EP3741563B1 - Unité d'impression par rotogravure ayant une sécurité de fonctionnement élevée - Google Patents

Unité d'impression par rotogravure ayant une sécurité de fonctionnement élevée Download PDF

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Publication number
EP3741563B1
EP3741563B1 EP20174881.1A EP20174881A EP3741563B1 EP 3741563 B1 EP3741563 B1 EP 3741563B1 EP 20174881 A EP20174881 A EP 20174881A EP 3741563 B1 EP3741563 B1 EP 3741563B1
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EP
European Patent Office
Prior art keywords
sleeve
impression roller
electrical
printing unit
printing
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.)
Active
Application number
EP20174881.1A
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German (de)
English (en)
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EP3741563A1 (fr
Inventor
Daniele BARBUI
Maurizio BARBUI
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.)
ACE Srl
Original Assignee
Ace Di Barbui Davide & Figli Srl
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Publication date
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Publication of EP3741563A1 publication Critical patent/EP3741563A1/fr
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Publication of EP3741563B1 publication Critical patent/EP3741563B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/18—Impression cylinders
    • B41F13/187—Impression cylinders for rotogravure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/02—Arrangements of indicating devices, e.g. counters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/14—Automatic control of tripping devices by feelers, photoelectric devices, pneumatic devices, or other detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/10—Starting-up the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/20—Safety devices preventing damage

Definitions

  • the present invention relates to a printing unit for gravure printing, comprising an impression roller pressed against a printing roller, with the interposition of a sheet or reel material to be printed therebetween. Both the impression roller and the printing roller rotate about the axis thereof, dragging the material therebetween during printing.
  • the impression roller is coated with a coating layer, or sleeve made of an elastomeric material, which is charged electrostatically by an electrostatic printing assistance apparatus.
  • Gravure printing is a direct printing technique for printing a sheet or reel material.
  • Such a technique comprises an impression roller, which is pressed against a printing roller, and these both rotate about respective rotation axes, which are generally parallel to each other.
  • the material to be printed is interposed therebetween and dragged by the rotation of the impression roller and the printing roller.
  • the printing roller has a generally cylindrical outer surface, with a plurality of cavities or cells, corresponding to a figure to be printed onto the material and adapted to receive therein respective amounts of ink to be transferred onto the surface of the material.
  • the ink is generally liquid and contained in an ink tank, in which a portion of the surface of the printing roller is immersed, so that the outer surface of the printing roller can be continuously wet by the ink during the rotation of the same.
  • the excess ink on the outer surface of the printing roller is generally removed by the use of a blade, or a doctor blade, arranged so as to wipe such an outer surface of the printing roller and remove the ink remaining outside the cavities or cells.
  • the side surface of the impression roller is coated by an elastomeric material layer, or sleeve, to favor a uniform pressing of the material to be printed against the printing roller.
  • the technique is known of supplying the printing unit with an electrostatic printing assistance apparatus associated with the impression roller and having the function of distributing an electrostatic charge onto the outer side surface of the elastomeric sleeve of the impression roller.
  • the presence of such a surface charge has the purpose of generating an electric field between the impression roller and the printing roller, through the sheet or reel material, to be printed, which is interposed therebetween.
  • Such an electric field contributes to polarizing the ink contained in the cavities, or cells, of the printing roller, to attract it to the material to be printed, significantly improving the cover of ink in the printed zones and, thus, the resulting printing quality, which is thus more detailed and precise.
  • the elastomeric material of the sleeve sometimes comprises a plurality of conductive particles in order to make such a material semi-conductive or conductive, depending on the type of electrostatic printing assistance apparatus.
  • the intensity of electrostatic charge at play in the gravure printing is of a very high value, thus it represents a critical safety aspect because, if it is not controlled, it could trigger a fire or an explosion.
  • the insulation resistance of the sleeve must always be kept at values close to optimum insulation resistance values, to avoid dangerous excess accumulations of charge on the impression roller and to ensure that the excess electrostatic charge can easily be discharged onto the ground.
  • the insulation resistance value of the sleeve must be controlled also as a function of obtaining a high printing quality, since non-optimum insulation resistance values would have a negative influence on the value of the electric field at the sheet - or reel material to be printed, and therefore the ink would not be polarized optimally for its complete transfer onto the material.
