EP3882033B1 - Method for washing an inking system of a printing press - Google Patents
Method for washing an inking system of a printing press Download PDFInfo
- Publication number
- EP3882033B1 EP3882033B1 EP20164113.1A EP20164113A EP3882033B1 EP 3882033 B1 EP3882033 B1 EP 3882033B1 EP 20164113 A EP20164113 A EP 20164113A EP 3882033 B1 EP3882033 B1 EP 3882033B1
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- EP
- European Patent Office
- Prior art keywords
- roller
- washing
- control
- inking unit
- rotary speed
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- 238000005406 washing Methods 0.000 title claims description 33
- 238000000034 method Methods 0.000 title claims description 17
- 238000007639 printing Methods 0.000 title claims description 15
- 238000012544 monitoring process Methods 0.000 claims 4
- 230000004913 activation Effects 0.000 claims 1
- 239000003599 detergent Substances 0.000 description 26
- 230000002093 peripheral effect Effects 0.000 description 12
- 239000000839 emulsion Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F35/00—Cleaning arrangements or devices
- B41F35/04—Cleaning arrangements or devices for inking rollers
Definitions
- the present invention relates to a method for washing an inking unit of a printing press, a washing agent being introduced into the inking unit and a roller of the inking unit being driven only by roller friction.
- EP 1 441 908 B1 it is proposed to apply the liquid to a roller in such a small amount per unit of time that non-wetting zones extend from this roller to the lateral surface contact with an adjacent roller, so that sufficient frictional resistance for rotational entrainment is ensured between the two rollers.
- the object of the invention is to specify a further method for washing an inking unit of a printing press.
- the object is achieved by a method for washing an inking unit of a printing press, a detergent being introduced into the inking unit and a roller of the inking unit being driven only via roller friction, characterized in that the speed of the roller is monitored by a sensor of a controller and that the introduction of the detergent is reduced or suspended by the controller if the controller detects that the speed has fallen below a limit value.
- the advantage of the invention is that it improves the operational reliability of the printing machine.
- a monitoring program can run in the controller, which evaluates the values of the rotational speed of the roller and, depending on this, regulates the introduction of the detergent.
- the monitoring program can regulate the switching of a squeegee device.
- a wash program runs in the controller and is only ended by the monitoring program when the monitoring program determines that the detergent has been removed from the inking unit again to a sufficient extent by the squeegee device.
- An initialization run of the printing press can be carried out to adjust the speed of the roller and another speed of the printing press.
- the limit value can be varied by the controller or an operator depending on an ink used and/or the detergent used and/or another operating condition.
- the wash program can be selected from various wash programs programmed in the controller. The course of the washing program can be displayed on a monitor.
- a sensor integrated in a roller lock of the roller can be used as the sensor.
- a capacitive sensor can be used as the sensor.
- the only figure shows an inking unit with which the method according to the invention is carried out.
- a printing press includes an offset printing unit with a printing forme cylinder 10, a dampening unit for applying a dampening solution to the printing forme cylinder 10 and an inking unit for applying the ink to the printing forme cylinder 10.
- the inking unit includes rollers 3, 7, each of which has a gear wheel via which they are driven. Between the form-fittingly driven rollers 3, 7, rollers 4, 9 which follow the rollers and do not have a gear wheel are arranged therewith. The rotation of the rollers 4, 9 is driven in a frictionally engaged manner by the rollers 3, 7 resting against them.
- Each roller 4, 9 sits in a roller lock 11, 12, in which a sensor 2, 8 for measuring the Speed of the respective roller 4, 9 is arranged.
- the sensors 2, 8 are capacitive proximity sensors and detect a rotating component attached to the roller 4, 9 as a marking, for example a pin.
- the sensors 2, 8 are connected to an electronic control 5, to which a monitor 13 belongs.
- the feed device 1 which introduces the detergent into the inking unit when it is being washed.
- the feed device 1 is a spray device and is aimed at the gap between the rollers 3 and 4 .
- the detergent introduced into the inking unit forms an emulsion with the remaining color therein, which is removed from the inking unit by a squeegee device 6 .
