EP0993628A2 - Einkomponenten-entwicklungsstation - Google Patents
Einkomponenten-entwicklungsstationInfo
- Publication number
- EP0993628A2 EP0993628A2 EP98941261A EP98941261A EP0993628A2 EP 0993628 A2 EP0993628 A2 EP 0993628A2 EP 98941261 A EP98941261 A EP 98941261A EP 98941261 A EP98941261 A EP 98941261A EP 0993628 A2 EP0993628 A2 EP 0993628A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- toner
- charge
- toner particles
- development
- 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.)
- Withdrawn
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
- G03G15/0812—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 the developer regulating means, e.g. structure of doctor blade
-
- 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
- G03G2215/0602—Developer
- G03G2215/0604—Developer solid type
- G03G2215/0614—Developer solid type one-component
- G03G2215/0617—Developer solid type one-component contact development (i.e. the developer layer on the donor member contacts the latent image carrier)
Definitions
- the invention relates to an apparatus and a method for developing an electrostatic latent image, which is located on a movable image carrier, with a non-conductive one-component toner.
- a two-component toner contains toner particles and soft magnetic carrier particles which are mixed together, the toner particles adhering electrostatically to the carrier particles.
- the carrier particles with the toner particles adhering to them are transported by means of magnetic brushes into a development zone, where they are transferred to the image carrier in accordance with an electrostatic charge pattern on an image carrier, for example a photoconductor.
- one-component toners made of non-conductive toner particles have significant advantages over two-component toners. No magnetic brushes and the like are required, so that a simple and compact design of the development station is possible.
- the use of single-component toner eliminates the consumption of carrier particles, which wear out over time and have to be replaced. For this reason, attempts have long been made to develop single-component systems with which high print speeds are possible with good print quality.
- a development roller also called an inking roller.
- Some commercially used systems use a regenerating roller made of a foam-like material, which transports toner particles from a toner reservoir to the developing roller. The resulting friction causes the toner particles to become electrically charged, causing them to adhere to the electrically conductive development roller in a more or less thick layer.
- fixed doctor blades were used, which scrape excess toner off the developing roller.
- a hard development roller for example made of aluminum or steel, and a rubber lip as a doctor blade, but also systems with a hard doctor blade made of metal and a development roller made of a rubber material.
- the invention has for its object to provide a one-component development technique that is suitable for high quality, high speed electrographic printing.
- a device for developing an electrostatic latent image which is located on a movable image carrier, with a non-conductive single-component toner is assumed, the device comprising: a toner supply device for conveying and electrically supplying toner particles from a toner reservoir load, a rotatably mounted development roller for receiving the charged toner particles from the toner supply device and for transporting the picked up toner particles, a layer-thickness-producing metering device (doctor blade) which is arranged on the way of the toner particles from the toner supply device to the image carrier, at least one charge carrier generator which is arranged on the Path of the toner particles on the developing roller between the toner supply device and the developing nip is attached to the image cylinder, to produce a homogeneously charged toner layer with defined charges on the developing roller and / or r rotatable doctor roller of the metering device, which is separated by a defined gap from the developing roller, which is larger than the average diameter of the toner particles
- a corresponding method of developing an electrostatic latent image formed on a movable image carrier with a one-component non-conductive toner comprising: electrically charging and conveying toner particles to the surface of a rotating developing roller where they are electrostatically adhere to the surface of the developing roller with the adhering toner particles at a layer thickness-producing metering device (doctor blade) and to convey the toner particles into a gap between the developing roller and the image carrier by transferring them to the image carrier, characterized in that further Means for equalizing the toner layer in layer thickness and charge is provided.
- the invention provides, for example, at least one charge carrier generator in front of the development gap on the image cylinder and / or to be installed in front of the metering device. Surprisingly, it has been shown that higher printing speeds than with the systems described can be achieved in this way and the print quality is improved.
- the invention makes it possible to subsequently uniformly charge toner particles with an undesired charge which pass through the gap between the metering device to the developing roller and the doctor roller, so that the toner particles all carry a defined charge when they reach the image carrier.
