating device causes a change in shape of the color tips, color dome and color valleys after a demolition or a color split towards a flat surface topography.
- a plate cylinder 1 carries a printing plate and is according to Fig. 1 with a blanket cylinder 2, a dampening unit 3 and a downstream inking unit 4 in functional connection.
- the inking unit 4 consists of several on and off arranged inking rollers 5, which are connected to the ink-feeding rollers (not shown).
- the dampening unit 3 is - viewed in the direction of rotation of the plate cylinder 1 - upstream of the inking unit 4 and consists in the present example of a dampening solution tank 9, a dampening ductor 7, a metering roller 8 and an applicator roller 6.
- the applicator roller 6 is in a first contact zone 12 with the above the inking unit 4 dyeable plate cylinder 1 on and off in functional connection.
- At least the dampening solution container 9 and the dampening duct 7 form the dampening solution supply device which is in functional connection with the application roller 6 in a second contact zone 16.
- At least one plating device 11 can be set parallel to the outer surface of the applicator roller 6, and preferably can be disposed of. In this case, the applicator roller 6 can be driven either with a circumferential speed of the plate cylinder 1 same or different peripheral speed. In the wet offset mode, at least one plating device 11 is preferred in the direction of rotation of the applicator roller 6 in front of the in the second contact zone 16 with the applicator roller 6 in operative connection dampening solution supply 7 -. 9 arranged. In a further development, in the direction of rotation of the applicator roller 6 after the second contact zone 16 and before the first contact zone 12, a further (identical) plating 11 to the outer surface of the applicator roller 6 on and off arranged.
- the applicator roller 6 In the dry offset is in the direction of rotation of the applicator roller 6 after the first contact zone 12 with the plate cylinder 1 at least one plating 11 and ab suit arranged on the lateral surface of the applicator roller 6 and the applicator roller 6 is either with the peripheral speed of the plate cylinder 1 same or different peripheral speed drivable and employed in the first contact zone 12 to the plate cylinder 1 with the dampening solution supply 7-9 switched off.
- the offset printing unit has no dampening unit.
- the applicator roller 6 In the direction of rotation of the applicator roller 6, after the first contact zone 12 with the plate cylinder 1, at least one plating device 11 is arranged on and off the lateral surface of the applicator roller 6.
- the applicator roller 6 is selectively driven with a peripheral speed of the plate cylinder 1 same or different peripheral speed, wherein the applicator roller 6 in the direction of rotation of the plate cylinder 1 the inking rollers 5 of the inking unit 4 is arranged upstream.
- the plate cylinder 1 In dry offset operating modes, the plate cylinder 1 carries a printing plate suitable for damp-free offset printing.
- the application roller 6 is independent of the inking rollers 5 to the ink-carrying printing plate or the plate cylinder 1 in the first contact zone 12 on and off arranged.
- the applicator roller 6 is in the direction of rotation after first contact zone 12, in which a tearing off of color or a color splitting takes place, at least one plating device 11 on and preferably arranged ab aus the lateral surface of the applicator roll 6.
- the applicator roller 6 is optionally with the same or unequal peripheral speed - based on the peripheral speed of the plate cylinder 1 - rotatably driven, for example via a reversible positive drive.
- At least one plating device 11 is coupled to an axially acting traction drive, regardless of the particular operating mode.
- all plating devices 11 are coupled with such a traversing drive.
- the traversing drive is on the drive side preferably geared to the drivable plate cylinder 1 in functional connection.
- at least the plating device 11 arranged in front of the contact zone 16 can be driven in an oscillatable manner.
- the applicator roller 6 can be driven either with a circumferential speed of the plate cylinder 1 same or unequal peripheral speed.
- the application roller 6 on the drive side is preferably geared to the drivable plate cylinder 1 in functional connection.
- the plating 11 are preferred in the direction of rotation of the applicator roller 6 in her Direction tangent or secant to the outer surface of the applicator roll 6 on and off arranged.
- Each plating device 11 is preferably by means of a force F, for example by a compression spring applied, on the lateral surface of the applicator roll 6 adjustable. Furthermore, by means of each plating device 11, a uniform surface pressure across the width of the applicator roller 6 or the uneven surface topography of the ink can be applied.
- the plating device 11 is adjustable in its inclination angle to the lateral surface of the applicator roller 6.
- At least one plating device 11 consists of a plating element 13, which extends over the width of the applicator roller 6 and is detachably arranged in a holder 14.
- the holder 14 is preferably arranged on the frame side in a double-sided storage 15.
- at least one plating device 11 is arranged in the direction of rotation of the applicator roller 6, for example in each case in a swivel joint, in a bearing 15 on both sides.
