EP0367048B1 - Printing form with parts that can be repeatedly activated and removed - Google Patents

Printing form with parts that can be repeatedly activated and removed Download PDF

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Publication number
EP0367048B1
EP0367048B1 EP89119545A EP89119545A EP0367048B1 EP 0367048 B1 EP0367048 B1 EP 0367048B1 EP 89119545 A EP89119545 A EP 89119545A EP 89119545 A EP89119545 A EP 89119545A EP 0367048 B1 EP0367048 B1 EP 0367048B1
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EP
European Patent Office
Prior art keywords
printing
areas
printing forme
switch elements
semi
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.)
Expired - Lifetime
Application number
EP89119545A
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German (de)
French (fr)
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EP0367048A3 (en
EP0367048A2 (en
Inventor
Albert Engl
Peter Meinke
Herbert Stöckl
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0367048A2 publication Critical patent/EP0367048A2/en
Publication of EP0367048A3 publication Critical patent/EP0367048A3/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1058—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by providing a magnetic pattern, a ferroelectric pattern or a semiconductive pattern, e.g. by electrophotography

Definitions

  • the invention relates to a printing form for a printing press with areas which can be activated and deleted repeatedly and which, after activation, are ink-accepting.
  • a semiconductor layer arranged on a carrier which has grid-shaped capacitive or inductive areas in the form of capacitors or inductors, each of which can be charged or excited by a selectively controllable electronic switching element and the density of the areas at least 160 switching elements per mm2 lies.
  • the invention makes it possible to bring the print motif created in an editorial terminal directly onto the electronically activated forme cylinder.
  • the production and clamping of a conventional printing plate is therefore no longer necessary.
  • the motif to be printed can be changed during operation from the editorial terminal.
  • the device according to the invention is space-saving and optimally protected against environmental influences.
  • the semiconductor layer preferably consists of a thin silicon-containing layer, as is known from computer technology, it being possible for these transistor / capacitor or transistor / inductance patterns to be introduced by conventional diffusion methods.
  • the individual transistors can be controlled by a computer (stationary or in the forme cylinder) by means of an address bus.
  • the transistors which preferably form the electronic switching elements in the semiconductor layer, are driven by a data bus which can transmit switching commands (on / off) and by a supply bus.
  • the electrostatic or capacitive or magnetic patterns built up element by element then serve to adhere suitable ink, such as ferro-fluid ink or electrostatically charged ink or toner, directly or via a protective layer arranged on the semiconductor layer, in accordance with the motif to be printed.
  • This protective layer should be wear-resistant.
  • the printing form according to the invention is used on a so-called forme cylinder 3, which is rotatably mounted between two side walls 1, 2 of a printing unit and can be set in rotation in the usual way by electric motors or by a gear drive.
  • a blanket cylinder 4 can be placed on the form cylinder 3 if an offset printing process is to be used.
  • a paper web to be printed not shown here, is passed between the blanket cylinder and another cylinder 5 acting as an impression cylinder.
  • the blanket cylinder 4 is unnecessary, so that an impression cylinder can be placed directly on the form cylinder 3 carrying the printing form according to the invention and the paper web or printing medium to be printed can be passed between them in the form of sheets.
  • the forme cylinder 3 carries the printing form 6 according to the invention, which preferably consists of a thin semiconductor material such as silicon.
  • the cylinder 4 is provided with a rubber blanket 7 or a rubber sleeve.
  • Fig. 2 shows the semiconductor layer 6 forming the printing form according to the invention in two dimensions, i.e. in the form of a plate. It goes without saying that the semiconductor layer 6 can also be tubular, so that continuous printing is possible. The semiconductor layer can also be firmly applied directly to the forme cylinder.
  • the individual areas are arranged in columns 9, 10, 11 and rows 12, 13, 14. This results in an advantageous control of the capacitances 15 arranged in a matrix in FIG. 2 with the aid of the electronic switching elements in the form of transistors 16.
  • the latter can be field effect transistors or so-called MOS transistors (metal oxide silicon transistors) in the usual way and each have a sink electrode 17, a source electrode 18 and a control electrode or gate electrode 19.
  • MOS transistors metal oxide silicon transistors
  • the latter are usually referred to as drain electrodes, source electrodes and gate electrodes.
  • a capacitance 15 can be connected in series, so that the associated capacitance 15 is loaded when the transistor 16 is switched on. Discharging the transistors is possible in a simple manner by applying corresponding voltages or ground potentials.
  • the transistors can be used in the semiconductor layer 6 by appropriate doping or conductor track routing.
  • the driver lines for example the driver line 22 in the row 12 and the column driver line 27, and by controlling the associated gate electrode via the line 24, the upper region shown on the left in the form of a capacitance 15 can be loaded in FIG. 2. This charge can be kept permanently during operation by maintaining or maintaining the applied operating voltage.
  • FIG. 3 shows a section 34 of a semiconductor layer on which a transistor 29 with source electrodes 31 and sink electrode 30 and a gate electrode 32 is indicated.
  • an inductor 33 which is meandering or zigzag-shaped.
  • the transistor 29 is switched on, the current controllable via the transistor 29 flows through the inductance 33, so that a corresponding magnetic field is created, by means of which color particles of, for example, a ferro-fluid color can be attracted, in accordance with the motif to be printed.
  • the transistor 29 has to be permanently activated, ie switched through and supplied with voltage during the printing operation, since otherwise the magnetic field of the inductor 33 cannot be maintained.
  • the control electronics are preferably arranged within the forme cylinder 3, as indicated at 8.
  • the required supply and control voltages of the electronics 8 in the forme cylinder 3 and thus the semiconductor layer 6 can be supplied via slip rings or with the aid of a transmitter.
  • the jacket of the forme cylinder 3 can have corresponding openings in order to make the semiconductor layer lying on it accessible for the lines from the inside.
  • the supply and control voltages can also be supplied via the end faces of the forme cylinder 3.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Rotary Presses (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)

Description

Die Erfindung betrifft eine Druckform für eine Druckmaschine mit wiederholt aktivierbaren und löschbaren Bereichen, die nach der Aktivierung farbannehmend sind.The invention relates to a printing form for a printing press with areas which can be activated and deleted repeatedly and which, after activation, are ink-accepting.

Aus der DE-OS 36 33 758 ist es bereits bekannt, auf einer Druckform farbannehmende Bereiche zu erzeugen, indem die aus ferroelektrischem Material bestehende Druckform örtlich polarisiert bzw. dipolarisiert wird. Hierfür bedarf es zusätzlicher Vorrichtungen an der Druckform (beispielsweise in Form eines Druckzylinders), die für die Umsteuervorgänge in den Polarisationsbereichen Elektroden und Wärmequellen aufweisen. Von diesem Stand der Technik ausgehend ist es die Aufgabe der vorliegenden Erfindung eine elektronisch aktivierbare Druckform zu schaffen, die ausschließlich mit elektrischen bzw. elektronischen Schaltelementen betrieben werden kann, an der also von außen keine Hilfsmittel angesetzt werden müssen.From DE-OS 36 33 758 it is already known to produce ink-accepting areas on a printing form by locally polarizing or dipolarizing the printing form consisting of ferroelectric material. This requires additional devices on the printing form (for example in the form of a printing cylinder) which have electrodes and heat sources for the reversal processes in the polarization regions. Starting from this prior art, it is the object of the present invention to provide an electronically activatable printing form which can be operated exclusively with electrical or electronic switching elements, so that no aids need to be attached from the outside.

