US3556005A - Dampening device for a rotary printing press - Google Patents

Dampening device for a rotary printing press Download PDF

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Publication number
US3556005A
US3556005A US714272A US3556005DA US3556005A US 3556005 A US3556005 A US 3556005A US 714272 A US714272 A US 714272A US 3556005D A US3556005D A US 3556005DA US 3556005 A US3556005 A US 3556005A
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US
United States
Prior art keywords
roller
dampening
collars
plate cylinder
ink
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.)
Expired - Lifetime
Application number
US714272A
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English (en)
Inventor
Werner Koch
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.)
Roland Offsetmaschinenfabrik Faber and Schleicher AG
Original Assignee
Roland Offsetmaschinenfabrik Faber and Schleicher AG
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 Roland Offsetmaschinenfabrik Faber and Schleicher AG filed Critical Roland Offsetmaschinenfabrik Faber and Schleicher AG
Application granted granted Critical
Publication of US3556005A publication Critical patent/US3556005A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41F7/26—Damping devices using transfer rollers

Definitions

  • the dampening roller is frictionally driven by a coacting roller and engaged by this roller only at peripheral areas which are not in contact with ink-coated printing surfaces on the plate cylinder.
  • Said peripheral areas are in the form of two circumferential collars or ribs at opposite ends of the ink-coated area of the plate cylinder.
  • the invention relates to, a dampener for a rotary printing press, especially an offset rotary printing press, and more particularly to a dampener which includes at least one dampening roller in contact with the plate cylinder of the press, and moisture being transferred to the dampening roller by a coacting roller driven at substantially the same circumferential speed as the plate cylinder.
  • the dampening roller is usually driven by a friction drive which is derived via engaging peripheral surfaces of the plate cylinder and the dampening roller or via engaging peripheral surfaces of the dampener roller and a driving roller.
  • the driving force applied to the dampener roller depends on the contact pressure between the dampener roller and the plate cylinder or between the dampener .roller and the driving roller. It also depends on the surface conditions on the plate cylinder, the drive roller, the dampener roller, and on the properties of moisture and ink on the printing plate secured to the plate cylinder.
  • a hard cylindrical bearer is provided adjacent, each end of the plate cylinder and is rotative with the cylinder on a common axis.
  • the mechanism also comprises a cylindrical truck adjacent each end of thedampening roller and rotative with the dampeningroller' on a common axis.
  • the trucks have a relatively hard elastic contact surface in frictional rolling engagement with the respective bearers.
  • the sum of the diameters of the plate cylinder and the roller slightly exceeds the sum of the diameters of each bearer and its associated truck, whereby the roller contacts theplate cylinder before thetrucks contact the bearers during advancement of the roller toward the plate cylinder.
  • the contact pressure between thedampening roller and the plate cylinder iscontrolled by the pressure between the trucks and the respective bearers.
  • a more-specific object of the invention is to provide a novel and improved dampening device of the general kind abovereferred-to in which the dampening roller is driven by a friction drive, the efficiency of which is independent of the specific properties ofthe printing plate, the diameter of the plate cylinder, the material used as sleeve for the dampening 2 less coated with ink.
  • Sleeves for dampening rollers are generally made of fabric or rubber, and as is evident, the friction coefficient at the sleeves of dampening rollers is bound to "be markedly different for fabrics than it is for rubber.
  • the frictional driving force is applied only at peripheral surfaces which are not covered with ink due to con tact with the inked printing plate on the plate cylinder. Accordingly, the effective friction coefficient between the dampening roller and the driving roller remains constant. Hence, if the thickness of the printing plate on the plate cylinder or the thickness of the packing changes, no changes in the radial dimensions of the ribs or collars at the ends of the dampening rollers need to be made.
  • the driving roller is preferably a roller which is mounted for axial reciprocation, the stroke of the axial displacement of the roller being preferably such that the driving roller remains in contact with both ribs or collars in its axial limit positions. Such contact with both ribs or collars assures a uniform and reliable drive of the dampening roller.
  • FIG. 1 is a diagrammatic view, partly in section, of a dampening device according to the invention, the dampening roller being shown in contact with the plate cylinder and the driving roller being shown in its middle position;
  • FIG. 2 is a view similar to FIG. 1, thedriving roller being shown in its right-hand end position;
  • a plate 3 is arranged upon a plate cylinder 1 and secured thereto in a conventional manner.