- the bearing 15 is movable such that the plating element 11 in its inclination angle ( Fig. 6.7 Double arrow) to the applicator roller 6 is arranged adjustable.
- the free end of the plating element 13 is arranged tangentially or secantily on the lateral surface of the applicator roller 6, preferably in a tangent or secant point, ending.
- the free end of the preferably adjustable plating element 13 ends at a slight distance from the lateral surface of the applicator roller 6. The distance is such that a leveling of an uneven surface topography 19 can be realized.
- the plate cylinder 1 In a dry offset operating mode, the plate cylinder 1 carries a printing plate suitable for damp-free offset printing.
- the application roller 6 is in this case in the direction of rotation of the plate cylinder 1 before Ink application rollers 5 arranged. Furthermore, the applicator roller 6 is independent of the inking rollers 5 on the ink-carrying printing plate or the plate cylinder 1 in the first contact zone 12 on and off arranged.
- the applicator roller 6 is in the direction of rotation after the first contact zone 12, in which a tearing off of color or a color splitting takes place, at least one plating 11 and preferably arranged ab to the lateral surface of the applicator roller 6.
- the applicator roller 6 is optionally with the same or unequal peripheral speed - based on the peripheral speed of the plate cylinder 1 - rotatably driven, for example via a reversible positive drive.
- the applicator roller 6 with at least one plating device 11 to the inking rollers 5 of the inking unit 4 is arranged separately, in the direction of rotation of the plate cylinder 1, before the inking unit 4 and forms the first contact zone 12 with the plate cylinder 1.
- Fig. 4 a development is shown, such that the applicator roller 6 with at least one plating 11, in the direction of rotation of the plate cylinder 1, is arranged in front of the inking unit 4 and forms the contact zone 12 with the plate cylinder 1.
- the applicator roller 6 is associated with a bridge roller 17 in contact, which is simultaneously in contact with the first in the direction of rotation of the plate cylinder 1 inking roller 5 of the inking unit 4.
- the applicator roller 6 can be used as an additional inking roller. In the direction of rotation of the applicator roller 6 at least one plating 11 after the first contact zone 12 and / or after the contact zone of bridge roller 17 and applicator roller 6 on the outer surface of the applicator roller 6 on / off.
- the applicator roller 6 in the first Contact zone 12 with the plate cylinder 1 in contact is associated with a bridge roller 18 in contact, which is optionally separately with the applicator roller 6 or in the direction of rotation of the plate cylinder 1 first inking roller 5 of the inking unit 4 and the applicator roller 6 in contact.
- the direction of rotation of the applicator roller 6 is at least one plating 11 after the first contact zone 12 and / or after the contact zone of bridge roller 18 and applicator roller 6 to the outer surface of the applicator roller 6 on / off.
- the application roller 6 is shown with at least one plating device 11, wherein the plating device 11 in Fig. 6 is formed by an extending over the roll width plating element 13 with holder 14 and bearing 15.
- another plating device 11 extending across the roll width is shown which has doubly arranged plating elements 13.
- the plating elements 13 overlap in a defined area and are preferably accommodated in a common holder 14 and a bearing 15.
- the free ends of the plating elements 13 end tangent- or secant-shaped at different points on the lateral surface of the applicator roller 6.
- plating element 13 With the first in the direction of rotation of the applicator roller 6 plating element 13 a first leveling and with the downstream second plating element 13 a second leveling of the residual color (with or without fountain solution) on the applicator roll 6 achievable. Also in this embodiment, the plating device 11 is arranged adjustable in its inclination angle.
- Each plating device 11 is preferably loaded in the direction of rotation of the applicator roller 6 after the contact point 12 to improve the cohesion of the ink with a uniform surface pressure and the outer surface of the applicator roller 6 assigned.
- the application roller 6 can always be driven either with a circumferential speed of the plate cylinder 1 same or different peripheral speed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Rotary Presses (AREA)
Abstract
Description
Die Erfindung betrifft ein Offsetdruckwerk für eine Druckmaschine, das einen eine Druckform tragenden Plattenzylinder, der zumindest mit an- und abstellbaren Farbauftragwalzen eines Farbwerkes in Funktionsverbindung ist, aufweist, nach dem Oberbegriff der unabhängigen Ansprüche.The invention relates to an offset printing unit for a printing press, which has a plate cylinder carrying a printing plate, which is operatively connected at least with inking rollers of an inking unit which can be turned on and off, according to the preamble of the independent claims.
