Devices and systems for measuring the surface or raised portion of a rotating body.

Abstract

The invention relates to a device for measuring the surface (14) or its elevations (13) of a rotating body (6), such as a flexographic printing plate, the rotating body being designed as a cylinder (15), a roller (15), a sleeve (3) or a plate (5) for a graphics industry machine (8), the device having a first motor (7) and a measuring device (18), the first motor being used to rotate the rotating body (6) about an axis of rotation (22), characterised in that it comprises at least one radiation source (19), at least one area camera (21) and at least one computer (39) and is configured to contactlessly measure surfaces whose measurement is made difficult by their permanent viscosity and / or compressibility and / or porosity using a virtual reference object stored in the computer and to determine the circular run-out accuracy of the rotating body based on the measurement results.

Description

Technical Field

[0001] The invention relates to a device and a system for measuring the surface of a rotating body or its elevations.

[0002] The invention is in the field of graphic arts technology, in particular in the field of measuring rotating bodies, such as cylinders, rollers, sleeves (preferably laser-etched flexographic printing sleeves), or plates, preferably flexographic printing plates mounted on sleeves. During the measurement, the ridges of the rotating body are detected. Background Art

[0003] Document DE 33 02 798 A1 discloses a method for detecting surface coverage or printed areas and non-printed areas in combination with register presetting in order to shorten the setup time.

[0004] Document DE102014215648A1 discloses a rotary printing press having: a central counter-pressing cylinder, which is rotatable about a rotation axis; at least one (preferably a plurality of) printing layers (Druckdeck), which are arranged around the central counter-pressing cylinder, wherein each printing layer has a printing roller provided with a reference mark; and at least one sensor for detecting the reference mark. The sensor is arranged on a separate rotating mechanism, by means of which the sensor can be rotated about the rotation axis.

[0005] Document EP3251850 discloses a so-called mounter for determining the registration data of a sleeve provided with a die and registration marks of a flexographic printing press, the mounter comprising: a shaft on which the sleeve can be fixed; a detection unit (e.g. a 3D scanner) for scanning the surface contour of the die; and a computing unit, in which the scanned surface contour of the die is assigned to a stored rated contour and the registration data is calculated based on this assignment with reference to the registration marks.

[0006] Document DE102006060464A1 discloses a rotary printing press, comprising a plurality of ink layers, at least one of which has a roller (e.g. a flexographic impression roller or an anilox roller), and an adjustment system for adjusting the position of the roller relative to at least another component of the printing press. At least one ink layer has a control unit, which is arranged to receive and process data about the roller, which describe the spatial relationship between the topography of the surface of the specific roller and / or the printing pattern and the reference mark formed on the roller. In addition, the control unit is configured to drive the adjustment system in coordination with these adjustment data, so as to adjust the roller to an optimized position for printing without or at least with reduced waste. The determination or scanning of the topography of the roller surface can be achieved by means of a moving laser head (for laser triangulation or laser interferometry). The goal here is to determine the rated line pressure for the pre-adjustment (or register adjustment) and to avoid the generation of waste based on this. The adjustment values ​​used for this purpose can be stored on a radio frequency identification chip. It is also possible to determine the printing and non-printing areas. The same document DE202007004717U1 discloses rolling scanning as a sensor or measurement based on the shielding principle by means of a laser micrometer as a sensor as an alternative to scanning topography. The same document CN102381013A discloses a method for adjusting a plate cylinder and a pressure roller in a rotary printing press, comprising the following steps: rotatably mounting the plate cylinder; scanning the circumferential surface of the plate cylinder; deriving and storing data for adjusting the plate cylinder; rotatably mounting the pressure roller; scanning the circumferential surface of the pressure roller; deriving and storing data for adjusting the pressure roller from the appearance of the pressure roller surface; and storing the adjustment data; mounting the plate cylinder and the pressure roller in the printing press; and adjusting the plate cylinder and the pressure roller according to the adjustment data.

[0007] The so-called "register and makeready" device sold by the company Bobst is called The systems work with scanning rollers which contact the printing plate to be measured. However, there is a customer desire to measure the printing plate in a contactless manner and thus without damage in all cases, even in the case of very fine printing dots.

[0008] Document WO 2010146040 A1 discloses a similar method, in which a camera and an evaluation algorithm in the form of a setpoint-actual value comparison (measured radius versus theoretical radius) are used.

[0009] Document WO2008049510A1 discloses a method and a device for checking the quality of at least one impression cylinder. This allows the necessary quality assurance measures to be carried out automatically, i.e. the impression cylinder is transferred to a testing device, in which the surface of the impression cylinder is optically scanned in an automated manner and the diameter or circumference of the impression cylinder and / or the surface roughness of its surface are measured by means of an automated measuring device. For example, the printed image is checked based on its ink density.

[0010] DE 10 20 20 11 1 341 A1 published later discloses a device and a system for measuring the surface of a rotating body or its ridges. For contactless measurement of the surface, the measuring device comprises at least one radiation source and at least one area camera. WO 2008 / 049510 A1 discloses a similar method.

[0011] In printing with flexible printing plates or printing sleeves (liners) that are colored by an anilox roller and mounted on a sleeve, a number of variable parameters are known: changes in the size parameters of the anilox roller (i.e. its circumference); changes in the strength of the printing plate in relation to the working width and in the unwinding; changes in the sleeve in relation to the working width and in the roundness; eccentricity; changes in the mounting of the printing plate by means of adhesive tape. The working pressure between the anilox roller and the impression cylinder (with sleeve, rubber surface and printing plate) and between the impression cylinder and the counter cylinder (with the printing material located therebetween) and thus the printing result can be influenced by these changes and in particular impaired.

[0012] Therefore, a variety of systems for measuring are known. Nevertheless, the market constantly demands innovations, in particular in order to be able to produce higher quality printed products more quickly and more cost-effectively. The known systems cannot always fully meet this demand.

[0013] In particular, problems arise when the surface to be measured is sticky and / or adhesive, so that mechanical scanning or tactile measurement methods are not possible or can only be carried out with difficulty. Summary of the invention

[0014] The object of the present invention is therefore to provide an improvement over the prior art, in particular to allow rapid and high-precision measurement of rotating bodies, such as ridges of a flexible printing sleeve provided with an adhesive layer or flexographic printing dots of a flexographic printing plate.

[0015] The solution of the present invention:

[0016] According to the invention, this object is achieved by a device and a system according to a preferred embodiment of the invention. Advantageous and therefore preferred further embodiments of the invention are apparent from the optional embodiments as well as from the description and the drawings.

