EP0324141A2 - Inking unit - Google Patents

Inking unit Download PDF

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Publication number
EP0324141A2
EP0324141A2 EP88121339A EP88121339A EP0324141A2 EP 0324141 A2 EP0324141 A2 EP 0324141A2 EP 88121339 A EP88121339 A EP 88121339A EP 88121339 A EP88121339 A EP 88121339A EP 0324141 A2 EP0324141 A2 EP 0324141A2
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EP
European Patent Office
Prior art keywords
doctor
inking unit
ink
doctor blade
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88121339A
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German (de)
French (fr)
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EP0324141A3 (en
EP0324141B1 (en
Inventor
Norbert Weisbrod
Norbert Köbler
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Albert Frankenthal AG
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Albert Frankenthal AG
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Publication date
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Publication of EP0324141A2 publication Critical patent/EP0324141A2/en
Publication of EP0324141A3 publication Critical patent/EP0324141A3/en
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Publication of EP0324141B1 publication Critical patent/EP0324141B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers

Definitions

  • the invention relates to an inking unit, in particular a short inking unit, for printing presses, in particular offset printing presses, with at least one anilox roller, which is assigned a chambered doctor blade arrangement with two doctor blades, which are preferably accommodated on a doctor blade holder and are offset with respect to one another in the circumferential direction of the anilox roller and which delimit an ink chamber which can be acted upon by ink. in which the anilox roller is immersed.
  • the roller arranged downstream of the anilox roller in short inking units this is already the applicator roller, and the peripheral section of the anilox roller that is running is not only no longer fully dyed, but usually contaminated with impurities in the form of dampening solutions and the like.
  • the doctor blade behind in the direction of rotation of the anilox roller which should strip these contaminants from the anilox roller and act as a front or closing doctor blade, wears out comparatively quickly, since the said contaminants, particularly in the form of the dampening solution, cause doctor blade wear to be extremely high favor.
  • this object is achieved in that the ink chamber is preceded by an inkable pre-chamber outside of the doctor blade, which acts as a front or closing squeegee and is upstream in the direction of rotation of the anilox roller, and into which the anilox roller is immersed.
  • the inking of the anilox roller in the area of the pre-chamber ensures that the entire length of the doctor blade, which is at risk of wear due to the contaminants to be wiped off, is applied over its entire length, which also ensures gentle operation in the event of an unfavorable angle of attack of this doctor blade.
  • Measures according to the invention it is therefore possible to ensure a long doctor life even if the doctor blade located upstream is turned negative.
  • the prechamber can be supplied with paint from the paint chamber, which can preferably be pressurized, via at least one overflow opening.
  • a particularly simple design results in an advantageous manner in that the prechamber is separated from the ink chamber only by the doctor blade located upstream and that at least one overflow opening is provided in the area of this doctor blade and / or its receptacle.
  • the prechamber can expediently be provided with a paint overflow, which can be formed in a simple manner in that the prechamber is delimited by a baffle plate which does not touch the anilox roller.
  • the short inking unit on which Firgur 1 is based consists of a rubberized applicator roller 2 which cooperates with a plate cylinder 1 which can be covered with hard offset printing plates, has the same diameter as the plate cylinder and an anilox roller 3 which cooperates with the applicator roller 2 and has a smaller diameter.
  • the circumference of the anilox roller 3, which can have a ceramic cover, is provided with cups 5 indicated in an enlarged manner in FIG. 1 and webs 6 delimiting them. The cups 5 are filled with paint, the webs 6 are scraped off, so that there is an exact dosage of the paint corresponding to the capacity of the cups 5.
  • a chamber doctor blade arrangement designated as a whole by 7 in FIG. 1, which, as can best be seen from FIG. 2, has an ink chamber 13 and 12 delimited by two doctor blades 11, 12 offset from one another in the circumferential direction of the anilox roller 3 one of these upstream, that is to say arranged upstream from the ink chamber 13, has pre-chamber 41.
  • a plurality of chamber doctor blade arrangements 7 arranged next to one another for example two chamber doctor blade arrangements 7 each comprising half a roller length, can be provided.
  • the use of a plurality of chamber doctor blade arrangements 7 arranged next to one another simplifies handling and enables the ink supply of the anilox roller 3 to be shut down zone by zone.
  • the chambered doctor blade arrangement 7 comprises, as can further be seen in FIG. 2, a bar-shaped doctor holder 9 which can be received on supports 8 fixed to the frame and on which the two doctor blades 11, 12 which are offset with respect to one another in the direction of rotation of the anilox roller 3 are accommodated.
  • the doctor blades 11, 12 are held by jaws 10.
  • the jaws 10 can thus be designed as clamping jaws which clamp the respectively assigned doctor blade on the doctor holder 9.
  • the jaws 10, together with the doctor holder 9, are each intended to limit an insertion slot into which the doctor blade assigned in each case is clamped, ie can be inserted loosely.
  • the clear width of the insertion slot is three to four hundredths of a millimeter larger than the thickness of the doctor blade assigned in each case. This ensures that the doctor blades can expand laterally in the event of heating to be feared, in particular when processing offset ink, so that even with low contact force and thus gentle operation, ripple of the doctor blades is prevented and reliable contact of the doctor blades is achieved.
  • both doctor blades 11, 12 rest against the circumference of the anilox roller 3 with a negative angle of attack, that is to say with the circumferential section lying behind an obtuse angle in the direction of rotation of the anilox roller 3. If the direction of rotation of the anilox roller 3 should be reversible, a symmetrical, roof-shaped doctor blade arrangement could also be provided, wherein only the doctor blade located downstream in the direction of rotation of the anilox roller 3 would be negative.
  • the two doctor blades 11, 12 offset from one another form the rear and front limits of the ink chamber 13 in the direction of rotation of the anilox roller 3, the radial limits of which are formed by the doctor blade holder 9 and the circumference of the anilox roller 3.
  • the ink chamber 3 and the pre-chamber 41 are closed on the end face by sealing jaws 43 resting on the end faces of the doctor blades 11, 12.
  • the sealing jaws 43 are gripped in the region of their contact with the doctor blades 11, 12 by finger-shaped abutments 44 which extend in the longitudinal direction of the doctor blades 11 , 12 are resiliently supported on the squeegee holder 9, as indicated at 45.
  • the ink chamber 13 is supplied with paint.
  • the doctor blade holder 9 is provided with a distributor chamber 17 formed by an axial bore, of which several Inlet holes 19 which are uniformly distributed over the length of the doctor holder 9 and exit into the ink chamber 13 and which can be connected via a connection hole 18 to a supply line 15 leading to an ink pump 16.
  • the ink in the ink chamber 13 should be present with a slight overpressure, so that the anilox roller 3 is reliably inked without further aids.
  • the pre-chamber 41 is also supplied with paint.
  • the pre-chamber 41 can be provided with its own paint supply.
  • the pre-chamber 41 is acted upon by excess paint emerging from the ink chamber 13.
  • the ink chamber 13 is in fact provided with overflow openings 24, via which ink can flow, which is returned to the pump 16, so that a color cycle results.
  • These overflow openings 24, as can be seen further in FIG. 2, can be designed as bore-shaped recesses, spaced from the doctor edge, of the upstream doctor blade 11, which acts as a preliminary or closing doctor blade.
  • slots arranged in the area of the doctor blade holder could also be provided as overflow openings.
  • overflow openings 24 are provided which are distributed uniformly over the entire chamber length.
  • the antechamber 41 is delimited by a dust plate 40 arranged approximately parallel to the adjacent doctor blade 11, which does not touch the circumference of the anilox roller 3.
  • the roller-side edge of the baffle plate 40 thus forms an overflow edge delimiting an outlet slot 42.
  • the baffle plate 40 can be molded onto the squeegee holder 9 or the closing squeegee jaws 10 or, as here, be attached.
  • the ink penetrating through the overflow openings 24 is accumulated in the antechamber 41.
  • the excess ink can swell out of the pre-chamber 41 in the area of the outlet gap 42, so that only a complete filling of the pre-chamber 41 is guaranteed, but the occurrence of an undesirable overpressure is not possible.
  • the outlet gap 42 is covered by a drainage channel 14 which catches the excess paint dripping off.
  • a return line 26 leads from the drainage channel 14 to a paint reservoir or directly to the paint pump 16.
  • the circumference of the anilox roller 3 immersed in the pre-chamber 41, to which residues in the form of residual ink, penetrated dampening solution, penetrated dust particles and the like can adhere, is pre-inked in the area of the pre-chamber 41 filled with ink the entire length. This entire order is stripped off by means of the doctor blade 11 arranged downstream of the prechamber 41.
  • the wear of the doctor blade 11 caused earlier by the residues, in particular in the form of the dampening solution is eliminated or at least greatly reduced.
  • doctor blade 41 anilox roller receives its final inking in the region of the ink chamber 13, which is here under slight overpressure, that is to say the filling of the cells 5 is supplemented where something is still missing.
  • the webs 6 are scraped off by means of the doctor blade 12 located downstream. This is referred to as the squeegee.
  • the opposite doctor blade is referred to as the front or closing doctor blade. In the exemplary embodiment shown, both doctor blades 11, 12, as already mentioned above, are made negative.
  • a fixed predetermined direction of rotation of the anilox roller 3 is used, so that only one prechamber 41 is provided which is adjacent to the doctor blade, which acts in each case as a pre-doctor or closing doctor. If the direction of rotation of the anilox roller 3 can be reversed, prechambers could be provided in the area of both doctor blades, with no prechamber not being used in each case by applying a doctor blade with overflow openings only in the region of the prechamber required.

