EP0634706A1 - Elektrostatographisches Gerät - Google Patents

Elektrostatographisches Gerät Download PDF

Info

Publication number
EP0634706A1
EP0634706A1 EP94201776A EP94201776A EP0634706A1 EP 0634706 A1 EP0634706 A1 EP 0634706A1 EP 94201776 A EP94201776 A EP 94201776A EP 94201776 A EP94201776 A EP 94201776A EP 0634706 A1 EP0634706 A1 EP 0634706A1
Authority
EP
European Patent Office
Prior art keywords
developer
container
toner
electrostatographic apparatus
funnel
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
EP94201776A
Other languages
English (en)
French (fr)
Other versions
EP0634706B1 (de
Inventor
Leo C/O Agfa-Gevaert N.V. Vackier
Serge C/O Agfa-Gevaert N.V. Tavernier
Luc C/O Agfa-Gevaert N.V. Van Goethem
Robert C/O Agfa-Gevaert N.V. Janssens
Dirk C/O Agfa-Gevaert N.V. Broddin
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.)
Agfa Gevaert NV
Original Assignee
Agfa Gevaert NV
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 Agfa Gevaert NV filed Critical Agfa Gevaert NV
Publication of EP0634706A1 publication Critical patent/EP0634706A1/de
Application granted granted Critical
Publication of EP0634706B1 publication Critical patent/EP0634706B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G03G15/0896—Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894
    • 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
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0167—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member
    • G03G2215/0174—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member plural rotations of recording member to produce multicoloured copy
    • G03G2215/0177—Rotating set of developing units

