US3890898A - Directionally reversible rotary offset printing machine and wetting system therefor - Google Patents

Directionally reversible rotary offset printing machine and wetting system therefor Download PDF

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Publication number
US3890898A
US3890898A US427788A US42778873A US3890898A US 3890898 A US3890898 A US 3890898A US 427788 A US427788 A US 427788A US 42778873 A US42778873 A US 42778873A US 3890898 A US3890898 A US 3890898A
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United States
Prior art keywords
cylinder
rubbing
plate cylinder
wetting
rubbing cylinder
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Expired - Lifetime
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US427788A
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English (en)
Inventor
Hermann Fischer
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MAN AG
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MAN Maschinenfabrik Augsburg Nuernberg AG
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    • 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
    • B41F7/36—Inking-rollers serving also to apply ink repellants
    • 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
    • B41F7/26—Damping devices using transfer rollers

Definitions

  • At least two rollers are provided to form part of the wetting system, one being axially shiftable and forming a rubbing cylinder, and having a surface which can be [30] Forelgn Apphcatmn Pnomy Dam wetted by ink, the other roller being in driven engage- Jan. 16, 1973 Germany 2301879 ment with the rubbing cylinder, as we as the plate cylinder, and forming a wetting liquid transfer roller, [52] US. Cl 101/148; lOl/349 the circumferential Speed of the transfar roller being [51] lIlt.C
  • the present invention relates to rotary offset printing machines, and more particularly to such machines in which the direction of rotation is reversible, and to the wetting system therefor.
  • the wetting system is fixed in location within the printing press and has two wetting rollers or cylinders.
  • One of the wetting rollers or cylinders is driven to rotate and additionally to axially reciprocate. Its circumferential surface is made of copper, or a plastic which can accept ink.
  • the other cylinder is a transfer cylinder and is in frictional engagement with the driven rubbing cylinder. It is driven, by this frictional engagement, with a circumferential speed which differs from the circumferential speed of the plate cylinder, with which it is in engagement.
  • the entire surface of the rubbing cylinder will have a uniformly distributed film of ink applied thereon, about which a film of wetting substance, typically water, is applied which will have uniform thickness and which is transferred by the transfer roller or cylinder, in accurately determined quantity by the engagement between the rubbing cylinder and the transfer roller, on the plate cylinder.
  • the film of ink which occurs within the wetting system increases friction between the rubbing cylinder and the transfer roller, and thus slip between these two cylindrical elements is avoided.
  • the speed at which the transfer roller is driven by the rubbing cylinder permits application of wetting substance to the plate cylinder even after inking thereof.
  • FIGS. 1 and 2 illustrate, in highly schematic form, the cylinder arrangements of a reversible rotary offset printing machine, FIG. 1 illustrating rotation of the rubber cylinders for downward feed of web material to be printed, and FIG. 2 illustrating the reverse direction of rotation, for upward feed of material to be printed.
  • plate cylinder 1 is in contact with a rubber cylinder 2, the other rubber cylinder 2' being a counter-cylinder which may, or may not have an additional printing system in contact therewith for double-sided simultaneous printing.
  • a paper web 20 is carried between the nip of the rubber cylinders 2, 2'.
  • the ink application rollers 3, 4 directly engage the plate cylinder 1.
  • Ink application rubbing cylinders 5, 7, 9 and intermediate rollers 6, 8, 10 directly, and indirectly, respectively, apply ink to the ink application rollers 3, 4.
  • the intermediate rollers 10 and 8 are engaged, in dependence on the direction of rotation of the printing press, with the ink rubbing cylinder 9, for example by lateral shifting of rollers 10, and 8, respectively; upon such lateral shift, engagement of the intermediate rollers 6 and 8 (FIG. 1) will likewise be broken (compare FIGS. 1 and 2).
  • the ink transfer cylinder 9 is directly, or indirectly contacted by a transfer roller 1 1, a lifting roller 12, an ink adduction roller 13 and an immersion roller 14.
  • the ink is eventually applied to the plate cylinder 1 through theremaining rollers 7, 5, 4, 3.
  • the wetting system In the direction of rotation indicated in FIG. 1 the wetting system is located in advance of ink application with respect to direction of rotation; when the direction of rotation of FIG. 2 is selected, the wetting system is located behind the ink train, with respect to the direction of rotation of the plate cylinder 1.
  • the wetting system has a transfer roller 16 with a rubber surface which is in contact with an axially movable rubbing cylinder 17. Axial shift of the rubbing cylinder is schematically indicated by arrow A.
  • the rubbing cylinder 17 has a circumference which is made of copper, or a plastic material which can accept ink, or be coated by ink.
  • a wetting fountain system 19 applies an essentially uniform liquid film on the rubbing cylinder 17. This liquid film is measured, or split by the nip between the rubbing cylinder 17 and the rubberized transfer roller 16. Accurate, fine measurement of application of a liquid film is thus effected, for further transfer to the plate cylinder 1. Any other system of applying an essentially uniform film of wetting water, or similar liquid, to the rubbing cylinder 17 may be used.
  • the film of ink on the rubbing cylinder 17, and on roller 16 increases friction within the wetting system, so that roller 16 and rubbing cylinder 17 will have but little relative slip between each other.
  • the rubbing cylinder 17, which reciprocates, is of larger diameter than the transfer roller 16. It is driven by means of a drive system, schematically shown at 18, driven by a motor M which is a variable speed motor, as schematically indicated by the arrow. Other variable speed drives may, of course, be used to permit variation of the speed of the rubbing cylinder 17.
  • the transfer roller 16 is driven by frictional engagement with the driven rubbing cylinder 17. Transfer roller 16, in dependence on the speed of the rubbing cylinder 17, will have a speed which may be larger, or less than that of the plate cylinder 1.
  • the rubbing cylinder 17 will have a greater speed than the plate cylinder 1, so that any loss in circumferential speed of the transfer roller 16, due to the unavoidable surface deformation occurring in the nip between the rubbing cylinder 17 and the transfer roller 16, is compensated.
  • the higher circumferential speed of the transfer roller 16 with respect to the plate cylinder 1 provides for cleaning of the plate cylinder 1 by the transfer roller 16, thus avoiding streaks, or toning of the surface of the plate cylinder.
  • effective use of the wetting system is ensured, particularly if the direction of rotation is as in FIG. 2, that is, with wetting after ink application.
  • the wetting system in accordance with the present invention can be used with all types of rotary offset printing machines; it requires but little space within the printing machine particularly the space immediately adjacent the plate cylinder 1, which is necessary for accessibility for maintenance and cleaning and replacement is only little obstructed by the wetting system itself; changing the production runs of the printing press is thus facilitated.
  • Directionally reversible rotary offset printing machine comprising a plate cylinder operable in either direction of rotation when printing;
  • inking means (3-15) having a fixed location with respect to the plate cylinder (1) and applying ink to the plate cylinder;
  • a wetting system 16-19 having a fixed location with respect to the plate cylinder (1), separate from the inking means, so that the relative position of the wetting system and of the inking means, with respect to the surface of the plate cylinder reverses upon reversal of the direction of rotation of the plate cylinder (1);
  • the wetting system comprises at least two rollers, one of the rollers (17) being axially shiftable and forming a rubbing cylinder and having a surface capable of being coated by ink,
  • the other roller (16) forming a wetting liquid transfer roller having a rubberized surface and being lo-,
  • Machine according to claim 1 wherein the surface of the rubbing cylinder (17) comprises a plastic material being capable of being coated by'printing ink.
  • Machine according to claim 5 wherein the speed of the rubbing cylinder (17) is set to provide a circumferential speed of the transfer roller (16), as driven by frictional engagement with the rubbing cylinder (17), which is less than the circumferential speed of the plate cylinder (1 7.
  • the speed I of the rubbing cylinder (17) is set to provide a circum-

