EP0458371A1 - Short inking device - Google Patents

Short inking device Download PDF

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Publication number
EP0458371A1
EP0458371A1 EP91112554A EP91112554A EP0458371A1 EP 0458371 A1 EP0458371 A1 EP 0458371A1 EP 91112554 A EP91112554 A EP 91112554A EP 91112554 A EP91112554 A EP 91112554A EP 0458371 A1 EP0458371 A1 EP 0458371A1
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EP
European Patent Office
Prior art keywords
anilox roller
inking unit
openings
unit according
short inking
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Granted
Application number
EP91112554A
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German (de)
French (fr)
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EP0458371B1 (en
Inventor
Norbert Köbler
Pirmin Göbel
Rudolf Herb
Norbert Weisbrod
Helmut Puschnerat
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Albert Frankenthal AG
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Albert Frankenthal AG
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Application filed by Albert Frankenthal AG filed Critical Albert Frankenthal AG
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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 a short inking unit for a printing machine, in particular for a printing machine that works with a hard printing form, processes high-viscosity printing inks, preferably offset printing machine, with at least one inking unit roller designed as an anilox roller and at least one chamber doctor blade arrangement associated therewith with at least one ink chamber, the circumferential side by two on a doctor blade holder recorded doctor blades offset in the circumferential direction of the anilox roller from one another and sealing jaws bridging on the end face by the doctor blades and resting on the anilox roller and can be supplied with ink which can be supplied via at least one inflow opening and at least one overflow opening can be removed.
  • at least one inking unit roller designed as an anilox roller and at least one chamber doctor blade arrangement associated therewith with at least one ink chamber
  • a short inking unit of this type is known from DE 35 05 598 C2. This is an inking unit for a flexographic printing machine.
  • the known arrangement would be very disadvantageous as an inking unit for an offset printing press.
  • the inflow opening and the overflow opening are located approximately in the middle of the doctor blade holder.
  • overflow opening or openings is or are offset from the inflow opening or openings in the direction of rotation of the anilox roller.
  • the overflow opening or openings can advantageously be arranged in the region of the front corner of the ink chamber in the direction of rotation of the anilox roller. This not only relieves the pressure on the doctor blade at the front in the direction of rotation of the anilox roller, but also cools it particularly well.
  • a further advantageous measure can consist in that the doctor blade holder has a distribution chamber which is continuous over the doctor blade length and from which a plurality of inflow openings, preferably evenly distributed over its length, which are followed by a plurality of overflow openings, preferably evenly distributed over the length.
  • the distribution chamber can be designed as a groove-shaped recess in the doctor blade holder, which receives a piston-shaped, extendable applicator bar that can be adjusted to the anilox roller and contains the inflow openings, whereby the applicator bar can expediently have a pocket open towards the doctor roller, into which the Inflow openings open. This allows a particularly good filling the cups of the anilox roller with the possibility of predosing the ink.
  • the pocket can advantageously have a cross section tapering in the direction of rotation of the anilox roller. This results in a positive inclined scraper edge, so that a comparatively thick ink film can build up on the anilox roller, which is very beneficial in achieving a complete filling of the cup roller.
  • the short inking unit on which FIG. 1 is based consists of a rubberized application roller 2, which cooperates with a plate cylinder 1 covered with hard offset printing plates, has the same diameter as the plate cylinder, and an anilox roller 3, which cooperates with the application roller 2, has a smaller diameter.
  • the applicator roller 2 together with a dampening unit designated as a whole by 4.
  • the circumference of the anilox roller 3, which is made of steel, is provided with cups 5 indicated in FIG. 1 and the 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.
  • 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 in FIG.
  • a plurality of chamber doctor blade arrangements arranged next to one another for example two chamber doctor blade arrangements 7 each comprising half a roller length, can be provided over the length of the anilox roller 3.
  • the use of a plurality of chamber doctor blade arrangements 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 best be seen from FIG. 2, a bar-shaped doctor holder 9 which can be received on fixed supports 8 and on which two doctor blades 11 and 12 held by jaws 10 and offset in the direction of rotation of the associated anilox roller 3 are accommodated.
  • the doctor blades 11 and 12 can be clamped using the jaws 10.
  • the jaws 10 together with the doctor holder 9 are intended to delimit a holding slot into which the doctor blades 11, 12 are loose, ie can be inserted without clamping.
  • the holding slot mentioned has a clear width which is about 3 / 100mm to 4 / 100mm above the thickness of the doctor blade assigned in each case.
  • This unclamped arrangement of the doctor blades 11 and 12 ensures that the doctor blades can expand in their longitudinal direction, provided that heating occurs during operation. As a result of this degree of freedom of the doctor blades, it is achieved that the doctor blades remain straight in the event of heating.
  • the doctor pressure can accordingly be comparatively small, which has a favorable effect on the avoidance of wear.
  • the loose doctor blade arrangement simplifies the doctor blade change.
  • the two doctor blades 11, 12 offset from one another form the rear and front boundaries of an ink chamber 13 in the direction of rotation of the anilox roller 3, the radial boundaries of which are formed by the doctor blade holder 9 or the circumference of the anilox roller 3.
  • the ink chamber 3 is closed on the face side by sealing jaws 27, which bridge the two doctor blades 11, 12 and rest against the circumference of the anilox roller 3.
  • the sealing jaws 27 can be backed up by counterholders, not shown, to ensure reliable contact with the doctor blades.
  • the doctor blade 11 which is at the rear in the direction of rotation of the anilox roller 3, functions as a pre-doctor blade, which wipes off residues such as residual ink, water, dust particles etc. adhering to the peripheral section of the anilox roller 3 coming back from the contact area with the applicator roller 2.
  • the Residues wiped off the doctor blade 11 are collected by a drainage channel 14 underneath it, arranged with a slope.
  • the doctor blade at the front in the direction of rotation of the anilox roller 3 acts as the main doctor blade, which, after the inking of the periphery of the anilox roller 3 has been inked, scrapes off the webs 6.
  • the doctor blades 11, 12 can be arranged symmetrically to an imaginary central longitudinal plane, i. H. be inclined towards each other in a roof shape, so that the doctor blade acting as the main doctor blade is set negatively, i.e. includes an obtuse angle with the circumferential section of the anilox roller 3 that lies behind in the direction of rotation of the anilox roller 3.
  • both doctor blades 11, 12 rest against the circumference of the anilox roller 3 with a negative angle of attack, the direction of rotation indicated by an arrow cannot be reversed here.
  • the negative inclination of the two doctor blades 11, 12 ensures that hydrodynamic interference does not occur in the area of the main doctor blade as well as in the area of the pre-doctor blade, even at high speeds of rotation of the anilox roller 3.
  • the front doctor blade 12 in the direction of rotation can be set somewhat steeper than the rear doctor blade 11.
  • the ink chamber 13 is supplied with ink.
  • the ink chamber 13 can be connected to an ink pump 16 in a pressure-tight manner by means of a supply line 15 which is only indicated schematically.
  • the squeegee holder 9 can have inflow bores opening out into the ink chamber 13 be provided, via which the supply line 15 is connected directly to the ink chamber 13.
  • a distributor chamber 17 accommodated in the doctor blade holder 9 is provided.
  • This is designed as a groove-shaped recess in the doctor blade holder 9, which is closed on the roller side by an application bar 20 which is accommodated in a floating manner and which lies in the area between the two doctor blade blades 11 and 12 on the circumference of the anilox roller 3.
  • the application bar 20 is provided with a plurality of inflow bores 19a, which are distributed uniformly over its length. These open into a pocket 21 which is provided in the region of the roller-side surface of the application bar 20 and is continuous in the longitudinal direction.
  • the pocket 21 has a cross section tapering in the direction of rotation of the anilox roller 3.
  • the extension of the application bar 20 is supported by a spring 23 which engages under it and is supported on the doctor holder 9.
  • the distribution chamber 17 is accessible from the outside via a connection bore 18 opening outwards, to which the supply line 15 can be connected.
  • the ink pump 16 circulates the ink, the ink in the ink chamber 13 with a slight overpressure, which a good filling of the cells 5 is guaranteed.
  • excess ink is discharged through one or preferably a plurality of overflow openings 25a distributed uniformly over the length. These are arranged near the front corner of the ink chamber 13 in the direction of rotation of the anilox roller 3 and are formed by bores of the doctor blade holder 9 opening outwards, to which a pressure-free return line 26 can be connected.
  • the placement of the overflow openings 25a in the area adjacent to the doctor blade 12 results in a relief and good cooling of this doctor blade.
  • the flow of the ink runs in the direction of rotation of the anilox roller, so that a vortex-free laminar flow can form. Impurities are quickly and reliably removed from the ink chamber with the ink, so that no accumulations can form in it.

