EP1230086A1 - Method for engraving printing cylinders - Google Patents

Method for engraving printing cylinders

Info

Publication number
EP1230086A1
EP1230086A1 EP00983066A EP00983066A EP1230086A1 EP 1230086 A1 EP1230086 A1 EP 1230086A1 EP 00983066 A EP00983066 A EP 00983066A EP 00983066 A EP00983066 A EP 00983066A EP 1230086 A1 EP1230086 A1 EP 1230086A1
Authority
EP
European Patent Office
Prior art keywords
engraving
control signal
stylus
printing
damage
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
EP00983066A
Other languages
German (de)
French (fr)
Other versions
EP1230086B1 (en
Inventor
Bernd LÜBCKE
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.)
Hell Gravure Systems GmbH and Co KG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1230086A1 publication Critical patent/EP1230086A1/en
Application granted granted Critical
Publication of EP1230086B1 publication Critical patent/EP1230086B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/16—Correction processes or materials

Definitions

  • the invention relates to the field of electronic reproduction technology and relates to a method for engraving printing cylinders in an electronic engraving machine, an engraving stylus monitoring device for an electronic engraving machine and an electronic engraving machine with such an engraving stylus monitoring device.
  • an electronic engraving machine for engraving printing cylinders by means of an engraving member is already known.
  • the engraving member with an engraving stylus controlled by an engraving control signal as the cutting tool moves in the axial direction along a rotating printing cylinder.
  • the engraving stylus cuts a series of cups arranged in a printing grid into the outer surface of the printing cylinder.
  • the engraving control signal is formed by superimposing a periodic raster signal with image signal values which represent the tonal values to be reproduced between "black” and "white”. While the raster signal causes an oscillating stroke movement of the engraving stylus to engrave the cells arranged in the printing raster, the image signal values determine the depths of cut of the engraved cells in accordance with the tonal values to be reproduced.
  • DE-A-23 36 089 specifies an engraving element which essentially consists of a rotating system and an electromagnetic drive for the rotating system.
  • the rotating system has a shaft, an armature, a bearing for the shaft, a restoring element and a damping device.
  • a lever-shaped stylus holder is attached to the shaft and carries the engraving stylus.
  • the electromagnetic drive for the rotary system has a stationary electromagnet to which the engraving control signal is applied, in the air gap of which the armature of the rotary system moves. The drive causes the shaft to rotate by a small angle, and the stylus holder with the engraving stylus carries out a corresponding oscillating stroke movement in the direction of the outer surface of the printing cylinder for the engraving of the cups.
  • the invention is therefore based on the object of specifying a method for engraving printing cylinders in an electronic engraving machine, an engraving stylus monitoring device for an electronic engraving machine and an electronic engraving machine with such an engraving stylus monitoring device, by means of which the loss of time during printing form production, the in the event of damage to an engraving stylus during the engraving, is advantageously reduced.
  • Fig. 1 is a block diagram of an electronic engraving machine with an engraving stylus monitoring device and Fig. 2 shows a basic embodiment for an engraving stylus monitoring device.
  • Fig. 1 shows a block diagram of an electronic engraving machine, the game player, a HelioKlischograph ® from Hell Gravure Systems GmbH, Kiel, DE examples.
  • a pressure cylinder (1) is driven by a rotary drive (2).
  • An engraving element (3) with an engraving stylus (4) as a cutting tool is mounted on an engraving carriage (5) which can be moved in the axial direction of the rotating printing cylinder (1) with the aid of a spindle (7) driven by a feed drive (6).
  • the engraving element (3) is equipped, for example, with an electromagnetic drive for the engraving stylus (4).
  • the engraving stylus (4) can also be controlled by a solid-state actuator element made of a piezoelectric or magnetostrictive material.
  • the engraving element (3) engraves a printing form (8) in that the engraving stylus (4), which is controlled by an analogue engraving control signal GS, cuts a series of engraving lines in the printing line (1) into the outer surface of the printing cylinder (1) while the engraving carriage (5) with the engraving element (3) for extensive engraving, step by step or continuously in the axial direction along the rotating printing cylinder (1).
  • the engraving control signal GS on a line (9) is generated in an engraving amplifier (10) by superimposing a periodic raster signal R on a line (11) with an image signal B on a line (12), which the tone values of the wells to be engraved between "light "and depth” represents.
  • the image signal values B determine the cutting depths of the wells in accordance with the tonal values to be reproduced D / A converter (13) obtained from engraving data GD of the printing form (8) to be engraved are stored in an engraving data memory (14), from which they are read out in engraving lines and fed to the D / A converter (13) via a data bus (15).
  • Printing cylinders (1) are defined by the spatial coordinates (x, y) of a coordinate system assigned to the lateral surface of the printing cylinder (1), the X axis of which is aligned in the axial direction and the Y axis is aligned in the circumferential direction of the printing cylinder (1).
  • the feed drive (6) generates the x location coordinates and a pulse generator (16) mechanically coupled to the pressure cylinder (1) generates the y location coordinates.
  • the xy location coordinates are fed to an engraving control unit (18) via lines (17).
  • the engraving control unit (18) generates the raster signal R on the line (11), read addresses for the engraving data memory (14) on an address bus (19) and signals for controlling and synchronizing the engraving sequence, for example a control signal SSi for the rotary drive (2) on a line (20) and a control signal SS 2 for the feed drive (6) on a line (21).
  • the engraving machine has an engraving stylus monitoring device (23) in which the functionality of the engraving stylus (4) of the engraving member (3) is automatically checked continuously during the engraving on the basis of the engraving control signal GS and in the event of damage to the engraving stylus (4), in particular in the event of a stylus break, a control signal KS is generated.
  • the functionality of the engraving stylus (4) is checked by examining harmonics in the engraving control signal GS that are characteristic of damage to the engraving stylus (4).
  • the engraving control signal GS is fed to the engraving stylus monitoring device (23) from the engraving amplifier (10) via a line (25).
  • the control signal KS which reaches the engraving control unit (18) via a line (24), switches the rotary drive (2) and the feed drive (6) on the lines (20, 21) by means of the control signals SSi and SS 2 in the event of a stylus break. to cancel the engraving.
  • the stylus break can be signaled acoustically or optically with the aid of the control signal KS.
  • the innovation has the advantage that by signaling a stylus break in order to save time, the engraving of a new printing cylinder (1) can be started immediately.
  • the engraving termination in the event of a stylus break also prevents damage to the engraving element (3) or to the engraving machine itself, particularly in the case of an automatic engraving process.
  • Fig. 2 shows a basic embodiment for the engraving stylus monitoring device (23).
  • the engraving control current IQS supplied via the line (25) is converted at a measuring resistor (26) into a measuring voltage UM, which is passed through a capacitor (27) to separate the AC voltage component from an A / D converter ( 28) arrive and there is converted into measurement data MD.
  • the measurement data MD are fed via a measurement data bus (29) to a signal processor (30), which can preferably be designed as a digital signal processor (DSP), for example of the TMS 320C31 type from Texas Instruments.
  • DSP digital signal processor
  • the measurement data MD are continuously examined for superimposed harmonics and the frequency spectrum of the harmonics is determined, for example, by a Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • the determined frequency spectra are compared with a previously created and saved frequency spectrum, which is characteristic of an undamaged engraving stylus (4). If the frequency spectra do not match, the engraving stylus (4) is damaged and the control signal KS is generated on the line (24).
  • the determined frequency spectra can also be compared with a frequency spectrum that is characteristic of a damaged engraving stylus (4), in which case the correction signal KS is generated if the frequency spectra match.
  • Such Fourier transformations are known and are described, for example, in Rabbiner, LR: "Theory And Application Of Digital Signal Processing"; Cape. 6; 1975; ISBN 0-13-914101-4.
  • the ratio of the useful signal to the interference signal is advantageously reduced by filtering the harmonics to be analyzed from the measurement voltage UM using a suitable filter (31), the filtering taking place as a function of the frequency of the raster signal R.

