EP0744289B1 - Verfahren zur Regelung einer Feuchtmittelmenge - Google Patents

Verfahren zur Regelung einer Feuchtmittelmenge Download PDF

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Publication number
EP0744289B1
EP0744289B1 EP96107877A EP96107877A EP0744289B1 EP 0744289 B1 EP0744289 B1 EP 0744289B1 EP 96107877 A EP96107877 A EP 96107877A EP 96107877 A EP96107877 A EP 96107877A EP 0744289 B1 EP0744289 B1 EP 0744289B1
Authority
EP
European Patent Office
Prior art keywords
amount
strip
printing
web
damping solution
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
EP96107877A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0744289A2 (de
EP0744289A3 (de
Inventor
Herbert Josef Zorn
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.)
Koenig and Bauer AG
Original Assignee
Koenig and Bauer AG
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Filing date
Publication date
Application filed by Koenig and Bauer AG filed Critical Koenig and Bauer AG
Publication of EP0744289A2 publication Critical patent/EP0744289A2/de
Publication of EP0744289A3 publication Critical patent/EP0744289A3/de
Application granted granted Critical
Publication of EP0744289B1 publication Critical patent/EP0744289B1/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
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening

Definitions

  • the invention relates to a method for controlling a Quantity of dampening solution on a printing plate Web-fed rotary printing press according to the preamble of Claim 1.
  • EP 03 88 697 A2 describes a method for Determination of a measuring location for the determination of a Quantity of dampening solution on a printing plate.
  • DE 43 28 864 A1 shows a device for detection the smear limit in offset printing of a printing press, with one outside of a subject of a printing form color-free surface zone on the printing form is trained. This surface zone is by means of of an optical sensor monitored for color guidance.
  • a disadvantage of this device is that the most Plate cylinder arranged a device Accessibility to a printing unit is restricted and each plate cylinder has its own device is.
  • EP 03 57 987 B1 describes a method for Monitoring and control of dampening solution management in an offset printing machine described in which a Measuring range scanned by an optical sensor becomes. This measuring range includes a higher measuring field Area coverage and one - seen in the printing direction - immediately following, in itself color-free Area.
  • the disadvantage here is that there is no reference value is the change in the reflective properties of a sheet to be evaluated.
  • a big disadvantage is that either an additional pressure control element what limits the usable area of a cylinder circumference, must also be printed or with each new one Print job in the printing form of the measuring range new must be determined.
  • the invention has for its object a method to regulate the amount of dampening solution on a Printing plate of a web-fed rotary printing press create with which, regardless of a subject Pressure plate and without the pressure plate by means of detectors to scan and without a usable pressure range Cylinder circumference through pressure control elements restrict the regulation of the amount of dampening solution he follows.
  • the measuring location for determining a tone boundary is fixed in relation to the cylinder and is independent of a subject of a printing plate. Complex devices and methods for determining this measuring location are not necessary.
  • a measuring bar By evaluating a strip located on a web, a measuring bar can largely be arranged anywhere in the region of a web guide according to the printing units to be controlled and is therefore freely accessible. This measuring bar is less exposed to dirt than pressure plate-scanning measuring heads and the accessibility to the cylinders is preserved. No pressure control elements are necessary, since the evaluation takes place in an image-free strip, which means that the web can be optimally used for the finished product, ie there are no unusable areas as a result of the additionally printed pressure control elements.
  • Changes in the properties of the web can be compensated for by reference measurements on the web. It is advantageous that by means of monitoring the entire width of the web with a large number of detectors, only narrow toning areas are recognized. Such toning zones, which run in the circumferential direction of the plate cylinder, occur in particular in spray dampening systems when individual spray nozzles fail. A uniform regulation of the amount of dampening solution over the width of the web can also be achieved by changing the spray quantity of the individual spray nozzles.
  • a web 1 is by means of printing units 2, in example shown four printing units 2, in the Schön and Back printing in a web-fed rotary printing press, especially a newspaper printing press.
  • Each this printing units 2 is in bridge construction symmetrical to lane 1.
  • In side frames of these printing units 2 are two rubber cylinders 4, two plate cylinders 6 and the associated color or Dampening units 7, 8 stored.
  • the inking units 7 are in present example as anilox short inking units, each consisting of an ink transfer roller 9, one Anilox roller 11 and a doctor blade device 12, executed.
  • the dampening units 8 are, for example, as Spray dampers trained and exist in essentially of three dampening solution transfer rollers 13, 14, 16 and one cooperating with them Spray device 17.
