EP0324118B1 - Druckwerk für Rotationsdruckmaschinen - Google Patents

Druckwerk für Rotationsdruckmaschinen Download PDF

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Publication number
EP0324118B1
EP0324118B1 EP88120753A EP88120753A EP0324118B1 EP 0324118 B1 EP0324118 B1 EP 0324118B1 EP 88120753 A EP88120753 A EP 88120753A EP 88120753 A EP88120753 A EP 88120753A EP 0324118 B1 EP0324118 B1 EP 0324118B1
Authority
EP
European Patent Office
Prior art keywords
ink
cylinder
unit
roller
printing
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
Application number
EP88120753A
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German (de)
English (en)
French (fr)
Other versions
EP0324118A3 (en
EP0324118A2 (de
Inventor
Norbert Dr. Thünker
Norbert Dr. Freyer
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger 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
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0324118A2 publication Critical patent/EP0324118A2/de
Publication of EP0324118A3 publication Critical patent/EP0324118A3/de
Application granted granted Critical
Publication of EP0324118B1 publication Critical patent/EP0324118B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/06—Cleaning arrangements or devices for offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/20—Ink-removing or collecting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/22—Rollers

Definitions

  • the invention relates to a printing unit for rotary printing presses with at least one inking unit, at least one ink-guiding cylinder, such as Plate cylinder and blanket cylinder, and with at least one paper-guiding cylinder, e.g. the printing cylinder, with at least one of the ink-carrying cylinders being adjustably mounted.
  • the setting of the production status within the printing unit requires two conditions to be met: in the inking unit, the color profile and in the entire printing unit, the ink / fountain solution emulsion must have assumed the stationary state appropriate for the printing unit. This is referred to as equilibrium in the following. With high-pressure or dry offset processes that do not require the addition of dampening solution, the problem of ink / dampening solution equilibrium is eliminated.
  • the problems described in the rest of the text which result from the color profile setting for offset printing, can be applied to both portrait and dry offset printing without exception.
  • PS 33 38 143 describes a possible method in which first a defined one Basic ink layer thickness is generated on all inking rollers. In a second step, the color profile is applied. Once the color profile has been set up, the dampening unit and pressure plate are pre-moistened. The blanket cylinder is switched off from the plate cylinder and impression cylinder. Then the inking rollers are placed on the plate cylinder. To avoid a build-up of ink on the printing plate, you must start printing immediately afterwards.
  • a disadvantage of the process described in DE-PS 33 38 143 is that an empty inking unit must always be assumed, and that the color profile and the ink / fountain solution emulsion which have been adapted to the printing process have not yet been set at the start of printing.
  • the ink / fountain solution flow within the printing unit which is required for the steady state of production, is only achieved by removing a larger amount of ink from the blanket cylinder by means of paper. So-called waste sheets are created.
  • the problem of waste generation due to the not yet stable ink / fountain solution balance in offset printing does not only occur at the start of printing or profile changes. Printing interruptions often occur in production. These can be predictable, such as the interruptions for blanket washing, which must take place approximately every 3000 prints.
  • Each of these printing interruptions disturbs the sensitive ink / fountain solution balance, in that the ink and fountain solution partially separate from one another within the printing unit and the printing properties of the emulsion change. If printing is to be continued after the print interruption, the printing emulsion of the color emulsion is therefore generally no longer available.
  • the ink and dampening solution application rollers are automatically switched off from the plate cylinder and the blanket cylinder is separated from the printing cylinder and the plate cylinder. Since the inking unit continues to work, ink is also transported in the direction of the plate cylinder, which leads to an evening of the color profile within the inking unit and also changes the ink / fountain solution emulsion. Before a new start of printing, the color profile and the ink / fountain solution emulsion must be built up again.
