EP1820648B1 - Inking system and method for determination of a configuration status of the same - Google Patents

Description

The invention relates to an inking unit for an offset rotary printing machine for processing a printing material in the sheet-fed, or in the roll printing process. The invention is also directed to a method for determining a setting state of the inking unit.

Coloring units for offset printing machines usually comprise a plurality of rollers serving for color transfer, via which the respective printing ink can be transferred to the printing forme sufficiently uniformly. These inking units can be designed, for example, as multi-roll inking units, or as color inking inking units. The feed of the ink to the first (e.g., ductor) roller of the inking unit can be adjusted via ink knives (or ink slides), the distance of which from the roller is adjustable by means of regulating and zone screws. The dosing gap defined between the inking knife and the roller can be adjusted zonally to different gap dimensions within the format width in order to take into account the possibly different ink consumption in the respective zone. This area-specific color consumption can be determined beforehand on the basis of data for the respective subject. In these inking units are also typically referred to as "impeller" designated rollers. These V erreiber be moved during its rotation about its longitudinal axis in the axial direction and thereby cause a transverse displacement and trituration of the ink in the corresponding nip.

In the widespread inking the stroke of the distributor rollers is adjustable adjustable. Changes can be made by a person skilled in the art with regard to certain subjects, for example if a fine font and a full area are next to each other, or if several colors are led side by side in a shared color box.

DE 101 46 071 A1 discloses an inking unit of a printing press associated with a printing form and comprising a first rubbing roller and a second rubbing roller. The inking unit is characterized in that the first rubbing roller with two inking rollers is simultaneously in rolling contact and that the first rubbing roller oscillates axially more slowly and is arranged closer to the printing form than the second rubbing roller.

US 2005/0016399 A1 discloses a drive for a printing unit with an inking unit. The inking unit comprises a first, individual distributor roller, which is arranged directly upstream of the applicator rollers in the ink flow. Another second, individual distributor roller is indirectly arranged upstream in the color flow of the first distributor roller.

DE 36 14 555 A1 discloses a method and arrangement for adjusting the point of application of lateral rubbing for a printing press. In the methods, the areal coverage distribution on a printing plate is used in conjunction with parameters given by the respective printing press which influence the color distribution on the printed sheet for mathematically determining the optimum application time of the lateral trituration. In this case, the determination of the computer of a measuring device (eg plate scanner), which area coverage distribution determined, carried out or arranged by a control station of the press computer.

The invention has for its object to provide solutions by which it is possible to allow the color transfer from the field of the ink fountain on the printing plate in a respective subject invoice manner and thereby counteract the problem of color drop and the stenciling effect.

This object is achieved by an inking unit for an offset printing machine with all features of claim 1.

This makes it possible in an advantageous manner to provide an inking unit for an offset printing machine, in which by tuning the rubbing motion of at least two inking rollers of the inking unit to each other a printing optimization with respect to different Sujet- and customer requirements is possible. On the basis of the concept according to the invention, it becomes possible to provide an inking unit in which by tuning the Verreibungsbewegung the Verreibungswalzen problems are reduced in terms of color waste, as well as with respect to the stenciling tendency.

The inking unit according to the invention can be designed so that the adjustment of the Verreibungsantriebseinrichtung using actuators is fully automatic. The setting of the inking unit according to the invention can take place here without extending the set-up times occurring when changing over the print job.

According to a particularly preferred embodiment of the invention, the inking unit is designed such that the phase position of the distributor rollers to each other is continuously variable. It is also possible to meet certain, in particular frequently occurring, subject-specific inking settings by means of specially prepared adjustment points.

The phase position of the lifting movement of the at least two distributor rollers relative to each other is preferably adjustable over an angular range of at least π / 2. Preferably, however, the Verreibungsantriebseinrichtung is formed such that the phase angle in an angular range up to 2π (360 °) is variable.

The Verreibungsantriebseinrichtung invention is designed according to a particular embodiment such that not only the phase position of the lifting movement of the distributor rollers to each other, but in particular the stroke of the respective Verreiberwalze is adjustable changeable per se. Thus, it is in particular possible to set the Verreibungshub the (seen in the printing direction) first Verreiberwalze larger than the stroke of the (seen in the printing direction) second Verreiberwalze.

