EP2307200A1 - Druckmaschine - Google Patents
DruckmaschineInfo
- Publication number
- EP2307200A1 EP2307200A1 EP09779814A EP09779814A EP2307200A1 EP 2307200 A1 EP2307200 A1 EP 2307200A1 EP 09779814 A EP09779814 A EP 09779814A EP 09779814 A EP09779814 A EP 09779814A EP 2307200 A1 EP2307200 A1 EP 2307200A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reference color
- printing machine
- color pattern
- printing
- machine according
- 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.)
- Withdrawn
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
- H04N1/6044—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis involving a sensor integrated in the machine or otherwise specifically adapted to read the test pattern
Definitions
- the invention relates to a printing press according to the preamble of claim 1.
- the illumination behavior of the illumination source as well as the measurement characteristic of the camera used may change.
- this then leads to different measured values for the measuring pixels of the camera, which then in the case of methods known from practice, concludes that there is a changing coloring, although the coloring as such actually remains unchanged. If such measured values are then used for color control, this has a negative effect on the print quality. This is a disadvantage.
- a rotating assembly of the printing press is assigned at least one reference color pattern, which is not covered by the printing material, wherein the camera metrologically detects the illuminated substrate and the or each illuminated reference color pattern, wherein a Kalibriereinrich- device recorded with the camera color value of the respective reference color pattern with a compares the reference color value stored for the respective reference color pattern and, on the basis of this comparison, determines correction values for at least those for measuring pixels of the camera which metrologically detect the respective reference color pattern in order to correct measured values of the measuring pixels with the aid of the correction values.
- At least one constant, permanent reference color pattern which is assigned to a rotating assembly group of the printing press which is not covered by the printing material, can compensate for a changing illumination behavior of a lighting source as well as a changing measuring characteristic of the camera used.
- a change in the color properties of the substrate can be differentiated from changes in the illumination source and the camera. As a result, the measurement accuracy can be increased.
- the invention relates to a printing machine, in particular a sheet-fed printing machine, wherein a sheet-fed printing machine comprises a plurality of printing units for printing on printed sheets.
- a printing unit comprises an impression cylinder, a rolling on the impression cylinder transfer cylinder, a rolling on the transfer cylinder form cylinder, an inking unit and optionally a dampening unit.
- a printing form is positioned on the printing unit with the aid of the inking unit and dampening solution is applied by means of the dampening unit.
- the ink applied to the printing form is transferred to a printing material by means of a transfer mold positioned on the transfer cylinder, which is transported through a printing gap between the transfer cylinder and the impression cylinder.
- printing machines which comprise a device for measuring the color of a printed substrate within the printing press.
- a device for measuring the color of a printed substrate within the printing press or inline for printing comprises an illumination source to illuminate the printed substrate within the printing machine and a camera having a plurality of measuring pixels to print the illuminated substrate within the printing machine Detect area of the same metrologically.
- the area of the printing material illuminated by the illumination source and the area of the printing material captured by the camera preferably extend over the entire format width of the printing material.
- the camera used for measuring the printing material is calibrated to the type of printing material and to the illumination source, wherein in particular changes in the illumination behavior of the illumination source as well as the measuring characteristic of the camera used can lead to a falsification of color values of the printed printing material detected with the aid of the camera. There is therefore a need for a printing machine with which the change in a lighting behavior of the illumination source and a change in the measuring characteristic of the camera used can be compensated or compensated.
- a rotating assembly of the printing machine is assigned at least one reference color pattern, namely such that the reference color pattern is not covered by the printing material, illuminated by the illumination source and can be detected by the camera by measurement.
- the camera records the illuminated substrate as well as the or each reference color pattern, wherein a calibration device compares a color value of the respective reference color pattern recorded with the camera with a reference color value stored for the respective reference color pattern and based on this comparison at least for the measuring pixels of the camera measuring the respective reference color pattern - acquire technical data, determine correction values in order to correct measured values of the measuring pixels with the aid of the correction values.
- the or each reference color pattern is a permanent and thus constant color pattern, with the help of which the referencing to a constant reference value and thus an absolute calibration is possible.
- a counter-pressure cylinder of a printing unit of the printing press is assigned the or each reference color pattern.