  • the electrostatic charge distributed on the outer side surface of the semi-conductive sleeve by means of the electrostatic printing assistance apparatus would tend to disperse quickly onto the ground, excessively reducing the amount of electrostatic charge, which can be deposited on the sleeve, thus deteriorating the printing quality.
  • the semi-conductive sleeve would charge excessively and take on electrical properties similar to those of a condenser, causing serious risks of forming an electric arc between the impression roller and other conductive parts of the printing machine, or working environment.
  • the need is thus felt to provide a gravure printing unit capable of ensuring high operating safety of the elastomeric sleeve of the impression roller, and simultaneously high printing quality by means of an automatic control of the features of the sleeve before every activation of the electrostatic printing assistance apparatus.
  • US 2017/275115 A1 discloses a winding device for a substantially electrically insulating web material having a winding roller on which the web material can be wound, characterized in that an apparatus exists for transferring an electric charge to the web material on the winding roller, and/or when deflecting to the winding roller, and the apparatus for transferring an electric charge is connected to at least one electrical high-voltage source with a positive or negative polarity.
  • a printing unit for gravure printing a sheet or reel material is globally indicated by reference numeral 1.
  • the material 74 for gravure printing can be, for example, wound onto a reel at the inlet to said printing unit, or at the inlet to a plurality of said printing units arranged in sequence for making successive prints on the same material.
  • the material 74 comprises a film, or layer, made of a polymeric material, for example, is a film made of a polymeric material.
  • the material 74 comprises a layer of paper, and/or a layer of fabric and/or a metal layer, for example, the material 74 is a sheet of paper, or fabric or a metal sheet.
  • the printing unit 1 comprises an impression roller 10, comprising an impression roller body 11 and an impression roller sleeve 30 fitted, or capable of being fitted, onto said impression roller body 11.
  • the impression roller body 11 defines an impression roller rotation axis 12 and an impression roller body side surface 13.
  • the impression roller sleeve 30 has a tubular shape defining an outer sleeve side surface 31 and an inner sleeve side surface 33, said impression roller sleeve 30 comprising an outer layer 32 made of an elastomeric material delimited by said outer sleeve side surface 31.
  • the printing unit 1 comprises a checking apparatus 80 for measuring the electrical insulation resistance of said impression roller sleeve 30 between said inner sleeve side surface 33 and said outer sleeve side surface 31, said checking apparatus 80 being permanently associated with said printing unit 1.
  • the checking apparatus 80 comprises an electrical contact element 81 and a movement device 82 for moving said electrical contact element 81 between a measuring position, in which the electrical contact element 81 is in contact with the outer sleeve side surface 31, and a rest position, in which said electrical contact element 81 is not in contact with, and spaced apart from, the outer sleeve side surface 31.
  • the movement device 82 comprises at least one actuator 83 selected from: a pneumatic actuator, an electro-pneumatic actuator, a hydraulic actuator, an electromagnetic actuator, a mechanical actuator.
  • the aforesaid actuator 83 is of the linear type.
  • the aforesaid actuator 83 could be rotating or rotating-translating.
  • the electrical contact element 81 comprises a rotating contact electrode 84, for example, a wheel, made of a conducting material, adapted to be rotated in contact with the outer side surface 31 of the sleeve by means of rotating the impression roller 10.
  • a rotating contact electrode 84 for example, a wheel, made of a conducting material, adapted to be rotated in contact with the outer side surface 31 of the sleeve by means of rotating the impression roller 10.
  • the measuring device 82 comprises a support element 85 sliding between a first position at said measuring position and a second position at said rest position, said electrical contact element 81, in particular, said rotating contact element 84, or said wheel, being rotatably engaged, preferably free to rotate, at a free end of said support element 85.
  • the printing unit 1 comprises a support upright 60, said impression roller 10 being rotatably engaged to said support upright 60, wherein said checking apparatus 80 of the electrical insulation resistance, is constrained, or fixed, to said support upright 60.
  • the movement device 82 preferably the actuator 83, is constrained, or fixed, to said support upright 60.
  • said checking apparatus 80 of the electrical insulation resistance in particular the movement device 82, in particular the actuator 83, is integrally fixed to the support upright 60, preferably by means of a support bracket 61 fixed to the upright 60.
