EP2360017A2 - Verbessertes Rakel-/Rückhaltemesser für eine Druckerpresse - Google Patents

Verbessertes Rakel-/Rückhaltemesser für eine Druckerpresse Download PDF

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Publication number
EP2360017A2
EP2360017A2 EP11154837A EP11154837A EP2360017A2 EP 2360017 A2 EP2360017 A2 EP 2360017A2 EP 11154837 A EP11154837 A EP 11154837A EP 11154837 A EP11154837 A EP 11154837A EP 2360017 A2 EP2360017 A2 EP 2360017A2
Authority
EP
European Patent Office
Prior art keywords
blade
seal
wear element
roll
thin plate
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Withdrawn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
EP11154837A
Other languages
English (en)
French (fr)
Other versions
EP2360017A3 (de
Inventor
Mark E. Van Denend
Kenneth Steven Friedman
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.)
Provident Group Inc
Original Assignee
Provident Group Inc
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 Provident Group Inc filed Critical Provident Group Inc
Publication of EP2360017A2 publication Critical patent/EP2360017A2/de
Publication of EP2360017A3 publication Critical patent/EP2360017A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B41F31/027—Ink rail devices for inking ink rollers

Definitions

  • the present invention relates to a sealing assembly for an ink chamber associated with an anilox roll and chamber blade assembly, and more particularly, is directed to an improved doctor/containment blade with an improved blade/seal area between the doctor blade and containment blade and the chamber seal.
  • an ink transfer or anilox roll transfers ink to an adjacent plate roll for printing.
  • Ink is supplied to the anilox roll from an ink chamber defined by a chamber housing which partially surrounds the anilox roll. Specifically, ink is supplied through an ink supply tube and then through an ink supply line in the chamber housing, into the ink chamber. In like manner, ink is removed from the ink chamber through an ink return line in the chamber housing and then through an ink return tube.
  • doctor and containment blades are provided at the exit and entry positions of the anilox roll relative to the ink chamber.
  • the blades are fixed to the chamber housing so that the blades overhang the chamber housing and contact the anilox roll.
  • the outer surface of the anilox roll passes through the ink chamber and picks up ink for printing.
  • the ink is metered by means of the doctor blade held to the outlet end of the chamber housing, and sealed with a containment blade held to the inlet end, with the free ends of the blades being in contact with the outer surface of the anilox roll.
  • a seal is provided at each end of the blade, that is, at each end of an anilox roll for sealing the ends thereof. Examples of such arrangements are shown in U.S. Patent Nos. 6,739,248 ; 6,672,207 ; 6,598,525 ; 5,983,797 ; 5,735,210 ; 5,662,042 ; and 5,150,651 .
  • doctor blades used in such arrangement are shown in U.S. Patent Nos. 5,638,751 and 6,546,861 .
  • Each seal is formed by a compressible or deformable body. Since the seals provided at each end of the anilox roll function to seal the ends of the ink chamber, each seal must lie against the peripheral surface of the rotating anilox roller. As a result, each seal is therefore exposed to mechanical stresses as well as wear. Further, during the printing operation, the blades, which press against the anilox roll, also wear. The geometry of the sealing function between the anilox roll, the two blades and the end seal changes.
  • each end of a blade sits upon a flat supporting area of the respective seal.
  • a gap may be created at the opposite ends of the blades where they are held by the chamber seals.
  • there is uneven wear on the ends of the blades adjacent the seals which tends to cause leakage of ink at the ends of the anilox roll.
  • the sealing and doctor blades may flex or bow outwardly relative to the flat supporting area of the seal, due in part to the flimsiness of the thin blades, pressure on the blades, dried ink under the blades, fluid pressure in the chamber, etc.
  • the areas where the anilox roll, blades and seals join are susceptible to leakage because of geometric changes.
  • a reinforced blade for use with a chamber blade assembly adjacent a portion of a roll and end seals for sealing ends of the chamber blade assembly.
  • the reinforced blade includes an elongated thin plate having opposite ends adapted to lie against the end seals, the elongated thin plate having a lengthwise direction.
