EP4353481A1 - Device and method for ventilating a printing unit - Google Patents

Abstract

The invention relates to a device for ventilating a printing unit (1) of a printing machine for printing on a web-shaped or sheet-shaped substrate, comprising at least one side wall (2), at least one forme cylinder (3), at least one transfer and/or counter-pressure cylinder (4), at least one transfer roller (5) each with a roller body (6) for transferring printing ink and/or dampening solution, and a method for generating a targeted air circulation of air in a printing unit (1) comprising at least one side wall (2), at least one forme cylinder (3), at least one transfer and/or counter-pressure cylinder (4), at least one transfer roller (5) each with a roller body (6) for transferring printing ink and/or dampening solution.The invention is based on the object of creating a solution with which the circulation of air within a printing unit (1) can be influenced with little effort and without additional electrical consumers.The printing unit (1) according to the invention comprises at least one transfer roller (5) and/or at least one forme cylinder (3) and/or at least one transfer and/or impression cylinder (4), which has an air conveying device (7) on at least one side of the roller body (6) in the axial extension. The method according to the invention is characterized in that the air in the printing unit (1) is conveyed along the roller body (6) of the at least one transfer roller (5) and/or the at least one forme cylinder (3) and/or the at least one transfer and/or impression cylinder (4) by at least one air conveying device (7) attached to at least one transfer roller (5) rotating in the operating state and/or to at least one forme cylinder (3) and/or to at least one transfer and/or impression cylinder (4).

Description

The invention relates to a printing unit of a printing machine for printing a web-shaped or sheet-shaped substrate, comprising at least one side wall, at least one forme cylinder, at least one transfer and/or impression cylinder, at least one transfer roller, each with a roller body for transferring printing ink and/or dampening solution.

Furthermore, the invention relates to a transfer roller for transferring printing ink and/or dampening solution and/or a forme cylinder and/or a transfer and/or impression cylinder in a printing unit, wherein the transfer roller comprises a roller body.

The invention also relates to a method for generating a targeted air circulation of air in a printing unit comprising at least one side wall, at least one forme cylinder, at least one transfer and/or impression cylinder, at least one transfer roller, each with a roller body for transferring printing ink and/or dampening solution.

Printing units for printing web or sheet-shaped substrates use printing units in which there is at least one ink reservoir, for example in the form of an ink fountain, with the ink being transferred via at least one transfer roller to a forme cylinder on which the printing form is attached. In order to even out the ink to be applied, a number of transfer rollers are usually used, particularly in printing units for offset printing, flexographic printing and letterpress printing. These transfer rollers can be designed as ink transfer rollers, ink distributor rollers or ink application rollers. Transfer rollers are also used in a dampening unit to apply dampening solution in the offset printing process. which can be designed as dampening transfer rollers, dampening distributors or dampening application rollers.

Printing units such as offset printing units, letterpress printing units or flexographic printing units therefore have printing units with a plurality of transfer rollers and cylinders for printing ink and/or dampening solution and, due to their relatively high rotation speed, influence the flow of the air in the printing unit, including the moisture in this air or the finely distributed ink mist in this air. Particularly in areas in which small storage spaces are formed by the rollers, the air turbulence caused by the contact points of the adjacent transfer rollers leads to the relatively moist air, which is partially loaded with ink mist, being guided past the roller bodies of the transfer rollers in the direction of at least one side wall, since in the edge areas of the transfer rollers, in which there are no roller bodies but only the roller pins, the moist air, which may be loaded with ink mist, can escape. Such flow conditions can lead to ink and/or dampening solution deposits forming on the side walls over a longer period of time, which leads to increased cleaning effort.

Solutions are known from the prior art in which air is blown into the printing unit using a blower in order to influence the flow conditions of the air in the printing unit. Furthermore, solutions are known from the prior art in which air is sucked out of the printing unit in order to avoid such ink deposits.

However, both solutions have in common that, on the one hand, additional energy is required to generate the circulating air, and, on the other hand, lateral access to the printing unit is severely restricted due to the side walls and the control cabinets attached to the printing units or the drive and gear train.