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

Abstract

The invention relates to a method for engraving printing cylinders in an electronic engraving machine. An engraving control signal (GS) is formed from an image signal representing the tone values of the cup shapes to be engraved, and a periodic raster signal (R) for producing a printing raster. An engraving tool (4) of an engraving mechanism (3) that is controlled by the engraving control signal (GS) engraves a printing mould (8) in a rotating printing cylinder (1) in the form of cup shapes arranged in the printing raster. The operability of the engraving tool (4) is constantly monitored in an engraving tool monitoring device (23) while the rotating cylinder (1) is being engraved, by digitally filtering the engraving control signal (GS), especially by means of fast fournier transformation. In the event that damage is detected, especially a break in the engraving tool (4), a control signal (KS) that interrupts the engraving process or acoustically or optically signals the damage is produced.

Description

Verfahren zur Gravur von Druckzylindern Process for engraving printing cylinders
Die Erfindung bezieht sich auf das Gebiet der elektronischen Reproduktionstechnik und betrifft ein Verfahren zur Gravur von Druckzylindern in einer elektroni- sehen Graviermaschine, eine Gravierstichel-Überwachungsvorrichtung für eine elektronische Graviermaschine sowie eine elektronische Graviermaschine mit einer derartigen Gravierstichel-Überwachungsvorrichtung.The invention relates to the field of electronic reproduction technology and relates to a method for engraving printing cylinders in an electronic engraving machine, an engraving stylus monitoring device for an electronic engraving machine and an electronic engraving machine with such an engraving stylus monitoring device.
Aus der DE-C-25 087 34 ist bereits eine elektronische Graviermaschine zur Gra- vur von Druckzylindern mittels eines Gravierorgans bekannt. Das Gravierorgan mit einem durch ein Graviersteuersignal gesteuerten Gravierstichel als Schneidwerkzeug bewegt sich in axialer Richtung an einem rotierenden Druckzylinder entlang. Der Gravierstichel schneidet eine Folge von in einem Druckraster angeordneten Näpfchen in die Mantelfläche des Druckzylinders. Das Graviersteuersignal wird durch Überlagerung eines periodischen Rastersignals mit Bildsignalwerten gebildet, welche die zu reproduzierenden Tonwerte zwischen "Schwarz" und "Weiß" repräsentieren. Während das Rastersignal eine oszillierende Hubbewegung des Gravierstichels zur Gravur der in dem Druckraster angeordneten Näpfchen bewirkt, bestimmen die Bildsignalwerte entsprechend den zu reproduzierenden Tonwerten die Schnittiefen der gravierten Näpfchen.From DE-C-25 087 34 an electronic engraving machine for engraving printing cylinders by means of an engraving member is already known. The engraving member with an engraving stylus controlled by an engraving control signal as the cutting tool moves in the axial direction along a rotating printing cylinder. The engraving stylus cuts a series of cups arranged in a printing grid into the outer surface of the printing cylinder. The engraving control signal is formed by superimposing a periodic raster signal with image signal values which represent the tonal values to be reproduced between "black" and "white". While the raster signal causes an oscillating stroke movement of the engraving stylus to engrave the cells arranged in the printing raster, the image signal values determine the depths of cut of the engraved cells in accordance with the tonal values to be reproduced.
In der DE-A-23 36 089 ist ein Gravierorgan angegeben, das im wesentlichen aus einem Drehsystem und einem elektromagnetischen Antrieb für das Drehsystem besteht. Das Drehsystem weist eine Welle, einen Anker, ein Lager für die Welle, ein Rückstellelement und eine Dämpfungsvorrichtung auf. An der Welle ist ein hebeiförmiger Stichelhalter angebracht, der den Gravierstichel trägt. Der elektromagnetische Antrieb für das Drehsystem weist einen mit dem Graviersteuersignal beaufschlagten, stationären Elektromagneten auf, in dessen Luftspalt sich der Anker des Drehsystems bewegt. Der Antrieb bewirkt eine um kleine Winkel oszil- lierende Drehbewegung der Welle, und der Stichelhalter mit dem Gravierstichel führt zur Gravur der Näpfchen eine entsprechende oszillierende Hubbewegung in Richtung der Mantelfläche des Druckzylinders aus. In der Praxis kommt es gelegentlich vor, daß der Gravierstichel während der Gravur eines Druckzylinder beispielsweise durch Abnutzung oder durch mechanische Überbeanspruchung beschädigt wird oder sogar abbricht. In diesem Fall ist der teilgravierte Druckzylinder als Druckform unbrauchbar, und es muß ein neuer Druckzylinder graviert werden. Eine Beschädigung oder ein Bruch des Gravierstichels verursacht somit in nachteiliger Weise einen Zeitverlust bei der Druckformherstellung, der insbesondere bei der Gravur von Druckzylindern für den Verpak- kungs-oder Dekordruck erheblich sein kann, da die Gravur solcher Druckzylinder mehrere Stunden dauern kann.DE-A-23 36 089 specifies an engraving element which essentially consists of a rotating system and an electromagnetic drive for the rotating system. The rotating system has a shaft, an armature, a bearing for the shaft, a restoring element and a damping device. A lever-shaped stylus holder is attached