EP1707360A2 - Pump inking unit of a printing press having a plurality of dosing pumps - Google Patents

Abstract

The machine has a printing unit (5) and a waterless flat printing form (4), where a color deck (8) is arranged at the flat printing form. The color deck is designed as pump inking systems with several dosing pumps (9). The dosing pumps are arranged next to each other in an axial direction of an inking roller. A filter is arranged on a path that is provided from a color reservoir to the dosing pumps.

Description

The invention relates to a printing press with at least one printing unit according to the preamble of claim 1.

By the WO 03/045694 A1 and the WO 03/045695 A1 Methods are known in which by tempering a cooperating with a printing ink rotating component of a printing unit a tack of the ink on the rotating component in a temperature range of 22 ° C to 50 ° C is kept substantially constant, the speed of the ink from the temperature on the lateral surface of the rotating component and its production speed depends. The application consists in particular in a waterless printing unit, preferably in a printing unit for newspaper printing.

By the WO 01/87036 A2 a short inking unit of a rotary printing machine is known, wherein in the inking unit an anilox roller pasty printing inks, in particular with a viscosity greater than 9000 mPa * s, processing is arranged, wherein a grid of the anilox roller to a grid of a printing plate of a rotary printing machine arranged in a form cylinder in a ratio of 0 , 5, in particular greater than 0.8.

In Pumpfarbwerken in contrast to conventional film inking the ink quantity to be entered into the inking unit is not made via color meter, but via an exact dosage by means of valves and / or pumps. This is done, for example, tailor-made for each individual color zone. For cost and / or space reasons, a supply of a certain pressure levels for several in the axial direction juxtaposed ink zones is sometimes provided, the dosage, for example, per Falbzone or color zone group individually adjustable by valves are.

Fig. 7 shows schematically a Pumpfarbwerk, each to be supplied color zone or color zone group a pump, here a Schrägachsen- (double) piston pump is provided. These pumps are supplied via a supply line from a paint reservoir and deliver via lines (hoses) the pumped ink to a corresponding metering opening of the applicator. In the axial direction, a plurality of such openings, feeders and tubes are provided. The pumps are arranged for reasons of space away from the applicator, which is disadvantageous in terms of long supply routes, material and lack of compactness. The Falbe is metered through the opening by means of the pump on a roller of the inking unit, for. B duct roller, applied.

By the DE 698 09 580 T2 a pumping inking unit of a printing press is known, wherein a certain amount of ink can be metered by means of a plurality of metering pumps on axially adjacent regions of a roll shell surface by a discharge opening, and wherein several of the metering pumps are arranged side by side in an application strip in the axial direction of the inking roller. The metering pumps are designed as gear pumps or other suitable positive displacement pumps.

The DE 26 26 006 A1 disclosed rotatory displacement pumps designed as a sickle-wheel pump designed with a externally toothed inner rotor and an internally toothed outer rotor, whose axes of rotation are mounted eccentrically to each other. To form a suction and a pressure chamber a sickle-shaped insert is provided in the intersection space.

In the DE 20 43 078 is disclosed a Pumpfarbwerk, which in an embodiment side by side a plurality of pumps, in particular gear pumps, between a common feed line and a respective bore of a manifold block.

By brochure material of the company. HNP Microsystems GmbH, Parchim, a metering pump is designed as a rotary positive displacement pump with an externally toothed inner rotor and an internally toothed outer rotor whose axes of rotation are mounted eccentrically to each other, wherein the outer and inner rotor have a cycloid-shaped teeth, which with their cycloid-shaped teeth in meshing engagement and during rotation at any one time forming a system of multiple sealed delivery chambers.

The invention has for its object to provide a printing machine with at least one printing unit.

The object is achieved by the features of claim 1.

The achievable with a Pumpfarbwerk over a conventional film inking advantages show up in a simpler basic setting, commissioning and / or color curve determination. An influence of changes in the basic settings such as film roll spacing, bending of the ductor, etc., is lower. Improvements can be achieved in the resolution of the setting steps, in particular in the area of small areal coverage.

In contrast to single or double piston pumps, the use of gerotor pumps, in particular rotary displacement pumps with externally toothed internal rotor and internal toothed external rotor, makes it possible to achieve significantly more uniform conveyance (low pulsation, small dead volume).

Because of the small installation space, a separate pump can now be provided per color zone directly on the applicator strip - in particular in the axial direction next to one another.

Another advantage of the invention according to a preferred development is that properties of the printing ink used and the printing forme arranged on a forme cylinder are coordinated with one another in such a way that a good printing result is obtained in a waterless printing process (for example by means of a waterless planographic printing plate), in particular in the "dry offset". Particularly in newspaper printing, printing qualities can be produced in this way that far exceed the qualities of conventionally produced printed products, in particular in color brilliance.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

eine schematische Darstellung einer für den Mehrfarbendruck geeigneten Druckmaschine mit vier Druckeinheiten jeweils mit zwei Druckwerken und jeweils einem einzügigen Walzenfarbwerk;

Fig. 2

eine schematische Darstellung eines Druckwerks der Druckmaschine gemäß Fig. 1 mit einem Farbwerk, in vergrößerter Darstellung;

