DE102023127728A1 - Device for changing dosing rollers in a printing machine - Google Patents

Abstract

A device for changing metering rollers (1) in a printing press comprises a revolver magazine (2) for the metering rollers (1), a roller lock (3), a lifting device (4) with an actuator (5) for transporting the metering rollers (1) from the revolver magazine (2) to the roller lock (3) and back again, and a protective cover (6) which can be adjusted optionally into a closed position in which the protective cover (6) blocks a transport path (7) of the metering rollers (1) located between the revolver magazine (2) and the roller lock (3), and into an open position in which the protective cover (6) clears the transport path (7). The actuator (5) of the lifting device (4) is controlled by a control device (8) depending on whether the protective cover (6) is in the open position or the closed position. The lifting device (4) has a roller holder (10) for the metering rollers (1). A parking position is determined for the roller holder (10), in which the roller holder (10) is located during a printing operation. The roller lock (3) is located along the transport path (11) between the revolver magazine (2) and the parking position.

Description

The present invention relates to a device for changing metering rollers in a printing press, comprising a turret magazine for the metering rollers, a roller lock, a lifting device with an actuator for transporting the metering rollers from the turret magazine into the roller lock and back again, and a protective cover which can be adjusted selectively into a closed position in which the protective cover blocks a transport path of the metering rollers located between the turret magazine and the roller lock, and into an open position in which the protective cover clears the transport path.

Such a device is in DE 103 15 191 B4 described.
Further state of the art is EP 1 767 362 A2 .

The object of the invention is to provide a further device for changing dosing rollers.

The object is achieved by a device for changing metering rollers in a printing machine, comprising a revolver magazine for the metering rollers, a roller lock, a lifting device with an actuator for transporting the metering rollers from the revolver magazine into the roller lock and back again, and a protective cover which can be adjusted optionally into a closed position in which the protective cover blocks a transport path of the metering rollers located between the revolver magazine and the roller lock, and into an open position in which the protective cover clears the transport path, characterized in that the actuator of the lifting device is controlled by a control device depending on whether the protective cover is in the open position or the closed position, that the lifting device has a roller holder for the metering rollers, that a parking position is determined for the roller holder, in which the roller holder is located during a printing operation, and that the roller lock is located along the transport path between the revolver magazine and the parking position.

The device allows fully automatic operation, is user-friendly and reduces set-up time.

In a further development, an actuator is available for adjusting the protective cover to the closed position and to the open position.

The control device can be programmed in such a way that the actuator of the protective cover and the actuator of the lifting device are controlled in a coordinated manner by the control device.

The control device can be programmed in such a way that the actuator of the protective cover automatically opens the protective cover before each roll change operation and automatically closes it after each roll change operation.

The control device can be programmed in such a way that the actuator of the protective cover automatically moves the protective cover out of the transport path of the dosing roller when the respective dosing roller is transported along the transport path by the lifting device.

The roller holder can be adjustable along the transport path,
wherein the roller holder with the metering roller accommodated therein and required for the subsequent printing operation can be adjusted in a direction from the revolver magazine to the roller lock and wherein the roller holder can be adjusted further in said direction into the parking position in the empty state after the metering roller has been inserted into the roller lock.

The revolver magazine can have a locking mechanism for simultaneously locking and unlocking several metering rollers in the revolver magazine.

The printing press can have at least one main motor, a drive shaft can extend into the roller lock, a coupling for coupling the metering roller inserted into the roller lock to the drive shaft can be present and the drive shaft can be driven by a separate motor which is different from each main motor of the printing press.

The coupling can have a first coupling half on the drive shaft and a second coupling half on the dosing roller, a sensor for detecting a specific rotational position into which the first coupling half can be rotated by the separate motor can be present and in the specific rotational position an engagement direction of the coupling can run parallel to the transport path, wherein the lifting device enables the second coupling half to be moved in the engagement direction when coupling and against the engagement direction when uncoupling.

