ES2693290T3 - Rotary printer - Google Patents

Abstract

Rotary printer (1) for printing a printing medium (BS), which has: at least one printing body (10) with a printing mold cylinder (11) to carry a printing mold arrangement to reproduce at least less a printing arrangement on the printing medium (BS) and to reproduce at least two registration marks (RM), which are in disposition relationship with the at least one printing arrangement, on the printing medium (BS) ) adjacent to two opposing print support limiting edges (BS) in an axial direction of the printing mold cylinder (11), at least one detection device (30) which is ready to detect registration marks (RM) ) on the printing medium (BS) automatically with a scanning frequency of one time per rotation of the printing mold cylinder (11) and generate a detection signal for each detected registration mark (RM), the detection positive (30) further prepared to detect, with a higher scanning frequency compared to the scanning frequency of the registration marks (RM), a current machine acceleration of the rotary printer (1), a control (40), which is connected to the detection device (30), which is prepared to determine a circumferential registration failure of the printing arrangement on the recording medium (BS) by comparing the detection signals for the registration marks (RM), which is prepared to determine, based on the current machine acceleration, a current machine speed of the rotary printer (1), and that is prepared to determine, based on the failure of circumferential record, a compensation value for the compensation of circumferential registration failure taking into consideration the current machine speed and make it available as adjusting signal, and an adjustment device (50) which is connected to the control device (40) and which is prepared to perform automatically on the basis of the adjustment signal, by means of at least one actuator (51, 52), an inclination between the impression mold cylinder (11) and the printing support (BS), referred to the axial direction of the printing mold cylinder (11), to compensate for the circumferential registration failure.

Description

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Rotary printer

DESCRIPTION

The invention relates to a rotary printer with at least one printing body, particularly a rotary roller printer.

A printing body of a rotary printer for printing a printing medium, such as a printing support web, usually has a printing mold cylinder to carry a printing mold arrangement to reproduce at least one printing arrangement on the support of printing and reproducing at least two registration marks, which are in relation to arrangement with the printing arrangement, on the printing support adjacent to two opposite edges of the printing medium opposite in an axial direction of the mold cylinder. Print. The arrangement of printing molds can be formed in this case by a number of printing plates housed on the impression mold cylinder. The usual rotary printers, such as rotary presses for polychrome printing, usually have several printing bodies for successively printing the printing medium.

In the printing with conventional printing plates, on the printing support width (eg, bandwidth) in the axial direction of the impression mold cylinder, different register faults can occur on the circumference. The registration failures can occur, on the one hand, due to faults in the production of plates or the fixation of the plates on the print mold cylinder and are, therefore, of a static nature. The registration failures can result essentially from oblique positions when exposing and folding the plates, by mechanical play and inaccuracies in the placement of plates or by the plate holding device itself. In these cases you can start from an oblique position or also from a turn of the printing plate in question. On the other hand, in the case of registration failures dynamic effects may also come into play which may be due to differences in the web tension of a print support band and thus be dependent on a machine speed, as well as the Characteristics of the print support material itself.

To compensate for registration failures of this type, such as those mentioned above, adjustments of a diagonal register and / or an oblique registration of the rotary printer may be used. The control of oblique positions of the printing arrangement is currently performed by the machine operator itself, the machine operator visually comparing the circumferential records to each other in the case of the fence of the limiting edges of the printing medium. If the machine operator visually detects deviations, respectively circumferential registration faults, it performs, in order to compensate, an adjustment of the diagonal register in the corresponding printing body and / or an adjustment of a roller in front of the first printing body. .

However, due to the trend towards increasingly wide rotary printers, it is increasingly difficult for a machine operator, p. eg, due to a number of possible band guiding, correctly assigning registration faults in the print medium and initiating the corresponding correction measures. Also, p. For example, in the case of adjustments of the diagonal register it is difficult to carry out a correct correction. Apart from this, the birds may be due to a large extent to the printing support used and the band tension conditions, and, therefore, be subject to fluctuations. As a result, it can increase effort for a machine operator and can worsen print quality and roll stability.

