EP1596636B1 - Apparatus to fix an image using inductive coupling of energy - Google Patents

Apparatus to fix an image using inductive coupling of energy Download PDF

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Publication number
EP1596636B1
EP1596636B1 EP05009969A EP05009969A EP1596636B1 EP 1596636 B1 EP1596636 B1 EP 1596636B1 EP 05009969 A EP05009969 A EP 05009969A EP 05009969 A EP05009969 A EP 05009969A EP 1596636 B1 EP1596636 B1 EP 1596636B1
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EP
European Patent Office
Prior art keywords
inductor
printing
forme
modules
magnetic field
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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.)
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EP05009969A
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German (de)
French (fr)
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EP1596636A1 (en
Inventor
Johann Dieter Bierl
Thomas Kothmayr
Michael Wagner
Franz-Peter Weissgärber
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Manroland AG
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Manroland AG
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • H05B6/145—Heated rollers

Definitions

  • the invention relates to a device for inductive thermal energy coupling for fixing an image on an imaged by means of a digital imaging system rotating printing form according to the preamble of claim 1.
  • Such a device for digitally described and erasable offset printing forms in which a fixation, ie homogeneous heating of the printing form surface is made, for example, from DE 100 08 213 A1 already known.
  • the printing form is fixed for better durability, i. the color-guiding image parts are anchored to the printing form.
  • the fixing operation is carried out by means for inductively fixing the image information on the rotating printing form from a material suitable for induction heating in a particularly advantageous manner in the middle frequency range from 100 kHz to 500 kHz.
  • the previously applied image information (in the present case from a thermal material) is stabilized.
  • a suitable induction generator comprises at least one supply unit, which is arranged stationary in or on the printing press and is coupled to a radio-frequency (HF) part by means of radio frequency-suitable supply lines (HF lines).
  • HF radio frequency-suitable supply lines
  • Each HF section forms a unit with one inductor each and forms a resonant circuit with it.
  • Each inductor comprises at least one, preferably two inductor loops, each of which is arranged on the front side of an HF part.
  • the inductor loops are preferably aligned parallel to the circumferential direction of the respective printing forme cylinder and approximately simulated in the curvature of the respective cylinder surface, so that they describe a coaxial shell relative to the rotating printing forme cylinder and bring in annular heat or just according to the Induktorform, d. H.
  • the length of the expansion in the circumferential direction according to an on / off very precisely bring to the respective cylinder surface heat.
  • inductor i. an inductor loop
  • inductor loop in the form of a pressure-form-wide hairpin inductor (line inductor) in the sense of a homogeneous heat input into the respective cylinder surface.
  • the inductor loop could have an inclination to the circumferential direction of the printing forme cylinder in order to take into account a format variability of the printing form can.
  • induction heating the energy is transferred to the printing plate through the alternating magnetic field that forms around the inductor loop, the is traversed by a high-frequency alternating current.
  • This type of energy transmission corresponds to the transformer principle, but the usual high coupling levels can not be achieved there.
  • the energy transfer and thus the heating of the printing form takes place only in the immediate vicinity of the inductor to the printing plate.
  • the current density distribution in the printing form is influenced by two effects.
  • self-induction in the interior of the printing plate generates eddy currents which overlap the primary current and lead to a current displacement at the printing plate surface. With increasing frequency, the current flows in increasingly thinner layers below the printing plate surface. This phenomenon is known as the skin effect.
  • around the current-carrying zones of the printing form forms an alternating magnetic field, which is superimposed on the alternating magnetic field of the inductor. This leads to an additional current displacement in the printing plate and in the inductor. This is known as approach or proximity effect and has the consequence that with increasing distance between inductor and printing form, the heating zone is wider.
  • the energy transfer there must be very high and as low as possible in the surrounding areas of the printing plate. Since, as explained above, the actual energy transfer takes place through the alternating magnetic field, the magnetic flux density in the zones to be heated must be very high and as low as technically feasible in the environment which is not to be heated. This overall improves the coupling factor.
  • Object of the present invention is therefore to improve a device described above for inductive thermal energy device for fixing an image so that the zone of energy transfer and thus the heating zone in their spread in the printing form is specifically designed so that zonal at the point, the is to be heated, in the printing form, a high magnetic flux density can be introduced, and that the energy input can be achieved regardless of the diameter of the rotating printing plate.
