EP0986469B1 - Method for operating an engraving member - Google Patents

Method for operating an engraving member Download PDF

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Publication number
EP0986469B1
EP0986469B1 EP98934806A EP98934806A EP0986469B1 EP 0986469 B1 EP0986469 B1 EP 0986469B1 EP 98934806 A EP98934806 A EP 98934806A EP 98934806 A EP98934806 A EP 98934806A EP 0986469 B1 EP0986469 B1 EP 0986469B1
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EP
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Prior art keywords
engraving
signal
during
frequency
head
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EP98934806A
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German (de)
French (fr)
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EP0986469A1 (en
Inventor
Siegfried Beisswenger
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/045—Mechanical engraving heads

Definitions

  • the invention relates to the field of electronic reproduction technology and relates to a method for operating an engraving member in an electronic Engraving machine for engraving printing forms, especially printing cylinders, for gravure printing.
  • an electromagnetic engraver moves in an electronic engraving machine Engraving organ with an engraving stylus as a cutting tool in axial direction along a rotating pressure cylinder.
  • the one from an engraving signal controlled engraving stylus cuts a sequence of arranged in a grid Wells, called wells, in the outer surface of the printing cylinder.
  • the engraving signal is made by overlaying one of the tonal values between "Black" and "white” representing image signal with a periodic raster signal educated.
  • a vibrating lifting movement of the Engraving stylus to generate the grid controls the image signal accordingly the tonal values to be reproduced the depths of the in the surface of the Printing cylinder engraved cell.
  • the drive system exists for the Engraving stylus essentially from an engraved signal stationary electromagnet, in the air gap of which the armature of a rotating system emotional.
  • the rotating system has an anchor axis Axle bearings and a damping device.
  • One end of the anchor axis is as one resilient torsion bar clamped in place, while the other End carries a lever-like stylus holder for the engraving stylus.
  • the engraving signal creates an alternating magnetic field in the electromagnet generated, which exerts alternating electrical torques on the armature, which counteracts the mechanical torque of the torsion bar.
  • the changing electrical torques cause a vibration movement the anchor axis by angle from the rest position defined by the torsion bar, which are proportional to the amplitudes of the engraving signal.
  • the stylus holder guides the anchor axis with the engraving stylus on the Shell surface of the pressure cylinder aligned lifting movements, which the penetration depths of the engraving stylus in the outer surface of the impression cylinder.
  • the alternating magnetic field in the electromagnet generates alternating current losses in the armature that depend on the frequency of the raster signal.
  • the AC losses heat the anchor, the anchor axis and the stylus holder the engraving stylus slowly from an initial temperature at the start of engraving up to a stable operating temperature during engraving.
  • the warming causes one Extension of the anchor axis and the stylus holder as well as a change in magnetic permeability of the pole shoe of the electromagnet and Anchor.
  • the object of the present invention is therefore to provide a method for operating a Engraving device in an electronic engraving machine for engraving printing forms, especially of printing cylinders for gravure, to improve in such a way that annoying changes in temperature are avoided in order to ensure a good Engraving quality is achieved.
  • a printing cylinder (1) is driven in rotation by a rotary drive (2).
  • An engraving element (4) mounted on an engraving carriage (3) with an engraving stylus as a cutting tool moves with the help of a feed drive (5) driven spindle (6) in the axial direction on the rotating pressure cylinder (1) along.
  • the engraving element (4) is an electromagnetic engraving element in the exemplary embodiment with an electromagnetic drive system for the engraving stylus.
  • An electromagnetic drive system was already in the introduction to the description explained in detail and is known for example from DE 23 36 089 A.
  • the drive system for the engraving stylus can also be used as a solid-state actuator element from an electostrictive, piezocrystalline or a magnetostrictive Material be formed.
  • Engraving organ (4) cuts a series of engraving lines arranged in a grid Cups in the outer surface of the rotating pressure cylinder (1), while the engraving member (4) gradually axially along the printing cylinder (1) emotional.
  • the engraving signal (G) is superimposed on a periodic raster signal (R), also called vibration, with analog image values (B), which between the tonal values of the wells to be engraved Represent "black” and “white", formed in an overlay (9).
  • Raster generator (10) provides the periodic raster signal (R), its frequency is switchable by a control signal (S).
  • the control signal (S) is in a Sequence control (11) generated and the raster generator (10) via a line (12) fed.
  • the engraving data are engraving lines for in an engraving data memory (13) Engraving line in the order required to engrave the impression cylinder (1) filed.
  • Each well to be engraved has an engraving date of at least assigned to a byte, which among other things as engraving information contains serious tonal value between "black” and "white”.
  • the engraving data (GD) are, for example, by dot and line, optoelectronic Scanning of an original to be reproduced obtained in a scanner and then stored in the engraving data memory (13).
  • the engraving data (GD) are read out of the engraving data memory (13) by means of a reading cycle sequence T S and converted into the analog image values (B) in an A / D converter (14) Engraving amplifiers (8) are fed via a line (15).
  • the reading cycle sequence T S is also generated in the sequence control (11) and reaches the engraving data memory (13) via a line (16).
  • the sequence control (11) is synchronized with the rotary movement of the printing cylinder (1) in that a pulse generator (17) mechanically coupled to the rotary drive (2) supplies a synchronous signal to the sequence control (11) via a line (18).
  • the invention proposed the engraving element (4) before the start of engraving and / or to heat during engraving breaks so that the stable operating temperature is approximately reached at the start of engraving and / or during the interruptions in engraving do not decrease significantly.
  • the heating of the engraving element (4) can take place in that it is before the start of engraving and / or during the engraving interruptions with the existing periodic Raster signal is applied. Since the engraving frequency in practice in The audible range lies and the rotary system of the engraving element (4) with the engraving frequency vibrates, but noise can occur.
  • the noise pollution can be significantly reduced if the engraving element (4) for heating before engraving begins and / or during engraving breaks a periodic signal is applied, the frequency of which is greater than the engraving frequency and is chosen such that the rotary system only still vibrates with a small amplitude, i.e. because of its mass of frequency of the periodic signal no longer follows. Nevertheless, by elastic Deformation of parts of the drive system still disturbing noises occur.
  • the periodic signal with ultrasound frequency ensures that required heating of the armature and the armature axis of the engraving member (4) to the operating temperature due to the eddy current losses occurring in the armature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Description