- Toner particles on the development roller with highly scattering charges, including even oppositely charged toner particles, are homogeneously recharged by the charge carrier generator provided according to the invention. This also largely decouples the layer thickness and charge generation, since the metering device essentially generates the toner layer thickness and subsequently the charges of the toner particles are applied by the charge generator to the desired and defined extent. A desired higher print quality and also a higher printing speed can thus be achieved with the one-component development station described according to the invention.
- the charge carrier generator is in particular an ion source and can specifically be a corotron or a more suitable and limited to maximum voltage scorotron that radiates onto the surface of the development roller for charging the toner particles, or a plasma generator is used with which the required ion currents are lighter and easier more advantageously and very specifically positive and negative charges can be generated.
- a plasma generator which generates a plasma in the vicinity of the surface of the development roller 2, should preferably be used as the charge carrier generator 9, for example, without being limited to this. With such a plasma generator it is easier and more targeted to generate larger amounts of charge and more homogeneous charges, as are required at high printing speeds and high printing quality.
- the plasma must not be so dense that the toner particles 5 are melted.
- the basic mode of operation for the charge carrier generator is therefore explained on the less known and used plasma generator.
- the plasma source (FIG. 2) consists of electrodes arranged in a very definite manner, which are fed via an RF generator and which generate a so-called “plasma cloud”.
- This plasma source has a certain scope and is interspersed with positive and negative ions, electrons and neutral ones Gas particles in the air.
- Toner particles which are enclosed by this plasma cloud, charge themselves with high uniformity over the plasma voltage surrounding their surface. For example, with spherical particles (spherical shape) the charge is calculated:
- this particle leaves the plasma cloud, it wants to keep the charge and takes according to its capacity to the electrode, e.g. B. to the metallic surface of the developing roller (2, 12), a corresponding voltage.
- the exemplary spherical particle can thus have the maximum charge
- Emax is approx. 30 kV / cm in the air for larger air distances and can be calculated for small distances using the Paaschen law. With small dimensions, much larger breakthrough field strengths are to be expected, so that for
- the charge carrier generator with the RF plasma is an almost ideal means of charging for the problem posed to equalize charges, which allows the targeted and homogeneous charging of toner layers and materials in a predeterminable manner and in particular the successful use of one-component development stations for future new digital printing machines in high Quality and productivity enables.
- This ideal plasma ion source opens up completely new possibilities for the targeted electrostatic influencing of toner charge and materials in a printing machine, e.g. B. on the further path of the toner layer on the image carrier of the one-component development station for direct transfer, if possible, of the entire layer to the substrate (paper).
- An important invention of the further development for the one-component development station of the metering device is characterized in that a fixed distance is set between the surface of the development roller and a rotatably mounted doctor roller, which is larger than the average diameter of the toner particles.
- a gap between the squeegee roller and the development roller is provided according to the invention, for example by a rigid development roller and a rigid squeegee roller at fixed pivot points on a printing press be stored.
- a rigid development roller and a rigid squeegee roller at fixed pivot points on a printing press be stored.
- a possible explanation for the fact that the toner according to the invention only begins to melt at significantly higher speeds than in the prior art is the following:
- a suitable choice of the materials and speeds of the toner supply device ensures that the toner particles which are in the zone transported in the gap, are predominantly charged with the same polarity.
- the repulsion between charges of the same name then ensures that only a limited amount of toner particles get into the gap, so that the toner particles in the gap are subjected to relatively little mechanical stress.
- the toner particles move essentially without friction due to the mutual repulsion, and excess toner is repelled by the electric field formed in the build-up zone and falls back into the toner reservoir.
- the development roller and the doctor roller are rotated in the same direction of rotation, so that their surfaces move in opposite directions, the respective rotational speeds being set such that the surface speed of the doctor roller is substantially less than the surface speed of the developer roller.
- the squeegee roller can either rotate continuously or in small steps, with more or less long downtimes between two rotary movements.
- the doctor roller Since the doctor roller always presents a different surface to the accumulating toner particles, there is no excessive local heating in the build-up zone, which could lead to a melting of the toner particles. Since the toner particles are only in the build-up zone for a relatively short time and since the surface presented to them is constantly renewed, it is harmless if the doctor roller becomes relatively warm during operation.
