EP1717032B1 - Printing group with device for applying lubricant - Google Patents

Abstract

A printing unit includes a pneumatic cylinder (1), color printing cylinders (4-6), a pair of lubricant pipes (8), and a detergent pipe (7). The lubricant pipes spray lubricant such as oil or water into some of the printing cylinders, aside from moistening the same cylinders with detergent sprayed from the detergent pipe. An independent claim is also included for a printing method.

Description

The invention relates to the auxiliary lubrication in printing units of rotary printing machines, preferably web-fed rotary printing machines. In particular, it also relates to offset printing. A preferred field of application is the newspaper printing and here preferably the printing of large newspaper editions. It can be advantageously used for printing with dampening solution, but also for printing without dampening solution.

Due to the ever-increasing use of printing machines for products with different formats and the meanwhile far more freely available random printing cylinders with axially juxtaposed printing plates, occurs more often the case that parts of the printing cylinder is not needed for printing and thus during the printing process with paper are occupied, for example, if only one-quarter, half or three-quarters lanes are driven. In the unused areas of the form cylinder is parked by the inking and dampening unit, if it is not covered with blanking plates. Ink and moisture cylinders run virtually dry in this area (s), as they are not wetted with paint or fountain solution in this area (s).

While in areas in which printing plates or blanking plates are applied to the printing cylinder, the lubrication of the inking and / or dampening rollers on the ink or fountain solution supply, which cooperating with unused cylinder parts sections of the ink rollers are not wetted. The absence of liquid in these areas leads to dry running in the corresponding ink roller sections. This in turn leads to increased friction values and thereby local increase of the roll temperature. As a result, the life of the ink rollers is considerably shortened. It can lead to malfunctions and significant damage to the printing press. The consequences are interruptions of production, downtime and increased repair costs.

It is common practice today to prevent dry running by applying a lubricant, for example by-pass oil, by-pass paste or by-pass spray, by the operating personnel by hand to the dry-running roller sections. For this purpose, the printing unit protection devices must be opened, which inevitably leads to a machine stop. To open the printing mechanism protection device, the printing press must first be slowed down from the printing speed to the service speed, which means further loss of time and keeps the operator away from other tasks. After application of the by-pass agent by hand, a restart of the printing machine with all its risks is necessary.

The EP 1 442 884 A1 discloses a device by means of which a non-flowing medium, for example commercially available roller paste or roller grease, is finely distributed to the dry areas of a cylinder or a roller in the inking or dampening unit by means of blown air.

It is an object of the invention, without disturbing the printing process, to apply a friction-reducing liquid to dry rotating bodies.

The invention relates to rotary printing machines with at least one printing unit, consisting of at least one printing cylinder and an inking unit for printing endless webs or sheets. Preferably, the printing unit further comprises a printing house's own detergent application device. If the printing unit works as preferred with dampening solution, as is the case in particular in wet offset printing, the dampening cylinder is also associated with a dampening unit, preferably a dampening unit operating with at least one dampening roller, by means of which the dampening solution is supplied to the printing cylinder.

The object is achieved by the invention by the printing unit (s) is / are equipped with a device that allows the exact application of a lubricant in the range of dry rotating body sections without interrupting the production process. If the printing unit has its own detergent application device, the lubricant application device is additionally provided for this purpose. If the printing unit comprises a dampening unit, the lubricant application device is provided in addition to the dampening unit, but can use the dampening unit for the application of the lubricant, such that the lubricant is transferred separately from the dampening solution via one or more components of the dampening unit, in particular dampening roller (s) becomes. The lubricant is a liquid which is preferably different from a washing liquid as used for conventional printing machine washing. In principle, the usual dampening solution could be used as the lubricant, but preferably the lubricant also differs from the dampening solution. In the particularly preferred type of machine, a wet offset web-fed rotary printing press, a liquid which differs from both the washing liquid of the detergent application device and the dampening solution of the dampening system is thus used as the lubricant in a preferred embodiment.

In preferred embodiments, the lubricant applicator comprises a system of e.g. Tubes which, starting from a reservoir and guided by at least one pump, are installed in the printing unit in such a way that along the outer surface of the shell of at least one body of the printing unit, e.g. an inking roller, a dampening roller or the printing cylinder, at least one tube of the applicator extends. This tube is e.g. provided with bores which form outlet openings for the lubricant. In or at the outlet openings can be introduced nozzles for fine atomization of the lubricant.