  • FIG. 1 shows in section an inductor 2 with an inductor loop 2 a, 2 b, the tangential to form a minimum gap 11 on the Druckformoberf kaue 1 at one of the contact points 24 a, b, 25 a, b ( Fig. 3 ) is aligned.
  • a current-carrying conductor loop 2 a, 2 b is guided by means of a copper tube and embedded in the magnetic field leading block 3 of the inductor 2.
  • Each module 3 has at least two end faces 6a, 6b of a pole piece, in the illustrated embodiment, the module 3 is formed in E-shape, so that three end faces 6a, 6b, 6c of the pressure surface 1 and between the end faces 6a, b, c the conductor loop 2a, b is guided.
  • the space in which a magnet exerts a force is known as the magnetic field.
  • an alternating magnetic field 4 a, 4 b is formed around the inductor 2, which in turn forms current-carrying zones on the printing plate and forms the heating zones 5 a, 5 b on the printing form surface 1.
  • the module or components 3 are intended according to the invention to consist of a material with high permeability. Particularly suitable for this are ferrites, i. Sintered electrotechnical special masses with increased specific resistance of the core material. They are known to be used in particular to reduce in the cores of the coils of transformers which occurs at high frequencies more prominent losses occurring.
  • Ferrites are oxide sintered materials such as MeO.Fe 2 O 3 , where Me may be, for example, Cn, Mg, Ba, Zn, Cd, Mn, Co or Ni.
  • FIG. 2 is the E-shaped component 3 as the conductor loop 2a, 2b everted pole piece with four end faces 7a, 7b, 7c, 7d, each with two end faces 7a, 7c and 7b, 7d aligned perpendicular to the printing plate surface 1 facing each other between them forms a magnetic field 4a, 4b, so that there heating zones 5a, 5b are significantly reduced in width over a smaller gap 11 because of the highly compressed magnetic field 4a, 4b.
  • the permeability is the product of the magnetic field constant and the permeability of the material.
  • FIG. 3 shows the inductor 20 according to the invention in V-shape.
  • the V-shape is carried out by means of two legs 20a, 20b, which are just made tangentially V-shaped to the Durckformober Design 1, wherein the legs 20a, 20b are connected to form the pressure mold surface 1 encompassing V together.
  • Each leg 20a, 20b of the V-shape results for each possible printing-plate diameter, for example indicated by 21 and 22, a contact point 24a or 25a or 24b or 25b, at which the conditions for the energy coupling are optimal. If this inductor mold is additionally equipped according to the invention with the above-described materials which have a high permeability, the properties of the independence of the printing plate diameter can (Format variability) and the design of the heating zones 5a, 5b are optimally combined on the printing form surface.
  • FIG. 4 clarifies again that each leg 2, 20 of the inductor 2 is composed of a plurality of identical components 3 as a link chain.
  • Each module 3 is a commercial E-shaped ferrite whose magnetic poles forming end faces 6a, b, c or 7a-d are ausgestaltbar in the manner described above.
  • any suitable end face design is conceivable, but at least two end faces are required to provide space for a magnetic field, which in turn forms heating zones.
  • an inductor 2, 20 with two inductor loops, which are each formed in a V-shape parallel to the circumferential direction of the bruckformober Assembly executed.
  • other forms of inductor or inductor loops are conceivable for different applications.
  • the Indian DE 100 08 213 A1 described structure of a device for inductive energy coupling for heating of printing plates can therefore be extended to the V-shape for the Induktorschleifen.
  • all embodiments of an inductor described there can be equipped with materials according to the invention which have a high permeability.
  • RF part and inductor would not be a structural unit, it may also be the RF part stationary in the printing press and be coupled via flexible lines to the traversable inductor.
  • RF part and inductor would not be a structural unit, it may also be the RF part stationary in the printing press and be coupled via flexible lines to the traversable inductor.
  • many, necessary on the individual units protectors, finger guard rods, emergency stop switch, etc. are provided.
  • it is provided to integrate the inductor in the finger guard in the nip between a printing plate on a printing form cylinder and a blanket cylinder, so that a particularly space-saving variant would be executable.
  • the present device for inductive thermal energy coupling is in particular intended for a printing plate imaged by a laser-induced thermo-transfer method, but it is also conceivable to use it elsewhere in the printing machine, e.g. in the form of an inductively heated dryer to cover the heat demand.
  • the imaging unit is on and off by means of a special mechanism on the one hand the printing form and on the other hand, if the printing cylinder are offset from each other, for example in the sense of observing a format variabiliquestioned the printing form, of course, the imaging unit is moved accordingly.
  • the inductor is mitverfahrbar, to which it is assigned in an advantageous manner in connection with its RF part of the imaging unit.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Fixing For Electrophotography (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Description