Landscapes

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

Abstract

Below the raster roller (3) is a doctor blade carrier (9) with a blade (11) on the leading side and a second one (12) on the trailing side. The region between them is sunken to form an ink wall (13) for the bottom of the roller. Preceding the leading blade (11) is a space (41) forming a small auxiliary wall which applies ink to the bottom of the roller. The auxiliary wall is connected by an overflow opening (24) to the larger wall, which is under pressure. The opening can be formed by holes through the leading blade from end to end. The auxiliary wall is between the leading blade and a blocking sheet (40), and forms an overflow, with a drip channel (14) underneath.

Description

Die Erfindung betrifft ein Farbwerk, insbesondere ein Kurzfarbwerk, für Druckmaschinen, insbesondere Offset­druckmaschinen, mit wenigstens einer Rasterwalze, der eine Kammerrakelanordnung mit zwei vorzugsweise auf ei­nem Rakelhalter aufgenommenen, in Umfangsrichtung der Rasterwalze gegeneinander versetzten Rakelblättern zuge­ordnet ist, die eine mit Farbe beaufschlagbare Farb­kammer begrenzen, in welche die Rasterwalze eintaucht.The invention relates to an inking unit, in particular a short inking unit, for printing presses, in particular offset printing presses, with at least one anilox roller, which is assigned a chambered doctor blade arrangement with two doctor blades, which are preferably accommodated on a doctor blade holder and are offset with respect to one another in the circumferential direction of the anilox roller and which delimit an ink chamber which can be acted upon by ink. in which the anilox roller is immersed.

