EP4063121A1 - Procédé et machine de vérification d'un rouleau tramé d'un dispositif d'impression - Google Patents

Procédé et machine de vérification d'un rouleau tramé d'un dispositif d'impression Download PDF

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Publication number
EP4063121A1
EP4063121A1 EP22163674.9A EP22163674A EP4063121A1 EP 4063121 A1 EP4063121 A1 EP 4063121A1 EP 22163674 A EP22163674 A EP 22163674A EP 4063121 A1 EP4063121 A1 EP 4063121A1
Authority
EP
European Patent Office
Prior art keywords
anilox roller
volume
machine
recorded
anilox
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP22163674.9A
Other languages
German (de)
English (en)
Inventor
Pietrangelo Maggi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ulmex Industrie System & Co Kg GmbH
Original Assignee
Ulmex Industrie System & Co Kg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ulmex Industrie System & Co Kg GmbH filed Critical Ulmex Industrie System & Co Kg GmbH
Publication of EP4063121A1 publication Critical patent/EP4063121A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
    • B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/001—Devices for cleaning parts removed from the printing machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/04—Cleaning arrangements or devices for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/12—Cleaning characterised by the methods or devices using laser energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/27—Suction devices

Definitions

  • the invention relates to a method for checking and, if necessary, cleaning an anilox roller of a printing device with a machine, in particular with a laser machine for cleaning anilox and chrome rollers of a flexographic and gravure printing device.
  • the machine is preferably set up to carry out the method.
  • a machine for cleaning anilox rollers with a laser is, for example, from EP 3 418 056 A1 known. A check of the lines as well as the volume and the depth of individual cells does not take place.
  • the anilox roller can therefore be checked to determine whether the quality of the ruling of the anilox roller is still of sufficient quality for printing. If this is not the case, the anilox roller can be processed and thus recoated.
  • the “detected volume” can preferably also be understood as a—weighted or unweighted—mean value from several determined volumes of the anilox roller, which are preferably measured or were measured at at least three different points along the longitudinal axis of the anilox roller. The averaging of several volumes provides a simpler way of assessing whether the anilox roller still has the desired quality or whether subsequent laser cleaning would still make sense or not.
  • roll-related identification features enables the inserted anilox roll to be clearly identified, whereby its dimensions or the individual processing steps during laser cleaning can be monitored or specified.
  • identification feature also makes it much easier to monitor and record recurring cleaning processes of one and the same anilox roller.
  • An “identification feature” is to be understood as a unique identification number or a unique serial number of the specific anilox roller, which is stored or will be stored in the database of the machine's memory. There is also the possibility that the database is stored in a memory of a server remote from the machine.
  • the operating parameters for laser cleaning of the identified anilox roller can also be retrieved from a database and loaded into the processor of the control device on the basis of the roller-related identification feature.
  • the "operating parameters" are to be understood as meaning those settings of the laser cleaning machine on which the laser cleaning is based. These relate, for example, to the feed rate for adjusting the carriage with the laser attached thereto, the rotational speed of the roller rotation caused by the rotation device, the number of cleaning cycles to be carried out or the frequency of the laser pulses of the laser device.
  • the case can arise that either there is no identification feature at all on the anilox roller to be cleaned, or that no operating parameters are stored in the database for the identification feature present on the anilox roller.
  • the dimensions of the inserted anilox roller are then preferably recorded, with the operating parameters for the laser cleaning then being retrieved from a database in the memory based on the recorded dimensions of the anilox roller and are specified for the cleaning, and the laser cleaning is then carried out.
  • the volume of ink to be absorbed (in cubic centimeters per square meter [cm 3 /m 2 ]) of the ruling of the anilox roller, the length of the anilox roller to be tested and the diameter of the anilox roller to be tested are recorded in particular.
  • the surface of the anilox roller In order to ensure even more thorough cleaning of the anilox rollers on the one hand and to prevent unnecessary cleaning of the anilox roller on the other hand, it has therefore proven to be useful for the surface of the anilox roller to be optically recorded by the recording unit, with the recorded image preferably being shown on a display of a Display and operating device is displayed, and wherein the control device uses the captured image to evaluate whether cleaning of the anilox roller should be carried out with the machine, or whether the anilox roller can be removed from the storage device uncleaned. After the uncleaned removal of the anilox roller, it can be sent for reprocessing.