Diese Aufgabe wird gelöst durch eine auf einem Träger angeordnete Halbleiterschicht, die rasterförmig kapazitive oder induktive Bereiche in Form von Kondensatoren bzw Induktivitäten aufweist, die jeweils durch ein selektiv ansteuerbare elektronische Schaltelemente aufladbar bzw. erregbar sind und die Dichte der Bereiche bei mindestens 160 Schaltelementen pro mm² liegt. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und aus der nachfolgenden Beschreibung in Verbindung mit den Zeichnungen.This object is achieved by a semiconductor layer arranged on a carrier, which has grid-shaped capacitive or inductive areas in the form of capacitors or inductors, each of which can be charged or excited by a selectively controllable electronic switching element and the density of the areas at least 160 switching elements per mm² lies. Further developments of the invention result from the subclaims and from the following description in conjunction with the drawings.

Durch die Erfindung ist es möglich, das in einem Redaktions-Terminal erstellte Druckmotiv direkt auf den elektronisch aktivierbaren Formzylinder zu bringen. Die Herstellung und das Aufspannen einer herkömmlichen Druckplatte ist somit nicht mehr erforderlich. Das zu druckende Motiv kann während des Betriebes vom Redaktions-Terminal aus geändert werden. Nachdem die für die Ansteuerung der Bereiche erforderlichen Mittel vorzugsweise im Inneren des die Druckform tragenden Zylinders angeordnet werden können, ist die erfindungsgemäße Vorrichtung raumsparend und gegen Umwelteinflüsse bestens geschützt. Vorzugsweise besteht die Halbleiterschicht aus einer dünnen siliziumhaltigen Schicht, wie sie aus der Computertechnik bekannt ist, wobei diese Transistor/Kondensator oder Transistor/Induktivitätsmuster durch herkömmliche Diffusionsverfahren eingebracht werden können. Wie aus der Mikro-Elektronik-Technologie allgemein bekannt, ist es möglich, eine Packungsdichte von 600 Bereichen pro mm² und mehr zu erzeugen, so daß die erfindungsgemäße Druckform auch prinzipiell für hohe Qualitätsanforderungen geeignet ist. Für den üblichen Zeitungsdruck genügt jedoch eine Packungsdichte bzw. eine Rasterung von 160 Bereichen in Form von Kondensatoren oder Induktivitäten pro mm².The invention makes it possible to bring the print motif created in an editorial terminal directly onto the electronically activated forme cylinder. The production and clamping of a conventional printing plate is therefore no longer necessary. The motif to be printed can be changed during operation from the editorial terminal. After the for controlling the Areas required means can preferably be arranged inside the cylinder carrying the printing form, the device according to the invention is space-saving and optimally protected against environmental influences. The semiconductor layer preferably consists of a thin silicon-containing layer, as is known from computer technology, it being possible for these transistor / capacitor or transistor / inductance patterns to be introduced by conventional diffusion methods. As is generally known from microelectronics technology, it is possible to produce a packing density of 600 areas per mm 2 and more, so that the printing form according to the invention is also suitable in principle for high quality requirements. For normal newspaper printing, however, a packing density or a grid of 160 areas in the form of capacitors or inductors per mm² is sufficient.

Durch einen Adreßbus können die einzelnen Transistoren von einem Computer (ortsfest oder im Formzylinder) angesteuert werden. Durch einen Datenbus, der Schaltbefehle (ein/aus) übertragen kann und durch einen Versorgungsbus erfolgt die Ansteuerung der Transistoren, die vorzugsweise die elektronischen Schaltelemente in der Halbleiterschicht bilden. Die elementweise aufgebauten elektrostatischen bzw. kapazitiven oder magnetischen Muster dienen dann dazu, geeignete Farbe, wie Ferro-Fluidfarbe oder elektrostatisch aufgeladene Farbe bzw. Toner entsprechend dem zu druckenden Motiv direkt oder über eine auf der Halbleiterschicht angeordnete Schutzschicht anhaften zu lassen. Diese Schutzschicht sollte verschleißfest sein.The individual transistors can be controlled by a computer (stationary or in the forme cylinder) by means of an address bus. The transistors, which preferably form the electronic switching elements in the semiconductor layer, are driven by a data bus which can transmit switching commands (on / off) and by a supply bus. The electrostatic or capacitive or magnetic patterns built up element by element then serve to adhere suitable ink, such as ferro-fluid ink or electrostatically charged ink or toner, directly or via a protective layer arranged on the semiconductor layer, in accordance with the motif to be printed. This protective layer should be wear-resistant.

