EP1593513B1 - Printer with at least two color sheets each carrying print substance - Google Patents

Printer with at least two color sheets each carrying print substance Download PDF

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Publication number
EP1593513B1
EP1593513B1 EP05101653A EP05101653A EP1593513B1 EP 1593513 B1 EP1593513 B1 EP 1593513B1 EP 05101653 A EP05101653 A EP 05101653A EP 05101653 A EP05101653 A EP 05101653A EP 1593513 B1 EP1593513 B1 EP 1593513B1
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EP
European Patent Office
Prior art keywords
printing
printer according
ink
control device
color
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05101653A
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German (de)
French (fr)
Other versions
EP1593513A2 (en
EP1593513A3 (en
Inventor
Harald Jeschonneck
Jürgen Stiel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koenig and Bauer AG
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Koenig and Bauer AG
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Publication date
Application filed by Koenig and Bauer AG filed Critical Koenig and Bauer AG
Publication of EP1593513A2 publication Critical patent/EP1593513A2/en
Publication of EP1593513A3 publication Critical patent/EP1593513A3/en
Application granted granted Critical
Publication of EP1593513B1 publication Critical patent/EP1593513B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/44Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
    • B41J2/442Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/21Ink jet for multi-colour printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/47Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
    • B41J2/471Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/485Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/515Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements line printer type

Definitions

  • the invention relates to a printing press with at least two color carriers, each carrying a printing substance, according to the preamble of claim 1.
  • a printing method which is capable of a printing substance by means of a preferably pulsed and focused energy beam, for. B. a laser beam or electron beam to print.
  • the energy of the energy beam is entered either directly or after a conversion in an absorption layer indirectly in the printing substance, wherein the printing substance z. B. from in a solvent, for. B. dissolved in water color pigments.
  • the solvent for. B. dissolved in water color pigments.
  • the so-called light hydraulic effect in which by means of a light pulse in a liquid, a shock wave is generated, wherein the light pulse is entered directly into the liquid or indirectly acting on the liquid and in both cases in the liquid punctually abruptly to a thermal conditional volume expansion leads.
  • the light hydraulic effect is z. B. in the EP 0 836 939 B1 with details of further sources.
  • the printing substance is applied as a homogeneous film on a color carrier, wherein the color carrier z. B. is designed as a rotating cylinder, preferably as a transparent hollow cylinder made of glass.
  • the ink carrier and the printing material are guided past each other without touching each other.
  • an absorption layer is applied, which is applied over the entire surface, the energy beam first penetrates the non-absorbing for its wavelength in this case printing substance and only then meets its radiation energy z. B.
  • the absorption layer is preferably made of a crystalline material, preferably of polysilicate, wherein the crystal size is between 10 nm and 1000 nm and advantageously less than the wavelength of the energy beam used.
  • the thickness of the absorption layer should be less than 10 microns, preferably less than 1 micron.
  • An energy beam directed onto the printing substance should be incident at an angle ⁇ to the normal of the surface of the printing substance of more than 0 ° and less than 75 °.
  • the distance between the ink carrier and the printing material moved past it at a transport speed is given as less than 2 mm, preferably even less than 0.5 mm.
  • the pulse duration of the energy radiation should be less than 1 ⁇ s, preferably between 100 ns and 200 ns.
  • the power of the energy radiation is on the order of 50 W to 100 W or more.
  • an energy source for example, laser diodes or arrays, ie arrangements of laser diodes, mentioned. Specific information on the wavelength and pulse repetition frequency of the energy radiation used are missing.
  • each color carrier is assigned a controlled by a control device radiation source, each radiation source emits radiant energy to at least one of the color carrier, wherein one of the color carrier received radiant energy transmission influenced by at least a part of the printing substance of this ink carrier to a spaced apart from this ink carrier printing material, wherein the ink carrier are arranged below each other in the transport direction of the printing material.
  • This printing machine allows by multiple arrangement of the same printing a Multi-color printing, however, gives the US 6,330,857 B1 no indication of how this multicolor print is actually executed.
  • the DE 197 46 174 C1 is a printing press with four in the transport direction of a printing material successively arranged printing units known, the printing units each print out different colors. Each of these prints the color z. B. using a light hydraulic effect. It's the DE 197 46 174 C1 can not be deduced that the printing units print different color separations of the same print image.
  • An ink jet pen is known in which ink is applied in a thin layer of 10 .mu.m to 100 .mu.m on a glass substrate or ribbon and punctually with a modulated depending on an image signal beam of a Lasers, preferably a CO 2 laser, for a period of 0.1 .mu.s to 1 .mu.s to over 100 ° C is heated, so that a bubble forms, the ink at their bursting to a short distance of less than 1 mm transfers the substrate or ribbon with the heated ink pasted substrate.
  • a Lasers preferably a CO 2 laser
  • an ink jet pen for printing a plurality of inks such as red, green, blue and black commercial water-soluble ink, wherein for each ink, an ink cartridge is provided, which is sequentially introduced into the beam path of the laser.
  • inks with a low light absorption such. B. red or yellow ink in particular, is applied uniformly on the substrate light-absorbing film with a layer thickness of less than 20 microns is used, which is incident on the light beam of the laser, wherein the light-absorbing film in contact with the ink to the formation of a Bubble heated in the ink, wherein the bubble is expelled in the direction of the printing material from the ink cartridge.
  • the printing method utilizing the light hydraulic effect is a printing method which does not use a permanent, mechanically stable printing form.
  • the invention has for its object to provide a printing machine with at least two each carrying a printing substance color carriers, said printing machine using a non-permanent printing form using a printing process multicolored print image good print quality, in particular with respect to its Farbregisterhaltmaschine and Rastererton density generated.
  • a printing machine with at least two color carriers, wherein on the color carriers, a printing substance is applied, wherein in the preferred embodiment, a transfer of at least a portion of the printing substance spaced from each of the ink carrier arranged printing material z.
  • B. carried out using the light hydraulic effect, being transported to the printing substance, d. H. emitted by a radiation source and received by the printing substance radiation energy stimulates the transfer of the printing substance to the substrate or at least influenced.
  • the achievable with the present invention consist in particular that in the printing process, a synchronization for the made of several color carriers transfer of their printing substance to the substrate for generating a common printed image corresponding to the colorimetric image belonging to the printed image is provided and made with the transfer of the printing substance
  • Area coverage of the printing material can be influenced in terms of their optical efficiency.
  • Fig. 1 shows in a simplified representation of a printing unit of a printing press with at least one first color carrier 01, the z. B. is formed as a first rotating cylinder 01.
  • an absorption layer 03 is applied to a lateral surface 02 of the cylinder 01, wherein the absorption layer 03 is formed over the entire surface smooth or in the form of a regular or irregular structure, wherein the structure z. B. in the form of introduced into the surface of the absorption layer 03 depressions, in particular of very small wells can be designed.
  • the absorption layer 03 has a layer thickness z. B. of less than 20 microns, especially less than 5 microns. She is in the Fig. 1 and 2 for drawing technical reasons for better visibility shown greatly enlarged.
  • a cylinder 01 associated with the first inking unit 04 carries z. B. with at least one inking roller 06 a film of a first printing substance 07 preferably over the entire surface of this cylinder 01, wherein z. B. the wells of the absorption layer 03 are filled with the printing substance 07.
  • the film of the printing substance 07 is in the Fig. 1 and 2 shown enlarged.
  • a printing material 08, z. B. a sheet 08 or a web of material 08, in particular a paper web 08 is arranged at a distance a of preferably less than 2 mm, in particular less than 0.5 mm in front of the first cylinder 01 or is preferably with a preferably a rotational speed v01 the cylinder 01 adapted transport speed v81 before the cylinder 01 moved past.
  • a first deflection roller 09 or guide roller 09 can be provided in the axial direction of the cylinder 01, which preferably supports the printing material 08 in its position, ie. H.
  • the printing material 08 in particular deflects in a direction away from the cylinder 01 direction.
  • At least one second radiation source 14 also with a low beam divergence, z. B.
  • a laser 14, in particular a solid-state laser 14 also emits radiant energy high energy density in the form of a second energy beam 16 z. B. to the first cylinder 01 applied on the first printing substance 07, wherein the second energy beam 16 z. B. also with the normal 13 of the surface 19 of the first printing substance 07 or a normal 27 of a surface 19 of a second printing substance 26 forms an angle ⁇ of more than 0 ° and less than 90 °, preferably less than 45 °.
  • the arrangement of the radiation sources 11; 14 may be chosen such that the between the normals 13; 27 and the energy beams 12; 16 trained angle ⁇ ; ⁇ are at least approximately equal. Also, the radiation sources 11; 14 be designed such that they z. B.
  • a single radiation source which is capable of at least two energy beams 12; 16 to emit, the energy beams 12; 16 have different wavelengths.
  • some laser systems can optionally be used to emit energy beams 12; Stimulate 16 different wavelengths.
  • frequency-doubled or frequency-tripled neodymium-YAG lasers are mentioned here whose energy beams 12; 16 have half or one third of their natural wavelength of 1064 nm.
  • the radiation sources 11; 14 result in that a single radiation source 11, 14, z.
  • a dye laser in which preferably organic dyes, eg. As rhodamines, coumarins or oxazines in a carrier medium, for. B.
  • a carrier liquid are dissolved, radiation energy in a spectral range of z. B. 60 nm or more, from the at least two energy beams 12; 16 different wavelength preferably by optical devices, eg. B. are separated by filters.
  • the radiation sources 11; 14 emit their radiation energy z. B. continuously, but preferably in pulses of short duration, z. B. in pulses of significantly less than 1 microseconds, in particular of about 100 ns, but with a high pulse repetition frequency of z. 1 MHz or more.
  • An intensity of the radiation sources 11; 14 emit radiation energy can z. B. be adjusted by the duration of the pulses or by their amplitude.
  • the applied on the ink carrier 01 absorption layer 03 absorbs the radiation from the sources 11; 14 emitted radiant energy and converts them into heat or in a momentum transfer, which is formed in accordance with the preferred applied light hydraulic effect in the printing substance 07 by thermal expansion or evaporation explosively a gas bubble, on its exit from the printing substance 07 a portion 18 of the printing substance 07 in the direction displaced from the printing substance 07 spaced printing substrate 08 and there sets a pressure point.
  • Fig. 2 which is an enlarged detail of the Fig. 1 FIG. 2 shows, by way of example, how the incidence of energy beams 12; 16 a part 18 of the printing substance 07, z. B.
  • the size or amount of the transferred to the substrate 08 portion 18 of the printing substance 07 is of the introduced into the printing substance 07 intensity of the energy beam 12; 16, which is why a made with the transfer of the printing substance 07 area coverage of the printing substrate 08 can be influenced in terms of their optical efficiency, ie a size and density of applied to the substrate 08 by the transfer of the printing substance 07 pressure points on the introduced into the printing substance 07 intensity the energy beam 12; 16 controllable. In this way the halftone density is controlled.
  • a second color carrier 21 is provided which is preferably substantially similar to the above-described first color carrier 01 in construction and in its use, ie, for. B. as a second rotating cylinder 21 z. B. is formed with an absorption layer 22, wherein on the surface of the second cylinder 21, ie preferably on the absorption layer 22, with a second cylinder 21 associated second inking unit 23 with z. B. at least one inking roller 24, a second printing substance 26 is applied, wherein the first printing substance 07 and the second printing substance 26 preferably differ in their material nature or in their spectral behavior.
  • the printing substances used 07; 26 z. B. be formed as two different printing inks, z.
  • the first printing substance 07 as a chromatic color and the second printing substance 26 as a black color, which are suitable for the energy beams 12 available in the printing machine; 16 have a different absorption capacity from each other.
  • the printing substances 07; 26 is usually a dispersion of a solid colorant, a liquid binder and optionally a printing assistant, the printing substance 07; 26 is added to a specific property of the printing substance 07; To achieve 26, such. B. their consistency, drying, abrasion resistance or gloss, wherein the colorant, z. As powdered pigments in the binder, z. B. a viscous, oily varnish is finely distributed.
  • the printing substances 07; 26 are therefore preferably of liquid or at least flowable consistency.
  • the printing material 08 is arranged at a distance b of preferably less than 2 mm, in particular less than 0.5 mm in front of the second cylinder 21 or is at a transport speed v82, which is preferably adapted to a rotational speed v21 of the second cylinder 21, before the second cylinder 21 passed.
  • the rotational speed v21 of the second cylinder 21 and the transport speed v82 of the printing material 08 close to the second cylinder 21 may deviate from the rotational speed v01 of the first cylinder 01 and the transport speed v81 of the printing substrate 08 close to the first cylinder 01.