  • a packing 2 is interposed between the printing plate and the peripheral surface of cylinder 1, also in a conventional manner.
  • the total radial thickness of packing 2 and plate 3 will vary as it depends upon the specific requirements of the'printing operation to be carried out.
  • the total thickness of components 2 and 3 can be measured in a conventional manner by means of the accurately machined bearers at the ends of the plate cylinder.
  • a peripheral groove 15 is provided between each bearer 4 and the adjacent ends of packing 2 and plate 3 for a purpose which will be more fully explained hereinafter.
  • the exemplified dampening device comprises a dampening roller 5.
  • the roller as shown has a rigid core 6 such as a metal core about which is wrapped and suitably secured a sleeve 7 such as a rubber sleeve.
  • the sleeve is formed at both ends with radially protruding circumferential ribs or collars 8 and 9.
  • the ribs are shown as being formed out of the material of the sleeve, but the ribs can also be secured to the sleeve or be formed directly on core 6 or secured thereto.
  • the axial spacing between the ribs or collars 8 and 9 is such that when the dampening roller 5, is in contact with the plate cylinder 1, the collars 8 are placed outside the area of the printing plate, and the central area-that is, the effective peripheral surface of roller 5-is in contact with the printing plate 3.
  • collars 8 and 9 are disposed in radial registry with grooves 15. The diameter and width of the collars are such that the same do not engage at any time the peripheral surface of printing plate 3.
  • Driving roller 10 should be visualized as being supplied with moisture by any suitable and conventional means (not shown) and transfers such moisture to the dampening roller.
  • the moisture may be pure water or water to which a suitable additives such as alcohol are added.
  • the distance between the axis of driving roller 10 and driven dampening roller 5 is such that the frictional engagement between ribs or collars 8 and 9 and the circumferential surface of roller 10 is sufficient to drive roller 5 and to transfer moisture.
  • Driving roller 10 is preferably positively coupled with plate cylinder 1 by a transmission means (not shown) such that any increase or decrease in the r.p.m. of the plate cylinder 1 causes simultaneously a corresponding increase or decrease in the r.p.m. of driving roller 10, and thus also of dampening roller 5.
  • Transmission means suitable for the purpose are generally known and do not constitute part of the invention.
  • the driving roller 10 is preferably mounted for axial reciprocation. Accordingly, the roller is subjected, in addition to a rotational movement, to the axial periodic movements indicated in the three FIGS. which show the driving roller in its two limit positions. and also in its middle position.
  • Driving means for applying a combined axial and rotational movement to a roller or cylinder are, of course, widely known and do not constitute part of the invention.
  • the stroke length of roller 10 is such that in either limit position the roller remains in driving engagement with at least one of the ribs or collars 8, 9 but preferably both ribs or collars, as is showri in FIGS. 2 and 3 by indicating the half stroke 11 of the roller 10.
  • a dampening device for a rotary printing press including a rotary plate cylinder, said device comprising in combination:
  • a rotary plate cylinder having thereon an axially elongate peripheral ink-coated area a peripheral groove adjacent to each end of the ink-coated area thereon;
  • a dampening roller having a central peripheral moisture carrying area the axial length of which is substantially coextensive with said ink coated area. said roller being rotatable parallel to the plate cylinder and positioned relative to said cylinder so that the moisture carrying area and the ink coating area are in substantial registry and in peripheral contact with each other;
  • a driving roller rotatable parallel to the dampening roller and in rotation transmitting frictional engagement with at least one of said collars.
  • a dampening device according to claim 1 wherein said driving roller is mounted for axial reciprocation with reference to said dampening roller, the length of the driving roller being such that the roller is in rotation transmitting frictional engagement with one of said collars in any position of axial displacement with reference to the dampening roller.
  • a dampening device according to claim 2 wherein the length of the driving roller is such that the roller is in rotation transmitting frictional engagement with both collars in any position of axial displacement with reference to the dampening roller.
  • dampening roller comprises a rigid core and a sleeve of comparatively elastic material encompassing said core, said collars being at the end of the sleeve.
  • a dampening device according to claim 5 wherein said collars are made in one piece with the sleeve material.
  • a dampening device according to claim 6 wherein said sleeve and the collars thereon are made of rubber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
US714272A 1967-04-15 1968-03-19 Dampening device for a rotary printing press Expired - Lifetime US3556005A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER0045776 1967-04-15

Publications (1)

Publication Number Publication Date
US3556005A true US3556005A (en) 1971-01-19

Family

ID=7407761

Family Applications (1)