[0017] The present invention proposes a device for measuring the surface of a rotating body, such as a flexible printing plate mounted on a sleeve, or its ridges, wherein the rotating body is configured as a cylinder, roller, sleeve or plate for a graphics industry machine, in particular a printing press, and wherein the device has a first motor and a measuring device, wherein the first motor is used to rotate the rotating body around a rotation axis, and is characterized in that the measuring device includes at least one radiation source, at least one area camera and at least one computer and is configured to contactlessly measure a surface whose measurement is made difficult by its permanent viscosity and / or compressibility and / or porosity using a virtual reference object stored in the computer and to determine the circular runout accuracy or concentricity accuracy of the rotating body based on the measurement results.

[0018] Area cameras differ from line cameras in that not only one-dimensional, light-sensitive line sensors but also two-dimensional, light-sensitive area sensors are present, wherein the area sensor preferably comprises a plurality of line sensors. An area camera can be formed from several, for example adjacent, line cameras.

[0019] The surface camera can be a plurality of surface cameras arranged side by side. The surface camera can be arranged fixedly or movably in the axial direction (preferably in the horizontal direction) (relative to the roller or the supporting roller or its axis) and / or the surface camera can be arranged fixedly or movably perpendicular to the axis (preferably in the vertical direction).

[0020] The use of an area camera allows very fast and at the same time very precise measurement, in particular of surfaces which are viscous and / or in particular permanently viscous and / or adhesive and / or hot (e.g. above room temperature, or above 50 degrees Celsius) and / or magnetic and / or porous and / or (in addition to the elevations) structured / rough and / or mirrored and / or transparent and / or partially transparent and / or smooth and / or hard and / or compressible, so that mechanical or tactile / contact measurement is significantly difficult or unsuitable. In the present application, such surfaces are referred to as "surfaces that make measurement difficult" (alternatively "surfaces that interfere with measurement"). Here, "permanently viscous" means that the surface is not only temporarily and / or occasionally viscous, but that the surface is provided with a functional and sufficiently permanent viscous property for the desired non-interfering function. For this function, the sleeve with the function of carrying the flexographic printing plate is preferably designed to be permanently viscous and can also be compressible and / or porous.

[0021] The device of the invention enables contactless measurement and advantageously avoids possible damage to the object to be measured, in particular to the soft printing points of a flexographic printing plate. Furthermore, measurement by means of radiation, in particular electromagnetic radiation such as light, allows very fine measurements, which is particularly advantageous when measuring fine printing points of a flexographic printing plate.

[0022] In use, such a device allows, for example, the automatic measurement of a mounted printing plate or a mounted flexographic printing plate or a printing sleeve or a flexographic printing sleeve in a mount and thus the automatic presetting of a correspondingly optimized operating pressure between the cylinders and / or rollers involved in the printing process (e.g. anilox roller, impression cylinder with printing plate and counter cylinder). A uniform printed image is obtained at the optimized operating pressure. Advantageously, downtimes and start-up waste can be reduced or even avoided by presetting, for example in the case of a change in print order.

[0023] This device also allows the optimized working pressure, the optimized printing speed and / or the optimally adapted dryer power to be dynamically adjusted in relation to the production speed during use, so that high-quality printed products can be produced industrially (automatically, with little personnel input and advantageously).

[0024] In the absence of data technology networking and / or in the case of a large spatial distance between the prepress phase (e.g. the production of flexographic printing plates) and the printing phase (e.g. printing with a flexographic printing press), the device of the present invention can be used locally to: quickly and accurately generate and provide all values ​​required for local high-quality printing (e.g. operating pressure, printing speed and / or dryer power).

[0025] One application could be the measurement of printing rollers or printing sleeves in the printing industry. Another application could be the quality check of the interacting embossing rollers (so-called "male" and "female" rollers); here, it is also possible to determine how well the two rollers roll against each other, i.e. the "male" and "female" fit together, and algorithms can check the usability of the two rollers. Another application could be the measurement of compressible rubber rollers.

[0026] Due to the contactless measurement, the present invention offers many advantages over contact / tactile methods: non-destructive measurement, no influence on the workpiece to be measured, measurement of, for example, hot surfaces (hot embossing rollers), checking of "male" / "female" workpieces by means of analysis and processing algorithms, simple assembly, measurement of, for example, magnetic workpieces and / or dynamic observation / measurement of workpieces that are affected by environmental influences (temperature, air humidity, etc.).

[0027] Preferably, a virtual reference object is newly generated in each measurement. Here, the process is preferably carried out in the following manner:

[0028] 1. Position the object to be measured (plate, sleeve, and / or roller; or rotating body).

[0029] 2. At least one camera automatically detects the diameter of the object to be measured. The outer diameter is determined by a first masking process over the measuring width. The rotor rotates.

[0030] 3. Move a reference object, such as a wire, into the camera field of view.

[0031] 4. Wait until the wire is still (virtually no vibration).

[0032] 5. Use the at least one camera to record the position of the wire and store it in a computer (for example, together with the measured object, that is, there is an instantaneous recording of the measured object and the reference object).

[0033] 6. Remove the reference object from the field of view of the at least one camera.

[0034] 7. Start the measuring process taking into account the positions stored in the computer.

[0035] Exemplary workpiece measurements:

[0036] i) The workpiece is inserted into the scanner, but the cylinder is also measured in addition to the sleeve. The receiver can be an air spindle, but also a conical tensioning system.

[0037] ii) After loading, the actual scanning process is started, which detects the surface structure.

[0038] iii) After the scanning process, an algorithm is implemented which detects relevant measurement data, such as roundness. It is irrelevant what surface the cylindrical body has, which can be magnetic, thermal, porous, transparent, translucent, mirror-like, etc., for example.

[0039] iv) The system can process identification features present on the object to be measured.

[0040] v) The system displays the ascertained measurement results and can carry out a setpoint-actual comparison.

[0041] vi) The measuring device provides the acquired data as a server or cloud solution, for example in a database. The data processing device can process the data of the server or cloud.

[0042] vii) After this measuring process, the workpiece to be measured is removed and a new cylindrical object can be measured.

[0043] From today's point of view, imaging methods or sensor devices based on electromagnetic waves are advantageous. An alternative is to use LIDAR sensors (LIDAR = light detection and ranging), that is, sensors that determine distances on the basis of the propagation time of light.