  • This measuring bar 19 is at least one Lighting device 21 and close to each other arranged detectors 22, z. B. photodiodes provided.
  • Lighting device 21 from outside the Measuring bar 19 arranged light source 23, which means a variety of light guides 24 light in a itself Cylindrical lens 26 extending parallel to the measuring beam 19 transmits.
  • This cylindrical lens 26 focuses that of the Light guides 24 outgoing light to a cross to the web 1 running light line. It is also possible on the Measuring beam 19 to arrange additional light guides 24 and these with detectors 22 arranged at any point connect.
  • the lighting device 21 illuminates the Lane 1 continuously and the detectors 22 received light remitted by path 1 to by one Trigger signal specified times.
  • Each printing unit 2 can also have its own measuring bar 19 be assigned.
  • the detectors 22 are equipped with an evaluation circuit 27 connected, which in turn with a computer 28 in Connection is established.
  • the computer 28 is on the input side the rotary encoder 18 and the output side with the Dampening units 8 connected.
  • the web 1 is transverse, for example, with four type areas 32, i.e. with four picture or text fields, printed. In the running direction of web 1 is between two on top of each other following type area 32 each transverse to web 1, unprinted parallel to the cylinders 4, 6 Strip 33.
  • An unprinted strip 36 with one Width b36 e.g. B.
  • b36 9 mm
  • the channel of the plate cylinder 6 and the Type area 32 thus limit the pressure-free, narrow strips 36, 37.
  • These unprinted strips 36, 37 lie in areas of one from lane 1 manufactured product, e.g. B. a newspaper in which a Fold runs or punctures are recorded.
  • This Strips 36, 37 can be seen in the finished product and are for each product, for example, as Edges present.
  • the one to be applied to the corresponding pressure plate The amount of dampening solution is regulated as follows:
  • the angular position of the cylinders 4, 6 is determined in the computer 28 by means of the rotary pulse generator 18 and thus a reference is made to the pressure-free strip 33 between the successive type area 32.
  • the computer 28 thus determines a first trigger signal and triggers a measurement in the pressure-free strip 34 as a result of the channel of the plate cylinder 6.
  • This strip 34 is always free of printing ink, since no printing ink can be transferred here due to the channel.
  • This strip 34 can thus be used to determine a reference measurement.
  • This reference measurement enables reliable measurement results even in the event of color tolerances of a base color or contamination of the web 1. This reference measurement can be carried out at every cylinder revolution or at specific intervals.
  • a second measurement is carried out in one of the two pressure-free strips 36, 37, preferably in the strip 36 at the beginning of the pressure, by means of a second trigger signal.
  • both pressure-free strips 36, 37 can also be measured one after the other.
  • the running web 1 is continuously illuminated by the lighting device 21 and the light radiation remitted by the strips 34, 36, 37 of the web 1 is detected by the detectors 22 at times determined by the trigger signals.
  • This remitted light radiation is broken down into individual spectral ranges associated with certain printing inks used. This can be done by means of a filter, a filter with a detector 22 being assigned to each spectral region typical of a printing ink.
  • a printing ink is then assigned to these spectral ranges, whereby the corresponding printing unit 2 to be readjusted is defined.
  • the measurement of the pressure-free strip 36 in front of the type area 32 is compared with the reference measurement in the computer 28. If there are traces of one or more printing inks in the strip 36 in front of the type area 32, the amount of dampening solution is increased in the printing units 2 corresponding to these. This can be done in discrete steps of equal size, but the amount of dampening solution can also be increased depending on the amount of printing ink present in the measuring range. This amount of the printing ink present on the web 1 in the measuring range influences an intensity of the light radiation remitted by the web 1.
  • the so-called tone limit is used as a criterion for an optimal amount of dampening solution.
  • the tone boundary is generally the state of a printing process in which first particles of printing ink are deposited in the non-image areas of the printing plate or web 1.
  • This tonal limit can be measured by measuring that the remitted light radiation differs only slightly from the light radiation of the unprinted web 1, ie the reference measurement.
  • the amount of dampening solution supplied is increased by a small defined amount, for example 5% to 10%, so that an optimal amount of dampening solution is achieved a little above the tone limit. After each change in the amount of dampening solution is only after a certain reaction time, for. B.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
EP96107877A 1995-05-20 1996-05-17 Verfahren zur Regelung einer Feuchtmittelmenge Expired - Lifetime EP0744289B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19518660A DE19518660C2 (de) 1995-05-20 1995-05-20 Verfahren zur Einstellung einer Feuchtmittelmenge
DE19518660 1995-05-20

Publications (3)

