Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F9/00—Rotary intaglio printing presses
  • B41F9/06—Details
  • B41F9/08—Wiping mechanisms
  • B41F9/10—Doctors, scrapers, or like devices
  • B41F9/1018—Doctors, scrapers, or like devices using a wiping cylinder
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F9/00—Rotary intaglio printing presses
  • B41F9/06—Details
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
  • B41F31/02—Ducts, containers, supply or metering devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
  • B41F31/20—Ink-removing or collecting devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F9/00—Rotary intaglio printing presses
  • B41F9/02—Rotary intaglio printing presses for multicolour printing
  • B41F9/021—Sheet printing presses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F9/00—Rotary intaglio printing presses
  • B41F9/06—Details
  • B41F9/061—Inking devices
  • B41F9/063—Using inking rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F9/00—Rotary intaglio printing presses
  • B41F9/06—Details
  • B41F9/08—Wiping mechanisms
  • B41F9/10—Doctors, scrapers, or like devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F9/00—Rotary intaglio printing presses
  • B41F9/06—Details
  • B41F9/08—Wiping mechanisms
  • B41F9/16—Removing or recovering ink from wiping mechanisms

Definitions

• the present invention concerns an inking system for an intaglio printing machine printing securities, such as banknotes, checks, passports, ID and other similar objects.
• the state of the art for intaglio printing machines and process provides an inking system with a rough regulation of the ink amount along the axis of the printing cylinder but with no means for regulation around the circumferential surface of the cylinder.
• a blanket cylinder for an intaglio printing machine is made with different layers, each with different properties. Said layers are engraved and may be lipophilic and/or lipophobic thus achieving a very precise inking of the plate cylinder.
• Figure 1 shows a first embodiment of the inking system according to the present invention.
• Figure 2 shows a second embodiment of the inking system according to the present invention with a first configuration of printing machine.
• Figure 2b shows a variant of the configuration of figure 2.
• Figure 3 shows another configuration of a printing machine with the inking system according to the invention.
• Figure 4 shows a further configuration of a printing machine with the inking system according to the invention.
• Figure 5 shows a multicolor configuration of a printing machine with the inking system according to the invention.
• FIG 1 a first embodiment of the inking system according to the invention is shown.
• a duct generally shown with the reference 1, said duct comprising a duct roller 2, an ink adjusting blade 3 for the duct roller 2 and an ink supply 4.
• the duct roller inks a selective inking cylinder 5 which has an engraved surface.
• the surface of the selective inking cylinder 5 can be directly engraved or, preferably, the cylinder carries an engraved plate with engravings corresponding to the pattern that has to be inked in the given color.
• the inking cylinder comprises a pit 7 in which clamping means (not shown) are provided to hold the plate 6 in position.
• the inking system further comprises a wiping roller 8, preferably a dry wiping roller, which is used to wipe the surface of the inking cylinder 5: thus only ink present in the engravings of the inking cylinder 5 remain and the ink present on the non-engraved surface of the cylinder 5 is almost completely removed.
• the wiping system further comprises a scraping blade 9 for scraping the surface of the wiping roller and the ink thus scraped is recuperated in the ink supply 4 as shown in figure 1.
• the ink supply function of the duct is separated from the ink thickness adjusting function.
• the duct roller 2 supplies an excess of ink to the selective inking cylinder 5 by means of the duct blade 3.
• the latter does not need to be equipped with adjusting screws, because there is no need of axial regulation of the amount of ink.
• the space between the duct blade 3 and the duct roller 2 does not need to be precisely adjusted. As an example, if the maximum required amount of ink requires a space of say 80 microns, the space can be adjusted with a wide excess tolerance, say 100-300 microns. This is because the duct roller 2 has no ink adjusting function.
• the duct roller 2 is preferably coated with hard rubber or plastic (for example PVC 50° ShD) .
• It is removable from the press for maintenance or replacement and is equipped with state of the art means to adjust the contact with the selective inking cylinder 5 and is provided with liquid circulation for thermoregulation. Additionally, it is preferably equipped with a fast automatic on/off movement actuated at each revolution in order to avoid that the ink is transferred to the plate near the bending position.
• the selective inking cylinder 5 has the function of ink adjusting and is equipped, as mentioned above, with a plate clamping device for an engraved plate 6, usually a chromed nickel plate.
• the engraved plate 6 is in rolling contact with the duct roller 2 and receives an excess of ink from it, the ink being transferred to both the engraved recesses of the plate 6 and the plate surface. After the action of the dry wiping roller 8, each point of the engraved plate carries the exact amount (or a slight excess) of ink required for the intaglio printing process.
• the dry wiping roller 8 is above the duct roller 2 and is in contact with the selective inking cylinder 5 and rotates in the same direction so that the two surfaces in contact run in opposite directions .
• the dry wiping roller 8 removes the excess of ink from the plate 6 surface, leaving ink in the engravings.
• the excess of ink is transferred to the surface, of the dry wiping roller 8 and a scraping blade 9 removes the largest part of the ink from the wiping roller 8 surface.
• the removed ink falls by gravity into the duct 1 and can thus be recycled.
• Both, dry wiping roller 8 and scraping blade 9, are equipped with non synchronized axial movement, in order to even the wear of the roller surface.
• This is preferably coated with hard rubber or plastic (for example PVC at 50° ShD) and provided with thermoregulation (known in the art) .
• the dry wiping roller 8 is preferably driven by an independent motor, to optimise the rotating speed in order to minimise the amount of ink left on the non engraved area of the selective inking plate 6. This is in the range of a few microns thickness.
• the scraping blade 9 is preferably in steel coated with ceramic.
• the surface of the dry wiping roller can be alternatively coated with a layer of ink repellent material in order to increase the amount of recycled ink which falls into the duct by the combined forces of gravity and centrifugation.
• the duct 10 comprises an ink chamber 11 with an ink spraying device 12 that sprays on a duct roller 13.
• an ink spraying device 12 that sprays on a duct roller 13.
• the ink spraying is synchronized with the duct roller rotation in order to avoid ink application in the non-engraved area of the duct roller and in the roller pit in presence of a plate clamping arrangement.
• a wiping system with a wiping roller 8 and a scraping blade 9.
• recuperating means are provided such as a tank 14 with pump means 15 to bring the recuperated ink into the circuit of ink being sprayed.