Ein Offsetdruckwerk dieser Art ist aus der
Aus der
Nachteilig bei diesen Ausführungen ist es, dass die auf der Feuchtauftragwalze sich ansammelnde Farbe in das Feuchtwerk geführt wird und damit das Farb-/Feuchtmittelgleichgewicht beeinträchtigt wird. Diese Beeinträchtigungen zeigen sich in Form von Schablonieren oder Kordstreifen (Schlieren).A disadvantage of these embodiments is that the ink accumulating on the dampening roller is fed into the dampening unit and thus the color / dampening solution balance is impaired. These impairments show up in the form of stenciling or kordstreifen (streaks).
Aus
Gemäß
Der Erfindung liegt die Aufgabe zu Grunde, ein Offsetdruckwerk der eingangs beschriebenen Art zu schaffen, das die genannten Nachteile vermeidet, das insbesondere eine prozessstabile Farbführung auf einem Plattenzylinder unterstützt und die Druckqualität spürbar verbessert .The invention is based on the object to provide an offset printing unit of the type described above, which avoids the disadvantages mentioned, which supports in particular a process-stable ink guide on a plate cylinder and improves the print quality noticeably.
Gelöst wird dies erfingdungsgemäß durch die Ausbildungsmerkmale der unabhängigen Ansprüche 1 und 3. Weiterbildungen ergeben sich aus den abhängigen Ansprüchen.This is achieved according to the invention by the training features of
Ein erster Vorteil der Erfindung besteht darin, dass eine in Drehrichtung des Plattenzylinders vor einem Farbwerk angeordnete Auftragwalze im Nassoffsetbetrieb mit einer Feuchtmittelzuführung oder im Trockenoffsetbetrieb bei einem feuchtmittelfreien Offsetdruck mit unterbrochener bzw. abgeschalteter oder ohne eine Feuchtmittelzuführung einsetzbar ist und in allen Betriebsweisen die Druckqualität spürbar verbessert ist.
Es wurde gefunden, dass auf der Mantelfläche einer derartigen Auftragwalze in Drehrichtung nach einem Abreißen von Farbe bzw. einer Farbspaltung, insbesondere beim fadenförmigen Abreißen, in einer Kontaktzone von Auftragwalze und farbführendem Plattenzylinder, keine gleichmäßige Farbverteilung - über die Walzenbreite betrachtet - vorliegt. Es liegt auf der Auftragwalze eine unebene Oberflächentopographie der Farbe vor, welche durch vom eingefärbten Plattenzylinder zurückgespaltete Restfarbe in Form von Farbspitzen bzw. Farbkuppen und Farbtälern auf der Mantelfläche der Auftragwalze charakterisiert ist. Dabei kann je nach o.g. Betriebsart neben der Farbe auch Feuchtmittel von der Auftragwalze geführt werden.A first advantage of the invention is that an application roller arranged in the direction of rotation of the plate cylinder in front of an inking unit can be used in wet offset mode with a dampening solution feed or in dry offset operation with a damp-free offset printing with interrupted or switched off or without dampening solution supply and noticeably improves the print quality in all modes of operation is.
It has been found that there is no uniform color distribution over the roll width on the outer surface of such an applicator roll in the direction of rotation after tear-off of color or a color split, in particular during thread-like tearing off, in a contact zone of applicator roll and ink-carrying plate cylinder. There is on the applicator roller before an uneven surface topography of the color, which is characterized by back-stained by the colored plate cylinder residual color in the form of color peaks or Farbkuppen and Farbtälern on the lateral surface of the applicator roll. Depending on the above-mentioned mode of operation, dampening solution can also be conducted by the application roller in addition to the ink.
Weiterhin ist - resultierend aus einem vorangegangenen Abriss von Farbe bzw. einer Farbspaltung in einer durch eine Auftragwalze und einen farbführenden Plattenzylinder (mit Druckform) gebildeten Kontaktzone - eine unebene Oberflächentopographie auf der Mantelfläche der Auftragwalze vorhanden, welche auch abhängig vom jeweiligen Drucksujet ist.Furthermore, as a result of a preceding tear of ink or a color split in a contact zone formed by an applicator roll and a color-guiding plate cylinder (with printing form), there is an uneven surface topography on the surface of the applicator roll, which is also dependent on the respective printing subject.
Vorteilhaft ist, dass in Drehrichtung der Auftragwalze diese unebene Oberflächentopographie nach einer derartigen Kontaktzone wenigstens vor einem erneuten Abriss von Farbe bzw. einer Farbspaltung in einer weiteren Kontaktzone mittels wenigstens einer parallel an- und bevorzugt abstellbar angeordneten Plattiereinrichtung eingeebnet ist.It is advantageous that in the direction of rotation of the applicator roll this uneven Surface topography after such a contact zone is at least before a new demolition of color or a color splitting in a further contact zone by means of at least one parallel on and preferably abgestellt arranged plating is leveled.
