EP0132624B1 - Vorrichtung zur zonenweisen messtechnischen Kontrolle der Feuchtmittelführung im Farbwerk einer Offsetdruckmaschine - Google Patents

Vorrichtung zur zonenweisen messtechnischen Kontrolle der Feuchtmittelführung im Farbwerk einer Offsetdruckmaschine Download PDF

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Publication number
EP0132624B1
EP0132624B1 EP84107564A EP84107564A EP0132624B1 EP 0132624 B1 EP0132624 B1 EP 0132624B1 EP 84107564 A EP84107564 A EP 84107564A EP 84107564 A EP84107564 A EP 84107564A EP 0132624 B1 EP0132624 B1 EP 0132624B1
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EP
European Patent Office
Prior art keywords
measuring
measuring roller
roller
oleophilic
coverage
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
Application number
EP84107564A
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German (de)
English (en)
French (fr)
Other versions
EP0132624A1 (de
Inventor
Willi Jeschke
Dimitrios Dipl.-Ing. Pyliotis
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
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to AT84107564T priority Critical patent/ATE32045T1/de
Publication of EP0132624A1 publication Critical patent/EP0132624A1/de
Application granted granted Critical
Publication of EP0132624B1 publication Critical patent/EP0132624B1/de
Expired 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
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/10—Tripping devices or stop-motions for starting or stopping operation of damping or inking units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0063—Devices for measuring the thickness of liquid films on rollers or cylinders

