DE102017222094A1 - Printing unit of a printing press and method for operating a printing unit of a printing press - Google Patents

Abstract

The invention relates to a printing unit of a printing press, in particular a Bogenoffsetrotationsdruckmaschine in aggregate and series construction, with a forme cylinder and a roll mill and a method for operating a printing unit of a printing press with a forme cylinder and a roll mill.
The invention has for its object to provide an alternative printing unit or an alternative printing press with a printing unit or an alternative method for operating a printing unit of a printing press. In particular, a faster reaction time of the printing unit should be achieved.
According to the invention, the object is achieved in that at least one of the rollers is designed as a distributor roller (8.1, 8.2),
wherein an ink fountain (4) cooperating with a ductor (6) is provided,
wherein the ductor (6) cooperates with a radially displaceable first roller (7.1) of the roller mill
wherein the ductor (6) is driven with at least approximately machine speed,
wherein the ink fountain (4) has a color knife (14) which has an adjustable gap (S) to the ductor (6) and
wherein at least one metering lever (16) for changing the gap (S) is provided.

Description

The invention relates to a printing unit of a printing press, in particular a Bogenoffsetrotationsdruckmaschine in aggregate and series construction, with a forme cylinder and a roll mill and a method for operating a printing unit of a printing press with a forme cylinder and a roll mill.

For example, printing units with ink ducts or with a dye lifter feeder are known. In this case, the individual ink layer thickness is generated by a gap (3 - 300 microns), wherein a color removal length (for example, 10 to 160 mm) is variable by the rotational speed of the ink fountain roller. The amount of color is absorbed by a lift and delivered to the much faster rotating color chair. As a rule, this happens once for all three plate cylinder revolutions. With low color consumption, this ratio can be changed. Correction constantly balances the ratio of used and traced color. This compensation can be done manually or automatically. Although it is a wide range of colors and substrates editable. Disadvantageously, however, a change in color is dependent on the change of the motif to be printed and comparatively slow. At 100% area per zone it takes about 50 sheets. At 1% area rate, it takes about 5000 sheets. A plus correction is always faster than a minus correction. Under optimal conditions, 150 waste sheets can be achieved when changing jobs. In reality, double is often required, or many times more if the paint consumption is low. Furthermore, the repeatability of jobs due to tolerances in the ink gap and changed framework conditions (color, substrate, climate) is only possible to a limited extent.

Gravuflow inking units are also known, in which an anilox roller with a squeegee determines the ink layer thickness which is fed to a roll of the same size as the printing plate. Since the color film is fed again per plate cylinder revolution, this is not subject-dependent. The unused color is returned. By changing the temperature, the layer thickness can be slightly corrected. The printed sheets can already have sufficient quality from the tenth sheet. Disadvantageously, however, the use is only possible in dry offset for standard layer thicknesses. Different surface qualities of the printing material result in different color densities. Constant color quality, the same amount of filling and air conditioning are basic requirements.

Furthermore, inking units with scoop rollers in gravure or flexographic printing are known. Here, the required amount of ink is the same for the same substrate and recurring motifs. By appropriate depression this amount of ink is absorbed by a scoop roller and fed to the color chair. This is quite constant after a short break-in period. Disadvantageously, this is only for consistent motifs in rotary printing, z. B. wallpaper printing.

From the DE 100 20 510 A1 a metering system for inking rollers in a printing machine is known, wherein a plating device is arranged to be arranged parallel to the shell surface of a roller.

From the DE 10 2013 225 691 A1 is a remotely controllable actuator known, which acts via levers on color meter.

The invention has for its object to provide an alternative printing unit or an alternative printing press with a printing unit or an alternative method for operating a printing unit of a printing press. In particular, a faster reaction time of the printing unit should be achieved.

According to the invention the object is achieved by a device having the features of the independent device claim and a method having the features of the independent method claim. Advantageous embodiments will become apparent from the dependent claims, the description and the drawings.

The invention has the advantage that an alternative printing unit or an alternative printing machine with a printing unit or an alternative method for operating a printing unit of a printing press is provided. In particular, a faster reaction time of the printing unit is achieved. Compared to a siphon inking can advantageously be removed the lifter stroke as a disturbance. Further, by eliminating the lifter, spraying of paint in the lifter area, which occurs due to the large speed changes of the lifter, can be reduced or eliminated.

