• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The novel anilox roller cleaning machine by laser consists of a multi-laser head (4) with two or more laser modules (5) that generates two or more contiguous focal points (16), whose separation can be modified by moving the laser modules (5) along a guide (6). It also incorporates a feeler wheel (28) associated with an encoder (21) operatively connected to the electronic system of the machine (22) and, in particular, with the emergency stop system (23). Another novel aspect of the invention refers to a method and means for auto-adjusting the laser focal point (16) to the diameter of the anilox roll, in which the displacement of the second movable support (20), which is proportional to the diameter of the roller, is measured. anilox (2), said telemetry being received by the electronic system of the machine (22) that extrapolates the distance to be moved by the multi-laser head (4) so that the focal point (16) is located on the surface of the anilox (2) , maneuvering the servomotors (11) of the micrometric axes (10) to drive the multi-laser head (4) to that position.
    公开号:ES2636715A1
    申请号:ES201730781
    申请日:2017-06-07
    公开日:2017-10-06
    发明作者:Lluis GUIXERAS NOGUÉ；Rafael GUIXERAS LLORÀ
    申请人:Sitexco Girona S L；SITEXCO GIRONA SL；
    IPC主号:
    专利说明:

    Anilox laser roller cleaning machine and procedure for self-adjusting the laser focal point to the diameter of the anilox roller.
    TECHNICAL FIELD
    The present invention relates to the anilox roller of a flexographic printing machine, and more specifically to an operating procedure and improvements in a machine for cleaning the anilox roller by laser technology.
    BACKGROUND OF THE INVENTION
    Flexography is a printing technique that uses a flexible plate with relief called cliché, capable of adapting to a variety of media or very varied printing substrates.
    In this printing system, liquid inks characterized by their rapid drying speed are used. This high drying speed is what allows printing high volumes at low costs, compared to other printing systems.
    Printers are usually rotary and the main difference between these and other printing systems is the way in which the cliché receives the ink. Generally, a rotating roller of rubber or other materials, such as polyurethane or urethane, collects the ink that is transferred by contact to another cylinder called anilox, with the intervention of a scraper that removes excess ink from the roller.
    The anilox is made of chromed steel mechanically engraved or laser engraved ceramic to have a surface with alveoli or microscopic-sized hollows with which it transfers a light layer of regular and uniform ink to the cliché. Subsequently, the cliché will transfer the ink to the media to be printed.
    Over time, the alveoli or hollows of microscopic size are covered with dry ink, which reduces the effectiveness of the roller, in particular the volume of the point, so it is necessary to periodically clean them.
    Commonly, anilox are cleaned by three different techniques, solvent washing, soda blasting and ultrasonic procedures. These have limited effectiveness.
    Many inks are resistant to common solvents. Also, some solvents cannot be used, due to their negative effect on the environment. In ceramic anilox, some solvents penetrate through the pores of the ceramic coating to attack the metal core of the roller whereby the ceramic coating can be separated from the metal core. Ultrasonic and soda cleaning can physically damage the ceramic itself.
    Alternatively to the common anilox cleaning methods, a new method based on LASER scanning of the surface of the anilox has been developed.
    These devices consist of a mechanical structure that supports the anilox and a laser resonator. The mechanical structure rotates the anilox while the laser resonator separates and volatilizes the dried ink and the residues deposited in the alveoli or hollows of microscopic size.
    Various inventions for cleaning and maintaining anilox based on the laser scanning of its surface are currently known.
    US6354213 describes an apparatus for cleaning an anilox roller that involves the use of a laser resonator and comprising a first drive motor that rotates the anilox roller, a laser resonator slidably fixed in a guide projecting a laser beam ; a laser beam expander; a lens that orients the expanded laser beam towards the surface of the anilox roller so that the slag contained in the alveoli is detached without affecting the ceramic or chrome coating; a blowing device directed towards the focal point of the laser beam that expels the detached slag; a second drive motor that moves the laser resonator, the beam expander and the lens in an axial direction parallel to the longitudinal axis of the anilox roller; a bearing integral to the lens, which travels on the surface of the anilox roller, maintaining the appropriate distance so that the focal point of the laser beam affects the surface of the anilox roller.
