US2995084A - Damping device for offset printing machines - Google Patents

Damping device for offset printing machines Download PDF

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Publication number
US2995084A
US2995084A US743556A US74355658A US2995084A US 2995084 A US2995084 A US 2995084A US 743556 A US743556 A US 743556A US 74355658 A US74355658 A US 74355658A US 2995084 A US2995084 A US 2995084A
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US
United States
Prior art keywords
liquid
roller
chamber
damping
bath
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Expired - Lifetime
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US743556A
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English (en)
Inventor
Mosegaard Marius
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ALLER PRESS AS
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ALLER PRESS AS
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Publication date
Application filed by ALLER PRESS AS filed Critical ALLER PRESS AS
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/30—Damping devices using spraying elements

Definitions

  • This invention relates to a damping device -for use in offset printing machines, and especially rotary printing machines, comprising a damping roller which transfers the damping liquid directly or indirectly to the plate cylinder.
  • a cylindrical body which is partly submerged in a bath of the liquid and is arranged to be rotated at such a speed that it serves as a throwing roller and throws the liquid against the damping roller.
  • the throwing roller may be located in a box, having a longitudinal slot facing the damping roller.
  • the distribution of liquid along the axial length of the damping roller can be regulated by providing along the length of the slot a number of shutters which are individually adjustable.
  • ⁇ it ⁇ indicates the plate cylinder of a rotary offset lithographic printing machine to the plate on which cylinder a certain quantity of liquid, usually water, is transferred by a damping roller 12 which in known manner has a suitable coating touching the surface of the printing plate which is clamped round the plate cylinder as is usual in the case of offset printing.
  • a throwing roller 14 is provided; this roller dips into a bath 16 of the wetting liquid contained in a vessel 18.
  • a coating 2t) of a perforated plate may be applied to the surface of the roller.
  • the roller 14 is driven from the driving mechanism of the printing machine so as to rotate in a counterclockwise direction as seen in the drawing, this drive being eected preferably through a variable gear device, at such a speed that the liquid ad- Yattent Patented Aug. 8, 1961 hering to the roller is thrown out by centrifugal force, as is indicated in the drawing.
  • the vessel 18 constitutes part of the bottom of a box 22, which is shaped as shown and has at the side facing the ⁇ damping roller 12 a narrow longitudinal slot 24, through which some part of the thrown liquid passes direct to the surface of the damping roller which in its rotation carries that liquid to the plate on the cylinder 10;
  • the width of the slot 24 can be adjusted by defining one of its edges by a shutter 26 which can be moved by one or more adjusting screws 28 which are held against axial movement in brackets 30 and have their screw threads engaging corresponding threaded holes in lugs 32 at the rear side of the damper 26.
  • the box 22 and the vessel 18 attached thereto can bey swung on fixed pivots 34 journalled in bearing brackets 36 attached to the ⁇ front of the box. Adjustment about the pivots is effected by an adjusting screw 38 which is mounted for rotation but not axial movement in a fixed bracket 40, the screwed part engaging corresponding threaded hole in a bracket 42 which is attached to the rear side of the box 22.
  • the rear of the vessel 18 hasl an overfiow edge 44, which is placed at some ⁇ distance from the rear-wall of the box, and which can be raised or lowered by the adjustment effected by the screw 38 so that the level of the liquid bath 16 can be regulated in relation to the throwing roller 14.
  • a means is provided to determine the quantity of liquid which is picked up and thrown by the roller 14 and consequently adjustment of the quantity of liquid supplied to the roller '12 is provided in addition to that provided by the shutter or shutters 26.
  • a fixed tray I46 having au outlet 48 is disposed below the box Z2 below the box Z2 .
  • Wetting liquid is supplied to the box 22 through a pipe 50 ⁇ having a valve 52, so that a surplus of liquid will always be present.
  • the pipe 50 discharges the liquid between two inclined plates 54, which also prevent any foam formed by the rotation of the throwing roller 14 in the box 22 from reaching the overliow edge 44.