The device according to the invention can be operated - program-controlled by the control device - according to the following operating method: In a first step, the second coupling half of a first dosing roller located in the roller lock is aligned in the engagement direction by the separate motor.
In a second step, the revolver magazine is rotated to a first rotational position in which an empty, first compartment of the revolver magazine points towards the roller lock or downwards, and the protective cover is adjusted to the open position by the actuator of the protective cover.

In a third step, the locking mechanism for the dosing rollers in the revolver magazine is opened and the roller lock is opened.

In a fourth step, the first dosing roller is removed from the roller lock by the roller holder of the lifting device and transported upwards into the first compartment of the revolver magazine.

In a fifth step, the locking mechanism for the dosing rollers in the revolver magazine is closed.

In a sixth step, the actuator of the lifting device moves the empty roller holder along the transport path downwards until the roller holder is outside a collision area of the revolver magazine.

In a seventh step, the revolver magazine is rotated to a second rotational position in which a second compartment of the revolver magazine, which is occupied by a second dosing roller, points downwards.

In an eighth step, the roller holder is moved along the transport path towards the revolver magazine or upwards until the roller holder is in a transfer position in which the revolver magazine can transfer the second dosing roller to the roller holder.

In a ninth step, the lock for the dosing rollers in the revolver magazine is opened and the roller holder takes up the second dosing roller.

In a tenth step, the second dosing roller is transported through the roller holder in one direction along the transport path to the roller lock and deposited therein, and the subsequently empty roller holder is moved further in the same direction to a parking position and positioned there.

In an eleventh step, the locking mechanism for the dosing rollers in the revolver magazine is closed and the roller lock is closed or locked.

In a twelfth step, the protective cover is moved into the closed position by the protective cover actuator. The device is then ready for printing operation.

In an optional, thirteenth step, the revolver magazine is rotated to a third rotation position in which a compartment of the revolver magazine occupied by the first or third metering roller faces upwards and is accessible to the operating personnel. The first or third metering roller can thus be replaced or cleaned during ongoing printing operations.

• 1-14 verschiedene Betriebsphasen einer Walzenwechselvorrichtung und
• 15 und 16 verschiedene Konstruktionsdetails der Walzenwechselvorrichtung.

An embodiment is described below using a drawing in which:

• 1-14 different operating phases of a roll changing device and
• 15 and 16 various design details of the roll changing device.

The roller changing device is located in a sheet-fed printing machine in which several offset printing units and a coating unit are arranged in a row. The coating unit has a revolver magazine 2 which can be rotated about a geometric axis 33 by an actuator. Metering rollers 1 with different grids are stored in compartments 32 of the revolver magazine 2. There can be four or preferably three compartments 32, as shown. During printing, one or the other metering roller 1 from the revolver magazine 2 is used in a roller lock 3.

The revolver magazine 2 and the roller lock 3 are located above a cylinder that coats the sheet with varnish (or an alternative fluid). The selected metering roller 1, which sits in the roller lock 3 during printing, is in rolling contact with the cylinder in question according to one variant or with a roller that is in rolling contact with the cylinder according to another variant. The cylinder can be a blanket or forme cylinder. The cylinder forms a printing gap together with a counter-pressure cylinder of the coating unit.

A lifting device 4 is arranged for transporting the metering roller 1 along a transport path 7 from the revolver magazine 2 into the roller lock 3. The lifting device 4 includes a roller holder 10, which during transport. The roller holder 10 holds the metering roller 1 at its axle journal 37, within an area between a roller barrel 38 and a roller bearing 34, which sits on the axle journal 37. The roller holder 10 is hook-shaped so that it can securely hold the metering roller 1. The transport path 7 is determined by a linear guide 29, specifically a rail, along which the roller holder 10 can be moved by an actuator 5, specifically an electric motor.

