EP1291176B1 - Printing machine and method of operating an inking unit - Google Patents

Printing machine and method of operating an inking unit Download PDF

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Publication number
EP1291176B1
EP1291176B1 EP02016226A EP02016226A EP1291176B1 EP 1291176 B1 EP1291176 B1 EP 1291176B1 EP 02016226 A EP02016226 A EP 02016226A EP 02016226 A EP02016226 A EP 02016226A EP 1291176 B1 EP1291176 B1 EP 1291176B1
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EP
European Patent Office
Prior art keywords
roller
printing
medium
accumulations
screen
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EP02016226A
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German (de)
French (fr)
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EP1291176A3 (en
EP1291176A2 (en
Inventor
Stephen Franklin
Martin John Callahan
Wolfgang Schönberger
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen 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
    • B41F31/004—Driving means for ink rollers

Definitions

  • the invention relates to a printing machine with an inking unit, in particular short inking unit, according to the preamble of claim 1 and a method for operating an inking unit, according to the preamble of claim 6.
  • a known printing machine comprises an inking unit, for example an anilox inking unit, which comprises an anilox roller for metering a printing medium to be transferred to an inking roller cooperating with the anilox roller, for example ink or varnish.
  • the anilox roller has on its circumference a pattern formed from depressions, for example individual wells or lines.
  • the printing medium is transferred from the anilox roller to a printing plate, for example a plate cylinder, and from there to a printing material. Due to the pattern of the anilox roller, the solid surfaces of a printed image applied to the printing material are not closed, but one can see the fine anilox structure, which is not desirable.
  • a further object is to provide a method for operating an inking unit, in which a possible closed solid surface is preferably generated by simple means.
  • a printing machine with the features of claim 1 is proposed. It has an anilox roller, for example an anilox roller, which has a pattern formed from recesses on its circumference.
  • the depressions can be filled with a pressure medium, for example liquid paint or lacquer.
  • the anilox roller is in contact with another roller, for example a color transfer roller, onto which the printing medium located in the recesses is applied.
  • the printing press is characterized in that the anilox roller and the roller are drivingly coupled to one another such that after each revolution of the anilox roller the pattern imaged by the printing medium on the roller in the form of accumulations of printing medium over a previous revolution of the anilox roller on the Roller imaged pattern has such a small offset in the circumferential direction that the new print medium clusters are positioned in the pressure medium-free or substantially pressure-medium-free gap each adjacent pressure medium residual accumulations on the roller.
  • the pressure medium located in the recesses is thus transferred to the roller in the nip formed between the anilox roller and the roller and forms on the peripheral surface of small pressure medium accumulations, which in the circumferential direction of the roller have a pattern corresponding to the wells constant distance from each other.
  • the size of the offset between the fresh print medium accumulation and the print medium residual accumulation is dependent on the distance of the wells provided on the anilox roller to each other. If the anilox roller has, for example, a cell or line pattern, then, for example, up to 50 lines can be provided on one centimeter. The distance between two adjacent lines can be in the range of a few hundredths of a millimeter to a few tens of millimeters.
  • the anilox roll pattern is formed by cells or lines, of which one centimeter can be arranged over 100. It will be appreciated that the offset must be extremely precise so that the new print media clumps are placed exactly in the print media-free or substantially print-medium-free gap of respectively adjacent print media residual clumps on the drum.
  • the anilox roller and the roller are coupled together via a single-stage or multi-stage drive gear.
  • the overall gear ratio "i" of the drive gear is selected and the
  • Diameter d R of the anilox roller and the diameter d W of the roller coordinated so that the peripheral speed difference is zero, so that the anilox roller and roll slip without slip, yet after each revolution of the anilox roller the pattern shown on the roller such a small offset in the circumferential direction, that the new pressure medium accumulations are placed in the virtually pressure medium-free gap of each adjacent pressure medium residual accumulations on the roller.
  • the transmission ratio is 1: 1.999
  • the diameter d W of the roller is 200 mm
  • the diameter d R of the anilox roller is 100.05 mm.
  • the diameter d W of the roller is the same size as the diameter of a plate cylinder in contact with the roller.
  • a method for operating an inking unit with the features of claim 6 is proposed.
  • the method provides that the anilox roller and the roller are rotated in such a way that after each rotation of the anilox roller the pattern imaged by the pressure medium on the roller in the form of accumulations of printing media is imaged relative to a previous one revolution of the anilox roller and the roller Pattern has such a small offset in the circumferential direction that the new print medium clusters are positioned in the pressure medium-free or substantially pressure medium-free gap of each adjacent pressure medium residual accumulations of the roller.
  • the offset can be realized both in the direction of rotation of the rolls or counter to the direction of rotation of the rolls.
  • the printing machine 1 described below is generally applicable. In the following, purely by way of example, it is assumed that it is an offset printing press that is operated in wet offset or dry offset.
  • the printing medium selected for printing a printed image on a printing material for example a sheet or a web of paper, cardboard, plastic or sheet, may be, for example, liquid or pasty paint or lacquer. In the following, it is assumed that this is liquid color.
  • FIG. 1 shows a section of an embodiment of the printing machine 1, namely an inking unit 3, which is formed here by an anilox inking unit.
  • the inking unit 3 comprises an anilox roller 5, which is also referred to as an anilox roller and which is in contact with a roller 7, that is to say the anilox roller 5 and the roller 7 roll off one another.
  • the roller 7 is formed here by an elastic coat having an inking roller, which cooperates with a plate cylinder, not shown in Figure 1.
  • the diameter of the roller 7 is preferably equal to that of the plate cylinder, wherein in this embodiment, the diameter of the anilox roller 5 is half as large as that of the roller. 7
  • recesses 11 are arranged at an equal distance from each other, whereby a pattern is formed.
  • the recesses 11 are formed here as wells, wherein the cell geometry and the cell distribution determine the scoop volume of the anilox roller.
  • the depressions 1 can be filled with ink, wherein a doctor device not shown in FIG. 1, which scrapes off the circumferential surface 9 of the anilox roller 5, ensures that the depression 11 is reproducibly filled with ink and thus always a predetermined ink volume is transferred to the roller 7 ,
  • the anilox roller 5 and the roller 7 are drivable by means of a drive device, not shown in Figure 1, wherein between the anilox roller 5 and roller 7, a small peripheral speed difference is set, that is, there is a slip between the rollers 5, 7, to which in the following even closer will be received.
  • a control device is preferably provided, by means of which the drive device is controlled.
  • color is transferred to the peripheral surface 13 of the roller 7 and forms thereon small color clusters 15 (pressure medium accumulations), seen in the circumferential direction of the roller 7 have a constant distance from one another.
  • the recesses 11 are partially emptied on the anilox roller 5.
  • the color clusters 15 forms on the peripheral surface 13 of the roller 7, the pattern or the structure of the anilox roller 5 from.
  • the color clusters 15 applied to the roller 7 are not completely transferred to the plate cylinder due to the color splitting that takes place, but a part of each of the color clusters 15 remains on the roller 7.
  • These remaining color clusters are hereinafter referred to as color residual clusters 17 (Residual pressure accumulations). 1, the residual color accumulations 17 have a smaller color volume and a lower height than the color clusters 15, since color splitting in each case causes a part of the color clusters 17 to form a color-free gap.
  • Clusters 15 was delivered to the plate cylinder.
  • the Abrollrios the anilox roller 5 and the roller 7 are chosen so that when passing the gaps 19 on the anilox roller 5 in the region of the nip of the anilox roller 5, the new color clusters 15 exactly in the gaps 19 between the color residual accumulations 17 on the Roller 7 are set or transmitted.
  • a color ink film of continuous color is formed, the thickness of which varies only slightly. Due to the continuous coloring can be printed on the substrate a closed solid surface in which the pattern on the anilox roller is not visible. So there are no additional rollers or other means for smearing or spreading of the color accumulations 15 required, as they are used in known printing machines.
  • the previously colorless gaps 19 are provided with color clusters 15, so that a closed color film is formed is, as shown in Figure 1 on the nip downstream part of the peripheral surface 13 of the roller 7. Since, with each revolution of the roller, 7 parts of the color clusters 15 and that of the color residual clusters 17 are transferred to the plate cylinder, finally, only the thickness of the color film fluctuates.
  • FIG. 2 shows a section of another embodiment of the printing machine 1, namely the anilox roller 5 and the roller 7, which are coupled together via a multi-stage drive gear 21.
  • the drive gear 21 is part of the drive means for the rollers 5, 7.
  • the drive gear 21 comprises a first gear stage 23, a second gear stage 25 and a third gear stage 27.
  • the drive gear 21 has a first gear 29 and a second gear 31 which are rotationally fixed are connected to a shaft 33, and a third gear 35 and a fourth gear 37, which are rotatably connected to a shaft 39.
  • the drive device 21 further comprises a fifth gear 41, which is rotatably connected to a bearing pin 43 of the anilox roller 5.
  • the first gear 29 and a gear 75 coupled to the roller 7 constitute the first gear stage 23, the intermeshing gears 33, 35 constitute the second gear stage 25 and the gears 39, 41 the third gear stage 27.
  • the overall gear ratio of the drive gear 21 is chosen so that - as described with reference to Figure 1 - the color clusters 15 are positioned in the gaps 19 between the color residual accumulations 17, the peripheral speeds of the anilox roller 5 and the roller 7 are preferably equal to each other or slightly different.
  • a squeegee device 45 assigned to the anilox roller 5 is also indicated schematically, which may be formed, for example, by a chamber doctor blade.
  • the drive gear is formed in one stage, that is, there are only two gears provided, of which a first gear with the roller 7 and a second gear are coupled to the anilox roller 5, which mesh with each other ,
  • Figure 3 shows a cross section through an embodiment of the printing machine 1 in the area of the inking unit 3. It is here still a formed by a plate cylinder 47 printing plate 49 is shown, which is in contact with the roller 7. Furthermore, a further embodiment of the drive device is shown.
  • the roller 7 is coupled to a main drive 51 of the printing machine 1.
  • a connected to the roller 7 gear 53 and connected to the plate cylinder 47 gear 55 are provided.
  • the gear 55 meshes with the gear 53 and with a gear 57 connected to the main drive 51.
  • the gears 53, 55 at the same speeds, so that the roller 7 and the plate cylinder 47, which have the same diameter, slip without slip together.
  • the anilox roller 5 is coupled to a separate motor 59, so that a desired circumferential speed difference between the anilox roller 5 and the roller 7 can be made by influencing the engine control.
  • the exemplary embodiment of the drive device illustrated in FIG. 3 has the advantage that the peripheral speed difference can be set optimally for any desired pattern of the anilox roller 5. With the help of the separate motor 59 so an extremely small translation can be realized so that the anilox roller 5 per revolution in the circumferential direction, ie in or against its direction of rotation, relative to the roller 7 has an offset, which is preferably a few 10ths of a millimeter or 100ths of a millimeter.
  • Figure 4 shows a section of a further embodiment of the printing machine 1 in side view, in which the anilox roller 5 via gears with the not closer driven main drive of the printing press is driven.
  • the offset of the fresh pressure medium clusters to the pressure medium residual clusters is caused by a superposition gear 61.
  • the plate cylinder, not shown, the roller 7 and the anilox roller 5 are connected to each other via gears in a plane.
  • the superimposed gear 61 is here formed by a planetary gear, which has a gear 63 with internal teeth, a web 65, on which three planetary gears 67 arranged in pairs are rotatably mounted and a rotatably connected to the anilox roller 5 gear 69 comprises.
  • the gear design is chosen so that at conceivable standstill of a motor 71 and consequently with stationary web 65, the anilox roller would rotate twice when the anilox roller 7 has undergone a revolution.
  • the web 65 is rotated so slowly by means of the motor 71, that the total ratio of the superposition gear 61 of the well and line structure of the respective anilox roller 5 is set accordingly and that the coloring of the roller 7 is again such that the color Clusters 15 are positioned in the gap 19 between the color residual clusters 17.
  • the motor 71 needs to rotate the web 65 only very little power and can therefore be made correspondingly small. Further, a high accuracy for adjusting the peripheral speed difference between the anilox roller 5 and roller 7 is easily adjustable, since the motor 71 has a large translation for its slow-running pinion 73, which also duplicates the resolution.
  • the embodiment described with reference to FIG. 4 further has the advantage that, in the event of a failure of the motor 71, it is still possible to continue printing, although not more as desired, because then the peripheral speed difference between the anilox roller 5 and the roller 7 is zero.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
  • Rotary Presses (AREA)
  • Ink Jet (AREA)
  • Screen Printers (AREA)