  • the ink gap thicknesses on the duct roller are changed by readjusting the dosing elements.
  • a defined ink layer thickness and the required ink / fountain solution emulsion must have been set on all rollers within the inking unit.
  • waste paper is printed in conventional printing units until the necessary balance has been restored.
  • the object of the invention is to get by almost without printing waste when setting the print-ready state.
  • This object is achieved according to the invention in a genus, as set out above, in that one or more ink-guiding cylinders can be switched on or off
  • Color reduction unit is assigned that the color reduction unit consists of one or more adjacent rollers, a squeegee and an ink collecting trough, that a roller of the color reduction unit when printing is stopped, but with continued ink and dampening solution supply and ink and dampening unit employed on the plate cylinder, each at the ink leader Cylinder is applied, whereby the color reduction unit removes the same or approximately the same part of the ink and dampening solution film from the ink-carrying cylinder, which would otherwise be removed from the paper.
  • the waste output can be reduced from the current 150-200 prints at the start of printing or major profile changes to 2-3 sheets of waste per print interruption.
  • An advantageous development of the invention consists in that the roller attached to the blanket cylinder or the plate cylinder is driven by frictional engagement from the blanket cylinder or the plate cylinder. This makes it possible to do without a separate roller drive.
  • a rigid roll surface has several advantages. It has the positive property of having a high wear resistance compared to the doctor blade. This enables the design of a simple spring steel knife as a doctor blade, the use of which results in a clean doctoring of the roller surface. In addition, the The heat generated by scraping, which otherwise flows into the printing unit and disturbs the ink / fountain solution balance, is negligible. Chromium oxide or aluminum oxide can preferably be used as the material for the roller surface. If a resilient material, such as rubber, is used for a roller that is attached to the plate cylinder, this results in protection of the printing plate against wear.
  • a roller of the ink reduction unit can be driven separately, it can be operated in such a way that it cleans itself when cleaning solution is brought onto the rotatably mounted roller.
  • the color reduction unit can also be used as a cylinder washing device.
  • Fig. 1 shows the structure of the printing unit according to the invention.
  • the plate cylinder 1 is supplied with ink and dampening solution by the inking unit 2 and the dampening unit 3.
  • the blanket cylinder 4 is located on the plate cylinder 1 and bears either on the printing cylinder 5 or on the roller 6.
  • the roller 6, which is driven by friction from the blanket cylinder 4, is part of the ink reduction unit 7a, which also includes a doctor blade 8, which carries out a traversing movement, and a removable ink collecting tray 9.
  • the system may also include a solvent feeder 10. This applies solvent to the surface area of the roller 6, which, viewed in the direction of rotation of the roller, lies between the blanket cylinder 4 and the doctor blade 8. This makes it easier to scrape off the ink from the roller 6.
  • a brush 11 can also be provided in order to remove any remaining ink from the roller. This brush rotates either counter to the roller 6 or in the same direction of rotation at a different speed. In order to avoid squeegee marks, the squeegee executes a traversing movement.
  • the color profile presetting within the inking unit follows first. The inking rollers 12 to 15 are switched off from the plate cylinder 1. Then the dampening unit 3 and plate cylinder 1 are pre-moistened.
  • the dampening solution application rollers 16 and 17 are placed on the plate cylinder 1.
  • the inking rollers 12 to 15 for printing plate inking are also placed on the plate cylinder 1.
  • the solvent supply is started and the blanket cylinder 4 is placed on the plate cylinder 1 and on the roller 6. From this the ink and dampening solution portion, which would otherwise be transferred onto the paper, are scraped off until the color profile and a stable ink / dampening solution balance have been established.
  • the blanket cylinder 4 is placed against the impression cylinder 5 and the sheet feed is started.
  • the solvent supply to the roller 6 is stopped.
  • the paper supply is stopped and the blanket cylinder 4 is switched off by the printing cylinder 5 and placed on the roller 6 .