16 shows a chain drive 35, via which the actuator 5 is connected to the roller holder 10. A chain 31 is attached to the roller holder 10 at its ends, with one end being deflected by a stationary pinion 36 so that the pulling directions of the two chain ends are opposite. The actuator 5 drives the chain 31 via a gear 30. The chain 31 is in the 1-14 , so that they do not become confusing, are not shown.

In the 2-14 the device is shown from one side of the machine and in 1 from the opposite side of the machine. On each side of the machine there is a roller holder 10 and a guide 29, whereby the two roller holders 10 are coupled to each other via a gear so that they can be driven together by the actuator 5. Due to the 2-14 The underlying cutting path shows the guide 29 arranged on one side of the machine and the roller holder 10 arranged on the other side of the machine.

1 shows that there are catches 24 which rest against the driving claws 39 of the dosing rollers 1 in the revolving magazine 2. The catches 24 are designed as levers and have wedge surfaces 25 and are loaded by springs 26, by means of which the catches 24 are pressed against the driving claws 39.

A protective cover 6 can be optionally moved into an open position by an actuator 9 - see. 2 - and a closed position - cf. 1 - pivotable. There is a sensor for detecting the protective cover 6 in the open position and another sensor for detecting the protective cover 6 in the closed position, whereby the two sensors (not shown in the drawing) are connected to an electronic control device 8. One sensor monitors whether the protective cover 6 is in its correct opening end position and the other sensor monitors whether the protective cover 6 is in its correct closing end position. The actuator 9 is a pneumatic working cylinder.

The protective cover 6 is bowl-shaped, e.g. a sheet metal bowl. It closes the turret magazine 2 at the bottom during printing. This protects the two clean metering rollers 1 in the turret magazine 2 from contamination by paint splashes that the rotating metering roller 1 in the roller lock 3 throws away. In addition, the closed protective cover 6 enables maintenance or cleaning work to be carried out on the turret magazine 2 or the metering rollers 1 in it while printing is in progress. Tools accidentally dropped during this work are caught by the protective cover 6 and cannot fall onto the rotating metering roller 1 in the roller lock 3 located underneath, which would otherwise cause damage to the machine.

A first support 21 and a second support 22 secure the metering rollers 1 in the revolving magazine 2. The supports 21, 22 each have a concave support surface 23 against which the roller bearing 34 of the respective metering roller 1 rests. The first support 21 is immobile and the second support 22 is connected to the protective cover 6 and can be pivoted together with it by the actuator 9.

2 shows a locking mechanism 13 with a disk 27 (which can also be called a locking ring) which can be selectively moved into a locking position by an actuator - cf. 2 - and an unlocking position - cf. 1 - can be rotated about the axis 33. The disk 27 is star-shaped and has hooks 28 (so-called locking hooks), one hook 28 per compartment 32. In the locking position, the hooks 28 engage behind the axle pins 37 of the metering rollers 1 in the compartments 32 of the revolver magazine 2 and in the unlocking position they do not. By rotating the disk 27 relative to the compartments 32, all the metering rollers 1 in the revolver magazine 2 are locked or unlocked simultaneously - depending on the direction of rotation.

15 shows from one to the 1-14 orthogonal view in a sectional view of one of the metering rollers 1, which sits with its roller bearing 34 in the roller lock 3. A drive shaft 14 projects into the roller lock 3, via which a separate motor 16 drives the metering roller 1. The separate motor 16 is different from a main motor that drives the cylinders of the coating unit.

