EP0668824A1 - Verfahren zur beeinflussung der farbdichte eines druckfarbeauftrages auf einem druckträger. - Google Patents
Verfahren zur beeinflussung der farbdichte eines druckfarbeauftrages auf einem druckträger.Info
- Publication number
- EP0668824A1 EP0668824A1 EP93924518A EP93924518A EP0668824A1 EP 0668824 A1 EP0668824 A1 EP 0668824A1 EP 93924518 A EP93924518 A EP 93924518A EP 93924518 A EP93924518 A EP 93924518A EP 0668824 A1 EP0668824 A1 EP 0668824A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- colorimetric
- color density
- color
- deviations
- microprocessor
- 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
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000007639 printing Methods 0.000 title claims description 12
- 230000003287 optical effect Effects 0.000 title abstract 2
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000004737 colorimetric analysis Methods 0.000 claims 1
- 239000003086 colorant Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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 changing the color density of a printing ink job on a printing medium according to the preamble of claim 1.
- a disadvantage of the method is that signals for changing the amount of dampening solution are only triggered when toning occurs on a full-tone surface of the measuring field. The consequence of this is that the copies printed until the printed control sheet is removed are already of reduced quality.
- the invention has for its object to provide a method for evaluating color density fluctuations of an offset rotary printing press. According to the invention, this object is achieved by the features of patent claim 1.
- the solution according to the invention results in particular in the following advantages.
- the ink density values can be kept constant or these ink density values can be evaluated in a downstream logic, as a result of which the amount of dampening solution can be regulated continuously.
- a signal to change the amount of dampening solution is generated before the tone limit is reached, so that quality defects in printing are avoided for these reasons.
- the operating personnel or the automatic ink density control in the event of ink density changes can be given an indication or a signal as to whether and in which direction the amount of dampening solution or the amount of ink must be changed in order to achieve a desired ink density again.
- the method therefore makes it easier to determine the causes of changes in the color density of a color on a print carrier.
- Fig. 1 is a block diagram of the device arrangement
- Fig. 2 shows a process flow chart.
- the color density of an ink job on a print carrier 1, - z. B. a printed sheet, extending transversely to the direction of the printing medium 1 z. B. color control strips with a plurality of measuring fields (measuring spots with a standardized measuring surface) z. B. measured using a densitometer or colorimetric • measuring device 2.
- suitable measuring spots from the subject can also be printed across the direction of rotation of the print carrier 1.
- the color density or colorimetric measured value 3 is a microprocessor 4, z. B.
- the amount of dampening solution is changed as a result of an increase or decrease in a rotational speed of the dampening duct (not shown) driven by a motor 8.
- the speed of a motor 8 z. B. a DC motor, a speed sensor 9 is detected, and its Measured values are supplied to the microprocessor 4 as the actual value.
- a start signal e.g. B. on the input keyboard of the microprocessor 4.
- the input device 6 is entered by the operator in a second method step 22.
- Such input devices 6 can, in addition to the above. also the number of adjacent zones Z, the color density change of which is to be evaluated simultaneously, e.g. B. 11 adjacent zones of one of several colors; the time constant ⁇ for the machine settling time, e.g. 50 sheets; the multiplier x for the time constant ⁇ __. B. 4.
- the aforementioned, selectable input devices 6 can, however, also be temporarily stored in the microprocessor 4.
- the microprocessor 4 is subsequently fed and stored by the densitometer 3 of a print carrier 1 to be tested in a third process step 23.
- the third method step 23 can run simultaneously with the previously described method step 22.
- Such measured values are the number of printed sheets T since the last color moisture change; the number of zones lying next to one another with changed color density or colorimetric value ANZ; a zonal density change Delta D.
- a further method step 24 checked the number of sheets during the period T after the last change in color moisture.
- the process is completed. Otherwise, usually after 200 sheets, it is determined in a next method step 26 whether the number of preselected, adjacent zones AZ of a color is less than or equal to the number ANZ of the adjacent, measured zones with a changed color density or colorimetric value. In this case there is no reason to continue the procedure. If the color density value in method step 26 has only changed in a few adjacent zones or only in one zone, the logical conclusion that no moisture difference is present is derived from this, provided that no zonal dampening unit is present. In this case, the procedure is completed.