Fig. 3

eine schematische Darstellung eines Formzylinders mit Druckformen;

Fig. 4

eine halbschematische perspektivische Darstellung der beiden Formzylinder und Übertragungszylinder einer der Druckeinheiten der Druckmaschine gemäß Fig. 1;

Fig. 5

eine alternative Ausbildung der Druckmaschine gemäß Fig. 1 mit zweizügigen Walzenfarbwerken;

Fig. 6

eines der zweizügigen Walzenfarbwerke gemäß Fig. 5 in vergrößerter Darstellung;

Fig. 7

ein Pumpfarbwerk gemäß Stand der Technik;

Fig. 8

das Funktionsprinzip a), b); c) und d) der Dosierpumpe nach der Erfindung;

Fig. 9

eine Konzeption des Pumpfarbwerks;

Fig. 10

eine erste Ausführungsvariante des Pumpfarbwerks;

Fig. 11

eine zweite Ausführungsvariante des Pumpfarbwerks;

Fig. 12

eine schwenkbare Ausführung gemäß Fig. 11, angestellt;

Fig. 13

eine schwenkbare Ausführung gemäß Fig. 11, abgestellt;

Fig. 14

eine räumliche Darstellung der Baugruppe "Pumpe";

Fig. 15

eine schematische Darstellung der Baueinheit aus Pumpeinheit, Dichtung und Antriebswelle;

Fig. 16

eine tabellarische Charakterisierung einer vorteilhaften Dimensionierung der Dosierpumpe.

Show it:

Fig. 1

a schematic representation of a suitable for multi-color printing press with four printing units each with two printing units and each einwirkigen roller inking unit;

Fig. 2

a schematic representation of a printing unit of the printing machine of Figure 1 with an inking, in an enlarged view.

Fig. 3

a schematic representation of a forme cylinder with printing plates;

Fig. 4

a semi-schematic perspective view of the two form cylinder and transfer cylinder of the printing units of the printing machine of FIG. 1;

Fig. 5

an alternative embodiment of the printing machine of Figure 1 with zweizügigen roller inking;

Fig. 6

one of the zweizügigen roller inking unit of FIG. 5 in an enlarged Presentation;

Fig. 7

a pumping paint according to the prior art;

Fig. 8

the functional principle a), b); c) and d) of the metering pump according to the invention;

Fig. 9

a conception of the pump paint;

Fig. 10

a first embodiment of the pump paint;

Fig. 11

a second embodiment of the pump paint;

Fig. 12

a pivotable embodiment of FIG 11, employed;

Fig. 13

a pivotable embodiment of FIG. 11, parked;

Fig. 14

a spatial representation of the assembly "pump";

Fig. 15

a schematic representation of the assembly of pump unit, seal and drive shaft;

Fig. 16

a tabular characterization of an advantageous dimensioning of the metering pump.

Reference is first made to FIGS. 1 and 2. Fig. 1 shows a greatly simplified form schematically a printing press 01, z. B is a newspaper printing machine 01, preferably a printing machine printing several different inks, with a frame 02 and z. B four vertically superimposed printing units, wherein a substrate 03, z. B a material web 03, in particular a paper web 03, in the vertical direction, the printing units passes successively. A production flow of the printing substrate 03 passing through the printing machine 01 is essentially assumed from the bottom to the top in this example.

In the example shown in FIG. 1 are in each printing unit on both sides of the paper web 03 for the perfecting one printing unit 05 with an ink transferring cylinder 06, z. B transfer cylinder 06 and a rolling on the transfer cylinder 06, "double-sized", printing plates 04-bearing cylinder 07, z. B form cylinder 07 is arranged. By "doubly large" is meant a scope which essentially corresponds to two printed pages, in particular newspaper pages in broadsheet format, one behind the other. The two transfer cylinders 06 and the two forme cylinders 07 of two opposing printing units 05 are arranged so that their axes of rotation lie in a plane which is inclined relative to the paper web 03 by preferably 75 ° to 88 °. The arrangement of these cylinders 06, 07 in a plane has the advantage that during operation fewer disturbances due to vibrations of these cylinders 06; 07 occur, which is particularly important in the waterless systems in question here, which are sensitive to changes in distance particularly sensitive to interference.

FIG. 2 furthermore shows a feed device 55 for feeding a printing forme 04 to the forme cylinder 07. The printing forme 04 can be mounted largely automatically on the lateral surface of the forme cylinder 07.

Each of at least one transfer cylinder 06 and a forme 07 existing printing unit 05 is associated with an inking unit 08, wherein each inking unit 08, which is formed in the case of the illustrated embodiment as einzughiges roller inking unit 08, at least one ink supply 09, namely the below even more detail descriptive metering pump device 09 includes.

The printing units 05 and inking units 08 are designed here for the "dry offset" or "waterless offset printing", i. the execution of printing unit 05 and inking unit 08 is such that no dampening solution and thus no dampening unit is provided.