[0044] Further aspects of the present invention:

[0045] A preferred further embodiment of the present invention can be characterized in that the measuring device includes a reference object for contactless measurement. The reference object can preferably be a tensioned metal wire (axially parallel to the rotating body). When measuring the ridges of the surface, the reference object is used as a reference. The reference object or at least its (axially parallel) contour can be detected together by the surface camera. In the case of the preferred application of multiple adjacent surface cameras, the images of the individual cameras can be advantageously oriented to each other with the aid of the reference object or its corresponding imaging (in the camera image). Therefore, high-precision and therefore time-consuming orientation of the camera is not required. Another advantage is obtained in the following way, namely: when using and detecting the reference object together, the amount of data to be processed can be significantly reduced.

[0046] A preferred further development of the invention can be characterized in that a second motor is present, which enables the measuring device to be adjusted perpendicularly to the axis of rotation.

[0047] A preferred further development of the invention can be characterized in that the second motor adjusts (preferably not only the measuring device but also preferably the reference object) perpendicularly to the axis of rotation.

[0048] A preferred further development of the present invention may be characterized in that a further second motor adjusts the reference object perpendicularly to the rotation axis. The further second motor is not the aforementioned second motor, ie, there are two independent second motors.

[0049] A preferred further development of the invention can be characterized in that the radiation source, in particular the light source, irradiates, in particular illuminates, at least one region of the surface.

[0050] A preferred further development of the invention can be characterized in that the reference object is parallel to the axis of rotation, in particular does not move during the measurement. The reference object can be arranged fixed in place, for example a wire can be tensioned fixed in place at its two ends.

[0051] A preferred further development of the invention can be characterized in that the reference object is a linear object, which is stretched parallel to the axis of rotation; or the reference object is an object with an edge, or a beam. The object with an edge can be a knife-shaped object. The edge of the edge or the beam serves as a reference line for the reference object.

[0052] A preferred further development of the invention can be characterized in that the reference object is a tensioned string, or a tensioned metal wire, or a tensioned carbon fiber. Preferably, a tensioned metal wire is used. The tensioned metal wire has shown in a large number of tests to be a feasible and sufficiently accurate technical solution. Possible vibrations of the metal wire during the measurement can be compensated in an algorithmic manner. In a slightly less preferred application of the above-mentioned knife or beam, it may be necessary to compensate for thermal changes (expansion or thermal expansion and contraction) in the structure. This compensation by algorithmic technology and therefore the use of metal wires are preferred due to the low cost.

[0053] A preferred further development of the invention can be characterized in that a third motor is present, which moves the radiation source, in particular the light source, and the camera parallel to the axis of rotation. The radiation source, in particular the light source, can form a structural unit with the camera, in particular be integrated into the camera.

[0054] A preferred further embodiment of the invention may be characterized in that the measuring device comprises at least one reflector. The reflector may extend over the axial length of the carrier roller. The reflector may be arranged in a fixed position. The reflector may be a foil that produces specular reflection or produces scattered light (white noise).

[0055] A preferred further development of the invention can be characterized in that the camera records at least one common image, image sequence or common film of an axial region of the contour of the rotating body and the same axial region of the reference object or its contour, in particular its contour facing the contour of the rotating body. Another advantage is that the amount of data to be processed can be significantly reduced in the use and joint detection of the reference object, preferably its contour. The (radial) distance between the elevation (or its contour) and the reference object (or its contour facing it) that can be discerned in the image can be used for the calculation of the (radial) height of the elevation of the stamp based on digital image processing.

[0056] A preferred further development of the invention can be characterized in that a computer is present, which evaluates the images, the image sequence or the film and determines the radial spacing between the elevations of the surface and the axis of rotation. The image sequence or the film can include, for example, 1 or up to 10 or up to 100 images per 1 mm of the circumference of the rotating body. The resolution in the axial direction can be between 10,000 pixels and 100,000 pixels, for example 1,280 pixels times 30 cameras, i.e. 38,400 pixels.

[0057] It can be provided that so-called KI techniques are used. This KI technique can be used together with or independently of data evaluation of large data volumes (large surfaces to be measured and high resolution), for example, in the case of determining feed values ​​for the AS and BS print feed. This KI technique can be learned based on data evaluations that have already been carried out.

[0058] The features of the present invention, the further solutions of the present invention and the embodiments of the present invention can also constitute advantageous further solutions of the present invention in any combination with each other. In addition, the further solutions of the present invention can have individual features or feature combinations disclosed in the above-mentioned "technical field" and other paragraphs. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The present invention and its preferred further embodiments are further explained below with reference to the drawings by means of preferred embodiments. Corresponding features are provided with the same reference numerals in the drawings. In the drawings:

[0060] Figures 1 to 5 : Views showing preferred embodiments of the device of the present invention and details thereof. DETAILED DESCRIPTION

[0061] Figure 1 The cross section of the measuring station 2 shows a rotatable support cylinder 1, a sleeve 3 received on the support cylinder and a (so-called) "mount" received on the sleeve and preferably fixed to the sleeve by means of an adhesive tape 4 (or alternatively by means of an adhesive coating of the sleeve), a printing plate 5 to be measured at least in terms of its topography as a rotating body 6. Alternatively, a preferably laser-etched printing sleeve can be measured on the support cylinder. The surface of the sleeve and / or the printing plate can be a surface that makes the measurement difficult, for example due to the presence of an adhesive tape or the presence of an adhesive coating, in particular in the case of exposed adhesive sections.

[0062] In order to rotate the carrier roller during the measurement, a motor 7 may be present in the measuring station. The measuring station may be part of a so-called "mounter" (in which the printing plate is mounted on the carrier sleeve) or may be arranged independently of the "mounter". The measuring station may be arranged independently of a printing press 8, which is provided with at least one printing mechanism 9 for the printing plate 5 and a dryer for printing and drying a preferably web-shaped printing material 11. The printing press is preferably a flexographic printing press and therefore the printing plate is preferably a flexographic die, for example with a diameter of 106 mm to 340 mm. The dryer is preferably a hot air dryer and / or an ultraviolet dryer and / or an electron beam dryer and / or an infrared dryer. The sleeve can be pushed onto the carrier roller from the side. The carrier roller may have openings in its circumference, from which compressed air can be ejected for expanding the sleeve and for generating an air cushion during the push. The sleeve with the printing plate can be removed from the measuring instrument after the measurement and pushed onto the impression cylinder of the printing mechanism in the printing press. As an alternative to a pneumatic tensioning system, a hydraulic tensioning system can also be used.

[0063] The calibration of the measuring station 2 can be carried out with the aid of the measuring ring 12 on the carrier roller 1. Alternatively, the measuring sleeve or the carrier roller itself can be used for the calibration.