to the shaft and carries the engraving stylus. The electromagnetic drive for the rotary system has a stationary electromagnet to which the engraving control signal is applied, in the air gap of which the armature of the rotary system moves. The drive causes the shaft to rotate by a small angle, and the stylus holder with the engraving stylus carries out a corresponding oscillating stroke movement in the direction of the outer surface of the printing cylinder for the engraving of the cups. In practice it occasionally happens that the engraving stylus is damaged or even breaks off during the engraving of a printing cylinder, for example due to wear or mechanical overloading. In this case the partially engraved printing cylinder is unusable as a printing form and a new printing cylinder must be engraved. Damage or breakage of the engraving stylus thus disadvantageously causes a loss of time in the production of the printing form, which can be considerable, in particular when engraving printing cylinders for packaging or decorative printing, since the engraving of such printing cylinders can take several hours.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Gravur von Druckzylindern in einer elektronischen Graviermaschine, eine Gravierstichel- Überwachungsvorrichtung für eine elektronische Graviermaschine sowie eine elektronische Graviermaschine mit einer derartigen Gravierstichel-Überwachungs- Vorrichtung anzugeben, mit denen der Zeitverlust bei der Druckformherstellung, der im Fall einer Beschädigung eines Gravierstichels während der Gravur entsteht, in vorteilhafter Weise verringert wird.The invention is therefore based on the object of specifying a method for engraving printing cylinders in an electronic engraving machine, an engraving stylus monitoring device for an electronic engraving machine and an electronic engraving machine with such an engraving stylus monitoring device, by means of which the loss of time during printing form production, the in the event of damage to an engraving stylus during the engraving, is advantageously reduced.
Diese Aufgabe wird bezüglich des Verfahrens zur Gravur von Druckzylindern durch die Merkmale des Anspruchs 1 , bezüglich der Gravierstichel-This object is achieved with respect to the method for engraving printing cylinders by the features of claim 1, with respect to the engraving stylus
Überwachungsvor-richtung durch die Merkmale des Anspruchs 10 und bezüglich der elektronischen Graviermaschine durch die Merkmale des Anspruchs 11 gelöst.Monitoring device solved by the features of claim 10 and with respect to the electronic engraving machine by the features of claim 11.
Vorteilhafte Weiterbildungen und Ausgestaltungen sind in den Unteransprüchen angegeben.Advantageous further developments and refinements are specified in the subclaims.
Die Erfindung wird nachfolgend anhand der Fig. 1 und 2 näher erläutert. Es zeigen:The invention is explained in more detail below with reference to FIGS. 1 and 2. Show it:
Fig. 1 ein Blockschaltbild einer elektronischen Graviermaschine mit einer Gravierstichel-Überwachungsvorrichtung und Fig. 2 ein prinzipielles Ausführungsbeispiel für eine Gravierstichel-Überwachungsvorrichtung.Fig. 1 is a block diagram of an electronic engraving machine with an engraving stylus monitoring device and Fig. 2 shows a basic embodiment for an engraving stylus monitoring device.
Fig. 1 zeigt ein Blockschaltbild einer elektronischen Graviermaschine, die bei- spielsweise ein HelioKlischograph® der Firma Hell Gravüre Systems GmbH, Kiel, DE, ist.Fig. 1 shows a block diagram of an electronic engraving machine, the game player, a HelioKlischograph ® from Hell Gravure Systems GmbH, Kiel, DE examples.
Ein Druckzylinder (1 ) wird von einem Rotationsantrieb (2) angetrieben. Ein Gravierorgan (3) mit einem Gravierstichel (4) als Schneidwerkzeug ist auf einem Gravierwagen (5) montiert, der mit Hilfe einer durch einen Vorschubantrieb (6) angetriebenen Spindel (7) in Achsrichtung des rotierenden Druckzylinders (1 ) bewegbar ist. Das Gravierorgan (3) ist beispielsweise mit einem elektromagnetischen Antrieb für den Gravierstichel (4) ausgerüstet. Der Gravierstichel (4) kann aber auch von einem Festkörper-Aktorelement aus einem piezoelektrischen oder magnetostriktiven Material gesteuert werden.A pressure cylinder (1) is driven by a rotary drive (2). An engraving element (3) with an engraving stylus (4) as a cutting tool is mounted on an engraving carriage (5) which can be moved in the axial direction of the rotating printing cylinder (1) with the aid of a spindle (7) driven by a feed drive (6). The engraving element (3) is equipped, for example, with an electromagnetic drive for the engraving stylus (4). The engraving stylus (4) can also be controlled by a solid-state actuator element made of a piezoelectric or magnetostrictive material.
Das Gravierorgan (3) graviert eine Druckform (8), indem der durch ein analoges Graviersteuersignal GS gesteuerte Gravierstichel (4) gravierlinienweise eine Folge von in einem Druckraster angeordneten Näpfchen in die Mantelfläche des Druckzylinders (1 ) schneidet, während sich der Gravierwagen (5) mit dem Gravierorgan (3) zur flächenhaften Gravur schrittweise oder kontinuierlich in axialer Richtung an dem rotierenden Druckzylinder (1 ) entlang bewegt.The engraving element (3) engraves a printing form (8) in that the engraving stylus (4), which is controlled by an analogue engraving control signal GS, cuts a series of engraving lines in the printing line (1) into the outer surface of the printing cylinder (1) while the engraving carriage (5) with the engraving element (3) for extensive engraving, step by step or continuously in the axial direction along the rotating printing cylinder (1).
