EP0132624B1 - Device for the zonal control of the dampness circuit in the inking unit of an offset printing machine by means of measuring techniques - Google Patents
Device for the zonal control of the dampness circuit in the inking unit of an offset printing machine by means of measuring techniques Download PDFInfo
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- 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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- Prior art keywords
- measuring
- measuring roller
- roller
- oleophilic
- coverage
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- 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
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- 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%.
Abstract
Description
Die Erfindung bezieht sich auf eine Vorrichtung zur zonenweisen meßtechnischen Kontrolle der Feuchtmittelführung im Farbwerk einer Offsetdruckmaschine mit einer, an einer Farbauftragswalze anliegenden Meßwalze mit teils oleophilen, teils hydrophilen Oberflächenbereichen und einer der Meßwalze zugeordneten, berührungslos über deren gesamte Breite arbeitenden, optoelektronischen Meßeinrichtung.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.
Beim Offsetdruckprozeß ist für die Qualität des zu erzielenden Druckproduktes insbesondere das Gleichgewicht zwischen Feuchtmittel und Farbe auf der Offsetdruckplatte von maßgebender Bedeutung. Die Herstellung dieses optimalen Gleichgewichtes und dessen anschließende Aufrechterhaltung bedarf einer großen Erfahrung des Druckers mit erheblichem Zeitaufwand für Stelleingriffe in die Feucht- und/oder Farbgebung.In the offset printing process, the balance between fountain solution and ink on the offset printing plate is of particular importance for the quality of the print product to be achieved. The establishment of this optimal balance and its subsequent maintenance requires a great deal of experience of the printer with considerable expenditure of time for intervention in the dampening and / or coloring.
Dem Umstand, daß der Farbbedarf eines Druckbildes über die Druckformbreite gesehen von der jeweiligen Flächendeckung abhängig ist, trägt man durch zonale Steuerung bzw. Regelung der Farbzufuhr Rechnung. Das Feuchtmittel hingegen wird der Druckplatte über deren gesamte Breite in Form eines möglichst dünnen und gleichmäßigen Films zugeführt. In äquivalenter Weise zum Farbverbrauch kann jedoch an bestimmten örtlichen Plattenbereichen ebenfalls mehr Feuchtmittel benötigt werden als an anderen Stellen der Druckplatte. Diesem örtlich erhöhten Farbbedarf versucht man durch eine über alle Bildebereiche gemittelten Feuchtmittelzufuhr Abhilfe zu schaffen, in der Annahme, daß sich im Farbwerk eine Farb-Feuchtmittelemulsion bildet, die den erforderlichen Ausgleich herstellt. Messungen des Feuchtmittelgehaltes der Farbe im Farbwerk haben jedoch ergeben, daß die Zusammensetzung der im Farbwerk sich bildenden Farb-Feuchtmittelemulsion derart unterschiedlich ist, daß dadurch qualitätsmindernde Druckschwierigkeiten auftreten, obgleich die Feuchtmittelzufuhr korrekt sein müßte.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. However, measurements of the fountain solution content of the ink in the inking unit have shown that the composition of the ink / fountain solution emulsion which forms in the inking unit is so different that this leads to quality-reducing printing difficulties, although the dampening solution supply should be correct.
Viele der zur Kontrolle der Feuchtmittelzufuhr eingesetzten bekannten Meßvorrichtungen weisen allgemein den Nachteil auf, daß deren Meßwerte nicht ausreichend berücksichtigen, ob eine der angestrebten Druckqualität gerechte Einfärbung der Druckplatte eingestellt oder dieselbe gar unterbrochen ist. Aus diesem Grunde sind sie auch nur beschränkt zur rrießtechnischen Kontrolle einer richtigen Druckplatteneinfärbung geeignet. - Many of the known measuring devices used to control the fountain solution supply generally have the disadvantage that their measured values do not take sufficient account of whether the inking of the printing plate that is appropriate for the desired printing quality has been set or the printing plate has even been interrupted. For this reason, they are only suitable to a limited extent for checking the correct printing plate inking. -
Auch eine scheinbar ausreichende Feuchtmittelschichtdicke auf einem nicht für die Farbannahme vorgesehenen, hydrophilen Flächenelement der Druckplatte bietet keine Garantie dafür, daß dieses Flächenelement auch tatsächlich farblos bleibt. Vielmehr besteht die Gefahr, daß infolge erhöhter Verdunstung des Feuchtmittels auf diesem nicht druckenden Flächenelement trotzdem Farbe angenommen wird und dadurch die unter « Tonen bekannte, qualitätsmindernde Störung auftritt. Will man die Feuchtmittelführung optimieren und in einem engen Toleranzbereich zonenweise unter Kontrolle halten, so vermögen alle bekannten Meßeinrichtungen hierzu keine zufriedenstellende Lösung zu bieten.Even an apparently sufficient dampening solution layer thickness on a hydrophilic surface element of the printing plate which is not intended for ink acceptance does not guarantee that this surface element actually remains colorless. Rather, there is a risk that due to increased evaporation of the dampening solution on this non-printing surface element, color will nevertheless be accepted and the quality-reducing disturbance known as toning will occur. If you want to optimize the dampening solution management and keep it under control in zones within a narrow tolerance range, all known measuring devices are unable to offer a satisfactory solution.
