EP0729832B1 - Feuchtwerk für eine Offsetdruckmaschine - Google Patents
Feuchtwerk für eine Offsetdruckmaschine Download PDFInfo
- Publication number
- EP0729832B1 EP0729832B1 EP96101644A EP96101644A EP0729832B1 EP 0729832 B1 EP0729832 B1 EP 0729832B1 EP 96101644 A EP96101644 A EP 96101644A EP 96101644 A EP96101644 A EP 96101644A EP 0729832 B1 EP0729832 B1 EP 0729832B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- dampening
- damping
- length
- rollers
- 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
Links
Images
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 invention relates to a dampening system for an offset printing press with at least one assigned to the plate cylinder dampening roller according to the preamble of Main claim.
- a dampening unit of this type is known from DE-AS 2 007 554. Accordingly, one is Dampening roller designed as a dampener, the outer surface of which is one of the edge areas Doing inside has decreasing roughness. This dampening roller serves the better Moisture of the edge zones on the printing plate and a streak-free moistening. From The disadvantage is that when dampening rollers and ink rollers are coupled with integrated Dampening by means of a bridge roller) too much dampening solution can get into the inking unit. This leads to disturbances in the ink / fountain solution balance, since the printing ink is too large Absorbs a lot of dampening solution. A print quality is adversely affected Emulsion.
- Another dampening system is known from DE-OS 2 320 430.
- the one as a wet doctor (Dip roller) acting measuring roller is longer than the neighboring transfer roller.
- the transfer roller itself is in turn preferably longer than that adjacent to the plate cylinder Moist application roller (form roller).
- This arrangement of the rollers with the The dampening roller towards the dampening roller with increasing axial length is supposed to collect keep dampening solution at the ends of the rollers low or avoid it. With that possible disturbances in the ink / fountain solution balance can be prevented.
- a dampening unit is known from DE 3 030 076 C1, in which the metering roller and the dampening roller is longer than the dampening rollers. From two neighboring ones Dampening rollers have at least one rubber-elastic layer. Has a roller a narrowing of the diameter in its edge areas. In order to the contact pressure between the two rollers should be reduced, at the same time the undesired supply of dampening solution to the end faces can be prevented. The disadvantage is that this solution is only suitable for rubber-elastic rollers.
- a printing machine which among other things Dampening unit, and a plate cylinder carrying a printing plate.
- the plate cylinder is assigned a dampening roller, which one on both ends Has roller diameter reduction.
- the roll diameter reduction begins already on the printing plate.
- the object of the invention is to develop a solution m that the dampening solution on the Includes pressure plate in the design of the dampening roller.
- each dampening roller adjacent to the plate cylinder has a special outer contour at its ends (end area).
- the axial roller length of each dampening roller adjacent to the plate cylinder is the same or slightly longer than the downstream dampening roller in dampening unit.
- the dampening application roller has a reduction in the roller diameter at both roller ends. Each end of the roller is chamfered at an acute angle ⁇ . The reduction in the roller diameter of the dampening roller begins in a range between the respective printing plate format and the printing material format.
- the design of the dampening roller results in a very even film of water on the printing plate, which is also stable in the side area of the printing plate that is critical in terms of printing technology (maximum printing material format).
- maximum substrate format can be used as the maximum printing area.
- the printing material can be printed across the entire width without having a visually visible white border on the side.
- the dampening solution supply on the pressure plate of the plate cylinder becomes more precise, since a noticeable, even roller strip is generated by the dampening roller on the plate cylinder or the pressure plate itself.
- This has the advantage that a possible spraying of dampening solution or detergent (in the operating position Wash the paws ”) and prevent the emulsification of dampening solution and ink.
- longer rollers are required for comparable printing material formats in order to produce an approximately uniform film of dampening solution on the printing plate.
- the printing unit of an offset printing machine is a printing plate supporting plate cylinder 1 and a blanket cylinder 2 are formed.
- the plate cylinder 1 a dampening roller roller 7 and an inking roller roller 9 are assigned.
- Means a switchable bridge roller 8 can the dampening roller 7 in the inking roller 9 can be integrated.
- the dampening roller roller 7 consists of a Fountain solution container 3, a dipping in the dampening solution container 3 and dampening solution scooping dampening roller 4, a metering roller 5 adjacent to dampening roller 4 and a dampening roller 6.
- the dampening roller 6 is the plate cylinder 1 in assigned in a known manner. On other known components of the printing unit are not further discussed here.
- the dampening rollers 6, the dampening roller 4 and the metering roller are located 5 with a uniform roller length 17 in one roller alignment 14.