The invention is therefore based on the object of creating a solution with which the circulation of air within a printing unit can be influenced with little effort and without additional electrical consumers.

This object is achieved by a printing unit according to claim 1, a printing roller according to claim 10 and a method according to claim 15.

The printing unit according to the invention comprises at least one transfer roller and/or at least one forme cylinder and/or at least one transfer and/or counter-pressure cylinder, which has an air conveying device on at least one side of the roller body in the axial extension.

The transfer roller according to the invention comprises at least one air conveying device at at least one end of the roller body, seen in axial extension.

The forme cylinder or transfer cylinder or impression cylinder according to the invention comprises at least one air conveying device at at least one end of the cylinder body and thus at at least one end of the roller body.

The method according to the invention is characterized in that the air in the printing unit is conveyed along the roller body of the at least one transfer roller and/or the at least one forme cylinder and/or the at least one transfer and/or counterpressure cylinder by at least one air conveying device attached to at least one transfer roller rotating in the operating state and/or to at least one forme cylinder and/or to at least one transfer and/or counterpressure cylinder.

Such designs have the advantage that the air circulation within a printing unit can be influenced with little effort, so that the air circulates in a way that prevents the deposit of ink residues. and that fluctuations in the humidity content of the air within a printing unit can be avoided.

According to one embodiment of the invention, at least one transfer roller and/or at least one forme cylinder and/or at least one transfer and/or counter-pressure cylinder comprises at least one air conveying device on both sides of the roller body, viewed in axial extension.

This design has the advantage that, in the case of printing units with large distances between the side walls, air turbulence can be generated on both sides of the at least one transfer roller or the at least one cylinder, which increases the air exchange due to the stronger circulation.

According to a further embodiment of the invention, at least one transfer roller and/or forme cylinder and/or transfer and/or impression cylinder comprising an air conveying device can be driven directly or indirectly by means of a drive. Such an embodiment has the advantage that the additional resistance and energy requirement of the air conveying device prevents slippage between the relevant transfer rollers and/or impression cylinders, and that the ink transfer and the register-accurate printing are therefore not negatively affected.

According to a further embodiment of the invention, the at least one air conveying device is designed such that air in the printing unit can flow from the side wall adjacent to the air conveying device along the roller body to the opposite side wall. Such a design has the advantage that, particularly in the case of transfer rollers which are surrounded by other transfer rollers, the trend of the printing ink and/or dampening solution migrating in the direction of the roller pins and thus in the direction of the side walls can be counteracted, since the air flow generated by the air conveying device counteracts this trend.

According to a further embodiment of the invention, at least one air conveying device is designed such that air located in the printing unit can flow from the roller body in the direction of the side wall adjacent to the air conveying device. Such a design has the advantage that the effect of the air escaping in narrow storage spaces formed by a plurality of transfer rollers within a printing unit can be promoted, provided this is desired and necessary.

Fig. 1

Ein beispielhaftes Druckwerk wie aus dem Stand der Technik bekannt

Fig. 2

Eine beispielhafte Anordnung von Übertragwalzen wie aus dem Stand der Technik bekannt

Fig. 3

Eine beispielhafte Anordnung von erfindungsgemäßen Übertragwalzen

Fig. 4

Eine erfindungsgemäße Übertragwalze mit einer Luftfördereinrichtung zur Erzeugung eines Luftstromes

Fig. 5

Eine erfindungsgemäße Übertragwalze mit zwei Luftfördereinrichtungen zur Erzeugung eines entgegengesetzten Luftstromes

Fig. 6

Eine erfindungsgemäße Übertragwalze mit zwei Luftfördereinrichtungen zur Erzeugung eines gleichgerichteten Luftstromes

Fig. 7

Eine erfindungsgemäße Übertragwalze mit zwei Luftfördereinrichtungen zur Erzeugung eines entgegengesetzten, nach außen gerichteten Luftstromes