Preferably, the ductor is assigned to a first roller of the roller mill, which has, for example, a rubber coating and whose axis of rotation is arranged so as to be radially displaceable by an actuator, in particular a lever pivoting about a contact zone to the downstream roller or a tilting linkage. More preferably, the ductor is provided with a ceramic coating whose axis of rotation is not displaceably mounted on the frame. The drive of the ductor is preferably carried out in synchronism with the engine speed. The drive can be done for example via a coupling connection to the drive wheel train of the machine, wherein in a reverse rotation of the Machine, the ductor is preferably decoupled to prevent the conveyance of paint or paint from the ink fountain. In a printing unit, the first roller of the roller mill, which is connected to the ductor, can bring about a separation of the color cast by its displaceability and thus set a color distribution. A roller or the ductor can furthermore have a temperature control.

Preferably, the ink fountain works very accurately and in much thinner layers, in particular with a gap of 3 to 30 microns. It is also preferred to use a continuous, in particular over-wide, ink knife, for example made of spring steel. The colorimeter may be further lasered or slit by laser. In particular, compensations for the bending capability of the colorimeter, the deflection of the ink fountain or the expected gap extension in the case of speed change or speed increase are determined and applied.

More preferably, a plurality of support or metering levers are provided in the ink fountain over the ink fountain width or format width, which support or lift in particular the ink knife cooperating with the ink duct of the ink fountain. In this case, preferably an additional support lever, in particular outside the printing width fixed or at least grundjustierbar firmly attached. The color jaws of the ink fountain are next to or preferably on the gap forming the ductor colorimeter. The color jaws, for example, after DE 10 2007 003 943 A1 be executed. Alternatively, the ductor laterally each have a ball bearing at the height of the color jaws, the outer diameter of the ductor and bearing are in particular the same size. So that no color between the bearing and the ductor can penetrate, in particular a Simmerring is installed and / or the entire area with overpressure, for example, acted upon by lubricant. For example, a lubricant bearing may be provided for each bearing. In this case, a suitable lubricant should be used, since still a small part of the lubricant can penetrate into the paint.

The at least one and preferably all metering levers are preferably made quite long in order to achieve a favorable transmission ratio. For example, a travel of about 2 mm can be provided to a 30% made by the metering travel of 30 microns. The transmission ratio of travel to travel can thus be at least approximately 66 to 1 over a first lever length to a second lever length, for example. Further, a larger transmission ratio can also be selected. A correction or readjustment can advantageously continue to be done manually, for example in a zero position. Further education may also be provided to move the work area in particular electrically. Thus, for example, the operator can compensate for a knife wear and gets on the basis of the correction, a prognosis for the remaining life of the colorimeter.

The storage of the ink fountain can be done for example on the side walls or on auxiliary side racks of the printing unit. The storage of the ink fountain can take place in addition education on support bearings on a arranged between the side walls Traverse. About this bending of the ink fountain by means of biasing is greatly reduced. In addition, minimization of deflection can be achieved by a ribbed shape of the paint box. Further education is no Seilumschlingung around the ductor intended for fixing the ink fountain on the ductor.

In a preferred embodiment, the layer thickness can be changed in the roller mill without printing or new infeed. For example, the time of blanket washing is sufficient. Advantageously, each order change can be implemented with up to 100 startup or waste paper sheets. In one development, the creation and use of a database is preferably provided per color, with which the required waste sheets can be reduced to up to 50 sheets when changing jobs. Alternatively or additionally, a job change with an integrated layer thickness measurement is provided, by means of which the required waste sheets can be reduced to up to 10 sheets. For example, this can be done on the pressure plate or the last distribution cylinder. In addition, changes in the pre-humidification and / or pressure adjustment can be performed.

Advantageously, the calculation can be simplified with the condition that it is only necessary to determine the color gap. Preset data calculations become simpler and much more accurate. This makes self-learning databases feasible. Different correction curves for different color series and substrates can be created. Further advantageously, more rolls can be used due to the gained speed in the lower part of the inking unit. This reduces strip sensitivity and ghosting. However, disturbing water stencils are thus unavoidable. Next, a better tightness of the system can be ensured.

• 1: Druckwerk einer Bogendruckmaschine mit einem einem Plattenzylinder zugeordneten Walzenstuhl;
• 2: Ausschnitt des Druckwerkes mit Farbkasten;
• 3: Draufsicht auf den Farbkasten.