Die Erfindung betrifft eine Einrichtung zur induktiven thermischen Energieeinkopplung zum Fixieren eines Bildes auf einer mittels eines digitalen Bebilderungssystems bebilderten rotierenden Druckform gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for inductive thermal energy coupling for fixing an image on an imaged by means of a digital imaging system rotating printing form according to the preamble of claim 1.

Eine derartige Einrichtung für digital beschriebene und wieder löschbare OffsetDruckformen, bei dem eine Fixierung, d.h. homogene Erwärmung der Druckformoberfläche vorgenommen wird, ist beispielsweise aus der DE 100 08 213 A1 bereits bekannt.Such a device for digitally described and erasable offset printing forms, in which a fixation, ie homogeneous heating of the printing form surface is made, for example, from DE 100 08 213 A1 already known.

Dort wird nach der Bebilderung aus dem digitalen Datenbestand die Druckform zur besseren Haltbarkeit fixiert, d.h. die farbführenden Bildteile werden mit der Druckform verankert. Dazu wird der Fixiergang durch Mittel zum induktiven Fixieren der Bildinformationen auf der rotierenden Druckform aus einem für die lnduktionserwärmung geeigneten Material in besonders vorteilhafter Weise im Mittelfrequenzbereich von 100 kHz bis 500 kHz vorgenommen.There, after imaging from the digital database, the printing form is fixed for better durability, i. the color-guiding image parts are anchored to the printing form. For this purpose, the fixing operation is carried out by means for inductively fixing the image information on the rotating printing form from a material suitable for induction heating in a particularly advantageous manner in the middle frequency range from 100 kHz to 500 kHz.

Bei der Energieeinkopplung durch Induktion wird durch Wechselstrom hoher Frequenz eine Erwärmung im Inneren der metallischen Druckform hervorgerufen. Durch den sog. Skin-Effekt kann man bekanntlich die Erwärmung durch hohe Frequenzen entweder stark an die Oberfläche oder aber durch niedrigere Frequenzen weiter in das Innere des Materials legen. Die Energieeinkopplung wird hierbei zonal beschränkt, was besonders in Hinblick auf den Energieverbrauch vorteilhaft ist.In the case of energy coupling by induction, high frequency alternating current causes heating in the interior of the metallic printing plate. Due to the so-called "skin effect", it is known that the heating due to high frequencies can either be strongly applied to the surface or, due to lower frequencies, into the interior of the material. The energy input is zonal limited, which is particularly advantageous in terms of energy consumption.

Durch die Erwärmung der metallischen Druckform wird die zuvor aufgebrachte Bildinformation (im vorliegenden Falle aus einem Thermomaterial) stabilisiert.By heating the metallic printing plate, the previously applied image information (in the present case from a thermal material) is stabilized.

Der Aufbau eines geeigneten Induktionsgenerators umfasst mindestens eine Versorgungseinheit, die ortsfest in oder an der Druckmaschine angeordnet ist und mittels für Hochfrequenz geeignete Versorgungsleitungen (HF-Leitungen) an ein Hochfrequenz(HF)-Teil angekoppelt ist. Jedes HF-Teil bildet eine Baueinheit mit je einem Induktor und bildet mit diesem je einen Schwingkreis aus. Jeder Induktor umfasst mindestens eine, vorzugsweise zwei Induktorschleifen, die jeweils stirnseitig an einem HF-Teil angeordnet sind.The structure of a suitable induction generator comprises at least one supply unit, which is arranged stationary in or on the printing press and is coupled to a radio-frequency (HF) part by means of radio frequency-suitable supply lines (HF lines). Each HF section forms a unit with one inductor each and forms a resonant circuit with it. Each inductor comprises at least one, preferably two inductor loops, each of which is arranged on the front side of an HF part.

Die Induktorschleifen sind bevorzugt parallel zur Umfangsrichtung des jeweiligen Druckformzylinders ausgerichtet und in etwa der Krümmung der jeweiligen Zylinderoberfläche nachgebildet, so dass sie relativ zum rotierenden Druckformzylinder eine koaxiale Schale beschreiben und ringförmig Wärme einbringen oder eben entsprechend der Induktorform, d. h. der Länge der Ausdehnung in Umfangsrichtung entsprechend einer Ein-/Ausschaltung sehr zielgenau auf die jeweilige Zylinderoberfläche Wärme einbringen.The inductor loops are preferably aligned parallel to the circumferential direction of the respective printing forme cylinder and approximately simulated in the curvature of the respective cylinder surface, so that they describe a coaxial shell relative to the rotating printing forme cylinder and bring in annular heat or just according to the Induktorform, d. H. The length of the expansion in the circumferential direction according to an on / off very precisely bring to the respective cylinder surface heat.

Weitere Ausführungsbeispiele zeigen den Induktor, d.h. eine Induktorschleife, in Form eines druckformbreiten Haarnadelinduktors (Zeileninduktors) im Sinne einer homogenen Wärmeeinbringung in die jeweilige Zylinderoberfläche.Further embodiments show the inductor, i. an inductor loop, in the form of a pressure-form-wide hairpin inductor (line inductor) in the sense of a homogeneous heat input into the respective cylinder surface.

Andere Formen des Induktors bzw. Induktorschleifen sind jedoch für unterschiedliche Anwendungsfälle denkbar. So könnte die Induktorschleife eine Schrägstellung zur Umfangsrichtung des Druckformzylinders aufweisen, um auch eine Formatvariabilität der Druckform berücksichtigen zu können.However, other forms of inductor or inductor loops are conceivable for different applications. Thus, the inductor loop could have an inclination to the circumferential direction of the printing forme cylinder in order to take into account a format variability of the printing form can.

