WO2009059692A2

WO2009059692A2 - Positioning drive arrangement of a printing machine

Info

Publication number: WO2009059692A2
Application number: PCT/EP2008/008905
Authority: WO
Inventors: Jürgen Schölzig
Original assignee: Manroland Ag
Priority date: 2007-11-09
Filing date: 2008-10-22
Publication date: 2009-05-14
Also published as: WO2009059692A3; DE102007053596A1

Abstract

The invention relates to a positioning drive arrangement of a printing machine, comprising a positioning drive and a printing machine component that is to be positioned or a printing machine assembly that is to be positioned. According to the invention, the positioning drive is embodied as a micropositioning drive or nanopositioning drive (5).

Description

Positionierantriebsanordnung a printing press

The invention relates to a positioning drive arrangement of a printing press, with a positioning drive and a printing press component to be positioned or a printing press assembly to be positioned.

For the implementation of positioning tasks, various positioning drive arrangements are used in printing press technology. These usually have a drive unit and a transmission in order to position a printing press component or make certain positioning settings within a printing press assembly. As a transmission, for example, spindle nut systems, eccentric, crank mechanisms, gear or worm gear are used. The known Positionierantriebsanordnungen have a mechanical components corresponding positioning accuracy, which are to be kept at relatively large travel ranges only with great effort in the micrometer range.

The invention has for its object to increase the reproducible positioning accuracy and to create a uniform positioning for a variety of applications in the printing press.

To achieve this object, it is provided that the positioning drive is designed as a micro or nanopositioning drive. These are to be understood as positioning devices which are highly accurate, namely have accuracies of less than one nanometer (0.001 μm). However, the travel paths of such positioning devices are relatively small. Since micro- and nanopositioning drives are basically known, the peculiarity of the invention is to use such devices for positioning tasks in a printing press. So far, such solutions have not been used in this technical field because they are developed for the field of semiconductor manufacturing, biotechnology and microscopy were. Now transfering them to the new technical field overcomes this practice.

Piezo linear motors, for example, are based on an ultrasonic drive. This consists of a piezoceramic plate, in which a high-frequency resonant self-oscillation is excited. A frictional nose attached to the plate is displaced in a linear movement of the same frequency. Through contact with a friction rail, it drives the moving part of the mechanism. Each cycle produces a very small step of a few nanometers in length. As a result, in the sum of a continuous movement of virtually unlimited length and positioning accuracy, ie generated with a very large adjustment range. The

Thrust is generated from the energy of the longitudinal vibration. The transverse vibration is used for lifting and pressing the contact points to the friction rail. The energy of this vibration determines the maximum frictional force and thus the holding and pushing force of the drive. In such a drive so there is no gear or spindles or other mechanical components that could cause play or hysteresis.

According to a development of the invention, it is provided that the micro or noposition drive is designed as such a piezo linear drive. Pulse lengths of 10 μsec with step sizes are available for the positioning movement due to high-frequency oscillating piezoceramics, enabling resolutions of at least 0.1 μm. Holding forces of up to 500 N can be achieved with very small drives.

In particular, it is provided that the micro or nanopositioning drive has a self-locking ultrasonic motor. The self-locking ultrasonic motors act directly without intermediate elements, such as spindles or gears, and are free of backlash. The drive consists of a stator, which contains a piezoceramic oscillator. Furthermore, a runner designated as a friction rail is provided which is fastened directly to a movable slide. Furthermore, it is very advantageous if the micro or nanopositioning drive has a linear motor with at least one digital controller. Such digital controllers have a particularly low-noise control electronics and therefore allow highest resolutions.

In particular, it can be provided that the micro or nano-positioning drive is a hybrid positioning drive. These offer repeat accuracy of about 30 nm at high resolution and in particular straight-line motion at high speed. It has a very precise mechanical linear adjuster with DC motor and integrated piezo system as well as a common control.

The printing machine component to be positioned may preferably be a slider of a color metering. If there is a zonal ink dosage, then correspondingly many slides are provided, to each of which an inventive positioning drive is assigned. The device according to the invention may further operate a positioning printing machine assembly. This may preferably be a color / lacquer and / or dampening agent metering and / or the positioning of the printing material in the machine.

It is also preferably possible with the positioning drive according to the invention to position a printing machine component to be positioned, a cover mark, a front mark or a cylinder or a printing plate via a register.

The invention further relates to the use of a positioning drive arrangement according to the above statements on dyeing, coating and / or dampening agent metering on printing machines, in particular rotary printing machines. The use of the positioning drive arrangement can also be used for cover mark setting, front mark setting and / or register setting in printing presses. Such a position drive can also be achieved via a lateral pull mark or a feed drum (pre-gripper) positioning a sheet to be printed.