Definitions

  • This invention is applied in the field of electrostatography, more specifically upon mixing an electrostatographic developer containing toner particles and carrier particles.
  • a latent image is formed by (i) applying an imagewise charge distribution to a dielectric, (ii) developing the latent image, i.e. converting it in a visible image by depositing thereon selectively light-absorbing particles, called toner particles.
  • the toner particles are mostly electrically charged.
  • the image, made visible by the deposition of toner particles on the latent image that was present on the dielectric, is then transferred to a substratum and fixed thereon to yield the final copy.
  • the dielectric is a photoconductor and an image is formed by (i) uniformly charging a photoconductor, (ii) imagewise discharging it so as to obtain a latent image, (iii) developing the latent image, i.e. converting it in a visible image by depositing toner particles on the latent image.
  • the image made visible by the deposition of toner particles on the latent image that was present on the photoconductor, is then transferred to a substratum and fixed thereon so as to yield the final copy.
  • dry-powder For the application of toner development two methods are known : “dry-powder” and “liquid-dispersion” development. At present the dry-powder method is the most commonly used. More details on the dry-powder development can be found a.o. in IEEE Transactions on Electronic Devices, Vol. ED-19, no. 4, April 1972, pp. 495-511.
  • the toner particles are charged triboelectrically by mixing them, viz. shaking them together with the carrier particles (toner- and carrier particles have an opposite charge).
  • the mixture of carrier particles and toner particles, that are attracted electrostatically by the carrier particles, is the developer.
  • toner particles are released by the carrier particles and deposited on the latent image that has been applied to a dielectric.
  • the toner particles are thus the consumable in the developer. This implies that the developer gets exhausted upon being used, i.e. very few toner particles are left in the mixture with the carrier particles.
  • toner has to be added. This fresh toner particles are still uncharged and have to be mixed (shaken) again in the apparatus with the carrier particles for charging them triboelectrically.
  • Another object of the present invention is to realise a system that enables one to mix the fresh toner and the exhausted developer in such a way that the toner- and carrier particles do not agglomerate and that all toner particles are treated identically in their contact with de carrier particles so that all toner particles obtain practically the same charge.
  • Still another object of the invention is to provide an installation with which it is possible to spread the mixed developer over the entire working width of the magnetic brush so that in every point of it enough developer is present for making possible a faultless development of the electrostatic image.
  • an electrostatographic apparatus comprising a developing device or a plurality of developing devices, intended for being used in a development system with a dry powder developer comprising at least toner- and carrier particles, that comprise(s) a container for the developer wherein fresh toner can be mixed with said developer, as well as a container for fresh toner, characterised thereby that
  • the container for developer is arranged so as to rotate round a shaft, and at least one wall of said container is provided inside with ribs.
  • At least two adjacent ribs converge, viewed in the direction of rotation of said developing device, such as to form a substantially funnel-shaped channel with a relatively large entry opening and a relatively narrow exit opening, each of said converging ribs forming an angle of 70 to 30° with the normal through said entry- and exit openings.
  • Figure 1 is a cross-section of a possible embodiment of a developing device according to the present invention.
  • Figure 2 is a cross-section of another possible embodiment of a developing device according to the present invention.
  • Figure 3 is a front view of a developing device according to the present invention, wherein the container for the developer incorporates a body that functions as a container for the toner and wherein the outer wall of said body carries a funnel-shaped channel. For clarity's sake it is assumed that the wall of said container is transparent.
  • Figure 4 is a same view as represented in figure 3, with the difference that the outer wall of said body carries several funnel-shaped channels.
  • Figure 5 is a cross-section through a possible arrangement of 4 developing devices according to the present invention besides the photoconductor.
  • Figure 6 is a cross-section through another possible arrangement of 4 developing devices according to the present invention besides the photoconductor.
  • Figure 7 is a cross-section through a set-up of developing devices according to the present invention arranged around the photoconductor and rotating eccentrically around it.
  • Figure 8 is a cross-section through a set-up of developing devices according to the present invention arranged besides the photoconductor and wherein the mixing process of the developer is assisted by a magnetic field excited by a magnet that has been mounted concentrically with respect to the developing devices.
