EP0337800A2 - Feucht- und Farbvorrichtung für Druckmaschinen - Google Patents

Feucht- und Farbvorrichtung für Druckmaschinen Download PDF

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Publication number
EP0337800A2
EP0337800A2 EP89303715A EP89303715A EP0337800A2 EP 0337800 A2 EP0337800 A2 EP 0337800A2 EP 89303715 A EP89303715 A EP 89303715A EP 89303715 A EP89303715 A EP 89303715A EP 0337800 A2 EP0337800 A2 EP 0337800A2
Authority
EP
European Patent Office
Prior art keywords
gear
roll
form roll
axis
printing cylinder
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Withdrawn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
EP89303715A
Other languages
English (en)
French (fr)
Other versions
EP0337800A3 (de
Inventor
Leonard Frederick Popkin
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0337800A2 publication Critical patent/EP0337800A2/de
Publication of EP0337800A3 publication Critical patent/EP0337800A3/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Withdrawn legal-status Critical Current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
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/40—Devices for tripping or lifting damping rollers; Supporting, adjusting, or removing arrangements therefor
    • 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

  • This invention relates to a device for use in the dampening and inking of printing plates in a rotary printing press. While not limited thereto, the pres­ent invention finds particular application in a dampening and inking device to be incorporated into an existing rotary lithographic press as a retro-fit.
  • Rotary lithographic presses are well known in the art, as is the requirement to dampen a printing plate of the press in order to prevent or retard contamination of the resist areas of the printing plate with oil based printing inks used in printing from the plates.
  • Such plates usually have a dot matrix of up to 100% which has been rendered oleophilic and hydrophobic, the remaining areas of the plates being hydrophilic and oleophobic.
  • arsenor markings is one commonly used in the trade, and relates to a smearing of the printing ink applied to the printing plate arising from differences between peripheral speed of the printing cylinder and that of a form roll, and which manifests itself as transverse lines of smearing in the finished print.
  • Such adjustments either can result in the bottoming of the teeth of the associ­ated drive gears and the feeding of noise and vibrations to the form roll, or, in the alternative, can result in free play and chattering in the gear teeth resulting in overspeeding and underspeeding of the form roll. Both of these conditions can result in "scuffing" and "gear marking" in the finished print.
  • the problem addressed by the invention is the provision of an inking/dampening roller system that can reduce the problems of scuffing and of gear marking, preferably to the point of elimination. Also, it is sought to enhance the efficiency of the form roll in its function of applying an even film of water and ink emulsion in a metered flow to the printing plate.
  • the metering roll is driven by an idler gear rotatable about a fixed axis independent of the axis of rotation of the form roll, which in turn is driven by a gear fast with the drive shaft of the printing cylinder, each of the gears being rotatable on an axis parallel to and of fixed dis­tance from each other axis.
  • the form roll is not driven by the intermediate idler gear, but instead is intentionally freely rotatable relative thereto. This results in the isolation of the form roll from any residual gear chatter in the gear transmission and the isolation of the form roll from noise and vibrations produced in the gear train. In this manner, the produc­ tion of gear markings in the finished print is eliminated in its entirety.
  • the form roll is mounted for omni-directional adjust­ment of its axis of rotation relative to the fixed axis of the idler gear and in parallelism with and relative to the axis of rotation of the printing cylinder.
  • the adjustment is independent of the fixed axis of the rotation of the idler gear, and, in parallelism with the axis of the metering roll and its associated driven gear.
  • the nip between the form roll and the metering roller can be accurately adjusted to produce exactly the required extent of metering without in any way affecting an adjustment of the driving gears.
  • the drive of the form roll proceeds on the minor fric­tional engagement of the form roll with the printing cylinder and with the metering roll, as assisted by the frictional hydraulic drag of the water and ink emulsion film passing through the respective nips of the rollers.
  • the frictional drive to the form roll is thus entirely independent of the mechanical drive from the printing cylinder to the metering roll, thus removing the cause of the scuffing between the form roll and the printing plate.
  • the dampening and inking device embodying the invention comprises a pair of spaced frame members 10, only one of which s shown in Figure 1, the frame members 10 being arranged in spaced parallel relation, and secured in any convenient manner against movement relative to each other.
  • the frame members 10 provide end supports, re­spectively, for a printing cylinder 12 adapted to carry a printing plate [not shown], a form roll 14 and a meter­ing roll 16.
  • the metering roll 16 in use of the device, ex­tends into a trough 18 to which a metered quantity of water and printing ink is supplied, as is well known in the art.
  • the metered supply of water and printing ink can be fed to the nip between the form roll 14 and the metering roll 16.
  • the form roll 14 is rotated at a peripheral speed corresponding with the peripheral speed of the printing cylinder 12 and, in turn, the metering roll 16 is rotated at a peripheral speed corresponding with the peripheral speed of the form roll 14.
  • Rotation of the metering roll 16 will cause it to pick up on its surface a film of water and printing ink, which is then carried into the nip between the form roll 14 and the metering roll 16.
  • the pressure between the form roll 14 and the meter­ing roll is then adjusted in order that only a metered quantity of water and printing ink can pass through the nip and remain on the surface of the form roll 14 as a metered film of water and printing ink.
