EP0729832A2 - Dispositif de mouillage pour une machine à imprimer offset - Google Patents
Dispositif de mouillage pour une machine à imprimer offset Download PDFInfo
- Publication number
- EP0729832A2 EP0729832A2 EP96101644A EP96101644A EP0729832A2 EP 0729832 A2 EP0729832 A2 EP 0729832A2 EP 96101644 A EP96101644 A EP 96101644A EP 96101644 A EP96101644 A EP 96101644A EP 0729832 A2 EP0729832 A2 EP 0729832A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- dampening
- length
- printing
- 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.)
- Granted
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 unit for an offset printing press with at least one dampening roller assigned to the plate cylinder according to the preamble of the main claim.
- a dampening unit of this type is known from DE-AS 2 007 554. Accordingly, a dampening roller is designed as a dampener, the outer surface of which has a roughness that decreases inwards from the edge regions. This dampening roller is used for better dampening of the edge zones on the printing plate and for streak-free moistening.
- the disadvantage here is that when dampening rollers and inking 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 absorbs an excessive amount of fountain solution. An emulsion is formed that negatively affects print quality.
- the measuring roller which acts as a dampening roller (plunger roller) is longer than the adjacent transfer roller.
- the transfer roller itself is in turn preferably longer than the dampening roller (forming roller) adjacent to the plate cylinder.
- This arrangement of the rollers with increasing axial length from the dampening roller to the dampening roller is intended to keep or avoid the accumulation of dampening solution at the ends of the rollers. This is to prevent possible disturbances in the ink / fountain solution balance.
- a dampening unit is known from DE 3 030 076 C1, in which the metering roller and the dampening roller are longer than the dampening application rollers. At least one of two adjacent dampening rollers has a rubber-elastic layer. A roller has a tapering of the diameter in its edge areas. This is intended to reduce the contact pressure between the two rollers, and at the same time undesired supply of dampening solution to the end faces can be prevented. The disadvantage here is that this solution is only suitable for rubber-elastic rollers.
- the object of the invention is to develop a solution that includes the dampening solution guide on the printing plate in the design of the dampening unit rollers.
- the length ratios of the printing plate width Printing material width and the axial length of the dampening unit rollers are taken into account together and the dampening roller adjacent to the printing plate 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 the dampening unit.
- the dampening roller has a reduction in the roller diameter at both roller ends. Each roller end is preferably beveled 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 stable even 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 splashing of dampening solution or detergent (in the operating position "wash rollers") and the emulsification of dampening solution and ink is prevented.
- the printing unit of an offset printing machine is formed by a plate cylinder 1 carrying a printing plate and a blanket cylinder 2.
- a dampening unit roller 7 and an inking unit roller 9 are assigned to the plate cylinder 1.
- the dampening unit roller train 7 can be integrated into the inking unit roller train 9 by means of a switchable bridge roller 8.
- the dampening unit roller train 7 consists of a dampening solution tank 3, a dampening roller 4 immersing in the dampening solution container 3 and drawing dampening solution, a metering roller 5 adjacent to the dampening roller 4 and a dampening application roller 6.
- the dampening application roller 6 is assigned to the plate cylinder 1 in a known manner. Further known components of the printing unit will not be discussed further here.
- the dampening rollers 6, the dampening roller 4 and the metering roller 5 with a uniform roller length 17 lie in a roller alignment 14.
- the dampening roller 6 forms its roller length 17 by means of a first roller length 15 assigned to each end face and a second roller length 16 arranged in the middle part
- the second roll length 16 has a uniform roll diameter.
- the first roll length 15 each has a roll diameter reduction 12.
- the roller diameter reduction 12 is formed in the present example by a bevel, which drops at an acute angle ⁇ to each end of the dampening roller 6.
- an acute angle ⁇ of 1 to 15 degrees is preferred.
- the angle ... has an apex 19 which lies on the plate cylinder 1 in an area 13.
