EP3016805B1 - Method and device for mutual throwing on of two cylinders in a printing press - Google Patents

Method and device for mutual throwing on of two cylinders in a printing press Download PDF

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Publication number
EP3016805B1
EP3016805B1 EP14736785.8A EP14736785A EP3016805B1 EP 3016805 B1 EP3016805 B1 EP 3016805B1 EP 14736785 A EP14736785 A EP 14736785A EP 3016805 B1 EP3016805 B1 EP 3016805B1
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EP
European Patent Office
Prior art keywords
cylinder
value
rotation
measured variable
positioning
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EP14736785.8A
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German (de)
French (fr)
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EP3016805A1 (en
Inventor
Rainer Ehrenberg
Uwe HÖWELMEYER
Mario FRANKENBERG
Wolfgang Sprehe
Frank Gunschera
Frank Westhof
Martin Krümpelmann
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Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0072—Devices for measuring the pressure between cylinders or bearer rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/004—Electric or hydraulic features of drives
    • B41F13/0045—Electric driving devices
    • 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
    • B41F13/26—Arrangement of cylinder bearings
    • B41F13/30—Bearings mounted on sliding supports
    • 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
    • B41F13/34—Cylinder lifting or adjusting devices
    • B41F13/38—Cylinder lifting or adjusting devices electrically or magnetically operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/02—Arrangements of indicating devices, e.g. counters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing

Definitions

  • the invention relates to a method and apparatus for mutual adjustment of two cylinders in a printing press.
  • the cylinders involved in a flexographic printing process and in a flexographic printing machine on the printing process must be made very close to each other in order to ensure the optimal color transfer mentioned above. This is due to the fact that in flexographic printing the printing areas are raised compared to the non-printing areas of a printed image.
  • the print jobs on a printing press change relatively frequently, which is usually accompanied by the change of at least the printing plates or the cylinder components on which they are mounted. This often also changes the print length, d. H. the circumference of the cylinders.
  • the optimum setting position must be determined using a positioning method. A great desire is to produce as little waste as possible.
  • the two cylinders which preferably have at each of its ends an adjusting device which comprise at least bearing blocks and actuators, gradually approached each other.
  • the respective setting position whose optimum value is to be determined yes, is determined in each case and also stored.
  • the two cylinders rotate by the influence of drives.
  • the peripheral speeds of the two cylinders are different.
  • the one measured variable of at least one of the two cylinders is permanently measured and their values are measured and stored.
  • the rotational speed of the cylinder is a suitable measure.
  • Another suitable measure is the braking force.
  • the measured variable initially has a substantially constant basic value, which can be referred to as the initial value.
  • the EP 1 018 426 A1 discloses a very similar method.
  • the EP 2 085 223 A1 shows a further method for employment of second cylinder, wherein the cylinders are kept in constant contact and during a test drive, which lasts a complete printing cylinder revolution, the setting position is measured and recorded.
  • the largest setting position ie the largest measured distance between the impression cylinder and impression cylinder, is now considered to be the optimum printing position.
  • the object of the present invention is therefore to propose a method and a device with which the finding of the optimum setting position of two cylinders can be accelerated.
  • this object is achieved on the basis of the above-mentioned features by the features of the characterizing part of claim 1. Accordingly, it is provided that the value of the rotation angle is recorded at which there is a deviation of the value of the measured variable from the initial value. It is therefore intended not to abort the process already upon detection of the first contact, but instead to record the entire angle of rotation at which the deviation already described for the first contact occurs Initial value results. If, for example, there is a small angle of rotation, for example of one or a few degrees, then it can often be assumed that the optimum setting value has not yet been reached. If, however, a larger angle of rotation arises, then one can assume that already a major part or the entire part of the printing areas has contact with the second cylinder, so that one is already close to the optimum adjustment value.
  • the invention provides that even after the first contact, which is associated with a Anstellwert, the employment is carried out further, so the relative distance between the cylinder involved in the process is further reduced. After this renewed change in the setting position, the measuring run just described is repeated. In turn, the value of the angle of rotation is recorded at which a deviation of the value of the measured variable from the initial value results. In this case, further pressure ranges can now be detected, which are "deeper" with respect to the first contact surface, the outer surface of which therefore has a smaller distance from the axis of rotation of the cylinder than the surface initially determined. The value of the rotation angle at which a deviation of the value of the measured variable from the initial value results is in such a case a higher value.
  • the change in the setting position is preferably carried out in steps with a width of less than 50 micrometers, in particular less than 25 micrometers.
  • a function of the value of the angle of rotation which results in a deviation of the value of the measured variable from the initial value, depending on the setting position, is thus obtained.
  • the value should initially be at 0, increase with further reduction of the distance of the cylinder and later go into a saturation region.
  • the number of different setting positions, which are controlled by the control unit, can be limited when the saturation range is reached. The number can also be before Implementation of the method by the machine operator or machine side be given or be.
  • the optimal positioning position can now be found from the described function as follows: Where the function has the greatest slope (ie a maximum in the derivative), the optimum positioning position can first be determined. However, in order to detect the deeper areas, the slopes of the function are now also checked for other positioning positions. The next highest slope, especially the second largest slope, is now set as the optimal pitch. In a further embodiment, however, this position is only considered to be the optimum setting position if the value of this gradient has a minimum proportion of the value of the greatest gradient. For example, the second largest slope is only evaluated if its value is at least 10% of the value of the largest slope.
  • FIG. 1 shows a typical flexographic printing machine 100 equipped with a two-cylinder reciprocating device.
  • the printing machine shown is a so-called central cylinder flexographic printing machine and includes the essential components described below.
  • an unwinding device 101 is provided for unwinding a material web 110 from a winding 111.
  • This material web 110 is supplied to the printing unit 102, in which it is acted upon by at least one color.
  • the printed material web 110 is passed through a drying device in which the printed ink is dried.
  • the winding of the material web 110 takes place on a winding 112 in the winding device 104.
  • the printing unit 102 comprises a central impression cylinder 120, on which the material web 110 is laid on by means of a pressure roller 121.
  • the material web 110 always lying on the outer surface of the impression cylinder 120, passed over several inking units, one of which is exemplified by the reference numeral 122. With every inking unit, a printing ink can be applied to the material web.
  • An inking unit 122 in this case comprises a format cylinder 123 and an inking roller 124, which is generally designed as an anilox roller.
  • FIG. 2 shows now in an enlarged view a section of the printing unit 122.
  • the displacement device 210 for the format cylinder 123 which comprises a carriage 211 which carries the format cylinder 123.
  • the carriage is linearly displaceable on a rail 212.
  • the displacement is effected by the motor M S , which drives a spindle 213, which is screwed into a thread of the carriage.
  • M S which drives a spindle 213
  • the drive which here through a motor is realized, is controlled by the control device S or even regulated.
  • the drive of the format cylinder is effected by the motor M FZ , which is also controlled by the control device.
  • the format cylinder rotates in the direction of the arrow R FZ .
  • the format cylinder has a radius r.
  • the drive of the impression cylinder is effected by the motor M GDZ , which is also controlled by the control device.
  • the impression cylinder rotates in the direction of the arrow R GDZ .
  • the format cylinder is covered with a first pressure plate 221 and a second pressure plate 222 whose outer surfaces lie on the radii r 1 and r 2 .
  • the relation r ⁇ r 2 ⁇ r 1 applies.
  • the pressure plate 221 occupies the angle ⁇ 1
  • the pressure plate 222 the angle ⁇ 2 .
  • the format cylinder is now gradually approximated to the impression cylinder along the axis x.
  • format cylinder and impression cylinder are driven at different speeds, the format cylinder is advantageously driven at the higher speed.
  • To drive the format cylinder is preferably an asynchronous motor, which is operated in the field weakening operation, used, as shown in the DE 2009 025 053 A1 is described.
  • the format cylinder 123 essentially rotates one full revolution until it is further approximated to the impression cylinder 120. First, the printing plates 221 have no contact with the printing material, not shown, which rests on the impression cylinder 120.
  • this path is shown in area I.
  • the format cylinder 123 undergoes no speed change or a braking force.
  • the pressure plate 221 in contact with the impression cylinder 120 and the substrate.
  • the format cylinder 123 now experiences a deceleration or a braking force which extends over the angle ⁇ 1 , which in the FIG. 3 marked as area II.
  • a slowdown is thereby detected that approaches the rotational speed of the format cylinder 123 to the rotational speed of the impression cylinder 120.
  • rotational speed is meant here the peripheral speed.
  • the pressure plate 222 still has no contact with the impression cylinder 120.
  • r is the distance of the axis of rotation of the format cylinder to the peripheral surface of the impression cylinder.
  • Another possibility for a termination criterion may be the second largest change in the FIG. 3 be recorded function. In this example, this is the transition from area II to area III.
  • LIST OF REFERENCE NUMBERS 100 flexographic printing 101 unwinding 102 printing unit 104 takeup 120 Impression cylinder 121 pressure roller 122 inking 123 Formatzyl inder 124 Inking roller 210 shifter 211 carriage 212 rail 213 spindle 221 printing plate 222 printing plate M FZ engine M GDZ engine M s engine S control device rr 1 r 2 radius R FZ Direction format cylinder R GDZ Direction impression cylinder ⁇ 1 angle ⁇ 2 angle