Im folgenden wird die Erfindung anhand eines Ausführungsbeispieles unter Bezugnahme auf die beiliegenden Zeichnungen detaillierter beschrieben. Diese zeigen schematisch:

Fig. 1
Zylinder einer Rotationsdruckmaschine,
Fig. 2
eine als Druckform geeignete Halbleiterschicht mit Kapazitäts/Transistorbereichen und
Fig. 3
einen Transistor/Induktivitätsbereich.
In the following the invention is described in more detail using an exemplary embodiment with reference to the accompanying drawings. These show schematically:
Fig. 1
Cylinder of a rotary printing press,
Fig. 2
a suitable as printing form semiconductor layer with capacitance / transistor areas and
Fig. 3
a transistor / inductance area.

Vorzugsweise, insbesondere wegen der hohen Arbeitsgeschwindigkeit, wird die erfindungsgemäße Druckform auf einem sogenannten Formzylinder 3 verwendet, der zwischen zwei Seitenwänden 1, 2 eines Druckwerkes drehbar gelagert wird und in üblicher Weise durch Elektromotoren oder durch einen Zahnradantrieb in Drehung versetzbar ist. An den Formzylinder 3 kann ein Gummituchzylinder 4 angestellt werden, wenn nach einem Offsetdruckverfahren gearbeitet werden soll. In diesem Fall wird eine zu bedruckende, hier nicht dargestellte Papierbahn zwischen dem Gummituchzylinder und einem weiteren als Gegendruckzylinder wirkenden Zylinder 5 hindurchgeführt. Im Rahmen der Erfindung ist es jedoch auch möglich im Direktdruckverfahren zu arbeiten. In diesem Fall erübrigt sich der Gummituchzylinder 4, so daß ein Gegendruckzylinder direkt an den die erfindungsgemäße Druckform tragenden Formzylinder 3 anstellbar ist und zwischen beiden die zu bedruckende Papierbahn oder Druckträger in Form von Bogen hindurchführbar sind. Wie aus Fig. 1, rechtes Bild, ersichtlich, trägt der Formzylinder 3 die erfindungsgemäße Druckform 6, die vorzugsweise aus einem dünnen Halbleitermaterial, wie Silizium besteht. An dieser Halbleiterschicht 6 ist der, wie angedeutet, mit einem Gummituch 7 oder einer Gummihülse versehene Zylinder 4 angestellt.Preferably, in particular because of the high working speed, the printing form according to the invention is used on a so-called forme cylinder 3, which is rotatably mounted between two side walls 1, 2 of a printing unit and can be set in rotation in the usual way by electric motors or by a gear drive. A blanket cylinder 4 can be placed on the form cylinder 3 if an offset printing process is to be used. In this case, a paper web to be printed, not shown here, is passed between the blanket cylinder and another cylinder 5 acting as an impression cylinder. In the context of the invention, however, it is also possible to work in the direct printing process. In this case, the blanket cylinder 4 is unnecessary, so that an impression cylinder can be placed directly on the form cylinder 3 carrying the printing form according to the invention and the paper web or printing medium to be printed can be passed between them in the form of sheets. As can be seen from FIG. 1, right picture, the forme cylinder 3 carries the printing form 6 according to the invention, which preferably consists of a thin semiconductor material such as silicon. On this semiconductor layer 6, as indicated, the cylinder 4 is provided with a rubber blanket 7 or a rubber sleeve.

Fig. 2 zeigt die erfindungsgemäß die Druckform bildende Halbleiterschicht 6 zweidimensional, d.h. in Form einer Platte. Es versteht sich, daß die Halbleiterschicht 6 auch rohrförmig ausgebildet sein kann, so daß ein Endlosdruck möglich ist. Die Halbleiterschicht kann auch direkt auf den Formzylinder fest aufgebracht sein.Fig. 2 shows the semiconductor layer 6 forming the printing form according to the invention in two dimensions, i.e. in the form of a plate. It goes without saying that the semiconductor layer 6 can also be tubular, so that continuous printing is possible. The semiconductor layer can also be firmly applied directly to the forme cylinder.