Preferred developments of the invention emerge from the subclaims and the following description. Various embodiments of the invention are explained in more detail with reference to the drawings, without being limited thereto. In the drawings:

Fig.1

An exemplary printing unit as known from the state of the art

Fig.2

An exemplary arrangement of transfer rollers as known from the prior art

Fig.3

An exemplary arrangement of transfer rollers according to the invention

Fig.4

A transfer roller according to the invention with an air conveyor for generating an air flow

Fig.5

A transfer roller according to the invention with two air conveying devices for generating an opposing air flow

Fig.6

A transfer roller according to the invention with two air conveying devices for generating a rectified air flow

Fig.7

A transfer roller according to the invention with two air conveying devices for generating an opposing, outward-directed air flow

Fig.1 shows an exemplary printing unit 1 comprising an ink reservoir 13 designed as an ink fountain, from which printing ink can be conveyed by means of an ink duct 12. The printing ink conveyed from the ink reservoir 13 is split by a plurality of transfer rollers 5, so that the ink film is reduced in thickness and made more uniform. The printing ink thus made more uniform is transferred via the plurality of transfer rollers 5, for example, to a forme cylinder 3, wherein the forme cylinder 3 carries a printing form with the print image to be transferred on its outer surface. In the Fig.1 In the printing unit 1 shown as an example, the print image is transferred to a transfer cylinder 4, which then transfers the print image to the substrate to be printed (not shown). In a printing unit 1 that is designed for double-sided printing, the transfer cylinder 4 can also serve as a counter-pressure cylinder for the printing cylinders on the underside of the substrate, which is why the transfer cylinder 4 is referred to below as the transfer and/or counter-pressure cylinder 4.

This in Fig.1 The printing unit 1 shown as an example is shown without a dampening unit. For the sake of completeness, it is mentioned here that such a printing unit 1 can also have a dampening unit comprising at least one transfer roller 5, with which dampening solution can be conveyed to the forme cylinder 3 and applied to it.

This in Fig.1 The printing unit 1 shown is a purely exemplary representation of a printing unit. The present invention is independent of the number and/or configuration of the transfer rollers 5, the design of the forme cylinder 3 or the transfer and impression cylinder 4. Thus, a printing unit 1 equipped with the invention can have a significantly smaller number of transfer rollers 5, the forme cylinder 3 can be designed as a plate cylinder for offset or flexo printing plates or as an engraved gravure cylinder, etc.; the transfer and/or impression cylinder 4 can also be designed exclusively as an impression cylinder.

This in Fig.1 The printing unit 1 shown as an example also comprises an ink catcher roller 10, which has a relatively small gap s to the adjacent transfer rollers 5. This ink catcher roller 10 serves to catch any ink splashes that may occur that are thrown off by the adjacent transfer rollers 5 and to remove this printing ink from its outer surface using a doctor blade (not shown). Such ink splashes can occur, for example, at high rotation speeds of the transfer rollers 5, at high ink layer thicknesses on the transfer rollers 5, at over-emulsification of the printing ink or very one-sided ink removal through the printing form or due to inadequately coordinated consumables.

In the relatively limited space formed between the first and second transfer roller 5 and the ink catcher roller 10 downstream of the ink duct roller 12, air located in the printing unit 1 is conveyed by the rotation of the transfer rollers 5, which escapes in the axial direction towards the transfer rollers 5 and thus in the direction of the side walls 2. This air flow 11 can convey the ink mist contained in the space, so that in the area of the in Fig.1 An accumulation of ink residues and thus of printing ink can occur on the side walls 2 (not shown), which can have disadvantages.

Fig. 2 shows a section of the Fig.1 illustrated printing unit 1 in the viewing direction X, as known from the prior art.

Fig. 2 shows the transfer rollers 5 mounted in the first side wall 2-1 and in the second side wall 2-2, wherein the transfer rollers 5 each comprise a roller body 6, wherein the transfer rollers 5 roll on each other on the outer surface of the roller body 6.

