EP1599341B1 - Method for the correction of variations in the amount of ink applied to the printed image occurring in the printing process - Google Patents
Method for the correction of variations in the amount of ink applied to the printed image occurring in the printing process Download PDFInfo
- Publication number
- EP1599341B1 EP1599341B1 EP04702336A EP04702336A EP1599341B1 EP 1599341 B1 EP1599341 B1 EP 1599341B1 EP 04702336 A EP04702336 A EP 04702336A EP 04702336 A EP04702336 A EP 04702336A EP 1599341 B1 EP1599341 B1 EP 1599341B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing
- actuating
- light
- control
- measured values
- 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
Links
- 238000007639 printing Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000012937 correction Methods 0.000 title description 2
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000012546 transfer Methods 0.000 claims abstract description 6
- 239000000976 ink Substances 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000006870 function Effects 0.000 claims description 10
- 230000003993 interaction Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 2
- 230000003595 spectral effect Effects 0.000 claims 1
- 230000007423 decrease Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000007774 anilox coating Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/08—Cylinders
- B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S101/00—Printing
- Y10S101/45—Sensor for ink or dampening fluid thickness or density
Definitions
- the invention relates to a method according to the preamble of claim 1.
- DE 101 45 957 describes, among other things, how to automatically adjust the positions of the rollers involved in the printing process after a job change
- a printing machine which allows the implementation of this method is shown in detail.
- the present application is dispensed with the detailed description and graphic representation of said device or the said method. Therefore, the corresponding passages are the DE 101 45 957 to understand the present application and are hereby incorporated in this application.
- the application of the above-mentioned method shortens the set-up times considerably.
- the rollers involved in the printing process are adjusted to one another in this way so that the printed images to be produced are well reproduced.
- the contact pressure between the rollers involved in the printing process is kept as low as possible.
- the publication DE-A_4413735 discloses a method and apparatus for adjusting the printing image of a rotary printing press in printing operation. Also, this printing machine has ink transfer rollers and associated with these actuators with which the position of the rollers is changeable. A sensor records the halftone dot size of the transmitted color. Due to the sensor signals, the roller position is regulated.
- the object of the present invention is therefore to minimize these fluctuations.
- target values within the meaning of claims 1 and 4 in each case in the DE 101 45 957 described form can be determined. That is, they can be taken once a "digital nominal form" of the printed image, which is stored in a memory unit
- the setpoint value in this context is a light intensity value which is recorded by the camera at a specific point of the characteristic curve of the light intensity.
- This light intensity value which is generally obtained during the pressing process, or the number of light intensity values which make up the printed image or subregions thereof, can be stored. He can then during the printing process as a setpoint within the meaning of the present application during the printing operation output from the memory unit and used for control purposes.
- a target value of the light intensity can also be a light intensity value which is recorded again and again at a certain point of the characteristic curve of the light intensity-possibly during the printing operation.
- a control of the roller position is made in addition to the known control.
- the position of the pressure rollers is preferably controlled only before the onset of the known control as a function of the printing speed.
- This control may be based on empirical values which are stored, for example, in the form of a calibration table in which a position value is assigned to a speed value.
- the assignment of positions to print speeds can also be done with the aid of appropriately adapted algorithms or functions. Also on this subject, the objective description provides an example.
- Fig. 1 shows the example of a printing unit with the plate roller K, the position of the plate cylinder K during the printing process.
- the plate cylinder K and other flexible materials involved in the printing process such as the rubber coating, not shown, which may also be present in some flexographic printing presses on the platen roller, and the printing material also not shown are exposed to strong forces in the printing process.
- the plate 12 is squeezed along the pressure line D between impression cylinder 11 and plate roller K.
- a similar process takes place at the printing line 13 between the cliché roller K and the ink roller F.
- the effective radius R eff which denotes the distance between the outer circumference of the plate and the rotation axis M immediately before the pressure line D is reached again, decreases.
- this effective radius R eff is critical to the quality of the printing process.
- the machine operator or the machine controller of a flexographic printing machine should make the cliché roller stronger against the platen roller 11.
- FIG. 2 shows a function which is based on the correction of the position of a roller x as a function of the speed v.
- the function has a staircase-like shape, that is to say that an increase in the printing speed after certain speed intervals ⁇ v results in addition processes by ⁇ x.