  • the color reduction unit 7a works until the Production status has been set both in the color profile and in the ink / fountain solution balance.
  • the blanket cylinder 4 is set down by the roller 6 and placed on the impression cylinder 5. At the same time, the paper feed is started again.
  • the print-ready state is reached when the machine is started after a long pause in printing, for example overnight, after about two hundred machine revolutions.
  • the number of revolutions after the machine has started can be evaluated here as a relevant machine parameter for evaluating the setting of the production pressure status.
  • the number of machine revolutions required after the standstill is highly dependent on the subject, the zone-wide ink gap thicknesses on the duct roller and the downtime. These parameters can be used to determine a defined, necessary number of machine revolutions for setting the production pressure status. If a counter has counted these defined machine revolutions, there is a signal to the actuating device of the color reduction unit 7a, and the blanket cylinder 4 is turned off by the roller 6 and set against the printing cylinder 5.
  • the sheet feed is started and the solvent feed is interrupted.
  • the setting of the production pressure status can also be checked by means of a measuring system which then gives the signal for deactivating the color reduction unit.
  • the roller 6 can be designed such that it has the same circumference as the blanket cylinder 4.
  • the scraped-off ink which collects in the removable ink collecting trough 9, can be fed back manually or by a pump device, if necessary after cleaning, to the ink fountain (not shown in the figure for reasons of clarity).
  • Fig. 2 shows another embodiment of the printing unit according to the invention. If the printing unit is in an out-of-print condition, either after a new start of printing or after a stop, the roller 18 of the ink reduction unit 7b is placed against the plate cylinder 1 and the solvent supply is started. The blanket cylinder 4 is switched off from the plate cylinder 1 and the impression cylinder 5. The roller 18 has a resilient surface, while the roller 19 is provided with an inflexible surface. The ink passes from the plate cylinder 1 by splitting to the roller 18 and from there again by splitting to the roller 19, from where it is scraped off. Here, too, it is possible to have the doctor blade 8 perform a traversing movement in order to avoid doctor blade traces.
  • the ink removal from the roller 19 can also be supported here by a solvent supply device 10, which in this case is designed as a spray device. Since the ink reduction unit is attached to the plate cylinder here, a complete doctoring off of the ink is not so important, since the plate is offered ink everywhere by the inking unit.
  • the roller 18 When the production-ready state has been reached, the roller 18 is turned off from the plate cylinder 1, the blanket cylinder 4 is placed against the plate cylinder 1 and the printing cylinder 5, and sheet feeding is started.
  • the color reducer 7b automatically cleans itself by maintaining the rotation of the rollers 18 and 19 and the solvent supply for some time. When cleaning is complete, the solvent supply is stopped and the roller rotation is interrupted.
  • the printing cylinder 5 is used as the roller of the color reduction unit 7c operated from which the paint is doctored off.
  • a drip strip serves as the solvent supply device 10.
  • the doctor blade 8 is placed against the printing cylinder and the solvent supply is started. If the color profile within the inking unit 2 is stable and the ink / fountain solution equilibrium has been established, the solvent supply is interrupted, the doctor blade 8 is switched off by the printing cylinder 5 and the sheet supply is started.
  • care must be taken to avoid a collision with the grippers in the cylinder channel. To do this, either the squeegee movement or the movement of the grippers can be modified. A falling doctor blade 8 into the cylinder channel can be avoided by a suitable doctor guide.
  • the ink reduction unit 7d here consists of the roller 20, the doctor blade 8 and the ink collecting trough 9.
  • the mode of operation here is analogous to that described in the previous embodiments.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP88120753A 1988-01-12 1988-12-13 Druckwerk für Rotationsdruckmaschinen Expired - Lifetime EP0324118B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3800570A DE3800570A1 (de) 1988-01-12 1988-01-12 Druckwerk fuer rotationsdruckmaschinen
DE3800570 1988-01-12