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
US427788A 1973-01-16 1973-12-26 Directionally reversible rotary offset printing machine and wetting system therefor Expired - Lifetime US3890898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2301879A DE2301879A1 (de) 1973-01-16 1973-01-16 Feuchtwerk fuer eine umsteuerbare rotations-offsetdruckmaschine

Publications (1)

Publication Number Publication Date
US3890898A true US3890898A (en) 1975-06-24

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US427788A Expired - Lifetime US3890898A (en) 1973-01-16 1973-12-26 Directionally reversible rotary offset printing machine and wetting system therefor

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US (1) US3890898A (fr)
DE (1) DE2301879A1 (fr)
FR (1) FR2213851B3 (fr)
IT (1) IT1008649B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010686A (en) * 1975-04-07 1977-03-08 Timsons Limited Means for applying liquid to a relatively moving surface
DE3228496A1 (de) * 1981-11-30 1983-06-09 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig Kombiniertes feuchtwerk
US4397235A (en) * 1981-04-25 1983-08-09 Man-Roland Druckmaschinen Aktiengesellschaft Multi-printing mode rotary printing machine
US4558642A (en) * 1983-10-11 1985-12-17 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Damper for a rotary printing machine
US4803872A (en) * 1983-10-17 1989-02-14 Westvaco Corporation Paper printability tester
US4972771A (en) * 1986-07-12 1990-11-27 Miller-Johannisberg Druckmaschinen Gmbh Film dampener unit for offset printing presses
US5107762A (en) * 1988-06-16 1992-04-28 Rockwell International Corporation Inked dampener for lithographic printing
WO1994019190A1 (fr) * 1993-02-22 1994-09-01 Keller James J Systeme mouilleur a reception d'encre pour presse d'impression lithographique
US5865116A (en) * 1993-02-22 1999-02-02 Keller; James J. Ink receptive dampening system for lithographic printing press