- the dampening roller 6 forms its roll length 17 by a first roll length assigned to each end face 15 and a second roller length 16 arranged in the middle part.
- the wide roller length 16 has a uniform roller diameter.
- the first roll length 15 each has a roller diameter reduction 12.
- the roll diameter reduction In the present example, 12 is formed by a bevel which is at an acute angle Angle ⁇ drops to each end of the dampening roller 6.
- an acute angle ⁇ of 1 to 15 degrees is preferred.
- ... has an apex 19 which is in a region 13 on plate cylinder 1 lies.
- the area 13 is defined by a printing material format 11 and a printing plate format 10 limited. Furthermore, depending on the existing Shore hardness, the dampening roller 6 is the first Roll length 15 formed in a preferred range of> 20mm on each side. Amounts the difference (area 13) between substrate format 11 and printing plate format 10.5 mm, the apex 19 is arranged centrally at 2.5 mm in the area 13. Of the Roll strip is approx. 7mm.
- the dampening duct 4 conveys the liquid Medium in the form of dampening solution from the dampening solution tank 3.
- the metering roller 5 splits the dampening solution film on the dampening roller 4 and the dampening solution is applied to the Dampening roller 6 transported, which in turn the dampening solution film on the printing plate applies.
- the middle area of the dampening roller 6, characterized by the second roller length 16 sufficient dampening solution is performed.
- the marginal areas of the Moist application roller 6, characterized by a respective first roller length 15 with a corresponding one Roll diameter reduction 12 less dampening solution is performed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Description
Bei herkömmlichen Feuchtwerken sind bei vergleichbaren Bedruckstofformaten längere Walzen erforderlich, um einen annähernd gleichmäßigen Feuchtmittelfilm auf der Druckplatte zu erzeugen.
- Fig. 1
- ein Feuchtwerk einer Offsetdruckmaschine,
- Fig. 2
- eine Feuchtwerkswalzenanordnung.
- 1
- Plattenzylinder
- 2
- Gummituchzylinder
- 3
- Feuchtmittelbehälter
- 4
- Feuchtduktor
- 5
- Dosierwalze
- 6
- Feuchtauftragwalze
- 7
- Feuchtwerkswalzenzug
- 8
- Brückenwalze
- 9
- Farbwerkswalzenzug
- 10
- Druckplattenformat
- 11
- Bedruckstofformat
- 12
- Walzendurchmesserreduzierung
- 13
- Bereich
- 14
- Walzenflucht
- 15
- erste Walzenlänge
- 16
- zweite Walzenlänge
- 17
- Walzenlänge
- 18
- Feuchtmittelrückfluß
- 19
- Scheitelpunkt
- α
- spitzer Winkel
Claims (4)
- Feuchtwerk für eine Offset-Druckmaschine mit einem eine Druckplatte tragenden Plattenzylinder (1) und mindestens einer dem Plattenzylinder zugeordneten Feuchtauftragswalze (6) und nachgeordneten Feuchtmittel führenden Walzen (7), wobei die Feuchtauftragswalze zu einem Druckplattenformat (10) eine überstehende axiale Walzenlänge (17) aufweist, wobei die axiale Walzenlänge durch eine mittig mit einheitlichem Walzendurchmesser angeordnete Walzenlänge (16) und zwei stirnseitig zugeordneten Walzenlängen (15) gebildet ist, wobei die stirnseitig zugeordneten Walzenlängen eine Walzendurchmesserreduzierung (12) besitzen
dadurch gekennzeichnet,
daß die Walzendurchmesserreduzierung (12) der Feuchtauftragswalze (6) eine stirnseitige in einem spitzen Winkel (α) abfallende umlaufende Schräge mit einem Scheitelpunkt (19) in einem aus der Differenz von Bedruckstofformat (11) und Druckplattenformat (10) gebildeten Bereich (13) am Plattenzylinder (1) aufweist. - Feuchtwerk nach Anspruch 1,
dadurch gekennzeichnet,
daß die Feuchtauftragswalze (6) eine axiale Walzenlänge (17) aufweist und die nachgeordneten Walzen (4,5) des Feuchtwerkwalzenzuges (7) die gleiche axiale Walzenlänge (17) aufweisen, wobei alle Walzen (6,4,5) stirnseitig in einer Walzenflucht (14) angeordnet sind. - Feuchtwerk nach Anspruch 1,
