EP2117843B1 - Method for operating a damping system, damping system, and printing group - Google Patents

Abstract

A method for operating a dampening system of a printing group of a printing machine, especially a web-fed rotary printing press, the dampening system comprising a dampening means dosing device provided with a plurality of dosing units, a dampening system rolling mill drive having at least one dampening system roller, and at least one dampening means application roller. The application of the dampening means is adapted to the width of the material to be printed or to widths of the sides of the material to be printed.

Description

The invention relates to a dampening unit according to the preamble of claim 1 and a printing unit according to the preamble of claim 10.

Printing units of printing machines have a form cylinder, a rolling on the forme cylinder transfer cylinder, a rolling on the transfer cylinder impression cylinder, an inking unit and a dampening unit. With the help of the inking unit, ink can be applied to the forme cylinder, namely at least one printing form positioned on the same, which carries the page to be printed. With the help of the dampening dampening solution can be applied to the or each arranged on the form cylinder printing form. The forme cylinder is also referred to as a plate cylinder.

The transfer cylinder, namely at least one blanket positioned on the same, transfers the printing ink to a printing substrate, wherein the printing substrate can be moved through a printing nip formed between the transfer cylinder and the impression cylinder. The transfer cylinder is also referred to as a rubber cylinder.

In rotary printing presses, several printing units are usually combined to form a printing unit, in which case the counter-pressure cylinder of a printing unit of a printing unit is designed either as a so-called satellite cylinder, which rolls on a plurality of transfer cylinders of different printing units of the printing unit, or as a transfer cylinder of another printing unit of the printing unit.

As already stated, dampening solution is applied with the aid of a dampening unit to the or each printing form positioned on the forme cylinder, wherein a dampening unit comprises a dampening agent metering device having a plurality of metering units which applies the dampening solution to a dampening roller of a dampening unit roller train immediately downstream of the dampening solution metering device. With the help of the or each dampening roller of the dampening unit, the dampening solution is conveyed in the direction of at least one dampening roller, which rolls on the forme cylinder and thus ultimately applies the dampening solution to the or each placed on the form cylinder printing form.

The dampening solution application to the or each printing form positioned on the forme cylinder must be adapted to the width of the print pages to be printed in order to ensure optimum print quality. It should be noted that a printing form can be used to print one or more printed pages. Then, when a printing form is used for printing a plurality of printed pages, these multiple printed pages can be arranged with respect to the forme cylinder either in the axial direction next to each other or in the circumferential direction one behind the other.

In particular, when different printed products are to be produced, which differ with regard to the width of the printed pages to be printed or the width of the substrate to be printed, the application of the fountain solution is difficult in terms of optimum print quality.

US 5,025,722 shows a dampening unit, wherein the metering units are movable.

On this basis, the present invention is based on the problem of creating a novel dampening unit and a novel printing unit to allow optimum print quality.

For the purposes of the present invention, it is proposed for the first time to adapt the fountain solution application of a dampening unit to the width of the substrate or the width of the printed page. This can provide optimal print quality.

Inventive dampening units are defined in the independent claim 1. The printing unit according to the invention is defined in independent claim 10.

Fig. 1:

eine schematisierte Darstellung eines Druckwerks;

Fig. 2:

einen Formzylinder eines Druckwerks mit vier auf dem Formzylinder angeordneten Druckformen zum Drucken relativ breiter Druckseiten;

Fig. 3:

einen Formzylinder eines Druckwerks mit vier auf dem Formzylinder angeordneten Druckformen zum Drucken relativ schmaler Druckseiten;

Fig. 4:

einen schematisierten Ausschnitt aus einem Feuchtwerk im Bereich einer Feuchtmitteldosiereinrichtung und einer derselben unmittelbar nachgeordneten Feuchtwerkwalze in Draufsicht;

Fig. 5:

den Ausschnitt der Fig. 4 in Seitenansicht;

Fig. 6:

einen schematisierten Ausschnitt aus einem Feuchtwerk im Bereich einer Feuchtmitteldosiereinrichtung und einer derselben unmittelbar nachgeordneten Feuchtwerkwalze in Draufsicht;

Fig. 7:

den Ausschnitt der Fig. 6 in Seitenansicht;

Fig. 8:

ein Detail des Ausschnitts der Fig. 6;

Fig. 9:

einen schematisierten Ausschnitt aus einem erfindungsgemäßen Feuchtwerk nach einem ersten Ausführungsbeispiel der Erfindung in einer Ansicht analog Fig. 7;