- the exact value of the speed of rotation of the doctor roller is not critical. Under Under certain circumstances, the doctor roller can also be made to rotate in the opposite direction of rotation to the developing roller, that is to say that its surfaces move in the gap in the same direction. However, there are indications that higher speeds of rotation of the doctor roller are rather unfavorable.
- the width of the gap between the surface of the development roller and the surface of the doctor roller is at least twice the average diameter of the toner particles, the toner layer on the development roller passing through the gap consisting of approximately one or two layers of toner particles.
- the average diameter of the toner particles can be approximately 5 to 15 ⁇ m, and the width of the gap between the surface of the development roller and the surface of the doctor roller can be approximately 15 to 50 ⁇ m.
- the invention is also applicable to one-component systems with a much finer toner.
- a correspondingly narrow gap between the development roller and the doctor roller places high demands on the flatness and concentricity of the rollers.
- the developments of the invention described below make it possible to use a nip, the width of which is a multiple of the average diameter of the toner particles, and yet to obtain a toner layer comprising only one layer or a few layers on the development roller.
- these further developments make it possible to obtain a particularly uniform toner layer.
- the doctor roller like the development roller, is electrically conductive, a defined electrical potential difference can be generated between them. If a DC voltage is used with which the polarity of the charge of the doctor roller is opposed to that of the toner particles, the layer thickness of the toner particles on the developing roller is reduced.
- the DC voltage can, for example, be in the order of 50 to 1000 volts. In this way, a gap can be used that is significantly wider than the average diameter of the toner particles, for example 100 ⁇ m with a diameter of the toner particles of 10 ⁇ m.
- the electrical voltage between the doctor roller and the developing roller can also be an alternating voltage which has, for example, an amplitude between ⁇ 50 and ⁇ 1000 volts and a frequency between 200 and 50,000 Hertz.
- a DC voltage can be used, on which such an AC voltage is superimposed.
- Another measure to produce a uniform and thin toner layer even with the widest possible gap between the doctor roller and the developer roller is to provide several doctor rollers in succession, the width of the gap between the surface of the developer roller and the surfaces of the doctor rollers being either is the same for all squeegee rollers or becomes smaller from squeegee roller to squeegee roller. In both cases the toner layer becomes thinner from doctor roller to doctor roller.
- both the development roller and the doctor roller have a rigid metal body with a hard, wear-resistant surface.
- a high precision of the evenness and concentricity of the development roller and the doctor roller can best be achieved.
- the metallic rollers ensure that the charge generated when the toner particles are charged can flow off again, so that the charge of the subsequent toner particles can continue undisturbed.
- the transfer of the toner particles from the development roller to the image carrier can either take place via a gap between the image carrier and the development roller, which the toner particles jump over (this technique is called gap development), or by the development roller touching the image carrier (this technique is called contact development) ). Intermediate forms of these development techniques are also possible.
- an image carrier in the form of a cylinder such as a photoconductor drum or a drum with a large number of mutually insulated microcells, which can be individually charged by the processor, has a rigid structure.
- the doctor roller has a rigid metal body
- the development roller has a cylindrical foam-like core with a hollow cylindrical sleeve made of a solid material.
- the sleeve of the development roller can be made of metal, or it is made of a plastic which is provided on the outside with a hard, wear-resistant surface. If the plastic or the wear-resistant surface is not inherently conductive, an additional conductive layer can optionally be provided in between.
- Such a flexible development roller is able to nestle against the image cylinder for contact development.
- the layer structure of the development roller can ensure that it is both elastic and has a suitable internal damping, so that the surface of the development roller pressed in on the image cylinder again reaches its exact rest position before it runs past the doctor roller.
- the relatively rigid shell ensures that this rest position is precisely defined. In this way, even with a flexible development roller, a precisely defined gap can be maintained between the development roller and the doctor roller, and lubrication is avoided even at high speeds.
- the toner particles supplied to the developing roller are charged by frictional electricity, which is generated, for example, by a regenerating roller made of a foam-like material, a proven and simple method.
- the charge of the toner particles can be controlled within certain limits by the materials and speeds used.
- At least one charge generator on the way of the toner particles from the toner supply device to the metering device e.g. Doctor roller, adjoin the development roller.