- this usually means that the cliché roll is moved further toward the impression cylinder as the speed increases.
- a further provision of the anilox roller to the plate cylinder should be necessary.
- the devices and methods shown can be used particularly advantageously in flexographic and gravure printing.
- the possibility shown of the speed-dependent control of the roller positions can be particularly with the inventive method Combine advantageous when first speed-dependent controlled and then regulated by means of the evaluation of the printed image.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Color, Gradation (AREA)
- Electronic Switches (AREA)
- Facsimile Image Signal Circuits (AREA)
- Rotary Presses (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruchs 1. In der Anmeldung
Die Druckschrift
Bei hohen Druckgeschwindigkeiten kommt es jedoch zu starken Schwankungen in der Farbintensität des übertragenen Druckbildes, die auf Schwankungen der beim Druckprozess übertragenen Farbmenge zurückzuführen sind. In der Regel nimmt die Farbintensität ab. Die Gründe für diesen überraschenden Effekt liegen nach Meinung der Anmelderin in Schwankungen des effektiven Radius der am Druckprozess beteiligten Walzen und im Trennverhalten der Druckfarben. Der erstere Effekt wird in der gegenständlichen Beschreibung näher dargelegt.At high printing speeds, however, there are strong fluctuations in the color intensity of the transferred print image, which are due to fluctuations in the amount of ink transferred during the printing process. As a rule, the color intensity decreases. According to the applicant, the reasons for this surprising effect lie in fluctuations in the effective radius of the rolls involved in the printing process and in the release behavior of the printing inks. The former effect is explained in more detail in the subject description.
Die Aufgabe der vorliegenden Erfindung ist es daher, diese Schwankungen zu minimieren.The object of the present invention is therefore to minimize these fluctuations.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.According to the invention, this object is solved by the features of the characterizing part of
Wichtig für das Verständnis des Umfanges der vorliegenden Erfindung ist, dass die "Sollwerte" im Sinne der Ansprüche 1 und 4 hierbei in jeder in der
"Sollwerte" im Sinne der vorliegenden Erfindung können aber auch ermittelt werden, indem der charakteristische Verlauf der Intensität des reflektierten Lichts, welcher sich beim Anstellen der am Druckprozess beteiligen Walzen ergibt, ausgewertet wird. Auch dieser charakteristische Verlauf und seine Auswertung zur Einstellung der Walzenpositionen ist in der
Die Formulierung "zumindest ein, Sensor - beispielsweise eine Kamera - weicher die Intensität des von dem bedruckten Stoff reflektierten Lichts aufzeichnet", welche sich bereits im kennzeichnenden Teil des Anspruchs 1 befindet, umschließt ausdrücklich alle zur Aufzeichnung von Lichtintensität geeigneten Sensoren. Die meisten dieser Sensoren arbeiten nach dem Stand der Technik aufgrund des Photoeffektes, wobei als optisch aktive Materialien in neuerer Zeit bevorzugt Halbleiter zum Einsatz kommen. Halbleiter sind auch Bestandteil elektronischer Kameras. Hierbei gehören CCD-Kameras (CCD = Charge Coupled Device) zu den bevorzugt benutzten Sensorsystemen.The phrase "at least one, sensor - for example a camera - softer recording the intensity of the light reflected from the printed fabric" already in the characterizing part of
Eine Steuerung der Walzenposition wird zusätzlich zu der bekannten Regelung vorgenommen. Hierzu wird die Position der Druckwalzen vorzugsweise vor Einsetzen der bekannten Regelung lediglich als Funktion der Druckgeschwindigkeit gesteuert. Dieser Steuerung können empirische Werte zugrunde liegen, die beispielsweise in Form einer Kalibriertabelle, in der einem Geschwindigkeitswert ein Positionswert zugeordnet ist, abgelegt werden. Natürlich kann die Zuordnung von Positionen zu Druckgeschwindigkeiten auch mit Hilfe entsprechend angepasster Algorithmen oder Funktionen erfolgen. Auch zu diesem Themenbereich liefert die gegenständliche Beschreibung ein Beispiel.A control of the roller position is made in addition to the known control. For this purpose, the position of the pressure rollers is preferably controlled only before the onset of the known control as a function of the printing speed. This control may be based on empirical values which are stored, for example, in the form of a calibration table in which a position value is assigned to a speed value. Of course, the assignment of positions to print speeds can also be done with the aid of appropriately adapted algorithms or functions. Also on this subject, the objective description provides an example.