As can be seen in particular from FIG. 2, each inking unit 08 comprises (at least) two application rollers 12 applying the ink to the printing plates 04 fastened on the forme cylinder 07, eg. B inking rollers 12 which the color of a printing form near rubbing roller 13 and distribution cylinder 13 (eg hard surface), a color or transfer roller 14 (eg, with a soft surface), a printing unit remote rubbing roller 15 and distribution cylinder 15, another color or transfer roller 16 (eg, with a soft surface), a film roll 17 and a ductor roller 18 from the Dosierpumpeneinrichtung 09 receives. To even out the color distribution, the two distribution cylinders 13; 15 in the axial direction iridescent, i. movably driven. Furthermore, the distribution cylinder 13; 15 together or individually by a separate, from the cylinders 06; 07 independent drive motor driven by rotation. Also for the ductor roller 18 and possibly also for the film roller 17, a separate rotary drive is preferably provided. The traversing movement of the distribution cylinder 13; 15 can be done with increased demand for variability, jointly or individually, by a suitable drive means or, as provided here with reduced effort, by a rotational movement in an axial movement converting gear.

Instead of the one-off roller inking unit 08 described above and shown in FIGS. 1 and 2, which can be used especially in newspaper printing, a two-stroke inking unit 20, z. B zweizügiges roll inking 20 find use, as shown for example in FIGS. 5 and 6. Incidentally, in this case, the printing press has the same structure as that described with reference to FIG. 1, so that reference can be made to this extent to this extent.

Each two-color inking unit 20 comprises at least three, here four the color on the Printing form 04 application rollers 21, z. B inking rollers 21, which the color over a first Farbzug with a first Reibwalze 22 or distribution cylinder 22, a soft ink or transfer roller 23 and a hard transfer roller 24, and a second ink draw with a second Reibwalze 25 and Reibzylinder 25 of a common soft ink or transfer roller 26 forth, a form cylinder remote friction roller 27 and distribution cylinder 27, another soft ink roller 28; a film roll 29 and a ductor roll 30 from the Dosierpumpeneinrichtung 09 receives. Preferably, the three distribution cylinders 22; 25; 27, jointly or individually, by its own, of the cylinders 06; 07 independent drive motor driven by rotation. Also for the ductor roller 30 is preferably, and optionally also provided for the film roller 29, a separate rotary drive. The traversing movement of the distribution cylinder 22; 25; 27 can be made with increased demand for variability, jointly or individually, by a suitable drive means or, as provided here with reduced effort, by a rotational movement in an axial movement converting gear. Such an inking unit 20 is preferably provided in the configuration of the printing unit for commercial printing, but may also be used for the newspaper printing.

In the exemplary representation of Figs. 1 and 5, the both sides of the paper web 03 arranged transfer cylinder 06 are employed in a so-called rubber-rubber arrangement against each other, so that the mutually employed transfer cylinder 06 mutually act as a counter-pressure cylinder. Alternatively, printing units 05 can be combined to a satellite printing unit, wherein the printing units 05 to a common of the other cylinders 06; 07 separate impression cylinder are arranged, wherein the paper web 03 is guided in each case between at least one employee employed to the impression cylinder transfer cylinder 06 and the impression cylinder.

Another alternative to the design of the printing machine 01 may provide that the Printing machine 01 z. B is formed as a commercial press with a preferably substantially horizontal guidance of the printing material 03, wherein in the printing machine 01 along the printing machine 01 continuous production flow of the printing material 03 preferably on both sides, ie below and above the printing material 03, several successive printing units 05 are provided , wherein the transfer cylinder 06 of two printing units 05 turn z. B are employed in a rubber-rubber arrangement against each other, wherein the substrate 03 is passed between the two mutually employed transfer cylinders 06, ie the substrate 03 passes through the mutual Abrollbereich. As an alternative to the material web 03, the printing material 03 may also be formed as a sheet 03.

The ink transfer cylinder 06 are, as already mentioned, as operating in a dry offset printing transfer cylinder 06, wherein the transfer cylinder 06 preferably have an elastic surface, wherein the elastic surface z. B by at least one arranged on the lateral surface of the transfer cylinder 06 printing blanket 10, z. B blanket 10 is formed of an elastomeric material.

The transfer cylinders 06 associated with the forme cylinder 07 have on their lateral surface in each case at least one printing forme 04, (in particular designed as a printing plate), cf. 2 and 3. Each printing forme 04 is designed in particular as a planographic printing plate 04 suitable for a waterless planographic printing process ("dry offset"), so that it is not necessary to supply a dampening solution for the formation of non-printing areas. The forme cylinders 07 are preferably provided with a plurality of printing plates 04 in their axial direction X and / or in their circumferential direction Y (FIG. 3). In the case of the embodiment of a newspaper printing press (newspaper pages in broadsheet format) shown here, the forme cylinders 07 are in each case in the axial direction X, z. B with six printing plates 04 and in its circumferential direction Y occupied by two printing plates 04, so that then on each plate cylinder 07 twelve printing plates 04 are arranged. In Fig. 3 is a development of such a plate cylinder 07 is shown schematically with twelve printing plates 04, wherein the printing plates 04 are shown only half in the illustrated view and the belonging to FIG. 3, perpendicular to each other direction arrows X; Y indicating the forme cylinder 07 axial direction X and the circumferential direction Y of the forme cylinder 07.

