EP1362696A1 - Printing machine with doctoring device - Google Patents

Printing machine with doctoring device Download PDF

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Publication number
EP1362696A1
EP1362696A1 EP02011106A EP02011106A EP1362696A1 EP 1362696 A1 EP1362696 A1 EP 1362696A1 EP 02011106 A EP02011106 A EP 02011106A EP 02011106 A EP02011106 A EP 02011106A EP 1362696 A1 EP1362696 A1 EP 1362696A1
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EP
European Patent Office
Prior art keywords
doctor blade
oscillator
printing machine
machine according
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02011106A
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German (de)
French (fr)
Other versions
EP1362696B1 (en
Inventor
Wilfried Dr. Kolbe
Klaus Schirrich
Andreas Kückelmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fischer and Krecke GmbH and Co KG
Original Assignee
Fischer and Krecke GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fischer and Krecke GmbH and Co KG filed Critical Fischer and Krecke GmbH and Co KG
Priority to EP02011106A priority Critical patent/EP1362696B1/en
Priority to DE50208200T priority patent/DE50208200D1/en
Priority to ES02011106T priority patent/ES2272603T3/en
Priority to US10/427,101 priority patent/US6752077B2/en
Priority to JP2003136779A priority patent/JP2003334920A/en
Publication of EP1362696A1 publication Critical patent/EP1362696A1/en
Application granted granted Critical
Publication of EP1362696B1 publication Critical patent/EP1362696B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F9/00Rotary intaglio printing presses
    • B41F9/06Details
    • B41F9/08Wiping mechanisms
    • B41F9/10Doctors, scrapers, or like devices
    • B41F9/1009Doctors, scrapers, or like devices with reciprocating movement