In the following, the invention will be explained by way of example. The accompanying drawings show schematically:

• 1 : Printing unit of a sheet-fed printing machine with a roller mill associated with a plate cylinder;
• 2 : Detail of the printing unit with color box;
• 3 Image: Top view on the color box.

The 1 shows, for example, a printing unit 1 for a printing press, for example a web-fed printing press or a sheet-fed printing press, in particular for a sheetfed offset rotary printing press, preferably in aggregate and series construction. The printing unit 1 includes a via a drive wheel train or individually driven plate cylinder 2 that with a blanket cylinder 3 in contact. The plate cylinder 2 and the rubber cylinder 3 are shown here simply large, each with a cylinder channel. In the cylinder channel is the plate cylinder 2 a pressure plate and the rubber cylinder 3 a rubber blanket attached. The printing plates are changed at defined intervals for each new print job and the blankets. Between different print jobs, the blankets are washed. But there may also be other cylinder sizes, cylinder arrangements or cylinder numbers in the printing unit 1 be used.

The rubber cylinder 3 can also be driven individually, but is preferably driven by the continuous drive wheel train, in particular gear train, the machine. The continuous drive wheel train is moved by a main drive or by several motors feeding at different points of the drive wheel train. Both plate cylinder 2 as well as rubber cylinders 3 each have on both sides arranged not shown bearer rings on. The printing press also has not shown Bedruckstoffführungselemente, in particular sheet guiding cylinder on. Sheet guiding cylinders, for example, guide sheets with leading edge grippers clamped during their rotational movement through the printing press. Between the sheet guiding cylinders, the sheets are transferred in the gripper closure. The rubber cylinder 3 forms here with a trained as a printing cylinder sheet guiding cylinder a printing nip in which a respective sheet is printed.

The printing unit 1 Also includes a roller mill with cooperating rollers for transferring in an ink fountain 4 located medium, in particular of printing ink 5 , to the plate cylinder 2 , In the illustrated printing unit 1 is a color box 4 with a color ductor 6 (Also called ink fountain roller), arranged with a radially displaceable mounted and preferably provided with a rubber coating first roller 7.1 the roll chair cooperates. The color ductor 6 may be driven by the drive wheel train, wherein a clutch is to be provided so that upon reverse rotation of the machine is not the ink 5 uncontrolled from the color box 4 is encouraged. The ink fountain roller is preferred 6 driven by a separate drive, such as an auxiliary drive or a self-propelled.

The first roller 7.1 the roller mill is preferably mounted so as to be radially displaceable by means of a tilt linkage displaceable by an actuator, and is preferably arranged between a first position in which the latter is the ink ductor 6 and a subordinate roller 7.2 contacted the roller mill, and a second position in which this only the downstream roller 7.2 contacted the roller chair, relocatable. In particular, the first roller 7.1 the roller mill in exactly these two positions displaced. A shift of the first roller 7.1 takes place for color separation or for adjusting the color flow of the ink fountain roller 6 to the downstream roller 7.2 of the roller mill, as no ink lifter in the printing unit 1 or is provided in the roll mill. In particular, a displacement of the first roller takes place 7.1 for interrupting the ink supply at a stop of the printing process but preferably also for Farbschichtdickenvoreinstellung for a new print motif or for timing the arrival or Abstellposition with very little ink consumption. This will cause excessive emulsification of the ink 5 in the color box 4 avoided. The roller mill of the printing unit 1 preferably contains other known traversing or iridescent friction or traversing rollers which the printing ink 5 distribute evenly in the inking unit.

Preferably, the second roller is 7.2 the roller mill with a third roller 7.3 and this with a first distributor roller 8.1 the roller chair in contact. The first distributor roller 8.1 stands with a first inking roller 9.1 and particularly preferably with a second inking roller 9.2 in surface contact. The first distributor roller is preferred 8.1 with a fourth roller 7.4 in contact with a not further designated fifth roller and this in turn with a sixth roller in contact. The sixth roller preferably has a second distributor roller 8.2 in contact. The second distributor roller 8.2 is preferably with a third inking roller 9.3 and particularly preferably with a fourth inking roller 9.4 in contact. Between the second inking roller 9.2 and third inking roller 9.3 in the direction of rotation of the plate cylinder 2 can see another example, switchable both inking rollers 9.2 . 9.3 contacting roller may be provided. Also the fourth inking roller 9.4 can be assigned to another roller. Alternatively, also the second roller 7.2 with the omission of the third roller 7.3 directly to the fourth roller 7.4 be assigned.