  • the printing material 08 in front of the second cylinder 21 may be provided in the axial direction of this cylinder 21, a second guide roller 29 or guide roller 29, the printing material 08 on the one hand in its position, d. H. stabilized in particular at its distance b in front of the second cylinder 21 and the printing substrate 08 on the other hand makes it deflectable in the transport direction of the second cylinder 21, d. H. the printing material 08 in particular deflects in a direction away from the second cylinder 21 direction.
  • the printing material 08 formed as a coherent material web 08 is z. B. by means of an arrangement of third pulleys 31 or guide rollers 31 passed from the first cylinder 01 to the second cylinder 21.
  • the printing press can be expanded as required by further color carrier and radiation sources, but this is not shown in detail in the figures for the sake of clarity. In this way, the printing press is upgraded to a multi-color printing machine, which is able, for.
  • the energy beams 12; 16, preferably those of different wavelengths, on the same, z. B. be directed to the first color carrier 01.
  • This option allows, on the same color carrier 01 printing substances 07 z. B. the same color, but still different material quality to be printed, the different physical condition z. B. may be due to different formulations of the printing substances 07.
  • An alternative arrangement provides that at least one energy beam 12; 16 is directed to another second color carrier 21 or optionally is at least directable. Also, arrangements may be provided in which z. B.
  • a first energy beam 12 is directed at a first wavelength
  • a second energy beam 16 with a second wavelength is directed at almost the same time, the wavelengths of the energy beams 12; 16 preferably differ from each other.
  • an energy beam 12; 16 with the on the respective color carrier 01; 21 applied printing substance 07; Be directed 26 optimal wavelength wherein the energy beams 12; 16 in their respective wavelength according to the material nature and / or the spectral behavior of the respective printing substance 07; 26 different from each other.
  • an energy beam 12; 16 with a for the transmission of the respective printing substance 07; 26 optimal wavelength can be selected and set.
  • a color carrier 01 could on a color carrier 01; 21 with the color magenta a frequency-doubled neodymium YAG laser with a lying in the green spectral range wavelength of 532 nm, on a color carrier 01; 21 with the cyan color a ruby laser with a wavelength in the red spectral range of 694 nm and on a color carrier 01; 21 with the chromatic yellow (yellow) a GaN semiconductor laser with a lying in the violet-blue spectral wavelength of 395 nm to 440 nm.
  • the transfer of the respective printing substance 07; 26 is optimal when the absorption of the incident energy beam 12; 16 has its highest efficiency, which is the case when an energy beam 12; 16 with a wavelength of a to the printing substance 07; 26 complementary spectral range is used.
  • a color carrier 01; 21 with the black color can in principle energy beams 12; 16 of any wavelength can be used, however, is in its fundamental frequency operated neodymium-YAG laser with a lying in the infrared range wavelength of 1064 nm is particularly well.
  • a single printing machine it is also possible for a single printing machine to have a plurality of radiation sources 11; 14 of different types or with energy beams 12; Be provided 16 different wavelength, so that with respect to the radiation sources 11; 14 and possibly also their arrangement in the printing press results in a solution in the demand selectively for each color carrier 01; 21 and each printing substance 07; 26 the optimal radiation source 11; 14 and the energy beam 12; 16 with the for printing the printing substance 07; 26 optimal wavelength, pulse duration or amount of radiation energy can be used. So z. B.
  • each of the four color carriers 01; 21 each as a cylinder 01; 21 can thus at three color carriers 01; 21, the energy beam 12; 16 from the outside on the cylinder 01; 21 be directed, whereas in the fourth color carrier 01 of the associated energy beam 12 is directed from the interior of the cylinder 01 to the printing substance 07.
  • the energy beam 12 emitting radiation source 11 z. B. be arranged inside the cylinder 01 or the energy beam 12 is directed by the outside of the cylinder 01 arranged radiation source 11 by optical means in the interior of the cylinder 01 and from there z. B. directed by means of mirror to the printing substance 07.
  • the radiation sources 11; 14 are preferably arranged stationary with respect to the printing press.
  • the laser systems are with their peripheral aggregates, z. B. with the devices for their power supply or cooling, preferably arranged outside the printing press, but they can also in the interior of a cylinder 01; 21 trained color carrier 01; Be arranged 21 and the energy beam 12; 16 of the radiation sources 11; 14 is by optical means in the interior of the cylinder as 01; 21 trained color carrier 01; 21 passed to from there to the printing substance 07; 26 to be addressed.
  • the of the radiation sources 11; 14 emitted energy beams 12; 16 may be changeable with respect to their beam path, z. B. by optical guidance systems or deflection systems to different locations of the printing press, in particular to different color carriers 01; 21 be conductive.
  • a printed image produced in multicolor printing is usually composed of a plurality of color separations, also called partial color separations, wherein each color separation brings pixels of a single ink into the common print image, whereby several color separations are printed one above the other, so that the pixels of the color separations involved in the construction of the common print image side by side , sometimes also freestanding next to each other, and / or come to rest on each other.
  • this print-technical print image structure is a so-called autotypical color mixing process both with a subtractive color mixing by the overprinting of the pixels of individual printing inks and with an additive color mixing by integrating the pixels of individual printing inks through the eye of a viewer.
  • the color carrier 01; 21 of the printing machine sequentially print at least a portion of the common, composed of several color separations print image on the substrate 08, wherein the printing press in a running printing process usually a plurality of similar printed images successively on the transported by the printing press substrate 08 prints.
  • the quality of the multicolored print image is decisively influenced by how precisely positioned the pixels of the color separations involved in the construction of the common print image are arranged relative to each other. This positional accuracy of the correlated pixels from different color separations is also referred to as a passer or as the color register.
  • a preferably electronic, z. B. in a control station of the printing machine integrated controller 28 is provided, wherein the controller 28 peripheral devices (not shown) as an input unit, for. As a keyboard, and / or an output unit, for. As a monitor, and may be connected for the reception and transfer of data to a data network.
  • the controller 28 sends z. B. by a corresponding control of the radiation sources 11;
  • the radiation energy to be directed onto the second color carrier 21 is offset in time from the radiation energy directed onto the first color carrier 01, wherein the time offset synchronizes the sequential pressure of the color separations associated with the same print image, ie coincides precisely so that the pixels in each color separation for the common image in the desired manner correlate.
  • Such a temporal offset can also be between other belonging to the printing press color carriers 01; 21
  • the temporal offset can always be based on the first ink carrier 01 in the sequential printing or the temporal offset of the second ink carrier 21 always on the ink carrier 01 immediately preceding it.
  • the time offset corresponds to z. B. a transport time of the printing material 08 between the locations of the transfer of the printing substance 07; 26, the color carrier 01; 21st
  • At least two color carriers 01; 21 of the printing press each as a rotating cylinder 01; 21 are formed, wherein the cylinder 01; 21 each one of the controller 28 independently of each other controlled drive 32; 33, the control device 28, the cylinder 01; 21 with respect to their angular position such that the corresponding with the to be directed to the second color carrier 21 radiation energy angular position of the second color carrier 21 forming cylinder 21 to the corresponding with the directed to the first color carrier 01 radiant energy angular position of the first color carrier 01 forming cylinder 01 is offset by an angle, wherein the respective angular position of the ink carrier 01; 21 is each related to a fixed reference point, z. B. to a designated 0 ° angular position.
  • the controller 28 controls the cylinders 01; 21 with respect to their angular position, in particular such that the angular offset in dependence on the rotational speed v01 of the first cylinder 01 and the rotational speed v21 of the second cylinder 21 synchronizes the sequential pressure of the color separations belonging to the same print image.
  • the angular offset between the cylinders 01; 21 corresponds in this way z. B. with the transport time of the printing material 08 between the locations of the transfer of the printing substance 07; 26, the color carrier 01; 21st
  • the drives 32; 33, the cylinder 01; 21 are z. B. as electric motors 32; 33 formed, in particular as in their respective angular position by the control device 28 controllable or controllable motors 32; 33. In practice, it is often sufficient for the motors 32; 33 to control. Provided a feedback from the motors 32; 33 to Control device 28, the motors 32; 33 are also regulated to compensate for disturbing influences.
  • the said control device 28 may also be suitable for the function of the rules if required.
  • all color carrier 01; 21 of the printing press each as a rotating cylinder 01; 21 formed, wherein z. B. all cylinders 01; 21 controllable or controllable motors 32; 33 have.
  • the drives 32; 33 are z. B. coaxial with the axis of the cylinder 01; 21 arranged and preferably with the axis of the cylinder 01; 21 rigidly connected.
  • an image processing system is also provided in or on the printing machine, wherein the image processing system captures at least a portion of at least one printed or printed color separation as an image, wherein the controller 28, in response to the image acquired by the image processing system, images the color carriers 01; 21 in directing radiant energy controls in their intensity and thus affects the halftone density at least one color separation.
  • control device 28 for the synchronization of the color carriers 01; 21 sequentially printed color separations of the same print image receives data from a pre-press upstream of the printing process.
  • the data from the prepress define a target position with respect to all, but at least one of the printed or printed color separations. If data relating to the color separations is not available from the pre-press, these data required as a reference can also be obtained from one or more images, the image or images being taken by a reference print image correlating with the print image to be printed.
  • the actual position of a printed or printed color separation is z. B. determined with the at least a portion of the print image detecting image processing system.
  • the image processing system in the transport direction of the printing substrate 08 before the ink carrier 01; 21 of the color separation to be printed and / or behind the Color carrier 01; 21 of the printed color separation arranged image sensor 34, wherein the image sensor 34 z. B. as a CCD chip in a camera, z. B. a line camera or area camera, in particular a color camera is formed.
  • the image processing system may, for. B.
  • the image sensor 34 conducts its output signal to the control device 28.
  • the image processing system controls with the controller 28 in response to the output signal of the image sensor 34 z.
  • B. the intensity of the on the color carrier 01; 21 directed radiation energy. It is provided that the control device 28, the intensity of the color carrier 01; 21 directed radiation energy by changing the duration of the initiation and / or an amplitude of the radiation energy controls.
  • characteristic and suitable cut-outs are preferably selected, by means of which the position of the individual currently recorded color separations for the respective partial color separation serving as a reference is determined. This is the target position for a comparison with an image taken in the current printing process of a color separation belonging to the printed image.
  • the selection of suitable printed image sections can be done manually by the operator or automatically z. B. by the controller 28, z. B. for a presetting of the desired position, done.
  • Suitable printed image sections with regard to the color register are areas within the printed image in which the ink to be measured as well as to be adjusted in register dominates or exclusively occurs.
  • each printed image produced by the image processing system is preferably detected and decomposed into its color separations or in the course of generating a print image whose individual are already printed Color separations recorded.
  • the position of the individual color separations is determined within the previously defined, suitable printed image sections. This is done by comparison with the color separations from the reference print image z. B. by a correlation method, in particular a cross-correlation method. By means of the correlation method, the position of the color separations can be determined very accurately. This comparison can also be repeated several times for each print image to increase the accuracy of the measurement.
  • the determination of the position of the individual color separations takes place in the transport direction of the printing material 08 and / or in the transverse direction to the transport direction.
  • the position differences thus obtained are converted by the control device 28 into setting commands and used as correction signals z. B. to the radiation sources 11; 14 or to the drives 32; 33 sent for their respective synchronization.
  • control device 28 then sends the radiation energy to be directed onto the second color carrier 21 offset in time from the radiation energy directed onto the first color carrier 01 when the z. B. deviates with the image processing system detected actual position of a printed or printed color separation from its desired position by more than an allowable tolerance value.
  • controller 28 controls the cylinders 01; 21 with respect to their angular position then such that the angular position of the second cylinder 21 corresponding to the radiation energy to be directed to the second color carrier 21 is offset by an angle to the angular position of the first cylinder 01 corresponding to the radiation energy directed to the first color carrier 01, if the z. B.
  • the permissible tolerance values for the positional accuracy lying in the range of at most a few 1/100 mm can, for. B. preset to the controller 28 and changed if necessary.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Printing Methods (AREA)
  • Electronic Switches (AREA)
  • Printers Characterized By Their Purpose (AREA)