Abstract

A screen roller (5) consisting of a pattern formed of recesses (11) over its periphery which are filled with a printing medium. The screen roller and the roller (7) with which it is driven are coupled so that, each time the screen roller rotates, the printing medium present in the form of piled-up printing medium (15) is placed into the voids (19) formed by the previous revolution and free of printing medium.

Description

Die Erfindung betrifft eine Druckmaschine mit einem Farbwerk, insbesondere Kurzfarbwerk, gemäß Oberbegriff des Anspruchs 1 und ein Verfahren zum Betreiben eines Farbwerks, gemäß Oberbegriff des Anspruchs 6.The invention relates to a printing machine with an inking unit, in particular short inking unit, according to the preamble of claim 1 and a method for operating an inking unit, according to the preamble of claim 6.

Druckmaschinen und Verfahren der hier angesprochenen Art sind bekannt. Eine bekannte Druckmaschine umfasst ein Farbwerk, beispielsweise ein Anilox-Farbwerk, das eine Rasterwalze zum Dosieren eines auf eine mit der Rasterwalze zusammenwirkende Farbauftragswalze zu übertragenden Druckmediums, beispielsweise Farbe oder Lack, umfasst. Die Rasterwalze weist auf ihrem Umfang ein aus Vertiefungen, beispielsweise einzelne Näpfchen oder Linien, gebildetes Muster auf. Das Druckmedium wird von der Rasterwalze auf eine Druckform, beispielsweise Plattenzylinder, übertragen und von diesem auf einen Bedruckstoff. Aufgrund des Musters der Rasterwalze sind die Volltonflächen eines auf den Bedruckstoff aufgebrachten Druckbilds nicht geschlossen, sondern man kann die feine Rasterwalzenstruktur erkennen, was nicht gewünscht ist.Printing machines and methods of the type discussed here are known. A known printing machine comprises an inking unit, for example an anilox inking unit, which comprises an anilox roller for metering a printing medium to be transferred to an inking roller cooperating with the anilox roller, for example ink or varnish. The anilox roller has on its circumference a pattern formed from depressions, for example individual wells or lines. The printing medium is transferred from the anilox roller to a printing plate, for example a plate cylinder, and from there to a printing material. Due to the pattern of the anilox roller, the solid surfaces of a printed image applied to the printing material are not closed, but one can see the fine anilox structure, which is not desirable.