The inking rollers 9.1 . 9.2 . 9.3 . 9.4 of the roll mill stand during the printing process with the on the plate cylinder 2 clamped pressure plate in contact and transfer the ink 5 to this. The inking rollers 9.1 . 9.2 . 9.3 . 9.4 are from the plate cylinder 2 Abstellbar executed. The color transfer rollers, the two distributor rollers 8.1 . 8.2 and the inking rollers 9.1 . 9.2 . 9.3 . 9.4 in particular are driven centrally by the drive wheel train. But the rollers of the roller mill can also be spun off the drive wheel train.

The printing unit 1 may further comprise a dampening unit, which a dampening solution and a fountain dipping into the dampening solution 10.1 may contain. The dampening solution is from the dampening ductor 10.1 via a dampening roller 10.2 to one with the plate cylinder 2 in contact dampening roller 10.3 transfer. Between the dampening unit and the rollers of the roller mill of the inking unit, a bridge roller 11 be provided, which preferably depending on the condition of the first inking roller 9.1 , the dampening roller 10.3 or to the inking roller 9.1 and the dampening roller 10.3 can be hired. The printing unit 1 But could also be formed without dampening or printing. Both the color ductor 6 as well as the dampening ductor 10.1 In this case, in each case, in particular, a separate drive is assigned to the rotary drive in the printing operation. These drives are designed here in particular as individual drives, each driving only the corresponding roller rotationally. The individual drives can also drive the rollers by means of transmission gears. In printing operation, the ink ductor 6 each at machine speed, ie at a peripheral speed not slower than the peripheral speed of the first roller 7.1 of the roller mill, driven. The peripheral speed of the ink fountain roller 6 may for example equal to the peripheral speed of the first roller 7.1 be the roll chair.

The 2 shows the color box 4 with assigned ink ductor 6 in the printing unit 1 , wherein the first roller 7.1 of the roller mill in one of the ink ductor 6 Remote position is placed, in which the color flow from the ink fountain roller 6 to the first roller 7.1 and thus on to the downstream second roller 7.2 the roll chair is interrupted. The first roller 7.1 stands still with the downstream roller 7.2 in surface contact. In a second position shown in dashed lines is the first roller 7.1 both on the ink ductor 6 as well as on the downstream roller 7.2 employed for color transfer. The color box 4 is about one or more pivot bearings 12 opposite one between the side walls of the printing unit 1 arranged traverse 13 rotatably or pivotally mounted. In this case, in particular over the machine width several pivot bearings 12 of the color box 4 opposite the crossbar 13 intended.

The color box 4 contains a housing and a reservoir for the medium, in particular the printing ink 5 , Among other things, the reservoir is held by a housing with the ink ductor 6 a gap S forming colorimeter 14 and from laterally arranged paint jaws 15 educated. The colorimeter 14 extends in particular over the color box width or is carried out over. The attachment of the colorimeter 14 allows in particular a strong thermal expansion. Further education can the colorimeter 14 also have a temperature. The color baking 15 are preferred on the colorimeter 14 mounted upright. The attachment of the color baking 15 limits the extent of the colorimeter 14 not so. A tempering of the colorimeter 14 For example, below the colorimeter 14 in the area of the ink ductor 6 be provided.

Inside the color box 4 is preferably a number of metering levers 16 arranged, which each have a pivot point 17 stored and are rotatable about this. In particular, a plurality of metering levers 16 provided over the machine width, which each have a parallel to the axis of rotation of the ink fountain roller 6 arranged pivot point 17 can be twisted. On the side of the ink ductor 6 the dosing levers work 16 with the colorimeter 14 to adjust or change the between the colorimeter 14 and the ink ductor 6 formed gap S together. For zonal adjustment of the gap S an actuation of the individual metering lever 16 , which each against the colorimeter 14 Press, thereby causing the zonal deformation of the colorimeter 14 comes. The colorimeter is preferred 14 under every color baking 15 supported by an adjustable in a so-called zero position support lever.