Abstract

The machine has two color carriers in a transfer direction of printing substrates (08), and including printing substances (07, 26). Radiation sources send radiation energy to the substances. A controlling device (28) controls the sources based on the transfer duration of printing substrates between places where the substances are transferred, such that the sequential printing is synchronized to create color epitomes of a print image.

Description

Die Erfindung betrifft eine Druckmaschine mit mindestens zwei jeweils eine Drucksubstanz tragenden Farbträgern gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a printing press with at least two color carriers, each carrying a printing substance, according to the preamble of claim 1.

Aus der WO 01/72518 A1 ist ein Druckverfahren bekannt, das in der Lage ist, eine Drucksubstanz mit Hilfe eines vorzugsweise gepulsten und fokussierten Energiestrahls, z. B. eines Laserstrahls oder Elektronenstrahls zu verdrucken. Dazu wird die Energie des Energiestrahls entweder unmittelbar oder nach einer Wandlung in einer Absorptionsschicht indirekt in die Drucksubstanz eingetragen, wobei die Drucksubstanz z. B. aus in einem Lösungsmittel, z. B. in Wasser gelösten Farbpigmenten besteht. In beiden Fällen bildet sich aufgrund der hohen Energiedichte der Energiestrahlung in der Drucksubstanz durch Wärmedehnung oder Verdampfen insbesondere des Lösungsmittels explosionsartig eine kleine Gasblase aus, die bei ihrem Austritt aus der Drucksubstanz einen Teil der Drucksubstanz in Richtung eines von der Drucksubstanz gering beabstandeten Bedruckstoffes verdrängt und dort einen Druckpunkt setzt. Bei diesem Druckverfahren wird der sogenannte lichthydraulische Effekt genutzt, bei dem mittels eines Lichtimpulses in einer Flüssigkeit eine Stoßwelle erzeugt wird, wobei der Lichtimpuls direkt in die Flüssigkeit eingetragen wird oder mittelbar auf die Flüssigkeit einwirkt und in beiden Fällen in der Flüssigkeit punktuell schlagartig zu einer thermisch bedingten Volumenerweiterung führt. Der lichthydraulische Effekt ist z. B. in der EP 0 836 939 B1 unter Angabe weiterer Quellen näher beschrieben.From the WO 01/72518 A1 a printing method is known which is capable of a printing substance by means of a preferably pulsed and focused energy beam, for. B. a laser beam or electron beam to print. For this purpose, the energy of the energy beam is entered either directly or after a conversion in an absorption layer indirectly in the printing substance, wherein the printing substance z. B. from in a solvent, for. B. dissolved in water color pigments. In both cases, formed due to the high energy density of the energy radiation in the printing substance by thermal expansion or evaporation of the solvent in particular explosively a small gas bubble, which displaces a part of the printing substance in the direction of a slightly spaced from the printing material printing material on its exit from the printing substance and there sets a pressure point. In this printing method, the so-called light hydraulic effect is used, in which by means of a light pulse in a liquid, a shock wave is generated, wherein the light pulse is entered directly into the liquid or indirectly acting on the liquid and in both cases in the liquid punctually abruptly to a thermal conditional volume expansion leads. The light hydraulic effect is z. B. in the EP 0 836 939 B1 with details of further sources.

Gemäß der genannten WO 01/72518 A1 ist die Drucksubstanz als ein homogener Film auf einem Farbträger aufgetragen, wobei der Farbträger z. B. als ein rotierender Zylinder, vorzugsweise als ein transparenter Hohlzylinder aus Glas ausgebildet ist. Der Farbträger und der Bedruckstoff werden aneinander vorbeigeführt, ohne sich zu berühren. Sofern auf dem Farbträger eine Absorptionsschicht aufgebracht ist, die vollflächig aufgetragen ist, durchdringt der Energiestrahl zunächst die für seine Wellenlänge in diesem Fall nicht absorbierende Drucksubstanz und trifft erst dann auf die seine Strahlungsenergie z. B. in Wärme oder in einen Impulsübertrag wandelnde Absorptionsschicht, wobei die Absorptionsschicht vorzugsweise aus einem kristallinen Werkstoff besteht, vorzugsweise aus Polysilikat, wobei die Kristallgröße zwischen 10 nm und 1000 nm liegt und vorteilhafterweise kleiner als die Wellenlänge der verwendeten Energiestrahlung ist. Die Dicke der Absorptionsschicht soll kleiner als 10 µm, vorzugsweise kleiner als 1 µm sein. Ein auf die Drucksubstanz gerichteter Energiestrahl soll unter einem Winkel α zur Normalen der Oberfläche der Drucksubstanz von mehr als 0° und weniger als 75° einfallen. Der Abstand zwischen dem Farbträger und dem an ihm mit einer Transportgeschwindigkeit vorbeibewegten Bedruckstoff wird mit weniger als 2 mm, vorzugsweise sogar weniger als 0,5 mm angegeben. Die Impulsdauer der Energiestrahlung soll weniger als 1 µs, vorzugsweise zwischen 100 ns und 200 ns betragen. Die Leistung der Energiestrahlung liegt in einer Größenordnung von 50 W bis 100 W oder auch mehr. Als Energiequelle sind beispielhaft Laserdioden oder Arrays, d. h. Anordnungen von Laserdioden, erwähnt. Konkrete Angaben zur Wellenlänge und Impulsfolgefrequenz der verwendeten Energiestrahlung fehlen.According to the mentioned WO 01/72518 A1 the printing substance is applied as a homogeneous film on a color carrier, wherein the color carrier z. B. is designed as a rotating cylinder, preferably as a transparent hollow cylinder made of glass. The ink carrier and the printing material are guided past each other without touching each other. Unless on the ink carrier an absorption layer is applied, which is applied over the entire surface, the energy beam first penetrates the non-absorbing for its wavelength in this case printing substance and only then meets its radiation energy z. B. in heat or in a momentum transfer absorbing layer, wherein the absorption layer is preferably made of a crystalline material, preferably of polysilicate, wherein the crystal size is between 10 nm and 1000 nm and advantageously less than the wavelength of the energy beam used. The thickness of the absorption layer should be less than 10 microns, preferably less than 1 micron. An energy beam directed onto the printing substance should be incident at an angle α to the normal of the surface of the printing substance of more than 0 ° and less than 75 °. The distance between the ink carrier and the printing material moved past it at a transport speed is given as less than 2 mm, preferably even less than 0.5 mm. The pulse duration of the energy radiation should be less than 1 μs, preferably between 100 ns and 200 ns. The power of the energy radiation is on the order of 50 W to 100 W or more. As an energy source, for example, laser diodes or arrays, ie arrangements of laser diodes, mentioned. Specific information on the wavelength and pulse repetition frequency of the energy radiation used are missing.

Durch die US 6,330,857 B1 ist eine Druckmaschine gemäß dem Oberbegriff des Anspruchs 1 mit mehreren jeweils eine Drucksubstanz tragenden Farbträgern bekannt, wobei jedem Farbträger eine von einer Steuereinrichtung gesteuerte Strahlungsquelle zugeordnet ist, wobei jede Strahlungsquelle Strahlungsenergie zu mindestens einem der Farbträger entsendet, wobei von einem der Farbträger empfangene Strahlungsenergie eine Übertragung von zumindest einem Teil der Drucksubstanz dieses Farbträgers auf einen von diesem Farbträger beabstandet angeordneten Bedruckstoff beeinflusst, wobei die Farbträger in Transportrichtung des Bedruckstoffes einander nachfolgend angeordnet sind. Diese Druckmaschine ermöglicht durch mehrfache Anordnung desselben Druckwerks einen Mehrfarbendruck, jedoch gibt die US 6,330,857 B1 keinen Hinweis darauf, wie dieser Mehrfarbendruck tatsächlich ausgeführt wird.By the US 6,330,857 B1 is a printing machine according to the preamble of claim 1 with a plurality of printing substance-carrying color carriers known, each color carrier is assigned a controlled by a control device radiation source, each radiation source emits radiant energy to at least one of the color carrier, wherein one of the color carrier received radiant energy transmission influenced by at least a part of the printing substance of this ink carrier to a spaced apart from this ink carrier printing material, wherein the ink carrier are arranged below each other in the transport direction of the printing material. This printing machine allows by multiple arrangement of the same printing a Multi-color printing, however, gives the US 6,330,857 B1 no indication of how this multicolor print is actually executed.

Durch die DE 197 46 174 C1 ist eine Druckmaschine mit vier in Transportrichtung eines Bedruckstoffes hintereinander angeordneten Druckwerken bekannt, wobei die Druckwerke sich jeweils voneinander unterscheidende Farben verdrucken. Jedes dieser Druckwerke verdruckt die Farbe z. B. unter Nutzung eines lichthydraulischen Effekts. Es ist der DE 197 46 174 C1 nicht entnehmbar, dass die Druckwerke verschiedene Farbauszüge desselben Druckbildes drucken.By the DE 197 46 174 C1 is a printing press with four in the transport direction of a printing material successively arranged printing units known, the printing units each print out different colors. Each of these prints the color z. B. using a light hydraulic effect. It's the DE 197 46 174 C1 can not be deduced that the printing units print different color separations of the same print image.

Durch die DE 37 02 643 A1 ist ein Tintenstrahlschreiber bekannt, wobei Tinte in einer dünnen Schicht von 10 µm bis 100 µm auf ein Glassubstrat oder Farbband aufgetragen und punktuell mit einem in Abhängigkeit von einem Bildsignal modulierten Strahl eines Lasers, vorzugsweise eines CO2-Lasers, für eine Dauer von 0,1 µs bis 1 µs auf über 100°C erwärmt wird, sodass sich eine Blase bildet, die bei ihrem Platzen Tinte auf einen in geringem Abstand von weniger als 1 mm an dem Glassubstrat oder Farbband mit der erwärmten Tinte vorbeigeführten Bedruckstoff überträgt. In einem Ausführungsbeispiel ist ein Tintenstrahlschreiber zum Verdrucken mehrerer Druckfarben wie rote, grüne, blaue und schwarze handelsübliche wasserlösliche Tinte beschrieben, wobei für jede Druckfarbe eine Tintenpatrone vorgesehen ist, die sequentiell in den Strahlengang des Lasers eingebracht wird. Für Druckfarben mit einem geringem Lichtabsorptionsvermögen, wie z. B. rote oder insbesondere gelbe Tinte, kommt ein gleichmäßig auf das Substrat aufgestrichener lichtabsorbierender Film mit einer Schichtdicke von unter 20 µm zum Einsatz, auf den der Lichtstrahl des Lasers auftrifft, wobei der lichtabsorbierende Film die mit ihm in Berührung stehende Tinte bis zur Ausbildung einer Blase in der Tinte erwärmt, wobei die Blase in Richtung des Bedruckstoffes aus der Tintenpatrone ausgetrieben wird.By the DE 37 02 643 A1 An ink jet pen is known in which ink is applied in a thin layer of 10 .mu.m to 100 .mu.m on a glass substrate or ribbon and punctually with a modulated depending on an image signal beam of a Lasers, preferably a CO 2 laser, for a period of 0.1 .mu.s to 1 .mu.s to over 100 ° C is heated, so that a bubble forms, the ink at their bursting to a short distance of less than 1 mm transfers the substrate or ribbon with the heated ink pasted substrate. In one embodiment, an ink jet pen is described for printing a plurality of inks such as red, green, blue and black commercial water-soluble ink, wherein for each ink, an ink cartridge is provided, which is sequentially introduced into the beam path of the laser. For inks with a low light absorption, such. B. red or yellow ink in particular, is applied uniformly on the substrate light-absorbing film with a layer thickness of less than 20 microns is used, which is incident on the light beam of the laser, wherein the light-absorbing film in contact with the ink to the formation of a Bubble heated in the ink, wherein the bubble is expelled in the direction of the printing material from the ink cartridge.

Da in der Drucktechnik Drucksubstanzen unterschiedlicher Farbe und damit auch mit unterschiedlicher stofflicher Beschaffenheit zum Einsatz kommen, wobei die voneinander verschiedenen Drucksubstanzen z. B. auf unterschiedlichen Farbträgern in derselben Druckmaschine angeordnet sein können, ist es wünschenswert, dass mit derselben Druckmaschine unterschiedliche Drucksubstanzen z. B. gemäß dem eingangs beschriebenen Druckverfahren verdruckt werden können. Das den lichthydraulischen Effekt nutzende Druckverfahren ist ein Druckverfahren, welches keine permanente, mechanisch stabile Druckform verwendet.Since in printing technique printing substances of different colors and thus also with different material properties are used, wherein the mutually different printing substances z. B. can be arranged on different color media in the same printing press, it is desirable that different printing substances z. B. can be printed according to the printing method described above. The printing method utilizing the light hydraulic effect is a printing method which does not use a permanent, mechanically stable printing form.

Der Erfindung liegt die Aufgabe zugrunde, eine Druckmaschine mit mindestens zwei jeweils eine Drucksubstanz tragenden Farbträgern zu schaffen, wobei diese Druckmaschine unter Anwendung eines keine permanente Druckform verwendenden Druckverfahrens ein mehrfarbiges Druckbild guter Druckqualität, insbesondere hinsichtlich seiner Farbregisterhaltigkeit und Rastertondichte, erzeugt.The invention has for its object to provide a printing machine with at least two each carrying a printing substance color carriers, said printing machine using a non-permanent printing form using a printing process multicolored print image good print quality, in particular with respect to its Farbregisterhaltigkeit and Rastererton density generated.

Die Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.The object is achieved by the features of claim 1.

Es wird nachfolgend eine Druckmaschine mit mindestens zwei Farbträgern beschrieben, wobei auf den Farbträgern eine Drucksubstanz aufgetragen ist, wobei in der bevorzugten Ausführung eine Übertragung zumindest eines Teils der Drucksubstanz auf einen von jedem der Farbträger beabstandet angeordneten Bedruckstoff z. B. unter Nutzung des lichthydraulischen Effekts erfolgt, wobei zur Drucksubstanz transportierte, d. h. von einer Strahlungsquelle entsandte und von der Drucksubstanz empfangene Strahlungsenergie die Übertragung der Drucksubstanz auf den Bedruckstoff anregt oder zumindest beeinflusst.It is described below a printing machine with at least two color carriers, wherein on the color carriers, a printing substance is applied, wherein in the preferred embodiment, a transfer of at least a portion of the printing substance spaced from each of the ink carrier arranged printing material z. B. carried out using the light hydraulic effect, being transported to the printing substance, d. H. emitted by a radiation source and received by the printing substance radiation energy stimulates the transfer of the printing substance to the substrate or at least influenced.