Es ist zwar aus der JP-A-58-42463 ebenfalls eine Walze mit oleophilen und hydrophilen Oberflächen bekannt, wobei die Verteilung der beiden Oberflächenbereiche rasterförmig angelegt ist. Diese Walze dient jedoch der Farbübertragung von einer Tauchwalze auf eine weitere Walze, wobei die oleophilen Oberflächen vertieft sind und somit durch Abrakeln der Farbe die Farbauftragsmenge genau eingestellt werden kann.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. However, 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.
Obwohl sich mit der Vorrichtung der EP-A-0000689 (DE-B-27 36 663) unter Vermeidung verschiedener Nachteile des Standes der Technik ein eindeutiger Zusammenhang zwischen der Farb- bzw. Feuchtschichtdicke bereits herstellen läßt, wird jedoch auch mit dieser die partiell unterschiedliche Verdunstung des Feuchtmittels auf der Druckplatte durch örtliche Erwärmung nicht in ausreichendem Maße berücksichtigt.Although with the device of EP-A-0000689 (DE-B-27 36 663), while avoiding various disadvantages of the prior art, a clear connection between the ink or dampening layer thickness can already be established, this will also make the partially different Evaporation of the dampening solution on the printing plate due to local heating is not taken into account sufficiently.
Die Erfindung macht sich die Erkenntnis zunutze, daß sowohl Chrom- als auch Aluminiumwalzen als Verbindungswalzen zwischen Farb- und Feuchtwerk blanklaufen, d. h. bevorzugt Feuchtmittel aufnehmen und in eingefeuchtetem Zustand Farbe abstoßen.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.
Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, mit geringem Herstellungsaufwand eine einfache Kontrollvorrichtung zu schaffen, mit der sich die aus partiell unterschiedlicher Verdunstung des Feuchtmittels sowie unterschiedlichem Farbverbrauch resultierenden Schwankungen im Feuchtmittelgehalt der Druckfarbe zwecks nachfolgender Verwendung zur zonenweisen Beeinflussung der Feuchtmittelzufuhr gleichmäßig über die gesamte Maschinenbreite hinweg meßtechnisch genau erfassen lassen.Proceeding from this, 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.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die oleophilen Oberflächenbereiche rasterförmig verteilt, auf der gesamten Oberfläche der Meßwalze angeordnet sind, wobei mit der optoelektronischen Meßeinrichtung die Überdeckung des Rasters mit Farbe erfaßbar ist und das von der Meßeinrichtung gebildete Signal die Meßgröße zur Einstellung der Feuchtmittelführung darstellt.This object is achieved in that the 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 .
Durch die Wahl dieser speziellen Oberflächengestaltung kann man die Feuchtmittelführung zwecks Erzielung einer einwandfreien Druckqualität selbst in einem engen Toleranzbereich zonenweise sehr effektiv kontrollieren, da die Überdeckung des oleophilen Rasters mit Farbe stark abhängig ist von deren Feuchtmittelgehalt und sömit indirekt ein Maß für die Feuchtmittelführung darstellt. Bereits kleinste Deckungsänderungen lassen zuverlässig auf Veränderungen im Farb-Feuchtmittelgleichgewicht und somit auf ein Zuviel oder Zuwenig an Feuchtmittel schließen, wobei insbesondere die Gleichmäßigkeit der Meßergebnisse aller Farbzonen über die gesamte Breite der Maschine hinweg von besonderem Vorteil ist. Durch empirische Auswahl verschiedener Deckungsgrade des oleophilen Rasters läßt sich die Feinfühligkeit der Meßeinrichtung optimieren und dadurch eine genaue Aussage über die Feuchtmittelzufuhr erzielen.By choosing this special surface design, 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. By empirically selecting different degrees of coverage of the oleophilic grid, the sensitivity of the measuring device can be optimized and an accurate statement about the dampening solution supply can thereby be achieved.