Several or all, for example, arranged between outer support levers Dosierhebeln 16 is on the of the colorimeter 14 opposite side of an actuator 18 assigned. A respective actuator 18 acts on a first between the actuator 18 and the fulcrum 17 trained first lever length of the metering lever 16 , Next has a respective metering lever 16 one between the fulcrum 17 and the contact point to the colorimeter 14 formed second lever length. Preference is given to a by the actuator 18 actuated travel of up to 2 mm and one of the dosing lever 16 transferred work path of 3 to 30 microns provided. It can be a ratio between travel and travel be achieved over the ratio of the first lever length to the second lever length of at least approximately 66 to 1. Further education is a wear adjustment of the colorimeter 14 over the dosing lever 16 intended. Also, external fixed support lever can be designed to be readjustable. For example, the actuators 18 be designed as servo motors, wherein a travel of, for example, 2 mm can also be divided electronically. In this case, the first parts are provided for a wear adjustment, and this may also be assigned to a further actuating unit. Of the remaining parts, a predetermined part, for example 1 mm, is divided into 100 setting steps. This area is used for the actual setting and its compensation. This adjustment and compensation range can vary depending on the required gap strength S in particular to move the remaining parts electronically. For example, a control range of the actuator 18 of 0.5 mm, for example, for compensation and 0.5 mm for wear adjustment. An adjustment or adjustment of the working range of an actuator 18 can for example via a set screw 22 carried out, including a motor adjustment 23 can be provided.

The 3 shows a plan view of the ink fountain 4 , The laterally arranged especially on the colorimeter 14 standing paint jaws 15 make up with the colorimeter 14 the reservoir, being between the Farbduktor 6 and the colorimeter 14 the gap S is formed. In the color box 4 below the colorimeter 14 The metering levers are not visible over the color box width 16 arranged side by side, wherein the respective actuator 18 the gap S over the dosing lever 16 is set. The aim is the adjustability of the gap S permanently preserved from 3 to 30 μm. Expected disturbances for the splitting accuracy must be compensated. This can be a knife wear by an automatic adjustment, a manual zeroing and / or by a new bevel of the colorimeter 14 be at least partially compensated. A deflection can, for example, by an additional support on the traverse 13 and / or a compensation program can be prevented. A speed change can also be compensated by a compensation program. Next, changes in color, such. As the level or the viscosity can be compensated by a scheme. For example, a color preset by subject can be done by a database.

The ink fountain is preferred 4 between the side frames of the printing unit 1 directly on the side walls or on auxiliary side frames on both sides 19 supported. In this case, there is a lateral support of the ink fountain 4 also via pivot bearings 12 opposite to both lateral auxiliary side racks 19 , The between the side pivot bearings 12 provided pivot bearing 12 , which on the not shown lower traverse 13 attack, are not shown, but can have an adjustable preload and the forces on the traverse 13 transferred to the side walls of the machine. The pivot bearings 12 of the color box 4 are arranged concentrically to each other, so that the color box 4 around those of the pivot stores 12 formed axis is pivotable. The color box 4 are additional second supports 20 spaced from the pivot bearings 12 assigned, which also on both sides firmly on the side walls and the auxiliary side racks 19 are stored. Rotatable on both sides of the ink fountain 4 arranged closing lever 21 is the color box 4 in its working position compared to the frame-fixed second supports 20 lockable.

For mode of action: Preferably, a precise dosage of the color decrease takes place via the gap S through each one metering lever 16 actuating preferably electric actuators 18 , In particular, one or each actuator 18 an adjusting element, in particular an adjusting spindle or adjusting screw 22 , be assigned to the displacement of the work area ie a shift of the travel. The adjusting spindle or set screw 22 may preferably be provided for coarse range shift realized by the electric actuator travel. A fine adjustment including the compensation is done by means of the travel of 2 mm (for example in 400 steps), preferably in the transmission ratio 66 to 1 So 0.0124 microns per step of the actuator 18 ,

The working range of a respective dosing lever 16 is in particular to the printing ink to be printed 5 customized. For example, the processing of certain inks 5 (eg blue, brown, reflex blue or yellow) have a higher layer thickness than the processing of other printing inks 5 (eg, cyan, magenta, or lightened colors). To this ever ink 5 slightly different gap thickness S The operating ranges of the actuators will be stable 18 in particular divided into electronically adjustable and expandable parts. In addition, the "zero setting" can be adjusted mechanically and / or electrically. The expected gap changes caused by the speed change of the machine are preferably determined. These changes are then made by a compensation program from the actuator 18 automatically balanced in his workspace. A wear of the colorimeter 14 is further compensated by adjusting the zero position. In this case, the remaining travel is preferably displayed on the control console. This is a necessary Replacing the worn colorimeter 14 easy to plan.