Description

Die Erfindung betrifft ein Verfahren und Vorrichtung zum gegenseitigen Anstellen von zwei Zylindern in einer Druckmaschine.The invention relates to a method and apparatus for mutual adjustment of two cylinders in a printing press.

Zur Abwicklung von Druckaufträgen, die den heutigen Qualitätsanforderungen entsprechen, ist es notwendig, die am Druckprozess beteiligten Zylinder aneinander anzustellen, damit die richtige Menge Druckfarbe von einem auf den nächsten Zylinder oder auf den durch ihn transportierten Bedruckstoff übertragen wird. Mit den Begriffen "Anstellen" beziehungsweise "Anstellung" ist hier der relative Abstand der jeweils zwei beteiligten Zylinder gemeint. Dabei ist zu beachten, dass die Drehachsen dieser Zylinder nicht zwangsläufig parallel liegen müssen. Es kann Abweichungen hiervon geben, beispielsweise wenn einer dieser Zylinder eine konische Form aufweist.To process print jobs that meet today's quality requirements, it is necessary to align the cylinders involved in the printing process so that the correct amount of ink is transferred from one to the next cylinder or to the substrate transported through it. By the terms "hiring" or "employment" here the relative distance of the two cylinders involved is meant. It should be noted that the axes of rotation of these cylinders do not necessarily have to be parallel. There may be deviations, for example if one of these cylinders has a conical shape.

Insbesondere die bei einem Flexodruckverfahren und in einer Flexodruckmaschine am Druckprozess beteiligten Zylinder müssen sehr genau aneinander angestellt werden, um den eingangs erwähnten optimalen Farbübertrag zu gewährleisten. Das liegt daran, dass beim Flexodruck die druckenden Bereiche gegenüber den nicht druckenden Bereichen eines Druckbildes erhaben sind. Zudem bestehen die so genannten Druckplatten oder Klischees, die vom Druckzylinder getragen werden, aus flexiblem Material. Ist der relative Abstand zweier Zylinder zu groß, wird keine oder nicht ausreichend Druckfarbe auf oder von der Druckplatte übertragen. Ist der Abstand dem gegenüber zu gering, werden Teile der Druckplatte gequetscht, was sich beispielsweise in so genannten Quetschrändern im ausgedruckten Druckbild bemerkbar macht.In particular, the cylinders involved in a flexographic printing process and in a flexographic printing machine on the printing process must be made very close to each other in order to ensure the optimal color transfer mentioned above. This is due to the fact that in flexographic printing the printing areas are raised compared to the non-printing areas of a printed image. In addition, the so-called printing plates or plates, which are carried by the printing cylinder, made of flexible material. If the relative distance between two cylinders is too great, no or insufficient ink is transferred to or from the printing plate. Is the Distance to the opposite too small, parts of the printing plate are squeezed, which is noticeable for example in so-called crushing edges in the printed image.

