EP1249346B1 - Device for adjusting the printing image in a flexographic printing machine - Google Patents

Device for adjusting the printing image in a flexographic printing machine Download PDF

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Publication number
EP1249346B1
EP1249346B1 EP02005727A EP02005727A EP1249346B1 EP 1249346 B1 EP1249346 B1 EP 1249346B1 EP 02005727 A EP02005727 A EP 02005727A EP 02005727 A EP02005727 A EP 02005727A EP 1249346 B1 EP1249346 B1 EP 1249346B1
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EP
European Patent Office
Prior art keywords
printed image
printing
rolls
involved
regulating unit
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.)
Expired - Lifetime
Application number
EP02005727A
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German (de)
French (fr)
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EP1249346A1 (en
EP1249346B2 (en
Inventor
Dietmar Pötter
Martin Krümpelmann
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Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Priority to EP05022128A priority Critical patent/EP1666252B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/20—Supports for bearings or supports for forme, offset, or impression cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/26—Arrangement of cylinder bearings
    • B41F13/30—Bearings mounted on sliding supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/30—Heliography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/70—Driving devices associated with particular installations or situations
    • B41P2213/73—Driving devices for multicolour presses
    • B41P2213/734—Driving devices for multicolour presses each printing unit being driven by its own electric motor, i.e. electric shaft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/45—Sensor for ink or dampening fluid thickness or density

Definitions

  • the invention relates to a device and a method according to the preamble of claims 1 and 17. It should be noted that there is a need to adjust the print image by optimizing the relative position of the rollers involved in the inking and printing process in all areas of the rotary printing. Thus, in gravure printing machines, the position of the impression roller is set to the pressure roller. In flexographic printing machines, the impression cylinder, the pressure roller and the anilox roller must be adjusted to each other.
  • flexographic printing machines which with a pressure roller and a Anilox roller are mounted on each at least one console of the Printing press frame are movable. These two rollers can through own actuators both independently and jointly the impression cylinder, on which the printing material is applied, employed become.
  • DE 29 41 521 A1 and DE 37 42 129 A1 show printing presses, bel which the bearing blocks of the pressure cylinder carrying carriage In Slide guides of the inking unit of the printing press frame are guided and provided with their own spindle drives and in which the Chipped the impression cylinder with further slide guides for the Bearing blocks of the inking or anilox rollers carrying carriage provided are, in turn, have their own spindle drives.
  • a flexographic printing machine in which the Pressure roller carrying carriages and the inking or rests rollers carrying carriage in a common carriage guide the Inking unit of the printing press out and together and individually can be moved by Spindetantriebe.
  • the adjustment of the printed image in a known manner can be done as follows.
  • An electronic control device is provided which can access data entered into a memory device. The data relate to the travel between the pressure and the back pressure, taking into account the geometrical dimensions of the machine and the diameter of the rollers.
  • This control device then adjusts the relative roller positions so that it is ensured that all parts of the printed image are transferred.
  • This loading operation is performed by the print engine operator, who adjusts the roll positions while observing the print image.
  • the object of the invention is that, a device or a method of the initially specified type to create an automatic adjustment of the Print image to the desired optimum quality.
  • This object is achieved in a device or a method of the initially specified type achieved in that at least one of the printed image on the Substrate web detecting camera is provided, which successively Recorded images an electronic control device supplies. These Control device evaluates the images of the printed image to the effect that the color transfer is checked for completeness and determined from the images taken the optimal Roller positions and thus controls the positioning motors automatically.
  • the storage unit in the storage unit, the digitized desired form of the printed image is stored. This desired shape is then (optionally in the control device) with the respectively recorded print image compared. The control device generates then as long as for the rollers traversing actuators actuating signals, until the comparison the best match between the recorded Print image and their stored nominal shape results.
  • Another embodiment of the invention does not require a stored in a memory digitized desired form.
  • use is made of the fact that the intensity of the reflected light of different sections of the printed image as a function of the relative roller position has a characteristic course.
  • the intensity of the reflected light does not change unless contact is made between all the rollers involved in the printing or inking process.
  • the contact is made, the ink transfer to the substrate begins and the intensity of the reflected light changes relatively strongly until an optimum color transfer value is achieved.
  • a further approximation of the rollers then leads only to a smaller change in the intensity of the reflected light.
  • an optimum between ink transfer and contact pressure of the rollers is usually achieved against each other.
  • a further mutual approach of the rollers then only builds up pressure, which can lead to damage to the rollers, roller bearings, printing plates, materials to be printed, etc.
  • the use of at least one color camera is recommended, so that light of selected wavelength ranges can be recorded.
  • This measure is suitable both to facilitate the comparison with a stored digitized desired form of the printed image and to carry out the course of the light intensity or the contrast values in an improved form.
  • Commercially available cameras of modern design usually have as photosensitive elements semiconductor devices that are sensitive to light of certain wavelengths, which is due to the photoelectric effect and its applications in the semiconductor field. It is expedient for a camera in this way to be able to assign electrical output values to color intensity values of several colors (eg red, yellow, blue). These values are then made accessible to a control and control unit.
  • the color intensity profile of different colors or even the entire spectrum of a printed image or even the sections of a printed image can be recorded.
  • the measured values are then used in the manner already described in order to set the suitable position of the pressure rollers.
  • Also for the individual colors can be done in the manner already described a contrast formation.
  • Light intensity values can also be converted into coordinate systems suitable for further evaluation. The same naturally applies to the contrast values.
  • These values derived in the last instance from intensity values and color values (wavelength / frequency) also have a characteristic course as a function of the relative position of the rollers and can be used in the manner already described.
  • a digital camera is advantageously used, the provides digital images of the recorded print images.
  • the setting can be made separately for each printing unit respectively.
  • a separate adjustment of the actuators for producing the parallelism of the various rollers may be provided if, due to an inclination of a roller over the length underschledliche Andschreibe arise.
  • flexographic printing would z. B. a separate adjustability of the actuators one side of the inking unit or the inking provide v. a . to ensure the parallelism of pressure and impression cylinder.
  • a measuring process is the observation of the course of the intensity or contrast values, while the welts involved in the printing process are adjusted to one another. If only one camera is used, it is possible to sequentially set several inking units of a machine, that is to perform a measuring operation during the setting of an inking unit.
  • a printing machine frame of which only the side panel 1 schematically 2 and 3, is a drive provided in the usual way Counter-pressure roller 3 stored.
  • the side parts 1, 2 carry a Printing unit console 4, on the guides in not shown, the bearing blocks 5 and 6 of a pressure roller 7 and an anilox roller 8 slidably in the direction the double arrows A and B are performed.
  • the bearing blocks arranged on both sides 5, 6 can be moved by individually controllable servo motors M1 to M4, and although in the catfish that each roller 7, 8 can be moved by itself and both can also be moved together in a fixed position.
  • the printing machine frame 1, 2 is not shown with other Provided inking consoles on which in a similar way printing and Anilox rollers 8 are guided movable, with all printing cylinders only the only counter-pressure roller 3 is provided.
  • the flexographic printing machine according to the invention can in principle of hers mechanical structure ago be designed in the same way as in the DE 29 41 521 A 1, DE 37 42 129 A 1 and DE 40 01 735 A 1 described Flexo presses.
  • the anilox roller 8 is provided with a conventional inking, the preferably consists of a known color camera.
  • the pressure roller 7 is printing on the paper web 17 Kilschees. 9 Mistake. In this case, a diamond pattern, which is easy in the figure is to be represented, imprinted.
  • Pressure roller 7 is the over the counter-pressure roller 3 in the direction of arrows C. and D current paper web 17 printed with a printed image 10, the Simplified in the form of squares.
  • This print 10 is received in the detection area 11 by the camera K, which successively taken pictures via the line 12 with a Computer provided control unit 13 supplies. In the tax and Control unit 13 via a special input device 14 data entered, the diameter of the pressure roller 7 and the thickness of relate to these worn clichés 9.
  • control unit 13 About another input unit 15, for example in the form of on a CD stored data is in the control unit 13, the desired form of entered to be printed image 10.
  • control unit 13 For example, in one embodiment, those from the camera K recorded print images with the input via the input unit 15 Sollform the printed image compared and the control unit 13 is via lines signals to an adjusting device 16 from, corresponding to the from the control unit 13 signals generated the servo motors M1 to M4 of the printing and anilox roller 7, 8 controls.
  • the settings are in one Memory of the control unit stored, so that as needed the optimal position of the printing and anilox rollers 7, 8 found again can be.
  • FIG. 2 it is shown in which manner or sequence the three rollers involved in a flexographic printing machine can be set against one another.
  • a representation of the relative roll position setting is not necessary because only two rolls are involved in gravure printing in the printing process.
  • FIG. 2 is constructed in matrix form. The columns denoted by the capital letters A to C contain practicessbelplete, while the designated by the small letters a to e lines designate process steps of the individual principalsbeipiele.
  • the printing material, which runs during printing between the pressure 7 and counter-pressure roller 6 and which is assigned the reference numeral 17 in Figure 1, is not shown in Figure 2.
  • roller 7, 8 The individual movement of a roller 7, 8 is represented by an arrow within a roller, while an arrow passing through both rollers indicates the mutual movement of the roller packet without a change in the relative position of the rollers relative to one another.
  • overpress is often used. Therefore, it should be noted at this point that by “overpressing” is meant a pitching or pressing of the rollers which goes beyond the exact geometrical dimensions thereof. By this measure, it is ensured that between the "overpressed” rollers or between the substrate, which is printed between over-pressed rollers, and one of these rollers takes place in any case a full-surface ink transfer.
  • the “distance” by which it must be “overdriven” or the pressure that is necessary for this varies from printing process to printing process from millimeter fractions to millimeters. It is clear that in most printing processes flexible rollers, substrates or other flexible additional elements are used, which increase this distance. In this context, the clichés of flexographic printing or gravure impression are mentioned as examples. However, it is also worth noting that cylinders made of steel can usually be overpowered by simple means, which goes beyond the ovality of their mantle surface. This is the case in particular if the cylinders have rubberized lateral surfaces. Therefore, the mentioned overpressing can be used in various printing processes.
  • the line a - as in the other exemplary embodiments - is the starting state in which the three rollers 3, 7, 8 involved are not yet turned against one another.
  • the pressure roller 7 is set against the counter-pressure roller 6 and over-pressed in the manner already described above.
  • the individual movement of the pressure roller 7 is represented by the arrow. This ensures that all zones of the plate (when colored) transfer color to the substrate.
  • the process step A b there is still no contact and thus no ink transfer to the pressure roller 7 and the substrate.
  • the next step c of the embodiment A is in approaching the anilox roller 8 to the platen 7 until all pixels on the substrate can be seen.
  • step A d shows how the two rollers 7 and 8 are moved away from the Gegendurckwalze, wherein the set relative position between the anilox roller B and the pressure roller 7 is maintained.
  • the two rollers are moved back to the counter-pressure roller until all pixels are again present on the Betikuckstoff, which is verified again with the help of the camera.
  • the process is completed, the print image optimized and the actual production process can begin.
  • the line a is the Kirbystend, in which the three rollers involved, 7, 8 are not yet employed against each other.
  • the anilox roller 8 is set against the pressure roller 7 and over-pressed in the manner already described above. This ensures that all zones of the cliché are completely colored.
  • the next step c ofchiefsbeipiels B consists in approaching the package of anilox roller 8 and pressure roller 7 to the platen roller 3 to all pixels on the substrate can be seen. This circumstance is verified in the manner already described with the help of at least one camera. Since a permanent suppression of the set in step b to each other rollers 7 and 8 is undesirable, now carried out the process steps B d and B e.
  • the process step B d shows how the roller 8 is moved away from the pressure roller 7, whereby the set relative position between the pressure roller 7 and the counter-pressure roller 3 is maintained.
  • the two wafers are brought together again until all image elements are present on the printing material, which is verified again with the aid of the camera.
  • the pressure roller 7 and the anilox roller 8 are made common to the counter-pressure roller 3 wherein all three rollers involved 3, 7, 8 are suppressed from each other.
  • the pair of rollers consisting of printing roller 7 and anilox roller 8 are then driven together by the counterpressure roller, whereby the suppression between the rollers of the roller pair remains.
  • the roller pair is adjusted to the counterpressure roller until all image elements are transferred to the printing material.
  • the anilox roller 8 is moved away from the pressure roller, there is at least no complete color transfer instead. The retraction of the anilox roller 8 to the pressure roller 7 shown in the method step C1 f takes place again until the printed image is imaged without loss of area.
  • the embodiment according to FIG. 2C 2 differs in the steps c to e of the embodiment of FIG. 2 C 1 in that in step c the anilox roller 8 from the In overpressed position to the counter-pressure roller. 7 Employed pressure roller from its overpressed position relative to the Pressure roller is moved in the direction of the arrow. Subsequently, the Anilox roller 8 in step d in their optimal employment of the pressure roller brought in steps e and f, the joint departure of Pressure roller and anilox roller from the counterpressure roller and the adjusting by the control unit in a form to the counter-pressure roller, the ensures that the print image is imaged without loss of area.
  • FIG. 3 schematically illustrates the manner in which the printed image 10, which is contained in the rectangle 20, can be decomposed into different sections 18. For illustrative reasons, it was decided not to skizzleren the print image itself. In practice, it is possible to decompose a printed image 10 into thousands of sections 18.
  • FIG. 4 shows the contrast curve k i of the sections 18a and 18b, which is plotted as a function of the position of the rollers relative to each other. The resulting characteristics 19 a and 19 b are assigned to the sections 18 a and 18 b. It immediately becomes clear that both characteristics have largely the same shape. The fact that both characteristics have almost identical maxima. However, due to the fact that the contrast values were normalized in this embodiment.
  • Such standardization may be performed, for example, with respect to average values of multiple sections 18.
  • the course of the two characteristic curves is offset relative to the roll position, since the rolls involved in the printing process, clichés, etc., as already mentioned several tolerances, which in this case cause the portion 18 a "earlier" is completely printed, as the portion 18 b ,
  • the portion 18a is already completely printed when the area 21a of the characteristic 19a is reached.
  • Both sections 19 a, b are printed when the portion 21 b of the curve 18 b is reached Similarly, when the ninth characteristic area 21n is reached, where n is a selected number of image portions, the setting operation of the printing rollers can be terminated.
  • the fact that the regions 21 of the characteristic curves 19 lie behind the second inflection point of the characteristic curves 19 in the exemplary embodiment shown does not mean that this always has to be the case. Rather, the characteristics shown have several areas, the course is so characteristic that an evaluation device can easily recognize when the characteristics 19 has reached a selected number of image sections 18 such a range.
  • the definition of this range is therefore a measure that depends on a number of parameters (print quality to be achieved, substrate, printing process, etc.) and can be performed as needed.
  • the consideration of the characteristics of Figure 4 also facilitates the understanding that all devices and methods of the invention also work when the wheat involved in the printing process are initially suppressed against each other and then traversed the rollers from each other (the mechanical contact will remain).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Image Analysis (AREA)
  • Printing Methods (AREA)