Due to the highly accurate positioning drive arrangement according to the invention can be carried out when used in a Farbdosiersystem the printing machine, in particular rotary printing machine, a highly accurate color metering, especially color slider adjustment. The respectively to be positioned ink slide works with a Farbduktor on a color box together, the slider position is adjusted zonal depending on the subject over the format width.

Additionally or alternatively, a dynamic color control or color control sujet related (in format length of the sheet and the sheet width) during the rotation of the ink fountain and the inking unit, especially in a shortened inking, possible because the positioning drive according to the invention not only highly accurate, but also works very fast with high repeat accuracy. Smallest dosing steps are possible, preferably up to 0.008 μm.

By means of the positioning arrangement according to the invention, in particular linear movements can be realized, but it is also possible to perform transverse movements for this purpose. In particular, piezo elements are present for these movements. Due to transverse movements, in particular a release movement of printing machine components, for example metering elements, can be generated so that their mobility is maintained. Also can be effected with such transverse movements by means of the positioning drive according to the invention trituration effects. Due to their accuracy, speed and reproducibility, the positioning drive arrangements according to the invention are suitable for achieving optimum printing results in a printing press, in particular a rotary printing press.

The invention will be explained in more detail with reference to drawings. Herein show:

FIG. 1 shows a zonal inking unit of a printing press in a perspective, schematic illustration and

Figure 2 is a schematic representation of a printing unit with applications of the invention.

1 shows an inking unit 1 of a printing press, not shown. The inking unit 1 has an ink reservoir (ink fountain), not shown, filled with ink, as well as a plurality of color slides 2 arranged next to one another, which are arranged zonally over the longitudinal extension of a ink ductor 3. The ink slides 2 are displaced in the direction of the double arrows 4 by means of nanopositioning drives 5 according to the invention substantially radially to the ink fountain 3, so that a gap distance between the respective ink slide 2 and the ink fountain roller 3 can be adjusted within the individual ink zones 6. In this case, a zonal color profile 7 with a corresponding ink layer thickness 8 sets on the ink fountain roller 3, which shows a corresponding profiling on the circumference of the ink ductor in the case of a dynamic positioning taking place during the rotation of the ink ductor. At the same time, an arbitrary layer thickness profile can be set across the width of the ink ductor. The corresponding color strip width 9 is constant. In FIG. 1, a 3D profile in the sheet travel direction 11 is shown by the reference numeral 10 by way of example for a zone.

The individual nanopositioning drives 5 are designed as piezo linear drives. They are each realized as a linear actuator with piezoelectric actuator and allow adjustment paths with nanometer resolution. In this way, a highly accurate color profile with high dynamics can be set. The Farbdosiersystem can act according to the principle of the linear slide or as a color meter (continuous or transverse to the knife edge) or as moved by an eccentric color slider and be moved with the described positional drive. _f For a dampening unit, the same mode of action can be displayed. A dampening ductor, which may, for example, be chromium-coated or ceramic-coated and thus provided with a water-friendly surface, is in operative connection with a positioning drive of the type described, and it can have a water film (profile) both continuously in the circumferential direction or discontinuously in the circumferential direction via slide profiles metered, for example, in the cylinder channel no dampening solution or minimum dampening solution film over the plate subject. Thus, the different fountain solution per Zylihderumdrehung the plate cylinder can be adjusted as needed of the printing plate. Printing interference is thus minimized, it takes the necessary dampening dosing both on the format width, as well as on (the format extent) the format length.

FIG. 2 schematically shows a printing unit of a sheetfed offset printing press. Starting from a sheet leading impression cylinder 20, this further has a blanket cylinder 22 and a plate or plate cylinder 23. The direction of rotation and thus the transport direction of the printing material are marked with a directional arrow 21.

On the surface of the plate cylinder 23, a clamping channel 24 is provided for attaching printing plates. For this purpose, in the clamping channel 24 substantially two clamping rails not shown here for the two ends of a pressure plate to be fastened on the surface of the plate cylinder 23 are arranged. The slide rails can be multi-part and are arranged for process-oriented positioning of the pressure plate relative to the surface of the plate cylinder 23 adjustable.

Furthermore, the plate cylinder 23 can be positioned both in the circumferential direction and in the axial direction relative to the adjacent blanket cylinder 22 or the counterpressure cylinder 20. This positioning serves to align the partial images in a multi-color printing press to one another. The partial images can by means of a corresponding register drive in the longitudinal and in the width direction of printing substrate sheet to each other to make cover. In today's high quality standards a very accurate positioning is required here.