Um zu verhindern, dass das Muster der Rasterwalze auf dem Druckbild zu erkennen ist, werden beispielsweise zusätzliche Reiterwalzen auf der Farbauftragswalze eingesetzt, die dieses Muster verreiben sollen. Nachteilig ist hier der kostenintensive Aufbau des Druckwerks und dass die zusätzlichen Walzen dazu führen, dass das Farbwerk nicht mehr schablonierfrei ist. Weiterhin ist es bekannt, das Muster auf der Rasterwalze so fein auszubilden, dass es vom Auge eines Betrachters nicht mehr als störend wahrgenommen wird. Mit feiner werdendem Muster nimmt jedoch die übertragbare Farbmenge, also das Schöpfvolumen der Vertiefungen in der Rasterwalze und damit auch die Dichte des auf dem Druckstoff aufgebrachten Druckbilds ab. Folglich gestaltet sich die Reinigung der Rasterwalze sehr schwierig. Ferner ist aus der DE 44 31 464 A1 eine Vorrichtung bekannt, die eine Differenzumfangsgeschwindigkeit zwischen Rasterwalze und Farbauftragswalze ermöglicht, um das Druckmediummuster auf der Farbauftragswalze zu verwischen. Es hat sich jedoch gezeigt, dass der Druckmediumfilm auf der Farbauftragswalze hierdurch nicht in gewünschter Weise vergleichmäßigt werden kann und dass bei Differenzumfangsgeschwindigkeiten größer circa 5 % die Druckmediumdichte einfach abnimmt, während das Muster im Druckbild weiterhin sichtbar bleibt.In order to prevent the pattern of the anilox roller from being visible on the printed image, for example, additional rider rollers are used on the inking roller which are intended to rub this pattern. The disadvantage here is the cost-intensive structure of the printing unit and that the additional rollers cause the inking is no longer stencil-free. Furthermore, it is known to form the pattern on the anilox roller so fine that it is no longer perceived as disturbing by the eye of an observer. As the pattern becomes finer, however, the transferable amount of ink, that is to say the scoop volume of the depressions in the anilox roll and thus also the density of the printed image applied to the printed matter, decreases. As a result, the cleaning of the anilox roller is very difficult. Furthermore, from the DE 44 31 464 A1 a device is known which allows a differential circumferential speed between the anilox roller and inking roller to blur the printing medium pattern on the inking roller. However, it has been found that the printing medium film on the inking roller can not be uniformed in the desired manner and that at Differential peripheral speeds greater than about 5%, the print medium density simply decreases, while the pattern remains visible in the print image.

Es ist Aufgabe der Erfindung eine Druckmaschine der eingangs genannten Art zu schaffen, mit der eine möglichst geschlossene Volltonfläche gedruckt werden kann und die vorzugsweise einen einfachen und kostengünstigen Aufbau aufweist. Ein weiteres Ziel besteht darin, ein Verfahren zum Betreiben eines Farbwerks zu schaffen, bei dem eine möglichst geschlossene Volltonfläche mit vorzugsweise einfachen Mitteln erzeugt wird.It is an object of the invention to provide a printing machine of the type mentioned above, with a closed solid surface as possible can be printed and preferably has a simple and inexpensive construction. A further object is to provide a method for operating an inking unit, in which a possible closed solid surface is preferably generated by simple means.

Zur Lösung der Aufgabe wird eine Druckmaschine mit den Merkmalen des Anspruchs 1 vorgeschlagen. Sie weist eine Rasterwalze auf, beispielsweise eine Anilox-Walze, die auf ihrem Umfang ein aus Vertiefungen gebildetes Muster aufweist. Die Vertiefungen sind mit einem Druckmedium, beispielsweise flüssiger Farbe oder Lack, befüllbar. Die Rasterwalze steht in Kontakt mit einer weiteren Walze, beispielsweise einer Farbübertragungswalze, auf die das in den Vertiefungen befindliche Druckmedium aufgebracht wird. Die Druckmaschine zeichnet sich dadurch aus, dass die Rasterwalze und die Walze antriebsmäßig so miteinander gekoppelt sind, dass nach jeder Umdrehung der Rasterwalze das durch das Druckmedium auf der Walze in Form von Druckmedium-Anhäufungen abgebildete Muster gegenüber einem bei einer vorhergehenden Umdrehung der Rasterwalze auf der Walze abgebildeten Muster einen so geringen Versatz in Umfangsrichtung aufweist, dass die neuen Druckmedium-Anhäufungen in die druckmediumfreie oder im Wesentlichen druckmediumfreie Lücke jeweils benachbarter Druckmedium-Restanhäufungen auf der Walze positionierbar sind. Das in den Vertiefungen befindliche Druckmedium wird also in dem zwischen der Rasterwalze und der Walze gebildeten Walzenspalt auf die Walze übertragen und bildet auf deren Umfangsoberfläche kleine Druckmedium-Anhäufungen, die in Umfangsrichtung der Walze einem dem Muster der Vertiefungen entsprechenden konstanten Abstand zueinander aufweisen. Nachdem im Laufe einer Rotation der Walze ein Teil des aufgehäuften Druckmediums durch Spaltung an eine mit der Walze zusammenwirkende Druckform, beispielsweise einen Plattenzylinder abgegeben wurde, verbleiben in ihrem Volumen und ihrer Höhe verringerte Druckmedium-Restanhäufungen auf der Walze. Zwischen diesen Druckmedium-Restanhäufungen befinden sich praktisch druckmediumfreie Lücken. Die Abrollung der Rasterwalze und der Walze aufeinander ist derart eingestellt, dass, wenn die druckmediumfreien Lücken auf der Walze an der Rasterwalze vorbeibewegt werden, von dieser die nächsten, frischen Druckmedium-Anhäufungen genau in diese Lücken zwischen dem Druckmedium-Restanhäufungen auf die Walze gesetzt werden. Um die Lücken zwischen den Druckmedium-Anhäufungen mit Druckmedium zu versehen, werden - anders als bei bekannten Verfahren - diese also nicht verwischt, sondern es erfolgt ein kontrolliertes Auffüllen der praktisch druckmediumfreien Lücken zwischen den Druckmedium-Restanhäufungen auf der Walze mit frischen Druckmedium-Anhäufungen. Dadurch wird auf der Walze ein Druckmediumoberflächenrelief erzeugt, dessen Druckmediumschichtdicke vergleichsweise nur geringfügig schwankt, wodurch die Druckqualität erhöht und eine durchgehende Einfärbung einer gedruckten Volltonfläche realisierbar ist. Das durch die Vertiefungen auf der Rasterwalze gebildete Muster ist also auf dem auf einem Bedruckstoff aufgebrachten Druckbild nicht zu erkennen.To solve the problem, a printing machine with the features of claim 1 is proposed. It has an anilox roller, for example an anilox roller, which has a pattern formed from recesses on its circumference. The depressions can be filled with a pressure medium, for example liquid paint or lacquer. The anilox roller is in contact with another roller, for example a color transfer roller, onto which the printing medium located in the recesses is applied. The printing press is characterized in that the anilox roller and the roller are drivingly coupled to one another such that after each revolution of the anilox roller the pattern imaged by the printing medium on the roller in the form of accumulations of printing medium over a previous revolution of the anilox roller on the Roller imaged pattern has such a small offset in the circumferential direction that the new print medium clusters are positioned in the pressure medium-free or substantially pressure-medium-free gap each adjacent pressure medium residual accumulations on the roller. The pressure medium located in the recesses is thus transferred to the roller in the nip formed between the anilox roller and the roller and forms on the peripheral surface of small pressure medium accumulations, which in the circumferential direction of the roller have a pattern corresponding to the wells constant distance from each other. After a portion of the accumulated pressure medium has been released by cleavage to a co-operating with the roller printing plate, such as a plate cylinder in the course of rotation of the roller, remain in their volume and height reduced pressure medium Restanhäufungen on the roller. There are virtually no pressure medium gaps between these residual pressure accumulations. The Unwinding of the anilox roller and the roller is adjusted to one another such that as the print medium-free gaps on the roller are moved past the anilox roller, the next fresh fresh medium accumulations are placed exactly in these gaps between the print medium residual accumulations on the roller. In order to provide the gaps between the print medium accumulations with printing medium, they are not blurred - unlike in known methods - but there is a controlled filling of virtually pressure medium-free gaps between the pressure medium Restanhäufungen on the roller with fresh pressure medium accumulations. As a result, a printing medium surface relief is produced on the roller whose printing medium layer thickness varies only comparatively only slightly, whereby the print quality is increased and a continuous coloring of a printed solid surface can be realized. The pattern formed by the depressions on the anilox roll can therefore not be recognized on the printed image applied to a printing substrate.