Abstract

The method involves moving a part of rollers (3, 7, 8) by actuating drives (M1-M4) commonly and independent of each other such that the rollers involved in a printing process are engaged with each other. A measuring process is executed by a camera (K), and consecutive intensity values of light are recorded by the camera, where the light is reflected by sections of a print image (10). The intensity values are fed to a control and regulating unit (13), and a signal is produced by the control and regulating unit depending on the measured intensity values for the drives of the part of the rollers. An independent claim is also included for a rotary printing machine comprising a camera for executing a measuring process.

Description

Die Erfindung betrifft eine Vorrichtung und ein Verfahren nach dem Oberbegriff der Ansprüche 1 und 17.
Hierbei ist festzuhalten, dass die Notwendigkeit der Einstellung des Druckbildes durch die Optimierung der Relativposition der am Einfärbe- und Druckprozess beteiligten Walzen in allen Bereichen des Rotationsdrucks besteht. So wird bei Tiefdruckmaschinen die Position des Presseurs zu der Druckwalze eingestellt.
Bei Flexodruckmaschinen müssen der Gegendruckzylinder, die Druckwalze und die Rasterwalze zueinander eingestellt werden.The invention relates to a device and a method according to the preamble of claims 1 and 17.
It should be noted that there is a need to adjust the print image by optimizing the relative position of the rollers involved in the inking and printing process in all areas of the rotary printing. Thus, in gravure printing machines, the position of the impression roller is set to the pressure roller.
In flexographic printing machines, the impression cylinder, the pressure roller and the anilox roller must be adjusted to each other.

Daher sind Flexodruckmaschinen bekannt, die mit einer Druckwalze und einer Rasterwalze ausgestattet sind, die auf jeweils mindestens einer Konsole des Druckmaschinengestells verfahrbar sind. Diese beiden Walzen können durch eigene Stellantriebe sowohl unabhängig voneinander als auch gemeinsam an den Gegendruckzylinder, auf dem die Bedruckstoffbahn anliegt, angestellt werden.Therefore, flexographic printing machines are known, which with a pressure roller and a Anilox roller are mounted on each at least one console of the Printing press frame are movable. These two rollers can through own actuators both independently and jointly the impression cylinder, on which the printing material is applied, employed become.

So zeigen die DE 29 41 521 A1 und DE 37 42 129 A1 Druckmaschinen, bel denen die Lagerböcke der die Druckzylinder tragenden Schlitten In Schlittenführungen der Farbwerkskonsolen des Druckmaschinengestells geführt und mit eigenen Spindelantrieben versehen sind und bei denen die Schiltten der Druckzylinder mit weiteren Schlittenführungen für die die Lagerböcke der Farbauftrags- oder Rasterwalzen tragenden Schlitten versehen sind, die wiederum eigene Spindeltriebe aufweisen.Thus, DE 29 41 521 A1 and DE 37 42 129 A1 show printing presses, bel which the bearing blocks of the pressure cylinder carrying carriage In Slide guides of the inking unit of the printing press frame are guided and provided with their own spindle drives and in which the Chipped the impression cylinder with further slide guides for the Bearing blocks of the inking or anilox rollers carrying carriage provided are, in turn, have their own spindle drives.

