GB2285769A - Printing units for offset rotary printing machines - Google Patents

Printing units for offset rotary printing machines Download PDF

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Publication number
GB2285769A
GB2285769A GB9500950A GB9500950A GB2285769A GB 2285769 A GB2285769 A GB 2285769A GB 9500950 A GB9500950 A GB 9500950A GB 9500950 A GB9500950 A GB 9500950A GB 2285769 A GB2285769 A GB 2285769A
Authority
GB
United Kingdom
Prior art keywords
unit
printing
cylinder
transfer cylinder
inking
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
GB9500950A
Other versions
GB9500950D0 (en
GB2285769B (en
Inventor
Thomas John
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 GB9500950D0 publication Critical patent/GB9500950D0/en
Publication of GB2285769A publication Critical patent/GB2285769A/en
Application granted granted Critical
Publication of GB2285769B publication Critical patent/GB2285769B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • 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

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

Description

2285769 1- Printing units for offset rotary printing machines The
invention relates to printing units for use in offset rotary printing machines, having a forme cylinder, a transfer cylinder, an inking unit and a dampening unit.
In inking and dampening units of offset rotary printing machines a greater or lesser number of rollers is necessary for transporting the ink or the dampening agent from the dosing device to the printing forme. An inking and dampening unit of this type is shown, for instance, in DE 33 08 067 Cl. Even with short inking units at least one inking roller is connected between the screen roller and the forme cylinder (DE 34 42 661 Al).
It is the aim of the invention to reduce the number of rollers in the inking or dampening unit in printing units of the above type.
According to the invention the transfer cylinder is used for the application of the ink or dampening agent, or both. The invention uses the soft property of the transfer cylinder and so when applying ink or dampening agent directly onto it the soft application rollers of the inking or dampening unit can be omitted.
For a better understanding of the invention embodiments of it will be described in detail below wi-h reference to the attached drawings, in which:
Figs. 1 and 2 show printing units with an -:nking unit arranged on the transfer cylinder; and Figs. 3 and 4 show printing units with a dampening unit arranged on the transfer cylinder.
Fig. 1 shows a printing unit 3 of an offset rotary printing machine containing a forme cylinder 1 and a transfer cylinder 2. A dampening unit 4 is arranged on the forme cylinder 1 and an inking unit 5 on the 5 transfer cylinder 2.
The printing unit 3 shown might co-operate, for instance, (not illustrated) with a mirror-symmetrically similar printing unit on the other side of the web 6, using the rubber-rubber principle, to print the web 6. To this end the printing forme on the forme cylinder 1 is dampened by the dampening unit 4, i.e. the nonprinting areas of the plate are wetted with water. This film of water on the non-printing areas is transferred to the transfer forme of the transfer cylinder, for instance a conventional compressible or incompressible rubber blanket. However, in this example and in the embodiment example according to Fig. 2 the surface of the transfer forme preferably has or is given hydrophilic properties. As a result the inking unit 5 set on the transfer cylinder 2 only inks the non-water-carrying areas of the transfer cylinder 2, i.e. the image areas. The image is transferred to the web 6. The inking unit 5 indicated in Fig. 1 is an aniloxLinking unit whose screen roller 7 lies against the transfer cylinder 2. However, the inking unit can instead be placed on the upper side of the transfer cylinder 2.
The invention can also be put into effect in inking units of different construction, as shown in the following Fig. 2, which uses the same numbering for components already shown in Fig. 1, as indeed do the other embodiments of the invention. In Fig. 2 a newsprint inking unit 8 is arranged on the transfer cylinder 2. The whole ink line and the dosing device, for instance a ductor with a wedge-type ink duct, are not shown. The inking rollers, normally two, are absent, and the inking unit with the following hard roller, in this case a non-reciprocating cylinder 9, lies directly against the transfer cylinder 2. The dampening unit 10 comprising three rollers, for instance, is arranged in this embodiment on the upper half of the forme cylinder 1. The method of operation of the printing unit 11 is the same as that of the 10 printing unit 3 in Fig. 1.
In the printing unit 12 according to Fig. 3 the arrangement is reversed so that the inking unit 5 is set against the forme cylinder 1 while the dampening unit 13 is on the transfer cylinder 2. This dampening unit lies against the transfer cylinder 2 via the dampening transfer roller 14 with the dampener roller omitted.
In the printing unit 12 the transfer cylinder 2 is dampened with the dampening unit 13. The transfer cylinder in turn dampens the printing forme of the forme cylinder 1. Hence only the printing areas of the printing forme are inked with the inking unit 5. These ink-carrying printing areas deliver the ink to the transfer cylinder 2 which in turn prints the web 6. Since normally the forme cylinder 1 and the transfer cylinder 2 have the same diameter, the areas of the transfer cylinder wetted with ink are always in 1:1 congruence with the printing areas of the printing f orme.
The printing unit 15 according to Fig. 4 is similar in construction to the printing unit according to Fig. 3, except that the chromium cylinder 17 of the dampening unit 16 is set directly on the transfer cylinder 2 with 4the dampener roller omitted. The method of operation of the printing unit 15 is the same as that of the printing unit 12.
In a further embodiment even the chromium cylinder can be omitted: here the dampening agent can be applied directly to the transfer cylinder with known spraying or centrifuging dampening units.
In printing units according to Figs. 3 and 4, when the inking unit is removed the dampening unit can also be used as a washing device against the build-up of dust on the transfer cylinder 2.
It has already been stated that the inking units in the case of the printing units according to Figs. 1 and 2, and the dampening units in the case of the printing units according to Figs. 3 and 4, can also be arranged after the printing zone, in the direction of rotation of the transfer cylinder. The dosing devices of the inking and dampening units have been described only by way of example since they do not belong to the scope of protection of the patent. The printing forme and/or the transfer forme can be constructed finitely as plates or endlessly in the form of sleeves.