Wie Fig. 2 erkennen läßt, sind die einzelnen Bereiche in Spalten 9, 10, 11 und Zeilen 12, 13, 14 angeordnet. Dadurch ergibt sich eine vorteilhafte Ansteuerung der matrixförmig angeordneten in Fig. 2 dargestellten Kapazitäten 15 mit Hilfe der elektronischen Schaltelemente in Form von Transistoren 16.As can be seen in FIG. 2, the individual areas are arranged in columns 9, 10, 11 and rows 12, 13, 14. This results in an advantageous control of the capacitances 15 arranged in a matrix in FIG. 2 with the aid of the electronic switching elements in the form of transistors 16.

Letztere können in üblicher Weise Feldeffekttransistoren oder sogenannte MOS-Transistoren (Metall-Oxyd-Siliziumtransistoren) sein und weisen jeweils eine Senkenelektrode 17, eine Quellenelektrode 18 und eine Steuerelektrode bzw. Torelektrode 19 auf. Letztere werden üblicherweise als Drainelektrode, Sourceelektrode und Gateelektrode bezeichnet.The latter can be field effect transistors or so-called MOS transistors (metal oxide silicon transistors) in the usual way and each have a sink electrode 17, a source electrode 18 and a control electrode or gate electrode 19. The latter are usually referred to as drain electrodes, source electrodes and gate electrodes.

Jeweils mit einem Transistor 16 kann eine Kapazität 15 in Serie geschaltet werden, so daß beim Durchschalten des Transistors 16 jeweils die zugeordnete Kapazität 15 geladen wird. Durch Anlegen entsprechender Spannungen bzw. Massepotentialen ist eine Entladung der Transistoren in einfacher Weise möglich. Die Transistoren können durch entsprechende Dotierung bzw. Leiterbahnführung in der Halbleiterschicht 6 verwendet werden. Durch entsprechende Auswahl der Treiberleitungen, beispielsweise der Treiberleitung 22 in der Zeile 12 und der Spaltentreiberleitung 27, sowie durch Ansteuerung der zugeordneten Torelektrode über die Leitung 24 kann in Fig. 2 der obere, links dargestellte Bereich in Form einer Kapazität 15 geladen werden. Diese Ladung kann während des Betriebes durch die Beibehaltung bzw. unter Aufrechterhaltung der angelegten Betriebsspannung permanent gehalten werden. Bei ausreichender Isolation ist es auch möglich, nur vor Druckbeginn entsprechend dem zu druckenden Motiv bestimmte Kapazitäten 15 aufzuladen, so daß diese Druckfarbe anziehen können, die bei jeder Umdrehung des Formzylinders 3 an einen Druckträger weitergegeben werden kann. Es ist auch möglich, daß beispielsweise nach jeder zehnten oder hundertsten Umdrehung des Formzylinders 3 eine Nachladung der Kapazitäten erfolgt. In Fig. 2 sind die Kapazitäten 15 als Bereiche angedeutet, d.h. als Bereiche, die, wenn die Kapazitäten aufgeladen sind, in der Lage sind Druckfarbe anzuziehen.In each case with a transistor 16, a capacitance 15 can be connected in series, so that the associated capacitance 15 is loaded when the transistor 16 is switched on. Discharging the transistors is possible in a simple manner by applying corresponding voltages or ground potentials. The transistors can be used in the semiconductor layer 6 by appropriate doping or conductor track routing. By appropriately selecting the driver lines, for example the driver line 22 in the row 12 and the column driver line 27, and by controlling the associated gate electrode via the line 24, the upper region shown on the left in the form of a capacitance 15 can be loaded in FIG. 2. This charge can be kept permanently during operation by maintaining or maintaining the applied operating voltage. With sufficient insulation, it is also possible to charge certain capacities 15 according to the motif to be printed only before the start of printing, so that they can attract printing ink, which can be passed on to a printing medium with each revolution of the forme cylinder 3. It is also possible that, for example, after every tenth or hundredth revolution of the forme cylinder 3, the capacities are recharged. In Fig. 2 the capacitances 15 are indicated as areas, i.e. as areas that are able to attract ink when capacities are charged.