  • the support bracket 61 is made of a metal sheet, preferably of a folded sheet.
  • the checking apparatus 80 further comprises an electrical circuit 90 connected to said electrical contact element 81 and capable of being connected to said inner sleeve side surface 33, when said sleeve 30 is fitted onto said impression roller body 13, so that when the electrical contact element 81 is in contact with the outer sleeve side surface 31, said electrical circuit 90 is closed through said impression roller sleeve 30 between said inner sleeve side surface 33 and said outer sleeve side surface 31.
  • the electrical circuit 90 is configured to provide a measured electrical insulation resistance value of the sleeve 30 between said inner sleeve side surface 33 and said outer sleeve side surface 31.
  • the electrical circuit 90 comprises an inlet for an electrical voltage source 91 and an electronic control unit 92 adapted to measure the electric current which travels through said electrical circuit 90 and adapted to provide said measured electrical insulation resistance value of the sleeve 30 between said inner sleeve side surface and said outer sleeve side surface 31 as a function of said measured electric current.
  • V R ⁇ I
  • I the current measured along the electrical circuit 90 by means of the electronic control unit 92
  • R the insulation resistance value between the inner sleeve side surface 33 and the outer sleeve side surface 31.
  • the electronic control unit 92 comprises comparison means configured to compare said measured electrical insulation resistance value with a predetermined electrical insulation resistance reference value of the sleeve 30.
  • the printing unit 1 comprises an electrostatic printing assistance apparatus 50 associated with said impression roller 10 and configured to transmit an electrostatic charge to said outer sleeve side surface 31.
  • the electronic control unit 92 comprises activation means configured to provide an inhibition signal for inhibiting the activation of said electrostatic printing assistance apparatus 50 when the measured electrical insulation resistance value of the sleeve 30 differs from the predetermined electrical insulation resistance reference value of the sleeve 30.
  • such activation means are configured to provide an authorization signal to allow the activation of said electrostatic printing assistance apparatus 50 when the measured electrical insulation resistance value of the sleeve 30 is equal, or substantially equal, to the predetermined electrical insulation resistance reference value of the sleeve 30.
  • the electrical circuit 90 is connected to said inner sleeve side surface 33, by means of an electrical connection between said electrical circuit 90 and the impression roller body side surface 13, when said sleeve is fitted onto said impression roller body 11, with said inner sleeve side surface 33 in electrical contact with said impression roller body side surface 13.
  • the electrical circuit 90 is capable of being connected, or connected to said inner sleeve side surface 33 by means of an electrical ground connection 100.
  • This electrical ground connection 95 allows a potential excess electrostatic charge distributed on the outer sleeve side surface 31 to be discharged, or dispersed, onto the ground.
  • the elastomeric material of the outer sleeve layer 32 has a hardness from 50 to 95 Shore A (ShA), preferably from 70 to 95 Shore A (ShA), even more preferably of about 75 Shore A.
  • the elastomeric material comprises a material selected from synthetic rubber and natural rubber.
  • Such an elastomeric material may comprise a plurality of conductive particles dispersed therein, to give such a material a value of conductivity, and thus of a predetermined electrical resistance, based on the type of electrostatic printing assistance apparatus used.
  • the sleeve 30 has an electrical surface resistance value capable of being measured between two different points of said outer side surface 31 of said sleeve, and an insulation resistance value capable of being measured between said outer side surface 31 of said sleeve and the inner side surface 33 of said sleeve.
  • the electrical surface resistance value can be measured, for example, by means of a pad provided with strips of leather soaked in water and arranged around the outer surface of the sleeve, at a distance of 110 mm from one another, to which a voltage of 500 Volts is applied and between which the resulting voltage is measured.
  • the electrostatic printing assistance apparatus 50 comprises a non-contacting, or top loading, electrostatic charge transmitter 51, preferably an electrostatic charge bar 51, configured to transmit an amount of electrostatic charge to the outer side surface 31 of the sleeve 30 from the outside of the impression roller, preferably radially to the impression roller, preventing an electrical contact with said outer side surface 31 of said sleeve 30.
