EP0988579B1 - Vorrichtung und verfahren zum einfärben eines ladungsbildes über eine tonersprüheinrichtung - Google Patents
Vorrichtung und verfahren zum einfärben eines ladungsbildes über eine tonersprüheinrichtung Download PDFInfo
- Publication number
- EP0988579B1 EP0988579B1 EP98928271A EP98928271A EP0988579B1 EP 0988579 B1 EP0988579 B1 EP 0988579B1 EP 98928271 A EP98928271 A EP 98928271A EP 98928271 A EP98928271 A EP 98928271A EP 0988579 B1 EP0988579 B1 EP 0988579B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- toner
- charge
- region
- acceptance
- application element
- 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
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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
Definitions
- the invention relates to an apparatus and a method for Coloring a charge image using a toner spraying device for electrographic printing or copying machines with high Image carrier speed.
- the known two-component magnetic brush systems work with a mixture of toner particles and ferromagnetic Carrier particles that charge each other triboelectrically.
- the soft magnetic carrier particles form in one Magnetic field from a brush, which is in direct contact with the charge pattern - e.g. B. on a photoconductor - brought becomes.
- the charged toner particles are made according to the Distribution of the electric field and the toner charge the magnetic brush out on the surface of the charge-bearing Element deposited.
- To develop an image To achieve high quality, the toner particles have to be very be homogeneously charged and the partially conductive brush do not discharge the photoconductor in contact. These conditions are especially at high development speed and high toner throughput is very difficult to achieve.
- Conductive one-component magnetic brush systems work without a carrier material.
- the toner particles themselves contain one ferromagnetic component.
- the toner particles form in Magnetic field from a brush structure, at the ends of each charged toner particles. Charging the Toner particles are transported by charge from the carrier roller starting from one toner particle to another.
- the ferromagnetic Material component the color rendering suitability of these toners noticeably restricted.
- the coloring power often limited by the fact that because of the Conductivity of the particle brush only the last one Particles deposited and particles too weakly charged again be picked.
- the conductivity of the Toner particles transferring from the photoconductor to the final image carrier to another subcarrier on restrictions - especially with electrostatic toner transfer.
- toner When developing with insulating non-magnetic one-component toner out of a toner air fluid like it out EP 04 94 454B1, toner is in a homogeneous Air flow fluidized and in this fluid by a Corona discharge charged. The charged toner is on a conductive roller deposited on it by electrostatic Powers is liable. The toner can be removed from the roller surface on a surface with a charge pattern corresponding to the local electrical field distribution on this surface jump and thus develop an image-like toner image. Between the above Roller and the one carrying the charge pattern Surface can be inserted one or more additional rollers to the toner particles with the correct charge polarity and the sufficient charge amount from the less or charged toner particles with the wrong polarity separate. In this process of development is the attainable Image quality in terms of uniformity of the color distribution as well as physically in terms of detail limited. In addition, additional efforts for stabilization arise of the fluid, the stability of which is due to the electrical Interactions with the duration of function decreases.
- fine toner particles are in dispersed in a carrier liquid in which they face each other the particle environment in the liquid electrostatically charge.
- the developer liquid is usually in Contact with the surface of the charge-bearing element (e.g. photoconductor).
- the charged toner particles migrate in the direction caused by the electric field and the toner charge is predetermined.
- the "wet" toner image will then transferred to the final image carrier (mostly paper).
- the residual liquid escapes from the toner image (Final image carrier) into the ambient air. This is a significant one Disadvantage if the liquid is an organic solvent, used as a carrier liquid like the others Isopare, is.
- Liquid toner systems are also known where a highly concentrated solution of uploaded particles under the action of an electric field from one Application roller surface on those areas of the Charge-bearing element jumps into which the electrostatic Force vector, which consists of the field vector and the Toner charge is formed in the liquid.
- These systems So far have also the disadvantage that organic solvents can be used as carrier liquids.
- the device contains two as Charging device for the brushes serving the toner with deflectable Bristles that mechanically charge the charged toner particles hurling against a developer roller such that forms a toner layer on the peripheral surface thereof.
- the one on the Developer roller sticking toner is then in the range of one Developer nip, where, after overcoming the Developer gap the latent charge image on the record carrier stains.
- the object of the invention is therefore a device and a Process for developing a charge image with little interference at high image carrier speed in a print or To provide copier.
- This task is performed according to the characteristics of the first and thirteenth Claim resolved.