Fig. 10:

ein Detail des Ausschnitts der Fig. 9;

Fig. 11:

einen schematisierten Ausschnitt aus einem erfindungsgemäßen Feuchtwerk nach einem zweiten Ausführungsbeispiel der Erfindung im Bereich einer Feuchtmitteldosiereinrichtung und einer derselben unmittelbar nachgeordneten Feuchtwerkwalze in Draufsicht;

Fig. 12:

den Ausschnitt der Fig. 11 in Seitenansicht;

Fig. 13:

eine Alternative zum Ausschnitt der Fig. 12 in perspektivischer Seitenansicht;

Fig. 14:

einen Randabschnitt eines erfindungsgemäßen Feuchtwerks in einem ersten Zustand; und

Fig. 15:

den Randabschnitt der Fig. 14 in einem zweiten Zustand.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

Fig. 1:

a schematic representation of a printing unit;

Fig. 2:

a form cylinder of a printing unit with four arranged on the forme cylinder printing forms for printing relatively wide printed pages;

3:

a form cylinder of a printing unit with four arranged on the forme cylinder printing forms for printing relatively narrow printed pages;

4:

a schematic section of a dampening unit in the range of Feuchtmitteldosiereinrichtung and a same immediately downstream dampener roller in plan view;

Fig. 5:

the clipping of the Fig. 4 in side view;

Fig. 6:

a schematic section of a dampening unit in the range of Feuchtmitteldosiereinrichtung and a same immediately downstream dampener roller in plan view;

Fig. 7:

the clipping of the Fig. 6 in side view;

Fig. 8:

a detail of the clipping of the Fig. 6 ;

Fig. 9:

a schematic section of a damping unit according to the invention according to a first embodiment of the invention in a similar view Fig. 7 ;

Fig. 10:

a detail of the clipping of the Fig. 9 ;

Fig. 11:

a schematic section of a dampening system according to the invention according to a second embodiment of the invention in the range of a dampening agent metering device and a dampening roller immediately following it in plan view;

Fig. 12:

the clipping of the Fig. 11 in side view;

Fig. 13:

an alternative to the neck of the Fig. 12 in perspective side view;

Fig. 14:

an edge portion of a dampening unit according to the invention in a first state; and

Fig. 15:

the edge section of Fig. 14 in a second state.

Fig. 1 shows very schematically the basic structure of a printing unit 20 of a printing unit of a web-fed rotary printing press, wherein the printing unit 20 comprises a forme cylinder 21, a transfer cylinder 22, an inking unit 23 and a dampening unit 24. On the forme cylinder 21 of in Fig. 1 shown printing unit 20 a plurality of printing plates 25 are arranged, being applied to the arranged on the forme cylinder 21 printing plates 20 by means of the inking unit 23 ink and with the help of the dampening unit 24 dampening solution. From the inking unit 23 only inking rollers 26 are shown, which roll on the forme cylinder 21. The applied to the printing plates 25 ink is using the Transfer cylinder 21, on which at least one blanket is stretched, applied to a printing material to be printed 27, wherein for this purpose cooperates with the transfer cylinder 22, a non-illustrated impression cylinder.

The dampening unit 24 has a dampening agent metering device 28, which several in Fig. 1 comprising metering units not shown. With the help of the metering units of the dampening solution metering device 28 fountain solution is applied to one of the dampening agent metering device 28 immediately downstream dampening roller 29 of a dampening unit roller 30. In the illustrated embodiment, the dampening unit 30 includes a total of three dampening rollers, namely the dampening metering device 28 immediately downstream dampening roller 29, a rolling on this dampening roller 29 dampening roller 31. And continue a dampening roller 32, which rolls on the forme cylinder 21 and thus ultimately the dampening solution on on the printing cylinder 25 arranged forms 21 applies.

FIGS. 2 and 3 show the forme cylinder 21 of a printing unit 20 in solitary representation, wherein on the forme cylinder 21 in Fig. 2 seen in the axial direction of the same four relatively wide printing plates 25 are arranged side by side. According to Fig. 3 are seen in the axial direction of the forme cylinder 21 four relatively narrow pressure plates 25 arranged on the same. A comparison of FIGS. 2 and 3 can be taken that depending on the width of the printing plates 25 and the substrate width of the printing material 27 changes. In the following, it should be assumed that each of the printing plates 25 serves to print a printed page on the respective printing material 27.

