EP1911581A2 - Ink dosage device for an inking system - Google Patents

Abstract

The ink dosage device has an offset rotary printing unit. The color dosage of offset printing color is carried out in the offset rotary printing unit. The offset rotary printing unit comprises a plate, rubber and impression cylinder, and is carried out by a rotating operating screen printer (1) with a scraper (2), which lies inside. The color dosage takes place through a rotating operating screen printer with a scraper or multiple scrapers attached to the lateral surface of the screen printer. Independent claims are also included for the following: (1) a method for operation of ink dosage device (2) an offset inking system with an ink dosage device.

Description

The invention relates to an inking unit or a short inking unit and an associated metering device in a printing press, in particular an offset printing machine.

The metering of printing ink by means of rotary screen printing devices is known. A generic rotary screen printing unit is among others from the DE 102 32 254 known. The rotary screen printing unit comprises a cylinder which is rotatable about a cylinder axis and whose cylinder jacket is at least partially formed by a printing screen. Inside the cylinder, a doctor blade is mounted, which is attached to a doctor blade holder and extends parallel to the cylinder axis. The doctor presses from a paint container in the direction of rotation of the cylinder in front of the doctor blade supplied ink from the interior of the cylinder through the printing screen on the material. In order to avoid a drifting of ink inside the cylinder, when no color decrease, for example, in a closed printing screen, is arranged shortly before the doctor blade tip through a connected to the ink container, extending parallel to the doctor blade ink guide with a plurality of ink discharge openings. In this case, the ink discharge openings are located directly in front of a doctor blade tip facing the printing screen and release controlled at least one control valve in dependence on the respective rotational position of the printing screen substantially point-wise in front of the doctor blade. This device is intended for direct printing on the material, an application as inking unit for a printing plate or one or more inking rollers in a printing press is not mentioned.

A print interruption can also be achieved by briefly raising the squeegee which pushes the ink through the wire. A generic doctor blade having such a function is under US 2006/0086268 disclosed.

Among other things is also from the EP 1 125 733 A1 known to equip sheet-processing printing machine for the coating of substrates with a rotary screen printing, wherein the screen of the rotary screen printing unit is in direct contact with the substrate and applies the coating on this. The patent does not mention the use of a rotary screen printing unit for use as inking device for a printing plate or one or more inking rollers, but rather the pictorial coloring of the printing material is achieved by the screen structure.

From the EP 1 250 228 B1 For example, there is known a rotary screen printer for two-sided printing of signatures, the screen printing apparatus having recesses which prevent the screen from being pushed by the grippers of the sheet leading cylinders. The rotary screen printing cylinder are associated with transfer cylinders, wherein the image is formed on the printing material by the structuring of the screen.

As metering devices for short inking today essentially metering with raster roller and chamber doctor have prevailed, as they inter alia in the US 4860652 and the DE 3541458 be revealed. The transferred amount of ink is defined by the cell geometry and the resolution of the anilox roller. In extreme cases, to change the color density, the anilox roller must be exchanged for another one. However, the color density can be within narrow limits due to the temperature of the anilox roller, as, inter alia, in the documents DE 10254501 and DE 10218359 disclosed, be regulated. Another approach is found in the scriptures EP 1291177 and DE 19840613 Here, the control of the color density is controlled by the variation of the peripheral speed between the anilox roller and the ink transfer roller. However, the dosage by means of an anilox roller has some serious disadvantages. A major disadvantage is the high production costs of the anilox rollers, which result in that a short inking unit with a screen roller dosing is not more favorable to produce than a conventional offset inking unit with a long ink roller chair, although the number of parts of the short inking unit compared to the conventional inking unit is significantly lower. Another shortcoming of the ink dosing by means of anilox rollers lies in the high manufacturing tolerances. Although the ink dosing by means of anilox rollers would require an extremely uniform cell structure due to the lack of zonal intervention possibilities, the practice nevertheless repeatedly shows manufacturing tolerances relative to the cell volume of 10 to even 30%, which are reflected in the quality of the dyeing. Another important argument speaks against the use of anilox rollers for ink dosing: During production, paint residues can deposit on the bottom of the cells. If the anilox rollers are not always cleaned completely, which is quite technically demanding, the wells slowly fill up and the transferred color volume and thus the color density on the printed sheet change. This process of adding is not always uniform, so that the color density deviation can not be compensated by a temperature control and / or slip control, as they always only act globally.