[0064] The following figures show the device of the present invention (see Figure 2c ) for contactlessly measuring elevations 13 of a surface 14 of a rotating body 6, which is designed as a cylinder, roller, sleeve or plate of a printing press 8. These elevations can be, for example, flexible printing dots (in the case of a grid) or flexible printing surfaces (in the case of a full plate) of a flexographic printing plate. In the following exemplary embodiments, the measurement of a printing plate 5 is described by way of example. By measuring the printing plate 5, the corresponding optimized working pressures between the cylinders involved in the printing process (for example, anilox cylinder 15, impression cylinder 16 with printing plate 5 and counter cylinder 17) can be automatically preset.

[0065] Figures 2a to 2c A preferred embodiment of the device for measuring the topography of a printing plate 5 of the present invention is shown; Figure 2a A cross section is shown; Figure 2b A top view is shown; Figure 2c Show Figure 2a According to this embodiment, the topography is detected preferably by means of a plurality of devices 18 within the scope of 3D radius determination by means of optional reference lines.

[0066] In this and subsequent embodiments, "2D" means: scanning a segment of the printing plate 5 (e.g. annular height profile), and "3D" means: scanning the entire printing plate 5 (e.g. a cylindrical height profile composed of annular height profiles).

[0067] The device comprises a plurality of radiation sources 19 (in particular light sources 19, preferably LED light sources), at least one reflector 20 and at least one light receiver 21 (preferably an area camera and particularly preferably a high-speed camera). In the following, the radiation source is exemplarily based on a light source, that is, emitting visible light. Alternatively, the radiation source can emit other electromagnetic radiation, such as infrared. These light sources are preferably arranged in a row perpendicular to the rotation axis 22 of the carrier roller 1 and generate a light curtain 23, wherein the carrier roller 1 with the sleeve 3 and the printing plate 5 generates a shielding 24 (that is, a contour). The reflected and subsequently received light 25 (that is, essentially the emitted light 23, without the light 24 shielded by the topography 13) carries information about the topography 13 to be measured. The reflector 20 can be configured as a reflective foil.

[0068] The light source 19 is planar (area camera). The light source preferably emits visible light. Preferably, the light source 19 and the light receiver 21 cover the working width 26, that is, the extension of the printing plate 5 in the direction of its axis 22 (for example 1650 mm). Preferably, n light sources 19 and light receivers 21 can be provided, wherein, for example, 69>n>2. In the case of using smaller-sized cameras, a larger upper boundary than 69 may be required. If the entire working width 26 is covered, the printing plate 5 can be measured during one revolution of the carrier roller 1. Otherwise, the light source and the light receiver must move along the printing plate in the axial direction 27 or have a beat.

[0069] Preferably, a powerful but fast-working camera 21, such as a black-and-white camera, is used. These cameras can take single images or films during the rotation of the printing plate 5.

[0070] The arrangement consisting of the light source 19, the reflector 20 and the light receiver 21 can preferably be moved in a direction 28 perpendicular to the axis 22 of the support roller 1, so that the generated light strip 23 is directed toward the feature 13 to be measured. For this purpose, a motor 29 can be provided. It can also be provided that the reflector is designed in a fixed manner and only the light source and / or the light receiver are moved (for example, moved by a motor).

[0071] Contrary to the illustration, the measurement of the topography 13 is preferably carried out in a vertical direction (e.g. the camera is "down" and the reflector is "up") and not in a horizontal direction, since in this case any sags of the support roller 1 and the reference object 30 can be left out of account. In this preferred solution, it is necessary to assume that Figure 2a Rotate 90° in a clockwise direction.

[0072] As an optional reference object 30, a linear object 30 is provided, preferably a tensioned wire 30 or a tensioned string 30, for example a metal wire or carbon fiber, or a knife (or a knife-like object or an object with an edge) or a beam, which generates a reference line 31 for a plurality of light receivers 21. The linear object preferably extends parallel to the axis of the support cylinder 1 and is arranged at a small distance 32, for example 2 mm to 10 mm (up to 20 mm) from its circumference 33 (or from the printing plate 5 arranged on this circumference 33). The received light 25 also contains analyzable information about the reference object 30, such as its location and / or distance from the surface 14 of the printing plate 5 (preferably etched and therefore deeper than the elevation 13). With the help of the reference line, preferably using digital image processing, the radial distance R of the topography 13 (or contour or contour elevation) from the reference object 30 can be determined. The distance between the reference object 30 and the axis 22 of the support roller 1 is known by the arrangement and / or motorized displacement of the reference object 30 (optionally together with the light source 19 and the light receiver 21 and, if necessary, the reflector 20). The radial distance between the contour elevations (i.e., the radius R of the printing point) can thus be determined in an algorithmic manner. By using the reference object 30 and thus by the presence of the mask caused thereby or of a reference line 31 corresponding to the mask for each camera 21 (in the captured image or based on the received light), an exact (e.g., pixel-accurate) orientation of the cameras relative to one another is not absolutely necessary. Furthermore, the reference object 30 can be used to calibrate the measuring system.

[0073] The reference object 30 can be coupled to the light source 19 and / or the motor 29 for the movement or adjustment along the direction 28. Alternatively, the reference object can have its own motor 29b for the movement / adjustment.

[0074] For initial reference of the device, a measurement is preferably carried out with the aid of a (“empty”) carrier roller or a measuring sleeve arranged thereon (measuring the distance between the reference object and the surface, from AS to BS).

[0075] In order to further initialize the device before the measuring process, it is preferred to first move the surface camera 21 in the direction 28 toward the support roller 1. Preferably, the movement is stopped as soon as the camera preferably detects the first ridge. Subsequently, the reference object 30 is preferably also moved in the direction 28 to a predetermined distance (e.g. 2 mm) from the support roller 1.

[0076] Alternatively, the light source 19 and the light receiver 21 can also be arranged on opposite sides of the support roller 1 ; in this case, the reflector 20 can be omitted.

[0077] Preferably, the light source 19 , the reflector 20 (if present according to the embodiment), the light receiver 21 and the optional reference object 30 form a unit 34 which is movable (perpendicular to the axis 22 of the support roller), in particular adjustable or displaceable by a motor.

[0078] During the measurement, the carrier cylinder 1 with the printing plate 5 located thereon rotates so that preferably all elevations 13 can be detected along the circumferential direction 35. As a result, a topographic image and the radius R or diameter D (measured between opposite elevations) of individual elevations 13, such as flexographic printing dots, relative to the axis 22 can be determined as a function of the angular position of the carrier cylinder 1.

[0079] exist Figure 2c The enlarged view of FIG. 5 shows a detail of the topography 13 of the printing plate 5 and it is possible to recognize the shadows 24 of the topography and the shadows 36 of the reference object 30. These topography elevations 13 can be in the range of 2 μm to 20 mm.