Die mit der Erfindung erzielbaren Vorteile bestehen insbesondere darin, dass im Druckprozess eine Synchronisation für die von mehreren Farbträgern vorgenommene Übertragung von deren Drucksubstanz auf den Bedruckstoff zur Erzeugung eines gemeinsamen Druckbildes entsprechend der zu dem Druckbild gehörenden Farbauszüge vorgesehen ist und die mit der Übertragung der Drucksubstanz vorgenommene Flächendeckung des Bedruckstoffes hinsichtlich ihrer optischen Wirksamkeit beeinflussbar ist.The achievable with the present invention consist in particular that in the printing process, a synchronization for the made of several color carriers transfer of their printing substance to the substrate for generating a common printed image corresponding to the colorimetric image belonging to the printed image is provided and made with the transfer of the printing substance Area coverage of the printing material can be influenced in terms of their optical efficiency.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im Folgenden näher beschrieben.Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Es zeigen:

Fig. 1
eine vereinfachte Darstellung eines Druckwerks einer Druckmaschine;
Fig. 2
eine Ausschnittsvergrößerung aus der Fig. 1 zur Darstellung des Druckvorgangs.
Show it:
Fig. 1
a simplified representation of a printing unit of a printing press;
Fig. 2
an excerpt from the Fig. 1 for displaying the printing process.

Fig. 1 zeigt in einer vereinfachten Darstellung ein Druckwerk einer Druckmaschine mit mindestens einem ersten Farbträger 01, der z. B. als ein erster rotierender Zylinder 01 ausgebildet ist. Vorzugsweise ist auf einer Mantelfläche 02 des Zylinders 01 eine Absorptionsschicht 03 aufgebracht, wobei die Absorptionsschicht 03 vollflächig glatt oder in Form einer regelmäßigen oder unregelmäßigen Struktur ausgebildet ist, wobei die Struktur z. B. in Form von in die Oberfläche der Absorptionsschicht 03 eingebrachten Vertiefungen, insbesondere von sehr kleinen Näpfchen, gestaltet sein kann. Die Absorptionsschicht 03 weist eine Schichtdicke z. B. von weniger als 20 µm, insbesondere weniger als 5 µm auf. Sie ist in den Fig. 1 und 2 aus zeichnungstechnischen Gründen zur besseren Erkennbarkeit stark vergrößert dargestellt. Ein dem Zylinder 01 zugeordnetes erstes Farbwerk 04 trägt z. B. mit mindestens einer Farbauftragswalze 06 einen Film einer ersten Drucksubstanz 07 vorzugsweise vollflächig auf diesem Zylinder 01 auf, wobei z. B. die Näpfchen der Absorptionsschicht 03 mit der Drucksubstanz 07 gefüllt werden. Auch der Film der Drucksubstanz 07 ist in den Fig. 1 und 2 vergrößert dargestellt. Fig. 1 shows in a simplified representation of a printing unit of a printing press with at least one first color carrier 01, the z. B. is formed as a first rotating cylinder 01. Preferably, an absorption layer 03 is applied to a lateral surface 02 of the cylinder 01, wherein the absorption layer 03 is formed over the entire surface smooth or in the form of a regular or irregular structure, wherein the structure z. B. in the form of introduced into the surface of the absorption layer 03 depressions, in particular of very small wells can be designed. The absorption layer 03 has a layer thickness z. B. of less than 20 microns, especially less than 5 microns. She is in the Fig. 1 and 2 for drawing technical reasons for better visibility shown greatly enlarged. A cylinder 01 associated with the first inking unit 04 carries z. B. with at least one inking roller 06 a film of a first printing substance 07 preferably over the entire surface of this cylinder 01, wherein z. B. the wells of the absorption layer 03 are filled with the printing substance 07. The film of the printing substance 07 is in the Fig. 1 and 2 shown enlarged.

Ein Bedruckstoff 08, z. B. ein Bogen 08 oder eine Materialbahn 08, insbesondere eine Papierbahn 08, ist in einem Abstand a von vorzugsweise weniger als 2 mm, insbesondere von weniger als 0,5 mm vor dem ersten Zylinder 01 angeordnet oder wird vorzugsweise mit einer vorzugsweise einer Rotationsgeschwindigkeit v01 des Zylinders 01 angepassten Transportgeschwindigkeit v81 vor dem Zylinder 01 vorbeibewegt. Für die Anordnung des Bedruckstoffs 08 vor dem ersten Zylinder 01 kann in axialer Richtung des Zylinders 01 eine erste Umlenkrolle 09 oder Umlenkwalze 09 vorgesehen sein, die den Bedruckstoff 08 vorzugsweise zum einen in seiner Lage, d. h. insbesondere in seinem Abstand a vor dem Zylinder 01 stabilisiert und den Bedruckstoff 08 andererseits in seiner Transportrichtung vom Zylinder 01 ablenkbar macht, d. h. den Bedruckstoff 08 insbesondere in eine vom Zylinder 01 abgewandte Richtung umlenkt.A printing material 08, z. B. a sheet 08 or a web of material 08, in particular a paper web 08 is arranged at a distance a of preferably less than 2 mm, in particular less than 0.5 mm in front of the first cylinder 01 or is preferably with a preferably a rotational speed v01 the cylinder 01 adapted transport speed v81 before the cylinder 01 moved past. For the arrangement of the printing material 08 in front of the first cylinder 01, a first deflection roller 09 or guide roller 09 can be provided in the axial direction of the cylinder 01, which preferably supports the printing material 08 in its position, ie. H. stabilized in particular at its distance a in front of the cylinder 01 and the printing substrate 08 on the other hand makes it deflectable in its transport direction from the cylinder 01, d. H. the printing material 08 in particular deflects in a direction away from the cylinder 01 direction.

Eine erste Strahlungsquelle 11 mit einer geringen Strahldivergenz, eine sogenannte Punktlichtquelle, z. B. ein Laser 11, insbesondere ein Festkörperlaser 11, z. B. ein Rubinlaser oder ein Neodym-YAG-Laser, emittiert Strahlungsenergie hoher Energiedichte in Form eines ersten Energiestrahles 12 zu der auf dem Zylinder 01 aufgetragenen Drucksubstanz 07, wobei der erste Energiestrahl 12 mit einer Normalen 13 einer Oberfläche 19 der Drucksubstanz 07 einen Winkel α von mehr als 0° und weniger als 90°, vorzugsweise weniger als 45° bildet. Mindestens eine zweite Strahlungsquelle 14 ebenfalls mit einer geringen Strahldivergenz, z. B. wiederum ein Laser 14, insbesondere ein Festkörperlaser 14 emittiert ebenfalls Strahlungsenergie hoher Energiedichte in Form eines zweiten Energiestrahles 16 z. B. zu der auf dem ersten Zylinder 01 aufgetragenen ersten Drucksubstanz 07, wobei der zweite Energiestrahl 16 z. B. ebenfalls mit der Normalen 13 der Oberfläche 19 der ersten Drucksubstanz 07 oder einer Normalen 27 einer Oberfläche 19 einer zweiten Drucksubstanz 26 einen Winkel β von mehr als 0° und weniger als 90°, vorzugsweise weniger als 45° bildet. Die Anordnung der Strahlungsquellen 11; 14 kann derart gewählt sein, dass die zwischen den Normalen 13; 27 und den Energiestrahlen 12; 16 ausgebildeten Winkel α; β zumindest annähernd gleich sind. Auch können die Strahlungsquellen 11; 14 derart ausgebildet sein, dass sie z. B. räumlich eine einzige Strahlungsquelle bilden, die in der Lage ist, zumindest zwei Energiestrahlen 12; 16 zu emittieren, wobei die Energiestrahlen 12; 16 voneinander verschiedene Wellenlängen aufweisen. Beispielsweise lassen sich manche Lasersysteme wahlweise zur Emission von Energiestrahlen 12; 16 unterschiedlicher Wellenlänge anregen. Als Beispiel sind hier frequenzverdoppelte oder frequenzverdreifachte Neodym-YAG-Laser genannt, deren Energiestrahlen 12; 16 die Hälfte oder ein Drittel ihrer natürlichen Wellenlänge von 1064 nm aufweisen. Oder die Strahlungsquellen 11; 14 ergeben sich insofern, dass eine einzige Strahlungsquelle 11;14, z. B. ein Farbstoff-Laser, bei dem vorzugsweise organische Farbstoffe, z. B. Rhodamine, Cumarine oder Oxazine in einem Trägermedium, z. B. einer Trägerflüssigkeit gelöst sind, Strahlungsenergie in einem Spektralbereich von z. B. 60 nm oder mehr emittiert, aus dem mindestens zwei Energiestrahlen 12; 16 unterschiedlicher Wellenlänge vorzugsweise durch optische Vorrichtungen, z. B. durch Filter separierbar sind. Die Strahlungsquellen 11; 14 emittieren ihre Strahlungsenergie z. B. kontinuierlich, vorzugsweise aber in Impulsen kurzer Dauer, z. B. in Impulsen von deutlich weniger als 1 µs, insbesondere von etwa 100 ns, dafür aber mit einer hohen Impulswiederholfrequenz von z. B. 1 MHz oder mehr. Eine Intensität der von den Strahlungsquellen 11; 14 emittieren Strahlungsenergie kann z. B. durch die Dauer der Impulse oder durch deren Amplitude eingestellt werden.A first radiation source 11 with a low beam divergence, a so-called point light source, z. B. a laser 11, in particular a solid-state laser 11, z. B. a Ruby laser or a neodymium-YAG laser emits radiant energy of high energy density in the form of a first energy beam 12 to the printing substance 07 applied to the cylinder 01, wherein the first energy beam 12 with a normal 13 of a surface 19 of the printing substance 07 an angle α of more than 0 ° and less than 90 °, preferably less than 45 ° forms. At least one second radiation source 14 also with a low beam divergence, z. B. again a laser 14, in particular a solid-state laser 14 also emits radiant energy high energy density in the form of a second energy beam 16 z. B. to the first cylinder 01 applied on the first printing substance 07, wherein the second energy beam 16 z. B. also with the normal 13 of the surface 19 of the first printing substance 07 or a normal 27 of a surface 19 of a second printing substance 26 forms an angle β of more than 0 ° and less than 90 °, preferably less than 45 °. The arrangement of the radiation sources 11; 14 may be chosen such that the between the normals 13; 27 and the energy beams 12; 16 trained angle α; β are at least approximately equal. Also, the radiation sources 11; 14 be designed such that they z. B. spatially form a single radiation source which is capable of at least two energy beams 12; 16 to emit, the energy beams 12; 16 have different wavelengths. For example, some laser systems can optionally be used to emit energy beams 12; Stimulate 16 different wavelengths. As an example, frequency-doubled or frequency-tripled neodymium-YAG lasers are mentioned here whose energy beams 12; 16 have half or one third of their natural wavelength of 1064 nm. Or the radiation sources 11; 14 result in that a single radiation source 11, 14, z. As a dye laser, in which preferably organic dyes, eg. As rhodamines, coumarins or oxazines in a carrier medium, for. B. a carrier liquid are dissolved, radiation energy in a spectral range of z. B. 60 nm or more, from the at least two energy beams 12; 16 different wavelength preferably by optical devices, eg. B. are separated by filters. The radiation sources 11; 14 emit their radiation energy z. B. continuously, but preferably in pulses of short duration, z. B. in pulses of significantly less than 1 microseconds, in particular of about 100 ns, but with a high pulse repetition frequency of z. 1 MHz or more. An intensity of the radiation sources 11; 14 emit radiation energy can z. B. be adjusted by the duration of the pulses or by their amplitude.