In Fig. 3 ist ein Ausschnitt 34 einer Halbleiterschicht dargestellt, auf der ein Transistor 29 mit Quellenelektroden 31 und Senkenelektrode 30 sowie einer Torelektrode 32 angedeutet ist. In Serie mit der Quellenelektrode und der Senkenelektrode liegt eine Induktivität 33, die mäander- oder zick-zackförmig ausgebildet ist. Durch entsprechende Dotierung der Halbleiterschicht 34 ist dies möglich, so daß quasi eine "eisenlose Induktivität" erzeugt wird. Beim Durchschalten des Transistors 29 fließt durch die Induktivität 33 der über den Transistor 29 steuerbare Strom, so daß ein entsprechendes Magnetfeld entsteht, durch das Farbpartikelchen von beispielsweise einer Ferro-Fluidfarbe angezogen werden können, entsprechend dem zu druckenden Motiv. Es versteht sich, daß bei der Ausführungsform gemäß Fig. 3 während des Druckbetriebes der Transistor 29 permanent aktiviert, d.h. durchgeschaltet und mit Spannung beaufschlagt werden muß, da ansonsten das Magnetfeld der Induktivität 33 nicht aufrechterhalten werden kann.FIG. 3 shows a section 34 of a semiconductor layer on which a transistor 29 with source electrodes 31 and sink electrode 30 and a gate electrode 32 is indicated. In series with the source electrode and the sink electrode is an inductor 33 which is meandering or zigzag-shaped. By appropriate doping of the semiconductor layer 34, this is possible, so that an "ironless inductance" is produced. When the transistor 29 is switched on, the current controllable via the transistor 29 flows through the inductance 33, so that a corresponding magnetic field is created, by means of which color particles of, for example, a ferro-fluid color can be attracted, in accordance with the motif to be printed. It goes without saying that in the embodiment according to FIG. 3 the transistor 29 has to be permanently activated, ie switched through and supplied with voltage during the printing operation, since otherwise the magnetic field of the inductor 33 cannot be maintained.

Vorzugsweise ist die Ansteuerelektronik innerhalb des Formzylinders 3 angeordnet, wie bei 8 angedeutet ist. Über Schleifringe oder auch unter Zuhilfenahme eines Senders können die erforderlichen Versorgungs- und Steuerspannungen der Elektronik 8 im Formzylinder 3 und somit der Halbleiterschicht 6 zugeführt werden. Der Mantel des Formzylinders 3 kann entsprechende Durchbrüche aufweisen, um von innen her die auf ihm liegende Halbleiterschicht für die Leitungen zugänglich zu machen. Alternativ ist auch über die Stirnseiten des Formzylinders 3 eine Zuführung der Versorgungs- und Steuerspannungen möglich.The control electronics are preferably arranged within the forme cylinder 3, as indicated at 8. The required supply and control voltages of the electronics 8 in the forme cylinder 3 and thus the semiconductor layer 6 can be supplied via slip rings or with the aid of a transmitter. The jacket of the forme cylinder 3 can have corresponding openings in order to make the semiconductor layer lying on it accessible for the lines from the inside. Alternatively, the supply and control voltages can also be supplied via the end faces of the forme cylinder 3.

Claims (8)

  1. Printing forme for a printing machine having repeatedly activatable and erasable areas which can be activated in such a way that ink adheres to them, characterised by a semi-conductor layer (6) arranged on a carrier (3) and having capacitive or inductive areas in an array in the form of capacitors (15) or inductances (33) which can be respectively charged or excited by selectively controllable electronic switch elements (16, 29), and the density of the areas (15, 33) is at least 160 switch elements per mm².
  2. Printing forme according to claim 1, characterised in that the areas (15, 33) are arranged in lines (12, 13, 14) and columns (9, 10, 11).
  3. Printing forme according to claim 1 or 2, characterised in that the semi-conductor layer (6) is applied to a rotatable cylinder in which, or on which, control electronics (8) for controlling the switch elements (16, 29) are arranged, and in that the switch elements (16, 29) are transistors which have voltage applied to them by means of row and column drivers (e.g. 20 to 22 and 26 to 28) in such a way that when the control electrode (e.g. 32) is activated the associated storage area (e.g. 33) is respectively charged or excited.
  4. Printing forme according to one of the preceding claims, characterised in that the application of voltage to the switch elements (16, 29) is maintained during the printing process.
  5. Printing forme according to one of the preceding claims, characterised in that the semi-conductor layer (6) is silicon, wherein the switch elements (16, 29), the areas (15, 33) and the control lines (20 to 28) are produced by doping of the semi-conductor layer (6).
  6. Printing forme according to one of the preceding claims, characterised in that a wear-resistant layer is arranged over the semi-conductor layer (6).
  7. Printing forme according to one of the preceding claims, characterised in that the areas (15, 33) are computer-controlled.
  8. Printing forme according to one of the preceding claims, characterised in that a ferro-fluid ink or an electrostatically charged ink or toner is used as the printing ink.
EP89119545A 1988-10-29 1989-10-21 Printing form with parts that can be repeatedly activated and removed Expired - Lifetime EP0367048B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836931 1988-10-29
DE3836931A DE3836931C2 (en) 1988-10-29 1988-10-29 PRINT FORM FOR A PRINTING MACHINE WITH REPEATABLE ACTIVATIBLE AND DELETABLE AREAS

Publications (3)

Publication Number Publication Date
EP0367048A2 EP0367048A2 (en) 1990-05-09
EP0367048A3 EP0367048A3 (en) 1992-04-15
EP0367048B1 true EP0367048B1 (en) 1995-08-23

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EP89119545A Expired - Lifetime EP0367048B1 (en) 1988-10-29 1989-10-21 Printing form with parts that can be repeatedly activated and removed

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US (1) US5109240A (en)
EP (1) EP0367048B1 (en)
JP (1) JPH02196694A (en)
DE (2) DE3836931C2 (en)

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GB2245866B (en) * 1990-07-07 1995-03-15 Heidelberger Druckmasch Ag Printing machine with print image formation system
DE4205304A1 (en) * 1992-02-21 1993-08-26 Heidelberger Druckmasch Ag CIRCUIT ARRANGEMENT FOR A REVERSIBLE IMAGE STRUCTURE OF A PRINTING FORM OF A PRINTING MACHINE
DE19508254C5 (en) * 1994-04-15 2014-02-13 Eastman Kodak Co. Method for transporting individual sheets
DE4413238B4 (en) * 1994-04-15 2008-05-15 Anton Rodi Method for feeding and discharging sheets to be printed / printed to / from at least one printing unit of a sheet-fed printing machine
DE4428865A1 (en) * 1994-08-05 1995-01-12 Michael Schandelmaier Printing method without printing formes
US5927206A (en) * 1997-12-22 1999-07-27 Eastman Kodak Company Ferroelectric imaging member and methods of use
DE19945847A1 (en) * 1998-10-10 2000-06-21 Heidelberger Druckmasch Ag Changing the wetting characteristics of a printing mold used in offset printing comprises putting the surface of a semiconductor in one chemical state, and putting parts of all regions of the semiconductor surface in a second chemical state
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EP0367048A3 (en) 1992-04-15
DE3836931C2 (en) 1993-11-04
DE3836931A1 (en) 1990-05-03
US5109240A (en) 1992-04-28
JPH02196694A (en) 1990-08-03
EP0367048A2 (en) 1990-05-09
DE58909395D1 (en) 1995-09-28

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