Die Erfindung bezieht sich auf das Gebiet der elektronischen Reproduktionstechnik und betrifft ein Verfahren zum Betrieb eines Gravierorgans in einer elektronischen Graviermaschine zur Gravur von Druckformen, insbesondere von Druckzylindern, für den Tiefdruck.The invention relates to the field of electronic reproduction technology and relates to a method for operating an engraving member in an electronic Engraving machine for engraving printing forms, especially printing cylinders, for gravure printing.

In einer elektronischen Graviermaschine bewegt sich beispielsweise ein elektromagnetisches Gravierorgan mit einem Gravierstichel als Schneidwerkzeug in axialer Richtung an einem rotierenden Druckzylinder entlang. Der von einem Graviersignal gesteuerte Gravierstichel schneidet eine Folge von in einem Raster angeordneten Vertiefungen, Näpfchen genannt, in die Mantelfläche des Druckzylinders. Das Graviersignal wird aus der Überlagerung eines die Tonwerte zwischen "Schwarz" und "Weiß" repräsentierenden Bildsignals mit einem periodischen Rastersignal gebildet. Während das Rastersignal eine vibrierende Hubbewegung des Gravierstichels zur Erzeugung des Rasters bewirkt, steuert das Bildsignal entsprechend den wiederzugebenden Tonwerten die Tiefen der in die Mantelfläche des Druckzylinders gravierten Näpfchen.For example, an electromagnetic engraver moves in an electronic engraving machine Engraving organ with an engraving stylus as a cutting tool in axial direction along a rotating pressure cylinder. The one from an engraving signal controlled engraving stylus cuts a sequence of arranged in a grid Wells, called wells, in the outer surface of the printing cylinder. The engraving signal is made by overlaying one of the tonal values between "Black" and "white" representing image signal with a periodic raster signal educated. During the raster signal a vibrating lifting movement of the Engraving stylus to generate the grid controls the image signal accordingly the tonal values to be reproduced the depths of the in the surface of the Printing cylinder engraved cell.

