EP0336178A2 - Damping system for a web-fed offset rotary press - Google Patents

Damping system for a web-fed offset rotary press Download PDF

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Publication number
EP0336178A2
EP0336178A2 EP89104864A EP89104864A EP0336178A2 EP 0336178 A2 EP0336178 A2 EP 0336178A2 EP 89104864 A EP89104864 A EP 89104864A EP 89104864 A EP89104864 A EP 89104864A EP 0336178 A2 EP0336178 A2 EP 0336178A2
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EP
European Patent Office
Prior art keywords
diameter
plate cylinder
roller
dampening solution
applicator roller
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Withdrawn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
EP89104864A
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German (de)
French (fr)
Other versions
EP0336178A3 (en
Inventor
Arthur Hilner
Anton Hamm
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen 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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0336178A2 publication Critical patent/EP0336178A2/en
Publication of EP0336178A3 publication Critical patent/EP0336178A3/en
Withdrawn legal-status Critical Current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
    • B41F7/26—Damping devices using transfer rollers

Definitions

  • the invention relates to a dampening system on a web-fed rotary offset printing machine, the dampening solution applicator roller of which can be adjusted directly to a plate cylinder.
  • a generic dampening system is known from DE-OS 30 16 366.
  • the dampening solution is removed from a dampening solution box by means of a dampening duct and delivered directly to a plate cylinder via a dampening solution application roller.
  • the dampening solution applicator roller rolls over the clamping channels of the plate cylinder no dampening solution is removed, and strips with an excess of dampening solution are formed on the dampening solution application roller, which act into the printed image.
  • the dampening solution application roller also receives dampening solution from the plate cylinder, which collects there in the water-accepting areas.
  • the invention has for its object to develop a generic dampening system such that a reaction-free application of a needs-based wet film on the plate cylinder is made possible without additional effort.
  • Fig. 1 shows a partial side view of a printing unit of a web-fed offset printing press.
  • 1 is a blanket cylinder
  • 2 denotes a plate cylinder attached to it, in these two clamping channels 21, 22 the ends of two pressure plates lying against its circumference are fixed.
  • a dampening solution applicator roller 3 is directly employed.
  • a first transfer roller 4 is in contact with the latter, which in turn is in contact with a second transfer roller 5.
  • a dampening solution transmitter 6 is in contact with the second transfer roller 5.
  • This can be designed as a dampening solution immersed in a dampening solution box or as a siphon roller.
  • the dampening solution can also be delivered to the second transfer roller 5 by a spraying or spinning device.
  • the diameter of the dampening solution applicator roller 3 is selected so that it is one or 1 / n times the diameter of the plate cylinder 2 for a number of n clamping channels. This prevents the strips with excess dampening solution which build up on the dampening solution application roller 3 due to the tensioning channels 21, 22 from being deposited in another circumferential region of the plate cylinder 2 during the next rotation.
  • the diameter d3 of the dampening solution applicator roller 3 is exactly as large as the diameter d2 of the plate cylinder 2.
  • a plate cylinder 9 is attached to a blanket cylinder 8, in which the two clamping channels 91, 92 have the ends of two pressure plates attached to its circumference fastened.
  • This plate cylinder 9 is supplied with dampening solution directly via a dampening solution application roller 10.
  • a first upper support roller 11 is in turn attached to the dampening solution applicator roller 10, and a second upper support roller 12 is attached to it.
  • the dampening solution is fed from a dampening solution transmitter 13 to the second top roller 12.
  • one of the known types of fountain solution application which were already enumerated in the first exemplary embodiment, can optionally be used.
  • the diameter d 1 of the dampening solution applicator roller 10 is exactly half the size - with two clamping channels thus 1 / n times - as the diameter d 1 of the plate cylinder 9.
  • the diameter d11 of the first transfer roller 11 is formed as large as the diameter d10 of the dampening roller 10th
  • the teaching according to the invention formulated in the patent claims permits further combinations with regard to the diameter ratio.
  • the diameter d4 of the first transfer roller 4 can be designed to be as large as that of the two aforementioned.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)