- the z. B. can be a roller, a produces uniform, homogeneous toner layer. After that, this one Depending on the charge pattern, the toner layer is at a close distance transferred carrier medium and that by the individual toner particles skip the developer gap and so color the charge image on the carrier medium.
- Toner spray devices can be used in the invention come as they are known from powder coating systems.
- powder coating guns are, for example in U.S. Patent 5,482,214 and U.S. Patent 4802625.
- An electrophotographic high-performance printing system not shown here in detail with a printing performance of more than 200 pages / min. comprises one or more of the developing devices shown in FIG. 1. These development devices are used to color a latent charge image on a carrier medium 10 with the aid of a character generator.
- the carrier medium 10 can be a photoconductor drum, ie a metallic body with a photoconductive surface, for example made of As 2 Se 3 or - as shown here - an OPC photoconductor tape.
- the photoconductor or the carrier medium 10 is first charged to - 500 V and then discharged to -50 V with the help of the character generator.
- the carrier medium 10 is located at approximately - 500 V, in the region of the toner image at - 50 V. It is also possible, however, to first charge the carrier medium to + 500 V and then depending on the character + 50 V to discharge.
- the toner image is colored with the help of the one shown Developer device using one-component toner or also of two-component toner, the toner particles from about 10 ⁇ m in size on any resin basis such as polystyrene or polyester and in the case of two-component toner electromagnetic carrier particles.
- the toner particles are deposited on the photoconductor depending on the charge pattern. You will be in a transfer station after the development process transferred to paper in the usual way and then e.g. in a thermal pressure fixing device.
- the developing device includes a toner sprayer 11, which is analogous to a powder coating device can be built.
- powder coating devices are for example from US 5482214 and US 4802625 known. They generally consist of a feed pipe 12 with a nozzle 13 shown in FIG. 2, which in an electrode 14 in the form of a corona charging device in its mouth region having.
- the toner spraying device 11 With the toner spraying device 11 a mixture stream is generated from a toner-air mixture, which has toner particles with a defined toner charge.
- the toner spray device in the pump system as in a known powder coating device Toner dispersed in air and this mixture flow over the Feed pipe 12 fed to the nozzle 13 and so a directed Spray jet generated.
- the electrode 14 is supplied with a voltage of +5 or - 5 KV or greater and sprayed charges onto the toner particles, which then have a toner charge of preferably ⁇ 10 ⁇ C / g to ⁇ 30 ⁇ C / g.
- the electrode acting as a corona discharge device can be in the mixture flow or in the immediate vicinity of the mixture flow 15 may be arranged. It loads the toner particles in a defined manner on.
- the toner application efficiency is defined as the ratio of the receiving surface (application element 16) deposited Mass flow (toner) to that transported in the air flow Mass flow (toner).
- an application element 16 arranged in the area of the mixture flow 15 .
- it consists of a Metal roller with a partially conductive surface e.g. out amorphous carbon, so the distance of the toner charge and whose mirror charge is large enough, the adhesion of the toner to Application element 16 to enable and small enough to do that not to make the required transfer field too large, because the photoconductor charge is limited.
- a roller-shaped one Application element 16 it is also possible Endless belt to use.
- the application element 16 is motorized in the direction of the arrow emotional. There is a corona device on the application element 16 17 arranged, which is used with the help of the toner spraying device 11 applied to the application element 16 To apply an ion current to the toner layer and thus to even out the charge in the toner layer.
- the surface the application element 16 is in tight Distance to the carrier medium 10 and that at a distance of can be smaller than 100 ⁇ m, the gap being the actual one Developer area or transfer area 18 defined.
- the Carrier medium 10 in this case the photoconductor tape, from a spacer roller 19 out.
- the transmission area 18 is a stripping element 20 made of elastic material, which is used for residual toner to be stripped from the application element 16 and via a conveyor 21 to supply a toner reservoir.
- the A further corona device is arranged in front of the stripping element 20 23rd
- a mixture stream 15 in the form of a spray jet of charged toner particles is generated in a transport air stream with the help of the toner spray device 11.
- the application element 16 is at an application potential of ⁇ 450 V. Due to these voltage conditions in connection with the toner charge, the toner particles accumulate in a receiving area 22 on the surface of the application element 16. The attachment of the toner particles is supported by their kinetics (momentum). The kinetics in turn depend on the speed of the transport air flow carrying the toner particles.
- the pulse of the toner particles increases the toner application efficiency TAW. There they form a uniform, homogeneous layer with a layer thickness of approximately 1-3 toner layers or more.