dadurch gekennzeichnet,
daß die axiale Walzenlänge (17) der Feuchtauftragswalze (6) größer ist als die der nachgeordneten Walzen (4,5) des Feuchtwerkswalzenzuges (7). - Feuchtwerk nach Anspruch 1,
dadurch gekennzeichnet,
daß die Walzendurchmesserreduzierung (12) im Bereich einer durch den Scheitelpunkt (19) und dieStirnseite gebildeten Walzenlänge (15) einen Winkel (α) von 1 bis 15 Grad besitzt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19506923 | 1995-02-28 | ||
DE19506923A DE19506923C1 (de) | 1995-02-28 | 1995-02-28 | Feuchtwerk für eine Offsetdruckmaschine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0729832A2 EP0729832A2 (de) | 1996-09-04 |
EP0729832A3 EP0729832A3 (de) | 1997-01-02 |
EP0729832B1 true EP0729832B1 (de) | 1998-10-28 |
Family
ID=7755228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96101644A Expired - Lifetime EP0729832B1 (de) | 1995-02-28 | 1996-02-06 | Feuchtwerk für eine Offsetdruckmaschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US5680815A (de) |
EP (1) | EP0729832B1 (de) |
JP (1) | JP2898597B2 (de) |
AT (1) | ATE172669T1 (de) |
DE (2) | DE19506923C1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1237411C (zh) * | 2000-06-07 | 2006-01-18 | 株式会社理光 | 显影剂限制部件、显影装置、处理卡盒及图像形成装置 |
CN101045367A (zh) * | 2006-03-28 | 2007-10-03 | 海德堡印刷机械股份公司 | 网纹辊印刷装置 |
DE102008011241B4 (de) | 2008-02-26 | 2015-06-11 | manroland sheetfed GmbH | Verarbeitungsmaschine mit einem Kurzfarbwerk |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2065535A (en) * | 1933-11-06 | 1936-12-29 | Addressograph Multigraph | Planographic printing machine |
US2102641A (en) * | 1934-11-22 | 1937-12-21 | Addressograph Multigraph | Method of and apparatus for planographic printing |
DE1090682B (de) * | 1958-09-04 | 1960-10-13 | Erich Gericke | Offset-Druckmaschine mit Feucht- und Farbwerk |
US3448686A (en) * | 1966-12-05 | 1969-06-10 | Miehle Goss Dexter Inc | Form roller setting and control means |
DE1940661C3 (de) * | 1969-08-09 | 1973-07-12 | Roland Offsetmaschf | Feuchteinrichtung fuer lithographische Druckmaschinen |
DE1951976A1 (de) * | 1969-10-15 | 1971-04-22 | Roland Offsetmaschf | Feuchteinrichtung fuer lithographische Druckmaschinen |
DE2007554B1 (de) * | 1970-02-19 | 1971-08-26 | Maschinenfabrik Augsburg Nürnberg AG, 8900 Augsburg | Alkoholfeuchtwerk für Offsetdruckma schinen |
DE2054678C3 (de) * | 1970-11-06 | 1975-05-22 | Roland Offsetmaschinenfabrik Faber & Schleicher Ag, 6050 Offenbach | Feuchtwerk für lithographische Druckmaschinen |
CA1011995A (en) * | 1972-08-14 | 1977-06-14 | Dahlgren Manufacturing Company | Liquid applicator for lithographic systems |
DE3030076C1 (de) * | 1980-08-08 | 1982-06-16 | Rotaprint Gmbh, 1000 Berlin | Offset-Druckmaschine mit einem Farb- und Feuchtwerk |
DD238574A1 (de) * | 1985-06-25 | 1986-08-27 | Polygraph Leipzig | Verfahren und einrichtung zur beseitigung von putzen auf der druckplatte |
-
1995
- 1995-02-28 DE DE19506923A patent/DE19506923C1/de not_active Expired - Fee Related
-
1996
- 1996-02-06 AT AT96101644T patent/ATE172669T1/de not_active IP Right Cessation
- 1996-02-06 EP EP96101644A patent/EP0729832B1/de not_active Expired - Lifetime
- 1996-02-06 DE DE59600722T patent/DE59600722D1/de not_active Expired - Fee Related
- 1996-02-27 JP JP8039752A patent/JP2898597B2/ja not_active Expired - Fee Related
- 1996-02-28 US US08/608,151 patent/US5680815A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ATE172669T1 (de) | 1998-11-15 |
EP0729832A3 (de) | 1997-01-02 |
JPH08244196A (ja) | 1996-09-24 |
DE59600722D1 (de) | 1998-12-03 |
US5680815A (en) | 1997-10-28 |
DE19506923C1 (de) | 1996-06-27 |
EP0729832A2 (de) | 1996-09-04 |
JP2898597B2 (ja) | 1999-06-02 |
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