From WO 2005/023690 A1, WO 2004/048092 A2, US 6 199 480 B1 and DE 198 30, 490 A1 rotary printers are known according to the state of the art.

Thus, WO 2005/023690 A1 discloses a rotary printer for printing a printing medium, which has at least one printing body with a printing mold cylinder to carry a printing mold arrangement to reproduce at least a printing arrangement on the printing support and for reproducing at least two registration marks, which are in relation to arrangement with the at least one printing arrangement, on the printing support adjacent to two limiting edges of the printing support. Opposite impressions in an axial direction of the impression mold cylinder. This rotary printer has at least one detection device. The detection device is ready to detect the registration marks on the printing medium and generate a detection signal for each detection mark detected. This rotary printer also has a control device that is connected to the detection device. The control device is prepared to determine a circumferential registration failure. This rotary printer also has an adjustment device that is connected to the control device. The adjustment device is prepared to perform automatically on the basis of an adjustment signal, by means of at least one actuator, an inclination between the impression mold cylinder and the printing support, referred to the axial direction of the mold cylinder. impression, to compensate for circumferential registration failure.

The invention is based on the objective of providing a rotary printer which, with the help of a machine operator, enables improved print quality and print stability.

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This is achieved with a rotary printer according to claim 1. Further developments of the invention are defined in the dependent claims.

According to the invention, a rotary printer is provided for printing a printing medium, particularly a rotary roller printer for printing a printing medium as a printing medium. The rotary printer has at least one printing body, at least one detection device, a control device and an adjustment device.

The at least one printing body comprises a printing mold cylinder for carrying a printing mold arrangement to reproduce at least one printing arrangement on the printing support and for reproducing at least two registration marks, which are in arrangement relation with the at least one printing arrangement on the printing support adjacent to two opposite edges of the printing substrate opposite in an axial direction of the impression mold cylinder.

The detection device is prepared to detect the registration marks on the printing medium automatically with a frequency of scanning once per rotation of the impression mold cylinder and to generate a detection signal for each detection mark detected.

The detection device is also prepared to detect, with a scan frequency higher compared to the frequency of scanning of the registration marks, a current machine acceleration of the rotary printer.

The control device is connected to the detection device. The control device is ready to determine a circumferential registration failure of the printing arrangement on the printing medium by comparing the detection signals for the registration marks. The control device is also prepared to determine, on the basis of the current machine acceleration, a current machine speed of the rotary press. The control device is also prepared to determine, on the basis of the circumferential registration failure, a compensation value for the compensation of the circumferential registration failure taking into consideration the current machine speed and making it available as an adjustment signal.

The adjusting device is connected to the control device and prepared to perform automatically on the basis of the adjustment signal, by means of at least one automatically controllable actuator, a slope between the impression mold cylinder and the printing support referred to the axial direction of the impression mold cylinder, to compensate for circumferential registration failure.

By means of the automatic detection of the registration marks, which, p. eg, they can be formed as color registration marks, and the automatic compensation of a possible circumferential registration failure, that is, by means of observation and modulation, respectively compensation of permanent automatic registration fluctuations, can be achieved with the rotary printer according to the invention, with relief from a machine operator, improved print quality and print stability.

By determining the current machine speed of the rotary printer and considering it in the compensation of circumferential registration failure, the accuracy of the circumferential registration failure compensation can be increased and the print quality and spin stability.

According to one embodiment of the invention, the at least one printing body has a transfer cylinder for interacting with the impression mold cylinder and the printing support for transferring the at least one printing device to the printing support. The impression mold cylinder has at two longitudinal opposite ends in its axial direction in each case a journal, a journal resting on an oscillating bearing, so that the impression mold cylinder is rotatable in the oscillating bearing along the length of the impression mold. a sense of impression with respect to the transfer cylinder. An actuator, which is automatically controllable, of the adjusting device for rotating the impression mold cylinder at an oscillation angle, which corresponds to the adjustment signal, is arranged on the other end to compensate for the circumferential registration failure. By means of such a rotation of the impression mold cylinder, it is tilted with respect to the printing support, so that the circumferential registration failure is automatically compensated.