- This layer is charged with an ion current by means of the corona charging device 17, in order to thereby uniform the charge in the layer.
- the receiving area 22 with the toner layer reaches the transfer area 18 with the developer gap, where the toner particles, depending on the charge image, jump from the application element 16 via the developer gap of about 100 ⁇ m width or less onto the charge image of the carrier medium 10 and color it.
- an auxiliary transmission voltage of preferably 200-500 V can be present between the carrier medium 10 and the application element 16 in the transmission area 18. It is switched on during the entire development period.
- the toner particles accumulate on the charge image of the carrier medium 10 if a suitable toner charge is present, if the charge of the carrier medium 10 is selected correctly and the so-called "jump potential" and the mechanical distance in the developer gap 18 are selected correctly.
- the toner charge is between 10 and 30 ⁇ C / g with a potential of the application element of -450 V.
- the auxiliary transfer voltage is preferably 200-500 V.
- the toner-free areas are on the carrier medium 10 at -500 V, the latent Charge image to approximately - 50 V.
- the field force acting on the toner particles in the developer area is approximately 8 x 10 -8 N.
- the toner particles in the discharged photoconductor area (- 50 V) preferably accumulate in 1-2 toner layers depending on the charge.
- a switchable Deflection device may be provided. This essentially exists from a switchable electrical deflection field 26 between a collecting area 24 and a deflection electrode 25, the pole direction of the field 26 is shown symbolically is.
- the toner spray device is aligned so that in the absence of the additional electrical field 26, the center of the beam at a distance from the application element 16 on this passes and hits the catchment area 24.
- the toner particles become with the correct charge polarity (negative particles) and one sufficiently large amount of charge (10 - 30 ⁇ C / g) in one curved path 27 deflected towards the application element 16. Particles with insufficient charge and different charge polarity fly on the application element (16) over and meet the up in the area of the rays 28 catchment area 24.
- This collecting area 24 can consist of one appropriate sheet metal, on which they collect and then via the conveyor 21 to the toner reservoir be fed again.
- the nozzle 13 as Flat nozzle can be formed with a nozzle tip like this e.g. is known from US Patent 5482214. It is according to the representation of Figure 5 also possible Toner sprayer 11, i.e. the nozzle 13 using a spindle-shaped drive device 29 when applied longitudinally to move the application element 16. Furthermore it is possible according to the representation of Figure 6 several To arrange toner spraying devices (11) with a plurality of nozzles 13, whose spray area covers the entire receiving area 22 of the Cover application element 16.
- a uniform application of toner to the application element 16 or its moving receiving surface can also be replaced by a dense one Dusting the toner around the recording area 22 of the application element 16 can be reached, wherein for fast process control, i.e. at working speeds of the carrier medium 10 of about 1 m / sec. and higher, high Toner loads of approx. 10 - 30 ⁇ C / g are required a precipitation of the toner on the receiving area 22 of the Application element 16 in a very short time, i.e. in a Lead time of less than 0.1 seconds.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Wet Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Description
- 10
- Trägermedium
- 11
- Tonersprüheinrichtung
- 12
- Zuführungsrohr
- 13
- Düse
- 14
- Elektrode
- 15
- Gemischstrom, Sprühstrahl
- 16
- Applikationselement
- 17
- Koronaladeeinrichtung
- 18
- Entwicklungsbereich, Übertragungsbereich
- 19
- Distanzwalze, Rolle
- 20
- Abstreifelement
- 21
- Fördereinrichtung
- 22
- Aufnahmebereich
- 23
- Korona
- 24
- Auffangbereich
- 25
- Ablenkelektrode
- 26
- Feld (Feldgenerator)
- 27
- Tonerpartikelstrahl mit definierten Tonerladungen
- 28
- Tonerpartikelstrahlen mit undefinierten Tonerladungen
- 29
- Spindelantrieb
Claims (13)
- Entwicklungsvorrichtung für ein Druck- oder Kopiergerät zum Einfärben eines Ladungsbildes auf einem Trägermedium (10) mit Tonerpartikel wobei die Vorrichtung auf weist:eine Tonersprüheinrichtung, die eine Einrichtung (12) mit mindestens einer Düse (13) zur Erzeugung eines gerichteten Gemischstromes (15) aus einem Toner-Luftgemisch und eine die Tonerpartikel mit einer definierten Tonerladung beaufschlagenden Ladeeinrichtung (14) aufweist, sowieein in dem Bereich des Gemischstromes (15) angeordnetes Applikationselement (16) mit einer mit einem Applikationspotential beaufschlagten, bewegten Aufnahmefläche, wobei Tonerladung und Applikationspotential so gewählt sind, daß sich zunächst in einem Aufnahmebereich (22) der Aufnahmefläche eine Tonerschicht bildet und daß dann in einem in Bewegungsrichtung der Aufnahmefläche dem Aufnahmebereich (22) nachgeordneten Übertragungsbereich, in dem sich der Aufnahmebereich (22) in dichtem Abstand zum Trägermedium befindet, die Tonerpartikel auf das Trägermedium (10) ladungsbildabhängig überspringen und dieses einfärben.