Bei einem elektromagnetischen Gravierorgan besteht das Antriebssystem für den Gravierstichel im wesentlichen aus einem mit dem Graviersignal beaufschlagten stationären Elektromagneten, in dessen Luftspalt sich der Anker eines Drehsystems bewegt. Das Drehsystem weist, außer dem Anker, eine Ankerachse, ein Achsenlager und eine Dämpfungsvorrichtung auf. Ein Ende der Ankerachse ist als ein raumfest eingespannter, federnder Torsionsstab ausgebildet, während das andere Ende einen hebelartigen Stichelhalter für den Gravierstichel trägt.In the case of an electromagnetic engraving element, the drive system exists for the Engraving stylus essentially from an engraved signal stationary electromagnet, in the air gap of which the armature of a rotating system emotional. In addition to the anchor, the rotating system has an anchor axis Axle bearings and a damping device. One end of the anchor axis is as one resilient torsion bar clamped in place, while the other End carries a lever-like stylus holder for the engraving stylus.

Durch das Graviersignal wird in dem Elektromagneten ein magnetisches Wechselfeld erzeugt, das auf den Anker wechselnde elektrische Drehmomente ausübt, denen das mechanische Drehmoment des Torsionsstabes entgegenwirkt. Die wechselnden elektrischen Drehmomente verursachen eine Vibrationsbewegung der Ankerachse aus der durch den Torsionsstab definierten Ruhelage um Winkel, die den Amplituden des Graviersignals proportional sind. Durch die Vibrationsbewegung der Ankerachse führt der Stichelhalter mit dem Gravierstichel auf die Mantelfläche des Druckzylinders gerichtete Hubbewegungen aus, welche die Eindringtiefen des Gravierstichels in die Mantelfläche des Druckzylinders bestimmen. The engraving signal creates an alternating magnetic field in the electromagnet generated, which exerts alternating electrical torques on the armature, which counteracts the mechanical torque of the torsion bar. The changing electrical torques cause a vibration movement the anchor axis by angle from the rest position defined by the torsion bar, which are proportional to the amplitudes of the engraving signal. Through the vibration movement the stylus holder guides the anchor axis with the engraving stylus on the Shell surface of the pressure cylinder aligned lifting movements, which the penetration depths of the engraving stylus in the outer surface of the impression cylinder.

Das magnetische Wechselfeld im Elektromagneten erzeugt im Anker Wechselstromverluste die von der Frequenz des Rastersignals abhängig sind. Die Wechselstromverluste erwärmen den Anker, die Ankerachse und den Stichelhalter mit dem Gravierstichel langsam von einer Ausgangstemperatur bei Gravurstart bis zu einer stabilen Betriebstemperatur bei der Gravur. Die Erwärmung verursacht eine Ausdehnung der Ankerachse und des Stichelhalters sowie eine Veränderung der magnetischen Permeabilität des Polschuheisens des Elektromagneten und des Ankers.The alternating magnetic field in the electromagnet generates alternating current losses in the armature that depend on the frequency of the raster signal. The AC losses heat the anchor, the anchor axis and the stylus holder the engraving stylus slowly from an initial temperature at the start of engraving up to a stable operating temperature during engraving. The warming causes one Extension of the anchor axis and the stylus holder as well as a change in magnetic permeability of the pole shoe of the electromagnet and Anchor.

Bei herkömmlichen Frequenzen des Rastersignals (Gravierfrequenzen) sind die Temperaturänderungen zwischen der Ausgangstemperatur bei Gravierstart und der stabilen Betriebstemperatur sowie bei Gravierunterbrechungen so gering, daß die durch die Erwärmung verursachten Ausdehnungs- und Permeabilitätsänderungen die Qualität der gravierten Näpfchen nicht nachteilig beeinflussen.At conventional frequencies of the raster signal (engraving frequencies) Temperature changes between the initial temperature at engraving start and the stable operating temperature and during engraving interruptions so low that the expansion and permeability changes caused by the warming do not adversely affect the quality of the engraved cells.

In der Praxis besteht die Forderung nach kürzeren Gravierzeiten bzw. nach höheren Graviergeschwindigkeiten. Um die Forderungen zu erreichen, müssen die Umfangsgeschwindigkeit des Druckzylinders, die axiale Vorschubgeschwindigkeit des Gravierorgans und die Gravierfrequenz erhöht werden.In practice there is a demand for shorter engraving times or longer ones Engraving speeds. To meet the demands, the Circumferential speed of the printing cylinder, the axial feed speed of the engraving member and the engraving frequency can be increased.