  • electrostatic charge transmitter 51 preferably an electrostatic charge bar 51, configured to transmit an amount of electrostatic charge to the outer side surface 31 of the sleeve 30 from the outside of the impression roller, preferably radially to the impression roller, preventing an electrical contact with said outer side surface 31 of said sleeve 30.
  • the outer sleeve layer 32 made of an elastomeric material is semi-conductive, and the predetermined electrical insulation resistance reference value of the sleeve 30 is preferably comprised between 0.85 GOhm and 1.15 GOhm, preferably about 1 GOhm.
  • 1 GOhm is understood to mean a resistance value of 1,000,000,000 Ohm, or 1 ⁇ 10 9 Ohm.
  • the sleeve 30 can comprise an inner sleeve layer 98 made of an electrically insulating material, delimited by said inner sleeve side surface 33.
  • said inner sleeve side surface 33 can comprise, according to one embodiment, an electrically conductive surface portion 96, electrically connected to said outer sleeve layer 32, for example, by means of an electrical resistance element 97, so that when the sleeve 30 is fitted onto the impression roller body 10, said electrically conductive surface portion 96 is in electrical contact with a corresponding conductive portion of said impression roller body side surface 13, said conductive portion of said impression roller body side surface 13 being connected to said electrical circuit 90.
  • said electrically conductive surface portion 96 is the radially inner surface of a conductive annular element 96' coaxial to the tubular sleeve 30, preferably incorporated in said inner sleeve layer 98.
  • the electrically conductive surface portion 96 is flush with said inner sleeve side surface 33.
  • the conductive annular element is made of carbon.
  • the impression roller body side surface 13, or at least a conductive portion of said impression roller body side surface 13, is connected to ground by means of a ground connection 95.
  • Such a ground connection 95 may be part of the electrical circuit 90.
  • the semi-conductivity of the sleeve 30 allows the charges distributed on the outer sleeve side surface 31, to cross the thickness of the sleeve 30 from the outer sleeve side surface 31 towards the inner sleeve side surface 33, through the impression roller body side surface 13, and then downwards through the electrical ground connection 95.
  • the surface resistance is preferably comprised between 0.5 Mohm and 15 Mohm, at a temperature comprised between about 30°C to 40°C.
  • the electrostatic charge bar 51 comprises a high voltage electrostatic charge generator, powered by low voltage, preferably at about 24 Volt.
  • such an electrostatic charge generator is integrated in said electrostatic charge bar 51.
  • the electrostatic printing assistance apparatus 50 and the checking apparatus 80 are both fixed to the support upright 60, preferably by means of a common support bracket 61.
  • the electrostatic charge bar 51 and the actuator 83 are both fixed to the support upright 60, preferably by means of a common support bracket 61.
  • the electrical insulation resistance checking apparatus 80 preferably the movement device 82, preferably the actuator 83, is constrained, or fixed, to said charge bar 51.
  • the electrostatic printing assistance apparatus 50 comprises a plurality of charge electrodes adapted to provide a predetermined voltage and to be crossed by a predetermined current during use.
  • the electrostatic printing assistance apparatus 50 comprises an electrostatic charge transmitter of the direct charging type 53, configured to transmit an amount of electrostatic charge to the outer side surface 31 of the sleeve 30 from the inside of the impression roller 10 towards the outside of the impression roller 10, preferably radially, through said sleeve 30, by means of a direct electrical connection between the electrostatic charge transmitter and the impression roller side surface 13.
  • the outer sleeve layer 32 made of an elastomeric material is preferably conductive, and the predetermined electrical insulation resistance reference value of the sleeve 30 is preferably comprised between 0.001 Ohm and 0.1 Ohm, preferably about 0.01 Ohm.
  • the sleeve 30 comprises an inner sleeve layer made of an electrically conducting material, delimited by said inner sleeve side surface 33, so that when the sleeve 30 is fitted onto the impression roller body 11, said inner sleeve layer puts the outer sleeve layer 32 in electrical contact with the impression roller body side surface 11.
  • the surface resistance value is comprised between 0.5 Mohm and 2 Mohm, at a temperature comprised between about 30°C and 40°C.
  • a direct-charging-type electrostatic charge transmitter 53 comprises an electrostatic charge generator, preferably integrated in the impression roller 10, or arranged axially in contact with said impression roller 10, or arranged at an axial end of the impression roller 10.