A coupling 15 consists of a first coupling half 17, which is arranged on the drive shaft 14, and a second coupling half 18, which is arranged on the axle journal 37 of the metering roller 1. The coupling 15 is a claw coupling and the second coupling half 18 is formed by the already mentioned driver claw 39. On each of the three metering rollers 1, such a second coupling half 18 is arranged, which is compatible with the first coupling half 17. The first coupling half 17 is a radial groove that is made in the flat surface of the drive shaft 14, similar to the slot in a screw head. When coupling, the metering roller 1 is moved by the lifting device 4 towards the roller lock 3, whereby the second coupling half 18 comes into engagement with the first coupling half 17. This movement takes place in an engagement direction 20 and the driver claw 39 is pushed into said groove. The engagement direction 20 is orthogonal to the axis of rotation of the drive shaft 14 and the coupling 15. When the coupling 15 is closed, the torque is transferred from the drive shaft to the metering roller 1 via this. A contactless sensor 19 monitors the rotational position of the drive shaft 14 and thus of the first clutch half 17. The sensor 19 signals the control device 8 when the first clutch half 17 is in a rotational angle position required for coupling or uncoupling, in which the groove runs parallel to the engagement direction 20. The sensor 19 is directed at an index disk 40 which is coaxially connected to the drive shaft 14. Using two diametrical markings on the index disk 40, the sensor 19 recognizes the two possible rotational angle positions at which the coupling processes are possible. The control device 8 controls the separate motor 16 and stops it when the required rotational angle position is reached.