Landscapes

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

Abstract

The short inking mechanism is particularly for an offset printing press using highly viscous ink in conjunction with a hard printing block.The notched inking roller(3) works with a wiper(7) having an ink chamber(13) between two wiper blades (11,12) spaced apart in the peripheral direction and mounted in a holder(9) and sealing faces (27) at the ends. Feed and overflow ports (19a,25a) supply and discharge ink to from the chamber. The overflow ports (25a) are offset from the feed ports(19) in the direction of rotation of the roller, and can be at the leading edge.

Description

Die Erfindung betrifft ein Kurzfarbwerk für eine Druckmaschine, insbesondere für eine mit einer harten Druckform arbeitende, Hochviskosedruckfarben verarbeitende Druckmaschine, vorzugsweise Offsetdruckmaschine, mit wenigstens einer als Rasterwalze ausgebildeten Farbwerkswalze und wenigstens einer dieser zugeordneten Kammerrakelanordnung mit wenigstens einer Farbkammer, die umfangsseitig durch zwei auf einem Rakelhalter aufgenommene, in Umfangsrichtung der Rasterwalze gegeneinander versetzte Rakelblätter und stirnseitig durch die Rakelblätter überbrückende, an der Rasterwalze anliegende Dichtbacken begrenzt und mit Farbe versorgbar ist, die über wenigstens eine Zuströmöffnung zu- und wenigstens eine Überströmöffnung abführbar ist.The invention relates to a short inking unit for a printing machine, in particular for a printing machine that works with a hard printing form, processes high-viscosity printing inks, preferably offset printing machine, with at least one inking unit roller designed as an anilox roller and at least one chamber doctor blade arrangement associated therewith with at least one ink chamber, the circumferential side by two on a doctor blade holder recorded doctor blades offset in the circumferential direction of the anilox roller from one another and sealing jaws bridging on the end face by the doctor blades and resting on the anilox roller and can be supplied with ink which can be supplied via at least one inflow opening and at least one overflow opening can be removed.