    Patent DE4472152 describes an apparatus for cleaning anilox rollers comprising a laser resonator that, through an optical system, emits a laser beam towards a mirror that guides it towards the anilox roller. Detached slag is removed through a suction hose.
    Patent DE102011013910 describes an apparatus for cleaning anilox rollers that establishes a different operating scheme. In this case, a laser resonator emits a laser beam that is conducted through optical fibers to several cleaning heads that make a fraction of the original beam strike against an area of the surface of the anilox.
    Patent DE102015110877 describes an anilox roller cleaning apparatus by means of laser radiation, in which the beam of a laser resonator is made to directly affect the surface of the anilox roller, the slag being removed by means of a band impregnated in an adhesive element.
    The cleaning capacity of these devices is much greater than that of conventional methods: solvent washing, soda blasting and ultrasonic procedures, however, the operating time is longer, as it is necessary to make several passes or sweeps depending on the degree of Anilox dirt.
    The scanning speed of the laser beam is limited by the combination between the power of the resonator and the frequency of the emission. At higher power, greater cleaning capacity, but at the same time higher temperature in the cleaning zone, so a limit is established from which damage to the surface of the roller occurs. Also, at a higher frequency, greater cleaning capacity, however, the cost of the resonator equipment increases considerably.
    It would be beneficial and advisable to develop a device for cleaning anilox that, at equal power and resonator frequency, shortens the maneuver time.
    Another problem present in anilox laser cleaning systems is the adaptation of the focal length of the beam to the diameter of the anilox to match the focal point on the surface of the cylinder. This adaptation is done in two ways. The first, manually using micrometric axes that allow radially displacing the focal point of the laser beam with respect to the surface of the anilox roller. This system has the disadvantages of manual mechanical adjustments, derived from wear of the parts, mismatches due to vibrations, etc.
    The second way of adjustment is assisted, for which the device incorporates an electronic system in which the characteristics of the anilox are introduced through a user interface, so that a software program determines the appropriate coordinates of the focal point of the beam and drives a servomotor that moves it radially to the calculated position. This system has the disadvantage of the possibility of error in data entry, which implies placing the focal point at wrong coordinates and consequently the low or zero operability of the laser scan.
    It would be beneficial to incorporate means of automatic adjustment of the focal point without operator intervention.
    Another problem present in anilox laser cleaning systems is the lack of means to determine if the anilox roller is rotating properly in its support bed. There have been cases in which, due to wear of the tractors of the roller, due to jamming of the axis of rotation, due to lack of alignment or irregularities in the surface of the anilox, it can rotate irregularly or even stop, so that overexposure of the surface of the anilox to the laser beam occurs, irreparably damaging itself.
    It would be beneficial to incorporate safety means that stop the laser scanning if the rotation of the anilox roller is irregular or stops accidentally.
    DESCRIPTION OF THE INVENTION
    The present invention relates to a machine for cleaning anilox rollers and a method for self-adjusting the laser focal point to the diameter of the anilox roller which, in the face of the drawbacks described in the previous section, has the following advantages:
    - It reduces the operating times to equal power and frequency of the resonator.
    - It includes safety means capable of stopping the cleaning operation when the rotation of the anilox is not stable or stops accidentally.
    - It involves means of self-adjustment of the laser focal point to the diameter of the anilox, avoiding the possibility of human error in its positioning.
    The new laser anilox roller cleaning machine is constituted from a mechanical structure that fixes all the elements of the machine and where the anilox roller is located in a bed formed by two tractor rollers and free rollers, among which rest
    This mechanical structure has a multi-laser head consisting of two or more laser modules mounted independently on a first movable support common to both, with the possibility of regulating the separation between them. The multi-laser head is associated with a horizontal displacement car with the intermediation of vertically movable cartels.
