EP0305796B1 - Dispositif de mouillage pour machines d'impression en offset - Google Patents

Dispositif de mouillage pour machines d'impression en offset Download PDF

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Publication number
EP0305796B1
EP0305796B1 EP88113209A EP88113209A EP0305796B1 EP 0305796 B1 EP0305796 B1 EP 0305796B1 EP 88113209 A EP88113209 A EP 88113209A EP 88113209 A EP88113209 A EP 88113209A EP 0305796 B1 EP0305796 B1 EP 0305796B1
Authority
EP
European Patent Office
Prior art keywords
feed roller
damping device
wiping element
liquid
periphery
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
EP88113209A
Other languages
German (de)
English (en)
Other versions
EP0305796A2 (fr
EP0305796A3 (en
Inventor
Giancarlo Terzuolo
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.)
GRAPHO ENGINEERING Srl
Original Assignee
GRAPHO ENGINEERING Srl
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 GRAPHO ENGINEERING Srl filed Critical GRAPHO ENGINEERING Srl
Priority to AT88113209T priority Critical patent/ATE89220T1/de
Publication of EP0305796A2 publication Critical patent/EP0305796A2/fr
Publication of EP0305796A3 publication Critical patent/EP0305796A3/de
Application granted granted Critical
Publication of EP0305796B1 publication Critical patent/EP0305796B1/fr
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening
    • 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 invention relates to a dampening unit for offset printing machines according to the preamble of claim 1.
  • one of the prerequisites for an acceptable print quality is the perfect moistening of the non-printing areas of the plate or printing form before they are finally colored.
  • a thin layer of water with additives is applied to the printing form to moisten it.
  • the moisture layer on the printing form must be continuous, but at the same time must not be too thick to prevent the moisture from emulsifying the printing ink used to the correct extent, which would have a significant impact on print quality.
  • water with additives mainly phosphoric acid and gum arabic
  • a trough with a constant liquid level is provided, into which a feed roller is immersed, the surface of which consists of metallic chrome and is sometimes covered with a braid.
  • the rotation of the feed roller is either intermittent with adjustable Strip width or continuously and slowly with adjustable speed in order to be able to adapt the amount of liquid supplied to the working conditions.
  • Spray rolls or systems with bundled compressed air jets can graduate the metering in the transverse direction.
  • a takeover roll which has an elastic coating and is covered with molton or a braid, is freely rotatably supported on two swivel arms at its two ends. This role takes over the moisture strip from the feed roller and transfers it to a parallel distribution roller, the surface of which has a metallic chrome layer and which is driven axially back and forth as well as rotating, whereby the rotary movement takes place via a gear with the same peripheral speed as the plate cylinder.
  • the water transferred to the distributor roller is released by the latter onto two dampening rollers, which have an elastic coating and a coating of molton or fabric. These two dampening rollers are freely rotatable and are carried by friction between the plate cylinder and the distributor roller, the contact pressure being adjustable via adjustable bearings.
  • a serious disadvantage of using coatings or molton coatings is the need to replace them after a certain period of use, since signs of wear and tear during operation and cleaning during maintenance work cannot be avoided. Changing the covers is difficult and requires a lot of start-up time before the machine has returned to equilibrium in operation.
  • a continuously operating dampening system in which the liquid consists mainly of water with the addition of alcohol, thereby reducing the surface tension of the water, so that each spreading drop has a larger surface area of the plate or moistened the matrix so that the right balance between water and color is achieved with a smaller amount of water.