Although Fig.2 by way of example only shows the transfer rollers 5 rolling on each other, this figure is also valid for the printing cylinders in the form of the forme cylinder 3 and the transfer and/or counter-pressure cylinder 4, since such Forme cylinder 3 and transfer and/or counter-pressure cylinder 4 comprise cylinder pins that can be mounted in the two side walls 2-1 and 2-2 as well as cylinder bodies that roll on one another. Since the design of the cylinder bodies is not relevant for the present invention, the term roller body 6 is also used for the forme cylinder 3 and the transfer and/or counter-pressure cylinder 4.

Fig.3 also shows the view X from Fig.1 with a first ink transfer roller 5-1, a second ink transfer roller 5-2 and a third ink transfer roller 5-3, wherein all three ink transfer rollers 5 are mounted in both the first side wall 2-1 and the second side wall 2-2. Each of the transfer rollers 5 comprises a roller body 6. Thus, the first transfer roller 5-1 comprises a first roller body 6-1, which rolls on the second roller body 6-2 of the second transfer roller 5-2. The second roller body 6-2 rolls on the third roller body 6-3 of the third transfer roller 5-3.

An air conveying device 7 is attached to the roller body 6-2 of the second transfer roller 5-2 at both axial ends and thus on both sides of the roller body 6-2. Due to the rotation of the transfer rollers 5 during operation, the second transfer roller 5-2 also rotates at a peripheral speed equal to the speed of the substrate to be printed, so that the two air conveying devices 7 are also set in rotation and can generate an air flow 11 through appropriate design.

Although in Fig.3 For example, only the second transfer roller 5-2 comprises two air conveying devices 7, it is also possible for several or all transfer rollers 5 to comprise at least one air conveying device 7.

Although in Fig.3 only one transfer roller 5 comprises air conveyors 7, it is also possible, although in Fig.3 not shown that at least one forme cylinder 3 and/or at least one transfer and/or impression cylinder 4 and/or at least one transfer roller 5 each comprise at least one air conveying device 7.

The transfer rollers 5 can be designed as an ink roller and/or as an ink distributor and/or as an ink application roller and/or as a dampening roller and/or as a dampening distributor and/or as a dampening application roller.

The air conveying device 7 can be designed as a turbine wheel and/or as a paddle wheel and/or as a fan wheel and/or as a propeller, which is positively, non-positively or materially connected to the transfer roller 5 or the forme cylinder 3 or the transfer and/or counter-pressure cylinder 4. The air conveying device 7 can also be a part of the corresponding transfer roller 5 or the corresponding cylinder (forme cylinder 3 or transfer and/or counter-pressure cylinder 4). The only important thing here is that when the transfer roller 5 or the forme cylinder 3 or the transfer and/or counter-pressure cylinder 4 rotates, the air conveying device 7 is also set in rotation and in the process generates an air flow 11 essentially in the axial or additionally in the radial and/or tangential extension of the transfer roller 5 or the forme cylinder 3 or the transfer and/or counter-pressure cylinder 4.

Fig.4 shows a section of the printing unit 1 in view X with only one transfer roller 5 with only one air conveying device 7 attached to the transfer roller 5 or to the roller body 6 in order to better illustrate a possible application of the air conveying device 7. Although in Fig.4 only one transfer roller 5 with only one air conveying device 7 is shown, this design and use can be transferred to any number of transfer rollers 5 and/or to any number of forme cylinders 3 and/or any number of transfer and/or impression cylinders 4.

Fig.4 shows an exemplary transfer roller 5, which is mounted in a first side wall 2-1 and in a second side wall 2-2. The present invention can also be used with a transfer roller 5 that is only cantilevered in one side wall 2 or a forme cylinder 3 that is only cantilevered in one side wall 2 and/or a transfer and/or impression cylinder 4 that is cantilevered. The transfer roller 5 also comprises a drive 8, which can be designed as a gear, for example. The at least one transfer roller 5 can thus be driven directly or indirectly via this drive 8.