Fig. 4 shows a perspective view of the two forme cylinder 07 and the two transfer cylinder 06 of the press machine 01 opposite Pushers 05. The transfer cylinder 06 are each occupied by three axially adjacent rubber blankets 10, which are each rotated by 180 °. The forme cylinders 07 are each occupied by six planographic printing plates 04 arranged side by side in the axial direction, with two planographic printing plates 04 being arranged one behind the other in the circumferential direction.

To produce a printed image on the printing substrate 03, each printing plate 04 has at least one printed image spot. For this purpose, according to several alternatives, it may be provided that the printing plates 04 have several print image positions in the axial direction X and / or in the circumferential direction Y of the forme cylinder 07 (see FIG. Instead of a forme cylinder 07 in its axial direction X z. B six printing plates 04 and in the circumferential direction Y z. B provide two printing plates 04, the form cylinder 07 can each z. Be occupied with only a single printing plate 04 04, this printing plate 04 in the forme cylinder 07 axial direction X z. B six print image locations and / or in the circumferential direction Y of the forme cylinder 07 z. B has two print image locations. Also, each printing plate 04 may each have only a single printed image point.

The printing units 05 arranged downstream of one another on the same side of the printing material 03 in the production flow preferably print ink with mutually different shades. For example, in each printing unit, there are 05 color dots one of the colors used in four-color printing, black, cyan, magenta and yellow. On the forme cylinder 07 of the successive printing units 05 are correlated with the same print image print image locations, each forming a color separation of the multicolored print image to be generated, each color separation is assigned to one of the colors to be printed. A multicolored print image is generated by the fact that on the substrate 03 more color separations, z. B the color tones black, cyan, magenta and yellow respectively four color separations, are printed one above the other, the color dots of each color image concerned the same color separations on the substrate 03 are arranged side by side or one above the other, so that the multicolor printed image by a color mixture of the various Color separations resulting color dots. A color separation representing print image points to produce a common print image are printed in the production flow of the printing substrate 03 successively arranged printing units 05 with their respective from the forme cylinder 07 printing ink transferring cylinders 06 precisely over each other.

In waterless offset printing z. B is a silicone layer on the lateral surface of the printing plate 04, the role of assignable with dampening hydrophilic range of the "wet offset" to prevent the printing plate 04 at a color pickup. Generally, the non-printing areas and the printing areas of the printing form 04 are achieved by the formation of areas of different surface tensions when interacting with the printing ink. Therefore, in waterless offset printing processes, inks are used whose properties differ from those used in conventional "wet offset" printing.

In order to print tone-free, ie without ink acceptance at non-printing areas, it requires a printing ink, which is adjusted in terms of tack (measured as tack value) so that due to the surface tension difference between the printing and non-printing areas on the printing plate 04 a proper separation can take place. Because the Non-printing areas are preferably formed as a silicone layer, a printing ink with a compared to the "wet offset" significantly higher tack is needed for this purpose.

According to the textbook "The web offset printing", Walenski 1995, the tack represents the resistance with which the ink counteracts the film splitting in a nip or during the transfer of the ink in the print zone between the ink transferring cylinder 06 and the substrate 03. The tack of printing inks, d. H. their tack value, z. B according to the standard ISO 12634: 1996 (E). For determining the tack value, there are test devices, in particular testing devices designed as a roller system, so-called "tack meters", e.g. B the test facilities "Inkomat" and "Tackomat" Fa. Prüfbau in D-82380 Peissenberg-Munich, available. Tack values depend on the test equipment used and are given as dimensionless numerical values. Printing ink manufacturers usually indicate the tack value of an ink in conjunction with the underlying test conditions, eg. B with which test device the tack value was determined and at which speed or surface speed of the measuring roller. Typical data relate to speeds of 400, 800 or 1,200 revolutions per minute or measurements with a surface speed of the measuring roller of about 100 meters per minute to 300 meters per minute, in particular 100 or 200 meters per minute. During the test, the ink is heated to preferably 27 ° C or 32 ° C and kept constant at this temperature. Printing inks show i. d. R. with increasing surface speed increasing tack values. With the already mentioned above test device "Inkomat" for example, the test at z. B. 27 ° C, z. B. paint application 1 ml, z. B. Verreibezeit 15 sec., Z. B. Measurement time 4 min., Z. B. Measuring speed 100 m / min.

Since the tack of the printing ink changes with temperature, during the operation of the printing press 01, the forme cylinders 07 are preferably cooled and / or on one constant temperature to avoid toning under changing operating conditions during printing. Such a temperature control is preferably also in the case of the distribution cylinder 13; 15; 22; 25; 27 of the inking 08 or 20 provided. The temperature of the forme cylinder 07 and the distribution cylinder 13; 15; 22; 25; 27 is preferably carried out from the inside by means of a suitable fluid, esp. A suitable liquid, for. B by a flowable temperature control, z. B water, the distribution cylinder 13; 15; 22; 25; 27 or the forme cylinder 07 flows through the jacket surface. With the temperature, the lateral surface of the distribution cylinder 13; 15; 22; 25; 27, for example, held in the temperature range between 22 ° C and 40 ° C and the lateral surface of the forme cylinder 07 in the temperature range z. B between 20 ° C and 30 ° C. The distribution cylinder 13; 15; 22; 25; 27 and / or the forme cylinder 07 have z. B has an axial length of 500 mm to 1,700 mm, in particular 1,200 mm to 1,300 mm, in six plate-width machines between 1,800 mm and 2,500 mm.