Ein Kurzfarbwerk dieser Art ist aus der DE 35 05 598 C2 bekannt. Hierbei handelt es sich um ein Farbwerk für eine Flexodruckmaschine. Als Farbwerk für eine Offsetdruckmaschine wäre die bekannte Anordnung sehr nachteilig. Bei der bekannten Anordnung befinden sich nämlich die Zuströmöffnung und die Überströmöffnung etwa in der Mitte des Rakelhalters. Bei der Verarbeitung von Offsetfarbe, die wesentlich zähflüssiger ist, als Flexodruckfarbe und mit Wasser in Berührung kommt, bestünde die Gefahr einer Ansammlung von Wasser, einer Entstehung von Luft- und Dampfblasen sowie einer Ausbildung von Wirbeln in der Farbkammer. Die Folge davon wären eine Emulsionsbildung sowie eine schlechte Tonempfindlichkeit.A short inking unit of this type is known from DE 35 05 598 C2. This is an inking unit for a flexographic printing machine. The known arrangement would be very disadvantageous as an inking unit for an offset printing press. In the known arrangement, the inflow opening and the overflow opening are located approximately in the middle of the doctor blade holder. When processing offset ink, which is much more viscous than flexographic printing ink and comes into contact with water, there is a risk of water accumulation, the formation of air and steam bubbles and the formation of eddies in the ink chamber. This would result in emulsion formation and poor tone sensitivity.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, ein Kurzfarbwerk eingangs erwähnter Art mit einfachen und kostengünstigen Mitteln so zu verbessern, daß auch bei der Verarbeitung zäher, mit Wasser in Bührung kommender Farben ein störungsfreier Betrieb und eine hohe Qualität erreicht werden.Proceeding from this, it is therefore the object of the present invention to improve a short inking unit of the type mentioned at the outset with simple and inexpensive means in such a way that trouble-free operation and high quality are achieved even when processing tough colors which come into contact with water.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Überströmöffnung bzw. -öffnungen gegenüber der Zuströmöffnung bzw. -öffnungen in Drehrichtung der Rasterwalze versetzt angeordnet ist bzw. sind.This object is achieved in that the overflow opening or openings is or are offset from the inflow opening or openings in the direction of rotation of the anilox roller.

Diese Maßnahmen ergeben in vorteilhafter Weise in der Farbkammer einen Farbfluß in Drehrichtung der Rasterwalze, also mit der Rasterwalze. Der Durchfluß von Farbe durch die Farbkammer wird daher durch die Rasterwalze unterstützt und vergleichmäßigt. Es kann sich dementsprechend eine wirbelfreie Laminarströmung ausbilden, die so schnell ist, daß sich keine nennenswerten Ansammlungen von Verunreinigungen wie Wasser-, Luft- und Dampfblasen etc., bilden können. Der Verdampfung von Wasser wird durch die Kühlwirkung des Farbstroms wirksam entgegengewirkt. Mit Hilfe der erfindungsgemäßen Maßnahmen wird demnach eine Emulsionsbildung weitgehend verhindert und eine ausgezeichnete Tonempfindlichkeit erreicht.These measures advantageously result in an ink flow in the direction of rotation of the anilox roller, that is to say with the anilox roller, in the ink chamber. The flow of ink through the ink chamber is therefore supported and evened out by the anilox roller. Accordingly, a vortex-free laminar flow can develop It is quick that no significant accumulations of impurities such as water, air and steam bubbles etc. can form. The evaporation of water is effectively counteracted by the cooling effect of the ink flow. With the help of the measures according to the invention, emulsion formation is largely prevented and excellent sound sensitivity is achieved.

Vorteilhaft können die Überstromöffnung bzw. -öffnungen im Bereich der in Drehrichtung der Rasterwalze vorderen Ecke der Farbkammer angeordnet sein. Hierdurch wird nicht nur das in Drehrichtung der Rasterwalze vordere Rakelblatt entlastet, sondern auch besonders gut gekühlt.The overflow opening or openings can advantageously be arranged in the region of the front corner of the ink chamber in the direction of rotation of the anilox roller. This not only relieves the pressure on the doctor blade at the front in the direction of rotation of the anilox roller, but also cools it particularly well.

Eine weitere vorteilhafte Maßnahme kann darin bestehen, daß der Rakelhalter eine über die Rakellänge durchgehende Verteilerkammer aufweist, von der mehrere, vorzugsweise gleichmäßig über ihre Länge verteilte Zuströmöffnungen abgehen, denen mehrere, vorzugsweise gleichmäßig über die Länge verteilte Überströmöffnungen nachgeordnet sind. Diese Maßnahmen ergeben in vorteilhafter Weise gleichmäßige Verhältnisse auf der ganzen Länge einer Farbkammer.A further advantageous measure can consist in that the doctor blade holder has a distribution chamber which is continuous over the doctor blade length and from which a plurality of inflow openings, preferably evenly distributed over its length, which are followed by a plurality of overflow openings, preferably evenly distributed over the length. These measures advantageously result in uniform conditions along the entire length of an ink chamber.