- the squeegee device 6 is temporarily held in contact with the roller 7 .
- the feed device 1 and the squeegee device 6 are controlled by the controller 5 as a function of a washing program running therein.
- the washing program is divided into a first prewash section and a second main wash section.
- Deposits e.g. consisting of pigments, paper fibres, paper coating, are dissolved during the pre-wash.
- detergent is introduced into the inking unit at specific intervals of e.g.
- a pump supplying the feed device 1 with the detergent can perform six pump strokes. The amount of detergent used during the pre-wash is still so small that there are no problems (dripping, splashing) caused by overdosing.
- the squeegee device 6 is turned on to the roller 7 and the detergent is introduced into the inking unit at certain intervals by pumping and spraying.
- the emulsion that forms is drawn off from the inking unit via the squeegee device 6 .
- the wash program ends. Wash sequences are also conceivable in which the program sections of the pre-wash and the main wash are repeated several times in alternation.
- a monitoring program runs in the controller 5, which influences or controls the washing program as a function of the measured values signaled by the sensors 2, 8.
- Various limit values for the speeds or for the peripheral speeds of the rollers 4, 9 corresponding thereto are contained in the monitoring program.
- This speed limit prevents detergent from being repeatedly sprayed into an incoming roller gap but not being transported away because the transport speed is insufficient.
- the program thus monitors whether an actual value of the speed or peripheral speed of the respective roller 4, 9 during washing is greater than or just as great as a predetermined limit value for this speed or peripheral speed.
- the limit value for the pre-wash is a variable setting value which can be varied to adapt the speed limit to the operational boundary conditions (color used, detergent, roller material). Preferably the limit is between 20% and 40% of the wash speed.
- the monitoring program also includes a limit value for the main wash program section.
- a minimum peripheral speed of the rollers 4, 9 must be reached in order for the detergent to be supplied. If the actual value of the peripheral speed of the rollers 4, 9 falls below this limit during washing, the detergent supply is suspended during the main wash and only carried out again when the speed is sufficient to transfer the detergent (detergent emulsion).
- the monitoring program monitors the regulation as to whether the actual value of the peripheral speed of the respective roller 4, 9 during washing is greater than or equal to the limit value of the peripheral speed of this Roller 4, 9 is in the wash. This speed limit prevents detergent from being repeatedly sprayed into the incoming roller gap but not being transported away because the transport speed is insufficient. The insufficient transport speed can be caused by a lack of friction due to incorrect contact strip widths or color properties.
- a third limit value, which the monitoring program contains, is a speed limit for shutting down the wash blade.
- a speed limit for shutting down the wash blade In order to ensure a good washing result, there must be no more washing emulsion in the inking unit when the machine is switched off. If, towards the end of the washing process, the speeds (actual values of the peripheral speed during washing) of the measuring rollers (rollers 4, 9) are still below the target speed, then it can be assumed that there is still washing emulsion in the inking unit and the friction conditions are still disturbed . In order to ensure that unwanted liquid residues are safely removed, the squeegee device 6 may only be switched off from the roller 7 when the sensors 2, 8 signal that the washing speed (target value of the circumferential speed during washing) on the rollers 4, 9 is again present.
- the machine operator has the monitor 13 available as a display, which shows him the conditions present in the inking unit.
- the operator is shown a graphic on the screen of the control point, which shows the course of the roller speed at the measuring points and compares them to the set limit values.
- Various values are displayed on the screen for information, including the current program section, the target wash time and the remaining wash time of the current wash program.
- the control system automatically suspends the introduction of detergent, the following values are displayed: The additional time extension of the washing program and the number of detergent feeds (pump strokes) that have been suspended so far. If the course of the roller speed remains below the speed limit for a conspicuously long time, the operator can take appropriate measures based on the information and visualizations available to him in order to improve the washing process.
- the possible measures can include, for example: adjust the degree of wetness of the program (vary the interval of the pump strokes), check the suitability of the detergent, check the roller adjustment, check the condition of the roller surfaces and check the squeegee device 6 function.
