DE102007053596A1 - Positionierantriebsanordnung a printing press - Google Patents

Abstract

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. It is envisaged that the positioning drive is designed as a micro or nanopositioning drive (5).

Description

The The invention relates to a positioning drive arrangement of a printing machine, 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 in printing press technology are diverse positioning drive arrangements used. These usually have a drive unit and a gearbox to position a printing press component or certain positioning settings within a printing press assembly make. For example, spindle-nut systems, eccentric, Crank gears, gear or worm gear for use. The well-known Positioning drive assemblies have a mechanical members corresponding positioning accuracy, with relatively large travel ranges can be kept only with great effort in the micrometer range.

Of the Invention is the object of the reproducible positioning accuracy to increase and a uniform positioning drive for a wide variety of applications to create in the printing press.

to solution This object is achieved that the positioning drive as a micro or Nanopositionierantrieb is trained. These are to be understood as positioning devices which are highly accurate, namely Have accuracies of less than one nanometer (0.001 μm). The travel paths however, such positioning devices are relatively small. There Micro- and nano-positioning drives are basically known exists the peculiarity of the invention therein, such devices for positioning tasks in a printing machine. So far in this technical Area such solutions not used as they are for the field of semiconductor manufacturing, biotechnology and microscopy were developed. Now she transfers to the new technical field overcomes this practice.

Piezo Linear Motors for example, based on an ultrasonic drive. This one exists from a piezoceramic plate, in which a high-frequency resonant Self-oscillation is stimulated. A friction nose attached to the plate is thereby placed in a linear movement of the same frequency. By the contact with a friction rail drives the moving part of the Mechanics on. Each cycle generates a very small step of a few nanometers in length. This adds up to a continuous movement of practicality unlimited length and positioning accuracy, ie with a very large adjustment range generated. The thrust force is thereby the energy of the longitudinal vibration generated. The transverse vibration becomes lifting and pressing used the contact points on the friction rail. The energy of this vibration determines the maximum frictional force and thus the holding and pushing force of the drive.

In So there is no gear or spindles in such a drive or other mechanical components causing play or hysteresis could.

To A development of the invention provides that the micro or nanopositioning as such a piezo linear actuator is trained. For the positioning movement by high-frequency oscillating piezoceramics stand pulse lengths of 10 μsec with increments available, the resolutions of at least 0.1 μm enable. With very small drives can this holding forces of up to 500 N can be achieved.

Especially is provided that the micro or nano-positioning drive a self-locking ultrasonic motor has. 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. Further, as a friction rail designated runner provided, which is attached directly to a movable carriage is.

Further It is very beneficial if the micro or nano positioning drive a linear motor having at least one digital controller. Such digital controllers have a particularly low-noise control electronics on and therefore allow highest Resolutions.

Especially can be provided that the micro or nano-positioning drive is a hybrid positioning drive. This offer at high resolution as well especially linear motion at high speed repeat accuracy of about 30 nm. It has a very precise mechanical linear adjuster with DC motor and integrated piezo system as well as a common control on.

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. It may preferably be a color / lacquer and / or dampening agent metering and / or is the positioning of the printing material in the machine.

Also it is preferably possible with the positioning drive according to the invention a printing machine component to be positioned, a cover mark, a Front or over a register to position a cylinder or a pressure plate.

The The invention further relates to the use of a positioning drive arrangement according to the above versions for color, lacquer and / or dampening agent metering on printing presses, in particular rotary printing machines. The use of the positioning drive arrangement can also be used for deckmark adjustment, front-mark adjustment and / or Register setting can be used on printing presses. Such a Positional drive can also over a lateral pull mark or feed drum (pre-gripper) positioning align a sheet to be printed.

by virtue of the highly accurate Positionierantriebsanordnung invention when used in a color metering system of the printing press, in particular rotary printing press, a high-precision color metering, especially color slider adjustment done. The respectively to be positioned Farbschieber works together with a Farbduktor on a color box, the slider position depending on the subject on the format width zonal is set.

Additionally or alternatively is also a dynamic color control or color control Subject-related (in format length of the bow and over the sheet width) during the rotation of the ink fountain roller and the inking unit, in particular at a shortened one Inking unit, possible, because the positioning drive arrangement according to the invention not only highly accurate, but also very fast with high repeat accuracy is working. Smallest dosing steps are possible, preferably up to 0.008 μm.

through the positioning arrangement according to the invention can be realized in particular linear movements, where it but also possible is to make this transverse movements. In particular, for these Movements Piezo elements available. Due to transverse movements, in particular a release movement be produced by printing machine components, for example metering elements, so that their mobility is maintained. Also, can be with such transverse movements by means of the positioning drive arrangement according to the invention Cause trituration effects. The positioning drive arrangements according to the invention are because of their accuracy, speed and reproducibility suitable, optimal printing results in a printing press, in particular Rotary printing machine to achieve.