According to another embodiment of the invention, the rotary printer also has a roller for printing support that in a direction of printing support passage of the rotary printer is disposed in front of the at least one printing body to guide the support of printing before entry to at least one printing body. The printing support roller has two opposing longitudinal ends in an axial direction of that in each case a web, a web resting on an oscillating bearing, so that the printing support roller is rotatable in the web. oscillating bearing with respect to the printing support. An actuator, which is automatically controllable, of the adjustment device for rotating the printing support roller at an angle of oscillation, corresponding to the signal, is arranged on the other end.

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adjustment, to compensate for circumferential registration failure. By means of such a rotation of the printing support roller, the tension of the printing support is modified on one side and thus the printing support is inclined with respect to the impression mold cylinder, so that the Circumferential registration failure is automatically compensated. Preferably, the at least one printing body in this case forms a first printing location of the rotary printer.

According to another embodiment of the invention, each actuator of the adjustment device has a predetermined total adjustment path, each actuator of the adjustment device being in a zero position, which corresponds to a circumferential registration failure-free state, placed in a Average position of the total adjustment path. In this way, bidirectional registration deviations can also be advantageously compensated for.

According to another form of manufacture of the invention, the rotary printer has several printing bodies, which are shaped like the at least one printing body, to successively print the printing support. The control device is prepared to determine dead times, which are due to a transport of the printing support between the printing bodies, for a detection of the registration marks on the printing support and also to take them into consideration in the compensation of the failure. of circumferential registration. In this way, the accuracy of the circumferential registration failure compensation can be increased and the printing quality and the print stability can be further increased.

According to another form of manufacture of the invention, the impression-mold cylinders of the printing units each have a predefined cylinder circumference, the control device being prepared to determine the dead times on the basis of multiples of the cylinder circumferences . With the multiples of the cylinder circumferences a simple hypothesis can be assumed for dead times between printing bodies.

In the following, the invention is described in more detail on the basis of a preferred manufacturing form and with reference to the attached figures.

Figure 1 Figure 2 Figure 3

Figure 4 Figure 5 Figure 6

shows a view for explaining an oblique position of the printing plate on the printing mold cylinder of a printing body.

shows a coordinate system, which is used in the manufacturing form of the invention, of a simulation model.

shows a view illustrating the rotation of a considered transverse position of a printing plate according to the simulation model according to the manufacturing form of the invention.

shows a schematic view of a printing mold cylinder and its rotation according to the simulation model according to the preferred manufacturing form of the invention.

shows a schematic view of a printing support roller and its rotation according to the simulation model according to the preferred embodiment of the invention.

shows a schematic perspective view of a printing body of the rotary printer according to the manufacturing form of the invention.

In the following, reference will be made, with reference to FIGS. 1 to 6, to a rotary printer 1 according to a manufacturing method of the invention for printing a printing medium BS (see, eg, FIG. 6). The rotary printer 1 according to the present form of manufacture of the invention is shaped in particular as a rotary roller printer for printing a printing support web, such as a paper web as a printing medium BS.

As shown in Figure 6, the rotary printer 1 has at least one printing body 10 and a control device 40. Despite not being represented in the figures, the rotary printer 1 presents in the present form of manufacture of the invention various printing units 10 formed as the at least one printing body 10 which are disposed one behind the other for the printing in polychrome successively of the printing support BS in a direction of printing support passage LR of the rotary printer 1 .

Each printing body 10 comprises a printing mold cylinder 11 for carrying a printing mold arrangement (not separately named) for reproducing at least one printing arrangement on the printing medium BS and for reproducing various registration marks RM, which they are in disposition relation with the at least one printing arrangement, on the printing support BS adjacent to two constraining edges of the printing support BS opposite in an axial direction of the impression mold cylinder 11, as shown in FIG. Figure 6. The RM registration marks are formed, for example, as color registration marks. In the present form of manufacture of the invention, the printing mold arrangement is formed in particular with a number of printing plates housed on the impression mold cylinder 11.