The application of the lubricant can be carried out in time intervals, continuously or pulsating, it is preferred a continuous application of the lubricant. The lubricant can be sprayed onto the dry rotating body section (s) under pressure, dripped by gravity or applied in another suitable manner.

The applicator preferably comprises at least one pump, preferably a separate pump. This pump can be integrated in the control of the printing press, so that no lubricant is conveyed when the machine is at a standstill, during set-up and during emergency stop. When starting the printing machine and the production pressure, the lubricant is pumped by the pump and can be applied through the holes / nozzles or other facilities on the dry running sections / zones of a rotating body.
Zones designate the parts of the printing cylinder across its axial width which can be covered by a printing plate. Sections are parts of the cylinder which are larger or smaller than a zone but which may comprise zones entirely or in part.

The regulation of the delivery amount of the lubricant per unit time can be made for example by the surgeon by manual input according to experience before each printing, or be determined electronically, order quantity and / or order intervals being dependent on the conditions prevailing on the rollers, such as temperature and running speed. These conditions can be either the regulation in a model that is created on the basis of theoretical considerations or actual measurements on the machine, be given, but it is also possible to tap the current conditions prevailing on the rollers actual conditions using appropriate measuring devices currently, and the like obtained data to use as output data for a scheme.

Since the lubrication by means of the lubricant application device should only come into play at the points of rotation body, where no lubrication takes place by the inking and / or dampening, d. H. Sections of the cylinder, which have no pressure plate and no blank plate and in which no paper is running, advantageously allows the application device to selectively lubricate only individual zones or sections on the rotation body. This can be achieved in a device consisting of a pipe in that each individual outlet opening can be opened and closed independently of the other outlet openings. Thus, sections of any width can be sprayed specifically with lubricant, and it can be reacted to any document situation on the cylinder. Preferably, a plurality of parallel tubes may be provided, each lubricating only a certain zone, for example, per printing plate width, i. per zone, one tube. In this case, built into the device after the pump advantageously built-way valves, which is applied to the tubes each alone or together with each other of the tubes with the lubricant. That is, it may be at a e.g. four-zone wide cylinders are lubricated either just any zone, or two or three arbitrarily combinable zones simultaneously.

The valves may be bi-directional actuators which are switchable between closed position and open position, but also continuously variable fluidic actuators or multiway actuators with more than two switch positions. The valves can be controlled and switched electrically, magnetically or pneumatically.

In a less preferred variant, along the rotational body over its width, movably mounted pipe sections can form the lubricant application device. These can be selected by the operator manually or by the control of the press automatically, For example, by optical scanning on the surface of the printing cylinder depending on the width, the paper roll clamped for production, are moved axially.

Also in the tubes arranged, transversely to the longitudinal axis of the rotary body pivotable spray nozzles can serve for lubrication in the dry-running area. You can reliably spray small sections, their swivel range can be adjustable according to the rotating body section to be covered. The disadvantage here is that when using multiple pivoting nozzles it can lead to overlapping areas, and the order quantity per cylinder surface unit decreases when pivoting with increasing pivot angle. Also conceivable, although less preferred due to its randomized accuracy, is lubrication of the dry-running areas via e.g. Brush rollers or transfer rollers, as they are basically known from dampening.

The lubricant applicator can be introduced into the printing unit at any point where installation of the spray pipes is possible and useful. It is preferred that it runs in the axial direction along the inking rollers and / or inking rollers. In this case, the lubricant application device may be arranged to the inking rollers that they simultaneously or reversibly an inking roller and / or an inking roller, or one or more of the inking rollers can apply lubricant. In this case, the lubricant is preferably applied to a roller having the same direction of rotation as the forme cylinder, or to a roller of the inking or dampening unit, which is arranged between two other rollers, and having a direction of rotation, so that they after application of the lubricant forms the next gap with the roller lying in the direction of the forme cylinder.

If the printing machine has an automatic cylinder washing device, then a preferred solution is to guide the supply (s) of the lubricating fluid along the tube body (s) of the washing system through the printing unit, at least along or the rotary body (s), onto the or which directly applies the application device. This is particularly useful in cases where a printing unit with integrated washing device to be retrofitted to a device for applying lubricant according to the invention. Construction conditions on the printing press can also locally independent, separate arrangements of the feeders of the detergent applicator and the lubricant applicator condition.