To ensure optimum print quality, moisturizing agent 25 must be optimally applied to the printing forme 25 positioned on the forme cylinder 21 of the printing unit 20 by means of a dampening unit 24. This is done according to the invention such that the fountain solution to the substrate width of the printing material 27 and to the width of the on the substrate 27 to is adapted to printing printed pages. For this purpose, dampening units, as described below with reference to Fig. 4 to 15 will be described in more detail.

4 and 5 show a schematized section of a dampening unit in the area of a dampening agent metering device 28a and a dampening roller roller 29a immediately downstream of the dampening agent metering device 28a. In the embodiment of 4 and 5 the dampening solution metering device 28a comprises a plurality of metering units 33 and 34 for dampening solution, wherein all the metering units 33 and 34 are stationary in relation to the dampening roller 29a immediately downstream of the dampening agent metering device 28a. In order to adapt the damping agent application to the substrate width or to the widths of printed pages to be printed on the printing units 33 and 34 of the dampening agent metering device 28a are individually controlled so that depending on the substrate width or the width of the printed pages, a first subset of metering units and active a second subset of dosing units is inactive.

In the example of 4 and 5 The metering units form two groups, namely a first group of metering units 33 and a second group of metering units 34. Each of these two groups of metering units is adapted to a different substrate width and thus a different width of printed pages. Within each group, the respective metering units 33 and 34 are juxtaposed in the axial direction. As Fig. 5 can be removed, in this example, the metering units 33 and 34 of the different groups are arranged one above the other, on a circular arc, so that all metering units 33 and 34 of the dampening roller 29a have an identical distance.

In the example shown the 4 and 5 the metering units 33 are then used for dampening application, if on the forme cylinder 21 according to Fig. 3 relatively narrow printing plates are arranged with relatively narrow print pages. Are, however, on the forme cylinder 21 according to Fig. 2 arranged relatively wide printing plates for relatively wide printed pages, the dampening solution is applied by means of the metering units 34 of the dampening agent metering device 28a.

In the example of 4 and 5 the metering units 33 and 34 are designed as nozzle units, wherein in particular two nozzle units are present per pressure side width. With the help of such nozzle units dampening solution can be sprayed in a discontinuous manner on the dampening roller 29a.

Show a schematic section of another dampening unit Fig. 6 to 8 , where in 6 and 7 again, a dampening agent metering device 28b and a dampening agent metering device 28b immediately downstream of the dampening roller 29b is shown. Also in the embodiment of Fig. 6 to 8 the dampening solution metering device 28b has several metering units 35 for dampening solution, wherein at least one of these metering units 35, in the example shown, all metering units 35, is designed to be movable in the axial direction thereof with respect to the dampening roller 29b.

For this purpose, the metering units 35 are movably mounted on a guide rail 36. In order to adapt the dampening solution application to the printing material width or printing page width, all movable metering units 35 can be controlled individually such that at least one of the movable metering units 35 changes its position with respect to the dampening unit roller 29b in the axial direction of the same with changing substrate width or changing printing page widths. So are in Fig. 6 Arrows 37 show displacements of the metering units 35 in the axial direction of the dampening roller 29b in order to adapt the dampening unit to decreasing printing page widths or a decreasing width of the printing substrate.

In the example of Fig. 6 to 8 Each metering unit 35 of the dampening agent metering device 28b is assigned a separate drive 38 in order to be able to move each of the metering units 35 along the guide rail 36 in an intrinsic motor manner. The drive 38 interacts with a drive pinion 39 for this purpose.

In contrast to the example of Fig. 6 to 8 is according to a first embodiment of the present invention according to FIGS. 9 and 10 a common drive is associated with a plurality of, in particular all, movable metering units 40 of a dampening agent metering device 28c, in order to move the metering units 40 in the axial direction of the dampening roller 29c.

The in FIGS. 9 and 10 not shown drive then drives a threaded rod 41, wherein the threaded rod 41 cooperates with corresponding mating thread carriers 42 of the metering units 40. In this case, the threaded rod 41 preferably has individual threaded rod sections for at least some, in particular for all, movable metering units 40 with regard to thread direction and / or thread pitch, on which the respective metering units 40 are mounted with the support 42 having the corresponding mating thread. By changing or adapting the thread direction, deviating directions of movement of the metering units 40 can be realized. By deviating thread pitches 41 different translational displacement paths of the metering units 40 can be realized for the metering units 40 with the same rotation of the threaded rod 41.