In weiterer Fortbildung der übergeordneten Maßnahmen kann die Verteilerkammer als nutförmige Ausnehmung des Rakelhalters ausgebildet sein, die eine kolbenförmig ausfahrbare, an die Rasterwalze anstellbare Auftragleiste aufnimmt, welche die Zuströmöffnungen enthält, wobei die Auftragleiste zweckmäßig eine zur Rakelwalze hin offene Tasche aufweisen kann, in welche die Zuströmöffnungen einmünden. Hiermit läßt sich eine besonders gute Füllung der Näpfchen der Rasterwalze bei gleichzeitiger Möglichkeit einer Vordosierung der Farbe erzielen.In a further development of the higher-level measures, the distribution chamber can be designed as a groove-shaped recess in the doctor blade holder, which receives a piston-shaped, extendable applicator bar that can be adjusted to the anilox roller and contains the inflow openings, whereby the applicator bar can expediently have a pocket open towards the doctor roller, into which the Inflow openings open. This allows a particularly good filling the cups of the anilox roller with the possibility of predosing the ink.

Vorteilhaft kann die Tasche einen in Drehrichtung der Rasterwalze spitz auslaufenden Querschnitt aufweisen. Hierdurch ergibt sich eine positiv geneigte Abstreifkante, sodaß sich ein vergleichsweise dicker Farbfilm auf der Rasterwalze aufbauen kann, was der Erzielung einer vollständigen Füllung der Näpfchenwalze sehr zuträglich ist.The pocket can advantageously have a cross section tapering in the direction of rotation of the anilox roller. This results in a positive inclined scraper edge, so that a comparatively thick ink film can build up on the anilox roller, which is very beneficial in achieving a complete filling of the cup roller.

Weitere vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den weiteren Unteransprüchen angegeben.Further advantageous refinements and expedient further training of the superordinate measures are specified in the further subclaims.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. In der Zeichnung zeigen:

Figur 1
ein erfindungsgemäßes Kurzfarbwerk für eine Rotationsoffsetdruckmaschine in schematischer Darstellung und
Figur 2
einen Radialschnitt durch die erfindungsgemäße Kammerrakelanordnung.
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. The drawing shows:
Figure 1
a short inking unit according to the invention for a rotary offset printing machine in a schematic representation and
Figure 2
a radial section through the chambered doctor blade arrangement according to the invention.

Das der Figur 1 zugrundeliegende Kurzfarbwerk besteht aus einer mit einem mit harten Offsetdruckplatten belegten 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 aus Stahl bestehenden Rasterwalze 3 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, sodaß sich eine dem Fassungsvermögen der Näpfchen 5 entsprechende, exakte Dosierung der Farbe ergibt. Die Farbzufuhr zur Rasterwalze 3 und die Abrakelung erfolgen mittels einer in Figur 1 als Ganzes mit 7 bezeichneten Kammerrakelanordnung. Über der Länge der Rasterwalze 3 können mehrere, nebeneinander angeordnete Kammerrakelanordnungen, 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 erleichtert die Handhabung und ermöglicht eine zonenweise Stillegung der Farbversorgung der Rasterwalze 3.The short inking unit on which FIG. 1 is based consists of a rubberized application roller 2, which cooperates with a plate cylinder 1 covered with hard offset printing plates, has the same diameter as the plate cylinder, and an anilox roller 3, which cooperates with the application roller 2, has a smaller diameter. In the case of the present offset printing machine the applicator roller 2 together with a dampening unit designated as a whole by 4. The circumference of the anilox roller 3, which is made of steel, is provided with cups 5 indicated in FIG. 1 and the 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. 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 in FIG. A plurality of chamber doctor blade arrangements arranged next to one another, for example two chamber doctor blade arrangements 7 each comprising half a roller length, can be provided over the length of the anilox roller 3. 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 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 am besten aus Figur 2 erkennbar ist, einen auf gestellfesten Trägern 8 aufnehmbaren, balkenförmigen Rakelhalter 9, auf dem zwei in Drehrichtung der zugeordneten Rasterwalze 3 gegeneinander versetzte, durch Backen 10 gehaltene Rakelblätter 11 bzw. 12 aufgenommen sind. Die Rakelblätter 11 bzw. 12 können mit Hilfe der Backen 10 eingespannt sein. Im dargestellten Ausführungsbeispiel sollen die Backen 10 zusammen mit dem Rakelhalter 9 einen Halteschlitz begrenzen, in den die Rakelblätter 11, 12 lose, d. h. ohne Einspannung eingelegt werden können. Hierzu besitzt der genannte Halteschlitz eine lichte Weite, die etwa 3/100mm bis 4/100mm über der Dicke des jeweils zugeordneten Rakelblatts liegt. Durch diese uneingespannte Anordnung der Rakelblätter 11 bzw. 12 ist sichergestellt, daß sich die Rakelblätter in ihrer Längsrichtung ausdehnen können, sofern es im Laufe des Betriebs zu einer Erwärmung kommt. Infolge dieses Freiheitsgrads der Rakelblätter wird erreicht, daß die Rakelblätter im Falle einer Erwärmung gerade bleiben. Die Rakelanpreßkraft kann dementsprechend vergleichsweise klein sein, was sich günstig auf die Vermeidung von Verschleiß auswirkt. Gleichzeitig ergibt die lose Rakelblattanordnung eine Vereinfachung des Rakelblattwechsels.The chambered doctor blade arrangement 7 comprises, as can best be seen from FIG. 2, a bar-shaped doctor holder 9 which can be received on fixed supports 8 and on which two doctor blades 11 and 12 held by jaws 10 and offset in the direction of rotation of the associated anilox roller 3 are accommodated. The doctor blades 11 and 12 can be clamped using the jaws 10. In the exemplary embodiment shown, the jaws 10 together with the doctor holder 9 are intended to delimit a holding slot into which the doctor blades 11, 12 are loose, ie can be inserted without clamping. For this purpose, the holding slot mentioned has a clear width which is about 3 / 100mm to 4 / 100mm above the thickness of the doctor blade assigned in each case. This unclamped arrangement of the doctor blades 11 and 12 ensures that the doctor blades can expand in their longitudinal direction, provided that heating occurs during operation. As a result of this degree of freedom of the doctor blades, it is achieved that the doctor blades remain straight in the event of heating. The doctor pressure can accordingly be comparatively small, which has a favorable effect on the avoidance of wear. At the same time, the loose doctor blade arrangement simplifies the doctor blade change.