Der von der Rasterwalze nachgeordneten Walze, bei Kurzfarbwerken ist dies bereits die Auftragwalze, ablau­fende Umfangsabschnitt der Rasterwalze ist nicht nur nicht mehr voll eingefärbt, sondern in der Regel mit in das Farbwerk eingedrungenen Verunreinigungen in Form von Feuchtmitteln und dergleichen, behaftet. Es besteht daher die Gefahr, daß das in Drehrichtung der Raster­walze hintere Rakelblatt, welches diese Verunreinigungen von der Rasterwalze abstreifen soll und als Vor- bzw. Schließrakel fungiert, vergleichsweise schnell ver­schleißt, da die genannten Verunreinigungen, insbesonde­re in Form des Feuchtmittels, einen Rakelverschleiß außerordentlich begünstigen.The roller arranged downstream of the anilox roller, in short inking units this is already the applicator roller, and the peripheral section of the anilox roller that is running is not only no longer fully dyed, but usually contaminated with impurities in the form of dampening solutions and the like. There is therefore a risk that the doctor blade behind in the direction of rotation of the anilox roller, which should strip these contaminants from the anilox roller and act as a front or closing doctor blade, wears out comparatively quickly, since the said contaminants, particularly in the form of the dampening solution, cause doctor blade wear to be extremely high favor.

Hiervon ausgehend ist es daher die Aufgabe der vorlie­genden Erfindung, ein Farbwerk eingangs erwähnter Art mit einfachen und kostengünstigen Mitteln so zu verbes­sern, daß das als Vor- bzw. Schließrakel fungierende Rakelblatt geschont ist.Proceeding from this, it is therefore the object of the present invention to improve an inking unit of the type mentioned at the outset with simple and inexpensive means in such a way that the doctor blade which acts as a preliminary or closing doctor blade is protected.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Farbkammer eine außerhalb des als Vor- bzw. Schließ­rakel wirkenden, in Drehrichtung der Rasterwalze strom­aufwärts gelegenen Rakelblatts angeordnete, mit Farbe be­aufschlagbare Vorkammer vorgeordnet ist, in welche die Rasterwalze eintaucht.According to the invention, this object is achieved in that the ink chamber is preceded by an inkable pre-chamber outside of the doctor blade, which acts as a front or closing squeegee and is upstream in the direction of rotation of the anilox roller, and into which the anilox roller is immersed.

Die im Bereich der Vorkammer bewirkte Einfärbung der Rasterwalze stellt sicher, daß das aufgrund der abzu­streifenden Verunreinigungen verschleißgefährdete, strom­aufwärts gelegene Rakelblatt auf seiner ganzen Länge mit Farbe beaufschlagt wird, was auch im Falle eines für den Verschleiß ungünstigen Anstellwinkels dieses Rakelblatts einen schonenden Betrieb gewährleistet. Mit Hilfe der erfindungsgemäßen Maßnahmen ist es daher möglich, auch bei negativer Anstellung des stromaufwärts gelege­nen Rakelblatts eine hohe Rakelstandzeit zu gewährleisten.The inking of the anilox roller in the area of the pre-chamber ensures that the entire length of the doctor blade, which is at risk of wear due to the contaminants to be wiped off, is applied over its entire length, which also ensures gentle operation in the event of an unfavorable angle of attack of this doctor blade. With the help of Measures according to the invention it is therefore possible to ensure a long doctor life even if the doctor blade located upstream is turned negative.

In vorteilhafter Weiterbildung der übergeordneten Maß­nahmen kann die Vorkammer über wenigstens eine Über­strömöffnung mit Farbe aus der vorzugsweise mit Über­druck beaufschlagbaren Farbkammer beaufschlagbar sein. Diese Maßnahmen stellen sicher, daß, die Vorkammer keine eigene Farbversorgung benötigt. Vielmehr findet hier die aus der Farbkammer austretende Überschußfarbe zur Vorein­färbung der Rasterwalze Verwendung, was eine einfache Bauweise gewährleistet.In an advantageous further development of the superordinate measures, the prechamber can be supplied with paint from the paint chamber, which can preferably be pressurized, via at least one overflow opening. These measures ensure that the pre-chamber does not need its own paint supply. Rather, the excess ink emerging from the ink chamber is used for pre-inking the anilox roller, which ensures a simple construction.

Eine besonders einfache Auführung ergibt sich dabei in vorteilhafter Weise dadurch, daß die Vorkammer lediglich durch das stromaufwärts gelegene Rakelblatt von der Farb­kammer getrennt ist und daß im Bereich diese Rakel­blatts und/oder seiner Aufnahme wenigstens eine Über­strömöffnung vorgesehen ist.A particularly simple design results in an advantageous manner in that the prechamber is separated from the ink chamber only by the doctor blade located upstream and that at least one overflow opening is provided in the area of this doctor blade and / or its receptacle.

Zweckmäßig kann die Vorkammer mit einem Farbüberlauf versehen sein, der auf einfache Weise dadurch gebildet werden kann, daß die Vorkammer durch eine die Rasterwalze nicht berührendes Staublech begrenzt wird. Diese Maß­nahmen ergeben nicht nur einen verschleißfreien Betrieb im Bereich des Staublechs, sondern vermeiden gleichzei­tig auch die Entstehung eines unerwünscht hohen Über­drucks. Dennoch ist durch die aus der Vorkammer heraus­quellende Farbe eine zuverlässige Voreinfärbung der Rasterwalze gewährleistet.The prechamber can expediently be provided with a paint overflow, which can be formed in a simple manner in that the prechamber is delimited by a baffle plate which does not touch the anilox roller. These measures not only result in wear-free operation in the area of the baffle plate, but at the same time prevent the development of an undesirably high excess pressure. Nevertheless, the ink swelling out of the pre-chamber ensures reliable pre-inking of the anilox roller.