Vorteilhafte Verfahren, bei denen zumindest ein Sensor die Intensität von Licht aufzeichnet, welches eine Wechselwirkung mit dem bedruckten Stoff erfahren hat, sind auch Verfahren, bei denen die Transmission von Licht durch Bedruckstoff gemessen wird. Zu diesem Zweck sollte die Intensität des auf den Bedruckstoff einfallenden Lichts bekannt sein, so dass sich die Absorption des Druckbildes aus der Differenz zwischen einfallendem und transmitiertem Licht ergibt. Vorteilhaft ist daher die Verwendung einer Lichtquelle, welche das einfallende Licht zur Verfügung stellt. Diese Bestrahlung kann unter Normbedingungen stattfinden. Diese können beispielsweise durch einen gegen Licht abgeschirmten Kasten, welcher den Bedruckstoff am Ort der Messung sowie die Lichtquelle und den Sensor vor Umgebungslicht schützt gewährleistet werden.
Auch bei diesen Ausführungsbeispielen der Erfindung wird die Intensität von Licht aufgezeichnet, welches eine Wechselwirkung mit dem bedruckten Stoff erfahren hat. Hierbei ist es unerheblich ob diese Wechselwirkung in einer Transmission beziehungsweise Absorption, einer Reflexion, Brechung oder einem sonstigen Wechselwirkungsvorgang zwischen Licht und Druckbild besteht.
Weitere Ausführungsbeispiele der Erfindung gehen aus der gegenständlichen Beschreibung und den Ansprüchen hervor.
Die einzelnen Figuren zeigen:
- Fig. 1
- Eine Veranschaulichung des Begriffs "effektiver Radius"
- Fig. 2
- Ein Beispiel für eine Funktion, aufgrund der eine Walzenposition in Abhängigkeit von der Druckgeschwindigkeit gesteuert wird.
Also in these embodiments of the invention, the intensity of light is recorded which has undergone an interaction with the printed fabric. It is irrelevant whether this interaction in a transmission or absorption, a reflection, refraction or other interaction between light and printed image.
Further embodiments of the invention will become apparent from the description and the claims.
The individual figures show:
- Fig. 1
- An illustration of the term "effective radius"
- Fig. 2
- An example of a function that controls a roller position depending on the printing speed.
Angesichts der hohen Fliehkräfte kann es bei der Verwendung anderer Materialien jedoch auch zu einer Vergrößerung des effektiven Radius Reff kommen, die ein Ansteigen des physikalischen Drucks an der Drucklinie D nach sich zieht. In diesem Fall wird die Klischeewalze K etwas weiter von dem Gegendruckzylinder 11 abgefahren. Beide Vorgänge werden für die Zwecke dieser Anmeldung unter dem Fachterminus dynamische Beistellung zusammengefasst. Wie bereits erwähnt kann sich auch das Farbtrennverhalten als Funktion der Druckgeschwindigkeit ändern und auf diese Weise die Farbübertragung beeinflussen.However, in view of the high centrifugal forces, the use of other materials can also increase the effective radius R eff , which causes an increase in the physical pressure at the pressure line D. In this case, the plate roller K is moved a little further from the
Die gezeigte Möglichkeit der geschwindigkeitsabhängigen Steuerung der Walzenpositionen lässt sich mit dem erfindungsgemäßen Verfahren besonders vorteilhaft kombinieren, wenn zuerst geschwindigkeitsabhängig gesteuert und dann mit Hilfe der Auswertung des Druckbildes geregelt wird.
Wie bereits erwähnt können auch andere Funktionen, Algorithmen oder Kalibriertabellen zur geschwindigkeitsabhängigen Steuerung herangezogen werden. Hierbei bieten sich auch lineare oder asymptotische Abhängigkeiten zwischen Druckgeschwindigkeit (v) und Walzenposition (x) an.
The possibility shown of the speed-dependent control of the roller positions can be particularly with the inventive method Combine advantageous when first speed-dependent controlled and then regulated by means of the evaluation of the printed image.