  • a damping device for offset printing machines comprising a rotary mounted printing cylinder, a rotary mounted damping roller which transfers the wetting liquid to a printing plate on the printing cylinder, a chamber having -front and rear walls and a longitudinal slot in the front wall facing the damping roller and an inlet at the top to admit the wetting liquid and an outlet in the bottom for discharging surplus liquid, a vessel containing the wetting liquid which is situated at the bottom of said chamber 4and having its rear side spaced from the rear wall of the chamber to pro-vide access to said outlet in the bottom of the chamber, said rear side of the vessel forming an overilow edge to define the amount of wetting liquid in the bath, a roller ⁇ dipping into the liquid in the vessel, and means yfor rotating said roller at such speed that it throws the liquid from the bath tangentially out through the longitudinal slot in the chamber and directly against the damping roller, said chamber being further provided with two inclined plates extending from the roof of the chamber at each side of the inlet for wetting liquid and terminating
  • a damping device comprising a substantially closed chamber having front and rear Walls, a longitudinal slot in the front wall -facing the damping roller, an inlet at the top to admit the wetting liquid and an outlet at the rear part of the bottom for discharging surplus liquid, a vessel to provide a bath for the wetting liquid which is situated at the bottom of said chamber and having its rear side spaced ⁇ from the rear wall of the chamber to provide access to said outlet in the bottom of the chamber, said rear side of the vessel forming an overflow edge to -dene the amount of liquid in the bath, a roller dipping into the liquid in the vessel, means for rotating this roller at such speed that it throws liquid from the bath tangentially out through the longitudinal slot in the chamber and directly against the damping roller which then transfers the liquid to the plate on the printing cylinder, and a tray placed beneath said chamber containing said outlet and adapted to collect any liquid spilled therefrom, said
  • a damping device for oifset printing machines comprising a rotary mounted printing cylinder, a rotary mounted damping roller which transfers wetting liquid to a printing plate on the printing cylinder by contact therewith, a circular cylinder body mounted for rotation and parallel to the damping roller and being partially submerged in a bath of the wetting liquid, said cylinder body being coated circumferentially by a sheet having a plurality of perforations, a vessel containing said bath of wetting liquid, a chamber enclosing said cylinder body and said vessel and having a longitudinal slot facing the damping roller, and means for rotating said cylinder body at such speed that it throws liquid from the bath adhering to the circumferential surface thereof out through said longitudinal slot in the chamber directly against the surface of the damping roller which then transfers the liquid to the plate on the printing cylinder.
  • a damping device for offset printing machines comprising a rotary mounted printing cylinder, a rotary mounted damping roller which transfers wetting liquid to a printing plate on the printing cylinder by contact therewith, an elongated chamber having front and rear walls and a longitudinal slot in the front wall facing the damping roller, a vessel containing the wetting liquid situated near the bottom of said chamber and having its rear side spaced from the rear wall of the chamber to provide an outlet for the wetting liquid in the bottom thereof and forming an overflow edge to control the level of wetting liquid in the bath, a roller having a cylindrical surface dipping into the liquid in the vessel, said chamber on its front portion having at least one bracket enclosing a xed horizontal pivot and on its rear side having a bracket with a threaded hole which receives an adjusting screw having a portion mounted in a fixed bracket, so that by means of this adjusting screw the rear part of the chamber and the vessel attached thereto can be raised or lowered to regulate the level of liquid in relation to the roller surface dipping into the liquid
  • a damping device for offset printing machines comprising a rotary mounted printing cylinder, a rotary mounted damping roller which transfers wetting liquid to a printing plate on the printing cylinder by contact therewith, a circular cylinder body mounted for rotation and parallel to the damping roller and being partially submerged in a bath of the wetting liquid, said cylinder body having a discontinuous surface to enhance the amount of liquid picked up thereby, a vessel containing said bath of wetting liquid, a chamber enclosing said cylinder body and said vessel and having a longitudinal slot facing the damping roller, and means for rotating said cylinder lbody at such speed that it throws liquid from the bath 4adhering to the circumferential surface thereof out through said longitudinal slot in the chamber directly against the surface of the damping roller which then transfers the liquid to the plate on the printing cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
US743556A 1957-07-04 1958-06-23 Damping device for offset printing machines Expired - Lifetime US2995084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK873266X 1957-07-04

Publications (1)

Publication Number Publication Date
US2995084A true US2995084A (en) 1961-08-08

Family

ID=8153450

Family Applications (1)

Application Number Title Priority Date Filing Date
US743556A Expired - Lifetime US2995084A (en) 1957-07-04 1958-06-23 Damping device for offset printing machines