- Vorrichtung nach Anspruch 1 mit einem zwischen der Toner-Sprüheinrichtung (11) und dem Applikationselement (16) anlegbaren, elektrischen Ablenkfeld (26).
- Vorrichtung nach Anspruch 2 wobei der Gemischstrom (15) so ausgerichtet ist, daß in einem Betriebszustand mit nicht angelegtem elektrischen Ablenkfeld (26) der Gemischstrom an der Aufnahmefläche (22) des Applikationselements (16) vorbei geführt wird und auf einem Auffangbereich (24) auftrifft und daß in einem Betriebszustand mit angelegtem elektrischen Ablenkfeld (26) die Tonerpartikel mit der definierten Tonerladung auf dem Aufnahmebereich (22) und die Tonerpartikel mit einer von der definierten Tonerladung abweichenden Tonerladung auf dem Auffangbereich (24) auftreffen.
- Vorrichtung nach Anspruch 3 wobei der Auffangbereich (24) mit einem Tonervorratsbehälter über eine Tonertransporteinrichtung (21) in Verbindung steht.
- Vorrichtung nach einem der Ansprüche 1 bis 4 mit einer der Aufnahmefläche zugeordneten die Tonerschicht mit einem Ionenstrom beaufschlagenden Ladeeinrichtung (17).
- Vorrichtung nach einem der Ansprüche 1 bis 5 mit einer zwischen der Aufnahmefläche des Applikationselementes (16) und dem Trägermedium (10) im Übertragungsbereich (18) anlegbaren Übertragungshilfsspannung.
- Vorrichtung nach einem der Ansprüche 1 bis 6 mit einem Applikationselement (16) das als Walze ausgebildet ist.
- Vorrichtung nach einem der Ansprüche 1 bis 6 mit einem Applikationselement (16) das als Endlosband ausgebildet ist.
- Vorrichtung nach einem der Ansprüche 1 bis 8 mit einem in Bewegungsrichtung der Aufnahmefläche dem Übertragungsbereich (18) nachgeordneten an der Aufnahmefläche des Applikationselements (16) anliegenden Abstreifelement(20).
- Vorrichtung nach einem der Ansprüche 1 bis 9 mit einem Gemischstrom (15) dessen Sprühbereich den Aufnahmebereich (22) der Aufnahmefläche überdeckt.
- Vorrichtung nach einem der Ansprüche 1 bis 9 mit einem über einen Antrieb (29) längs des Aufnahmebereichs (22) der Aufnahmefläche verfahrbaren Gemischstrom (15).
- Vorrichtung nach einem der Ansprüche 1 bis 9 mit mehreren Gemischströmen (15) deren Sprühbereiche den Aufnahmebereich (22) der Aufnahmefläche überdecken.