Abstract

In known damping systems, the damping solution is fed from a damping solution reservoir and passed on by means of transfer rollers to an applicator roller which is positioned directly against a plate cylinder. A uniform film of damping solution is fed to the applicator roller from the transfer rollers. Streaks of excess damping solution are formed on the applicator cylinder because of the clamping channels on the plate cylinder. Furthermore, the applicator roller takes off excess damping solution from the hydrophilic areas of the surface of the plate cylinder and releases it at another point on renewed contact with the plate cylinder. This leads to the undesired formation of streaks in the printed image. In accordance with the invention, the diameter of the damping solution applicator roller (3) relative to that of the plate cylinder (2) is so determined that for n clamping channels, its diameter is a 1/n multiple of or is equal to its diameter. In a further advantageous embodiment, the damping solution applicator roller (3) has a diameter which is an integral multiple, preferably a multiple of one, of the diameter of a transfer roller (4) positioned ahead of it. <IMAGE>

Description

Die Erfindung betrifft ein Feuchtwerk an einer Rollenrotations-­Offsetdruckmaschine, dessen Feuchtmittel- Auftragwalze unmittelbar an einen Plattenzylinder anstellbar ist.The invention relates to a dampening system on a web-fed rotary offset printing machine, the dampening solution applicator roller of which can be adjusted directly to a plate cylinder.

Aus der DE-OS 30 16 366 ist ein gattungsgemäßes Feuchtwerk bekannt. Bei diesem wird das Feuchtmittel mittels eines Feuchtduktors einem Feuchtmittelkasten entnommen und über eine Feuchtmittel-­Auftragwalze unmittelbar an einen Plattenzylinder abgegeben. An den Stellen, an denen die Feuchtmittel- Auftragwalze über die Spannkanäle des Plattenzylinders rollt, wird kein Feuchtmittel abgenommen, und es entstehen an der Feuchtmittel- Auftragwalze Streifen mit einem Feuchtmittel-Oberschuß, die bis ins Druckbild hineinwirken. Die Feuchtmittel- Auftragwalze nimmt als Rückwirkung ferner Feuchtmittel vom Plattenzylinder auf, das sich dort in den Wasser annehmenden Flächen sammelt. Zur Vergleichmäßigung des Feuchtmittelfilms wird bei der bekannten Anordnung an die Auftragwalze eine zusätzliche Reiberwalze angestellt. Abgesehen vom zusätzlichen Aufwand, den die Reiberwalze verursacht, läßt sich mit dieser Anordnung eine Streifenbildung im Druckbild, die aus den am Plattenzylinder in wechselnden Umfangsbereichen auftretenden Streifen uberschüssigen Feuchtmittels resultiert, nicht immer wirkungsvoll verhindern.A generic dampening system is known from DE-OS 30 16 366. In this case, the dampening solution is removed from a dampening solution box by means of a dampening duct and delivered directly to a plate cylinder via a dampening solution application roller. At the points at which the dampening solution applicator roller rolls over the clamping channels of the plate cylinder, no dampening solution is removed, and strips with an excess of dampening solution are formed on the dampening solution application roller, which act into the printed image. As a reaction, the dampening solution application roller also receives dampening solution from the plate cylinder, which collects there in the water-accepting areas. In order to equalize the dampening solution film, an additional friction roller is placed on the applicator roller in the known arrangement. Apart from the additional effort caused by the friction roller, this arrangement does not always effectively prevent streaking in the printed image, which results from the excess dampening solution streaks occurring on the plate cylinder in changing circumferential areas.

Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Feuchtwerk derart weiterzubilden, daß ohne zusätzlichen Aufwand ein rückwirkungsfreies Auftragen eines bedarfsgerechten Feuchtfilms auf den Plattenzylinder ermöglicht wird.The invention has for its object to develop a generic dampening system such that a reaction-free application of a needs-based wet film on the plate cylinder is made possible without additional effort.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale im Kennzeichen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen.This object is achieved by the features in the characterizing part of claim 1. Advantageous embodiments of the invention can be found in the subclaims.