If the printing unit 1 prints a substrate, the transfer roller 5 rotates about its longitudinal axis, so that the air conveyor 7 connected to the transfer roller 5 also rotates about the longitudinal axis. Fig.4 In the embodiment shown, the air conveying device 7 is designed such that the air in the printing unit 1 is blown from the side wall 2-1 adjacent to the air conveying device 7 along the roller body 6 to the opposite side wall 2-2. The air accelerated by the air conveying device 7 is consequently sucked in from the area between the air conveying device 7 and the side wall 2-1 adjacent to the air conveying device 7 and pressed in the direction of the opposite side wall 2-2.

Although not in Fig.4 shown, it is however also possible that the air conveying device 7 attached to the transfer roller 5 and/or the forme cylinder 3 and/or the transfer and/or impression cylinder 4 is designed in such a way that the air in the printing unit 1 is blown from the roller body 6 in the direction of the side wall 2-1 adjacent to the air conveying device 7. In this case, the air is sucked in from the area of the opposite side wall 2-2 and from the area around the roller body 6 and pressed in the direction of the side wall 2-1 adjacent to the air conveying device 7.

Fig.5 shows a transfer roller 5 mounted in a first side wall 2-1 and in a second side wall 2-2. As already explained above, instead of the transfer roller 5 shown as an example, it can also be a forme cylinder 3 or a transfer and/or counter-pressure cylinder 4, since the structure and the operating principle are almost identical.

In the Fig.5 The transfer roller 5 shown comprises a first air conveying device 7-1 at a first end of the roller body 6 and a second air conveying device 7-2 at the second end of the roller body 6. The first air conveying device 7-1 is designed such that it transports the air located in the printing unit 1 from the adjacent first side wall 2-1 along the roller body 6 in the direction of the second air conveying device 7-2. The first air conveying device 7-1 thus sucks in the air essentially from the area between the first air conveying device 7-1 and the first side wall 2-1. The second air conveying device 7-2 is designed such that it conveys the air located in the printing unit 1 from the adjacent second side wall 2-2 along the roller body 6 in the direction of the first air conveying device 7-1. The second air conveying device 7-2 thus sucks in the air essentially from the area between the second air conveying device 7-2 and the second side wall 2-2.

This configuration thus counteracts the escape of air laden with ink mist from narrower areas between transfer rollers 5, so that the ink mist is essentially drawn away from a Fig.1 shown ink catcher roller 10.

Fig.6 shows a transfer roller 5 mounted in a first side wall 2-1 and in a second side wall 2-2. As already explained above, instead of the transfer roller 5 shown as an example, it can also be a forme cylinder 3 or a transfer and/or counter-pressure cylinder 4, since the structure and the operating principle are almost identical.

In the Fig.6 The transfer roller 5 shown comprises a first air conveying device 7-1 at a first end of the roller body 6 and comprises a second air conveying device 7-2 at the second end of the roller body 6. The first air conveying device 7-1 is designed such that it transports the air in the printing unit 1 from the adjacent first side wall 2-1 along the roller body 6 in the direction of the second air conveying device 7-2. The first air conveying device 7-1 thus sucks in the air essentially from the area between the first air conveying device 7-1 and the first side wall 2-1.

The second air conveying device 7-2 is designed in such a way that it conveys the air in the printing unit 1 from the roller body 6 in the direction of the second side wall 2-2, which is adjacent to the second air conveying device 7-2. The second air conveying device 7-2 thus sucks in the air essentially from the area around the roller body 6.

With this configuration, the first air conveying device 7-1 and the second air conveying device 7-2 generate a synchronous air flow 11, with which the air loaded with ink mist can be conveyed specifically to one side of the printing unit 1, for example in order to then convey it out of the printing unit 1 with an additional ventilation system or extraction system.

Fig.7 shows a transfer roller 5 mounted in a first side wall 2-1 and in a second side wall 2-2. As already explained above, instead of the transfer roller 5 shown as an example, it can also be a forme cylinder 3 or a transfer and/or counter-pressure cylinder 4, since the structure and the operating principle are almost identical.