Zur Vermeidung von unerwünschten Markierungen im Druck besteht eine bevorzugte Ausgestaltung der Erfindung darin, daß das oleophile Raster sowohl in Längsals auch in Umfangsrichtung der Meßwalze gleichmäßige Flächendeckung beliebigen Deckungsgrades aufweist.In order to avoid undesired markings in the print, 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.
In vorteilhafter Weiterbildung des Erfindungsgedankens ist das oleophile Raster als in Umfangsrichtung der Meßwalze stufenloser verlaufender Rasterkeil mit kontinuierlich von 100 % auf 0 % abnehmender Flächendeckung ausgebildet. Dies kommt einer höheren Meßempfindlichkeit der Meßwalze und somit einer besseren Differenzierung der Flächendeckung zugute, was sich in einer ebenfalls stufenlosen und genaueren Anzeige des Meßergebnisses niederschlägt.In an advantageous development of the concept of the invention, 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.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüchen 2 und 3 sowie 5 bis 7 und in der nachfolgenden Beschreibung niedergelegt.Further advantageous embodiments of the invention are set out in
Die Erfindung ist nachfolgend anhand einer in der Zeichnung dargestellten Grundausführung sowie einer Ausführungsform näher beschrieben.The invention is described below with reference to a basic embodiment shown in the drawing and an embodiment.
Es zeigt :
- Fig. 1 eine schematische Draufsicht auf eine Meßvorrichtung nach der Erfindung,
- Fig. 2 eine Seitenansicht von Fig. 1,
- Fig. 3 ausschnittsweise einen in Umfangsrichtung abgewälzten Zonenbereich einer Meßwalze der Ausführungsform,
- Fig. 4 ein Diagramm mit Darstellung der theoretischen Sensorkennlinie.
- 1 is a schematic plan view of a measuring device according to the invention,
- 2 is a side view of FIG. 1,
- 3 shows a section of a zone region of a measuring roller of the embodiment which has been rolled in the circumferential direction,
- Fig. 4 is a diagram showing the theoretical sensor characteristic.
Gemäß Fig. 1 ist an einer Farbauftragswalze 1 eines nicht dargestellen Plattenzylinders eine Meßwalze 3 angestellt. Aus Platzgründen erfolgt die Anstellung der Meßwalze 3 vorzugsweise an der letzten Farbauftragswalze 1. Die Oberfläche der Meßwalze 3 besteht aus einem Material mit hydrophilen Eigenschaften, vorzugsweise Aluminium oder Chrom. In gleicher bekannter Weise wie bei der Druckplattenherstellung wird auf der Oberfläche der Meßwalze 3 ein oleophiles Raster 4, vorzugsweise aus Kupfer oder Plattenschicht (lichtempfindliche Schicht), hergestellt. Wie in Fig. 1 angedeutet, kann die Geometrie des oleophilen Rasters 4 punkt- oder quadratförmig sein und verschiedene Flächendeckungen aufweisen, wobei die jeweils günstigste Flächendeckung empirisch ermittelt wird. Die verbleibenden Olberflächenbereiche 5 der Meßwalze 3 behalten hingegen ihren hydrophilen Charakter.1, 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. In the same known manner as in the production of printing plates, an oleophilic grid 4, preferably made of copper or plate layer (light-sensitive layer), is produced on the surface of the measuring roller 3. As indicated in FIG. 1, 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. The