Another method for color dosing consists in the combination of a metering roller with a roller blade, in which an engraved or structured in another way roll bar with a relatively small diameter in a groove of a holder. The roller bar is pressed against the surface of the metering roller for metering. Generic representatives of such metering devices are inter alia in the DE 10045515 and the DE 19602483 described. This type of metering devices suffer from deflection because of the small diameter, so that roller blade must be supported in several places to ensure a uniform dosage across the width. However, such support increases the cleaning effort significantly, since the doctor supports are in direct contact with the paint film. In addition, the roller blade due to the small diameter has the disadvantage of relatively high peripheral speed, which syringes can be generated. In addition, the influence of the hydrodynamic pressure in the metering gap on other variants on the color dosage increases significantly.

The solution according to the invention closest comes Farbdosierwalzen for metering inking, which have a porous or holey outer wall and the color from a cavity in the interior of the roller penetrates through the openings in the outer wall to the outside. Below are some versions of such paint dosing solutions:

The DE 600 924 describes a paint distributor roller in lifting and duodeneless inking units, inside which a stationary ink chamber is arranged, wherein the ink exits through openings of the uniformly circulating hollow cylindrical ink distributor roller, wherein in the interior of the ink distributor roller a stationary cylinder is arranged so that between it and the distributor roller a very narrow cylindrical channel is formed, to which the ink is supplied through the openings of the cylinder under pressure by known means.

From the US 916357 a rotating inking roller for printing machines is known, in which the ink is discharged from the interior of an inking roller via two mutually adjustable hollow body and perforations having body to a color-permeable outer shell. By means of a freely rotatable in the interior of the ink roller hollow cylinder, the ink is forced through the perforations to the outside.

The EP 0 559 076 describes a method for color dosing and an apparatus for performing this method, in which from the interior of an ink roller, the ink is metered through radially extending bores to a shell material of porous material, wherein the dosage of the ink quantity by a constantly variable setting of the flow cross section of the holes Hollow axis with a first tube to each other, that the ink is then dispensed through a number in a rotating second tube number of holes distributed through chambers to the rotating at a differential speed casing tube, through which the ink of the applicator roll is supplied.

The DE 32 41 592 discloses a paint applicator sleeve having a compliant microporous ink storage material formed as a sleeve.

The DE 103 48 307 discloses an inking roller for an inking unit of an offset printing press having a number of rotationally disposed zones and at least one ink reservoir inside the inking roller, wherein the ink reservoir in each of the plurality of zones communicates with at least one paint exit in the lateral surface of the inking roller. In each zone inside the inking roller at least one pumping element for conveying the ink from the ink reservoir is assigned to the lateral surface.

All these metering mechanisms have the common disadvantage that the ink is metered by a pending pressure. However, printing ink for offset printing has viscoelastic properties, so that no color will flow up to a certain pressure value and color will continue to run after the end of the ink dosing. In addition, the ink supply can only be temporarily interrupted for a limited time. Another disadvantage of the solutions found is the poor purification of the solutions found. Especially with the solutions that have a relatively long exit channel (holes) or microporous surfaces of the rollers, the cleaning is difficult. It is believed that a complete cleaning is not or only at a very high cost to realize. An adjustment of the dosage takes place exclusively via the Nachförderung of the ink and / or by a change in the internal pressure, which can not be regulated as well known, such as. the dosage by a paint slide or colorimeter. The viscoelastic properties of the printing ink alone prevent effective and reproducible ink dosing.

The object of the invention is to solve these deficiencies of the known solutions by a new method for color dosing and associated devices.

This object is achieved by the characterizing features of claim 1. Further developments of the invention will become apparent from the dependent claims.

According to the invention, the color metering of offset printing ink in an offset rotary printing unit, which comprises at least one plate, rubber and impression cylinder, and by a rotary screen printing device with one or more internally applied doctor blades. In this case, in the operating condition, the ink is forced through the ink-permeable jacket of the rotary screen printing device, so that the ink to be printed on the outer surface of the screen printing device removed and in a rolling contact with inking rollers or the plate cylinder to the offset printing unit can be fed. Between the ink metering device and the inking rollers, a film gap can be provided for ink transfer in the printing unit.