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59212268A (ja) * 1983-05-11 1984-12-01 ボ−ルドウイン・テクノロジイ・コ−ポレイシヨン 平版印刷機における給湿装置及び方法
DE3526236A1 (de) * 1985-07-23 1987-01-29 Goebel Gmbh Maschf Feuchtwerk
DE3813829A1 (de) * 1987-06-25 1989-01-05 Heidelberger Druckmasch Ag Feuchtwerk fuer eine offsetdruckmaschine
DE68915340T2 (de) * 1988-06-16 1994-08-25 Rockwell International Corp Eingefärbte Feuchtwalze für Steindruck.
DE8908597U1 (de) * 1989-07-14 1989-08-31 MAN Roland Druckmaschinen AG, 6050 Offenbach Walzenpaar für das Feuchtwerk einer Offestdruckmaschnine

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586480A (en) * 1947-10-17 1952-02-19 Ras Max Water atomizer for damping the cylinders in offset printing machines
US2960929A (en) * 1959-06-15 1960-11-22 Leonard G Erzinger Dampening apparatus for offset process printing presses
US3094065A (en) * 1959-04-06 1963-06-18 Harris Intertype Corp Dampening mechanism for lithographic printing press
US3467008A (en) * 1967-01-31 1969-09-16 Julius A Domotor Means and method for removing foreign particles from lithographic press
US3504626A (en) * 1965-04-13 1970-04-07 Emory W Worthington Printing press dampening control system
US3508489A (en) * 1969-05-15 1970-04-28 Harris Intertype Corp Fluid applying mechanism
US3516354A (en) * 1966-01-02 1970-06-23 Winkler Fallert & Co Ltd Displaceable ink and dampener rolls for reversible printing unit
US3594255A (en) * 1968-10-16 1971-07-20 William D Budinger Hickey roller and method
US3688694A (en) * 1969-08-09 1972-09-05 Roland Offsetmaschf Dampening device for a printing press
US3759175A (en) * 1970-03-10 1973-09-18 Strachan & Henshaw Ltd Dampening apparatus with rotor for projecting spray

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586480A (en) * 1947-10-17 1952-02-19 Ras Max Water atomizer for damping the cylinders in offset printing machines
US3094065A (en) * 1959-04-06 1963-06-18 Harris Intertype Corp Dampening mechanism for lithographic printing press
US2960929A (en) * 1959-06-15 1960-11-22 Leonard G Erzinger Dampening apparatus for offset process printing presses
US3504626A (en) * 1965-04-13 1970-04-07 Emory W Worthington Printing press dampening control system
US3516354A (en) * 1966-01-02 1970-06-23 Winkler Fallert & Co Ltd Displaceable ink and dampener rolls for reversible printing unit
US3467008A (en) * 1967-01-31 1969-09-16 Julius A Domotor Means and method for removing foreign particles from lithographic press
US3594255A (en) * 1968-10-16 1971-07-20 William D Budinger Hickey roller and method
US3508489A (en) * 1969-05-15 1970-04-28 Harris Intertype Corp Fluid applying mechanism
US3688694A (en) * 1969-08-09 1972-09-05 Roland Offsetmaschf Dampening device for a printing press
US3759175A (en) * 1970-03-10 1973-09-18 Strachan & Henshaw Ltd Dampening apparatus with rotor for projecting spray

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010686A (en) * 1975-04-07 1977-03-08 Timsons Limited Means for applying liquid to a relatively moving surface
US4397235A (en) * 1981-04-25 1983-08-09 Man-Roland Druckmaschinen Aktiengesellschaft Multi-printing mode rotary printing machine
DE3228496A1 (de) * 1981-11-30 1983-06-09 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig Kombiniertes feuchtwerk
US4470347A (en) * 1981-11-30 1984-09-11 Veb Kombinat Polygraph "Werner Lamberz" Leipzig Combined wetting agent-distributing system for a printing machine
US4558642A (en) * 1983-10-11 1985-12-17 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Damper for a rotary printing machine
US4803872A (en) * 1983-10-17 1989-02-14 Westvaco Corporation Paper printability tester
US4972771A (en) * 1986-07-12 1990-11-27 Miller-Johannisberg Druckmaschinen Gmbh Film dampener unit for offset printing presses
US5107762A (en) * 1988-06-16 1992-04-28 Rockwell International Corporation Inked dampener for lithographic printing
WO1994019190A1 (fr) * 1993-02-22 1994-09-01 Keller James J Systeme mouilleur a reception d'encre pour presse d'impression lithographique
US5540145A (en) * 1993-02-22 1996-07-30 Keller; James J. Ink receptive dampening system for lithographic printing press
US5865116A (en) * 1993-02-22 1999-02-02 Keller; James J. Ink receptive dampening system for lithographic printing press

Also Published As

Publication number Publication date
FR2213851B3 (fr) 1976-11-05
DE2301879A1 (de) 1974-07-18
IT1008649B (it) 1976-11-30
FR2213851A1 (fr) 1974-08-09

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