Da zum Betrieb eines Gravierorgans mit einer höheren Gravierfrequenz eine überproportional höhere elektrische Leistung benötigt wird, entstehen aufgrund einer höheren Betriebstemperatur größere Temperaturänderungen, die zu unzulässigen Ausdehnungs- und Permeabilitätsänderungen und damit zur Gravur fehlerhafter Näpfchen führen können.Because a disproportionate for operating an engraving device with a higher engraving frequency higher electrical power is required due to a higher operating temperature greater temperature changes that are too impermissible Expansion and permeability changes and thus incorrect for engraving Can lead wells.

Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren zum Betrieb eines Gravierorgans in einer elektronischen Graviermaschine zur Gravur von Druckformen, insbesondere von Druckzylindern, für den Tiefdruck, derart zu verbessern, daß störende Temperaturänderungen vermieden werden, um dadurch eine gute Gravierqualität erreicht wird.The object of the present invention is therefore to provide a method for operating a Engraving device in an electronic engraving machine for engraving printing forms, especially of printing cylinders for gravure, to improve in such a way that annoying changes in temperature are avoided in order to ensure a good Engraving quality is achieved.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.

Vorteilhafte Weiterbildungen und Ausgestaltungen sind in den Unteransprüchen angegeben. Advantageous further developments and refinements are in the subclaims specified.

Die Erfindung wird nachfolgend anhand einer Figur näher erläutert, die ein prinzipielles Blockschaltbild einer Graviermaschine zur Gravur von Druckzylindern zeigt.The invention is explained in more detail below with reference to a figure which is a principle Block diagram of an engraving machine for engraving printing cylinders shows.

Ein Druckzylinder (1) wird von einem Rotationsantrieb (2) rotatorisch angetrieben. Ein auf einem Gravierwagen (3) montiertes Gravierorgan (4) mit einem Gravierstichel als Schneidwerkzeug bewegt sich mit Hilfe einer durch einen Vorschubantrieb (5) angetriebenen Spindel (6) in Achsrichtung an dem rotierenden Druckzylinder (1) entlang.A printing cylinder (1) is driven in rotation by a rotary drive (2). An engraving element (4) mounted on an engraving carriage (3) with an engraving stylus as a cutting tool moves with the help of a feed drive (5) driven spindle (6) in the axial direction on the rotating pressure cylinder (1) along.

Das Gravierorgan (4) ist im Ausführungsbeispiel ein elektromagnetisches Gravierorgan mit einem elektromagnetischen Antriebssystem für den Gravierstichel. Ein elektromagnetisches Antriebssystem wurde in der Beschreibungseinleitung bereits ausführlich erläutert und ist beispielsweise aus der DE 23 36 089 A bekannt. Das Antriebssystem für den Gravierstichel kann aber auch als Festkörper-Aktorelement aus einem elektostriktiven, piezokristallinen oder einem magnetostriktiven Material ausgebildet sein.The engraving element (4) is an electromagnetic engraving element in the exemplary embodiment with an electromagnetic drive system for the engraving stylus. An electromagnetic drive system was already in the introduction to the description explained in detail and is known for example from DE 23 36 089 A. The drive system for the engraving stylus can also be used as a solid-state actuator element from an electostrictive, piezocrystalline or a magnetostrictive Material be formed.

Der durch ein Graviersignal (G) auf einer Leitung (7) gesteuerte Gravierstichel des Gravierorgans (4) schneidet gravierlinienweise eine Folge von in einem Raster angeordneten Näpfchen in die Mantelfläche des rotierenden Druckzylinders (1), während sich das Gravierorgan (4) schrittweise axial an dem Druckzylinder (1) entlang bewegt.The engraving stylus of the controlled by an engraving signal (G) on a line (7) Engraving organ (4) cuts a series of engraving lines arranged in a grid Cups in the outer surface of the rotating pressure cylinder (1), while the engraving member (4) gradually axially along the printing cylinder (1) emotional.

In einem Gravierverstärker (8) wird das Graviersignal (G) durch Überlagerung eines periodischen Rastersignals (R), auch Vibration genannt, mit analogen Bildwerten (B), welche die Tonwerte der zu gravierenden Näpfchen zwischen "Schwarz" und "Weiß" repräsentieren, in einer Überlagerungsstufe (9) gebildet. Ein Rastergenerator (10) stellt das periodische Rastersignal (R) bereit, dessen Frequenz durch ein Steuersignal (S) umschaltbar ist. Das Steuersignal (S) wird in einer Ablaufsteuerung (11) erzeugt und dem Rastergenerator (10) über eine Leitung (12) zugeführt.In an engraving amplifier (8), the engraving signal (G) is superimposed on a periodic raster signal (R), also called vibration, with analog image values (B), which between the tonal values of the wells to be engraved Represent "black" and "white", formed in an overlay (9). On Raster generator (10) provides the periodic raster signal (R), its frequency is switchable by a control signal (S). The control signal (S) is in a Sequence control (11) generated and the raster generator (10) via a line (12) fed.

