WO2017207590A1

WO2017207590A1 - Rotary printing press

Info

Publication number: WO2017207590A1
Application number: PCT/EP2017/063070
Authority: WO
Inventors: Martin Krümpelmann; Frank Gunschera; Markus BAUSCHULTE; Ulrich Harte
Original assignee: Windmöller & Hölscher Kg
Priority date: 2016-05-30
Filing date: 2017-05-30
Publication date: 2017-12-07
Also published as: EP3251845A1; ES2760268T3; EP3251845B1

Abstract

The invention relates to a rotary printing press (101) for printing on a material web (115), comprising a central cylinder (102) and a plurality of inking units (103-108), which are arranged around the central cylinder (102) and in each of which printing ink can be transferred onto the material web (115) by means of a printing drum (111). In order to increase the economic efficiency of a rotary printing press (101) for printing on packaging, the machine-side anchorings (114) of at least one printing drum (111) are designed in such a way that the printing drum (111) can be removed and the space occupied by the printing drum (111) can be released, and the released space can be fitted with an inkjet printing unit (201).

Description

Rotary press

The invention relates to a rotary printing machine for printing a

Material web with a Zentraizylinder and several arranged around the Zentraizylinder around inking units, in each of which ink is transferable from a pressure roller on the web.

The so-called central cylinder design is especially at

Flexographic printing machines used. As far as the flexographic printing machine is also used for packaging printing, the material web is usually a plastic film. Different country markings, country-specific trademark protection, or similar minor changes to a package may result in a large print job having to be broken down into several smaller print jobs, even though the overall packaging design itself remains unchanged. As the printing length decreases, however, the profitability of the flexographic printing press decreases.

The object of the invention is therefore to increase the efficiency of a flexographic printing press for packaging printing.

To solve this problem, the machine-side anchorages of at least one pressure roller are configured such that the pressure roller can be removed and the space enclosed by the pressure roller can be released and the released space can be equipped with an inkjet printing unit.

The resulting process according to the invention is a process for

Printing a web with a rotary printing machine, wherein the Rotary printing machine has a Zentraizylinder and a plurality of arranged around the Zentraizylinder around inking units, in each of which ink is transferred from a pressure roller on the web, wherein a pressure roller is released from the machine side anchors and removed from the rotary printing press, so that the area covered by the pressure roller space is free , And wherein the vacated space is equipped with an inkjet printing unit.

On the removable pressure roller so are not only the usual supply units for the ink, drying, etc. (at a

Flexographic printing machine so in particular the anilox roller and the doctoring chamber), but it is also an inkjet supply unit provided at the same time, which includes an inkjet ink reservoir and which is connectable to the populated inkjet printing unit. In the same way, an inkjet control unit is provided, which is connectable to the populated inkjet printing unit.

In general, the inkjet printing unit will have a smaller printing width than the removed printing roller. According to a preferred embodiment, therefore, a linear guide is provided, so that the inkjet printing unit is displaceable transversely to the material web.

According to a further preferred embodiment is for removing the

Pressure roller and equipped to equip the inkjet printing unit an industrial robot. Further details and advantages of the invention will be described with reference to the accompanying drawings. In these show:

Fig. 1 is a first schematic side view of the invention

flexo

Fig. 2 is a second schematic side view of the invention

flexo

3 is a plan view of the in the flexographic printing machine of FIG .. 2

built-in inkjet printing unit according to a first embodiment, 4 is a plan view of the in the flexographic printing machine of FIG .. 2

built-in inkjet printing unit according to a second embodiment, and

5 shows the view A, designated in FIGS. 1 and 2, with an industrial robot mounted on a gantry.

Fig. 1 shows a first schematic side view of the invention

Flexographic printing. The flexographic printing machine 101 is a so-called

Central cylinder engine and accordingly has a central cylinder 102 around which the eight inking units 103, 104, 105, 106, 107, 108, 109 and 1 10 are arranged in a star shape. Each of these inking units has a pressure roller 1 1 1, a

Anilox roller 1 12 and a blade chamber 1 13, each at the

Machine-side anchorages 1 14 are mounted. The components 1 1 1, 1 12, 1 13 and 1 14 are designated by way of example of the inking unit 108 and are found in a corresponding manner also on the other inking units.