Application Number Title Priority Date Filing Date
US714272A Expired - Lifetime US3556005A (en) 1967-04-15 1968-03-19 Dampening device for a rotary printing press

Country Status (3)

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US (1) US3556005A (de)
DE (1) DE1561045A1 (de)
GB (1) GB1208327A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831928A (en) * 1986-11-13 1989-05-23 Herbert Rebel Mounting for changing applicator rolls of printing presses
US5411462A (en) * 1993-08-30 1995-05-02 Link; Terry G. Lightweight ink transfer roll
US5722924A (en) * 1996-04-23 1998-03-03 Eastman Kodak Company Roller for conveying web in a resin coating environment
US6305098B1 (en) * 2001-01-29 2001-10-23 Officine Meccaniche Giovanni Cerutti S.P.A. Rotary printing press drying assembly roller

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5211595B2 (de) * 1972-09-29 1977-03-31

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2207460A (en) * 1938-03-24 1940-07-09 Hotchkiss William Roy Printing press
US2331980A (en) * 1940-07-30 1943-10-19 Du Pont Finish applicator
US2631643A (en) * 1948-06-07 1953-03-17 Schueler Engineering Co Apparatus and process of producing decorative floor covering
US2787210A (en) * 1953-01-22 1957-04-02 Jr Francis H Shepard Hammer impelling means in high speed printers
US2991753A (en) * 1958-07-11 1961-07-11 American Mach & Foundry Adhesive applying apparatus
US3007403A (en) * 1960-08-24 1961-11-07 Joseph T Barnes Printing press attachment
US3177337A (en) * 1962-08-15 1965-04-06 Western Electric Co Electrical discharge machining of printed circuit boards
US3196788A (en) * 1962-03-19 1965-07-27 Michle Goss Dexter Inc Bearer ring desing for four cooperating cylinders
US3259062A (en) * 1964-11-30 1966-07-05 Harold P Dahlgren Process for applying a water-soluble organic dampening fluid
US3296964A (en) * 1964-04-09 1967-01-10 Roberts & Porter Inc Dampening roller mechanism for offset printing presses
US3455238A (en) * 1965-10-22 1969-07-15 Web Offset Publications Corp Water dampening system with soft driven wheels and hard drive wheels

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2207460A (en) * 1938-03-24 1940-07-09 Hotchkiss William Roy Printing press
US2331980A (en) * 1940-07-30 1943-10-19 Du Pont Finish applicator
US2631643A (en) * 1948-06-07 1953-03-17 Schueler Engineering Co Apparatus and process of producing decorative floor covering
US2787210A (en) * 1953-01-22 1957-04-02 Jr Francis H Shepard Hammer impelling means in high speed printers
US2991753A (en) * 1958-07-11 1961-07-11 American Mach & Foundry Adhesive applying apparatus
US3007403A (en) * 1960-08-24 1961-11-07 Joseph T Barnes Printing press attachment
US3196788A (en) * 1962-03-19 1965-07-27 Michle Goss Dexter Inc Bearer ring desing for four cooperating cylinders
US3177337A (en) * 1962-08-15 1965-04-06 Western Electric Co Electrical discharge machining of printed circuit boards
US3296964A (en) * 1964-04-09 1967-01-10 Roberts & Porter Inc Dampening roller mechanism for offset printing presses
US3259062A (en) * 1964-11-30 1966-07-05 Harold P Dahlgren Process for applying a water-soluble organic dampening fluid
US3455238A (en) * 1965-10-22 1969-07-15 Web Offset Publications Corp Water dampening system with soft driven wheels and hard drive wheels

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831928A (en) * 1986-11-13 1989-05-23 Herbert Rebel Mounting for changing applicator rolls of printing presses
US5411462A (en) * 1993-08-30 1995-05-02 Link; Terry G. Lightweight ink transfer roll
US5548897A (en) * 1993-08-30 1996-08-27 Link; Terry G. Method of fabricating lightweight ink transfer roll
US5722924A (en) * 1996-04-23 1998-03-03 Eastman Kodak Company Roller for conveying web in a resin coating environment
US6305098B1 (en) * 2001-01-29 2001-10-23 Officine Meccaniche Giovanni Cerutti S.P.A. Rotary printing press drying assembly roller

Also Published As

Publication number Publication date
DE1561045A1 (de) 1970-02-12
GB1208327A (en) 1970-10-14

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