Publications (3)

Publication Number Publication Date
EP0324118A2 EP0324118A2 (de) 1989-07-19
EP0324118A3 EP0324118A3 (en) 1989-10-11
EP0324118B1 true EP0324118B1 (de) 1992-03-18

Family

ID=6345088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120753A Expired - Lifetime EP0324118B1 (de) 1988-01-12 1988-12-13 Druckwerk für Rotationsdruckmaschinen

Country Status (7)

Country Link
US (1) US5046416A (zh)
EP (1) EP0324118B1 (zh)
JP (1) JPH072419B2 (zh)
CN (1) CN1017128B (zh)
AU (1) AU612765B2 (zh)
CA (1) CA1325922C (zh)
DE (2) DE3800570A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0453855A1 (de) * 1990-04-27 1991-10-30 Heidelberger Druckmaschinen Aktiengesellschaft Präparation des Farbwerks einer Druckmaschine bei Druckauftragswechsel
DE4424581C1 (de) * 1994-07-13 1995-10-19 Roland Man Druckmasch Vorrichtung zum Entfernen von Farbe aus einem Farbwerk

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4013465A1 (de) * 1990-04-27 1991-10-31 Heidelberger Druckmasch Ag Druckmaschine mit wascheinrichtung
JP2564517Y2 (ja) * 1991-05-24 1998-03-09 株式会社小森コーポレーション 輪転印刷機のインキ洗浄装置
JPH0745245B2 (ja) * 1991-06-28 1995-05-17 株式会社東京機械製作所 平版印刷方法及び平版印刷装置
DE9110345U1 (de) * 1991-08-22 1991-10-10 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Feuchtwerk für Offsetdruckmaschinen
DE4131131C2 (de) * 1991-09-19 1994-07-21 Voith Gmbh J M Vorrichtung zum Auftragen von Streichfarbe auf eine Faserstoffbahn
US5259313A (en) * 1991-12-20 1993-11-09 Heidelberg Harris Gmbh Method and apparatus for cleaning an inking mechanism and/or a printing mechanism in printing units of rotary printing machines
DE4312229C2 (de) * 1993-04-14 1999-10-28 Heidelberger Druckmasch Ag Verfahren zur definierten Erzeugung einer dem Fortdruck nahen Farbverteilung im Farbwerk von Rotationsdruckmaschinen
DE19645799A1 (de) * 1996-11-07 1998-05-20 Roland Man Druckmasch Papierbahnfangvorrichtung
DE19750259B4 (de) * 1997-02-17 2008-09-18 Heidelberger Druckmaschinen Ag Verfahren und Druckmaschine zum mehrfarbigen Bedrucken von nichtsaugendem Material
SE510460C2 (sv) * 1997-09-24 1999-05-25 Grafic Team International Swed Sätt och anordning för rengöring av en gummiklädd cylinder i en offsetpress
DE19807505A1 (de) * 1998-02-21 1999-08-26 Roland Man Druckmasch Bogenrotationsdruckmaschine mit Druckeinheiten für den Mehrfarbendruck und wenigstens einer Beschichtungseinheit
DE60020218T2 (de) 1999-03-03 2006-01-26 Price, James F., Euless Schraubenloses farbwerk für eine druckmaschine
US6895861B2 (en) * 2003-07-11 2005-05-24 James F. Price Keyless inking systems and methods using subtractive and clean-up rollers
US6672211B2 (en) * 1999-03-03 2004-01-06 James F. Price Inking systems for printing presses
EP1524114A2 (de) * 2000-09-20 2005-04-20 Koenig & Bauer Aktiengesellschaft Druckeinheit
DE10303608B4 (de) * 2003-01-30 2008-05-08 Man Roland Druckmaschinen Ag Verfahren für einen stabilen Maschinenlauf an Druckeinheiten einer Rotationsdruckmaschine für den Betrieb mit teilbreitem Bedruckstoff
JP4205971B2 (ja) 2003-02-24 2009-01-07 東京印刷機材トレーディング株式会社 枚葉オフセット両面印刷機における圧胴ジャケット洗浄装置
DE102004033218B4 (de) * 2003-08-27 2015-07-02 Heidelberger Druckmaschinen Ag Verfahren zur Zylinderreinigung in einer Druckmaschine
US20070214981A1 (en) * 2006-03-14 2007-09-20 Heidelberger Druckmaschinen Ag Sheet-fed printing machine
US7675298B2 (en) * 2007-06-15 2010-03-09 Hewlett-Packard Development Company, L.P. Determining fluid characteristics
DE102008032393A1 (de) * 2007-07-27 2009-01-29 Heidelberger Druckmaschinen Ag Fortdruckbeginn bei reduziertem Feuchtmittelauftrag
DE102008001542B4 (de) * 2008-05-05 2010-12-30 Koenig & Bauer Aktiengesellschaft Walzenreinigungsvorrichtung einer Offsetdruckmaschine
JP5203065B2 (ja) * 2008-06-24 2013-06-05 富士フイルム株式会社 液体塗布方法及び画像形成装置
US9616657B2 (en) * 2013-10-01 2017-04-11 Goss International Americas, Inc. Closed loop ink thickness control system with reduced substrate waste in a printing press