The surface speed of the dye-metering device becomes substantially identical to the surface speed of the inking unit, but can also be chosen differently from the surface speed of the inking unit. A corresponding differential speed should be changeable and adjustable. For this purpose, it is particularly suitable that the color dosing device can be driven separately by means of a single drive via a single drive control.

The structure of the ink-permeable jacket of the ink metering device can be provided as a sleeve, wherein the ink-permeable jacket is formed by a plate or fabric, which is attached to the Farbdosiereinrichtung in a fastening device.
The lateral surface of the ink metering device is provided with evenly or stochastically distributed openings for ink outlet.

The doctor blades provided in the ink metering device may be one or more positive or negative working doctor blades or one or more doctor blades.

In the ink metering device, at least one ink supply device, for example a nozzle or a pump device, is provided, which conveys the printing ink into the inner cavity of the ink metering device. It can also be a variety of Be provided color supply means that can cover zonal different color requirements. For this purpose, the ink metering device can be divided into zones inside which an individually controllable ink supply device is assigned. The ink supply is stopped during a business interruption. The amount of ink in the Farbdosiereinrichtung can be monitored by suitable sensors for color quantity control, so that the amount of ink is kept within narrow limits, at the lowest possible level, the same.

On the basis of a characteristic curve or calculation rule, a color quantity can be calculated in the prepress stage from the image data of each printing unit over the entire printing unit width or zone-related. In the operating state can also be calculated or derived according to the amount of ink to be conveyed. Likewise, on the basis of densitometric and / or colorimetric measurements, the ink feed into the ink metering device can be regulated by a desired-actual comparison.

The ink metering can in this case regulate both the ink supply and the differential speed between the ink metering device and a corresponding roller.

According to the invention, ink which has not been removed in the ink gap between the ink metering device and the corresponding roller can be scraped off by a positive or negative doctor blade or pressed back into the interior of the ink metering device. Furthermore, rollers can roll on the outer jacket of the ink metering, which serve to equalize the remaining color layer after the color splitting or optionally as an additional evaporation surface for fountain solution. The transferable amount of ink can be changed in a simple manner by changing a first sieve against a sieve having a different color permeability.

The inking unit may be part of a sheet-fed or a web offset printing press, which for printing different substrates, such as paper, cardboard, coated paper or cardboard, corrugated cardboard, plastic film or plates or Metal sheets is suitable. Herein can be spanned on the plate cylinder, a wet or dry offset plate or a high-pressure plate, the offset printing unit is operated with or without dampening. The ink metering device can in this case meter heatset, coldset, conventional oily sheet-fed offset ink, radiation-curing printing ink or dry offset ink. The printing ink may optionally be adapted in its property profile to the processing conditions of the ink metering device.

Figur 1

ein Schema einer erfindungsgemäßen Farbdosiereinrichtung in Dosierbetrieb,

Figur 2

ein Schema einer Farbdosiereinrichtung nach Figur 1 im abgestellten Zustand,

Figur 3

eine erste Variante einer Farbdosiereinrichtung in einem Offsetdruckwerk,

Figur 4

eine zweite Variante einer Farbdosiereinrichtung in einem Offsetdruckwerk mit verkürztem Farbwerk,

Figur 5

einer Farbdosiereinrichtung in Zuordnung zu einer zylindergroßen Farbauftragwalze, und

Figur 6

eine Farbdosiereinrichtung in Zuordnung zu einem Plattenzylinder.

In the following the invention will be explained in more detail with reference to drawings. Show here

FIG. 1

a diagram of a Farbdosiereinrichtung invention in dosing,

FIG. 2

a diagram of a paint metering device according to Figure 1 in the parked state,

FIG. 3

a first variant of a Farbdosiereinrichtung in an offset printing unit,

FIG. 4

a second variant of a Farbdosiereinrichtung in an offset printing unit with shortened inking unit,

FIG. 5

a Farbdosiereinrichtung associated with a cylinder-sized inking roller, and

FIG. 6

a Farbdosiereinrichtung in association with a plate cylinder.

An ink dosing device according to the invention for an inking unit of an offset printing press has at least one ink dosing device, as used in rotary screen printing. Such a rotary screen printing device (1) is characterized by a shell which encloses a cavity which can have openings through the paint on the lateral surface of the device, and by a located inside the cavity doctor blade (2), which in the operating state from the inside against the outer jacket is employed. In the interior of the roller there is at least one ink reservoir.