Definitions

  • the invention relates to a printing press with a doctor device, the one Having against a cylinder engageable doctor blade.
  • squeegee devices are generally used, the Surface of a rotating cylinder, such as the impression cylinder, with To shred off the help of a doctor blade.
  • a rotating cylinder such as the impression cylinder
  • the smooth polished surface the gravure cylinder after coloring and before the actual printing process clean off so that the ink is only in the printing, recessed Areas of the printing cylinder surface remains.
  • dust particles, dried paint residues or other dirt particles build up in front of the edge of the doctor blade and then into the printing Recesses of the gravure cylinder reach, so that they affect the printed image.
  • the doctor blade a Transverse movement transverse to the direction of rotation, ie in the axial direction of the printing cylinder granted.
  • the transverse component of the relative movement between the doctor blade and impression cylinder then helps to remove the contaminants from the To remove depressions or detach from the doctor blade, so that they with the Be flushed away and not even in the wells of the Get printing cylinder.
  • the doctor blade becomes at a substantially constant speed moved in the axial direction.
  • the direction of movement must be from time to time Time, typically after a few seconds, be reversed so that the doctor blade performs only a limited stroke, for example of the order of magnitude of a few millimeters or centimeters.
  • the bigger this stroke is, the more Furthermore, the doctor blade must survive beyond the ends of the printing cylinder.
  • For the drive and the control of the transverse movement of the doctor blade is so far a relatively complicated mechanism required.
  • the object of the invention is to provide a printing press with doctor device create a high print quality with a simplified structure leaves.
  • This object is achieved by an oscillator, the doctor blade vibrated with a frequency of at least 1 Hz.
  • the oscillator is preferably by an acoustic vibrator formed, the vibrations with the desired frequency in the infrasonic range (1 to 15 Hz), in the audible range (15 Hz to 20 kHz) or particularly preferred generated in the ultrasonic range.
  • the acoustic sounder can be constructive be very simple and can, for example, by a conventional electromagnetic transducer, a piezoelectric transducer or the like be formed.
  • the oscillator can oscillate in the longitudinal direction of the doctor blade and / or in the direction perpendicular to the plane of the doctor blade. Because it Ultimately, only depends on the relative movement, it is also conceivable, the oscillator to act on the cylinder.
  • asymmetric (e.g., sawtooth-like) vibrational patterns can be Transport effect similar to a vibratory conveyor achieve, so that the Dirt particles can be removed even more efficiently.
  • the gravure printing machine shown in FIG. 1 comprises a gravure cylinder 10, an applicator roller 12 and a impression roller 14 rotatably between side parts 16, 18 of a machine frame are mounted.
  • Associated drive and control devices have not been shown here, as they are for the understanding of the invention are not essential.
  • the application roller 12 is at its upper apex with the gravure cylinder 10 in contact and dives with its lower apex in a paint tray 20th a, as can be seen more clearly in Figure 2.
  • the applicator roller 12 thus decreases Ink from the ink tray 20 and transfers it to the peripheral surface of the gravure cylinder 10, which rotates in the direction of arrow in Figure 2 and the ink on a printing material 22 transmits, between the impression roller 14 and passes through the gravure cylinder and through the impression roller against the Gravure cylinder is pressed.
  • the gravure cylinder 10 is associated with a doctor device 24.
  • This squeegee device is formed in a known manner by a doctor blade 26, the a holder 28 is attached.
  • the holder 28 is mounted on a shaft 30 which extends between two levers 32, 34.
  • the lower ends of the levers 34 sit on a rotatable shaft 36, with which the entire doctor device 24th so can swing against the circumference of the gravure cylinder 10 that the Surface is doctored off with the cutting edge of the doctor blade 26.
  • the ink picked up by the applicator roller 12 becomes smooth, removed non-printing surface areas of the gravure cylinder 10, so that the ink remains only in the recessed areas, the generate the printed image on the substrate web 22.
  • the oscillator 38 forms a transverse thrust device, which is a movement of the cutting edge the doctor blade 26 relative to the gravure cylinder 10 in the direction transverse to Running direction of the printing material web 22, ie in the axial direction of the gravure cylinder generated. If the cutting edge of the doctor blade 26 on dirt particles These are solved by the oscillation of the doctor blade and with the Ink removed. In this way, prevents the printed image through permanently in the depressions of the gravure cylinder remaining dirt particles is impaired.
  • the oscillation frequency of the oscillator 38 is for example in the ultrasonic range, so that the transverse vibrations of the doctor blade 26, the mold running Have ultrasonic waves that extend to the opposite end of the doctor blade spread out and there by one between the lever 32 and the holder 28 inserted damper 40 are absorbed.
  • the lever 34, on which the oscillator 38 is directly supported is in the example shown designed particularly rigid, so that the ultrasonic vibrations effective be coupled into the holder 28 and the doctor blade 26.
  • FIG. 3 shows, as a modified exemplary embodiment, a gravure cylinder 10 with a chambered doctor blade 42.
  • the doctor blade 26 is inside the chambered doctor blade arranged and is oscillated by the oscillator 38 predominantly in the direction offset perpendicular to the plane of the doctor blade, as by a Double arrow is given in Figure 3.
  • the oscillator 38 can be so outside the Chamber doctor be arranged that the vibrations on the doctor blade be transmitted.
  • the invention is not only in gravure printing machines but also in others Printing machines applicable.
  • the chamber doctor blade 42 arranged on the circumference of an anilox roller the inner doctor blade 26 would be omitted, and instead the doctor blade 26 'in Vibrations offset, the chamber doctor blade in the direction of rotation of the anilox roller closes at the back end.

Abstract

An ultrasonic oscillator (38) with an acoustic vibratory transmitter sets a doctor blade (26) oscillating at a frequency of 1 Hertz or more in the direction of the doctor blade's longitudinal axis. The travel of the oscillator is less than 0.2 mm. The doctor blade forms part of a doctor blade chamber. An Independent claim is also included for a roller printing machine.

Description

Die Erfindung betrifft eine Druckmaschine mit einer Rakelvorrichtung, die ein gegen einen Zylinder anstellbares Rakelmesser aufweist.The invention relates to a printing press with a doctor device, the one Having against a cylinder engageable doctor blade.