  • an axially oscillating form assist roll 20 is provided in pressure contact with the surface of the form roll 14, the assist roll 20 acting to distribute and emulsify the film of water and printing ink on the surface of the form roll 14 during axial oscillation of the form assist roll 20.
  • Any convenient mechanism can be provided for oscillating the form assist roll 20, such mechanisms being well known in the art.
  • the metered film of water and printing ink in emulsified or partially emulsified form is then carried by the form roll to the nip between the form roll 14 and the printing cylinder 12, at which point the metered film of water and printing ink is deposited on the printing plate carried by the printing cylinder 12.
  • Printing then proceeds from the printing plate carried by the printing cylinder 12 in an entirely usual manner as well known in the art.
  • the shaft on which the form roll 14 and its associated idler gear 14a are mounted is supported for adjustable movement towards or away from the axis of the shaft 12b on which the printing cylinder 12 and its associated drive gear 12a are mounted.
  • the respective gears 12a, 14a and 16a are each mounted on fixed and immovable axes, such that optimum meshing of the teeth of the respective gears is provided without regard to adjust­ments made in the position of the form roll 14 and the metering roll 16.
  • the form roll 14 instead of being mounted for ro­tation about an axis coincident with the axis of the idler gear 14a, is mounted for movement of its longitu­dinal axis in an orbital path 22 relative to the fixed axis 14b of the idler gear 14a.
  • one end of the respective printing cylinder and rolls is shown in as­sociation with one of the frame members 10.
  • the printing cylinder 12 is illustrated as carrying a spur gear 12a which is pinned thereto at 30 for rotation in unison therewith.
  • the spur gear 12a is driven from a main drive of the printing press in any convenient manner, thus causing rotation of the printing cylinder about the fixed shaft 32.
  • the spur gear 12a in turn meshes with the teeth 14a of an idler gear 34 which is journaled for rotation on a fixed bearing 36.
  • the teeth 14a of the idler gear 34 in turn mesh with the teeth 16a of the driven gear of the metering roll 16, which conveniently is pinned at 36 to the metering roll 16 for rotation in unison therewith, the metering roll 16 being journaled for rotation on a fixed shaft 38.
  • the form roll 14 is not mounted for rotation in unison with the idler gear 34. Instead, the form roll 14 is rotatable relative to the idler gear 34, and in addition, the axis of rota­tion of the form roll 14 is displaceable on an orbital path relative to the idler gear 34.
  • each of the gears 12a, 14a, 16a remains journaled about a fixed axis, the respective axes being immovable one relative to the other.
  • FIG. 5 shows the mount­ing of the form roll 14 in enlarged detail
  • the form roll 14 is shown as extending between the opposed end frames 10, 10.
  • the bearing 36 is fixedly held in one of the end frames 10, conveniently by means of a threaded bolt 50 extending through a washer 52, the bolt 50 being threaded into an axial extension 54 of the bear­ing 36.
  • the extension 54 can be cylindrical in cross-­section, or of any other cross-sectional shape, the sole requirement being that the bearing 36 be immovable and that it provide a support for the idler gear 14a.
  • an anti-­friction sleeve 56 which conveniently is a tubular sleeve of brass having a low coefficient of friction.
  • the form roll itself is formed from a relatively hard resilient but compressible rubber or rubber like material, and conveniently can be formed from an elastomer.
  • a shaft 58 Extending within the anti-friction sleeve 56 is a shaft 58 with eccentric portions 60-62 at each of its op­posite ends. While the eccentric 60 and 62 can be of different diameter, the essential condition is that the longitudinal axes of the respective eccentrics be coin­ cident with each other along the central longitudinal axis 64. The longitudinal axis 66 of the shaft 58 is located in staggered relationship relative to the lon­gitudinal axis 64.
  • any convenient means is provided for rotating the shaft 58 about the longitudinal axis 64. As illus­trated, this can be accomplished by means of a turn buckle pinned to the eccentric 62 at 70, and which is rotatable by means of a handle 72.
  • the handle 72 can be manually actuated, or, as will be well understood, it can be actuated under the control of a micrometer screw arrangement diagrammatically indicated at 74.
  • the idler gear 14a could be journaled for rotation directly on the adjacent end frame 10, and the eccentric 60 journaled for rotation directly in the associated end frame 10, this being in accordance with the specific requirement of the present invention that the idler gear 34 be mounted for rotation about a fixed axis, whereas the axis of rotation for the shaft 58 is adjustable on an orbitable path relative to that fixed axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
EP89303715A 1988-04-15 1989-04-14 Feucht- und Farbvorrichtung für Druckmaschinen Withdrawn EP0337800A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US18247488A 1988-04-15 1988-04-15
US182474 1988-04-15

Publications (2)

Publication Number Publication Date
EP0337800A2 true EP0337800A2 (de) 1989-10-18
EP0337800A3 EP0337800A3 (de) 1990-06-27

Family

ID=22668642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89303715A Withdrawn EP0337800A3 (de) 1988-04-15 1989-04-14 Feucht- und Farbvorrichtung für Druckmaschinen

Country Status (2)

Country Link
EP (1) EP0337800A3 (de)
JP (1) JPH0263743A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1284185A3 (de) * 2001-08-06 2003-05-02 Fuji Photo Film Co., Ltd. Farbzuführvorrichtung, Druckmaschine mit einer solchen Vorrichtung und Druckverfahren

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1257592A (fr) * 1960-05-27 1961-03-31 Adamovske Strojirny Np Dispositif de basculement pour cylindres de pression, notamment pour machine à imprimer et machine équipée de ce dispositif ou d'un dispositif similaire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1284185A3 (de) * 2001-08-06 2003-05-02 Fuji Photo Film Co., Ltd. Farbzuführvorrichtung, Druckmaschine mit einer solchen Vorrichtung und Druckverfahren

Also Published As

Publication number Publication date
JPH0263743A (ja) 1990-03-05
EP0337800A3 (de) 1990-06-27

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