EP0068546A1 - Wetting device for printing elements in printing machines - Google Patents

Wetting device for printing elements in printing machines Download PDF

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Publication number
EP0068546A1
EP0068546A1 EP82200706A EP82200706A EP0068546A1 EP 0068546 A1 EP0068546 A1 EP 0068546A1 EP 82200706 A EP82200706 A EP 82200706A EP 82200706 A EP82200706 A EP 82200706A EP 0068546 A1 EP0068546 A1 EP 0068546A1
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EP
European Patent Office
Prior art keywords
printing
roller
dampening
moistening
pressure vessel
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.)
Granted
Application number
EP82200706A
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German (de)
French (fr)
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EP0068546B1 (en
Inventor
Joachim Apitz
Werner Falkner
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.)
Kombinat Polygraph Werner Lamberz VEB
Polygraph Leipzig Kombinat Veb
Original Assignee
Kombinat Polygraph Werner Lamberz VEB
Polygraph Leipzig Kombinat Veb
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.)
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Publication date
Application filed by Kombinat Polygraph Werner Lamberz VEB, Polygraph Leipzig Kombinat Veb filed Critical Kombinat Polygraph Werner Lamberz VEB
Publication of EP0068546A1 publication Critical patent/EP0068546A1/en
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Publication of EP0068546B1 publication Critical patent/EP0068546B1/en
Expired legal-status Critical Current

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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
    • B41F7/38—Absorbent pads
    • 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

Definitions

  • the invention relates to a device for moistening printing elements on printing machines, in particular for metering the dampening solution on printing plates in offset printing machines.
  • AT Patent 181,602 discloses a dampening unit for offset printing presses, which is provided with at least one roller intended to release moisture to a plate cylinder.
  • the dampening solution is applied to the distributor roller by means of a single water metering tube connected to a stationary water reservoir via a movable hose, the opening of which faces a distributor roller assigned to two application rollers and which is movably arranged by rollers on the rails which are assigned to the roller in parallel.
  • the water metering tube which forms a slide together with rollers, is moved back and forth uniformly on the rails when the offset printing machine is started up.
  • the water flows from the water reservoir to the distributor roller, which is intended to achieve an even delivery of water to the circumference of the roller.
  • the amount of water to be applied is regulated by metering the water pressure by adjusting the height of the water reservoir.
  • the aim of the invention is to develop a device for moistening printing plate cylinders in offset printing presses, with which the balance of dampening solution and ink required for quality printing can be ensured over the entire length of the printing cylinder.
  • the invention has for its object to provide a moistening device for printing plate cylinders of this type, with which the dampening solution is applied continuously or differentially zonally according to the zonal ink metering, either over the length of the printing cylinder.
  • the object is achieved in that over the length and the diameter of a dampening roller assigned to the printing plate cylinder, the dampening roller and the dampening roller a dampening solution-receiving pressure vessel is arranged, the part of the jacket facing the dampening roller having a capillary-porous structure in which one next to the other electrical resistors are embedded, which can be connected to voltage individually or in groups by means of an electronic control circuit. It is advantageous to adapt the surface of the capillary-porous jacket part to the curvature of the damp duct and to arrange the pressure vessel in a height-adjustable manner. A pressure regulator should be connected upstream of the pressure vessel.
  • this humidifier it is due an adjustable and controllable constant pressure of the dampening solution in the pressure vessel and, due to the structure according to the invention, of the jacket part of the pressure vessel covering the dampening roller, it is possible to continuously form a homogeneous dampening solution film over the entire dampening roller and thus also over the pressure plate cylinder.
  • the resistances applied individually or in groups to voltage of different sizes it is also achieved that the equilibrium ratio of moisture and color can also be maintained zonally, that is to say in very narrow areas, in accordance with the amount of ink supplied to the printing plate cylinder, since the different temperatures adhere to one another the resistances change the size of the capillary and a different dampening solution passage is achieved at constant pressure conditions.
  • the zonal dampening dosage by default and remote control with respect to the zonal inking more Setting - sam will be.
  • the height and width of a dampening roller 4 which is functionally assigned to the printing plate cylinder 1, the dampening roller 2 and the dampening roller 3 are arranged so as to be height-adjustable, the part of the jacket 7 which faces the dampening roller 4 and has a capillary-porous structure.
  • the surface of which is adapted for the purpose of direct contact with the curvature of the damp duct there are electrical ones next to one another Resistors 8 stored, which can be connected individually or in groups to voltage by the electronic control circuit 9.
  • the pressure vessel 6 is preceded by a pressure regulator 10 for the purpose of setting and maintaining the pressure with which the dampening solution 5 is intended to penetrate the capillary-porous layer of the jacket 7.
  • the dampening solution 5 is conveyed by the pump 11 into the pressure container 6, where the dampening solution pressure set on the pressure regulator 10 builds up.
  • the dampening solution 5 is thus pressed through the capillary-porous part of the pressure vessel jacket and transferred via the dampening roller 4, the dampening roller 3 and the dampening application roller 2 to the printing plate cylinder 1 as a homogeneous moisture film.
  • the dampening solution pressure is kept in the set size by the pressure regulator 10.
  • the ink is applied zonally in different amounts to the printing plate cylinder 1, it is possible to also zonally create the different equilibrium ratios of dampening solution and ink by applying the resistors 8 individually or in groups to voltages of different sizes.
  • the heat changes the size of the capillary and thus its dampening solution passage.
  • the dampening solution pressure and the permeability of the capillary-porous part of the pressure vessel shell are two important and controllable variable quantities for achieving a homogeneous dampening solution application on the printing plate cylinder 1 that is continuous or zonally differentiated over the length of the dampening roller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)