It is possible to design the Verreibungsantriebseinrichtung so that the drive of the Verreiberwalzen via a common gear train, in particular a common main eccentric takes place. Alternatively, however, it is also possible to design the Verreibungsantriebseinrichtung so that a self-contained drive train is provided for each Verreiberwalze. It is possible, the Verreibungsantriebseinrichtung in such a way that it is operated synchronously with the machine, wherein the drive power is diverted by mechanical means from the drum or cylinder drive system. Alternatively, it is also possible to equip the Verreibungsantriebseinrichtung with an independent, in particular electromechanical and control technology synchronized drive system.

According to a further embodiment of the present invention, it is possible to pre-store the dampening unit according to the invention, wherein also in this dampening unit, the phase position of the axial lifting movement of one (or more) dampening drive roller (s) relative to the axial lifting movement of one of the distributor rollers of the inking unit is preferably adjustable adjustable ,

In procedural terms, the object mentioned above is also achieved by a method according to claim. 9

This makes it possible in an advantageous manner, in the context of the preparation of a print job to determine an advantageous setting of the inking unit with respect to the lifting movement of the distributor rollers and then to complete the print job with an optimized Verreiberkinematik.

The optimum adjustment of the drive drive device with regard to the color distribution on the respective forme cylinder can take place taking into account numerous image, machine, and color parameters, the cooperative consideration of which is otherwise only conditionally possible.

According to a particularly preferred embodiment of the method according to the invention is determined in the context of determining the setting state for the Verreiberantrieb both the most suitable for the respective Verreiberwalze roller stroke, and according to the invention with respect to the predetermined color distribution most appropriate appearing phase offset between the strokes of at least two Verreiberwalzen.

It is possible to take into account economic criteria, in particular with regard to a possible low-wear operation of the inking unit selectable priorities in determining the setting state for the Verreiberantrieb.

The method according to the invention is preferably carried out as part of an original analysis section preparatory to the printing process, so that the optimum setting states for the respective inking unit are already determined before or at the initiation of the printing job. It is possible, if necessary, to change these setting states within the framework of analysis procedures of the print image which are carried out continuously or at certain intervals. Preferably, the change of the setting state of the Verreiberantriebs fully automatically using actuators from a central control station without interrupting the printing operation.

It is possible to store the setting states of the operator drive selected for the respective print job in a print job-specific manner and to reuse them in the case of such recurring print jobs.

Figur 1

eine Schemadarstellung zur Veranschaulichung eines möglichen Aufbaus eines Farbwerkes mit mehreren Verreiberwalzen, wobei die Hubphasenlage von wenigstens zwei Verreiberwalzen dieses Farbwerks zueinander einstellbar veränderbar ist,

Figur 2

eine Schemadarstellung zur Veranschaulichung der unterschiedlichen Hübe und Hubphasenlage der in Figur 1 dargestellten, unteren und den Farbauftragswalzen zugeordneten Farbreiberwalzen;

Figur 3

eine perspektivische Skizze zur Veranschaulichung einer manuell verstellbaren Verreiberwalzenantriebseinrichtung, die als solche eine Einstellung unterschiedlicher Hubphasenlagen der Verreiberwalzen zueinander ermöglicht.

Further details and features of the invention will become apparent from the following description taken in conjunction with the drawings. It shows:

FIG. 1

a schematic representation to illustrate a possible construction of an inking unit with a plurality of distributor rollers, wherein the Hubphasenlage of at least two Verreiberwalzen this inking unit is adjustable to each other adjustable,

FIG. 2

a schematic representation to illustrate the different strokes and Hubphasenlage the in FIG. 1 illustrated, lower and the inking rollers associated Farbreiberwalzen;

FIG. 3

a perspective sketch for illustrating a manually adjustable Verreiberwalzenantriebseinrichtung, as such, allows adjustment of different Hubphasenlagen the distributor rollers to each other.

In FIG. 1 an inking unit for a sheet-fed offset printing machine is shown. This inking unit comprises an ink fountain 1, a Farbduktor 2, a color lifter 3, a spreading roller 4 and a plurality of complaint rollers 5. The inking unit further comprises a plurality of transfer rollers and ink driver 7a, 7b, 7c, 7d and ultimately on a forme cylinder 9 pending inking rollers or applicator rollers. 8 ,

The ink drivers 7a, 7b, 7c, 7d are designed in such a way that they can be displaced in the axial direction by a certain distance, for example in the range of +/- 20 mm, in a machine-synchronous manner via a distributor roller drive device, which is not shown in detail in this illustration.