Die Größe des Versatzes zwischen der frischen Druckmedium-Anhäufung und der Druckmedium-Restanhäufung ist abhängig vom Abstand der auf der Rasterwalze vorgesehenen Vertiefungen zueinander. Weist die Rasterwalze beispielsweise ein Näpfchen- oder Linienmuster auf, so können zum Beispiel auf einem Zentimeter bis zu 50 Linien vorgesehen sein. Der Abstand zwischen zwei benachbarten Linien kann hier im Bereich von einigen 100stel Millimeter bis einige wenige 10tel Millimeter liegen.The size of the offset between the fresh print medium accumulation and the print medium residual accumulation is dependent on the distance of the wells provided on the anilox roller to each other. If the anilox roller has, for example, a cell or line pattern, then, for example, up to 50 lines can be provided on one centimeter. The distance between two adjacent lines can be in the range of a few hundredths of a millimeter to a few tens of millimeters.

Bei einer ebenfalls geeigneten Rasterwalzengravur ist das Rasterwalzenmuster durch Näpfchen oder Linien gebildet, von denen auf einem Zentimeter über 100 angeordnet sein können. Es wird deutlich, dass der Versatz äußerst präzise sein muss, damit die neuen Druckmedium-Anhäufungen genau in die druckmediumfreie oder im Wesentlichen druckmediumfreie Lücke jeweils benachbarter Druckmedium-Restanhäufungen auf der Walze gesetzt werden.In a likewise suitable anilox engraving, the anilox roll pattern is formed by cells or lines, of which one centimeter can be arranged over 100. It will be appreciated that the offset must be extremely precise so that the new print media clumps are placed exactly in the print media-free or substantially print-medium-free gap of respectively adjacent print media residual clumps on the drum.

Bei einem vorteilhaften Ausführungsbeispiel der Druckmaschine ist vorgesehen, dass die Rasterwalze und die Walze über ein einstufiges oder mehrstufiges Antriebsgetriebe miteinander gekoppelt sind. Bei einer besonders vorteilhaften Ausführungsvariante ist das Gesamtübersetzungsverhältnis "i" des Antriebsgetriebes so gewählt und derIn an advantageous embodiment of the printing machine is provided that the anilox roller and the roller are coupled together via a single-stage or multi-stage drive gear. In a particularly advantageous embodiment, the overall gear ratio "i" of the drive gear is selected and the

Durchmesser dR der Rasterwalze und der Durchmesser dW der Walze so aufeinander abgestimmt, dass die Umfangsgeschwindigkeitsdifferenz Null ist, dass also die Rasterwalze und die Walze schlupffrei aneinander abrollen, wobei dennoch nach jeder Umdrehung der Rasterwalze das auf der Walze abgebildete Muster einen so geringen Versatz in Umfangsrichtung aufweist, dass die neuen Druckmedium-Anhäufungen in die praktisch druckmediumfreie Lücke jeweils benachbarter Druckmedium-Restanhäufungen auf der Walze gesetzt werden. Dies wird beispielsweise dadurch realisiert, dass das Übersetzungsverhältnis 1:1,999, der Durchmesser dW der Walze 200 mm und der Durchmesser dR der Rasterwalze 100,05 mm betragen. Vorzugsweise ist der Durchmesser dW der Walze gleich groß wie der Durchmesser eines mit der Walze in Kontakt stehenden Plattenzylinders.Diameter d R of the anilox roller and the diameter d W of the roller coordinated so that the peripheral speed difference is zero, so that the anilox roller and roll slip without slip, yet after each revolution of the anilox roller the pattern shown on the roller such a small offset in the circumferential direction, that the new pressure medium accumulations are placed in the virtually pressure medium-free gap of each adjacent pressure medium residual accumulations on the roller. This is realized, for example, in that the transmission ratio is 1: 1.999, the diameter d W of the roller is 200 mm, and the diameter d R of the anilox roller is 100.05 mm. Preferably, the diameter d W of the roller is the same size as the diameter of a plate cylinder in contact with the roller.

Weitere vorteilhafte Ausführungsformen ergeben sich aus den übrigen UnteransprüchenFurther advantageous embodiments will be apparent from the remaining dependent claims

Zur Lösung der Aufgabe wird auch ein Verfahren zum Betreiben eines Farbwerks mit den Merkmalen des Anspruchs 6 vorgeschlagen. Das Verfahren sieht vor, dass die Rasterwalze und die Walze so aufeinander abgestimmt rotiert werden, dass nach jeder Umdrehung der Rasterwalze das durch das Druckmedium auf der Walze in Form von Druckmedium-Anhäufungen abgebildete Muster gegenüber einem bei einer vorhergehenden Umdrehung der Rasterwalze und der Walze abgebildeten Muster einen so geringen Versatz in Umfangsrichtung aufweist, dass die neuen Druckmedium-Anhäufungen in die druckmediumfreie oder im Wesentlichen druckmediumfreie Lücke jeweils benachbarter Druckmedium-Restanhäufungen der Walze positioniert werden. Der Versatz kann sowohl in Drehrichtung der Walzen oder entgegen der Drehrichtung der Walzen realisiert sein.To achieve the object, a method for operating an inking unit with the features of claim 6 is proposed. The method provides that the anilox roller and the roller are rotated in such a way that after each rotation of the anilox roller the pattern imaged by the pressure medium on the roller in the form of accumulations of printing media is imaged relative to a previous one revolution of the anilox roller and the roller Pattern has such a small offset in the circumferential direction that the new print medium clusters are positioned in the pressure medium-free or substantially pressure medium-free gap of each adjacent pressure medium residual accumulations of the roller. The offset can be realized both in the direction of rotation of the rolls or counter to the direction of rotation of the rolls.