- a conventional elastic doctor blade In order to free the squeegee roller from toner which adheres to the squeegee roller after scraping off excess toner from the developing roller, a conventional elastic doctor blade can be used.
- ⁇ represent the dielectric constant
- p the specific conductivity of the material.
- Fig. 1 Side view of the one-component development station
- Fig. 2 RF charge carrier generator in principle effect and design
- Fig. 4 sectional view of a development station for contact development.
- Fig. 1 shows the basic structure of the one-component development station or the one-component inking unit for an electrographic or electrophotographic.
- the main components are:
- Development roller (2) with a conductive outer jacket (12) for transporting the toner particles into the development gap and returning the excess toner to the toner reservoir (4)
- FIG. 2 shows the principle of operation using the RF charge carrier generator (100) for charging toner particles (5).
- a plasma source (200) acting in a normal atmosphere (300) is designed so that the voltage potential (210) in the plasma source (200) is almost constant and can be controlled accordingly in the range from 0 ... approx. 100V by the control input (110) can.
- the intensity of the plasma source is dimensioned such that the> 5 ⁇ A / cm current flow (220) in the plasma is completely sufficient for the desired speeds in the charging process for printing speeds greater than 0.5 m / s.
- the RF generator works in the frequency range above 40 kHz (up to the megahertz range) and has a power supply input (120) with ground potential (130) in addition to the control input (110) and zone control (140).
- the range of the plasma source is large, so that distances from the development roller of a few millimeters are still sufficient.
- the charge carrier generator has its plasma source in effect across the entire width of the development roller, ie printing width of the substrates (paper) up to, for example, DIN A3 across, but is not limited to this.
- the width of the plasma source can be divided into certain controllable zones so that, for smaller format widths, the development roller (2, 12) is not unnecessarily loaded with plasma, for example, and to make fine adjustments to the desired charge profile over the print width, be it for the sake of the image to be printed or to compensate for other mechanical tolerances.
- the zoned width of the charge source also offers advantages in the production of charge carrier generators, particularly in the case of wider formats.
- the zonal charge sources are controlled via the zone control input (140), which works in principle like the control input (110). It is easily possible to control the zone charge sources individually, or to control and regulate them via a data line from a higher-level computer. Since this is obviously familiar to any person skilled in the art, a special drawing and further illustration are dispensed with.
- 3 shows a development station or an inking unit for a printing press, for developing an electrostatic charge pattern on a rotatable, rigid image cylinder 1 of the printing press.
- a rotatable rigid development roller 2 is mounted parallel to the axis of the image cylinder 1.
- the development roller 2 is made of metal, typically steel, with a wear-resistant outer coating.
- a rotatable regeneration roller 3 which consists of a foam-like material, is mounted axially parallel to the development roller 2.
- the regeneration roller 3 is firstly connected to a toner reservoir 4, in which it is tightly surrounded by toner particles 5, and secondly it presses against the development roller 2, the regeneration roller 3 being compressed at the point of contact.
- a rotatable rigid doctor blade roller 6 made of metal is mounted axially parallel at a very small distance from the development roller 2.
- the doctor roller 6 also has a wear-resistant surface.
- the gap between the surfaces of the development roller 2 and the doctor roller 6 is slightly larger than the diameter of the toner particles 5 (shown extremely enlarged in the figure).
- a sealing lip 8 is also attached between the toner reservoir 4 and the developing roller 6 in order to prevent toner particles 5 from escaping from the toner reservoir 4 at this point.
- the image cylinder 1, the development roller 2, the regeneration roller 3 and the doctor roller 6 are rotated in the directions shown by arrows in the figure, the image cylinder 1 and the developer roller 2 rotating at the same circumferential speed and the doctor roller 6 at a much lower rate Peripheral speed as the developing roller 2 rotates.
- the rotating regeneration roller 3 transports the toner particles 5 to the development roller 2 and charges them electrostatically due to the resulting friction. Due to the electrical charge, the toner particles 5 adhere to the electrically conductive development roller 2 via mirror charges.
- the development roller 2 transports the toner particles 5 in several layers up to the doctor roller 6. There, only a limited number of toner particles 5 can pass the narrow gap between the developer roller 2 and the doctor roller 5.