Ein weiterer Vorteil besteht darin, dass neben der auf der Mantelfläche der Auftragwalze eingeebneten Oberflächentopographie mittels wenigstens einer Plattiereinrichtung die sujetbedingt aufgebaute Farbstruktur auf der Auftragwalze egalisierbar ist. Die Egalisierung der Farbstruktur und die eingeebnete Oberflächentopographie stabilisieren im Nassoffsetbetrieb die Feuchtmittelzuführung zur Auftragwalze und von der Auftragwalze zum Plattenzylinder, reduzieren die Gefahr des Emulgierens im Farbwerk,wodurch die prozessstabile Farbführung auf dem Plattenzylinder bzw. im Farbwerk unterstützt wird, und verbessern spürbar die Druckqualität auf dem Bedruckstoff. Im Trockenoffsetbetrieb wird durch die egalisierte Farbstruktur und die eingeebnete Oberflächentopographie die Aufnahme möglicher Verschmutzungen, beispielsweise Butzen, reduziert , wodurch die prozessstabile Farbführung auf dem Plattenzylinder bzw. im Farbwerk unterstützt wird, und die Druckqualität wird spürbar verbessert.A further advantage is that, in addition to the surface topography leveled on the jacket surface of the applicator roll, the color structure constructed on the applicator roll, which is built on the applicator roll, can be leveled by means of at least one plating device. The leveling of the color structure and the leveled surface topography in wet offset operation stabilize the dampening solution supply to the applicator roll and the applicator roll to the plate cylinder, reduce the risk of emulsification in the inking unit, which process-stable color guide is supported on the plate cylinder or in the inking, and noticeably improve the print quality the substrate. In dry offset operation, the equalized color structure and the leveled surface topography reduce the possibility of picking up possible dirt, for example slugs, which supports process-stable color guidance on the plate cylinder or in the inking unit, and the print quality is noticeably improved.
Vorteilhaft ist ebenso, dass die Anordnung von wenigstens einer Plattiereinrichtung an der Mantelfläche der Auftragwalze die Schablonierneigung (schattenartige Markierungen) beim Druck sowie die einen ungleichmäßigen Druck bewirkenden Kordstreifen verringert.
Es wurde gefunden, dass beim Nassoffsetdruck mit der Auftragwalze und wenigstens einer zugeordneten Plattiereinrichtung die Feuchtmittelzufuhr vom Feuchtduktor her zur Auftragwalze verringert werden kann und auch der Einsatz von Alkohol reduziert werden kann.
Es ist weiterhin vorteilhaft, dass die Auftragwalze zum Plattenzylinder mit wahlweise gleicher oder ungleicher Umfangsgeschwindigkeit antreibbar ist und dass die Plattiereinrichtung eine Formänderung der Farbspitzen, Farbkuppen und Farbtäler nach einem Abriss bzw. einer Farbspaltung hin zu einer ebenen Oberflächentopographie bewirkt. Bei einer derartigen Formänderung (plastischen Formänderung) der Farbe von einer unebenen Oberflächentopographie hin zu einer ebenen Oberflächentopographie auf der Mantelfläche der Auftragwalze gleiten die Farbspitzen, Farbkuppen in die Farbtäler. Es erfolgen somit innerhalb der Farbschicht des Farbgefüges auf der Auftragwalze Abgleitvorgänge, die die plastische Formgebung - ohne Abscherwirkung der Farbe - bewirken, so dass eine ebene Oberflächentopographie in einer definierten Schichtdicke erzielbar ist.It is also advantageous that the arrangement of at least one plating device on the lateral surface of the applicator roller reduces the stencil inclination (shadow-like markings) during printing as well as the cord strip causing an uneven pressure.
It has been found that in wet offset printing with the application roller and at least one associated plating device, the dampening solution supply from the dampening ductor to the application roller can be reduced and also the use of alcohol can be reduced.
It is also advantageous that the application roller to the plate cylinder with either the same or unequal peripheral speed is driven and that the plating device causes a change in shape of the color tips, color dome and color valleys after a demolition or a color split towards a flat surface topography. In such a change in shape (plastic deformation) of the color of an uneven surface topography towards a flat surface topography on the outer surface of the applicator roll slide the color tips, color dome in the color valleys. There are thus carried out within the color layer of the color structure on the applicator roller Abgleitvorgänge that cause the plastic shaping - without Abscherwirkung the color - so that a flat surface topography in a defined layer thickness can be achieved.