  • the elongated thin plate includes a roll contact portion extending in the lengthwise direction and adapted for contact with the roll, a clamping portion opposite the roll contact portion which is adapted to be clamped, and an unclamped portion between the roll contact portion and the clamping portion.
  • the reinforced blade further includes a wear element which increases the stiffness and/or wear of the thin plate, the wear element mounted to a surface of the thin plate at least at a position corresponding to the end seals, such that a thickness of the reinforced blade is greater at the opposite ends thereof which are adapted to lie against the seals than at positions thereof between the end seals.
  • the wear element preferably extends in a lengthwise direction of the thin plate for a distance at least equal to a dimension of a respective the seal in the lengthwise direction.
  • the wear element is positioned substantially only in superposition with respect to the seal.
  • the wear element is a plate material made from the same material as the blade, and has a thickness at least equal to a thickness of the blade.
  • the wear element is spaced close to the roll contact portion of the blade, or even extends to the roll contact portion of the blade.
  • the seal includes a concave surface adapted to lie against a peripheral surface of the anilox roll, and downwardly sloping flat supporting surfaces which continue at an angle from opposite edges of the upper concave surface.
  • the thin plate includes a main section adapted to be supported on a respective downwardly sloping flat supporting surface.
  • the thin plate can have an extra width section adapted to be positioned between the anilox roll and the seal when the main section of the thin plate is supported on the respective the downwardly sloping flat supporting surface, such that the extra width section is angled relative to the main section.
  • the wear element is positioned on the main section.
  • the seal is made of a compressible or deformable material such that the extra width section compresses the material of the seal and an inner surface of the extra width section is substantially coextensive with an inner surface of the seal.
  • a conventional sealing assembly 10 for doctor and containment blades Conventionally, in printing machines, such as flexographic printing machines, an ink transfer or anilox roll 12 transfers ink to an adjacent plate roll (not shown) for printing. Ink is supplied to anilox roll 12 from an ink chamber 14 defined by a chamber housing 16 which is adjacent to and may partially surrounds anilox roll 12. Anilox roll 12 rotates in the direction of arrow 12a.
  • an elongated sealing or containment blade 18 and an elongated doctor blade 20 are provided at the entry and exit positions of anilox roll 12 relative to ink chamber 14.
  • Blades 18 and 20 each include a clamping portion that is fixed to chamber housing 16 by a blade holder (not shown) at a position beyond the chamber housing 16, as is well known in the art, so that blades 18 and 20 overhang chamber housing 16 and contact anilox roll 12.
  • Blades 18 and 20 are placed at an angle against the periphery of anilox roll 12 and help to define ink chamber 14 which extends along the length of anilox roll 12.
  • Seals 22 are provided at each end of anilox roll 12 to seal the ends of ink chamber 14.
  • Each seal 22 has an upper concave surface 22a which lies against the peripheral surface of the rotating anilox roll 12.
  • the edges of upper concave surface 22a continue in downwardly sloping supporting surfaces 22b and 22c which support blades 18 and 20, respectively.
  • anilox roll 12 passes through ink chamber 14 and picks up ink for printing.
  • the ink is metered by means of doctor blade 20 held to the outlet end of chamber housing 16, and sealed with containment blade 18 held to the inlet end, with the roll contact portions, that is, the free contact edges, of blades 18 and 20 being in contact with the outer surface of anilox roll 12.
  • each end of blades 18 and 20 sits upon a supporting surface 22b or 22c of a respective seal 22.
  • a gap may be created at the opposite ends of the blades 18 and 20 where they are in contact with the chamber seal 22.
  • the sealing and doctor blades 18 and 20 may flex or bow outwardly relative to the supporting surfaces 22b and 22c of the respective seal 22, as shown in Fig. 3 .
  • the areas where anilox roll 12, blades 18 and 20 and seals 22 join are susceptible to leakage because of geometric changes.