Die Erfindung wird im Folgenden anhand der Zeichnung näher erläutert. Es zeigen:

Figur 1
einen Ausschnitt aus einem Ausführungsbeispiel einer Druckmaschine, nämlich zwei aneinander abrollende Walzen,
Figur 2
ein Ausführungsbeispiel eines mehrstufigen Antriebsgetriebes für Walzen der Druckmaschine in Seitenansicht,
Figur 3
ein weiteres Ausführungsbeispiel einer Antriebseinrichtung für Walzen der Druckmaschine mit Blick in Maschinenlaufrichtung und
Figur 4
ein drittes Ausführungsbeispiel der Antriebseinrichtung für Walzen in Seitenansicht.
The invention will be explained in more detail below with reference to the drawing. Show it:
FIG. 1
a detail of an embodiment of a printing press, namely two rolls rolling against each other,
FIG. 2
an embodiment of a multi-stage drive gear for rolls of the printing press in side view,
FIG. 3
a further embodiment of a drive device for rolls of the printing machine with a view in the machine direction and
FIG. 4
a third embodiment of the drive device for rollers in side view.

Die im Folgenden beschriebene Druckmaschine 1 ist allgemein einsetzbar. Im Folgenden wird rein beispielhaft davon ausgegangen, dass es sich um eine Offset-Druckmaschine handelt, die im Nassoffset oder Trockenoffset betrieben wird. Das zum Drucken eines Druckbildes auf einen Bedruckstoff, beispielsweise ein Bogen oder eine Bahn aus Papier, Karton, Kunststoff oder Blech, gewählte Druckmedium kann beispielsweise flüssige oder pastöse Farbe oder Lack sein. Im Folgenden wird davon ausgegangen, dass es sich hier um flüssige Farbe handelt.The printing machine 1 described below is generally applicable. In the following, purely by way of example, it is assumed that it is an offset printing press that is operated in wet offset or dry offset. The printing medium selected for printing a printed image on a printing material, for example a sheet or a web of paper, cardboard, plastic or sheet, may be, for example, liquid or pasty paint or lacquer. In the following, it is assumed that this is liquid color.

Figur 1 zeigt einen Ausschnitt eines Ausführungsbeispiel der Druckmaschine 1, nämlich ein Farbwerk 3, das hier von einem Anilox-Farbwerk gebildet ist. Das Farbwerk 3 umfasst eine auch als Anilox-Walze bezeichnete Rasterwalze 5, die mit einer Walze 7 in Kontakt steht, das heißt die Rasterwalze 5 und die Walze 7 rollen aneinander ab. Die Walze 7 ist hier von einer einen elastischen Mantel aufweisenden Farbauftragswalze gebildet, die mit einem in Figur 1 nicht dargestellten Plattenzylinder zusammenwirkt. Der Durchmesser der Walze 7 ist vorzugsweise gleich groß wie der des Plattenzylinders, wobei bei diesem Ausführungsbeispiel der Durchmesser der Rasterwalze 5 halb so groß ist wie der der Walze 7.Figure 1 shows a section of an embodiment of the printing machine 1, namely an inking unit 3, which is formed here by an anilox inking unit. The inking unit 3 comprises an anilox roller 5, which is also referred to as an anilox roller and which is in contact with a roller 7, that is to say the anilox roller 5 and the roller 7 roll off one another. The roller 7 is formed here by an elastic coat having an inking roller, which cooperates with a plate cylinder, not shown in Figure 1. The diameter of the roller 7 is preferably equal to that of the plate cylinder, wherein in this embodiment, the diameter of the anilox roller 5 is half as large as that of the roller. 7

In der Umfangsfläche 9 der Rasterwalze 5 sind in einem gleichen Abstand zueinander angeordnete Vertiefungen 11 vorgesehen, wodurch ein Muster gebildet wird. Die Vertiefungen 11 sind hier als Näpfchen ausgebildet, wobei die Näpfchengeometrie und die Näpfchenverteilung das Schöpfvolumen der Rasterwalze bestimmen. Die Vertiefungen 1 sind mit Farbe befüllbar, wobei eine in Figur 1 nicht dargestellte Rakeleinrichtung, die die Umfangsfläche 9 der Rasterwalze 5 abrakelt, dafür sorgt, dass die Vertiefung 11 reproduzierbar mit Farbe gefüllt werden und somit immer ein vorgegebenes Farbvolumen auf die Walze 7 übertragen wird.In the circumferential surface 9 of the anilox roller 5 recesses 11 are arranged at an equal distance from each other, whereby a pattern is formed. The recesses 11 are formed here as wells, wherein the cell geometry and the cell distribution determine the scoop volume of the anilox roller. The depressions 1 can be filled with ink, wherein a doctor device not shown in FIG. 1, which scrapes off the circumferential surface 9 of the anilox roller 5, ensures that the depression 11 is reproducibly filled with ink and thus always a predetermined ink volume is transferred to the roller 7 ,

Die Rasterwalze 5 und die Walze 7 sind mittels einer in Figur 1 nicht dargestellten Antriebseinrichtung antreibbar, wobei zwischen Rasterwalze 5 und Walze 7 eine kleine Umfangsgeschwindigkeitsdifferenz eingestellt ist, das heißt, es besteht ein Schlupf zwischen den Walzen 5, 7, worauf im Folgenden noch näher eingegangen wird. Zur Einstellung einer gewünschten Umfangsgeschwindigkeitsdifferenz ist vorzugsweise eine nicht dargestellte Steuereinrichtung vorgesehen, mittels derer die Antriebseinrichtung gesteuert wird.The anilox roller 5 and the roller 7 are drivable by means of a drive device, not shown in Figure 1, wherein between the anilox roller 5 and roller 7, a small peripheral speed difference is set, that is, there is a slip between the rollers 5, 7, to which in the following even closer will be received. To set a desired peripheral speed difference, a control device, not shown, is preferably provided, by means of which the drive device is controlled.

Aus den Vertiefungen 11 der Rasterwalze 5 wird Farbe auf die Umfangsfläche 13 der Walze 7 übertragen und bildet darauf kleine Farb-Anhäufungen 15 (Druckmedium-Anhäufungen), die -in Umfangsrichtung der Walze 7 gesehen- einen konstanten Abstand zueinander aufweisen. Dabei werden die Vertiefungen 11 auf der Rasterwalze 5 teilweise entleert. Durch die Farb-Anhäufungen 15 bildet sich auf der Umfangsfläche 13 der Walze 7 das Muster beziehungsweise die Struktur der Rasterwalze 5 ab. Die auf die Walze 7 aufgebrachten Farb-Anhäufungen 15 werden aufgrund der stattfindenden Farbspaltung nicht vollständig auf den Plattenzylinder übertragen, sondern ein Teil jedes der Farb-Anhäufungen 15 verbleibt auf der Walze 7. Diese verbleibenden Farb-Haufen werden im Folgenden als Farb-Restanhäufüngen 17 (Druckmedium-Restanhäufungen) bezeichnet. Zwischen jeweils benachbarten Farb-Restanhäufungen 17 befindet sich eine farbfreie Lücke 19. Wie aus Figur 1 ersichtlich, weisen die Farb-Restanhäufungen 17 ein geringeres Farbvolumen und eine geringere Höhe als die Farb-Anhäufungen 15 auf, da durch Farbspaltung jeweils ein Teil der Farb-Anhäufungen 15 an den Plattenzylinder abgegeben wurde.From the recesses 11 of the anilox roller 5 color is transferred to the peripheral surface 13 of the roller 7 and forms thereon small color clusters 15 (pressure medium accumulations), seen in the circumferential direction of the roller 7 have a constant distance from one another. The recesses 11 are partially emptied on the anilox roller 5. By the color clusters 15 forms on the peripheral surface 13 of the roller 7, the pattern or the structure of the anilox roller 5 from. The color clusters 15 applied to the roller 7 are not completely transferred to the plate cylinder due to the color splitting that takes place, but a part of each of the color clusters 15 remains on the roller 7. These remaining color clusters are hereinafter referred to as color residual clusters 17 (Residual pressure accumulations). 1, the residual color accumulations 17 have a smaller color volume and a lower height than the color clusters 15, since color splitting in each case causes a part of the color clusters 17 to form a color-free gap. Clusters 15 was delivered to the plate cylinder.