Aus DE 40 01 735 A 1 ist eine Flexodruckmaschine bekannt, bei der die die Druckwalze tragenden Schlitten und die die Farbauftrags- oder Resterwalzen tragenden Schlitten in einer gemeinsamen Schlittenführung der Farbwerkskonsolen der Druckmaschine geführt und gemeinsam und einzeln durch Spindetantriebe verfahrbar sind.From DE 40 01 735 A 1, a flexographic printing machine is known in which the Pressure roller carrying carriages and the inking or rests rollers carrying carriage in a common carriage guide the Inking unit of the printing press out and together and individually can be moved by Spindetantriebe.

Bei Rotationsdruckmaschinen dieser bekannten Art kann die Einstellung des Druckbildes in bekannter Weise folgendermaßen erfolgen. Eine elektronische Steuereinrichtung ist vorgesehen, die auf in eine Speichereinrichtung eingegebene Daten zurückgreifen kann. Die Daten betreffen den Stellweg zwischen der Druck- und der Gegendruckweize unter Berücksichtigung der geometrischen Abmessungen der Maschine und der Durchmesser der Walzen. Diese Steuereinrichtung stellt dann die relativen Walzenpositionen ein, so dass gewährleistet sein soJlte, dass sämtliche Teile des Druckbildes übertragen werden.
Allerdings besitzen die verschiedenen Walzen, Druckformen sowie die zu bedruckenden Materialien und alle anderen beteiligten Teile geometrische Toleranzen, so dass oft ein zusätzlicher Beistellvorgang notwendig wird.
Dieser Beistellvorgang erfolgt durch den Druckmaschinenführer, der die Walzenpositionen einstellt, während er das Druckbild beobachtet.
Durch diese Art der Einstellung des Druckbildes Ist sichergestellt, dass mit geringstem Andruck der am Druckprozess beteiligten Walzen gegeneinander ein gutes Druckbild erhalten wird. Diese Art der Einstellung des Druckbildes ist jedoch umständlich, erfordert viel Zeit und Ausschuss und ist auch insofern nachteilig, als sie von der subjektiven Beurteilung des Druckmaschinenführers durch Augenschein abhängt.In rotary printing machines of this known type, the adjustment of the printed image in a known manner can be done as follows. An electronic control device is provided which can access data entered into a memory device. The data relate to the travel between the pressure and the back pressure, taking into account the geometrical dimensions of the machine and the diameter of the rollers. This control device then adjusts the relative roller positions so that it is ensured that all parts of the printed image are transferred.
However, the various rollers, printing plates and the materials to be printed and all other parts involved geometric tolerances, so often an additional Beistellvorgang is necessary.
This loading operation is performed by the print engine operator, who adjusts the roll positions while observing the print image.
By this type of adjustment of the printed image is ensured that with minimal pressure of the rollers involved in the printing process against each other a good print image is obtained. However, this type of adjustment of the printed image is cumbersome, requires a lot of time and waste and is also disadvantageous in that it depends on the subjective assessment of the printing press operator by visual inspection.

Aufgabe der Erfindung ist es dener, eine Vorrichtung bzw ein Verfahren der eingangs angegebenen Art zu schaffen, die eine automatische Einstellung des Druckbildes auf die gewünschte optimale Qualität ermöglichen. The object of the invention is that, a device or a method of the initially specified type to create an automatic adjustment of the Print image to the desired optimum quality.

Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung bzw ein Verfahren der eingangs angegebenen Art dadurch gelöst, dass mindestens eine das Druckbild auf der Bedruckstoffbahn erfassende Kamera vorgesehen ist, die aufeinanderfolgend aufgenommene Bilder einer elektronischen Steuereinrichtung zuführt. Diese Steuereinrichtung wertet die Bilder des Druckbildes dahingehend aus, daß der Farbübertrag auf Vollständigkeit geprüft wird und ermittelt aus den aufgenommenen Bildern die optimalen Walzenpositionen und steuert damit die Positioniermotoren automatisch an.This object is achieved in a device or a method of the initially specified type achieved in that at least one of the printed image on the Substrate web detecting camera is provided, which successively Recorded images an electronic control device supplies. These Control device evaluates the images of the printed image to the effect that the color transfer is checked for completeness and determined from the images taken the optimal Roller positions and thus controls the positioning motors automatically.

Vorteilhaft ist in diesem Zusammenhang, wenn ein Steuerprogramm vorgesehen ist, welchem die geometrischen Abmessungen der am Druck und Einfärbeprozess beteiligten Walzen bekannt sind und welches gegebenenfalls (beispielsweise bei langen Steilwegen, oder nach einem Walzenwechsel) die Position dieser Walzen zueinander durch Signale an die Stellentriebe vorläufig einstellt.
Das erfindungsgemäße Verfahren funktioniert jedoch auch, wenn kein zusätzliches Steuerprogramm vorhanden ist.It is advantageous in this context, if a control program is provided, which the geometrical dimensions of the rollers involved in the printing and inking process are known and which optionally (for example, in long steep paths, or after a roll change) the position of these rollers to each other by signals to the actuator drives provisionally established.
However, the method according to the invention also works if there is no additional control program.

Bei einer vorteilhaften Ausführungsform der Erfindung ist vorgesehen, dass in der Speichereinheit die digitalisierte Sollform des Druckbildes abgelegt ist. Diese Sollform wird dann (gegebenenfalls in der Steuereinrichtung) mit dem jeweils aufgenommene Druckbild verglichen. Die Steuereinrichtung erzeugt dann so lange für die die Walzen verfahrenden Stellantriebe Stellsignale, bis der Vergleich die beste Übereinstimmung zwischen den aufgenommenen Druckbild und deren gespeicherter Sollform ergibt.In an advantageous embodiment of the invention it is provided that in the storage unit, the digitized desired form of the printed image is stored. This desired shape is then (optionally in the control device) with the respectively recorded print image compared. The control device generates then as long as for the rollers traversing actuators actuating signals, until the comparison the best match between the recorded Print image and their stored nominal shape results.

Eine weitere Ausführungsform der Erfindung kommt ohne eine in einem Speicher abgelegte digitalisierte Sollform aus. Bei dieser weiteren Ausführungsform wird ausgenutzt, dass die Intensität des reflektierten Lichts verschiedener Abschnitte des Druckbildes als Funktion der relativen Walzenposition einen charakteristischen Verlauf besitzt.
So ändert sich die Intensität des reflektierten Lichts nicht, solange kein Kontakt zwischen allen am Druck- oder Einfärbeprozess beteillgten Walzen hergestellt ist. Wenn der Kontakt hergestellt ist, beginnt der Farbübertrag auf den Bedruckstoff und die Intensität des reflektierten Lichts ändert sich relativ stark, bis ein Optimalwert des Farbübertrags erreicht ist. Eine weitere Annäherung der Walzen führt dann nur noch zu einer geringeren Änderung der Intensität des reflektierten Lichts.
In dem Bereich, in dem die Intensitätsänderung abflacht, Ist in der Regel ein Optimum zwischen Farbübertrag und Anstelldruck der Walzen gegeneinander erreicht. Eine weitere gegenseitige Annäherung der Walzen baut dann nur noch Druck auf, was dazu führen kann, dass die Walzen, Walzenlager, Druckformen, zu bedruckenden Stoffe usw. geschädigt werden.Another embodiment of the invention does not require a stored in a memory digitized desired form. In this further embodiment, use is made of the fact that the intensity of the reflected light of different sections of the printed image as a function of the relative roller position has a characteristic course.
Thus, the intensity of the reflected light does not change unless contact is made between all the rollers involved in the printing or inking process. When the contact is made, the ink transfer to the substrate begins and the intensity of the reflected light changes relatively strongly until an optimum color transfer value is achieved. A further approximation of the rollers then leads only to a smaller change in the intensity of the reflected light.
In the region in which the intensity change flattened, an optimum between ink transfer and contact pressure of the rollers is usually achieved against each other. A further mutual approach of the rollers then only builds up pressure, which can lead to damage to the rollers, roller bearings, printing plates, materials to be printed, etc.

Aus diesem Grunde Ist es vorteilhaft, das aufgenommene Druckbild in verschiedene Abschnitte zu zerlegen, beziehungsweise gleich mit einer Kamera aufzunehmen, welche eine Vielzahl von Bildabschnitten aufnimmt.
Bei der Auswertung der Bildabschnitte wird der erwähnte Verlauf der Lichtintensität für die einzelnen Bildabschnitte aufgezeichnet.
Erst wenn eine ausreichende Anzahl von Bildabschnitten einen gewissen ausgewählten Intensitätsverlauf aufweist, wird die gegenseitige Annäherung der Walzen aneinander beendet. Bei hohen Anforderungen an die Druckqualität wird das dann der Fall sein, wenn die Änderung der Intensität aller Bildabschnitte zurückgeht beziehungsweise bereits zurückgegangen ist. Damit ist gewährleistet, dass ein guter Farbübertrag auf alle Abschnitte des Druckbildes stattfindet.For this reason, it is advantageous to disassemble the recorded print image into different sections, or to take it with a camera, which receives a plurality of image sections.
In the evaluation of the image sections, the mentioned course of the light intensity is recorded for the individual image sections.
Only when a sufficient number of image sections have a certain selected intensity profile, the mutual approach of the rollers to each other is terminated. With high demands on the print quality, this will be the case when the change in the intensity of all image sections decreases or has already decreased. This ensures that a good ink transfer takes place on all sections of the printed image.