Abstract

1. Device for moistening printing elements in printing-machines, particularly for dosing the moistening agent on printing-plates in offset printing-machines, in which device there is disposed over the length and the diameter of a moisture pick-up roller (4) associated with the printing-plate cylinder (1), the moistening roller (2) and the moisture pressure roller (3), a pressure vessel (6) receiving the moistening agent (5), the portion of the casing (7) of which vessel facing the moisture pick-up roller has a capillary-porous structure, characterized in that, in this structure, there are embedded side by side electrical resistors (8) to which a voltage can be applied individually or in groups by means of an electronic control circuit (9) so that the size of the capillaries and thus their moistening-agent transmission is modified by the heat generated.

Description

Die Erfindung betrifft eine Vorrichtung zum Befeuchten von Druckelementen an Druckmaschinen, insbesondere zur Dosierung des Feuchtmittels auf Druckplatten in Offsetdruckmaschinen.The invention relates to a device for moistening printing elements on printing machines, in particular for metering the dampening solution on printing plates in offset printing machines.

Mit der AT-Patentschrift 181.602 ist ein Feuchtwerk für Offsetdruckmaschinen bekannt geworden, das mit mindestens einer zur Feuchtigkeitsabgabe an einen Plattenzylinder bestimmten Walze versehen ist. Durch ein einzelnes über einen beweglichen Schlauch mit einem stationären Wasserreservoir verbundenes Wasserdosierrohr, das einer zwei Auftragswalzen zugeordneten Verreiberwalze mit seiner Öffnung zugewandt und das durch Laufrollen auf den der Walze parallel zugeordneten Schienen bewegbar angeordnet ist, wird das Feuchtmittel auf die Verreiberwalze aufgetragen. Das Wasserdosierrohr, das zusammen mit Laufrollen einen Schlitten bildet, wird bei Inbetriebnahme der Offsetdruckmaschine auf den Schienen gleichförmig hin- und herbewegt. Dabei fließt das Wasser aus dem Wasserreservoir auf die Verreiberwalze, wodurch eine gleichmäßige Abgabe von Wasser auf den Walzenumfang erreicht werden soll. Die Regulierung der aufzutragenden Wassermenge wird durch die Dosierung des Wasserdruckes vorgenommen, indem das Wasserreservoir in seiner Höhe verstellt wird.AT Patent 181,602 discloses a dampening unit for offset printing presses, which is provided with at least one roller intended to release moisture to a plate cylinder. The dampening solution is applied to the distributor roller by means of a single water metering tube connected to a stationary water reservoir via a movable hose, the opening of which faces a distributor roller assigned to two application rollers and which is movably arranged by rollers on the rails which are assigned to the roller in parallel. The water metering tube, which forms a slide together with rollers, is moved back and forth uniformly on the rails when the offset printing machine is started up. The water flows from the water reservoir to the distributor roller, which is intended to achieve an even delivery of water to the circumference of the roller. The amount of water to be applied is regulated by metering the water pressure by adjusting the height of the water reservoir.