Country Status (8)

Country Link
US (1) US2995084A (de)
BE (1) BE568074A (de)
CA (1) CA641198A (de)
FR (1) FR1198247A (de)
GB (1) GB873266A (de)
IT (1) IT590773A (de)
NL (1) NL104170C (de)
NO (1) NO94923A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093067A (en) * 1961-07-31 1963-06-11 Advanced Graphics Inc Humid air press plate conditioning apparatus for printing press
US3561357A (en) * 1967-04-17 1971-02-09 Baeuerle Gmbh Mathias Water tray arrangement for the dampening unit of an offset printing machine
US3759175A (en) * 1970-03-10 1973-09-18 Strachan & Henshaw Ltd Dampening apparatus with rotor for projecting spray
US3924531A (en) * 1972-11-29 1975-12-09 Maschf Augsburg Nuernberg Ag Spray dampener for rotary press
US3926115A (en) * 1973-02-01 1975-12-16 Strachan & Henshaw Ltd Spray dampening apparatus
US4034670A (en) * 1975-03-24 1977-07-12 Rockwell International Corporation Dampening device for lithographic printing press
EP0525556A1 (de) * 1991-07-27 1993-02-03 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Einrichtung zum Befeuchten von Zylindern bei Offsetrotationsdruckmaschinen
US20080017059A1 (en) * 2006-07-24 2008-01-24 Englram Paul B Printing Press Fountain Supply and Turbo Dampener Cleaning

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2709151A1 (de) * 1977-03-03 1978-09-07 Maschf Augsburg Nuernberg Ag Rotations-flachdruckwerk

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US385054A (en) * 1888-06-26 Electric railway
US2178583A (en) * 1937-07-10 1939-11-07 Roberts & Porter Inc Dampener for printing presses
US2753795A (en) * 1950-04-05 1956-07-10 Ditto Inc Rotary offset duplicating machine
US2853004A (en) * 1955-04-19 1958-09-23 John O Sanker Lithographic press dampening mechanism for spraying desensitizing liquid on lithographic plates
US2868118A (en) * 1954-09-24 1959-01-13 Harold P Dahlgren Lithographic offset press plate dampening device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US385054A (en) * 1888-06-26 Electric railway
US2178583A (en) * 1937-07-10 1939-11-07 Roberts & Porter Inc Dampener for printing presses
US2753795A (en) * 1950-04-05 1956-07-10 Ditto Inc Rotary offset duplicating machine
US2868118A (en) * 1954-09-24 1959-01-13 Harold P Dahlgren Lithographic offset press plate dampening device
US2853004A (en) * 1955-04-19 1958-09-23 John O Sanker Lithographic press dampening mechanism for spraying desensitizing liquid on lithographic plates

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093067A (en) * 1961-07-31 1963-06-11 Advanced Graphics Inc Humid air press plate conditioning apparatus for printing press
US3561357A (en) * 1967-04-17 1971-02-09 Baeuerle Gmbh Mathias Water tray arrangement for the dampening unit of an offset printing machine
US3759175A (en) * 1970-03-10 1973-09-18 Strachan & Henshaw Ltd Dampening apparatus with rotor for projecting spray
US3924531A (en) * 1972-11-29 1975-12-09 Maschf Augsburg Nuernberg Ag Spray dampener for rotary press
US3926115A (en) * 1973-02-01 1975-12-16 Strachan & Henshaw Ltd Spray dampening apparatus
US4034670A (en) * 1975-03-24 1977-07-12 Rockwell International Corporation Dampening device for lithographic printing press
EP0525556A1 (de) * 1991-07-27 1993-02-03 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Einrichtung zum Befeuchten von Zylindern bei Offsetrotationsdruckmaschinen
US5299495A (en) * 1991-07-27 1994-04-05 Koenig & Bauer Aktiengesellschaft Cylinder moistening assembly
US20080017059A1 (en) * 2006-07-24 2008-01-24 Englram Paul B Printing Press Fountain Supply and Turbo Dampener Cleaning

Also Published As

Publication number Publication date
GB873266A (en) 1961-07-19
IT590773A (de)
NO94923A (de)
FR1198247A (fr) 1959-12-04
CA641198A (en) 1962-05-15
BE568074A (de)
NL104170C (de)

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