EP1666252B1 - Device and method for adjusting the printing image in a flexographic printing machine - Google Patents

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

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Publication number
EP1666252B1
EP1666252B1 EP05022128A EP05022128A EP1666252B1 EP 1666252 B1 EP1666252 B1 EP 1666252B1 EP 05022128 A EP05022128 A EP 05022128A EP 05022128 A EP05022128 A EP 05022128A EP 1666252 B1 EP1666252 B1 EP 1666252B1
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EP
European Patent Office
Prior art keywords
printing
rolls
involved
intensity
values
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Application number
EP05022128A
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German (de)
French (fr)
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EP1666252A3 (en
EP1666252A2 (en
Inventor
Martin Krümpelmann
Dietmar Pötter
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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
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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 13.
  • flexographic printing machines which are equipped with a pressure roller and an anilox roller, which are movable on at least one console of the printing press frame. These two rollers can be employed by their own actuators both independently of each other and together to the impression cylinder on which the printing material is applied.
  • 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 roller and the counterpressure roller, taking into account the geometrical dimensions of the machine and the diameter of the rollers.
  • This control device sets the relative roller positions, so that it should be ensured that all parts of the printed image are transmitted.
  • This loading operation is performed by the print engine operator, who adjusts the roll positions while observing the print image.
  • This type of adjustment of the printed image ensures that a very good printed image is obtained against each other with the least amount of pressure applied to the rollers involved in the printing process.
  • 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 From the DE 2 060 000 A1
  • the object of the invention is therefore to provide a device or a method of the type described, which allows automatic adjustment of the print image to the desired optimum quality.
  • this object is achieved in a device or a method of the type specified in that at least one of the print image on the printing substrate detecting camera is provided, the successively recorded intensity values of light, which is reflected at least from image portions of the printed image, an electronic control device supplies.
  • This control device generates as long as signals for the actuators at least part of the rollers involved in the printing and inking process, until or as the recorded intensity values have a certain course or have exhibited.
  • This control device thus evaluates the intensity values in such a way that these intensity values are checked, and determines from the recorded intensity values the optimum roll positions and thus controls the positioning motors automatically.
  • One goal may be to image the printed image without loss of area on the substrate.
  • the course of the intensity values are evaluated. Until or how the change of the intensity values has a certain course, which represents an optimal pressure. Then the Anstellvorgang can be terminated or at least interrupted.
  • the intensity values of the light of selected spectral ranges, ie wavelengths can be recorded.
  • the addition process is terminated when or as long as the best match between the measurement and the target image exists.
  • control program to which the geometrical dimensions of the rollers involved in the printing and inking process are known and which optionally (for example in the case of long travel ranges, or after a roll change) provisionally adjusts the position of these rollers by signals to the actuators.
  • the digitized desired shape of the printed image is stored in the memory unit.
  • This desired shape is then (possibly in the control device) compared with the respective recorded print image.
  • the control device then generates actuating signals for the actuators moving the rollers until the comparison yields the best match between the recorded print image and its stored desired shape.
  • 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 improvement of this embodiment can be achieved if there is a difference between the intensity values of the printed substrate and the intensity values of the unprinted substrate.
  • the difference values obtained are referred to below as contrast values. They can be used in a similar way as the intensity values.
  • 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 shape of the printed image and to perform 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 goes for the course Contrast values.
  • These values derived in the last analysis 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 expediently used, which supplies digitized images of the recorded print images.
  • the setting can be made separately for each printing unit.
  • 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 thereof different pressures result.
  • 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 operation in the sense of this application is the observation of the course of the intensity or contrast values, while the rollers 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.
  • the values can be stored in a memory.
  • At least one suppression takes place between at least two rollers during the addition process of the rollers involved in the printing process.
  • a counter-pressure roller 3 provided with a drive is mounted in the usual way.