Bei der Induktionserwärmung erfolgt die Energieübertragung in die Druckform durch das magnetische Wechselfeld, das sich um die Induktorschleife bildet, die von einem hochfrequenten Wechselstrom durchflossen wird. Diese Art der Energieübertragung entspricht dem Transformatorprinzip, jedoch sind die dort üblichen hohen Kopplungsgrade nicht zu erreichen. Die Energieübertragung und damit die Erwärmung der Druckform erfolgt nur in der unmittelbaren Nähe des Induktors zur Druckform.In induction heating, the energy is transferred to the printing plate through the alternating magnetic field that forms around the inductor loop, the is traversed by a high-frequency alternating current. This type of energy transmission corresponds to the transformer principle, but the usual high coupling levels can not be achieved there. The energy transfer and thus the heating of the printing form takes place only in the immediate vicinity of the inductor to the printing plate.

Die Stromdichteverteilung in der Druckform wird durch zwei Effekte beeinflusst. Zum einen werden durch Selbstinduktion im Inneren der Druckform Wirbelströme erzeugt, die sich dem Primärstrom überlagern und zu einer Stromverdrängung an der Druckformoberfläche führen. Mit steigender Frequenz fließt der Strom in immer dünner werdenden Schichten unterhalb der Druckformoberfläche. Diese Erscheinung wird bekanntlich als Skin-Effekt bezeichnet. Zum anderen bildet sich um die stromdurchflossenen Zonen der Druckform ein magnetisches Wechselfeld, das sich dem magnetischen Wechselfeld des Induktors überlagert. Dadurch kommt es zu einer zusätzlichen Stromverdrängung in der Druckform und im Induktor. Das wird bekanntlich als Annäherungs- oder Nachbarschaftseffekt bezeichnet und hat zur Folge, dass mit größer werdendem Abstand zwischen Induktor und Druckform die Erwärmungszone breiter wird.The current density distribution in the printing form is influenced by two effects. On the one hand, self-induction in the interior of the printing plate generates eddy currents which overlap the primary current and lead to a current displacement at the printing plate surface. With increasing frequency, the current flows in increasingly thinner layers below the printing plate surface. This phenomenon is known as the skin effect. On the other hand, around the current-carrying zones of the printing form forms an alternating magnetic field, which is superimposed on the alternating magnetic field of the inductor. This leads to an additional current displacement in the printing plate and in the inductor. This is known as approach or proximity effect and has the consequence that with increasing distance between inductor and printing form, the heating zone is wider.

Um nun gezielt die Erwärmungszonen auf der Druckformoberfläche zu gestalten, muss die Energieübertragung dort sehr hoch und in den umliegenden Bereichen der Druckform möglichst gering sein. Da, wie zuvor erläutert, die eigentliche Energieübertragung durch das magnetische Wechselfeld erfolgt, muss in den zu erwärmenden Zonen die magnetische Flussdichte sehr hoch und in dem nicht zu erwärmenden Umfeld so gering wie technisch machbar sein. Dadurch wird insgesamt der Kopplungsfaktor verbessert.In order to specifically design the heating zones on the printing plate surface, the energy transfer there must be very high and as low as possible in the surrounding areas of the printing plate. Since, as explained above, the actual energy transfer takes place through the alternating magnetic field, the magnetic flux density in the zones to be heated must be very high and as low as technically feasible in the environment which is not to be heated. This overall improves the coupling factor.

Aufgabe vorliegender Erfindung ist es nun, eine eingangs beschriebene Einrichtung zur induktiven thermischen Energieeinrichtung zum Fixieren eines Bildes so zu verbessern, dass die Zone der Energieübertragung und damit die Erwärmungszone in ihrer Ausbreitung in der Druckform gezielt gestaltbar ist, so dass zonal an der Stelle, die erwärmt werden soll, in die Druckform eine hohe magnetische Flussdichte eingebracht werden kann, und dass die Energieeinkopplung unabhängig vom Durchmesser der rotierenden Druckform erzielt werden Kann.Object of the present invention is therefore to improve a device described above for inductive thermal energy device for fixing an image so that the zone of energy transfer and thus the heating zone in their spread in the printing form is specifically designed so that zonal at the point, the is to be heated, in the printing form, a high magnetic flux density can be introduced, and that the energy input can be achieved regardless of the diameter of the rotating printing plate.

Die Lösung der Aufgabe besteht in eine Einrichtung nach Anspruch 1. Nachstehend wird die Erfindung an einem Ausführungsbeispiel näher erläutert. In einer stark schematisierten Zeichnung zeigt:

Figur 1:
den prinzipiellen Aufbau eines erfindungsgemäßen Induktors aus Induktorschleife und dem diese umgebende, das Magnetfeld führende Bauteil zur thermischen Energieeinkopplung in die Druckformoberfläche,
Figur 2:
den Induktor gem. der Figur 1, jedoch mit variierler Abstandsgestaltung zwischen dem Magnetfeld führenden Bauteil und Druckformoberfläche,
Figur 3:
einen erfindungsgemäßen Induktor in V-Form zur Erzielung weiterer Berührungspunkte, und
Figur 4:
einen Induktor gem. der Figur 3, der aus einer Vielzahl baugleicher ferritischer Bausteine als Gliederkette, die die Induktorschleife umgeben, zusammengesetzt ist.
The solution of the problem consists in a device according to claim 1. The invention will be explained in more detail with reference to an embodiment. In a highly schematic drawing shows:
FIG. 1:
the basic structure of an inductor according to the invention inductor loop and the surrounding, the magnetic field leading component for thermal energy coupling into the printing plate surface,
FIG. 2:
the inductor gem. of the FIG. 1 but with variable spacing between the component carrying the magnetic field and the printing plate surface,
FIG. 3:
an inductor according to the invention in V-shape to achieve further points of contact, and
FIG. 4:
an inductor acc. of the FIG. 3 which is composed of a plurality of identically constructed ferritic components as a link chain surrounding the inductor loop.