- the gap is shown only a little wider than the diameter of the toner particles, and exactly one layer of toner particles 5 passes the gap between the developing roller 2 and the doctor roller 5. Due to the electric field, the toner particles transported into the build-up zone in front of the gap 5 generate, excess toner particles 5 are rejected and fall back into the toner reservoir 4. Therefore, the build-up zone in which toner particles 5 accumulate in front of the gap does not grow arbitrarily, but assumes a size-stable state.
- the toner particles 5, which have passed the gap between the development roller 2 and the doctor blade roller 5, are then drawn into the actual development area, where the toner particles 5 are attracted by the charged image areas of the image cylinder 1.
- the Development can take place via contact with the image cylinder 1 or via a gap between the image cylinder 1 and the development roller 2. A gap development is shown in FIG.
- the thickness of the toner layer passed through the gap can be adjusted.
- the lubrication safety does not deteriorate as long as no significant pressure is exerted that the toner particles 5 can no longer avoid, i.e. as long as the gap between the developing roller 2 and the doctor roller 6 is not smaller than the particle diameter.
- the printing speed which could be achieved without lubrication, deteriorated to approximately 15 cm / s.
- the charge carrier generator 9 can also be arranged in front of the doctor roller 6, i.e. on the way of the toner particles 5 from the regeneration roller 3 to the doctor roller 6.
- the charge carrier generator 9 can be a corotron, for example.
- a scorotron in which there is a maximum potential to which the toner particles 5 are charged is more suitable.
- Fig. 4 shows a sectional view of a development station for contact development.
- components that correspond to the exemplary embodiment in FIG. 1 are identified by the same reference numerals, and only the different components are described below.
- an image cylinder 11 is arranged directly on a development roller 12, as is necessary for contact development.
- an inherently elastic development roller 12 is used. The image cylinder 11 and the development roller 12 roll against each other under low pressure, the development roller 12 being pressed in a little at the contact point (not visible in the figure).
- the development roller 12 has a cylindrical core 13 made of an elastic foam material with a hollow cylindrical sleeve 14 made of metal, which can be additionally hardened on its surface.
- the thickness and strength of the hollow cylindrical sleeve 14 and the type of foam material are chosen so that the development roller 12 yields at the point of contact with the image cylinder 11, but that the deformation caused resets so quickly that the development roller 12 at the latest on the doctor roller 6 has reached its target radius again. This is possible because elastic foam materials have a relatively high internal damping.
- the hollow cylindrical sleeve of the development roller 12 can also consist of a suitable plastic, which is provided on the outside with a hard, wear-resistant coating, for example a metallization.
- a suitable plastic which is provided on the outside with a hard, wear-resistant coating, for example a metallization.
- a hard, wear-resistant coating for example a metallization.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
- Developing Agents For Electrophotography (AREA)
- Developing For Electrophotography (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19728309 | 1997-07-03 | ||
DE19728309 | 1997-07-03 | ||