  • 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 guided in the direction of the double arrows A and B.
  • the mutually arranged bearing blocks 5, 6 are movable by individually controllable servo motors M1 to M4, in such a way that each roller 7, 8 can be moved by itself and both in a fixed position to each other are moved together.
  • the printing machine frame 1, 2 is provided with further Farbwerkskunsolen not shown, on which in a corresponding manner printing and anilox rollers 8 are moved, with only the single impression roller 3 is provided for all printing cylinder.
  • the flexographic printing machine according to the invention can in principle be designed in the same way as in the case of its mechanical construction DE 29 41 521 A 1 .
  • the anilox roller 8 is provided with a conventional inking device, which preferably consists of a known ink chamber doctor blade.
  • the pressure roller 7 is provided with printing on the web 17 clichés 9. In this case, a diamond pattern, which is easy in the figure is to be represented, imprinted.
  • the running on the platen 3 in the direction of arrows C and D paper web 17 is printed with a printed image 10, which is shown for the sake of simplicity in the form of squares.
  • This print image 10 is recorded in the detection area 11 by the camera K, which feeds successively recorded images via the line 12 to the computer-equipped control unit 13.
  • data are entered via a special input device 14, which relate to the diameter of the pressure roller 7 and the thickness of the worn therefrom 9 clichés.
  • the desired shape of the printed image 10 to be printed is entered into the control and regulation unit 13.
  • the control and regulation unit 13 for example, in one embodiment, the printed images taken by the camera K are compared with the desired form of the printed image entered via the input unit 15, and the control and regulating unit 13 sends signals to an adjusting device 16 via lines according to the signals generated by the control unit 13, the servo motors M1 to M4 of the printing and anilox roller 7, 8 controls.
  • the settings are stored in a memory of the control unit, so that, if necessary, the optimal position of the printing and anilox rollers 7, 8 can be found again ,
  • FIG. 2 illustrated embodiments is shown in which way or order the three rollers involved a flexographic printing machine can be employed against each other.
  • 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 exemplary embodiments, while the lines denoted by the small letters a to e designate method steps of the individual exemplary embodiments.
  • the printing material that runs during the printing process between the pressure 7 and counter-pressure roller 6 and which in FIG. 1 the reference numeral 17 is assigned is in FIG. 2 not shown.
  • 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.
  • the term "overpress" is used.
  • overpressing is meant a pitching or pressing of the rollers which goes beyond the exact geometrical dimensions thereof.
  • 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.
  • 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.
  • a of the FIG. 2 is the line a - as in the other embodiments also - the initial state in which the three rollers involved 3, 7, 8 are not yet employed against each other.
  • 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.
  • step A b there is still no contact and thus no ink transfer to the pressure roller 7 and the substrate.
  • 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 in step b to each other set 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 counter-pressure roller, wherein the set relative position between the anilox roller 8 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 substrate, 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 initial state, in which the three rollers involved, 7, 8 are not yet employed against each other.
  • the anilox roller 8 is made against the pressure roller 7 and suppressed in the manner already described above. This ensures that all zones of the cliché are completely colored.
  • the next step c of the embodiment B is 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.
  • 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.
  • step B e the two rollers are again brought together until again all pixels are present on the substrate, 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 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. 2 C 2 differs in the steps c to e of the embodiment Fig. 2 C 1 in that, in step c, the anilox roller 8 is moved away from the press roller engaged in the overpressure position to the counterpressure roller 7 from its overpressed position relative to the pressure roller in the direction of the arrow. Subsequently, the anilox roller 8 in step d in their optimal employment of the pressure roller brought and in steps e and f, the common departure of pressure roller and anilox roll from the platen roller and the hiring done by the control unit in a form to the platen, which ensures that the printed image is imaged without loss of area.
  • FIG. 3 schematically illustrates how the printed image 10, which is contained in the rectangle 20, can be decomposed into different 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 x.
  • 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 are largely the same shape. However, the fact that both characteristics have almost identical maxima is 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 19 b is reached.
  • 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 on several areas, the course so It is characteristic that an evaluation device can easily recognize when the characteristic curves 19 of a selected number of image sections 18 has reached 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.