Die beiden gegeneinander versetzten Rakelblätter 11, 12 bilden die in Drehrichtung der Rasterwalze 3 hintere und vordere Begrenzung einer Farbkammer 13, deren radiale Begrenzungen durch den Rakelhalter 9 bzw. den Umfang der Rasterwalze 3 gebildet werden. Stirnseitig ist die Farbkammer 3 durch Dichtbacken 27 verschlossen, welche die beiden Rakelblätter 11, 12 überbrücken und am Umfang der Rasterwalze 3 anliegen. Die Dichtbacken 27 können zur Gewährleistung einer zuverlässigen Anlage an den Rakelblättern von nicht näher dargestellten Gegenhaltern hinterfaßt sein.The two doctor blades 11, 12 offset from one another form the rear and front boundaries of an ink chamber 13 in the direction of rotation of the anilox roller 3, the radial boundaries of which are formed by the doctor blade holder 9 or the circumference of the anilox roller 3. The ink chamber 3 is closed on the face side by sealing jaws 27, which bridge the two doctor blades 11, 12 and rest against the circumference of the anilox roller 3. The sealing jaws 27 can be backed up by counterholders, not shown, to ensure reliable contact with the doctor blades.

Das in Drehrichtung der Rasterwalze 3 hintere Rakelblatt 11 fungiert jeweils als Vorrakel, das am vom Berührungsbereich mit der Auftragwalze 2 zurückkommenden Umfangsabschnitt der Rasterwalze 3 anhaftende Rückstände wie Restfarbe, Wasser, Staubpartikel etc. abstreift. Die vom Rakelblatt 11 abgestreiften Rückstände werden durch eine es unterfassende, mit Gefälle angeordnete Ableitrinne 14 aufgefangen. Das in Drehrichtung der Rasterwalze 3 vordere Rakelblatt fungiert als Hauptrakel, das nach erfolgter Einfärbung des Umfangs der Rasterwalze 3 die Stege 6 abrakelt.The doctor blade 11, which is at the rear in the direction of rotation of the anilox roller 3, functions as a pre-doctor blade, which wipes off residues such as residual ink, water, dust particles etc. adhering to the peripheral section of the anilox roller 3 coming back from the contact area with the applicator roller 2. The Residues wiped off the doctor blade 11 are collected by a drainage channel 14 underneath it, arranged with a slope. The doctor blade at the front in the direction of rotation of the anilox roller 3 acts as the main doctor blade, which, after the inking of the periphery of the anilox roller 3 has been inked, scrapes off the webs 6.

Die Rakelblätter 11, 12 können bei erwünschter Umkehrbarkeit der Laufrichtung der Rasterwalze 3 symmetrisch zu einer gedachten Mittellängsebene angeordnet, d. h. dachförmig gegeneinander geneigt sein, sodaß das als Hauptrakel wirkende Rakelblatt negativ angestellt ist, d.h. mit dem in Drehrichtung der Rasterwalze 3 zurückliegenden Umfangsabschnitt der Rasterwalze 3 einen stumpfen Winkel einschließt. Bei der Ausführung gemäß Figuren 2 und 3 liegen beide Rakelblätter 11, 12 mit negativem Anstellwinkel am Umfang der Rasterwalze 3 an, deren durch einen Pfeil angedeutete Drehrichtung hier nicht umkehrbar ist. Die negative Anstellung der beiden Rakelblätter 11, 12 stellt sicher, daß sowohl im Bereich der Hauptrakel als auch im Bereich der Vorrakel auch bei hohen Drehgeschwindigkeiten der Rasterwalze 3 hydrodynamische Störeinflüsse unterbleiben. Das in Drehrichtung vordere Rakelblatt 12 kann etwas steiler als das hintere Rakelblatt 11 angestellt sein.With the desired reversibility of the running direction of the anilox roller 3, the doctor blades 11, 12 can be arranged symmetrically to an imaginary central longitudinal plane, i. H. be inclined towards each other in a roof shape, so that the doctor blade acting as the main doctor blade is set negatively, i.e. includes an obtuse angle with the circumferential section of the anilox roller 3 that lies behind in the direction of rotation of the anilox roller 3. In the embodiment according to FIGS. 2 and 3, both doctor blades 11, 12 rest against the circumference of the anilox roller 3 with a negative angle of attack, the direction of rotation indicated by an arrow cannot be reversed here. The negative inclination of the two doctor blades 11, 12 ensures that hydrodynamic interference does not occur in the area of the main doctor blade as well as in the area of the pre-doctor blade, even at high speeds of rotation of the anilox roller 3. The front doctor blade 12 in the direction of rotation can be set somewhat steeper than the rear doctor blade 11.