The ink dosing device according to the invention describes a known ink dosing system which is very well suited for the metering of high-viscosity printing inks. The viscosity of the inks in screen printing does not differ significantly from the viscosity of the printing inks in offset printing, which is achieved by such a Farbdosiereinrichtung standard offset or offset inks can be printed with only minor modifications, while in the dosage by means of chambered doctor blade and anilox usually special colors must be used.

Such Farbdosiersysteme are known and mature. What is new, however, is the use of such systems for color dosing in an offset printing unit.

The ink-permeable jacket of the rotary screen printing device (1) can be formed as a sleeve or in the uninflated state as a flat screen that is stretched around a holding frame and with holding devices, e.g. Is held hook. The material of the screen may be a metal, a metal-plastic compound, a plastic material or a rubber material. The hole pattern can be of uniform or stochastic nature.

The rotary screen printing device (1) transfers in the metering operation, the ink on at least one roller (5). The roll may be part of an offset inking unit having a plurality of rollers (11) and a plurality of inking rollers (10), or one or more inking stands (10) of a short inking unit as shown in FIG. The roller may also be a plate cylinder (6) of an offset inking unit, wherein the ink from the rotary screen printing device (1) directly on the offset printing plate or high-pressure plate, which is located on the plate cylinder (6) is dosed (see Figure 6). Alternatively, the plate cylinder can also be imaged directly, then eliminates the pressure plate as a carrier of the image information.

In connection with the invention are also different versions of an offset printing unit. The offset printing unit has at least one inking unit according to the invention. The offset printing unit can be a wet offset printing unit, in which the separation between printing and non-printing elements on the printing plate by first on the printing plate with a dampening unit (13) a water film is applied and then in the direction of rotation (9) of the impression cylinder (8 ) Following the ink by means of an inking unit (11) with at least one inking roller (10) applies the ink. The inking unit can also be an offset printing unit, which works in dry offset with Toray plates or with Lettersetplatten (high-pressure plates).

The inking unit (11) can have a multiplicity of rollers and comprises iridescent ink drivers for the lateral trituration of the printing ink. In this case, the rotary screen printing device (1) can be in contact with an inking roller, as shown in Figure 3, or with multiple inking rollers, as shown in Figure 4.

The offset inking unit is part of an offset printing unit, which comprises at least one ink metering device, at least one inking roller (10), a plate cylinder (6), a blanket cylinder (7) and an impression cylinder (8). The printing sheet or the roller conveyor is printed in the printing nip (14) between the rubber (7) and impression cylinder (8). In the special case of an offset printing unit with an application of the printing ink with the rotary screen printing device (1) directly to the printing plate on the plate cylinder (6) or the illustrated plate cylinder (6), as shown in Figure 6, eliminates the inking roller (10). The offset printing unit can be part of a sheet-fed printing press or a web-fed printing press. A sheet-fed printing press can have a feeder, a number of printing units, optionally one or more finishing plants (stamping, Rillwerk, coating unit, cold foil application), optionally a turning device and a boom.

A web-fed printing press may include a roll changer, a number of printing units that print the web on the top and bottom, a dryer and a folder.
Typical printing materials that can be printed in the offset printing units according to the invention are paper, plastic films, coated papers and cardboard, cardboard, corrugated cardboard or metal sheets.

In the inking unit according to the invention, as shown in Figure 1, a rotary screen printing device serves as a color source. The rotary screen printing device has an internal squeegee, which presses against the lateral surface of the screen printing device (1) from at least in the operating state and causes the ink to emerge from the interior to the lateral surface through the openings located in the lateral surface. The doctor blade can be positively or negatively set from the inside against the lateral surface, the doctor can be a squeegee or any other suitable squeegee shape.
The lateral surface of the screen printing device (1) rolls on at least one further inking unit roller (5) or on the plate cylinder (6), as shown in Figure 6, from. The rotational speed of the screen printing device (V1) can be identical to the rotational speed of the corresponding roller (5), but the rolling rolling on one another can also have a differential speed, so that a slip occurs, which causes a further dosage and homogenization of the ink film.

The direction of rotation (4) of the screen printing device (1) can be the same or opposite to the direction of rotation of the corresponding roller (5). By choosing the direction of rotation can also affect the homogenization of the color film and also a further Dosiermöglichkeit be created.