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Each printing body 10 also has a transfer cylinder 12 for interacting with the impression mold cylinder 11 and the printing support BS, for transferring the at least one printing device to the printing medium BS, and a printing cylinder 13. to interact with the transfer cylinder 12. Each printing body has a drive side Sl and a drive side Sll.

Each printing body 10 is provided with an optical detection device 30 which is prepared to automatically detect the RM registration marks on the printing support BS and generate a detection signal for each detection mark RM detected.

The detection of the RM registration marks can take place due to the fact that the print carrier Width of page in broadsheet format BS is detected on its width by means of at least one detection device 30 traversing approximately perpendicularly to the printing support travel direction LR and / or by at least one arrangement of at least one detection device 30, which simultaneously detects the width of the print medium Width of page in broadsheet format BS.

As already mentioned previously, in printing on polychrome printing plates can occur, on the width of printing support (bandwidth in the direction from the handling side Sl to the drive side Sll) in the axial direction of the cylinder of impression mold 11, different registration flaws in the circumference. The circumferential registration faults can occur, on the one hand, due to faults in the production of plates or the fixing of the printing plates on the printing mold cylinder 11 and are, therefore, of a static nature. The circumferential registration failures can result essentially from oblique positions when exposing and folding the printing plates, by mechanical play and inaccuracies in the placement of plates or by the plate holding device itself. In these cases you can start from an oblique position or also from a turn of the printing plates in question. On the other hand, in the case of circumferential registration faults, dynamic effects may also come into play, which may be due to differences in the web tension of the BS printing medium and thus depend on a machine speed, as well as on the characteristics of the BS printing medium itself.

In order to be able to determine and adequately compensate for those circumferential registration faults, the control device 40 is connected to each of the detection devices 30 and ready to determine a circumferential registration failure of the printing arrangement on the printing medium BS by means of of comparing the detection signals for the registration marks RM of a respective printing body 10 and determining, on the basis of the circumferential registration failure, a compensation value for the compensation of the circumferential registration failure and making it available as Adjustment signal.

Furthermore, as shown in FIG. 6, the rotary printer 1 comprises, for the purpose of circumferential registration fault compensation, an adjustment device 50 which is connected to the control device 40 and which is prepared to perform automatically on the basis of the adjustment signal, by means of actuators 51, 52, which are automatically controllable, (see figure 4 and figure 5) of the adjustment device 50, an inclination between the impression mold cylinder 11 and the printing support BS, referred to to the axial direction of the impression mold cylinder 11 of the respective printing body 10, to compensate for the circumferential registration failure.

The functions of the control device 50 may be implemented by hardware, firmware and / or software and are explained in detail below.

As a function for the determination and compensation of circumferential log failures, a simulation model that describes the previously mentioned magnitudes of influence and their effects is implemented in the control device 50. The simulation model is composed of two partial models, namely a disturbance model for the simulation of the oblique plate position, respectively of the "oblique impression", and a compensation model for the elimination of disturbance quantities by means of of inclination of the printing arrangement. For the ink i (color separation) considered in each case, the rotation of the printing arrangement results from the superposition of the two partial models:

image 1

In this case, the angle pzi represents an oblique position of the printing arrangement, as shown in Fig. 1, and the angle cpui represents a tilt of the impression mold cylinder 11 with respect to the printing support BS or an inclination of the BS printing support itself.

For parameterization and simulation of the model, a coordinate system is established as shown in figure 2. The coordinates in the x direction are oriented in this case with the machine medium in the axial direction of the impression mold cylinder 11, and the coordinates in direction and are oriented with a puncture (beginning of reason). The positive rotation angles are defined in the opposite direction of the clockwise and the turning angles

Negatives are in the clockwise direction. Since the directions of action of the actuators 51, 52 of the adjusting device 50 can be differentiated between different types of machine, a corresponding configuration of the respective direction of rotation is provided.