Zur Einfärbung der Rasterwalze 3 wird die Farbkammer 13 mit Farbe beaufschlagt. Hierzu ist die Farbkammer 13, wie Figur 2 zeigt, mittels einer lediglich schematisch angedeuteten Versorgungsleitung 15 an eine Farbpumpe 16 druckdicht anschließbar. Hierzu kann der Rakelhalter 9 mit in die Farbkammer 13 ausmündenden Zuströmbohrungen versehen sein, über die die Versorgungsleitung 15 direkt mit der Farbkammer 13 verbunden wird.To ink the anilox roller 3, the ink chamber 13 is supplied with ink. For this purpose, as shown in FIG. 2, the ink chamber 13 can be connected to an ink pump 16 in a pressure-tight manner by means of a supply line 15 which is only indicated schematically. For this purpose, the squeegee holder 9 can have inflow bores opening out into the ink chamber 13 be provided, via which the supply line 15 is connected directly to the ink chamber 13.

Beim dargestellten Beispiel ist eine im Rakelhalter 9 untergebrachte Verteilerkammer 17 vorgesehen. Diese ist als nutförmige Ausnehmung des Rakelhalters 9 ausgebildet, die durch eine schwimmend hierin aufgenommene Auftragleiste 20, die im Bereich zwischen den beiden Rakelblättern 11 und 12 am Umfang der Rasterwalze 3 anliegt, walzenseitig abgeschlossen ist. Die Auftragleiste 20 ist mit mehreren, gleichmäßig über ihre Länge verteilten Zuströmbohrungen 19a versehen. Diese münden in eine im Bereich der walzenseitigen Oberfläche der Auftragleiste 20 vorgesehene, in Längsrichtung durchgehende Tasche 21 aus. Die Tasche 21 besitzt einen in Drehrichtung der Rasterwalze 3 spitz auslaufenden Querschnitt. Die in Drehrichtung vordere Kante 22 der Auftragleiste 20 wirkt dementsprechend als positiv angestellte Abstreifkante, die jedoch aufgrund der infolge ihrer positiven Anstellung wirksam werdenden hydrodynamischen Kräfte von einem dicken Farbfilm passiert werden kann. Die in der die Verteilerkammer 17 bildenden Ausnehmung schwimmend angeordnete Auftragleiste 20 ist mittels des an ihrer Unterseite anstehenden Farbdrucks kolbenförmig ausfahrbar. Im dargestellten Ausführungsbeispiel wird der Ausschub der Auftragleiste 20 durch eine sie untergreifende, am Rakelhalter 9 abgstützte Feder 23 unterstützt. Die Verteilerkammer 17 ist über eine nach außen ausmündende Anschlußbohrung 18 von außen zugänglich, an die die Versorgungsleitung 15 anschließbar ist.In the example shown, a distributor chamber 17 accommodated in the doctor blade holder 9 is provided. This is designed as a groove-shaped recess in the doctor blade holder 9, which is closed on the roller side by an application bar 20 which is accommodated in a floating manner and which lies in the area between the two doctor blade blades 11 and 12 on the circumference of the anilox roller 3. The application bar 20 is provided with a plurality of inflow bores 19a, which are distributed uniformly over its length. These open into a pocket 21 which is provided in the region of the roller-side surface of the application bar 20 and is continuous in the longitudinal direction. The pocket 21 has a cross section tapering in the direction of rotation of the anilox roller 3. The front edge 22 of the applicator bar 20 in the direction of rotation accordingly acts as a positive scraper edge, which, however, can be passed through by a thick ink film due to the hydrodynamic forces which become effective as a result of its positive position. The application bar 20, which is arranged in a floating manner in the recess forming the distribution chamber 17, can be extended in a piston-like manner by means of the color pressure applied to its underside. In the exemplary embodiment shown, the extension of the application bar 20 is supported by a spring 23 which engages under it and is supported on the doctor holder 9. The distribution chamber 17 is accessible from the outside via a connection bore 18 opening outwards, to which the supply line 15 can be connected.