- the rollers 4, 9 are rubber-covered rollers, the diameter of which can vary within the scope of manufacturing tolerances and can change due to operational reasons. For example, the diameter can change due to aging and wear of the roller 4,9. Both enlargements (swelling) and reductions (shrinkage) can occur.
- the changes can be up to ⁇ 5% and are therefore relevant for the evaluation of the limit values by the monitoring program, in particular with regard to the query whether the target value of the peripheral speed of the roller 4, 9 has been reached again during washing and therefore the doctor device 6 from the roller 7 can be turned off again. If the target value is reached, this means that the slippage has been sufficiently reduced and the washing emulsion has been removed from the inking unit to a sufficient extent.
- the measured roller speed is reduced as a result of the extended peripheral development.
- the roller 4, 9 runs without slipping, the difference between its measured speed (or the peripheral speed corresponding thereto) and the target value of the peripheral speed during washing is evaluated as overrun or slip.
- the controller 5 carries out an initialization run according to the program at certain time intervals, in which the true speed of the rollers 4, 9 is determined in relation to the machine speed and automatically stored.
- the roller speed must match within specified tolerances in order to ensure synchronization that is sufficiently accurate in practice.
Description
Vorliegende Erfindung betrifft ein Verfahren zum Waschen eines Farbwerks einer Druckmaschine, wobei ein Waschmittel in das Farbwerk eingebracht wird und eine Walze des Farbwerks nur über Walzenfriktion angetrieben wird.The present invention relates to a method for washing an inking unit of a printing press, a washing agent being introduced into the inking unit and a roller of the inking unit being driven only by roller friction.
Wenn beim Waschen des Farbwerks in dieses zu viel Waschmittel gegeben wird, besteht die Gefahr, dass aufgrund einer Art Aquaplaning-Effekt nicht über Zahnräder, sondern Umfangsreibung angetriebene Walzen rutschen und sogar stehen bleiben.If too much detergent is added to the inking unit when washing it, there is a risk that, due to a kind of aquaplaning effect, rollers driven not by gears but by circumferential friction will slip and even come to a standstill.
In
Weiteren Stand der Technik beinhalten
Aufgabe der Erfindung ist, ein weiteres Verfahren zum Waschen eines Farbwerks einer Druckmaschine anzugeben.The object of the invention is to specify a further method for washing an inking unit of a printing press.
Die Aufgabe wird gelöst durch ein Verfahren zum Waschen eines Farbwerks einer Druckmaschine, wobei ein Waschmittel in das Farbwerk eingebracht wird und eine Walze des Farbwerks nur über Walzenfriktion angetrieben wird, dadurch gekennzeichnet, dass die Drehzahl der Walze durch einen Sensor einer Steuerung überwacht wird und dass durch die Steuerung das Einbringen des Waschmittels verringert oder ausgesetzt wird, wenn die Steuerung eine Unterschreitung eines Grenzwerts der Drehzahl feststellt.The object is achieved by a method for washing an inking unit of a printing press, a detergent being introduced into the inking unit and a roller of the inking unit being driven only via roller friction, characterized in that the speed of the roller is monitored by a sensor of a controller and that the introduction of the detergent is reduced or suspended by the controller if the controller detects that the speed has fallen below a limit value.
Vorteil der Erfindung ist, dass dadurch die Betriebssicherheit der Druckmaschine verbessert wird.The advantage of the invention is that it improves the operational reliability of the printing machine.