Da das Befeuchten der Verreiberwalze durch das Wasserdosierrohr nur während der gleichförmigen axialen Bewegung erfolgt, ist es mit dieser Vorrichtung nicht möglich, das Feuchtmittel zu jeder Zeit des Befeuchtungsvorganges über die ganze Länge des Walzenmantels kontinuierlich oder zonal derart aufzutragen, daß an jeder Stelle der Druckplatte das Feuchtmittel und die Farbe in einem Gleichgewichtsverhältnis stehen.Since the wetting roller is moistened by the water metering tube only during the uniform axial movement, it is not possible with this device to apply the dampening solution continuously or zonally at any time during the moistening process over the entire length of the roller shell in such a way that at every point on the pressure plate The fountain solution and the ink are in an equilibrium ratio.

Ziel der Erfindung ist es, eine Vorrichtung zum Befeuchten von Druckplattenzylindern in Offsetdruckmaschinen zu entwickeln, mit der das für Qualitätsdruck erforderliche Gleichgewichtsverhältnis von Feuchtmittel und Farbe über die ganze Länge des Druckzylinders gesichert werden kann.The aim of the invention is to develop a device for moistening printing plate cylinders in offset printing presses, with which the balance of dampening solution and ink required for quality printing can be ensured over the entire length of the printing cylinder.