Further, in areas where no ink is consumed, it is preferable that this zone is not closed to 0 (3 μm) but only slightly reduced below the ink layer thickness prevailing in the upper part of the inking rollers. This can be calculated, for example, if the target thickness for this color on the sheet is known. This prevents the color brought out by the rubbing process from being too much into the ink fountain 4 is returned. When the ink flow rate in the inking unit decreases due to a small amount of consumption on the overall sheet, the emulsification increases at the same time. To avoid this increased water content unnecessary in the ink fountain 4 For example, at a color consumption of less than 5%, the first roller is returned 7.1 as metering roller from the ink ductor 6 disconnected during production. This interval depends on the ink consumption of the entire sheet and the storage volume of the rollers of the roller mill.

• - Farbprofilumstellung ohne Druckprozess -> Walze 7.1 wird angestellt;
• - Druckunterbrechung -> Walze 7.1 wird abgestellt;
• - Druckprozess mit Flächendeckung > 50% -> Walze 7.1 wird 100% angestellt;
• - Druckprozess mit Flächendeckung 30% bis 50% -> Walze 7.1 wird 90% angestellt und 10% abgestellt;
• - Druckprozess mit Flächendeckung 20% bis 30% -> Walze 7.1 wird 80% angestellt und 20% abgestellt;
• - Druckprozess mit Flächendeckung 10% bis 20% -> Walze 7.1 wird 70% angestellt und 30% abgestellt;
• - Druckprozess mit Flächendeckung 5% bis 10% -> Walze 7.1 wird 60% angestellt und 40% abgestellt;
• - Druckprozess mit Flächendeckung 2% bis 5% -> Walze 7.1 wird 10% angestellt und 90% abgestellt;
• - Druckprozess mit Flächendeckung < 2% -> Walze 7.1 wird 5% angestellt und 95% abgestellt.

In order to avoid excessive emulsification in the dosing range at very low ink consumption, a program preferably adopts the switching of the first roller 7.1 of the roller mill. In addition to the task (printing process, print interruption, ink run-in and color profile changeover), the area coverage of the current printing form and the storage volume of the inking unit are available to the program as known input variables. The program can do the roller 7.1 put so:

• - Color profile conversion without printing process -> roller 7.1 is hired;
• - Print interruption -> roller 7.1 is turned off;
• - Printing process with area coverage> 50% -> roller 7.1 is 100% hired;
• - Printing process with area coverage 30% to 50% -> roller 7.1 90% is hired and 10% turned off;
• - Printing process with area coverage 20% to 30% -> roller 7.1 80% is hired and 20% off;
• - Printing process with area coverage 10% to 20% -> roller 7.1 70% is hired and 30% turned off;
• - Printing process with area coverage 5% to 10% -> roller 7.1 is 60% hired and 40% turned off;
• - Printing process with area coverage 2% to 5% -> roller 7.1 10% is hired and 90% turned off;
• - Printing process with area coverage <2% -> roller 7.1 5% is hired and 95% turned off.

However, these values merely represent exemplary interpolation points between which an interpolation, for example via a formula or a shift, can take place.

Alternatively, for example, even with a decrease in color of 5% on the overall sheet, the first roller 7.1 during two complete plate cylinder revolutions in contact with the ink fountain roller 6 and then be separated for at least approximately ten plate cylinder revolutions of this. At 2% decrease in color on the overall sheet may be the first roller 7.1 correspondingly during two complete plate cylinder revolutions in contact with the ink fountain roller 6 and then be separated for at least approximately fifty plate cylinder revolutions thereof. At 1% decrease in color on the overall sheet may be the first roller 7.1 correspondingly during two complete plate cylinder revolutions in contact with the ink fountain roller 6 and then be separated for at least approximately one hundred plate cylinder revolutions of this. In addition, a color bridge can also be connected in an interval, that is, switched off or brought into contact. A color separation during a production interruption remains unaffected by the interval circuit.