The tack of the ink influenced in addition to the separation of printing and non-printing areas, but also the strength of a plucking in the interaction of a color-leading transfer cylinder 06 with the substrate 03. Especially when the substrate 03 as uncoated, low-density newsprint with very good absorbency, ie open-pore and with very low impact time is carried out, increases the risk of loosening caused by fibers or dust. This danger is but z. B also for used in web offset printing lightly coated or lightweight, coated paper grades with a coating weight of z. B up to 20 g / m ² , in particular between 5 and 10 g / m ² or even less before, where the line weight per area unit on a raw substrate, especially on a base paper, ie a paper without surface coating, applied coating mass. Overall, the temperature is particularly suitable for uncoated or coated papers with a coating weight of less than 20 g / m ² . For coated papers, the tempering may be advantageous if it is determined that the stroke is due to increasing tackiness of the paper (at least in part) "deducted" is.

In order to minimize picking or buildup on the blanket 10 and the printing form 04, it is attempted to produce and use the ink for its intended use and the expected operating conditions as close as possible to the lower limit of tack.

With regard to the toning or clogging of the non-printing areas on the printing plate 04, in addition to the tack of the printing ink, the relative speed during the detachment process, that is to say the speed of the inking, is also significant. H. when splitting or loosening the ink, a crucial role. The ink produced at higher production speed v (Figure 1, corresponds to the surface or unwinding speed v of the printing cylinder 06 or the conveying speed of the printing material 03, measured eg in m / s) in the gap both between the inking roller 12, 21st and the printing forme 04 of the forme cylinder 07 as well as between the printing forme 04 of the forme cylinder 07 and the blanket 10 on the transfer cylinder 07 greater tear-off forces. The lower the relative speed, z. B is the intended production speed v, the higher the tack of the ink to choose to prevent toning at lower production speeds v. Otherwise, the wrong choice leads to poor print quality or during the startup processes to an increased amount of paper waste and a high maintenance.

Increases the speed with increasing production speed v, so there is usually a stronger plucking on the substrate 03 and increased build up of pollution and ink on the printing plate 04. This has complications and increased maintenance frequency result, for. B Frequent washing of the surfaces when the tack was designed for a lower or middle range of production speed v.

The tack value of printing inks used in waterless offset printing is z. B in the range between 2 and 16, which is to strive for a trouble-free printing, the tack value to values z. B to stabilize between 6 and 9.5, in particular between 7 and 8.5. Ideally, the tack value is constant in the entire range of the production speed v of 1 m / s to 16 m / s and in the entire range of the relevant for the printing process temperature of 15 ° C to 50 ° C, preferably from 25 ° C to 35 ° C. , Because with a reduction of the tack occurs in the "clay" reinforced toning, magnification in a range "pluck - Build" an increased picking and increased buildup on the cylinders 06; 07 on. In practice, for the "dry offset" a printing ink is to be used, which in the entire range for the production speed v of 1 m / s to 16 m / s, in particular 3 m / s to 16 m / s, and / or in the entire range for the temperature of 15 ° C to 50 ° C, in particular between 22 ° C and 40 ° C, a tack value of 4 does not fall below 12 and does not exceed. Ideally, the tack value for the range of a production speed v of 3 m / s to 16 m / s or a temperature of 22 ° C to 40 ° C, preferably of 27 ° C, in a range of 6 to 9.5, especially between 7 and 8.5.

The viscosity of the printing ink is also a decisive influencing factor for the print quality. The viscosity of the ink is z. B according to the standard ISO 12644: 1996 (E). Their value can be z. B according to the above standard with a bar viscometer or z. B with the measuring method according to Höppler be determined with a falling ball viscometer. The viscosity is a highly dependent on the temperature variable. As the temperature increases, printing inks show a significant drop in their viscosity in the temperature range between 15 ° C and 50 ° C, in particular between 22 ° C and 40 ° C, which is relevant for the printing process. The value of the viscosity for suitable printing inks in the temperature range between 22 ° C and 40 ° C, preferably of 27 ° C, below 350 Pa * s, in particular between 10 Pa * s and 150 Pa * s.

The printing form 04 used, in particular planographic printing plate 04, is to be adapted to the printing method and / or to the printing ink used. The printing form 04 has raster lines (not shown), wherein the raster lines z. B between 50 and 120 lines per centimeter. When using a low-viscosity ink, the printing plate 04 can have raster lines with a screen frequency between 50 and 70 lines per centimeter, preferably 60 lines per centimeter, whereas when using a tendency to higher viscosity ink, the grid lines are formed with a screen frequency between 80 and 120 lines per centimeter , The grid lines may have a depth between 20 microns and 200 microns and z. B by laser, e.g. be introduced by means of a CO2 laser.