Nachfolgend ist die Erfindung anhand zweier Ausführungsbeispiele erklärt. Dabei zeigt

  • Fig. 1 ein Feuchtwerk mit einer Feuchtmittel- Auftragwalze, deren Durchmesser dem des Plattenzylinders entspricht,
  • Fig. 2 ein Feuchtwerk mit einer Feuchtmittel- Auftragwalze, deren Durchmesser halb so groß ist wie der des Plattenzylinders.
The invention is explained below using two exemplary embodiments. It shows
  • 1 shows a dampening system with a dampening solution applicator roller, the diameter of which corresponds to that of the plate cylinder,
  • Fig. 2 shows a dampening system with a dampening solution applicator roller, the diameter of which is half that of the plate cylinder.

Fig. 1 zeigt eine teilweise Seitenansicht eines Druckwerkes einer Rollenrotations- Offsetdruckmaschine. Mit 1 ist ein Gummituchzylinder, mit 2 ein an diesen angestellter Plattenzylinder bezeichnet, in diesen zwei Spannkanälen 21, 22 die Enden zweier an seinem Umfang anliegender Druckplatten fixiert sind. An den Plattenzylinder 2 ist eine Feuchtmittel- Auftragwalze 3 unmittelbar angestellt. Mit letzterer steht eine erste Übertragwalze 4 in Kontakt, die wiederum in Berührung mit einer zweiten Übertragwalze 5 steht. Mit der zweiten Übertragwalze 5 steht ein Feuchtmittel- Geber 6 in Kontakt. Dieser kann als in einen Feuchtmittelkasten eintauchender Feuchtmittel- Duktor oder als Heberwalze ausgebildet sein. Die Abgabe des Feuchtmittels an die zweite Übertragwalze 5 kann jedoch auch von einer Sprüh- oder Schleudervorrichtung erfolgen.Fig. 1 shows a partial side view of a printing unit of a web-fed offset printing press. 1 is a blanket cylinder, 2 denotes a plate cylinder attached to it, in these two clamping channels 21, 22 the ends of two pressure plates lying against its circumference are fixed. At the plate cylinder 2, a dampening solution applicator roller 3 is directly employed. A first transfer roller 4 is in contact with the latter, which in turn is in contact with a second transfer roller 5. A dampening solution transmitter 6 is in contact with the second transfer roller 5. This can be designed as a dampening solution immersed in a dampening solution box or as a siphon roller. However, the dampening solution can also be delivered to the second transfer roller 5 by a spraying or spinning device.

Erfindungsgemäß ist der Durchmesser der Feuchtmittel- Auftragwalze 3 so gewählt, daß er bei einer Anzahl von n Spannkanälen ein Einfaches oder ein 1/n-faches des Durchmessers des Plattenzylinders 2 beträgt. Hierdurch wird verhindert, daß sich die aufgrund der Spannkanäle 21, 22 an der Feuchtmittel- Auftragwalze 3 aufbauendem Streifen mit überschüssigem Feuchtmittel bei der nächsten Umdrehung in einem anderen Umfangsbereich des Plattenzylinders 2 ablegen.According to the invention, the diameter of the dampening solution applicator roller 3 is selected so that it is one or 1 / n times the diameter of the plate cylinder 2 for a number of n clamping channels. This prevents the strips with excess dampening solution which build up on the dampening solution application roller 3 due to the tensioning channels 21, 22 from being deposited in another circumferential region of the plate cylinder 2 during the next rotation.

Bei der im ersten Ausführungsbeispiel dargestellten bevorzugten Variante ist der Durchmesser d₃ der Feuchtmittel- Auftragwalze 3 genau so groß wie der Durchmesser d₂ des Plattenzylinders 2. Durch diese Größenauswahl wird zusätzlich verhindert, daß von den Partien des Plattenzylinders 2, die Feuchtmittel annehmend sind, überschüssiges Feuchtmittel auf Teile der Feuchtmittel- Auftragwalze 3 übertragen wird, die bei der nächsten Umdrehung mit einem anderen Teil der Oberfläche des Plattenzylinders 2 in Berührung geraten und dort Feuchtmittel-Streifen verursachen würden.In the preferred variant shown in the first embodiment, the diameter d₃ of the dampening solution applicator roller 3 is exactly as large as the diameter d₂ of the plate cylinder 2. By this size selection is additionally prevented that from the parts of the plate cylinder 2, which accept dampening solution, excess dampening solution is transferred to parts of the dampening solution applicator roller 3, which come into contact with another part of the surface of the plate cylinder 2 during the next rotation and there Would cause dampening solution streaks.