Weitere zweckmäßige Fortbildungen und vorteilhafte Ausgestaltungen der übergeordneten Maßnahmen ergeben sich aus der nachstehenden Beschreibung eines Ausführungs­beispiels anhand der Zeichnung in Verbindung mit den rest­lichen Unteransprüchen.Further expedient further developments and advantageous refinements of the superordinate measures result from the following description of an exemplary embodiment with reference to the drawing in conjunction with the remaining subclaims.

In der Zeichnung zeigen:

  • Figur 1 ein Kurzfarbwerk für eine Rollenrota­tionsoffsetdruckmaschine in schemati­scher Darstellung und
  • Figur 2 einen Radialschnitt durch eine einer Rasterwalze zugeordnete, erfindungsge­mäße Kammerrakelanordnung.
The drawing shows:
  • Figure 1 is a short inking unit for a web rotary offset printing machine in a schematic representation and
  • 2 shows a radial section through a chambered doctor blade arrangement according to the invention assigned to an anilox roller.

Das der Firgur 1 zugrundeliegende Kurzfarbwerk besteht aus einer mit einem mit harten Offsetdruckplatten beleg­baren Plattenzylinder 1 zusammenwirkenden, gummierten Auftragwalze 2 gleichen Durchmessers wie der Plattenzy­linder und einer mit der Auftragwalze 2 zusammenwirken­den, einen kleineren Durchmesser aufweisenden Raster­walze 3. Im Falle der hier vorliegenden Offsetdruckma­schine wirkt die Auftragwalze 2 gleichzeitig mit einem als Ganzes mit 4 bezeichneten Feuchtwerk zusammen. Der Umfang der Rasterwalze 3, die einen Keramikbezug aufwei­sen kann, ist mit in Figur 1 vergrößert angedeuteten Näpfchen 5 und diese begrenzenden Stegen 6 versehen. Die Näpfchen 5 werden mit Farbe gefüllt, die Stege 6 werden abgerakelt, so daß sich eine dem Fassungsvermögen der Näpfchen 5 entsprechende, exakte Dosierung der Farbe er­gibt.The short inking unit on which Firgur 1 is based consists of a rubberized applicator roller 2 which cooperates with a plate cylinder 1 which can be covered with hard offset printing plates, has the same diameter as the plate cylinder and an anilox roller 3 which cooperates with the applicator roller 2 and has a smaller diameter. In the case of the offset printing machine here Applicator roller 2 together with a dampening unit designated as a whole by 4. The circumference of the anilox roller 3, which can have a ceramic cover, is provided with cups 5 indicated in an enlarged manner in FIG. 1 and webs 6 delimiting them. The cups 5 are filled with paint, the webs 6 are scraped off, so that there is an exact dosage of the paint corresponding to the capacity of the cups 5.

Die Farbzufuhr zur Rasterwalze 3 und die Abrakelung erfolgen mittels einer in Figur 1 als Ganzes mit 7 be­zeichneten Kammerrakelanordnung, die, wie am besten aus Figur 2 erkennbar ist, eine durch zwei in Umfangsrich­tung der Rasterwalze 3 gegeneinander versetzte Rakel­blätter 11, 12 begrenzte Farbkammer 13 und eine dieser vorgeordnete, das heißt stromaufwärts von der Farbkammer 13 angeordnete, Vorkammer 41 aufweist. Über der länge der Rasterwalze 3 können mehrer nebeneinander angeord­nete Kammerrakelanordnungen 7, beispielsweise zwei je­weils eine halbe Walzenlänge umfassende Kammerrakelan­ordnungen 7, vorgesehen sein. Es wäre aber auch denkbar, beispielsweise pro Breite der auf dem Plattenzylinder 1 aufgenommenen Druckplatten jeweils eine Kammerrakelan­ordnung 7 vorzusehen. Die Verwendung mehrerer, nebenein­ander angeordneter Kammerrakelanordnungen 7 erleichtert die Handhabung und ermöglicht eine zonenweise Stillegung der Farbversorgung der Rasterwalze 3.The ink supply to the anilox roller 3 and the doctoring take place by means of a chamber doctor blade arrangement, designated as a whole by 7 in FIG. 1, which, as can best be seen from FIG. 2, has an ink chamber 13 and 12 delimited by two doctor blades 11, 12 offset from one another in the circumferential direction of the anilox roller 3 one of these upstream, that is to say arranged upstream from the ink chamber 13, has pre-chamber 41. Over the length of the anilox roller 3, a plurality of chamber doctor blade arrangements 7 arranged next to one another, for example two chamber doctor blade arrangements 7 each comprising half a roller length, can be provided. However, it would also be conceivable to provide, for example, one chamber doctor blade arrangement 7 per width of the printing plates accommodated on the plate cylinder 1. The use of a plurality of chamber doctor blade arrangements 7 arranged next to one another simplifies handling and enables the ink supply of the anilox roller 3 to be shut down zone by zone.