In the embodiment shown here, the said distributor roller drive device is designed such that the lifting phase position of at least two ink distributor rollers or distributor rollers, in particular of the ink distributor rollers 7c and 7d, is adjustable relative to one another. Preferably, the Verreibungsantriebseinrichtung is further designed such that in addition to the Hubphasenlage and the stroke amplitude of the respective Farbreiberwalze 7c, 7d is print job specific adjustable.

As can be seen from the illustration, the inking rollers 7c, 7d are the inking rollers immediately upstream of the inking rollers 8 in the ink flow. The inking rollers 7a and 7b are closer to the ink fountain, as seen in the direction of ink flow. According to the invention, the phase position as well as the stroke of each of the ink-jet rollers 7a, 7b, 7c, 7d shown here can be variably adjusted relative to one another.

In FIG. 2 the upper graph g1 illustrates the axial movement of the distributor roller 7c (FIG. FIG. 1 ) with respect to the rotational phase angle φ of the forme cylinder 9.

As shown in the illustration, it is possible to adjustably change the axial stroke as well as the rotational phase position of the axial stroke movement of the ink fountain roller 7c.

In FIG. 3 is greatly simplified (and essentially only to illustrate a possible realization of the inventive concept), a drive system shown, via which the inking rollers 8 (see FIG. 1 ) upstream distributor rollers 7c, 7d can be driven. The Verreibungsantriebseinrichtung shown here comprises an eccentric structure 10, which as such can either sit directly on a journal of a printing cylinder, in particular the journal of the forme cylinder, or else via a transmission device, in particular a spur gear can be otherwise coupled to the machine drive.

On the eccentric 10 sits a crank rod 11 which is coupled with its, the eccentric 10 remote from the end with a rocker plate 12. The rocker plate 12 is pivotally mounted about a storage device not shown here in such a way that it can be pivoted in accordance with the force exerted by the eccentric lever 11 strokes about the pivot axis X. The rocker plate 12 is provided with an adjusting groove 13, in which a pivot pin 14 can be clamped in a positionally variable manner.

At the pivot pin 14, a first joint head 15 of a Verreiberstößelstange 16. The Verreibstößelstange 16 includes a second condyle 17, which sits on a pivot lever 18. In accordance with the pivot lever 18, a Verreiberwalzenfinger 19 is tilted about the pivot lever axis Y1. The Verreiberfinger 19 is connected via a roller 20 with a cam groove 21 of the distributor roller 7 d in engagement.

A kinematically similar gear train is also provided for driving the distributor roller 7c. This gear train also comprises a Verreiberstößelstange 22 which is coupled via a first joint head 23 and a second joint head 24 with the rocker plate 12 and the second pivot lever 25. About the second pivot lever 25 of this rigidly coupled Verreiberfinger 26 is actuated. The second driver finger 26 is engaged with the second driver roller 7c via a second roller 27. By the Verreibungsantriebseinrichtung shown here, it is possible by pivoting the rocker arm plate 12 to cause an axial oscillation of the distributor rollers 7c, 7d, this axial oscillation of the distributor rollers 7c, 7d adjustable in terms of both the phase position and in terms of the effective Axialhubes changeable.

The associated lifting movements are indicated by the arrow symbols incorporated in this drawing. Pivoting the rocker arm plate 12 in the direction indicated by the black arrowhead pivot direction leads to movements of the other components in the direction indicated by the black arrowheads of the associated arrows directions of movement. Pivoting the rocker plate 12 in the direction indicated by the white arrowhead pivot direction leads to movements of the components according to the direction of movement indicated by the white arrows.

In the embodiment shown here, the rocker plate 12 is provided in addition to the adjusting groove 13 with further threaded holes 28 .... 32, via which the rod ends 15, 23 of the two Verreibstößelstangen 16, 22 can be determined in certain fixed positions, as such certain standard operating conditions Take into account. The Verreiberstößelstangen 16, 22 are formed in this embodiment so that the length is adjustably changed to set the zero stroke position of the Verreiberwalzen.

It is possible, the connection structures for connecting the Verreiberstößelstangen 16, 22 to be executed on the rocker plate 12 so that both rod ends 15, 23 can be locked in the adjusting groove 13 position variable. Furthermore, it is also possible to form the rod ends 15, 23 in such a way that they overlap one another can be mounted (eg 23 to 15). It is also possible to provide several parking grooves.

As an alternative to the manually adjustable Verreibungsantriebseinrichtung shown here in particular for illustrating the inventive concept, it is also possible to form the Verreibungsantriebseinrichtung so that the adjustment of the Axialhubes the respective Verreiberwalze and the Hubphasenlage via actuators, which can be controlled from a central machine control.