Eine Verbesserung dieser Ausführungsform kann erzielt werden, wenn eine Differenzbildung zwischen den Intensitätswerten des bedruckten Bedruckstoffes und den Intensitätswerten des unbedruckten Bedruckstoffes erfolgt. Die erhaltenen Differenzwerte werden im Folgenden Kontrastwerte genannt. Sie können in ähnlicher Form wie die Intensitätswerte weiterverwendet werden.An improvement of this embodiment can be achieved if a Difference between the intensity values of the printed Substrate and the intensity values of the unprinted substrate he follows. The difference values obtained in the following are contrast values called. They can be similar in form to the intensity values continue to be used.

Als weitere vorteilhafte Maßnahme empfiehlt sich die Verwendung zumindest einer Farbkamera, so dass Licht ausgewählter Wellenlängenbereiche aufgezeichnet werden kann. Diese Maßnahme Ist geeignet, sowohl den Vergleich mit einer gespeicherten digitalisierten Sollform des Druckbildes zu erleichtern als auch den Verlauf der Lichtintensität beziehungsweise der Kontrastwerte in verbesserter Form durchzuführen. Handelsübliche Kameras moderner Bauart besitzen in der Regel als lichtempfindliche Elemente Halbleiterbausteine, die gegenüber Licht bestimmter Wellenlängen sensibel sind, was auf den Photoeffekt und seine Anwendungen Im Halbleiterbereich zurückzuführen ist. Zweckmäßig ist es, wenn eine Kamera auf diese Weise in der Lage ist, Farbintensitätswerten mehrerer Farben (z. B. rot, gelb, blau) elektrische Ausgangswerte zuzuordnen. Diese Werte werden dann einer Regel- und Steuereinheit zugänglich gemacht.
Auf diese Weise kann der Farbintensitätsverlauf verschiedener Farben oder gar des ganzen Spektrums eines Druckbildes oder auch der Abschnitte eines Druckbildes aufgezeichnet werden. Die Messwerte werden dann In der bereits beschriebenen Weise benutzt, um die geeignete Position der Druckwalzen einzustellen. Auch für die einzelnen Farben kann in der bereits beschriebenen Weise eine Kontrastbildung erfolgen.
Lichtintensitätswerte lassen sich auch In für die weitere Auswertung geeignete Koordinatensysteme überführen. Dasselbe gilt natürlich auch für die Kontrastwerte. Auch diese In letzter Instanz von Intensitätswerten und Farbwerten (Wellenlänge/Frequenz) abgeleiteten Werte weisen als Funktion der Relativposition der Walzen einen charakteristischen Verlauf auf und lassen sich in der bereits beschriebenen Weise verwenden.As a further advantageous measure, the use of at least one color camera is recommended, so that light of selected wavelength ranges can be recorded. This measure is suitable both to facilitate the comparison with a stored digitized desired form of the printed image and to carry out the course of the light intensity or the contrast values in an improved form. Commercially available cameras of modern design usually have as photosensitive elements semiconductor devices that are sensitive to light of certain wavelengths, which is due to the photoelectric effect and its applications in the semiconductor field. It is expedient for a camera in this way to be able to assign electrical output values to color intensity values of several colors (eg red, yellow, blue). These values are then made accessible to a control and control unit.
In this way, the color intensity profile of different colors or even the entire spectrum of a printed image or even the sections of a printed image can be recorded. The measured values are then used in the manner already described in order to set the suitable position of the pressure rollers. Also for the individual colors can be done in the manner already described a contrast formation.
Light intensity values can also be converted into coordinate systems suitable for further evaluation. The same naturally applies to the contrast values. These values derived in the last instance from intensity values and color values (wavelength / frequency) also have a characteristic course as a function of the relative position of the rollers and can be used in the manner already described.

Besonders vorteilhaft ist der Einsatz des erfindungsgemäßen Verfahrens beim Flexodruck da hier zusätzlich die Dicke der Klichees zu berücksichtigen ist. Darüber hinaus können deren Klebebänder und andere beteiligte Elemente unterschiedliche Dickentoleranzen aufweisen, so dass es vorkommen kann, dass bei einer nur sanften, leicht berührenden Anstellung nicht sämtliche Teile der Klischees Druckbilder erzeugen und nur Teilbilder entstehen. Daher ist die Abweichung zwischen dem oben erwähnten geometrischen Sollwert und den tatsächlichen Positionen der am Druckprozess beteiligten Walzen beim Flexodruck besonders groß.Particularly advantageous is the use of the method according to the invention Flexo printing because here additionally the thickness of the Klichees is to be considered. In addition, their tapes and other elements involved have different thickness tolerances so that it can happen that at a gentle, slightly touching employment not all parts The clichés create print images and only partial images arise. Therefore, the Deviation between the above-mentioned geometric target value and the actual positions of the rollers involved in the printing process Flexo print especially large.

Als Kamera wird zweckmäßigerweise eine DigitalKamera verwendet, die digitalisierte Bilder der aufgenommenen Druckbilder liefert.As a camera, a digital camera is advantageously used, the provides digital images of the recorded print images.

Bei mehreren Druckwerken kann die Einstellung für jedes Druckwerk gesondert erfolgen.For multiple printing units, the setting can be made separately for each printing unit respectively.

Weiterhin kann eine gesonderte Einstellung der Stellantriebe zur Herstellung der Parallelität der verschiedenen Walzen vorgesehen sein, falls sich aufgrund einer Schrägstellung einer Walze über deren Länge unterschledliche Andrücke ergeben. Beim Flexodruck würde man z. B. eine gesonderte Einsteilbarkeit der Stellantriebe einer Seite des Farbwerkes oder der Farbwerke vorsehen, um v. a. die Parallelität von Druck und Gegendruckzylinder zu gewährleisten.
Ein Messvorgang im Sinne dieser Anmeldung ist die Beobachtung des Verlaufs der Intensitäts- bzw. Kontrastwerte, während die am Druckprozess beteiligten Welzen aufeinander eingestellt werden. Wenn nur eine Kamera verwendet wird, besteht die Möglichkeit, mehrere Farbwerke einer Maschine sequentiell einzustellen, das heißt während der Einstellung eines Farbwerkes jeweils einen Messvorgang durchzuführen.Furthermore, a separate adjustment of the actuators for producing the parallelism of the various rollers may be provided if, due to an inclination of a roller over the length unterschledliche Andrücke arise. When flexographic printing would z. B. a separate adjustability of the actuators one side of the inking unit or the inking provide v. a . to ensure the parallelism of pressure and impression cylinder.
For the purposes of this application, a measuring process is the observation of the course of the intensity or contrast values, while the welts involved in the printing process are adjusted to one another. If only one camera is used, it is possible to sequentially set several inking units of a machine, that is to perform a measuring operation during the setting of an inking unit.

Es ist jedoch auch möglich, an dem Bedruckstoff, welcher bereits mehrere Farbwerke durchlaufen hat, während der Einstellung dieser Farbwerke einer Maschine nur einen Messvorgang durchzuführen. Diese Vorgehensweise führt zu weiterer Zeitersparnis. Diese Vorgehensweise ist gegebenenfalls auch bei Verwendung nur einer Kamera möglich.
Sobald die Einstellung bzw. Einstellungen erreicht sind, die die beste Übereinstimmung zwischen dem aufgenommenen Druckbildern und der Sollform ergeben, können die Werte in einem Speicher abgelegt werden. Dasselbe gilt natürlich auch für diejenigen Einstellwerte, die sich aus den anderen erfindungsgemäßen Einstellverfahren ergeben.
Auf diese Weise können diese Einstellwerte beispielsweise nach einer Druckunterbrechung und nach einem Abfahren des Druckzylinders schnell wieder aufgefunden werden.However, it is also possible to perform only one measuring operation on the printing material, which has already undergone several inking units, during the setting of these inking units of a machine. This procedure leads to further time savings. This procedure may also be possible when using only one camera.
As soon as the setting or settings are achieved which give the best match between the recorded print images and the desired shape, the values can be stored in a memory. The same naturally also applies to those setting values which result from the other setting methods according to the invention.
In this way, these setting values can be found quickly, for example after a print interruption and after a shutdown of the printing cylinder.

Ausführungsbeispiele der Erfindung werden nachstehend anhand der Zeichnungen näher erläutert. In diesen zeigen

Fig 1
schematisch eine Flexodruckmaschine mit nur einem Druckwerk, bei der eine elektronische Steuereinrichtung die Einregelung der Druckwalze die beste Druckqualität ermöglicht, und
Fig 2
A bis C die schematisch die Abfolge der Anstellung von Rasterwalze und Druckwalze einer Flexodruckmaschine relativ zueinander und deren gemeinsame Anstellung an den Gegendruckzylinder
Fig 3
schematisch die Untertellung des Druckbildes in Abschnitte
Fig 4
schematisch den Verlauf der Kontrastwerte eines Bildabschnitts als Funktion der relativen Walzenposition.
Embodiments of the invention are explained below with reference to the drawings. In this show
Fig. 1
schematically a flexographic printing press with only one printing unit, in which an electronic control device enables the adjustment of the pressure roller, the best print quality, and
Fig. 2
A to C schematically the sequence of employment of anilox roller and pressure roller of a flexographic printing machine relative to each other and their joint employment of the impression cylinder
Fig. 3
schematically the submission of the printed image in sections
Fig. 4
schematically shows the course of the contrast values of an image section as a function of the relative roller position.