Publication Number Publication Date
EP0744289A2 EP0744289A2 (de) 1996-11-27
EP0744289A3 EP0744289A3 (de) 1996-12-11
EP0744289B1 true EP0744289B1 (de) 1999-03-17

Family

ID=7762507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96107877A Expired - Lifetime EP0744289B1 (de) 1995-05-20 1996-05-17 Verfahren zur Regelung einer Feuchtmittelmenge

Country Status (4)

Country Link
US (1) US5713286A (ja)
EP (1) EP0744289B1 (ja)
JP (1) JP2801582B2 (ja)
DE (2) DE19518660C2 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1295080C (zh) * 2004-03-25 2007-01-17 南昌印钞厂 印刷机信息采集与传输装置

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19911180C2 (de) * 1999-03-12 2001-02-01 Koenig & Bauer Ag Druckwerk für eine Rotationsdruckmaschine
AUPQ611200A0 (en) * 2000-03-09 2000-03-30 Commonwealth Scientific And Industrial Research Organisation Determination of change in thickness of dampening solution on offset printing rollers
JP2003334930A (ja) * 2002-05-21 2003-11-25 Dainippon Screen Mfg Co Ltd 印刷機における湿し水の供給方法および印刷機
JP4047068B2 (ja) * 2002-05-21 2008-02-13 大日本スクリーン製造株式会社 印刷機
JP4646541B2 (ja) * 2003-05-15 2011-03-09 大日本スクリーン製造株式会社 オフセット印刷機における湿し水の供給量制御方法
JP4638685B2 (ja) * 2003-06-10 2011-02-23 ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフト オフセット印刷機による印刷の際に湿し水を調量する方法
US6796227B1 (en) * 2003-08-18 2004-09-28 Quad Tech Lithographic press dampening control system
DE102005018821B4 (de) * 2005-04-22 2017-09-21 manroland sheetfed GmbH Druckwerk einer Druckmaschine
DE102006030290B3 (de) * 2006-03-03 2007-10-18 Koenig & Bauer Aktiengesellschaft Druckwerk
DE102008041427B4 (de) * 2008-08-21 2013-09-19 Koenig & Bauer Aktiengesellschaft Verfahren zur automatischen Farbregelung in einem laufenden Druckprozess innerhalb einer Druckmaschine
DE102017216260A1 (de) * 2017-09-14 2019-03-14 Heidelberger Druckmaschinen Ag Bildinspektion von Druckerzeugnissen mit Fehlerklassen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1438634A (en) * 1972-09-12 1976-06-09 Vickers Ltd Printing
DE3830732C2 (de) * 1988-09-09 2000-05-25 Heidelberger Druckmasch Ag Verfahren zur Feuchtmittelführung bei einer Offset-Druckmaschine
DE4028083A1 (de) * 1989-03-09 1992-03-12 Heidelberger Druckmasch Ag Verfahren zur feuchteregelung bei einer offsetdruckmaschine
US5520113A (en) * 1989-03-09 1996-05-28 Heidelberger Druckmaschinen Ag Method of regulating dampening medium
DE3909401C2 (de) * 1989-03-22 1994-02-10 Heidelberger Druckmasch Ag Verfahren zur Festlegung eines Meßortes für die Feuchtmittel-Schichtdickenbestimmung einer Offset-Druckplatte
DE4005558A1 (de) * 1990-02-22 1991-09-19 Roland Man Druckmasch Verfahren zur prozessdiagnose einer rotationsdruckmaschine anhand von remissionen von vollton- und rastertonfeldern
DE4214139C2 (de) * 1992-04-29 2002-01-10 Heidelberger Druckmasch Ag Verfahren zur Feuchtmittelregulierung beim Drucken von einem Formzylinder in einer Offsetdruckmaschine
DE4238557A1 (de) * 1992-11-14 1994-05-19 Koenig & Bauer Ag Verfahren zur Einstellung der Feuchtmittelmenge bei einer Offset-Rotationsdruckmaschine
DE4328864A1 (de) * 1993-08-27 1995-03-02 Heidelberger Druckmasch Ag Verfahren und Vorrichtung zur Erkennung der Schmiergrenze beim Offsetdruck

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1295080C (zh) * 2004-03-25 2007-01-17 南昌印钞厂 印刷机信息采集与传输装置

Also Published As

Publication number Publication date
DE19518660A1 (de) 1996-11-21
EP0744289A2 (de) 1996-11-27
JPH091784A (ja) 1997-01-07
US5713286A (en) 1998-02-03
DE59601439D1 (de) 1999-04-22
EP0744289A3 (de) 1996-12-11
JP2801582B2 (ja) 1998-09-21
DE19518660C2 (de) 1997-10-09

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