5 First, the perturbation magnitude model is described in detail. According to the perturbation magnitude model, it can be calculated, as shown in FIG. 3, starting from the previous general considerations, for each transversal position P on an observed longitudinal position of a printing plate, by means of rotation at the angle 9z, a resulting position P 'on the printing support BS as follows:

image2

10

The resulting deviations transverse to the direction of impression and in the direction of impression (direction of passage of support of impression LR) turn out to be:

Ax - x cos <pz - x Ay = x ■ sin <pz

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Since the disturbances (angle of rotation) that occur in practice are very small, the following simplifications can be made:

lim cus <p = 1

or

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lim. sin m S <p

(p- * 0

From this it becomes evident that a lateral correction of the observed point is not necessary (Ax "0). For correction in circumferential direction, therefore:

Ay * x (p7)

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For the moment, for the simulation, the disturbance represented is not pronounced as a function of the process, but essentially it should be considered as "due to production". Observed circumferential deviations dependent on time should be recalculated, therefore, only in the case of modifications of 30 parameters of the simulation that have already been established at the time of the exploration. The calculation of the deviations is carried out for the observation points j of all the color separations involved.

The following table 1 lists possible simulation parameters for the calculation of disturbance magnitudes:

 Parameter

 Type Range of values Unit Observation

 9zi

 Disturbance -1,0 ... 1,0 [mrad] Disruption of the modifiable online process of color separation i

 xj

 Job specification -1500 ... 1500 [mm] Transverse position of the observation point j on the print control strip

35 Table 1

Now the compensation model will be described in detail. For the compensation of the previously described disturbance, the impression mold cylinder 11 is inclined with respect to the printing support BS. For this purpose, as shown in FIG. 4, the impression mold cylinder 11 is supported on one side in a rotating manner on an oscillating bearing 11.1, and on the other side it is positioned in the printing direction by an actuator 51 (p. eg an adjusting motor) which can be controlled automatically by the adjusting device 50.

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More precisely, the impression mold cylinder 11 has at two longitudinal opposite ends in its axial direction in each case a munon, a munon being supported on the oscillating bearing 11.1, so that the printing mold cylinder 11 is rotatable in the oscillating bearing 11.1 along the direction of impression with respect to the transfer cylinder 12. On the other side is the actuator 51, which is automatically controllable, of the adjustment device 50 for rotating the impression mold cylinder 11 in the oscillation angle 9u, which corresponds to the adjustment signal of the control device 40, to compensate for the circumferential registration failure.

The positions x or of the pivot point, as well as Xa of the actuator 51 are known in this case as installation parameters. In analogous form to the previous considerations and simplifications, a rotation, respectively an effective turn, turns out to be:

image3

-*or

The resulting circumferential correction in a transverse position x observed on the printing plate thus becomes:

image4

Another possibility for compensating the disturbance described previously is to tilt the printing medium BS, which is formed as a printing support web, before the considered printing location. Preferably, this method is used in rotary roller printers before the first printing place of a printing support web. In this case, the web is intervened by means of a printing support roll roller rotatably supported on one side and the band tension on one side is "artificially modified".

More precisely, as shown in FIG. 5, the rotary printer 1 has a print carrier roller 20, which in the direction of the printing support passage LR of the rotary printer 1 is arranged in front of the printing body 10. considered, for guiding the printing support Bs before the entrance to the printing body 10. The printing support roller 20 has two opposite longitudinal ends in an axial direction of the one in each case a circle, with a base resting on it. an oscillating bearing 20.1, so that the printing support roller 20 is rotatable in the oscillating bearing 20.1 with respect to the printing support BS. On the other side there is arranged an actuator 52 (such as, for example, an adjusting motor), which is automatically controllable, of the adjusting device 50 for rotating the impression mold cylinder 20 at the oscillation angle 9u, which corresponds to the adjustment signal of the control device 40, to compensate for the circumferential registration failure. Preferably, the printing body 10 considered in this case forms a first printing location of the rotary printer 1.

The angle of rotation, respectively oscillation angle, 9u effective is obtained analogously to the inclination of the impression mold cylinder 11 previously described. Since a model does not currently exist for the generated modification of the web tension, the resulting circumferential correction is calculated in simplified form as follows:

image5

In this case, kp represents a parameterizable material characteristic of the printing medium.