Während das periodische Rastersignal eine vibrierende Hubbewegung des Gravierstichels zur Erzeugung des Rasters bewirkt, bestimmen die analogen Bildwerte (B) entsprechend den zu gravierenden Tonwerten die Eindringtiefen des Gravierstichels in die Mantelfläche des Druckzylinders (1). During the periodic raster signal a vibrating stroke of the engraving stylus to generate the grid determine the analog image values (B) the penetration depths of the engraving tool in accordance with the tonal values to be engraved into the outer surface of the printing cylinder (1).

In einem Gravurdaten-Speicher (13) sind die Gravurdaten (GD) Gravierlinie für Gravierlinie in der für die Gravur des Druckzylinders (1) erforderlichen Reihenfolge abgelegt. Jedem zu gravierenden Näpfchen ist ein Gravurdatum von mindestens einem Byte zugeordnet, welches unter anderem als Gravierinformation den zu gravierenden Tonwert zwischen "Schwarz" und "Weiß" enthält.The engraving data (GD) are engraving lines for in an engraving data memory (13) Engraving line in the order required to engrave the impression cylinder (1) filed. Each well to be engraved has an engraving date of at least assigned to a byte, which among other things as engraving information contains serious tonal value between "black" and "white".

Die Gravurdaten (GD) werden beispielsweise durch punkt- und zeilenweise, optoelektronische Abtastung einer zu reproduzierenden Vorlage in einem Scanner gewonnen und dann in dem Gravurdaten-Speicher (13) abgelegt.The engraving data (GD) are, for example, by dot and line, optoelectronic Scanning of an original to be reproduced obtained in a scanner and then stored in the engraving data memory (13).

Bei der Gravur des Druckzylinders (1) werden die Gravurdaten (GD) mittels einer Lesetaktfolge TS aus dem Gravurdaten-Speicher (13) ausgelesen und in einem A/D-Wandler (14) in die analogen Bildwerte (B) umgewandelt, die dem Gravierverstärker (8) über eine Leitung (15) zugeführt werden.When engraving the printing cylinder (1), the engraving data (GD) are read out of the engraving data memory (13) by means of a reading cycle sequence T S and converted into the analog image values (B) in an A / D converter (14) Engraving amplifiers (8) are fed via a line (15).

Die Lesetaktfolge TS, deren Frequenz der einfachen oder mehrfachen Frequenz des Rastersignals entspricht, wird ebenfalls in der Ablaufsteuerung (11) erzeugt und gelangt über eine Leitung (16) an den Gravurdaten-Speicher (13). Die Ablaufsteuerung (11) ist mit der Drehbewegung des Druckzylinders (1) synchronisiert, indem ein mit dem Rotationsantrieb (2) mechanisch gekoppelter Impulsgeber (17) ein Synchronsignal über eine Leitung (18) an die Ablaufsteuerung (11) liefert.The reading cycle sequence T S , the frequency of which corresponds to the single or multiple frequency of the raster signal, is also generated in the sequence control (11) and reaches the engraving data memory (13) via a line (16). The sequence control (11) is synchronized with the rotary movement of the printing cylinder (1) in that a pulse generator (17) mechanically coupled to the rotary drive (2) supplies a synchronous signal to the sequence control (11) via a line (18).

Zur Beseitigung der in der Beschreibungseinleitung genannten Probleme wird erfindungsgemäß vorgeschlagen, das Gravierorgan (4) vor Gravierbeginn und/oder während Gravierunterbrechungen derart zu erwärmen, daß die stabile Betriebstemperatur bereits bei Gravierbeginn näherungsweise erreicht wird und/oder während der Gravierunterbrechungen nicht wesentlich absinkt.To eliminate the problems mentioned in the introduction to the description, the invention proposed the engraving element (4) before the start of engraving and / or to heat during engraving breaks so that the stable operating temperature is approximately reached at the start of engraving and / or during the interruptions in engraving do not decrease significantly.