  • the anilox roller also shows other damage that is not necessarily visible on the surface of the sleeve.
  • the concentricity of the anilox roller is checked by the rotary drive rotating the anilox roller about its longitudinal axis, by optically detecting the rotating anilox roller, and by the control device determining the concentricity using the captured images by examining the offset on which the images are based the longitudinal axis of the inserted anilox roller.
  • the detection device is preferably designed as an RFID reader or alternatively as a barcode reader, with the roll-related identification feature being stored in an RFID tag glued to the roll or embedded in the material, or with the roll-related identification feature in the form of a barcodes on the anilox roller.
  • the serial number or identification number can be visible on the anilox roller, in which case there is the possibility that the detection device is a camera attached to the carriage and carried along by the carriage.
  • the serial or identification number is optically captured by the camera, the Control device evaluates the optically captured image and extracts the roller-related identification feature from it in order to retrieve the associated data and the operating parameters for cleaning this anilox roller from the database.
  • the machine according to the invention for testing anilox rollers of a printing device comprises a control device. Furthermore, there is a bearing device for accommodating an anilox roller, which includes a rotary drive which is set up to rotate the anilox roller about its longitudinal axis.
  • an optical detection unit is present and set up to optically detect a lineage comprising cells on the jacket of an inserted anilox roller, the control device being set up to determine the volume of ink to be recorded by the cells using the optically detected images, and a) the anilox roller as reusable to classify an anilox roller if the recorded and determined volume has not reached or fallen below a limit volume, or b) to classify the anilox roller as an anilox roller to be discarded or processed if the recorded and determined volume has fallen below the limit volume.
  • the machine is also designed as a laser cleaning machine for laser cleaning the anilox roller, with a carriage that can be moved along at least one rail and is motor-adjustable parallel to the longitudinal axis of the anilox roller.
  • a laser device is assigned to the carriage and is set up to focus a laser beam on a casing of an anilox roller held by the bearing device.
  • a camera is attached to the carriage and carried along by the carriage, which is set up to optically detect the point of impact of the laser beam on the surface of the anilox roller. In this way, it can be checked - almost in real time - whether the cleaning is carried out with the desired level of purity.
  • optical detection unit for detecting the ruling of the anilox roller also on such or attached to and carried by the same movable carriage.
  • the optical detection unit can be in the form of a high-resolution camera or a microscope. The possibility of laser cleaning or the use of a laser device is therefore not absolutely necessary.
  • the images can also be output to the display in real time.
  • a clocked, i.e. recurring, acquisition of individual images and their subsequent output on the display and operating device is also possible possible.
  • the display and operating device is preferably set up to display the operating parameters for the laser cleaning of an anilox roller that has been inserted, with the display and operating device in particular Includes input means that are adapted to change the set operating parameters. Switches or pushbuttons can be considered as input means.
  • the use of a touch-sensitive screen (“touch screen”) is also possible.
  • a suction nozzle of a suction device attached to the carriage and carried along by it is available and set up to suck up particles, dust, smoke or dirt that was detached from the jacket of the anilox roller in particular by the laser beam .
  • the running rail of the carriage extends below the storage device in the direction of fall.
  • the carriage with the laser device and with the suction nozzle is positioned under the normal operating conditions in relation to the gravitational force below the bearing device and thus below the anilox roller that is held by the bearing device and is to be cleaned. Since the laser and the suction device are below the anilox roller to be cleaned, cleaning is simplified and more thorough, because the loosened dirt automatically sinks in the direction of the suction device.
  • the camera is in the form of a microscope, since it is then also possible to check the indentations of the anilox roller for any residues.
  • the camera can be coupled to the machine control via an interface.
  • An independent microscope can also be used instead of or in addition to the camera be present, so that the control of the machine also has an interface to which a microscope can be connected or to which a microscope is connected.
  • the dimensions of the anilox roller can be recorded and transferred to the machine control in the form of a data stream.
  • the absorbable volume of ink, the diameter and the length of the anilox roller to be cleaned can be detected with the optical detection device formed in this way.
  • a distance sensor is mounted on the carriage and carried along by the carriage, which is set up to detect the distance to the casing of an anilox roller positioned in the bearing device.
  • the distance from the anilox roller determined by the distance sensor can be used to determine whether the focus, i.e. the focal point, of the laser device is on the surface of the anilox roller to be cleaned.