• the printing machine represented is an indirect inking intaglio printing machine.
• the engraved duct with engravings corresponding to the engravings of a plate cylinder 16, transfers the ink of the engravings onto a chablon roller 17 with reliefs 18 corresponding to the parts to be inked, said reliefs 18 transferring the ink to a collector cylinder 19 before being transferred to the plates of the plate cylinder 16.
• the same collector cylinder 19 can receive the inks of different colors from other inking units and chablon rollers not shown in figure 2 but similar to the inking unit represented.
• FIG 2b a variant of the configuration of figure 2 is shown.
• identical elements are identified with the same reference numbers.
• This variant differs from the configuration of figure 2 in the fact that the collector cylinder 19 of figure 2 is removed, thus forming a direct inking configuration.
• this variant comprises a duct 10, with an ink chamber 11 and a ink spraying device 12 on the duct roller 13. Under the spraying system, there is a wiping system with wiping roller 8, and scraping blade 9 and recuperating means, for example a tank 14 with pump means 15, for the scraped ink.
• FIG 3 a configuration of a printing machine with the inking system according to the invention is shown.
• the machine has a direct inking of an intaglio printing plate.
• the inking part of the machine is the one disclosed in figure 1, with similar elements referenced in an identical way. Accordingly, there is the duct 1, the duct roller 2, the duct blade 3, the duct roller 2 inking the plate 6 of the selective inking cylinder 5, which preferably carries an engraved plate 6, and the wiping roller 8 wiping the surface of the selective inking cylinder 5.
• the surface of the wiping roller 8 is scraped by scrape blade 9 and the ink thus scraped is recuperated in the duct 1.
• the selective inking cylinder 5 inks then a transfer roller 20 with a deformable surface in order to penetrate the engravings of the plate 6, said transfer roller transferring the ink to a chablon roller 21 with reliefs 22 which then in turn deposit the ink directly in the engravings of a plate of the plate cylinder 23 of the printing machine.
• FIG 4 another configuration of a printing machine is shown.
• the machine is an indirect inking intaglio printing machine.
• the inking system represented is similar to the inking system of figure 1 or 3, with similar elements referenced in an identical way. Accordingly, there is the duct 1, the duct roller 2, the duct blade 3, the duct roller 2 inking the surface of the selective inking cylinder 5, which is engraved or carries an engraved plate 6, and the wiping roller 8 wiping the surface of the selective inking cylinder 5.
• the surface of the wiping roller 8 is scraped by scrape blade 9 and the ink thus scraped is recuperated in the duct 1.
• the selective inking cylinder 5 inks then a chablon roller 24 with reliefs 25 which then in turn deposits the ink on a collector cylinder 26.
• the collector cylinder 26 then deposits the ink in the engravings 27 of a plate cylinder 28 of the printing machine.
• the plate cylinder 28 carries three plates.
• a wiping unit 45 which is per se common in the art of printing machines, takes off a minimal excess of ink from the engravings and from the plate sur ace .
• a sheet 29 being printed is shown in this figure 4, said sheet passing through the printing nip 30 formed between the plate cylinder and the impression cylinder 31, as is common in the art of intaglio printing.
• the system according to the present invention is also suitable for web-fed printing machines.
• the configuration of printing machine disclosed in figure 5, corresponds to a four color indirect inking intaglio printing machine.
• Each inking unit comprises a duct roller 2, an ink supply and a duct blade 3. Ink is applied to the selective inking cylinders 34, 35, 36 and 37 and wiped by wiping roller 8 in the manner described above.
• Each selective inking cylinders 34, 35, 36 and 37 receives ink of a different color and has engravings corresponding to the desired pattern on the plate of the plate cylinder 39, and the ink is transferred onto the chablon rollers 40, 41, 42, and 43 of each inking unit .
• the selective inking cylinders 34, 35, 36 and 37 may have only the pattern engraved which correspond to the color the selective inking cylinders in meant to transfer.
• the selective inking cylinders 34, 35, 36 and 37 can be all engraved with the same pattern corresponding to the entire pattern of the plate cylinder 39. In this case the entire pattern receive a different color on said selective inking cylinders 34, 35, 36 and 37 but the selection of ink on each of said selective inking cylinders 34, 35, 36 and 37 is made by the chablon rollers 40-43 to transfer only the necessary ink on the collector cylinder 44.
• the advantage of this configuration is that selective inking cylinders are all identical which reduces the cost of manufacturing.
• each chablon roller 40, 41, 42, and 43 is transferred onto the collector cylinder 44 which in turn inks the engravings 38 of the plate cylinder 39.
• a wiping unit 45 which is per se common in the art of printing machines, takes off a minimal excess of ink from the engravings and from the plate surface.
• the printing process per se is then carried out on a sheet 40 which passes in a printing nip 41 formed between the plate cylinder 39 and the impression cylinder 42, as is known in the art of printing.
• the inking system of the present invention has numerous advantages, such as its simplicity and the important saving of ink it allows. No important quantities of ink are wasted anymore since there is a wiping right at the level of the ink duct rather than on the plate cylinder where all the colors of ink are then mixed up by the wiping operation and can not be reused. In the present case, only a minimal excess of ink is effectively transferred onto the plate cylinder so a minimal quantity of ink is wiped away and lost.
• the chablon rollers are prepared in a conventional way (chablon plate or continuous cylinder) .
• An advantage of the present invention is that the edges of the area patterns of the chablon rollers receive a minimal amount of ink - a few microns thickness. Therefore, the ink does not build up from the edges to the recessed portion of the chablon plate and washing is much easier for the operato .
• the engraved selective inking cylinders according to the present invention comprise engravings not just corresponding to those of the printing plate, but having lines characterised by.
• the engravings on the selective inking cylinders have a depth which is for instance of the order of 30% greater than the depth of the engravings on the printing plate so as to guarantee that an adequate amount of ink is transferred to the printing plate
• the wiping system may be adapted to leave a slight amount of ink on non-engraved areas of the corresponding selective inking cylinder, which amount of ink can be sufficient to ink fine engravings on the plate cylinder.
• parts of the surface of the selective inking cylinder (s) which correspond to fine engravings on the plate cylinder may not be provided with any engravings at all, since non-engraved areas of the selective inking cylinder (s) could carry a sufficient amount of ink to ink such fine engravings .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Rotary Presses (AREA)
• Coating Apparatus (AREA)