In einem Druckmaschinengestell, von dem schematisch nur die Seitentelle 1 und 2 dargestellt sind, ist in üblicher Weise eine mit einem Antrieb versehene Gegendruckwalze 3 gelagert. Die Seitenteile 1, 2 tragen eine Druckwerkskonsole 4, auf der in nicht dargestellten Führungen die Lagerböcke 5 und 6 einer Druckwalze 7 und einer Rasterwalze 8 verschieblich in Richtung der Doppelpfeile A und B geführt sind. Die beidseits angeordneten Lagerböcke 5, 6 sind durch einzeln ansteuerbare Stellmotore M1 bis M4 verfahrbar, und zwar In der Welse, dass jede Walze 7, 8 für sich allein verfahrbar und beide auch in einer fixierten Stellung zueinander gemeinsam verfahrbar sind.In a printing machine frame, of which only the side panel 1 schematically 2 and 3, is a drive provided in the usual way Counter-pressure roller 3 stored. The side parts 1, 2 carry a Printing unit console 4, on the guides in not shown, the bearing blocks 5 and 6 of a pressure roller 7 and an anilox roller 8 slidably in the direction the double arrows A and B are performed. The bearing blocks arranged on both sides 5, 6 can be moved by individually controllable servo motors M1 to M4, and Although in the catfish that each roller 7, 8 can be moved by itself and both can also be moved together in a fixed position.

Das Druckmaschinengestell 1, 2 ist mit weiteren nicht dargestellten Farbwerkskonsolen versehen, auf denen in entsprechender Weise Druck- und Rasterwalzen 8 verfahrbar geführt sind, wobei für sämtliche Druckzylinder nur die einzige Gegendruckwalze 3 vorgesehen ist.The printing machine frame 1, 2 is not shown with other Provided inking consoles on which in a similar way printing and Anilox rollers 8 are guided movable, with all printing cylinders only the only counter-pressure roller 3 is provided.

Die erfindungsgemäße Flexodruckmaschine kann grundsätzlich von ihrem mechanischen Aufbau her in gleicher Weise ausgestaltet sein wie die in den DE 29 41 521 A 1, DE 37 42 129 A 1 und DE 40 01 735 A 1 beschriebenen Flexodruckmaschinen.The flexographic printing machine according to the invention can in principle of hers mechanical structure ago be designed in the same way as in the DE 29 41 521 A 1, DE 37 42 129 A 1 and DE 40 01 735 A 1 described Flexo presses.

Die Rasterwalze 8 ist mit einer üblichen Einfärbeinrichtung versehen, die vorzugsweise aus einer bekannten Farbkamerakel besteht. The anilox roller 8 is provided with a conventional inking, the preferably consists of a known color camera.

Die Druckwalze 7 ist mit auf die Papierbahn 17 druckenden Kilschees 9 versehen. In diesem Falle wird ein Rautenmuster, was in der Figur einfach darzustellen ist, aufgedruckt. Durch die an die Gegendruckwalze 3 angestellte Druckwalze 7 wird die über die Gegendruckwalze 3 in Richtung der Pfeile C und D laufende Papierbahn 17 mit einem Druckbild 10 bedruckt, das der Einfachheit halber in Form von Vierecken dargestellt ist. Dieses Druckbild 10 wird in dem Erfassungsbereich 11 von der Kamera K aufgenommen, die aufeinanderfolgend aufgenommene Bilder über die Leitung 12 der mit einem Rechner versehenen Steuer- und Regeleinheit 13 zuführt. In die Steuer- und Regeleinheit 13 werden über eine besondere Eingabeeinrichtung 14 Daten eingegeben, die den Durchmesser der Druckwalze 7 und die Dicke der von dieser getragenen Klischees 9 betreffen.The pressure roller 7 is printing on the paper web 17 Kilschees. 9 Mistake. In this case, a diamond pattern, which is easy in the figure is to be represented, imprinted. By employed to the counter-pressure roller 3 Pressure roller 7 is the over the counter-pressure roller 3 in the direction of arrows C. and D current paper web 17 printed with a printed image 10, the Simplified in the form of squares. This print 10 is received in the detection area 11 by the camera K, which successively taken pictures via the line 12 with a Computer provided control unit 13 supplies. In the tax and Control unit 13 via a special input device 14 data entered, the diameter of the pressure roller 7 and the thickness of relate to these worn clichés 9.

Über eine weitere Eingabeeinhelt 15, beispielsweise in Form von auf einer CD gespeicherten Daten, wird in die Steuer- und Regeleinheit 13 die Sollform des zu druckenden Druckbildes 10 eingegeben. In der Steuer- und Regeleinheit 13 werden zum Beispiel in einer Ausführungsform sodann die von der Kamera K aufgenommenen Druckbilder mit der über die Eingabeeinheit 15 eingegebenen Sollform des Druckbildes verglichen und die Steuer- und Regeleinheit 13 gibt über Leitungen Signale an eine Stelleinrichtung 16 ab, die entsprechend den von der Steuer- und Regeleinheit 13 erzeugten Signalen die Stellmotore M1 bis M4 der Druck- und Rasterwalze 7, 8 steuert.About another input unit 15, for example in the form of on a CD stored data is in the control unit 13, the desired form of entered to be printed image 10. In the control unit 13 For example, in one embodiment, those from the camera K recorded print images with the input via the input unit 15 Sollform the printed image compared and the control unit 13 is via lines signals to an adjusting device 16 from, corresponding to the from the control unit 13 signals generated the servo motors M1 to M4 of the printing and anilox roller 7, 8 controls.

Sobald die Druckwalze 7 auf eine Stellung eingeregelt worden ist, die die qualitativ besten Druckbilder erzeugt, werden die Einstellwerte in einem Speicher der Steuer- und Regeleinheit abgelegt, so dass nach Bedarf die optimale Stellung der Druck- und Rasterwalzen 7, 8 wieder aufgefunden werden kann.Once the pressure roller 7 has been adjusted to a position that the produces the best quality images, the settings are in one Memory of the control unit stored, so that as needed the optimal position of the printing and anilox rollers 7, 8 found again can be.

In den in Figur 2 dargestellten Ausführungsbeispielen wird dargestellt, in welcher Weise beziehungsweise Reihenfolge die drei beteiligten Walzen einer Flexodruckmaschine gegeneinander angestellt werden können. Bei anderen Druckverfahren, wie beispielsweise bei dem Tiefdruck, Ist eine Darstellung der Einstellung der relativen Walzenposition nicht nötig, da beim Tiefdruck nur zwei Walzen am Druckprozess beteiligt sind.
Figur 2 ist in Matrixform aufgebaut. Die mit den Großbuchstaben A bis C bezeichneten Spalten enthalten Ausführungsbelplete, während die mit den kleinen Buchstben a bis e bezeichneten Zeilen Verfahrensschritte der einzelnen Ausführungsbeipiele benennen. Der Bedruckstoff, der beim Bedruckvorgang zwischen der Druck 7 und Gegendruckwalze 6 läuft und welchem in Figur 1 das Bezugszeichen 17 zugeordnet ist, ist in Figur 2 nicht dargestellt. Die individuelle Bewegung einer Walze 7, 8 wird durch einen Pfeil innerhalb einer Walze dargestellt, während ein Pfeil, der durch beide Walzen geht, die gemeinsame Bewegung des Walzenpakets ohne eine Veränderung der Relativposition der Walzen zueinander bezeichnet.
Insbesondere bei der Beschreibung der Figur 2 wird des Öfteren der Begriff "Überdrücken" gebraucht. Daher ist an dieser Stelle darauf hinzuweisen, dass mit "Überdrücken" ein Anstellen oder Andrücken der Walzen gemeint ist, welches über die genauen geometrischen Abmaße derselben hinausgeht. Durch diese Maßnahme wird gewährleistet, dass zwischen den "überdrückten" Walzen oder zwischen dem Bedruckstoff, welcher zwischen überdrückten Walzen bedruckt wird, und einer dieser Walzen in jedem Fall ein vollflächiger Farbübertrag stattfindet. Die "Strecke", um welche hierbei "überdrückt" werden muss beziehungsweise der Druck, der hierzu nötig ist, variiert hierbei von Druckverfahren zu Druckverfahren von Millimeterbruchteilen bis hin zu Millimetern. Klar ist, dass bei den meisten Druckverfahren flexible Walzen, Bedruckstoffe oder andere flexible Zusatzelemente zum Einsatz kommen, welche diese Strecke vergrößern. In diesem Zusammenhang sind die Klischees des Flexodrucks oder der Presseur des Tiefdrucks als Beispiele genannt.
Es ist jedoch auch erwähnenswert, dass auch aus Stahl gefertigte Zylinder sich in der Regel mit einfachen Mittel um Beträge Überdrücken lassen, die über die Unrundheit ihrer Manteloberfläche hinausgeht. Dies ist insbesondere der Fall, wenn die Zylinder über gummierte Mantelflächen verfügen. Darum kann das erwähnte Überdrücken bei verschiedenen Druckverfahren zum Einsatz kommen. In the exemplary embodiments illustrated in FIG. 2 it is shown in which manner or sequence the three rollers involved in a flexographic printing machine can be set against one another. In other printing processes, such as gravure printing, a representation of the relative roll position setting is not necessary because only two rolls are involved in gravure printing in the printing process.
FIG. 2 is constructed in matrix form. The columns denoted by the capital letters A to C contain Ausführungsbelplete, while the designated by the small letters a to e lines designate process steps of the individual Ausführungsbeipiele. The printing material, which runs during printing between the pressure 7 and counter-pressure roller 6 and which is assigned the reference numeral 17 in Figure 1, is not shown in Figure 2. The individual movement of a roller 7, 8 is represented by an arrow within a roller, while an arrow passing through both rollers indicates the mutual movement of the roller packet without a change in the relative position of the rollers relative to one another.
In particular, in the description of Figure 2, the term "overpress" is often used. Therefore, it should be noted at this point that by "overpressing" is meant a pitching or pressing of the rollers which goes beyond the exact geometrical dimensions thereof. By this measure, it is ensured that between the "overpressed" rollers or between the substrate, which is printed between over-pressed rollers, and one of these rollers takes place in any case a full-surface ink transfer. The "distance" by which it must be "overdriven" or the pressure that is necessary for this varies from printing process to printing process from millimeter fractions to millimeters. It is clear that in most printing processes flexible rollers, substrates or other flexible additional elements are used, which increase this distance. In this context, the clichés of flexographic printing or gravure impression are mentioned as examples.
However, it is also worth noting that cylinders made of steel can usually be overpowered by simple means, which goes beyond the ovality of their mantle surface. This is the case in particular if the cylinders have rubberized lateral surfaces. Therefore, the mentioned overpressing can be used in various printing processes.