Die Kammerrakelanordnung 7 umfaßt, wie Figur 2 weiter erkennen läßt, einen auf gestellfesten Trägern 8 auf­nehmbaren, balkenförmigen Rakelhalter 9, auf dem die beiden in Drehrichtung der Rasterwalze 3 gegeneinander versetzten Rakelblätter 11, 12 aufgenommen sind. Die Rakelblätter 11, 12 werden durch Backen 10 gehalten. Hierzu können die Backen 10 also Klemmbacken ausgebildet sein, welche das jeweils zugeordnete Rakelblatt am Rakel­halter 9 festklemmen. Im dargestellten Ausführungsbei­speil sollen die Backen 10 zusammen mit dem Rakelhalter 9 jeweils einen Einlegeschlitz begrenzen, in den das jeweils zugeordnete Rakelblatt ohne Klemmung, das heißt lose einlegbar ist. Hierzu besitzt die lichte Weite des Einlegeschlitzes ein Übermaß von drei bis vier hundert­stel Millimetern gegenüber der Dicke des jeweils zuge­ordneten Rakelblatts. Hierdurch wird erreicht, daß sich die Rakelblätter im Falle einer insbesondere bei der Ver­arbeitung von Offsetfarbe zu befürchtenden Erwärmung seitlich ausdehnen können, so daß auch bei geringer An­stellkraft und damit schonender Betriebsweise eine Welligkeit der Rakelblätter verhindert und damit eine zuverlässige Anlage der Rakelblätter erreicht wird. Bei­de Rakelblätter 11, 12 liegen im dargestellten Ausfüh­rungsbeispiel mit negativem Anstellwinkel, das heißt mit mit dem in Drehrichtung der Rasterwalze 3 zurück­liegenden Umfangsabschnitt einen stumpfen Winkel ein­schließender Anstellung, am Umfang der Rasterwalze 3 an. Sofern die Drehrichtung der Rasterwalze 3 umkehrbar sein sollte, könnte auch eine symmetrische, dachförmige Rakelanordnung vorgesehen sein, wobei jeweils nur das in Drehrichtung der Rasterwalze 3 vordere stromabwärts ge­legene Rakelblatt negativ angestellt wäre.The chambered doctor blade arrangement 7 comprises, as can further be seen in FIG. 2, a bar-shaped doctor holder 9 which can be received on supports 8 fixed to the frame and on which the two doctor blades 11, 12 which are offset with respect to one another in the direction of rotation of the anilox roller 3 are accommodated. The doctor blades 11, 12 are held by jaws 10. For this purpose, the jaws 10 can thus be designed as clamping jaws which clamp the respectively assigned doctor blade on the doctor holder 9. In the exemplary embodiment shown, the jaws 10, together with the doctor holder 9, are each intended to limit an insertion slot into which the doctor blade assigned in each case is clamped, ie can be inserted loosely. For this purpose, the clear width of the insertion slot is three to four hundredths of a millimeter larger than the thickness of the doctor blade assigned in each case. This ensures that the doctor blades can expand laterally in the event of heating to be feared, in particular when processing offset ink, so that even with low contact force and thus gentle operation, ripple of the doctor blades is prevented and reliable contact of the doctor blades is achieved. In the exemplary embodiment shown, both doctor blades 11, 12 rest against the circumference of the anilox roller 3 with a negative angle of attack, that is to say with the circumferential section lying behind an obtuse angle in the direction of rotation of the anilox roller 3. If the direction of rotation of the anilox roller 3 should be reversible, a symmetrical, roof-shaped doctor blade arrangement could also be provided, wherein only the doctor blade located downstream in the direction of rotation of the anilox roller 3 would be negative.

Die beiden gegeneinander versetzten Rakelblätter 11, 12 bilden die in Drehrichtung der Rasterwalze 3 hintere und vordere Begrenzung der Farbkammer 13, deren radiale Be­grenzung durch den Rakelhalter 9 und den Umfang der Rasterwalze 3 gebildet werden. Stirnseitig sind die Farb­kammer 3 und die Vorkammer 41 durch an den Stirnseiten der Rakelblätter 11, 12 anliegende Dichtbacken 43 ver­schlossen.The two doctor blades 11, 12 offset from one another form the rear and front limits of the ink chamber 13 in the direction of rotation of the anilox roller 3, the radial limits of which are formed by the doctor blade holder 9 and the circumference of the anilox roller 3. The ink chamber 3 and the pre-chamber 41 are closed on the end face by sealing jaws 43 resting on the end faces of the doctor blades 11, 12.

Diese werden durch mit ihren Seitenkanten in entspre­ chende, am Rakelhalter 9 vorgesehene Führungen 46 ein­steckbare Bleche gebildet. Die lichte Weite der Fühgrungen besitzt soviel Übermaß in Längsrichtung der Rakelblät­ter 11, 12, daß diese sich ausdehnen können. Zur Bewerk­stelligung einer zuverlässigen Anlage der Dichtbacken 43 an den Stirnseiten der Rakelblätter 11, 12 bzw. einer entsprechenden Begrenzung der Vorkammer 41 werden die Dichtbacken 43 im Bereich ihrer Anlage an den Rakelblät­tern 11, 12 von fingerförmigen Widerlagern 44 hinter­faßt, die in Längsrichtung der Rakelblätter 11, 12 fe­dernd am Rakelhalter 9 abgestützt sind, wie bei 45 an­gedeutet ist.These are corresponded with with their side edges Chende, provided on the blade holder 9 guides 46 insertable sheets. The clear width of the guide stanchions has so much excess in the longitudinal direction of the doctor blades 11, 12 that they can expand. To bring about a reliable contact of the sealing jaws 43 on the end faces of the doctor blades 11, 12 or a corresponding limitation of the prechamber 41, the sealing jaws 43 are gripped in the region of their contact with the doctor blades 11, 12 by finger-shaped abutments 44 which extend in the longitudinal direction of the doctor blades 11 , 12 are resiliently supported on the squeegee holder 9, as indicated at 45.