On the basis of the solution concept according to the invention, a convertible trituration insert for different subject offset offsets can be realized. By adjusting the kinematics of the distributor rollers, it becomes possible to have a special influence on the color waste as well as any stenciling effects. The inking unit according to the invention is particularly suitable for offset rotary printing machines (sheet / roll) with conventional roller inking (wet or dry offset) according to known construction principles with intermediate rollers, ink drippers, applicator rollers for transferring the ink from the ink fountain (lifter or lifter) to the printing plate in highest print quality, in particular with regard to color drop or template tendency with respect to the different Drucksujets.

For this purpose, a plurality of ink rollers and application rollers and a Verreibseinsatzverstellung preferably present invention. In the case of the inking unit according to the invention, the displacement offset can be changed manually or, if appropriate, also automatically, preferably in a range between 0 ° and 180 ° (π / 2), but possibly also up to 360 ° (π).

The setting state of the inking unit can be determined and set on the basis of a variety of criteria, such as color drop or stenciling. The setting state can preferably be determined under the preceding evaluation of the printing data of the respective printing form.

The Verreibungsantrieb can be done with respect to phase angle and stroke via a gear train or via a single drive of the ink driver.

The upper color drivers are also adjustable in their phase relationship to each other and preferably also to the lower color driver (for example, in particular with regard to the phase angle of the reversal points and the stroke). It is possible to provide fixed offset angles for these upper color drivers.

The adjustment of the entire inking unit is preferably carried out on the basis of the printing data automatically or by control panel selection of the operator.

Due to the concept of the invention, a printing optimization with respect to different Sujets- and customer requirements is possible. On the basis of the concept according to the invention, a particularly high-quality inking unit can be created, in which special features of the respective printed matter can be particularly taken into account by the filigree setting possibilities of the kinematics of the transfer rollers. It is possible to make the adjustment of the Verreibungsantriebs invention automatically based on the pre-available technical printing data, so that thereby no extension of the setup times of the machine occurs.

The color drivers 7c and 7d (close to the inking rollers 8) have a particular influence on the print quality. The ink drivers 7c, 7d are variably adjustable in terms of stroke and phase position and thus are in variierbarer different phase position with the inking rollers 8 in contact. If there is an offset angle of 0 ° between the axial stroke movement of the two ink drivers 7c, 7d (maximum trimming at the same point), then the template inclination is low, but the color drop may be greater than at an offset angle. This can be advantageous in many print jobs. In this setting, during the operation of the printing press, the effect of the trimming insert adjustment on the printing result can be determined, whereby, in the course of the continued printing operation, an optimization with respect to the subject is made possible by laying the trimming insert point (motor or manual).

If the offset offset is chosen to be significantly greater than 0, e.g. Delta φ = about 180 °, the color drop over the arc circumference is significantly lower than at an offset of 0 °, at the same time, however, the template inclination is higher and the adjustable trimming insert is less effective, if this is adjusted. The applicator rollers can be set fixed or iridescent (even partially).

In this case, the ink drivers 7c, 7d (possibly also the third 7b or fourth 7a) are either mechanically fixed via a gear train or individually controlled drivers are provided, which are rotationally driven in phase relation to the plate cylinder (channel or channelless), e.g. through the machine control.

The printing form is known by corresponding data in its form (subject), or corresponding data are entered or set in the work preparation station or at the control station of the machine itself.

In the simplest embodiment, a manual switching operation between the rubbers 7a, 7b made, offset conversion 0 ° → 180 ° → 0 °, depending on the printing optimization or existing printing form.

The trimming insert becomes clearly effective in the 0 ° offset position and can be selected sujet optimized. The data from the pre-press allow pre-selection and setting of the trimming insert point.

Deposited computational algorithms (control station, work preparation stations) allow adjustment of the machine with respect to offset offset angle, trimming insert point, offset stroke, automatically with respect to the subject print or printing data, or by scanned print pattern or measured print pattern on the measurement table (eg XY table) and their Optimization in the pressing process and quality assurance process in the production.

In this regard, one or more dampers to the phase position of the plate cylinder (DA or channel) can be controlled. In this case, the dampening drive can be driven by the machine or individually controlled.

The dampening driver can also be controlled differently (angle-dependent) with regard to its circumferential speed (channel / pressure surface) in order to influence the occurrence of any channel strips.