In Druckmaschinen werden Rakelvorrichtungen generell dazu eingesetzt, die Oberfläche eines rotierenden Zylinders, beispielsweise des Druckzylinders, mit Hilfe eines Rakelmessers abzurakeln. Beispielsweise hat eine solche Rakelvorrichtung in einer Tiefdruckmaschine die Funktion, die glatt polierte Oberfläche des Tiefdruckzylinders nach dem Einfärben und vor dem eigentlichen Druckvorgang sauber abzurakeln, so daß die Druckfarbe nur in den druckenden, vertieften Bereichen der Druckzylinderoberfläche verbleibt. Es kann jedoch vorkommen, daß sich Staubpartikel, angetrocknete Farbreste oder sonstige Schmutzpartikel vor der Kante des Rakelmessers aufbauen und dann in die druckenden Vertiefungen des Tiefdruckzylinders gelangen, so daß sie das Druckbild beeinträchtigen. Zur Lösung dieses Problems ist es bekannt, dem Rakelmesser eine Querbewegung quer zur Rotationsrichtung, also in Axialrichtung des Druckzylinders zu erteilen. Die Querkomponente der Relativbewegung zwischen Rakelmesser und Druckzylinder trägt dann dazu bei, die Verunreinigungen aus den Vertiefungen zu entfernen oder vom Rakelmesser zu lösen, so daß sie mit der Druckfarbe weggespült werden und gar nicht erst in die Vertiefungen des Druckzylinders gelangen.In printing presses squeegee devices are generally used, the Surface of a rotating cylinder, such as the impression cylinder, with To shred off the help of a doctor blade. For example, such a squeegee device in a gravure press the function, the smooth polished surface the gravure cylinder after coloring and before the actual printing process clean off so that the ink is only in the printing, recessed Areas of the printing cylinder surface remains. However, it can happen that dust particles, dried paint residues or other dirt particles build up in front of the edge of the doctor blade and then into the printing Recesses of the gravure cylinder reach, so that they affect the printed image. To solve this problem, it is known, the doctor blade a Transverse movement transverse to the direction of rotation, ie in the axial direction of the printing cylinder granted. The transverse component of the relative movement between the doctor blade and impression cylinder then helps to remove the contaminants from the To remove depressions or detach from the doctor blade, so that they with the Be flushed away and not even in the wells of the Get printing cylinder.

Üblicherweise wird das Rakelmesser mit im wesentlichen konstanter Geschwindigkeit in Axialrichtung bewegt. Die Bewegungsrichtung muß jedoch von Zeit zu Zeit, typischerweise nach einigen Sekunden, umgekehrt werden, damit das Rakelmesser nur einen begrenzten Hub ausführt, beispielsweise in der Größenordnung von einigen Millimetern oder Zentimetern. Je größer dieser Hub ist, desto weiter muß das Rakelmesser über die Enden des Druckzylinders überstehen. Für den Antrieb und die Steuerung der Querbewegung des Rakelmessers ist bisher ein relativ aufwendiger Mechanismus erforderlich. Außerdem führen der Überstand des Rakelmessers und dessen Querbewegung dazu, daß Druckfarbe von den Enden des Rakelmessers abtropft und mit aufwendigen Auffangeinrichtungen aufgefangen werden muß.Usually, the doctor blade becomes at a substantially constant speed moved in the axial direction. However, the direction of movement must be from time to time Time, typically after a few seconds, be reversed so that the doctor blade performs only a limited stroke, for example of the order of magnitude of a few millimeters or centimeters. The bigger this stroke is, the more Furthermore, the doctor blade must survive beyond the ends of the printing cylinder. For the drive and the control of the transverse movement of the doctor blade is so far a relatively complicated mechanism required. In addition, lead the Overhang of the doctor blade and its transverse movement to the fact that printing ink dripped from the ends of the doctor blade and with elaborate collecting facilities must be caught.

Aufgabe der Erfindung ist es, eine Druckmaschine mit Rakelvorrichtung zu schaffen, mit der sich bei vereinfachtem Aufbau eine hohe Druckqualität erreichen läßt.The object of the invention is to provide a printing press with doctor device create a high print quality with a simplified structure leaves.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen Oszillator, der das Rakelmesser in Schwingungen mit einer Frequenz von mindestens 1 Hz versetzt.This object is achieved by an oscillator, the doctor blade vibrated with a frequency of at least 1 Hz.