  • blades 18, 20 each include a wear element 21 fixedly mounted thereon at a position at or spaced slightly from the initial roll contact portion of each blade 18, 20 with anilox roll 12, and positioned at least in the area where each blade 18, 20 lies on downwardly sloping flat supporting surfaces 22b and 22c of seal 22, and may even extend into the clamped portions thereof.
  • each wear element 21 extends in the lengthwise direction of each blade 18, 20 so as to at least partially overlap downwardly sloping flat supporting surfaces 22b and 22c in that lengthwise direction.
  • each wear element 21 can be less than or greater than the dimension of each downwardly sloping flat supporting surface 22b and 22c in the lengthwise direction of each blade 18, 20. If wear element 21 also extends, for example, partially or entirely across the entire blade, it is important that wear element 21 have a greater thickness in areas where it overlaps downwardly sloping flat supporting surfaces 22b and 22c. Thus, it will be appreciated that, even if wear elements 21 extend between the seal areas, the thickness of wear elements 21 is greatest at the seal areas, so that the rigidity of blades 18, 20 is increased greatly at the seal areas.
  • each wear element 21 preferably extends to the outer edge of the respective flat supporting surface 22b and 22c, but is not limited thereto, and may vary in width therefrom.
  • Each wear element 21 can be of any suitable thickness.
  • Wear element 21 can be made of any suitable material, such as the same material as blades 18, 20.
  • each wear element 21 With wear elements 21 added to each blade 18, 20, the rigidity of each blade 18, 20 at downwardly sloping flat supporting surfaces 22b and 22c of seal 22, is increased. As a result, there is much less tendency for each blade 18, 20 to bow at the position of seals 22. In effect, each wear element 21 inhibits or prevents ink from entering into the area between blades 18, 20 and downwardly sloping flat supporting surfaces 22b and 22c of seals 22, thereby inhibiting or preventing leakage of ink at the seal areas.
  • the respective blade 18, 20 may wear down faster than at areas between the seal areas where the blades 18, 20 are in contact with anilox roll 12, since there is little or no lubricating ink at the seal areas.
  • an opening may develop in each blade 18, 20 at the seal areas through which ink can leak, particularly if the blades 18, 20 are bowed outwardly.
  • This ink leakage under the blades 18, 20 tends to push the respective blades 18, 20 further away from downwardly sloping flat supporting surfaces 22b and 22c of seal 22, which results in further leakage of ink thereat.
  • wear element 21 is preferably secured to blades 18, 20, it may be provided as a separate element held by the machine and which lies against the same area of blades 18, 20 described herein. Therefore, reference to wear element 21 being Amounted@ refers to wear element 21 being fixed to blades 18, 20, or as a separate element pressed thereagainst.
  • each wear element 21 functions to increase the wear life of the blade, while also preventing or inhibiting back blading. Specifically, the section of extra width portion 18a that would normally lie between anilox roll 12 and seal 22 is not cut away, eliminating the costliness and complexity of manufacturing each blade.
  • extra width portion 18a is also positioned between anilox roll 12 and seal 22, as shown in Figs. 7 and 8 .
  • extra width portion 18a sinks into the compressible or deformable material of seal 22 so that the inner surface of extra width portion 18a is flush or coextensive with the inner arcuate surface 22a of seal 22.
  • seal 22 is made of any suitable deformable or compressible material, such as felt, a closed cell foam or an elastomeric material having a desired durometer.
  • the pressure of anilox roll 12 on extra width portion 18a results in wear of this extra width portion 18a, creating an open area 19, as shown in Fig. 9 .
  • This wearing of containment blade 18 at this position results in wearing away open area 19 ( Fig. 9 ) of blade 18 through which ink can leak between blade 18 and end seals 22 at the ends of anilox roll 12. Because there is uneven wear of blade 18 adjacent seals 22, this would normally tend to cause leakage of ink at the ends of anilox roll 12.
  • the present invention provides that the material of blade 18 is sufficiently flexible to bend and pass between anilox roll 12 and seal 22, while made sufficiently rigid by wear element 21 to prevent leakage beneath blade 18, even when worn away to provide an open area 19 thereof.
  • wear element 21 has been shown mounted on the outer surface of each blade 18, 20 outside of the ink chamber, it can be mounted on the inner surface within the ink chamber.

