DE102009027383A1 - Methods for determining presetting parameters for inking printing unit of printing machine, involves subdivided printed subject into color zones with defined axial extension - Google Patents

Abstract

The method involves subdivided printed subject into color zones with defined axial extension. The preset parameters are determined for each grinding roller such that a color layer thickness is minimized in the periphery extension.

Description

The The invention relates to a method for determining preset parameters for an inking unit of a printing unit of a printing press after Preamble of claim 1.

One Inking unit of a printing unit of a printing press has a color box and a cooperating with the color box Ductor roller, wherein in the ink fountain ink is kept ready, which depends on the opening position of the Farbkasten associated with color box, which serves as a colorimeter or color slides are formed, starting from the ink fountain the ductor roller passes. The ductor roller is a lifting roller or downstream of a film roll, wherein in inking of sheet-fed presses the ductor roller typically a lifting roller and inking units a roller printing machine of the ductor roller typically a film roll is subordinate. An inking unit still has several inking rollers on a forme cylinder of the printing unit Unroll and print on at least one on the form cylinder Apply positioned printing form. Between the lifter roller or Film roller and the inking rollers are multiple inking rollers positioned to the ink in the direction of the inking rollers to promote, wherein at least one of these inking rollers is formed as a distributor roller, in the axial direction of the distributor roller seen performs a so-called traversing movement.

Out In practice, it is already known for an inking presetting to determine to print directly with good recording results to achieve and reduce the printing of waste.

So it is already state of the art based on pre-press data of the subject, which with the printing unit having the inking unit is to be printed, for the Farbzonenstellelemente the individual ink zones and the squeegee roller or film roller presetting parameters to investigate. The presetting parameters for the Farbzonenstellelemente and the lifting roller or film roll such determines that at the beginning of printing in each color zone a defined Area coverage is provided.

This related art is for example from the DE 33 38 143 C2 , of the DE 44 36 953 C1 as well as from the DE 10 2004 043 372 A1 known.

Even though with the procedure known from the prior art for the determination Presetting parameters for the ink zone setting elements and the squeegee roller or film roller already at the beginning of printing good printing results can be provided, there is a further need improvements to print quality directly when recording the printing operation even further increase.

Of these, Based on the present invention, the object is based a novel method for the determination of preset parameters for to create an inking unit of a printing unit of a printing press.

These Task is achieved by a method according to claim 1 solved. According to the invention with to the inking unit having printing unit to be printed sujet not only in ink zones with defined axial extension but additionally subdivided into segments with defined circumferential extent in the pressure direction, from which presetting parameters for the or each distributor roller be determined so that in each segment, a color layer thickness change in circumferential extension is minimal and thus color thickness differences be avoided in circumferential extent.

With the inventive method is the first time proposed that a subject to be printed additionally in segments with a defined extent extension to subdivide. A subject Accordingly, according to the invention is not only in color zones with a defined axial extent, but additionally in the segments with a defined circumferential extent in the printing direction subdivided. From this then presetting parameters for Inking determined, namely preset parameters for the or each distributor roller of the inking unit, in such a way that in each segment a color layer thickness change in circumferential extent is minimal. In particular, the other default parameters remain of the inking unit, ie the presetting parameters for the ink zone setting elements and the squeegee roller or film roller, unchanged. With the The method according to the invention can be used immediately achievable print quality when recording the printing operation be further increased, so that the printing of waste reduced can be.

preferred Further developments of the invention will become apparent from the dependent claims and the description below. Embodiments of the Invention are provided without being limited thereto explained in detail the drawing.

there shows:

1 : a schematic representation of an inking unit of a printing unit of a sheet-fed press; and

2 : a diagram to illustrate the method according to the invention for the determination of Presetting parameters for an inking unit of a printing unit of a printing press.

1 shows a schematic representation of an inking unit 10 a printing unit of a printing press, in particular a sheet-fed printing press, wherein the inking unit 10 of the 1 several inking rollers 11 which is on a forme cylinder 12 one the inking unit 10 Roll it out to print at least one on the forme cylinder 12 Apply positioned printing form.

The inking unit 10 of the 1 includes in addition to the inking rollers 11 continue a color box 13 and one with the color box 13 cooperating ductor roller 14 , The color box 13 are assigned Farbzonenstellelemente, which are referred to as a color slider or color meter, wherein depending on the position of the Farbzonenstellelemente ink from the ink fountain 13 removed and per color zone on the ductor roller 14 is applied.

Between the lifter roller 15 and the inking rollers 11 are several inking rollers 16 respectively. 17 positioned. At the inking rollers 16 In the exemplary embodiment shown, these are so-called distributor rollers which execute a so-called traversing movement in the axial direction thereof. The inking rollers 17 do not perform such traversing movement, are therefore seen fixed in the axial direction of the same.

2 shows a subject 18 which is on the the inking unit 10 comprehensive printing unit should be printed, with the subject 18 seen in the axial direction in the already mentioned, several color zones 19 is subdivided.