    Each laser module incorporates a laser resonator that emits a laser beam whose focal point is located in the vertical plane equidistant between the axes of rotation of the tractor rollers. This data is highly relevant since in this way the beam has a perpendicular impact on the bottom of the alveoli without generating dark areas in which the light radiation does not reach with sufficient power limiting its ability to detach and volatilize the slag. Another device incorporated in the laser module is an aspiration element formed by a vertical tube connected to a flexible hose which, at its distal end, is connected to a common aspiration system terminated in a nozzle oriented towards the focal point of the laser beam.
    The multi-laser head generates two or more laser focal points, so that one pass
    or head scanning is equivalent to two or more sweeps of a conventional laser machine, with fewer passes being necessary to achieve the same level of cleanliness. This results in operating times at least 45% lower than equal frequency and resonator power.
    Another novel aspect of the invention refers to the incorporation of means capable of stopping the cleaning operation when the rotation of the anilox is not stable or stops accidentally.
    Specifically, these means consist of a touch wheel constituted one of the free rollers of the bed, or mounted on a second movable support that is arranged between the traction rollers of the bed. The probe wheel is associated with an encoder or other motion detector that is linked to the machine's electronic system and in particular with the emergency stop system.
    The operation is simple and effective: when placing the anilox roller between the traction rollers, it comes into contact with the touch wheel or with the free rollers of the bed. When the tractor rollers rotate the anilox roller, it, in turn, rotates the stylus wheel that can only rotate due to the movement of the anilox. Under these conditions, the probe wheel drives the encoder or motion detector that sends its telemetry to the system operator that determines the existence of movement and its characteristics. If, while the tractor rollers are active, the movement detected in the anilox is not as expected,
    or no movement is detected, the electronic system assumes an irregular situation and makes an emergency stop of the multi-laser head, preventing the laser beams from damaging the surface of the cylinder by overexposure.
    Given the importance of this system, its integration into the machine will preferably be done redundantly.
    Another novel aspect of the invention refers to a method and means of self-adjusting the laser focal point to the diameter of the anilox, capable of accurately detecting the diameter of the anilox roller without the need for operator intervention, and based on the detected measurement, move the multi-laser head to the proper position to match the focal point of the laser beam on the surface of the anilox roller.
    These means are constituted by a detection element that determines the position of the second movable support of the touch wheel, or of a specific support for this function, which is arranged between the traction rollers of the bed and is displaced by the anilox roller When the probe wheel or a specific wheel comes into contact with its surface.
    The new procedure for self-adjustment of the laser focal point to the diameter of the anilox is based on the premise that, in the self-adjusting means incorporated, the displacement of the second movable support is proportional to the diameter of the anilox roller; more pronounced the smaller the diameter of the anilox roller, so that, by measuring said displacement, the diameter of the anilox roller can be deduced, and calculate the distance to be traveled by the multi-laser head until it is placed at the appropriate height on the anilox to perform its function .
    The operation is as follows: when placing the anilox roller between the tractor rollers, it comes into contact with the touch wheel and pushes it, lowering the second movable support along its guides to a stable position.
    Then the detection element measures the section descended by the second movable support and said telemetry is received by the electronic system of the machine which, based on that data and the known variable corresponding to the focal length of the laser beam, extrapolates the distance that The multi-laser head must be moved so that the focal point is located on the surface of the anilox roller, then maneuvering the servomotors of the micrometer shafts to place the multi-laser head in the proper position.
    DESCRIPTION OF THE DRAWINGS
    In order to illustrate how far we have set forth, the description of a sheet of drawings in which an example of embodiment of the invention has been represented is attached.
    In said drawings, Figure 1 represents a general perspective view of the machine in which the set of its components and an anilox roller in cleaning position can be seen in a configuration in which the stylus wheel performs double function as a detector element of rotation of the anilox roller and as a component in the means of self-adjustment of the laser focal point.
    Figure 2 represents a side view of the machine with an anilox roller of the maximum allowable diameter.
    Figure 3 represents a side view of the machine with an anilox roller of the minor
    allowable diameterThe differences in position of the machine components observable between the figure2 and Figure 3, show that the diameter of the anilox roller is proportional to thedisplacement of the probe wheel support.