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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 13.The invention relates to a device and a method according to the preamble of claims 1 and 13.

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.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 are equipped with a pressure roller and an anilox roller, which are movable on at least one console of the printing press frame. These two rollers can be employed by their own actuators both independently of each other and together to the impression cylinder on which the printing material is applied.

So zeigen die DE 29 41 521 A1 und DE 37 42 129 A1 Druckmaschinen, bei 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 Schlitten der Druckzylinder mit weiteren Schlittenführungen für die die Lagerböcke der Farbauftrags- oder Rasterwalzen tragenden Schlitten versehen sind, die wiederum eigene Spindeltriebe aufweisen.So show the DE 29 41 521 A1 and DE 37 42 129 A1 Printing machines, in which the bearing blocks of the pressure cylinder carrying carriage guided in carriage guides of the inking unit of the printing machine frame and are provided with their own spindle drives and in which the carriage of the printing cylinder are provided with further slide guides for the bearing blocks of the inking or anilox rollers carrying carriage, 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 Rasterwalzen tragenden Schlitten in einer gemeinsamen Schlittenführung der Farbwerkskonsolen der Druckmaschine geführt und gemeinsam und einzeln durch Spindelantriebe verfahrbar sind.Out DE 40 01 735 A 1 a flexographic printing machine is known in which the carriage carrying the pressure roller and carrying the inking or anilox rollers carriage guided in a common carriage guide of the inking unit of the printing press and can be moved together and individually by spindle drives.

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 Gegendruckwalze unter Berücksichtigung der geometrischen Abmessungen der Maschine und der Durchmesser der Walzen. Diese Steuereinrichtung stellt dann die relativen Walzenpositionen ein, so dass gewährleistet sein sollte, 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
Aus der DE 2 060 000 A1 ist bekannt, den Farbauftrag einer Druckmaschine in laufendem Druckbetrieb unabhängig von dem Augenschein des Druckmaschinenführer zu regeln- Zu diesem Zweck werden bestimmte Bereiche des Druckbildes mit optischen Sensoren abgetastet. Die Spannungsausgangssignale der Sensoren werden mit festen Werten In einem Komparator verglichen. Dem Vergleich folgt entweder eine Änderung des Andrucks zwischen der Druck- und der Einfärbewalze oder eine Änderung der Viskosität der Druckfarbe.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 roller and the counterpressure roller, taking into account the geometrical dimensions of the machine and the diameter of the rollers. This control device then sets the relative roller positions, so that it should be ensured that all parts of the printed image are transmitted.
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.
This type of adjustment of the printed image ensures that a very good printed image is obtained against each other with the least amount of pressure applied to the rollers involved in the printing process. 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
From the DE 2 060 000 A1 It is known to regulate the inking of a printing press in continuous printing operation independently of the visual inspection of the printing machine operator. For this purpose, certain areas of the printed image are scanned with optical sensors. The voltage outputs of the sensors are compared to fixed values in a comparator. The comparison is followed either by a change in the pressure between the printing and the inking roller or a change in the viscosity of the ink.

Zu den Nachteilen dieses Verfahrens gehört, dass eine ganze Reihe unterschiedlicher Absolutwerte gespeichert oder in anderer Form vorgehalten werden müssen, um den Vergleich zu ermöglichen.One of the disadvantages of this method is that a number of different absolute values must be stored or otherwise maintained to allow comparison.

Aufgabe der Erfindung ist es daher, eine Vorrichtung bzw. ein Verfahren der eingangs angegebenen Art zu schaffen, die eine automatische Einstellung des Druckbildes auf die gewünschte optimale Qualität ermöglicht.The object of the invention is therefore to provide a device or a method of the type described, which allows 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 Intensitätswerte von Licht, welches zumindest von Bildabschnitten des Druckbildes reflektiert wird, einer elektronischen Steuereinrichtung zuführt.
Diese Steuereinrichtung erzeugt solange Signale für die Stellantriebe zumindest eines Teils der am Druck- und Einfärbeprozess beteiligten Walzen, bis oder wie die aufgenommenen Intensitätswerteeinen bestimmten Verlauf aufweisen beziehungsweise aufgewiesen haben.
Diese Steuereinrichtung wertet damit dieintensitätswerte dahingehend aus, dass diese Intensitätswerte geprüft werden, und ermittelt aus den aufgenommenen Intensitätswerten die optimalen Walzenpositionen und steuert damit die Positioniermotoren automatisch an.According to the invention, this object is achieved in a device or a method of the type specified in that at least one of the print image on the printing substrate detecting camera is provided, the successively recorded intensity values of light, which is reflected at least from image portions of the printed image, an electronic control device supplies.
This control device generates as long as signals for the actuators at least part of the rollers involved in the printing and inking process, until or as the recorded intensity values have a certain course or have exhibited.
This control device thus evaluates the intensity values in such a way that these intensity values are checked, and determines from the recorded intensity values the optimum roll positions and thus controls the positioning motors automatically.

Ein Ziel kann sein, das Druckbild ohne Flächenverlust auf dem Bedruckstoff abzubilden.One goal may be to image the printed image without loss of area on the substrate.