Die auf dem Farbträger 01 aufgetragene Absorptionsschicht 03 absorbiert die von den Strahlungsquellen 11; 14 emittierte Strahlungsenergie und wandelt sie in Wärme oder in einen Impulsübertrag, wodurch gemäß dem bevorzugt angewandten lichthydraulischen Effekt in der Drucksubstanz 07 durch Wärmedehnung oder Verdampfen explosionsartig eine Gasblase ausgebildet wird, die bei ihrem Austritt aus der Drucksubstanz 07 einen Teil 18 der Drucksubstanz 07 in Richtung des von der Drucksubstanz 07 beabstandeten Bedruckstoffes 08 verdrängt und dort einen Druckpunkt setzt. Fig. 2, die eine Ausschnittsvergrößerung der Fig. 1 darstellt, zeigt beispielhaft, wie sich durch den Einfall von Energiestrahlen 12; 16 ein Teil 18 der Drucksubstanz 07, z. B. in Form eines Tropfens 18, aus der vom Zylinder 01 oberflächlich mitgeführten Drucksubstanz 07 löst und zu dem beabstandet angeordneten Bedruckstoff 08 übertragen wird. Die Größe oder Menge des zu dem Bedruckstoff 08 übertragenen Teils 18 der Drucksubstanz 07 ist von der in die Drucksubstanz 07 eingeleiteten Intensität des Energiestrahlens 12; 16 abhängig, weshalb eine mit der Übertragung der Drucksubstanz 07 vorgenommene Flächendeckung des Bedruckstoffes 08 hinsichtlich ihrer optischen Wirksamkeit beeinflussbar ist, d. h. eine Größe und Dichte von auf dem Bedruckstoff 08 durch die Übertragung der Drucksubstanz 07 aufgebrachten Druckpunkten ist über die in die Drucksubstanz 07 eingeleiteten Intensität des Energiestrahlens 12; 16 steuerbar. Auf diese Weise wird die Rastertondichte gesteuert.The applied on the ink carrier 01 absorption layer 03 absorbs the radiation from the sources 11; 14 emitted radiant energy and converts them into heat or in a momentum transfer, which is formed in accordance with the preferred applied light hydraulic effect in the printing substance 07 by thermal expansion or evaporation explosively a gas bubble, on its exit from the printing substance 07 a portion 18 of the printing substance 07 in the direction displaced from the printing substance 07 spaced printing substrate 08 and there sets a pressure point. Fig. 2 , which is an enlarged detail of the Fig. 1 FIG. 2 shows, by way of example, how the incidence of energy beams 12; 16 a part 18 of the printing substance 07, z. B. in the form of a drop 18, from the superficially entrained by the cylinder 01 printing substance 07 dissolves and is transferred to the spaced-apart substrate 08. The size or amount of the transferred to the substrate 08 portion 18 of the printing substance 07 is of the introduced into the printing substance 07 intensity of the energy beam 12; 16, which is why a made with the transfer of the printing substance 07 area coverage of the printing substrate 08 can be influenced in terms of their optical efficiency, ie a size and density of applied to the substrate 08 by the transfer of the printing substance 07 pressure points on the introduced into the printing substance 07 intensity the energy beam 12; 16 controllable. In this way the halftone density is controlled.

In der Druckmaschine ist mindestens ein weiterer, ein zweiter Farbträger 21 vorgesehen, der dem zuvor beschriebenen ersten Farbträger 01 im Aufbau und in seiner Verwendung vorzugsweise im Wesentlichen gleicht, also z. B. als ein zweiter rotierender Zylinder 21 z. B. mit einer Absorptionsschicht 22 ausgebildet ist, wobei auf der Oberfläche des zweiten Zylinders 21, d. h. vorzugsweise auf der Absorptionsschicht 22, mit einem dem zweiten Zylinder 21 zugeordneten zweiten Farbwerk 23 mit z. B. mindestens einer Farbauftragswalze 24 eine zweite Drucksubstanz 26 aufgetragen wird, wobei sich die erste Drucksubstanz 07 und die zweite Drucksubstanz 26 in ihrer stofflichen Beschaffenheit oder in ihrem Spektralverhalten vorzugsweise unterscheiden. So können die verwendeten Drucksubstanzen 07; 26 z. B. als zwei unterschiedliche Druckfarben ausgebildet sein, z. B. die erste Drucksubstanz 07 als eine Buntfarbe und die zweite Drucksubstanz 26 als eine Schwarzfarbe, die für die in der Druckmaschine zur Verfügung stehenden Energiestrahlen 12; 16 ein voneinander verschiedenes Absorptionsvermögen aufweisen. Bei den Drucksubstanzen 07; 26 handelt es sich i. d. R. um eine Dispersion aus einem festen Farbmittel, einem flüssigen Bindemittel und gegebenenfalls einem Druckhilfsmittel, das der Drucksubstanz 07; 26 zugegeben wird, um eine spezielle Eigenschaft der Drucksubstanz 07; 26 zu erzielen, wie z. B. deren Konsistenz, Trocknung, Scheuerfestigkeit oder Glanz, wobei das Farbmittel, z. B. pulverförmige Pigmente in dem Bindemittel, z. B. einem zähfließenden, öligen Firnis feinst verteilt ist. Die Drucksubstanzen 07; 26 sind mithin vorzugsweise von flüssiger oder zumindest fließfähiger Konsistenz.In the printing machine, at least one further, a second color carrier 21 is provided which is preferably substantially similar to the above-described first color carrier 01 in construction and in its use, ie, for. B. as a second rotating cylinder 21 z. B. is formed with an absorption layer 22, wherein on the surface of the second cylinder 21, ie preferably on the absorption layer 22, with a second cylinder 21 associated second inking unit 23 with z. B. at least one inking roller 24, a second printing substance 26 is applied, wherein the first printing substance 07 and the second printing substance 26 preferably differ in their material nature or in their spectral behavior. Thus, the printing substances used 07; 26 z. B. be formed as two different printing inks, z. For example, the first printing substance 07 as a chromatic color and the second printing substance 26 as a black color, which are suitable for the energy beams 12 available in the printing machine; 16 have a different absorption capacity from each other. In the printing substances 07; 26 is usually a dispersion of a solid colorant, a liquid binder and optionally a printing assistant, the printing substance 07; 26 is added to a specific property of the printing substance 07; To achieve 26, such. B. their consistency, drying, abrasion resistance or gloss, wherein the colorant, z. As powdered pigments in the binder, z. B. a viscous, oily varnish is finely distributed. The printing substances 07; 26 are therefore preferably of liquid or at least flowable consistency.

Der Bedruckstoff 08 ist in einem Abstand b von vorzugsweise weniger als 2 mm, insbesondere von weniger als 0,5 mm vor dem zweiten Zylinder 21 angeordnet oder wird mit einer Transportgeschwindigkeit v82, die vorzugsweise einer Rotationsgeschwindigkeit v21 des zweiten Zylinders 21 angepasst ist, vor dem zweiten Zylinder 21 vorbeibewegt. Die Rotationsgeschwindigkeit v21 des zweiten Zylinders 21 und die Transportgeschwindigkeit v82 des Bedruckstoffes 08 nahe am zweiten Zylinder 21 können von der Rotationsgeschwindigkeit v01 des ersten Zylinders 01 und der Transportgeschwindigkeit v81 des Bedruckstoffes 08 nahe am ersten Zylinder 01 abweichen.The printing material 08 is arranged at a distance b of preferably less than 2 mm, in particular less than 0.5 mm in front of the second cylinder 21 or is at a transport speed v82, which is preferably adapted to a rotational speed v21 of the second cylinder 21, before the second cylinder 21 passed. The rotational speed v21 of the second cylinder 21 and the transport speed v82 of the printing material 08 close to the second cylinder 21 may deviate from the rotational speed v01 of the first cylinder 01 and the transport speed v81 of the printing substrate 08 close to the first cylinder 01.

Für die Anordnung des Bedruckstoffes 08 vor dem zweiten Zylinder 21 kann in axialer Richtung dieses Zylinders 21 eine zweite Umlenkrolle 29 oder Umlenkwalze 29 vorgesehen sein, die den Bedruckstoff 08 zum einen in seiner Lage, d. h. insbesondere in seinem Abstand b vor dem zweiten Zylinder 21 stabilisiert und den Bedruckstoff 08 andererseits in seiner Transportrichtung vom zweiten Zylinder 21 ablenkbar macht, d. h. den Bedruckstoff 08 insbesondere in eine vom zweiten Zylinder 21 abgewandte Richtung umlenkt. In einer bevorzugten Ausführung wird der als eine zusammenhängende Materialbahn 08 ausgebildete Bedruckstoff 08 z. B. mittels einer Anordnung dritter Umlenkrollen 31 oder Umlenkwalzen 31 vom ersten Zylinder 01 zum zweiten Zylinder 21 geleitet.For the arrangement of the printing material 08 in front of the second cylinder 21 may be provided in the axial direction of this cylinder 21, a second guide roller 29 or guide roller 29, the printing material 08 on the one hand in its position, d. H. stabilized in particular at its distance b in front of the second cylinder 21 and the printing substrate 08 on the other hand makes it deflectable in the transport direction of the second cylinder 21, d. H. the printing material 08 in particular deflects in a direction away from the second cylinder 21 direction. In a preferred embodiment, the printing material 08 formed as a coherent material web 08 is z. B. by means of an arrangement of third pulleys 31 or guide rollers 31 passed from the first cylinder 01 to the second cylinder 21.

Die Druckmaschine kann je nach Bedarf in entsprechender Weise um weitere Farbträger und Strahlungsquellen erweitert werden, was aber in den Figuren zur Wahrung der Übersichtlichkeit nicht näher dargestellt ist. Auf diese Weise wird die Druckmaschine zu einer Mehrfarbendruckmaschine aufgerüstet, die in der Lage ist, z. B. die üblichen vier Grundfarben Schwarz, Cyan, Magenta und Gelb sowie gegebenenfalls weitere Schmuckfarben und Sonderfarben im gleichen Druckprozess zu verdrucken, wobei sich diese Drucksubstanzen ersichtlichermaßen in ihrer stofflichen Beschaffenheit und in ihrem Spektralverhalten unterscheiden.The printing press can be expanded as required by further color carrier and radiation sources, but this is not shown in detail in the figures for the sake of clarity. In this way, the printing press is upgraded to a multi-color printing machine, which is able, for. Example, the usual four primary colors black, cyan, magenta and yellow and optionally other spot colors and special colors in the same printing process to print, with these printing substances clearly differ in their material properties and in their spectral behavior.

Die Energiestrahlen 12; 16, vorzugsweise solche unterschiedlicher Wellenlänge, können auf denselben, z. B. auf den ersten Farbträger 01 gerichtet sein. Diese Option gestattet es, auf demselben Farbträger 01 Drucksubstanzen 07 z. B. derselben Farbe, aber dennoch unterschiedlicher stofflicher Beschaffenheit zu verdrucken, wobei die unterschiedliche stoffliche Beschaffenheit z. B. durch unterschiedliche Rezepturen der Drucksubstanzen 07 bedingt sein kann. Eine alternative Anordnung sieht vor, dass mindestens ein Energiestrahl 12; 16 auf einen anderen zweiten Farbträger 21 gerichtet ist oder wahlweise zumindest richtbar ist. Auch können Anordnungen vorgesehen werden, bei denen z. B. auf drei Farbträger 01; 21, vorzugsweise auf die Farbträger 01 mit Buntfarben, ein erster Energiestrahl 12 mit einer ersten Wellenlänge gerichtet ist, wohingegen auf den Farbträger 21 mit der Schwarzfarbe im laufenden Druckprozess quasi zur selben Zeit ein zweiter Energiestrahl 16 mit einer zweiten Wellenlänge gerichtet ist, wobei sich die Wellenlängen der Energiestrahlen 12; 16 vorzugsweise voneinander unterscheiden. Auch kann auf jeden Farbträger 01; 21 ein Energiestrahl 12; 16 mit der für die auf dem jeweiligen Farbträger 01; 21 aufgetragenen Drucksubstanz 07; 26 optimalen Wellenlänge gerichtet sein, wobei sich die Energiestrahlen 12; 16 in ihrer jeweiligen Wellenlänge entsprechend der stofflichen Beschaffenheit und/oder dem Spektralverhalten der jeweiligen Drucksubstanz 07; 26 voneinander unterscheiden. So kann entsprechend der stofflichen Beschaffenheit und/oder dem Spektralverhalten der jeweiligen Drucksubstanz 07; 26 für jeden Farbträger 01; 21 ein Energiestrahl 12; 16 mit einer für die Übertragung der jeweiligen Drucksubstanz 07; 26 optimalen Wellenlänge gewählt und eingestellt werden.The energy beams 12; 16, preferably those of different wavelengths, on the same, z. B. be directed to the first color carrier 01. This option allows, on the same color carrier 01 printing substances 07 z. B. the same color, but still different material quality to be printed, the different physical condition z. B. may be due to different formulations of the printing substances 07. An alternative arrangement provides that at least one energy beam 12; 16 is directed to another second color carrier 21 or optionally is at least directable. Also, arrangements may be provided in which z. B. on three color carrier 01; 21, preferably on the color carrier 01 with Bright colors, a first energy beam 12 is directed at a first wavelength, whereas on the color carrier 21 with the black color in the current printing process, a second energy beam 16 with a second wavelength is directed at almost the same time, the wavelengths of the energy beams 12; 16 preferably differ from each other. Also, on each color carrier 01; 21, an energy beam 12; 16 with the on the respective color carrier 01; 21 applied printing substance 07; Be directed 26 optimal wavelength, wherein the energy beams 12; 16 in their respective wavelength according to the material nature and / or the spectral behavior of the respective printing substance 07; 26 different from each other. Thus, according to the material nature and / or the spectral behavior of the respective printing substance 07; 26 for each color carrier 01; 21, an energy beam 12; 16 with a for the transmission of the respective printing substance 07; 26 optimal wavelength can be selected and set.