In order to print the material web 1 15, this is deducted in the unwinding station 1 16 of the roll of material 1 17 and over several guide rollers to the

Pressure roller 1 18 out. The pressure roller 1 18 applies the material web 1 15 for further transport to the central cylinder 102, so that the material web 1 15 register to the inking units and not shown

Passed between the inking unit driers.

After the web 1 15 has left the central cylinder 102, this is led to the drying of the ink by a bridge dryer 1 19 and then wound in the winding station 120 on the roll of material 121.

The central cylinder engine 101 is preferably used for packaging printing, wherein the material web 1 15 is then usually a plastic film. Different country markings, country-specific trademark protection, or similar minor changes to a package may result in having to split a large print job into multiple print jobs, even though the overall packaging design itself remains unchanged. To be flexible on such minor changes during a print job To be able to react, the machine-side anchors of the pressure roller of at least one inking unit are designed such that the pressure roller removed and the space enclosed by the pressure roller space can be released. This refinement of the central cylinder engine 101 is explained in greater detail in FIG. 2 on the basis of the inking unit 108.

Fig. 2 shows a second schematic side view of the invention

Flexographic printing. Compared with Fig. 1 are the same parts with the same

Reference numerals provided so that reference can be made to the above description of FIG. 1. A decisive difference with respect to the first schematic view according to FIG. 1 in the second schematic view according to FIG. 2 is that the pressure roller 11 has been removed from the inking unit 108 and an inkjet printing unit 201 has been installed in the space previously occupied by the pressure roller ,

FIG. 3 shows a plan view of the inkjet printing unit 201 installed in the flexographic printing machine according to FIG. 2, according to the view B, designated in FIG. 2, according to a first exemplary embodiment. The individual components of the inkjet printing unit 201 are mounted on the two side parts 301 and 302, the distance of which corresponds approximately to the maximum printing width of the pressure roller 1 1 1 built according to FIG. This means that the printing width of the printing head 303 of the inkjet printing unit 201 is less than the maximum printing width of the printing rollers available for flexographic printing. However, as explained above, with the inkjet printing unit 201, only minor changes in the global design of the packaging print are to be printed, the smaller print width of the print head 303 (for example 40 cm) is sufficient for this purpose. However, the print head 303 must then be displaceable transversely to the web of material 15 in order to be able to achieve any desired position of the web to be printed for a specific print job.

For this purpose, the print head 303 is mounted on a carriage 304, which is displaceable on a first linear guide 305 transversely to the material web. To fix the remaining degree of freedom, the carriage 304 also supports over the arm 306 on a second linear guide 307, wherein the arm 306 is displaceable on the second linear guide 307 transverse to the material web.

In principle, it is conceivable that the carriage 304 is manually moved to the desired printing position before each print job and then fixed with clamping devices. In the variant shown in FIG. 3, however, the carriage 304 can be automatically moved and locked on the linear guides 305 and 307. For this purpose, a toothed belt 308 is provided, which is braced between the Umlenkzahnrad 309 and the electric motor 310 driven gear 31 1.

FIG. 4 shows a top view of the inkjet printing unit 201 installed in the flexographic printing press according to FIG. 2, in accordance with the view B, designated in FIG. 2, according to a second exemplary embodiment. In contrast to the exemplary embodiment according to FIG. 3, the inkjet printing unit 201 according to this embodiment can print over the entire printing width in the so-called single-pass mode. The individual components of the inkjet printing unit 201 are mounted on the two side parts 401 and 402, which are held by the transverse struts 409 and 410 and whose distance from one another corresponds approximately to the maximum printing width of the pressure roller 1 1 1 built according to FIG. Also in this case, therefore, the printing width of a single printhead (for example, 40 cm) is less than the maximum printing width of the printing rollers available for flexographic printing. So that the inkjet printing unit 201 can nevertheless print over the entire printing width, a plurality of inkjet printing heads 403, 404, 405, 406, 407 and 408 are mounted offset between the side parts 401 and 402 as shown. By selectively controlling the individual inkjet printheads 403, 404, 405, 406, 407 and 408, any desired position of the material web to be printed can thus be printed in single-pass operation.