Die Erfindung soll an einem Ausführungsbeispiel näher erläutert werden. Dabei zeigen:
- Fig. 1
- ein Offsetdruckwerk mit einem Farbwerk und einem Feuchtwerk (Nassoffsetbetrieb),
- Fig. 2
- ein erstes Offsetdruckwerk für den Trockenoffsetbetrieb,
- Fig. 3
- ein zweites Offsetdruckwerk für den Trockenoffsetbetrieb,
- Fig. 4
- eine Weiterbildung der
undFiguren 23 , - Fig. 5
- eine Weiterbildung von
,Figur 1 - Fig. 6
- eine Auftragwalze mit einer Plattiereinrichtung mit einem
Plattierelement, - Fig. 7
- eine Auftragwalze mit einer Plattiereinrichtung mit doppelt angeordneten Plattierelementen.
- Fig. 1
- an offset printing unit with an inking unit and a dampening unit (wet offset mode),
- Fig. 2
- a first offset printing unit for dry offset operation,
- Fig. 3
- a second offset printing unit for dry offset operation,
- Fig. 4
- a further education
Figures 2 and3 . - Fig. 5
- a further education of
FIG. 1 . - Fig. 6
- an applicator roll with a plating with a
plating member, - Fig. 7
- an applicator roll with a plating device with double plating elements.
Ein Plattenzylinder 1 trägt eine Druckform und ist gemäß
In Drehrichtung der Auftragwalze 6 ist nach der ersten Kontaktzone 12 wenigstens eine Plattiereinrichtung 11 an die Mantelfläche der Auftragwalze 6 parallel anstellbar, und bevorzugt abstellbar, angeordnet. Dabei ist die Auftragwalze 6 wahlweise mit einer zur Umfangsgeschwindigkeit des Plattenzylinders 1 gleichen oder abweichenden Umfangsgeschwindigkeit antreibbbar.
Bevorzugt ist im Nassoffsetbetrieb wenigstens eine Plattiereinrichtung 11 in Drehrichtung der Auftragwalze 6 vor der in der zweiten Kontaktzone 16 mit der Auftragwalze 6 in Funktionsverbindung stehenden Feuchtmittelzuführung 7 - 9 angeordnet.
In einer Weiterbildung ist in Drehrichtung der Auftragwalze 6 nach der zweiten Kontaktzone 16 und vor der ersten Kontaktzone 12 eine weitere (baugleiche) Plattiereinrichtung 11 an die Mantelfläche der Auftragwalze 6 an- und abstellbar angeordnet.In the direction of rotation of the
In the wet offset mode, at least one
In a further development, in the direction of rotation of the
Im Trockenoffset ist in Drehrichtung der Auftragwalze 6 nach der ersten Kontaktzone 12 mit dem Plattenzylinder 1 zumindest eine Plattiereinrichtung 11 an- und abstellbar an die Mantelfläche der Auftragwalze 6 angeordnet und die Auftragwalze 6 ist wahlweise mit einer zur Umfangsgeschwindigkeit des Plattenzylinders 1 gleichen oder abweichenden Umfangsgeschwindigkeit antreibbar und bei abgeschalteter Feuchtmittelzuführung 7- 9 in der ersten Kontaktzone 12 an den Plattenzylinder 1 angestellt.In the dry offset is in the direction of rotation of the
In einer weiteren Betriebsweise für den Trockenoffset weist das Offsetdruckwerk kein Feuchtwerk auf. In Drehrichtung der Auftragwalze 6 ist nach der ersten Kontaktzone 12 mit dem Plattenzylinder 1 zumindest eine Plattiereinrichtung 11 an- und abstellbar an die Mantelfläche der Auftragwalze 6 angeordnet. Dabei ist die Auftragwalze 6 wahlweise mit einer zur Umfangsgeschwindigkeit des Plattenzylinders 1 gleichen oder abweichenden Umfangsgeschwindigkeit antreibbar ist, wobei die Auftragwalze 6 in Drehrichtung des Plattenzylinders 1 den Farbauftragwalzen 5 des Farbwerkes 4 vorgeordnet ist.In another mode of operation for dry offset, the offset printing unit has no dampening unit. In the direction of rotation of the
In den Betriebsarten für den Trockenoffset trägt der Plattenzylinder 1 eine für den feuchtmittelfreien Offsetdruck geeignete Druckform. Dem Plattenzylinder 1 sind wiederum die Farbauftragwalzen 5 des Farbwerkes 4 zugeordnet, welche die Druckform mit einer für den Trockenoffset geeigneten Druckfarbe einfärben. Die Auftragwalze 6 ist unabhängig von den Farbauftragwalzen 5 an die farbführende Druckform bzw. den Plattenzylinder 1 in der ersten Kontaktzone 12 an- und abstellbar angeordnet. Der Auftragwalze 6 ist in Drehrichtung nach der ersten Kontaktzone 12, in der ein Abreißen von Farbe bzw. eine Farbspaltung erfolgt, zumindest eine Plattiereinrichtung 11 an- und bevorzugt abstellbar zur Mantelfläche der Auftragwalze 6 angeordnet. Die Auftragwalze 6 ist dabei wahlweise mit gleicher oder ungleicher Umfangsgeschwindigkeit - bezogen auf die Umfangsgeschwindigkeit des Plattenzylinders 1 - rotativ antreibbar, beispielsweise über einen umschaltbaren Zwangsantrieb.In dry offset operating modes, the