  • the focus of the optical detection unit can also be shifted accordingly until a sharp image of the lines can be detected.
  • the lines of the anilox roller can thus be detected with the optical detection unit, the depth of the wells/cells and the dimensions, in particular the volume, also being able to be determined during the detection.
  • the laser device as such must be adjusted closer to or further away from the anilox roll, or the focus point is shifted by the laser device itself. In both cases, it must be ensured that that the focus of the laser is on the surface of the anilox roller to be cleaned.
  • the focus can be shifted by the laser device by adjusting suitable optics. If it is not possible to shift the focus of the laser device, a motorized adjustment of a part of the carriage or even of the entire travel rail radially with respect to the anilox roller to be cleaned is also possible as an alternative or in addition.
  • the carriage is in particular formed in several parts from a carriage part fastened to the rail and a carriage part which can be adjusted perpendicularly with respect to the longitudinal axis of the rail by means of the servomotor, the adjustable carriage part carrying the laser device.
  • the adjustable carriage part preferably also carries the suction nozzle of the suction device.
  • the adjustable carriage part preferably also carries the distance sensor.
  • the laser device comprises a fiber laser, which comprises a decoupler arranged on the carriage and carried along by the carriage.
  • the use of a fiber laser has proven to be advantageous in the present application, since the longitudinal extent of the pressure rollers is present in any case and thus there is a sufficiently long resonator for a fiber laser.
  • the fiber laser is driven in particular by pump laser diodes, with an active fiber with an erbium-doped core preferably being considered. It is also possible to use a fiber laser whose active fiber is doped with ytterbium or neodymium.
  • the resonator structure of the fiber laser used is preferably realized using fiber Bragg gratings.
  • a pulsed fiber laser is preferably present, in particular a picosecond laser or a femtosecond laser. The use of the pulsed fiber laser ensures that there is less heat input into the anilox roller to be cleaned during cleaning.
  • a laser collimator is attached to the carriage and carried along by the carriage, which is located in the beam path of the light decoupled from the laser device.
  • the laser light emerging divergently from the outcoupler can be bundled again into a parallel bundle of rays in order to direct the laser light in a specific direction, namely in the direction of the anilox roller to be cleaned.
  • the laser collimator is assigned a protective plate that is transparent to laser light.
  • the protective plate has an orientation inclined with respect to the direction of fall, such that particles, dust, smoke or dirt hitting it are deflected to the suction nozzle of the suction device.
  • an electrically operated compressor is advantageously present in the machine. This creates an air flow that is continuously directed onto the protective plate via a hose. This prevents dirt particles from remaining on the glass of the protective plate and thus causing the lens to become cloudy. The latter could lead to the laser beam not being able to penetrate through the protective plate in the desired way.
  • the protective plate itself can, for example, also be cleaned with suitable cloths or paper for lens cleaning, in which case paper soaked in high-purity acetone can be used in particular.
  • the protective plate is covered with an exchangeable protective film that is permeable to laser light on its side facing the bearing device and thus the anilox roller.
  • the protective film can therefore be detached from the protective plate and replaced with a new protective film. A high degree of transmission for laser light and, as a result, a low degree of contamination are required in order to achieve the desired cleaning result for the anilox roller.
  • the suction device comprises a fan spatially separated from the carriage for generating a negative pressure and a flexible suction line fluidically connecting the suction nozzle on the carriage to the fan.
  • Any existing machine housing can have several air intake openings, which are preferably covered with a filter.
  • the storage device can be adjusted to the length of an anilox roller to be cleaned, including in particular the Storage device comprises a stationary storage unit with at least two bearing rollers for supporting a first end of the anilox roller and a displaceable bearing unit with at least two bearing rollers for supporting the second end of the anilox roller.
  • the machine can therefore also clean anilox rollers of different lengths.
  • a simple adaptability of the bearing device to the dimensions of the anilox roller to be cleaned can be brought about, for example, by having two rails extending parallel to the longitudinal axis of the anilox roller and by the displaceable bearing unit being carried by the two rails.
  • the rails can be fixed, for example, to a machine frame or to the machine housing.
  • the position of the movable storage unit should be temporarily fixed, and therefore also fixed.
  • the displaceable storage unit comprises part of a quick-release fastener which is set up to interact with a part of the quick-release fastener which is present on at least one of the rails and is complementary thereto, as a result of which the position of the displaceable storage unit with respect to the stationary storage unit can be releasably fixed is.