Es sind verschiedene Weiterbildungen des erfindungsgemäßen Verfahrens möglich. In der Steuerung kann ein Überwachungsprogramm ablaufen, welches Werte der Drehzahl der Walze auswertet und in Abhängigkeit davon das Einbringen des Waschmittels regelt. Das Überwachungsprogramm kann das Schalten einer Rakeleinrichtung regeln. Es kann vorgesehen sein, dass in der Steuerung ein Waschprogramm abläuft und dieses durch das Überwachungsprogramm erst dann beendet wird, wenn das Überwachungsprogramm feststellt, dass das Waschmittel in hinreichendem Maß durch die Rakeleinrichtung aus dem Farbwerk wieder entfernt worden ist. Ein Initialisierungslauf der Druckmaschine kann zum Abgleich der Drehzahl der Walze und einer anderen Drehzahl der Druckmaschine durchgeführt werden. Von der Steuerung oder einem Bediener kann der Grenzwert in Abhängigkeit von einer verwendeten Druckfarbe und/oder dem verwendeten Waschmittel und/oder einer anderen Betriebsbedingung variiert werden. Das Waschprogramm kann aus verschiedenen Waschprogrammen ausgewählt werden, die in der Steuerung programmiert sind. Auf einem Monitor kann der Ablauf des Waschprogramms dargestellt werden. Als der Sensor kann ein in ein Walzenschloss der Walze integrierter Sensor verwendet werden. Als der Sensor kann ein kapazitiver Sensor verwendet werden.Various developments of the method according to the invention are possible. A monitoring program can run in the controller, which evaluates the values of the rotational speed of the roller and, depending on this, regulates the introduction of the detergent. The monitoring program can regulate the switching of a squeegee device. It can be provided that a wash program runs in the controller and is only ended by the monitoring program when the monitoring program determines that the detergent has been removed from the inking unit again to a sufficient extent by the squeegee device. An initialization run of the printing press can be carried out to adjust the speed of the roller and another speed of the printing press. The limit value can be varied by the controller or an operator depending on an ink used and/or the detergent used and/or another operating condition. The wash program can be selected from various wash programs programmed in the controller. The course of the washing program can be displayed on a monitor. A sensor integrated in a roller lock of the roller can be used as the sensor. A capacitive sensor can be used as the sensor.
Weiterbildungen ergeben sich auch aus der nachfolgenden Beschreibung von Ausführungsbeispielen und der zugehörigen Zeichnung.Further developments also result from the following description of exemplary embodiments and the associated drawing.
Deren einzige Figur zeigt ein Farbwerk, mit dem das erfindungsgemäße Verfahren durchgeführt wird.The only figure shows an inking unit with which the method according to the invention is carried out.
Eine Druckmaschine umfasst ein Offset-Druckwerk mit einem Druckformzylinder 10, einem Feuchtwerk zum Aufbringen eines Feuchtmittels auf den Druckformzylinder 10 und einem Farbwerk zum Aufbringen der Farbe auf den Druckformzylinder 10. Das Farbwerk umfasst Walzen 3, 7, welche jeweils ein Zahnrad aufweisen, über das sie angetrieben werden. Zwischen den formschlüssig angetriebenen Walzen 3, 7 sind mit diesen mitlaufende Walzen 4, 9 angeordnet, die kein Zahnrad aufweisen. Die Rotation der Walzen 4, 9 wird von den daran anliegenden Walzen 3, 7 reibschlüssig angetrieben. Jede Walze 4, 9 sitzt in einem Walzenschloss 11, 12, in welchem ein Sensor 2, 8 zum Messen der Drehzahl der jeweiligen Walze 4, 9 angeordnet ist. Die Sensoren 2, 8 sind kapazitive Näherungssensoren und erfassen ein an der Walze 4, 9 als Markierung angebrachtes, rotierendes Bauteil, z.B. einen Stift. Die Sensoren 2, 8 sind mit einer elektronischen Steuerung 5 verbunden, zu der ein Monitor 13 gehört.A printing press includes an offset printing unit with a