  • the electrostatic charge generator of the electrostatic charge transmitter of the direct-charging type 53 is adapted to be powered by low voltage, preferably at about 24 Volt.
  • the electrical power wires connected to the electrostatic charge generator integrated in the impression roller are powered by low voltage, thus avoiding the risks relating to the operating safety of the machine, which could be caused, instead, by high voltage.
  • the printing unit 1 comprises a pair of antistatic bars 70, of which a first antistatic bar 71 is arranged at the inlet, and a second antistatic bar 72 is arranged at the outlet, with respect to the impression roller 10 along a feeding direction 73 of a material 74 to be printed.
  • first antistatic bar 71 and the second antistatic bar 72 are arranged on opposite sides to the impression roller 10.
  • each of said first antistatic bar 71 and said second antistatic bar 72 comprises a plurality of electrodes adapted to face the material 74 and an electrostatic charge generator connected to said electrodes for remove electrostatic charges on said material 74 by means of said electrodes.
  • Each of said first antistatic bar and said second antistatic bar, or said generator are configured to provide said electrodes with an alternating sign voltage over time, so as to remove both positive and negative electrostatic charges from said material 74.
  • the electrodes of said plurality are in the shaper of metal tips.
  • the electrodes of said plurality are arranged on two parallel rows extending along a main direction of development of said first antistatic bar 71 and of said second antistatic bar 72.
  • the first antistatic bar 71 and the second antistatic bar 72 are powered by low voltage, preferably at about 24 Volt.
  • the first antistatic bar 71 and the second antistatic bar 72 each comprise a respective electrostatic charge generator therein.
  • the printing unit 1 comprises at least one tensioning roller 65, 66, arranged on at least one side to the impression roller 10, adapted to press on the material to be printed, so as to keep it tense.
  • the printing unit 1 comprises two tensioning rollers 65, 66, arranged on opposite sides to the impression roller 10, adapted to press on the material to be printed, so as to keep it tense.
  • a first roller 65 of said two guide rollers is interposed between the first antistatic bar 71 and the impression roller 10
  • a second roller 66 of said two guide rollers is interposed between the impression roller 10 and the second antistatic bar 72.
  • each of said at least one tensioning roller 65, 66, or each of said two tensioning rollers 65, 66 has a rotation axis parallel to the rotation axis of the impression roller 10.
  • the printing unit 1 comprises a printing roller 20, defining an outer side surface 21 of the printing roller and a rotation axis 22 of the printing roller.
  • the outer side surface 21 of the printing roller has a plurality of cavities, or small cells, having such a shape and arrangement as to mainly form a figure to be printed on the sheet or reel material 74.
  • the cavities, or small cells, are adapted to house therein an amount of ink 24, to be transferred onto the material 74, by means of pressure of the impression roller 10 against the printing roller 20.
  • the printing unit comprises a container tank 23 for ink 24, arranged so that the outer side surface 21 of the printing roller 20 can be wet by the ink 24 contained in the container tank 23, and so that the printing roller 20 may rotate about the rotation axis thereof 22.