Die Erwärmung des Gravierorgans (4) kann dadurch erfolgen, daß es vor Gravierbeginn und/oder während der Gravierunterbrechungen mit dem vorhandenen periodischen Rastersignal beaufschlagt wird. Da die Gravierfrequenz in der Praxis im Hörbereich liegt und das Drehsystem des Gravierorgans (4) mit der Gravierfrequenz schwingt, kann es aber zu Geräuschbelästigungen kommen.The heating of the engraving element (4) can take place in that it is before the start of engraving and / or during the engraving interruptions with the existing periodic Raster signal is applied. Since the engraving frequency in practice in The audible range lies and the rotary system of the engraving element (4) with the engraving frequency vibrates, but noise can occur.

Die Geräuschbelästigungen lassen sich erheblich reduzieren, wenn das Gravierorgan (4) zur Erwärmung vor Gravierbeginn und/oder während der Gravierunterbrechungen mit einem periodischen Signal beaufschlagt wird, dessen Frequenz größer als die Gravierfrequenz und derart gewählt ist, daß das Drehsystem nur noch mit einer geringen Amplitude schwingt, d.h. aufgrund seiner Masse der Frequenz des periodischen Signals nicht mehr folgt. Dennoch können durch elastische Verformungen von Teilen des Antriebssystems noch störende Geräusche auftreten.The noise pollution can be significantly reduced if the engraving element (4) for heating before engraving begins and / or during engraving breaks a periodic signal is applied, the frequency of which is greater than the engraving frequency and is chosen such that the rotary system only still vibrates with a small amplitude, i.e. because of its mass of frequency of the periodic signal no longer follows. Nevertheless, by elastic Deformation of parts of the drive system still disturbing noises occur.

Daher wird in vorteilhafter Weise zur Erwärmung des Gravierorgans (4) ein periodisches Signal verwendet, dessen Frequenz im Ultraschallbereich liegt, beispielsweise 20 kHz beträgt.It is therefore advantageous to heat the engraving member (4) periodically Used signal whose frequency is in the ultrasonic range, for example Is 20 kHz.

Durch die Beaufschlagung des Gravierorgans (4) durch ein periodisches Signal mit Ultraschallfrequenz schwingt das Drehsystem mit einer so geringen Amplitude, daß die Schallemission in vorteilhafter Weise stark reduziert und nicht mehr hörbar ist. Andererseits gewährleistet das periodische Signal mit Ultraschallfrequenz die erforderliche Erwärmung des Ankers und der Ankerachse des Gravierorgans (4) auf die Betriebstemperatur durch die im Anker entstehenden Wirbelstromverluste.By applying a periodic signal to the engraving element (4) Ultrasonic frequency vibrates the rotating system with such a small amplitude, that the sound emission is advantageously greatly reduced and no longer audible is. On the other hand, the periodic signal with ultrasound frequency ensures that required heating of the armature and the armature axis of the engraving member (4) to the operating temperature due to the eddy current losses occurring in the armature.

Da die Wirbelstromverluste bei Anregung mit einer Ultraschallfrequenz wesentlich höher sind als bei einer Anregung mit der Gravierfrequenz während der Gravur, ist für die Erwärmung des Gravierorgans (4) vor Gravurbeginn und/oder in Gravurpausen eine wesentlich geringere elektrische Leistung erforderlich als diejenige, die für die Gravur benötigt wird.Since the eddy current losses when excited with an ultrasonic frequency are essential are higher than with an excitation with the engraving frequency during the engraving for heating the engraving element (4) before the start of engraving and / or during engraving breaks a much lower electrical output is required than that which is needed for the engraving.

Als periodisches Signal kann in bevorzugter Weise das in dem Rastergenerator (10) erzeugte Rastersignal verwendet werden, dessen Frequenz durch das Steuersignal (S) von der Gravierfrequenz bei der Gravur auf die höhere Frequenz, vorzugsweise auf die Ultraschallfrequenz, vor Gravurstart und/oder während der Gravierunterbrechungen umgeschaltet wird.As a periodic signal, this can preferably be done in the raster generator (10) generated raster signal are used, the frequency of which is determined by the control signal (S) from the engraving frequency when engraving to the higher frequency, preferably on the ultrasound frequency, before the start of engraving and / or during the interruption of engraving is switched.