Es ist eine Zuführeinrichtung 1 vorhanden, die beim Waschen des Farbwerks in dieses das Waschmittel einbringt. Die Zuführeinrichtung 1 ist eine Sprüheinrichtung und auf den Spalt zwischen den Walzen 3 und 4 gerichtet. Beim Waschen bildet das ins Farbwerk eingebrachte Waschmittel mit der darin befindlichen Restfarbe eine Emulsion, die durch eine Rakeleinrichtung 6 aus dem Farbwerk entfernt wird. Die Rakeleinrichtung 6 wird dazu temporär an die Walze 7 angestellt gehalten. Die Zuführeinrichtung 1 und die Rakeleinrichtung 6 werden von der Steuerung 5 in Abhängigkeit von einem darin ablaufenden Waschprogramm angesteuert. Das Waschprogramm ist in einen ersten Abschnitt der Vorwäsche und einen zweiten Abschnitt der Hauptwäsche unterteilt.There is a feed device 1 which introduces the detergent into the inking unit when it is being washed. The feed device 1 is a spray device and is aimed at the gap between the
Bei der Vorwäsche werden Ablagerungen, z.B. bestehend aus Pigmenten, Papierfasern, Papierstrich, angelöst. Dafür wird in bestimmten Abständen von z.B. zehn Maschinenumdrehungen (Umdrehungen des Druckformzylinders 10) in das Farbwerk Waschmittel eingebracht, welches sich gleichmäßig verteilen soll, um einzuwirken. Während der Vorwäsche können z.B. sechs Pumpenhübe einer die Zuführeinrichtung 1 mit dem Waschmittel versorgenden Pumpe erfolgen. Die während der Vorwäsche eingebrachte Waschmittelmenge ist noch so gering, dass keine Probleme (Abtropfen, Spritzen) durch Überdosierung zu befürchten sind.Deposits, e.g. consisting of pigments, paper fibres, paper coating, are dissolved during the pre-wash. For this purpose, detergent is introduced into the inking unit at specific intervals of e.g. During the pre-wash, for example, a pump supplying the feed device 1 with the detergent can perform six pump strokes. The amount of detergent used during the pre-wash is still so small that there are no problems (dripping, splashing) caused by overdosing.
Mit Beginn der Hauptwäsche wird die Rakeleinrichtung 6 an die Walze 7 angestellt und wird in bestimmten Abständen durch Pumpen und Sprühen das Waschmittel in das Farbwerk eingebracht. Die sich dabei bildende Emulsion wird über die Rakeleinrichtung 6 aus dem Farbwerk abgezogen. Nach einer festgelegten Anzahl von Maschinenumdrehungen und Pumpenhüben wird das Waschprogramm beendet. Denkbar sind auch Waschabläufe, bei denen sich die Programmabschnitte der Vorwäsche und der Hauptwäsche mehrfach abwechselnd wiederholen.At the beginning of the main wash, the
In der Steuerung 5 läuft ein Überwachungsprogramm ab, welches in Abhängigkeit von den durch die Sensoren 2, 8 signalisierten Messwerte das Waschprogramm beeinflusst bzw. steuert. In dem Überwachungsprogramm sind verschiedene Grenzwerte für die Drehzahlen bzw. für die damit korrespondierenden Umfangsgeschwindigkeiten der Walzen 4, 9 enthalten.A monitoring program runs in the
Dazu zählt ein Grenzwert für den Programmabschnitt Vorwäsche, durch welchen die Geschwindigkeitsgrenze (Schlupfgrenze), für das Zuführen von Waschmittel während der Vorwäsche definiert ist. Wird diese Grenze durch die beim Waschen sensorisch erfasste Ist-Geschwindigkeit unterschritten, dann werden die Zuführvorgänge während der Vorwäsche ausgesetzt und erst dann wieder ausgeführt, wenn eine ausreichende Drehzahl der Walzen 4, 9 vorliegt, um das Waschmittel (Waschemulsion) zu übertragen. Mit dieser Geschwindigkeitsgrenze wird verhindert, dass wiederholt Waschmittel in einen einlaufenden Walzenspalt gesprüht wird, jedoch nicht abtransportiert werden kann, da keine ausreichende Transportdrehzahl vorliegt. Das Programm überwacht also, ob ein Ist-Wert der Drehzahl oder Umfangsgeschwindigkeit der jeweiligen Walze 4, 9 beim Waschen größer als oder genauso groß wie ein vorgegebener Grenzwert dieser Drehzahl oder Umfangsgeschwindigkeit ist. Der Grenzwert für die Vorwäsche ist ein variabler Einstellwert, welcher zur Anpassung der Geschwindigkeitsgrenze an die betriebsbedingten Randbedingungen (verwendete Farbe, Waschmittel, Walzenmaterial) variiert werden kann. Vorzugsweise liegt der Grenzwert zwischen 20% und 40% der Waschgeschwindigkeit.This includes a limit value for the pre-wash program section, which defines the speed limit (slip limit) for the supply of detergent during the pre-wash. If the actual speed detected by sensors during washing falls below this limit, the feeding processes are suspended during the prewash and only carried out again when the