Family Cites Families (18)

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Publication number Priority date Publication date Assignee Title
GB869803A (en) * 1957-10-10 1961-06-07 Miehle Goss Dexter Inc Inking arrangements for rotary printing press
US3410206A (en) * 1966-11-28 1968-11-12 Capital Tool And Mfg Co Inc Ink separator
GB1299263A (en) * 1970-02-04 1972-12-13 Gestetner Ltd Printing machine blanket cylinder cleaning device
US3766853A (en) * 1972-04-04 1973-10-23 Dick Co Ab System for cleaning rollers of a duplicating machine, such as ink rollers
DE2243248A1 (de) * 1972-09-02 1974-03-21 Roland Offsetmaschf Farbwerk an bogen verarbeitenden maschinen, insbesondere offsetmaschinen
CH583097A5 (zh) * 1975-05-05 1976-12-31 Wifag Maschf
DE2531886C3 (de) * 1975-07-17 1978-04-13 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Verfahren und Vorrichtung zur Reinigung von Zylindern eines Offsetdruckwerkes
US4270450A (en) * 1979-09-10 1981-06-02 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Arrangement for washing cylinders on printing presses
US4527479A (en) * 1981-07-31 1985-07-09 Dahlgren Harold P Ink removal, circulating and distributing system
JPS58183259A (ja) * 1982-04-22 1983-10-26 Mitsubishi Heavy Ind Ltd 印刷機のインキング装置
DE3326916C2 (de) * 1983-07-26 1985-07-11 Werner J. 8901 Diedorf Kotterer Vorrichtung zur Abnahme eines Farbstreifens
DE3338143C2 (de) * 1983-10-20 1986-12-18 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Verfahren zur Erzeugung einer dem Druckbild entsprechenden Farbschichtstärke im Farbwerk einer Druckmaschine
DE3401886A1 (de) * 1984-01-20 1985-08-01 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Verfahren und vorrichtung zur einfaerbung der platte eines plattenzylinders von rotationsdruckmaschinen
DD236052A1 (de) * 1985-04-12 1986-05-28 Polygraph Leipzig Einrichtung zur reinigung von zylindern und walzen in druckwerken von druckmaschinen
DD236053A1 (de) * 1985-04-12 1986-05-28 Polygraph Leipzig Einrichtung zum aufbringen und dosieren von reinigungsfluessigkeit
DD257990A1 (de) * 1986-04-21 1988-07-06 Polygraph Leipzig Verfahren zum teilweisen entfernen von farbe aus dem farbwerk
DE3614496A1 (de) * 1986-04-29 1987-11-05 Heidelberger Druckmasch Ag Waschvorrichtung fuer druckzylinder von druckmaschinen
DE3707695A1 (de) * 1987-03-11 1988-09-22 Heidelberger Druckmasch Ag Verfahren zur definierten erzeugung einer dem fortdruck nahen farbverteilung im farbwerk von rotationsdruckmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0453855A1 (de) * 1990-04-27 1991-10-30 Heidelberger Druckmaschinen Aktiengesellschaft Präparation des Farbwerks einer Druckmaschine bei Druckauftragswechsel
DE4424581C1 (de) * 1994-07-13 1995-10-19 Roland Man Druckmasch Vorrichtung zum Entfernen von Farbe aus einem Farbwerk
EP0692381A2 (de) 1994-07-13 1996-01-17 MAN Roland Druckmaschinen AG Vorrichtung zum Entfernen von Farbe aus einem Farbwerk

Also Published As

Publication number Publication date
AU612765B2 (en) 1991-07-18
JPH072419B2 (ja) 1995-01-18
US5046416A (en) 1991-09-10
CN1017128B (zh) 1992-06-24
EP0324118A3 (en) 1989-10-11
DE3800570A1 (de) 1989-07-20
DE3800570C2 (zh) 1993-08-05
DE3869375D1 (de) 1992-04-23
CA1325922C (en) 1994-01-11
CN1034165A (zh) 1989-07-26
EP0324118A2 (de) 1989-07-19
JPH01225556A (ja) 1989-09-08
AU2844089A (en) 1989-07-13

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