Vorteilhaft ist dabei, wenn der Verlauf der Intensitätswerte ausgewertet werden. Bis oder wie die Änderung der Intensitätswerte einen bestimmten Verlauf haben, welche einen optimalen Andruck darstellen. Dann kann der Anstellvorgang beendet oder zumindest unterbrochen werden.It is advantageous if the course of the intensity values are evaluated. Until or how the change of the intensity values has a certain course, which represents an optimal pressure. Then the Anstellvorgang can be terminated or at least interrupted.

In einer anderen Ausführungsform können die Intensitätswerte des Lichts ausgewählter Spektralbereiche, also Wellenlängen, aufgenommen werden.In another embodiment, the intensity values of the light of selected spectral ranges, ie wavelengths, can be recorded.

In weiterer Ausführungsform ist vorgesehen, die Werte der Lichtintensität mit einem in einem Speicher abgelegten Sollbild zu vergleichen. Der Beistellprozess wird dann beendet, wenn oder solange die beste Übereinstimmung zwischen der Messung und des Sollbildes besteht.In a further embodiment, it is provided to compare the values of the light intensity with a target image stored in a memory. The addition process is terminated when or as long as the best match between the measurement and the target image exists.

Vorteilhaft ist es, wenn ein Steuerprogramm vorgesehen ist, welchem die geometrischen Abmessungen der am Druck und Einfärbeprozess beteiligten Walzen bekannt sind und welches gegebenenfalls (beispielsweise bei langen Stellwegen, oder nach einem Walzenwechsel) die Position dieser Walzen zueinander durch Signale an die Stellantriebe vorläufig einstellt.It is advantageous if a control program is provided, to which the geometrical dimensions of the rollers involved in the printing and inking process are known and which optionally (for example in the case of long travel ranges, or after a roll change) provisionally adjusts the position of these rollers by signals to the actuators.

Das erfindungsgemäße Verfahren funktioniert jedoch auch, wenn kein zusätzliches Steuerprogramm vorhanden ist.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.In an advantageous embodiment of the invention, it is provided that the digitized desired shape of the printed image is stored in the memory unit.

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.This desired shape is then (possibly in the control device) compared with the respective recorded print image. The control device then generates actuating signals for the actuators moving the rollers until the comparison yields the best match between the recorded print image and its stored desired shape.

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.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.

So ändert sich die Intensität des reflektierten Lichts nicht, solange kein Kontakt zwischen allen am Druck- oder Einfärbeprozess beteiligten 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.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 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.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 at the same time to take it with a camera which records 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 print quality this will be the case if 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 there is a difference between the intensity values of the printed substrate and the intensity values of the unprinted substrate. The difference values obtained are referred to below as contrast values. They can be used in a similar way as the intensity values.

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.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 shape of the printed image and to perform 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.

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.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.

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.Light intensity values can also be converted into coordinate systems suitable for further evaluation. The same goes for the course Contrast values. These values derived in the last analysis 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 in flexographic printing, since in this case the thickness of the stitches has to be considered additionally. In addition, their adhesive tapes and other elements involved may have different thickness tolerances, so that it may happen that in a gentle, slightly touching employment not all parts of the plates produce printed 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 in the flexographic printing is particularly large.

Als Kamera wird zweckmäßigerweise eine Digitalkamera verwendet, die digitalisierte Bilder der aufgenommenen Druckbilder liefert.As a camera, a digital camera is expediently used, which supplies digitized 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.

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 unterschiedliche Andrücke ergeben. Beim Flexodruck würde man z. B. eine gesonderte Einstellbarkeit der Stellantriebe einer Seite des Farbwerkes oder der Farbwerke vorsehen, um v. a. die Parallelität von Druck und Gegendruckzylinder zu gewährleisten.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 thereof different pressures result. 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.

Ein Messvorgang im Sinne dieser Anmeldung ist die Beobachtung des Verlaufs der Intensitäts- bzw. Kontrastwerte, während die am Druckprozess beteiligten Walzen 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.A measuring operation in the sense of this application is the observation of the course of the intensity or contrast values, while the rollers 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.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.

Sobald die Einstellung bzw. Einstellungen erreicht sind, die die beste Übereinstimmung zwischen den 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.As soon as the settings or settings are reached that give the best match between the recorded print images and the target 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.