In heutiger Zeit wechseln die Druckaufträge an einer Druckmaschine relativ häufig, was in der Regel mit dem Wechsel zumindest der Druckplatten oder der Zylinderkomponenten, auf denen sie montiert sind, einhergeht. Oft ändert sich dabei auch die Drucklänge, d. h. der Umfang der Zylinder. Vor dem Start eines neuen Jobs muss also jeweils die optimale Anstellposition mit einem Anstellverfahren ermittelt werden. Ein großer Wunsch ist dabei, möglichst wenig Makulatur zu erzeugen.At the present time, the print jobs on a printing press change relatively frequently, which is usually accompanied by the change of at least the printing plates or the cylinder components on which they are mounted. This often also changes the print length, d. H. the circumference of the cylinders. Before the start of a new job, the optimum setting position must be determined using a positioning method. A great desire is to produce as little waste as possible.

In der Druckschrift DE 2009 025 053 A1 wird bereits eine Vorrichtung und ein Verfahren zum gegenseitigen Anstellen zumindest zweier Zylinder einer Druckmaschine beschrieben.In the publication DE 2009 025 053 A1 An apparatus and a method for mutually employing at least two cylinders of a printing machine are already described.

Hier werden die beiden Zylinder, die vorzugsweise an jedem ihrer Enden eine Anstelleinrichtung aufweisen, die zumindest Lagerböcke und Stellantriebe umfassen, schrittweise aneinander angenähert. Die jeweilige Anstellposition, deren Optimalwert ja zu ermitteln ist, wird dabei jeweils bestimmt und auch gespeichert. Dabei drehen sich die beiden Zylinder durch den Einfluss von Antrieben. Die Umfangsgeschwindigkeiten der beiden Zylinder sind jedoch unterschiedlich. Die eine Messgröße zumindest eines der beiden Zylinder wird dabei permanent gemessen und deren Werte gemessen und gespeichert. Die Drehgeschwindigkeit des Zylinders ist eine geeignete Messgröße. Eine weitere geeignete Messgröße ist die Bremskraft. Dabei hat die Messgröße zunächst einen im Wesentlichen gleich bleibenden Grundwert, der als Initialwert bezeichnet werden kann. Sollte es nun innerhalb einer vollständigen Umdrehung einen Kontakt zwischen diesen Zylindern geben, so gleichen sich die Umfangsgeschwindigkeiten an, so dass nun der aktuelle Messwert vom Initialwert abweicht. Im Falle der Messung der Bremskraft erhöht sich dieser Messwert, wenn es einen Kontakt zwischen beiden Zylindern gibt. Sobald eine solche Abweichung ermittelt wurde, wird der Prozess gestoppt, da nun eine erste Anstellposition gefunden wurde.Here, the two cylinders, which preferably have at each of its ends an adjusting device which comprise at least bearing blocks and actuators, gradually approached each other. The respective setting position, whose optimum value is to be determined yes, is determined in each case and also stored. The two cylinders rotate by the influence of drives. However, the peripheral speeds of the two cylinders are different. The one measured variable of at least one of the two cylinders is permanently measured and their values are measured and stored. The rotational speed of the cylinder is a suitable measure. Another suitable measure is the braking force. The measured variable initially has a substantially constant basic value, which can be referred to as the initial value. Should there now be contact between these cylinders within a complete revolution, then the circumferential velocities are equal, so that now the current measured value deviates from the initial value. In the case of measuring the braking force, this measured value increases when there is contact between both cylinders. As soon as such a deviation has been determined, the process is stopped because a first setting position has now been found.

Die EP 1 018 426 A1 offenbart ein ganz ähnliches Verfahren.The EP 1 018 426 A1 discloses a very similar method.

Die EP 2 085 223 A1 zeigt ein weiteres Verfahren zur Anstellung zweiter Zylinder, wobei die Zylinder, in ständigem Kontakt gehalten werden und bei einer Messfahrt, die eine komplette Druckzylinderumdrehung andauert, die Anstellposition gemessen und aufgezeichnet wird. Die größte Anstellposition, also der größte gemessene Abstand zwischen Druck- und Gegendruckzylinder wird nun als optimale Druckposition angesehen.The EP 2 085 223 A1 shows a further method for employment of second cylinder, wherein the cylinders are kept in constant contact and during a test drive, which lasts a complete printing cylinder revolution, the setting position is measured and recorded. The largest setting position, ie the largest measured distance between the impression cylinder and impression cylinder, is now considered to be the optimum printing position.

Da in allen Fällen diese Anstellposition in der Regel noch nicht die optimale Anstellposition ist, muss diese noch aufgesucht werden. Eine weitere Optimierung ist an dieser Stelle notwendig. Ein Verfahren, wie es etwa in der Patentschrift EP 1 249 346 B2 offenbart ist, kann hilfreich sein. Bei diesem Verfahren werden die Anstellpositionen anhand von Vergleichen der Ausdrucke bei verschiedenen Anstellpositionen optimiert.Since in all cases this Anstellposition is usually not yet the optimal Anstellposition, this still needs to be visited. Further optimization is necessary at this point. A method as it is in the patent EP 1 249 346 B2 can be helpful. In this method, the setting positions are optimized by comparing the printouts at different setting positions.