Das Graviersteuersignal GS auf einer Leitung (9) wird in einem Gravierverstärker (10) durch Überlagerung eines periodischen Rastersignals R auf einer Leitung (11 ) mit einem Bildsignal B auf einer Leitung (12) erzeugt, welches die Tonwerte der zu gravierenden Näpfchen zwischen "Licht" und Tiefe" repräsentiert. Während das Rastersignal R eine oszillierende Hubbewegung des Gravierstichels (4) zur Gravur der in dem Druckraster angeordneten Näpfchen bewirkt, bestimmen die Bildsignalwerte B entsprechend den zu reproduzierenden Tonwerten die Schnit- tiefen der Näpfchen. Das Bildsignal B wird in einem D/A-Wandler (13) aus Gravurdaten GD der zu gravierenden Druckform (8) gewonnen. Die Gravurdaten GD sind in einem Gravurdatenspeicher (14) abgelegt, aus dem sie gravierlinienweise ausgelesen und dem D/A-Wandler (13) über einen Datenbus (15) zugeführt werden.The engraving control signal GS on a line (9) is generated in an engraving amplifier (10) by superimposing a periodic raster signal R on a line (11) with an image signal B on a line (12), which the tone values of the wells to be engraved between "light "and depth" represents. While the raster signal R causes an oscillating stroke movement of the engraving stylus (4) to engrave the wells arranged in the printing raster, the image signal values B determine the cutting depths of the wells in accordance with the tonal values to be reproduced D / A converter (13) obtained from engraving data GD of the printing form (8) to be engraved are stored in an engraving data memory (14), from which they are read out in engraving lines and fed to the D / A converter (13) via a data bus (15).
Die durch das Druckraster vorgegebenen Gravierorte der Näpfchen auf demThe engraving locations of the cells on the
Druckzylinder (1 ) sind durch die Ortskoordinaten (x, y) eines der Mantelfläche des Druckzylinders (1 ) zugeordneten Koordinatensystems definiert, dessen X-Achse in Achsrichtung und dessen Y-Achse in Umfangsrichtung des Druckzylinders (1 ) ausgerichtet sind. Der Vorschubantrieb (6) erzeugt die x-Ortskoordinaten und ein mit dem Druckzylinder (1 ) mechanisch gekoppelter Impulsgeber (16) die y-Orts- koordinaten. Die xy-Ortskoordinaten werden über Leitungen (17) einem Graviersteuerwerk (18) zugeführt. Das Graviersteuerwerk (18) erzeugt das Rastersignal R auf der Leitung (11 ), Leseadressen für den Gravurdatenspeicher (14) auf einem Adreßbus (19) sowie Signale zur Steuerung und Synchronisierung des Gravier- ablaufs, beispielsweise ein Steuersignal SSi für den Rotationsantrieb (2) auf einer Leitung (20) und ein Steuersignal SS2 für den Vorschubantrieb (6) auf einer Leitung (21 ).Printing cylinders (1) are defined by the spatial coordinates (x, y) of a coordinate system assigned to the lateral surface of the printing cylinder (1), the X axis of which is aligned in the axial direction and the Y axis is aligned in the circumferential direction of the printing cylinder (1). The feed drive (6) generates the x location coordinates and a pulse generator (16) mechanically coupled to the pressure cylinder (1) generates the y location coordinates. The xy location coordinates are fed to an engraving control unit (18) via lines (17). The engraving control unit (18) generates the raster signal R on the line (11), read addresses for the engraving data memory (14) on an address bus (19) and signals for controlling and synchronizing the engraving sequence, for example a control signal SSi for the rotary drive (2) on a line (20) and a control signal SS 2 for the feed drive (6) on a line (21).
Die Graviermaschine weist als Neuerung eine Gravierstichel-Überwachungsvor- richtung (23) auf, in der während der Gravur laufend die Funktionsfähigkeit des Gravierstichels (4) des Gravierorgans (3) anhand des Graviersteuersignals GS automatisch überprüft wird und in der im Falle einer Beschädigung des Gravierstichels (4), insbesondere im Fall eines Stichelbruchs, ein Kontrollsignal KS erzeugt wird. Die Überprüfung der Funktionsfähigkeit des Gravierstichels (4) erfolgt gemäß der Neuerung durch eine Untersuchung von für eine Beschädigung des Gravierstichels (4) charakteristischen Oberwellen im Graviersteuersignal GS. Das Graviersteuersignal GS wird der Gravierstichel-Überwachungsvorrichtung (23) von dem Gravierverstärker (10) über eine Leitung (25) zugeführt. Das Kontrollsignal KS, das über eine Leitung (24) an das Graviersteuerwerk (18) gelangt, schaltet im Fall einer Stichelbruchs den Rotationsantrieb (2) und den Vorschubantrieb (6) mittels der Steuersignale SSi und SS2 auf den Leitungen (20, 21 ) zwecks Abbruch der Gravur aus. Gleichzeitig oder alternativ kann der Stichelbruch mit Hilfe des Kontrollsignals KS akustisch oder optisch signalisiert werden.As an innovation, the engraving machine has an engraving stylus monitoring device (23) in which the functionality of the engraving stylus (4) of the engraving member (3) is automatically checked continuously during the engraving on the basis of the engraving control signal GS and in the event of damage to the engraving stylus (4), in particular in the event of a stylus break, a control signal KS is generated. According to the innovation, the functionality of the engraving stylus (4) is checked by examining harmonics in the engraving control signal GS that are characteristic of damage to the engraving stylus (4). The engraving control signal GS is fed to the engraving stylus monitoring device (23) from the engraving amplifier (10) via a line (25). The control signal KS, which reaches the engraving control unit (18) via a line (24), switches the rotary drive (2) and the feed drive (6) on the lines (20, 21) by means of the control signals SSi and SS 2 in the event of a stylus break. to cancel the engraving. Simultaneously or alternatively, the stylus break can be signaled acoustically or optically with the aid of the control signal KS.