Auf diese Weise können diese Einstellwerte beispielsweise nach einer Druckunterbrechung und nach einem Abfahren des Druckzylinders schnell wieder aufgefunden werden.In this way, these setting values can be found quickly, for example after a print interruption and after a shutdown of the printing cylinder.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, dass während des Beistellprozesses der am Druckprozess beteiligten Walzen zumindest eine Überdrückung zwischen zumindest zwei Walzen stattfindet.In a further embodiment of the invention, it is provided that at least one suppression takes place between at least two rollers during the addition process of the rollers involved in the printing process.

Vorteilhaft ist hierbei, wenn der Anpressdruck, der zwischen den an der Überdrückung beteiligten Walzen herrscht, wieder gesenkt und die Überdrückung aufgehoben wird. Weiterhin kann vorgesehen sein, dass die Walzen, nachdem der Anpressdruck gesenkt wurde, wieder gegeneinander angestellt werden, wobei der Anpressdruck erneut steigt.It is advantageous here if the contact pressure which prevails between the rollers involved in the suppression, lowered again and the suppression is canceled. Furthermore, it can be provided that the rollers, after the contact pressure has been lowered, are again set against each other, wherein the contact pressure increases again.

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 Unterteilung 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 show 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 subdivision of the printed image into 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 Seitenteile 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 Weise, 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 parts 1 and 2 are shown schematically, a counter-pressure roller 3 provided with a drive is mounted in the usual way. 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 guided in the direction of the double arrows A and B. The mutually arranged bearing blocks 5, 6 are movable by individually controllable servo motors M1 to M4, in such a way that each roller 7, 8 can be moved by itself and both in a fixed position to each other are moved together.

Das Druckmaschinengestell 1, 2 ist mit weiteren nicht dargestellten Farbwerkskunsolen 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 provided with further Farbwerkskunsolen not shown, on which in a corresponding manner printing and anilox rollers 8 are moved, with only the single impression roller 3 is provided for all printing cylinder.

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 be designed in the same way as in the case of its mechanical construction DE 29 41 521 A 1 . DE 37 42 129 A 1 and DE 40 01 735 A 1 described flexographic printing machines.

Die Rasterwalze 8 ist mit einer üblichen Einfärbeinrichtung versehen, die vorzugsweise aus einer bekannten Farbkammerrakel besteht.The anilox roller 8 is provided with a conventional inking device, which preferably consists of a known ink chamber doctor blade.

Die Druckwalze 7 ist mit auf die Papierbahn 17 druckenden Klischees 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 provided with printing on the web 17 clichés 9. In this case, a diamond pattern, which is easy in the figure is to be represented, imprinted. By hired to the platen roller 3 pressure roller 7, the running on the platen 3 in the direction of arrows C and D paper web 17 is printed with a printed image 10, which is shown for the sake of simplicity in the form of squares. This print image 10 is recorded in the detection area 11 by the camera K, which feeds successively recorded images via the line 12 to the computer-equipped control unit 13. In the control unit 13 data are entered via a special input device 14, which relate to the diameter of the pressure roller 7 and the thickness of the worn therefrom 9 clichés.

Über eine weitere Eingabeeinheit 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.Via another input unit 15, for example in the form of data stored on a CD, the desired shape of the printed image 10 to be printed is entered into the control and regulation unit 13. In the control and regulation unit 13, for example, in one embodiment, the printed images taken by the camera K are compared with the desired form of the printed image entered via the input unit 15, and the control and regulating unit 13 sends signals to an adjusting device 16 via lines according to the signals generated by the control unit 13, 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 produces the best quality printed images, the settings are stored in a memory of the control unit, so that, if necessary, the optimal position of the printing and anilox rollers 7, 8 can be found again ,

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.In the in FIG. 2 illustrated embodiments is shown in which way or order the three rollers involved a flexographic printing machine can be employed against each other. 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.

Figur 2 ist in Matrixform aufgebaut. Die mit den Großbuchstaben A bis C bezeichneten Spalten enthalten Ausführungsbeispiele, während die mit den kleinen Buchstaben a bis e bezeichneten Zeilen Verfahrensschritte der einzelnen Ausführungsbeispiele 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. FIG. 2 is constructed in matrix form. The columns denoted by the capital letters A to C contain exemplary embodiments, while the lines denoted by the small letters a to e designate method steps of the individual exemplary embodiments. The printing material that runs during the printing process between the pressure 7 and counter-pressure roller 6 and which in FIG. 1 the reference numeral 17 is assigned is in FIG. 2 not shown. 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 the FIG. 2 Often the term "overpress" is 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 mentioning 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.