Bei einem zweiten Ausführungsbeispiel gemäß Fig. 2 entspricht der Aufbau im großen und ganzen dem ersten Ausführungsbeispiel. An einen Gummituchzylinder 8 ist ein Plattenzylinder 9 angestellt, in diesen beiden Spannkanälen 91, 92 die Enden zweier an seinem Umfang anliegender Druckplatten befestigt sind. Diesem Plattenzylinder 9 wird über eine Feuchtmittel-Auftragwalze 10 Feuchtmittel unmittelbar zugeführt. An die Feuchtmittel-Auftragwalze 10 ist wiederum eine erste Obertragwalze 11, an diese eine zweite Obertragwalze 12 angestellt. Der zweiten Obertragwalze 12 wird das Feuchtmittel von einem Feuchtmittel-Geber 13 zugeführt. Auch hier kann wahlweise eine der bekannten Feuchtmittel-Auftragsarten, die bereits beim ersten Ausführungsbeispiel aufgezählt wurden, verwendet werden. Zur Vermeidung der unerwünschten Streifenbildung im Druckbild ist bei dieser zweiten Ausführungsform der Durchmesser d₁₀ der Feuchtmittel-Auftragwalze 10 exakt halb so groß - bei zwei Spannkanälen somit das 1/n-fache - wie der Durchmesser d₉ des plattenzylinders 9 ausgelegt. Zur Erhöhung der Sicherheit gegen Feuchtmittel-Streifenbildung ist bei dieser Variante der Durchmesser d₁₁ der ersten Übertragwalze 11 so groß ausgebildet wie der Durchmesser d₁₀ der Feuchtmittel- Auftragwalze 10.In a second exemplary embodiment according to FIG. 2, the structure largely corresponds to the first exemplary embodiment. A plate cylinder 9 is attached to a blanket cylinder 8, in which the two clamping channels 91, 92 have the ends of two pressure plates attached to its circumference fastened. This plate cylinder 9 is supplied with dampening solution directly via a dampening solution application roller 10. A first upper support roller 11 is in turn attached to the dampening solution applicator roller 10, and a second upper support roller 12 is attached to it. The dampening solution is fed from a dampening solution transmitter 13 to the second top roller 12. Here, too, one of the known types of fountain solution application, which were already enumerated in the first exemplary embodiment, can optionally be used. To avoid unwanted streaking in the printed image in this second embodiment, the diameter d 1 of the dampening solution applicator roller 10 is exactly half the size - with two clamping channels thus 1 / n times - as the diameter d 1 of the plate cylinder 9. To increase the security against dampening streak formation in this variant, the diameter d₁₁ of the first transfer roller 11 is formed as large as the diameter d₁₀ of the dampening roller 10th

Die in den Patentansprüchen formulierte erfindungsgemäße Lehre läßt noch weitere Kombinationen bezüglich des Durchmesserverhältnis zu. So kann beispielsweise in einer weiteren vorteilhaften Ausgestaltung ausgehend vom ersten Ausführungsbeispiel, in dem der Durchmesser d₃ der Feuchtmittel- Auftragwalze 3 dem Durchmesser d₂ des Plattenzylinders entspricht, der Durchmesser d₄ der ersten Übertragwalze 4 eben so groß ausgelegt sein, wie der der beiden vorgenannten.The teaching according to the invention formulated in the patent claims permits further combinations with regard to the diameter ratio. For example, in a further advantageous embodiment, starting from the first embodiment in which the diameter d₃ of the dampening solution applicator roller 3 corresponds to the diameter d₂ of the plate cylinder, the diameter d₄ of the first transfer roller 4 can be designed to be as large as that of the two aforementioned.