In the Fig.7 The transfer roller 5 shown comprises a first air conveying device 7-1 at a first end of the roller body 6 and a second air conveying device 7-2 at the second end of the roller body 6. The first air conveying device 7-1 is designed such that it transports the air located in the printing unit 1 from the roller body 6 in the direction of the adjacent first side wall 2-1. The first air conveying device 7-1 thus sucks in the air essentially from the area around the roller body 6. The second air conveying device 7-2 is designed such that it conveys the air located in the printing unit 1 from the roller body 6 in the direction of the second side wall 2-2, which is adjacent to the second air conveying device 7-2. The second air conveying device 7-2 thus sucks in the air essentially from the area around the roller body 6.

With this configuration, the first air conveying device 7-1 and the second air conveying device 7-2 generate an opposing air flow 11 directed in the direction of the two side walls 2-1 and 2-2, with which the air laden with ink mist can be conveyed in a targeted manner to both sides of the printing unit 1, for example in order to then convey it out of the printing unit 1 with additional ventilation systems or extraction systems.

In all embodiments, the air conveying device 7 is designed such that it conveys the air in the printing unit 1 on the outside of the transfer roller 5 and/or the forme cylinder 3 and/or the transfer and/or counter-pressure cylinder 4 and thus on the outside of the respective roller body 6, to allow circulation of the air outside the roller body 6.

With the inventive design of at least one transfer roller 5 and/or a forme cylinder 3 and/or a transfer and/or impression cylinder 4, a Fig.1 The printing unit 1 shown can be operated with a method, wherein at least one air conveying device 7 attached to at least one transfer roller 5 and/or forme cylinder 3 and/or transfer and/or impression cylinder 4 rotating in the operating state conveys the air in the printing unit 1 along the respective roller body 6 of the at least one transfer roller 5 and/or the at least one forme cylinder 3 and/or the at least one transfer and/or impression cylinder 4.

List of reference symbols

1

Printing unit

2

Side wall

3

Form cylinder

4

Transfer and/or impression cylinder

5

Transfer roller

6

Roller body

7

Air conveyor

8th

drive

9

Transfer roller

10

Ink catcher roller

11

Airflow

12

Ink Ductile Iron

13

Color reservoir

s

gap

Claims (15)