An automatic cylinder washing device washes both ink residue and applied lubricant from the cylinders in a printing machine having a lubricant applicator. The detergent, which is sprayed onto the cylinders by means of the detergent applicator, passes through the roller mill and mixes with the paint residues and the lubricant. This mixture is collected at the lower end of the roll mill and passed into a tank. From there it can be disposed of or partially re-used, partially recovered or otherwise treated.

During the washing process, the mixture of detergent, paint and lubricant is scraped off or pulled off at the bottom roller. If it is intended to wash the dampening unit, the plate cylinder for the washing process by the printing cylinder and thus also by the dampening unit is turned off.

Installation of the device can optionally be done per inking unit, per bridge below, per bridge above, per printing unit, per 8-tower, per 12-tower, per section or per machine as required. In this case, a lubricant-conveying pump can be designed as a central pump, so that a single pump supplies the device for applying the Nebenlaufmittels only for a single printing unit, for the whole tower, for a bridge, for a section or for the entire printing machine with lubricant. The targeted control of the currently required pipes for the application of the lubricant then takes place through the associated valves.

To avoid the disadvantages of a central pump, a separate pump can also be provided for each section to be sprayed. However, the then required large number of pumps higher costs and increased space requirements.

It is quite possible to use instead of the previously mentioned pipes in the device according to the invention flexible hoses or other suitable hollow body for transporting the lubricating fluid from the reservoir to the spray nozzles. It is also conceivable to associate each outlet with its own reservoir, as well as the reservoir in this case itself as an applicator device, in which case a pump located in the reservoir could provide the necessary pressure, or the reservoir is pressurized with, for example, pneumatic pressure, which in turn affects the amount of lubricant dispensed through the outlet ports.

The lubricating or Nebenlaufmittel may differ in composition and effect of the guided in the cylinder washing liquid. It is then advantageous that both fluids have their own reservoir and not the same lines are used. In this case, it is particularly advantageous if both devices have their own pump unit. If a liquid is suitable for both tasks, lubrication and washing, it will suffice or suffice for a reservoir, a pump and possibly a pipe system.

It is the task of the lubricant with complete wetting of a dry rotary body section to give it a largely, preferably exactly the same physical running behavior, as have the wetted by color and / or dampening sections / zones of the rotating body. This increases the service life of the rotary bodies and reduces production interruptions due to dry running damage. An automatic application of the lubricant also has the advantage that the surgeon can take on other tasks, an assistant may be saved.

The printing unit may further comprise a dampening unit, which provides the non-printing elements of the printing plate and the dummy plates, but not the dry-running ink roller sections, with a thin fountain solution film. Feeding dampening solution is necessary in wet offset printing. In the newspaper opening pressure, the expert distinguishes between centrifugal, turbo or brush dampening units that manage without a pump and spray dampening units with spray nozzles.

In the event that a single liquid can perform both the task of the auxiliary lubrication and the dampening unit, it is in the context of the invention that both systems can be combined, and then the common line system fluid in different intensity from a common reservoir the inking and dampening rollers are sprayed on, for example. The in the field of printing plates and / or blank plates lying zones of the dampening rollers are sprayed with the amount of fluid that corresponds to the previously supplied by the dampening unit amount lying outside the paper web ink roller sections for the purpose of lubrication with eg more fluid.

Should a liquid be suitable to meet the requirements of the auxiliary lubrication, the dampening unit and the cylinder washing device, only one reservoir, a piping system and an applicator can be provided for all three tasks.

Figur 1

eine Schnittdarstellung eines Druckwerks mit einem Formzylinder, der eine Druckform trägt,

Figur 2

eine Schnittdarstellung des Druckwerks in einer druckformfreien Zone,

Figur 3

eine Draufsicht auf den Formzylinder, der nur auf einer Hälfte mit einer Druckform belegt ist, und einer Farbe auf die Druckform übertragenden Farbwalze,

Figur 4

eine exemplarische Anordnung der Rohrleitungen von Waschvorrichtung und Nebenlaufschmierung,

Figur 5

eine schematische Darstellung der Nebenlaufschmiervorrichtung und

Figur 6

eine perspektivische Ansicht der Nebenlaufschmiervorrichtung.