Weiterhin beinhaltet das Überwachungsprogramm einen Grenzwert für den Programmabschnitt Hauptwäsche. Mit Beginn der Hauptwäsche und dem Anstellen der Rakeleinrichtung 6 muss eine Mindestumfangsgeschwindigkeit der Walzen 4, 9 erreicht sein, damit die Waschmittelzuführung ausgeführt wird. Wird diese Grenze durch den Ist-Wert der Umfangsgeschwindigkeit der Walzen 4, 9 beim Waschen unterschritten, dann wird die Waschmittelzuführung während der Hauptwäsche ausgesetzt und erst wieder ausgeführt, wenn eine ausreichende Drehzahl vorliegt, um das Waschmittel (Waschemulsion) zu übertragen. Das Überwachungsprogramm überwacht die Vorschrift, ob der Ist-Wert der Umfangsgeschwindigkeit der jeweiligen Walze 4, 9 beim Waschen größer als oder genauso groß wie der Grenzwert der Umfangsgeschwindigkeit dieser Walze 4, 9 beim Waschen ist. Durch diese Geschwindigkeitsgrenze wird verhindert, dass wiederholt Waschmittel in den einlaufenden Walzenspalt gesprüht wird, jedoch nicht abtransportiert werden kann, da keine ausreichende Transportdrehzahl vorliegt. Die unzureichende Transportgeschwindigkeit kann durch mangelnde Friktion aufgrund von falschen Kontaktstreifenbreiten oder Farbeigenschaften verursacht werden.The monitoring program also includes a limit value for the main wash program section. At the start of the main wash and when the
Ein dritter Grenzwert, welchen das Überwachungsprogramm beinhaltet, ist eine Geschwindigkeitsgrenze für das Abstellen der Waschrakel. Um ein gutes Waschergebnis sicherzustellen, darf beim Abstellen keine Waschemulsion mehr im Farbwerk sein. Wenn gegen Ende des Waschablaufs die Drehzahlen (Ist-Werte der Umfangsgeschwindigkeit beim Waschen) der Messwalzen (Walzen 4, 9) noch unterhalb der Soll-Drehzahl liegen, dann ist davon auszugehen, dass sich noch Waschemulsion im Farbwerk befindet und die Friktionsverhältnisse noch gestört sind. Um sicherzustellen, dass unerwünschte Flüssigkeitsreste sicher entfernt sind, darf die Rakeleinrichtung 6 erst dann von der Walze 7 abgestellt werden, wenn die Sensoren 2, 8 signalisieren, dass an den Walzen 4, 9 wieder die Waschgeschwindigkeit (Soll-Wert der Umfangsgeschwindigkeit beim Waschen) vorliegt.A third limit value, which the monitoring program contains, is a speed limit for shutting down the wash blade. In order to ensure a good washing result, there must be no more washing emulsion in the inking unit when the machine is switched off. If, towards the end of the washing process, the speeds (actual values of the peripheral speed during washing) of the measuring rollers (
Um an der Steuerung 5 praxisrelevante Werte für die Grenzgeschwindigkeiten im Überwachungsprogramm einstellen zu können, steht dem Maschinenbediener der Monitor 13 als Anzeige zur Verfügung, die ihm die im Farbwerk vorliegenden Verhältnisse anzeigt. Dabei wird dem Bediener auf dem Bildschirm der Bedienstelle eine Grafik angezeigt, die den Verlauf der Walzengeschwindigkeit an den Messstellen darstellt und diese im Bezug zu den eingestellten Grenzwerten setzt. Auf dem Bildschirm werden zur Information verschiedene Werte angezeigt, darunter der laufende Programmabschnitt, die Soll-Waschzeit und die verbleibende Rest-Waschzeit des laufenden Waschprogramms.In order to be able to set practice-relevant values for the limit speeds in the monitoring program on the