Der grundsätzliche Aufbau eines Induktionsgenerators zur Erwärmung rotierender Druckformen ist bereits in der DE 100 08 213 A1 beschrieben. Deshalb wird in der folgenden Ausführungsbeschreibung lediglich auf die neuen konstruktiven Ausgestaltungen der gattungsbildenden Einrichtung eingegangen.The basic structure of an induction generator for heating rotary printing plates is already in the DE 100 08 213 A1 described. Therefore, in the following execution description will be discussed only on the new structural embodiments of the generic device.

Figur 1 zeigt im Schnitt einen Induktor 2 mit einer Induktorschleife 2a,2b, der tangential unter Ausbildung eines minimalen Spaltes 11 an der Druckformoberfäche 1 an einer der Berührungsstellen 24a,b;25a,b (Fig. 3) ausgerichtet ist. In den Induktor 2 ist eine stromdurchflossene Leiterschleife 2a, 2b mittels eines Kupferrohrs geführt und im das Magnetfeld führenden Baustein 3 des Induktors 2 eingebettet. Jeder Baustein 3 weist mind. zwei Stirnflächen 6a,6b eines Polschuhs auf, im gezeigten Ausführungsbeispiel ist der Baustein 3 in E-Form ausgebildet, so dass drei Stirnflächen 6a,6b,6c der Druckoberfläche 1 gegenüberstehen und zwischen den Stirnflächen 6a,b,c die Leiterschleife 2a,b geführt ist. Den Raum, in dem ein Magnet Kraftwirkung ausübt, nenn man bekanntlich magnetisches Feld. Durch den Stromfluss in der Leiterschleife 2a, 2b entsteht um den Induktor 2 ein magnetisches Wechselfeld 4a,4b, das in die Druckformoberfläche eingekoppelt wiederum stromdurchflossene Zonen auf der Druckform ausbildet und die Erwärmungszonen 5a, 5b auf der Druckformoberfläche 1 schafft. FIG. 1 shows in section an inductor 2 with an inductor loop 2 a, 2 b, the tangential to form a minimum gap 11 on the Druckformoberfäche 1 at one of the contact points 24 a, b, 25 a, b ( Fig. 3 ) is aligned. In the inductor 2, a current-carrying conductor loop 2 a, 2 b is guided by means of a copper tube and embedded in the magnetic field leading block 3 of the inductor 2. Each module 3 has at least two end faces 6a, 6b of a pole piece, in the illustrated embodiment, the module 3 is formed in E-shape, so that three end faces 6a, 6b, 6c of the pressure surface 1 and between the end faces 6a, b, c the conductor loop 2a, b is guided. The space in which a magnet exerts a force is known as the magnetic field. As a result of the current flow in the conductor loop 2 a, 2 b, an alternating magnetic field 4 a, 4 b is formed around the inductor 2, which in turn forms current-carrying zones on the printing plate and forms the heating zones 5 a, 5 b on the printing form surface 1.

Der bzw. die Bausteine 3 sollen erfindungsgemäß aus einem Material mit hoher Permeabilität bestehen. Besonders geeignet dafür sind Ferrite, d.h. gesinterte elektrotechnische Sondermassen mit erhöhtem spezifischem Widerstand des Kernmaterials. Sie dienen bekanntlich insbesondere dazu, um in den Kernen der Spulen von Transformatoren die bei hohen Frequenzen stärker in Erscheinung tretenden Verluste zu verringern.The module or components 3 are intended according to the invention to consist of a material with high permeability. Particularly suitable for this are ferrites, i. Sintered electrotechnical special masses with increased specific resistance of the core material. They are known to be used in particular to reduce in the cores of the coils of transformers which occurs at high frequencies more prominent losses occurring.

Ferrite sind aus Oxyden gesinterte Werkstoffe, wie z.B. MeO.Fe2O3, wobei Me in diesem Zusammenhang beispielsweise sein kann: Cn, Mg, Ba, Zn, Cd, Mn, Co oder Ni.Ferrites are oxide sintered materials such as MeO.Fe 2 O 3 , where Me may be, for example, Cn, Mg, Ba, Zn, Cd, Mn, Co or Ni.