[0080] Furthermore, a sensor 37 may be provided which detects a detection feature 38 (see Figure 2b ) detection sleeve 3 and / or printing plate 5. The feature may be, for example, a barcode, a two-dimensional code (such as a QR code or a data matrix code), a radio frequency identification chip or an NFC (near field communication) chip.

[0081] The signals and / or data generated by the light receiver 21, which include information about the topography 13 of the measured surface 14 and about the reference object 30, are preferably transmitted via a line or via a radio connection to a computer 39 and further processed there. The computer is connected to the printing press 8. The computer 39 evaluates this information.

[0082] Reference object 30 can be placed in the detection area of ​​light receiver 21 before measurement in order to calibrate the light receiver. Light receiver 21 detects the reference object and transmits the generated calibration signal to computer 39. The calibration data are recorded in digital memory 40 of computer 39.

[0083] It is thus possible to store a virtual reference object in computer 39. Reference object 30 is then removed from the detection region of light receiver 21 and measured topography 39 of surface 14 is further processed together with the virtual reference object.

[0084] The results of the evaluation are stored in a digital memory 40 of a computer, in a memory 40 of a printing press, or in a cloud-based memory. These results are preferably stored in association with the corresponding identification features 38. During the subsequent use of the printing plate 5 (or printing sleeve / flexographic printing plate) mounted on a sleeve in a printing press 8, the identification features 38 of the printing plate 5 (or printing sleeve / flexographic printing plate) can be read in again. The values ​​stored for the identification features 38 can then be called up (for example for presetting purposes). For example, it can be provided that the printing press obtains the data required for the print job from a cloud-based memory.

[0085] The result of the analysis and processing may preferably include up to four values: the pressure feed of the impression roller 16 (i.e. the roller carrying the measured printing plate 5) on both sides 41 or AS (drive side) and 42 or BS (operating side) relative to the counter roller 17 (or printing material transport roller 17) in accordance with operating requirements, and the pressure feed of the anilox roller 15 that colors the measured printing plate 5 relative to the impression roller 16 on both sides 41 or AS (drive side) and 42 or BS (operating side) in accordance with operating requirements.

[0086] Furthermore, a device 43 for detecting the point density, for example by optical scanning, can be provided, preferably a laser triangulation device, a CIS scanning strip (contact image sensor) or an area camera. Alternatively, the device 43 can be a swiveling or movable reflector, so that it can be used together with the light source 19, 21 to measure the point density. The device is preferably connected to a device for image processing and / or image analysis, which is preferably a computer 39 (or a computer 39 with corresponding programming) or can be another computer 39b.

[0087] The CIS scanning strip can be arranged axially parallel to the cylinder. The CIS scanning strip preferably includes an LED for illumination and a sensor for image capture (similar to the scanning strips in commercially common copiers). Such a strip is preferably arranged or positioned at a distance of 1 to 2 cm from the surface. A cylinder with a surface to be measured, such as a printing plate, rotates under the strip, which generates an image of the surface and provides it to an image analysis process for dot density analysis. The data obtained by the detection of the dot density can also be used, for example, to select or recommend an anilox roller (optimized for printing with the detected stamp) in an algorithmic manner based on a plurality of provided anilox rollers.

[0088] Figure 3a and 3b A preferred embodiment of the device for measuring the topography of a printing plate 5 of the present invention is shown; Figure 3a Showing a cross section, Figure 3bAccording to this embodiment, the topography is detected, preferably by means of a laser micrometer 44 , within the scope of the 2D diameter determination.

[0089] The device comprises a light source 19, preferably a line LED light source 19 or a line laser 19, and a light receiver 21, preferably a line camera 21. The laser and the light receiver together form a laser micrometer 44. The light source 19 generates a light curtain 23, and the carrier cylinder 1 with the sleeve 3 and the printing plate 5 generates a mask 24. The line length of the light source 19 and the light receiver 21 is preferably greater than the diameter D of the carrier cylinder together with the sleeve and the printing plate, so that the topography can be obtained without a movement of the device 44 perpendicular to the axis 22 of the carrier cylinder. In other words: the cross section of the carrier cylinder is completely located in this light curtain.

[0090] The arrangement 44 consisting of the light source 19 and the light receiver 21 can be moved parallel to the axis 22 of the support roller (in the direction 27) in order to detect the entire working width 26. A motor 45 can be provided for this purpose.

[0091] A sensor 37 may be provided which detects the presence of a recognition feature 38 (see Figure 2b ) sleeve 3 and / or printing plate 5.

[0092] The signals and / or data generated by the optical receiver 21 are preferably transmitted via a line or via a radio connection to a computer 39 and processed further there. The computer is connected to the printing press 8 .

[0093] Alternatively, the light source 19 and the light receiver 21 can also be arranged on the same side of the carrier roller 1; in this case, similar to Figures 2a to 2c As in the embodiment of the present invention, a reflector 20 is arranged opposite thereto.

[0094] According to an alternative embodiment, the topography is preferably detected within the scope of 2D diameter determination by means of a laser micrometer 44, wherein not only individual measurement lines 46 but also a wider (shown in dashed lines) measurement strip 47 consisting of a plurality of (shown in dashed lines) measurement lines 48 is detected. In this exemplary embodiment, the light source 19 and the light receiver 21 are preferably designed in a planar manner and not just in a line-shaped manner. The light source 19 can include a plurality of light lines 48, each of which has a width of approximately 0.1 mm and a corresponding spacing of approximately 5 mm from one another. In this example, the camera is preferably designed as an area camera.

[0095] Figures 4A and 4B show a preferred embodiment of the device of the present invention for measuring the topography of a printing plate 5; Figure 4A shows a cross section and Figure 4B shows a top view. According to this embodiment, the topography is preferably detected within the scope of 2D radius determination by means of a laser micrometer.

[0096] The device comprises a light source 19, preferably an LED light source 19, and a light receiver 21, preferably a line-shaped LED light source 21 or a line-shaped laser 21. The light source 19 generates a light curtain 23 and the support cylinder 1 with the sleeve 3 and the printing plate 5 generates a mask 24.

[0097] The arrangement consisting of the light source 19 and the light receiver 21 can preferably be moved in a direction 28 perpendicular to the axis 22 of the support roller 1 in order to direct the light curtain 23 toward the feature 13 to be measured. For this purpose, a motor 29 can be provided. In the case where the light curtain 23 is wide enough and thus covers the measurement area, the motor 29 can be omitted.