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

Here in demonstrate:

1 a zonal inking unit of a printing machine in a perspective, schematic representation and

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

The 1 shows an inking unit 1 a printing press, not shown. The inking unit 1 has a not shown ink reservoir (ink fountain), filled with paint, and a plurality of juxtaposed color slides 2 , the zonal over the longitudinal extent of a Farbduktors 3 are arranged. The color slider 2 are in the direction of double arrows 4 by means of nanopositioning drives according to the invention 5 essentially radially to the ink ductor 3 displaceable, so that thereby within the individual ink zones 6 a gap distance between the respective color slider 2 and the ink ductor 3 can be adjusted. This turns on the color ductor 3 a zonal color profile 7 with corresponding color layer thickness 8th a, with a dynamic, during the rotation of the Farbduktors positioning, a corresponding profiling on the circumference of the Farbduktors shows. At the same time, an arbitrary layer thickness profile can be set across the width of the ink ductor. The corresponding color stripe width 9 is constant. In the 1 is with the reference numeral 10 Example of a zone a 3D profile in sheet travel direction 11 shown.

The individual nanopositioning drives 5 are designed as piezo linear actuators. 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 thereby according to the principle of the linear slide or also as a colorimeter (continuous or transverse to the knife edge slotted) or act as a moving from an eccentric color slider and be moved with the described position drive.

For a dampening unit, the same mode of action can be displayed. A dampening ductor, which may for example be chrome-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 About slide profiles a water film (profile) both in the circumferential direction continuously or in the circumferential direction discontinuously metered, for example, in the cylinder channel no dampening solution or minimal dampening solution film over the plate subject. Thus, the different fountain solution per cylinder revolution of 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.

In 2 is a printing unit of a sheetfed offset printing machine shown schematically. Starting from a sheet leading impression cylinder 20 this still has a rubber cylinder 22 and a plate or plate cylinder 23 on. The direction of rotation and thus the transport direction of the printing material are with a directional arrow 21 characterized.

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

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

Finally, the plate cylinder 23 and the rubber cylinder 22 as well as the blanket cylinder and the impression cylinder 20 adjustable relative to each other. When rolling the so-called ordering of the cylinder to each other causes the transfer of the ink from the printing plate on the plate cylinder 23 on the blanket on the blanket cylinder 22 and from the blanket to the substrate sheet on the impression cylinder 20 , Thus, the color transmission at the corresponding contact points uniformly 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 has the plate cylinder 23 assigned a dampening unit 25 on. The dampening unit 25 is made up of several dampening rollers 26 usually formed as a dampening roller on the plate cylinder 23 , Are designed as a dipping roller or dampening roller in a dampening solution container and as dosing of the dipping roller assigned. The rollers are adjustable relative to each other to the respective effective gaps for controlling the dampening solution supply to the pressure plate on the plate cylinder 23 to be able to influence.

Furthermore, the printing unit has an existing of a variety of rollers inking 27 on, which is also associated with the plate cylinder. The inking unit includes in particular a color box 28 as a color reservoir and a Farbduktorwalze 29 that with the color box 28 interacts. In the color box 28 are not shown in detail Farbdosiereinrichtungen arranged by adjustment with respect to the Farbduktor 29 the regulation of the ink supply to the inking unit 27 serve. The ink metering devices may, for example, as related to 1 may be formed as a slider elements. The supplied color is in the inking unit 27 passed over the inking rollers through a plurality of cleavage sites and thus rolled out to a small ink layer thickness. The color eventually becomes over inking rollers 30 the pressure plate on the plate cylinder 23 fed.

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.

Farther are the dosing for the Color dosage of large Diversity. It is known paint dosing as a continuous or Slotted color knife perform whose dosing edge opposite the Farbduktor is adjustable by bending the colorimeter.

Farther It is known to perform the paint metering as a slider. These can for positioning its dosing edge in relation to the ink ductor in a straight line guided or designed as a tiltable squeegee be.

Finally, the Color dosing be executed as a dosing eccentric. This supports the dosing eccentric over support rings on the ink ductor, wherein upon rotation of the Dosierexzenters whose eccentric surface a changing one Dosing gap opposite the ink ductor releases.

Finally, in the printing unit elements provided for guiding or transport of the printing material to be printed sheet. This is the impression cylinder 20 a feed drum 35 assigned. To the feed drum 35 are the printing material from a pre-gripper 31 to hand over. The pre-gripper 31 takes over the printing material for this purpose from a plant table 32 , on which the printing material sheets usually arrive as a submerged arc stream, these being separated and promoted by a sheet feeder, not shown here. For process-appropriate sheet feeding are at the feed table 31 so called front lays 33 arranged in combination with cover marks for aligning the printing material at the front edge. Furthermore, at the feed table 31 so-called page marks 34 arranged for alignment of the printing material on the side edge.

Again, very sensitive and nachzuführende during printing settings are required. This concerns in particular the leading brands 33 , Deckmarken and Seitenmarken 34 , Likewise, settings on the pre-gripper 31 to be required.

In order to results in a variety of Einstellnotwendigkeiten at small Stops and a need after high positioning accuracy in such a trained Printing unit.

The setting of the dosing devices and the rollers on the inking unit 27 concerns 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 nanopositioning drives is particularly advantageous here. Particularly in the case of the ink metering elements, the small design of the nanopositioning drives is advantageous, since in a paint metering device, a large number of individual metering elements are to be driven next to each other in a small space.