Gegenüber der Meßwalze 3, vorzugsweise oberhalb derselben, ist eine opto-elektronische Meßeinrichtung 6 bekannter Bauart vorgesehen, die mit zumindest einem in Längsrichtung der Meßwalze 3 seitenverschiebbaren Sensor 7 mit diesem zugeordneter Strahlungsquelle 8 ausgerüstet ist (Fig.2). In diesem Fall ist die Meßeinrichtung 6 mit einer wahlweise auf verschiedene Zonen umschaltbaren Anzeigeeinrichtung 9 gekoppelt. Vorzugsweise ist die Meßeinrichtung 6 jedoch mit einer Vielzahl von Sensoren 7 bestückt, wobei jeder auszumessenden Zone ein eigener Sensor 7 zugeordnet ist. Bei dieser Ausführung erstreckt sich die Anzeigevorrichtung 9 über die gesamte Maschinenbreite hinweg und erlaubt eine zusammenhängende Darstellung aller Meßwerte der Flächendeckung gleichzeitig. Bauart und Funktion derartiger opto-elektronischen Meßeinrichtungen 6 sind aus dem Stand der Technik, z. B. aus der DE-AS 27 36 663, bekannt und brauchen deshalb nicht detaillierter dargestellt und näher beschrieben zu werden.Opposite the measuring roller 3, preferably above it, 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
Bei einer Ausführungsform weist das oleophile Raster 4 - wie bei der Grundausführung - in Längsrichtung der Meßwalze 3 eine gleichmäßige Flächendeckung mit einem beliebig wählbaren Deckungsgrad auf, ist jedoch in Umfangsrichtung der Meßwalze 3 mit einer ungleichmäßigen Flächendeckung mit verschiedenen Deckungsgraden versehen. Die ungleichmäßige Flächendeckung kann abgestuft sein, z. B. mit Deckungsgraden von 20, 30, 40, 50 % usw. oder als stufenloser Rasterkeil 10 mit kontinuierlich von 100 % auf 0 % abnehmender bzw. ansteigender Flächendeckung ausgebildet sein.In one embodiment, 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
Die Arbeitsweise mit der Meßvorrichtung und deren Funktionsweise werden im nachfolgenden näher erläutert.The method of operation with the measuring device and its mode of operation are explained in more detail below.
Beim Drucken wird von der Farbauftragswalze 1 Druckfarbe, auf die Meßwalze 3 übertragen. Dabei nimmt das oleophile Raster 4, die Kupferoberfläche, die Druckfarbe an und wird somit eingefärbt, während die verbleibenden hydrophilen Oberflächenbereiche 5, die Aluminium- oder Chromoberflächen, keine Farbe annehmen. Die Überdeckung des oleophilen Rasters durch die auf dieses übertragene Farbmenge ist stark von der Feuchtmittelführung, d. h. dem Feuchtmittelgehalt der Farbe abhängig. Wird z. B. die Feuchtmittelführung zu hoch eingestellt, so nimmt dadurch auch das oleophile Raster 4 weniger Farbe an. Entsprechend umgekehrt verhält es sich bei zu niedriger Feuchtmittelführung.When printing, printing ink is transferred from the inking roller 1 to the measuring roller 3. The oleophilic grid 4, the copper surface, takes on the printing ink and is thus colored, while the remaining
Mit der Meßeinrichtung 6 wird nun kontinuierlich die Überdeckung bzw. deren Änderung auf dem oleophilen Raster 4 gemessen, vorzugsweise in allen Zonen gleichzeitig. Die Meßwerte werden in an sich bekannten und deshalb nicht beschriebenen Verfahrensschritten in Anzeigesignale umgewandelt, verstärkt und anschließend in der Anzeigevorrichtung 9 in analoger oder digitaler Form dargestellt. Stattdessen ist es auch möglich, die Meßwerte unmittelbar als Stellbefehle zur direkten Ansteuerung von zonalen Stellgliedern eines Feuchtwerkes zu nutzen. Diese Überdeckung auf der Meßwalze 3 stellt ein zuverlässiges Maß für die Druckqualität dar.With the measuring device 6, 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.