Printing unit (1) of a printing machine for printing on a web-shaped or sheet-shaped substrate, comprising at least one side wall (2), at least one forme cylinder (3), at least one transfer and/or counter-pressure cylinder (4), at least one transfer roller (5) each with a roller body (6) for transferring printing ink and/or dampening solution, characterized in that at least one transfer roller (5) and/or at least one forme cylinder (3) and/or at least one transfer and/or counter-pressure cylinder (4) has an air conveying device (7) on at least one side of the roller body (6) viewed in axial extension. Printing unit (1) according to claim 1, characterized in that at least one transfer roller (5) and/or at least one forme cylinder (3) and/or at least one transfer and/or counter-pressure cylinder (4) has at least one air conveying device (7) on both sides of the roller body (6) as seen in axial extension. Printing unit (1) according to one of claims 1 or 2, characterized in that at least one transfer roller (5) and/or forme cylinder (3) and/or transfer and/or impression cylinder (4) comprising an air conveying device (7) can be driven directly or indirectly by means of a drive (8). Printing unit (1) according to one of claims 1 to 3, characterized in that at least one air conveying device (7) is designed such that air located in the printing unit (1) can flow from the side wall (2-1) adjacent to the air conveying device (7) along the roller body (6) to the opposite side wall (2-2). Printing unit (1) according to one of claims 1 to 3, characterized in that at least one air conveying device (7) is designed such that an air located in the printing unit (1) can flow from the roller body (6) in the direction of the side wall (2) adjacent to the air conveying device (7). Printing unit (1) according to one of claims 1 to 5, characterized in that at least one transfer roller (5) and/or at least one forme cylinder (3) and/or at least one transfer and/or counter-pressure cylinder (4) comprises a first air conveying device (7-1) at a first end of the roller body (6) and a second air conveying device (7-2) at a second end of the roller body (6), and wherein the first air conveying device (7-1) is designed such that it transports the air in the printing unit (1) from the adjacent first side wall (2-1) along the roller body (6) in the direction of the second air conveying device (7-2), and wherein the second air conveying device (7-2) is designed such that it transports the air in the printing unit (1) from the roller body (6) in the direction of the second side wall (2-2). Printing unit (1) according to one of claims 1 to 5, characterized in that at least one transfer roller (5) and/or at least one forme cylinder (3) and/or at least one transfer and/or counter-pressure cylinder (4) comprises a first air conveying device (7-1) at a first end of the roller body (6) and a second air conveying device (7-2) at a second end of the roller body (6), and wherein the first air conveying device (7-1) is designed such that it transports the air located in the printing unit (1) from the adjacent first side wall (2-1) along the roller body (6) in the direction of the second air conveying device (7-2), and wherein the second air conveying device (7-2) is designed such that it transports the air located in the printing unit (1) from the adjacent second side wall (2-2) along the roller body (6) in the direction of the first air conveying device (7-1). Printing unit (1) according to one of claims 1 to 7, characterized in that the at least one transfer roller (5) is designed as an inking roller and/or as an inking distributor and/or as an inking application roller and/or as a dampening roller and/or as a dampening distributor and/or as a dampening application roller. Printing unit (1) according to one of claims 1 to 8, characterized in that the air conveying device (7) is designed as a turbine wheel and/or as a paddle wheel and/or as a fan wheel and/or as a propeller. Transfer roller (5) for transferring printing ink and/or dampening solution in a printing unit (1), wherein the transfer roller (5) comprises a roller body (6), characterized in that at least one air conveying device (7) is attached to at least one end of the roller body (6) viewed in axial extension. Transfer roller (5) according to claim 10, characterized in that the at least one air conveying device (7) is designed such that this air can be conveyed away from the air conveying device (7) in the direction of the roller body (6) and/or that at least one air conveying device (7) is designed such that this conveys air from the roller body (6) in the direction of the air conveying device (7). Transfer roller (5) according to one of claims 10 to 11, characterized in that the transfer roller (5) comprises a first air conveying device (7-1) at a first end of the roller body (6) and a second air conveying device (7-2) at a second end of the roller body (6), and wherein the first air conveying device (7-1) is designed such that it transports the air located in the printing unit (1) along the roller body (6) in the direction from the first air conveying device (7-1) to the second air conveying device (7-2), and wherein the second air conveying device (7-2) is designed such that it transports the air located in the printing unit (1) along the roller body (6) in the direction from the first air conveying device (7-1) to the second Air conveyor (7-2) transported. Transfer roller (5) according to one of claims 10 to 11, characterized in that the transfer roller (5) comprises a first air conveying device (7-1) at a first end of the roller body (6) and a second air conveying device (7-2) at a second end of the roller body (6), and wherein the first air conveying device (7-1) is designed such that it transports the air located in the printing unit (1) along the roller body (6) in the direction from the first air conveying device (7-1) to the second air conveying device (7-2), and wherein the second air conveying device (7-2) is designed such that it transports the air located in the printing unit (1) along the roller body (6) in the direction from the second air conveying device (7-2) to the first air conveying device (7-1). Forme cylinder (3) or transfer cylinder (4) or impression cylinder (4), each comprising a roller body (6), characterized in that at least one air conveying device (7) is attached to at least one end of the cylinder body in the axial extension. Method for generating a targeted air circulation of air in a printing unit (1) comprising at least one side wall (2), at least one forme cylinder (3), at least one transfer and/or impression cylinder (4), at least one transfer roller (5), each with a roller body (6) for transferring printing ink and/or dampening solution, characterized in that the air in the printing unit (1) is conveyed along the roller body (6) of the at least one transfer roller (5) and/or of the at least one forme cylinder (3) and/or of the at least one transfer and/or impression cylinder (4) by at least one air conveying device (7) attached to at least one transfer roller (5) rotating in the operating state and/or to at least one forme cylinder (3) and/or to at least one transfer and/or impression cylinder (4).

Images