  • the printing unit 1 comprises movement means for moving the impression roller 10 and for pressing it against the printing roller 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Rotary Presses (AREA)
  • Printing Methods (AREA)

Claims (12)

  1. Unité d'impression (1) pour héliogravure sur un matériau en feuille ou en bobine (74), comprenant :
    - un cylindre d'impression (10) comprenant un corps de cylindre d'impression (11) et un manchon de cylindre d'impression (30) ajusté,
    ou capable d'être ajusté, sur ledit corps de cylindre d'impression (11), ledit corps de cylindre d'impression (11) définissant un axe de rotation de cylindre d'impression (12) et une surface latérale de corps de cylindre d'impression (13) ;
    ledit manchon de cylindre d'impression (30) ayant une forme tubulaire qui définit une surface latérale externe de manchon (31) et une surface latérale interne de manchon (33), ledit manchon de cylindre d'impression (30) comprenant une couche externe (32) constituée d'un matériau élastomère délimitée par ladite surface latérale externe de manchon (31) ;
    - un appareil de contrôle (80) destiné à mesurer la résistance d'isolement électrique dudit cylindre d'impression (30) entre ladite surface latérale interne de manchon (33) et ladite surface latérale externe de manchon (31),
    ladite unité d'impression (1) étant caractérisée en ce que ledit appareil de contrôle (80) est associé en permanence à ladite unité d'impression (1),
    et comprend :
    - un élément de contact électrique (81) ;
    - un dispositif de déplacement (82) destiné à déplacer ledit élément de contact électrique (81) entre une position de mesure, dans laquelle l'élément de contact électrique (81) se trouve en contact avec la surface latérale externe de manchon (31), et une position de repos, dans laquelle ledit élément de contact électrique (81) n'est pas en contact avec la surface latérale externe de manchon (31) et est espacé de celle-ci ;
    - un circuit électrique (90) connecté audit élément de contact électrique (81) et capable d'être connecté à ladite surface latérale interne de manchon (33) lorsque ledit manchon (30) est ajusté sur ledit corps de cylindre d'impression (13), de sorte que lorsque l'élément de contact électrique (81) se trouve en contact avec la surface latérale externe de manchon (31), ledit circuit électrique (90) est fermé à travers ledit manchon de cylindre d'impression (30) entre ladite surface latérale interne de manchon (33) et ladite surface latérale externe de manchon (31) ; ledit circuit électrique (90) étant configuré pour fournir une valeur mesurée de résistance d'isolement électrique du manchon (30) entre ladite surface latérale interne de manchon (33) et ladite surface latérale externe de manchon (31).
  2. Unité d'impression (1) selon la revendication 1, dans laquelle ledit circuit électrique (90) comprend une entrée pour une source de tension électrique (91) et une unité de commande électronique (92) adaptée pour mesurer l'intensité électrique qui traverse ledit circuit électrique (90) et adaptée pour fournir ladite valeur mesurée de résistance d'isolement électrique du manchon (30) entre ladite surface latérale interne de manchon et ladite surface latérale externe de manchon (31) en fonction de ladite intensité électrique mesurée.
  3. Unité d'impression (1) selon la revendication 2, dans laquelle l'unité de commande électronique (92) comprend des moyens de comparaison configurés pour comparer ladite valeur de résistance d'isolement électrique mesurée à une valeur de référence de résistance d'isolement électrique prédéterminée du manchon (30).
  4. Unité d'impression (1) selon la revendication 3, comprenant un appareil d'assistance à l'impression électrostatique (50) associé audit cylindre d'impression (10) et configuré pour transmettre une charge électrostatique à ladite surface latérale externe de manchon (31),
    dans laquelle ladite unité de commande électronique (92) comprend des moyens d'activation configurés pour fournir un signal d'inhibition destiné à inhiber l'activation dudit appareil d'assistance à l'impression électrostatique (50) lorsque la valeur de résistance d'isolement électrique mesurée du manchon (30) diffère de la valeur de référence de résistance d'isolement électrique prédéterminée du manchon (30), et dans laquelle lesdits moyens d'activation sont configurés pour fournir un signal d'autorisation pour permettre l'activation dudit appareil d'assistance à l'impression électrostatique (50) lorsque la valeur de résistance d'isolement électrique mesurée du manchon (30) est égale, ou sensiblement égale, à la valeur de référence de résistance d'isolement électrique prédéterminée du manchon (30).
  5. Unité d'impression (1) selon au moins l'une des revendications précédentes, dans laquelle ledit circuit électrique (90) est connecté à ladite surface latérale interne de manchon (33), au moyen d'une connexion électrique entre ledit circuit électrique (90) et la surface latérale de corps de cylindre d'impression (13), lorsque ledit manchon est ajusté sur ledit corps de cylindre d'impression (11), ladite surface latérale interne de manchon (33) se trouvant en contact électrique avec ladite surface latérale de corps de cylindre d'impression (13).
  6. Unité d'impression (1) selon au moins l'une des revendications précédentes, dans laquelle le circuit électrique (90) est connecté à ladite surface latérale interne de manchon (33) au moyen d'une connexion électrique de masse (100).