PCT/DE1998/001827 WO1999001799A2 (de) | 1997-07-03 | 1998-07-02 | Einkomponenten-entwicklungsstation |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0993628A2 true EP0993628A2 (de) | 2000-04-19 |
Family
ID=7834448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98941261A Withdrawn EP0993628A2 (de) | 1997-07-03 | 1998-07-02 | Einkomponenten-entwicklungsstation |
Country Status (8)
Country | Link |
---|---|
US (1) | US6055402A (de) |
EP (1) | EP0993628A2 (de) |
JP (1) | JPH1173013A (de) |
CN (1) | CN1133905C (de) |
AU (1) | AU747535B2 (de) |
CA (1) | CA2295906A1 (de) |
DE (1) | DE19819390A1 (de) |
WO (1) | WO1999001799A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001125371A (ja) * | 1999-10-28 | 2001-05-11 | Fujitsu Ltd | 現像装置およびこの装置を有する画像形成装置 |
KR100421024B1 (ko) * | 2002-02-07 | 2004-03-04 | 삼성전자주식회사 | 미터링 롤러를 구비하는 습식 칼라 화상형성장치의 현상장치 |
JP6432236B2 (ja) | 2014-09-17 | 2018-12-05 | 富士ゼロックス株式会社 | 粉体塗装装置、及び粉体塗装方法 |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US481622A (en) * | 1892-08-30 | Sash-holder | ||
US3999515A (en) * | 1975-02-03 | 1976-12-28 | Xerox Corporation | Self-spacing microfield donors |
JPS6015069B2 (ja) * | 1977-03-14 | 1985-04-17 | 富士写真フイルム株式会社 | 現像装置 |
JPS5485036A (en) * | 1977-12-20 | 1979-07-06 | Ricoh Co Ltd | Developing device of electrostatic latent images |
JPS5614260A (en) * | 1979-07-16 | 1981-02-12 | Canon Inc | Developing device |
JPS5640860A (en) * | 1979-09-11 | 1981-04-17 | Canon Inc | Developing device |
DE3107055A1 (de) * | 1980-03-04 | 1982-01-07 | Canon K.K., Tokyo | "entwicklungsvorrichtung" |
JPS5868758A (ja) * | 1981-10-20 | 1983-04-23 | Konishiroku Photo Ind Co Ltd | 静電像現像方法 |
JPS59100470A (ja) * | 1982-12-01 | 1984-06-09 | Fuji Xerox Co Ltd | 現像器の現像剤規制装置 |
JPS60196785A (ja) * | 1984-03-21 | 1985-10-05 | Fuji Xerox Co Ltd | 一成分系現像装置 |
GB2186818B (en) * | 1986-02-20 | 1990-07-11 | Ricoh Kk | Developing electrostatic latent images |
US5017967A (en) * | 1988-04-13 | 1991-05-21 | Seiko Epson Corporation | Method and apparatus for forming images including a toner transporting member having an insulating layer |
US5168312A (en) * | 1989-10-16 | 1992-12-01 | Ricoh Company, Ltd. | Unit for developing electrostatic latent images including member having overcoat layer |
US5170213A (en) * | 1990-03-26 | 1992-12-08 | Japan Imaging System, Inc. | Developer unit utilizing a non-magnetic single component developer |
CA2049742A1 (en) * | 1990-10-22 | 1992-04-23 | Michael D. Thompson | Development apparatus |
JPH05232792A (ja) * | 1992-02-20 | 1993-09-10 | Canon Inc | 現像装置 |
DE69332495T2 (de) * | 1992-09-09 | 2003-07-03 | Toshiba Kawasaki Kk | Entwicklungsgerät |
US5628043A (en) * | 1993-09-20 | 1997-05-06 | Fujitsu Limited | Image forming apparatus |
KR960001929A (ko) * | 1994-06-30 | 1996-01-26 | 김광호 | 전자 사진 현상 장치 |
JPH08220884A (ja) * | 1995-02-14 | 1996-08-30 | Nec Corp | 現像装置 |
JPH08328381A (ja) * | 1995-06-02 | 1996-12-13 | Canon Inc | 弾性ブレード及び現像装置 |
US5899608A (en) * | 1998-03-09 | 1999-05-04 | Xerox Corporation | Ion charging development system to deliver toner with low adhesion |
-
1998
- 1998-04-30 DE DE19819390A patent/DE19819390A1/de not_active Withdrawn
- 1998-07-02 CN CNB988067595A patent/CN1133905C/zh not_active Expired - Fee Related
- 1998-07-02 WO PCT/DE1998/001827 patent/WO1999001799A2/de active IP Right Grant
- 1998-07-02 AU AU89722/98A patent/AU747535B2/en not_active Ceased
- 1998-07-02 JP JP18732198A patent/JPH1173013A/ja active Pending
- 1998-07-02 CA CA002295906A patent/CA2295906A1/en not_active Abandoned
- 1998-07-02 EP EP98941261A patent/EP0993628A2/de not_active Withdrawn
- 1998-07-06 US US09/110,924 patent/US6055402A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9901799A2 * |
Also Published As
Publication number | Publication date |
---|---|
US6055402A (en) | 2000-04-25 |
DE19819390A1 (de) | 1999-01-07 |