Gemäss der Figur 2 ist das E-förmige Bauteil 3 als die Leiterschleife 2a,2b umstülpender Polschuh mit vier Stirnflächen 7a,7b,7c,7d angeführt, wobei sich jeweils zwei Stirnflächen 7a,7c und 7b,7d senkrecht zur Druckformoberfläche 1 ausgerichtet gegenüberstehen, zwischen diesen sich jeweils ein magnetisches Feld 4a,4b ausbildet, so dass dort Erwärmungszonen 5a, 5b über einen kleineren Spalt 11 wegen des stark komprimierten Magnetfelds 4a,4b deutlich in der Breite verringert sind.According to the FIG. 2 is the E-shaped component 3 as the conductor loop 2a, 2b everted pole piece with four end faces 7a, 7b, 7c, 7d, each with two end faces 7a, 7c and 7b, 7d aligned perpendicular to the printing plate surface 1 facing each other between them forms a magnetic field 4a, 4b, so that there heating zones 5a, 5b are significantly reduced in width over a smaller gap 11 because of the highly compressed magnetic field 4a, 4b.

Die Permeabilität ist das Produkt aus der magnetischen Feldkonstante und der Permeabilitätszahl des Werkstoffes. Durch Verwendung von Werkstoffen mit einer hohen Permeabilität für die die Leiterschleife 2a,2b umstülpenden Bausteine 3 und durch die Gestaltung der Bausteine 3, insbesondere der Ferrite, wie in Figur 1 und 2 verdeutlicht, kann das magnetische Wechselfeld 4a,b also viel gezielter in die Druckform eingekoppelt werden. Somit kann die Ausbreitung der Erwärmungszonen 5a, 5b auf der Druckformoberfläche 1 gezielt gestaltet werden.The permeability is the product of the magnetic field constant and the permeability of the material. By using materials with a high permeability for the modules 3 everting the conductor loop 2 a, 2 b, and by designing the components 3, in particular the ferrites, as in FIG FIGS. 1 and 2 illustrates, the alternating magnetic field 4a, b so much more targeted can be coupled into the printing plate. Thus, the propagation of the heating zones 5a, 5b on the printing plate surface 1 can be made targeted.

Weiterhin kann durch eine besonders vorteilhafte Form der Induktorschleife die Energieeinkopplung unabhängig vom Durchmesser der rotierenden Druckform realisiert werden. Figur 3 zeigt den erfindungsgemäßen Induktor 20 in V-Form. Die V-Form ist mittels zweier Schenkel 20a, 20b ausgeführt, die eben V-förmig an die Durckformoberfläche 1 tangential angestellt sind, wobei die Schenkel 20a, 20b zur Ausbildung des die Druckformoberfläche 1 umgreifenden V miteinander verbunden sind.Furthermore, the energy coupling can be realized independently of the diameter of the rotating printing forme by a particularly advantageous form of the inductor loop. FIG. 3 shows the inductor 20 according to the invention in V-shape. The V-shape is carried out by means of two legs 20a, 20b, which are just made tangentially V-shaped to the Durckformoberfläche 1, wherein the legs 20a, 20b are connected to form the pressure mold surface 1 encompassing V together.

Je Schenkel 20a, 20b der V-Form ergibt sich für jeden möglichen Druckformdurchmesser, beispielsweise durch 21 und 22 gekennzeichnet, ein Berührungspunkt 24a oder 25a bzw. 24b oder 25b, an denen die Bedingungen für die Energieeinkopplung optimal sind. Wird diese Induktorform zusätzlich erfindungsgemäß mit den voranbeschriebenen Werkstoffen, die eine hohe Permeabilität haben, ausgestattet, können die Eigenschaften der Unabhängigkeit von Druckformdurchmesser (Formatvariabilität) sowie die Gestaltung der Erwärmungszonen 5a, 5b auf der Druckformoberfläche optimal kombiniert werden.Each leg 20a, 20b of the V-shape results for each possible printing-plate diameter, for example indicated by 21 and 22, a contact point 24a or 25a or 24b or 25b, at which the conditions for the energy coupling are optimal. If this inductor mold is additionally equipped according to the invention with the above-described materials which have a high permeability, the properties of the independence of the printing plate diameter can (Format variability) and the design of the heating zones 5a, 5b are optimally combined on the printing form surface.

Figur 4 verdeutlicht nochmals, dass jeder Schenkel 2, 20 des Induktors 2 aus einer Vielzahl baugleicher Bausteine 3 als Gliederkette zusammengesetzt ist. Jeder Baustein 3 ist ein handelsüblicher in E-Form gefertigter Ferrit, dessen Magnetpole ausbildende Stirnflächen 6a,b,c oder 7a-d in vorbeschriebener Weise ausgestaltbar sind. Selbstverständlich ist jede geeignete Stirnflächengestaltung denkbar, jedoch mindestens zwei Stirnflächen sind erforderlich, um einen Raum für ein magnetisches Feld zu bieten, das wiederum Erwärmungszonen ausbildet. FIG. 4 clarifies again that each leg 2, 20 of the inductor 2 is composed of a plurality of identical components 3 as a link chain. Each module 3 is a commercial E-shaped ferrite whose magnetic poles forming end faces 6a, b, c or 7a-d are ausgestaltbar in the manner described above. Of course, any suitable end face design is conceivable, but at least two end faces are required to provide space for a magnetic field, which in turn forms heating zones.