Die Farbkammer 13 wird mit Farbe beaufschlagt. Hierzu ist der Rakelhalter 9 mit einer durch eine Axialbohrung gebildeten Verteilerkammer 17 versehen, von der mehrere, über die Länge des Rakelhalters 9 gleichmäßig verteilte, in die Farbkammer 13 ausmündende Zuströmbohrungen 19 ab­gehen und die über eine Anschlußbohrung 18 an eine zu einer Farbpumpe 16 führende Versorgungsleitung 15 an­schließbar ist. Im dargestellten Ausführungsbeispiel soll die Farbe in der Farbkammer 13 mit leichtem Überdruck anstehen, so daß die Rasterwalze 3 ohne weitere Hilfs­mittel zuverlässig eingefärbt wird. Es wäre aber auch denkbar, im Bereich der Farbkammer 13 eine mit der Raster­walze 3 zusammenwirkende Schöpfwalze anzuordnen. In die­sem Fall könnte auf einen Überdruck und dementsprechend auf eine vollständige Füllung der Farbkammer 13 verzich­tet werden.The ink chamber 13 is supplied with paint. For this purpose, the doctor blade holder 9 is provided with a distributor chamber 17 formed by an axial bore, of which several Inlet holes 19 which are uniformly distributed over the length of the doctor holder 9 and exit into the ink chamber 13 and which can be connected via a connection hole 18 to a supply line 15 leading to an ink pump 16. In the illustrated embodiment, the ink in the ink chamber 13 should be present with a slight overpressure, so that the anilox roller 3 is reliably inked without further aids. However, it would also be conceivable to arrange a scoop roller which interacts with the anilox roller 3 in the region of the ink chamber 13. In this case, overpressure and, accordingly, complete filling of the ink chamber 13 could be dispensed with.

Die Vorkammer 41 wird ebenfalls mit Farbe beaufschlagt. Hierzu kann die Vorkammer 41 mitt einer eigenen Farbver­sorgung versehen sein. Im dargestellten Ausführungsbei­spiel wird die Vorkammer 41 mit aus der Farbkammer 13 austretender Überschußfarbe beaufschlagt. Zur Begrenzung des in der Farbkammer 13 herrschenden Überdrucks ist die Farbkammer 13 nämlich mit Überströmöffnungen 24 versehen, über welche Farbe abströmen kann, die zur Pumpe 16 zu­rückgeleitet wird, so daß sich eine Farbkreislauf ergibt. Diese Überströmöffnungen 24 können, wie Figur 2 weiter erkennen läßt, als von der Rakelkante beabstandete, bohrungsförmige Ausnehmungen des stromaufwärts gelegenen, als Vor- bzw. Schließrakel wirkenden Rakelblatts 11 aus­gebildet sein. Zusätzlich oder alternativ zu diesen Aus­nehmungen des Rakelblatts 11 könnten aber auch im Be­reich der Rakelblattaufnahme angeordnete Schlitze als Überströmöffnungen vorgesehen sein. Zur Erzielung einer möglichst gleichmäßigen Beaufschlagung der Vorkammer 41 auf ihrer ganzen Länge sind mehrere, gleichmäßig über die ganze Kammerlänge verteilte Überströmöffnungen 24 vorgesehen.The pre-chamber 41 is also supplied with paint. For this purpose, the pre-chamber 41 can be provided with its own paint supply. In the exemplary embodiment shown, the pre-chamber 41 is acted upon by excess paint emerging from the ink chamber 13. To limit the overpressure prevailing in the ink chamber 13, the ink chamber 13 is in fact provided with overflow openings 24, via which ink can flow, which is returned to the pump 16, so that a color cycle results. These overflow openings 24, as can be seen further in FIG. 2, can be designed as bore-shaped recesses, spaced from the doctor edge, of the upstream doctor blade 11, which acts as a preliminary or closing doctor blade. In addition or as an alternative to these recesses in the doctor blade 11, slots arranged in the area of the doctor blade holder could also be provided as overflow openings. To achieve a Actuation of the prechamber 41 as uniformly as possible over its entire length, several overflow openings 24 are provided which are distributed uniformly over the entire chamber length.

Die Vorkammer 41 wird durch ein etwa parallel zum be­nachbarten Rakelblatt 11 angeordnetes Staublech 40 be­grenzt, das den Umfang der Rasterwalze 3 nicht berührt. Die walzenseitige Kante des Staublechs 40 bildet somit eine einen Austrittsschlitz 42 begrenzende Überlaufkante. Das Staublech 40 kann an den Rakelhalter 9 oder den schließrakelseitigen Backen 10 angeformt oder, wie hier, angesetzt sein.The antechamber 41 is delimited by a dust plate 40 arranged approximately parallel to the adjacent doctor blade 11, which does not touch the circumference of the anilox roller 3. The roller-side edge of the baffle plate 40 thus forms an overflow edge delimiting an outlet slot 42. The baffle plate 40 can be molded onto the squeegee holder 9 or the closing squeegee jaws 10 or, as here, be attached.

In der Vorkammer 41 wird die über die Überströmöffnungen 24 eindringende Farbe aufgestaut. Die überschüssige Far­be kann im Bereich des Austrittsspalts 42 aus der Vor­kammer 41 herausquellen, so daß lediglich eine völl­ständige Füllung der Vorkammer 41 gewährleistet, aber die Entstehung eines unerwünschten Überdrucks nicht mög­lich ist. Der Austrittsspalt 42 wird von einer Ablauf­rinne 14 unterfaßt, welche die abtropfende Überschußfar­be auffängt. Von der Ablaufrinne 14 führt eine Rücklauf­leitung 26 zu einem Farbvorratsbehälter oder direkt zur Farbpumpe 16.The ink penetrating through the overflow openings 24 is accumulated in the antechamber 41. The excess ink can swell out of the pre-chamber 41 in the area of the outlet gap 42, so that only a complete filling of the pre-chamber 41 is guaranteed, but the occurrence of an undesirable overpressure is not possible. The outlet gap 42 is covered by a drainage channel 14 which catches the excess paint dripping off. A return line 26 leads from the drainage channel 14 to a paint reservoir or directly to the paint pump 16.