Falls eine Grenzgeschwindigkeit unterschritten wird und dadurch das Einbringen von Waschmittel durch die Steuerung automatisch ausgesetzt wird, werden folgende Werte angezeigt: Die zusätzliche zeitlich Verlängerung des Waschprogramms und die Anzahl der bislang ausgesetzten Waschmittelzuführungen (Pumpenhübe). Wenn der Verlauf der Walzengeschwindigkeit auffällig lange unterhalb der Geschwindigkeitsgrenze bleibt, kann der Bediener anhand der ihm vorliegenden Angaben und Visualisierungen entsprechende Maßnahmen treffen, um den Waschablauf zu verbessern. Die möglichen Maßnahmen können z.B. umfassen: Den Nässegrad des Programms anpassen (Intervall der Pumpenhübe variieren), die Eignung des Waschmittels prüfen, die Walzenjustage prüfen, den Zustand der Walzenoberflächen prüfen und die Funktion der Rakeleinrichtung 6 prüfen.If the speed falls below a limit and the control system automatically suspends the introduction of detergent, the following values are displayed: The additional time extension of the washing program and the number of detergent feeds (pump strokes) that have been suspended so far. If the course of the roller speed remains below the speed limit for a conspicuously long time, the operator can take appropriate measures based on the information and visualizations available to him in order to improve the washing process. The possible measures can include, for example: adjust the degree of wetness of the program (vary the interval of the pump strokes), check the suitability of the detergent, check the roller adjustment, check the condition of the roller surfaces and check the
Wenn der Bediener feststellt, dass der Grenzwert zu niedrig gewählt ist, kann er diesen erhöhen, um durch ein vorgezogenes bzw. früheres Aussetzen der Waschmittelzuführung eine bessere Waschmittelverteilung und einen verbesserten Abtransport zu bewirken.If the operator finds that the limit value selected is too low, he can increase it in order to bring about better detergent distribution and improved removal by suspending the detergent supply earlier or earlier.
Die Walzen 4, 9 sind gummibezogene Walzen, deren Durchmesser im Rahmen der Fertigungstoleranzen unterschiedlich sein kann und sich betriebsbedingt verändern kann. Beispielsweise kann der Durchmesser sich aufgrund der Alterung und des Verschleißes der Walze 4, 9 ändern. Es können sowohl Vergrößerungen (Quellungen) als auch Verkleinerungen (Schrumpfungen) auftreten. Die Veränderungen können bis zu ± 5% betragen und sind somit für die Bewertung der Grenzwerte durch das Überwachungsprogramm relevant, insbesondere hinsichtlich der Abfrage, ob der Soll-Wert der Umfangsgeschwindigkeit der Walze 4, 9 beim Waschen wieder erreicht ist und deshalb die Rakeleinrichtung 6 von der Walze 7 wieder abgestellt werden kann. Wenn der Soll-Wert erreicht ist, bedeutet dies, dass der Schlupf hinreichend reduziert ist und somit die Waschemulsion in hinreichendem Maße aus dem Farbwerk entfernt worden ist. Bei einer stark vergrößerten Walze 4 oder 9 reduziert sich durch die verlängerte Umfangsabwicklung die gemessene Walzendrehzahl. Obwohl die Walze 4, 9 schlupffrei läuft, wird die Differenz zwischen ihrer gemessenen Drehzahl (bzw. der damit korrespondierenden Umfangsgeschwindigkeit) zum Soll-Wert der Umfangsgeschwindigkeit beim Waschen als Nachlauf bzw. Schlupf bewertet. Um das zu vermeiden, führt die Steuerung 5 programmgemäß in bestimmten zeitlichen Abständen einen Initialisierungslauf durch, bei welchem die wahre Drehzahl der Walzen 4, 9 im Verhältnis zur Maschinendrehzahl ermittelt und automatisch abgespeichert wird. Die Übereinstimmung der Walzendrehzahl muss innerhalb vorgegebener Toleranzen liegen, um eine für die Praxis hinreichend genaue Synchronisierung zu gewährleisten.The
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- Zuführeinrichtungfeeding device
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- Sensorsensor
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- Walzeroller
- 44
- Walzeroller
- 55
- Steuerungsteering
- 66
- Rakeleinrichtungsqueegee device
- 77
- Walzeroller
- 88th
- Sensorsensor
- 99
- Walzeroller
- 1010
- Druckformzylinderplate cylinder
- 1111
- Walzenschlossroller lock
- 1212
- Walzenschlossroller lock
- 1313
- Monitormonitor
Claims (10)