  • the alcohol content in the liquid causes it to evaporate more quickly, which favors the drying of the fresh print.
  • this system is effective only on condition that the liquid is applied evenly as a very thin film without any discontinuity.
  • This layer is partially transferred to the first inking roller, which already has the printing ink and is driven by the printing plate so that it runs at the same peripheral speed as this.
  • the difference in peripheral speeds at the point of contact causes the liquid layer to stretch so that it becomes even thinner.
  • the axis of the metering roller can be mounted so that it does not run completely parallel to the axis of the feed roller, which increases the contact pressure in the central area to compensate for the deflection of the rollers.
  • the subsequent settings are made at intervals after the sheets have been output, for which purpose the rotational speed of the feed roller is changed manually.
  • the layer thicknesses of the liquid applied to the printing plate or die which can be achieved with the system, are not comparable to those which could be produced in the conventional dampening system, in which the tissue coatings retained a certain amount of liquid.
  • a dampening system, from which the invention is based, is known from DE-C 28 49 096.
  • the stripping element consists of doctor sections arranged next to one another, each of which is acted upon by an angle lever, which is actuated manually or automatically by means of an adjusting pin can be adjusted in order to press the assigned doctor blade section more or less strongly against the feed roller.
  • EP-A 90 181 relates to a device for moistening printing plates by means of a feed roller which is sprayed by metering devices which are connected to a computer.
  • the computer processes the measurement results of a measuring device for the dampening solution layer thickness, so that this can be kept at a constant value.
  • the invention has for its object to provide a continuously operating dampening system for offset printing presses, which is able to apply the correct amount of moisture to the printing plate at any time, automatically taking into account the size and the deviations of the parameters that the over-humidification and thus the print quality can influence, and the inevitable mechanical deformations of the individual rollers of the dampening system should remain without effects.
  • the invention is intended to provide a continuously operating dampening system which produces an extremely thin film of liquid which cannot be achieved with known dampening systems.
  • the dampening system should have a control system that processes the extension of the operating conditions of the machine in real time.
  • the dampening system is to produce a uniform surface coating of the printing plate with the same amount of liquid, regardless of the printing speed and the fluctuation of other parameters such as the temperature of the individual machine parts, the relative humidity and the viscosity of the dampening liquid, both in the case where the liquid Water with the usual additives, as well as in the case where it contains water with alcohol added.
  • a plate cylinder 1 of an offset printing machine is shown, which cooperates with a rubber cylinder 2 in a known manner.
  • a trough 3 with a constant liquid level is supplied with liquid for the dampening unit in a known manner.
  • the feed roller 4 has a coating, not shown, of hydrophilic material, which has a microporosity on the surface, which is able to transfer the liquid uniformly.
  • the feed roller 4 touches a dampening roller 7, which has the task of moistening the printing plate, not shown, which is attached to the circumference of the plate cylinder 1; the dampening roller 7 also wets an intermediate roller which is attached below the first inking roller 8 and touches it.
  • a metering element 9 bears along a generatrix of the feed roller 4.
  • This consists of an elongated stripping element of circular cross section made of elastic material, for example a silicone material.