Bel dem ersten Ausführungsbeispiel A der Figur 2 ist die Zeile a - wie bei den anderen Ausführungsbeispielen auch - der Ausgangszustand bei dem die drei beteiligten Walzen 3, 7, 8 noch nicht gegeneinander angestellt sind.
Im Verfahrensschritt A b wird die Druckwalze 7 gegen die Gegendruckwalze 6 angestellt und in der bereits oben beschriebenen Weise überdrückt. Die Individuelle Bewegung der Druckwalze 7 wird durch den Pfeil dargestellt. Auf diese Weise wird gewährleistet, dass alle Zonen des Klischees (wenn sie eingefärbt sind) Farbe auf den Bedruckstoff übertragen. In dem Verfahrensschritt A b besteht jedoch noch kein Kontakt und damit noch kein Farbübertrag auf die Druckwalze 7 und den Bedruckstoff.
Der nächste Verfahrensschritt c des Ausführungsbeispiels A besteht im Heranfahren der Rasterwalze 8 an die Druckwalze 7 bis alle Bildelemente auf dem Bedruckstoff erkennbar sind. Dieser Umstand wird in der bereits beschriebenen Art mit Hilfe zumindest einer Kamera verifiziert.
Da eine dauerhafte Überdrückung der Im Verfahrensschritt b zueinander eingestellen Walzen 3 und 7 unerwünscht ist, erfolgen nun noch die Verfahrensschritte A d und A e.
Der Verfahrensschritt A d zeigt, wie die beiden Walzen 7 und 8 von der Gegendurckwalze weggefahren werden, wobei die eingestellte Relativposition zwischen der Rasterwalze B und der Druckwalze 7 erhalten bleibt.
Im Rahmen des Verfahrensschritts A e werden die beiden Walzen wieder an die Gegendruckwalze herangefahren, bis wieder alle Bildelemente auf dem Bedrtuckstoff vorhanden sind, was erneut mit Hilfe der Kamera verifiziert wird. Der Vorgang ist damit abgeschlossen, das Druckbild optimiert und der eigentliche Produktionsvorgang kann beginnen.In the first exemplary embodiment A of FIG. 2, the line a - as in the other exemplary embodiments - is the starting state in which the three rollers 3, 7, 8 involved are not yet turned against one another.
In method step A b, the pressure roller 7 is set against the counter-pressure roller 6 and over-pressed in the manner already described above. The individual movement of the pressure roller 7 is represented by the arrow. This ensures that all zones of the plate (when colored) transfer color to the substrate. In the process step A b, however, there is still no contact and thus no ink transfer to the pressure roller 7 and the substrate.
The next step c of the embodiment A is in approaching the anilox roller 8 to the platen 7 until all pixels on the substrate can be seen. This circumstance is verified in the manner already described with the help of at least one camera.
Since a permanent suppression of the set in step b to each other rollers 3 and 7 is undesirable, now carried out the process steps A d and A e.
The process step A d shows how the two rollers 7 and 8 are moved away from the Gegendurckwalze, wherein the set relative position between the anilox roller B and the pressure roller 7 is maintained.
As part of the process step A e, the two rollers are moved back to the counter-pressure roller until all pixels are again present on the Bedruckuckstoff, which is verified again with the help of the camera. The process is completed, the print image optimized and the actual production process can begin.

Auch bei dem zweiten Ausführungsbeipiel B ist die Zeile a der Ausgangszustend, bei dem die drei beteiligten Walzen 3, 7, 8 noch nicht gegeneinander angestellt sind.
Im Verfahrensschritt B b wird die Rasterwalze 8 gegen die Druckwalze 7 angestellt und In der bereits oben beschriebenen Weise überdrückt. Auf diese Weise wird gewährleistet, dass alle Zonen des Klischees vollständig eingefärbt sind. Also in the second embodiment B, the line a is the Ausgangszustend, in which the three rollers involved, 7, 8 are not yet employed against each other.
In method step B b, the anilox roller 8 is set against the pressure roller 7 and over-pressed in the manner already described above. This ensures that all zones of the cliché are completely colored.

Der nächste Verfahrensschritt c des Ausführungsbeipiels B besteht im Heranfahren des Pakets aus Rasterwalze 8 und Druckwalze 7 an die Gegendruckwalze 3 bis alle Bildelemente auf dem Bedruckstoff erkennbar sind. Dieser Umstand wird in der bereits beschriebenen Art mit Hilfe zumindest einer Kamera verifiziert.
Da eine dauerhafte Überdrückung der im Verfahrensschritt b zueinander eingestellen Walzen 7 und 8 unerwünscht ist, erfolgen nun noch die Verfahrensschritte B d und B e.
Der Verfahrensschritt B d zeigt, wie die Walze 8 von der Druckwalze 7 weggefahren wird, wobei die eingestellte Relativposition zwischen der Druckwalze 7 und der Gegendruckwalze 3 erhalten bleibt.
Im Rahmen des Verfahrensschritts B e werden die beiden Waizen wieder aneinandergaführt, bis wieder alle Bildelemente auf dem Bedruckstoff vorhanden sind, was erneut mit Hilfe der Kamera verifiziert wird. Der Vorgang Ist damit abgeschlossen, das Druckbild optimiert und der eigentliche Produktionsvorgang kann beginnen.
Beim dritten Ausführungsbeispiel C werden die Druckwalze 7 und die Rasterwalze 8 gemeinsam an die Gegendruckwalze 3 angestellt wobei alle drei beteiligten Walzen 3, 7, 8 gegeneinander überdrückt werden.
Bei dem Ausführungsbeispiel C1 wird alsdann das aus Druck- 7 und Rasterwalze 8 bestehende Walzenpaar gemeinsam von der Gegendruckwalze abgefahren, wobei die Überdrückung zwischen den Walzen des Walzenpaars bestehen bleibt.
Im Verfahrensschritt C1 d wird das Walzenpaar an die Gegendruckwalze angestellt, bis alle Bildelemente auf den Bedruckstoff übertragen werden.
Im Verfahrensschritt C1 e wird die Rasterwalze 8 von der Druckwalze weggefahren, es findet zumindest kein vollständiger Farbübertrag mehr statt.
Das im Verfahrenschritt C1 f dargestellte Wiederheranfahren der Rasterwalze 8 an die Druckwalze 7 erfolgt wieder, bis das Druckbild ohne Flächenverlust abgebildet wird.The next step c of Ausführungsbeipiels B consists in approaching the package of anilox roller 8 and pressure roller 7 to the platen roller 3 to all pixels on the substrate can be seen. This circumstance is verified in the manner already described with the help of at least one camera.
Since a permanent suppression of the set in step b to each other rollers 7 and 8 is undesirable, now carried out the process steps B d and B e.
The process step B d shows how the roller 8 is moved away from the pressure roller 7, whereby the set relative position between the pressure roller 7 and the counter-pressure roller 3 is maintained.
In the course of process step B e, the two wafers are brought together again until all image elements are present on the printing material, which is verified again with the aid of the camera. The process is completed, the print image optimized and the actual production process can begin.
In the third embodiment C, the pressure roller 7 and the anilox roller 8 are made common to the counter-pressure roller 3 wherein all three rollers involved 3, 7, 8 are suppressed from each other.
In the exemplary embodiment C1, the pair of rollers consisting of printing roller 7 and anilox roller 8 are then driven together by the counterpressure roller, whereby the suppression between the rollers of the roller pair remains.
In process step C1 d, the roller pair is adjusted to the counterpressure roller until all image elements are transferred to the printing material.
In step C1 e, the anilox roller 8 is moved away from the pressure roller, there is at least no complete color transfer instead.
The retraction of the anilox roller 8 to the pressure roller 7 shown in the method step C1 f takes place again until the printed image is imaged without loss of area.