Beispielsweise könnte auf einen Farbträger 01; 21 mit der Buntfarbe Magenta ein frequenzverdoppelter Neodym-YAG-Laser mit einer im grünen Spektralbereich liegenden Wellenlänge von 532 nm, auf einen Farbträger 01; 21 mit der Buntfarbe Cyan ein Rubinlaser mit einer im roten Spektralbereich liegenden Wellenlänge von 694 nm und auf einen Farbträger 01; 21 mit der Buntfarbe Yellow (Gelb) ein GaN-Halbleiterlaser mit einer im violett-blauen Spektralbereich liegenden Wellenlänge von 395 nm bis 440 nm gerichtet sein. Die Übertragung der jeweiligen Drucksubstanz 07; 26 ist dann optimal, wenn die Absorption des eingestrahlten Energiestrahl 12; 16 ihren höchsten Wirkungsgrad aufweist, was dann der Fall ist, wenn ein Energiestrahl 12; 16 mit einer Wellenlänge eines zur Drucksubstanz 07; 26 komplementären Spektralbereichs verwendet wird. Für einen Farbträger 01; 21 mit der Schwarzfarbe können prinzipiell Energiestrahlen 12; 16 beliebiger Wellenlänge verwendet werden, jedoch eignet sich ein in seiner Grundfrequenz betriebener Neodym-YAG-Laser mit einer im Infrarotbereich liegenden Wellenlänge von 1064 nm besonders gut.For example, could on a color carrier 01; 21 with the color magenta a frequency-doubled neodymium YAG laser with a lying in the green spectral range wavelength of 532 nm, on a color carrier 01; 21 with the cyan color a ruby laser with a wavelength in the red spectral range of 694 nm and on a color carrier 01; 21 with the chromatic yellow (yellow) a GaN semiconductor laser with a lying in the violet-blue spectral wavelength of 395 nm to 440 nm. The transfer of the respective printing substance 07; 26 is optimal when the absorption of the incident energy beam 12; 16 has its highest efficiency, which is the case when an energy beam 12; 16 with a wavelength of a to the printing substance 07; 26 complementary spectral range is used. For a color carrier 01; 21 with the black color can in principle energy beams 12; 16 of any wavelength can be used, however, is in its fundamental frequency operated neodymium-YAG laser with a lying in the infrared range wavelength of 1064 nm is particularly well.

Für ein und dieselbe Druckmaschine können demnach auch mehrere parallel aktivierbare Strahlungsquellen 11; 14 unterschiedlicher Bauart oder mit Energiestrahlen 12; 16 unterschiedlicher Wellenlänge vorgesehen sein, sodass sich bezüglich der Strahlungsquellen 11; 14 und eventuell auch ihrer Anordnung in der Druckmaschine eine Lösung ergibt, bei der bedarfsgerecht selektiv für jeden Farbträger 01; 21 und jede Drucksubstanz 07; 26 die optimale Strahlungsquelle 11; 14 bzw. der Energiestrahl 12; 16 mit der zum Verdrucken der Drucksubstanz 07; 26 optimalen Wellenlänge, Impulsdauer oder Strahlungsenergiemenge zum Einsatz gebracht werden kann. So können z. B. vier Farbträger 01; 21 vorgesehen sein, wobei jeweils ein Energiestrahl 12; 16 auf jeden der Farbträger 01; 21 gerichtet ist, wobei der Energiestrahl 12; 16 bei drei Farbträgern 01; 21 jeweils unter demselben Winkel β von vorzugsweise weniger als 45° auf der Oberfläche 19 der Drucksubstanz 26 auftrifft, während z. B. der auf den vierten Farbträger 01 gerichtete Energiestrahl 12 mit der Übertragungsrichtung der Drucksubstanz 07 zum Bedruckstoff 08 gleichgerichtet ist. Bei einer Anordnung, bei der jeder der vier Farbträger 01; 21 jeweils als ein Zylinder 01; 21 ausgebildet ist, kann somit bei drei Farbträgern 01; 21 der Energiestrahl 12; 16 von außen auf den Zylinder 01; 21 gerichtet sein, wohingegen beim vierten Farbträger 01 der zugehörige Energiestrahl 12 vom Inneren des Zylinders 01 zur Drucksubstanz 07 gerichtet ist. Bei diesem vierten Farbträger 01 kann die den Energiestrahl 12 emittierende Strahlungsquelle 11 z. B. im Inneren des Zylinders 01 angeordnet sein oder aber der Energiestrahl 12 wird von der außerhalb des Zylinders 01 angeordneten Strahlungsquelle 11 durch optische Mittel in das Innere des Zylinders 01 gelenkt und von dort z. B. mittels Spiegel zur Drucksubstanz 07 gerichtet.Accordingly, it is also possible for a single printing machine to have a plurality of radiation sources 11; 14 of different types or with energy beams 12; Be provided 16 different wavelength, so that with respect to the radiation sources 11; 14 and possibly also their arrangement in the printing press results in a solution in the demand selectively for each color carrier 01; 21 and each printing substance 07; 26 the optimal radiation source 11; 14 and the energy beam 12; 16 with the for printing the printing substance 07; 26 optimal wavelength, pulse duration or amount of radiation energy can be used. So z. B. four color carrier 01; Be provided 21, wherein in each case an energy beam 12; 16 on each of the color carrier 01; 21, wherein the energy beam 12; 16 with three color carriers 01; 21 each at the same angle β of preferably less than 45 ° incident on the surface 19 of the printing substance 26, while z. B. the directed onto the fourth ink carrier 01 energy beam 12 is rectified with the transfer direction of the printing substance 07 to the substrate 08. In an arrangement in which each of the four color carriers 01; 21 each as a cylinder 01; 21 is formed, can thus at three color carriers 01; 21, the energy beam 12; 16 from the outside on the cylinder 01; 21 be directed, whereas in the fourth color carrier 01 of the associated energy beam 12 is directed from the interior of the cylinder 01 to the printing substance 07. In this fourth color carrier 01, the energy beam 12 emitting radiation source 11 z. B. be arranged inside the cylinder 01 or the energy beam 12 is directed by the outside of the cylinder 01 arranged radiation source 11 by optical means in the interior of the cylinder 01 and from there z. B. directed by means of mirror to the printing substance 07.

Vorteilhafterweise werden die Energiestrahlen 12; 16 auf eine Auftreffstelle 17 auf der dem Bedruckstoff 08 zugewandten Oberfläche 19 der auf den Farbträgern 01; 21 aufgetragenen Drucksubstanzen 07; 26 fokussiert, wobei der Fokus an der Auftreffstelle 17 einen Durchmesser von weniger als 30 µm, vorzugsweise von weniger als 20 µm aufweist. Es können Mittel, insbesondere optische Vorrichtungen, z. B. ein Polygonspiegel (in den Figuren nicht dargestellt), vorgesehen sein, die die Energiestrahlen 12; 16 vorzugsweise in axialer Richtung der Farbträger 01; 21 auslenken, sodass mit der Auslenkung der Energiestrahlen 12; 16 eine zeilenweise Bedruckung des Bedruckstoffes 08 erfolgt.Advantageously, the energy beams 12; 16 on a point of impact 17 on the substrate 08 facing surface 19 of the color carriers 01; 21 applied printing substances 07; 26 focused, wherein the focus at the point of impact 17 has a diameter of less than 30 microns, preferably less than 20 microns. There may be means, in particular optical devices, for. B. a polygon mirror (not shown in the figures), be provided which the energy beams 12; 16 preferably in the axial direction of the ink carrier 01; 21, so that with the deflection of the energy beams 12; 16 a line by line printing of the substrate 08 takes place.

Die Strahlungsquellen 11; 14 sind bezüglich der Druckmaschine vorzugsweise ortsfest angeordnet. Die Lasersysteme sind mit ihren peripheren Aggregaten, z. B. mit den Vorrichtungen zu ihrer Energieversorgung oder Kühlung, vorzugsweise außerhalb der Druckmaschine angeordnet, sie können jedoch auch im Inneren eines als Zylinder 01; 21 ausgebildeten Farbträger 01; 21 angeordnet sein bzw. der Energiestrahl 12; 16 der Strahlungsquellen 11; 14 ist durch optische Mittel in das Innere des als Zylinder 01; 21 ausgebildeten Farbträger 01; 21 geleitet, um von dort zur Drucksubstanz 07; 26 gerichtet zu werden. Die von den Strahlungsquellen 11; 14 emittierten Energiestrahlen 12; 16 können hinsichtlich ihres Strahlengangs veränderbar sein, z. B. durch optische Leitsysteme oder Umlenksysteme an unterschiedliche Stellen der Druckmaschine, insbesondere zu verschiedenen Farbträgern 01; 21 leitbar sein.The radiation sources 11; 14 are preferably arranged stationary with respect to the printing press. The laser systems are with their peripheral aggregates, z. B. with the devices for their power supply or cooling, preferably arranged outside the printing press, but they can also in the interior of a cylinder 01; 21 trained color carrier 01; Be arranged 21 and the energy beam 12; 16 of the radiation sources 11; 14 is by optical means in the interior of the cylinder as 01; 21 trained color carrier 01; 21 passed to from there to the printing substance 07; 26 to be addressed. The of the radiation sources 11; 14 emitted energy beams 12; 16 may be changeable with respect to their beam path, z. B. by optical guidance systems or deflection systems to different locations of the printing press, in particular to different color carriers 01; 21 be conductive.

Ein im Mehrfarbendruck erzeugtes Druckbild ist im Regelfall aus mehreren Farbauszügen, auch Teilfarbenauszüge genannt, aufgebaut, wobei jeder Farbauszug Bildpunkte einer einzelnen Druckfarbe in das gemeinsame Druckbild einbringt, wobei mehrere Farbauszüge übereinander gedruckt werden, sodass die Bildpunkte der am Aufbau des gemeinsamen Druckbildes beteiligten Farbauszüge nebeneinander, zum Teil auch freistehend nebeneinander, und/oder aufeinander zu liegen kommen. Bei diesem drucktechnischen Druckbildaufbau handelt es sich um einen sogenannten autotypischen Farbmischprozess sowohl mit einer subtraktiven Farbmischung durch den Übereinanderdruck der Bildpunkte einzelner Druckfarben als auch mit einer additiven Farbmischung durch eine Integration der Bildpunkte einzelner Druckfarben durch das Auge eines Betrachters. Beim Mehrfarbendruck ist daher vorgesehen, dass die Farbträger 01; 21 der Druckmaschine sequentiell zumindest einen Teil des gemeinsamen, aus mehreren Farbauszügen aufgebauten Druckbildes auf den Bedruckstoff 08 drucken, wobei die Druckmaschine in einem laufenden Druckprozess in der Regel eine Vielzahl von gleichartigen Druckbildern aufeinander folgend auf den durch die Druckmaschine transportierten Bedruckstoff 08 druckt. Die Qualität des mehrfarbigen Druckbildes wird entscheidend davon beeinflusst, wie lagegenau die Bildpunkte der am Aufbau des gemeinsamen Druckbildes beteiligten Farbauszüge zueinander angeordnet sind. Diese Lagegenauigkeit der miteinander korrelierenden Bildpunkte aus verschiedenen Farbauszügen wird auch als Passer oder als das Farbregister bezeichnet. Bei aufeinander folgend erzeugten, gleichartigen Druckbildern ist sicherzustellen, dass der Passer bzw. das Farbregister möglichst für alle im laufenden Druckprozess erzeugten Druckbilder innerhalb festgelegter, zulässiger Toleranzgrenzen bleibt. Auf die Einhaltung der Toleranzgrenzen wird erfindungsgemäß durch steuerungstechnische oder regelungstechnische Maßnahmen hingewirkt. Die einzuhaltene Lagegenauigkeit der miteinander korrelierenden Bildpunkte aus verschiedenen Farbauszügen liegt im Bereich weniger 1/100 mm.A printed image produced in multicolor printing is usually composed of a plurality of color separations, also called partial color separations, wherein each color separation brings pixels of a single ink into the common print image, whereby several color separations are printed one above the other, so that the pixels of the color separations involved in the construction of the common print image side by side , sometimes also freestanding next to each other, and / or come to rest on each other. In this print-technical print image structure is a so-called autotypical color mixing process both with a subtractive color mixing by the overprinting of the pixels of individual printing inks and with an additive color mixing by integrating the pixels of individual printing inks through the eye of a viewer. When multi-color printing is therefore provided that the color carrier 01; 21 of the printing machine sequentially print at least a portion of the common, composed of several color separations print image on the substrate 08, wherein the printing press in a running printing process usually a plurality of similar printed images successively on the transported by the printing press substrate 08 prints. The quality of the multicolored print image is decisively influenced by how precisely positioned the pixels of the color separations involved in the construction of the common print image are arranged relative to each other. This positional accuracy of the correlated pixels from different color separations is also referred to as a passer or as the color register. In the case of consecutively generated, identical print images, it must be ensured that the register or the color register remains within specified, permissible tolerance limits as far as possible for all print images generated in the current printing process. On the observance of the tolerance limits is acted upon according to the invention by control engineering or control engineering measures. The positional accuracy of the correlated pixels from different color separations is in the range of less than 1/100 mm.

Deshalb ist für die beschriebene Druckmaschine eine vorzugsweise elektronische, z. B. in einem Leitstand der Druckmaschine integrierte Steuereinrichtung 28 vorgesehen, wobei die Steuereinrichtung 28 Peripheriegeräte (nicht dargestellt) wie eine Eingabeeinheit, z. B. eine Tastatur, und/oder eine Ausgabeeinheit, z. B. einen Monitor, aufweisen und für den Empfang und die Weitergabe von Daten an ein Datennetz angeschlossen sein kann.Therefore, for the printing machine described a preferably electronic, z. B. in a control station of the printing machine integrated controller 28 is provided, wherein the controller 28 peripheral devices (not shown) as an input unit, for. As a keyboard, and / or an output unit, for. As a monitor, and may be connected for the reception and transfer of data to a data network.