- Verfahren zum Einfärben eines Ladungsbildes auf einem Trägermedium (10) mit Toner in einem Druck-oder Kopiergerät mit folgenden Verfahrensschritten:erzeugen eines Gemischstromes (15) in Form eines gerichteten Sprühstrahls aus in einem Transportluftstrom dispergierten Tonerpartikeln die eine definierte Tonerladung aufweisenbesprühen einer bewegten Aufnahmefläche eines mit einem Applikationspotential beaufschlagten Applikationselements (16) mit dem Gemischstrom (15) über mindestens eine Düse (13), so daß sich auf der Aufnahmefläche eine Tonerschicht aus Tonerpartikel bildetladungsbildabhängiges übertragen der Tonerpartikel in einem Übertragungsbereich (18) von dem Applikationselement (16) auf das Trägermedium (10) derart, daß die Tonerpartikel über einen Entwicklerspalt (18) auf das Trägermedium (10) überspringen und dieses ladungsbildabhängig einfärben.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19724950 | 1997-06-12 | ||
DE19724950 | 1997-06-12 | ||
PCT/EP1998/002870 WO1998057233A1 (de) | 1997-06-12 | 1998-05-15 | Vorrichtung und verfahren zum einfärben eines ladungsbildes über eine tonersprüheinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0988579A1 EP0988579A1 (de) | 2000-03-29 |
EP0988579B1 true EP0988579B1 (de) | 2003-02-19 |
Family
ID=7832332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98928271A Expired - Lifetime EP0988579B1 (de) | 1997-06-12 | 1998-05-15 | Vorrichtung und verfahren zum einfärben eines ladungsbildes über eine tonersprüheinrichtung |
Country Status (4)
Country | Link |
---|---|
US (1) | US6377768B1 (de) |
EP (1) | EP0988579B1 (de) |
DE (1) | DE59807252D1 (de) |
WO (1) | WO1998057233A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19857257B4 (de) * | 1998-12-11 | 2006-12-07 | OCé PRINTING SYSTEMS GMBH | Entwicklungsvorrichtung mit Tonersprüheinrichtung, deren Gemischstrom auf einen Auftragsbereich schräg auftrifft |
DE19940037B4 (de) * | 1999-08-24 | 2006-10-05 | OCé PRINTING SYSTEMS GMBH | Elektrografische Druckeinrichtung mit zusätzlichem Farbdruckwerk sowie Verfahren hierzu |
US20040184840A1 (en) * | 2003-03-21 | 2004-09-23 | Xerox Corporation | Ion toner charging device |
US7149460B2 (en) * | 2005-03-16 | 2006-12-12 | Xerox Corporation | Systems and methods for electron charging particles |
US7502580B2 (en) * | 2005-11-30 | 2009-03-10 | Xerox Corporation | Two component development system using ion or electron charged toner |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5137540B1 (de) | 1965-11-19 | 1976-10-16 | ||
US4100884A (en) | 1976-02-25 | 1978-07-18 | Ricoh Company, Ltd. | Rubber developer roller using single component toner |
DE3205989A1 (de) | 1982-02-19 | 1983-09-01 | Hoechst Ag, 6230 Frankfurt | Verfahren und vorrichtung zum entwickeln eines auf einem aufzeichnungstraeger erzeugten elektrostatischen latenten bildes |
JPS614071A (ja) | 1984-06-18 | 1986-01-09 | Olympus Optical Co Ltd | 現像方法および現像装置 |
JPS61151675A (ja) | 1984-12-26 | 1986-07-10 | Sharp Corp | トナ−搬送装置 |
DE3608415A1 (de) | 1986-03-13 | 1987-09-24 | Gema Ransburg Ag | Elektrostatische sprueheinrichtung fuer beschichtungspulver |
US5557376A (en) | 1989-05-15 | 1996-09-17 | Indigo N.V. | Color imaging system |
JP2856820B2 (ja) | 1990-02-28 | 1999-02-10 | 株式会社リコー | 現像装置 |
JPH041782A (ja) | 1990-04-19 | 1992-01-07 | Fujitsu Ltd | トナー選別装置 |
US5532100A (en) | 1991-01-09 | 1996-07-02 | Moore Business Forms, Inc. | Multi-roller electrostatic toning |
DE4141663C2 (de) | 1991-12-17 | 1996-09-19 | Wagner Int | Elektrostatische Pulver-Beschichtungspistole |
US5477285A (en) | 1993-10-06 | 1995-12-19 | Thomson Consumer Electronics, Inc. | CRT developing apparatus |
KR0184123B1 (ko) * | 1996-04-03 | 1999-03-20 | 손욱 | 음극선관 패널의 현상장치 |
DE19857257B4 (de) * | 1998-12-11 | 2006-12-07 | OCé PRINTING SYSTEMS GMBH | Entwicklungsvorrichtung mit Tonersprüheinrichtung, deren Gemischstrom auf einen Auftragsbereich schräg auftrifft |
-
1996
- 1996-05-15 US US09/445,708 patent/US6377768B1/en not_active Expired - Fee Related
-
1998
- 1998-05-15 WO PCT/EP1998/002870 patent/WO1998057233A1/de active IP Right Grant
- 1998-05-15 DE DE59807252T patent/DE59807252D1/de not_active Expired - Fee Related
- 1998-05-15 EP EP98928271A patent/EP0988579B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO1998057233A1 (de) | 1998-12-17 |
US6377768B1 (en) | 2002-04-23 |
EP0988579A1 (de) | 2000-03-29 |
DE59807252D1 (de) | 2003-03-27 |
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