An embodiment of the invention will be explained below with reference to figures. The features disclosed in the exemplary embodiments each individually and in each combination of features advantageously further extend the subjects of the claims and the embodiments described above. Show it:

FIG. 1

a sectional view of a printing unit with a form cylinder which carries a printing form,

FIG. 2

a sectional view of the printing unit in a pressure-free zone,

FIG. 3

a plan view of the forme cylinder, which is occupied only on one half with a printing plate, and a color on the printing form transmitting ink roller,

FIG. 4

an exemplary arrangement of the tubing of washing device and auxiliary lubrication,

FIG. 5

a schematic representation of the auxiliary lubrication device and

FIG. 6

a perspective view of the auxiliary lubrication device.

FIG. 1 shows a printing unit with an inking unit, a dampening unit and two printing cylinders 1 and 2. The printing cylinder 1 is a forme cylinder, and the printing cylinder 2 is a blanket cylinder which receives the print image from the printing cylinder 1 and prints on a web. The printing cylinder 1 can be covered over its axial width with several printing plates (blanking or blanking plates). The section through the arrangement in a region in which the printing cylinder 1 is covered with a printing form 3 can be seen. At the level of the inking unit and axially along the ink rollers, a support structure 17 is arranged, which carries three tubes. The middle tube 7 is the spray tube of a washing device by means of which detergent can be applied to the inking rollers. The above and below shown tubes 8 are tubes of the lubricant application device, by means of which a lubricant can be applied to the ink rollers. The tubes 8, as shown, at the same time act on an inking roller 5 and a ink transfer roller 4 with lubricant. It is also possible that the tubes 8 act together on one of the ink rollers 4, 5, or that only one of the tubes 8 acts on only one of the ink rollers 4, 5, or that one of the tubes 8 two or more ink rollers with lubricant applied.

It will, as in the FIG. 1 can be clearly seen, each color rollers applied with lubricant, which are arranged between two other rollers of the inking unit. In this case, one of the two rolls is seen in the direction of the forme cylinder 1 before (upward), the other behind (down) of the applied directly from the lubricant means with lubricant ink roller 4, 5. Two of the rollers form a gap with each other. It is preferred if the direction of rotation of the inking roller 4, 5 is directed so that it forms a gap after application of the lubricant next with an upward, for example, the roller 6. Will the inking as in the FIG. 1 If the lubricant supply device is arranged on the opposite side of the inking unit, the direction of rotation of the inking roller 4, 5 would be opposite to the direction of rotation of the forme cylinder 1, that is to say the direction of rotation of the inking roller 4, 5 is equal to that of the printing cylinder 1 other rolls that meet the conditions defined above would be directly lubricated. The in the FIG. 1 lubricated rollers 4, 5 are exemplary of any other possible roller of the inking unit.

Another, in FIG. 1 not shown possibility is to apply in addition to the inking and rolling of the dampening partially or completely with lubricant. In this case, the statements made to the inking unit apply accordingly.

FIG. 2 shows the same situation as FIG. 1 , with the difference that the printing cylinder 1 carries no printing plate 3 in the section shown. The printing cylinder 1 has no contact with the inking and / or dampening rollers in this area. This figure illustrates once again that in this zone of the printing cylinder 1 there is no need for color transfer. Consequently, in the inking the color (not shown) screws are closed, which causes no color on the ink rollers 4, 5, 6 is performed, and thereby the Disadvantages of dry running can adjust. Heretofore known manual application of secondary paste, spray or oil can be carried out automatically in the arrangement shown by the lubricant application device.

FIG. 3 shows a plan view of the combination of printing cylinder 1 and ink transfer roller 6. It can be seen that a paper web 9 is driven, which has only half of a possible maximum width. Consequently, the printing cylinder 1 is occupied only in one half with one or more printing plates 3, while the other half carries no printing plate or printing plates 3. In the example, a simple wide pressure cylinder 1 is shown with two pressure zones next to each other. The ink transfer roller 6 has contact only in the area with the printing cylinder 1, on which the printing form 3 sits. Accordingly, only this zone of the ink rollers is wetted with ink and / or fountain solution, the other rolling zones must / must be additionally lubricated.