In the following, the inking of the printing ink on the ink or ductor rollers 18; 30 of the inking units 08; 20 explained in more detail by means of the metering pump device 09:

The promotion and / or dosage of the color in the pumping 08; 20 trained inking units 08; 20 takes place by means of metering pumps, which is based on the Mikrozahnringprinzip, in particular by means of rotary displacement pumps with externally toothed rotor 31, z. B inner rotor 31 and internally toothed rotor 32, z. B outer rotor 32, which are slightly eccentric to each other. During the rotation of the rotors 31; 32 about their offset axes of rotation 33; 34, z. B axes 33; 34 enlarge the delivery chambers 35 on the suction side, while simultaneously shrinking on the pressure side (kidney-shaped shown in Fig. 8). Between the inlet and outlet opening 36; 37 results in a uniform and almost pulsation-free flow. Outer and inner rotor 32; 31 are in meshing engagement with their cycloid-shaped teeth and form a system of multiple sealed delivery chambers 35 during rotation at all times. The number of teeth of internal and external teeth are different. During the rotation of the rotors 31; 32 about their offset axes 33; 34, the delivery chambers 35 enlarge on the suction side, while at the same time shrinking on the pressure side, as this is shown schematically on a hatched filled delivery chamber 35 in Fig. 8 a) to d).

Fig. 9 shows the conception of the pumping ink 08; 20, wherein from a color reservoir 40, z. B a reservoir 40 of a central ink supply, color by means of a pump 50 and a compressor 50 is conveyed to the applicator 38. To order bar 38 (per printing unit 05) preferably only a supply line 39, z. B lead 39 lead. In the supply line 39 is preferably a pressure regulator 41, z. B, a pressure reducer 41, arranged through which independent of the form a behind-lying pressure P ₀ in the flow 39 to the metering pump 42 is adjustable. Preferably, the pressure P _{0 is set} to at least 2 bar (over ambient), in particular to 3 to 5 bar in the flow 39. In addition, in an advantageous embodiment, a filter 43 can be arranged on the path of the ink from the ink reservoir 40 to the metering pump 42.

At or in the application strip 38 then several (in particular one of the number of axially adjacent zones corresponding number of) metering pumps 42 are provided, which are supplied together via the flow 39. For this purpose, the applicator bar 38 in an advantageous embodiment, an axially extending "suburb reservoir" 44, z. B in the form of over one, two or more pressure sides reaching, transverse tube 44 (Farbzuführleiste 48), with the appropriate number of lines leading to the respective metering pumps 42 45 have (Fig. 10). All metering pumps 42 have their own motor 46 and are individually controllable.

The reference numeral 60 designates a controller for the motor 46, which is preferably designed as a stepping motor 46, wherein the control of the stepper motors 46 and therefore of the metering pump device 09 via the control station is possible.

The motors 46 are controllable so that their rotor is movable in each case in a predetermined rotation angle.

In Fig. 10 and 11, two variants for the spatial arrangement of the metering pump 42 (with motor 46 and the motor 46 with the metering pump 42 connecting coupling 47) are shown. FIG. 11 additionally shows a pressure oil supply 49 for a sealing seal.

Likewise indicated are lines or channels 51 leading from the ink feed bar 48 to an inlet of the metering pump 42 and from an outlet opening thereof to the discharge opening. A cross section in the region of the inlet and / or outlet into or out of the metering pump 42 (and preferably the Channels 51) should be due to the high viscosity z. B. at least 10 mm ² , in particular at least 15 mm ² . In particular, at a maximum operationally required volume flow V _max (eg 10,000 or 15,000 mm ³ ), a minimum cross-sectional area Q should be chosen such that Q ≥ 1 / (1,000 mm) * V _max . This should preferably apply to the entire supply path between Farbzuführleiste 48 to (kidney-shaped) inlet opening 36 and / or from the (kidney-shaped) outlet opening 37 to the discharge opening.

Figs. 12 and 13 show the pumping inking unit 08; 20 in the embodiment substantially according to FIG. 11, the device being movable, in particular pivotable, in the printing unit 05 or inking unit 08; 20 is mounted and abuts in its functional position on a stop 52 and can be clamped by means of a clamping lever 53 in its operating position.

14 shows the assembly with a region 54 containing the pump unit (above-mentioned micro ring pump), a region 56 containing the sealing seal, a coupling 57 which possibly compensates for angle deviations and / or misalignment and a region 58 containing the motor 46. The motor 46 is preferably as a stepping motor 46, z. B with a resolution of at least 100, in particular between 200 and 400 steps per revolution executed. So can an extremely low flow rate at sufficient accuracy can be achieved.

In Fig. 15 as a unit 59, the pump unit (with externally toothed inner rotor and innenverzahntem outer rotor), the drive shaft 61 and a sealing seal 62 is shown. In order to prevent paint containing pigments from escaping from the pump chamber along the drive shaft 61, the barrier seal 62 is provided with two seals 63 (eg Teflon) surrounding the drive shaft 61 and an intermediate pressure chamber 64 in which pressurized oil is held. If the seal does not completely seal off, then at most a small amount of oil will flow towards the pump chamber.