Definitions

  • the invention relates to a device for zone-wise metrological control of the dampening solution guide in the inking unit of an offset printing press with a measuring roller resting on an inking roller with partly oleophilic, partly hydrophilic surface areas and an optoelectronic measuring device assigned to the measuring roller and working without contact over its entire width.
  • the fact that the color requirement of a printed image over the printing form width depends on the respective area coverage is taken into account by zonal control or regulation of the ink supply.
  • the dampening solution on the other hand, is fed to the printing plate over its entire width in the form of a film that is as thin and uniform as possible. In an equivalent way to ink consumption, however, more dampening solution may also be required at certain local plate areas than at other locations on the printing plate. This locally increased ink requirement is attempted to be remedied by a dampening solution supply averaged over all image areas, on the assumption that a ink / fountain solution emulsion forms in the inking unit, which produces the necessary compensation.
  • a roller with oleophilic and hydrophilic surfaces is also known from JP-A-58-42463, the distribution of the two surface areas being designed in a grid pattern.
  • this roller is used for the ink transfer from an immersion roller to another roller, the oleophilic surfaces being deepened and the amount of ink applied can thus be adjusted precisely by doctoring the ink.
  • the invention takes advantage of the knowledge that both chrome and aluminum rollers as connection rollers between the inking and dampening units run bright, i. H. preferably absorb dampening solution and repel ink when moistened.
  • the object of the invention is to create a simple control device with little manufacturing effort, with which the fluctuations in the dampening solution content of the printing ink resulting from partially different evaporation of the dampening solution and different ink consumption can be used uniformly over the entire machine width for subsequent use to influence the dampening solution supply in zones get measured precisely.
  • oleophilic surface areas are distributed in a grid pattern, are arranged on the entire surface of the measuring roller, the coverage of the grid with color being detectable with the optoelectronic measuring device and the signal formed by the measuring device representing the measured variable for setting the dampening solution guide .
  • the dampening solution guidance can be checked very effectively zone by zone in order to achieve perfect print quality, even in a narrow tolerance range, since the coverage of the oleophilic grid with ink is strongly dependent on its dampening solution content and thus indirectly represents a measure of the dampening solution guidance. Even the smallest changes in coverage reliably indicate changes in the ink-fountain solution balance and thus an excess or insufficient amount of fountain solution, in particular the uniformity of the Measurement results of all ink zones across the entire width of the machine is particularly advantageous.
  • the sensitivity of the measuring device can be optimized and an accurate statement about the dampening solution supply can thereby be achieved.
  • a preferred embodiment of the invention is that the oleophilic screen has uniform area coverage of any degree of coverage both in the longitudinal and in the circumferential direction of the measuring roller.
  • the oleophilic grid is designed as a grid wedge that runs continuously in the circumferential direction of the measuring roller and has a continuously decreasing area coverage from 100% to 0%. This benefits a higher measuring sensitivity of the measuring roller and thus a better differentiation of the area coverage, which is also reflected in a continuously and more accurate display of the measurement result.
  • a measuring roller 3 is employed on an inking roller 1 of a plate cylinder (not shown). For reasons of space, the measuring roller 3 is preferably positioned on the last inking roller 1.
  • the surface of the measuring roller 3 consists of a material with hydrophilic properties, preferably aluminum or chromium.
  • an oleophilic grid 4 preferably made of copper or plate layer (light-sensitive layer), is produced on the surface of the measuring roller 3.
  • the geometry of the oleophilic grid 4 can be point-shaped or square-shaped and can have different surface coverings, the cheapest surface cover in each case being determined empirically.
  • an opto-electronic measuring device 6 of known type is provided, which is equipped with at least one sensor 7 which can be displaced laterally in the longitudinal direction of the measuring roller 3 with the radiation source 8 assigned to it (FIG. 2).
  • the measuring device 6 is coupled to a display device 9 which can optionally be switched to different zones.
  • the measuring device 6 is preferably equipped with a large number of sensors 7, with each zone to be measured being assigned its own sensor 7.
  • the display device 9 extends over the entire machine width and allows a coherent display of all measured values of the area coverage at the same time.
  • the type and function of such opto-electronic measuring devices 6 are from the prior art, for. B. from DE-AS 27 36 663, known and therefore need not be shown in more detail and described in more detail.
  • the oleophilic grid 4 - as in the basic version - has a uniform area coverage with an arbitrarily selectable degree of coverage in the longitudinal direction of the measuring roller 3, but is provided with an uneven area coverage with different degrees of coverage in the circumferential direction of the measuring roller 3.
  • the uneven area coverage can be graded, e.g. B. with degrees of coverage of 20, 30, 40, 50%, etc. or as a stepless grid wedge 10 with continuously decreasing or increasing area coverage from 100% to 0%.
  • the oleophilic grid 4 the copper surface, takes on the printing ink and is thus colored, while the remaining hydrophilic surface areas 5, the aluminum or chrome surfaces, do not take on any color.
  • the coverage of the oleophilic grid by the amount of ink transferred to it is strongly dependent on the dampening solution management, i. H. depending on the dampening solution content of the ink. Is z. B. the dampening solution guide is set too high, so the oleophilic grid 4 takes on less color. The reverse is true if the dampening solution supply is too low.
  • the overlap or its change on the oleophilic grid 4 is now measured continuously, preferably in all zones simultaneously.
  • the measured values are converted into display signals in process steps known per se and therefore not described, amplified and then displayed in the display device 9 in analog or digital form. Instead, it is also possible to use the measured values directly as control commands for direct control of zonal actuators in a dampening unit. This coverage on the measuring roller 3 represents a reliable measure of the print quality.
  • the above-mentioned, uniformly graduated surface coverage of the oleophilic grid 4 in the circumferential direction of the measuring roller 3 of the embodiment according to FIG. 3 enables - in accordance with the selected gradation - the metrological Detection of moisture changes in finely divided steps. It has proven to be particularly advantageous in relation to better differentiation of the area coverage to provide the measuring roller 3 with the stepless raster wedge 10. This type of screening is particularly sensitive and very quick to respond to even minor changes in coverage.
  • the sensor signal is shown on the ordinate as a function of the overlap of the measuring roller 3 plotted on the abscissa.
  • the measuring roller 3 only accepts ink from the inking roller 1 and is completely inked, so that the sensor or sensors 7 determine 100% coverage .
  • the associated sensor signal of full tone reflection is characterized by reference number 11.
  • the dampening unit After printing, when the dampening unit has started its work, an ink / dampening solution emulsion forms in the inking unit, whereby the measuring roller 3 accepts both ink and dampening solution. This changes their coverage and to the same extent the sensor signal.
  • the tolerance range 13 of the dampening solution guide is defined by its upper and lower limits 14 and 15.
  • the mean value of the dampening solution guidance when the ink on the measuring roller 3 and the dampening solution keep the balance is shown in dashed lines and identified by the reference number 16.
  • the extreme case opposite to full tone reflection occurs when, for example, the measuring roller 3 runs bare without ink due to excessive dampening solution guidance (point 12).
  • the radiation emitted by the radiation source 8 measuring radiation is on the hydrophilic top f lächenberei- chen 5 totally reflected.
  • the level of the sensor signal 12 of this total reflection corresponds to a degree of coverage of the measuring roller 3 of 0%.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Spectrometry And Color Measurement (AREA)
EP84107564A 1983-07-23 1984-06-29 Vorrichtung zur zonenweisen messtechnischen Kontrolle der Feuchtmittelführung im Farbwerk einer Offsetdruckmaschine Expired EP0132624B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84107564T ATE32045T1 (de) 1983-07-23 1984-06-29 Vorrichtung zur zonenweisen messtechnischen kontrolle der feuchtmittelfuehrung im farbwerk einer offsetdruckmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833326698 DE3326698A1 (de) 1983-07-23 1983-07-23 Vorrichtung zur zonenweisen messtechnischen kontrolle der feuchtmittelfuehrung im druckwerk einer offsetdruckmaschine
DE3326698 1983-07-23

Publications (2)

Publication Number Publication Date
EP0132624A1 EP0132624A1 (de) 1985-02-13
EP0132624B1 true EP0132624B1 (de) 1988-01-20