Der Umfang der in die Vorkammer 41 eintauchenden Raster­walze 3, an der Rückstände in Form von Restfarbe, einge­drungenen Feuchtmittel, eingedrungenen Staubpartikeln und dergleichen anhaften können, erfährt im Bereich der mit Farbe gefüllten Vorkammer 41 eine Voreinfärbung auf der ganzen Länge. Dieser gesamte Auftrag wird mittels des der Vorkammer 41 nachgeordneten Rakelblatts 11 abge­streift. Infolge der vorher erfolgten vollständigen Ein­färbung der Rasterwalze 3 wird dabei der durch die Rück­stände insbesondere in Form des Feuchtmittels, früher verursachte Verschleiß des Rakelblatts 11 beseitigt oder jedenfalls stark abgemildert.The circumference of the anilox roller 3 immersed in the pre-chamber 41, to which residues in the form of residual ink, penetrated dampening solution, penetrated dust particles and the like can adhere, is pre-inked in the area of the pre-chamber 41 filled with ink the entire length. This entire order is stripped off by means of the doctor blade 11 arranged downstream of the prechamber 41. As a result of the complete inking of the anilox roller 3, the wear of the doctor blade 11 caused earlier by the residues, in particular in the form of the dampening solution, is eliminated or at least greatly reduced.

Die voreingefärbte und mittels des Rakelblatts 41 abge­streifte Rasterwalze erhält im Bereich der hier unter leichtem Überdruck stehenden Farbkammer 13 ihre endgül­tige Einfärbung, das heißt die Füllung der Näpfchen 5 wird da, wo noch etwas fehlt, ergänzt. Am Ausgang der Farbkammer 14 werden die Stege 6 mittels des stromabwärts gelegenen Rakelblatts 12 abgerakelt. Dieses wird dement­sprechend als Arbeitsrakel bezeichnet. Im Gegensatz dazu wird das gegenüberliegende Rakelblatt als Vor- bzw. Schließrakel bezeichnet. Im dargestellten Ausführungsbei­spiel sind beide Rakelblätter 11, 12, wie weiter oben schon erwähnt wurde, negativ angestellt. In diesem Fall wird mit einer fest vorgegebenen Drehrichtung der Raster­walze 3 gearbeitet, so daß lediglich eine dem in jedem Falle als Vor- bzw. Schließrakel fungierenden Rakelblatt benachbarte Vorkammer 41 vorgesehen ist. Im Falle einer Umkehrbarkeit der Drehrichtung der Rasterwalze 3 könnten im Bereich beider Rakelblätter Vorkammern vorgesehen sein, wobei jeweils nicht benötigte Vorkammer nicht mit Farbe beaufschlagt wird, indem lediglich im Bereich der benötigten Vorkammer ein Rakelblatt mit Überströmöff­nungen eingesetzt wird.The pre-inked and stripped by means of the doctor blade 41 anilox roller receives its final inking in the region of the ink chamber 13, which is here under slight overpressure, that is to say the filling of the cells 5 is supplemented where something is still missing. At the exit of the ink chamber 14, the webs 6 are scraped off by means of the doctor blade 12 located downstream. This is referred to as the squeegee. In contrast, the opposite doctor blade is referred to as the front or closing doctor blade. In the exemplary embodiment shown, both doctor blades 11, 12, as already mentioned above, are made negative. In this case, a fixed predetermined direction of rotation of the anilox roller 3 is used, so that only one prechamber 41 is provided which is adjacent to the doctor blade, which acts in each case as a pre-doctor or closing doctor. If the direction of rotation of the anilox roller 3 can be reversed, prechambers could be provided in the area of both doctor blades, with no prechamber not being used in each case by applying a doctor blade with overflow openings only in the region of the prechamber required.

Claims (10)