In Fig. 16 advantageous features for design and / or operation of the metering pump 42 are shown. Of particular importance in this case is a width of less than 50 mm, in particular 35 to 43 mm, in the axial direction (FIG. 8) of the inking unit 08; 20. Thus, a kind of "array" of juxtaposed metering pumps 42 per zone (corresponding to the individual color meter in conventional film inking units) is possible. A range of 0.001 l / h to 1,000 l / h or even 1,500 l / h ensures a particularly reliable supply for the smallest (eg 1%) to the largest area coverage (eg 100%) in the printed image - and this in the range of Production speeds from 4,000 U / h to z. B 40,000 U / h of the printing plate 04-bearing cylinder 07. The paint pump is a requirement that they in the entire above-mentioned control range, the flow rate to z. B controls exactly 1%. This is made possible by one or more of the abovementioned measures (above-mentioned cross sections and / or use of an above-mentioned stepping motor 46 and / or short paths due to the possible arrangement of the pump on the application strip 38 and / or formation of the pumping unit as above-mentioned micro-toothed ring pump).

LIST OF REFERENCE NUMBERS

01

Printing press, newspaper printing machine

02

frame

03

Substrate, web, paper web, sheet

04

Printing form, planographic printing form

05

printing unit

06

Cylinder, transfer cylinder

07

Cylinder, forme cylinder

08

Inking unit, roller inking unit, single-entry, pump inking unit

09

Ink supply, dosing pump device

10

Blanket, blanket

11

anilox roller

12

Application roller, inking roller

13

Rubbing roller, distribution cylinder

14

Paint roller, transfer roller

15

Rubbing roller, distribution cylinder

16

Paint roller, transfer roller

17

film roller

18

Ductor roller, ink roller

19

axis

20

Inking unit, roller inking unit, two-part, pump inking unit

21

Application roller, inking roller

22

Reibwale, distribution cylinder

23

Paint roller, transfer roller

24

transfer roller

25

Rubbing roller, distribution cylinder

26

Paint roller, transfer roller

27

Rubbing roller, distribution cylinder

28

ink roller

29

film roller

30

Ductor roller, ink roller

31

Rotor, inner rotor (31)

32

Rotor, outer rotor (32)

33

Rotation axis, axis

34

Rotation axis, axis

35

delivery chamber

36

inlet port

37

outlet

38

applicator strip

39

Supply pipe, flow

40

Paint reservoir, storage tank

41

Pressure regulator, pressure reducer

42

metering

43

filter

44

Suburb reservoir, pipe

45

management

46

Motor, stepper motor

47

clutch

48

ink supply

49

Oil supply

50

Pump, compressor

51

Pipe, sewer

52

attack

53

clamping lever

54

Area

55

feeder

56

Area

57

clutch

58

Area

59

unit

60

control

61

drive shaft

62

barrier seal

63

poetry

64

pressure chamber

v

production speed

X

Directional arrow in the axial direction

Y

Directional arrow in the circumferential direction

P _o

print

Claims (47)