Der Erfindung liegt die Aufgabe zugrunde, eine Befeuchtungsvorrichtung für derartige Druckplattenzylinder zu schaffen, mit der entsprechend der zonal erfolgten Farbdosierung das Feuchtmittel entweder über die Länge des Druckzylinders kontinuierlich oder zonal differenziert aufgetragen wird.The invention has for its object to provide a moistening device for printing plate cylinders of this type, with which the dampening solution is applied continuously or differentially zonally according to the zonal ink metering, either over the length of the printing cylinder.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß über die Länge und den Durchmesser eines dem Druckplattenzylinder, der Feuchtauftragswalze und der Feuchtreiberwalze zugeordneten Feuchtduktors ein das Feuchtmittel aufnehmender Druckbehälter angeordnet ist, dessen dem Feuchtduktor zugewandte Teil des Mantels eine kapillar-poröse Struktur aufweist, in der nebeneinander elektrische Widerstände eingelagert sind, die mittels einer elektronischen Steuerschaltung einzeln oder gruppenweise an Spannung legbar sind. Dabei ist es vorteilhaft, die Oberfläche des kapillar-porösen Mantelteiles der Krümmung des Feuchtduktors anzupassen und den Druckbehälter höhenverstellbar anzuordnen. Dem Druckbehälter sollte ein Druckregler vorgeschaltet sein. Mit dieser Befeuchtungsvorrichtung ist es auf Grund eines einstell- und regelbaren konstanten Druckes des Feuchtmittels im Druckbehälter sowie auf Grund der erfindungsgemäßen Struktur des den Feuchtduktor überdeckenden Mantelteiles des Druckbehälters möglich, über die ganze Feuchtreiberwalze und damit auch über den Druckplattenzylinder kontinuierlich einen homogenen Feuchtmittelfilm zu bilden. Mittels der einzeln oder gruppenweise an Spannung unterschiedlicher Größe gelegten Widerstände wird darüber hinaus erreicht, daß das Gleichgewichtsverhältnis von Feuchtigkeit und Farbe entsprechend der dem Druckplattenzylinder zonal zugeführten Farbmenge auch zonal, also in sehr engen Bereichen, aufrechterhalten werden kann, da sich durch die unterschiedlichen Temperaturen an den Widerständen die Kapillare in ihrer Größe verändern und ein unterschiedlicher Feuchtmitteldurchlaß bei konstanten Druckverhältnissen erzielt wird.According to the invention the object is achieved in that over the length and the diameter of a dampening roller assigned to the printing plate cylinder, the dampening roller and the dampening roller a dampening solution-receiving pressure vessel is arranged, the part of the jacket facing the dampening roller having a capillary-porous structure in which one next to the other electrical resistors are embedded, which can be connected to voltage individually or in groups by means of an electronic control circuit. It is advantageous to adapt the surface of the capillary-porous jacket part to the curvature of the damp duct and to arrange the pressure vessel in a height-adjustable manner. A pressure regulator should be connected upstream of the pressure vessel. With this humidifier, it is due an adjustable and controllable constant pressure of the dampening solution in the pressure vessel and, due to the structure according to the invention, of the jacket part of the pressure vessel covering the dampening roller, it is possible to continuously form a homogeneous dampening solution film over the entire dampening roller and thus also over the pressure plate cylinder. By means of the resistances applied individually or in groups to voltage of different sizes, it is also achieved that the equilibrium ratio of moisture and color can also be maintained zonally, that is to say in very narrow areas, in accordance with the amount of ink supplied to the printing plate cylinder, since the different temperatures adhere to one another the resistances change the size of the capillary and a different dampening solution passage is achieved at constant pressure conditions.

Mit der erfindungsgemäßen Vorrichtung ist es außerdem möglich, die zonale Feuchtmitteldosierung mittels Voreinstellung und Fernverstellung in bezug zur zonalen Farbwerkeinstellung wirk- sam werden zu lassen.With the inventive device it is also possible, the zonal dampening dosage by default and remote control with respect to the zonal inking more Setting - sam will be.

Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden, das in der einzigen Figur schematisch dargestellt ist.The invention will be explained in more detail below using an exemplary embodiment which is shown schematically in the single figure.

Über die Länge und Breite eines dem Druckplattenzylinder 1, der Feuchtauftragswalze 2 und der Feuchtreiberwalze 3 funktionell zugeordneten Feuchtduktors 4 ist der das Feuchtmittel 5 aufnehmende Druckbehälteral höhenverstellbar angeordnet, dessen dem Feuchtduktor 4 zugewandte Teil des Mantels 7 eine kapillar-poröse Struktur aufweist. In diesem Teil des Mantels 7, dessen Oberfläche zum Zwecke eines direkten Kontaktes der Krümmung des Feuchtduktors angepaßt ist, sind nebeneinander elektrische Widerstände 8 eingelagert, die durch die elektronische Steuerschaltung 9 einzeln oder gruppenweise an Spannung legbar sind. Dem Druckbehälter 6 ist zum Zwecke des Einstellens und des Aufrechterhaltens des Druckes,mit dem das Feuchtmittel 5 die kapillar-poröse Schicht des Mantels 7 durchdringen soll, ein Druckreg¢ler 10 vorgeschaltet.The height and width of a dampening roller 4 which is functionally assigned to the printing plate cylinder 1, the dampening roller 2 and the dampening roller 3 are arranged so as to be height-adjustable, the part of the jacket 7 which faces the dampening roller 4 and has a capillary-porous structure. In this part of the jacket 7, the surface of which is adapted for the purpose of direct contact with the curvature of the damp duct, there are electrical ones next to one another Resistors 8 stored, which can be connected individually or in groups to voltage by the electronic control circuit 9. The pressure vessel 6 is preceded by a pressure regulator 10 for the purpose of setting and maintaining the pressure with which the dampening solution 5 is intended to penetrate the capillary-porous layer of the jacket 7.