If for the actuators 51, 52 of the adjustment device 50 mentioned above are used, e.g. For example, servomotors with gears, their behavior is purely integral in nature. The current preset position ur is known, as well as the adjustment speed of the actuator 51, 52. For a selected scanning time Ta, an actuator position turns out to be, therefore, for a current scanning step:

u (0 = w ((j) + ja ■ satt% * [ka (ur (i) - u (ti))]

with

to,

bt

x>

x> a x <b sonst

In this case, the amplification ka is preferably set to 1 / ta.

For the respective scanning step, the longitudinal positions of the individual separations i of the defined observation points j (color registration marks) are corrected due to the current process parameters.

The following Table 2 lists possible simulation parameters for the compensation model:

 Parameter

 Type Range Unit values Observation

 x0

 of installation -1500. . 1500 [mm] Transversal position of rotating impression mold cylinder support for color separation i

 for

 of installation -1500. . 1500 [mm] Transverse position of the actuator for color separation i

 goes

 of installation 0.01 ... 1.0 [mm / s] Actuator adjustment speed

 ur

 Process specification 0 ... [mm] Default position of the actuator

 kp

 Process specification or cn cn Characteristic of print media, default value 1.0

 xj

 Job specification -1500. . 1500 [mm] Transversal position of the observation point j on the printing control strip

10 Table 2

The behavior observation is based on the detection of printed RM register marks that are in particular color registration marks. The process behavior is therefore detected, preferably only once per rotation of the impression mold cylinder. For the simulation it is necessary, therefore, also only 15 one exploration per turn. With constant upz impression mold cylinder circumference and variable machine speed, this leads to different ta scanning times:

TytCO =

Upz

vM (t)

20 In order to be able to reproduce also realistically changing machine speeds, it is therefore preferred to calculate with high scanning frequency tA << Ta the current machine speed:

image6

25 The aM parameter represents in this case a current machine acceleration.

In other words, each detection device 30 which is ready to detect the registration marks RM on the printing support BS with a scanning frequency of one time per rotation of the impression mold cylinder 11, and is ready to detect, with a higher scanning frequency as compared to the scanning frequency of the RM registration marks, a current aM machine acceleration of the rotary printer 1.

The control device 40 is ready to determine, on the basis of the acceleration of the current aM machine, a current machine speed vm of the rotary press 1.

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The following Table 3 lists possible simulation parameters for the speed and time of exploration.

 Parameter

 Type Range of values Unit Observation

 Upz

 of installation 500 ... 1500 [mm] Circumference of impression mold cylinder

 A.M

 Process specification 0.1 ... 1 [m / s2] Acceleration

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 vMr

 Process specification 5 .. 20 [m / s] Default speed setting

 ta

 of installation 10 .. 50 [ms] Time of exploration

Table 3

For the detection of circumferential log failures, observation should preferably be made with high frequency. Therefore, the downtimes resulting from transporting the printed BS printing medium to the detection site (detection device 30) should not be neglected. Since the distances of the printing bodies 10 from each other, as well as to the respective detection location, are constant, the transport delays can be reproduced as dead paths. For simplicity, they are assumed as multiple distances from the predefined impression mold cylinder circumference. The dead paths of the printing units 10, respectively individual printing places are preferably implemented as displacement registers which, for each revolution of the impression mold cylinder TA (t), are displaced in a cell in each case. For the individual printing places, the magnitudes n of the registers turn out to be:

nt - l + kM - Dr kb

In this case, kM is the distance of the detection from the first printing place, ko the distance between the printing places and Say the succession index of printing [0 ... i] of the corresponding printing place.

In other words, the control device 40 is prepared to determine dead times, which are due to a transport of the printing medium BS between the printing bodies 10, for a detection of the registration marks RM on the printing medium BS and also have them in consideration in the compensation of circumferential registration failure. Particularly, the control device 40 is prepared to determine the dead times on the basis of multiples of the predefined cylinder circumferences (PZU) of the impression mold cylinders 11 of the printing bodies 10.

The following table 4 lists possible simulation parameters for transport times.