[0098] The signals and / or data generated by the light receiver 21 are preferably transmitted via a line or via a radio connection to a computer 39 and further processed there. The computer is connected to the printing press 8. Alternatively, the light source 19 and the light receiver 21 can be arranged on the same side of the carrier cylinder; in this case, similar to Figures 2a to 2c As in the embodiment of the present invention, a reflector 20 is arranged opposite thereto.

[0099] According to an alternative embodiment, the topography 13 is detected within the scope of the 3D radius determination, preferably by means of a laser micrometer 44, wherein not only the measuring line 46 but also a wider (shown by dashed lines) measuring strip 47 is detected, i.e., a plurality of measuring lines 48 are detected simultaneously. In this exemplary embodiment, the light source 19 and the light receiver 21 are designed to be planar and not just line-shaped.

[0100] According to another alternative embodiment, the topography 13 is detected within the scope of 3D radius determination, preferably by means of a laser micrometer 44, wherein the arrangement consisting of the light source 19 and the light receiver 21 can preferably be moved in a direction 28 perpendicular to the axis of the support roller 1 in order to direct the light curtain 23 toward the topography 13 to be measured. For this purpose, a motor 29 (shown in dashed lines) can be provided.

[0101] According to an alternative embodiment, the topography 13 is detected within the scope of the 3D radius determination, preferably by means of a laser micrometer 44 , wherein the last two alternative embodiments described above are combined.

[0102] Figure 5 An exemplary and greatly enlarged topographic measurement result of a printing plate 5 is shown, comprising two printing areas 50 and two non-printing areas 51. Here, the radial measurement result for 360° is shown at an axial position (with respect to the axis of the carrier cylinder). These non-printing areas can be produced, for example, by etching and therefore have a smaller radius than the printing areas.

[0103] The illustration also shows the radius 52 of the envelope or the envelope 52 of the point of the printing plate 5 having the largest radius, ie the highest elevation of the topography 13 at the axial position.

[0104] The dot 53 of the printing plate 5 is a printing dot because it has sufficient contact with the printing material and with the ink-transmitting anilox roller during printing operation at the pressure (or printing feed) normally set between the printing plate 5 and the printing material 11 or the transport cylinder 17. The normally set pressure produces a so-called kiss print, in which the printing plate just touches the printing material and in which the flexible printing dots are not significantly damaged.

[0105] Point 54 is a point which is still printed during printing operation at the normally set press, since it is still in contact with the printing material.

[0106] These two dots 55 are dots that are not to be printed, since during printing operation, at the conventionally set nip level, these dots 55 do not come into contact with either the printing material or the anilox roller.

[0107] A computer program runs on the computer 39, which determines the radially deepest point 56 and its radial spacing 57 from the envelope 52 in the printing area 50 in a computationally-technical manner, for example using digital image processing. This calculation is performed at regular intervals in the axial direction, for example from AS to BS at all measuring points, and the respective maximum values ​​(i.e. the deepest values) from AS to the center and from the center to the deepest point of BS are determined. These two maximum values ​​or the feed values ​​or setting values ​​thus determined in a computationally-technical manner can be selected, for example, in printing as a corresponding feed / adjustment for AS and BS, i.e.: the cylinder spacing between the cylinders involved in printing is reduced by this feed for AS and BS. For this purpose, a motor-driven lead screw can be used from AS and to BS.

[0108] Here are some specific numerical examples:

[0109] On one side this results in a distance ΔR=65 μm, on the other side a distance ΔR=55 μm. In order to print all dots 53 to 55 of printing plate 5 , an advance of 65 μm is necessary.

[0110] In all the embodiments shown and the alternatives mentioned therein, the production-related and / or operation-related (due to wear) runout accuracy of the sleeve 3 can be additionally measured and, based on the measurement and evaluation results, can be taken into account in printing to improve the quality of the resulting printed product. In the event of a predefined runout tolerance being exceeded, a warning can be output. This measurement can be carried out both in the case of a smooth sleeve and in the case of a porous sleeve.

[0111] In all the embodiments shown and the alternatives mentioned therein, the printing plate 5, in particular its polymer material, can additionally be measured for production-related thickness fluctuations and / or distortions thereof (in particular due to mounting on a sleeve) and / or dust and / or hair or airborne impurities (between sleeve and mounted printing plate) and / or existing elevations caused by the adhesive surface 4 and / or temperature influences (thermal expansion). Dust particles and their position can be determined individually by topographic detection. The individual dust particles can be displayed to the operator, for example, by a laser dot / a laser cross projected on the printing plate 5, for removal. Alternatively, a dust removal device can be moved to the position of the dust particles and the dust particles can be removed, for example, by air jets or by means of rollers.

[0112] Instead of a light source 19 or a light transmitter 19 (which emits visible light), a radar transmitter 19 (with a correspondingly adapted receiver) can also be used within the scope of the invention.

[0113] In all the embodiments shown and the alternatives mentioned therein, parameters for a dynamic pressure feed can also be determined and sent to the printing press. For example, a known (e.g. measured in advance) and available to the computer 39 hysteresis extension of the deformable and / or compressible printing dots 53 to 55 made of polymer material can be taken into account. Alternatively, the hardness of the printing plate determined in advance by means of a hardness tester can be used. This extension can be particularly dependent on the printing speed that prevails in accordance with the operating regulations, or this printing speed dependency can be taken into account. For example, a higher pressure feed can be selected at a higher printing speed.

[0114] Here, the printing surface or dot density of the printing plate 5 can also be taken into account (instead of or in addition to the printing speed), that is: the variable location density of the printing dots on the printing plate 5: for example, a higher pressure feed can be selected in the case of a higher dot density, and / or the dot density can be used when adjusting the dynamic pressure feed.

[0115] To determine the local point density, received light 25 may be used, ie essentially emitted light 23 without light 24 obscured by feature 13. This light carries information about feature 13 to be measured and / or its surface point density and / or its elevations.

[0116] For this purpose, a device 43 can also be provided for detecting or measuring the dot density, i.e. its local or local value, on a stamp, such as a flexographic printing plate, which device is preferably a CIS scanning strip or an area camera. For example, it can be provided that, based on the data obtained / calculated by the dot density determination, predetermined values ​​for different pressure feeds on the AS (drive side of the printing press) and the BS (operating side of the printing press) are provided.

[0117] Knowing the dot density of the printing plate 5 and / or the inked anilox roller 15 and / or the anilox sleeve 15, the expected ink consumption when printing on a given printing material 11 with the printing plate 5 can be determined in a computational manner. From this ink consumption, the required dryer power of the dryer 10 for drying the ink on the printing material can be determined in a computational manner. Based on the calculated, expected ink consumption, the ink reserve to be provided can also be calculated.