In the embodiments of the Fig. 6 to 10 the metering units are again designed as spray units. Since in dampening units with spray units, the ratio of the overlap of the respective spray cone to the distance of the inking roller, which is immediately downstream of the Feuchtmitteldosiereinrichtung important, the axial displacement of the metering units, a radial component of motion can be superimposed.

In the embodiments of the Fig. 1 to 10 come as dosing units spray units are used, with which, as already stated, dampening solution is preferably sprayed discontinuously on the dampening unit downstream of the respective dampening metering.

In contrast show Fig. 11 to 13 Embodiments of the present invention, in which the metering units of the respective dampening metering are formed as centrifugal units, with the aid of which dampening solution continuously centrifuged by centrifugal forces and is applied to the respective dampening metering device downstream dampening roller.

To show Fig. 11, 12th a section of a dampening unit according to the invention according to a second embodiment of the present invention, again in the range of a dampening agent metering device 28d and a dampening agent metering device 28d immediately downstream dampening roller 29d. The dampening agent metering device 28d in turn has a plurality of metering units 43, each of the metering units 43 being mounted on a threaded rod 45 via a carrier 44. The threaded rod 45 is assigned a drive 46, which drives the threaded rod 45 and thus adjusts all the metering units 43 of the dampening agent metering device 28d together. In this respect, the embodiment of the FIGS. 11 and 12 with the embodiment of FIGS. 9 and 10 so that reference may be made to the above with respect to these details.

In the embodiment of FIGS. 11 and 12 the metering units 43 are designed as centrifugal units, wherein all metering units 43 have a common rotor 56, by means of which dampening solution can be spun in the direction of the dampening roller 29d. Each metering unit 43 has an aperture 47, with the aid of which the amount of dampening solution can be adjusted. Fig. 12 shows a shutter 47 in two different positions, namely in a closed position in solid lines and in an open position in dotted lines, with the aperture 47 open the dampening solution in the sense of the cone 48 is thrown onto the dampening roller 29d. To open and close the aperture 47, a drive 49 is associated with each dosing unit 43. Preferably, two metering units 43 designed as centrifuging units act together per printing page width, the apertures 47 of the respectively cooperating metering units 43 overlapping each other.

In order to adapt the dampening agent metering device 28d to changing printing page widths or a changing printing material width, the metering units 43 cooperating in each printing page width can be moved relative to one another, whereby at least one of the two cooperating metering units 43 or each of these can be moved in the axial direction of the dampening printing roller 29d.

Fig. 13 shows a to the dosing unit 43 of Fig. 12 alternative dosing unit 50, which in turn is designed as a centrifugal unit. In the dosing unit 43 of Fig. 12 is the drive 49 for actuating the aperture 47 together with the metering unit 43 movable. In the dosing unit 50 of the Fig. 13 In contrast, a drive 51, which serves to actuate the aperture 47, designed to be stationary, wherein the drive 51 is connected via a flexible shaft 52 and a coupling 53 to the aperture 47 to be actuated. As a result, an axial compensation between the stationary drive 51 and the aperture 47 axially displaceable together with the metering unit 47 is possible.

FIGS. 14 and 15 show a section of the dampening unit according to the invention of the embodiment of FIGS. 9 and 10 in an edge region of the corresponding dampening agent metering device 28c in order to make it clear that edge portions of the dampening agent metering device adjoining the outer metering units 40 seen in the axial direction are at least partially partitionable. In this way it can be ensured that no dampening solution or only a reduced amount of dampening solution reaches the corresponding form cylinder on the left and / or right of the printing material to be printed. So this foreclosure in the peripheral areas can be adapted to different substrate widths or print page widths, it must be made the same adjustable.

To show FIGS. 14 and 15 a Randabschottung 54 of Feuchtmitteldosiereinrichtung 28c, according to FIGS. 14 and 15 is executed telescopically. In the embodiment shown, the telescopic edge partition 54 has three segments which are displaceable relative to each other.

One of the segments is stationary, while the other two segments are slidable. By way of a support 55, one of the segments of the telescopic edge partition 54 is mounted on the threaded rod 21, this support 55 having a threaded thread corresponding to the mating thread. For reasons of space, the use of a telescopic Randabschottung 54 is advantageous. However, it can also find a roller blind Randabschottung use.