Die Abrollverhältnisse der Rasterwalze 5 und der Walze 7 sind so gewählt, dass beim Vorbeibewegen der Lücken 19 an der Rasterwalze 5 im Bereich des Walzenspalts von der Rasterwalze 5 die neuen Farb-Anhäufungen 15 genau in die Lücken 19 zwischen den Farb-Restanhäufungen 17 auf die Walze 7 gesetzt beziehungsweise übertragen werden. Dadurch wird auf der Umfangsfläche 13 der Walze 7 ein durchgehend eingefärbter Farbfilm gebildet, dessen Dicke nur geringfügig schwankt. Aufgrund der durchgehenden Einfärbung kann auf dem Bedruckstoff eine geschlossene Volltonfläche gedruckt werden, bei dem das Muster auf der Rasterwalze nicht erkennbar ist. Hierzu sind also keine zusätzlichen Walzen oder sonstige Einrichtungen zum Verwischen oder Verstreichen der Farb-Anhäufungen 15 erforderlich, wie sie bei bekannten Druckmaschinen eingesetzt werden.The Abrollverhältnisse the anilox roller 5 and the roller 7 are chosen so that when passing the gaps 19 on the anilox roller 5 in the region of the nip of the anilox roller 5, the new color clusters 15 exactly in the gaps 19 between the color residual accumulations 17 on the Roller 7 are set or transmitted. As a result, on the peripheral surface 13 of the roller 7, a color ink film of continuous color is formed, the thickness of which varies only slightly. Due to the continuous coloring can be printed on the substrate a closed solid surface in which the pattern on the anilox roller is not visible. So there are no additional rollers or other means for smearing or spreading of the color accumulations 15 required, as they are used in known printing machines.

Eine vollständig druckmediumfreie Lücke 19 zwischen benachbarten Farb-Restanhäufungen 17 besteht letztlich nur nach einer ersten Umdrehung der Walze 7. Nachdem die Lücken 19 den Walzenspalt passiert haben, sind die zuvor farbfreien Lücken 19 mit Farb-Anhäufungen 15 versehen, so dass ein geschlossener Farbfilm gebildet ist, wie er in Figur 1 auf dem dem Walzenspalt nachgeordneten Teil der Umfangsfläche 13 der Walze 7 dargestellt ist. Da bei jeder Umdrehung der Walze 7 Teile der Farb-Anhäufungen 15 und der der Farb-Restanhäufungen 17 an den Plattenzylinder übertragen werden, schwankt schließlich nur noch die Dicke des Farbfilms.A completely pressure-medium-free gap 19 between adjacent color residue accumulations 17 ultimately exists only after a first revolution of the roller 7. After the gaps 19 have passed the nip, the previously colorless gaps 19 are provided with color clusters 15, so that a closed color film is formed is, as shown in Figure 1 on the nip downstream part of the peripheral surface 13 of the roller 7. Since, with each revolution of the roller, 7 parts of the color clusters 15 and that of the color residual clusters 17 are transferred to the plate cylinder, finally, only the thickness of the color film fluctuates.

Figur 2 zeigt einen Ausschnitt eines weiteren Ausführungsbeispiels der Druckmaschine 1, nämlich die Rasterwalze 5 und die Walze 7, die über ein mehrstufiges Antriebsgetriebe 21 miteinander gekoppelt sind. Das Antriebsgetriebe 21 ist Teil der Antriebseinrichtung für die Walzen 5, 7. Das Antriebsgetriebe 21 umfasst eine erste Getriebestufe 23, eine zweite Getriebestufe 25 und eine dritte Getriebestufe 27. Das Antriebsgetriebe 21 weist ein erstes Zahnrad 29 und ein zweites Zahnrad 31 auf, die drehfest mit einer Welle 33 verbunden sind, sowie ein drittes Zahnrad 35 und ein viertes Zahnrad 37, die mit einer Welle 39 drehfest verbunden sind. Die Antriebseinrichtung 21 umfasst ferner ein fünftes Zahnrad 41, das drehfest mit einem Lagerzapfen 43 der Rasterwalze 5 verbunden ist. Das erste Zahnrad 29 und ein mit der Walze 7 gekoppeltes Zahnrad 75 bilden die erste Getriebestufe 23, die kämmend miteinander in Eingriff stehenden Zahnräder 33, 35 bilden die zweite Getriebestufe 25 und die Zahnräder 39, 41 die dritte Getriebestufe 27. Das Gesamtübersetzungsverhältnis des Antriebsgetriebes 21 ist so gewählt, dass - wie anhand von Figur 1 beschrieben - die Farb-Anhäufungen 15 in die Lücken 19 zwischen den Farb-Restanhäufungen 17 positioniert werden, wobei die Umfangsgeschwindigkeiten der Rasterwalze 5 und der Walze 7 zueinander vorzugsweise gleich sind oder geringfügig voneinander abweichen.Figure 2 shows a section of another embodiment of the printing machine 1, namely the anilox roller 5 and the roller 7, which are coupled together via a multi-stage drive gear 21. The drive gear 21 is part of the drive means for the rollers 5, 7. The drive gear 21 comprises a first gear stage 23, a second gear stage 25 and a third gear stage 27. The drive gear 21 has a first gear 29 and a second gear 31 which are rotationally fixed are connected to a shaft 33, and a third gear 35 and a fourth gear 37, which are rotatably connected to a shaft 39. The drive device 21 further comprises a fifth gear 41, which is rotatably connected to a bearing pin 43 of the anilox roller 5. The first gear 29 and a gear 75 coupled to the roller 7 constitute the first gear stage 23, the intermeshing gears 33, 35 constitute the second gear stage 25 and the gears 39, 41 the third gear stage 27. The overall gear ratio of the drive gear 21 is chosen so that - as described with reference to Figure 1 - the color clusters 15 are positioned in the gaps 19 between the color residual accumulations 17, the peripheral speeds of the anilox roller 5 and the roller 7 are preferably equal to each other or slightly different.

In Figur 2 ist ferner in schematischer Darstellung eine der Rasterwalze 5 zugeordnete Rakeleinrichtung 45 angedeutet, die beispielsweise von einer Kammerrakel gebildet sein kann.In FIG. 2, a squeegee device 45 assigned to the anilox roller 5 is also indicated schematically, which may be formed, for example, by a chamber doctor blade.

