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EP1839097A1 - Device for electrographic printing or copying using liquid colouring agents - Google Patents

Device for electrographic printing or copying using liquid colouring agents

Info

Publication number
EP1839097A1
EP1839097A1 EP05850172A EP05850172A EP1839097A1 EP 1839097 A1 EP1839097 A1 EP 1839097A1 EP 05850172 A EP05850172 A EP 05850172A EP 05850172 A EP05850172 A EP 05850172A EP 1839097 A1 EP1839097 A1 EP 1839097A1
Authority
EP
European Patent Office
Prior art keywords
image carrier
latent image
colorant
liquid
feed
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
EP05850172A
Other languages
German (de)
French (fr)
Other versions
EP1839097B1 (en
Inventor
Hans Mathea
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1839097A1 publication Critical patent/EP1839097A1/en
Application granted granted Critical
Publication of EP1839097B1 publication Critical patent/EP1839097B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0813—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by means in the developing zone having an interaction with the image carrying member, e.g. distance holders
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/11—Removing excess liquid developer, e.g. by heat
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/06—Developing structures, details
    • G03G2215/0634—Developing device

Definitions

  • the invention relates to a device according to the preamble of claim 1, for electrographic printing or copying using liquid colorants, with a latent image carrier and at least one feed element designed as a slot-shaped feed nozzle, by means of which the liquid colorant can be applied to the latent image carrier, as well as out as a suction device - formed decrease element, by means of which excess parts of the liquid colorant are removable from the latent image carrier.
  • Such a device is known for example from GB 2 243 227 A.
  • liquid toner is applied to a latent image carrier formed as an image roller.
  • the device has a slot-shaped outlet through which liquid toner is applied to the image roller by means of a pump.
  • a slot-shaped inlet is arranged, which is acted upon by a negative pressure.
  • toner which does not adhere to the image roller, sucked from the image roller.
  • an electrode is arranged, which has a small distance from the surface of the image roller.
  • Outlet arranged an overflow passage, however, passes into this only toner, which is located on the side facing away from the electrode of the outlet.
  • Toner which adheres to the image roller, can not be picked up by the passage.
  • a device in which the image carrier is wetted with a liquid developer or colorant from a dispersant or a carrier liquid and toner particles for developing a charge image which is applied to an electrically coated image carrier.
  • the image carrier is wetted with a liquid developer or colorant from a dispersant or a carrier liquid and toner particles for developing a charge image which is applied to an electrically coated image carrier.
  • part of the toner on the surface of the image carrier is bound imagewise.
  • the remaining toner is removed so that no background tint is created.
  • so much dispersant is removed from the image carrier that remains on the image carrier only so much dispersant that the further treatment of the developed charge image is done properly and quickly.
  • a separating member is provided, which is moved relative to the image carrier and whose surface is just immersed in the liquid developer applied to the image carrier, so that a portion of the dispersant contained in the liquid developer is removed, for example by adhesion.
  • an electric field is applied between the separator and the image carrier, the field direction of which depends on the charge of the toner contained in the liquid developer. By this electric field of non-imagewise bound toner is attracted to the separator.
  • the liquid developer is applied to the image carrier by means of a separate element spatially separated from the collecting organ. Since the element must also be arranged at an exact distance from the image carrier, it is thus necessary to set the distance of the element from the image carrier as well as the distance of the separating member from the image carrier separated from each other, wherein in particular the distance of the Abscheideorgans of the Image carrier must be set very accurately. Because of this distance it depends on whether unneeded toner or excess dispersant is removed with the required thoroughness from the image carrier.
  • the device also has a cleaning station, which serves to clean the latent image carrier after the Umbuchen the colorant image of the remaining colorants and restore a defined initial state.
  • the cleaning station may include a suction device which sucks the liquid residual dye from the surface of the image carrier.
  • the extracted exhaust air can be filtered and the liquid colorant are deposited, which is preferably used again in the further printing process.
  • Image drum are arranged four developer units, by means of which, respectively
  • Liquid toner in different colors is applied to the image drum.
  • Toner is transferred by means of transfer rollers, which on the one hand into a reservoir in which
  • Liquid toner is located, immersed, and on the other hand on the surface of
  • a plotter toner station for an electrostatic printer which has a write head and a developer unit which can be fastened to the write head.
  • a charge is applied to a typically made of paper final image carrier, which passes the write head.
  • the final image carrier passes through the developer unit.
  • the developer unit has a roller, by means of which toner is applied to the final image carrier.
  • the roller is previously sprayed by means of a spray unit with liquid toner.
  • the final image carrier passes through a vacuum chamber, by means of which excess toner is removed from the final image carrier.
  • the vacuum chamber has openings through which toner, which is located at not provided with charge points of Endman versas is sucked from the final image carrier.
  • an apparatus for electrographic printing or copying using liquid colorants which regularly consist of a carrier liquid and toner particles, with a latent image carrier and at least one feed element designed as a slot-shaped feed nozzle, by means of which the liquid colorant can be applied to the latent image carrier, and a designed as a suction element acceptance element, by means of the über- schüssige parts of the liquid colorant can be removed from the latent image carrier, characterized in that a decoupling channel is arranged between the acceptance element and the feed element.
  • the feed element is designed as a slot-shaped feed nozzle, and that below the feed element, a return channel is arranged, it is possible to apply the liquid colorant by means of a surge on the latent image carrier.
  • the removal element is designed as a suction device, excess parts, in particular of the dispersant, can be removed in a simple manner and very reliably from the latent image carrier. Since the removal of the liquid colorant from the latent image carrier depends on the negative pressure of the suction device, it can be achieved by controlling the negative pressure in a very simple manner that almost all excess parts of the liquid colorant are removed from the latent image carrier without the parts forming the colorant image be removed from the latent image carrier. This has a very beneficial effect on the quality of the prints or copies produced by the device.
  • a decoupling channel is arranged between the acceptance element and the feed element. This ensures that the suction device has no effect on the feed. The sucked by the suction device optionally from the direction of the feed element air is completely provided by the decoupling channel, so that no suction is exerted on the feed element.
  • a scraper is arranged in the direction of movement of the latent image carrier behind the feed nozzle, which is arranged at a first predetermined distance from the latent image carrier.
  • the scraper is not to completely remove the excess portions of the colorant from the latent image carrier, it may be located at a relatively large distance of about one to two tenths of a millimeter from the latent image carrier. This avoids that contaminants present in the liquid colorant, such as, for example, cometary particles, get stuck in the gap between the wiper and the latent image carrier, which could damage the latent image carrier.
  • An embodiment of the invention in which a return flow channel is arranged in front of the wiper in the direction of movement of the latent image carrier is also very advantageous, such that liquid colorant retained by the wiper passes into the return flow channel.
  • that part of the surge that does not adhere to the latent image carrier may enter the return channel, which is advantageously connected to the liquid colorant reservoir.
  • the reflux channel can be formed or arranged so that the developer unit can be arranged laterally by a latent image carrier designed as an image roller. This has a very advantageous effect on the height of the device, which is very noticeable especially in color printers or color copiers.
  • the suction device has a nozzle opening which is designed such that at least twice, in particular at least eight times, preferably at least ten times as much air can be sucked in from the direction away from the feed element than by means of the latter Feed element facing direction.
  • the suction By the suction, the particles can atomize, whereby the colorant image adhering to the latent image carrier is slightly dried.
  • the degree of drying of the colorant image adhering to the latent image carrier can be adjusted. This is very advantageous because in some applications it is required that the colorant image adhering to the latent image carrier is not completely dry.
  • the distance of the pickup element is also fixed by the feed element. This requires the The distance of the pickup element from the feed element, in particular after a removal of the developer unit from the latent image carrier, can not be readjusted, as a result of which the products produced by means of the device are of consistent quality.
  • elements which are composed of a conductive material and are arranged at a fourth predetermined distance from the latent image carrier are arranged between the feed element and the take-off element.
  • the elements made of a conductive material it can be achieved in an advantageous manner that there is an electric field existing between the developer unit 2o and the latent image carrier over a relatively long distance. As a result, there is a very good development of the colorant image on the latent image carrier.
  • the respective elements can be formed from a conductive material.
  • the developer unit is made entirely of a conductive material.
  • the device according to the invention can be designed so that it can be arranged laterally on a designed as an image roller latent image carrier.
  • a plurality of developer units can be arranged one above the other at a low overall height, which is very advantageous in particular with 30 color printers or color copiers.
  • the puffing of the image roller the development of the latent image and the removal of the excess Sigen parts of the liquid colorant from the latent image carrier no moving parts are present.
  • the suction of the excess parts of the liquid colorant from the latent image carrier can be dispensed with, to use a rotating with the image roller deposition roller.
  • the deposition roller must be arranged at great expense on the image roller, so that it does not come into contact with the surface of the image roller even in the case of a non-circular image roller or in the case of a non-circular motion of the image roller.
  • the single figure shows a schematic arrangement of an i5 device according to the invention from the side in section.
  • a developer unit 2 is arranged on a latent image carrier 1 designed as image roller 1.
  • the image roller 1 rotates in the direction of the arrow 1 '.
  • the developer unit 2 is made of metal such as aluminum, for example, and is connected to a power source, not shown in the figure, so as to have a potential of several hundred volts (about four hundred to seven hundred volts) from the image drum 1.
  • the developer unit 2 has a feed element 3a designed as a slot-shaped feed nozzle.
  • the feed nozzle 3a is formed by an upper wall 8 of the developer unit 2 and a displaceable in the direction of the image roller 1 plate 5a.
  • the amount of colorant passed through the supply nozzle 3a onto the surface of the image drum 1, which consists of a carrier liquid and toner particles can be adjusted.
  • the amount of colorant is larger or smaller.
  • the distance of the plate 5 a from the image roller. 1 is adjusted so that the present on the image drum 1 latent image is colored to a saturated colorant image.
  • a return channel 6a is arranged below the plate 5a, which does not catch on the image roller 1 adhering colorant.
  • the reflux channel 6 is connected to the reservoir of the colorant, so that the collected from the return channel 6 colorant can be reused and re-image roller 1 can be supplied.
  • the wall 7a of the return flow channel 6a facing the image roller 1 is designed so that it runs in the direction of rotation 1 'of the image roller 1 over a range of a few centimeters at a distance of approximately 0.2 millimeters from the surface of the image roller 1. In this way, it forms a scraper 7a, which limits the thickness of the colorant adhering to the image roller 1 to about 0.2 millimeters i5. The excess portion of the colorant is retained by the scraper 7a and enters the return channel 6a.
  • a second feed nozzle 3b is arranged, which is formed by the wall of the return channel 6a and a second plate 5b 2o.
  • the second plate 5b is also displaceable in the direction of the image roller 1.
  • a second return channel 6b is arranged, whose wall facing the image roller 1 forms a second scraper 7b, which likewise limits the thickness of the colorant adhering to the image roller 1 to approximately 0.2 millimeters.
  • a second feed nozzle 3b and a second return channel 6b can achieve that a saturated colorant image can be applied to the latent image carrier in each case. If this is already achieved by means of the first feed nozzle 3a, it is of course possible to dispense with the second feed nozzle 3b and the second return flow channel 6b.
  • Disposed on the lower side of the developer unit 2 is a channel 4 which can be subjected to a negative pressure and which has an outlet opening 4a, by means of which excess colorant can be sucked out of the image roller 1.
  • the negative pressure is adjustable, so that such a negative pressure can be adjusted that almost all excess parts of the liquid colorant are removed from the image drum 1, but stick the parts forming the colorant image on the image roller 1.
  • the outlet opening 4a of the channel 4 is formed so that the sucked from the channel 4 air for the vast majority of the feed nozzle 3a side facing away from the channel 4 passes. That is, the air sucked into the passage 4 passes through a gap formed by the lower wall of the developer unit 2 and the surface of the image drum 1. As a result, an atomization of still adhering to the image roller 1 carrier liquid takes place.
  • a decoupling channel 9 is arranged below the second return channel 6b. Both ends of the decoupling channel 9 are open, so that ambient air can freely penetrate into the decoupling channel 9.
  • the developer unit 2 is arranged in a guide, not shown in the figure, so that it can be removed in a simple manner from the image roller 1 or arranged on the image drum 1. For this purpose, the developer unit 2 is moved in the direction of the arrow 2 '.
  • a stopper 2a is provided, against which a protruding element 2b of the developer unit 2 abuts.
  • the developer unit 2 can be easily arranged with the highest accuracy on the image drum 1.
  • the developer unit 2 can be arranged laterally on the image drum 1. As a result, a small overall height of the device is achieved, whereby a plurality of devices can be arranged one above the other at a low overall height, as may be the case for example with color printers or color copiers.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Cleaning In Electrography (AREA)
  • Color Electrophotography (AREA)
  • Liquid Developers In Electrophotography (AREA)

Abstract

In an apparatus for the electrographic printing or copying using liquid coloring agents consisting of a carrier liquid and toner particles, including a latent image carrier and at least one supply element in the form of a slot-like supply nozzle via which the liquid toner is applied to the latent image carrier and a suction element by which excess liquid coloring agent is removed from the latent image carrier, a de-coupling channel is arranged between the suction element and the supply element.

Description

Vorrichtung zum elektrographischen Drucken oder Kopieren unter Verwendung flüssiger Farbmittel Apparatus for electrographic printing or copying using liquid colorants
Die Erfindung betrifft eine Vorrichtung nach dem Oberbegriff des Anspruchs 1, zum elektrographischen Drucken oder Kopieren unter Verwendung flüssiger Farbmittel, mit einem Latentbildträger und wenigstens einem als schlitzförmige Zuführdüse ausgebildeten Zuführelement, mittels dem das flüssige Farbmittel auf den Latentbildträger aufbringbar ist, sowie einem als Absaugvorrichtung ausge- bildeten Abnahmeelement, mittels dem überschüssige Teile des flüssigen Farbmittels von dem Latentbildträger entfernbar sind.The invention relates to a device according to the preamble of claim 1, for electrographic printing or copying using liquid colorants, with a latent image carrier and at least one feed element designed as a slot-shaped feed nozzle, by means of which the liquid colorant can be applied to the latent image carrier, as well as out as a suction device - formed decrease element, by means of which excess parts of the liquid colorant are removable from the latent image carrier.
Eine derartige Vorrichtung ist beispielsweise aus der GB 2 243 227 A bekannt. Bei der bekannten Vorrichtung wird Flüssigtoner auf einen als Bildwalze ausgebildeten Latentbildträger aufgebracht. Hierzu weist die Vorrichtung einen schlitzförmigen Auslaß auf, durch den Flüssigtoner mittels einer Pumpe auf die Bildwalze aufgebracht wird. In Bewegungsrichtung der Bildwalze hinter dem schlitzförmigen Auslaß ist ein schlitzförmiger Einlaß angeordnet, welcher mit einem Unterdruck beaufschlagt ist. Hierdurch wird Toner, welcher nicht an der Bildwalze haftet, von der Bildwalze abgesaugt. Zwischen dem Auslaß und dem Einlaß ist eine Elektrode angeordnet, welche einen geringen Abstand zur Oberfläche der Bildwalze aufweist.Such a device is known for example from GB 2 243 227 A. In the known device, liquid toner is applied to a latent image carrier formed as an image roller. For this purpose, the device has a slot-shaped outlet through which liquid toner is applied to the image roller by means of a pump. In the direction of movement of the image roller behind the slit-shaped outlet, a slot-shaped inlet is arranged, which is acted upon by a negative pressure. As a result, toner, which does not adhere to the image roller, sucked from the image roller. Between the outlet and the inlet, an electrode is arranged, which has a small distance from the surface of the image roller.
Da sich der Einlaß in Bewegungsrichtung der Bildwalze hinter der Elektrode befindet, kann von ihm Toner, welcher durch die Elektrode gestaut wird, nicht aufgenommen werden. Zwar ist in Bewegungsrichtung der Bildwalze vor demSince the inlet is located behind the electrode in the direction of movement of the image roller, toner which is jammed by the electrode can not be picked up by it. Although in the direction of movement of the image roller before the
Auslaß ein Überfluss-Durchgang angeordnet, jedoch gelangt in diesen nur Toner, welcher sich auf der der Elektrode abgewandten Seite des Auslasses befindet.Outlet arranged an overflow passage, however, passes into this only toner, which is located on the side facing away from the electrode of the outlet.
Toner, welcher an der Bildwalze haftet, kann von dem Durchgang nicht aufge- nommen werden. Aus der DE 32 30 862 A1 ist eine Vorrichtung bekannt, bei der zur Entwicklung eines Ladungsbildes, das auf einem elektrisch beschichteten Bildträger aufgebracht ist, der Bildträger mit einem Flüssigentwickler beziehungsweise Farbmittel aus einem Dispersant beziehungsweise einer Trägerflüssigkeit und Tonerteilchen benetzt wird. Durch das Ladungsbild wird ein Teil des Toners auf der Oberfläche des Bildträgers bildmäßig gebunden. Der übrige Toner wird entfernt, damit keine Hintergrundtönung entsteht. Des weiteren wird soviel Dispersant von dem Bildträger entfernt, daß auf dem Bildträger nur noch soviel Dispersant verbleibt, daß die Weiterbehandlung des entwickelten Ladungsbildes einwandfrei und schnell erfolgt. Hierzu ist ein Abscheideorgan vorgesehen, das relativ zum Bildträger bewegt wird und dessen Oberfläche gerade noch in den auf den Bildträger aufgetragenen Flüssigentwickler eintaucht, so daß ein Teil des im Flüssigentwickler enthaltenen Dispersants beispielsweise durch Adhäsion abgezogen wird. Außerdem ist zwischen dem Abscheideorgan und dem Bildträger ein elektrisches Feld angelegt, dessen Feldrichtung von der Ladung des im Flüssigentwickler enthaltenen Toners abhängt. Durch dieses elektrische Feld wird der nicht bildmäßig gebundene Toner vom Abscheideorgan angezogen.Toner, which adheres to the image roller, can not be picked up by the passage. From DE 32 30 862 A1 a device is known in which the image carrier is wetted with a liquid developer or colorant from a dispersant or a carrier liquid and toner particles for developing a charge image which is applied to an electrically coated image carrier. Through the charge image, part of the toner on the surface of the image carrier is bound imagewise. The remaining toner is removed so that no background tint is created. Furthermore, so much dispersant is removed from the image carrier that remains on the image carrier only so much dispersant that the further treatment of the developed charge image is done properly and quickly. For this purpose, a separating member is provided, which is moved relative to the image carrier and whose surface is just immersed in the liquid developer applied to the image carrier, so that a portion of the dispersant contained in the liquid developer is removed, for example by adhesion. In addition, an electric field is applied between the separator and the image carrier, the field direction of which depends on the charge of the toner contained in the liquid developer. By this electric field of non-imagewise bound toner is attracted to the separator.
Bei der bekannten Vorrichtung wird der Flüssigentwickler mittels eines von dem Ab-scheideorgan räumlich getrennten separaten Elements auf den Bildträger aufgebracht. Da auch das Element in einem genauen Abstand von dem Bildträger ange-ordnet sein muß, ist es somit erforderlich, den Abstand des Elements von dem Bildträger wie auch den Abstand des Abscheideorgans von dem Bildträger getrennt voneinander einzustellen, wobei insbesondere der Abstand des Abscheideorgans von dem Bildträger sehr genau eingestellt werden muß. Denn von diesem Abstand hängt es ab, ob nicht benötigter Toner beziehungsweise überschüssiger Dispersant mit der erforderlichen Gründlichkeit vom Bildträger entfernt wird.In the known device, the liquid developer is applied to the image carrier by means of a separate element spatially separated from the collecting organ. Since the element must also be arranged at an exact distance from the image carrier, it is thus necessary to set the distance of the element from the image carrier as well as the distance of the separating member from the image carrier separated from each other, wherein in particular the distance of the Abscheideorgans of the Image carrier must be set very accurately. Because of this distance it depends on whether unneeded toner or excess dispersant is removed with the required thoroughness from the image carrier.
Des weiteren ist aus der DE 100 27 173 A1 eine Einrichtung und ein Verfahren zum elektrographischen Drucken oder Kopieren unter Verwendung flüssiger Farbmittel, welche regelmäßig aus einer Trägerflüssigkeit und Tonerpartikel bestehen, bekannt, bei welchem ein Applikatorelement vorhanden ist, das eine Schicht eines Farbmittels trägt. Zwischen der Flüssigkeitsschicht und der ihr gegenüberstehenden Oberfläche des Latentbildträgers ist ein Luftspalt vorhanden. 5 Zum Einfärben des latenten Bildes auf dem Latentbildträger werden Tröpfchen von der Flüssigkeitsschicht auf die Oberfläche des Latentbildträgers unter Überwindung des Luftspalts übertragen. Hierdurch wird das Latentbild zu einem Farbmittelbild eingefärbt. Dieses Farbmittelbild kann direkt auf einen beispielsweise aus Papier bestehenden Endbildträger übertragen werden.Furthermore, from DE 100 27 173 A1 a device and a method for electrographic printing or copying using liquid Colorants, which regularly consist of a carrier liquid and toner particles, known, in which an applicator element is present, which carries a layer of a colorant. There is an air gap between the liquid layer and the surface of the latent image carrier facing it. 5 To color the latent image on the latent image carrier, droplets are transferred from the liquid layer to the surface of the latent image carrier, overcoming the air gap. As a result, the latent image is colored to a colorant image. This colorant image can be transferred directly to an existing example of paper Endbildträger.
1010
Die Einrichtung weist auch eine Reinigungsstation auf, die dazu dient, den Latentbildträger nach dem Umdrucken des Farbmittelbildes von den restlichen Farbmitteln zu reinigen und einen definierten Anfangszustand wieder herzustellen. Die Reinigungsstation kann eine Absaugeinrichtung enthalten, die den flüssigen i5 Farbmittelrest von der Oberfläche des Bildträgers absaugt. Die abgesaugte Abluft kann gefiltert und das flüssige Farbmittel abgeschieden werden, welches vorzugsweise beim weiteren Druckprozeß wieder verwendet wird.The device also has a cleaning station, which serves to clean the latent image carrier after the Umdrucken the colorant image of the remaining colorants and restore a defined initial state. The cleaning station may include a suction device which sucks the liquid residual dye from the surface of the image carrier. The extracted exhaust air can be filtered and the liquid colorant are deposited, which is preferably used again in the further printing process.
Darüber hinaus ist aus der US 6,385,421 B1 eine Druckvorrichtung bekannt,Moreover, from US 6,385,421 B1 a printing device is known,
20 welche einen als Bildwalze ausgebildeten Latentbildträger aufweist. An der20 which has a formed as an image roller latent image carrier. At the
Bildwalze sind vier Entwicklereinheiten angeordnet, mittels welcher jeweilsImage drum are arranged four developer units, by means of which, respectively
Flüssigtoner in unterschiedlichen Farben auf die Bildwalze aufgebracht wird. DerLiquid toner in different colors is applied to the image drum. Of the
Toner wird mittels Transferwalzen, welche einerseits in ein Reservoir, in dem sichToner is transferred by means of transfer rollers, which on the one hand into a reservoir in which
Flüssigtoner befindet, eintauchen, und andererseits auf der Oberfläche desLiquid toner is located, immersed, and on the other hand on the surface of
25 Latentbildträgers aufliegen, aufgebracht.25 Latent Bildträgers rest, applied.
In Bewegungsrichtung der Bildwalze ist hinter den Transferwalzen jeweils eine Vakuumdüse angeordnet, mittels welcher überflüssiger Flüssigtoner von dem Latentbildträger entfernt wird. Durch die Verwendung von Walzen zur Übertragung 3o des Flüssigtoners auf den Latentbildträger lassen sich keine hohen Druckgeschwindigkeiten erreichen. Weiterhin ist aus der EP O 223 693 A2 eine Plotter-Toner-Station für einen elektrostatischen Drucker bekannt, welche einen Schreibkopf und eine an den Schreibkopf befestigbare Entwicklereinheit aufweist. Mittels des Schreibkopfes wird eine Ladung auf einen typischerweise aus Papier bestehenden Endbildträger, der der den Schreibkopf passiert, aufgebracht. Im Anschluss an den Schreibkopf passiert der Endbildträger die Entwicklereinheit. Die Entwicklereinheit weist eine Walze auf, mittels welcher Toner auf den Endbildträger aufgebracht wird. Hierzu wird die Walze zuvor mittels einer Sprüheinheit mit flüssigem Toner besprüht.In the direction of movement of the image roller behind the transfer rollers each have a vacuum nozzle is arranged, by means of which excess liquid toner is removed from the latent image carrier. By using rollers for transfer 3o of the liquid toner onto the latent image carrier, high printing speeds can not be achieved. Furthermore, from EP 0 223 693 A2 a plotter toner station for an electrostatic printer is known, which has a write head and a developer unit which can be fastened to the write head. By means of the write head, a charge is applied to a typically made of paper final image carrier, which passes the write head. Following the write head, the final image carrier passes through the developer unit. The developer unit has a roller, by means of which toner is applied to the final image carrier. For this purpose, the roller is previously sprayed by means of a spray unit with liquid toner.
Nachdem Toner auf den Endbildträger aufgebracht wurde, passiert der Endbildträger eine Vakuumkammer, mittels welcher überflüssiger Toner von dem Endbildträger entfernt wird. Hierzu weist die Vakuumkammer Öffnungen auf, durch welcher Toner, welcher sich an nicht mit Ladung versehenen Stellen des Endbildträgers befindet, vom Endbildträger abgesaugt wird.After toner has been applied to the final image carrier, the final image carrier passes through a vacuum chamber, by means of which excess toner is removed from the final image carrier. For this purpose, the vacuum chamber has openings through which toner, which is located at not provided with charge points of Endbildträgers is sucked from the final image carrier.
Durch die Übertragung des Toners mittels einer Walze auf den Bildträger ist eine hohe Druckgeschwindigkeit nicht möglich.By transferring the toner by means of a roller on the image carrier, a high printing speed is not possible.
Es ist Aufgabe der Erfindung, eine eingangs genannte Vorrichtung derart auszu- bilden, daß sie bei Erreichung einer hohen Druckgeschwindigkeit eine geringe Bauhöhe hat.It is an object of the invention to form an aforementioned device such that it has a low height when reaching a high printing speed.
Die Lösung dieser Aufgabe ergibt sich aus den Merkmalen des kennzeichnenden Teils des Anspruchs 1. Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.The solution of this problem arises from the features of the characterizing part of claim 1. Advantageous developments of the invention will become apparent from the dependent claims.
Gemäß der Erfindung ist eine Vorrichtung zum elektrographischen Drucken oder Kopieren unter Verwendung flüssiger Farbmittel, welche regelmäßig aus einer Trägerflüssigkeit und Tonerteilchen bestehen, mit einem Latentbildträger und wenigstens einem als schlitzförmige Zuführdüse ausgebildeten Zuführelement, mittels dem das flüssige Farbmittel auf den Latentbildträger aufbringbar ist, sowie einem als Absaugelement ausgebildeten Abnahmeelement, mittels dem über- schüssige Teile des flüssigen Farbmittels von dem Latentbildträger entfernbar sind, dadurch gekennzeichnet, dass zwischen dem Abnahmeelement und dem Zuführelement ein Entkopplungskanal angeordnet ist.According to the invention, an apparatus for electrographic printing or copying using liquid colorants, which regularly consist of a carrier liquid and toner particles, with a latent image carrier and at least one feed element designed as a slot-shaped feed nozzle, by means of which the liquid colorant can be applied to the latent image carrier, and a designed as a suction element acceptance element, by means of the über- schüssige parts of the liquid colorant can be removed from the latent image carrier, characterized in that a decoupling channel is arranged between the acceptance element and the feed element.
Dadurch, dass das Zuführelement als schlitzförmige Zuführdüse ausgebildet ist, sowie daß unterhalb des Zuführelements ein Rückflußkanal angeordnet ist, ist es möglich, das flüssige Farbmittel mittels eines Schwalls auf den Latentbildträger aufzubringen.Characterized in that the feed element is designed as a slot-shaped feed nozzle, and that below the feed element, a return channel is arranged, it is possible to apply the liquid colorant by means of a surge on the latent image carrier.
Dadurch, dass das Abnahmeelement als Absaugvorrichtung ausgebildet ist, lassen sich überschüssige Teile insbesondere des Dispersanten auf einfache Weise und sehr zuverlässig von dem Latentbildträger entfernen. Da die Entfernung des flüssigen Farbmittels von dem Latentbildträger von dem Unterdruck der Absaugvorrichtung abhängt, läßt sich über eine Steuerung des Unterdrucks auf sehr einfache Weise erreichen, daß nahezu alle überschüssigen Teile des flüssigen Farbmittels von dem Latentbildträger entfernt werden, ohne daß die das Farbmittelbild bildenden Teile vom Latentbildträger entfernt werden. Dies wirkt sich sehr vorteilhaft auf die Qualität der mittels der Vorrichtung erzeugten Drucke oder Kopien aus.Because the removal element is designed as a suction device, excess parts, in particular of the dispersant, can be removed in a simple manner and very reliably from the latent image carrier. Since the removal of the liquid colorant from the latent image carrier depends on the negative pressure of the suction device, it can be achieved by controlling the negative pressure in a very simple manner that almost all excess parts of the liquid colorant are removed from the latent image carrier without the parts forming the colorant image be removed from the latent image carrier. This has a very beneficial effect on the quality of the prints or copies produced by the device.
Sehr vorteilhaft ist es, daß zwischen dem Abnahmeelement und dem Zuführelement ein Entkopplungskanal angeordnet ist. Hierdurch wird sichergestellt, daß die Absaugvorrichtung keine Auswirkungen auf das Zuführelement hat. Die von der Absaugvorrichtung gegebenenfalls aus Richtung des Zuführelements angesaugte Luft wird vollständig durch den Entkopplungskanal zur Verfügung gestellt, so daß auf das Zuführelement kein Sog ausgeübt wird.It is very advantageous that a decoupling channel is arranged between the acceptance element and the feed element. This ensures that the suction device has no effect on the feed. The sucked by the suction device optionally from the direction of the feed element air is completely provided by the decoupling channel, so that no suction is exerted on the feed element.
Bei einer besonderen Ausführungsform der Erfindung ist in Bewegungsrichtung des Latentbildträgers hinter der Zuführdüse ein Abstreifer angeordnet, welcher in einem ersten vorbestimmten Abstand von dem Latentbildträger angeordnet ist. Hierdurch läßt sich die Menge der an dem Latentbildträger haftenden überschüssigen Teile des flüssigen Farbmittels begrenzen. Da der Abstreifer jedoch nicht zum vollständigen Entfernen der überschüssigen Teile des Farbmittels von dem Latentbildträger dient, kann er in einem relativ großen Abstand von etwa ein bis zwei Zehntel Millimeter von dem Latentbildträger entfernt angeordnet sein. Hierdurch wird vermieden, daß im flüssigen Farbmittel vorhandene Verunreinigun- gen wie beispielsweise komförmige Partikel in dem Spalt zwischen dem Abstreifer und dem Latentbildträger stecken bleiben, wodurch der Latentbildträger beschädigt werden könnte. Des weiteren wirken sich Unrundheiten beziehungsweise ein unrunder Lauf der Bildwalze wegen des relativ großen Abstands der Oberfläche der Bildwalze von dem Abstreifer nicht aus. Es kann daher auf Sicherheitsmaß- nahmen, durch die vermieden wird, daß der Abstreifer auch bei einer unrunden Bildwalze beziehungsweise bei einem unrunden Lauf der Bildwalze nicht mit der Oberfläche der Bildwalze in Berührung kommt, verzichtet werden.In a particular embodiment of the invention, a scraper is arranged in the direction of movement of the latent image carrier behind the feed nozzle, which is arranged at a first predetermined distance from the latent image carrier. As a result, the amount of adhering to the latent image carrier surplus parts of the liquid colorant can be limited. However, the scraper is not to completely remove the excess portions of the colorant from the latent image carrier, it may be located at a relatively large distance of about one to two tenths of a millimeter from the latent image carrier. This avoids that contaminants present in the liquid colorant, such as, for example, cometary particles, get stuck in the gap between the wiper and the latent image carrier, which could damage the latent image carrier. Furthermore, out of roundness or a non-circular running of the image roller because of the relatively large distance of the surface of the image roller from the scraper does not affect. Therefore, it is possible to dispense with safety measures which prevent the wiper from coming into contact with the surface of the image roller even in the case of a non-circular image roller or in the case of a non-circular motion of the image roller.
Sehr vorteilhaft ist auch eine Ausführungsform der Erfindung, bei der in Bewegungsrichtung des Latentbildträgers vor dem Abstreifer ein Rückflusskanal angeordnet ist, derart, dass vom Abstreifer zurückgehaltenes flüssiges Farbmittel in den Rückflusskanal gelangt. Somit kann der Teil des Schwalls, der nicht an dem Latentbildträger haften bleibt, in den Rückflußkanal, welcher in vorteilhafterweise mit dem Reservoir des flüssigen Farbmittels verbunden ist, gelangen.An embodiment of the invention in which a return flow channel is arranged in front of the wiper in the direction of movement of the latent image carrier is also very advantageous, such that liquid colorant retained by the wiper passes into the return flow channel. Thus, that part of the surge that does not adhere to the latent image carrier may enter the return channel, which is advantageously connected to the liquid colorant reservoir.
Der Rückflußkanal lässt sich so ausbilden beziehungsweise anordnen, daß die Entwicklereinheit seitlich von einem als Bildwalze ausgebildeten Latentbildträger angeordnet werden kann. Dies wirkt sich sehr vorteilhaft auf die Bauhöhe der Vorrichtung aus, was sich insbesondere bei Farbdruckern oder Farbkopierern sehr deutlich bemerkbar macht.The reflux channel can be formed or arranged so that the developer unit can be arranged laterally by a latent image carrier designed as an image roller. This has a very advantageous effect on the height of the device, which is very noticeable especially in color printers or color copiers.
Sehr vorteilhaft ist weiterhin eine Ausführungsform der Erfindung, bei der die Absaugvorrichtung eine Düsenöffnung aufweist, welche derart ausgebildet ist, daß mittels ihr wenigstens doppelt, insbesondere wenigstens achtmal, vorzugsweise wenigstens zehnmal soviel Luft aus der dem Zuführelement abgewandten Richtung ansaugbar ist, als aus der dem Zuführelement zugewandten Richtung. Hierdurch wird erreicht, daß die die Absaugvorrichtung verlassenden Partikel des Dispersanten wieder in die Absaugvorrichtung gesaugt werden. Durch den Sog können die Partikel zerstäuben, wodurch das auf dem Latentbildträger haftende Farbmittelbild etwas getrocknet wird. Durch Steuerung des Unterdrucks kann somit der Grad der Trocknung des auf dem Latentbildträger haftenden Farbmittel- 5 bildes eingestellt werden. Dies ist sehr vorteilhaft, da bei manchen Anwendungen gefordert wird, daß das auf dem Latentbildträger haftende Farbmittelbild nicht vollständig trocken ist.Also very advantageous is an embodiment of the invention in which the suction device has a nozzle opening which is designed such that at least twice, in particular at least eight times, preferably at least ten times as much air can be sucked in from the direction away from the feed element than by means of the latter Feed element facing direction. This ensures that the particles leaving the suction of the Dispersants are sucked back into the suction device. By the suction, the particles can atomize, whereby the colorant image adhering to the latent image carrier is slightly dried. Thus, by controlling the negative pressure, the degree of drying of the colorant image adhering to the latent image carrier can be adjusted. This is very advantageous because in some applications it is required that the colorant image adhering to the latent image carrier is not completely dry.
Besonders vorteilhaft ist eine Ausführungsform der Erfindung, bei der ein Begren- lo zungselement vorhanden ist, mittels welchem die Farbmittel-Zuführmenge des Zuführelements einstellbar ist. Hierdurch läßt sich erreichen, daß der Latentbildträger exakt mit einer solchen Farbmittelmenge beaufschlagt wird, welche zur Erzeugung eines gesättigten Farbmittelbildes erforderlich ist. Dies ist sehr vorteilhaft im Hinblick auf die Entfernung überschüssiger Teile des flüssigen Farbmittels i5 von dem Latentbildträger, da die Menge der überschüssigen Teile des flüssigen Farbmittels hierdurch so gering wie möglich ist.Particularly advantageous is an embodiment of the invention, in which a Begren- ling element is present, by means of which the colorant supply amount of the feed element is adjustable. In this way it can be achieved that the latent image carrier is applied exactly with such a colorant amount, which is required to produce a saturated colorant image. This is very advantageous in terms of removing excess parts of the liquid colorant i5 from the latent image carrier, since the amount of the excess parts of the liquid colorant is thereby as small as possible.
Bei einer weiteren besonderen Ausführungsform der Erfindung ist vorgesehen, daß das Zuführelement sowie das Abnahmeelement in einem zweiten vorbe-In a further particular embodiment of the invention it is provided that the feed element and the decrease element in a second
2o stimmten Abstand von dem Latentbildträger in einer lösbar mit der Vorrichtung verbundenen Entwicklereinheit angeordnet sind. Hierdurch vereinfacht sich die Anordnung des Zuführelements sowie des Abnahmeelements an dem Latentbildträger erheblich. Da das Zuführelement und das Abnahmeelement in der Entwicklereinheit fixiert sind, ist es bei dieser Ausführungsform der erfindungsgemäßen2o agreed distance from the latent image carrier in a releasably connected to the device developer unit are arranged. This considerably simplifies the arrangement of the feed element and of the take-off element on the latent image carrier. Since the feed element and the decrease element are fixed in the developer unit, it is in this embodiment of the invention
25 Vorrichtung nur noch erforderlich, die Entwicklereinheit exakt an dem Latentbildträger anzuordnen. Dies läßt sich in vorteilhafterweise mittels eines Anschlags vornehmen, mittels dem die Position der Entwicklereinheit exakt und reproduzierbar vorgegeben werden kann.25 device only required to arrange the developer unit exactly on the latent image carrier. This can be advantageously done by means of a stop, by means of which the position of the developer unit can be specified exactly and reproducibly.
30 Durch die feste, in der Regel unveränderbare Anordnung des Zuführelements und des Abnahmeelements in der Entwicklereinheit ist der Abstand des Abnahmeelements von dem Zuführelement ebenfalls fest vorgegeben. Hierdurch braucht der Abstand des Abnahmeelements von dem Zuführelement insbesondere nach einer Entfernung der Entwicklereinheit von dem Latentbildträger nicht erneut justiert werden, wodurch erreicht wird, daß die mittels der Vorrichtung hergestellten Erzeugnisse von gleichbleibender Qualität sind.30 Due to the fixed, usually unchangeable arrangement of the feed and the take-off element in the developer unit, the distance of the pickup element is also fixed by the feed element. This requires the The distance of the pickup element from the feed element, in particular after a removal of the developer unit from the latent image carrier, can not be readjusted, as a result of which the products produced by means of the device are of consistent quality.
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Die Vorteile dieser Ausführungsform der erfindungsgemäßen Vorrichtung treten insbesondere bei Wartungsarbeiten zutage. Statt das Zuführelement beziehungsweise das Abnahmeelement jeweils separat von der Vorrichtung zu entfernen beziehungsweise wieder an der Vorrichtung anzuordnen, braucht bei der erfin- lo dungsgemäßen Vorrichtung lediglich die gesamte Entwicklereinheit entfernt beziehungsweise wieder angebracht zu werden. Aufwendige Justierarbeiten entfallen nahezu vollständig.The advantages of this embodiment of the device according to the invention are particularly evident during maintenance work. Instead of removing the supply element or the removal element separately from the device or to arrange it again on the device, in the device according to the invention, only the entire developer unit needs to be removed or reattached. Costly adjustments are almost completely eliminated.
Bei einer weiteren besonderen Ausführungsform der Erfindung ist vorgesehen, i5 daß zwischen dem Zuführelement und dem Abnahmeelement aus einem leitfähigen Material bestehende Elemente angeordnet sind, welche in einem vierten vorbestimmten Abstand von dem Latentbildträger angeordnet sind. Durch die aus einem leitfähigen Material bestehenden Elemente kann in vorteilhafter Weise erreicht werden, daß über eine längere Strecke ein zwischen der Entwicklereinheit 2o und dem Latentbildträger bestehendes elektrisches Feld vorhanden ist. Hierdurch findet eine sehr gute Entwicklung des Farbmittelbildes auf dem Latentbildträger statt. Sofern ein zweites Zuführelement vorhanden ist, können die betreffenden Elemente aus einem leitfähigen Material ausgebildet werden. Zweckmäßigerweise besteht die Entwicklereinheit vollständig aus einem leitfähigen Material.In a further particular embodiment of the invention, it is provided that elements which are composed of a conductive material and are arranged at a fourth predetermined distance from the latent image carrier are arranged between the feed element and the take-off element. By means of the elements made of a conductive material, it can be achieved in an advantageous manner that there is an electric field existing between the developer unit 2o and the latent image carrier over a relatively long distance. As a result, there is a very good development of the colorant image on the latent image carrier. If a second feed element is present, the respective elements can be formed from a conductive material. Conveniently, the developer unit is made entirely of a conductive material.
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Sehr vorteilhaft bei der erfindungsgemäßen Vorrichtung ist es, daß sie so ausgebildet sein kann, daß sie seitlich an einem als Bildwalze ausgebildeten Latentbildträger angeordnet werden kann. Hierdurch lassen sich bei geringer Gesamtbauhöhe mehrere Entwicklereinheiten übereinander anordnen, was insbesondere bei 30 Farbdruckern oder Farbkopierem sehr vorteilhaft ist. Des weiteren ist es insbesondere bei der erfindungsgemäßen Vorrichtung sehr vorteilhaft, daß zur Beflu- tung der Bildwalze, Entwicklung des Latentbildes und Entfernung der überschüs- sigen Teile des flüssigen Farbmittels von dem Latentbildträger keine beweglichen Teile vorhanden sind. Durch die Absaugung der überschüssigen Teile des flüssigen Farbmittels von dem Latentbildträger kann darauf verzichtet werden, eine sich mit der Bildwalze drehende Abscheidewalze zu verwenden. Dies ist sehr 5 vorteilhaft, da die Abscheidewalze regelmäßig sehr aufwendig an der Bildwalze angeordnet sein muß, damit sie auch bei einer unrunden Bildwalze beziehungsweise bei einem unrunden Lauf der Bildwalze nicht mit der Oberfläche der Bildwalze in Berührung kommt.Very advantageous in the device according to the invention is that it can be designed so that it can be arranged laterally on a designed as an image roller latent image carrier. As a result, a plurality of developer units can be arranged one above the other at a low overall height, which is very advantageous in particular with 30 color printers or color copiers. Furthermore, it is very advantageous, in particular in the device according to the invention, for the puffing of the image roller, the development of the latent image and the removal of the excess Sigen parts of the liquid colorant from the latent image carrier no moving parts are present. By the suction of the excess parts of the liquid colorant from the latent image carrier can be dispensed with, to use a rotating with the image roller deposition roller. This is very advantageous, since the deposition roller must be arranged at great expense on the image roller, so that it does not come into contact with the surface of the image roller even in the case of a non-circular image roller or in the case of a non-circular motion of the image roller.
lo Weitere Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung eines besonderen Ausführungsbeispiels unter Bezugnahme auf die Zeichnung.Other advantages of the present invention will become apparent from the following description of a particular embodiment with reference to the drawings.
Es zeigt die einzige Figur eine schematische Anordnung einer erfindungsgemäßen i5 Vorrichtung von der Seite im Schnitt.The single figure shows a schematic arrangement of an i5 device according to the invention from the side in section.
Wie der Figur entnommen werden kann, ist an einem als Bildwalze 1 ausgebildeten Latentbildträger 1 eine Entwicklereinheit 2 angeordnet. Die Bildwalze 1 dreht sich in Richtung des Pfeils 1'. Die Entwicklereinheit 2 besteht aus Metall wie 2o beispielsweise Aluminium und ist mit einer in der Figur nicht dargestellten Spannungsquelle verbunden, so daß sie gegenüber der Bildwalze 1 ein Potential von einigen hundert Volt (etwa vierhundert bis siebenhundert Volt) aufweist.As can be seen from the figure, a developer unit 2 is arranged on a latent image carrier 1 designed as image roller 1. The image roller 1 rotates in the direction of the arrow 1 '. The developer unit 2 is made of metal such as aluminum, for example, and is connected to a power source, not shown in the figure, so as to have a potential of several hundred volts (about four hundred to seven hundred volts) from the image drum 1.
An ihrem der Bildwalze 1 zugewandten Ende weist die Entwicklereinheit 2 ein als 25 schlitzförmige Zuführdüse ausgebildetes Zuführelement 3a auf. Die Zuführdüse 3a wird durch eine obere Wandung 8 der Entwicklereinheit 2 sowie einer in Richtung der Bildwalze 1 verschiebbaren Platte 5a gebildet. Durch die Platte 5a läßt sich die Menge des durch die Zuführdüse 3a auf die Oberfläche der Bildwalze 1 geleiteten Farbmittels, welches aus einer Trägerflüssigkeit und Tonerteilchen besteht, 0 einstellen. Je nach Abstand der Platte 5a von der Bildwalze 1 ist die Menge des Farbmittels größer oder kleiner. Der Abstand der Platte 5a von der Bildwalze 1 wird so eingestellt, daß das auf der Bildwalze 1 vorhandene Latentbild zu einem gesättigten Farbmittelbild eingefärbt wird.At its end facing the image roller 1, the developer unit 2 has a feed element 3a designed as a slot-shaped feed nozzle. The feed nozzle 3a is formed by an upper wall 8 of the developer unit 2 and a displaceable in the direction of the image roller 1 plate 5a. Through the plate 5a, the amount of colorant passed through the supply nozzle 3a onto the surface of the image drum 1, which consists of a carrier liquid and toner particles, can be adjusted. Depending on the distance of the plate 5a from the image roller 1, the amount of colorant is larger or smaller. The distance of the plate 5 a from the image roller. 1 is adjusted so that the present on the image drum 1 latent image is colored to a saturated colorant image.
Unterhalb der Platte 5a ist ein Rückflußkanal 6a angeordnet, welcher nicht an der 5 Bildwalze 1 haften bleibendes Farbmittel auffängt. Der Rückfllußkanal 6 ist mit dem Reservoir des Farbmittels verbunden, so daß das vom Rückflußkanal 6 aufgefangene Farbmittel wiederverwendet und erneut der Bildwalze 1 zugeführt werden kann.Below the plate 5a, a return channel 6a is arranged, which does not catch on the image roller 1 adhering colorant. The reflux channel 6 is connected to the reservoir of the colorant, so that the collected from the return channel 6 colorant can be reused and re-image roller 1 can be supplied.
lo Die der Bildwalze 1 zugewandte Wandung 7a des Rückflußkanals 6a ist so ausgebildet, daß sie in Drehrichtung 1 ' der Bildwalze 1 über einen Bereich von wenigen Zentimetern in einem Abstand von etwa 0,2 Millimeter von der Oberfläche der Bildwalze 1 verläuft. Hierdurch bildet sie einen Abstreifer 7a, welcher die Dicke des auf der Bildwalze 1 haftenden Farbmittels auf etwa 0,2 Millimeter i5 begrenzt. Der überschüssige Teil des Farbmittels wird durch den Abstreifer 7a zurückgehalten und gelangt in den Rückflußkanal 6a.The wall 7a of the return flow channel 6a facing the image roller 1 is designed so that it runs in the direction of rotation 1 'of the image roller 1 over a range of a few centimeters at a distance of approximately 0.2 millimeters from the surface of the image roller 1. In this way, it forms a scraper 7a, which limits the thickness of the colorant adhering to the image roller 1 to about 0.2 millimeters i5. The excess portion of the colorant is retained by the scraper 7a and enters the return channel 6a.
Unterhalb des Rückflußkanals 6a ist eine zweite Zuführdüse 3b angeordnet, welche durch die Wandung des Rückflußkanals 6a sowie einer zweiten Platte 5b 2o gebildet wird. Die zweite Platte 5b ist ebenfalls in Richtung der Bildwalze 1 verschiebbar. Des weiteren ist unterhalb der zweiten Zuführdüse 3b ist ein zweiter Rückflußkanal 6b angeordnet, dessen der Bildwalze 1 zugewandte Wandung einen zweiten Abstreifer 7b bildet, der ebenfalls die Dicke des auf der Bildwalze 1 haftenden Farbmittels auf etwa 0,2 Millimeter begrenzt.Below the reflux channel 6a, a second feed nozzle 3b is arranged, which is formed by the wall of the return channel 6a and a second plate 5b 2o. The second plate 5b is also displaceable in the direction of the image roller 1. Furthermore, below the second feed nozzle 3b, a second return channel 6b is arranged, whose wall facing the image roller 1 forms a second scraper 7b, which likewise limits the thickness of the colorant adhering to the image roller 1 to approximately 0.2 millimeters.
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Durch die Anordnung einer zweiten Zuführdüse 3b sowie eines zweiten Rückflußkanals 6b läßt sich erreichen, daß auf dem Latentbildträger in jedem Fall ein gesättigtes Farbmittelbild aufgebracht werden kann. Sofern dies bereits mittels der ersten Zuführdüse 3a erreicht wird, kann selbstverständlich auf die zweite Zuführ- 3o düse 3b sowie den zweiten Rückflußkanal 6b verzichtet werden. An der unteren Seite der Entwicklereinheit 2 ist ein mit einem Unterdruck beaufschlagbarer Kanal 4 angeordnet, welcher eine Ausgangsöffnung 4a hat, mittels welcher überschüssiges Farbmittel von der Bildwalze 1 absaugbar ist. Der Unterdruck ist einstellbar, so daß ein solcher Unterdruck eingestellt werden kann, daß nahezu alle überschüssigen Teile des flüssigen Farbmittels von der Bildwalze 1 entfernt werden, jedoch die das Farbmittelbild bildenden Teile auf der Bildwalze 1 haften bleiben. Die Ausgangsöffnung 4a des Kanals 4 ist so ausgebildet, daß die von dem Kanal 4 angesaugte Luft zum weitaus überwiegenden Teil von der der Zuführdüse 3a abgewandten Seite in den Kanal 4 gelangt. Das heißt, die in den Kanal 4 eingesaugte Luft gelangt durch einen Spalt, der von der unteren Wandung der Entwicklereinheit 2 und der Oberfläche der Bildwalze 1 gebildet wird. Hierdurch findet eine Zerstäubung von noch an der Bildwalze 1 haftender Trägerflüssigkeit statt.The arrangement of a second feed nozzle 3b and a second return channel 6b can achieve that a saturated colorant image can be applied to the latent image carrier in each case. If this is already achieved by means of the first feed nozzle 3a, it is of course possible to dispense with the second feed nozzle 3b and the second return flow channel 6b. Disposed on the lower side of the developer unit 2 is a channel 4 which can be subjected to a negative pressure and which has an outlet opening 4a, by means of which excess colorant can be sucked out of the image roller 1. The negative pressure is adjustable, so that such a negative pressure can be adjusted that almost all excess parts of the liquid colorant are removed from the image drum 1, but stick the parts forming the colorant image on the image roller 1. The outlet opening 4a of the channel 4 is formed so that the sucked from the channel 4 air for the vast majority of the feed nozzle 3a side facing away from the channel 4 passes. That is, the air sucked into the passage 4 passes through a gap formed by the lower wall of the developer unit 2 and the surface of the image drum 1. As a result, an atomization of still adhering to the image roller 1 carrier liquid takes place.
Zur Vermeidung, daß von dem Kanal 4 angesaugte Luft aus Richtung der Zuführdüsen 3a, 3b angesaugt wird, ist unterhalb des zweiten Rückflußkanals 6b ein Entkopplungskanal 9 angeordnet. Beide Enden des Entkopplungskanals 9 sind offen, so daß Umgebungsluft ungehindert in den Entkopplungskanal 9 eindringen kann.In order to prevent air drawn in from the channel 4 from being sucked in from the direction of the feed nozzles 3a, 3b, a decoupling channel 9 is arranged below the second return channel 6b. Both ends of the decoupling channel 9 are open, so that ambient air can freely penetrate into the decoupling channel 9.
Die Entwicklereinheit 2 ist in einer in der Figur nicht dargestellten Führung angeordnet, so daß sie auf einfache Weise von der Bildwalze 1 entfernt beziehungsweise an die Bildwalze 1 angeordnet werden kann. Hierzu wird die Entwicklereinheit 2 in Richtung des Pfeils 2' verschoben.The developer unit 2 is arranged in a guide, not shown in the figure, so that it can be removed in a simple manner from the image roller 1 or arranged on the image drum 1. For this purpose, the developer unit 2 is moved in the direction of the arrow 2 '.
Zur Einstellung des Abstands der Entwicklereinheit 2 und damit insbesondere der Abstände der Platte 5a und der zweiten Platte 5b sowie des Abstreifers 7a und des zweiten Abstreifers 7b ist ein Anschlag 2a vorhanden, gegen den ein vorstehendes Element 2b der Entwicklereinheit 2 anstößt. Durch die Führung sowie den Anschlag 2a läßt sich die Entwicklereinheit 2 problemlos mit höchster Genauigkeit an der Bildwalze 1 anordnen. Durch die an die Krümmung der Bildwalze 1 angepaßte Stirnseite der Entwicklereinheit 2 läßt sich die Entwicklereinheit 2 seitlich an der Bildwalze 1 anordnen. Hierdurch wird eine geringe Bauhöhe der Vorrichtung erreicht, wodurch mehrere Vorrichtungen bei geringer Gesamtbauhöhe übereinander angeordnet werden können, wie dies beispielsweise bei Farbdruckern oder Farbkopierern der Fall sein kann. To adjust the distance of the developer unit 2, and thus in particular the distances of the plate 5a and the second plate 5b and the scraper 7a and the second scraper 7b, a stopper 2a is provided, against which a protruding element 2b of the developer unit 2 abuts. Through the guide and the stopper 2a, the developer unit 2 can be easily arranged with the highest accuracy on the image drum 1. By adapted to the curvature of the image drum 1 end face of the developer unit 2, the developer unit 2 can be arranged laterally on the image drum 1. As a result, a small overall height of the device is achieved, whereby a plurality of devices can be arranged one above the other at a low overall height, as may be the case for example with color printers or color copiers.

Claims

Patentansprüche claims
1. Vorrichtung zum elektrographischen Drucken oder Kopieren unter Verwendung 5 flüssiger Farbmittel, mit einem Latentbildträger (1 ) und wenigstens einem als schlitzförmige Zuführdüse ausgebildeten Zuführelement (3a, 3b), mittels dem das flüssige Farbmittel auf den Latentbildträger (1) aufbringbar ist, sowie einem als Absaugelement ausgebildeten Abnahmeelement (4), mittels dem überschüssige Teile des flüssigen Farbmittels von dem Latentbildträger (1) entfernbar sind, lo dadurch gekennzeichnet, dass zwischen dem Abnahmeelement (4) und dem Zuführelement (3a, 3b) ein Entkopplungskanal (9) angeordnet ist.1. An apparatus for electrographic printing or copying using 5 liquid colorant, comprising a latent image carrier (1) and at least one feed element (3a, 3b) designed as a slot-shaped feed nozzle, by means of which the liquid colorant can be applied to the latent image carrier (1) and a Removal element (4) designed as a suction element, by means of which excess parts of the liquid colorant can be removed from the latent image carrier (1), characterized in that a decoupling channel (9) is arranged between the acceptance element (4) and the feed element (3a, 3b) ,
2. Vorrichtung nach Anspruch 1 , i5 dadurch gekennzeichnet, dass in Bewegungsrichtung (1') des Latentbildträgers (1) hinter der Zuführdüse (3a, 3b) ein Abstreifer (7a, 7b) angeordnet ist, welcher in einem ersten vorbestimmten Abstand von dem Latentbildträger (1) angeordnet ist.2. Apparatus according to claim 1, characterized i5 that in the direction of movement (1 ') of the latent image carrier (1) behind the feed nozzle (3a, 3b) a scraper (7a, 7b) is arranged, which at a first predetermined distance from the latent image carrier (1) is arranged.
20 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass in Bewegungsrichtung (V) des Latentbildträgers (1) vor dem Abstreifer (7a, 7b) ein Rückflußkanal (6a, 6b) angeordnet ist, derart, dass vom Abstreifer (7a, 7b) zurückgehaltenes flüssiges Farbmittel in den Rückflußkanal (6a, 6b) gelangt.20 3. A device according to claim 2, characterized in that in the direction of movement (V) of the latent image carrier (1) in front of the scraper (7a, 7b) a return channel (6a, 6b) is arranged, such that the scraper (7a, 7b) retained liquid colorant in the return channel (6a, 6b) passes.
2525
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass ein Begrenzungselement (5a, 5b) vorhanden ist, mittels welchem die Farbmittel-Zuführmenge des Zuführelements (3) einstellbar ist.4. Device according to one of claims 1 to 3, characterized in that a limiting element (5a, 5b) is present, by means of which the colorant supply amount of the feed element (3) is adjustable.
30 30
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Zuführelement (3a, 3b) sowie das Abnahmeelement (4) in einem zweiten 5 vorbestimmten Abstand zueinander in einer lösbar mit der Vorrichtung verbundenen Entwicklereinheit (2) angeordnet ist.5. Device according to one of claims 1 to 4, characterized in that the feed element (3a, 3b) and the decrease element (4) in a second 5 predetermined distance from one another in a releasably connected to the device developer unit (2) is arranged.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, lo dass ein Anschlag (2a) vorhanden ist, der den Abstand der Entwicklereinheit (2) von dem Latentbildträger (1) auf einen dritten vorbestimmten Abstand begrenzt.6. Apparatus according to claim 5, characterized in that a stop (2a) is provided which limits the distance of the developer unit (2) from the latent image carrier (1) to a third predetermined distance.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, i5 dass das Abnahmeelement (4) eine Düsenöffnung (4a) aufweist, welche derart ausgebildet ist, daß mittels ihr wenigstens doppelt, insbesondere wenigstens achtmal, vorzugsweise wenigstens zehnmal soviel Luft aus der dem Zuführelement (3a, 3b) abgewandten Richtung ansaugbar ist als aus der dem Zuführelement (3a, 3b) zugewandten Richtung.7. Device according to one of claims 1 to 6, characterized in that the acceptance element (4) has a nozzle opening (4a) which is formed such that by means of it at least twice, in particular at least eight times, preferably at least ten times as much air from the the feed element (3a, 3b) facing away from the direction of the feed element (3a, 3b) facing is sucked.
2020
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass zwischen dem Zuführelement (3a) und dem Abnahmeelement (4) aus einem leitfähigen Material bestehende Elemente (5a, 7a, 5b, 7b) angeordnet sind, welche 25 in einem vierten vorbestimmten Abstand von dem Latentbildträger (1 ) angeordnet sind. 8. Device according to one of claims 1 to 7, characterized in that between the feed element (3a) and the decrease element (4) of a conductive material existing elements (5a, 7a, 5b, 7b) are arranged, which 25 in a fourth predetermined distance from the latent image carrier (1) are arranged.
EP05850172A 2004-12-23 2005-12-19 Device for electrographic printing or copying using liquid colouring agents Expired - Lifetime EP1839097B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004061961A DE102004061961B4 (en) 2004-12-23 2004-12-23 Apparatus for electrographic printing or copying using liquid colorants
PCT/DE2005/002281 WO2006066554A1 (en) 2004-12-23 2005-12-19 Device for electrographic printing or copying using liquid colouring agents

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EP1839097A1 true EP1839097A1 (en) 2007-10-03
EP1839097B1 EP1839097B1 (en) 2008-06-18

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EP (1) EP1839097B1 (en)
JP (1) JP5130050B2 (en)
CN (1) CN101069135B (en)
AT (1) ATE398795T1 (en)
AU (1) AU2005318733B2 (en)
CA (1) CA2586633C (en)
DE (2) DE102004061961B4 (en)
ES (1) ES2308598T3 (en)
WO (1) WO2006066554A1 (en)

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DE102017219709A1 (en) * 2016-11-28 2018-05-30 Heidelberger Druckmaschinen Ag press

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JP5130050B2 (en) 2013-01-30
JP2008525827A (en) 2008-07-17
US7639971B2 (en) 2009-12-29
ES2308598T3 (en) 2008-12-01
WO2006066554A1 (en) 2006-06-29
ATE398795T1 (en) 2008-07-15
DE102004061961B4 (en) 2006-09-21
DE502005004487D1 (en) 2008-07-31
CA2586633C (en) 2010-11-16
AU2005318733A1 (en) 2006-06-29
CN101069135A (en) 2007-11-07
US20070237550A1 (en) 2007-10-11
AU2005318733B2 (en) 2010-01-28
CN101069135B (en) 2010-08-18
EP1839097B1 (en) 2008-06-18
DE102004061961A1 (en) 2006-07-13
CA2586633A1 (en) 2006-06-29

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