Die Neuerung hat den Vorteil, daß durch die Signalisierung eines Stichelbruchs zwecks Zeitersparnis sofort mit der Gravur eines neuen Druckzylinders (1 ) begonnen werden kann. Durch den Gravurabbruch bei einem Stichelbruch wird außerdem, insbesondere bei einem automatischen Gravierablauf, verhindert, daß Schäden an dem Gravierorgan (3) oder an der Graviermaschine selbst auftreten können.The innovation has the advantage that by signaling a stylus break in order to save time, the engraving of a new printing cylinder (1) can be started immediately. The engraving termination in the event of a stylus break also prevents damage to the engraving element (3) or to the engraving machine itself, particularly in the case of an automatic engraving process.
Fig. 2 zeigt ein prinzipielles Ausführungsbeispiel für die Gravierstichel-Überwachungsvorrichtung (23). Bei einer Stromspeisung des Gravierorgans (3) wird der über die Leitung (25) zugeführte Graviersteuerstrom IQS an einem Meßwiderstand (26) in eine Meßspannung UM umgewandelt, die über einen Kondensator (27) zur Abtrennung des Wechselspannungsanteils an einen A/D-Wandler (28) gelangen und dort in Meßdaten MD umgewandelt wird. Die Meßdaten MD werden über einen Meßdatenbus (29) einem Signalprozessor (30) zugeführt, der vorzugsweise als Digitaler Signalprozessor (DSP) beispielsweise vom Typ TMS 320C31 der Firma Texas Instruments, ausgebildet sein kann.Fig. 2 shows a basic embodiment for the engraving stylus monitoring device (23). When the engraving element (3) is supplied with current, the engraving control current IQS supplied via the line (25) is converted at a measuring resistor (26) into a measuring voltage UM, which is passed through a capacitor (27) to separate the AC voltage component from an A / D converter ( 28) arrive and there is converted into measurement data MD. The measurement data MD are fed via a measurement data bus (29) to a signal processor (30), which can preferably be designed as a digital signal processor (DSP), for example of the TMS 320C31 type from Texas Instruments.
In dem Signalprozessor (30) werden die Meßdaten MD laufend auf überlagerte Oberwellen untersucht und beispielsweise durch eine Fast-Fourier-Transformation (FFT) das Frequenzspektrum der Oberwellen festgestellt. Die festgestellten Frequenzspektren werden mit einem zuvor erstellten und abgespeicherten Frequenz- spektrum verglichen, das für einen unbeschädigten Gravierstichel (4) charakteristisch ist. Bei Nichtübereinstimmung der Frequenzspektren liegt eine Beschädigung des Gravierstichels (4) vor, und es wird das Kontrollsignal KS auf der Leitung (24) erzeugt. Alternativ können die festgestellten Frequenzspektren auch mit einem für einen beschädigten Gravierstichel (4) charakteristischen Frequenz- spektrum verglichen werden, wobei in diesem Fall das Korrektursignal KS bei Übereinstimmung der Frequenzspektren erzeugt wird. Derartige Fourier-Transformationen sind bekannt und beispielsweise in Rabbiner, L.R.: "Theory And Application Of Digital Signal Processing"; Kap. 6; 1975; ISBN 0-13-914101-4, beschrieben.In the signal processor (30), the measurement data MD are continuously examined for superimposed harmonics and the frequency spectrum of the harmonics is determined, for example, by a Fast Fourier Transform (FFT). The determined frequency spectra are compared with a previously created and saved frequency spectrum, which is characteristic of an undamaged engraving stylus (4). If the frequency spectra do not match, the engraving stylus (4) is damaged and the control signal KS is generated on the line (24). Alternatively, the determined frequency spectra can also be compared with a frequency spectrum that is characteristic of a damaged engraving stylus (4), in which case the correction signal KS is generated if the frequency spectra match. Such Fourier transformations are known and are described, for example, in Rabbiner, LR: "Theory And Application Of Digital Signal Processing"; Cape. 6; 1975; ISBN 0-13-914101-4.
Zu Verbesserung der Oberwellenanalyse wird in vorteilhafter Weise das Verhältnis von Nutzsignal zum Störsignal verkleinert, indem die zu analysierenden Oberwellen mittels eines geeigneten Filters (31 ) aus der Meßspannung UM herausgefiltert werden, wobei die Filterung in Abhängigkeit von der Frequenz des Rastersignals R erfolgt. To improve the harmonic analysis, the ratio of the useful signal to the interference signal is advantageously reduced by filtering the harmonics to be analyzed from the measurement voltage UM using a suitable filter (31), the filtering taking place as a function of the frequency of the raster signal R.