  • the rail can be formed, for example, with a plurality of recesses or openings, in which a clamping piece of a toggle clamp, in particular a horizontal clamp, engages in a fitting manner. In this way, the distance between the stationary storage unit and the displaceable storage unit is temporarily fixed.
  • the rotary drive is assigned to the stationary bearing unit.
  • at least one of the bearing rollers of the stationary bearing unit can be driven in rotation by the rotary drive.
  • the stationary bearing unit is assigned a first rotary encoder for detecting a rotational movement of at least one of its bearing rollers, and when the displaceable bearing unit is assigned a second rotary encoder for detecting a rotational movement of at least one of its bearing rollers.
  • the first encoder of the stationary storage unit can be integrated into the rotary drive itself, for example. By using two different rotary encoders, the recorded signals can be validated, with the detection of a difference between the two rotary movements being detected indicating the presence of slip.
  • a more reliable rotation of the pressure roller to be cleaned can be brought about by using more than one bearing roller to drive the pressure roller to be cleaned in rotation.
  • the bearing rollers of the stationary bearing unit can be driven in synchronism via a revolving traction mechanism.
  • a belt or a chain for example, can be used here as a means of traction.
  • the use of a toothed belt is also possible.
  • the stationary bearing unit and/or the displaceable bearing unit includes a mechanical stop for an end face of an anilox roller to be cleaned.
  • the machine uses a laser device for cleaning the anilox roller, it has proven to be advantageous if there is a machine housing that encloses a processing area that is accessible via a machine cover that can be adjusted between an open position and a closed position.
  • a progress display device is installed in the machine housing on its side facing away from the processing area Display of a cleaning progress is integrated.
  • This progress indicator device preferably extends parallel to the travel rail of the carriage or parallel to the longitudinal axis of the anilox roller to be cleaned.
  • the progress display device is preferably in the form of an LED strip that includes a number of light-emitting diodes (LEDs) that include individually controllable LEDs.
  • a sensor assigned to the carriage preferably detects its position and then causes those LEDs of the bar to light up that are "at the level" of the carriage.
  • the cleaning progress can also be visualized on the display and operating device, which preferably has a corresponding display for this purpose.
  • the control device is preferably set up, depending on the degree of deviation of the measured data from the nominal data of the anilox roller, to carry out processing corresponding to the degree or degree to specify appropriate laser settings for a laser cleaning; and preferably also to be carried out automatically.
  • the machine can preferably carry out the cleaning completely automatically, since it compares the measured data with the nominal data and can thus independently choose between different modes.
  • the machine can, for example, use the "soft" (weak), "normal” and “strong” (strong) modes for cleaning.
  • FIG 1 a machine 100 for cleaning anilox rollers 200 of a printing device by means of a laser is shown.
  • This machine 100 includes a machine housing 136 which encloses a machining area 154 .
  • the processing area 154 is accessible via a machine cover 156 that can be adjusted between an open position and a closed position.
  • the machine cover 156 has a handle in order to raise or lower the machine cover 156, which in the present case is attached to a hinge.
  • a display and operating device 152 is also attached to the machine housing 136 or the associated machine frame 162, which is in communication with the machine controller in order to be able to transfer input or control commands to the machine controller or to display information from sensors of the machine 100 of the display and operating device 125.
  • a progress display device 150 for displaying cleaning progress can also be seen, which is formed in particular from a chain of light-emitting diodes.
  • the number of glowing - or the light-emitting diodes glowing in a different color proportional to the progress of the cleaning of an anilox roller 200 (anilox) cleaned in the processing area 154.
  • the progress display device 150 can also be used to indicate an error to the machine operator, for example by the light-emitting diodes flashing or by the light-emitting diodes lighting up in a different color; for example in the color "red" to indicate an error.
  • the cleaning progress and/or the display of any errors can also be displayed on the display and operating device 152.
  • FIG 2 1 is a top plan view of machine 100 with machine cover 156 removed.
  • the machine 100 has a storage device 102 for receiving an anilox roller 200 .
  • the bearing device 102 can be adapted to the length of an anilox roller 200 to be cleaned.
  • the storage device 102 comprises a stationary storage unit 128 with at least two bearing rollers 130 for supporting a first end of the anilox roller 200 and a displaceable bearing unit 143 with at least two bearing rollers 130 for supporting the second end of the anilox roller 200.