Die Steuereinrichtung 28 entsendet z. B. durch eine entsprechende Ansteuerung der Strahlungsquellen 11; 14 die auf den zweiten Farbträger 21 zu richtende Strahlungsenergie zeitlich versetzt zu der auf den ersten Farbträger 01 gerichteten Strahlungsenergie, wobei der zeitliche Versatz den sequentiellen Druck der zu demselben Druckbild gehörenden Farbauszüge miteinander synchronisiert, d. h. lagegenau zur Deckung bringt, sodass die Bildpunkte in jedem Farbauszug für das gemeinsame Druckbild in der gewünschten Weise miteinander korrelieren. Ein derartiger zeitlicher Versatz kann auch zwischen weiteren zur Druckmaschine gehörenden Farbträgern 01; 21 bestehen, wobei der zeitliche Versatz jeweils auf den im sequentiellen Druck ersten Farbträger 01 oder der zeitliche Versatz des zweiten Farbträgers 21 stets auf den ihm unmittelbar vorangegangenen Farbträger 01 bezogen sein kann. Der zeitliche Versatz entspricht z. B. einer Transportdauer des Bedruckstoffes 08 zwischen den Orten der Übertragung der Drucksubstanz 07; 26 der Farbträger 01; 21.The controller 28 sends z. B. by a corresponding control of the radiation sources 11; The radiation energy to be directed onto the second color carrier 21 is offset in time from the radiation energy directed onto the first color carrier 01, wherein the time offset synchronizes the sequential pressure of the color separations associated with the same print image, ie coincides precisely so that the pixels in each color separation for the common image in the desired manner correlate. Such a temporal offset can also be between other belonging to the printing press color carriers 01; 21 The temporal offset can always be based on the first ink carrier 01 in the sequential printing or the temporal offset of the second ink carrier 21 always on the ink carrier 01 immediately preceding it. The time offset corresponds to z. B. a transport time of the printing material 08 between the locations of the transfer of the printing substance 07; 26, the color carrier 01; 21st

Wenn mindestens zwei Farbträger 01; 21 der Druckmaschine jeweils als ein rotierender Zylinder 01; 21 ausgebildet sind, wobei die Zylinder 01; 21 jeweils einen von der Steuereinrichtung 28 unabhängig voneinander gesteuerten Antrieb 32; 33 aufweisen, kann die Steuereinrichtung 28 die Zylinder 01; 21 hinsichtlich ihrer Winkellage derart steuern, dass die mit der auf den zweiten Farbträger 21 zu richtenden Strahlungsenergie korrespondierenden Winkellage des den zweiten Farbträger 21 bildenden Zylinders 21 zu der mit der auf den ersten Farbträger 01 gerichteten Strahlungsenergie korrespondierenden Winkellage des den ersten Farbträger 01 bildenden Zylinders 01 um einen Winkel versetzt ist, wobei die jeweilige Winkellage der Farbträger 01; 21 jeweils auf einen festen Bezugspunkt bezogen ist, z. B. auf eine mit 0° bezeichnete Winkellage. Die Steuereinrichtung 28 steuert die Zylinder 01; 21 hinsichtlich ihrer Winkellage insbesondere derart, dass der Winkelversatz in Abhängigkeit von der Rotationsgeschwindigkeit v01 des ersten Zylinders 01 und der Rotationsgeschwindigkeit v21 des zweiten Zylinders 21 den sequentiellen Druck der zu demselben Druckbild gehörenden Farbauszüge miteinander synchronisiert. Der Winkelversatz zwischen den Zylindern 01; 21 korrespondiert auf diese Weise z. B. mit der Transportdauer des Bedruckstoffes 08 zwischen den Orten der Übertragung der Drucksubstanz 07; 26 der Farbträger 01; 21.If at least two color carriers 01; 21 of the printing press each as a rotating cylinder 01; 21 are formed, wherein the cylinder 01; 21 each one of the controller 28 independently of each other controlled drive 32; 33, the control device 28, the cylinder 01; 21 with respect to their angular position such that the corresponding with the to be directed to the second color carrier 21 radiation energy angular position of the second color carrier 21 forming cylinder 21 to the corresponding with the directed to the first color carrier 01 radiant energy angular position of the first color carrier 01 forming cylinder 01 is offset by an angle, wherein the respective angular position of the ink carrier 01; 21 is each related to a fixed reference point, z. B. to a designated 0 ° angular position. The controller 28 controls the cylinders 01; 21 with respect to their angular position, in particular such that the angular offset in dependence on the rotational speed v01 of the first cylinder 01 and the rotational speed v21 of the second cylinder 21 synchronizes the sequential pressure of the color separations belonging to the same print image. The angular offset between the cylinders 01; 21 corresponds in this way z. B. with the transport time of the printing material 08 between the locations of the transfer of the printing substance 07; 26, the color carrier 01; 21st

Die Antriebe 32; 33 der Zylinder 01; 21 sind z. B. als elektrische Motore 32; 33 ausgebildet, insbesondere als in ihrer jeweiligen Winkellage durch die Steuereinrichtung 28 steuerbare oder regelbare Motore 32; 33. In der Praxis genügt es häufig, die Motore 32; 33 zu steuern. Sofern eine Rückkopplung von den Motoren 32; 33 zur Steuereinrichtung 28 besteht, können die Motore 32; 33 insbesondere zum Ausgleich von Störeinflüssen auch geregelt werden. Die genannte Steuereinrichtung 28 kann bei Bedarf auch für die Funktion des Regelns geeignet sein. Vorzugsweise sind alle Farbträger 01; 21 der Druckmaschine jeweils als ein rotierender Zylinder 01; 21 ausgebildet, wobei z. B. alle Zylinder 01; 21 steuerbare oder regelbare Motore 32; 33 aufweisen. Die Antriebe 32; 33 sind z. B. koaxial zur Achse der Zylinder 01; 21 angeordnet und vorzugsweise mit der Achse der Zylinder 01; 21 steif verbunden.The drives 32; 33, the cylinder 01; 21 are z. B. as electric motors 32; 33 formed, in particular as in their respective angular position by the control device 28 controllable or controllable motors 32; 33. In practice, it is often sufficient for the motors 32; 33 to control. Provided a feedback from the motors 32; 33 to Control device 28, the motors 32; 33 are also regulated to compensate for disturbing influences. The said control device 28 may also be suitable for the function of the rules if required. Preferably, all color carrier 01; 21 of the printing press each as a rotating cylinder 01; 21 formed, wherein z. B. all cylinders 01; 21 controllable or controllable motors 32; 33 have. The drives 32; 33 are z. B. coaxial with the axis of the cylinder 01; 21 arranged and preferably with the axis of the cylinder 01; 21 rigidly connected.

Überdies ist in oder an der Druckmaschine auch ein Bildverarbeitungssystem vorgesehen sein, wobei das Bildverarbeitungssystem zumindest einen Teil zumindest eines gedruckten oder zu druckenden Farbauszugs als ein Bild erfasst, wobei die Steuereinrichtung 28 in Abhängigkeit von dem von dem Bildverarbeitungssystem erfassten Bild die auf die Farbträger 01; 21 zu richtende Strahlungsenergie in ihrer Intensität steuert und damit die Rastertondichte zumindest eines Farbauszugs beeinflusst.Moreover, an image processing system is also provided in or on the printing machine, wherein the image processing system captures at least a portion of at least one printed or printed color separation as an image, wherein the controller 28, in response to the image acquired by the image processing system, images the color carriers 01; 21 in directing radiant energy controls in their intensity and thus affects the halftone density at least one color separation.

Es ist vorteilhaft vorzusehen, dass die Steuereinrichtung 28 zur Synchronisation der von den Farbträgern 01; 21 sequentiell gedruckten Farbauszüge desselben Druckbildes Daten aus einer dem Druckprozess vorgelagerten Druckvorstufe erhält. In diesem Fall definieren die Daten aus der Druckvorstufe eine Sollposition hinsichtlich aller, zumindest aber eines der gedruckten oder zu druckenden Farbauszüge. Wenn aus der Druckvorstufe Daten bezüglich der Farbauszüge nicht zur Verfügung stehen, können diese als eine Referenz benötigten Daten auch aus einem Bild oder mehreren Bildern gewonnen werden, wobei das Bild oder die Bilder von einem mit dem zu druckenden Druckbild korrelierenden Referenzdruckbild aufgenommen worden sind.It is advantageous to provide that the control device 28 for the synchronization of the color carriers 01; 21 sequentially printed color separations of the same print image receives data from a pre-press upstream of the printing process. In this case, the data from the prepress define a target position with respect to all, but at least one of the printed or printed color separations. If data relating to the color separations is not available from the pre-press, these data required as a reference can also be obtained from one or more images, the image or images being taken by a reference print image correlating with the print image to be printed.

Die Istposition eines gedruckten oder zu druckenden Farbauszugs wird z. B. mit dem zumindest einen Teil des Druckbildes erfassenden Bildverarbeitungssystem ermittelt. Dazu weist das Bildverarbeitungssystem einen in Transportrichtung des Bedruckstoffes 08 vor dem Farbträger 01; 21 des zu druckenden Farbauszugs und/oder hinter dem Farbträger 01; 21 des gedruckten Farbauszugs angeordneten Bildsensor 34 auf, wobei der Bildsensor 34 z. B. als ein CCD-Chip in einer Kamera, z. B. einer Zeilenkamera oder Flächenkamera, insbesondere einer Farbkamera, ausgebildet ist. In der Fig. 1 sind beide genannten Positionen für den Bildsensor 34 dargestellt, wobei es in der Praxis in der Regel ausreicht, sich für eine dieser beiden Positionen zu entscheiden. Das Bildverarbeitungssystem kann z. B. in der Steuereinrichtung 28 integriert sein, wobei der Bildsensor 34 sein Ausgangssignal zur Steuereinrichtung 28 leitet. Das Bildverarbeitungssystem steuert mit der Steuereinrichtung 28 in Abhängigkeit vom Ausgangssignal des Bildsensors 34 z. B. die Intensität der auf die Farbträger 01; 21 gerichteten Strahlungsenergie. Vorgesehen ist, dass die Steuereinrichtung 28 die Intensität der auf die Farbträger 01; 21 gerichteten Strahlungsenergie durch eine Veränderung der Dauer der Einleitung und/oder einer Amplitude der Strahlungsenergie steuert.The actual position of a printed or printed color separation is z. B. determined with the at least a portion of the print image detecting image processing system. For this purpose, the image processing system in the transport direction of the printing substrate 08 before the ink carrier 01; 21 of the color separation to be printed and / or behind the Color carrier 01; 21 of the printed color separation arranged image sensor 34, wherein the image sensor 34 z. B. as a CCD chip in a camera, z. B. a line camera or area camera, in particular a color camera is formed. In the Fig. 1 Both of these positions are shown for the image sensor 34, wherein in practice it is usually sufficient to decide for one of these two positions. The image processing system may, for. B. in the control device 28, wherein the image sensor 34 conducts its output signal to the control device 28. The image processing system controls with the controller 28 in response to the output signal of the image sensor 34 z. B. the intensity of the on the color carrier 01; 21 directed radiation energy. It is provided that the control device 28, the intensity of the color carrier 01; 21 directed radiation energy by changing the duration of the initiation and / or an amplitude of the radiation energy controls.

Aus den von der Druckvorstufe bereitgestellten Daten oder aus den Daten des Referenzdruckbildes werden vorzugsweise charakteristische und geeignete Ausschnitte ausgewählt, anhand derer die Position der einzelnen aktuell aufgenommenen Farbauszüge zum jeweiligen als Referenz dienenden Teilfarbauszug bestimmt wird. Dieses ist die Sollposition für einen Vergleich mit einem im laufenden Druckprozess aufgenommenen Bild eines zum Druckbild gehörenden Farbauszugs. Die Auswahl der geeigneten Druckbildausschnitte kann manuell durch den Bediener oder automatisch z. B. durch die Steuereinrichtung 28, z. B. für eine Voreinstellung der Sollposition, erfolgen. Geeignete Druckbildausschnitte hinsichtlich des Farbregisters sind Bereiche innerhalb des Druckbildes, in denen die zu vermessende sowie registerhaltig einzustellende Druckfarbe dominiert oder ausschließlich vorkommt.From the data provided by the pre-press or from the data of the reference print image, characteristic and suitable cut-outs are preferably selected, by means of which the position of the individual currently recorded color separations for the respective partial color separation serving as a reference is determined. This is the target position for a comparison with an image taken in the current printing process of a color separation belonging to the printed image. The selection of suitable printed image sections can be done manually by the operator or automatically z. B. by the controller 28, z. B. for a presetting of the desired position, done. Suitable printed image sections with regard to the color register are areas within the printed image in which the ink to be measured as well as to be adjusted in register dominates or exclusively occurs.

Im laufenden Druckprozess, d. h. im Fortdruck, wird mittels des Bildverarbeitungssystems vorzugsweise jedes produzierte Druckbild erfasst und in seine Farbauszüge zerlegt oder im Laufe der Erzeugung eines Druckbildes werden dessen einzelne bereits gedruckte Farbauszüge erfasst. Innerhalb der zuvor festgelegten, geeigneten Druckbildausschnitte wird die Position der einzelnen Farbauszüge bestimmt. Dies geschieht durch Vergleich mit den Farbauszügen aus dem Referenzdruckbild z. B. durch ein Korrelationsverfahren, insbesondere ein Kreuzkorrelationsverfahren. Mittels des Korrelationsverfahrens kann die Position der Farbauszüge sehr genau bestimmt werden. Dieser Vergleich kann für jedes Druckbild zur Erhöhung der Messgenauigkeit auch mehrfach wiederholt werden.In the current printing process, ie in the continuous printing, each printed image produced by the image processing system is preferably detected and decomposed into its color separations or in the course of generating a print image whose individual are already printed Color separations recorded. The position of the individual color separations is determined within the previously defined, suitable printed image sections. This is done by comparison with the color separations from the reference print image z. B. by a correlation method, in particular a cross-correlation method. By means of the correlation method, the position of the color separations can be determined very accurately. This comparison can also be repeated several times for each print image to increase the accuracy of the measurement.

Die Bestimmung der Position der einzelnen Farbauszüge erfolgt in Transportrichtung des Bedruckstoffes 08 und/oder in Querrichtung zur Transportrichtung. Die so erhaltenen Positionsdifferenzen werden von der Steuereinrichtung 28 in Stellbefehle umgewandelt und als Korrektursignale z. B. an die Strahlungsquellen 11; 14 oder an die Antriebe 32; 33 für ihre jeweilige Synchronisation gesendet.The determination of the position of the individual color separations takes place in the transport direction of the printing material 08 and / or in the transverse direction to the transport direction. The position differences thus obtained are converted by the control device 28 into setting commands and used as correction signals z. B. to the radiation sources 11; 14 or to the drives 32; 33 sent for their respective synchronization.

Die Steuereinrichtung 28 entsendet insbesondere dann die auf den zweiten Farbträger 21 zu richtende Strahlungsenergie zeitlich versetzt zu der auf den ersten Farbträger 01 gerichteten Strahlungsenergie, wenn die z. B. mit dem Bildverarbeitungssystem ermittelte Istposition eines gedruckten oder zu druckenden Farbauszugs von seiner Sollposition um mehr als einen zulässigen Toleranzwert abweicht. Gleichfalls steuert die Steuereinrichtung 28 die Zylinder 01; 21 hinsichtlich ihrer Winkellage dann derart, dass die mit der auf den zweiten Farbträger 21 zu richtenden Strahlungsenergie korrespondierenden Winkellage des zweiten Zylinders 21 zu der mit der auf den ersten Farbträger 01 gerichteten Strahlungsenergie korrespondierenden Winkellage des ersten Zylinders 01 um einen Winkel versetzt ist, wenn die z. B. mit dem Bildverarbeitungssystem ermittelte Istposition eines gedruckten oder zu druckenden Farbauszugs von seiner Sollposition um mehr als einen zulässigen Toleranzwert abweicht. Die im Bereich von höchstens wenigen 1/100 mm liegenden zulässigen Toleranzwerte für die Lagegenauigkeit können z. B. an der Steuereinrichtung 28 voreingestellt und bei Bedarf verändert werden.In particular, the control device 28 then sends the radiation energy to be directed onto the second color carrier 21 offset in time from the radiation energy directed onto the first color carrier 01 when the z. B. deviates with the image processing system detected actual position of a printed or printed color separation from its desired position by more than an allowable tolerance value. Likewise, the controller 28 controls the cylinders 01; 21 with respect to their angular position then such that the angular position of the second cylinder 21 corresponding to the radiation energy to be directed to the second color carrier 21 is offset by an angle to the angular position of the first cylinder 01 corresponding to the radiation energy directed to the first color carrier 01, if the z. B. deviates with the image processing system detected actual position of a printed or printed color separation from its desired position by more than an allowable tolerance value. The permissible tolerance values for the positional accuracy lying in the range of at most a few 1/100 mm can, for. B. preset to the controller 28 and changed if necessary.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

0101
Farbträger, erster; ZylinderColor carrier, first; cylinder
0202
Mantelflächelateral surface
0303
Absorptionsschichtabsorbing layer
0404
Farbwerk, erstesInking unit, first
0505
--
0606
FarbauftragswalzeInking roller
0707
Drucksubstanz, erstePrinting substance, first
0808
Bedruckstoff; Bogen; Materialbahn; Papierbahnprinting material; Bow; Web; paper web
0909
Umlenkrolle, erste; UmlenkwalzePulley, first; deflecting
1010
--
1111
Strahlungsquelle, erste; Laser; FestkörperlaserRadiation source, first; Laser; Solid-state lasers
1212
Energiestrahl, ersterEnergy beam, first
1313
Normalenormal
1414
Strahlungsquelle, zweite; Laser; FestkörperlaserRadiation source, second; Laser; Solid-state lasers
1515
--
1616
Energiestrahl, zweiterEnergy beam, second
1717
Auftreffstelleimpingement
1818
Teil der Drucksubstanz; TropfenPart of the printing substance; drops
1919
Oberfläche der DrucksubstanzSurface of the printing substance
2020
--
2121
Farbträger, zweiter; ZylinderColor carrier, second; cylinder
2222
Absorptionsschichtabsorbing layer
2323
Farbwerk, zweitesInking unit, second
2424
Farbauftragswalze, WalzePaint roller, roller
2525
--
2626
Drucksubstanz, zweitePrinting substance, second
2727
Normalenormal
2828
Steuereinrichtungcontrol device
2929
Umlenkrolle, zweite; UmlenkwalzePulley, second; deflecting
3030
--
3131
Umlenkrolle, dritte; UmlenkwalzePulley, third; deflecting
3232
Antrieb, MotorDrive, engine
3333
Antrieb, MotorDrive, engine
3434
Bildsensorimage sensor
aa
Abstanddistance
bb
Abstanddistance
αα
Winkelangle
ββ
Winkelangle
v01v01
Rotationsgeschwindigkeit (01)Rotation speed (01)
v81v81
Transportgeschwindigkeittransport speed
v21v21
Rotationsgeschwindigkeit (21)Rotational speed (21)
v82v82
Transportgeschwindigkeittransport speed

Claims (23)

  1. Printer having at least two ink carriers (01; 21) each carrying a printing substance (07; 26), each ink carrier (01; 21) being assigned a radiation source (11; 14) controlled by a control device (28), each radiation source (11; 14) sending out radiated energy to at least one of the ink carriers (01; 21), radiated energy received by one of the ink carriers (01; 21) influencing a transfer of at least some (18) of the printing substance (07; 26) from this ink carrier (01; 21) to a printing material (08) arranged at a distance from this ink carrier (01; 21), the ink carriers (01; 21) being arranged following one another in the transport direction of the printing material (08), the ink carriers (01; 21) sequentially printing at least part of a common printing image built up from a plurality of colour separations onto the printing material (08), characterized in that an image processing system acquires at least part of at least one printed colour separation as an image, the image processing system determining the actual position of at least this one printed colour separation, the control device (28) introducing the radiated energy to be directed towards the ink carriers (01; 21) one after another with a time offset if the determined actual position of the one printed colour separation deviates from its intended position by more than a permissible tolerance value, the control device (28) controlling at least one radiation source (11; 14) with regard to the intensity of the radiated energy to be introduced into the ink carrier (01; 21) associated with it as a function of the image acquired by the image processing system, the control device (28) controlling the intensity of the radiated energy directed towards the relevant ink carrier (01; 21) by changing the duration of the introduction and/or an amplitude of the radiated energy.
  2. Printer according to Claim 1, characterized in that at least two ink carriers (01; 21) are in each case constructed as a rotating cylinder (01; 21).
  3. Printer according to Claim 2, characterized in that at least two cylinders (01; 21) in each case have a drive (32; 33) controlled independently of each other by the control device (28).
  4. Printer according to Claim 3, characterized in that the control device (28) controls the radiation sources (11; 14) of the cylinders (01; 21) printing the different colour separations of the same printing image as a function of the respective angular position of these cylinders (01; 21).
  5. Printer according to Claim 4, characterized in that the control device (28) controls the radiation sources (11; 14) of the cylinders (01; 21) printing the different colour separations of the same printing image as a function of the respective speed of rotation (v01; v21) of these cylinders (01; 21).
  6. Printer according to Claim 1, characterized in that the control device (28) controls the radiation sources (11; 14) of the ink carriers (01; 21) printing the different colour separations of the same printing image as a function of the duration of the transport of the printing material (08) between the locations of the transfer of the printing substance (07; 26) of these ink carriers (01; 21).
  7. Printer according to Claim 6, characterized in that the control device (28) synchronizes with one another the sequential printing of colour separations belonging to the same printing image by controlling the radiation sources (11; 14).
  8. Printer according to Claim 1, characterized in that, for the purpose of synchronizing the ink carriers (01; 21) printing the colour separations of the same printing image arranged following one another, the control device (28) receives data from a prepress stage.
  9. Printer according to Claim 8, characterized in that the data from the prepress stage defines the intended position of at least one of the colour separations that has been printed or is to be printed.
  10. Printer according to Claim 4, characterized in that the control device (28) controls the radiation sources (11; 14) of the cylinders (01; 21) printing the different colour separations of the same printing image as a function of the respective angular position of these cylinders (01; 21) if the determined actual position of a printed colour separation deviates from its intended position by more than a permissible tolerance value.
  11. Printer according to Claim 1, characterized in that all the ink carriers (01; 21) are in each case constructed as a rotating cylinder (01; 21).
  12. Printer according to Claim 3, characterized in that the drives (32; 33) are constructed as an electrically controlled motor.
  13. Printer according to Claim 3, characterized in that the drives (32; 33) are arranged coaxially with the shafts of the cylinders (01; 21).
  14. Printer according to Claim 3, characterized in that the drives (32; 33) are connected rigidly to the shaft of the cylinders (01; 21).
  15. Printer according to Claim 1, characterized in that the ink carriers (01; 21) in each case have an absorption layer (03; 22).
  16. Printer according to Claim 15, characterized in that the absorption layer (03; 22) has an entirely smooth surface.
  17. Printer according to Claim 15, characterized in that the absorption layer (03; 22) has a surface with a regular or irregular structure.
  18. Printer according to Claim 17, characterized in that the structure is formed from cells holding printing substance (07; 26).
  19. Printer according to Claim 1, characterized in that the same radiation source (14) sends out radiated energy to at least two mutually different ink carriers (01; 21).
  20. Printer according to Claim 1, characterized in that the printing substance (07; 26) in each case applied to the ink carriers (01; 21) has a liquid binder for its colorant.
  21. Printer according to Claim 1, characterized in that, by using each radiation source (11; 14), radiated energy can be introduced into the printing substance (07; 26) applied to the ink carrier (01; 21) associated with the respective radiation source (11; 14), radiated energy introduced into a printing substance (07; 26) exciting at least part (18) of this printing substance (07; 26) to transfer to a printing material (08) arranged at a distance from the ink carrier (01; 21) carrying this printing substance (07; 26).
  22. Printer according to Claim 21, characterized in that radiated energy introduced into printing substance (07; 26) excites at least part (18) of this printing substance (07; 26) to transfer to the printing material (08) arranged at a distance from the ink carrier (01; 21) carrying this printing substance (07; 26), by utilizing an opto-hydraulic effect.
  23. Printer according to Claim 21, characterized in that the control device (28) controls the intensity of the radiated energy to be introduced by at least one radiation source (11; 14) into the ink carrier (01; 21) associated with the latter.
EP05101653A 2004-05-04 2005-03-03 Printer with at least two color sheets each carrying print substance Not-in-force EP1593513B1 (en)

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DE102004022230 2004-05-04
DE102004022230A DE102004022230A1 (en) 2004-05-04 2004-05-04 Printing machines with a printing substance-carrying ink carrier

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EP1593513A3 EP1593513A3 (en) 2008-03-05
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ATE350220T1 (en) * 2000-03-30 2007-01-15 Aurentum Innovationstechnologi PRINTING METHOD AND PRINTING MACHINE THEREFOR
JP2002086772A (en) * 2000-09-14 2002-03-26 Think Laboratory Co Ltd Transfer printing method with a plurality of colors
EP1384580A1 (en) * 2002-07-27 2004-01-28 serv-o-tec Druck- und Papierverarbeitungsmaschinen GmbH Method and device for setting registers of a printing press
US7415928B2 (en) * 2002-12-06 2008-08-26 Koenig & Bauer Aktiengesellschaft Printing machines with at least one color support

Also Published As

Publication number Publication date
ATE556848T1 (en) 2012-05-15
EP1593513A2 (en) 2005-11-09
EP1593513A3 (en) 2008-03-05
DE102004022230A1 (en) 2005-12-08

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