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  • Rotary Presses (AREA)
  • Paper (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP11154837A 2010-02-23 2011-02-17 Verbessertes Rakel-/Rückhaltemesser für eine Druckerpresse Withdrawn EP2360017A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71076310A 2010-02-23 2010-02-23

Publications (2)

Publication Number Publication Date
EP2360017A2 true EP2360017A2 (de) 2011-08-24
EP2360017A3 EP2360017A3 (de) 2012-07-18

Family

ID=44019160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11154837A Withdrawn EP2360017A3 (de) 2010-02-23 2011-02-17 Verbessertes Rakel-/Rückhaltemesser für eine Druckerpresse

Country Status (1)

Country Link
EP (1) EP2360017A3 (de)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5150651A (en) 1991-06-10 1992-09-29 Flores Carlos R Doctor-blade assembly for flexographic press
US5638751A (en) 1994-10-26 1997-06-17 Max Daetwyler Corporation Integrated doctor blade and back-up blade
US5662042A (en) 1996-06-10 1997-09-02 Paper Converting Machine Co. Method of operating ink unit for printing press
US5735210A (en) 1995-05-03 1998-04-07 Windmoller & Holscher Doctor blade unit for the inking system of a rotary printing press
US5983797A (en) 1997-11-17 1999-11-16 Howard W. DeMoore End seal engaging bearer of anilox roller assembly
US6546861B2 (en) 2001-07-30 2003-04-15 Goss Graphic Systems, Inc. Printing press scraping blade
US6598525B2 (en) 1999-11-29 2003-07-29 Heidelberger Druckmaschinen Ag Device for sealing off an ink supply on printing machines
US6672207B2 (en) 2002-02-08 2004-01-06 Fischer & Krecke Gmbh & Co. Seal for chambered doctor blade
US6739248B2 (en) 2002-02-08 2004-05-25 Fischer & Krecke Gmbh & Co. Seal for chambered doctor blade

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0000215L (sv) * 2000-01-25 2001-07-26 Btg Eclepens Sa Rakelknive
US20090193990A1 (en) * 2008-02-06 2009-08-06 Van Denend Mark E Seal for an Ink Chamber with Improved Blade/Seal Area

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5150651A (en) 1991-06-10 1992-09-29 Flores Carlos R Doctor-blade assembly for flexographic press
US5638751A (en) 1994-10-26 1997-06-17 Max Daetwyler Corporation Integrated doctor blade and back-up blade
US5735210A (en) 1995-05-03 1998-04-07 Windmoller & Holscher Doctor blade unit for the inking system of a rotary printing press
US5662042A (en) 1996-06-10 1997-09-02 Paper Converting Machine Co. Method of operating ink unit for printing press
US5983797A (en) 1997-11-17 1999-11-16 Howard W. DeMoore End seal engaging bearer of anilox roller assembly
US6598525B2 (en) 1999-11-29 2003-07-29 Heidelberger Druckmaschinen Ag Device for sealing off an ink supply on printing machines
US6546861B2 (en) 2001-07-30 2003-04-15 Goss Graphic Systems, Inc. Printing press scraping blade
US6672207B2 (en) 2002-02-08 2004-01-06 Fischer & Krecke Gmbh & Co. Seal for chambered doctor blade
US6739248B2 (en) 2002-02-08 2004-05-25 Fischer & Krecke Gmbh & Co. Seal for chambered doctor blade

Also Published As

Publication number Publication date
EP2360017A3 (de) 2012-07-18

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