Claims

Patentansprüche claims
1. Verfahren zur Gravur von Druckzylindern in einer elektronischen Graviermaschine, bei dem - ein Graviersteuersignal (GS) aus einem Bildsignal, welches die Tonwerte von zu gravierenden Näpfchen repräsentiert, und einem periodischen Rastersignal (R) zur Erzeugung eines Druckrasters gebildet wird und1. A method for engraving printing cylinders in an electronic engraving machine, in which - an engraving control signal (GS) is formed from an image signal, which represents the tonal values of cells to be engraved, and a periodic raster signal (R) for generating a printing raster and
- ein durch das Graviersteuersignal (GS) gesteuerter Gravierstichel (4) eines Gravierorgans (3) gravierlinienweise eine Druckform (8) in Form von in dem Druckraster angeordneten Näpfchen in einen rotierenden Druckzylinder (1 ) graviert, dadurch gekennzeichnet, daß- A engraving stylus (4) of an engraving member (3) controlled by the engraving control signal (GS) engraves a printing form (8) in the form of cups arranged in the printing grid in a rotating printing cylinder (1), characterized in that
- während der Gravur laufend die Funktionsfähigkeit des Gravierstichels (4) des Gravierorgans (3) automatisch überprüft wird und- During the engraving, the functionality of the engraving stylus (4) of the engraving member (3) is automatically checked and
- bei einer festgestellten Beschädigung, insbesondere bei einem Bruch des Gravierstichels (4), ein Kontrollsignal (KS) erzeugt wird.- If damage is detected, in particular if the engraving stylus (4) breaks, a control signal (KS) is generated.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß eine festgestellte Beschädigung des Gravierstichels (4) durch das Kontrollsignal (KS) akustisch oder optisch signalisiert wird.2. The method according to claim 1, characterized in that a detected damage to the engraving stylus (4) by the control signal (KS) is signaled acoustically or optically.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß bei einer festgestellten Beschädigung des Gravierstichels (4) die Gravur des Druckzylinders (1 ) durch das Kontrollsignal (KS) abgebrochen wird.3. The method according to claim 1 or 2, characterized in that if the engraving stylus (4) is found to be damaged, the engraving of the printing cylinder (1) is interrupted by the control signal (KS).
4. Verfahren nach mindestens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Funktionsfähigkeit des Gravierstichels (4) des Gravierorgans (3) anhand des Graviersteuersignal (GS) überprüft wird.4. The method according to at least one of claims 1 to 3, characterized in that the functionality of the engraving stylus (4) of the engraving member (3) is checked using the engraving control signal (GS).
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß - das Graviersteuersignal (GS) auf für eine Beschädigung des Gravierstichels (4) charakteristische Oberwellen untersucht wird, und - bei Vorhandensein der charakteristischen Oberwellen das Kontrollsignal (KS) erzeugt wird.5. The method according to claim 4, characterized in that - the engraving control signal (GS) is examined for harmonics characteristic for damage to the engraving stylus (4), and - In the presence of the characteristic harmonics, the control signal (KS) is generated.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Untersuchung der Oberwellen des Graviersteuersignals (GS) durch eine digitale Filterung, vor-zugsweise einer Fast-Fourier-Transformation, erfolgt.6. The method according to claim 5, characterized in that the examination of the harmonics of the engraving control signal (GS) is carried out by digital filtering, preferably a Fast Fourier transform.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß7. The method according to claim 6, characterized in that
- das durch die digitale Filterung ermittelte Frequenzspektrum der Oberwel- len im Graviersteuersignal (GS) mit einem für einen unbeschädigten Gravierstichel (4) charakteristischen Frequenzspektrum verglichen wird und- The frequency spectrum of the harmonics determined by the digital filtering in the engraving control signal (GS) is compared with a frequency spectrum characteristic of an undamaged engraving stylus (4) and
- bei Abweichung der Frequenzspektren das Kontrollsignal (KS) erzeugt wird.- If the frequency spectra deviate, the control signal (KS) is generated.
8. Verfahren nach mindestens einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß zur Verkleinerung des Verhältnisses von Nutzsignal zum Störsignal die zu untersuchenden Oberwellen aus dem Graviersteuersignal (GS) herausgefiltert werden.8. The method according to at least one of claims 5 to 7, characterized in that the harmonics to be examined are filtered out of the engraving control signal (GS) to reduce the ratio of the useful signal to the interference signal.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die Filterung in Abhängigkeit von der Frequenz des Rastersignals erfolgt.9. The method according to claim 8, characterized in that the filtering is carried out as a function of the frequency of the raster signal.