  7. Unité d'impression (1) selon au moins l'une des revendications 4 à 6, dans laquelle l'appareil d'assistance à l'impression électrostatique (50) comprend une barre de charge électrostatique sans contact ou à chargement par le dessus (51), configurée pour transmettre une quantité de charge électrostatique sur la surface latérale externe (31) du manchon (30) depuis l'extérieur du cylindre d'impression, évitant ainsi un contact électrique avec ladite surface latérale externe (31) dudit manchon (30).
  8. Unité d'impression (1) selon la revendication 7, dans laquelle la couche externe du manchon (32) réalisée en matériau élastomère est semi-conductrice, et dans laquelle la valeur de référence prédéterminée de résistance d'isolement électrique du manchon (30) est comprise entre 0,85 GOhm et 1,15 GOhm, de préférence est d'environ 1 GOhm.
  9. Unité d'impression (1) selon la revendication 8, dans laquelle le manchon (30) comprend une couche interne de manchon (98) réalisée en matériau électriquement isolant, délimitée par ladite surface latérale interne de manchon (33), ladite surface latérale interne de manchon (33) comprenant une partie de surface électriquement conductrice (96) connectée électriquement à ladite couche externe de manchon (32) de sorte que, lorsque le manchon (30) est ajusté sur le corps de cylindre d'impression (10), ladite partie de surface électriquement conductrice (96) se trouve en contact électrique avec une partie conductrice correspondante de ladite surface latérale de corps de cylindre d'impression (13), ladite partie conductrice de ladite surface latérale de corps de cylindre d'impression (13) étant connectée audit circuit électrique (90).
  10. Unité d'impression (1) selon au moins l'une des revendications 1 à 6, dans laquelle l'appareil d'assistance à l'impression électrostatique (50) comprend un émetteur de charge électrostatique (53) du type à charge directe, configuré pour transmettre une quantité de charge électrostatique à la surface latérale externe (31) du manchon (30) depuis l'intérieur du cylindre d'impression (10) vers l'extérieur du cylindre d'impression (10), à travers ledit manchon (30), au moyen d'une connexion électrique directe entre l'émetteur de charge électrostatique et la surface latérale de cylindre d'impression (13).
  11. Unité d'impression (1) selon la revendication 10, dans laquelle la couche externe de manchon (32) réalisée en matériau élastomère est conductrice, et dans laquelle la valeur de référence prédéterminée de résistance d'isolement électrique du manchon (30) est comprise entre 0,001 Ohm et 0,1 Ohm, de préférence est d'environ 0,01 Ohm.
  12. Unité d'impression (1) selon la revendication 11, dans laquelle le manchon (30) comprend une couche interne de manchon réalisée en matériau électriquement conducteur, délimitée par ladite surface latérale interne de manchon (33), de sorte que lorsque le manchon (30) est ajusté sur le corps de cylindre d'impression (11), ladite couche interne de manchon met la couche de manchon externe (32) en contact électrique avec la surface latérale du corps de cylindre d'impression (11).
EP20174881.1A 2019-05-21 2020-05-15 Unité d'impression par rotogravure ayant une sécurité de fonctionnement élevée Active EP3741563B1 (fr)

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JP7054114B2 (ja) * 2019-09-13 2022-04-13 富士機械工業株式会社 インキ飛散防止カバー

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DE1923226A1 (de) * 1969-05-07 1970-11-19 Fritsch Dr Ing Klaus Verfahren zur elektrostatischen Farbuebertragung in Rotationstiefdruckmaschinen
EP0850759A1 (fr) * 1996-10-11 1998-07-01 Shinko Co., Ltd. Dispositif auxiliaire électrostatique de l'impression avec un détecteur de lacontamination
US6166550A (en) * 1998-11-16 2000-12-26 Xerox Corporation Charge measuring instrument
DE102008006269B3 (de) * 2008-01-25 2009-05-14 Eltex-Elektrostatik Gmbh Presseur sowie dessen Verwendung
DE202016101601U1 (de) * 2016-03-23 2017-06-27 Christa Dettke Aufwickelvorrichtung zum Aufwickeln eines im Wesentlichen isolierenden Bahnmaterials
ITUA20162595A1 (it) * 2016-04-14 2017-10-14 Ace Di Barbui Davide & Figli Srl Apparecchiatura per l'assistenza elettrostatica alla stampa a rotocalco.

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