FIG. 4 shows a possible arrangement of the lubricant applicator 8, 11 and the washing device 7 in a common carrier 17, which is formed in the example as a U-carrier. The lubricant applicator consists of two mutually separate pairs of tubes 8, which are closed at their opposite ends and have outlet openings 11 in the end region. The area of each tube 8 having the outlet openings 11 corresponds to the width of a zone of the pressure cylinder 1. The upper pair of tubes 8 has a large distance between the two opposite ends. These two tubes 8 are suitable for the case as a lubricant application device when the printing cylinder 2 is centrally occupied with paper, but the two outer zones are not used for printing. Accordingly, the lower tubes 8 are active when in addition to or only in the middle of the printing cylinder 1 is a freewheeling zone. Between the two tube pairs 8, the tube of the washing device 7 runs. In order to actually meet every possible situation concerning the dry running on the inking rollers 4, 5, 6, each of the spray tubes 8 is individually switched on and off, so that any Combination of spraying is representable.

Both tube pairs 8 can also be connected to one another in each case to a tube 8, wherein the tube 8 is closed at a location lying between the exit zones. In this case, controlled by valves, the individual order zones can be switched on or off individually and in any combination. Also possible, although less preferred a solution with only a single tube 8, in which case it should be possible to open and close the outlet openings instead of the tube zones.

FIG. 5 shows the structure of the apparatus for lubricating a four-side wide ink roller 5, 6 in otherwise dry running area. The ink roller washing system is also indicated, with only the supply line, the reservoir 18 and the spray tube 7 are shown for the detergent. It can be seen that washing and lubricating devices have independent fluid systems. From the reservoir 15, which is filled with lubricant, the fluid is conveyed by means of a pump 12 to the valves 13. These valves 13 are switched by a controller 14 either automatically by parameters such as web width, optical detection of the dry area on the ink roller 4, 5, 6 or manually by the operator. If they are open, the secondary flow agent can reach the respective tube 8 via the respective feed and lubricate the inking rollers 4, 5 therefrom. Good to recognize that each valve 13 individually controlled, and thus each of the actual situation on the roller 4, 5 adapted spray pattern can be generated. Also visible are the four-parting of the inking roller 4, 5 and the individual quarters associated spray tubes 8, ie zonewise applicability, which is only an example, other, even on much smaller roller sections aligned tubes 8 or individually on and / or disconnectable pipe sections are possible within the scope of the invention.

FIG. 6 shows the side lubrication in a perspective view. You can see again the division of the ink roller 4, 5 in four zones (A, B, C, D), the corresponding arrangement of the tubes 8, the valves 13 and the pump 12. Should the printing cylinder 1 six or eight, or each have any other number of zones that can ever be occupied with printing plates 3 (printing plates and / or blank plates), it is within the meaning of the invention, then assign each of these zones according to a zone applicator 8 for lubrication.

LIST OF REFERENCE NUMBERS

1

form cylinder

2

pressure cylinder

3

Stencils / blind plate

4

transfer roller

5

Ink distributor roller

6

applicator roll

7

Spray tube detergent

8th

Spray tube lubricant

9

Paper web, half cylinder width

10

Side lubrication area

11

Nozzles / bores

12

pump

13

valves

14

control

15

reservoir

16

Wall printing unit

17

support structure

18

reservoir

Claims (23)

1. A printing unit with concurrent lubrication, comprising:

   a) a first rotation body which forms a printing cylinder (1); and

   b) at least a second rotation body which forms an inking roller (4; 5; 6) for the first rotation body;

   c) wherein the printing unit additionally comprises a lubricant applying means (8, 11) using which at least one of the rotation bodies (1; 4; 5; 6) can be wetted with a lubricant in axial sections;
   characterised in that