Als nachteilig erweist sich allerdings, dass hier bereits Druckfarbe genutzt werden muss. Außerdem kann bei einer Mehrfarbendruckmaschine in der Regel nur ein Druckwerk hinsichtlich der Anstellposition optimiert werden. Insgesamt sind also ein vergleichsweise hoher Anfall von Makulatur sowie die Zeitdauer zu beklagen.However, it proves disadvantageous that printing ink must already be used here. In addition, in a multi-color printing machine usually only one printing unit can be optimized in terms of pitch. Overall, therefore, a comparatively high amount of waste paper and the length of time to complain.

Die Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren und eine Vorrichtung vorzuschlagen, mit denen sich das Auffinden der optimalen Anstellposition von zwei Zylindern beschleunigen lässt.The object of the present invention is therefore to propose a method and a device with which the finding of the optimum setting position of two cylinders can be accelerated.

Erfindungsgemäß wird diese Aufgabe, ausgehend von den oberbegrifflichen Merkmalen, durch die Merkmale des Kennzeichens des Anspruchs 1 gelöst. Demnach ist vorgesehen, dass der Wert des Drehwinkels aufgezeichnet wird, bei dem sich eine Abweichung des Wertes der Messgröße vom Initialwert ergibt. Es ist also vorgesehen, nicht bereits bei dem Erkennen des ersten Kontakts den Vorgang abzubrechen, sondern den gesamten Drehwinkel aufzuzeichnen, bei dem sich die bereits beschriebene Abweichung zu dem Initialwert ergibt. Sollte sich zum Beispiel ein kleiner Drehwinkel ergeben, beispielsweise von einem oder wenigen Grad, so ist oft davon auszugehen, dass noch nicht der optimale Anstellwert erreicht ist. Ergibt sich jedoch ein größerer Drehwinkel, so kann man annehmen, dass bereits ein Großteil oder der ganze Teil der druckenden Bereiche Kontakt mit dem zweiten Zylinder hat, so dass man bereits dem optimalen Anstellwert nahe ist.According to the invention, this object is achieved on the basis of the above-mentioned features by the features of the characterizing part of claim 1. Accordingly, it is provided that the value of the rotation angle is recorded at which there is a deviation of the value of the measured variable from the initial value. It is therefore intended not to abort the process already upon detection of the first contact, but instead to record the entire angle of rotation at which the deviation already described for the first contact occurs Initial value results. If, for example, there is a small angle of rotation, for example of one or a few degrees, then it can often be assumed that the optimum setting value has not yet been reached. If, however, a larger angle of rotation arises, then one can assume that already a major part or the entire part of the printing areas has contact with the second cylinder, so that one is already close to the optimum adjustment value.

Weiterhin ist erfindungsgemäß vorgesehen, das auch nach dem ersten Kontakt, dem ein Anstellwert zugeordnet ist, die Anstellung weiter durchgeführt wird, also der relative Abstand der am Verfahren beteiligten Zylinder weiter verkleinert wird. Nach dieser neuerlichen Veränderung der Anstellposition wird die soeben beschriebene Messfahrt wiederholt. Es wird wiederum der Wert des Drehwinkels aufgezeichnet, bei dem sich eine Abweichung des Wertes der Messgröße vom Initialwert ergibt. Dabei können nun weitere Druckbereiche erfasst werden, die gegenüber der ersten Kontaktfläche "tiefer" liegen, deren Außenoberfläche also einen geringeren Abstand zu der Drehachse des Zylinders hat als die zunächst ermittelte Fläche. Der Wert des Drehwinkels, bei dem sich eine Abweichung des Wertes der Messgröße vom Initialwert ergibt, ist in einem solchen Fall also ein höherer Wert.Furthermore, the invention provides that even after the first contact, which is associated with a Anstellwert, the employment is carried out further, so the relative distance between the cylinder involved in the process is further reduced. After this renewed change in the setting position, the measuring run just described is repeated. In turn, the value of the angle of rotation is recorded at which a deviation of the value of the measured variable from the initial value results. In this case, further pressure ranges can now be detected, which are "deeper" with respect to the first contact surface, the outer surface of which therefore has a smaller distance from the axis of rotation of the cylinder than the surface initially determined. The value of the rotation angle at which a deviation of the value of the measured variable from the initial value results is in such a case a higher value.

Vorteilhaft ist dabei, wenn für jede Anstellposition der Zylinder eine im Wesentlichen vollständige Umdrehung gedreht wird, bevor die nächste Anstellposition angesteuert wird. Bevorzugt wird dabei, dass der Zylinder während der Veränderung der Anstellposition weitergedreht wird. Der Winkel, um den der Zylinder während der Änderung der Anstellposition weitergedreht wird, ist sehr klein und kann vernachlässigt werden. Das kann in Kauf genommen werden, um nicht die Rotationsbewegung des Zylinders während der Veränderung der Anstellposition stoppen zu müssen.It is advantageous if, for each pitching position of the cylinder, a substantially complete revolution is rotated before the next pitching position is activated. It is preferred that the cylinder is rotated further during the change of the setting position. The angle by which the cylinder is further rotated during the change of the setting position, is very small and can be neglected. This can be accepted in order not to have to stop the rotational movement of the cylinder during the change of the setting position.

Die Veränderung der Anstellposition erfolgt bevorzugt in Schritten mit einer Weite von weniger als 50 Mikrometer, insbesondere weniger als 25 Mikrometern.The change in the setting position is preferably carried out in steps with a width of less than 50 micrometers, in particular less than 25 micrometers.

Nach einer Anzahl von verschiedenen Anstellpositionen hat man auf diese Weise eine Funktion des Wertes des Drehwinkels, bei dem sich eine Abweichung des Wertes der Messgröße vom Initialwert ergibt, in Abhängigkeit von der Anstellposition. Der Wert dürfte zunächst bei 0 sein, mit weiterer Verkleinerung des Abstandes der Zylinder ansteigen und später in einen Sättigungsbereich übergehen. Die Anzahl der verschiedenen Anstellpositionen, die von der Steuer- und Regeleinheit angesteuert werden, kann bei Erreichen des Sättigungsbereiches begrenzt werden. Die Anzahl kann aber auch vor Durchführung des Verfahrens durch den Maschinenbediener oder maschinenseitig vorgegeben werden oder sein.After a number of different setting positions, a function of the value of the angle of rotation, which results in a deviation of the value of the measured variable from the initial value, depending on the setting position, is thus obtained. The value should initially be at 0, increase with further reduction of the distance of the cylinder and later go into a saturation region. The number of different setting positions, which are controlled by the control unit, can be limited when the saturation range is reached. The number can also be before Implementation of the method by the machine operator or machine side be given or be.

Die optimale Anstellposition kann aus der beschriebenen Funktion nun wie folgt aufgefunden werden: Dort, wo die Funktion die größte Steigung hat (also ein Maximum in der Ableitung), kann zunächst die optimale Anstellposition festgelegt werden. Um jedoch die tiefer liegenden Bereiche mit zu erfassen, werden nun auch für andere Anstellpositionen die Steigungen der Funktion überprüft. Die jeweils nächstgrößte Steigung, insbesondere die zweitgrößte Steigung, wird nun als optimale Anstellposition festgelegt. In weiterer Ausgestaltung wird diese Position jedoch nur dann als optimale Anstellposition gewertet, wenn der Wert dieser Steigung einen Mindestanteil an dem Wert der größten Steigung aufweist. So wird beispielsweise die zweitgrößte Steigung nur dann ausgewertet, wenn ihr Wert mindestens 10 % des Wertes der größten Steigung aufweist.The optimal positioning position can now be found from the described function as follows: Where the function has the greatest slope (ie a maximum in the derivative), the optimum positioning position can first be determined. However, in order to detect the deeper areas, the slopes of the function are now also checked for other positioning positions. The next highest slope, especially the second largest slope, is now set as the optimal pitch. In a further embodiment, however, this position is only considered to be the optimum setting position if the value of this gradient has a minimum proportion of the value of the greatest gradient. For example, the second largest slope is only evaluated if its value is at least 10% of the value of the largest slope.

Weitere Details und Ausführungsbeispiele der Erfindung ergeben sich aus den Unteransprüchen und den Figuren.Further details and embodiments of the invention will become apparent from the dependent claims and the figures.

Die folgenden Figuren zeigen:

Fig. 1
Seitenansicht einer Flexodruckmaschine
Fig. 2
Vergrößerte Darstellung eines Farbwerks
Fig. 3
Darstellung der Abhängigkeit des Messwerts von der Anstellposition
The following figures show:
Fig. 1
Side view of a flexographic printing machine
Fig. 2
Enlarged illustration of an inking unit
Fig. 3
Representation of the dependency of the measured value on the setting position

Fig. 1 zeigt eine typische Flexodruckmaschine 100, die mit einer Vorrichtung zum gegenseitigen Anstellen von zwei Zylindern ausgestattet ist. Die gezeigte Druckmaschine ist eine so genannte Zentralzylinder-Flexodruckmaschine und umfasst die im folgenden beschriebenen, wesentlichen Komponenten. Zunächst ist eine Abwickeleinrichtung 101 zum Abwickeln einer Materialbahn 110 von einem Wickel 111 vorgesehen. Diese Materialbahn 110 wird dem Druckwerk 102 zugeführt, in dem sie mit zumindest einer Farbe beaufschlagt wird. Die bedruckte Materialbahn 110 wird durch eine Trocknungseinrichtung geführt, in der die aufgedruckte Druckfarbe getrocknet wird. Abschließend erfolgt das Aufwickeln der Materialbahn 110 auf einen Wickel 112 in der Aufwickeleinrichtung 104. Fig. 1 Figure 1 shows a typical flexographic printing machine 100 equipped with a two-cylinder reciprocating device. The printing machine shown is a so-called central cylinder flexographic printing machine and includes the essential components described below. First, an unwinding device 101 is provided for unwinding a material web 110 from a winding 111. This material web 110 is supplied to the printing unit 102, in which it is acted upon by at least one color. The printed material web 110 is passed through a drying device in which the printed ink is dried. Finally, the winding of the material web 110 takes place on a winding 112 in the winding device 104.

Das Druckwerk 102 umfasst einen zentralen Gegendruckzylinder 120, auf welchen die Materialbahn 110 mittels einer Anpresswalze 121 aufgelegt wird. Auf diese Weise wird die Materialbahn 110, immer auf der Außenoberfläche des Gegendruckzylinders 120 aufliegend, an mehreren Farbwerken vorbei geführt, von denen eines exemplarisch mit dem Bezugszeichen 122 gekennzeichnet ist. Mit jedem Farbwerk kann eine Druckfarbe auf die Materialbahn aufgetragen werden.The printing unit 102 comprises a central impression cylinder 120, on which the material web 110 is laid on by means of a pressure roller 121. In this way, the material web 110, always lying on the outer surface of the impression cylinder 120, passed over several inking units, one of which is exemplified by the reference numeral 122. With every inking unit, a printing ink can be applied to the material web.

Ein Farbwerk 122 umfasst dabei einen Formatzylinder 123 und eine Farbauftragswalze 124, die in der Regel als Rasterwalze ausgebildet ist.An inking unit 122 in this case comprises a format cylinder 123 and an inking roller 124, which is generally designed as an anilox roller.

Um die Druckfarbe, die der Formatzylinder 123 von der Farbauftragswalze erhält, in gewünschter Qualität auf die Materialbahn übertragen zu können, ist es notwendig, den Formatzylinder in einem optimalen Abstand relativ zum Gegendruckzylinder zu positionieren.In order to be able to transfer the printing ink which the format cylinder 123 receives from the inking roller to the material web in the desired quality, it is necessary to position the format cylinder at an optimum distance relative to the impression cylinder.

Die Figur 2 zeigt nun in vergrößerter Darstellung einen Ausschnitt des Druckwerks 122. Gezeigt ist darüber hinaus die Verschiebeeinrichtung 210 für den Formatzylinder 123, der einen Schlitten 211 umfasst, welche den Formatzylinder 123 trägt. Der Schlitten ist auf einer Schiene 212 linear verschiebbar. Die Verschiebung erfolgt durch den Motor MS, der eine Spindel 213 antreibt, welche in ein Gewinde des Schlittens eingeschraubt ist. Anders aufgebaute und arbeitende Verschiebeeinrichtungen sind hier natürlich ebenfalls denkbar. Wichtig ist hingegen, dass der Antrieb, welcher hier durch einen Motor realisiert ist, von der Steuereinrichtung S angesteuert oder gar geregelt wird.The FIG. 2 shows now in an enlarged view a section of the printing unit 122. Shown moreover is the displacement device 210 for the format cylinder 123, which comprises a carriage 211 which carries the format cylinder 123. The carriage is linearly displaceable on a rail 212. The displacement is effected by the motor M S , which drives a spindle 213, which is screwed into a thread of the carriage. Of course, differently constructed and operating displacement devices are also conceivable here. It is important, however, that the drive, which here through a motor is realized, is controlled by the control device S or even regulated.

Der Antrieb des Formatzylinders erfolgt durch den Motor MFZ, der ebenfalls von der Steuereinrichtung geregelt wird. Dabei dreht der Formatzylinder in Richtung des Pfeils RFZ. Der Formatzylinder hat einen Radius r.The drive of the format cylinder is effected by the motor M FZ , which is also controlled by the control device. The format cylinder rotates in the direction of the arrow R FZ . The format cylinder has a radius r.

Der Antrieb des Gegendruckzylinders erfolgt durch den Motor MGDZ, der ebenfalls von der Steuereinrichtung geregelt wird. Dabei dreht der Gegendruckzylinder in Richtung des Pfeils RGDZ.The drive of the impression cylinder is effected by the motor M GDZ , which is also controlled by the control device. The impression cylinder rotates in the direction of the arrow R GDZ .

Um nun das erfindungsgemäße Verfahren zu verdeutlichen, ist in dem dargestellten Ausführungsbeispiel der Formatzylinder mit einer ersten Druckplatte 221 und einer zweiten Druckplatte 222 belegt, deren Außenoberflächen auf den Radien r1 und r2 liegen. Es gilt die Beziehung r < r2 < r1. Die Druckplatte 221 belegt den Winkel α1, die Druckplatte 222 den Winkel α2.In order to illustrate the method according to the invention, in the illustrated embodiment, the format cylinder is covered with a first pressure plate 221 and a second pressure plate 222 whose outer surfaces lie on the radii r 1 and r 2 . The relation r <r 2 <r 1 applies. The pressure plate 221 occupies the angle α 1 , the pressure plate 222 the angle α 2 .

Zur Durchführung des erfindungsgemäßen Verfahrens wird der Formatzylinder nun schrittweise dem Gegendruckzylinder entlang der Achse x angenähert. Dabei werden Formatzylinder und Gegendruckzylinder mit unterschiedlichen Geschwindigkeiten angetrieben, wobei der Formatzylinder vorteilhafterweise mit der höheren Geschwindigkeit angetrieben wird. Zum Antrieb des Formatzylinders wird vorzugsweise ein Asynchronmotor, der im Feldschwächbetrieb betrieben wird, verwendet, wie es in der DE 2009 025 053 A1 beschrieben ist.To carry out the method according to the invention, the format cylinder is now gradually approximated to the impression cylinder along the axis x. In this case, format cylinder and impression cylinder are driven at different speeds, the format cylinder is advantageously driven at the higher speed. To drive the format cylinder is preferably an asynchronous motor, which is operated in the field weakening operation, used, as shown in the DE 2009 025 053 A1 is described.

Der Formatzylinder 123 dreht im Wesentlichen eine vollständige Umdrehung, bis er weiter an den Gegendruckzylinder 120 angenähert wird. Zunächst haben die Druckplatten 221 keinen Kontakt zum nicht dargestellten Bedruckstoff, der auf dem Gegendruckzylinder 120 aufliegt.The format cylinder 123 essentially rotates one full revolution until it is further approximated to the impression cylinder 120. First, the printing plates 221 have no contact with the printing material, not shown, which rests on the impression cylinder 120.

In der Figur 3 ist dieser Weg im Bereich I dargestellt. Dabei erfährt der Formatzylinder 123 keine Geschwindigkeitsänderung oder eine Bremskraft. Bei weiterer Annäherung kommt nun die Druckplatte 221 in Kontakt mit dem Gegendruckzylinder 120 bzw. dem Bedruckstoff. Der Formatzylinder 123 erfährt nun eine Verlangsamung bzw. eine Bremskraft, die sich über den Winkel α1 erstreckt, was in der Figur 3 als Bereich II markiert ist. Eine Verlangsamung wird dabei dadurch festgestellt, dass sich die Drehgeschwindigkeit des Formatzylinders 123 an die Drehgeschwindigkeit des Gegendruckzylinders 120 annähert. Mit Drehgeschwindigkeit ist hier die Umfangsgeschwindigkeit gemeint. Die Druckplatte 222 hat dabei noch keinen Kontakt mit dem Gegendruckzylinder 120.In the FIG. 3 this path is shown in area I. In this case, the format cylinder 123 undergoes no speed change or a braking force. at Further approach now comes the pressure plate 221 in contact with the impression cylinder 120 and the substrate. The format cylinder 123 now experiences a deceleration or a braking force which extends over the angle α 1 , which in the FIG. 3 marked as area II. A slowdown is thereby detected that approaches the rotational speed of the format cylinder 123 to the rotational speed of the impression cylinder 120. By rotational speed is meant here the peripheral speed. The pressure plate 222 still has no contact with the impression cylinder 120.

Erst bei weiterer Annäherung tritt auch die Druckplatte 222 mit dem Gegendruckzylinder 120 in Kontakt, so dass nun eine weitere Verlangsamung des Formatzylinders über den Winkelbereich α2 festgestellt wird. Es ergibt sich also eine Gesamtverlangsamung über einen Winkelbereich α, der der Summe der einzelnen Winkelbereich α1 und α2 entspricht. Dies ist in der Figur 3 als Bereich III dargestellt. Der Gesamtwinkelbereich α, in dem eine Verlangsamung festgestellt wird, stellt die Ordinate des Diagramms in der Figur 3 dar. Die Abszisse ist die aktuelle Position des Formatzylinders relativ zum Gegendruckzylinder.Only on further approach does the pressure plate 222 also come into contact with the impression cylinder 120, so that now a further deceleration of the format cylinder over the angular range α 2 is detected. This results in an overall deceleration over an angular range α, which corresponds to the sum of the individual angular ranges α 1 and α 2 . This is in the FIG. 3 shown as area III. The total angle range α, in which a deceleration is detected, represents the ordinate of the graph in FIG FIG. 3 The abscissa is the current position of the format cylinder relative to the impression cylinder.

Bei weiterer Annäherung wird im Idealfall keine weitere Verlangsamung festgestellt, zumindest wenn der Abstand der beiden Zylinder größer r bleibt. Dabei ist r der Abstand der Drehachse des Formatzylinders zur Umfangsoberfläche des Gegendruckzylinders. Dies bedeutet, dass der Vorgang beendet wird und nun eine Position aufgefunden wurde, bei der im Wesentlichen alle Bereiche aller Druckplatten den Gegendruckzylinder 120 bzw. den Bedruckstoff berühren, so dass das vorgesehene Druckbild möglichst vollständig übertragen wird.On further approach, no further deceleration is ideally detected, at least if the distance of the two cylinders remains greater than r. Here, r is the distance of the axis of rotation of the format cylinder to the peripheral surface of the impression cylinder. This means that the process is ended and now a position has been found in which substantially all areas of all printing plates touch the counter-pressure cylinder 120 or the printing material, so that the intended printed image is transmitted as completely as possible.

In der Praxis kann es jedoch schwierig sein, die optimale Anstellung aufzufinden. Ein Grund kann beispielsweise darin liegen, dass die Drehachsen beider Zylinder nicht parallel zueinander sind. Daher kann bei weiterer Annäherung eine weitere Druckplatte einen Einfluss ausüben, die in axialer Richtung von einer ersten Druckplatte beabstandet ist, wie es in der Regel beim mehrnutzigen Drucken (mehrere unabhängige Druckmotive werden nebeneinander auf einer Materialbahn gedruckt) der Fall ist. Etwa in einem solchen Fall kann es sich anbieten, den Vorgang nach einer kurzen Anzahl von unterschiedlichen Messungen zu beenden.However, in practice it can be difficult to find the optimal job. One reason may be, for example, that the axes of rotation of both cylinders are not parallel to each other. Therefore, on further approach, another pressure plate exert an influence, which is spaced in the axial direction of a first pressure plate, as is usually the case multi-use printing (several independent print motifs are printed side by side on a web) is the case. In such a case, it may be convenient to end the process after a short number of different measurements.

Eine weitere Möglichkeit für ein Abbruchkriterium kann die zweitgrößte Änderung in der in Figur 3 aufgezeichneten Funktion sein. In diesem Beispiel ist dies der Übergang vom Bereich II zum Bereich III.Another possibility for a termination criterion may be the second largest change in the FIG. 3 be recorded function. In this example, this is the transition from area II to area III.

Selbstverständlich ist es auch möglich, den Vorgang so lange durchzuführen, bis die Änderungen unter einem Schwellwert bleiben, beispielsweise wenn eine keine Änderung oder eine Änderung von maximal 5 % zum vorherigen Wert zu beobachten ist. Bezugszeichenliste 100 Flexodruckmaschine 101 Abwickeleinrichtung 102 Druckwerk 104 Aufwickeleinrichtung 120 Gegendruckzylinder 121 Anpresswalze 122 Farbwerk 123 Formatzyl inder 124 Farbauftragswalze 210 Verschiebeeinrichtung 211 Schlitten 212 Schiene 213 Spindel 221 Druckplatte 222 Druckplatte MFZ Motor MGDZ Motor MS Motor S Steuereinrichtung r r1 r2 Radius RFZ Richtung Formatzylinder RGDZ Richtung Gegendruckzylinder α1 Winkel α2 Winkel Of course, it is also possible to carry out the process until the changes remain below a threshold value, for example if a change or a change of no more than 5% to the previous value is observed. LIST OF REFERENCE NUMBERS 100 flexographic printing 101 unwinding 102 printing unit 104 takeup 120 Impression cylinder 121 pressure roller 122 inking 123 Formatzyl inder 124 Inking roller 210 shifter 211 carriage 212 rail 213 spindle 221 printing plate 222 printing plate M FZ engine M GDZ engine M s engine S control device rr 1 r 2 radius R FZ Direction format cylinder R GDZ Direction impression cylinder α 1 angle α 2 angle

Claims (11)

  1. A method for the mutual positioning of two cylinders (120, 123) in a printing machine (100), wherein:
    • The cylinders (120, 123) are driven at different circumferential velocities by way of in each case at least one drive,
    • at least the first cylinder (120) is moved in the direction of the second cylinder (123) by means of at least one positioning device, wherein the placement position is determined,
    • the values at least of one measured variable of at least one of the two cylinders (120, 123) are detected by a measuring or detection device,
    • the values of the measured variable are received and the positioning device is controlled by a control device,
    • the placement position is determined, wherein the first change of the value of the measured variable of the at least one cylinder (120, 123) has resulted with respect to an initial value of said measured variable,
    characterized in
    that the angular range (α, α1 α2) of the angle of rotation is recorded, in which a deviation of the value of the measured variable from the initial value results and
    that after the determination of the placement position, which has shown the first change of the value of the measured variable of the at least one cylinder (120, 123) in respect to the initial value, at least one more time the first cylinder is moved in the direction of the second cylinder, wherein in turn the angular range of the angle of rotation is recorded, in which a deviation of the value of the measured variable from the initial value results.
  2. A method according to the preceding claim,
    characterized in that
    the measured variable is the angular velocity of the cylinder.
  3. A method according to any one of the preceding claims,
    characterized in that
    the first cylinder is moved in the direction of the second cylinder, after the first cylinder has carried out at least one complete rotation.
  4. A method according to any one of the preceding claims,
    characterized in
    that several times the first cylinder is moved in the direction of the second cylinder,
    that for each placement position the value of the angle of rotation is determined, in which a deviation of the value of the measured variable from the initial value results, and that the respective relative share of the value of the angle of rotation in the total angle of rotation of a rotation of the first cylinder is recorded as a function of the placement position.
  5. A method according to any one of the preceding claims,
    characterized in that
    a first positioning value is determined, in which the largest change of the relative share of the angle of rotation is the total angle of rotation of a rotation of the first cylinder, in which a deviation of the value of the measured variable from the initial value results.
  6. A method according to one of the two preceding claims,
    characterized in that
    at least one further positioning value is determined, in which the next largest change of the relative share of the angle of rotation is the total angle of rotation of a rotation of the first cylinder, in which a deviation of the value of the measured variable from the initial value results.
  7. A method according to one of the three preceding claims,
    characterized in that
    initially the first positioning value is set as the optimal positioning value.
  8. A method according to the preceding claim,
    characterized in that
    the at least one further positioning value is set as the optimal positioning value, in which the second largest change of the relative share of the angle of rotation is the total angle of rotation of a rotation of the first cylinder, in which a deviation of the value of the measured variable from the initial value results, if the value of this second largest gradient exceeds the set share of the largest gradient.
  9. A method according to one of the two preceding claims,
    characterized in that
    the first cylinder is positioned according to the optimal positioning value of the second cylinder.
  10. A method according to any one of the preceding claims,
    characterized in that
    by means of in each case one positioning device for each end of the first cylinder said cylinder is moved, wherein the positioning value of the first positioning device lags behind or leads that of the second positioning device.
  11. A device for the mutual positioning of two cylinders in a printing machine (100), in which the cylinders (120, 123) are placed in rotation, wherein:
    • The cylinders (120, 123) can be driven with in each case at least one drive with different rotational velocity,
    • the first cylinder is movable by means of at least one positioning device in the direction of the second cylinder, wherein the placement position can be determined by means of a distance determination means,
    • the values at least of one measured variable at least of one of the two cylinders (120, 123) can be detected by a measuring or detection device,
    • A control device is provided, with which the positioning device is controllable, and with which the respective value of the measured variable can be received by the measuring or detection device and can be assigned to the placement position, wherein with the control device the placement position can be maintained, in which the value of the measured variable is changed in comparison to the value of the measured variable in a previous placement position,
    characterized in
    that with the control device the angular range (α, α1 α2) of the angle of rotation can be recorded, in which a deviation of the value of the measured variable from the initial value can be observed and
    that with the control device the positioning device can be controlled at least one more time for the movement of the first cylinder in the direction of the second cylinder, wherein with the control device the angular range (α, α1 α2) of the angle of rotation can in turn be recorded, in which a deviation of the value of the measured variable from the initial value results.
EP14736785.8A 2013-07-05 2014-07-07 Method and device for mutual throwing on of two cylinders in a printing press Active EP3016805B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013213264 2013-07-05
PCT/EP2014/064452 WO2015001126A1 (en) 2013-07-05 2014-07-07 Method and device for mutual throwing on of two cylinders in a printing press

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DE102016015722B4 (en) 2016-05-11 2023-06-22 Koenig & Bauer Ag Method for detecting and setting parameters of a processing unit
DE102016208109A1 (en) * 2016-05-11 2017-11-16 Koenig & Bauer Ag Method for detecting and setting parameters of a processing unit
IT201900003965A1 (en) * 2019-03-19 2020-09-19 Koenig & Bauer Flexotecnica S P A METHOD FOR DETERMINING THE POSITION OF MUTUAL CONTACT BETWEEN A PRINT ROLL AND AT LEAST ONE COUNTER-ROLL SELECTED BETWEEN A CENTRAL DRUM AND AN INK ROLL IN FLEXOGRAPHIC PRINTING MACHINES AND THE RELEVANT FLEXOGRAPH PRINTING MACHINE
EP3941747B1 (en) 2019-03-19 2023-04-05 Koenig & Bauer AG Method for determining a position of reciprocal contact between a printing roller and at least one counter-roller of a flexographic printing machine

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Publication number Priority date Publication date Assignee Title
DE19900258A1 (en) * 1999-01-07 2000-07-13 Fischer & Krecke Gmbh & Co Method for positioning two cylinders of a printing press against one another
ES2300209B1 (en) * 2006-11-22 2009-05-01 Comexi, S.A. METHOD OF POSITIONAL ADJUSTMENT OF PRINTER BODIES IN FLEXOGRAPHIC PRINTER MACHINES.
DE102009025053A1 (en) * 2009-06-10 2010-12-16 Windmöller & Hölscher Kg Device and method for mutual hiring at least two cylinders of a printing press

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