In great Scope is the use of nanopositioning drives in the setting possible from rolling elements. Here come the provision the inking rollers and dampening rollers among themselves in question. Furthermore, the settings of the inking and dampening rollers come across from the plate cylinder into consideration. Finally, the supplies come the cylinder into each other into consideration. Here have impression cylinder and Rubber cylinders are positioned to each other. Furthermore, plate cylinder must and rubber cylinders are positioned to each other. In this case becomes common with contact of arranged on the cylinders so-called bearer rings worked. The bearer rings serve as spacers of the cylinder. Your contact pressure or contact pressure must be set precisely.

Furthermore, the application of the nanopositioning drives on the plate cylinder 23 find the positioning of 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 is the setting of the so-called register required. This has the same effect as the positioning of the printing plate on the plate cylinder 23 , Here, however, the entire cylinder is adjusted relative to the cylinders adjacent to it.

Finally, the use of nanopositioning drives is also in the area of sheet alignment on the feed table 32 advantageous. With small travel ranges is a high positioning accuracy for the adjustment of front brands 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. Also for the adjustment of the front brands 33 and the cover brands, the small size of the nanopositioning drives is particularly advantageous because the space in the area of the sheet metal plant is severely limited.

Farther have to the cover brands on sensitive the arch thickness are adjusted. Since substrate sheet of the least Thickness to process in a few tenths mm to mm thick cardboard A very adaptable positioning is also required here.

The page marks 34 are also to be positioned and, where appropriate, similar to the front lays 33 be repositioned depending on measured values for the respective current lateral position of the printing material.

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 ver equally low drive energy required for the individual drives in simplifying the necessary wiring in the machine advantageous.

When Particularly advantageous is the combination of the nanopositioning drives to look at with a corresponding controller. So decentralized at the respective setting the process-oriented control of the positioning movements respectively. This is the central control of the printing press of relieved of a large number of arithmetic operations and positioning commands.

1

inking

2

ink slide

3

ink fountain roller

4

double arrow

5

Nanopositionierantrieb

6

color zone

7

color profile

8th

Ink layer thickness

9

Ink stripe width

10

3D profile

11

Sheet running direction

20

Impression cylinder

21

direction of rotation

22

rubber cylinder

23

plate cylinder

24

chip channel

25

dampening

26

Dampening rollers

27

inking

28

paintbox

29

ink fountain roller

30

Inking rollers

31

pregrippers

32

feed table

33

front lays

34

sidelays

35

feed drum

Claims (16)

Positionierantriebsanordnung a printing machine, with a positioning drive and a printing press component to be positioned or to be positioned printing machine assembly, characterized in that the positioning drive as a micro or nano-positioning drive ( 5 ) is trained. Positionierantriebsanordnung according to claim 1, characterized in that the micro or nano-positioning drive ( 5 ) is designed as a piezo linear drive. Positioning drive arrangement according to one of the preceding claims, characterized in that the micro or nano-positioning drive ( 5 ) has a self-locking ultrasonic motor. Positioning drive arrangement according to one of the preceding claims, characterized in that the micro or nano-positioning drive ( 5 ) has a linear motor with at least one digital controller. Positioning drive arrangement according to one of the preceding claims, characterized in that the micro or nano-positioning drive ( 5 ) is a hybrid positioning drive. Positioning drive arrangement according to one of the preceding Claims, characterized in that the printing machine assembly to be positioned a paint dosing system or a dampening dosing system. Positioning drive arrangement according to one of the preceding Claims, characterized in that the printing machine component to be positioned a paint slider or a dosing eccentric or a color meter or a metering blade of a Farbdosiereinrichtung is. Positioning drive arrangement according to one of the preceding Claims, characterized in that the printing machine assembly to be positioned a paint and / or dampening agent dosage is. Positioning drive arrangement according to one of the preceding Claims, characterized in that the printing machine assembly to be positioned an anilox roller of a paint and / or colorant and / or dampening agent metering is. Positioning drive arrangement according to one of the preceding Claims, characterized in that the printing machine component to be positioned a deck mark, a side marker, a front mark and / or a pre-gripper device is. Positioning drive arrangement according to one of the preceding Claims, characterized in that the printing machine component to be positioned a tensioning rail in a plate cylinder for a plate positioning and / or a plate cylinder of a printing unit for register positioning is. Use of a positioning drive arrangement according to one or more of the preceding claims for color, lacquer and / or Moisture dosing on printing presses, in particular special rotary printing presses. Use of a positioning drive system tion according to one or more of the preceding claims for cover mark adjustment, front-mark adjustment and / or front-mark adjustment in printing presses. Use of a positioning drive arrangement according to one or more of the preceding claims for adjusting the situation the printing plate on a plate cylinder and / or register setting at printing presses. Use of a positioning drive arrangement according to one or more of the preceding claims for the positioning of Provisions or pressure between two or more cylinders, especially a bearer ring contact, preferably between rubber and plate cylinder. Use of a positioning drive arrangement according to one or more of the preceding claims for the positioning of Provisions or pressing of two or more pressure rollers, in particular ink transfer / inking rollers.