The present invention can be applied in all cases in which a dampening unit must be adapted to a changing printing material width or changing printing page widths. In this case, in the case of a changing printing material width of a printing material to be printed, the same can be moved either centrally or also flush relative to a machine side through the corresponding printing unit of the printing press.

All motorized adjustments of the dampening units can be carried out automatically on the basis of preset values stored in the press.

LIST OF REFERENCE NUMBERS

20

printing unit

21

form cylinder

22

transfer cylinder

23

inking

24

dampening

25

printing form

26

Inking roller

27

substrate

28, 28a, 28b, 28c, 28d

Feuchtmitteldosiereinrichtung

29, 29a, 29b, 29c, 29d

Pan roll

30

Feuchtwerkwalzenzug

31

Pan roll

32

Dampener roller

33

dosing

34

dosing

35

dosing

36

guide rail

37

arrow

38

drive

39

pinion

40

dosing

41

threaded rod

42

carrier

43

dosing

44

carrier

45

threaded rod

46

drive

47

cover

48

cone

49

drive

50

dosing

51

drive

52

wave

53

clutch

54

Rand foreclosure

55

carrier

56

rotor

Claims (10)

1. A dampening unit of a printing couple of a printing press, particularly of a reel-fed rotary printing press, with a dampening solution metering device, in order to apply dampening solution onto a dampening unit roller of a dampening unit roller train directly arranged downstream of the dampening solution metering device, and with at least one dampening application roller, by means of which the dampening solution conveyed with the help of the dampening unit roller train comprising the at least one dampening unit roller can be applied onto at least one printing form positioned on a form cylinder of the printing couple, wherein the dampening solution metering device comprises a plurality of metering units, wherein at least one metering unit (35; 40; 43) with respect to the dampening unit roller (29b; 29c; 29d) directly arranged downstream of the dampening solution metering device (28b; 28c; 28d) is designed moveable, and in that for adapting the dampening solution application to a substrate width or to widths of printing pages to be printed onto the substrate, the moveable metering units (35; 40; 43) can be individually activated in such a manner that at least one of the moveable metering units changes its position with respect to the dampening unit roller (29b; 29c; 29d) in axial direction of the latter, characterized in that a plurality, particularly all moveable metering units of the dampening solution metering device (28c; 28d) are assigned a common drive for the axial moving of the respective metering units relative to the dampening unit roller and all moveable metering units (40, 43) which are assigned a common drive, are mounted on a threaded rod (41; 45) driven by the drive, wherein a carrier of each metering unit has a mating thread corresponding to the threaded rod.
2. The dampening unit according to Claim 1, characterized in that all metering units (35; 40; 43) of the dampening solution metering device (28b; 28c; 28d) with respect to the dampening unit roller (29b; 29c; 29d) directly arranged downstream of the dampening solution metering device are of a moveable design.
3. The dampening unit according to Claim 1 or 2, characterized in that each moveable metering unit (35) of the dampening solution metering device (28b) is assigned a separate drive (38) for the axial moving of the respective metering unit (35) relative to the dampening unit roller (29b).
4. The dampening unit according to Claim 1, characterized in that the threaded rod (41; 45) for at least some, particularly for all moveable metering units comprises a threaded rod section that is individual with respect to thread direction and/or thread pitch, on which the respective metering unit (40; 43) is mounted with the carrier (42; 44) comprising the corresponding mating thread.
5. The dampening unit according to any one or a plurality of the Claims 1 to 4, characterized in that the edge sections of the dampening solution metering device following the seen in axial direction outer metering unit can be separated at least partially.
6. The dampening unit according to Claim 5, characterized in that the outer metering units and the edge separation overlap at least partially.
7. The dampening unit according to any one of both of the Claims 5 and 6, characterized in that the edge sections are designed telescope-like or roller-like.
8. The dampening unit according to any one or a plurality of the preceding claims, characterized in that the metering units (33, 34; 35; 40) are designed as spray units.
9. The dampening unit according to any one or a plurality of the preceding claims, characterized in that the metering units (43; 50) are designed as centrifugal units.
10. A printing couple of a printing press, particularly of a reel-fed printing press, with a form cylinder, with a transfer cylinder rolling off the form cylinder, with an impression cylinder rolling off the transfer cylinder, and with an inking couple, wherein with the inking couple printing ink can be applied to at least one printing form positioned on the form cylinder, characterized by a dampening unit according to any one or a plurality of the Claims 1 to 9 in order to apply dampening solution on the or each printing form positioned on the form cylinder.

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