Claims (6)

  1. Method for the operation of an engraving head in an electronic engraving machine for the engraving of formes, in particular printing cylinders, for intaglio printing, in which
    an engraving stylus of the engraving head (4) controlled by an engraving signal (G) engraves a series of cells arranged in a screen in the rotating printing cylinder (1),
    the engraving signal (G) is formed by superimposing a periodic screen signal (R) for generating the screen array on a video signal (B) representing the tonal values to be engraved and
    for area engraving of cells, the engraving head (4) executes an advance motion along the printing cylinder (1) in the axial direction of the printing cylinder (1), characterized in that before starting, and/or during a break in, engraving, the engraving head (4) is heated, in order to obtain good engraving quality.
  2. Method according to Claim 1, characterized in that before the start of, and/or during the break in, engraving, the engraving head (4) is heated to approximately the operating temperature that is attained by the engraving head (4) during engraving.
  3. Method according to Claim 1 or 2, characterized in that the engraving head (4) is heated before the start of, and/or during the break in, engraving, by being energized with the periodic screen signal (R).
  4. Method according to Claim 1 or 2, characterized in that the engraving head (4) is heated before the start of, and/or during the break in, engraving, by being energized with the periodic signal at a frequency set at least sufficiently high for the engraving head (4) to oscillate only with a low amplitude greatly reducing acoustic emission.
  5. Method according to Claim 4, characterized in that the engraving head (4) is heated before the start of, and/or during the break in, engraving, by being energized with the periodic signal at a frequency lying in the ultrasonic range, so that acoustic emissions are no longer audible.
  6. Method according to Claim 4 or 5, characterized in that
    the screen signal (R) is used as the periodic signal and
    the frequency of the screen signal (R) is changed from the engraving frequency to the higher frequency, preferably to the ultrasonic frequency, before the start of, and/or during the break in, engraving.
EP98934806A 1997-06-03 1998-05-27 Method for operating an engraving member Expired - Lifetime EP0986469B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19723184A DE19723184B4 (en) 1997-06-03 1997-06-03 Method for operating an engraving element
DE19723184 1997-06-03
PCT/DE1998/001445 WO1998055305A1 (en) 1997-06-03 1998-05-27 Method for operating an engraving member

Publications (2)

Publication Number Publication Date
EP0986469A1 EP0986469A1 (en) 2000-03-22
EP0986469B1 true EP0986469B1 (en) 2001-12-19

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EP98934806A Expired - Lifetime EP0986469B1 (en) 1997-06-03 1998-05-27 Method for operating an engraving member

Country Status (7)

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US (1) US6741369B1 (en)
EP (1) EP0986469B1 (en)
JP (1) JP3149193B2 (en)
CN (1) CN1261307A (en)
DE (2) DE19723184B4 (en)
ES (1) ES2167917T3 (en)
WO (1) WO1998055305A1 (en)

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AU2008100847A4 (en) * 2007-10-12 2008-10-09 Bluescope Steel Limited Method of forming textured casting rolls with diamond engraving
FR2986737B1 (en) * 2012-02-14 2014-02-21 Cyllab ELECTROMECHANICAL ENGRAVING PROCESS HIGH DEFINITION OF CYLINDERS FOR THE HELIOGRAVURE PRINTING PROCESS
CN103832049B (en) * 2014-01-28 2015-09-23 太仓丽盛制版有限公司 Secondary supplement engraving process in gravure plate-making
CN105479923A (en) * 2014-09-16 2016-04-13 上海运青制版有限公司 Supplementary engraving method for printing roller
CN105946337B (en) * 2016-06-24 2018-04-20 无锡欧诺锁业有限公司 A kind of surfacial pattern carving device of gravure cylinder
CN112497892B (en) * 2020-12-15 2024-02-02 固高科技股份有限公司 Servo driving device and system

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Also Published As

Publication number Publication date
JP3149193B2 (en) 2001-03-26
DE19723184B4 (en) 2006-01-12
JP2000512941A (en) 2000-10-03
US6741369B1 (en) 2004-05-25
CN1261307A (en) 2000-07-26
DE59802547D1 (en) 2002-01-31
ES2167917T3 (en) 2002-05-16
EP0986469A1 (en) 2000-03-22
WO1998055305A1 (en) 1998-12-10
DE19723184A1 (en) 1998-12-10

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