DE102007054289A1 - Method for operating an inking unit of a printing press - Google Patents

Abstract

The invention relates to a method for operating an inking unit of a printing press, wherein the inking unit has an ink fountain in which printing ink is kept, the inking unit having a ductor roller which accommodates ink stored in the ink fountain, the inking unit being designed in particular as a paint slide or as a color meter Ink-zone actuating elements, via which a per ink zone from the ink fountain to the ductor roller to be transferred ink amount is set, and wherein the inking unit has a film roll or lifting roller is transferred via the ink from the ductor roller to at least one of the film roll or vibrating roller downstream inking roller. According to the invention, to adjust a zero position of the ink zone setting elements, in which a defined gap is formed between the ink fountain roller and the ink zone setting elements, each ink zone setting element, starting from an arbitrarily open position, with a defined speed and / or a defined force in a maximum closed position, in which each color zone actuator touches the ink fountain roller, and wherein then each ink fountain key is opened over a defined number of setting steps such that between the ductor roller and the respective ink fountain element a defined gap is formed, which corresponds to the zero position.

Description

The The invention relates to a method for operating an inking unit of a Printing machine according to the preamble of claim 1.

One Printing unit of a printing press has a form cylinder, a transfer cylinder, a Inking unit and optionally a dampening unit. On the form cylinder is positioned at least one printing form, using the Farbwerks printing ink and with the help of the dampening unit dampening solution applied to the or each printing block positioned on the forme cylinder can be. Starting from the forme cylinder, the ink on a transfer cylinder, namely at least one on the transfer cylinder transmit positioned transmission form, the transfer cylinder ultimately Apply the ink to a substrate to be printed. One Such printing unit is also referred to as offset printing unit. Of the Form cylinder is also called plate cylinder and the transfer cylinder Also referred to as rubber cylinder. With such a printing unit seen in a web press in the axial direction several pages applied side by side on a substrate.

The Inking unit of such a printing unit has a reservoir for printing ink, the several Farbzonenstellelemente are assigned. The storage container for printing ink is also called a color box. The color zone actuators that Also referred to as a color slider or color meter, are in Positioned axially next to each other, using the color zone controls for each color zone each print page printing ink individually on an ink fountain roller downstream of the reservoir can be applied. This inking roller is around a ductor roller.

Of the Ductor roller is arranged downstream of either a film roller or a squeegee roller, which decreases the ink from the ductor roller and at least one of the film roll or vibrating roller downstream inking roller transfers. About the or each of the film roller or elevator roller downstream inking roller passes The ink finally on a printing plate, which is on a Form cylinder is located.

For one proper printing operation of a Printing machine need the Farbzonenstellelemente be precisely adjusted, with the Adjusting the so-called zeroing of the ink zone setting elements of Meaning is. The zero position of a color zone setting element is defined the position of the respective Farbzonenstellelements in the closed State in which between the ink zone actuator and the ductor roller a defined, very small gap is formed, which is usually in of the order of magnitude between 0.01 mm and 0.05 mm. This zero setting must be for all color zone control elements be equal.

The Adjustment of the zero position of the ink zone adjustment elements is at the manufacturer a printing press or when commissioning a printing press carried out at the customer. This adjustment must be due to the wear of the ink zone adjustment elements be repeated at regular intervals. The adjustment of the zero position of the Farbzonenstellelemente done manually in practice, namely such that for the zero position of the ink zone setting elements a predetermined color film is adjusted and measured on the ductor roller, with subsequent actuators the color zone control elements, via which opened the same and can be closed, as well as sensors of the ink zone control elements, via which a maximum open position the ink zone control elements as well as the zero position of the same monitored can be be adjusted relative to each other. This process is very time consuming.

Of these, Based on the present invention, the problem is based a novel method for operating an inking unit of a printing press to accomplish. This problem is solved by a method according to claim 1 solved. According to the invention is for Adjustment of a zero position of the Farbzonenstellelemente, in which between the ductor roller and the Farbzonenstellelementen a defined Gap is formed, each Farbzonenstellelement starting from an open one Position with a defined speed and / or a defined Force in a maximum closed position, in which the respective Farbzonenstellelement touches the ductor roller, transferred, and then each Color zone actuator over a defined number of setting steps is opened in such a way that between the ductor roller and the respective Farbzonenstellelement a defined gap is created, which corresponds to the zero position.