Ist der Auftragwalze 6 eine Feuchtmittelzuführung 7 -9 vorgeschaltet, so ist diese in einer Trennstelle 10 unterbrochen.If the
In einer bevorzugten Weiterbildung ist unabhängig von der jeweiligen Betriebsart wenigstens eine Plattiereinrichtung 11 mit einem axial wirkenden Changierantrieb gekoppelt. Alternativ sind sämtliche Plattiereinrichtungen 11 mit einem derartigen Changierantrieb gekoppelt. Der Changierantrieb ist antriebsseitig bevorzugt getriebetechnisch mit dem antreibbaren Plattenzylinder 1 in Funktionsverbindung.
In der Betreibweise für den Nass-Offset ist zumindest die vor der Kontaktzone 16 angeordnete Plattiereinrichtung 11 changierbar antreibbar.In a preferred embodiment, at least one
In the operating mode for the wet offset, at least the
Im Druckbetrieb ist die Auftragwalze 6 wahlweise mit einer zur Umfangsgeschwindigkeit des Plattenzylinders 1 gleichen oder ungleichen Umfangsgeschwindigkeit antreibbar. Dazu ist die Auftragwalze 6 antriebsseitig bevorzugt getriebetechnisch mit dem antreibbaren Plattenzylinder 1 in Funktionsverbindung.In the printing operation, the
Die Plattiereinrichtungen 11 sind in Drehrichtung der Auftragwalze 6 bevorzugt in ihrer
Richtung tangentenförmig oder sekantenförmig an die Mantelfläche der Auftragwalze 6 an- und abstellbar angeordnet. Bevorzugt ist dabei jede Plattiereinrichtung 11 mittels einer Kraft F, beispielsweise von einer Druckfeder aufgebracht, an die Mantelfläche der Auftragwalze 6 anstellbar. Weiterhin bevorzugt ist mittels jeder Plattiereinrichtung 11 eine gleichmäßige Flächenpressung über die Breite der Auftragwalze 6 bzw. die unebene Oberflächentopographie der Farbe aufbringbar.The
Direction tangent or secant to the outer surface of the
In einer bevorzugten Ausbildung ist die Plattiereinrichtung 11 in ihrem Neigungswinkel zur Mantelfläche der Auftragwalze 6 einstellbar.In a preferred embodiment, the
In einer weiteren Ausbildung besteht wenigstens eine Plattiereinrichtung 11 aus einem Plattierelement 13, welches sich über die Breite der Auftragwalze 6 erstreckt und in einer Halterung 14 lösbar angeordnet ist. Die Halterung 14 ist bevorzugt gestellseitig in einer beidseitigen Lagerung 15 angeordnet. Bevorzugt ist wenigstens eine Plattiereinrichtung 11 in Drehrichtung der Auftragwalze 6, beispielsweise in je einem Drehgelenk, in einer beidseitigen Lagerung 15 angeordnet. In einer bevorzugten Weiterbildung ist die Lagerung 15 derart bewegbar, dass das Plattierelement 11 in seinem Neigungswinkel (
In einer weiteren Ausbildung endet das freie Ende des bevorzugt einstellbaren Plattierelements 13 in einem geringfügigen Abstand zur Mantelfläche der Auftragwalze 6. Dabei ist der Abstand derart, dass ein Einebnen einer unebenen Oberflächentopographie 19 realisierbar ist.In a further embodiment, at least one
In a further embodiment, the free end of the preferably
In einer Betriebsart für den Trockenoffset trägt der Plattenzylinder 1 eine für den feuchtmittelfreien Offsetdruck geeignete Druckform. Dem Plattenzylinder 1 sind wiederum die Farbauftragwalzen 5 des Farbwerkes 4 zugeordnet, welche die Druckform mit einer für den Trockenoffset geeigneten Druckfarbe einfärben. Die Auftragwalze 6 ist hierbei in Drehrichtung des Plattenzylinders 1 vor den Farbauftragwalzen 5 angeordnet. Weiterhin ist die Auftragwalze 6 unabhängig von den Farbauftragwalzen 5 an die farbführende Druckform bzw. den Plattenzylinder 1 in der ersten Kontaktzone 12 an- und abstellbar angeordnet. Der Auftragwalze 6 ist in Drehrichtung nach der ersten Kontaktzone 12, in der ein Abreißen von Farbe bzw. eine Farbspaltung erfolgt, zumindest eine Plattiereinrichtung 11 an- und bevorzugt abstellbar zur Mantelfläche der Auftragwalze 6 angeordnet. Die Auftragwalze 6 ist dabei wahlweise mit gleicher oder ungleicher Umfangsgeschwindigkeit - bezogen auf die Umfangsgeschwindigkeit des Plattenzylinders 1 - rotativ antreibbar, beispielsweise über einen umschaltbaren Zwangsantrieb.In a dry offset operating mode, the