    Figure 4 represents a schematic view of a laser module and beam geometrylaser generated.
    Figure 5 represents a multi-laser head of two laser modules in its holder.Figures 6 and 7 represent the schematic of a multi-laser head of two laser modules,in which the two laser beams generated are appreciated, where the example of figure 6presents the position of minimum distance between laser focal points, while in theexample of figure 7 the distance between the focal points is maximum.
    Figure 8 represents a detailed view of the probe wheel mounted on the second
    scrollable standFigure 9 corresponds to a scheme of operation of the security meansable to stop the cleaning operation when the rotation of the anilox is not stable oraccidentally stops and from the means of self-adjusting the laser focal point to the diameter of theanilox roller
    Figure 10 represents a general perspective view of the machine in which it is appreciatedthe set of its components and an anilox roller in cleaning position in aconfiguration in which the probe wheel is constituted by one of the free rollers.
    REFERENCE LIST 1-Mechanical structure 2-Anilox roller 3-Tractor rollers 4-Multi-laser head 5-Laser module 6-Horizontal guide
    7-First scrollable stand8-Horizontal scroll car9-Portfolios10-Vertical micrometric axes
    5 11-Servomotors 12-Carriage guides 13-Worm screw 14-Laser resonator 15-Laser beam
    10 16-Focal point 17-Vertical tube 18-Nozzle 19-Flexible hose 20-Second movable support
    15 21-Encoder 22-Electronic system 23-Emergency stop 24-Operating state 25-Detection element
    20 26-Guides
    27-Free rollers DESCRIPTION OF A PREFERRED EMBODIMENT The present invention consisting of improvements introduced in cleaning machines
    of anilox rollers that are constituted from a mechanical structure (1) that fixes all the elements of the machine and where the anilox roller (2) sits on a bed formed by two tractor rollers (3) and other free rollers (27 ).
    This mechanical structure has a multi-laser head (4) consisting of two Laser modules (5) mounted on a horizontal guide (6) of a first movable support (7).
    The multi-laser head (4) is associated with a horizontal displacement carriage (8) with the intermediation of vertically movable cartels (9).
    The horizontal displacement carriage (8) runs parallel to the anilox roller (2) following carriage guides (12) in solidarity with the mechanical structure (1) and driven by a motorized worm screw (13).
    The brackets (9) are coupled to vertical micrometric axes (10) arranged in the horizontal displacement carriage (8) and driven by servo motors (11), so that, depending on whether the micrometric axes are turned left or right, the first movable support (7) with the multi-laser head (4), will rise or descend in a controlled manner.
    The servomotors (11) are operatively connected to the electronic system of the machine (22), from where they are commanded.
    Each laser module (5) incorporates a laser resonator (14) that emits a laser beam (15) whose focal point (16) is located in the vertical plane equidistant between the axes of rotation of the tractor rollers (3). It also incorporates a suction element formed by a vertical tube
    (17) connected to a flexible hose (19), terminated in a nozzle (18) oriented towards the focal point (16). This suction element absorbs the debris detached from the surface of the anilox roller by the action of the laser beam.
    The multi-laser head (4) shown, generates two adjacent focal points (16), whose separation can be modified by moving the laser modules (5) along the guide (6) of the first movable support (7), establishing a position of maximum proximity (fig. 6) and a position of maximum distance (fig. 7). The separation distance between focal points (16) allows controlling the time of entry into action of the second laser scan.
    Another novel aspect of the invention consists in the incorporation of a probing wheel (19), mounted on a second movable support (20) by guides (26) that are arranged between the traction rollers (3) and that drags an encoder (21) operatively connected with the electronic system of the machine (22) and, in particular, with the emergency stop system (23).
    The probe wheel (19) comes into contact with the surface of the anilox roller (2) by rotating with it and at the same time dragging the encoder (21) that generates a telemetry received and analyzed 5 by the electronic system of the machine (22).