Bei Inbetriebnahme der Druckmaschine wird von der Pumpe 11 das Feuchtmittel 5 in den Druckbehälter 6 befördert, wo sich der am Druckregler 10 eingestellte Feuchtmitteldruck aufbaut. Mithin wird das Feuchtmittel 5 durch den kapillar-porösen Teil des Druckbehältermantels gedrückt und über den Feuchtduktor 4, die Feuchtreiberwalze 3 und die Feuchtauftragswalze 2 auf den Druckplattenzylinder 1 als homogener Feuchtigkeitsfilm übertragen. Dabei wird der Feuchtmitteldruck vom Druckregeler 10 in der eingestellten Größe gehalten.When the printing press is started up, the dampening solution 5 is conveyed by the pump 11 into the pressure container 6, where the dampening solution pressure set on the pressure regulator 10 builds up. The dampening solution 5 is thus pressed through the capillary-porous part of the pressure vessel jacket and transferred via the dampening roller 4, the dampening roller 3 and the dampening application roller 2 to the printing plate cylinder 1 as a homogeneous moisture film. The dampening solution pressure is kept in the set size by the pressure regulator 10.

Wird die Farbe zonal in unterschiedlichen Mengen auf den Druckplattenzylinder 1 aufgetragen, so ist es möglich, die unterschiedlichen Gleichgewichtsverhältnisse von Feuchtmittel und Farbe gleichfalls zonal dadurch herzustellen, indem die Widerstände 8 einzeln oder gruppenweise an Spannung unterschiedlicher Größe gelegt werden. Durch die Wärme ändert sich die Größe der Kapillare und damit deren Feuchtmitteldurchlaß. Demnach stellen der Feuchtmitteldruck und die Durchlaßfähigkeit des kapillar-porösen Teiles des Druckbehältermantels zwei für das Erzielen eines über die Feuchtreiberwalzenlänge kontinuierlichen oder zonal differenzierten homogenen Feuchtmittelauftrages auf den Druckplattenzylinder 1 wichtige und beherrschbare veränderliche Größen dar.If the ink is applied zonally in different amounts to the printing plate cylinder 1, it is possible to also zonally create the different equilibrium ratios of dampening solution and ink by applying the resistors 8 individually or in groups to voltages of different sizes. The heat changes the size of the capillary and thus its dampening solution passage. Accordingly, the dampening solution pressure and the permeability of the capillary-porous part of the pressure vessel shell are two important and controllable variable quantities for achieving a homogeneous dampening solution application on the printing plate cylinder 1 that is continuous or zonally differentiated over the length of the dampening roller.

Claims (4)