Ist der Auftragwalze 6 eine Feuchtmittelzuführung 7 -9 vorgeschaltet, so ist diese in einer Trennstelle 10 unterbrochen bzw. abgeschaltet.If the
In
In
In
In den
Jede Plattiereinrichtung 11 ist in Drehrichtung der Auftragwalze 6 nach der Kontaktstelle 12 zur Verbesserung der Kohäsion der Farbe bevorzugt mit einer gleichmäßigen Flächenpressung belastet und der Mantelfläche der Auftragwalze 6 zugeordnet.Each
Unabhängig von den Betriebsweisen Nass-Offset oder Trockenoffset ist die Auftragwalze 6 stets wahlweise mit einer zur Umfangsgeschwindigkeit des Plattenzylinders 1 gleichen oder abweichenden Umfangsgeschwindigkeit antreibbar.Regardless of the operating modes wet offset or dry offset, the
- 11
- Plattenzylinderplate cylinder
- 22
- GummituchzylinderBlanket cylinder
- 33
- Feuchtwerkdampening
- 44
- Farbwerkinking
- 55
- FarbauftragwalzeInking roller
- 66
- Auftragwalzeapplicator roll
- 77
- Feuchtduktordampening ductor
- 88th
- Dosierwalzemetering
- 99
- FeuchtmittelbehälterDampening solution container
- 1010
- Trennstelleseparation point
- 1111
- Plattiereinrichtungplating
- 1212
- 1. Kontaktzone1. contact zone
- 1313
- Plattierelementplating member
- 1414
- Halterungbracket
- 1515
- Lagerungstorage
- 1616
- 2. Kontaktzone2nd contact zone
- 1717
- Brückenwalze (Trockenoffset)Bridge roller (dry offset)
- 1818
- Brückenwalze (Nass-Offset)Bridge roller (wet offset)
- 1919
- unebene Oberflächentopographieuneven surface topography
- 2020
- ebene Oberflächentopographieeven surface topography
- FF
- Kraftforce
Claims (10)
- An offset printing system for a printing press, with a plate cylinder (1) carrying a printing form, which is functionally connected with a throw-on and throw-off ink application roller (5) of an inking system (4) and a damping system (3) with at least one damping means feeding device and an application roller forming a contact zone with the plate cylinder (1), characterized in that in direction of rotation of the application roller (6) following the first contact zone (12) with the plate cylinder (1) for the cohesive levelling of the residual ink split back from the plate cylinder (1) to the application roller (6) a plating device (11) that can be thrown on and off the cylindrical surface of the application roller (6) is arranged and in that the application roller (6) can be optionally driven with a circumferential speed that is equal to or deviating from the circumferential speed of the plate cylinder (1).
- The offset printing system according to Claim 1, characterized in that the application roller (6) with switched-off damping means feed is thrown on to the plate cylinder (1) in the first contact zone (12).
- The offset printing system for a printing press, with a blade cylinder (1) carrying a printing form for offset printing free of damping means, which is functionally connected with throw-on and throw-off ink application rollers (5) of an inking system (4) and an application roller independent of the ink application rollers (5) forming a contact zone with the plate cylinder (1), characterized in that in direction of rotation of the application roller (6) after the first contact zone (12) with the plate cylinder (1) for the cohesive levelling of the residual ink split back from the plate cylinder (1) to the application roller (6) at least one plating device (11) that can be thrown on and thrown off the cylindrical surface of the application roller (6) is arranged, and in that the application roller (6) can be optionally driven with a circumferential speed that is equal or deviating from the circumferential speed of the plate cylinder (1), the application roller (6) in direction of rotation of the plate cylinder (1) is arranged upstream of the ink application rollers (5).