[0118] In all the embodiments shown and the alternatives mentioned therein, so-called channel impact patterns can also be taken into account. A channel impact pattern is a disturbance that occurs periodically during the rotation of the printing plate 5 in accordance with the operating regulations, which is caused by a vacancy or channel (i.e., a large interfering area or other axial channel without a printing point) with a page width or at least an interfering width (mostly extending in the axial direction) in the printed image. Such a channel or its channel impact pattern may impair the printing quality, because the cylinders involved in the printing are close and collide rhythmically by kissing and pressing in the channel area that is repeatedly passed during rotation. This may lead to undesirable density fluctuations or even printing interruptions in unfavorable circumstances. The existing channel impact pattern can preferably be detected by means of a CIS measuring device 43 (e.g., the above-mentioned swingable or movable mirror together with a surface camera) or by means of a surface camera and analyzed in a computational manner, and compensated in the pressure feed required in accordance with the operating regulations. For example, it can be pre-calculated based on the detected channel impact pattern: at what speed (or rotation frequency) of the printing press, vibrations will occur. These speeds or rotation frequencies are then not applied during production and are exceeded, for example, when the machine is started.

[0119] Each printing plate 5 can have an individualized channel impact pattern. Channels in the stamp can adversely affect the printing result or even lead to printing interruptions. In order to reduce or completely eliminate channel impacts, the printing plate is checked with respect to the channels along the unfolding direction. Knowing the resonance frequency of the printing mechanism 9, it is possible to calculate production speeds that are particularly unfavorable for a given stamp. These printing speeds should be avoided as appropriate (so-called "no go speeds").

[0120] In all the embodiments shown and the alternatives mentioned therein, the register mark (or multiple register marks, such as wedges, double wedges, dots or crosshairs) on the stamp can also be detected (for example using a camera 21 or 43 and using a post-placed digital image processing device) and its position can be measured, stored and prepared. As a result, the register regulator or its register sensor can be automatically adjusted to the register mark or axial position. This can advantageously prevent errors due to the otherwise usually manual adjustment of the sensor. Alternatively, the pattern can be detected and used for the configuration of the register regulator. It can also be provided that the register sensor movable by motor means is automatically positioned (especially in the axial direction). It can also be provided that the predetermined zero point of the angular position of the impression cylinder and / or the printing sleeve arranged thereon is compared with the angle value of the actual location of the printed image (for example by manual bonding), especially along the circumferential direction (or the circumferential direction of the cylinder / sleeve). Based on this comparison, an optimized initial value for the angular position of the cylinder / sleeve can be obtained. In this way, printing production can be started with a reduced register deviation. This also applies correspondingly to the transverse direction (or transverse direction of the drum / sleeve).

[0121] In all the embodiments shown and their mentioned alternatives, the power of the dryer 10 of the printing press 8 can also be controlled or regulated. For example, LED dryer sections can be switched off in areas where no printing ink is transferred to the printing material, thereby enabling advantageous energy saving and life extension of the LEDs.

[0122] Advantageously, the power of the dryer 10 (or the power of individual sections of the dryer) can be reduced for printing areas with a low dot density on the printing plate. This can save energy and / or extend the service life of the dryer or individual sections. This switching off or reduction can be done on the one hand regionally and on the other hand in a direction parallel to and / or transverse to the axial direction of the printing plate (or the transverse direction of the printing material to be processed therewith). For example, dryer sections or modules can be switched off in areas corresponding to gaps between printing plates (for example, arranged at a distance from one another, in particular manually glued).

[0123] In all of the illustrated embodiments and their mentioned alternatives, the corresponding location (on the printing plate 5 ) of the measurement error can also be detected for a print inspection system and made available for further use, for example a local adjustment of such a print inspection system.

[0124] In all the embodiments shown and the alternatives mentioned therein, an online or inline ink measuring system can also be positioned. To determine the location and thus the position of the online ink measurement, an image and / or pattern recognition is performed, based on which the axial position for the measuring system is determined. In order to be able to realize free areas for calibration with respect to the printing material, the free printing areas can be communicated to the online ink measuring system.

[0125] An exemplary overall process will be described below which can be carried out with the aid of the device according to the invention in a suitable embodiment.

[0126] Measurement process:

[0127] Step 1: Sleeve 3 with or without printing plate 5 is pushed onto air-loaded support cylinder 1 of measuring station 2 by air cushion and locked.

[0128] Step 2: The sleeve 3 is identified by means of a unique character string 38. This can be achieved by a barcode, a two-dimensional code (QR code or data matrix code), an RFID code, or NFC.

[0129] Step 3: Positioning the camera 21 and optionally the reference object 30 according to the diameter of the sleeve 3 (with or without the printing plate 5).

[0130] Step 4: The topography 13 of the printing plate (i.e. the radius of the elevations / printing dots 53 to 55) is determined with the aid of a reference point relative to the axis 6 (or the axis center point) of the support cylinder 22. The light source 19 and the camera 21 of the measuring device 18 can be moved axially if necessary, and the support cylinder 22 is rotated (the angular position of which is known via an encoder).

[0131] Step 5: Perform an area scan to identify dot density, free printing areas, printing surfaces, registration marks and / or measurement errors for inline ink measurement.

[0132] Step 6: Using a topography algorithm running on the computer 39, the surfaces are analyzed by surface scanning in such a way that channel impact patterns are identified and registration mark areas or in-line ink measurements are constructed.

[0133] Step 7: Optionally determine the hardness of the printing plate (in Shore A).

[0134] Step 8: Apply a dust detector and / or hair detector.

[0135] Step 9: Store the data of the measurement results in the digital memory 40.

[0136] Step 10: Displaying the measurement results, including a prompt for dust / hair (or trapped air bubbles) and / or a display of boundary values, such as roundness, eccentricity and / or convexity.

[0137] Step 11: It is possible to repeat the measurement or remove the printed sleeve to measure another sleeve.

[0138] Installation process:

[0139] Step 1: The sleeve 3 with the printing plate 5 is pushed onto the air-impacted impression cylinder 16 of the printing press 8 by means of an air cushion and locked.

[0140] Step 2: The sleeve 3 is identified by a corresponding printing unit 9 or a sensor located there with a unique character string 38. This can be achieved by a barcode, a two-dimensional code (QR code or data matrix code), an RFID code, or NFC.

[0141] Step 3: The printing mechanism (or printing press) retrieves the stored data relating to the associated identified printing sleeve / printing forme.