As an alternative to the rolling contact between the screen printing device (1) and the corresponding inking roller / inking rollers (5) or plate cylinder (5) may be between the two elements also a film gap (19), ie the screen printing device (1) and the corresponding roller or plate cylinder (5) stand not in contact with each other. The ink is transferred via the film gap (19). The information on the direction of rotation and the differential speed can be given identically to the information on the touching contact.

The drive of the screen printing device (1) can be connected via a gear or a gear group with the drive of the inking unit (11). The drive can also be done via a fixed or adjustable coupling. Alternatively, the screen printing device (1) can also have a single drive (15) which makes the screen printing device (1) independent of the rest of the machine. This single drive (15) is controlled and / or regulated by a single drive control (16).

The screen printing device (1) has at least one ink feed, which introduces the ink into the interior of the screen printing device. This ink conveyor is ideally so connected to the machine control that it receives a signal from the machine control and only in case of operation, when ink is needed, color is pumped into the interior of the screen printing device.

The screen printing device (1) may also have a plurality of ink supply devices, which may for example cover zonal different color requirements. For this purpose, the screen printing device (1) is ideally divided into zones inside, wherein each zone is associated with a color feeder, which can be advantageously controlled individually. The separation into zones can be done, for example, by radial disks, which are fixedly mounted on a shaft and limit the individual chambers. The amount delivered by the ink-supplying devices may be zonally different depending on the color requirement.

In the case of a production stop, it makes sense to interrupt the color transport to the lateral surface of the screen printing device. This can be done firstly by the doctor device (2) pneumatically, hydraulically, mechanically or electrically is lifted from the inner surface of the lateral surface of the screen printing device (1) and thus no more doctoring of the ink takes place.

As an alternative or in addition to the lifting off of the doctor blade, the doctor blade can be left on or raised against the inner surface of the screen printing device (1) and the ink supply is interrupted. It makes sense to choose the amount of ink in the screen printing always just so that the amount just enough for the ink supply. This can be determined on the basis of predetermined values which are derived, for example, from the zonal areal coverage values or the areal coverage values of the entire printing plate and from which the required quantities of color are then derived via a calculation rule or characteristic curve. As an alternative to controlling the amount of ink, the amount of ink in the interior of the screen printing device (1) via one or more sensors constantly monitored and obtained from the sensor signal, a control signal for controlling the amount of ink inside the screen printing device (1).

By a densitometric and / or colorimetric measurement of color values on the printed sheet or the printed web, the current color requirement can be determined by a target-actual comparison. These values obtained can be used as a control variable in the sense of a closed-loop control for the ink feed device or the ink feed devices and / or the slip between the ink metering device and the corresponding roller (5).

The total amount of metered ink can be easily changed by changing the sieve sleeve or the hinged sieve plate. The amount of ink transferred is determined, inter alia, by the size and number of openings, by the sieve thickness and the mesh size. By simply replacing the sleeve or the wound screen plate a simple change in the amount of ink is possible. This distinguishes, among other things, this dosing method over other methods.

In the gap between the screen printing device (1) and the corresponding roller (5) or the corresponding rollers and ink can also be splitted back on the outer surface of the screen printing device (1). This recycled ink can be scraped off and disposed of or supplied for further use by one or more doctor blade (17), which act from the outside against the lateral surface of the screen printing device. Ideally, the squeegee pushes the ink back through the openings back into the interior of the ink metering, so that the ink can be reused. Alternatively, rollers or a group of rollers can roll on the outer surface of the screen printing device in contact, which are not in the flow of color and uniform the surface profile. Likewise, this roll group can be doctored off by a doctor or more squeegee. A roller group rolling on the lateral surface of the screen printing device additionally has the advantage that the surface of the inking unit is enlarged when used in a short inking unit. When used in wet offset, the evaporation of the often disturbing dampening solution is thereby promoted.