Das Ausführungsbeispiel gemäß Fig. 2 C 2 unterscheidet sich in den Schritten c bis e von dem Ausführungsbeispiel nach Fig. 2 C 1 dadurch, dass Im Schritt c die Rasterwalze 8 von der In überdrückter Stellung an die Gegendruckwalze 7 angestellten Druckwalze aus ihrer überdrückten Stellung relativ zu der Druckwalze In Richtung des Pfeils abgefahren wird. Anschließend wird die Rasterwalze 8 im Schritt d in ihre optimale Anstellung an die Druckwalze gebracht und in den Schritten e und f erfolgt das gemeinsame Abfahren von Druckwalze und Rasterwalze von der Gegendruckwalze und das Anstellen durch die Steuer- und Regeleinheit in einer Form an die Gegendruckwalze, die gewährleistet, dass das Druckbild ohne Flächenverlust abgebildet wird.The embodiment according to FIG. 2C 2 differs in the steps c to e of the embodiment of FIG. 2 C 1 in that in step c the anilox roller 8 from the In overpressed position to the counter-pressure roller. 7 Employed pressure roller from its overpressed position relative to the Pressure roller is moved in the direction of the arrow. Subsequently, the Anilox roller 8 in step d in their optimal employment of the pressure roller brought in steps e and f, the joint departure of Pressure roller and anilox roller from the counterpressure roller and the adjusting by the control unit in a form to the counter-pressure roller, the ensures that the print image is imaged without loss of area.

Figur 3 veranschaulicht schematisch, in welcher Weise das Druckbild 10, welches In dem Rechteck 20 enthalten Ist, in verschiedene Abschnitte 18 zerlegt werden kann. Aus darstellerischen Gründen wurde darauf verzichtet, das Druckbild selbst zu skizzleren. In der Praxis ist es möglich, ein Druckbild 10 in Tausende von Abschnitten 18 zu zerlegen.
Figur 4 zeigt den Kontrastverlauf ki der Abschnitte 18a und 18b, welche als Funktion der Position der Walzen zueinander x aufgetragen ist. Die entstehenden Kennlinien 19 a und 19b sind den Abschnitten 18a und 18b zugeordnet. Es wird sofort klar, dass beide Kennlinien weitgehend dieselbe Gestalt-haben. Der Umstand, dass beide Kennlinien fast identische Maxima aufweisen. Ist jedoch darauf zurückzuführen dass die Kontrastwerte in diesem Ausführungsbeispiel normiert wurden. Eine solche Normierung kann beispielsweise in Bezug auf Durchschnittswerte mehrerer Abschnitte 18 durchgeführt werden.
Die Verlauf der beiden Kennlinien verläuft gegenüber der Walzenposition versetzt, da die am Druckprozess beteiligten Walzen, Klischees usw. wie schon mehrfach erwähnt Toleranzen aufweisen, die In diesem Fall dazu führen, dass der Abschnitt 18a "früher" vollständig bedruckt wird, als der Abschnitt 18b. In dem vorliegenden Ausführungsbeispiel ist der Abschnitt 18a bereits vollständig bedruckt, wenn der Bereich 21a der Kennlinie 19a erreicht wird. Beide Abschnitte 19 a, b sind bedruckt, wenn der Abschnitt 21b der Kennlinie 18b erreicht ist
Analog dazu kann der Beistellvorgang der Druckwalzen beendet werden, wenn der Bereich 21n einer nten Kennlinie erreicht wird, wobei n eine ausgewählte Anzahl von Bildabschnitten ist. FIG. 3 schematically illustrates the manner in which the printed image 10, which is contained in the rectangle 20, can be decomposed into different sections 18. For illustrative reasons, it was decided not to skizzleren the print image itself. In practice, it is possible to decompose a printed image 10 into thousands of sections 18.
FIG. 4 shows the contrast curve k i of the sections 18a and 18b, which is plotted as a function of the position of the rollers relative to each other. The resulting characteristics 19 a and 19 b are assigned to the sections 18 a and 18 b. It immediately becomes clear that both characteristics have largely the same shape. The fact that both characteristics have almost identical maxima. However, due to the fact that the contrast values were normalized in this embodiment. Such standardization may be performed, for example, with respect to average values of multiple sections 18.
The course of the two characteristic curves is offset relative to the roll position, since the rolls involved in the printing process, clichés, etc., as already mentioned several tolerances, which in this case cause the portion 18 a "earlier" is completely printed, as the portion 18 b , In the present embodiment, the portion 18a is already completely printed when the area 21a of the characteristic 19a is reached. Both sections 19 a, b are printed when the portion 21 b of the curve 18 b is reached
Similarly, when the ninth characteristic area 21n is reached, where n is a selected number of image portions, the setting operation of the printing rollers can be terminated.

Der Umstand, dass bei dem gezeigten Ausführungsbeispiel die Bereiche 21 der Kennlinien 19 hinter dem zweiten Wendepunkt der Kennlinien 19 liegen, heißt jedoch nicht, dass das immer der Fall sein muss. Vielmehr weisen auch die abgebildeten Kennlinien mehrere Bereiche auf, der Verlauf so charakteristisch ist, dass eine Auswertevorrichtung ohne weiteres erkennen kann, wann die Kennlinien 19 eine ausgewählte Anzahl von Bildabschnitten 18 einen solchen Bereich erreicht hat. Die Festlegung dieses Bereichs ist damit eine Maßnahme, die von einer Reihe von Parametern abhängt (zu erreichende Druckqualität, Bedruckstoff, Druckverfahren usw.) und nach Bedarf vorgenommen werden kann.
Die Betrachtung der Kennlinien von Figur 4 erleichtert auch das Verständnis dafür, dass alle erfindungsgemäßen Vorrichtungen und Verfahren auch dann funktionieren, wenn die am Druckprozess beteiligten Weizen zunächst gegeneinander überdrückt werden und dann die Walzen voneinander abgefahren (der mechanische Kontakt bleibt allerdings bestehen) werden.
Der Betrachter sähe in diesem Fall zuerst den in Figur 4 rechts dargestellten Bereich der Kennlinien, in dem relative Farbsättigung auf dem Bedruckstoff 17 vorliegt und die Steigung der Kennlinlen gering ist.
In diesem Fall müsste die Auseinanderbewegung der Walzen gestoppt werden, wenn bei einer Anzahl m von Abschnitten 18, die zugeordneten Bereiche 21 der Kennlinien 19 verlassen worden sind und die Kontrastwerte in diesen Bereichen stärker zu sinken beginnen.
Auch diese Variante der Erfindung, bei der die Einstellung der Walzenpositionen durch ein Abfahren der Walzen voneinander zustande kommt und durchgeführt wird, solange wie das Druckbild ohne unerwünschten Flächenverlust abgebildet wird, ist durch die Hauptansprüche abgedeckt.However, the fact that the regions 21 of the characteristic curves 19 lie behind the second inflection point of the characteristic curves 19 in the exemplary embodiment shown does not mean that this always has to be the case. Rather, the characteristics shown have several areas, the course is so characteristic that an evaluation device can easily recognize when the characteristics 19 has reached a selected number of image sections 18 such a range. The definition of this range is therefore a measure that depends on a number of parameters (print quality to be achieved, substrate, printing process, etc.) and can be performed as needed.
The consideration of the characteristics of Figure 4 also facilitates the understanding that all devices and methods of the invention also work when the wheat involved in the printing process are initially suppressed against each other and then traversed the rollers from each other (the mechanical contact will remain).
In this case, the observer first sees the region of the characteristic curves shown on the right in FIG. 4, in which there is relative color saturation on the printing material 17 and the slope of the characteristic curves is low.
In this case, the disengagement of the rollers would have to be stopped if, for a number m of sections 18, the assigned areas 21 of the characteristic curves 19 had been left out and the contrast values in these areas began to decrease more.
This variant of the invention, in which the setting of the roller positions by moving the rollers off each other comes about and is carried out as long as the printed image is reproduced without undesirable loss of area, is covered by the main claims.