• 1 zeigt einen ersten Schritt, in dem die Mitnehmerklaue 39 der im Walzenschloss 3 befindlichen Dosierwalze 1 in Eingriffsrichtung 20 ausgerichtet wird. Dabei dreht der Separatmotor 16 beide Kupplungshälften 17, 18 der zu diesem Zeitpunkt noch geschlossenen Kupplung 15 in die erforderliche Drehstellung.
• 2 zeigt einen zweiten Schritt, in dem das Revolvermagazin 2 durch den Stellantrieb des Revolvermagazins 2 in eine erste Drehstellung gedreht wird, in der ein leeres Fach 32 des Revolvermagazins 2 in etwa zum Walzenschloss 3 zeigt, und wird die Schutzabdeckung 6 durch den Stellantrieb 9 der Schutzabdeckung 6 aus dem Transportpfad 7 heraus verstellt.
• 3 zeigt einen dritten Schritt, in dem die Verriegelung 13 für die Dosierwalzen 1 im Revolvermagazin 2 gelöst wird und das Walzenschloss 3 entriegelt wird. Es ist hierbei egal, ob das Lösen der Verriegelung 13 oder das Entriegeln des Walzenschlosses 3 zuerst erfolgt oder ob beides gleichzeitig erfolgt.
• 4 zeigt einen vierten Schritt, in dem die im Walzenschloss 3 befindliche Dosierwalze 1, die beim vorhergehenden Druckjob verwendet worden ist, durch die Walzenaufnahme 10 der Hubeinrichtung 4 aus dem Walzenschloss 3 gehoben und entlang dem Transportpfad 7 in das leere Fach 32 des Revolvermagazins 2 hinein gefördert wird.
• 5 zeigt einen fünften Schritt, in dem die Dosierwalzen 1 im Revolvermagazin 2 durch ein Zurückdrehen der Scheibe 27 verriegelt werden. Die Scheibe 27 wird bezüglich der Zeichnung im Uhrzeigersinn gedreht, bis die Haken der Scheibe 27 die Achszapfen 37 der Dosierwalzen 1 hintergreifen.
• 6 zeigt einen sechsten Schritt, in dem durch den Stellantrieb 5 der Hubeinrichtung 4 die Walzenaufnahme 10 ohne eine Dosierwalze 1 entlang der Führung 29 von dem Revolvermagazin 2 weg in eine Abstandstellung verfahren wird, in der sich die Walzenaufnahme 10 außerhalb eines Drehbereiches des Revolvermagazins 2 befindet und mit diesem bei Drehungen des Revolvermagazins 2 nicht kollidieren kann.
• 7 zeigt einen siebten Schritt, in welchem das Revolvermagazin 2 in eine zweite Drehstellung gedreht wird, in der ein Fach 32, in dem eine für den nachfolgenden Druckauftrag erforderliche Dosierwalze 1 gespeichert ist, in etwa zum Walzenschloss 3 zeigt.
• 8 zeigt einen achten Schritt, in dem die Walzenaufnahme 10 entlang der Führung 29 zu dem Revolvermagazin 2 hin so weit verfahren, bis sich die Walzenaufnahme 10 in einer Übergabestellung befindet, in der das Revolvermagazin 2 die Dosierwalze 1 aus dem nach unten weisenden Fach 32 an die Walzenaufnahme 10 übergeben kann.
• 9 zeigt einen neunten Schritt, in dem die Verriegelung 13 für die Dosierwalzen 1 im Revolvermagazin 2 geöffnet wird, wozu die Scheibe 27 entgegen dem Uhrzeigersinn gedreht wird, sodass die Haken der Scheibe 27 außer Kontakt mit den Achszapfen 37 der Dosierwalzen 1 gelangen. Dadurch fällt die Dosierwalze 1 aus dem nach unten weisenden Fach 32 in die darunter positionierte und nach oben offene Walzenaufnahme 10, durch welche die Dosierwalze 1 aufgenommen wird.
• 10 zeigt einen zehnten Schritt, in dem die von der Walzenaufnahme 10 aufgenommene Dosierwalze 1 durch die Hubeinrichtung 4 in eine Richtung 12 entlang dem Transportpfad 7 zum Walzenschloss 3 transportiert und darin abgelegt wird und danach die leere Walzenaufnahme 10 weiter in die gleiche Richtung 12 bis in eine Parkposition 11 verfahren und dort positioniert wird.
• 11 zeigt einen elften Schritt, in dem die Verriegelung 13 für die Dosierwalzen 1 im Revolvermagazin 2 durch Drehen der Scheibe 27 im Uhrzeigersinn wieder geschlossen wird und das Walzenschloss 3 ebenfalls wieder verriegelt wird.
• 12 zeigt einen zwölften Schritt, in dem die Schutzabdeckung 6 durch den Stellantrieb 9 der Schutzabdeckung 6 in die geschlossene Stellung verstellt wird. Danach ist die Vorrichtung für einen Druckbetrieb bereit.
• 13 zeigt einen optionalen, dreizehnten Schritt, in dem das Revolvermagazin 2 in eine dritte Drehstellung gedreht, in der ein mit einer der beiden gespeicherten Dosierwalzen 1 belegtes Fach 32 des Revolvermagazins 2 nach oben zeigt und für das Bedienpersonal zugänglich ist. Die in dem nach oben zeigenden Fach 32 befindliche Dosierwalze 1 kann - ermöglicht durch die geschlossene Schutzabdeckung 6 - im laufenden Druckbetrieb ausgetauscht oder gereinigt werden. Im Falle des Austausches erfolgt im dreizehnten Schritt auch ein Entriegeln der Dosierwalzen 1 im Revolvermagazin 2 durch eine dementsprechende Verstellung der Scheibe 27.
• 14 zeigt die Vorrichtung während des Walzenaustausches im laufenden Druckbetrieb. Im dargestellten Zwischenzustand ist die vorerst nicht mehr benötigte, „alte“ Dosierwalze 1 bereits aus dem Revolvermagazin 2 entnommen und ist die demnächst benötigte, „neue“ Dosierwalze aber noch nicht in das nach oben zeigende freie Fach 32 eingesetzt.

The control device 8 controls the actuator 5 of the lifting device 4 and the actuator 9 of the protective cover 6 according to a program running in it. The corresponding process sequence is shown in the following figures based on its successive phases: 1-14 and is described below:

• 1 shows a first step in which the driver claw 39 of the metering roller 1 located in the roller lock 3 is aligned in the engagement direction 20. The separate motor 16 rotates both coupling halves 17, 18 of the coupling 15, which is still closed at this time, into the required rotational position.
• 2 shows a second step in which the revolver magazine 2 is rotated by the actuator of the revolver magazine 2 into a first rotational position in which an empty compartment 32 of the revolver magazine 2 points approximately towards the roller lock 3, and the protective cover 6 is adjusted out of the transport path 7 by the actuator 9 of the protective cover 6.
• 3 shows a third step in which the lock 13 for the metering rollers 1 in the revolver magazine 2 is released and the roller lock 3 is unlocked. It does not matter whether the lock 13 is released or the roller lock 3 is unlocked first or whether both occur simultaneously.
• 4 shows a fourth step in which the metering roller 1 located in the roller lock 3, which was used in the previous print job, is lifted out of the roller lock 3 by the roller holder 10 of the lifting device 4 and conveyed along the transport path 7 into the empty compartment 32 of the revolver magazine 2.
• 5 shows a fifth step in which the metering rollers 1 are locked in the revolving magazine 2 by turning back the disk 27. The disk 27 is turned clockwise with respect to the drawing until the hooks of the disk 27 engage behind the axle pins 37 of the metering rollers 1.
• 6 shows a sixth step in which the roller holder 10 without a metering roller 1 is moved along the guide 29 away from the revolver magazine 2 by the actuator 5 of the lifting device 4 into a distance position in which the roller holder 10 is located outside a rotation range of the revolver magazine 2 and cannot collide with it when the revolver magazine 2 rotates.
• 7 shows a seventh step in which the revolver magazine 2 is rotated into a second rotational position in which a compartment 32 in which a metering roller 1 required for the subsequent print job is stored points approximately towards the roller lock 3.
• 8th shows an eighth step in which the roller holder 10 moves along the guide 29 towards the revolver magazine 2 until the roller holder 10 is in a transfer position in which the revolver magazine 2 can transfer the metering roller 1 from the downward-facing compartment 32 to the roller holder 10.
• 9 shows a ninth step in which the locking mechanism 13 for the metering rollers 1 in the revolving magazine 2 is opened, for which purpose the disk 27 is rotated anti-clockwise so that the hooks of the disk 27 come out of contact with the axle pins 37 of the metering rollers 1. As a result, the metering roller 1 falls from the downward-facing compartment 32 into the roller holder 10 positioned underneath and open at the top, through which the metering roller 1 is received.
• 10 shows a tenth step in which the metering roller 1 received by the roller holder 10 is transported by the lifting device 4 in a direction 12 along the transport path 7 to the roller lock 3 and deposited therein and then the empty roller on The carriage 10 is moved further in the same direction 12 until it reaches a parking position 11 and is positioned there.
• 11 shows an eleventh step in which the locking mechanism 13 for the metering rollers 1 in the revolver magazine 2 is closed again by turning the disk 27 clockwise and the roller lock 3 is also locked again.
• 12 shows a twelfth step in which the protective cover 6 is moved into the closed position by the actuator 9 of the protective cover 6. The device is then ready for printing operation.
• 13 shows an optional, thirteenth step in which the revolver magazine 2 is rotated into a third rotational position in which a compartment 32 of the revolver magazine 2 occupied by one of the two stored metering rollers 1 faces upwards and is accessible to the operating personnel. The metering roller 1 located in the upward-facing compartment 32 can - made possible by the closed protective cover 6 - be replaced or cleaned during ongoing printing. In the case of replacement, the metering rollers 1 in the revolver magazine 2 are also unlocked in the thirteenth step by adjusting the disk 27 accordingly.
• 14 shows the device during roller replacement during ongoing printing operation. In the intermediate state shown, the "old" metering roller 1, which is no longer required for the time being, has already been removed from the revolver magazine 2 and the "new" metering roller, which will soon be required, has not yet been inserted into the free compartment 32 pointing upwards.