Printing machine (01) having at least one printing unit (05) with at least one waterless planographic printing plate (04) and an inking unit (08) assigned to the printing unit (05), characterized in that the inking unit (08; 20) is in the form of a pumping inking unit (08; 20). is formed with a plurality of metering pumps (42). Printing machine (01) according to claim 1, characterized in that a plurality of the metering pumps (42) in the axial direction of the inking roller (18; 30) side by side on or on a dispensing openings having applicator strip (38) are arranged. Printing machine (01) according to claim 1, characterized in that each metering pump (42) is designed as a rotary displacement pump with an externally toothed inner rotor (31) and an internally toothed outer rotor (32) whose axes of rotation (33; 34) are mounted eccentrically to each other. Printing machine (01) according to claim 1, characterized in that at a maximum operationally required volume flow V _max a minimum cross-sectional area Q for an inlet and / or outlet of the metering pump (42) is selected such that: Q ≥ 1 / (1.000 mm) * V _max . Printing machine (01) according to claim 1, characterized in that one of the rotors (31; 32) of the metering pump (42), in particular the inner rotor (31), by a motor (46) designed as a stepper motor (46) with a resolution of at least 100 steps per revolution. Printing machine (01) according to claim 1, characterized in that viewed in the axial direction of the inking unit (08; 20), a width of the metering pump (42) is smaller 50 mm is. Printing machine (01) according to claim 1, characterized in that for sealing a drive shaft (61) of the metering pump (42) a sealing seal (62) is provided, which two the drive shaft (61) enclosing seals (63) and an intermediate, with comprising pressurized oil (64). Printing machine (01) according to claim 7, characterized in that the pressure in the pressure chamber (64) is greater than the maximum during the operation of the metering pump (42) generated pressure within the delivery chambers (35). Printing machine (01) according to claim 1, characterized in that the ink by means of a pump (50) or a compressor (50) from a paint reservoir (40) to the applicator strip (38) is conveyed and that in the supply line (39) a pressure regulator ( 41) is arranged, through which regardless of the form a behind-lying pressure (P ₀ ) in the flow to the metering pump (42) is adjustable. Printing machine (01) according to claim 1, characterized in that in the flow (39) of the metering pump (42) there is a pressure (P ₀ ) of at least 2 bar above atmospheric pressure, in particular to 3 to 5 bar. Printing machine (01) according to claim 9, characterized in that a filter (43) is arranged on the path of the ink from the ink reservoir (40) to the metering pump (42). Printing machine (01) according to claim 1, characterized in that the planographic printing plate (04) has raster lines with a screen frequency between 50 and 120 lines per centimeter. Printing machine (01) according to claim 1, characterized in that the planographic printing plate (04) has raster lines with a screen frequency between 50 and 70 lines per centimeter. Printing machine (01) according to claim 1, characterized in that the planographic printing plate (04) has raster lines with a screen frequency of 60 lines per centimeter. Printing machine (01) according to one or more of claims 1 to 11, characterized in that the planographic printing plate (04) has raster lines with a screen frequency between 80 and 120 lines per centimeter. Printing machine (01) according to one or more of claims 1 to 11, characterized in that the planographic printing plate (04) is arranged on a temperature-controlled forme cylinder (07). Printing machine (01) according to claim 16, characterized in that the forme cylinder (07) is tempered from the inside. Printing machine (01) according to claim 16 or 17, characterized in that the forme cylinder (07) is tempered by a flowable tempering. Printing machine (01) according to one of claims 1 to 11, characterized in that at least one distribution cylinder (13; 15; 22; 25; 27) of the inking unit (08; 20) is tempered. Printing machine (01) according to claim 19, characterized in that all the distribution cylinders (13; 15; 22; 25; 27) of the inking unit (08; 20) are tempered. Printing machine (01) according to one of claims 19 or 20, characterized in that the at least one distribution cylinder (13; 15; 22; 25; 27) is tempered from the inside. Printing machine (01) according to claim 21, characterized in that the at least one distribution cylinder (13; 15; 22; 25; 27) is tempered by a flowable tempering agent. Printing machine (01) according to one of claims 1 to 11, characterized in that the printing ink at a temperature of 27 ° C has a viscosity of less than 350 Pa * s. Printing machine (01) according to one of claims 1 to 11, characterized in that the printing ink at a temperature of 27 ° C has a viscosity between 10 Pa * s and 150 Pa * s. Printing machine (01) according to one of claims 1 to 11, characterized in that the printing ink at a temperature of 27 ° C has a tack value between 6 to 9.5. Printing machine (01) according to one of claims 1 to 11, characterized in that the printing ink has a tack value between 7 and 8.5 at a temperature of 27 ° C. Printing machine (01) according to one of claims 1 to 11, characterized in that the printing ink for a production speed (v) of the printing press (01) of 3 m / s to 16 m / s has a tack value between 4 and 12. Printing machine (01) according to one of claims 1 to 11, characterized in that the printing ink at a temperature of 27 ° C and for a production speed (v) of the printing press (01) of 3 m / s to 16 m / s an approximately constant tack value having. Printing machine (01) according to one of claims 1 to 11, characterized in that a printing ink-transferring cylinder (06) of the printing unit (05) applies printing ink to a printing material (03) with a coating weight of up to 20 g / m ² . Printing machine (01) according to one of claims 1 to 11, characterized in that a printing ink transferring cylinder (06) of the printing unit (05) printing ink on the substrate (03) with a coating weight between 5 g / m ² and 10 g / m ² applying. Printing machine (01) according to one of the preceding claims, characterized in that the printing material (03) is formed as a material web (03) or as a sheet (03). Printing machine (01) according to one of the preceding claims, characterized in that the printing press (01) is designed as a newspaper printing press (01). Printing machine (01) according to one of the preceding claims, characterized in that the printing machine (01) is designed as a commercial printing press. Printing machine (01) according to one of the preceding claims, characterized in that the printing press (01) prints in multicolor printing. Printing machine (01) according to one of the preceding claims, characterized in that the inking unit (08) is a single-color inking unit (08). Printing machine (01) according to one of the preceding claims, characterized in that the inking unit (20) is a zweizügiges inking unit (20). Printing machine (01) according to one of the preceding claims, characterized in that at least one of the distribution cylinders (13; 15; 22; 25; 27) is movable in the axial direction. Printing machine (01) according to one of the preceding claims, characterized in that at least one of the distribution cylinders (13; 15; 22; 25; 27) is driven in the circumferential direction. Printing machine (01) according to one of the preceding claims, characterized in that the axes of the forme cylinder (07) and transfer cylinder (06) of opposing printing units (05) lie in one plane. Printing machine (01) according to claim 39, characterized in that the plane is inclined relative to the material web (03). Printing machine (01) according to claim 39, characterized in that the plane is inclined relative to the horizontal. Printing machine (01) according to claim 40 or claim 41, characterized in that the inclination relative to the material web (03) or relative to the vertical in the range between 75 ° and 88 °. Printing machine (01) according to one of the preceding claims, characterized characterized in that the forme cylinders (07) are designed for two planographic printing plates (04) seen in the circumferential direction. Printing machine (01) according to one of the preceding claims, characterized in that the forme cylinders (07) are designed for six planographic printing plates (04) viewed in the axial direction. Printing machine (01) according to claim 43 or 44, characterized in that the planographic printing plates (04) are each designed for a newspaper page in broadsheet format. Printing machine (01) according to one of the preceding claims, characterized in that the transfer cylinders (06) are designed for three printing blankets (10) as viewed in the axial direction. Printing machine (01) according to claim 46, characterized in that in the axial direction adjacent blankets (10) are arranged offset in each case in the circumferential direction by 180 °.

Images