Die oben erwähnte, gleichmäßig abgestufte Flächendeckung des oleophilen Rasters 4 in Umfangsrichtung der Meßwalze 3 der Ausführungsform gemäß Figur 3 ermöglicht - entsprechend der gewählten Abstufung - die meßtechnische Erfassung der Feuchtungsänderung in fein untergliederten Stufenschritten. Als besonders vorteilhaft in bezug auf eine bessere Differenzierung der Flächendeckung hat es sich dabei erwiesen, die Meßwalze 3 mit dem stufenlosen Rasterkeil 10 zu versehen. Diese Art der Rasterung ist besonders feinfühlig und sehr schnell ansprechend auf bereits geringfügige Überdeckungsänderungen.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
Im Diagramm der Figur 4 ist an der Ordinate das Sensorsignal in Abhängigkeit von der an der Abszisse aufgetragenen Überdeckung der Meßwalze 3 dargestellt. Zu Beginn des Druckprozesses, wenn das Feuchtwerk noch nicht angestellt und deshalb noch kein Wasser in die Farbe emulgiert ist, nimmt die Meßwalze 3 von der Farbauftragswalze 1 ausschließlich Druckfarbe an und wird ganz eingefärbt, so daß der oder die Sensoren 7 100 %ige Überdeckung feststellen. Das zugehörige Sensorsignal der Volltonreflexion ist mit der Bezugsziffer 11 charakterisiert.In the diagram in FIG. 4, the sensor signal is shown on the ordinate as a function of the overlap of the measuring roller 3 plotted on the abscissa. At the beginning of the printing process, when the dampening unit has not yet been switched on and therefore no water has emulsified into the ink, 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.
Nach der Druckanstellung, wenn das Feuchtwerk seine Arbeit aufgenommen hat, bildet sich im Farbwerk ein Farb/Feuchtmittelemulsion, wodurch die Meßwalze 3 sowohl Farbe als auch Feuchtmittel annimmt. Dadurch verändert sich deren Überdeckung und im selben Maße auch das Sensorsignal. Wie Figur 4 deutlich zu entnehmen ist, ist der Toleranzbereich 13 der Feuchtmittelführung durch deren obere und untere Grenzen 14 und 15 festgelegt. Der Mittelwert der Feuchtmittelführung, wenn sich die auf der Meßwalze 3 befindliche Farbe und das Feuchtmittel das Gleichgewicht halten, ist gestrichelt eingezeichnet und mit der Bezugsziffer 16 gekennzeichnet. Der der Volltonreflexion entgegengesetze Extremfall tritt dann ein, wenn beispielsweise die Meßwalze 3 wegen zu hoher Feuchtmittelführung ohne Farbe blankläuft (Punkt 12). In diesem Fall wird die von der Strahlungsquelle 8 ausgesandte Meßstrahlung auf den hydrophilen Oberflächenberei- chen 5 totalreflektiert. Die Höhe des Sensorsignals 12 dieser Totalreflexion entspricht einem Deckungsgrad der Meßwalze 3 von 0 %.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. As can be clearly seen in FIG. 4, the
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT84107564T ATE32045T1 (en) | 1983-07-23 | 1984-06-29 | DEVICE FOR ZONE-BY-ZONE MEASURING CONTROL OF THE DAMPING SOLUTION IN THE INKING UNIT OF AN OFFSET PRINTING PRESS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833326698 DE3326698A1 (en) | 1983-07-23 | 1983-07-23 | DEVICE FOR ZONE-WAY MEASURING CONTROL OF THE DAMPING AGENT IN THE PRINTING PLANT OF AN OFFSET PRINTING MACHINE |
| DE3326698 | 1983-07-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0132624A1 EP0132624A1 (en) | 1985-02-13 |
| EP0132624B1 true EP0132624B1 (en) | 1988-01-20 |
Family
ID=6204814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84107564A Expired EP0132624B1 (en) | 1983-07-23 | 1984-06-29 | Device for the zonal control of the dampness circuit in the inking unit of an offset printing machine by means of measuring techniques |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US4722274A (en) |
| EP (1) | EP0132624B1 (en) |
| JP (1) | JPS6054849A (en) |
| KR (1) | KR860000598B1 (en) |
| AT (1) | ATE32045T1 (en) |
| CA (1) | CA1221852A (en) |
| DE (2) | DE3326698A1 (en) |
| DK (1) | DK286684A (en) |
| ES (1) | ES533544A0 (en) |
| NO (1) | NO842971L (en) |
| ZA (1) | ZA844732B (en) |