List of reference symbols

1

Dosing roller

2

Revolver magazine

3

Roller lock

4

Lifting device

5

Actuator (of the lifting device 4)

6

Protective cover

7

Transport path

8th

Control device

9

Actuator (of the protective cover 6)

10

Roller holder

11

Parking position

12

Direction

13

Locking

14

drive shaft

15

coupling

16

Separate engine

17

first coupling half

18

second coupling half

19

sensor

20

Direction of intervention

21

first support

22

second support

23

Support surface

24

Rest

25

Wedge surface

26

suspension

27

disc

28

Hook

29

guide

30

gear

31

Chain

32

Academic subject

33

axis

34

roller bearing

35

Chain drive

36

pinion

37

Axle journal

38

Roller bales

39

Driving claw

40

Index disc

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was 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 accepts no liability for any errors or omissions.

Cited patent literature

• DE 10315191 B4 [0002]
• EP1767362A2 [0002]

Claims (9)

Device for changing metering rollers (1) in a printing machine, comprising a revolver magazine (2) for the metering rollers (1), a roller lock (3), a lifting device (4) with an actuator (5) for transporting the metering rollers (1) from the revolver magazine (2) into the roller lock (3) and back again, and a protective cover (6) which can be adjusted optionally into a closed position in which the protective cover (6) blocks a transport path (7) of the metering rollers (1) located between the revolver magazine (2) and the roller lock (3), and into an open position in which the protective cover (6) clears the transport path (7), characterized in that the actuator (5) of the lifting device (4) is controlled by a control device (8) depending on whether the protective cover (6) is in the open position or the closed position, that the lifting device (4) has a roller holder (10) for the Dosing rollers (1), that a parking position (11) is determined for the roller holder (10), in which the roller holder (10) is located during a printing operation, and that the roller lock (3) is located along the transport path (11) between the revolver magazine (2) and the parking position (11). Device according to Claim 1 , characterized in that an actuator (9) is provided for adjusting the protective cover (6) into the closed position and into the open position. Device according to Claim 2 , characterized in that the control device (8) is programmed such that the actuator (9) of the protective cover (6) and the actuator (5) of the lifting device (4) are controlled in a coordinated manner by the control device (8). Device according to Claim 2 or 3 , characterized in that the control device (8) is programmed such that the actuator (9) of the protective cover (6) automatically opens the protective cover (6) before each roll changing operation and automatically closes it after each roll changing operation. Device according to one of the Claims 2 until 4 , characterized in that the control device (8) is programmed such that the protective cover (6) is automatically adjusted out of the transport path (7) of the metering roller (1) by the actuator (9) of the protective cover (6) when the respective metering roller (1) is transported along the transport path (7) by the lifting device (4). Device according to one of the Claims 1 until 5 , characterized in that the roller holder (10) is adjustably mounted along the transport path (11), wherein the roller holder (10) with the metering roller (1) accommodated therein and required for the subsequent printing operation is adjusted in a direction (12) from the revolver magazine (2) to the roller lock (3) and wherein the roller holder (10) in the empty state is adjusted further in said direction (12) into the parking position (11) after the metering roller (1) has been inserted into the roller lock (3). Device according to one of the Claims 1 until 6 , characterized in that the revolver magazine (2) has a locking mechanism (13) for simultaneously locking and simultaneously unlocking several metering rollers (1) in the revolver magazine (2). Device according to one of the Claims 1 until 7 , characterized in that the printing press has at least one main motor, that a drive shaft (14) projects into the roller lock (3), that a coupling (15) is provided for coupling the metering roller (1) inserted into the roller lock (3) to the drive shaft (14), and that the drive shaft (14) can be driven by a separate motor (16) which is different from each main motor of the printing press. Device according to Claim 8 , characterized in that the coupling (15) has a first coupling half (17) on the drive shaft (14) and a second coupling half (18) on the dosing roller (1), that a sensor (19) is provided for detecting a specific rotational position into which the first coupling half (17) can be rotated by the separate motor (16), and that in the specific rotational position an engagement direction (20) of the coupling (15) runs parallel to the transport path (11), wherein the lifting device (4) enables the second coupling half (18) to be moved in the engagement direction (20) when coupling is engaged and against the engagement direction (20) when disengaging.

Images