EP2164706A2 - Method for detecting by measuring an imprinted printable material - Google Patents
Method for detecting by measuring an imprinted printable materialInfo
- Publication number
- EP2164706A2 EP2164706A2 EP08758709A EP08758709A EP2164706A2 EP 2164706 A2 EP2164706 A2 EP 2164706A2 EP 08758709 A EP08758709 A EP 08758709A EP 08758709 A EP08758709 A EP 08758709A EP 2164706 A2 EP2164706 A2 EP 2164706A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- frequency
- light source
- source
- measuring
- 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- Withdrawn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
- B41F33/0081—Devices for scanning register marks
-
- 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
Definitions
- the invention relates to a method for the metrological detection of a printed substrate according to the preamble of claim 1.
- a sensor in particular a camera, is positioned in the direction of transport of the printing material, which records sections of a printed image printed on the printing material or a print control mark printed on the printing material outside the printed image. It is customary to illuminate the measuring range of the sensor or the camera on the substrate by means of a measuring illumination source.
- the present invention is based on the problem to provide a novel method for metrological detection of a printed substrate.
- the measurement illumination source for illuminating the measurement area and at least one such secondary light source of the printing machine whose light can reach the measurement area are operated such that the frequency of the light provided by the measurement illumination source is smaller than the frequency of the one provided by the or each secondary light source light.
- the measurement illumination source and the or each secondary light source whose light can reach the measurement area such that the frequency of the light provided by the measurement illumination source is less than the frequency of the or each Secondary light source provided light.
- the light provided by the or each secondary light source which light can reach the measuring area which is emitted by the measuring illumination source, impairs the measurement result of the sensor.
- the measurement accuracy can be increased.
- the quality of the recording which is detrimental to the recording quality, is avoided over time, which occurs cyclically in the course of time.
- the secondary light source may in this context be a radiation source of emitted light for drying or curing printing inks and / or varnishes.
- the secondary light source can also emit such light which is necessary for carrying out the intended measurement.
- a special lamp in addition to the light spectrum required for curing or drying also generate light spectra that are sufficient for measuring the printed image.
- the measurement illumination source (possibly) can be dispensed with.
- the present invention can be used both in printing presses - both sheet-fed rotary and web-fed rotary printing presses and in finishing machines - such as in off-line paint machines or in an inkjet application.
- the present invention relates to a method for metrological detection of a printed substrate within a printing machine, in particular within a sheet-fed press.
- a printing material for printing is moved through a plurality of successively arranged printing units and / or coating units, wherein in each printing unit and / or coating unit a partial printing image in a special printing ink and / or by means of a special coating is applied to the printing material. Due to the overprinting of several partial print images, the desired complete multicolored print image is eventually produced on the printed sheet, if necessary with a complementary coating.
- a print control mark printed on the printing material outside the printed image is done using a sensor, preferably a camera.
- a predefined measuring range of the sensor on the printing material is illuminated with the aid of a measuring illumination source in order to ensure that the sensor, in particular the camera, can deliver good measured values.
- the measurement illumination source is matched to the recording characteristics of the sensor or the camera.
- secondary light sources can be installed on a printing press. Very often z. B. provided a UV curing light source in a dryer, with the aid of which applied to the substrate ink and / or lacquer cured and thus can be dried. Light provided by such secondary light sources can reach the measuring range of the sensor or the camera, which is illuminated by the measuring illumination source.
- the measuring illumination source which serves to illuminate the measuring range of the sensor and is tuned to its recording characteristic, and at least those or all of the secondary light sources of the printing machine, whose light can get into the measuring range, so to operate that the frequency of the light provided by the measurement illumination source is less than the frequency of the light provided by the or each secondary light source.
- secondary light sources whose light can get into the measuring range, operate at a higher frequency or drive as the measurement illumination source.
- a UV curing light source is incorporated within the printing machine, the light of which can reach the measuring area, this means that the measuring illumination source and the UV curing light source are operated in such a way that the frequency of the measuring illumination source provided light is smaller than the frequency of the UV light provided by the UV curing light source.
- the influence of the result of measurement of the printed image is avoided by any secondary light when the frequency is raised by appropriate control in a secondary light source upstream control device to a level above or well above the frequency level of the measurement illumination source.
- the secondary light source which is here designed as a UV curing light source, operated in a higher frequency range than the measurement illumination source.
- the curing light source is provided with a corresponding ballast.
- This ballast allows to change the frequency of the light required for drying or hardening.
- the frequency can be shifted into the range of very high values.
- the value of the frequency can be adapted to the conditions occurring in the drying process in connection with the substances used.
- the parameters for the type of printing ink and the printing substrate, the amount of ink applied, the ambient temperature and humidity and the machine speed can be taken into account.