1. Vorrichtung zum Befeuchten von Druckelementen an Druckmaschinen, insbesondere zur Dosierung des Feuchtmittels auf Druckplatten in Offsetdruckmaschinen, dadurch gekennzeichnet, daß über die Länge und den Durchmesser eines dem Druckplattenzylinder (1), der Feuchtauftragswalze (2) und der Feuchtreiberwalze (3) zugeordneten Feuchtduktors (4) ein das Feuchtmittel (5) aufnehmender Druckbehälter (6) angeordnet ist, dessen dem Feuchtduktor (4) zugewandte Teil des Mantels (7) eine kapillar-poröse Struktur aufweist, in der nebeneinan- der electrische Widerstände (8) eingelagert sind, die mittels einer elektronischen Steuerschaltung (9) einzeln oder gruppenweise an Spannung legbar sind.1. Device for moistening printing elements on printing presses, in particular for metering the dampening solution on printing plates in offset printing presses, characterized in that the damping roller assigned to the printing plate cylinder (1), the dampening application roller (2) and the dampening roller (3) is associated with the length and diameter (4) a pressure vessel (6) which holds the dampening solution (5) is arranged, the part of the jacket (7) facing the dampening duct (4) has a capillary-porous structure in which electrical resistors (8) are embedded next to each other, which can be connected to voltage individually or in groups by means of an electronic control circuit (9). 2. Vorrichtung nach Patentanspruch 1, dadurch gekennzeichnet, daß die äußere Oberfläche des kapillar-porsöen Teiles des Mantels (7) der Krümmung des Feuchtduktors (4) angepaßt sind.2. Device according to claim 1, characterized in that the outer surface of the capillary-porous part of the jacket (7) of the curvature of the dampening duct (4) are adapted. 3. Vorrichtung nach Patentanspruch 1 und 2, dadurch gekennzeichnet,
daß der Druckbehälter (6) höhenverstellbar angeordnet ist.3. Device according to claim 1 and 2, characterized in
that the pressure vessel (6) is arranged adjustable in height. 4. Vorrichtung nach Patentanspruch 1 bis 3, dadurch gekennzeichnet,
daß dem Druckbehälter (6) ein Druckregeler (10) vorgeschaltet ist.4. Device according to claim 1 to 3, characterized in
that the pressure vessel (6) is preceded by a pressure regulator (10).
EP19820200706 1981-07-01 1982-06-09 Wetting device for printing elements in printing machines Expired EP0068546B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD23133881A DD200512A1 (en) 1981-07-01 1981-07-01 DEVICE FOR MOISTURIZING PRESSURE ELEMENTS ON PRINTING MACHINES
DD231338 1981-07-01

Publications (2)

Publication Number Publication Date
EP0068546A1 true EP0068546A1 (en) 1983-01-05
EP0068546B1 EP0068546B1 (en) 1984-12-05

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Application Number Title Priority Date Filing Date
EP19820200706 Expired EP0068546B1 (en) 1981-07-01 1982-06-09 Wetting device for printing elements in printing machines

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EP (1) EP0068546B1 (en)
DD (1) DD200512A1 (en)
DE (1) DE3261450D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0131108A2 (en) * 1983-07-07 1985-01-16 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Inking or damping unit for rotary printing machines
GB2211115A (en) * 1987-10-19 1989-06-28 Anthony Clarke Lacquering mechanism for rotary label printing press

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1954316A1 (en) * 1969-10-29 1971-05-19 Schluckebier Wilhelm Method and device for charging rollers in printing units of printing machines with a liquid medium, e.g. Color, and for dosing the medium
FR2175448A6 (en) * 1972-03-03 1973-10-19 Drg Packaging Ltd

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1954316A1 (en) * 1969-10-29 1971-05-19 Schluckebier Wilhelm Method and device for charging rollers in printing units of printing machines with a liquid medium, e.g. Color, and for dosing the medium
FR2175448A6 (en) * 1972-03-03 1973-10-19 Drg Packaging Ltd

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0131108A2 (en) * 1983-07-07 1985-01-16 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Inking or damping unit for rotary printing machines
EP0131108A3 (en) * 1983-07-07 1985-10-30 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Inking or damping unit for rotary printing machines
GB2211115A (en) * 1987-10-19 1989-06-28 Anthony Clarke Lacquering mechanism for rotary label printing press
GB2211115B (en) * 1987-10-19 1991-07-31 Anthony Clarke Lacquering mechanism for use with a rotary printing press

Also Published As

Publication number Publication date
DE3261450D1 (en) 1985-01-17
DD200512A1 (en) 1983-05-11
EP0068546B1 (en) 1984-12-05

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