  • Figure 9 is a cross-section through another possible set-up of developing devices according to the present invention arranged besides the photoconductor and wherein the mixing process of the developer is assisted by a magnetic field excited by a magnet that has been mounted concentrically with respect to the developing devices.
  • Figure 10 is een cross-section through a possible set-up of developing devices according to the present invention arranged besides the photoconductor and wherein the mixing process of the developer is assisted by a magnetic field excited by a magnet that has been mounted besides the developing devices.
  • the container for fresh toner can be fixed separately from the container for developer in the electrostatographic apparatus and said container for developer is arranged so as to connect with the container for fresh toner in only one determined angular position.
  • the container(s) for the developer according to the present invention is (are) preferably directly connected to a container for fresh toner.
  • FIGS 1 and 2 possible embodiments are represented.
  • 11 is the container for the developer (mixture of toner and carrier)
  • 12 is the wall of said container
  • 13 are the ribs mounted on the inner side of the wall of said container
  • 14 is an optional partition placed in said container
  • 15 is the magnetic brush with which the toner is applied to the latent image
  • 16 is the container for fresh toner
  • 17 is the opening in the wall of the latter container through which fresh toner can come in the container for developer.
  • At least two adjacent ribs converge, viewed in the direction of rotation of said developing device, such as to form a substantially funnel-shaped channel with a relatively large entry opening and a relatively narrow exit opening, each of said converging ribs forming an angle of 70 to 30° with the normal through said entry- and exit openings.
  • one or more partitions 14 have been built in that are provided with ribs, analogous to the ribs 13 on the wall(s) of said container. From said ribs on said partition, at least two adjacent ribs converge, viewed in the direction of rotation of said developing device, such as to form a substantially funnel-shaped channel with a relatively large entry opening and a relatively narrow exit opening, each of said converging ribs forming an angle of 70 to 30° with the normal through said entry- and exit openings.
  • 21 is the container for developer
  • 22 is the wall of this container
  • 23 are the ribs mounted on the inner side of the wall of said container
  • 24 is an optional partition placed in said container and forming a quadrilateral in this specific embodiment
  • 25 is the magnetic brush with which the toner is applied to the latent image
  • 26 is the container for fresh toner
  • 27 is a partition placed in the latter container
  • 28 are ribs mounted on the inner side of the wall of said container
  • 29 is a common wall between the container for the developer and the container for fresh toner.
  • At least two adjacent ribs converge, viewed in the direction of rotation of said developing device, such as to form a substantially funnel-shaped channel with a relatively large entry opening and a relatively narrow exit opening, each of said converging ribs forming an angle of 70 to 30° with the normal through said entry- and exit openings.
  • partition 24 that has been built in, can be provided with ribs, analogous to the ribs 23 on the wall(s) of said container 21. From said ribs on said partition, at least two adjacent ribs converge, viewed in the direction of rotation of said developing device, such as to form a substantially funnel-shaped channel with a relatively large entry opening and a relatively narrow exit opening, each of said converging ribs forming an angle of 70 to 30° with the normal through said entry- and exit openings.
  • the container for fresh toner and the container for developer are composed as follows: in said container for developer
  • the ribs converging in pairs when viewed according to the rotation of the container so that they form a generally funnel-shaped channel may be arranged as shown in figure 3.
  • a rectangular internal body is represented in this figure and the outer walls of the container of the developer are transparent, so that one looks frontally on the ribs converging in pairs.
  • the ribs 31 mounted on a plane 35 form with the normal through the top-and bottom opening an angle ⁇ (32) that is smaller than ⁇ ° (whose value is described below).
  • the entry opening 33 is as large as the width of the outside wall of the internal body and smaller than the working width of the magnetic brush, said working width depending on the size of the paper on which the electrostatic image will be fixed.
  • the exit opening 34 is at least 25 times smaller than the entry opening and at most 40 times smaller.
  • the developer is led through successive funnel-shaped channels that mest the above-mentioned demands with respect to the angle between the normal through the entry opening and the exit opening and to the ratio between the sizes of the feed-and exit openings.