   d) the lubricant applying means (8, 11) comprises at least one pipe-shaped supply line (8) which runs along the rotation body (4; 5).
2. The device according to claim 1, characterised in that the printing unit optionally comprises a detergent applying means (7) and optionally comprises a dampening unit.
3. The device according to any one of the preceding claims, characterised in that the lubricant applying means (8, 11) is attached to a supporting structure (17) of the detergent applying means (7).
4. The device according to any one of the preceding claims, characterised in that the lubricant applying means (8, 11) is arranged in such a way with respect to the inking roller (4; 5) that the inking roller (4; 5) can be wetted directly with the lubricant by means of the lubricant applying means.
5. The device according to any one of the preceding claims, characterised in that: the printing unit comprises an inking roller (6) which is upstream in relation to the ink transfer, a downstream inking roller and a middle inking roller (4; 5); the middle inking roller (4; 5) forms a gap with each of the upstream inking roller (6) and the downstream inking roller; and a surface region of the middle inking roller (4; 5) which immediately forms the gap with the upstream inking roller (6) in the rotational direction of the middle inking roller (4; 5) can be wetted directly by means of the lubricant applying means (8, 11).
6. The device according to any one of the preceding claims, characterised in that the printing unit comprises an inking unit comprising a number of inking rollers (4; 5; 6) for the printing cylinder (1), and in that the lubricant can be applied to at least two of the inking rollers (4; 5) by means of the lubricant applying means (8, 11).
7. The device according to any one of the preceding claims, characterised in that the dampening unit, if one is provided, comprises at least one dampening roller for the printing cylinder (1), and the lubricant can be applied to the dampening roller by means of the lubricant applying means (8, 11).
8. The device according to any one of the preceding claims, characterised in that the lubricant applying means (8, 11) comprises nozzles (11), which are arranged axially next to each other, for spray-charging the rotation body (4; 5).
9. The device according to any one of the preceding claims, characterised in that the lubricant applying means (8, 11) comprises a reservoir (15) for the lubricant which is separate from the detergent applying means (7) and the dampening unit, if a detergent applying means (7) or a dampening unit is/are provided.
10. The device according to any one of the preceding claims, characterised in that the amount of lubricant supplied to the rotation body (4; 5) by the lubricant applying means (8, 11) is variable, preferably in accordance with the running speed of the machine.
11. The device according to any one of the preceding claims, characterised in that the rotation body (1; 4; 5) comprises axially adjacent zones (3) which are as wide as a printing block, and the lubricant applying means (8, 11) extends over at least one of the zones.
12. The device according to any one of the preceding claims, characterised in that the rotation body (4; 5) comprises axially adjacent zones which are as wide as a printing block, and the lubricant applying means (8, 11) comprises at least one supply line (8) for the lubricant for each zone which is as wide as a printing block.
13. The device according to any one of the preceding claims, characterised in that the lubricant applying means (8, 11) comprises at least two supply lines (8) for the lubricant which the lubricant can optionally flow through.
14. The device according to the preceding claim, characterised in that the lubricant can flow through each of the supply lines (8), independent of any other of the supply lines (8).
15. The device according to the preceding claim, characterised in that the at least one pipe-shaped supply line (8) is closed on the side which faces away from a reservoir (15) assigned to the lubricant applying means (8, 11).
16. The device according to any one of the preceding claims, characterised in that the rotation body (4; 5) comprises axially adjacent zones (3) which are as wide as a printing block, and each of the zones of the rotation body (4; 5) is assigned a lubricant applying means (8, 11), wherein each lubricant applying means (8, 11) can act individually and/or together with any other lubricant applying means (8, 11).
17. The device according to any one of the preceding claims, characterised in that at least one axially outer section and/or an axially middle section of the rotation body (4; 5) can be wetted by means of the lubricant applying means (8, 11).
18. The device according to any one of the preceding claims, characterised in that the width of a section of the lubricant applying means (8, 11) which applies the lubricant corresponds to the width of a section of the printing cylinder (1) on which paper does not run.
19. The device according to any one of the preceding claims, characterised in that the lubricant applying means (8, 11) extends over the entire width of the printing cylinder (1) and can be switched on and off in sections, controlled by at least one valve (13) incorporated in the lubricant applying means (8, 11).
20. A method for printed on a web, wherein:

    a) the web (9) is printed on by means of a block cylinder (1) which exhibits a maximum printing width which can be covered with ink;

    b) and the ink is transported to the block cylinder (1) by means of at least one inking roller (4; 5; 6);

    c) wherein the inking roller (4; 5) is wetted with a lubricant in at least one axial section which is arranged within the maximum printing width, and lubricant instead of ink is transported in the wetted axial section;
    characterised in that

    d) the lubricant for wetting the axial section is supplied along the inking roller (4; 5) via a pipe-shaped supply line (8).
21. The method according to the preceding claim, characterised in that wetting the inking roller (4; 5) with lubricant is regulated by the operator or automatically.
22. The method according to any one of the preceding claims, characterised in that the lubricant is applied at least in the production run.
23. The method according to any one of the preceding claims, characterised in that by wetting with the lubricant, the friction on a section of the inking roller (4; 5; 6) which does not carry ink is reduced by means of the lubricant far enough that at least approximately identical resistance conditions prevail over the entire width of the inking roller (4; 5; 6).

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