Of the Relationship between a positioning step and the gap change between ink-zone controls and Ductor can be a fixed calculated value be, which results from the constructive conditions. He can but also be determined automatically by the entire Adjustment path from a maximum closed position of the ink fountain key up to a maximum open Position is set to the setting steps in relation.

With the present invention, an automatic method for adjusting the zero position of the ink zone setting elements of an inking unit proposed. The zeroing of the Farbzonenstellelemente can be performed with little time and great accuracy.

preferred Further developments of the invention will become apparent from the dependent claims and the following description. Embodiments of the invention without being limited to this to be closer to the drawing explained.

there shows:

1 : a schematic view of a printing press;

2 : a schematic view of a printing unit;

3 to 5 : a detail of the printing mechanism of the 1 in the range of an inking unit in different states to illustrate the method according to the invention.

1 shows a schematic representation of a printing press 10 , being from the printing press 10 a substructure 11 , Reel changer 12 , two towers 13 . 14 each with two superimposed pressure units 15 , a web guide 16 , a turning and folding construction 17 and a folder 18 are shown. Every printing unit 15 the two printing towers 13 has four printing units 19 , in which 2 such a printing unit 19 in more detail shows.

A printing unit 19 has a form cylinder 20 , a transfer cylinder 21 , an inking unit 22 as well as a dampening unit 23 , In the embodiment shown, two transfer cylinders roll 21 of two horizontally juxtaposed printing units 19 forming a printing gap for a substrate to be printed 24 on each other. On the form cylinder 20 is at least one printing plate and on the transfer cylinder 21 arranged at least one transmission form. The form cylinder 20 a printing unit 19 is also called plate cylinder and the transfer cylinder 21 is also referred to as a rubber cylinder. With the help of the inking unit 22 becomes printing ink and with the help of dampening 23 Dampening solution on the or each on the forme cylinder 20 positioned printing form applied, wherein the forme cylinder 20 the ink transfers to the or each transfer mold positioned on the transfer cylinder, which ultimately transfers the ink to the substrate to be printed 24 transfers.

According to 2 includes the inking unit 22 a color box 25 holding a storage container for printing ink 26 trains, taking the color box 25 a ductor roller 27 is subordinate. In addition to the color box 25 and the ductor roller 27 has the inking unit 22 over several color zone control elements 28 , which are designed as a color slider or colorimeter. With the help of the ink zone adjustment elements 28 can one per color zone from the color box 25 on the ductor roller 27 transferred color amount can be adjusted. The larger a gap between a color zone actuator 28 and the ductor roller 27 is formed, the greater is the color box for this color zone 25 on the ductor roller 27 transferred amount of color.

For adjusting the gap between the ink zone setting elements 28 and the ductor roller 27 is each color zone actuator 28 an actuator 29 assigned, over which the Farbzonenstellelemente 28 for changing the gap between them and the ductor roller 27 can be relocated. The ductor roller 27 is a compactor 30 downstream of a plurality of inking rollers, wherein in the illustrated embodiment of 2 the ductor roller 27 immediately downstream roller 31 of the roller is designed as a film roll.

The present invention now relates to a method for operating such an inking unit of a printing machine, namely for adjusting a zero position of the ink fountain control elements 28 of the inking unit. In the zero position of the ink zone setting elements 28 they form a defined gap with the ductor roller 27 in which, in the zero position of the ink zone setting elements, the gap between the ductor roller 27 and the color zone actuators 28 between 0.01 mm and 0.05 mm. This formed in the zero position of the Farbzonenstellelemente gap is in 5 marked with d _NULL .

To adjust the zero setting d _{NULL of} the ink zone control elements 28 becomes each color zone actuator 28 starting from an arbitrarily open position with a defined speed and / or a defined force in a maximally closed position (see 4 ).

In the maximum open position (see 3 ) is the gap between the ink zone actuators 28 and the ductor roller 27 maximum, with this maximum gap in 3 marked with d _MAX . In the maximum closed position (see 4 ) touch the ink zone adjustment elements 28 the ductor roller 27 , where this minimum gap in 4 marked with d _MIN .

Then the maximum open position (see 3 ) with the maximum closed position (see 4 ) is set in relation to the scaling of the adjustment between the maximum open position and the maximum closed position in a plurality of preferably equidistant adjusting steps, in which case each Farbzo nenstellelement 28 is opened over a defined number of setting steps such that between the ductor roller 27 and the color zone actuators 28 the defined gap arises, which corresponds to the zero position of the same.