  • a first funnel-shaped channel 41 occupies one fourth part of the height of said wall(s), whereas said funnel-shaped channel 41 has a entry opening 43 which is as large as the width of the outside wall of the internal body and smaller than the working width of the magnetic brush.
  • funnel-shaped channels 42 Under the exit opening 44 of said funnel-shaped channel 41 there are two funnel-shaped channels 42 which have a entry opening 46 equal to half the width of the outside wall of the internal body and that connect to each other in such a way that the point of connection 47 is placed exactly in the centre of the exit opening 44 of the above-mentioned funnel-shaped channel 41.
  • the developer has to meet powder-rheological as well as magnetic and triboelectrical demands.
  • angle ⁇ (figure 3, 32) has to be chosen with respect to the rheological properties of the developer.
  • a developer is used consisting of at least two components, viz. electroscopic toner particles and carrier particles against which the above-mentioned toner particles are charged triboelectrically and which as magnetic particles on the magnetic brush realise the magnetic pulse.
  • Suchlike developer has to achieve a real flow and possesses an angle of repose ⁇ as small as possible.
  • This angle of repose ⁇ can be measured as follows: 300 g of developer (i.e. a mixture of carrier- and toner particles, and optionally other particles) are allowed to flow through a funnel on a sheet of paper. The extreme limits of the flow cone of the developer are marked and the height h of this flow cone is measured with a slide caliper. After the developer has been eliminated from the paper sheet, the diameter of the base of the flow cone is measured in 4 places. The average of these 4 values is the diameter d of the base of the flow cone.
  • the angle of repose ⁇ is calculated from: The developer for being used in a developing device according to the present invention will have an angle of repose ⁇ smaller than 40°, preferably smaller than 30°. In the best embodiment the angle of repose is smaller than 20°.
  • the angle ⁇ (see figure 3, 32) formed by the ribs 31 mounted on a plane 35 with the normal through the top- and bottom opening should be smaller than 90° - ⁇ .
  • the developer for being used in a developing device according to the present invention has to possess a spontaneous flow.
  • This flow is measured by placing 300 g of developer on the basis of a ferrite carrier in a cylindrical funnel of 140 mm height and 50 mm inside diameter, at 80.2 mm from the top that has been provided with sloping faces that form an angle of 30° with the normal between the top opening and the exit opening, and a exit opening with 20.8 mm length and 4 mm diameter, and to measure how rapidly all developer has flown away.
  • a developer on the basis of a composite carrier only 200 g of developer are placed in the funnel.
  • the speed of delivery is expressed in s/500 g.
  • the spontaneous flow of a developer for being used in a developing device according to the present invention should be smaller than 200 s/500 g, preferably smaller than 100 s/500 g.
  • the angle of repose ⁇ and the flow of the developer can be adjusted by adding other components to the mixture of carrier particles and toner particles.
  • interesting materials are, e.g., additives known as flow-improving or fluidising agents such as silica, alumina or TiO2, as has been described, e.g. in US-P 3,720,617, EP 0 460 665 and WO 91/00548.
  • small organic particles such as described, e.g., in US-P 5,041,351, can be mixed separately or together with inorganic flow-improving agents with the carrier- and toner particles in order to achieve the desired angle of repose.
  • small particles When small particles are added to the developer for being used in a developing device according to this invention, they should have an average diameter d a that is smaller than the mean diameter d t of the toner particles. Also the addition of large particles to the developer, as described in WO 92/18908, can be advantageous. Suchlike large particles, admixed as an additive, should have an average diameter d a that is larger than the mean diameter of the toner particles and smaller than 100 times the average diameter of the carrier particles d c . Preferably d a ⁇ d t , wherein d t is the volume-average diameter of the toner particles.
  • carrier particles can be used for composing a developer to be applied in a developing device as meant in the present invention.
  • the carrier particles can be made of metal (e.g. Fe, Ni), metal oxides (e.g. ferrites or magnetites) or can be composite particles consisting of small ( ⁇ 1 ⁇ m) particles of the above-mentioned materials (metals and/or metal oxides) in a binder (e.g. a polymer, glass, etc.). It is possible in the developer to be applied in a developing device according to this invention to use carrier particles that contain a mixture of magnetic pigments having different magnetic properties as described in the not yet published European Patent Application 93200285, filed 4th February 1993.
  • a mixture of carrier particles possessing different magnetic properties can be applied successfully in a developer to be used in a developing device according to the present invention.