 Parameter

 Type Range Unit values Observation

 kM

 of installation 5. . 150 [PZU] Distance from the first printing place to the detection location

 kD

 of installation 1. . 5 [PZU] Distance of the places of impression

 Gave

 of installation 0. . 6 Succession of impression

Table 4

The purpose of the following is to indicate possibilities for considering factors due to construction. In practice, the mounting positions of the actuators 51, 52, as well as the oscillating bearings 11.1, 20.1 of the impression mold cylinders 11 and the impression support roller 20, as well as the operating mode on the support of impression BS can be different for different types of machine. To adapt the simulation for different cases that are presented under real conditions the following facts may be important.

With regard to the position of the actuators 51, 52, for the simulation, the position on the printing support BS is decisive, in which the effect of a change of position of the actuator can be observed. This depends on the constructive implementation in the printing body 10, in particular it does not need to necessarily coincide with the mounting position of the actuator 51, 52. The installation parameter Xa (Table 2) can therefore be interpreted practically as «active position» Xw on the printing support. For practice, the following relationship can be assumed:

image7

With this, the circumferential correction dependent on the observation position x turns out to be:

image8

UX

The direction of action of the actuators 51, 52 also depends on the constructive implementation and may be different according to the model and the running direction of the rotary printer 1. However, it does not need to coincide

with the coordinate system chosen for the simulation. In order to avoid irritations, it is necessary, therefore, that actuators 51, 52 predefine their senses of action (signs) as installation parameters. If constructive differences of the printing places (printing units 10) are to be expected between themselves, a sign for all of the actuators 51, 52 of the same type is sufficient in principle.

5

Concerning the real correction of circumferential registration failures, the following may be important. The two partial models are superimposed on the simulation model, to simulate the visible circumferential deviation on the printing support BS. In order to be able to compensate for disturbance quantities (disturbances of the angle of rotation of the printing arrangement) both in the negative and positive directions, an effective position of the actuators 10 51, 52 can be established in the middle position of a respective total adjustment path of the actuator. those:

V / = u -

two

J / m Ay = 0

Ucff-> 0

In other words, each actuator 51, 52 of the adjusting device 50 has a predetermined total adjustment path and is set to a zero position, which corresponds to a circumferential registration failure-free state, in a mid-travel position. Total adjustment to be able to compensate for disturbance quantities (disturbances of the angle of rotation of the printing arrangement) both in the negative and positive directions.

Accordingly, the control device 40 is advantageously prepared in such a way that each position of each actuator 51, 52 is optimized during the operating state such that it in each case has a large possible distance to a respective limitation. of actuator, such as, for example, a final position or a stop. Therefore, maximum adjustment runs and maximum compensations can be made.

Finally, it remains to be mentioned that with the existing configuration of the rotary printer 1, influences of the lateral and circumferential registration can also be simulated. For this, the relationships described above generally apply in accordance with the sense, particularly with regard to the coordinate system used, as well as the direction of action due to the construction, and the effective action of the simulated actuators. Since the simulation represents in principle an extension of the existing simulation for the stretch of impression support, they can be summarized, for each observation point j defined from the color separation i, the individual corrections considered as follows:

image9

35 List of reference characters

40

I Rotary printer

10 Printing body

II Impression mold cylinder

11.1 Oscillating bearing

12 Transfer cylinder

13 Printing cylinder

20 Roller grna print support

20.1 Oscillating bearing

30 Detection device

40 Control device

50 Adjustment device

51 Actuator

52 Actuator

BS Printing support

LR Sense of passage of impression support

5 RM Registration mark

Sliding side

SII Drive side

Claims (9)