Die Farbpumpe 16 wälzt die Farbe um, wobei die Farbe in der Farbkammer 13 mit leichtem Überdruck ansteht, was eine gute Füllung der Näpfchen 5 gewährleistet. Zur Vermeidung von unerwünschtem Druck und zur Erzielung eines Farbkreislaufes wird überschüssige Farbe über eine oder vorzugsweise mehrere, gleichmäßig über die Länge verteilte Überströmöffnungen 25a abgeführt. Diese sind nahe der in Drehrichtung der Rasterwalze 3 vorderen Ecke der Farbkammer 13 angeordnet und werden durch nach außen ausmündende Bohrungen des Rakelhalters 9 gebildet, an die eine drucklose Rückflußleitung 26 anschließbar ist. Die Plazierung der Überströmöffnungen 25a in dem dem Rakelblatt 12 benachbarten Bereich ergibt eine Entlastung und gute Kühlung dieses Rakelblatts. Die Strömung der Farbe verläuft dabei in Drehrichtung der Rasterwalze, sodaß sich eine wirbelfreie Laminarströmung ausbilden kann. Verunreinigungen werden mit der Farbe schnell und zuverlässig aus der Farbkammer abgeführt, sodaß sich in dieser keine Ansammlungen hiervon bilden können.The ink pump 16 circulates the ink, the ink in the ink chamber 13 with a slight overpressure, which a good filling of the cells 5 is guaranteed. In order to avoid undesired printing and to achieve a color cycle, excess ink is discharged through one or preferably a plurality of overflow openings 25a distributed uniformly over the length. These are arranged near the front corner of the ink chamber 13 in the direction of rotation of the anilox roller 3 and are formed by bores of the doctor blade holder 9 opening outwards, to which a pressure-free return line 26 can be connected. The placement of the overflow openings 25a in the area adjacent to the doctor blade 12 results in a relief and good cooling of this doctor blade. The flow of the ink runs in the direction of rotation of the anilox roller, so that a vortex-free laminar flow can form. Impurities are quickly and reliably removed from the ink chamber with the ink, so that no accumulations can form in it.

Claims (10)

Kurzfarbwerk für eine Druckmaschine, insbesondere für eine mit einer harten Druckform arbeitende, Hochviskosedruckfarben verarbeitende Druckmaschine, vorzugsweise Offsetdruckmaschine, mit wenigstens einer als Rasterwalze (3) ausgebildeten Farbwerkswalze und wenigstens einer dieser zugeordneten Kammerrakelanordnung (7) mit wenigstens einer Farbkammer (13), die umfangsseitig durch zwei auf einem Rakelhalter (9) aufgenommene, in Umfangsrichtung der Rasterwalze (3) gegeneinander versetzte Rakelblätter (11, 12) und stirnseitig durch die Rakelblätter (11, 12) überbrückende, an der Rasterwalze (3) anliegende Dichtbacken (27) begrenzt und mit Farbe versorgbar ist, die über wenigstens eine Zuströmöffnung (19a) zu- und wenigstens eine Überströmöffnung (25a) abführbar ist, dadurch gekennzeichnet, daß die Überströmöffnung bzw. -öffnungen (25a) gegenüber der Zuströmöffnung bzw. -öffnungen (19a) in Drehrichtung der Rasterwalze (3) versetzt angeordnet ist bzw. sind.Short inking unit for a printing press, in particular for a printing machine which processes high-viscosity printing inks and works with a hard printing form, preferably offset printing press, with at least one inking unit roller designed as anilox roller (3) and at least one chambered doctor blade arrangement (7) with at least one ink chamber (13) on the circumference limited by two squeegee blades (11, 12) accommodated on a squeegee holder (9) and offset in the circumferential direction of the anilox roller (3) and sealing jaws (27) bridging on the end side by the squeegee blades (11, 12) and can be supplied with paint which can be fed in via at least one inflow opening (19a) and at least one overflow opening (25a), characterized in that the overflow opening or openings (25a) relative to the inflow opening or openings (19a) in the direction of rotation the anilox roller (3) is or are offset. Kurzfarbwerk nach Anspruch 1, dadurch gekennzeichnet, daß die Überströmöffnung bzw. -öffnungen (25a) im Bereich der in Drehrichtung der Rasterwalze (3) vorderen Ecke der Farbkammer (13) angeordnet ist bzw. sind.Short inking unit according to claim 1, characterized in that the overflow opening or openings (25a) is or are arranged in the region of the front corner of the ink chamber (13) in the direction of rotation of the anilox roller (3). Kurzfarbwerk nach Anspruch 2, dadurch gekennzeichnet, daß die Überströmöffnung bzw. -öffnungen (25a) als im Bereich der in Drehrichtung der Rasterwalze (3) vorderen Ecke der Farbkammer angeordnete, dem in Drehrichtung der Rasterwalze (3) vorderen Rakelblatt (12) benachbarte Bohrung bzw. Bohrungen des Rakelhalters (9) ausgebildet sind.Short inking unit according to claim 2, characterized in that the overflow opening or openings (25a) are arranged as a bore located in the area of the front corner of the ink chamber in the direction of rotation of the anilox roller (3) and adjacent to the doctor blade (12) in the direction of rotation of the anilox roller (3) or bores of the doctor holder (9) are formed. Kurzfarbwerk nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Rakelhalter (9) eine über die Länge der Farbkammer durchgehende Verteilerkammer (17) aufweist, von der mehrere, vorzugsweise gleichmäßig über ihre Länge verteilte Zuströmöffnungen (19a) abgehen, denen mehrere, vorzugsweise gleichmäßig über die Länge der Farbkammer (13) verteilte Überströmöffnungen (25a) nachgeordnet sind.Short inking unit according to one of the preceding claims, characterized in that the squeegee holder (9) has a distribution chamber (17) which is continuous over the length of the ink chamber and from which a plurality of inflow openings (19a), preferably evenly distributed over their length, depart, several of which, preferably evenly Overflow openings (25a) distributed over the length of the ink chamber (13) are arranged downstream. Kurzfarbwerk nach Anspruch 4, dadurch gekennzeichnet, daß die Verteilerkammer (17) als nutförmige Ausnehmung des Rakelhalters (9) ausgebildet ist, die eine kolbenförmig ausfahrbare, an die Rasterwalze (3) anstellbare Auftragleiste (20) aufnimmt, welche die Zuströmöffnungen (19a) enthält.Short inking unit according to claim 4, characterized in that the distributor chamber (17) is designed as a groove-shaped recess in the doctor blade holder (9) which receives a piston-like extendable applicator bar (20) which can be adjusted to the anilox roller (3) and which contains the inflow openings (19a) . Kurzfarbwerk nach Anspruch 5, dadurch gekennzeichnet, daß die Auftragleiste (20) mittels einer Federanord-(23) an die Rasterwalze (3) anstellbar ist.Short inking unit according to claim 5, characterized in that the application bar (20) can be set against the anilox roller (3) by means of a spring arrangement (23). Kurzfarbwerk nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Auftragleiste (20) eine zur Rasterwalze (3) hin offene Tasche (21) aufweist, in welche die Zuströmöffnungen (19a) einmünden.Short inking unit according to claim 5 or 6, characterized in that the application bar (20) has a pocket (21) which is open towards the anilox roller (3) and into which the inflow openings (19a) open. Kurzfarbwerk nach Anspruch 7, dadurch gekennzeichnet, daß die Tasche (21) einen in Drehrichtung der Rasterwalze (3) spitz auslaufenden Querschnitt aufweist.Short inking unit according to claim 7, characterized in that the pocket (21) has a cross section which tapers in the direction of rotation of the anilox roller (3). Kurzfarbwerk nach einem der vorhergehenden Ansprüche 4 bis 8, dadurch gekennzeichnet, daß die Verteilerkammer (17) im mittleren Bereich des Querschnitts des Rakelhalters (9) vorgesehen ist.Short inking unit according to one of the preceding claims 4 to 8, characterized in that the distributor chamber (17) is provided in the central region of the cross section of the doctor holder (9). Kurzfarbwerk nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Farbkammer (13) über die Zuströmöffnungen (19a) mittels einer Pumpe (16) mit Farbe versorgbar und mittels der Überströmöffnungen (25a) an eine drucklose Rücklaufleitung (26) anschließbar ist.Short inking unit according to one of the preceding claims, characterized in that the ink chamber (13) can be supplied with ink via the inflow openings (19a) by means of a pump (16) and can be connected to a pressure-free return line (26) by means of the overflow openings (25a).
EP91112554A 1987-02-12 1988-01-09 Short inking device Expired - Lifetime EP0458371B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19873704433 DE3704433A1 (en) 1987-02-12 1987-02-12 SHORT COLOR PLANT
DE3704433 1987-02-12
EP88100219A EP0278225B1 (en) 1987-02-12 1988-01-09 Short-inking device