- a color density or colorimetric value change delta D is brought about in the type that either the speed n of the dampening roller motor 8 and thus the speed of the dampening ductor is increased in a process step 28 if the color density or colorimetric value is too high, or in a step 29 if the color density or colorimetric value is too low Speed of the dampening motor 8 and thus the speed of the damping duct is reduced, for. B.
- This method is also suitable both for the control of zonal dampening units and for the correction of the moisture in measuring systems which operate according to the colorimetric principle and are therefore no longer tied to a measuring field. In this case, the entire number of zones of all colors used for comparison must then be used ensure that no color or moisture has been adjusted.
- printing material for the purposes of this invention are not only paper sheets and sheets to "see, but also blankets and clamped printing plates with an ink order.
- the method according to the invention is a method for influencing the color density or the colorimetric values of an ink application on a printing medium.
- the color density or the colorimetric value of a plurality of color and position-defined measuring spots is measured on a printed, that is to say having a color application, print carrier.
- Magenta is the color density or the colorimetric value for each selected measurement spot of an ink job on a print carrier for a plurality of position-defined, selected measurement spots.
- color density or colorimetric values stored as setpoint values which can be measured on a print carrier designated as good, but which also originate as pure measured values from completed print jobs, can be supplied as setpoints to a microprocessor and stored there. For each of the color density or colorimetric values there is an indication of its target position on a print carrier and the permissible color density or colorimetric value with or without a permissible tolerance. The color density or the colorimetric values of the selected, position-defined measuring spots are then measured and stored on a support to be checked for printing ink.
- an electronic signal is generated by the microprocessor and an output device is passed on. There, this signal can be used to display ads for to generate an operator with the instruction to correspondingly increase or decrease the amount of dampening solution in accordance with the color density or the colorimetric deviations in the plus or minus direction.
- This electronic signal but also a control of a drive can be supplied for a dampening agent supply means in order to then let the ⁇ electric motor drive of the quantity of dampening medium device to run faster or slower.
- this electronic signal can also be used to emit a second signal that gives the operator, like an ink quantity feed device, the command not to change the ink quantity feed.
- the microprocessor If none of the rows described above are identified, the microprocessor generates a command to change the amount of printing ink accordingly.
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Rotary Presses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4238557 | 1992-11-14 | ||
DE4238557A DE4238557A1 (de) | 1992-11-14 | 1992-11-14 | Verfahren zur Einstellung der Feuchtmittelmenge bei einer Offset-Rotationsdruckmaschine |
PCT/DE1993/001083 WO1994011192A1 (de) | 1992-11-14 | 1993-11-12 | Verfahren zur beeinflussung der farbdichte eines druckfarbeauftrages auf einem druckträger |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0668824A1 true EP0668824A1 (de) | 1995-08-30 |
EP0668824B1 EP0668824B1 (de) | 1997-02-19 |
Family
ID=6472940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93924518A Expired - Lifetime EP0668824B1 (de) | 1992-11-14 | 1993-11-12 | Verfahren zur beeinflussung der farbdichte eines druckfarbeauftrages auf einem druckträger |
Country Status (5)
Country | Link |
---|---|
US (1) | US5568769A (de) |
EP (1) | EP0668824B1 (de) |