  • the bearing rollers 130 are assigned additional auxiliary bearing rollers 132 , in order to be able to reliably accommodate the anilox roller 200 to be cleaned in the storage device 102.
  • a rail 106 and a carriage 108 that can be moved along the rail 106 and is motor-adjustable parallel to the longitudinal axis of the anilox roller 200 .
  • a laser device 110 is assigned to the carriage 108 and is set up to focus a laser beam on a casing of an anilox roller 200 held by the bearing device 102 .
  • a suction nozzle 112 of a suction device 114 is also attached to the carriage 108 and carried along by it, which is set up to suck off particles, dust, smoke or dirt that was detached from the jacket of the anilox roller 200 in particular by means of the laser beam.
  • the machine 100 in particular its processing area 154, is shown, with an anilox roller 200 being accommodated by the storage device 102.
  • the rail 106 of the carriage 108 extends below the storage device 102 in the direction of fall. The consequence of this is that falling particles or falling dust can be sucked off more easily by the suction device 114 by means of its suction nozzle 112 .
  • the suction device 114 comprises a blower 126 which is spatially separated from the carriage 108 and which has only been drawn in dashed lines in the figures for illustrative purposes. This blower 126 is set up to generate a negative pressure.
  • the suction device 114 also includes a flexible suction line 160 that fluidically connects the suction nozzle 112 on the carriage 108 to the blower 126.
  • this suction line 160 is only partially shown in FIG figure 3 shown.
  • the machine housing 136 comprises a plurality of air passages which are covered by filters 158, which can be replaced in particular. Air passages that are fluidically connected to the fan 126 can also be provided with such filters 158 .
  • a distance sensor 118 is attached to the carriage 108 and carried along by the carriage 108, with the distance sensor 118 being set up to detect the distance to the casing of an anilox roller 200 positioned in the bearing device 102.
  • the focus of the laser device 110 can be suitably adjusted depending on the detected distance from the surface of the anilox roller 200 . This can be done, for example, by using suitable optics in the beam path of the laser. However, it can also be provided that the optics of the laser device 110 cannot be adjusted.
  • the focus of the laser beam can therefore be displaced radially with respect to the longitudinal axis of anilox roller 200 to be cleaned by means of a servomotor 164 on carriage 108 such that the focus of the laser beam of laser device 110 is positioned on the lateral surface of anilox roller 200 to be cleaned.
  • the carriage 108 is formed in several parts from a carriage part fastened to the travel rail 106 and a carriage part that can be adjusted perpendicularly with respect to the longitudinal axis of the travel rail 106 by means of the servomotor 164 , the adjustable carriage part carrying the laser device 110 .
  • the adjustable carriage part also carries the suction nozzle 112 of the suction device 114.
  • the adjustable carriage part preferably also carries the distance sensor 118 to detect a change to detect the distance from the jacket of the anilox roller 200 to be cleaned during the adjustment movement.
  • the laser device 110 preferably comprises a fiber laser, which comprises a decoupler arranged on the carriage 108 and carried along by the carriage 108 .
  • This fiber laser is preferably driven by a plurality of pump laser diodes, with an erbium-doped glass fiber core being used as the active fiber of the fiber laser. Doping with ytterbium or neodymium is also possible.
  • One or more fiber Bragg gratings are preferably present in the active fiber. In order to bring about a low heat input into the material of anilox roller 200, pulsed operation of laser device 110 takes place.
  • a camera 116 is fixed to the carriage 108, in particular to an angle piece extending from the carriage main body, which is directed with its optics to the casing of the anilox roller 200 to be cleaned.
  • a camera 116 is attached to the carriage 108 and carried along by the carriage 108, which is set up to optically detect the point of impact of the laser beam on the surface of the anilox roller 200.
  • the camera 116 is also fastened to the adjustable carriage part.
  • the camera 116 is preferably in the form of a microscope.
  • the camera 116 can capture images of the surface of the anilox roller 200 to be cleaned continuously or in a clocked manner. These images can then be displayed on the display and operating device 152, for example.
  • the camera 116 forms an optical detection unit—high resolution with at least 2K or with at least 4K or with at least 8K—which is set up to optically detect a linework on the casing of an inserted anilox roller 200 that includes cells.
  • the optical detection device can also be present as a separate component of the machine 100 .