Claims (3)

1. Feuchtwerk an einer Rollenrotations- Offsetdruckmaschine, dessen Feuchtmittel- Auftragwalze unmittelbar an einen Plattenzylinder anstellbar ist, an dem in n Spannkanälen n Druckplatten befestigt sind, dadurch gekennzeichnet, daß der Durchmesser der Feuchtmittel- Auftragwalze (3; 10) ein Einfaches oder ein 1/n-faches des Plattenzylinders (2; 9) beträgt.1. Dampening unit on a web-fed rotary offset printing machine, the dampening solution applicator roller can be adjusted directly to a plate cylinder, to which n printing plates are fastened in n clamping channels, characterized in that the diameter of the dampening solution application roller (3; 10) is a simple or a 1 / n times the plate cylinder (2; 9). 2. Feuchtwerk gemäß Anspruch 1, dadurch gekennzeichnet, daß der Durchmesser der Feuchtmittel- Auftragwalze (3) dem Durchmesser des Plattenzylinders (2) entspricht.2. Dampening unit according to claim 1, characterized in that the diameter of the dampening solution application roller (3) corresponds to the diameter of the plate cylinder (2). 3. Feuchtwerk gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Durchmesser der Feuchtmittel- Auftragwalze (3; 10) einem Einfach oder einem n-fachen des Durchmessers einer ihr vorgeschalteten Übertragwalze (4; 11) beträgt.3. Dampening unit according to one of the preceding claims, characterized in that the diameter of the dampening solution applicator roller (3; 10) is one or n times the diameter of an upstream transfer roller (4; 11).
EP89104864A 1988-04-02 1989-03-18 Damping system for a web-fed offset rotary press Withdrawn EP0336178A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883811288 DE3811288A1 (en) 1988-04-02 1988-04-02 DAMPING UNIT ON A ROLLING ROTATION OFFSET PRINTING MACHINE
DE3811288 1988-04-02

Publications (2)

Publication Number Publication Date
EP0336178A2 true EP0336178A2 (en) 1989-10-11
EP0336178A3 EP0336178A3 (en) 1990-05-09

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Application Number Title Priority Date Filing Date
EP89104864A Withdrawn EP0336178A3 (en) 1988-04-02 1989-03-18 Damping system for a web-fed offset rotary press

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EP (1) EP0336178A3 (en)
JP (1) JPH01299038A (en)
DE (2) DE8816770U1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004042262B4 (en) * 2004-09-01 2014-03-06 Koenig & Bauer Aktiengesellschaft Rotary press

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1073002B (en) * 1960-01-14 Institut für grafische Technik, Leipzig Method and device for moistening printing plates for rotary collotype printing
GB2035903A (en) * 1978-11-15 1980-06-25 Polygraph Leipzig Moistening apparatus
JPS57107837A (en) * 1980-12-25 1982-07-05 Akiyama Insatsuki Seizo Kk Water supplying mechanism in printing machine
JPS57207064A (en) * 1981-06-17 1982-12-18 Komori Printing Mach Co Ltd Water supplier for lithographic rotary printer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD144155B1 (en) * 1979-06-06 1988-04-27 Hans Johne WETTING WORK FOR ROTATION OFFSET PRINTING MACHINES
DE3232780C2 (en) * 1981-10-31 1986-02-06 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Inking unit for offset printing machines
JPS62113551A (en) * 1985-11-13 1987-05-25 Mitsubishi Heavy Ind Ltd Dampening device of lithographic printer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1073002B (en) * 1960-01-14 Institut für grafische Technik, Leipzig Method and device for moistening printing plates for rotary collotype printing
GB2035903A (en) * 1978-11-15 1980-06-25 Polygraph Leipzig Moistening apparatus
JPS57107837A (en) * 1980-12-25 1982-07-05 Akiyama Insatsuki Seizo Kk Water supplying mechanism in printing machine
JPS57207064A (en) * 1981-06-17 1982-12-18 Komori Printing Mach Co Ltd Water supplier for lithographic rotary printer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 201 (M-163)(1079) 13 Oktober 1982, & JP-A-57 107837 (AKIYAMA INSATSUKI SEIZOU K.K.) 05 Juli 1982, *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 63 (M-200)(1208) 16 März 1983, & JP-A-57 207064 (KOMORI INSATSU KIKAI K.K.) 18 Dezember 1982, *

Also Published As

Publication number Publication date
EP0336178A3 (en) 1990-05-09
DE8816770U1 (en) 1990-08-09
DE3811288A1 (en) 1989-10-19
JPH01299038A (en) 1989-12-01

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