Durch die vergleichsweise hohe Frequenz des Oszillators wird bei gleicher mittlerer Geschwindigkeit ein wesentlich kürzerer Hub des Rakelmessers erreicht, so daß das Rakelmesser entsprechend weniger weit über den Zylinder überzustehen braucht. Da die Bewegung des Rakelmessers eine kurzhubige erzwungene Schwingung ist, wird die Steuerung des Bewegungsablaufs wesentlich vereinfacht, und auch die Aufhängung oder Führung für das Rakelmesser kann konstruktiv erheblich vereinfacht werden. Da außerdem die Beschleunigung des Rakelmessers proportional zum Quadrat der Frequenz ist, werden mit der erfindungsgemäßen Vorrichtung aufgrund der hohen Frequenz wesentlich größere Beschleunigungen erreicht. Dementsprechend wird auch den Schmutzpartikeln vom Rakelmesser eine höhere Beschleunigung erteilt, so daß sie sich effizienter lösen lassen.Due to the comparatively high frequency of the oscillator is at the same mean Speed reaches a much shorter stroke of the doctor blade, so that the doctor blade correspondingly less far over the cylinder needs. Because the movement of the doctor blade is a short-stroke forced Oscillation is, the control of the movement is much easier, and also the suspension or guidance for the doctor blade can be constructive be greatly simplified. In addition, the speed of the doctor blade is proportional to the square of the frequency, be with the invention Device due to the high frequency much larger Accelerations achieved. Accordingly, also the dirt particles the doctor blade gives a higher acceleration, making it more efficient let solve.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous embodiments of the invention will become apparent from the dependent claims.

Der Oszillator wird vorzugsweise durch einen akustischen Schwingungsgeber gebildet, der Schwingungen mit der gewünschten Frequenz im Infraschallbereich (1 bis 15 Hz), im hörbaren Bereich (15 Hz bis 20 kHz) oder besonders bevorzugt im Ultraschallbereich erzeugt. Der akustische Schallgeber kann konstruktiv sehr einfach aufgebaut sein und kann beispielsweise durch einen üblichen elektromagnetischen Wandler, einen piezoelektrischen Wandler oder dergleichen gebildet werden.The oscillator is preferably by an acoustic vibrator formed, the vibrations with the desired frequency in the infrasonic range (1 to 15 Hz), in the audible range (15 Hz to 20 kHz) or particularly preferred generated in the ultrasonic range. The acoustic sounder can be constructive be very simple and can, for example, by a conventional electromagnetic transducer, a piezoelectric transducer or the like be formed.

Der Oszillator kann Schwingungen in Längsrichtung des Rakelmessers und/oder in der Richtung senkrecht zur Ebene des Rakelmessers erzeugen. Da es letztlich nur auf die Relativbewegung ankommt, ist es auch denkbar, den Oszillator auf den Zylinder wirken zu lassen.The oscillator can oscillate in the longitudinal direction of the doctor blade and / or in the direction perpendicular to the plane of the doctor blade. Because it Ultimately, only depends on the relative movement, it is also conceivable, the oscillator to act on the cylinder.

Durch asymmetrische (z.B. sägezahnähnliche) Schwingungsmuster läßt sich ein Transporteffekt ähnlich wie bei einem Schwingförderer erzielen, so daß die Schmutzpartikel noch effizienter entfernt werden können. Zu dem gleichen Zweck ist es auch möglich, das Rakelmesser in elliptische Schwingungen zu versetzen.By asymmetric (e.g., sawtooth-like) vibrational patterns can be Transport effect similar to a vibratory conveyor achieve, so that the Dirt particles can be removed even more efficiently. To the same Purpose, it is also possible to put the doctor blade in elliptical vibrations.

Je höher die Frequenz des Oszillators gewählt wird, desto kleiner kann im allgemeinen der Hub gewählt werden. Bei hinreichend kleinem Hub kann die nötige Beweglichkeit des Rakelmessers allein aufgrund der Eigenelastizität der mechanischen Aufhängung oder des Rakelmessers selbst erreicht werden, so daß keine aufwendigen Mechanismen zur beweglichen Abstützung und Führung des Rakelmessers mehr benötigt werden.The higher the frequency of the oscillator is chosen, the smaller in general the stroke can be selected. With a sufficiently small stroke, the necessary Mobility of the doctor blade alone due to the inherent elasticity of the mechanical Suspension or the doctor blade itself can be achieved so that no elaborate mechanisms for movable support and guidance of the Doctor blade more needed.

Wenn der Hub des Rakelmessers kleiner gewählt wird als das Auflösungsvermögen des menschlichen Auges, beispielsweise 0,2 mm oder weniger, ist auch sichergestellt, daß die Vibration des Rakelmessers keinerlei sichtbare Spuren im Druckbild hinterläßt.When the stroke of the doctor blade is set smaller than the resolution of the human eye, for example 0.2 mm or less, is also ensured that the vibration of the doctor blade no visible traces in Print image leaves.