  • the length of the stripping element 9 corresponds to that of the feed roller 4.
  • the stripping element 9 is accommodated in a rectilinear longitudinal groove 10, the depth of which is greater than the diameter of the stripping element 9 and which is incorporated into a fixed supporting beam 11 according to FIG.
  • the longitudinal groove 10 is connected to three diametrically arranged, through bores 12 which are arranged at uniform intervals between the two ends of the beam 11.
  • the central bore 12 lies in the transverse median plane of the feed roller 4, while the two lateral bores 12 are at the same distance from the associated ends of the beam 11.
  • the bores 12 open into a cavity 13 which is formed on the outside of the beam 11 and is separated by a membrane 14 from a cavity 15 which is worked into a cover 16 which is on the beam 11 is attached.
  • a rod 17 is attached, which extends through the bore 12 and the free end of which rests against the central region of a pressure rail 18 which has an elongated course and is accommodated in the longitudinal groove 10 at a short distance from the bottom thereof.
  • the pressure rail 18 partially engages in a recess 19, which is incorporated into the side of a counter pressure rail 20 facing the bottom of the longitudinal groove 10.
  • the pressure rail 18 is supported with its two ends on two shoulders which are formed in the recess 19.
  • the height of the pressure rail 18 and the counter pressure rail 20 and the length of the rod 17 are chosen so that the stripping element 9 always protrudes a little from the longitudinal groove 10.
  • the pressure force with which the stripping element 9 is pressed against the feed roller 4 can be changed in this way.
  • the length of the counter pressure rails 20 is selected so that they exert a compressive force practically over the entire length of the stripping element 9.
  • FIG. 2 shows, there is a sensor 23 for the rotational speed (a so-called coding device) on the axis of the plate cylinder 1, which is capable of feeding the machine signals corresponding to this operating parameter to a computer 24 or microprocessor.
  • a computer 24 or microprocessor.
  • This also receives signals from a read head 25 (or "plate scanner") of the printing plate, which scans strips of the printing plate, not shown and attached to the plate cylinder 1.
  • the computer 24 can also be supplied with signals from measuring elements for the temperature and the air humidity, which may be arranged, for example, in the area of the side walls of the machine opposite one another.
  • An input keyboard 30 is connected to the computer 24, via which additional software can be used to make corrections, which have the purpose of taking into account fixed parameters such as the viscosity of the liquid or the like.
  • the input keyboard 30 can thus be omitted and the computer 24 can be replaced by a simple evaluation circuit without influencing the automatic and continuous control of the liquid layer thickness as a function of the speed of rotation and the structure of the plate cylinder.
  • more groups can be provided instead of the three groups that press the stripping element 9 against the circumference of the feed roller 4. It is also possible to control these groups via a single pressure regulator 21, which in turn can be of any commercially available type.
  • the working units which press the stripping element against the circumference of the feed roller can consist of a plurality of elongated cavities with elastic walls, which are arranged in a row next to one another between the stripping element and the bottom of the longitudinal groove in which the stripping element is accommodated; the cavities can be connected to a line for the supply of pressure medium via pressure regulators.
  • the unit which contains the stripping element and the associated pressure and bearing means can finally have organs for driving the feed roller in the axial direction are driven back and forth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Soil Working Implements (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)