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EP88100219.0 Division 1988-01-09

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EP0458371A1 true EP0458371A1 (en) 1991-11-27
EP0458371B1 EP0458371B1 (en) 1995-04-26

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EP88100219A Expired - Lifetime EP0278225B1 (en) 1987-02-12 1988-01-09 Short-inking device

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US2018193A (en) * 1931-08-27 1935-10-22 Goss Printing Press Co Ltd Inking mechanism and method
DE587039C (en) * 1932-11-25 1933-10-28 Leonhard Horn Ink feed device, especially for rotary printing machines
US2226311A (en) * 1936-10-23 1940-12-24 Firm Schnellpressenfabrik Koen Device for inking in the copper cylinder in intaglio printing
EP0199520A2 (en) * 1985-04-19 1986-10-29 Vickers Plc Gravure printing press and method of manufacturing the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045077A2 (en) 2007-10-02 2009-04-08 Koenig & Bauer Aktiengesellschaft Equipment for inking an screen roller of a rotary printing press
DE102007000812A1 (en) * 2007-10-02 2009-04-09 Koenig & Bauer Aktiengesellschaft Device for inking an ink-transferring roller of a rotary printing machine and a doctor bar
EP2045077A3 (en) * 2007-10-02 2011-11-30 Koenig & Bauer Aktiengesellschaft Equipment for inking an screen roller of a rotary printing press

Also Published As

Publication number Publication date
DE3704433C2 (en) 1989-01-19
DE3879982D1 (en) 1993-05-13
DE3704433A1 (en) 1988-08-25
EP0278225A3 (en) 1990-05-23
EP0278225A2 (en) 1988-08-17
EP0458371B1 (en) 1995-04-26
EP0278225B1 (en) 1993-04-07
DE3853686D1 (en) 1995-06-01
US5058502A (en) 1991-10-22

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