Families Citing this family (15)
| 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 (en) * | 1989-04-05 | 1989-05-18 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De | |
| US5694846A (en) * | 1991-06-06 | 1997-12-09 | Baldwin Graphics Systems, Inc. | Fountain solution supply system |
| DE517462T1 (en) * | 1991-06-06 | 1993-04-29 | Baldwin Graphic Systems, Inc., Stamford, Conn., Us | FEEDING LIQUID FEEDING SYSTEM. |
| US5360399A (en) * | 1992-01-10 | 1994-11-01 | Robert Stegmann | Method and apparatus for maintaining the normal intraocular pressure |
| DE4214139C2 (en) * | 1992-04-29 | 2002-01-10 | Heidelberger Druckmasch Ag | Process for dampening solution regulation when printing from a form cylinder in an offset printing machine |
| DE4244500A1 (en) * | 1992-12-30 | 1994-07-07 | Heidelberger Druckmasch Ag | Process for supplying dampening solution |
| DE4303282C2 (en) * | 1993-02-05 | 2002-02-28 | Heidelberger Druckmasch Ag | Device for dampening solution supply in an offset printing machine |
| DE9305742U1 (en) * | 1993-04-16 | 1993-06-17 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De | |
| 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 (en) * | 2003-04-09 | 2004-11-04 | Maschinenfabrik Wifag | Roller for a printing machine and method for producing a roller |
| CN111929319B (en) * | 2020-10-14 | 2021-04-09 | 天津文洲机械有限公司 | Indirect high-precision silk screen damage visual detection machine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1303819C2 (en) * | 1964-05-29 | 1973-07-12 | DEVICE FOR MEASURING A COATING THICKNESS ON SURFACES | |
| US3756725A (en) * | 1970-10-12 | 1973-09-04 | Harris Intertype Corp | Measurement and control of ink density |
| DE2214721B1 (en) * | 1972-03-25 | 1973-06-14 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | PROCESS AND DEVICE FOR AUTOMATIC ADJUSTMENT OF FLUCTUATIONS IN THE PAINT AND MOISTURE FLUID ON OFFSET MACHINES |
| DE2736663C3 (en) * | 1977-08-13 | 1985-05-15 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Device for determining the moisture and color balance in offset printing units |
| DD157779A1 (en) * | 1980-10-06 | 1982-12-08 | Hans Johne | METHOD AND DEVICE FOR THE OPTIMUM ADMISSION OF THE WETTING AGENT |
| DE3220282C3 (en) * | 1982-05-28 | 1995-05-18 | Roland Man Druckmasch | Device for operationally recording a measure of the amount of dampening solution on the rotating printing plate in offset printing machines |
-
1983
- 1983-07-23 DE DE19833326698 patent/DE3326698A1/en not_active Ceased
-
1984
- 1984-06-04 KR KR1019840003100A patent/KR860000598B1/en not_active IP Right Cessation
- 1984-06-07 CA CA000456050A patent/CA1221852A/en not_active Expired
- 1984-06-12 DK DK286684A patent/DK286684A/en not_active Application Discontinuation
- 1984-06-19 ES ES533544A patent/ES533544A0/en active Granted
- 1984-06-21 ZA ZA844732A patent/ZA844732B/en unknown
- 1984-06-29 DE DE8484107564T patent/DE3468837D1/en not_active Expired
- 1984-06-29 AT AT84107564T patent/ATE32045T1/en not_active IP Right Cessation
- 1984-06-29 EP EP84107564A patent/EP0132624B1/en not_active Expired
- 1984-07-20 NO NO842971A patent/NO842971L/en unknown
- 1984-07-23 JP JP59151451A patent/JPS6054849A/en active Granted
-
1986
- 1986-02-14 US US06/830,063 patent/US4722274A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DK286684D0 (en) | 1984-06-12 |
| ATE32045T1 (en) | 1988-02-15 |
| DE3326698A1 (en) | 1985-02-07 |
| ZA844732B (en) | 1985-02-27 |
| JPH0339459B2 (en) | 1991-06-13 |
| NO842971L (en) | 1985-01-24 |
| DE3468837D1 (en) | 1988-02-25 |
| EP0132624A1 (en) | 1985-02-13 |
| ES8502911A1 (en) | 1985-02-16 |
| CA1221852A (en) | 1987-05-19 |
| JPS6054849A (en) | 1985-03-29 |
| ES533544A0 (en) | 1985-02-16 |
| KR850001087A (en) | 1985-03-14 |
| DK286684A (en) | 1985-01-24 |
| KR860000598B1 (en) | 1986-05-22 |
| US4722274A (en) | 1988-02-02 |
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