- a reference color pattern with at least one gripper of the impression cylinder, which serves to grasp a printed substrate in the region of a so-called leading edge thereof.
- reference color patterns in the region of the leading edge between adjacent grippers can be positioned, for example, on connections between them, which are then preferably in the plane of the printing material, whereas reference color patterns applied to the grippers are positioned above the plane of the printing material.
- at least one reference color pattern can also be assigned to a channel of the impression cylinder, with the or each reference color pattern assigned to the channel of the impression cylinder then extending along a trailing edge of the respective printing material or printing sheet.
- the or each reference color pattern may be detachably or permanently connected to the rotating assembly of the printing press, preferably to the impression cylinder.
- At least one reference color pattern for white is present.
- a white reference color pattern all channels of a camera can be referenced or calibrated.
- additional reference color patterns for cyan and / or magenta and / or yellow and / or black are additionally present in order to individually reference or calibrate individual channels of the camera.
- reference color patterns for red and / or green and / or blue are present so as to directly calibrate individual channels of the camera. The colors mentioned here for reference color patterns are preferred, but not mandatory.
- each reference color pattern extends along a leading edge and / or along a trailing edge of the printed substrate, namely printed signature, and thus along the format width of the signature, without the or each reference color pattern is covered by the substrate and thus printing sheet ,
- a corresponding correction value can be determined for each measuring pixel of a line scan camera. Then, if the or each reference color pattern extends only in sections over the axial format width of the printed sheets, a corresponding correction value can be determined directly with the invention for the measuring pixels which metrologically detect the respective reference color pattern. For those measuring pixels which do not detect a reference color pattern by measurement, corresponding correction values can be determined, for example, by interpolation or by measuring an unprinted area of a printing material.
- the printing press according to the invention comprises a cleaning device in order to clean the or each reference color pattern at defined time intervals and / or depending on the degree of soiling.
- the cleaning device can be z. B. working with compressed air or remove dirt from the or each reference color pattern by mechanical or chemical means.
- a cleaning device to continuously clean the or each reference color pattern with each rotation of the rotating assembly to which the respective reference color pattern is assigned.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008040364A DE102008040364A1 (de) | 2008-07-11 | 2008-07-11 | Druckmaschine |
PCT/EP2009/057528 WO2010003791A1 (de) | 2008-07-11 | 2009-06-17 | Druckmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2307200A1 true EP2307200A1 (de) | 2011-04-13 |
Family
ID=40957650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09779814A Withdrawn EP2307200A1 (de) | 2008-07-11 | 2009-06-17 | Druckmaschine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2307200A1 (de) |
JP (1) | JP2011527419A (de) |
DE (1) | DE102008040364A1 (de) |
WO (1) | WO2010003791A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016224307A1 (de) | 2015-12-15 | 2017-06-22 | Heidelberger Druckmaschinen Ag | Verfahren zur Überprüfung eines Bildinspektionssystems |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20213431U1 (de) * | 2002-08-31 | 2002-11-07 | Roland Man Druckmasch | Einrichtung zur Qualitätskontrolle an Drucksachen |
DE102004021601B4 (de) | 2004-05-03 | 2020-10-22 | Heidelberger Druckmaschinen Ag | Inline-Messung und Regelung bei Druckmaschinen |
-
2008
- 2008-07-11 DE DE102008040364A patent/DE102008040364A1/de not_active Withdrawn
-
2009
- 2009-06-17 JP JP2011517064A patent/JP2011527419A/ja not_active Withdrawn
- 2009-06-17 EP EP09779814A patent/EP2307200A1/de not_active Withdrawn
- 2009-06-17 WO PCT/EP2009/057528 patent/WO2010003791A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010003791A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010003791A1 (de) | 2010-01-14 |
JP2011527419A (ja) | 2011-10-27 |
DE102008040364A1 (de) | 2010-01-14 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20101206 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA RS |
|
17Q | First examination report despatched |
Effective date: 20110621 |
|
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
19U | Interruption of proceedings before grant |
Effective date: 20120201 |
|
19W | Proceedings resumed before grant after interruption of proceedings |
Effective date: 20140203 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Effective date: 20140311 |