Claims (10)

  1. Dispositif de mouillage pour machine offset comprenant un cylindre mouilleur (4) mû par un moteur indépendant à vitesse réglable, prenant un liquide dans un réservoir pour former un film fin dudit liquide qui s'étend entre une partie de la circonférence du cylindre mouilleur (4) et un élément de raclage (9), lequel est appuyé sur le cylindre mouilleur (4) par une série d'organes de pression réglables, caractérisé par le fait que les organes de pression comprennent des cylindres à pression hydraulique (13 - 16), dont les tiges (17) appuient l'élément de raclage élastique (9) contre la circonférence du cylindre mouilleur (4), à chacun des cylindres (13 - 16) étant associé un régulateur de pression commandé par des impulsions provenant d'un calculateur (24) apte à l'exploitation des paramètres d'opération de la machine offset, et apte à la commande du système de régulation de la vitesse du cylindre mouilleur.
  2. Dispositif de mouillage selon la revendication 1, caractérisé par le fait que le calculateur (24) est relié à des capteurs de température et d'humidité de l'air dans les zones de la machine où se trouvent les cylindres à pression hydraulique (13 - 16) appuyant sur l'élément de raclage (9).
  3. Dispositif de mouillage selon la revendication 1 ou 2, caractérisé par le fait que le calculateur (24) est relié à une série de têtes de lecture (25), chacune analysant la structure d'une bande périphérique de la plaque à imprimer et transmettant les valeurs mesurées au calculateur (24) sous forme d'impulsions électriques, le dit calculateur (24) transmettant aux régulateurs de pression (21) correspondants aux bandes périphériques explorées des impulsions de commande qui déclenchent dans le cylindre hydraulique correspondant (13 - 16) la pression nécessaire pour la formation du film liquide d'épaisseur convenable pour l'humidification optimale de la plaque à imprimer.
  4. Dispositif de mouillage selon l'une quelconque des revendications précédentes, caractérisé par le fait que l'élément de raclage (9) est en un matériau élastomère.
  5. Dispositif de mouillage selon la revendication 4, caractérisé par le fait que l'élément de raclage (9) présente une section circulaire et est logé dans une gorge longitudinale (10), parallèle à l'axe, formée dans une barre rigide (11) qui s'étend de façon sensiblement parallèle au cylindre mouilleur (4) et à faible distance de celui-ci, plongeant dans le bac à liquide.
  6. Dispositif de mouillage selon la revendication 5, caractérisé par le fait que les cylindres à pression hydraulique (13 - 16) dont les tiges (17) appuient contre l'élément de raclage (9), sont montés dans des alésages (12) percés transversalement dans la barre (11) et aboutissant dans la gorge longitudinale (10) à orientation axiale, abritant l'élément de raclage (9).
  7. Dispositif de mouillage selon une quelconque des revendications précédentes, caractérisé par le fait que l'élément de raclage (9) est appuyé contre la circonférence du cylindre mouilleur (4) par des barres à contre-pression (20) qui s'étendent sur toute la longueur de l'élément de raclage (9) et qui sont elles-mêmes poussées par des barres de pression (18) actionnées chacune par un des cylindres à pression hydraulique (13 - 16).
  8. Dispositif de mouillage selon une quelconque des revendications précédentes, caractérisé par le fait que chaque cylindre à pression hydraulique présente une chambre (15) reliée au régulateur de pression correspondant (21) et séparée d'une autre chambre (13) par une membrane (14) à laquelle est fixée la tige du cylindre de pression hydraulique.
  9. Dispositif de mouillage selon une quelconque des revendications précédentes, caractérisé par le fait que le cylindre mouilleur (4) présente à sa surface périphérique une couche d'un matériau hydrophile présentant une surface microporeuse pour la distribution uniforme du liquide.
  10. Dispositif de mouillage selon une quelconque des revendications précédentes, caractérisé par le fait que l'ensemble constitué par l'élement de raclage (9) avec ses cylindres à pression hydraulique et par la barre de support (11) est apte à effectuer un mouvement axial de va et vient engendré par le système de commande du cylindre mouilleur (4).
EP88113209A 1987-08-17 1988-08-16 Dispositif de mouillage pour machines d'impression en offset Expired - Lifetime EP0305796B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88113209T ATE89220T1 (de) 1987-08-17 1988-08-16 Feuchtwerk fuer offset-druckmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6771987 1987-08-17
IT8767719A IT1211266B (it) 1987-08-17 1987-08-17 Sistema di bagnatura continua a regolazione automatica per macchine da stampa offset

Publications (3)

Publication Number Publication Date
EP0305796A2 EP0305796A2 (fr) 1989-03-08
EP0305796A3 EP0305796A3 (en) 1989-03-22
EP0305796B1 true EP0305796B1 (fr) 1993-05-12

Family

ID=11304761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113209A Expired - Lifetime EP0305796B1 (fr) 1987-08-17 1988-08-16 Dispositif de mouillage pour machines d'impression en offset

Country Status (7)