For each of the color zones 19 can be from prepress data of the subject to be printed 18 as presetting parameter of the inking unit 10 a preset value for the ink fountain key of the respective ink zone 19 be determined so as to start printing in each of the ink zones 19 one for printing the subject 18 required, defined area coverage per color zone 19 provide. Not only are preset parameters for the ink zone setting elements of the ink zones 19 , but also presetting parameters for the squeegee roller 15 , For example, a Hebertakt same, determined. This determination of the presetting parameters for the ink zone setting elements and the lifting roller 15 based on prepress data of the subject to be printed 18 is already state of the art and therefore familiar to the person mentioned here.

For the purposes of the present invention, it is proposed that the subject to be printed 18 not just in the color zones 19 with defined axial extent, but rather additionally into segments 20 to subdivide a defined circumferential extent in the pressure direction. From the prepress data of the subject to be printed 18 and the distribution of the ink layer thickness FD in the circumferential direction U is seen for each of the segments 20 a change in the ink film thickness FD in the circumferential direction U, which results in the printing with the Voreinstellparameters for the Farbzonenstellelemente and the lifting roller 15 established.

It is within the meaning of the invention, as a further Voreinstellparameter for the inking unit 10 using the prepress data of the subject to be printed 18 Presetting values for the distributor rollers 16 of the inking unit 10 to be determined, namely such that in each of the segments 20 the change of the ink layer thickness FD in the peripheral extension U becomes minimal. The goal here is that within each segment 20 over the entire circumferential extent U of the segment 20 seen a constant value of the ink layer thickness FD and thus the optical density is provided.

In the preferred embodiment of the 2 in which the inking unit 10 several distributor rollers 16 are used as Voreinstellparameter for the distributor rollers 16 a Verreibungshub and a Verreibungsbeginn or trituration use of the same determined. It can be provided that for at least one distributor roller 16 an individual Verreibungsbeginn and thus a Verreibungsbeginn offset to the or each other Reiberwalze 16 is determined. Alternatively or additionally, an individual Verreibungshub and thus a Verreibungshub offset to the or any other distributor roller can be further determined for at least one distributor roller.

When determining the presetting parameters for the distributor rollers 16 remain the preset parameters for the ink zone actuator and the squeegee roller 15 unchanged.

At this point it should be noted that under a Verreibungsbeginn or trituration use an angular position of the forme cylinder 12 to be understood, in reaching the respective distributor roller 16 begins with the traversing movement. The Verreibungshub is the amount of axial traversing movement of the distributor roller to understand. Regarding these two parameters can be for each friction roller 16 an individual default can be determined.

According to a first advantageous development of the invention, these determined preset values are displayed, which are then manually adopted by a printer at the control station for printing. After a second advantageous Wei Alternatively, it is possible to automatically determine the preset values determined in the control station for presetting the inking unit 10 to take over.

By means of the method according to the invention, color layer thickness differences in the circumferential direction of the subject 18 minimized and thus the print quality can be increased. At the beginning of a print job, less waste will be printed.

LIST OF REFERENCE NUMBERS

10

inking

11

Inking roller

12

form cylinder

13

paintbox

14

duct roller

15

vibrator roller

16

distributor roller

17

Inking roller

18

subject

19

color zone

20

segment

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3338143 C2 [0005]
• - DE 4436953 C1 [0005]
• DE 102004043372 A1 [0005]

Claims (6)

A process for the determination of Voreinstellparametern for an inking unit of a printing unit of a printing machine, wherein the inking a color box with the ink fountain associated Farbzonenstellelementen for metering the amount of ink per ink zone on a co-operating with the ink fountain duct roller, one of the ductor roller downstream elevator roller or film roll, several on a forme cylinder Compressor rolling inking rollers, and a plurality of positioned between the lift roller or the film roller and the inking rollers inking rollers, which is at least designed as a traversing movements Reiberwalze formed comprises, based on Druckvorstufedaten on the printing unit having the printing unit to be printed sujet for Farbzonenstellelemente the individual ink zones and the squeegee roller or film roller presetting parameters are determined such that in each color zone, a defined area coverage is provided, characterized gekennz This ensures that the subject to be printed is subdivided not only into ink zones with a defined axial extent but also into segments with a defined circumferential extent, and that presetting parameters for the or each distributor roller are determined in such a way that a color layer thickness change in circumferential extent is minimal in each segment. Method according to claim 1, characterized in that that if the inking unit has a single distributor roller, then as Voreinstellparameter for the distributor roller a Verreibungshub and a Verreibungsbeginn or trituration use of the same determined become. Method according to claim 1, characterized in that that when the inking unit has a plurality of distributor rollers, as Presetting parameters for the distributor rollers a Verreibungshub and a Verreibungsbeginn or trituration use of the same determined become. Method according to claim 3, characterized that in this case for at least one distributor roller an individual Verreibungsbeginn or trituration use and thus a Verreibungsbeginn Offset to the or any other distributor roller is determined. Method according to claim 3 or 4, characterized that in this case for at least one distributor roller an individual Verreibungshub and thus a Verreibungshub offset to the or each other Driven roller is determined. Method according to one of claims 1 to 5, characterized in that in the determination of the preset parameters for the or each distributor roller the default parameters for the ink zone control elements of the individual ink zones and the squeegee roller or film roller remain unchanged.

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