In realizing the driver drive means using a rocker plate, it is possible to select the attachment point of the ram to the rocker plate so that a dead center of the lever system formed as such by the ram push rod and the rocker plate is traversed as the rocker plate oscillates. This results in a smaller Hubamplitude doubling the stroke frequency of the corresponding Verreiberwalze. Such a setting is suitable for driving the in FIG. 1 illustrated Verreiberwalze 7c.

LIST OF REFERENCE NUMBERS

1

paintbox

2

ink fountain roller

3

color Heber

4

Aufstreichwalze

5

rider roll

6

Transfer roll

7a

ink distributor

7b

ink distributor

7c

ink distributor

7d

ink distributor

8th

applicator roll

9

form cylinder

10

eccentric structure

11

Cam

12

rocker plate

13

adjusting groove

14

first pivot pin

15

first condyle

16

Verreiberstößelstange

17

joint head

18

pivoting lever

19

Verreiberfinger

20

caster

21

drive slot

22

Verreiberstößelstange

23

joint head

24

joint head

25

pivoting lever

26

Verreiberfinger

27

caster

28 - 32

fixing points

Claims (13)

1. An inking couple for an offset printing press having:

   - a plurality of form rollers (8), which are set against a form cylinder (9),

   - a first and a second distributor roller (7c, 7d) each arranged with respect to the ink flow in front of the form rollers (8),

   - further ink rollers (6, 5, 4, 3, 2) arranged in the ink flow in front of the distributor rollers, which as such serve for accomplishing the ink feed from an ink charging region, and

   - a distributor driving device for accomplishing the axial movement of the distributor rollers (7c, 7d)
   wherein the first and the second distributor rollers (7c, 7d) are arranged directly in front of the form rollers (8),
   characterized in that
   the distributor driving device is formed in such a manner that the phase position of the lifting movement of the first distributor roller (7c) can be adjustably varied with respect to the lifting movement of the second distributor roller (7d).
2. The inking couple according to Claim 1,
   characterized in that
   the phase position is continuously variable.
3. The inking couple according to Claim 1 or 2,
   characterized in that
   the phase position is variable adjustable in an angle region of at least n/2.
4. The inking couple according to at least one of the Claims 1 to 3,
   characterized in that
   the position of the reversing points is adjustable.
5. The inking couple according to at least one of the Claims 1 to 3,
   characterized in that
   the distributor stroke is adjustably variable.
6. The inking couple according to any one of the Claims 1 to 5,
   characterized in that
   the drive of the distributor rollers (7c, 7d) is affected via a common gear train.
7. The inking couple according to any one of the Claims 1 to 6,
   characterized in that
   for each distributor roller (7c, 7d) an independent drive train is provided.
8. The inking couple according to at least one of the Claims 1 to 7,
   characterized in that
   a dampening unit is arranged in front of the inking coupling and in that the phase position of the axial stroke movement of one or a plurality of damp distributor rollers of the dampening unit is adjustably variable with respect to the axial lifting movement of one of the distributor rollers of the inking couple.
9. A method for determining a state of adjustment of an inking couple for an offset printing press having a plurality of form rollers (8), which are set against a form cylinder (9), a first and a second distributor roller (7c, 7d) in each case arranged in the ink flow directly in front of the form rollers (8), a distributor driving device,
   characterized in that
   with respect to the ink distributor of the image on a printing block that is decisive for the respective inking couple, indicative data are evaluated by means of a processing procedure and/or an inline printing control unit, and on the inking couple adjustments as specified according to the evaluation results are carried out, wherein the process in procedure is configured such that within its scope and adjusting state for the distributor driving device is determined and
   that a phase offset that appears to be most suitable with respect to the ink distributor between the lifting movements of at least two distributor rollers is determined.
10. The method according to Claim 9,
    characterized in that
    a roller stroke that appears to be most suitable with respect to the ink distributor is determined for the respective distributor roller.
11. The method according to any one of the Claims 9 to 10,
    characterized in that
    determining the adjustment of the distributor drive takes place subject to selectable priority of the low wear of the distributor rollers.
12. The method according to any one of the Claims 9 to 11,
    characterized in that
    the adjustment of the distributor drive takes place subject to the use of adjusting drives which can be activated from the control system.
13. The method according to any one of the Claims 9 to 12,
    characterized in that
    both the adjustment of the distributor drive, as well as the adjusting values of the adjustable, axial changing of the ink form rollers are printing-job-specifically storable and repeatedly accessible.

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