Bei höheren Frequenzen, bei denen trotz der hohen Schallgeschwindigkeit in Festkörpern (ca. 5000 m/s) die Schallwellenlänge kleiner wird als die Länge des Rakelmessers, kann es zweckmäßig sein, die Oszillationsfrequenz zu modulieren oder mehrere unharmonische Frequenzen so zu überlagern, daß auf der Länge des Rakelmessers keine permanenten Schwingungsknoten entstehen. Wahlweise lassen sich solche Schwingungsknoten auch dadurch unterdrücken, daß die Schallwellen am dem Oszillator entgegengesetzten Ende des Rakelmessers gedämpft werden, so daß im wesentlichen keine Reflexionen entstehen und man anstelle einer stehenden Welle eine laufende Welle erhält.At higher frequencies where, despite the high speed of sound in Solid bodies (about 5000 m / s) the sound wave length becomes smaller than the length of the Doctor blade, it may be appropriate to modulate the oscillation frequency or superimpose several inharmonic frequencies so that on the length the doctor blade no permanent vibration nodes arise. Optional can such nodes also suppress the fact that the Sound waves attenuated at the oscillator opposite end of the doctor blade so that essentially no reflections arise and one receives a running wave instead of a standing wave.

Im folgenden werden Ausführungsbeispiele anhand der Zeichnung näher erläutert.In the following embodiments are explained in detail with reference to the drawing.

Es zeigen:

Fig. 1
eine schematische Ansicht einer Tiefdruckmaschine;
Fig. 2
einen schematischen Schnitt längs der Linie II-II in Figur 1; und
Fig. 3
einen Druckzylinder mit Kammerrakel.
Show it:
Fig. 1
a schematic view of a gravure printing machine;
Fig. 2
a schematic section along the line II-II in Figure 1; and
Fig. 3
a pressure cylinder with chambered doctor blade.

Die in Figur 1 gezeigte Tiefdruckmaschine umfaßt einen Tiefdruckzylinder 10, eine Auftragwalze 12 und einen Presseur 14, die drehbar zwischen Seitenteilen 16, 18 eines Maschinengestells gelagert sind. Zugehörige Antriebs- und Stelleinrichtungen sind hier nicht dargestellt worden, da sie für das Verständnis der Erfindung nicht wesentlich sind.The gravure printing machine shown in FIG. 1 comprises a gravure cylinder 10, an applicator roller 12 and a impression roller 14 rotatably between side parts 16, 18 of a machine frame are mounted. Associated drive and control devices have not been shown here, as they are for the understanding of the invention are not essential.

Die Auftragwalze 12 steht an ihrem oberen Scheitel mit dem Tiefdruckzylinder 10 in Berührung und taucht mit ihrem unteren Scheitel in eine Farbwanne 20 ein, wie deutlicher in Figur 2 zu erkennen ist. Die Auftragwalze 12 nimmt somit Druckfarbe aus der Farbwanne 20 auf und überträgt sie auf die Umfangsfläche des Tiefdruckzylinders 10, der in Pfeilrichtung in Figur 2 rotiert und die Druckfarbe auf eine Bedruckstoffbahn 22 überträgt, die zwischen dem Presseur 14 und dem Tiefdruckzylinder hindurchläuft und durch den Presseur gegen den Tiefdruckzylinder angedrückt wird.The application roller 12 is at its upper apex with the gravure cylinder 10 in contact and dives with its lower apex in a paint tray 20th a, as can be seen more clearly in Figure 2. The applicator roller 12 thus decreases Ink from the ink tray 20 and transfers it to the peripheral surface of the gravure cylinder 10, which rotates in the direction of arrow in Figure 2 and the ink on a printing material 22 transmits, between the impression roller 14 and passes through the gravure cylinder and through the impression roller against the Gravure cylinder is pressed.