Die gezielte Anpassung bzw. das Auffinden einer geeigneten Induktorform war ein wesentlicher Bestandteil vorliegender Erfindung. In besonders bevorzugter Weise ist ein Induktor 2, 20 mit zwei Induktorschleifen, die jeweils V-förmig parallel zur Umfangsrichtung der bruckformoberfläche ausgebildet sind, ausgeführt. Andere Formen des Induktors bzw. Induktorschleifen sind jedoch für unterschiedliche Anwendungsfälle denkbar.The targeted adaptation or finding a suitable Induktorform was an essential part of the present invention. In a particularly preferred manner, an inductor 2, 20 with two inductor loops, which are each formed in a V-shape parallel to the circumferential direction of the bruckformoberfläche executed. However, other forms of inductor or inductor loops are conceivable for different applications.

Der in der DE 100 08 213 A1 beschriebene Aufbau einer Einrichtung zur induktiven Energieeinkopplung zur Erwärmung von Druckformen kann also um die V-Form für die Induktorschleifen erweitert werden. Darüber hinaus können alle dort beschriebenen Ausführungsformen eines Induktors mit erfindungsgemäßen Werkstoffen, die über eine hohe Permeabilität verfügen, ausgestattet werden.The Indian DE 100 08 213 A1 described structure of a device for inductive energy coupling for heating of printing plates can therefore be extended to the V-shape for the Induktorschleifen. In addition, all embodiments of an inductor described there can be equipped with materials according to the invention which have a high permeability.

Um die gewünschte zonale Erwärmung über die gesamte Druckformoberfläche 1 zu erreichen, ist vorgesehen, den Induktor 2, 20 mit Induktorschleifen in Baueinheit mit einem HF-Teil in Achsrichtung der rotierenden Druckform 10 zu traversieren.In order to achieve the desired zonal heating over the entire printing plate surface 1, it is provided to traverse the inductor 2, 20 with inductor loops in assembly with an HF component in the axial direction of the rotating printing plate 10.

HF-Teil und Induktor müssten jedoch keine bauliche Einheit darstellen, es kann auch das HF-Teil ortsfest in der Druckmaschine angeordnet sein und über flexible Leitungen an den traversierbaren Induktor angekoppelt sein. Bekanntlich sind in einer Druckmaschine viele, an den einzelnen Aggregaten notwendige Schutze, Fingerschutzstangen, Notstoppschalter usw. vorgesehen. In einer vorteilhaften Ausführung ist vorgesehen, den Induktor im Fingerschutz in der Spaltzone zwischen einer Druckform auf einem Druckformzylinder und einem Gummituchzylinder zu integrieren, womit eine besonders platzsparende Variante ausführbar wäre.However, RF part and inductor would not be a structural unit, it may also be the RF part stationary in the printing press and be coupled via flexible lines to the traversable inductor. As is known, in a printing machine many, necessary on the individual units protectors, finger guard rods, emergency stop switch, etc. are provided. In an advantageous embodiment, it is provided to integrate the inductor in the finger guard in the nip between a printing plate on a printing form cylinder and a blanket cylinder, so that a particularly space-saving variant would be executable.

Die vorliegende Einrichtung zur induktiven thermischen Energieeinkopplung ist insbesondere für eine durch ein laserinduziertes Thermo-Transfer-Verfahren bebilderte Druckform gedacht, es ist jedoch auch denkbar, an anderer Stelle innerhalb der Druckmaschine z.B. in Form eines induktiv beheizten Trockners den Wärmebedarf zu decken.The present device for inductive thermal energy coupling is in particular intended for a printing plate imaged by a laser-induced thermo-transfer method, but it is also conceivable to use it elsewhere in the printing machine, e.g. in the form of an inductively heated dryer to cover the heat demand.

Bekanntlich ist die Bebilderungseinheit mittels einer speziellen Mechanik einerseits der Druckform an und abstellbar und andererseits wenn die Druckzylinder voneinander abstellbar sind, beispielsweise im Sinne der Beachtung einer Formatvariabiliät der Druckform, ist selbstverständlich die Bebilderungseinheit entsprechend mit verfahrbar. Genauso ist der Induktor mitverfahrbar, wozu er in vorteilhafter Weise in Verbindung mit seinem HF-Teil fest der Bebilderungseinheit zugeordnet ist.As is known, the imaging unit is on and off by means of a special mechanism on the one hand the printing form and on the other hand, if the printing cylinder are offset from each other, for example in the sense of observing a format variabiliät the printing form, of course, the imaging unit is moved accordingly. Likewise, the inductor is mitverfahrbar, to which it is assigned in an advantageous manner in connection with its RF part of the imaging unit.