10. Gravierstichel-Überwachungsvorrichtung für eine elektronische Graviermaschine zur Gravur von Druckzylindern (1 ) mittels eines durch ein Graviersteu- ersignal (GS) gesteuerten Gravierstichels (4), dadurch gekennzeichnet, daß10. Engraving stylus monitoring device for an electronic engraving machine for engraving printing cylinders (1) by means of an engraving stylus (4) controlled by an engraving control signal (GS), characterized in that
- die Gravierstichel-Überwachungsvorrichtung (23) mit dem Graviersteuersignal (GS) beaufschlagt ist,- The engraving control device (23) is acted upon by the engraving control signal (GS),
- das Graviersteuersignal (GS) durch eine digitale Filterung, vorzugsweise durch eine Fast-Fourier-Transformation, auf für eine Beschädigung des Gravierstichels (4) charakteristische Oberwellen untersucht wird, - das durch die digitale Filterung ermittelte Frequenzspektrum der Oberwellen mit einem für einen unbeschädigten Gravierstichel (4) charakteristischen Frequenzspektrum verglichen wird undthe engraving control signal (GS) is examined by digital filtering, preferably by a Fast Fourier transformation, for harmonics characteristic of damage to the engraving stylus (4), - The frequency spectrum of the harmonics determined by the digital filtering is compared with a frequency spectrum characteristic of an undamaged engraving stylus (4) and
- in der Gravierstichel-Überwachungsvorrichtung (23) bei Abweichung der Frequenzspektren ein eine festgestellte Beschädigung des Gravierstichels- In the engraving stylus monitoring device (23) in the event of a deviation in the frequency spectra, a detected damage to the engraving stylus
(4) signalisierendes Kontrollsignal (KS) erzeugt wird.(4) signaling control signal (KS) is generated.
11. Graviermaschine zur Gravur von Druckzylindern, bestehend aus einem rotationsfähig gelagerten Druckzylinder (1 ) und einem Gravierorgan (3) mit einem durch ein Graviersteuersignal (GS) gesteuerten Gravierstichel (4), welcher gravierlinienweise eine Folge von in einem Gravurraster angeordneten Näpfchen in den rotierenden Druckzylinder (1 ) eingraviert, wobei das Gravierorgan (3) zur flächenhaften Gravur axial an dem rotierenden Druckzylinder (1 ) entlang verschiebbar ist, dadurch gekennzeichnet, daß die Graviermaschine ei- ne Gravierstichel-Überwachungsvorrichtung (23) aufweist, welche während der Gravur laufend die Funktionsfähigkeit des Gravierstichels (4) des Gravierorgans (3) automatisch überprüft und bei einer festgestellten Beschädigung, insbesondere bei einem Bruch, des Gravierstichels (4) ein die festgestellte Beschädigung signalisierendes Kontrollsignal (KS) erzeugt.11. Engraving machine for engraving printing cylinders, consisting of a rotatably mounted printing cylinder (1) and an engraving element (3) with an engraving stylus (4) controlled by an engraving control signal (GS), which engraving line by row a sequence of cups arranged in an engraving grid in the rotating Printing cylinder (1) is engraved, the engraving member (3) being axially displaceable along the rotating printing cylinder (1) for areal engraving, characterized in that the engraving machine has an engraving stylus monitoring device (23) which continuously monitors the engraving during the engraving Functionality of the engraving stylus (4) of the engraving member (3) is automatically checked and, if damage is found, in particular in the event of breakage, the engraving stylus (4) generates a control signal (KS) which signals the damage detected.
12. Graviermaschine nach Anspruch 11 , dadurch gekennzeichnet, daß12. Engraving machine according to claim 11, characterized in that
- die Gravierstichel-Überwachungsvorrichtung (23) mit dem Graviersteuersignal (GS) beaufschlagt ist, in der- The engraving stylus monitoring device (23) with the engraving control signal (GS) is applied in the
- das Graviersteuersignal (GS) durch eine digitale Filterung, vorzugsweise durch eine Fast-Fourier-Transformation, auf für eine Beschädigung des- The engraving control signal (GS) by digital filtering, preferably by a Fast Fourier transform, for damage to the
Gravierstichels (4) charakteristische Oberwellen untersucht wird,Engraving (4) characteristic harmonics is examined,
- das durch die digitale Filterung ermittelte Frequenzspektrum der Oberwellen mit einem für einen unbeschädigten Gravierstichel (4) charakteristischen Frequenzspektrum verglichen wird und in der - bei Abweichung der Frequenzspektren das Kontrollsignal (KS) erzeugt wird. - The frequency spectrum of the harmonics determined by the digital filtering is compared with a frequency spectrum characteristic of an undamaged engraving stylus (4) and in which - if the frequency spectra deviate, the control signal (KS) is generated.
EP00983066A 1999-11-04 2000-10-27 Method for engraving printing cylinders Expired - Lifetime EP1230086B1 (en)