  • the control device is set up to determine the volume of ink to be picked up by the cells based on the optically recorded images of the optical recording device, and a) to classify the anilox roller 200 as an anilox roller 200 that can be reused if the recorded and determined volume has not reached or fallen below a limit volume, or b) the anilox roller 200 as to be discarded or classify anilox roller 200 to be processed if the detected and determined volume has fallen below the limit volume.
  • the laser light coupled out by the coupler of the laser device 110 is initially diffuse, so that in the present case a laser collimator 120 is attached to the carriage 108 and carried along by it, which is located in the beam path of the light coupled out of the laser device 110 .
  • a laser collimator 120 is assigned a protective plate 122 which is transparent to laser light.
  • the position of the protective plate 122 can be fixed by a holder on the carriage 108, in particular on the carriage body. In figure 5 this holder can be seen with the protective plate 122 inserted in it.
  • the protective plate 122 In its installation position, the protective plate 122 has an orientation inclined with respect to the direction of fall, such that particles, dust, smoke or dirt that strike it are deflected to the adjacent suction nozzle 112 of the suction device 114 .
  • the protective plate 122 can be cleaned with suitable cloths or papers.
  • FIG 6 A top view of the storage device 102 can be seen, with the stationary storage unit 128 being shown on the left and the displaceable storage unit 134 on the right. It can be seen that both bearing units 128, 134 include bearing rollers 130 which are rotatable about bearing axes. Auxiliary bearing rollers 132 are also assigned to the bearing units 128, 134, which ensure that the anilox roller 200 to be cleaned is accommodated in a more reliable manner.
  • the rotary drive 104 is assigned to the stationary bearing unit 128, with the rotary drive 104 being able to drive at least one of the bearing rollers 130 in rotation.
  • the bearing rollers 130 of the stationary bearing unit 128 are connected to one another in a rotationally fixed manner via a revolving traction mechanism 146, so that both bearing rollers 130 rotate when the rotary drive 104 is in operation.
  • a revolving traction mechanism 146 which can be formed for example as a belt, toothed belt or chain, run around the two bearing rollers 130 of the stationary bearing unit 128 in synchronism.
  • the bearing rollers 130 of the displaceable bearing unit 134 can be unpowered, so that they rotate only due to the rotational movement of the anilox roller 200 to be cleaned.
  • the two bearing units 128, 134 are equipped with a stop 148 against which the end face of an anilox roller 200 to be cleaned can be placed.
  • the distance between the two bearing units 128, 134 can be adjusted, with the displaceable bearing unit 134 being assigned part of a quick-release fastener 140 for this purpose.
  • a quick-action clamp in the form of a toggle-lever quick-action clamp, which is formed in particular as a flat clamp and whose free clamping piece can engage in recesses on rails 138 on the machine frame 162 or on the machine housing 136 to fit.
  • the displaceable storage unit 134 thus has a part of the quick-release fastener 140 that is set up to interact with a complementary part of the quick-release fastener 140 that is present on at least one of the rails 138, whereby the position of the displaceable storage unit relative to the stationary storage unit 128 can be detached is fixable.
  • the rails 138 are shown in plan view, for example figure 2 to recognize.
  • the displaceable storage unit 134 is slidable or displaceable along these two rails 138 and is also supported by the rails 138 .
  • the two rails 138 also extend parallel with respect to the longitudinal axis of an anilox roller 200 to be cleaned.
  • the stationary bearing unit 128, in particular its rotary drive 104 is assigned a first rotary encoder 142 for detecting a rotary movement of at least one of its bearing rollers 130.
  • the displaceable bearing unit 134 also has a second rotary encoder 144 for detecting a rotational movement of at least one of its is assigned to both bearing rollers 130.
  • the signals from the two rotary encoders 142, 144 can be used to check whether there is slippage between the anilox roller 200 to be cleaned and the rotary drive 104, specifically when the first rotary encoder 142 detects a rotation that is detected by the signal from the second rotary encoder 144 cannot be validated because the latter does not detect any rotational movement. If slippage is avoided, this contributes to a good cleaning result. However, if the occurrence of slippage is detected due to the differing signals from the rotary encoders 142, 144, an error can be output on the progress display device 150 of the machine housing 136 or on the display and operating device 152.
  • the machine 100 includes a control device that implements the method. First, an anilox roller 200 to be cleaned is placed in the storage device 102 (step S100).