LIST OF REFERENCE NUMBERS

1

Rotary working screen printer

2

inside squeegee

3

Printing ink / ink reservoir

4

Direction of rotation of the screen printing device

5

With 1 corresponding ink roller or plate cylinder

6

plate cylinder

7

rubber cylinder

8th

Impression cylinder

9

Direction of rotation / conveying direction impression cylinder

10

Ink coater / ink rollers

11

inking

12 ^-

Dampener roller

13

dampening

14

Pressure gap between rubber and impression cylinder

15

drive

16

drive control

17

doctor

18

drip tray

19

Film gap between 1 and 5

Claims (38)

Ink metering device for metering printing ink,
characterized in that
the color metering of offset ink in an offset rotary printing unit comprising at least one plate (6), rubber (7) and impression cylinder (8), and by a rotary screen printing device (1) with at least one internally applied doctor blade (2). Ink metering device according to claim 1,
characterized in that
the color metering by a rotary screen printing device (1) with an inside of the lateral surface of the screen printing device (1) applied doctor blade or more squeegees (2), wherein the squeegee (2) at least in the operating state, the ink through the ink-permeable jacket of the rotary working Screen printing device (1) presses, so that the printing ink to be printed on the outer surface of the screen printing device (1). Ink metering device according to claim 1 or 2,
characterized in that
the ink metering device is in rolling contact with at least one inking unit roller (5) or the plate cylinder (6) of the offset printing unit and transfers the ink from the ink metering to the inking roller or the plate cylinder at least proportionally. Ink metering device according to claim 1 or 2,
characterized in that
a film gap (19) exists between the ink metering device and the corresponding inking unit rollers (5), ie the ink is transferred via a Gap transferred into the printing unit and the Farbdosiereinrichtung and the corresponding inking unit roller or the inking unit rollers (5) are not in contact with each other. Ink metering device according to claim 1 or 2,
characterized in that
the direction of rotation of the ink metering device is equal or opposite to the direction of the inking unit. Ink metering device according to claim 1 or 2,
characterized in that
the surface speed of the ink metering device is within narrow limits identical to the surface speed of the inking unit. Ink metering device according to claim 1 or 2,
characterized in that
the surface speed of the ink metering device is not equal to the surface speed of the inking unit. Ink metering device according to claim 1 or 2 and 7,
characterized in that
the differential speed is changeable and adjustable. Ink metering device according to claim 1 or 2,
characterized in that
the ink metering device is connected to the inking unit drive via a rigid drive. Ink metering device according to claim 1 or 2,
characterized in that
the Farbdosiereinrichtung with interposition of a fixed or adjustable Transmission gear is connected to the inking unit. Ink metering device according to claim 1 or 2,
characterized in that
the paint dosing device has a single drive, which can be driven separately via a single drive control. Ink metering device according to claim 1 or 2,
characterized in that
the color-permeable jacket of the ink metering device is designed as a sleeve (sleeve). Ink metering device according to claim 1 or 2,
characterized in that
the ink-permeable sheath is formed by a plate or fabric which is fastened in a fastening device to the Farbdosiereinrichtung. Paint dosing device according to claim 1 or 2 and one of claims 12 or 13;
characterized in that
the color-permeable jacket is formed by a rubber, plastic, metal or a combination Nerbundmaterial. Ink metering device according to claim 1 or 2,
characterized in that
The lateral surface of the ink metering device has uniformly or stochastically distributed openings for ink outlet. Ink metering device according to claim 1 or 2,
characterized in that
it is at the inside of the lateral surface of the ink metering device Squeegee is one or more positive or negative working squeegee. Ink metering device according to claim 1 or 2,
characterized in that
it is in the voltage applied internally to the lateral surface of the ink metering doctor blade to one or more roller blade. A method of operating a paint dosing device according to claim 1 or 2 and one of claims 15 or 16,
characterized in that
the doctor is provided in the operating state of the offset printing unit inside against the lateral surface of the Farbdosiereinrichtung and turned off during a business interruption. Apparatus for carrying out the method according to claim 18, characterized in that
the Beistellbewegung and / or the Abrückbewegung hydraulically, mechanically, for example via springs or levers, electrically or by combinations of the means listed above. Ink metering device according to claim 1 or 2,
characterized in that
the ink metering device comprises at least one ink supply device, for example a nozzle or a pump device, which conveys the printing ink into the inner cavity of the ink metering device. Ink metering device according to claim 1 or 2,
characterized in that
the ink metering device has a multiplicity of ink supply devices which can cover zonally different color requirements, for which purpose the ink metering device is at least partially divided into zones inside, and Each zone is associated with a color feeder, which can be controlled individually. Ink metering device according to claim 1 or 2 and 21,
characterized in that
the classification of the zones is carried out by radially arranged discs, which are fixed or adjustable mounted on an axis and limit the individual zone chambers. A method of operating a paint dosing device according to claim 1 or 2 and 19 to 22,