As already mentioned, other functions, algorithms or calibration tables can also be used for the speed-dependent control. Linear or asymptotic dependencies between print speed (v) and roller position (x) are also suitable.
Claims (6)
- Method for setting the printing image of a rotary printing press- which has ink transfer rolls (F, K) and actuating drives which are assigned to the latter and- by way of which the position of the rolls (F, K) can be changed, and in whichcharacterized in that, in the case of changes in the printing speed (v), the control and regulating unit generates further actuating signals, on account of which the actuators set the roll position first of all as a function of the printing speed (v).■ at least one sensor, for example a camera, records the intensity of light which has experienced an interaction with the printed material, and■ the recorded measured values are fed to a control and regulating unit■ which compares the recorded measured values with setpoint values and■ which generates actuating signals for the actuating drive of at least part of the rolls which are involved in the printing process,■ on account of which actuating signals the actuating drive changes the relative position (x) of the roll which is assigned to it until the measured values again lie within a tolerance range,■ at least one sensor recording measurements of the intensity of light during the printing process, which light has experienced an interaction with the printed material,■ the measured values during printing operation being assigned to the inks which are transferred in the at least one inking unit■ the control and regulating unit generating actuating signals, during printing operation, for the actuating drive of at least part of the rolls (F, K) of the respective inking unit which are involved in the printing process,■ with the result that the fluctuations occurring in the printing process in the ink quantity which is transferred onto one unit of surface area of the printing image remain within a setpoint range,
- Method according to Claim 1, characterized in that, in the case of changes in the printing speed (v), the control and regulating unit generates the further actuating signals on the basis of calibrating tables or algorithms which are stored in a memory unit.
- Method according to one of the preceding claims, characterized in that the at least one sensor records the intensity of light which has previously penetrated through the printed material.
- Method according to Claim 3, characterized in that at least one light source loads the printed material with light on that side of the said printing material which lies opposite the at least one sensor.
- Rotary printing press having the following features:- ink transfer rolls (F, K) and actuating drives which are assigned to the former,- it being possible for at least one actuating drive to change the relative position (x) of the roll which is assigned to the said actuating drive, on the basis of actuating signals of the control and regulating unit,- at least one sensor, for example a camera, for recording the intensity of light which has experienced an interaction with the printed material,- a control and regulating unit which has means for comparing the recorded measured values with setpoint values and by way of which actuating signals can be generated for the actuating drive of at least part of the rolls (F, K) which are involved in the printing process,- the control and regulating unit being loaded with a program, by way of which the measured values during printing operation can be assigned to the inks which are transferred in the at least one inking unit, and- it being possible for the control and regulating unit to generate actuating signals during printing operation for the actuating drive of at least part of the rolls of the respective inking unit which are involved in the printing process,characterized by a control and regulating unit, by way of which, in the case of changes in the printing speed (v), further actuating signals can be generated, on the basis of which the actuators set the roll positions first of all as a function of the printing speed (v).
- Apparatus according to Claim 5, characterized by at least one sensor, by way of which the light intensity can be measured in different spectral ranges.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10302747A DE10302747A1 (en) | 2003-01-24 | 2003-01-24 | Method for correcting variations in the amount of ink transferred to the printed image during the printing process |
DE10302747 | 2003-01-24 | ||