JP (1) | JP2793718B2 (de) |
DE (3) | DE4238557A1 (de) |
WO (1) | WO1994011192A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6450097B1 (en) | 1999-04-08 | 2002-09-17 | Heidelberger Druckmaschinen Ag | Method of regulating inking when printing with a printing machine |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19518660C2 (de) * | 1995-05-20 | 1997-10-09 | Koenig & Bauer Albert Ag | Verfahren zur Einstellung einer Feuchtmittelmenge |
DE19546260C1 (de) * | 1995-12-12 | 1996-11-21 | Weitmann & Konrad Fa | Verfahren zur Überwachung der Sprühmenge einer zur Befeuchtung bewegter Materialbahnen in die Breite versprühten Flüssigkeit über deren Breite, Vorrichtung zur Durchführung des Verfahrens, sowie Verwendung der Vorrichtung |
DE19643354A1 (de) * | 1996-10-21 | 1998-04-23 | Heidelberger Druckmasch Ag | Verfahren zum Befeuchten einer Druckform für den Offsetdruck |
US5791249A (en) * | 1997-03-27 | 1998-08-11 | Quad/Tech, Inc. | System and method for regulating dampening fluid in a printing press |
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 |
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 |
DE102008041427B4 (de) * | 2008-08-21 | 2013-09-19 | Koenig & Bauer Aktiengesellschaft | Verfahren zur automatischen Farbregelung in einem laufenden Druckprozess innerhalb einer Druckmaschine |
DE102010034350A1 (de) * | 2010-08-14 | 2012-02-16 | Manroland Ag | Einrichtung zur Regelung des Feuchtmittelauftrags und Farbauftrags in einer Druckmaschine |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD156239A1 (de) * | 1981-01-07 | 1982-08-11 | Eva Luebbe | Verfahren zur korrektur von abweichungen der einfaerbung und feuchtung an offsetdruckmaschinen |
DE3444892C2 (de) * | 1984-12-08 | 1986-11-13 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Feuchtmitteldosiervorrichtung für das Feuchtwerk einer Druckmaschine |
US4972774A (en) * | 1985-04-29 | 1990-11-27 | Baldwin Technology Corporation | Automatically controlling water feedrate on a lithographic press |
DD253679A1 (de) * | 1986-11-13 | 1988-01-27 | Polygraph Leipzig | Verfahren zum regeln der farbdichte |
DE3830732C2 (de) * | 1988-09-09 | 2000-05-25 | Heidelberger Druckmasch Ag | Verfahren zur Feuchtmittelführung bei einer Offset-Druckmaschine |
DE3907584A1 (de) * | 1989-03-09 | 1990-09-13 | Heidelberger Druckmasch Ag | Verfahren zur feuchteregelung bei einer offsetdruckmaschine |
DE3912811A1 (de) * | 1989-04-19 | 1990-10-25 | Heidelberger Druckmasch Ag | Verfahren und vorrichtung fuer die feuchtmittelfuehrung einer offset-druckmaschine |
ATE123443T1 (de) * | 1990-02-22 | 1995-06-15 | Komori Printing Mach | Apparat zur untersuchung von drucksachen und entsprechendes verfahren. |
DE59208787D1 (de) * | 1991-03-21 | 1997-09-18 | Wifag Maschf | Verfahren zur Einstellung der Rasterpunktgrössen für eine Offset-Rotationsdruckmaschine |
-
1992
- 1992-11-14 DE DE4238557A patent/DE4238557A1/de active Pending
-
1993
- 1993-11-12 DE DE4395722T patent/DE4395722D2/de not_active Expired - Fee Related
- 1993-11-12 EP EP93924518A patent/EP0668824B1/de not_active Expired - Lifetime
- 1993-11-12 JP JP6511595A patent/JP2793718B2/ja not_active Expired - Fee Related
- 1993-11-12 DE DE59305502T patent/DE59305502D1/de not_active Expired - Fee Related
- 1993-11-12 US US08/424,468 patent/US5568769A/en not_active Expired - Fee Related
- 1993-11-12 WO PCT/DE1993/001083 patent/WO1994011192A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9411192A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6450097B1 (en) | 1999-04-08 | 2002-09-17 | Heidelberger Druckmaschinen Ag | Method of regulating inking when printing with a printing machine |
Also Published As
Publication number | Publication date |
---|---|
EP0668824B1 (de) | 1997-02-19 |
WO1994011192A1 (de) | 1994-05-26 |
JP2793718B2 (ja) | 1998-09-03 |
DE4238557A1 (de) | 1994-05-19 |
DE59305502D1 (de) | 1997-03-27 |
DE4395722D2 (de) | 1996-01-11 |
US5568769A (en) | 1996-10-29 |
JPH07508692A (ja) | 1995-09-28 |
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