  • the dimensions of the carrier particles have to be adapted to those of the toner particles to be used and lie between twice those of the toner particles as far as the flow properties are concerned, and 20 times the size of the toner particles as far as the requirements of quality are concerned.
  • the dimensions of the carrier particles lie between 2 times and 20 times those (volume average diameter) d t of the toner particles, most preferred are carrier particles with volume-average diameter between 3 and 10 times those of the toner particles.
  • the most preferred carrier particles are those described in the not yet published European Patent Application 93201795, filed 22nd June 1993.
  • the toner particles that together with the carrier particles and optional other additives constitute the developer to be used in a developing device according to the present invention should have an average (volumetric) diameter smaller than 15 ⁇ m, preferably still smaller than 12 ⁇ m, and most preferably smaller than 10 ⁇ m.
  • the toner particles may contain a.o. a binder, dyes, charge-controlling agents, inorganic fillers, as is known to those skilled in the art of toner preparation. Compositions of the toner particles to be used in the present invention have been described, e.g., in the unpublished European Patent Applications 93201351 filed 11th May 1993, 93201647 filed 9th June 1993, and 93201815 filed 22nd June 1993.
  • the developer according to this invention may incorporate still other additional components, e.g., the above-mentioned flow-improving agent, beads with special magnetic properties, large beads as spacing agents, such as described in WO 92/18908, so that a three- or multi-component developer forms.
  • the admixtures can take place with substances or particles that are not intended to come in the magnetic brush, as well as with substances and/or particles that are intended to do so.
  • the developing devices according to the present invention can be used for negative/positively working developers as well as for positive/positively working developers.
  • developing units as described above can be provided for each of the four colours yellow, magenta, cyan and black. It is also possible to built in more than four developing units, e.g. a developing device according to the present invention for applying a colourless toner, an additional extra large developing device for using the apparatus as black-and-white copier, etc.
  • the developing devices according to the present invention can be arranged in a (colour) copier in different ways around the photoconductor.
  • colour colour copier
  • FIG. 5 An example of a possible arrangement is represented in figure 5.
  • a shaft 51 four developing units as shown in figure 1 are arranged.
  • this figure 58 is the photoconductor, 55 the magnetic brush, 56 the opening through which fresh toner from the container for fresh toner enters the container for developer.
  • the container for toner 53 has been placed besides the container for developer 54.
  • the latter container there is a partition 52, and the inside walls of said container have ribs 57, according to the present invention.
  • the circle over which the four developing units are moving has been divided in four quadrants, in the first of which the magnetic brush faces the photoconductor.
  • Each of the four different developing devices represented in figure 5 moves clockwise during copying around a shaft and comes in all four positions in the respective quadrants.
  • the whole rotates again around shaft 51, and the developing device for the first colour comes in quadrant III.
  • the ribs on the inside of the container for theveloper at one side shovel developer with fresh toner, and on the opposite side used developer falls down.
  • Partition 52 divides the developer falling down.
  • the whole rotates another time, and the developing device for the first colour comes in quadrant IV.
  • the developer with fresh toner falls on top of the other, non-replenished developer, and is divided by partition 52.
  • the ribs shovel another part of the developer.
  • the whole is rotated again around shaft 51, and again a portion of developer falls down and is divided by the partition 52. In this way fresh developer is available on the magnetic brush.
  • FIG 6 an example of a possible practical set-up of a developing device in a four-colour copier is represented, the container for the developer of which contains a body whose outside wall runs substantially parallel to the inside wall of said container for developer (called “internal body” further on) so that an annular space is determined for containing the developer and said inside body is the container for fresh toner, and the outside wall of said internal body carries ribs that converge in pairs when viewed according to the rotation of the container, so that they form a substantially funnel-shaped channel with a relatively large entry opening and a relatively narrow exit opening.
  • 63 is the photoconductor
  • 65 the magnetic brush
  • 64 the shaft around which the four developing devices rotate
  • 61 the annular space created by building in in the container for developer the inside body 62 being the container for fresh toner
  • 66 is the dosing opening for fresh toner