Claims (9)

  1. A device for inductively coupling in thermal energy for fixing an image on a rotating printing forme, imaged by means of a digital imaging system, from a material suitable for induction heating, comprising at least one inductor (20) with at least one induction loop (2a, 2b), a high-frequency (HF) portion which together with the inductor (20) forms an oscillating circuit, and a supply portion that can be coupled by means of supply lines that are suitable for high frequency (HF-lines), wherein each inductor loop (2a, 2b) is aligned in an elongated form parallel to the circumferential direction of the rotating printing forme, characterised in that the inductor (20) is constructed in the form of two legs (20a, 20b) in such a V-shaped manner that each leg (20a, 20b) is set tangentially against a printing-forme surface (1) of the printing forme, wherein the legs (20a, 20b) are connected together in order to form the V-shape, wherein each leg (20a, 20b) of the inductor (20) has inductor loops (2a, 2b) that have slipped around them modules (3) conducting a magnetic field and formed from a material of high permeability, wherein the modules (3) each have at least two end faces (6a, 6; 7a, 7c, 7b, 7d) coupling energy of a magnetic field (4a, 4b) into the printing-forme surface (1).
  2. A device according to claim 1, characterised in that the inductor (2, 20) is composed of a plurality of structurally identical modules (3) which as a link chain are slipped around the inductor loop (2a, b).
  3. A device according to claim 1, characterised in that a plurality of, in particular two, inductor loops (2a, b) are provided per inductor (2, 20).
  4. A device according to one of the preceding claims, characterised in that the modules (3) conducting the magnetic field are ferrites.
  5. A device according to claim 1 to 4, characterised in that the modules (3) are commercially available ferrites in an E-shape which have at least three end faces (6a, b, c) pointing towards the printing-forme surface (1).
  6. A device according to claim 1 to 4, characterised in that the modules (3) are ferrites in an E-shape that have four end faces (7a-d) in order to compress the magnetic fields (4a, b) and diminish the heating zones (5a, b).
  7. A device according to claim 1, characterised in that in order to heat the printing-forme surface (1) in a homogeneous and zonal manner, the inductor (2, 20) can be traversed in the axial direction of the rotating printing forme (10).
  8. A device according to claim 1, characterised in that the HF-portion is arranged in a stationary manner in the printing machine and can be connected to the inductor by way of flexible lines.
  9. A device according to claim 1, characterised in that the HF-portion forms a structural unit with the inductor and can likewise be traversed in the axial direction of the rotating printing forme (10).
EP05009969A 2004-05-11 2005-05-06 Apparatus to fix an image using inductive coupling of energy Not-in-force EP1596636B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004023127 2004-05-11
DE102004023127A DE102004023127B3 (en) 2004-05-11 2004-05-11 Device for inductive thermal energy injection for fixing an image

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EP1596636A1 EP1596636A1 (en) 2005-11-16
EP1596636B1 true EP1596636B1 (en) 2009-12-02

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US (1) US7411164B2 (en)
EP (1) EP1596636B1 (en)
JP (1) JP4299265B2 (en)
CN (1) CN1701957A (en)
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DE (2) DE102004023127B3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009010625A1 (en) * 2009-02-26 2010-09-09 OCé PRINTING SYSTEMS GMBH Device for drying a printed print carrier web, comprises a revolvably arranged drying roller with a mantle area made of inductively-heatable material that contacts the print carrier web to be dried, and a magnetic field generator
CN105705317B (en) * 2013-11-29 2018-09-28 利乐拉瓦尔集团及财务有限公司 Induction heating apparatus
DE102015200114B4 (en) * 2015-01-08 2018-12-20 Koenig & Bauer Ag Method for reusing a printing plate

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Publication number Priority date Publication date Assignee Title
US3526704A (en) * 1965-11-09 1970-09-01 Heller William C Jun Method and apparatus for color printing and the like
SE422136B (en) * 1979-10-23 1982-02-15 Tetra Pak Int DEVICE FOR SEALING THERMOPLAST COATED PACKAGING MATERIAL
DE69132177T2 (en) * 1990-11-30 2000-12-21 Nordson Corp Induction dryer and magnetic separator
JP2000188177A (en) 1998-12-21 2000-07-04 Fuji Xerox Co Ltd Electromagnetic induction heating device and image recording device using it
DE10008213B4 (en) 2000-02-23 2005-12-08 Man Roland Druckmaschinen Ag Device for thermal energy coupling
US6721530B2 (en) 2001-03-28 2004-04-13 Hewlett-Packard Development Company, L.P. Fusing system having electromagnetic heating

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DE502005008605D1 (en) 2010-01-14
JP2005324549A (en) 2005-11-24
JP4299265B2 (en) 2009-07-22
US7411164B2 (en) 2008-08-12
CA2507087A1 (en) 2005-11-11
DE102004023127B3 (en) 2006-02-02
US20050264631A1 (en) 2005-12-01
EP1596636A1 (en) 2005-11-16
CA2507087C (en) 2008-12-23
CN1701957A (en) 2005-11-30

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