Bei 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.In the first embodiment A of the FIG. 2 is the line a - as in the other embodiments also - the initial state in which the three rollers involved 3, 7, 8 are not yet employed against each other.

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 eingestellten 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 Gegendruckwalze weggefahren werden, wobei die eingestellte Relativposition zwischen der Rasterwalze 8 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 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.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 in step b to each other set 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 counter-pressure roller, wherein the set relative position between the anilox roller 8 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 substrate, 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 Ausführungsbeispiel B ist die Zeile a der Ausgangszustand, 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.
Der nächste Verfahrensschritt c des Ausführungsbeispiels B besteht im Heranfahren des Pakets aus Rasterwalze 8 und Druckwalze 7 an die Gegendruckwalze 3 bis alle Bildelemente auf dem Bedruckstoff erkennbar sind.Also in the second embodiment B, the line a is the initial state, in which the three rollers involved, 7, 8 are not yet employed against each other.
In process step B b, the anilox roller 8 is made against the pressure roller 7 and suppressed in the manner already described above. This ensures that all zones of the cliché are completely colored.
The next step c of the embodiment B is 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.

Dieser Umstand wird in der bereits beschriebenen Art mit Hilfe zumindest einer Kamera verifiziert.
Da eine dauerhafte Überdrückung der im Verfahrensschritt b zueinander eingestellten 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 Walzen wieder aneinandergeführt, 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.This circumstance is verified in the manner already described with the help of at least one camera.
Since a permanent suppression of the rollers 7 and 8, which are set to one another in method step b, is undesirable, method steps B d and B e are now carried out.
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.
As part of the process step B e, the two rollers are again brought together until again all pixels are present on the substrate, 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.
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. 2 C 2 differs in the steps c to e of the embodiment Fig. 2 C 1 in that, in step c, the anilox roller 8 is moved away from the press roller engaged in the overpressure position to the counterpressure roller 7 from its overpressed position relative to the pressure roller in the direction of the arrow. Subsequently, the anilox roller 8 in step d in their optimal employment of the pressure roller brought and in steps e and f, the common departure of pressure roller and anilox roll from the platen roller and the hiring done by the control unit in a form to the platen, which ensures that the printed 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 skizzieren. 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 19b erreicht ist.
Analog dazu kann der Beistellvorgang der Druckwalzen beendet werden, wenn der Bereich 21 n einer nten Kennlinie erreicht wird, wobei n eine ausgewählte Anzahl von Bildabschnitten ist.
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, deren Verlauf so charakteristisch ist, dass eine Auswertevorrichtung ohne weiteres erkennen kann, wann die Kennlinien 19 einer ausgewählten 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 Walzen 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 Kennlinien 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. FIG. 3 schematically illustrates how the printed image 10, which is contained in the rectangle 20, can be decomposed into different sections 18. For illustrative reasons, it was omitted to sketch 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 x. 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 are largely the same shape. However, the fact that both characteristics have almost identical maxima is 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 19 b is reached.
Similarly, when the nip section 21 n is reached, where n is a selected number of image sections, the setting operation of the printing rollers can be terminated.
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 on several areas, the course so It is characteristic that an evaluation device can easily recognize when the characteristic curves 19 of a selected number of image sections 18 has reached 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 FIG. 4 also makes it easier to understand that all the devices and methods according to the invention also work when the rollers involved in the printing process are initially over-pressed against each other and then the rollers are moved away from each other (the mechanical contact, however, remains).
The viewer would see in this case first in FIG. 4 shown right portion of the curves in which there is relative color saturation on the substrate 17 and the slope of the characteristics 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 Kontrastverlauf/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 3 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 Contrast curve / curve 20 rectangle 21 Range of the characteristic K camera M1 actuator M2 actuator M3 actuator M4 actuator

Claims (15)