[0142] Adjustment process:

[0143] Step 1: For example, based on the topography, roundness and substrate data for the optimized printing point, a so-called "kiss printing" feed (adjustment of the pressure or working pressure) is performed for the impression cylinder 16 and the anilox cylinder 15. The diameter or radius is determined. The diameter or radius is known from measurement.

[0144] Step 2: Calculate the pre-registration based on the registration mark data on the plate or sleeve reference point.

[0145] Step 3: According to the determined dot density value and the printing surface and speed and the optional printing material, the dynamic pressure feed is adjusted. The hardness of the printing plate (in Shore hardness) can optionally be taken into account.

[0146] Step 4: Setting an optimized material web speed, for example, as a function of the determined resonance frequency of the printing unit for the printing plate calculated by channel impact pattern recognition.

[0147] Step 5: According to the dot density value and the printing surface and the anilox cylinder data (absorption volume, etc.), the optimized drying power (UV or hot air) is adjusted, and optionally dynamically adapted to the product web speed.

[0148] Step 6: Calculate the ink consumption based on the dot density value and the printing surface and anilox roller data (pickup volume, etc.).

[0149] Step 7: Reduce or switch off the LED UV dryer section at locations where there is a small dot density on the printing plate or where no drying is required, in order to save energy and increase the service life of the LED lamp in this way.

[0150] Step 8: Based on the acquired register mark data, for example the mark configuration, the register controller is fully automatically adjusted and the register sensor is automatically axially positioned.

[0151] Step 9: Setting the measurement position for the spectral online measurement and the print inspection of the printed ink, information about the location or measurement position.

[0152] Reference numerals list

[0153] 1 Loading roller

[0154] 2 measuring stations

[0155] 3 sleeves

[0156] 4. Tape

[0157] 5 Printing Plate

[0158] 6 Rotating body, especially printing plate

[0159] 7 First Motor

[0160] 8 Printing presses, especially flexographic printing presses

[0161] 9Printing Agency

[0162] 10. Dryer

[0163] 11 Printing materials

[0164] 12 Measuring ring

[0165] 13. Protrusion / morphology

[0166] 14 Surface

[0167] 15Anilox roller / Anilox drum

[0168] 16Impression roller

[0169] 17 pairs of pressure rollers / printing material conveying rollers

[0170] 18. Measuring device

[0171] 19 Radiation sources, especially light sources

[0172] 20 reflectors

[0173] 21 Radiation receiver, in particular light receiver, such as a camera

[0174] 22 Rotation axis

[0175] 23 Light curtain / light emitted

[0176] 24 Shelter

[0177] 25 Reflected Light

[0178] 26 Working width

[0179] 27 Axial direction

[0180] 28 Movement direction

[0181] 29 Second Motor

[0182] 30 reference objects / linear objects, especially wires / chords / knives / beams

[0183] 31 Reference Lines

[0184] 32 Pitch

[0185] 33 Circumference

[0186] 34 units

[0187] 35 Circumferential direction

[0188] 36 Shelter

[0189] 37 Sensors

[0190] 38 Identification features

[0191] 39 Digital Computer

[0192] 40 Digital Memory

[0193] 41 driving side (AS)

[0194] 42 Operating side (BS)

[0195] 43 Device for detecting point density

[0196] 44 Laser Micrometer

[0197] 45 Third Motor

[0198] 46 measurement lines

[0199] 47 Measuring strips

[0200] 48+ measurement rows

[0201] 50 printing area

[0202] 51 Non-printing area

[0203] 52 Envelope radius / envelope line

[0204] 53 Printing point of printing plate

[0205] 54 The point where the plate is still printed

[0206] 55 Non-printing points of the printing plate

[0207] 56 The Deepest Point

[0208] 57 Radial spacing

[0209] 29b Another second motor

[0210] 39b Another digital computer

[0211] R Radial spacing

[0212] D diameter

Claims

1. A device for measuring the surface of a rotating body or its elevations, the rotating body being designed as a cylinder, a roller, a sleeve or a plate for a graphics industry machine, the device having a first motor for rotating the rotating body about an axis of rotation and having a measuring device, It is characterized in that The measuring device comprises at least one radiation source, at least one area camera, at least one line or line-shaped reference object and at least one computer, for contactless measurement of the surface and for contactless measurement of the reference object, wherein the surface has permanent viscosity and / or compressibility and / or porosity and makes the measurement difficult, and wherein the measuring device determines the circular runout accuracy of the rotating body based on the measurement results for calibration using a virtual reference object, wherein the virtual reference object is a reference line generated by optically measuring the position of the reference object and stored in the computer.

2. The device according to claim 1, It is characterized in that There is a second motor which makes it possible to adjust parts of the measuring device perpendicularly to the axis of rotation.

3. The device according to claim 2, It is characterized in that The second motor adjusts the reference object perpendicular to the rotation axis.

4. The device according to claim 2, It is characterized in that A further second motor adjusts the reference object perpendicularly to the axis of rotation.

5. The device according to claim 1, It is characterized in that The radiation source irradiates at least one area of ​​the surface.

6. The device according to claim 5, It is characterized in that The radiation source is a light source.

7. The device according to claim 1, It is characterized in that The reference object does not move parallel to the axis of rotation.

8. The device according to claim 1, It is characterized in that The reference object is a linear object which is stretched parallel to the rotation axis; or the reference object is an object with an edge, or a beam.

9. The device according to claim 8, It is characterized in that The reference object is a tensioned string, or a tensioned metal wire, or a tensioned carbon fiber.

10. The device according to claim 4, It is characterized in that A third motor is present, which moves the radiation source and the area camera parallel to the axis of rotation.

11. The device according to claim 1, It is characterized in that The measuring device comprises at least one reflector.

12. The device according to claim 1, It is characterized in that The area camera records at least one common image, a common sequence of images or a common film of an axial region of the contour of the rotating body or of the reference object or of the same axial region of the reference object contour.

13. The device according to claim 12, It is characterized in that The computer evaluates the images, image sequences or films and determines in the process the radial distances of individual elevations of the surface from the axis of rotation.

14. The device according to claim 13, It is characterized in that The radial spacing or a value derived therefrom is stored as data in a digital memory.

15. A system comprising the device according to any one of claims 1 to 14 and a flexographic printing press, the flexographic printing press having a further computer and at least one printing mechanism, the printing mechanism comprising a counter-pressing cylinder, at least one flexographic impression cylinder, at least one anilox roller and at least one drive for adjusting the contact force between the counter-pressing cylinder and the flexographic impression cylinder and / or between the flexographic impression cylinder and the anilox roller, It is characterized in that The data are transmitted to a computer of the flexographic printing press and used when setting the contact force.

Images