Family

ID=6204814

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107564A Expired EP0132624B1 (de) 1983-07-23 1984-06-29 Vorrichtung zur zonenweisen messtechnischen Kontrolle der Feuchtmittelführung im Farbwerk einer Offsetdruckmaschine

Country Status (11)

Country Link
US (1) US4722274A (xx)
EP (1) EP0132624B1 (xx)
JP (1) JPS6054849A (xx)
KR (1) KR860000598B1 (xx)
AT (1) ATE32045T1 (xx)
CA (1) CA1221852A (xx)
DE (2) DE3326698A1 (xx)
DK (1) DK286684A (xx)
ES (1) ES533544A0 (xx)
NO (1) NO842971L (xx)
ZA (1) ZA844732B (xx)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4864925A (en) * 1987-09-28 1989-09-12 Rockwell International Corporation Simplified lithography using ink and water admixtures
US5018445A (en) * 1988-04-19 1991-05-28 Six Albert J Magnetically delivered ink
DE8904197U1 (de) * 1989-04-05 1989-05-18 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Walze im Druckwerk von Rotationsdruckmaschinen
US5694846A (en) * 1991-06-06 1997-12-09 Baldwin Graphics Systems, Inc. Fountain solution supply system
EP0517462B1 (en) * 1991-06-06 1999-01-20 BALDWIN GRAPHIC SYSTEMS, Inc. Dampening fluid supply system
US5360399A (en) * 1992-01-10 1994-11-01 Robert Stegmann Method and apparatus for maintaining the normal intraocular pressure
DE4214139C2 (de) * 1992-04-29 2002-01-10 Heidelberger Druckmasch Ag Verfahren zur Feuchtmittelregulierung beim Drucken von einem Formzylinder in einer Offsetdruckmaschine
DE4244500A1 (de) * 1992-12-30 1994-07-07 Heidelberger Druckmasch Ag Verfahren zum Zuführen von Feuchtmittel
DE4303282C2 (de) * 1993-02-05 2002-02-28 Heidelberger Druckmasch Ag Vorrichtung zur Feuchtmittelzufuhr bei einer Offsetdruckmaschine
DE9305742U1 (de) * 1993-04-16 1993-06-17 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Feuchtwerk für Offsetdruckmaschinen
US5592880A (en) * 1993-12-30 1997-01-14 Heidelberger Druckmaschinen Method of supplying or feeding dampening solution
US5791249A (en) * 1997-03-27 1998-08-11 Quad/Tech, Inc. System and method for regulating dampening fluid in a printing press
US5826507A (en) * 1997-05-22 1998-10-27 Union Camp Corporation Method for measuring the amount of fountain solution in offset lithography printing
DE10316240A1 (de) * 2003-04-09 2004-11-04 Maschinenfabrik Wifag Walze für eine Druckmaschine und Verfahren zur Herstellung einer Walze
CN111929319B (zh) * 2020-10-14 2021-04-09 天津文洲机械有限公司 一种间接式高精度丝网破损视觉检测机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1303819C2 (de) * 1964-05-29 1973-07-12 Vorrichtung zum messen einer schichtdicke auf oberflaechen
US3756725A (en) * 1970-10-12 1973-09-04 Harris Intertype Corp Measurement and control of ink density
DE2214721B1 (de) * 1972-03-25 1973-06-14 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Verfahren und vorrichtung zum selbsttaetigen ausregeln von schwankungen der farb- und feuchtfluessigkeitsfuehrung an offsetmaschinen
DE2736663C3 (de) * 1977-08-13 1985-05-15 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Vorrichtung zur Ermittlung des Feucht- und Farbgleichgewichts bei Offsetdruckwerken
DD157779A1 (de) * 1980-10-06 1982-12-08 Hans Johne Verfahren und vorrichtung zur optimalen zumessung des feuchtmittels
DE3220282C3 (de) * 1982-05-28 1995-05-18 Roland Man Druckmasch Vorrichtung zum betrieblichen Erfassen eines Maßes für die Feuchtmittelmenge auf der rotierenden Druckplatte in Offset-Druckmaschinen

Also Published As

Publication number Publication date
NO842971L (no) 1985-01-24
KR850001087A (ko) 1985-03-14
US4722274A (en) 1988-02-02
DK286684A (da) 1985-01-24
ATE32045T1 (de) 1988-02-15
DE3326698A1 (de) 1985-02-07
JPH0339459B2 (xx) 1991-06-13
ES8502911A1 (es) 1985-02-16
DE3468837D1 (en) 1988-02-25
ZA844732B (en) 1985-02-27
JPS6054849A (ja) 1985-03-29
ES533544A0 (es) 1985-02-16
EP0132624A1 (de) 1985-02-13
DK286684D0 (da) 1984-06-12
KR860000598B1 (ko) 1986-05-22
CA1221852A (en) 1987-05-19

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