    While the system detects the existence of movement, the multi-laser head (4) remains in the operational state (24).
    If the system does not detect movement, or the movement detected is irregular, the emergency stop of the machine is activated (23).
    Another novel aspect of the invention refers to the incorporation of self-adjusting means of the laser focal point (16) to the diameter of the anilox roller (2).
    These self-adjusting means consist of a detection element (25) that measures the displacement of the second movable support (20).
    The detection element is operatively connected to the electronic system of the machine (22) that receives and analyzes the telemetry generated by the first.
    As the section descended by the second movable support (20) is proportional to the diameter of the anilox roller (2) deposited between the traction rollers (3) and the focal length of the laser beam is a known parameter, the machine's electronic system ( 22) extrapolate the distance to be traveled by the multi-laser head (4) so that the focal point (16) is
    20 locate on the surface of the anilox (2), rotating the servomotors (11) of the micrometric shafts (10) to drive the multi-laser head (4) to that position.
    权利要求:
    Claims (1)
    [1]
    1.-Laser anilox roller cleaning machine, of the type that incorporates a mechanical structure where an anilox roller rotates on its longitudinal axis, in a bed formed by two tractor rollers, free rollers and a horizontal displacement car that runs parallel to the anilox roller, characterized essentially because it involves:
    - A multi-laser head (4) with two or more laser modules (5) mounted on a horizontal guide (6) of a first movable support (7) that is associated with the horizontal displacement carriage (8) with the intermediation of some posters (9 ) coupled to vertical micrometric axes (10) integral to the horizontal displacement car (8) and driven by servo motors (11) operatively connected to the electronic system of the machine (22), each laser module (5) being constituted by:
    o A laser resonator (14) that emits a laser beam (15) whose focal point (16) is located in the vertical plane equidistant to the axes of rotation of the tractor rollers (3) of the anilox (2).
    o A vertical tube (17) terminated in a nozzle (18) oriented towards the focal point (16) of the laser beam, connected to a flexible hose (19) which at its distal end is connected to a suction system.
    - A rotation detection means of the anilox roller consisting of a touch wheel (19) in contact with the surface of the anilox roller (2) and integral with an encoder device (21) operatively connected to the electronic system of the machine (22) which, In the absence of motion detection or irregular movement stop, the emergency stop is activated (23).
    2nd Laser anilox roller cleaning machine according to claim one, characterized in that it incorporates self-adjusting means of the laser focal point to the diameter of the anilox constituted by a detection element (25) that measures the displacement of the second movable support (20) to which the probe wheel is associated
    (19) or of a specific support for this function and that is operatively connected to the electronic system of the machine (22) and to the servomotors (11) of the micrometric axes (10).
    (2) It consists of one of the free rollers of the bed.
    3rd laser anilox roller cleaning machine according to claim one, characterized in that the touch wheel (19) in contact with the surface of the anilox roller
    4th Procedure for self-adjustment of the laser focal point to the diameter of the anilox roller applicable to laser anilox roller cleaning machines according to previous claims, characterized in that, being the focal length of the laser beam a known parameter, it consists in measuring the section descended by the second movable support (20) 5 or a specific support for this function, which is proportional to the diameter of the anilox roller (2) deposited between the traction rollers (3), said telemetry being received by the electronic system of the machine (22) that extrapolate the distance to be traveled by the multi-laser head (4) so that the focal point (16) is located on the surface of the anilox (2), maneuvering the servomotors (11) of the micrometric axes (10) to drive the head
    10 multi-laser (4) to that position.
     Fig, 2
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    13 ---- 110 _------ l - 11-12
    8
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    9 __2 3 19
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    17 1'1
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    法律状态:
    2018-02-12| FG2A| Definitive protection|Ref document number: 2636715 Country of ref document: ES Kind code of ref document: B2 Effective date: 20180212 |
    2018-03-13| PC2A| Transfer of patent|Owner name: TEG TECHNOLOGIES RESEARCH AND DEVELOPMENT, S.L. Effective date: 20180313 |
    优先权:
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