Applications Claiming Priority (3)

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DE19952995A DE19952995A1 (en) 1999-11-04 1999-11-04 Process for engraving printing cylinders
DE19952995 1999-11-04
PCT/DE2000/003791 WO2001032420A1 (en) 1999-11-04 2000-10-27 Method for engraving printing cylinders

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AU2008100847A4 (en) * 2007-10-12 2008-10-09 Bluescope Steel Limited Method of forming textured casting rolls with diamond engraving
US9372996B2 (en) 2014-05-15 2016-06-21 International Business Machines Corporation Protecting data owned by an operating system in a multi-operating system mobile environment

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US4087801A (en) * 1974-12-20 1978-05-02 Tokyo Shibaura Electric Co., Ltd. Apparatus for detecting damages of cutting tools
DE3029957C2 (en) * 1980-08-07 1983-05-11 Siemens AG, 1000 Berlin und 8000 München Device for determining the wear on cutting tools by evaluating the vibrations occurring on the cutting tool
US5440398A (en) * 1993-02-25 1995-08-08 Ohio Electronic Engravers, Inc. Error detection apparatus and method for use with engravers
US6362899B1 (en) 1993-02-25 2002-03-26 Mdc Max Daetwyler Ag Error detection apparatus and method for use with engravers
DE19722996A1 (en) 1997-06-02 1998-12-03 Heidelberger Druckmasch Ag Signal processing method
DE19801472A1 (en) 1998-01-16 1999-07-22 Heidelberger Druckmasch Ag Setting value reporting process for calibrating electronic engraving machine for engraving intaglio printing forms
JP4562051B2 (en) * 1999-11-30 2010-10-13 独立行政法人産業技術総合研究所 Signal processing apparatus and signal processing method for cutting tool with wear sensor

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JP3496027B2 (en) 2004-02-09
JP2003527256A (en) 2003-09-16

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