  • a roller-related identification feature present on the inserted anilox roller 200 is then detected by means of a detection device (step S200), the identification feature representing, for example, a unique serial number of the roller.
  • the detection device can be in the form of an RFID reader or a barcode reader, in which case the roller-related identification feature is stored in an RFID tag or is present as a barcode.
  • the detection device can also be formed by the optical camera 116, which then has a dual function: on the one hand, it can optically capture the roller-related identification feature, and on the other hand, it can be used to optically monitor the cleaning process. In any case, the detection device is used to uniquely identify the inserted roller.
  • the detected roller-related identification feature is then evaluated by the control device (step S300), which also checks (step S400) whether the identification feature can be assigned to data in a database in which the operating parameters for laser cleaning are stored.
  • the dimensions of the inserted anilox roller 200 are recorded, with the operating parameters for the laser cleaning based on the recorded dimensions, in particular based on of the anilox roller 200 can be retrieved from a database in the memory and specified for cleaning (step S500).
  • the control device retrieves the roller-related data for the laser cleaning from the database and sets or specifies them for the forthcoming cleaning (step S600).
  • the detected diameter can represent an average value which is formed from at least three measured diameters which are measured at different points along the longitudinal axis of the anilox roller 200 .
  • Steps S500 and S700 use a method for checking anilox roller 200, with the cells of the linework on the jacket of the inserted anilox roller 200 being optically detected by the optical detection unit, with the linework detected being evaluated and the volume of ink to be picked up by the cells being measured by the control device is determined, and wherein a) anilox roller 200 is classified as an anilox roller 200 that can be reused if the recorded and determined volume has not reached or fallen below a limit volume, or b) anilox roller 200 is classified as an anilox roller 200 to be discarded or processed if the recorded and determined volume has fallen below the limit volume.
  • the depth of the wells (cells) is preferably also determined.
  • step S800 Based on the recorded volume, it can be checked whether cleaning makes sense and is expedient, or whether cleaning should be prevented because the recorded volume falls below the limit volume (step S800).
  • a currently recorded volume is compared with a previously recorded volume in at least one previously performed test or laser cleaning, which is stored in the database for the inserted anilox roller 200, with the laser cleaning also being suppressed if the difference from the currently recorded volume and the previously recorded volume reaches or exceeds a threshold value.
  • the anilox roller 200 is released or removed without being cleaned (step S900), which can then be sent for reprocessing, both when the volume falls below the limit and when the threshold value is reached when a difference is formed with the volumes that were recorded during previous checking and/or cleaning processes .
  • the concentricity of the anilox roller 200 is also checked (step S1000) by the rotary drive 104 rotating the anilox roller 200 about its longitudinal axis by optically detecting the rotating anilox roller 200 , and by the control device determining the concentricity on the basis of the recorded images by examining the offset of the longitudinal axis of the inserted anilox roller 200 on which the images are based.
  • the images are preferably supplied by the recording device in the form of the camera 116 attached to the carriage 108 and carried along by the carriage 108 .
  • the cleaning roller 200 can be released or removed without being cleaned (step S900) if the concentricity properties determined for the anilox roller 200 do not have the desired quality for the laser cleaning.
  • the inserted anilox roller 200 is laser cleaned with the set operating parameters, during which the anilox roller 200 rotates about its longitudinal axis and during which the laser is adjusted parallel to the longitudinal axis by the carriage 108 (step S1100).

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP22163674.9A 2021-03-23 2022-03-22 Procédé et machine de vérification d'un rouleau tramé d'un dispositif d'impression Withdrawn EP4063121A1 (fr)

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DE102021107098.8A DE102021107098A1 (de) 2021-03-23 2021-03-23 Verfahren und Maschine zur Prüfung einer Rasterwalze einer Druckvorrichtung

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ES2967802A1 (es) * 2022-10-05 2024-05-03 Sanchez Daniel Vilchez Equipo de limpieza de rodillos anilox

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EP3418056A1 (fr) 2017-06-07 2018-12-26 Teg Technologies Research and Development, S.L. Dispositif de nettoyage au laser d'un rouleau tramé et procédé de réglage automatique du point focal du laser au diamètre du rouleau tramé

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EP3418056A1 (fr) 2017-06-07 2018-12-26 Teg Technologies Research and Development, S.L. Dispositif de nettoyage au laser d'un rouleau tramé et procédé de réglage automatique du point focal du laser au diamètre du rouleau tramé

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