Claims (11)

Claims
1. A printing unit for an offset rotary printing machine, having at least a forme cylinder (1) and a transfer cylinder (2) as well as an inking unit and a dampening unit (4, 10), characterised in that the inking unit (5, 8) is set against the transfer cylinder (2) with the usual inking rollers omitted.
2. A printing unit according to claim 1, in which the surface of the transfer cylinder (2) is hydrophilic.
3. A printing unit according to claim 1 or 2, in which the inking unit is an anilox inking unit whose screen roller (7) lies against the transfer cylinder (2).
4. A printing unit according to any preceding claim, in which the inking unit (5, 8), in the direction of rotation of the transfer cylinder (2), is arranged in front of the forme cylinder (1).
5. A printing unit according to claims 1 to 3, in which the inking unit (5, 8), in the direction of rotation of the transfer cylinder (2), is arranged behind the forme cylinder (1).
6. A printing unit for an offset rotary printing machine having at least a forme cylinder (1) and a transfer cylinder (2) as well as an inking unit (5) and a dampening unit, characterised in that the dampening unit (13, 16) is set against the transfer cylinder (2) with at least the usual dampener roller omitted.
7. A printing unit according to claim 6, In which the dampening unit (16) includes a chromium cylinder (17) by which it lies against the transfer cylinder (2).
8. A printing unit according to claim 6 or 7, in which the dampening unit (13, 16), in the direction of rotation of the transfer cylinder (2), is arranged in front of the forme cylinder (1).
C 1
9. A printing unit according to claim 6 or 7, in which the dampening unit (13, 16), in the direction of rotation of the transfer cylinder (2), is arranged behind the forme cylinder (1).
10. A printing unit for offset printing, having a forme cylinder, a transfer cylinder by which the image is to be applied to the medium, an inking unit and a dampening unit; characterised in that one of the inking and dampening units is arranged to apply its respective medium via the forme cylinder to the transfer cylinder.
11. A printing unit substantially as described herein with reference to any of the embodiments shown in the 20 accompanying drawings.
GB9500950A 1994-01-19 1995-01-18 Printing units for offset rotary printing machines Expired - Fee Related GB2285769B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944401425 DE4401425C2 (en) 1994-01-19 1994-01-19 Printing unit of an offset rotary printing machine