- Method of washing an inking unit in a printing press wherein a washing agent is introduced into the inking unit and a roller (4, 9) of the inking unit is driven exclusively by roller friction,
characterized
in that the rotary speed of the roller (4, 9) is monitored by a sensor (2, 8) of a control (5) and in that the control (5) reduces or stops the introduction of the washing agent when the control (5) realizes that the rotary speed drops below a rotary speed threshold. - Method according to claim 1,
characterized
in that a monitoring programme runs on the control (5), the monitoring programme analyzing the rotary speed values of the roller (4, 9) and controlling the introduction of the washing agent as a function thereof. - Method according to claim 2,
characterized
in that the monitoring programme controls the activation of a doctor blade device (6). - Method according to claim 3,
characterized
in that a washing programme (5) runs on the control unit and is not terminated by the monitoring programme until the latter finds that the washing agent has been removed from the inking unit to a sufficient extent by the doctor blade device (6). - Method according to any one of claims 1 to 4,
characterized
in that an initialization run of the printing press is carried out to compare the rotary speed of the roller (4, 9) and another rotary speed of the printing press. - Method according to any one of claims 1 to 5,
characterized
in that the control or an operator varies the threshold as a function of a utilized printing ink and/or of the utilized washing agent and/or of another operating condition. - Method according to any one of claims 4 to 6,
characterized
in that the washing programme is selected form various washing programmes programmed into the control (5). - Method according to any one of claims 4 to 7,
characterized
in that the sequence of operations of the washing programme is represented on a monitor (13). - Method according to any one of claims 1 to 8,
characterized
in that the sensor (2, 8) which is utilized is a sensor integrated into a roller lock (11, 12) of the roller (4, 9). - Method according to any one of claims 1 to 9,
characterized
in that the sensor (2, 8) which is utilized is a capacitive sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20164113.1A EP3882033B1 (en) | 2020-03-19 | 2020-03-19 | Method for washing an inking system of a printing press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20164113.1A EP3882033B1 (en) | 2020-03-19 | 2020-03-19 | Method for washing an inking system of a printing press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3882033A1 EP3882033A1 (en) | 2021-09-22 |
| EP3882033B1 true EP3882033B1 (en) | 2022-03-30 |
Family
ID=69846275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20164113.1A Active EP3882033B1 (en) | 2020-03-19 | 2020-03-19 | Method for washing an inking system of a printing press |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP3882033B1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2837330B2 (en) | 1992-12-28 | 1998-12-16 | 株式会社桜井グラフィックシステムズ | Printing machine ink cleaning equipment |
| DE29807386U1 (en) * | 1998-04-23 | 1998-08-06 | Roland Man Druckmasch | Inking unit for a sheetfed offset press |
| DE10153968A1 (en) | 2001-11-06 | 2003-05-22 | Baldwin Germany Gmbh | Press roll cleaning process and device |
| JP2009202472A (en) * | 2008-02-28 | 2009-09-10 | Mitsubishi Heavy Ind Ltd | Roller device for printing machine, printing machine, and washing method for printing machine |
| DE102013213059A1 (en) | 2012-07-06 | 2014-01-09 | Koenig & Bauer Aktiengesellschaft | Cleaning fluid applying and metering device for contact rollers of rolling train in inking unit of rotary printing machine, has feed device for feeding cleaning fluid to rolling train having roller driven by friction of another roller |
-
2020
- 2020-03-19 EP EP20164113.1A patent/EP3882033B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3882033A1 (en) | 2021-09-22 |
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