The above adjustment of the zero position of the ink zone setting elements 28 is carried out automatically, preferably at regular intervals.

The above transferring the ink zone setting elements 28 from the arbitrarily open position to the maximum closed position takes place with the help of the Farbzonenstellelementen 28 associated actuators 29 where each actuator 29 via a coupling element 32 to the respective Farbzonenstellelement 28 acts. At the actuators 29 these are preferably stepper motors. Instead of the stepper motors and linear motors, electromagnets and pneumatic or hydraulic actuators and piezo drives can be used.

The adjustment according to the invention of the zero position of the ink zone setting elements 28 takes place either when the ductor roller is stationary 27 or with slowly rotating ductor roller 27 ,

According to 3 to 5 can be any actuator 29 a position sensor 33 be assigned. With the help of position sensors 33 On the one hand, the maximum open position of the ink zone control elements 28 and on the other hand, the maximum closed position thereof are monitored. From knowing the maximum open position and the maximum closed position of the ink zone actuators 28 the displacement of the same can be scaled.

For the purposes of the present invention, therefore, for the adjustment of the zero position of the Farbzonenstellelemente 28 the color zone adjustment elements 28 with a defined feed rate and / or a defined feed force from an arbitrarily open position to a maximum closed position in which the same on the ductor roller 27 abut, relocated. To the concern of Farbzonenstellelemente 28 at the ductor roller 27 ensure the actuators 29 activated over a defined time. This shifting the Farbzonenstellelemente 28 takes place either with stationary or slowly rotating ductor roller 27 , The maximum open position and the maximum closed position of the ink zone actuators 28 are related to scale the displacement thereof. Subsequently, the Farbzonenstellelemente 28 opened by a defined number of setting steps, so as to reset the zero position of the ink zone setting elements 28 adjust. This adjustment takes place automatically at regular intervals and can either be automated or triggered manually.

10

press

11

substructure

12

reelstands

13

printing tower

14

printing tower

15

printing unit

16

web guide

17

Turn- and folding construction

18

folding

19

printing unit

20

form cylinder

21

transfer cylinder

22

inking

23

dampening

24

substrate

25

paintbox

26

printing ink

27

duct roller

28

Ink-zone adjusting element

29

actuator

30

drum compactor

31

film roller

32

coupling element

33

position sensor

Claims (7)

A method of operating an inking unit of a printing press, wherein the inking unit has an ink fountain in which ink is provided, wherein the inking unit comprises a ductor roller which accommodates ink held in the ink fountain, the inking unit in particular having ink zone setting elements formed as ink slides or colorimeters the one per color zone from the ink fountain is set to be transferred to the ink fountain roller, and wherein the inking unit has a film roll or lifting roller, is transferred via the ink from the ductor roller to at least one of the film roll or vibrating roller downstream inking roller, characterized in that for adjustment a zero position of the Farbzonenstellelemente, in which between the ductor roller and the ink fountain key elements, a defined gap is formed, each Farbzonenstellelement starting from an arbitrarily open position with a defined speed and / or egg ner defined force in a maximum closed position in which the respective inking element touches the ductor roller, is transferred, and then each Farbzonenstellelement is opened over a defined number of setting steps such that between the ductor roller and the respective Farbzonenstellelement a defined gap is formed, which the zero corresponds to the position. Method according to claim 1, characterized in that that each Farbzonenstellelement starting from the randomly opened Position is transferred to the maximum closed position with standing ductor roller. Method according to claim 1, characterized in that that each Farbzonenstellelement starting from the randomly opened Position is transferred to the maximum closed position with slowly rotating ductor roller. Method according to one of claims 1 to 3, characterized that in the zero position between the ductor roller and the Farbzonenstellelementen a defined gap in the order between 0.01 mm and 0.05 mm is formed. Method according to one of claims 1 to 4, characterized in that stepper motors are used as actuators of the ink zone setting elements. Method according to one of claims 1 to 5, characterized that the adjustment of the zeroing of the ink zone setting elements automatically is carried out at regular intervals. Method according to one of the preceding claims, characterized characterized in that a maximum open position with the maximum closed position for scaling the adjustment in a variety is set by Stellre steps in relation.