  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 transfer of ink,
    - it being possible for at least some of these rolls (7, 8) to be moved towards one another, both jointly and independently of one another, by individual actuating drives (M1 to M4), so that the rolls (3, 7, 8) involved in the printing process can be set against one another,
    - measuring operations being carried out using at least one camera (K), in which intensity values of the light which is reflected at least from image sections of the printing image are picked up successively,
    - the intensity values being fed to a control and regulating unit, and
    - the control and regulating unit generating signals on the basis of the measured intensity values for the actuating drives at least some of the rolls involved in the printing and inking process,
    characterized
    - in that the control and regulating unit generates signals for the actuating drives of at least some of the rolls involved in the printing and inking process
    - until or when the intensity values picked up show or have shown a specific variation.
  2. Method according to Claim 1,
    characterized
    in that light from selected wavelength ranges is picked up.
  3. Method according to one of the preceding claims,
    characterized
    - in that the control and regulating unit generates signals for the actuating drives of at least some of the rolls involved in the printing and inking process
    - until or when the comparison of the intensity values with the intended form of the printing image, which is stored in a memory unit, results in the best agreement.
  4. Method according to one of the preceding claims,
    characterized
    - in that the intensity of the reflected light from various sections (18) of the printing 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) places these difference or contrast values (ki) from sections of the printing image in a relationship with the relative roll positions, it being possible to observe for various sections of the printing image a similar intensity variation or contrast value variation (19) that is typical of the printing process, 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 printing image show or have shown a specific intensity variation or contrast value variation (19).
  5. Method according to one of the preceding claims,
    characterized
    in that the recording of the printing image (10) or at least of parts of the same (10) is performed by using at least one colour camera (K) for the recording.
  6. Method according to one of the preceding claims,
    characterized
    - in that the variation in light intensity or the variation in the contrast values of at least one colour is placed in a relationship with 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 printing image (10) show or have shown a specific colour intensity variation (19).
  7. Method according to one of the preceding claims,
    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 the computing unit transfers these values into another coordinate system, which is based on coordinates derived from the light intensity values or contrast values (19), and
    - in that at least a selection of these coordinates is placed in a relationship with the relative roll positions, 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 printing image (10) show or have shown a specific coordinate variation.
  8. Method according to one of the preceding claims,
    characterized
    in that the values (ki) derived from the light or colour intensity of the reflected light from the printing image are normalized.
  9. Method according to one of the preceding claims,
    characterized
    in that the values (ki) derived from the light or colour intensity of the reflected light of the printing image are plotted against the position of the rolls (3, 7, 8) involved in the printing or inking process and are displayed on a console or a monitor.
  10. Method according to one of Claims 1 to 9,
    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.
  11. Method according to one of Claims 1 to 9,
    characterized
    in that the adjustment of a plurality of printing units is carried out on the basis of one measuring operation.
  12. Method according to one of the preceding claims,
    characterized
    in that the geometric adjustments of the rolls (3, 7, 8) in relation to one another at which the best agreement between the printing image (10) picked up and the intended form of the printing image has been determined,
    and/or until a predefined proportion of the various sections (3, 7, 8) of the printing image show or have shown a specific intensity or contrast variation
    are stored in a memory.
  13. Rotary printing machine, in which the adjustment of its printing image can be performed by adjusting the relative position of the rolls (3, 7, 8) involved in the transfer of ink,
    in which at least some of these rolls (7, 8) can be moved towards one another, both jointly and independently of one another, by individual actuating drives (M1 to M4), so that the rolls (3, 7, 8) involved in the printing process can be set against one another,
    at least one camera (K) being provided, with which measuring operations can be carried out in which intensity values of light reflected at least from image sections of the printing image can be picked up successively,
    a control and regulating unit being provided, to which the intensity values picked up can be fed, the control and regulating unit (13) being designed to generate signals on the basis of the measured intensity values for the actuating drives of at least some of the rolls (3, 7, 8) involved in the printing and inking process,
    characterized
    - in that the control and regulating unit is designed to generate signals for the actuating drives of at least some of the rolls involved in the printing and inking process
    - until or when the intensity values picked up show or have shown a specific variation.
  14. Rotary printing machine according to the preceding claim,
    characterized
    in that by using the camera, various spectral ranges of the reflected light can be picked up.
  15. Rotary printing machine according to the preceding claim,
    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.
EP05022128A 2001-03-27 2002-03-13 Device and method for adjusting the printing image in a flexographic printing machine Expired - Lifetime EP1666252B1 (en)

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EP1249346A1 (en) 2002-10-16
EP1249346B2 (en) 2013-03-06
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CA2379013A1 (en) 2002-09-27
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EP1666252A2 (en) 2006-06-07
DE10145957A1 (en) 2002-10-17

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