- the method according to the invention finds application, inter alia, in the so-called sheet inspection.
- a finished printed sheet is passed through a measuring range after exiting the last printing unit of a sheet-fed offset printing machine.
- a line scan of the printed sheet is performed by means of a camera.
- the scanning is made possible by the illumination by means of an elongated light source arranged at the measuring area as a measuring illumination source.
- the measuring range for curing or drying of the ink applied to the sheet color layer is often followed by a dryer. This emits light into the measuring range, which is in line with the light the measurement illumination source mixes or overlays.
- the secondary light sources in this case the light source or the or the radiator of the dryer, are operated in a frequency range which is equal to or higher than that of the measurement illumination source. Therefore, a controller is provided which checks the frequency range of the secondary light source and optionally raises at least the value of the measurement illumination source.
- the method according to the invention is used in sheet-fed printing presses, in web-fed printing presses and in so-called finishing machines in which printed products go offline to the actual printing process, e.g. can be finished by painting or inkjet printing.
- the measuring illumination source can also be integrated into a secondary light source serving for drying printing ink and / or paint. This combined light source then radiates the required for the measurement and drying light in a mixture, in which case can be dispensed with a separate measurement illumination source.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Coating Apparatus (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710031088 DE102007031088A1 (en) | 2007-07-04 | 2007-07-04 | Method for metrological acquisition of a printed substrate |
PCT/EP2008/004111 WO2009003559A2 (en) | 2007-07-04 | 2008-05-23 | Method for detecting by measuring an imprinted printable material |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2164706A2 true EP2164706A2 (en) | 2010-03-24 |
Family
ID=40039957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08758709A Withdrawn EP2164706A2 (en) | 2007-07-04 | 2008-05-23 | Method for detecting by measuring an imprinted printable material |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2164706A2 (en) |
JP (1) | JP2010531980A (en) |
DE (1) | DE102007031088A1 (en) |
WO (1) | WO2009003559A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013211250B4 (en) * | 2013-06-17 | 2019-05-02 | Koenig & Bauer Ag | Printing machine with several printing units printed together on one substrate |
DE102016109934A1 (en) * | 2016-05-30 | 2017-11-30 | grapho metronic Meß- und Regeltechnik GmbH | Control of inline aggregates in a printing machine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19511782C2 (en) * | 1995-03-30 | 1997-07-31 | Kurandt System Gmbh | Process for checking color printing originals and device for carrying out the process |
US5767980A (en) * | 1995-06-20 | 1998-06-16 | Goss Graphic Systems, Inc. | Video based color sensing device for a printing press control system |
DE69711386T2 (en) * | 1997-10-14 | 2002-12-19 | Xeikon Nv | Method for controlling the register of printed images in a printer |
CH694184A5 (en) * | 2000-12-27 | 2004-08-31 | Bobst Sa | Device read rep'rage marks in a multicolour printing machine. |
JP2003251789A (en) * | 2001-12-27 | 2003-09-09 | Komori Corp | Printing quality inspection device of printing press |
GB2408799B (en) * | 2003-01-14 | 2005-12-21 | Qti Presstech Ltd | Improvements to scanning heads |
DE102005026127B4 (en) * | 2005-06-07 | 2007-02-08 | Koenig & Bauer Ag | Printing machine and a method for producing a printed product |
-
2007
- 2007-07-04 DE DE200710031088 patent/DE102007031088A1/en not_active Withdrawn
-
2008
- 2008-05-23 JP JP2010513695A patent/JP2010531980A/en not_active Withdrawn
- 2008-05-23 EP EP08758709A patent/EP2164706A2/en not_active Withdrawn
- 2008-05-23 WO PCT/EP2008/004111 patent/WO2009003559A2/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009003559A3 * |
Also Published As
Publication number | Publication date |
---|---|
JP2010531980A (en) | 2010-09-30 |
WO2009003559A3 (en) | 2009-02-19 |
DE102007031088A1 (en) | 2009-01-08 |
WO2009003559A2 (en) | 2009-01-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
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 |
|
17P | Request for examination filed |
Effective date: 20100204 |
|
AK | Designated contracting states |
Kind code of ref document: A2 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 MT NL NO PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: WALTER, THOMAS Inventor name: SEIDEL, FRANK Inventor name: SCHROEDER, GERHARD Inventor name: PETER, THOMAS Inventor name: MOHN, KARLHEINZ Inventor name: LIPPOLD, ANDREAS Inventor name: JUNG-DIEFENBACH, MARKUS |
|
19U | Interruption of proceedings before grant |
Effective date: 20120201 |
|
DAX | Request for extension of the european patent (deleted) | ||
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 |