FIG. 5 shows the view A, designated in FIGS. 1 and 2, with an industrial robot 502 mounted on a portal 501. Compared to FIGS. 1 and 2, the same parts are provided with the same reference numerals, so that in this respect reference is made to the above description according to FIG 1 and 2 can be referenced. The industrial robot 502 is capable of removing the printing roller 1 1 1 of the inking unit 108 from the flexographic printing machine 101 and inserting the inkjet printing unit 201 in the released space, as indicated by the direction of movement 503 as shown in FIG. The

Connection of the terminals for the ink supply and the control electronics are then made manually by the operator after the insertion of the inkjet printing unit 201, but it is also conceivable that the production of these connections is also carried out by the industrial robot 502.

The pressure rollers used in flexographic printing usually consist of a shaft mounted in the machine frame and of a sleeve (i.e., sleeve) pushed onto the shaft on which the printing plate is mounted. Here are two basic variants:

For applications in which there are frequent job changes, single-ended mandrels have prevailed, on which the sleeves are pushed. In printing operation, the free ends are intercepted with interceptors, so that vibrations of the pressure rollers are avoided. Prior to changing the sleeves, the interceptors are removed from the domes of the ink transfer roller so that the sleeves can be pulled off the mandrel via the resulting free end. In this variant, the industrial robot is able to first deduct the sleeve from the mandrel and then the mandrel itself from the

Machine frame of the flexographic printing machine 101 refer.

In another variant, which is usually for very large print widths

(above about 1600 mm) and / or very high printing speeds (above about 300 m / min) is used, bilaterally mounted shafts are used with deferred sleeves. To change a sleeve, the waves are then completely removable.

The invention was based on a flexographic printing machine in the so-called

Central cylinder design explained. For completeness it should be mentioned that the invention of course in the same way for flexographic printing machines in

Series construction or even for gravure printing machines is applicable.

The explanations with reference to FIGS. 1 and 2 were made by way of example and without restriction of generality on the basis of the inking unit 108 The features and measures described there can also be applied to the other inking units. It is also possible to apply the described features and measures for several or even for all inking units.

Claims

claims

1 . Rotary printing machine for printing a material web, with a central cylinder and a plurality of arranged around the central cylinder inking units, in each of which ink from a pressure roller on the material web is transferable, wherein the machine-side anchorages at least one pressure roller are designed such that the pressure roller removed and the of the Pressure roller covered space can be released and the released space is equipped with an inkjet printing unit.

2. Rotary printing machine according to claim 1, with an inkjet supply unit, which comprises an inkjet ink reservoir and which is connectable to the populated inkjet printing unit.

3. Rotary printing machine according to one of claims 1 - 2, with an inkjet control unit, which is connectable to the populated inkjet printing unit.

4. Rotary printing machine according to one of claims 1 - 3, wherein the inkjet printing unit has a smaller printing width than the removed printing roller and is displaceable on a linear guide transversely to the material web.

5. Rotary printing machine according to one of claims 1 - 4, wherein the

Removing the pressure roller and for equipping the inkjet printing unit an industrial robot is provided.

6. Rotary printing machine according to one of claims 1-5, wherein the

Rotary printing machine is a flexographic printing machine.

7. A method for printing a material web with a

Rotary printing machine, wherein the rotary printing machine a

Central cylinder and several arranged around the central cylinder around Comprises inking, in each of which ink is transferred from a pressure roller to the web, wherein a pressure roller is released from the machine-side anchors and removed from the rotary printing press, so that the space covered by the pressure roller is free space, and wherein the vacated space with an inkjet Printing unit is equipped.

The method of claim 7, wherein the populated inkjet printing unit is connected to an inkjet supply unit comprising an inkjet ink reservoir.

9. The method according to any one of claims 7 - 8, wherein the populated inkjet printing unit is connected to an inkjet printing unit.

10. The method according to any one of claims 7 - 9, wherein the inkjet printing unit has a smaller printing width than the removed printing roller and is moved transversely to the material web on a linear guide.

1 1. Method according to one of claims 7 - 10, wherein for removing the

Pressure roller and for loading the inkjet printing unit an industrial robot is used. 12. The method according to any one of claims 7 - 1 1, wherein as

Rotary printing machine is a flexographic printing machine used.