one. 10 fifteen twenty 25 30 two. 35 40 3. Four. Five fifty 4. 55 5. 60 Rotary printer (1) to print a printing medium (BS), which has: at least one printing body (10) with a printing mold cylinder (11) for carrying a printing mold arrangement for reproducing at least one printing arrangement on the printing medium (BS) and for reproducing at least two registration marks (RM), which are in relation to arrangement with the at least one printing arrangement, on the printing support (BS) adjacent to two opposing edges of the print support (BS) opposite in an axial direction of the impression mold cylinder (11), at least one detection device (30) that is ready to detect the registration marks (RM) on the printing medium (BS) automatically with a frequency of exploration of one time per rotation of the impression mold cylinder (11) and generating a detection signal for each detection mark (RM) detected, the detection device (30) being also prepared to detect, with a higher scanning frequency compared to the frequency of scanning of the registration marks (RM) ), an acceleration of the current machine of the rotary printer (1), a control device (40), which is connected to the detection device (30), which is arranged to determine a circumferential registration failure of the printing arrangement on the printing medium (BS) by means of comparison of the signals of detection for the registration marks (RM), which is prepared to determine, based on the current machine acceleration, a current machine speed of the rotary printer (1), and that is ready to determine, based on the circumferential registration failure, a compensation value for the compensation of the circumferential registration failure taking into consideration the current machine speed and making it available as an adjustment signal, and an adjustment device (50) which is connected to the control device (40) and which is prepared to perform automatically on the basis of the adjustment signal, by means of at least one actuator (51, 52), an inclination between the cylinder of impression mold (11) and printing support (BS), referred to the axial direction of the impression mold cylinder (11), to compensate for circumferential registration failure. Rotary printer (1) according to claim 1, the at least one printing body (10) having a transfer cylinder (12) for interacting with the impression mold cylinder (11) and the printing support (BS) for transferring the at least one printing arrangement for the printing medium (BS), the impression-mold cylinder (11) having two opposite longitudinal ends in its axial direction in each case a world, a base resting on an oscillating bearing ( 11.1), so that the printing mold cylinder (11) is rotatable in the oscillating bearing (11.1) along one direction of impression with respect to the transfer cylinder (12), and being disposed on the other world a actuator (51) of the adjusting device (50) for rotating the impression mold cylinder (11) at an oscillation angle, which corresponds to the adjustment signal, to compensate for the circumferential registration failure. Rotary printer (1) according to claims 1 or 2, furthermore with a roller of printing support (20), which in a direction of print support passage (LR) of the rotary printer (1) is disposed in front of the at least one printing body (10) for guiding the printing support (BS) before entry to the at least one printing body (10), the printing support roller (20) having two longitudinal ends opposed in an axial direction of that in each case a munon, a munon being supported on an oscillating bearing (20.1), so that the impression carrier roller (20) is rotatable in the oscillating bearing (20.1) with respect to to the printing support (BS), and an actuator (52) of the adjustment device (50) for rotating the printing support roller (20) at an oscillation angle, which corresponds to the adjustment signal, to compensate for circumferential registration failure. Rotary printer (1) according to claim 3, the at least one printing body (10) forming a first printing place of the rotating printer (1). Rotary printer (1) according to one of claims 1 to 4, each actuator (51, 52) of the adjustment device (50) having a predetermined total adjustment path, and each actuator (51, 52) of the adjustment device ( 50) in a zero position, which corresponds to a circumferential register failure-free state, placed in a middle position of the total adjustment path. Rotary printer (1) according to one of claims 1 to 5, each position of each actuator (51, 52) being optimized, while it is in the operational state, such that it presents in each case a distance as much as possible large to a respective actuator limitation. 7. Rotary printer (1) according to one of claims 1 to 6, the registration marks (RM) being formed as color registration marks. 8 5 10 9 fifteen 10 twenty Rotary printer (1) according to one of claims 1 to 7, the rotary printer (1) having several printing bodies (10), which are shaped like the at least one printing body (10), to print the support in succession of printing (BS), and the control device (40) being prepared to determine dead times, which are due to a transport of the printing medium (BS) between the printing bodies (10), for a detection of the registration marks (Rm) on the printing support (BS) and also have them in consideration in the compensation of circumferential registration failure. Rotary printer (1) according to claim 8, the printing mold cylinders (11) of the printing bodies (10) having in each case a predefined cylinder circumference, and the control device (40) being arranged to determine the times dead on the basis of multiple cylinder circumferences. Rotary printer (1) according to one of claims 1 to 9, the printing medium (BS) being detectable on its width by means of at least one detection device (30) running approximately perpendicular to the direction of travel of printing support (LR) and / or by at least one arrangement of at least one detection device (30), which simultaneously detects the width of the printing medium (BS).