Finally, the plate cylinder 23 and the blanket cylinder 22 and the blanket cylinder and the impression cylinder 20 are adjustable relative to each other. When rolling causes the so-called Besistellung the cylinder to each other, the transfer of the ink from the printing plate on the plate cylinder 23 on the blanket on the blanket cylinder 22 and the blanket on the printing material on the impression cylinder 20th Thus, the color transmission at the corresponding contact points evenly and safely, and thus with high quality, can be done, an exact adjustment of the position of each cooperating cylinder surfaces to each other is absolutely necessary.

Furthermore, the printing unit associated with the plate cylinder 23 has a dampening unit 25. The dampening unit 25 is formed from a plurality of dampening rollers 26, which are usually formed as a dampening roller on the plate cylinder 23, as a fountain roller or dampening roller in a dampening solution and as a metering of the dip roller assigned. The rollers are adjustable relative to one another in order to be able to influence the respective effective gaps for controlling the dampening solution supply to the printing plate on the plate cylinder 23.

Furthermore, the printing unit on one of a plurality of rollers existing inking unit 27, which is also associated with the plate cylinder. In particular, the inking unit includes an ink fountain 28 as a color reservoir and a Farbduk- gate roller 29, which cooperates with the ink fountain 28. In the ink fountain 28 Farbdosiereinrichtungen not shown here are arranged, which serve by adjustment relative to the ink fountain roller 29 of the regulation of the ink supply to the inking unit 27. The ink metering devices can be designed, for example, as slide elements as shown in connection with FIG. The supplied ink is guided in the inking unit 27 via the inking rollers through a plurality of cleavage points and thus to a low ink layer thickness. rolls. The ink is finally fed via inking rollers 30 of the printing plate on the plate cylinder 23.

For the function of inking unit 27 and dampening unit 25 is a very precise adjustment of the rollers to each other and the metering devices to the rollers required. These adjustments are fast, accurate and, above all, reproducible even during printing.

Furthermore, the metering devices for the color dosing of great variety. It is known to perform ink metering as a continuous or slotted ink knife whose metering edge is adjustable relative to the ink fountain roller by bending the ink blade.

Furthermore, it is known to carry out the paint metering as a slide. These can be guided rectilinearly for positioning their metering edge relative to the ink ductor or designed as a tiltable doctor blade.

Finally, the Farbdosierelemente can also be designed as Dosierezzenter. In this case, the dosing eccentric is supported by support rings on the ink fountain roller, whereby when the dosing eccentric rotates, its eccentric surface releases a changing dosing gap with respect to the ink ductor.

Finally, elements for guiding or transporting the printing material sheets to be printed are provided in the printing unit. For this purpose, the impression cylinder 20 is assigned a feed drum 35. To the feed drum 35, the printing material are transferred from a pre-gripper 31. The pre-gripper 31 takes over the printing material sheets from an installation table 32 on which the printing material sheets usually arrive as a sheet flow lying below, these being separated and conveyed by a sheet feeder, not shown here. For process-oriented sheet feeding 31 so-called front marks 33 are arranged in combination with deck marks for aligning the printing material at the front edge of the feed table. Furthermore, so-called page marks 34 are arranged on the feed table 31 for aligning the printing material at its side edge. Again, very sensitive and nachzuführende during printing settings are required. This applies in particular to the front marks 33, cover marks and side marks 34. Likewise, adjustments to the pregripper 31 may be necessary.

This results in a variety of Einstellnotutigkeiten small travel and a need for high positioning accuracy in such a trained printing unit.

The adjustment of the metering devices and the rollers on the inking unit 27 relates to the exact and process-oriented ink supply. This is done in the range of ink layer thicknesses of a few microns thickness. Since mechanical gears often have play in the range of 0.01 to 0.1 mm, the effect on this process part is particularly great. Therefore, the use of nanopositionierantrieben is particularly advantageous here. Particularly in the case of the ink dosing elements, the small design of the nanopositioning drives is advantageous, since in a paint dosing device, a large number of individual dosing elements are to be driven side by side in a small space.

On a large scale, the use of nanopositioning drives in the adjustment of rolling elements is possible. Here, the provision of inking rollers and dampening rollers among themselves come into question. Furthermore, the settings of the dyeing and dampening rollers with respect to the plate cylinder come into consideration. Finally, the supplies of cylinders to each other come into consideration. Here impression cylinder and rubber cylinder must be positioned to each other. Furthermore, plate cylinder and blanket cylinder must be positioned to each other. In this case, it is often worked with contact arranged on the cylinders so-called bearer rings. The bearer rings serve as spacers of the cylinder. Your contact pressure or contact pressure must be set precisely. Werterhin can find the application of the nanopositioning on the plate cylinder 23 for positioning the slide rails for the printing plates application. Orienting the plates in multicolor multi-color presses is extremely important because the sub-images to be printed by the plates must be exactly aligned on the substrate sheet. A sensitive and especially reproducible adjustment is absolutely necessary.