Priority Applications (2)

Applications Claiming Priority (3)

Related Child Applications (2)

Publications (2)

Family

ID=34854547

Family Applications (2)

Family Applications Before (1)

Country Status (10)

Cited By (1)

Families Citing this family (39)

Family Cites Families (22)

• 2005
  • 2005-01-05 CN CN2008101304901A patent/CN101357526B/zh not_active Expired - Fee Related
  • 2005-01-05 EP EP06014533.1A patent/EP1717025B1/de not_active Expired - Lifetime
  • 2005-01-05 AU AU2005211994A patent/AU2005211994B2/en not_active Ceased
  • 2005-01-05 ES ES06014533.1T patent/ES2577304T3/es not_active Expired - Lifetime
  • 2005-01-05 WO PCT/IB2005/000027 patent/WO2005077656A1/en not_active Ceased
  • 2005-01-05 CN CN2008101304916A patent/CN101318397B/zh not_active Expired - Fee Related
  • 2005-01-05 EP EP05702198.2A patent/EP1704052B1/de not_active Expired - Lifetime
  • 2005-01-05 CA CA2552634A patent/CA2552634C/en not_active Expired - Fee Related
  • 2005-01-05 PL PL06014533.1T patent/PL1717025T3/pl unknown
  • 2005-01-05 CN CNB2005800024096A patent/CN100457453C/zh not_active Expired - Fee Related
  • 2005-01-05 RU RU2009106141/12A patent/RU2490136C2/ru not_active IP Right Cessation
  • 2005-01-05 KR KR1020067015127A patent/KR101228025B1/ko not_active Expired - Fee Related
  • 2005-01-05 JP JP2006548461A patent/JP2007517692A/ja active Pending
  • 2005-01-05 RU RU2006129497/12A patent/RU2367574C2/ru not_active IP Right Cessation
• 2009
  • 2009-02-20 RU RU2009106143/12A patent/RU2490137C2/ru not_active IP Right Cessation
• 2011
  • 2011-08-12 JP JP2011176955A patent/JP5539935B2/ja not_active Expired - Lifetime
• 2013
  • 2013-08-02 JP JP2013161293A patent/JP5540143B2/ja not_active Expired - Lifetime

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events