- The offset printing system according to Claim 1 or 3, characterized in that the plating device (11) is coupled with an axially reciprocating oscillating drive.
- The offset printing system according to at least Claim 1 or 3, characterized in that the plating device (11) in direction of rotation of the application roller (6) is arranged so that it can be thrown to the cylindrical surface of the application roller (6) tangentially or secant-like in its direction.
- The offset printing system according to at least Claim 1 or 3, characterized in that the plating device (11) is adjustable in its inclination angle to the cylindrical surface of the application roller (6).
- The offset printing system according to at least Claim 1 or 3, characterized in that by means of the plating device (11) an even surface pressure can be applied over the axial width of the application roller (6).
- The offset printing system according to at least Claim 1 or 3, characterized in that the plating device (11) in direction of rotation of the application roller (6) comprises a plating element (13) which extends over the entire roller width and is releasably arranged in a holding device (14).
- The offset printing system according to at least Claim 1 or 3 and 8, characterized in that the holding device (14) is arranged in a mounting (15) on both sides.
- The offset printing system according to at least Claim 1 or 3 and 8, characterized in that a free end of the plating element (13) terminates tangentially or secant-like on the cylindrical surface of the application roller (6).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10020227 | 2000-04-26 | ||
DE10020227A DE10020227B4 (en) | 2000-04-26 | 2000-04-26 | Offset printing unit for a printing machine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1149696A2 EP1149696A2 (en) | 2001-10-31 |
EP1149696A3 EP1149696A3 (en) | 2002-11-27 |
EP1149696B1 true EP1149696B1 (en) | 2010-08-04 |
Family
ID=7639872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01108985A Expired - Lifetime EP1149696B1 (en) | 2000-04-26 | 2001-04-11 | Offset printing unit for a printing machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1149696B1 (en) |
AT (1) | ATE476294T1 (en) |
DE (2) | DE10020227B4 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007001669C5 (en) * | 2007-01-11 | 2009-08-27 | Koenig & Bauer Aktiengesellschaft | Dampening unit for offset printing machine |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2948486C2 (en) * | 1979-12-01 | 1981-12-24 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Inking and dampening system for a rotary offset printing machine |
DE3308067C1 (en) * | 1983-03-08 | 1984-09-13 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Liquid supply device for ink and wet liquid of a rotary flat printing machine |
JPS59212268A (en) * | 1983-05-11 | 1984-12-01 | ボ−ルドウイン・テクノロジイ・コ−ポレイシヨン | Humidifier and method in lithographic press |
US4724764B1 (en) * | 1983-05-11 | 1994-09-20 | Baldwin Technology Corp | Dampening system |
GB2151186B (en) * | 1983-12-12 | 1987-09-09 | Baldwin Technology Corp | Dampening system |
DD274003A1 (en) * | 1988-07-11 | 1989-12-06 | Polygraph Leipzig | RAKE DEVICE FOR OFFSET PRINTING MACHINES |
DE3843473C2 (en) * | 1988-12-23 | 1996-02-22 | Kotterer Grafotec | Dampening system |
DE4404989C2 (en) * | 1994-02-17 | 1995-11-30 | Roland Man Druckmasch | Offset printing device |
DE4423286C2 (en) * | 1994-07-02 | 1998-06-04 | Heidelberger Druckmasch Ag | Printing unit for a rotary offset printing machine |
DE19529205C2 (en) * | 1995-08-09 | 1997-08-14 | Roland Man Druckmasch | Dampening unit for an offset printing machine |
DE19548287C2 (en) * | 1995-12-22 | 2000-01-13 | Heidelberger Druckmasch Ag | Printing unit for a rotary offset printing machine |
-
2000
- 2000-04-26 DE DE10020227A patent/DE10020227B4/en not_active Expired - Fee Related
-
2001
- 2001-04-11 AT AT01108985T patent/ATE476294T1/en active
- 2001-04-11 DE DE50115577T patent/DE50115577D1/en not_active Expired - Lifetime
- 2001-04-11 EP EP01108985A patent/EP1149696B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1149696A3 (en) | 2002-11-27 |
ATE476294T1 (en) | 2010-08-15 |
DE10020227A1 (en) | 2001-10-31 |
DE50115577D1 (en) | 2010-09-16 |
DE10020227B4 (en) | 2004-07-15 |
EP1149696A2 (en) | 2001-10-31 |
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