Also on the plate cylinder 23, the setting of the so-called register is required. This affects in the same way as the positioning of the pressure plate on the plate cylinder 23. In this case, however, the entire cylinder is adjusted relative to the cylinders adjacent to it.

Finally, the use of nanopositioning drives is also advantageous in the area of sheet alignment on the feed table 32. For small travel ranges, a high positioning accuracy for the setting of front marks 33 to produce an exact position of the leading edge of the printing material sheet. This setting can be made dependent on measuring devices that can detect the position of the leading edge of the incoming substrate sheet and represent misplacements. Furthermore, the settings can be made in dependence on measurements of the so-called passport in the printing press. The small size of the nanopositioning drives is also particularly advantageous for the adjustment of the front marks 33 and the cover marks, since the installation space in the area of the sheet metal installation is severely limited.

Furthermore, the cover brands must be sensitively adjusted to the arch thickness. Since printing material sheets of the smallest thickness can be processed in a few tenths of a mm to mm thick cardboard, a very adaptable positioning is also required here. The side marks 34 are also to be positioned and, if appropriate, be repositioned similarly to the front marks 33 as a function of measured values relative to the respective current lateral position of the printing material sheets.

All these settings can be performed well and safely by means of the nanopositioning drives. In particular, the backlash-free, exact and executable with high repeat accuracy setting is beneficial. Furthermore, in all cases, the small size of Nanonpositionierantriebe advantage advantage. Finally, the comparatively low drive energy required for the individual drives is advantageous in simplifying the necessary cabling in the machine.

The combination of the nanopositioning drives with a corresponding controller is to be regarded as particularly advantageous. Thus, the process-oriented control of the positioning movements can take place locally at the respective setting location. Thus, the central control of the printing machine is relieved of a variety of arithmetic operations and setting commands.

LIST OF REFERENCE NUMBERS

1 inking unit

2 color slides

3 ink ductor

4 double-headed arrow

5 nanopositioning drive

6 color zone

7 color profile

8 color layer thickness

9 color stripe width

10 3D profile

11 sheet travel direction

20 impression cylinders

21 direction of rotation

22 rubber cylinder

23 plate cylinder

24 clamping channel

25 dampening unit

26 dampening rollers

27 inking unit

28 color box

29 ink ductor

30 inking rollers

31 pre-grippers

32 investment table

33 leading brands

34 page marks

35 feed drum

Claims

claims

1. Positionierantriebsanordnung a printing press, with a positioning drive and to be positioned printing machine component or a po sitioning printing press assembly, characterized in that the positioning drive is designed as a micro or nano-positioning drive (5).

2. Positionierantriebsanordnung according to claim 1, characterized in that the micro or nano-positioning drive (5) is designed as a piezo linear drive.

3. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that the micro or nano-positioning drive (5) has a self-locking ultrasonic motor.

4. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that the micro or nano-positioning drive (5) comprises a linear motor with at least one digital controller.

5. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that the micro or nano-positioning drive (5) is a hybrid positioning drive.

6. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that the printing press assembly to be positioned a Farbdosiersystem or a dampening solution dosing system.

7. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that the printing machine component to be positioned a color slider or a

Dosing eccentric or a color meter or a metering blade of a Farbdosier- device is.

8. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that the printing machine assembly to be positioned is a paint and / or dampening agent metering.

9. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that the printing machine assembly to be positioned is an anilox roller of a lacquer and / or dye and / or dampening agent metering.

10. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that. in that the printing machine component to be positioned is a cover mark, a side drawing mark, a front mark and / or a pregripper device.

11. Positionierantriebsanordnung according to any one of the preceding claims, characterized in that the printing machine component to be positioned is a clamping rail in a plate cylinder for a plate positioning and / or a plate cylinder of a printing unit for register positioning.

12. Use of a positioning drive arrangement according to one or more of the preceding claims for dye, lacquer and / or dampening agent metering on printing presses, in particular special rotary printing machines.

13. Use of a Positionierantriebsanordnung according to one or more of the preceding claims for Deckmarkeneinstellung, front-set and / or front-mark adjustment in printing presses.

14. Use of a positioning drive arrangement according to one or more of the preceding claims for adjusting the position of the printing plate on a plate cylinder and / or for register setting in printing presses.

15. Use of a Positionierantriebsanordnung according to one or more of the preceding claims for positioning of Beistellungen or pressures between two or more cylinders, in particular a Schmitzringkontaktes, preferably between rubber and plate cylinder.

16. Use of a Positionierantriebsanordnung according to one or more of the preceding claims for positioning of Beistellungen or pressings of two or more pressure rollers, in particular ink transfer / inking rollers.