Publications (3)

Publication Number Publication Date
GB9500950D0 GB9500950D0 (en) 1995-03-08
GB2285769A true GB2285769A (en) 1995-07-26
GB2285769B GB2285769B (en) 1997-07-23

Family

ID=6508223

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9500950A Expired - Fee Related GB2285769B (en) 1994-01-19 1995-01-18 Printing units for offset rotary printing machines

Country Status (4)

Country Link
JP (1) JP2746540B2 (en)
DE (1) DE4401425C2 (en)
FR (1) FR2715103B1 (en)
GB (1) GB2285769B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10240378A1 (en) * 2002-09-02 2004-03-11 Heidelberger Druckmaschinen Ag Printing group in double rubbercloth configuration for offset printing press has moistening apparatus with additional application roll
DE10338193B4 (en) * 2002-09-02 2012-02-02 Goss International Montataire S.A. Indenting group in a blanket blanket configuration
DE102006050746A1 (en) * 2006-10-27 2008-04-30 Koenig & Bauer Aktiengesellschaft Short inking device of sheet offset rotary printing machine, contains print form cylinder, where device for applying wetting water on offset cylinder, is arranged in area between printing gap and contact area
US7523704B2 (en) * 2007-01-19 2009-04-28 Julius Domotor Lithographic offset press and lithographic offset press printing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1285817A (en) * 1969-05-27 1972-08-16 Sumitomo Electric Industries Apparatus for marking the surfaces of wires or other elongated articles
US4972771A (en) * 1986-07-12 1990-11-27 Miller-Johannisberg Druckmaschinen Gmbh Film dampener unit for offset printing presses

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD62336A (en) *
GB1138055A (en) * 1966-09-03 1968-12-27 Baker Perkins Ltd Improvements in rotary offset printing units
GB2007156A (en) * 1977-11-05 1979-05-16 Maschf Augsburg Nuernberg Ag Rotary Offset Printing Machine
DE8217918U1 (en) * 1982-06-23 1983-03-24 Basf Farben + Fasern Ag, 2000 Hamburg FLAT PRINTING MACHINE
DE8301378U1 (en) * 1983-01-20 1984-10-25 M.A.N.- Roland Druckmaschinen Ag, 6050 Offenbach, De ROTARY PRINTING MACHINE FOR INDIRECT PRINTING WITH A REDUCED TRANSFER CYLINDER
DE3428073A1 (en) * 1984-07-30 1986-01-30 Bertold Dipl.-Ing. 5503 Konz Hein Short inking unit with toothed doctor for letter press and litho printing
DE3442661A1 (en) * 1984-11-23 1986-06-05 Albert-Frankenthal Ag, 6710 Frankenthal INK
DE9210643U1 (en) * 1992-08-08 1992-11-05 Man Roland Druckmaschinen Ag, 6050 Offenbach, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1285817A (en) * 1969-05-27 1972-08-16 Sumitomo Electric Industries Apparatus for marking the surfaces of wires or other elongated articles
US4972771A (en) * 1986-07-12 1990-11-27 Miller-Johannisberg Druckmaschinen Gmbh Film dampener unit for offset printing presses

Also Published As

Publication number Publication date
JP2746540B2 (en) 1998-05-06
GB9500950D0 (en) 1995-03-08
DE4401425C2 (en) 1996-04-11
DE4401425A1 (en) 1995-07-20
FR2715103B1 (en) 1999-01-22
GB2285769B (en) 1997-07-23
FR2715103A1 (en) 1995-07-21
JPH07205391A (en) 1995-08-08

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20000118