1. Farbwerk, insbesondere Kurzfarbwerk, für Druckmaschi­nen, insbesondere Offsetdruckmaschinen, mit wenig­stens einer Rasterwalze (3), der eine Kammerrakelan­ordnung (7) mit zwei vorzugsweise auf einem Rakel­halter (9) aufgenommenen, in Umfangsrichtung der Rasterwalze (3) gegeneinander versetzten Rakelblättern (11, 12) zugeordnet ist, die eine mit Farbe beauf­schlagbare Farbkammer (13) begrenzen, in welche die Rasterwalze (3) eintaucht, dadurch gekennzeichnet, daß der Farbkammer (13) mindestens eine außerhalb des als Vor- bzw. Schließrakel wirkenden, in Drehrichtung der Rasterwalze (3) stromaufwärts gelegenen Rakelblatts (11) angeordnete mit Farbe beaufschlagbare Vorkammer (41) vorgeordnet ist, in welche die Rasterwalze (3) eintaucht.1. inking unit, in particular short inking unit, for printing presses, in particular offset printing presses, with at least one anilox roller (3) which has a chambered doctor blade arrangement (7) with two doctor blades (11), which are preferably received on a doctor blade holder (9) and offset in the circumferential direction of the anilox roller (3) , 12) which delimit an ink chamber (13) to which ink can be applied and into which the anilox roller (3) is immersed, characterized in that the ink chamber (13) has at least one outside the one acting as a front or closing doctor, in the direction of rotation of the Anilox roller (3) is arranged upstream of the doctor blade (11) which is arranged and can be supplied with ink and pre-chamber (41) into which the anilox roller (3) is immersed. 2.Farbwerk nach Anspruch 1, dadurch gekennzeichnet, daß die vorzugsweise mit Überdruck beaufschlagbare Farb­kammer (13) mit wenigstens einer zur Vorkammer (41) führenden Überströmöffnung (24) versehen ist.2. inking unit according to claim 1, characterized in that the preferably pressurized ink chamber (13) is provided with at least one overflow opening (24) leading to the prechamber (41). 3. Farbwerk nach Anspruch 2,dadurch gekennzeichnet, daß die Vorkammer (41) durch das benachbarte Rakelblatt (11) von der Farbkammer (13) getrennt ist und daß im Bereich dieses Rakelblatts (11) und/oder seiner Auf­nahme wenigstens eine Überströmöffnung (24) vorgese­hen ist.3. Inking unit according to claim 2, characterized in that the prechamber (41) is separated by the adjacent doctor blade (11) from the ink chamber (13) and that in the area of this doctor blade (11) and / or its receptacle at least one overflow opening (24 ) is provided. 4. Farbwerk nach Anspruch 3, dadurch gekennzeichnet, daß das Rakelblatt (11) mit vorzugsweise über seine Länge gleichmäßig verteilten, von der Rakelkante beabstande­ten Ausnehmungen zur Bildung der Überströmöffnungen (24) versehen ist.4. Inking unit according to claim 3, characterized in that the doctor blade (11) is provided with preferably uniformly distributed over its length, spaced from the doctor edge recesses to form the overflow openings (24). 5. Farbwerk nach einem der vorhergehenden Asprüche, da­durch gekennzeichnet, daßdie Vorkammer (41) mit ei­nem Farbüberlauf versehen ist.5. Inking unit according to one of the preceding claims, characterized in that the antechamber (41) is provided with an ink overflow. 6. Farbwerk nach Anspruch 5, dadurch gekennzeichnet, daß die Vorkammer (41) durch ein vom benachbarten Rakel­blatt (11) beabstandetes, am Rakelhalter (9) aufge­nommenes Staublech (40) begrenzt ist, dessen raster­walzenseitiges Ende eine die Rasterwalze (3) nicht berührende Überlaufkante bildet.6. Inking unit according to claim 5, characterized in that the pre-chamber (41) by a spaced from the adjacent doctor blade (11), on the doctor holder (9) received baffle plate (40) is limited, the end of the anilox roller (3) not touching the anilox roller Overflow edge forms. 7. Farbwerk nach einem der vorhergehenden Ansprüche 5 bis 6, dadurch gekennzeichnet, daß der vorzugsweise durch das Staublech (40) begrenzte Überlaufspalt (42) durch eine Auffangrinne (14) unterfaßt ist.7. Inking unit according to one of the preceding claims 5 to 6, characterized in that the preferably overflow gap (42) bounded by the baffle plate (40) is covered by a collecting channel (14). 8. Farbwerk nach Anspruch 7, dadurch gekennzeichnet, daß die Auffangrinne (14) mit einer zu einem Farbspeicher und/oder einer Farbpumpe (16) führenden Rücklauflei­tung (26) verbunden ist.8. Inking unit according to claim 7, characterized in that the collecting channel (14) with a to an ink reservoir and / or an ink pump (16) leading return line (26) is connected. 9. Farbwerk nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß zumindest das der Vorkammer (41) benachbarte Rakelblatt (11), vorzugsweise beide Rakelblätter (11,12), lose in einen jeweils zugeord­neten Aufnahmeschlitz des Rakelhalters (9) einlegbar sind.9. Inking unit according to one of the preceding claims, characterized in that at least the doctor chamber (41) adjacent doctor blade (11), preferably both doctor blades (11, 12), can be inserted loosely into an associated receiving slot of the doctor holder (9). 10. Farbwerk nach Anspruch 9, dadurch gekennzeichnet, daß zumindest die Farbkammer (13), vorzugsweise die Farb­kammer (13) und die Vorkammer (41), stirnseitig durch an den Stirnseiten der Rakelblätter (11, 12) bzw. der Rakelblätter (11, 12) und des Staublechs (40) in Längsrichtung der Rakelblätter (11, 12) nachgiebig angliegende, vorzugsweise federnd andrückbare Dicht­backen (43) begrenzt ist bzw. sind.10. Inking unit according to claim 9, characterized in that at least the ink chamber (13), preferably the ink chamber (13) and the pre-chamber (41), on the end face on the end faces of the doctor blades (11, 12) or the doctor blades (11, 12) and the baffle plate (40) in the longitudinal direction of the doctor blades (11, 12) resiliently fitting, preferably resiliently pressable sealing jaws (43) is or are limited.
EP88121339A 1988-01-09 1988-12-21 Inking unit Expired - Lifetime EP0324141B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3800411 1988-01-09
DE3800411A DE3800411A1 (en) 1988-01-09 1988-01-09 INK

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EP0324141A2 true EP0324141A2 (en) 1989-07-19
EP0324141A3 EP0324141A3 (en) 1990-08-22
EP0324141B1 EP0324141B1 (en) 1992-07-08

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EP88121337A Expired - Lifetime EP0324139B1 (en) 1988-01-09 1988-12-21 Doctor blade device

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Also Published As

Publication number Publication date
DE3872693D1 (en) 1992-08-13
EP0324139B1 (en) 1992-07-08
US5010815A (en) 1991-04-30
EP0324139A3 (en) 1990-08-08
JPH01222959A (en) 1989-09-06
DE3800411A1 (en) 1989-07-20
EP0324141A3 (en) 1990-08-22
DE3872692D1 (en) 1992-08-13
EP0324141B1 (en) 1992-07-08
EP0324139A2 (en) 1989-07-19
JPH07102687B2 (en) 1995-11-08
US5072669A (en) 1991-12-17
DE3800411C2 (en) 1990-03-29
JPH01225555A (en) 1989-09-08

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