characterized in that
in case of an interruption of operation, the ink supply is stopped. A method of operating a paint dosing device according to claim 1 or 2 and 19 to 22,
characterized in that
the amount of ink in the interior of the ink metering device is monitored by one or more suitable sensors in terms of ink quantity control and the signal or signals obtained are used so that the amount of ink is kept the same by controlling the Farbzuführvorrichtung within narrow limits, at the lowest possible level. A method of operating a paint dosing device according to claim 1 or 2 and 19 to 22,
characterized in that
Based on a characteristic curve or a calculation rule in the prepress from the image data of the individual printing unit, a color amount, either over the entire printing unit width or based on zones, is calculated and in the operating state nachgefördert only the amount of ink through the ink supply device, which corresponds to the calculated or derived amount of ink. Method according to claim 25,
characterized in that
the calculation rule or characteristic curve during the set-up phase or operating phase by the machine operator, for example by an input on the machine control station, can be adapted to the real operating conditions. Method according to claim 25,
characterized by
that measured values are obtained in the printing machine or on a measuring desk on the printing sheet or the roller conveyor with densitometric and / or colorimetric measuring methods and these measured values are then subjected to a desired-actual comparison, optionally with calculation rules or characteristic curves, and from the obtained deviation data then control data, possibly based on calculation rules and / or characteristics, are obtained, which control the ink supply in the Farbdosiereinrichtung by means of the ink supply. Method according to claim 25,
characterized by
that measured values are obtained in the printing machine or on a measuring desk on the printed sheet or the printing material web by densitometric and / or colorimetric measuring methods and that these measured values are then subjected to a nominal / actual comparison, if appropriate taking into account calculation rules or characteristic curves, and that from obtained deviation data control data, if appropriate, on the basis of calculation rules and / or characteristics obtained, which regulate the differential speed between the ink metering device (1) and the corresponding roller (5). Method according to claim 1, 27 or 28,
characterized in that
for the purpose of coloring a color control process is carried out in that the control of ink metering is carried out by a combination of a change in the ink supply in the ink metering device and a change in the differential speed of the ink metering device with the corresponding roller. Ink metering device according to claim 1 or 2,
characterized in that
after the color separation in the ink gap between the Farbdosiereinrichtung (1) and the corresponding roller (5) from the outer surface of the Farbdosiereinrichtung not removed during ink splitting ink by a positive or negative working doctor blade (17) scraped or in the interior of the ink metering again is pressed back. Ink metering device according to claim 1 or 2,
characterized in that
at least one roller rolls in contact on the outer jacket of the ink metering device, which is not directly involved in the ink flow of the inking unit and which serves to equalize the ink on the surface after the color splitting and / or optionally as an additional evaporation surface for the dampening solution. Ink metering device according to claim 1 or 2,
characterized in that
the transferred amount of ink is changed by a change of a first screen against a different in terms of its color transmission screen in a simple manner. Offset inking unit with a Farbdosiereinrichtung according to claim 1 or 2, characterized in that
the offset inking unit component of a sheet-fed press with a feeder, a number of printing units, consisting of at least one plate, rubber and impression cylinder, optionally one or more finishing plants (stamping, Rillwerk, coating unit, cold foil application), optionally one or more turning devices and a boom, is. Offset inking unit with a color metering according to claim 1 or 2, characterized in that
the offset inking component of a web-fed printing press with a roll changer, a number of printing units, consisting of at least one plate, rubber and impression cylinder, which preferably print on both sides of the roller conveyor, optionally a dryer and optionally a folder or reel. Offset printing unit with a color metering according to claim 1 or 2, characterized in that
in the offset printing unit papers, cardboard, coated papers or cardboard, corrugated cardboard, plastic film or plates or metal sheets are printed. Offset printing unit with a color metering according to claim 1 and 33 or 34, characterized in that
on the plate cylinder a wet offset plate, a dry offset plate or a high-pressure plate is clamped, and the offset printing unit is operated with or without dampening. Offset printing unit with a color metering according to claim 1 and 32 or 33, characterized in that
the plate cylinder bears no printing plate, but is directly imageable. Offset printing unit with a color metering according to claim 1 and 32 or 33, characterized in that
via the ink metering device heatset, coldset, conventional oil-containing Sheet offset ink, radiation-curing ink or dry offset ink is metered and the ink is optionally adapted in their property profile of the processing conditions of the ink metering device.

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