- the area 13 is delimited by a printing material format 11 and a printing plate format 10. Furthermore, depending on the Shore hardness of the dampening roller 6, the first roller length 15 is formed in a preferred range of> 20 mm on each side. If the difference (area 13) between printing material format 11 and printing plate format 10 is 5 mm, then the apex 19 is arranged in the center at 2.5 mm in area 13. The roller strip is approx. 7mm.
- the invention is not restricted to the exemplary embodiment. Rather, the solution according to the invention is also suitable for dampening units with several dampening rollers assigned to the plate cylinder and dampening roller trains with a different roller arrangement.
- the dampening roller 4 conveys the liquid medium in the form of dampening solution from the dampening solution container 3.
- the metering roller 5 splits the dampening solution film on the dampening unit 4 and the dampening solution is transported to the dampening application roller 6, which in turn applies the dampening solution film to the printing plate.
- Sufficient dampening solution is guided in the central area of the dampening roller 6, characterized by the second roller length 16. In the edge areas of the dampening roller 6, each characterized by a first roller length 15 with a corresponding roller diameter reduction 12, less dampening solution is guided.
- roller strip of the dampening roller 6 to the printing plate and the dampening roller 4 is set in a defined manner, an uneven deflection of the rubber of the dampening roller 6 is compensated for and thus a parallel roller strip is achieved over the printing plate format 10. Due to the arrangement of the roller lengths 17 in a roller alignment 14, no excess dampening solution can be conveyed to the pressure plate via the end faces of the dampening unit roller train 7. Rather, this roller arrangement allows a dampening solution return flow 18 over the end faces of the dampening duct 4 in the direction of the dampening solution container 3.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
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 true EP0729832A2 (fr) | 1996-09-04 |
EP0729832A3 EP0729832A3 (fr) | 1997-01-02 |
EP0729832B1 EP0729832B1 (fr) | 1998-10-28 |
Family
ID=7755228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96101644A Expired - Lifetime EP0729832B1 (fr) | 1995-02-28 | 1996-02-06 | Dispositif de mouillage pour une machine à imprimer offset |
Country Status (5)
Country | Link |
---|---|
US (1) | US5680815A (fr) |
EP (1) | EP0729832B1 (fr) |
JP (1) | JP2898597B2 (fr) |
AT (1) | ATE172669T1 (fr) |
DE (2) | DE19506923C1 (fr) |
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 |
Citations (6)
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 |
DE1940661A1 (de) * | 1969-08-09 | 1971-02-18 | Roland Offsetmaschf | Feuchteinrichtung fuer lithographische Druckmaschinen |
DE3030076C1 (de) * | 1980-08-08 | 1982-06-16 | Rotaprint Gmbh, 1000 Berlin | Offset-Druckmaschine mit einem Farb- und Feuchtwerk |
DE3620156A1 (de) * | 1985-06-25 | 1987-01-08 | Polygraph Leipzig | Verfahren und einrichtung zur beseitigung von putzen auf der druckplatte |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3448686A (en) * | 1966-12-05 | 1969-06-10 | Miehle Goss Dexter Inc | Form roller setting and control means |
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 |
-
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/fr 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
Patent Citations (6)
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 |
DE1940661A1 (de) * | 1969-08-09 | 1971-02-18 | Roland Offsetmaschf | Feuchteinrichtung fuer lithographische Druckmaschinen |
DE3030076C1 (de) * | 1980-08-08 | 1982-06-16 | Rotaprint Gmbh, 1000 Berlin | Offset-Druckmaschine mit einem Farb- und Feuchtwerk |
DE3620156A1 (de) * | 1985-06-25 | 1987-01-08 | Polygraph Leipzig | Verfahren und einrichtung zur beseitigung von putzen auf der druckplatte |
Also Published As
Publication number | Publication date |
---|---|
ATE172669T1 (de) | 1998-11-15 |
EP0729832A3 (fr) | 1997-01-02 |
JPH08244196A (ja) | 1996-09-24 |
DE59600722D1 (de) | 1998-12-03 |
EP0729832B1 (fr) | 1998-10-28 |
US5680815A (en) | 1997-10-28 |
DE19506923C1 (de) | 1996-06-27 |
JP2898597B2 (ja) | 1999-06-02 |
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