Bei einem in den Figuren nicht dargestellten Ausführungsbeispiel ist das Antriebsgetriebe einstufig ausgebildet, das heißt, es sind lediglich zwei Zahnräder vorgesehen, von denen ein erstes Zahnrad mit der Walze 7 und ein zweites Zahnrad mit der Rasterwalze 5 gekoppelt sind, die miteinander kämmend in Eingriff stehen.In one embodiment, not shown in the figures, the drive gear is formed in one stage, that is, there are only two gears provided, of which a first gear with the roller 7 and a second gear are coupled to the anilox roller 5, which mesh with each other ,

Figur 3 zeigt einen Querschnitt durch ein Ausführungsbeispiel der Druckmaschine 1 im Bereich des Farbwerks 3. Es ist hier noch eine von einem Plattenzylinder 47 gebildete Druckform 49 dargestellt, die mit der Walze 7 in Kontakt steht. Ferner ist ein weiteres Ausführungsbeispiel der Antriebseinrichtung dargestellt. Die Walze 7 ist mit einem Hauptantrieb 51 der Druckmaschine 1 gekoppelt. Hierfür sind ein mit der Walze 7 verbundenes Zahnrad 53 und ein mit dem Plattenzylinder 47 verbundenes Zahnrad 55 vorgesehen. Das Zahnrad 55 steht mit dem Zahnrad 53 und mit einem mit dem Hauptantrieb 51 verbundenen Zahnrad 57 kämmend in Eingriff. Bei diesem Ausführungsbeispiel weisen die Zahnräder 53, 55 gleiche Drehzahlen auf, so dass die Walze 7 und der Plattenzylinder 47, die gleiche Durchmesser aufweisen, schlupffrei aneinander abrollen. Die Rasterwalze 5 ist mit einem separaten Motor 59 gekoppelt, so dass eine gewünschte Umfangsgeschwindigkeitsdifferenz zwischen der Rasterwalze 5 und der Walze 7 durch eine Beeinflussung der Motorsteuerung vorgenommen werden kann. Das in Figur 3 dargestellte Ausführungsbeispiel der Antriebseinrichtung weist den Vorteil auf, dass die Umfangsgeschwindigkeitsdifferenz für jedes beliebige Muster der Rasterwalze 5 optimal eingestellt werden kann. Mit Hilfe des separaten Motors 59 kann also eine extrem kleine Übersetzung realisiert werden, so dass die Rasterwalze 5 pro Umdrehung in Umfangsrichtung, also in oder entgegen ihrer Drehrichtung, gegenüber der Walze 7 einen Versatz aufweist, der vorzugsweise wenige 10tel Millimeter oder 100stel Millimeter beträgt.Figure 3 shows a cross section through an embodiment of the printing machine 1 in the area of the inking unit 3. It is here still a formed by a plate cylinder 47 printing plate 49 is shown, which is in contact with the roller 7. Furthermore, a further embodiment of the drive device is shown. The roller 7 is coupled to a main drive 51 of the printing machine 1. For this purpose, a connected to the roller 7 gear 53 and connected to the plate cylinder 47 gear 55 are provided. The gear 55 meshes with the gear 53 and with a gear 57 connected to the main drive 51. In this embodiment, the gears 53, 55 at the same speeds, so that the roller 7 and the plate cylinder 47, which have the same diameter, slip without slip together. The anilox roller 5 is coupled to a separate motor 59, so that a desired circumferential speed difference between the anilox roller 5 and the roller 7 can be made by influencing the engine control. The exemplary embodiment of the drive device illustrated in FIG. 3 has the advantage that the peripheral speed difference can be set optimally for any desired pattern of the anilox roller 5. With the help of the separate motor 59 so an extremely small translation can be realized so that the anilox roller 5 per revolution in the circumferential direction, ie in or against its direction of rotation, relative to the roller 7 has an offset, which is preferably a few 10ths of a millimeter or 100ths of a millimeter.

Figur 4 zeigt einen Ausschnitt eines weiteren Ausführungsbeispiels der Druckmaschine 1 in Seitenansicht, bei dem die Rasterwalze 5 auch über Zahnräder mit dem hier nicht näher dargestellten Hauptantrieb der Druckmaschine angetrieben wird. Der Versatz der frischen Druckmedium-Anhäufungen zu den Druckmedium-Restanhäufungen wird durch ein Überlagerungsgetriebe 61 hervorgerufen. Bei diesem Ausführungsbeispiel sind der nicht dargestellte Plattenzylinder, die Walze 7 und die Rasterwalze 5 über Zahnräder in einer Ebene miteinander verbunden. Das Überlagerungsgetriebe 61 ist hier von einem Planetengetriebe gebildet, das ein Zahnrad 63 mit Innenverzahnung, einen Steg 65, auf dem drei paarweise angeordnete Planetenräder 67 drehbeweglich angeordnet sind sowie ein drehfest mit der Rasterwalze 5 verbundenes Zahnrad 69, umfasst. Die Zahnradauslegung ist hier so gewählt, dass bei denkbarem Stillstand eines Motors 71 und demzufolge bei stillstehendem Steg 65 die Rasterwalze sich zweimal drehen würde, wenn die Rasterwalze 7 eine Umdrehung durchlaufen hat. Im Betrieb wird mittels des Motors 71 der Steg 65 so langsam verdreht, dass die Gesamt-Übersetzung des Überlagerungsgetriebes 61 der Näpfchen- und Linienstruktur der jeweils verwendeten Rasterwalze 5 entsprechend eingestellt wird und dass die Einfärbung der Walze 7 wieder dergestalt ist, dass die Farb-Anhäufungen 15 in die Lücke 19 zwischen den Farb-Restanhäufungen 17 positioniert werden.Figure 4 shows a section of a further embodiment of the printing machine 1 in side view, in which the anilox roller 5 via gears with the not closer driven main drive of the printing press is driven. The offset of the fresh pressure medium clusters to the pressure medium residual clusters is caused by a superposition gear 61. In this embodiment, the plate cylinder, not shown, the roller 7 and the anilox roller 5 are connected to each other via gears in a plane. The superimposed gear 61 is here formed by a planetary gear, which has a gear 63 with internal teeth, a web 65, on which three planetary gears 67 arranged in pairs are rotatably mounted and a rotatably connected to the anilox roller 5 gear 69 comprises. The gear design is chosen so that at conceivable standstill of a motor 71 and consequently with stationary web 65, the anilox roller would rotate twice when the anilox roller 7 has undergone a revolution. In operation, the web 65 is rotated so slowly by means of the motor 71, that the total ratio of the superposition gear 61 of the well and line structure of the respective anilox roller 5 is set accordingly and that the coloring of the roller 7 is again such that the color Clusters 15 are positioned in the gap 19 between the color residual clusters 17.

Der Motor 71 braucht zum Verdrehen des Steges 65 nur sehr wenig Leistung und kann daher entsprechend klein ausgebildet sein. Ferner ist eine hohe Genauigkeit zur Einstellung der Umfangsgeschwindigkeitsdifferenz zwischen Rasterwalze 5 und Walze 7 leicht einstellbar, da der Motor 71 eine große Übersetzung für sein langsam laufendes Ritzel 73 hat, womit sich auch die Auflösung vervielfältigt. Die anhand der Figur 4 beschriebene Ausführungsform weist ferner den Vorteil auf, dass bei einem Ausfall des Motors 71 immer noch weitergedruckt werden kann, wenn auch nicht mehr wie gewünscht, da dann die Umfangsgeschwindigkeitsdifferenz zwischen Rasterwalze 5 und Walze 7 Null ist.The motor 71 needs to rotate the web 65 only very little power and can therefore be made correspondingly small. Further, a high accuracy for adjusting the peripheral speed difference between the anilox roller 5 and roller 7 is easily adjustable, since the motor 71 has a large translation for its slow-running pinion 73, which also duplicates the resolution. The embodiment described with reference to FIG. 4 further has the advantage that, in the event of a failure of the motor 71, it is still possible to continue printing, although not more as desired, because then the peripheral speed difference between the anilox roller 5 and the roller 7 is zero.