Dem Tiefdruckzylinder 10 ist eine Rakelvorrichtung 24 zugeordnet. Diese Rakelvorrichtung wird in bekannter Weise durch ein Rakelmesser 26 gebildet, das an einem Halter 28 befestigt ist. Der Halter 28 ist auf einer Welle 30 montiert, die sich zwischen zwei Hebeln 32, 34 erstreckt. Die unteren Enden der Hebel 34 sitzen auf einer drehbaren Welle 36, mit der sich die gesamte Rakelvorrichtung 24 so gegen den Umfang des Tiefdruckzylinders 10 schwenken läßt, daß dessen Oberfläche mit der Schneide des Rakelmessers 26 abgerakelt wird. Auf diese Weise wird die von der Auftragwalze 12 aufgenommene Druckfarbe von den glatten, nicht druckenden Oberflächenbereichen des Tiefdruckzylinders 10 entfernt, so daß die Druckfarbe nur noch in den vertieften Bereichen zurückbleibt, die das Druckbild auf der Bedruckstoffbahn 22 erzeugen.The gravure cylinder 10 is associated with a doctor device 24. This squeegee device is formed in a known manner by a doctor blade 26, the a holder 28 is attached. The holder 28 is mounted on a shaft 30 which extends between two levers 32, 34. The lower ends of the levers 34 sit on a rotatable shaft 36, with which the entire doctor device 24th so can swing against the circumference of the gravure cylinder 10 that the Surface is doctored off with the cutting edge of the doctor blade 26. To this Way, the ink picked up by the applicator roller 12 becomes smooth, removed non-printing surface areas of the gravure cylinder 10, so that the ink remains only in the recessed areas, the generate the printed image on the substrate web 22.

Auf der Welle 30 ist zwischen dem Hebel 34 und dem Halter 28 ein Oszillator 38 eingefügt, der den Halter 28 und damit auch das Rakelmesser 26 in hochfrequente Schwingungen in der Richtung parallel zur Achse des Tiefdruckzylinders 10 versetzt, wie durch einen Doppelpfeil in Figur 1 angedeutet wird. Der Oszillator 38 bildet somit eine Querschubeinrichtung, die eine Bewegung der Schneide des Rakelmessers 26 relativ zum Tiefdruckzylinder 10 in der Richtung quer zur Laufrichtung der Bedruckstoffbahn 22, also in Axialrichtung des Tiefdruckzylinders erzeugt. Wenn die Schneide des Rakelmessers 26 auf Schmutzpartikel trifft, werden diese durch die Oszillation des Rakelmessers gelöst und mit der Druckfarbe entfernt. Auf diese Weise wird verhindert, daß das Druckbild durch dauerhaft in den Vertiefungen des Tiefdruckzylinders verbleibende Schmutzpartikel beeinträchtigt wird.On the shaft 30 is between the lever 34 and the holder 28, an oscillator 38th inserted, the holder 28 and thus also the doctor blade 26 in high-frequency Vibrations in the direction parallel to the axis of the gravure cylinder 10 offset, as indicated by a double arrow in Figure 1. The oscillator 38 thus forms a transverse thrust device, which is a movement of the cutting edge the doctor blade 26 relative to the gravure cylinder 10 in the direction transverse to Running direction of the printing material web 22, ie in the axial direction of the gravure cylinder generated. If the cutting edge of the doctor blade 26 on dirt particles These are solved by the oscillation of the doctor blade and with the Ink removed. In this way, prevents the printed image through permanently in the depressions of the gravure cylinder remaining dirt particles is impaired.

Die Schwingungsfrequenz des Oszillators 38 liegt beispielsweise im Ultraschallbereich, so daß die Querschwingungen des Rakelmessers 26 die Form laufender Ultraschallwellen haben, die sich zum entgegengesetzten Ende des Rakelmessers ausbreiten und dort durch einen zwischen dem Hebel 32 und dem Halter 28 eingefügten Dämpfer 40 absorbiert werden.The oscillation frequency of the oscillator 38 is for example in the ultrasonic range, so that the transverse vibrations of the doctor blade 26, the mold running Have ultrasonic waves that extend to the opposite end of the doctor blade spread out and there by one between the lever 32 and the holder 28 inserted damper 40 are absorbed.

Der Hebel 34, an dem sich der Oszillator 38 direkt abstützt, ist im gezeigten Beispiel besonders biegesteif ausgeführt, damit die Ultraschallschwingungen wirksam in den Halter 28 und das Rakelmesser 26 eingekoppelt werden.The lever 34, on which the oscillator 38 is directly supported, is in the example shown designed particularly rigid, so that the ultrasonic vibrations effective be coupled into the holder 28 and the doctor blade 26.

Da die Querschwingungen des Rakelmessers allein mit Hilfe des Oszillators 38 erzeugt werden, sind keine aufwendigen Antriebe und Mechanismen zur Erzeugung und Steuerung der Querbewegung des Rakelmessers erforderlich. Eine wirksame Erzeugung der Querschwingungen ist auch dann möglich, wenn der Halter 28 starr auf der Welle 30 befestigt ist.Since the transverse vibrations of the doctor blade alone by means of the oscillator 38th are generated, no complicated drives and mechanisms for generating and controlling the cross-motion of the doctor blade required. A Effective generation of transverse vibrations is possible even if the Holder 28 is rigidly mounted on the shaft 30.

Figur 3 zeigt als abgewandeltes Ausführungsbeispiel einen Tiefdruckzylinder 10 mit einer Kammerrakel 42. Das Rakelmesser 26 ist im Inneren der Kammerrakel angeordnet und wird durch des Oszillator 38 vorwiegend in Schwingungen in der Richtung senkrecht zur Ebene des Rakelmessers versetzt, wie durch einen Doppelpfeil in Figur 3 angegeben wird. Der Oszillator 38 kann so außerhalb der Kammerrakel angeordnet sein, daß die Schwingungen auf das Rakelmesser übertragen werden.FIG. 3 shows, as a modified exemplary embodiment, a gravure cylinder 10 with a chambered doctor blade 42. The doctor blade 26 is inside the chambered doctor blade arranged and is oscillated by the oscillator 38 predominantly in the direction offset perpendicular to the plane of the doctor blade, as by a Double arrow is given in Figure 3. The oscillator 38 can be so outside the Chamber doctor be arranged that the vibrations on the doctor blade be transmitted.

Die Erfindung ist nicht nur bei Tiefdruckmaschinen, sondern auch bei anderen Druckmaschinen anwendbar. Beispielsweise wäre bei einer Flexodruckmaschine die Kammerrakel 42 am Umfang einer Rasterwalze angeordnet, das innere Rakelmesser 26 würde entfallen, und statt dessen würde das Rakelmesser 26' in Schwingungen versetzt, das die Kammerrakel am in Drehrichtung der Rasterwalze hinteren Ende abschließt.The invention is not only in gravure printing machines but also in others Printing machines applicable. For example, in a flexographic printing press the chamber doctor blade 42 arranged on the circumference of an anilox roller, the inner doctor blade 26 would be omitted, and instead the doctor blade 26 'in Vibrations offset, the chamber doctor blade in the direction of rotation of the anilox roller closes at the back end.

Claims (10)

Druckmaschine mit einer Rakelvorrichtung (24), die ein gegen einen Zylinder (10) anstellbares Rakelmesser (26) aufweist, gekennzeichnet durch einen Oszillator (38), der das Rakelmesser (26) in Schwingungen mit einer Frequenz von mindestens 1 Hz versetzt.Printing machine with a squeegee device (24), which has a doctor blade (26) engageable against a cylinder (10), characterized by an oscillator (38) which oscillates the doctor blade (26) at a frequency of at least 1 Hz. Druckmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Oszillator (38) eine Schwingung des Rakelmessers in Richtung der Längsachse desselben erzeugt.Printing machine according to Claim 1, characterized in that the oscillator (38) generates a vibration of the doctor blade in the direction of the longitudinal axis thereof. Druckmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Oszillator (38) eine Schwingung des Rakelmessers in der Richtung senkrecht zur Ebene des Rakelmessers erzeugt.Printing machine according to claim 1 or 2, characterized in that the oscillator (38) generates a vibration of the doctor blade in the direction perpendicular to the plane of the doctor blade. Druckmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Oszillator (38) ein akustischer Schwingungsgeber ist.Printing machine according to one of claims 1 to 3, characterized in that the oscillator (38) is an acoustic vibration generator. Druckmaschine nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Frequenz des Oszillators (38) mehr als 5 Hz beträgt.Printing machine according to one of the preceding claims, characterized in that the frequency of the oscillator (38) is more than 5 Hz. Druckmaschine nach Anspruch 5, dadurch gekennzeichnet, daß der Oszillator (38) ein Ultraschalloszillator ist.Printing machine according to claim 5, characterized in that the oscillator (38) is an ultrasonic oscillator. Druckmaschine nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Hub des Oszillators (38) weniger als 1 mm beträgt.Printing machine according to one of the preceding claims, characterized in that the stroke of the oscillator (38) is less than 1 mm. Druckmaschine nach Anspruch 7, dadurch gekennzeichnet, daß der Hub des Oszillators (38) weniger als 0,2 mm beträgt.Printing machine according to claim 7, characterized in that the stroke of the oscillator (38) is less than 0.2 mm. Druckmaschine nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Rakelmesser (26) Teil einer Kammerrakel (42) ist.Printing machine according to one of the preceding claims, characterized in that the doctor blade (26) is part of a chamber doctor blade (42). Tiefdruckmaschine nach einem der vorstehenden Ansprüche.Rotogravure printing machine according to one of the preceding claims.
EP02011106A 2002-05-18 2002-05-18 Printing machine with doctoring device Expired - Lifetime EP1362696B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP02011106A EP1362696B1 (en) 2002-05-18 2002-05-18 Printing machine with doctoring device
DE50208200T DE50208200D1 (en) 2002-05-18 2002-05-18 Printing machine with squeegee device
ES02011106T ES2272603T3 (en) 2002-05-18 2002-05-18 PRINTING MACHINE WITH SCRATCHING DEVICE.
US10/427,101 US6752077B2 (en) 2002-05-18 2003-05-01 Printing press with a doctor blade device
JP2003136779A JP2003334920A (en) 2002-05-18 2003-05-15 Printer with doctor blade device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02011106A EP1362696B1 (en) 2002-05-18 2002-05-18 Printing machine with doctoring device

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EP1362696A1 true EP1362696A1 (en) 2003-11-19
EP1362696B1 EP1362696B1 (en) 2006-09-20

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US (1) US6752077B2 (en)
EP (1) EP1362696B1 (en)
JP (1) JP2003334920A (en)
DE (1) DE50208200D1 (en)
ES (1) ES2272603T3 (en)

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EP1717026A2 (en) 2003-11-14 2006-11-02 Fischer & Krecke GmbH & Co. Process and device for moving a doctor blade
DE102010054417A1 (en) * 2010-12-14 2012-06-14 Heidelberger Druckmaschinen Ag Device for dosing color in printing machine for e.g. flexographic printing, has oscillation device exerting force aligned in axial direction on squeegee such that squeegee oscillates toward and away from roller due to lateral contractions
CN104589780A (en) * 2015-01-12 2015-05-06 福建省晋江市佶龙机械工业有限公司 Double-sided gravure wax printing machine for producing true-wax dye-resistant printing
WO2017182144A1 (en) * 2016-04-22 2017-10-26 Bobst Italia S.P.A. A doctor blade assembly with support in a rotogravure printing unit

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CN101870197B (en) * 2009-04-23 2014-06-04 海德堡印刷机械股份公司 Washing device
US20110032306A1 (en) * 2009-08-04 2011-02-10 Xerox Corporation System for Reducing Metering Blade Wear in a Drum Maintenance Unit
US20170239937A1 (en) * 2016-02-24 2017-08-24 Paul Joseph ROMANELLI Apparatus includes housing assembly, mountable to printing machine cylinder, for supporting doctor blade and impression roller

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DE102010054417A1 (en) * 2010-12-14 2012-06-14 Heidelberger Druckmaschinen Ag Device for dosing color in printing machine for e.g. flexographic printing, has oscillation device exerting force aligned in axial direction on squeegee such that squeegee oscillates toward and away from roller due to lateral contractions
CN104589780A (en) * 2015-01-12 2015-05-06 福建省晋江市佶龙机械工业有限公司 Double-sided gravure wax printing machine for producing true-wax dye-resistant printing
WO2017182144A1 (en) * 2016-04-22 2017-10-26 Bobst Italia S.P.A. A doctor blade assembly with support in a rotogravure printing unit

Also Published As

Publication number Publication date
EP1362696B1 (en) 2006-09-20
US20030213386A1 (en) 2003-11-20
ES2272603T3 (en) 2007-05-01
US6752077B2 (en) 2004-06-22
JP2003334920A (en) 2003-11-25
DE50208200D1 (en) 2006-11-02

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