PCT/EP2004/000416 WO2004065127A2 (en) | 2003-01-24 | 2004-01-15 | Method for the correction of variations in the amount of ink applied to the printed image occurring in the printing process |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1599341A2 EP1599341A2 (en) | 2005-11-30 |
EP1599341B1 true EP1599341B1 (en) | 2010-07-14 |
Family
ID=32694948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04702336A Expired - Lifetime EP1599341B1 (en) | 2003-01-24 | 2004-01-15 | Method for the correction of variations in the amount of ink applied to the printed image occurring in the printing process |
Country Status (7)
Country | Link |
---|---|
US (1) | US7444935B2 (en) |
EP (1) | EP1599341B1 (en) |
AT (1) | ATE473864T1 (en) |
DE (2) | DE10302747A1 (en) |
ES (1) | ES2348297T3 (en) |
IL (1) | IL169814A (en) |
WO (1) | WO2004065127A2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004022085B4 (en) * | 2004-05-05 | 2012-01-26 | Manroland Ag | Method for controlling and / or regulating the printing speed during startup, up and / or shutdown of a printing press |
FR2892661B1 (en) * | 2005-11-03 | 2008-02-01 | Goss Int Montataire Sa | METHOD OF ADJUSTING THE INK QUANTITY APPLIED ON A PRODUCT TO BE PRINTED AND CORRESPONDING DEVICE. |
DE102007022079A1 (en) * | 2007-05-11 | 2008-11-13 | Heidelberger Druckmaschinen Ag | Method for automated adjustment of a rotational body pressure in a printing machine |
JP2009000881A (en) * | 2007-06-21 | 2009-01-08 | Komori Corp | Printing quality controlling method and device of relief printing machine |
US10882306B2 (en) | 2010-10-19 | 2021-01-05 | Pressco Technology Inc. | Method and system for decorator component identification and selected adjustment thereof |
IT1403496B1 (en) | 2010-12-27 | 2013-10-17 | Uteco Converting Spa | SYSTEM AND PROCEDURE FOR SETTING AND CHECKING THE PRESSURES OF PRINTING CYLINDERS IN A FLEXOGRAPHIC PRINTING MACHINE WITH CENTRAL DRUM |
DE102016215748A1 (en) | 2016-08-23 | 2018-03-01 | Robert Bosch Gmbh | Flexographic printing machine with different peripheral speeds on the anilox roller and the plate cylinder |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3185088A (en) * | 1961-12-01 | 1965-05-25 | Harris Intertype Corp | Method and apparatus for predetermining settings for ink fountain keys |
US5992318A (en) * | 1993-10-28 | 1999-11-30 | Perretta Graphics Corporation | System for maintaining ink density |
DE4413735C2 (en) * | 1994-04-20 | 2003-09-25 | Heidelberger Druckmasch Ag | Method for controlling or regulating the printing process of an autotypically working printing machine when printing under pressure on a printing material |
US6291829B1 (en) * | 1999-03-05 | 2001-09-18 | Hewlett-Packard Company | Identification of recording medium in a printer |
DE20122584U1 (en) * | 2001-03-27 | 2006-07-27 | Windmöller & Hölscher Kg | Print image setting device for rotary printing machine has camera feeding successively acquired print images to control or regulating unit that produces signals for participating rollers |
US6497179B1 (en) * | 2001-07-19 | 2002-12-24 | Hewlett Packard Company | Method and apparatus for distinguishing transparent media |
DE10204514B4 (en) | 2002-02-05 | 2006-03-23 | Windmöller & Hölscher Kg | Apparatus and method for correcting the longitudinal registration error which occurs due to the provision |
US6816180B1 (en) * | 2003-05-05 | 2004-11-09 | Eastman Kodak Company | Authenticated images on labels |
US6960777B2 (en) * | 2003-08-23 | 2005-11-01 | Hewlett-Packard Development Company, L.P. | Image-forming device sensing mechanism |
-
2003
- 2003-01-24 DE DE10302747A patent/DE10302747A1/en not_active Ceased
-
2004
- 2004-01-15 WO PCT/EP2004/000416 patent/WO2004065127A2/en active Application Filing
- 2004-01-15 US US10/541,849 patent/US7444935B2/en not_active Expired - Fee Related
- 2004-01-15 ES ES04702336T patent/ES2348297T3/en not_active Expired - Lifetime
- 2004-01-15 EP EP04702336A patent/EP1599341B1/en not_active Expired - Lifetime
- 2004-01-15 AT AT04702336T patent/ATE473864T1/en not_active IP Right Cessation
- 2004-01-15 DE DE502004011392T patent/DE502004011392D1/en not_active Expired - Lifetime
-
2005
- 2005-07-21 IL IL169814A patent/IL169814A/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
WO2004065127A3 (en) | 2004-11-04 |
WO2004065127A2 (en) | 2004-08-05 |
ATE473864T1 (en) | 2010-07-15 |
IL169814A (en) | 2008-08-07 |
ES2348297T3 (en) | 2010-12-02 |
US7444935B2 (en) | 2008-11-04 |
DE502004011392D1 (en) | 2010-08-26 |
US20060102038A1 (en) | 2006-05-18 |
EP1599341A2 (en) | 2005-11-30 |
DE10302747A1 (en) | 2004-08-12 |
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