Die für die verschiedenen mathematischen Operationen notwendigen Rechenschritte zur Durchführung des dargestellten Ausführungsbeispiels und die Rechenschritte für die Durchführung der anderen in der Beschreibung und den Ansprüchen enthaltenen Ausführungsbeispiele können In einer Auswerte- und Recheneinheit durchgeführt werden. Diese kann ebenfalls in der Steuer- und Regeleinheit 13 enthalten sein. Bezugszeichenliste 1 Druckmaschinengestell 2 Druckmaschinengestell 3. Gegendruckwalze 4 Druckwerkskonsole 5 Lagerbock 6 Lagerbock 7 Druckwalze 8 Rasterwalze 9 Klischee 10 Druckbild 11 Erfassungsbereich 12 Leitung 13 Steuer- und Regeleinheit 14 Eingabeeinrichtung 15 Eingabeeinheit 16 Stelleinrichtung 17 Papierbahn 18 Abschnitte des Druckbilds 19 Kontrastveriauf/Kennlinie 20 Rechteck 21 Bereich der Kennlinie K Kamera M1 Stellantrieb M2 Stellantrieb M3 Stellantrieb M4 Stellantrieb The computation steps necessary for the various mathematical operations for carrying out the illustrated exemplary embodiment and the computation steps for carrying out the other exemplary embodiments contained in the description and the claims can be carried out in an evaluation and arithmetic unit. This can also be contained in the control unit 13. LIST OF REFERENCE NUMBERS 1 Printing machine frame 2 Printing machine frame Third Backing roll 4 Printing unit console 5 bearing block 6 bearing block 7 platen 8th anilox roller 9 cliche 10 print image 11 detection range 12 management 13 Control unit 14 input device 15 input unit 16 setting device 17 paper web 18 Sections of the printed image 19 Kontrastveriauf / curve 20 rectangle 21 Range of the characteristic K camera M1 actuator M2 actuator M3 actuator M4 actuator

Claims (18)

  1. Method for adjusting the printing image of a rotary printing machine by adjusting the relative position of the rolls (3, 7, 8) involved in the ink transfer,
    in which at least some of these rolls (7, 8) are moved towards one another both jointly and independently of one another by dedicated actuating drives (M1 to M4), so that the rolls (3, 7, 8) involved in the printing process can be set against one another,
    characterized in that at least one camera (K) registering the printed image (10) on the printing material web (17) supplies successively recorded images to an electronic control and regulating unit (13),
    in that the control and regulating unit evaluates the images of the printed image or the images of parts of the printed image,
    hereby checks the colour transfer in the images of the printed image or parts of the printed image for completeness,
    and in that the control and regulating unit (13) generates signals for the actuating drives of at least some of the rolls (3, 7, 8) involved in the printing and inking process until or as the images of the printed image or of the parts of the printed image are depicted completely.
  2. Method according to Claim 1,
    characterized in that first of all the position of the rolls (3, 7, 8) in relation to one another is set tentatively by a control program by means of signals to the actuating drives, to which program the geometric dimensions of the rolls (3, 7, 8) involved in the printing and inking process or, respectively, their relative positions that can be derived from these dimensions are known, and
    in that the camera then supplies the successively recorded images to an electronic control and regulating unit (13), and
    in that the control and regulating unit then generates signals for the actuating drives of at least some of the rolls (3, 7, 8) involved in the printing and inking process until or as the images of the printed image or other parts of the printed image are depicted completely.
  3. Method according to Claim 1 or 2,
    characterized in that the digitized intended form of the printed image is stored in a memory unit,
    in that the respectively recorded printed image is compared with the intended form in a comparison unit of the control and regulating unit (13), and
    in that the control and regulating unit (13) generates signals for actuating drives of the rolls involved in the printing or inking process until or as the comparison results in the best agreement between the recorded printed image and the stored intended form.
  4. Method according to Claim 1 or 2,
    characterized in that an evaluation or computing unit (13) relates the intensity of the reflected light from various sections (18) of the printed image with the roll positions, it being possible to observe a similar intensity curve (19) typical of the printing process for various sections of the printed image, and
    in that the control and regulating unit (13) generates signals for actuating drives (M1, M2, M3, M4) of the rolls (3, 7, 8) involved in the printing or inking process until a predefined proportion of the various sections (18) of the printed image (10) exhibits or has exhibited a specific intensity curve (19).
  5. Method according to Claim 1 or 2,
    characterized in that the intensity of the reflected light from various sections (18) of the printed image (10) is subtracted from the intensity of the light reflected from the unprinted printing material (17), and
    in that an evaluation or computing unit (13) relates these difference or contrast values (ki) from sections of the printed image to the relative roll positions, it being possible to observe a similar intensity curve or contrast value curve (19) typical of the printing process for various sections of the printed image, and
    in that the control and regulating unit (13) generates signals for actuating drives (M1, M2, M3, M4) of the rolls (3, 7, 8) involved in the printing or inking process until a predefined proportion of the various sections (18) of the printed image (10) exhibits or has exhibited a specific intensity curve or contrast value curve (19).
  6. Method according to Claim 3, 4 or 5,
    characterized in that the recording of the printed image (10) or at least of parts of the same (10) is provided with at least one colour camera (K) for recording.
  7. Method according to Claim 6, referring back to Claim 4 or 5,
    characterized in that the curve of the light intensity or the curve of the contrast values of at least one colour is related to the roll positions by a computing unit, and
    in that the control and regulating unit (13) generates signals for actuating drives (M1, M2, M3, M4) of the rolls (3, 7, 8) involved in the printing or inking process until a predefined proportion of the various sections of the printed image (10) exhibits or has exhibited a specific colour intensity curve (19).
  8. Method according to Claim 7, referring back to Claim 4 or 5,
    characterized in that the light intensity values or contrast values (19) of a plurality of colours are recorded by the control and regulating unit, and
    in that a computing unit transfers these values into another coordinate system, which is based on the coordinates derived from the light intensity values or contrast values (19), and
    in that at least a selection of these coordinates is related to the relative roll positions,
    in that the control and regulating unit (13) generates signals for actuating drives (M1, M2, M3, M4) of the rolls (3, 7, 8) involved in the printing or inking process until a predefined proportion of the various sections (18) of the printed image (10) exhibits or has exhibited a specific coordinate curve.
  9. Method according to one of Claims 4, 5, 7 and 8,
    characterized in that the values (ki) derived from the light intensity or colour intensity of the reflected light from the printed image are normalized.
  10. Method according to one of Claims 4, 5, 7, 8 and 9,
    characterized in that the values (ki) derived from the light intensity or colour intensity of the reflected light from the printed image are plotted against the position of the rolls (3, 7, 8) involved in the printing or inking process and are rendered visible on a console or a screen.
  11. Method according to one of Claims 1 to 10,
    characterized in that, in the case of a plurality of printing units, the adjustment for each printing unit is carried out on the basis of separate measuring operations.
  12. Method according to one of Claims 1 to 10,
    characterized in that the adjustment of a plurality of printing units is carried out on the basis of one measuring operation.
  13. Method according to one of Claims 1 to 12,
    characterized in that the geometric adjustments of the rolls (3, 7, 8) in relation to one another at which the best agreement between the recorded printed image (10) and the intended form of the printed image was established
    and/or until a predefined proportion of the various sections (3, 7, 8) of the printed image exhibits or has exhibited a specific intensity or contrast curve are stored in a memory.
  14. Method for adjusting the printed image of a rotary printing machine according to one of Claims 1 to 13,
    characterized in that, during the process of setting the rolls (3, 7, 8) involved in the printing process against one another, at least one example of overprinting occurs between at least two rolls (3, 7, 8).
  15. Method for adjusting the printed image of a rotary printing machine according to Claim 14,
    characterized in that the contact pressure which prevails between the rolls (3, 7, 8) involved in the overprinting is reduced again and the overprinting is eliminated.
  16. Method for adjusting the printed image of a rotary printing machine according to Claim 15,
    characterized in that, after the contact pressure has been reduced, the rolls (3, 7, 8) are set against one another again, the contact pressure rising again.
  17. Rotary printing machine, in which the adjustment of its printing image can be carried out by adjusting the relative position of rolls (3, 7, 8) involved in the ink transfer,
    in which at least some of these rolls (7, 8) can be moved towards one another both jointly and independently of one another by dedicated actuating drives (M1 to M4), so that the rolls (3, 7, 8) involved in the printing process can be set against one another,
    characterized in that at least one camera (K) registering the printed image (10) on the printing material web (17) for supplying successively recorded images to an electronic control and regulating unit (13) is provided,
    in that the control and regulating unit (13) can evaluate the images of the printed image or the images of parts of the printed image,
    in that, furthermore, the colour transfer in the images of the printed image or parts of the printed image can be checked for completeness by the control and regulating unit,
    and in that the control and regulating unit (13) is designed to generate signals for the actuating drives of at least some of the rolls (3, 7, 8) involved in the printing and inking process until or as the images of the printed image or of the parts of the printed image are depicted completely.
  18. Rotary printing machine according to Claim 17,
    characterized in that the actuating drives are equipped with a separate adjusting device for producing the parallelism of rolls (3, 7, 8) involved in the printing process.
EP02005727A 2001-03-27 2002-03-13 Device for adjusting the printing image in a flexographic printing machine Expired - Lifetime EP1249346B2 (en)

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DE10115134 2001-03-27
DE10145957.2A DE10145957B4 (en) 2001-03-27 2001-09-18 Apparatus and method for adjusting the printed image in a flexographic printing machine
DE10145957 2001-09-18

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US6634297B2 (en) 2003-10-21
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DE50204501D1 (en) 2006-02-23
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ATE306395T1 (en) 2005-10-15
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US20030005840A1 (en) 2003-01-09
DE10145957B4 (en) 2014-09-25
CA2379013A1 (en) 2002-09-27
EP1249346A1 (en) 2002-10-16
EP1249346B2 (en) 2013-03-06
EP1666252B1 (en) 2012-06-13
JP2002355951A (en) 2002-12-10
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EP1666252A2 (en) 2006-06-07
ES2386548T3 (en) 2012-08-22

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