  • 67 are the ribs on the inside wall of the container for developer. The ribs converging in pairs when viewed according to the rotation of the container so that they form a substantially funnel-shaped channel, have been mounted on the outside walls 68 and 69 of the inside body.
  • the developing devices according to the present invention need not have the same dimensions; it is possible to shape the container for this toner that is being consumed in larger quantities larger than the container for toner that is being consumed in smaller quantities.
  • the benefit of setting up the developing units in an eccentric ring around the photoconductor is that in this way the developing device shields the rather vulnerable photoconductor against the neighbourhood.
  • the carrier particles When it is tried to amplify the action of mixing on the basis of gravity, this can be done without contact by admixing through a magnetic field the developer, that is magnetic via the carrier particles.
  • the carrier particles it is preferred for the carrier particles to have a saturation magnetisation (M sat ) so that M sat ⁇ 0.3 T (Tesla).
  • This external magnetic field can be excited by any means known to those skilled in the art.
  • the magnetic field can be stationary or oscillating.
  • Quadrant I where the toner is being applied to the photoconductor is the quadrant at the left below.
  • a magnet 81 and four or more developing units can rotate independently of one another. The magnet rotates counterclockwise and the four developing units rotate clockwise.
  • the developing units consist of a body, wherein an inside body 88 has been built in so that an annular space forms that contains the developer.
  • the annular space can be subdivided in three compartments: 85a and 85b around the magnetic brush 84, and 85c.
  • the outside of said inside body 88 carries ribs that converge in pairs, when viewed according to the rotation of the container, so that they form a substantially funnel-shaped channel with a relatively large entry opening and a relatively narrow exit opening (86).
  • the developing unit When the developing unit is in quadrant I, at left below, all developer is in space 85a.
  • the magnetic roller (magnetic brush) is provided with the necessary developer, toner is being transferred to the photoconductor 89, and the finished developer lands in space 85b.
  • the developing units rotate and the developing unit leaves quadrant I and enters quadrant II.
  • the finished developer remains in space 85a and the fresh developer in space 85b.
  • the developing units continue rotating and the developing unit that has applied the first colour comes in quadrant III.
  • the finished developer falls from space 85b in space 85c and the fresh developer falls through the funnel-shaped opening 86 from space 85a in space 85c.
  • Magnet 81 rotates then counterclockwise at 1 to 4 Herz and carries along developer as high as the turning point 85d. Then the developer falls down again, the magnet carries the developer back to turning point 85d, the developer falls down, etc.
  • the partition 87 retains an amount of fresh toner that is being brought in quadrant III through an opening in the annular space, which contains the developer.
  • the developing units continue rotating and the developing unit that contains the first colour is in quadrant IV.
  • this quadrant already part of the developer falls from space 85c through the funnel-shaped openings 86 in space 85a.
  • quadrant IV Upon passing from quadrant IV to quadrant I, all the developer in space 85c falls through the funnel-shaped opening 86 in space 85a and is ready for use.
  • Figure 9 represents a possible other embodiment (for simplicity's sake the ribs on the inside of the container for developer as described above have not been drawn) : 91 is a cross-shaped magnet rotating counterclockwise around a shaft 93 that is concentric with shaft 92, around which are rotating clockwise developing devices according to the present invention.
  • the container for toner 95 is large with respect to the container for developer 94.
  • FIG 10 a possible set-up of the developing devices is shown, wherein mixing occurs under the influence of both gravity and magnetism, but wherein the mixing magnet 101 has been mounted besides the set-ups of the developing devices on a separate shaft 102 (for simplicity's sake the ribs on the inside of the container for developer as described above have not been drawn).
  • the developing devices have been arranged around shaft 103.
  • quadrant I magnetic brush 108 and photoconductor 109 are in one another's neighbourhood.
  • the container for toner 105 has been mounted besides the container for developer 104.
  • three spaces 104a, 104b, and 104c are to be distinguished.
  • a partition 106 has been placed that carries ribs that converge in pairs when viewed according to the rotation of the container, so that they form a substantially funnel-shaped channel 107 with a relatively large entry opening and a relatively narrow exit opening.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
EP19940201776 1993-07-12 1994-06-22 Elektrostatographisches Gerät Expired - Lifetime EP0634706B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9300714A BE1007265A4 (nl) 1993-07-12 1993-07-12 Een electrostatografische ontwikkelinrichting.
BE9300714 1993-07-12