LIST OF REFERENCE NUMBERS

1

printing unit

2

plate cylinder

3

rubber cylinder

4

paintbox

5

printing ink

6

ink fountain roller

7.1

first displaceable roller

7.2

second roller

7.3

third roller

7.4

fourth roller

8.1

Verreiberwalze

8.2

Verreiberwalze

9.1

Inking roller

9.2

Inking roller

9.3

Inking roller

9.4

Inking roller

10.1

dampening ductor

10.2

Pan roll

10.3

Dampener roller

11

bridge roller

12

pivot bearing

13

traverse

14

colorimeter

15

color jaws

16

apportioning

17

pivot point

18

actuator

19

Auxiliary side frame

20

second support

21

closing lever

22

screw

23

motor adjustment

S

gap

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10020510 A1 [0005]
• DE 102013225691 A1 [0006]
• DE 102007003943 A1 [0012]

Claims (10)

Printing unit of a printing machine, in particular a sheet-fed offset rotary printing press in aggregate and series construction, with a forme cylinder (2) and a roller mill, wherein the roller mill with the forme cylinder (2) can be brought into contact applicator rollers (9.1, 9.2, 9.3, 9.4) and further with the applicator rollers (9.1, 9.2, 9.3, 9.4) in contact rollers (7.1, 7.2, 7.3, 7.4, 8.1 , 8.2), wherein at least one of the rollers is formed as Verreiberwalze (8.1, 8.2), wherein an ink duct (4) cooperating with a ductor (6) is provided, wherein the ductor (6) cooperates with a radially displaceable first roller (7.1) of the roller mill, wherein the ductor (6) is driven with at least approximately machine speed, wherein the ink fountain (4) has a color knife (14) which has an adjustable gap (S) to the ductor (6) and wherein at least one metering lever (16) for changing the gap (S) is provided. Printing unit after Claim 1 , wherein the ductor (6) with a ceramic coating and / or the first roller (7.1) of the roller mill is provided with a rubber coating. Printing unit after Claim 1 or 2 , wherein the ductor (6) can be driven in rotation by a separate drive or can be coupled to a drive wheel train of the printing press for forward movement. Printing unit after Claim 1 . 2 or 3 , wherein the first roller (7.1) of the roller mill for displacing a contact to the ductor (6) about the contact zone to a downstream roller (7.2) of the roller mill is arranged displaceably. Printing unit after Claim 1 . 2 . 3 or 4 in which the gap (S) formed between the ink knife (14) and the ductor (6) is between 3 and 30 μm. Printing unit after Claim 1 . 2 . 3 . 4 or 5 , wherein the ink knife (14) of the ink fountain (4) consists of spring steel and / or slotted continuously or by laser and / or has a temperature. Printing unit after Claim 1 . 2 . 3 . 4 . 5 or 6 in which the at least one metering lever (16) is rotatably mounted about a pivot point (17) arranged in the ink fountain (4) and the ink blade (14) for adjusting the gap (S) with respect to the ductor (6) during rotation about the pivot point (17) ) relocated. Printing unit after Claim 1 . 2 . 3 . 4 . 5 . 6 or 7 wherein the metering lever (16) has a first lever length between an actuator (18) and a pivot point (17) and a second lever length between the pivot point (17) and a contact point to the ink knife (14), wherein in particular a transmission ratio of first lever length to second lever length is at least approximately 66 to 1. Printing unit after Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 or 8th , wherein over the format width a number of Dosierhebeln (16) is provided, which act on an over-wide colorimeter (14) for zonal adjustment of the gap (S) and which are actuated separately by actuators (18). Method for operating a printing unit of a printing press with a forme cylinder (2) and a roller mill, in particular according to one of the preceding claims, wherein the roller mill with the forme cylinder (2) in contact applicator rollers (9.1, 9.2, 9.3, 9.4) and further with the applicator rollers (9.1, 9.2, 9.3, 9.4) in contact rollers (7.1, 7.2, 7.3, 7.4, 8.1 , 8.2), wherein at least one of the rollers is operated as a distributor roller (8.1, 8.2), wherein an ink fountain (4) cooperating with a ductor (6) is provided, wherein the ductor (6) cooperates with a radially displaceable first roller (7.1) of the roller mill, wherein the ductor (6) is driven at at least approximately machine speed, wherein the ink fountain (4) has a color knife (14), which has a via at least one metering lever (16) adjustable gap (S) to the ductor (6) and wherein compensating means are provided which, upon a change in rotational speed on the printing machine, determine an expected gap change and determine compensation values and these at a speed change of the printing machine to compensate for the bending of the ink fountain (4) and / or the ink knife (14) of the ink fountain (4) via the at least one metering lever (16) brings to the application.

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