WO1999001799A2 (de) | 1999-01-14 |
CN1133905C (zh) | 2004-01-07 |
JPH1173013A (ja) | 1999-03-16 |
CA2295906A1 (en) | 1999-01-14 |
CN1261963A (zh) | 2000-08-02 |
AU747535B2 (en) | 2002-05-16 |
WO1999001799A3 (de) | 1999-03-25 |
AU8972298A (en) | 1999-01-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE102005055156B3 (de) | Vorrichtung und Verfahren zur Entwicklung von auf einem Zwischenbildträger erzeugten Potentialbilder bei einer elektrografischen Druck- oder Kopiereinrichtung | |
DE3206815C2 (de) | ||
DE1546739C3 (de) | Vorrichtung zum elektrostatischen Bedrucken einer Unterlage | |
DE3411948C2 (de) | ||
DE3329497C2 (de) | ||
DE69022090T2 (de) | Bilderzeugungsgerät. | |
DE2210337C3 (de) | Vorrichtung zur Entwicklung von elektrostatischen Ladungsbildern | |
DE3301796C2 (de) | Vorrichtung zur Entfernung des Entwicklers von einer photoleitfähigen Fläche | |
DE2839178A1 (de) | Entwicklungseinrichtung fuer ladungsbilder | |
DE2842516B2 (de) | Entwicklungseinrichtung für ein elektrophotographisches Kopiergerät | |
EP1825334A1 (de) | Elektrografische druck- oder kopiervorrichtung sowie verfahren zum betreiben der druck- oder kopiervorrichtung | |
DE69218710T2 (de) | Abgabewalze aus Phenolharz und Graphit | |
WO2003036393A2 (de) | Verfahren und vorrichtung zur reinigung von trägerelementen in druckern oder kopierern unter anwendung von magnetfeldern | |
DE3726725C2 (de) | ||
DE69015059T2 (de) | Vorrichtung zur Aussonderung von falsch geladenem Toner bei einem direkten elektrostatischen Druckgerät. | |
DE2033152A1 (de) | Vorrichtung zur EntWickelung eines latenten elektrostatischen Bildes | |
DE3129735C2 (de) | Bildaufzeichnungsgerät | |
DE3436775A1 (de) | Entwicklertraeger und verfahren zu dessen herstellung | |
DE3331428C2 (de) | Verfahren und Vorrichtung zum Ausbilden einer Schicht nichtmagnetischer Entwicklerteilchen | |
EP1747501B1 (de) | Verfahren und anordnung zum einfärben eines applikatorelements eines elektrofotografischen druckers oder kopierers | |
DE4446982B4 (de) | Elektrophotographisches Entwicklungsgerät | |
WO1999001799A2 (de) | Einkomponenten-entwicklungsstation | |
EP0946907B1 (de) | Verfahren zum betreiben eines elektrografischen druckers oder kopierers mit mindestens zwei entwicklereinheiten | |
DE69106151T2 (de) | Verfahren und Gerät zum Wiederaufbereiten von Tintenblättern. | |
DE19745561A1 (de) | Vorrichtung zur Verbesserung der Druckqualität einer Bildaufzeichnungsvorrichtung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20000131 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT CH DE GB LI NL |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHOENFELD, CARSTEN Inventor name: FRASER, KENNETH, D. Inventor name: CORMIER, STEVE Inventor name: BARISCHER, GERHARD Inventor name: ANGST, UWE Inventor name: RODI, ANTON |
|
19A | Proceedings stayed before grant |
Effective date: 20010116 |
|
19F | Resumption of proceedings before grant (after stay of proceedings) |
Effective date: 20011105 |
|
19F | Resumption of proceedings before grant (after stay of proceedings) |
Effective date: 20061002 |
|
19A | Proceedings stayed before grant |
Effective date: 20011022 |
|
19F | Resumption of proceedings before grant (after stay of proceedings) |
Effective date: 20061031 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HEIDELBERGER DRUCKMASCHINEN AKTIENGESELLSCHAFT Owner name: RODI, ANTON |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HEIDELBERGER DRUCKMASCHINEN AKTIENGESELLSCHAFT Owner name: RODI, ANTON |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HEIDELBERGER DRUCKMASCHINEN AKTIENGESELLSCHAFT Owner name: RODI, ANTON |
|
17Q | First examination report despatched |
Effective date: 20080701 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20110804 |