Alternativ zu dem anhand der Figur 4 beschriebenen Überlagerungsgetriebe 61 können selbstverständlich auch andere Möglichkeiten zur Erzeugung einer sehr kleinen, exakt einstellbaren Umfangsgeschwindigkeitsdifferenz zwischen Rasterwalze 5 und Walze 7 eingesetzt werden.As an alternative to the superposition gearing 61 described with reference to FIG. 4, other possibilities for producing a very small, exactly adjustable peripheral speed difference between the anilox roller 5 and the roller 7 can of course also be used.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Druckmaschinepress
22
33
Farbwerkinking
44
55
Rasterwalzeanilox roller
66
77
Walzeroller
88th
99
Umfangsflächeperipheral surface
1010
1111
Vertiefungenwells
1212
1313
Umfangsflächeperipheral surface
1414
1515
Farb-AnhäufungenColor Pilings
1616
1717
Farb-RestanhäufungenColor residual accumulations
1818
1919
farbfreie Lückecolorless gap
2020
2121
Antriebsgetriebedrive gear
2222
2323
erste Getriebestufefirst gear stage
2424
2525
zweite Getriebestufesecond gear stage
2626
2727
dritte Getriebestufethird gear stage
2828
2929
erstes Zahnradfirst gear
3030
3131
zweites Zahnradsecond gear
3232
3333
Wellewave
3434
3535
drittes Zahnradthird gear
3636
3737
viertes Zahnradfourth gear
3838
3939
Wellewave
4040
4141
fünftes Zahnradfifth gear
4242
4343
Lagerzapfenpivot
4444
4545
Rakeleinrichtungdoctor device
4646
4747
Plattenzylinderplate cylinder
4848
4949
Druckformprinting form
5050
5151
Hauptantriebmain drive
5252
5353
Zahnradgear
5454
5555
Zahnradgear
5656
5757
Zahnradgear
5858
5959
Motorengine
6060
6161
ÜberlagerungsgetriebeSuperposition gear
6262
6363
Zahnradgear
6464
6565
Stegweb
6666
6767
Planetenräderplanetary gears
6868
6969
Zahnradgear
7070
7171
Motorengine
7272
7373
Ritzelpinion
7474
7575
Zahnradgear

Claims (6)

  1. Printing press (1) including an inking unit (3), in particular a short inking unit, with a screen roller (5) that has a circumference formed with a pattern of depressions (11) and cooperates with a roller (7), the depressions (11) being fillable with a print medium, and with a drive device,
    characterized in
    that the screen roller (5) and the roller (7) have a drive connection with one another in such a way that after each revolution of the screen roller (5), the pattern depicted by the printing medium on the roller (7) in the form of printing medium accumulations (15) has a slight offset in the circumferential direction with respect to a pattern depicted on the roller (7) during a preceding revolution of the screen roller (5) so that the new printing medium accumulations (15) can be positioned on the roller (5) in the printing-medium free gaps or approximately printing-medium free gaps (19) of respective adjacent residual accumulations of printing medium (17) on the roller (7).
  2. Printing press according to claim 1,
    characterized in
    that the screen roller (5) and the roller (7) are coupled by a one-stage or multi-stage drive gear transmission (21).
  3. Printing press according to claim 1,
    characterized in
    that the roller (7) is coupled to a main drive (51) of the printing press (1) and the screen roller (5) is coupled to a separate motor (59).
  4. Printing press according to claim 1,
    characterized in
    that the screen roller (5) and the roller (7) are connected by a variable-ratio gear transmission (61).
  5. Printing press according to one of the preceding claims,
    characterized in
    that the roller (7) is driven at machine speed and that a differential circumferential speed between screen roller (5) and roller (7) is adjustable by increasing or decreasing the circumferential speed of the screen roller.
  6. Method of operating an inking unit (3), in particular a short inking unit, including a screen roller (5) that cooperates with a roller (7) and has a circumference formed with a pattern of depressions (11) fillable with a printing medium,
    characterized in
    that the screen roller (5) and the roller (7) are rotated in a coordinated way such that after each revolution of the screen roller (5), the pattern depicted by the printing medium on the roller (7) in the form of printing medium accumulations (15) has a slight offset in the circumferential direction with respect to a pattern depicted on the roller (7) during a preceding revolution of the screen roller (5) so that the new printing medium accumulations (15) can be positioned on the roller (5) in the printing-medium free gap or approximately printing-medium free gap (19) of respective adjacent residual accumulations of printing medium (17) on the roller (7).
EP02016226A 2001-09-11 2002-07-19 Printing machine and method of operating an inking unit Expired - Lifetime EP1291176B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10144563A DE10144563A1 (en) 2001-09-11 2001-09-11 Printing press and method for operating an inking unit
DE10144563 2001-09-11

Publications (3)

Publication Number Publication Date
EP1291176A2 EP1291176A2 (en) 2003-03-12
EP1291176A3 EP1291176A3 (en) 2004-01-07
EP1291176B1 true EP1291176B1 (en) 2007-08-15

Family

ID=7698527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02016226A Expired - Lifetime EP1291176B1 (en) 2001-09-11 2002-07-19 Printing machine and method of operating an inking unit

Country Status (8)

Country Link
US (1) US6745689B2 (en)
EP (1) EP1291176B1 (en)
JP (1) JP2003094607A (en)
CN (1) CN1330484C (en)
AT (1) ATE369982T1 (en)
CZ (1) CZ20022279A3 (en)
DE (2) DE10144563A1 (en)
HK (1) HK1054530A1 (en)

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EP3170665A1 (en) 2015-11-20 2017-05-24 Heidelberger Druckmaschinen AG Method for operating a printing press having an anilox roller

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US8423374B2 (en) * 2002-06-27 2013-04-16 Siebel Systems, Inc. Method and system for processing intelligence information
DE102005025742B4 (en) * 2004-07-07 2016-07-28 Heidelberger Druckmaschinen Ag Method for controlling a short inking unit of a printing press
JP2006250202A (en) * 2005-03-09 2006-09-21 Komori Corp Rotary drive transmission device for roller
CN1853929B (en) * 2005-04-29 2011-05-18 海德堡印刷机械股份公司 Printing press and method for operating the same
DE102006015577B4 (en) * 2005-04-29 2014-06-05 Heidelberger Druckmaschinen Ag Printing machine and method for its operation
DE102008062027B4 (en) * 2008-01-31 2018-05-17 Heidelberger Druckmaschinen Ag Printing machine with an anilox inking unit with associated washing device
DE102011100284A1 (en) * 2010-05-27 2011-12-01 Heidelberger Druckmaschinen Ag Device for dosing e.g. paint, on raster roll of offset printing machine, has filling elements arranged against respective wall side surface and at outer side of container, where side surface is turned away from coating fluid

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DE102015222908A1 (en) 2015-11-20 2017-06-08 Heidelberger Druckmaschinen Ag Method for operating a printing machine

Also Published As

Publication number Publication date
JP2003094607A (en) 2003-04-03
CN1406752A (en) 2003-04-02
EP1291176A3 (en) 2004-01-07
HK1054530A1 (en) 2003-12-05
US6745689B2 (en) 2004-06-08
ATE369982T1 (en) 2007-09-15
US20030047096A1 (en) 2003-03-13
CN1330484C (en) 2007-08-08
DE10144563A1 (en) 2003-03-27
DE50210683D1 (en) 2007-09-27
EP1291176A2 (en) 2003-03-12
CZ20022279A3 (en) 2003-04-16

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