Country Link
US (1) US4892035A (fr)
EP (1) EP0305796B1 (fr)
JP (1) JPH01120341A (fr)
AT (1) ATE89220T1 (fr)
CA (1) CA1294489C (fr)
DE (1) DE3880933D1 (fr)
IT (1) IT1211266B (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038681A (en) * 1988-01-19 1991-08-13 Jimek International Ab Control method and apparatus for spray dampener
JPH0358845A (ja) * 1989-07-28 1991-03-14 Tokyo Kikai Seisakusho Ltd 平版印刷機の湿し水装置
JPH0811439B2 (ja) * 1989-12-20 1996-02-07 テクノロール株式会社 オフセット印刷機ダンプニング装置
DE4000912C1 (fr) * 1990-01-15 1991-05-29 Jagusch & Co, 8649 Wallenfels, De
US5070783A (en) * 1990-05-18 1991-12-10 Ireton Carl A Adjustable doctor blade mounting means
DE4312459C2 (de) * 1992-09-22 1995-04-06 Heidelberger Druckmasch Ag Meßeinrichtung zum Erfassen der Temperatur eines Farbwerks von Druckmaschinen
DE4431646A1 (de) * 1994-09-06 1996-03-07 Koenig & Bauer Albert Ag Dosierwalze an einem Feuchtwerk einer Offsetrotationsdruckmaschine
JP2964229B2 (ja) * 1997-07-11 1999-10-18 株式会社東京機械製作所 湿し水供給装置
AU3362499A (en) * 1998-03-23 1999-10-18 Goss Graphic Systems, Inc. Method and apparatus for controlling a dampener of a lithographic printing press
DE10152466B4 (de) * 2000-11-24 2015-12-17 Heidelberger Druckmaschinen Ag Feuchteregelung unter Berücksichtigung mehrerer den Druckprozess beeinflussender Größen
SE526315C2 (sv) * 2004-05-07 2005-08-23 Baldwin Jimek Ab Ett kontrollsystem och en metod för en tryckpress
US20050252536A1 (en) * 2004-05-14 2005-11-17 Ciliberti Michael N Wiper blade wash station, spray bar and process for cleaning the wiper blade
DE102008049355A1 (de) * 2008-09-29 2010-04-01 Manroland Ag Offsetdruckmaschine
EP2657021A1 (fr) * 2012-04-24 2013-10-30 KBA-NotaSys SA Unité d'entraînement réglable d'une presse à imprimer et presse à imprimer, en particulier presse d'impression en creux la comprenant
ES2773061T3 (es) * 2015-06-03 2020-07-09 I Mer Co Ltd Aparato de agua humectante de para máquinas de impresión y una máquina de impresión equipada con el mismo

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR806676A (fr) * 1935-05-22 1936-12-22 Dresden Leipziger Schnellpress Machine à imprimer en creux
GB1324690A (en) * 1970-10-24 1973-07-25 Champion Paper Co Ltd Printing apparatus
DE2057689B1 (de) * 1970-11-24 1971-12-16 Maschf Augsburg Nuernberg Ag Einrichtung an Rotationsdruckmaschinen zur Steuerung des Anpressdruckes einer Rakel
US3749012A (en) * 1971-10-20 1973-07-31 Addressograph Multigraph Moisture dispensing unit for lithographic fountain system
US3902416A (en) * 1974-12-04 1975-09-02 Dick Co Ab Moisture control for lithographic machines
US4029008A (en) * 1976-05-24 1977-06-14 Addressograph Multigraph Corporation Moisture control system
US4156388A (en) * 1977-08-01 1979-05-29 Am International, Inc. Ink and moisture control system with evaporation compensation
US4140056A (en) * 1977-08-01 1979-02-20 Addressograph-Multigraph Corporation Ink and moisture control system with ink/moisture interface
US4289167A (en) * 1978-10-30 1981-09-15 Ryco Graphic Manufacturing, Inc. Non-drip fluid delivery system
DE2849096C2 (de) * 1978-11-11 1983-12-08 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Feuchtwerk
DE3211157A1 (de) * 1982-03-26 1983-10-06 Roland Man Druckmasch Verfahren und vorrichtung zum befeuchten von druckplatten
DE3331208A1 (de) * 1983-08-30 1985-03-14 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Verfahren zum einstellen des farbwerks einer druckmaschine und messvorrichtung zu seiner durchfuehrung

Also Published As

Publication number Publication date
US4892035A (en) 1990-01-09
IT1211266B (it) 1989-10-12
CA1294489C (fr) 1992-01-21
ATE89220T1 (de) 1993-05-15
EP0305796A2 (fr) 1989-03-08
JPH01120341A (ja) 1989-05-12
EP0305796A3 (en) 1989-03-22
IT8767719A0 (it) 1987-08-17
DE3880933D1 (de) 1993-06-17

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