Publications (2)

Publication Number Publication Date
EP0634706A1 true EP0634706A1 (de) 1995-01-18
EP0634706B1 EP0634706B1 (de) 1997-11-05

Family

ID=3887171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940201776 Expired - Lifetime EP0634706B1 (de) 1993-07-12 1994-06-22 Elektrostatographisches Gerät

Country Status (3)

Country Link
EP (1) EP0634706B1 (de)
BE (1) BE1007265A4 (de)
DE (1) DE69406603T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0807869A1 (de) * 1996-05-17 1997-11-19 Agfa-Gevaert N.V. Elektrostatographisches Entwicklungsgerät

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3208996A1 (de) * 1982-03-12 1983-09-22 Agfa-Gevaert Ag, 5090 Leverkusen Entwicklungseinrichtung fuer elektrofotografische kopiergeraete
US4598991A (en) * 1983-03-31 1986-07-08 Tokyo Shibaura Denki Kabushiki Kaisha Developing device
JPS61259282A (ja) * 1985-05-14 1986-11-17 Canon Inc 現像装置
DE4017457A1 (de) * 1989-05-31 1990-12-06 Minolta Camera Kk Entwicklerzufuhrvorrichtung
JPH03164766A (ja) * 1989-11-24 1991-07-16 Hitachi Koki Co Ltd 現像剤攪拌装置
WO1991014210A1 (en) * 1990-03-12 1991-09-19 Universal Developer And Manufacturing Co. Toner dispenser for xerographic machines
EP0452897A2 (de) * 1990-04-18 1991-10-23 Matsushita Electric Industrial Co., Ltd. Entwicklungsgerät
DE4139428A1 (de) * 1990-11-30 1992-06-04 Ricoh Kk Bilderzeugungseinrichtung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3208996A1 (de) * 1982-03-12 1983-09-22 Agfa-Gevaert Ag, 5090 Leverkusen Entwicklungseinrichtung fuer elektrofotografische kopiergeraete
US4598991A (en) * 1983-03-31 1986-07-08 Tokyo Shibaura Denki Kabushiki Kaisha Developing device
JPS61259282A (ja) * 1985-05-14 1986-11-17 Canon Inc 現像装置
DE4017457A1 (de) * 1989-05-31 1990-12-06 Minolta Camera Kk Entwicklerzufuhrvorrichtung
JPH03164766A (ja) * 1989-11-24 1991-07-16 Hitachi Koki Co Ltd 現像剤攪拌装置
WO1991014210A1 (en) * 1990-03-12 1991-09-19 Universal Developer And Manufacturing Co. Toner dispenser for xerographic machines
EP0452897A2 (de) * 1990-04-18 1991-10-23 Matsushita Electric Industrial Co., Ltd. Entwicklungsgerät
DE4139428A1 (de) * 1990-11-30 1992-06-04 Ricoh Kk Bilderzeugungseinrichtung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 112 (P - 565)<2559> 9 April 1987 (1987-04-09) *
PATENT ABSTRACTS OF JAPAN vol. 15, no. 406 (P - 1263) 16 October 1991 (1991-10-16) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0807869A1 (de) * 1996-05-17 1997-11-19 Agfa-Gevaert N.V. Elektrostatographisches Entwicklungsgerät

Also Published As

Publication number Publication date
BE1007265A4 (nl) 1995-05-02
DE69406603D1 (de) 1997-12-11
EP0634706B1 (de) 1997-11-05
DE69406603T2 (de) 1998-06-18

Similar Documents

Publication Publication Date Title
US6096466A (en) Developer and developing method
US20140205326A1 (en) Developing device and image forming apparatus
JP2003533742A (ja) エレクトログラフ現像剤組成物および方法
JPS6249377A (ja) マルチカラ−画像形成装置
US4837100A (en) Electrophotographic developer containing positively chargeable toner
EP0634706B1 (de) Elektrostatographisches Gerät
US5617189A (en) Developing unit for thoroughly supplying mixed toner in an electrostatographic printer
JPS61118761A (ja) 二色電子プリンタ用トナ−
JP3366969B2 (ja) 画像形成装置及び画像形成方法
JPS6139067A (ja) ２色画像形成装置
EP0769727A1 (de) Toner zur vielfarbigen Bilderzeugung, Entwicklerzusammensetzung und Mehrfarbenbildherstellungsverfahren
US20140205327A1 (en) Developing device and image forming apparatus
JPS59218458A (ja) 静電荷像用現像剤
JPH0123779B2 (de)
JP2503221B2 (ja) 静電荷像用現像剤
JP3475733B2 (ja) 電子写真用二成分系現像剤を用いた画像形成方法
EP0671669B1 (de) Entwicklungseinheit für die Verwendung in einem elektrostatographischen Druckgerät
JPH03242656A (ja) 白色現像剤
US6365310B1 (en) Developing method and a developer for electrophotography
JPH10319671A (ja) 静電荷像現像剤
JPS58127962A (ja) トナ−供給装置
JPS59218457A (ja) 静電荷像用現像剤
JPS59210450A (ja) 静電荷像用現像剤
JPH0429158A (ja) 二成分現像剤
JP2000089570A (ja) 現像装置

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB NL

17P Request for examination filed

Effective date: 19950718

D17P Request for examination filed (deleted)
R17P Request for examination filed (corrected)

Effective date: 19950718

17Q First examination report despatched

Effective date: 19961125

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19971105

REF Corresponds to:

Ref document number: 69406603

Country of ref document: DE

Date of ref document: 19971211

ET Fr: translation filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 19980601

REG Reference to a national code

Ref country code: FR

Ref legal event code: D6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990415

Year of fee payment: 6

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010403

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020606

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020628

Year of fee payment: 9

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030622

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20030622

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040227

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST