EP1438639A2 - Verfahren und vorrichtung zur reinigung von trägerelementen in druckern oder kopierern unter anwendung von magnetfeldern - Google Patents
Verfahren und vorrichtung zur reinigung von trägerelementen in druckern oder kopierern unter anwendung von magnetfeldernInfo
- Publication number
- EP1438639A2 EP1438639A2 EP02781287A EP02781287A EP1438639A2 EP 1438639 A2 EP1438639 A2 EP 1438639A2 EP 02781287 A EP02781287 A EP 02781287A EP 02781287 A EP02781287 A EP 02781287A EP 1438639 A2 EP1438639 A2 EP 1438639A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- magnetic
- particles
- carrier
- toner particles
- 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
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
- G03G21/0047—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using electrostatic or magnetic means; Details thereof, e.g. magnetic pole arrangement of magnetic devices
Definitions
- the invention relates to an electrophotographic printing or copying device in which a toner attachment unit deposits electrically charged toner particles on the surface of a first carrier element. At least part of the attached toner particles are transferred from the first carrier element to a second carrier element. A cleaning unit removes remaining toner particles from the first carrier element.
- Another aspect of the invention relates to a device for cleaning a roller of toner particles in an electrophotographic printer or copier, on the surface of which a particle mixture of electrically charged toner particles and ferromagnetic carrier particles is conveyed. Furthermore, methods for operating an electrophotographic printer or copier and for cleaning a roller in an electrophotographic printer or copier are specified.
- Image development methods used the electrostatic charge images on surfaces, e.g. Develop charge images on a photoconductor, over an air gap, or in direct contact with triboelectrically charged toner located on the surface of an applicator element.
- an applicator element can e.g. be designed as a roller or as an endless belt.
- the toner particles are triboelectrically charged prior to transfer to the applicator element.
- printers or copiers produce a two-component mixture of toner particles and ferromagnetic carrier particles. The two-component mixture is mixed in the printer or copier so that the toner particles rub against the carrier particles, as a result of which they are charged triboelectrically.
- a magnetic roller arrangement transports the two-component mixture into an area with a small distance between the magnetic roller arrangement and the surface to be colored, a magnetic field of a magnetic element acting on the two-component mixture.
- a magnetic brush is formed which contains carrier particles and toner particles, only the latter being transferred to the surface to be colored. The carrier particles are retained due to the magnetic field.
- the transfer of the toner particles from the magnetic roller arrangement to the applicator element takes place in other known printers or copiers via an air gap between the magnetic roller and the applicator element, which is not completely bridged by the accumulation of the two-component mixture.
- the transfer of the toner particles onto the applicator element surface can be carried out by means of an auxiliary transfer voltage, i.e. supported by a potential difference between the magnetic roller and the applicator element. During an image development process, the toner becomes one
- toner particles remain on the surface of the application element in the form of an image negative of the developed charge image.
- the toner particles remaining on the applicator element must be removed from the applicator element.
- the unprinted area of a printed page with text averages around 95% of the total area. Thus, when printing such an average print page, approximately 95% of the amount of toner particles deposited on the applicator element must be removed from it again. Depending on the type of print image to be inked remove 0 to 100% of the amount of toner particles from the applicator element.
- the cleaning of the applicator element with the aid of known cleaning devices is insufficient. After repeated accumulation of toner particles on the applicator element and after incomplete cleaning of the toner particles remaining on the applicator element after the latent charge image has been colored, these form an unevenly thick layer on the applicator element.
- the inhomogeneous toner layer of different thicknesses can cause print image disturbances, e.g. the so-called memory effect.
- the memory effect the previous print image is visible in colored areas of the print image as a result of the inhomogeneous toner layer on the applicator element, which is transferred as a print image to a medium to be printed. For high-quality printing, a complete removal of the remaining toner particles is therefore necessary before the toner is deposited again on the applicator element.
- An electrostatic copier is known from document US Pat. No. 4,141,165, in which magnetic brushes are used to color a charge image of a photoconductor drum and to remove residual toner from the photoconductor drum.
- a roller is used for application and cleaning, which contains stationary magnets inside. The magnetic brush is created with the help of the magnets. A mixture of particles is removed from the surface of the roller with the aid of doctor blades, the cutting edge of which scrapes on the surface of the roller.
- a magnetic brush cleaning device for a copier is known from document DE 32 46 940 A1. With the aid of a magnetic brush device, it is achieved that a mixture of a magnetic carrier and the toner glides smoothly over the surface of a photoconductor and decreases toner residues adhering to the photoconductor surface. The cleaned toner is fed by means of a toner recovery device which contains several rollers. On the reels of the
- Toner material adhering to the toner recovery device is removed from them with the aid of doctor blades scraping on these rollers.
- a magnetic brush cleaning device is known from document DE 32 41 819 C2, in which a cleaning roller is provided, in the interior of which stationary magnets are provided are that generate magnetic brushes.
- the magnetic brush sweeps over the surface of a photoconductor drum and cleans residual toner from it, which remains on the photoconductor drum after the printing of a toner image.
- the cleaned toner material is transferred from the magnetic roller to a second roller.
- the toner material is scraped off the surface of the second roller with the aid of a scraper which lies against the surface of the second roller.
- magnetic rollers which are used for coloring a charge image of a photoconductor drum and for cleaning residual toner from the photoconductor drum.
- Two abutting magnetic elements which are arranged opposite the surface of the photoconductor drum, prevent the contact of the magnetic brush with the surface of the photoconductor drum.
- the magnets of the magnetic roller rotate with the magnetic roller.
- Document DE 32 49 767 discloses a cleaning device for removing developer particles from an imaging surface of a movable, photoconductive belt in an electrophotographic copier. With the help of this cleaning device, the back of the belt is also cleaned of any toner residues and dust deposits.
- the belt is pressed against a cleaning roller with the help of a scraper.
- the scraper is pressed against the cleaning roller by means of a plate made of a magnetizable material by means of magnets arranged in the cleaning roller.
- Document DE 39 40 079 C2 discloses a method for removing a thin layer from a movable photoconductive part of an image forming device.
- toner material that is on a roller surface is removed with the aid of a scraper that scrapes the toner material off the roller surface.
- the object of the invention is to provide electrophotographic printing or copying devices and methods for operating electrophotographic printing or copying devices in which high print quality is achieved, with a low stress on the particle mixture of ferromagnetic carrier particles and electrically charged toner particles.
- devices and methods for cleaning a roller in an electrophotographic printer or copier are to be specified which ensure maintenance-free operation of the devices for cleaning.
- toner particles deposited on the surface of a roller of an electrophotographic printer or copier are reliably removed with little effort.
- two magnetic elements are arranged in a stationary manner, one pole of which is directed towards the roller surface, so that they act approximately in the same direction.
- the magnetic elements viewed in the direction of rotation of the roller, are arranged at a distance from one another in such a way that the carrier particles remain on the magnetic elements and form raised collections, so-called magnetic brushes, the carrier particles rubbing on the surface of the roller when the roller rotates.
- the cleaning device reliably removes the toner particles adhering to their surface and does not require any additional space in the electrophotographic printer or copier, since the magnetic elements are arranged inside the roller.
- the device works without wear and causes an additional triboelectric charging of the toner. Auxiliary energy is not required to operate the device. Furthermore, the device is suitable for various particle mixtures. see suitable from toner particles and carrier particles. Cleaning takes place reliably even when the physical properties of a particle mixture used in a printing or copying device change. With increasing service life, such changes occur due to mechanical
- the adjacent poles of the two magnetic elements facing the particle mixture are of the same type, i.e. the magnetic fields of these poles act approximately in the same direction, so that there is a low field strength between the magnetic elements on the roller surface.
- the field vectors of the magnetic fields have an opposite direction on the surface of the roller in this area, so that there is no resulting field strength with approximately identical magnetic elements.
- the particle mixture remains on the roller surface on the magnetic elements and forms raised collections, in which a rotating roller-shaped movement within the particle mixture is generated when the roller rotates. The particle mixture rubs off the toner particles adhering to the roller surface during this movement.
- the magnetic elements are arranged in such a way that at least some of the carrier particles in a partial area between the two magnetic elements are released from the roller surface by the magnetic fields of the magnetic elements acting on the carrier particles, the particle mixture in the area of the magnetic elements at one Rotational movement of the roller is swirled particularly well. It is thereby achieved that toner particles which are on the roller surface are detached from it and completely rubbed off, the mechanical stress on the particle mixture being low. The physical properties of the particle mixture remain the same. The toner particles deposited electrostatically on the outer circumferential surface of the roller can be removed particularly effectively in this embodiment.
- a doctor blade is arranged at a predetermined distance from the roller surface. It is advantageous to arrange the doctor blade in the direction of rotation of the roller after the first and second magnetic element in the vicinity of the second magnetic element. It is also advantageous to arrange the doctor blade in the lower half of the roller. The swirling of the particle mixture to rub off the toner particles from the surface of the roller and the separation of the particle mixture from the roller surface takes place effectively and with little design effort by arranging the doctor blade.
- the outer peripheral surface of the roller has a roughness in the range from 1 to 5000 ⁇ m.
- the roughness of the roller surface can be produced inexpensively by flame spraying with a high quality, a layer being produced which contains aluminum, chromium, nickel, copper, conductive plastic and / or a plastic with a conductive layer.
- a set potential can be applied to the surface of the roller, for example in order to support the transfer of toner particles to this roller or from this roller.
- Rollers and surfaces can also be produced easily and inexpensively from these materials. It has proven to be particularly advantageous to arrange the adjacent edges of the two magnetic elements at a distance in the range from 0.01 to 10 mm, since a particularly thorough cleaning takes place at this distance.
- this distance range depends on the field strength of the magnetic elements used, on the peripheral speed of the roller, on the particle mixture used, especially on the carrier particles used, and on the distance between the magnetic element and the outer peripheral surface of the roller.
- the cleaning device can be easily adapted to the operating conditions of the printer or copier by changing the distance between the magnetic elements and / or by using magnetic elements with different field strengths.
- the roller used in this cleaning device can contain further magnetic elements for producing particle collections, so-called magnetic brushes, which are raised on the roller surface.
- the magnetic elements are permanent magnets. This is particularly advantageous since, unlike electromagnets, no auxiliary energy is required for permanent magnets.
- a method according to the invention for cleaning a roller in an electrophotographic printer or copier ensures thorough and wear-free cleaning of the roller. No further additional units are required for cleaning, so that no additional space is required for the cleaning device for cleaning.
- the toner particles are also charged triboelectrically by the cleaning process. The roller is cleaned almost without wear.
- a second aspect of the invention relates to an electrophotographic printing or copying device and an inventive method for operating an electrophotographic printing or copying device.
- a first carrier element is dyed with toner, this carrier element subsequently being cleaned of toner residues with the aid of a roller arrangement of a cleaning unit.
- the toner residues are removed from this roller arrangement with the aid of a doctor-magnet element arrangement. This prevents toner particles from being permanently attached to the surface of the roller arrangement and forming a crust-like layer which hinders electrostatic effects and thus impairs the electrophotographic process.
- the electrophotographic printing or copying process can be carried out in high quality and at high speed in the device and method according to the invention.
- Such an electrophotographic printing or copying device can be manufactured inexpensively due to the simple, compact structure.
- a device for cleaning a roller in an electrophotographic printer or copier has a doctor blade, which is arranged at a distance from the surface of a roller, on the roller surface of which a particle mixture of ferromagnetic carrier particles and electrically charged toner particles is conveyed.
- a magnetic element is arranged statically in the area of the doctor blade, that is to say stationary with respect to the doctor blade, in the interior of the roller in such a way that the carrier particles in the region, viewed in the direction of rotation of the roller, form a raised area on the roller surface, ie a magnetic brush, in front of the doctor blade.
- the carrier particles of the accumulation rub against the surface of the roller when the roller rotates.
- the doctor blade strips off at least part of the partial mixture on the roller.
- the magnetic field of the magnetic element holds parts of the particle mixture stiffened by the doctor blade in the area in front of the doctor blade.
- the particle mixture is swirled in the area in front of the doctor blade by the rotary movement of the roller and by the fixed doctor blade. The result of this is that toner particles which are located directly on the roller surface are caused by the swirling of the particle mixture in the area of the doctor blade, especially by the swirling of the
- Carrier particles are mechanically rubbed off the surface of the roller.
- the rubbed-off toner particles are absorbed by the particle mixture in the area in front of the doctor blade.
- toner particles that are located directly on the surface of the roller are also detached from it and can thus be removed.
- the negative change in physical properties of the roller due to a crust-like layer of toner particles on the roller surface is thus prevented simply and inexpensively.
- a layer of toner particles on the roller surface has an electrical insulation effect and limits the effect of a potential difference between the roller surface and other elements, such as e.g. other rollers and belts of the printer or copier, or prevents this effect.
- Such potential differences are e.g. used to transfer electrically charged toner particles in printers or copiers.
- the particle mixture on the doctor blade can simply fall down.
- the removal of the particle mixture on the doctor blade is thus easily possible.
- the falling down mixture of particles can e.g. collected in a collecting container arranged under the roller or directly falling into a so-called mixture sump of the printer or copier, in which the two-component mixture is located, and then returned to the electrophotographic printing or copying process.
- the outer peripheral surface of the roller has a roughness in the range from 1 to 5000 ⁇ m. It is thereby achieved that the particle mixture to be transported on the roller surface has sufficient adhesion for the transport and that the particle mixture can be removed from the surface again with simple means. Additionally or alternatively, the roller surface can be profiled in order to reduce slippage of the particle mixture on the roller surface and to ensure a continuous transport of the particle mixture when the roller rotates.
- the surface of the roller using a flame spraying process.
- a surface of the roller with a suitable roughness can be produced simply and inexpensively. If the roller surface and / or at least a part of the rotating hollow roller made of aluminum, chromium, nickel, copper, conductive plastic and / or a plastic with a conductive layer, the surface of the roller can be exposed to a set potential, for example in order to to assist in transferring toner particles to or from this roller. Also can be Manufacture rollers from these materials easily and inexpensively.
- the distance between the doctor blade and the roller surface is set in the range from 0.05 to 6 mm. Such a distance ensures low wear of the doctor blade and roller and reliable cleaning of the roller from toner particles fixed on the roller surface.
- An inventive method for cleaning a roller in an electrophotographic printer or copier ensures that the roller is cleaned thoroughly with little effort. Additional auxiliary energy is not required for this. With the aid of the method, a compact design of the printer or copier is also possible, the method being able to be carried out almost without wear for the roller and for the doctor blade due to the distance between the doctor blade and the roller surface.
- This method of cleaning the roller can be used for various particle mixtures of toner particles and carrier particles. The cleaning effect of such an arrangement also remains when the physical properties of the particle mixture change.
- a fourth aspect of the invention relates to an electrophotographic printing or copying device in which a toner attachment unit deposits electrically charged toner particles on the surface of a first carrier element. At least part of the toner particles are transferred from the first carrier element to a second carrier element.
- a cleaning unit removes the toner particles remaining on the first carrier element after the transfer.
- the cleaning unit contains a roller which is arranged at a distance from the first carrier element.
- At least two magnetic elements are arranged in a stationary manner inside the roller.
- a particle mixed promoted which contains electrically charged toner particles and ferromagnetic carrier particles.
- the adjacent poles of the two magnetic elements facing the particle mixture are of the same type and, viewed in the direction of rotation of the roller, are arranged at a distance from one another in such a way that the carrier particles on the surface of the roller form at least one collection on the magnetic elements, the carrier particles of which on a rotation of the roller on its surface rub.
- the cleaning of the first carrier element and the roller arrangement used for cleaning ensures a high-quality print image even when the printing or copying device is in use for a long time, toner particles adhering to the surface of the roller from the particle mixture on the surface of the particle mixture by means of a magnetic element arrangement Roller are rubbed. This prevents toner particles from being permanently deposited on the surface of the roller, which hinders electrostatic processes and thus affects the electrographic process.
- the physical properties of the roller arrangement and the toner mixture can be kept constant over a long period of time by the device or the method.
- a doctor blade is arranged at a predetermined distance from the roller surface in the region of the second magnetic element or in the direction of rotation of the roller after the two magnetic elements.
- the roller-shaped movement within the particle mixture of carrier particles and toner particles in the area of the magnetic elements on the roller surface is reinforced by the doctor blade, with at least parts of the Toner particles that have settled on the roller surface are rubbed off and detached from it.
- a fifth aspect of the invention relates to an electrophotographic printing or copying device and a method for operating such an electrophotographic printing or copying device.
- the electrophotographic printing or copying device has a toner attachment unit which transfers toner particles to a first carrier element with the aid of a particle mixture of electrically charged toner particles and ferromagnetic carrier particles. After at least some of the toner particles of the particle mixture have been transferred to a second carrier element, the particle mixture is fed to a cleaning unit. With the aid of the particle mixture supplied, the cleaning unit picks up the toner particles present on the first carrier element.
- an applicator element is used as the first carrier element and a photoconductor is used as the second carrier element. This ensures that
- Applicator element is colored with toner particles with the aid of the toner attachment unit, a part of the toner particles being transferred from the applicator element to the photoconductor in accordance with the latent charge image located on the photoconductor and the toner particles remaining on the applicator element being removed therefrom.
- the combination of the applicator element and the photoconductor ensures a uniform layer thickness of the toner particles of the print image, as a result of which high-quality, homogeneous print images are produced with a uniform print intensity.
- the first carrier element is a photoconductor and the second carrier element is a carrier material to be printed or a transfer element.
- the photoconductor is colored with toner particles in accordance with its latent charge image, and the toner image is moved towards it printing carrier material or the transfer element is reprinted.
- the toner particles remaining on the photoconductor after the transfer printing are removed from the photoconductor with the aid of the cleaning unit. It is thereby achieved that the photoconductor is completely cleaned of toner particles after a printing or copying process before a further printing or copying process and memory effects in the subsequent print image are avoided.
- the direction of rotation of the roller is the same as the direction of rotation of the first carrier element.
- the cleaning effect is increased, since with the help of the roller more ferromagnetic carrier particles for receiving toner particles are guided past the first carrier element, which touch the surface of the first carrier element and remove the toner particles adhering to it.
- the carrier particles located on the surface thereof are rotated and thus transported in the circumferential direction by the rotary movement of the roller. A rough and / or structured roller surface favors this transport of the carrier particles.
- the axes of the poles of the magnetic element are aligned radially to the axis of rotation of the roller. It is thereby achieved that the magnetic field of the magnetic element exerts a particularly large force on the ferromagnetic carrier particles in the region in that the pole of the magnetic element facing the peripheral surface of the roller is at a short distance from the roller surface. This force aligns the carrier particles with the field lines of the magnetic element and at least partially temporarily holds them in this area, so that a concentration, a so-called magnetic brush, is formed by the concentration of the carrier particles and their alignment.
- the distance between the carrier element and the roller is preferred less than or equal to the height of the magnetic brush on the roller.
- the distance between the roller and the first carrier element is preferably set in the range between 0.1 and 7 mm.
- the amount of the ferromagnetic carrier particles conveyed on the surface of the roller can contain a predetermined proportion of toner particles, whereby a particle mixture of carrier particles and toner particles is used for cleaning the roller.
- particle mixtures of carrier particles and toner particles can also be used for cleaning, which previously e.g. have been used for coloring a carrier element.
- the toner attachment unit transfers toner particles of a two-component mixture of electrically charged toner particles and ferromagnetic carrier particles to the first carrier element. This two-component mixture is fed to the roller of the cleaning unit after at least some of the toner particles have been transferred to the first carrier element.
- the mixture of particles supplied to the cleaning unit takes those remaining on the first carrier element
- Toner particles The result of this is that the particle mixture only has to be processed once in the electrophotographic printing or copying device. It is used first for toner application and then for cleaning.
- the particle mixture is transferred from the clay depositing unit to the cleaning unit with the aid of a magnetic field from at least one magnetic element.
- the transfer of the particle mixture from the toner accumulation unit to the cleaning unit can be carried out with the aid of a between the toner accumulation unit and the cleaning unit arranged guide element.
- a guide element can be, for example, a guide plate or a conveyor device, such as a conveyor belt or a screw conveyor. This ensures that the particle mixture is continuously transferred from the toner accumulation unit to the cleaning unit.
- permanent magnets are used as magnetic elements, no supply energy is required for the magnetic elements. Furthermore, permanent magnets are inexpensive and can be produced in almost any shape.
- the side of the magnetic elements facing the surface of the roller can thereby e.g. be executed curved, so that the design of the roller assembly can be made even more compact. If several magnetic elements are arranged inside the roller, the poles of which are each aligned approximately radially to the axis of rotation, then several magnetic brushes can be formed on the surface of the roller with the aid of these magnetic elements. The transfer of toner and / or carrier particles can thus be carried out easily, inexpensively and without wear in the printing or copying device.
- a first potential difference is generated between the toner attachment unit and the first carrier element and / or a second potential difference is generated between the cleaning unit and the first carrier element.
- FIG. 1 shows an arrangement for depositing and removing toner on or from an applicator element surface, a particle mixture of ferromagnetic carrier particles and electrically charged toner particles being used for depositing and removing;
- FIG. 2 shows a further arrangement for depositing and removing toner, similar to the arrangement shown in FIG. 1;
- FIG. 3 shows the arrangement from FIG. 1, electrical potentials of the roller surfaces being shown;
- Figure 4 shows an arrangement for cleaning an applicator element with the aid of a magnetic roller arrangement, wherein a squeegee - magnetic element device is used to clean the magnetic roller arrangement;
- FIG. 5 shows an arrangement for developing a latent charge image on a photoconductor drum with the aid of a magnetic roller arrangement and a doctor blade magnetic element device for cleaning the magnetic roller arrangement;
- Figure 6 shows an embodiment for the configuration of the
- Magnetic stators and the doctor blade in which the surface of the magnetic roller arrangement is cleaned of toner particles
- FIG. 7 shows the movements within the particle mixture in the area of the magnetic roller in the arrangement shown in FIG. 5;
- FIG. 8 shows an arrangement for removing the toner particles from a magnetic roller with the aid of a magnetic arrangement consisting of two magnetic elements, the magnetic roller being used for removing a homogeneous toner layer on an applicator roller;
- FIG. 9 shows an arrangement for removing the toner particles from a magnetic roller with the aid of a magnetic arrangement comprising two magnetic elements, the magnetic roller being used for developing a latent charge image on a photoconductor;
- Figure 10 shows an embodiment for the configuration of the
- FIG. 11 shows the formation of magnetic brushes on the magnetic elements and the movements within the particle mixture on the roller surface, which are indicated by the arrows next to the mixture;
- FIG. 12 shows the field distribution in the magnetic near field directly on the roller surface of the one shown in FIG. 10
- Figure 13 shows the field distribution in the far magnetic field in
- FIG. 1 shows an arrangement 10 for toner accumulation on an applicator roller 12 with the aid of a first magnet roller arrangement 14, a particle mixture of electrically charged particles being deposited on the applicator roller 12
- Toner particles and ferromagnetic carrier particles a so-called two-component mixture, is used.
- Such an applicator roller 12 is used in a printer or copier to transport toner particles.
- the toner particles are also generally referred to as toner.
- Applicator rollers are used in particular to develop a latent charge image on a photoconductor element with toner, the surface of the applicator roller being provided with a uniform toner layer. The uniform toner layer is guided past the latent charge image of the photoconductor element, the toner layer being transferred from the applicator roller to the photoconductor element in the areas of the latent charge image to be colored.
- a so-called magnetic brush is formed from the two-component mixture between the first magnetic roller arrangement 14 and the applicator roller 12.
- elongated magnetic elements 28, 20, 32, 34 are located on a stator 26, the outward-facing poles of which alternate in the circumferential direction.
- the ferromagnetic carrier particles are arranged and aligned on each magnetic element 28, 20, 32, 34 by the force of the magnetic field along the magnetic field lines, with an accumulation of protruding from the roller surface 24 on the surface of the roller 24 in the region of the outwardly facing poles of the magnetic elements 28 to 34 Carrier particles and the toner particles adhering to them are formed.
- Such a protruding accumulation of carrier particles is referred to as a magnetic brush due to the brush-like shape.
- a prepared two-component mixture with a predetermined proportion by weight of toner particles is fed to the first magnetic roller arrangement 14 in the region 20, the toner particles being charged triboelectrically.
- the weight percentage of the toner is typically in the range of 2% to 8%.
- the two-component mixture is supplied e.g. by a paddle wheel arrangement, not shown.
- a metering doctor 22 arranged at a predetermined distance from the first magnetic roller arrangement 14 produces a uniform layer of the two-component mixture 20 on the outer surface of the roller 24.
- the first magnetic roller arrangement 14 contains a rotating hollow roller 24, in the interior of which a magnetic roller stator 26 is arranged, which contains the magnetic elements 28, 30, 32, 34.
- the longitudinal axes of the magnetic elements 28, 30, 32, 34 are aligned in the radial direction, the north pole N and south pole S of adjacent magnetic elements 28, 30, 32, 34 each following one another in the circumferential direction.
- the magnetic elements 28, 30, 32, 34 are rod-shaped
- Permanent magnets and extend across the entire width of the roller.
- the distance between each of the permanent magnets 28, 30, 32, 34 and the inner surface of the roller 24 is set in the range from 0.2 to 1 mm, with each of the permanent magnets 28, 30, 32, 34 and the outer peripheral surface of the roller 24 gives a distance in the range of 1.2 mm to 3 mm.
- In the field of Magnetic brush 18 is ideally a constant toner supply in the two-component mixture.
- the toner particles on the carrier particles of the magnetic brush 18 are deposited on the surface of the applicator roller 12 as a uniform toner layer 36.
- the applicator roller 12 is guided past a photoconductor, not shown. According to the latent charge image of the photoconductor, areas of the toner layer 36 are transferred to the photoconductor via an air gap or in direct contact between the applicator roller 12 and the photoconductor. The areas 38, 40, 42 of the toner layer 36 which are not transferred to the photoconductor form the image negative for the latent charge image and must be removed from the applicator roller 12.
- the cleaning is carried out by a second magnetic roller arrangement 16.
- This second magnetic roller arrangement 16 like the first magnetic roller arrangement 14, has a rotating hollow roller 44 and a magnetic roller stator 46 which contains rod-shaped magnetic elements 48, 50, 52 which are designed as permanent magnets and are radially aligned.
- the direction of rotation of the applicator roller 12 is with the arrow P1, the direction of rotation of the roller 24 with the arrow P2 and the direction of rotation of the roller 44 with the
- the two-component mixture is transferred in the area 54 from the surface of the roller 24 to the surface of the roller 44 with the aid of the magnetic field of the magnetic elements 34 and 48.
- the ferromagnetic carrier particles become electrostatically adhering to them when the roller 24 rotates in the resulting magnetic particles Field between the south pole S of the permanent magnet 34 and the north pole N of the permanent magnet 48 transported.
- the proportion by weight of the toner particles in the two-component mixture in the region 54 is reduced compared to the two-component mixture that is supplied in the region 20 as a result of the toner transfer to the applicator roller 12.
- This two-component mixture with a reduced toner content is transported further to the area 56 on the surface of the roller 44.
- the magnetic field of the magnetic element 50 effective in the area 56 generates a magnetic brush.
- area 56 the distance between roller 44 and applicator roller 12 is relatively small.
- the magnetic brush in area 56 contains the two-component mixture with a reduced toner content.
- the toner residues 38, 40, 42 are electrostatically released due to the potential difference between the surfaces of the roller 44 and the applicator roller 12 and by rubbing the magnetic brush on the surface of the applicator roller 12 and transported in the direction of the roller 44.
- the two-component mixture of the magnetic brush 56 touches the surface of the applicator roller 12 and additionally rubs the toner particles off the surface of the applicator roller 12.
- FIG. 2 shows an arrangement 64 similar to the arrangement 10 from FIG. 1. The same elements have the same reference symbols.
- a guide element 66 is used to transfer the two-component mixture in the area 54.
- a guide element 66 is designed, for example, as a guide plate.
- the axis of rotation 68 of the first magnet roller arrangement 14 is arranged above the axis of rotation 70 of the second magnet roller arrangement 16, viewed in the vertical direction.
- the guide element 66 is arranged obliquely so that the two-component mixture can slide or slide from the first magnet roller arrangement 14 to the second magnet roller arrangement 16 on an inclined plane.
- FIG. 3 shows the arrangement 10 shown in FIG. 1 with the electrical potentials of the roller surfaces set in the operating state.
- the surface of the applicator roller 12 has a potential difference DC1 with respect to a ground potential as a reference potential
- the outer surface of the roller 24 has a potential difference DC2 with respect to the ground potential
- the outer surface of the roller 44 has a potential difference DC3 with respect to the ground potential.
- a negative toner system is used.
- the potential difference DC1 should be set smaller than the potential difference DC2 and the potential difference DC3 larger than the potential difference DC1, taking into account the sign in a negative toner system.
- a positive toner system is used in the arrangement shown in FIG. 3, taking into account the sign is the Set potential difference DC1 smaller than the potential difference DC2 and the potential difference DC3 smaller than the potential difference DC1.
- the potential differences are generated by DC voltage sources 72, 74, 76.
- Negative voltages are also possible with regard to the ground potential.
- the potentials to be set depend primarily on the composition of the toner material, on the distances between the rollers 12, 24, 44 and on the roller materials.
- the electrostatic processes which are achieved by the set potentials DC1, DC2, DC3 are primarily due to the potential difference (DC1-DC2) between the surfaces of the applicator roller 12 and the magnet roller arrangement 14 and of the potentials resulting from the potentials DC1, DC2, DC3 the potential difference (DC1-DC3) between the surfaces of the applicator roller 12 and the magnetic roller arrangement 16 depending on the sign.
- roller 12 to be cleaned for example an applicator roller or a photoconductor roller
- the mechanical stress on the toner is also due to the little or no direct uptake of the toner particles into the two-component mixture.
- Particle mixtures can be dispensed with in a printing or copying machine with an arrangement according to FIGS. 1 to 3
- Toner particles and carrier particles with different physical properties i.e. use with different toner parameters, which allows a large working range with regard to these parameters of the particle mixture.
- No special additives are required for the cleaning device, such as those e.g. are required for cleaning systems with blades in which additional waxes have to be added to the toner.
- FIGS. 1 to 3 not only is the applicator roller surface inked electrostatically with the aid of a magnetic roller arrangement 14, but also its cleaning.
- the electrical potentials DC1, DC2, DC3 explained in the description of FIG. 3 and the resulting potential difference between the surfaces of the applicator roller 12 and the roller 44 generates an electric field between the rollers 12, 44, the force of which on the toner particles in the direction the roller 44 or in the direction of the two-component mixture acts on the roller surface.
- the toner can be removed from the applicator roller 12 in direct contact with the two-component mixture, or it can be transferred via an air gap between the applicator roller 12 and the magnetic roller arrangement 16 to the two-component mixture on the surface of the magnetic roller arrangement 16.
- FIG. 4 shows an arrangement for cleaning an applicator roller 78 with the aid of a magnetic roller system 80 with a rotating hollow roller 81.
- This arrangement also includes a cleaning device with magnetic elements
- the magnetic roller system 80 is arranged at a predetermined distance from the applicator roller 78 and has a magnetic roller stator 84 on which permanent magnets 86 to 100 are arranged at an equal distance from one another on a circular path around the axis of rotation 127 of the magnetic roller system 80 are.
- the axis of the poles N, S of each individual permanent magnet 86 to 100 is aligned radially to the axis of rotation 127, ie the north pole N or the south pole S of each permanent magnet 86 to 100 faces the surface of the roller 81 of the magnetic roller system 80.
- the roller 81 is supplied with ferromagnetic carrier particles as pure carrier particles or with the aid of a particle mixture of carrier particles and toner particles.
- This supply of carrier particles can e.g. by a second roller system (not shown) for toner accumulation on the applicator element 78, as has already been explained in FIGS. 1 and 2.
- these carrier particles can also be fed to the magnetic roller system 80 from a storage container.
- the magnetic fields of the fixed permanent magnets 88, 90, 92, 94 form magnetic brushes 104, 106, 108, 110, 112 from carrier particles on the surface of the roller 81.
- the permanent magnet 90 is arranged in the area with the smallest distance between the applicator roller 78 and the magnetic roller system 80.
- the magnetic brush 106 formed on the surface of the roller 81 rubs on the surface of the applicator roller 78, whereby the toner particles 79 to be removed are rubbed off.
- the toner particles 79 attach to the carrier particles of the magnetic brush 106.
- the detachment of the toner particles 79 from the surface of the applicator roller 78 and the attachment of these toner particles to the carrier particles of the magnetic brush 106 is further influenced by the force of an electric field on the toner particles 79 and by the particles rubbing on the surface of the applicator roller 12.
- This electric field arises due to the potential difference DC between see the surfaces of the applicator roller 78 and the roller 81, which is set by means of a DC voltage source 116.
- the directions of rotation of the applicator roller 78 and the roller 81 are the same, as indicated by the arrows P4 and P5. It is thereby achieved that a large amount of ferromagnetic carrier particles is guided past the applicator roller 12 in the area of the magnetic brush 106 past the applicator roller 78, with the help of the magnetic brush 106 also exerting a mechanical brush effect on the surface of the applicator roller 78 the toner particles are rubbed off the surface.
- the peripheral speeds of the applicator roller 78 and the magnetic roller system 80 are approximately the same.
- the peripheral speed of the magnetic roller system 80 is smaller or greater than the peripheral speed of the applicator roller 78.
- the directions of rotation of the applicator roller 78 and the magnetic roller system 80 are opposite to each other, so that e.g. the direction of rotation of the magnetic roller system 80 is opposite to the direction of rotation according to the arrow P5. It is thereby achieved that the mechanical stress on the carrier particles and toner particles in the area of the magnetic brush 106 is further reduced.
- the elements of the arrangement i.e. to arrange the area 102 and the doctor blade 82 mirrored on the straight line through the two axes of rotation of the applicator roller 78 and the magnetic roller system 80.
- the further magnetic brushes 104, 108, 110, 112 then also form on the permanent magnets 92, 88, 86, 100 arranged mirrored on this straight line.
- the toner particles removed from the applicator roller 78 in the area of the magnetic brush 106 are taken up by the carrier particles of this magnetic brush and are moved in the direction of rotation of the magnet. gnetwalzensystems 80 transported away.
- the permanent magnet 96 is arranged in the direction of rotation P5 of the magnetic roller system 80 just before the doctor blade 82.
- the cutting edge of the doctor blade 82 is arranged at a predetermined distance from the surface of the roller 81, as a result of which a part of the particle mixture of carrier particles and toner particles is stripped off the surface of the magnetic roller system 80 when the magnetic roller system 80 rotates.
- Two-component mixture in the lower region 114 of the grape fall into a collecting container, not shown, for reprocessing the particle mixture.
- the carrier particles and toner particles are mixed and swirled in the region 112, so that the particle mixture rubs on its surface when the roller 81 rotates, whereby toner particles which adhere directly to the surface of the roller 81 are rubbed off by the latter become.
- the movement processes within the grape, i.e. in area 112 are explained in more detail below in connection with FIG. 7.
- the particle mixture falls directly into a so-called mixture sump in which the two-component mixture is processed.
- FIG. 5 essentially shows the arrangement from FIG. 4, which, however, serves here to develop a latent charge image that is located on the surface of a photograph.
- conductor drum 77 is located.
- a toner layer 118 is applied or deposited on the surface of the photoconductor drum in the areas to be colored.
- the structure of the arrangement shown in Figure 5 is similar to the arrangement shown in Figure 4 for cleaning the applicator roller 78. The same elements have the same reference numerals.
- a two-component mixture i.e. a particle mixture of carrier particles and toner particles, in which the toner particles unite
- a magnetic brush is formed in the region 106 by the permanent magnet 90. This magnetic brush touches the surface of the photoconductor drum 77. As already mentioned, a latent charge image is present on this surface. Due to the charge image in the areas to be inked, the surfaces of the photoconductor drum 77 have a potential difference DC to the roller 81, which is generated by the DC voltage source 122.
- the potential of the areas of the photoconductor drum 77 to be inked must be set positively in relation to the potential of the surface of the roller 81.
- the potential of the areas of the photoconductor drum 77 to be inked must be set negatively compared to the potential of the surface of the roller 81.
- the potential difference between the areas of the photoconductor drum 77 and roller 81 to be colored causes the electrostatic depositing of toner particles 118 on the surface of the photoconductor drum 77 in the areas to be colored.
- FIG. 6 shows an enlarged view of the magnetic roller system 80 which is used in the arrangements shown in FIGS. 4 and 5.
- the distance between the cutting edge of the doctor blade 82 and the outer surface of the roller 81 is denoted by AI.
- This distance AI is set depending on the physical properties of the particle mixture in the range of 0.05 to 6 mm. In the embodiment shown, the distance AI is set in the range from 0.1 mm to 4 mm.
- the longitudinal axis 123 of the permanent magnet 96 arranged on the magnetic roller stator 84 is arranged at a predetermined distance A2 in the direction of rotation of the roller 81 in front of the cutting edge of the doctor blade 82.
- This distance A2 is set in the range from 0.01 to 10 mm depending on the physical properties of the particle mixture and on the peripheral speed. A particularly effective cleaning effect could be achieved at a distance in the range from 4 mm to 6 mm.
- the longitudinal axes 123, 124, 125, 126 of the permanent magnets 86 to 100 pass through the axis of rotation 127, ie the centers of the north pole N and the south pole S of the permanent magnets 86 to 100 lie approximately on the straight lines 123 to 126.
- the straight lines 123 to 126 are at an angular distance of 45 ° from one another, ie the permanent magnets 86 to 100 are arranged at the same angular distance from one another on a circular path around the axis of rotation 127.
- a distance in the range from 0.2 mm to 1.5 mm is set in each case between the permanent magnets 86 to 100 and the inner surface of the roller 81.
- the roller 81 results from the material thickness of the roller 81 and is in the range of 2.3 mm and 3.5 mm.
- a distance between the side of the permanent magnets 86 to 100 facing the roller 81 and the inner surface of the roller 81 in the range from 0.2 mm to 1 mm and the outer surface of the roller 81 in the range from 2 mm to 3 has proven particularly favorable mm proven.
- the distance between the permanent magnets 86 to 100 and the surface of the roller 81 is dependent on the field strength of the magnetic elements 86 to 100 used, on the printing speed of the printing or copying device, especially on the peripheral speed of the outer roller surface physical properties of the toner used and especially the physical properties of the carrier particles.
- the carrier particle material e.g. Use ferrites and iron, the magnetic saturation of the carrier particle material being particularly important.
- the distance depends on the overall arrangement of the printing or copying device. In this way, distances can also be set which are outside the ranges mentioned, if the peripheral speed increases, other toner material is used, other carrier particle materials are used and / or a changed overall arrangement of the printing or copying device is used.
- FIG. 7 shows a section of the magnetic roller system 80 together with the doctor blade 82, the movements within the particle mixture which result when the roller 81 rotates in the direction of arrow P5
- arrows P6, P7, P8, P9 are shown.
- the arrangement of the particle mixture in region 112 is also opposite the representations of Figures 4 and 5 shown in more detail.
- a magnetic brush 128 is formed by its magnetic field.
- a cluster of the particle mixture of toner particles and carrier particles is formed, which are held in this area by the magnetic field of the permanent magnet 96.
- the particle mixture is transported from the magnetic brush in the area 128 in the direction of the arrow P7 to the grape-shaped accumulation of the particle mixture in front of the doctor blade 82.
- a part of the particle mixture is held in a grape shape in the area 130 in the direction of rotation of the roller 81 in front of the doctor blade 82 by the field forces of the permanent magnets 96, 98. Due to the rotary movement of the hollow roller 81 and the associated supply of further particle mixture, a rotating roller-shaped movement is formed in front of the doctor blade 82 within the particle mixture, which is indicated by the arrow P8.
- the particle mixture is circulated in the area 130 in front of the doctor blade 82, as a result of which it rubs on the surface of the roller 81. Above all, the carrier particles rub, whereby toner particles that adhere directly to the roller surface are rubbed off the roller surface.
- the formation of an electrically insulating, crust-shaped layer and electrically insulating regions from toner particles on the magnetic roller surface is accomplished by the
- the distance A2 to be set between the permanent magnet 96 and the cutting edge of the doctor blade 82 depends on the peripheral speed of the roller 81, on the surface roughness of the roller 81, on the toner used, on the carrier particle material used, on the speed of the printing or copying device and on the total - Arrangement of the printing or copying device.
- the surface of the roller 81 is electrically conductive. It can contain, for example, aluminum, copper, nickel, conductive plastic or a combination of these materials, for example an alloy.
- the poles N, S of the magnetic elements 86 to 100 can vary in shape, shape and field strength.
- the shape of the magnetic elements 86 to 100 cannot be rod-shaped, so that only the pole N, S facing the roller surface acts in the direction of the normal.
- the magnetic elements 86 to 100 can have different field strengths.
- a resulting magnetic field is formed between the poles N, S of permanent magnets 86 to 100 arranged next to one another with opposite orientation, for example between the south pole S of the permanent magnet 94 and the north pole N of the permanent magnet 96, which results from an addition of the field vectors of the magnetic fields .
- the ferromagnetic carrier particles of the two-component mixture align themselves on the field lines of the resulting magnetic field.
- the continuously applied particle mixture is transported on the surface of the roller 81 by rotating it.
- the roller 81 has a roughness in the range from 1 ⁇ m to 5000 ⁇ m. It has proven particularly favorable to set the roughness in the range from 10 ⁇ m to 3000 ⁇ m.
- the distance Al between the surfaces of the doctor blade 82 and the roller 81 is preferably less than the thickness of the layer of the particle mixture in front of the doctor blade 82.
- the thickness of the layer of the particle mixture remaining after the doctor blade 82 is due to the distance Al between the roller surface and the doctor blade edge limited and can be adjusted by changing the distance AI.
- the part of the particle mixture blocked by the doctor blade 82 forms the standing particle mixture relative to the roller 81 on the surface thereof.
- the force with which the ferromagnetic particle mixture of toner particles and carrier particles adheres to the surface of the roller 81 is dependent on the ferromagnetic properties of the carrier particle material, on the magnetic field strength of the magnetic elements 86 to 100, especially on the field strength of the permanent magnets 96, 98 and depending on the distance between the surface of the roller 81 and the respective permanent magnet 86 to 100.
- the standing particle mixture in the region 112 or 130 in front of the doctor blade 82 rubs on the outer surface of the roller 81 when the roller 81 rotates in the direction of arrow P5. This friction rubs off the toner adhering to the surface of the roller 81 and again by the particle mixture recorded, the rubbed-off toner particles on the
- Stick carrier particles electrostatically. It is thereby achieved that a permanent layer of toner particles on the surface of the roller 81 is prevented and the electrostatic process in the printer or copier is not impaired.
- the proportions of the particle mixture that pass through the doctor blade 82 remain on the surface of the roller 81.
- Others Embodiments can also be separated from the roller surface by appropriate design of the MagnetStator 136 and fed to a collecting device, for example the mixture sump of the printer or copier, or transferred to an adjacent magnetic roller system.
- the outer surface of the roller 81 with a coating which has a very low surface energy.
- a coating can e.g. with the help of Teflon.
- the entire roller 81 can also be made from such a material.
- such a coating should not have any electrically insulating properties, but should be correspondingly conductive for the charge transport from and to the roller 81.
- Embodiments are also possible in which the highly insulating material with low surface energy is applied only in the depressions of a rough surface of the roller 81.
- the remaining conductive areas ensure the necessary charge flow.
- the arrangement for cleaning does not require any additional auxiliary energy.
- the toner processes are additionally charged triboelectrically when the toner is cleaned.
- the arrangement for cleaning the surface of magnetic roller systems contains no wearing parts. Due to the simple structure, a compact design of the cleaning device and the entire printing or copying device is also possible. It is also suitable for different particle mixtures with different toner parameters.
- the magnetic roller system 80 can both remove toner particles from applicator rollers 78 and from photoconductors, as well as develop latent charge images on photoconductors and color applicator rollers 78.
- application tapes or transfer tapes can also be used.
- other magnetic elements, such as electromagnets are used instead of the permanent magnets.
- the arrangements shown in FIGS. 4 and 5 can also be used, for example, with an arrangement according to FIGS. 1 and 2.
- FIG. 8 shows an arrangement for cleaning the surface of an applicator roller 132.
- This arrangement serves to remove a toner layer 133 and toner residues from the surface of the applicator roller 132 and contains a magnetic roller arrangement 134 with a magnetic roller stator 136, which has permanent magnets 138, 140, 142, 144 and with a rotating hollow roller 162, which with a drive unit, not shown Pll is driven in the direction of rotation.
- the toner particles of the toner layer 133 adhere electrostatically to the surface of the applicator roller 132.
- a drive unit not shown, drives the applicator roller 132 in the direction of rotation of the arrow P10.
- a DC voltage source not shown
- the magnetic roller system 134 is supplied with ferromagnetic carrier particles with the aid of a device, not shown.
- a particle mixture of electrically charged toner particles and ferromagnetic carrier particles can also be supplied to the magnetic roller system 134 in the region 146.
- the orientation of the poles N, S of the magnetic element 138 is radial to the axis of rotation 164, ie that in each case the north pole N or the south pole S of a magnetic element 138, 140, 142, 144 faces the inner surface of roller 162.
- the magnetic element 140 is arranged in the area with the smallest distance between the applicator roller 132 and the roller 162. If the poles N, S are viewed as points, the poles N, S of the magnetic element 140 lie approximately on a straight line 166, shown as a dash-dot line, which intersects the axes of rotation 164, 165 of the magnetic roller system 134 and the applicator roller 132.
- the longitudinal axis of the magnetic element 138 which intersects the axis of rotation 164, is rotated relative to the straight line 166 by approximately 50 ° against the direction of rotation P1 of the roller 162.
- the longitudinal axis of the magnetic element 142 is rotated by approximately 50 ° with respect to the straight line 166 and the longitudinal axis of the magnetic element 144 is rotated with respect to the straight line 166 by approximately 100 ° in the direction of rotation P1 of the roller 162.
- the longitudinal axes of the magnetic elements 142 and 144 also run through the axis of rotation 164 of the magnetic roller system 134.
- Magnetic brushes are formed on the outer surface of the roller 162 in the areas 148, 150, 152, 154 by the magnetic fields of the magnetic elements 138 to 144.
- the distance between the outer surfaces of the roller 162 and the applicator roller 132 is set such that the magnetic brush formed by the magnetic field of the magnetic element 140 contacts the roller surface of the applicator roller 132 in the region 150.
- the toner particles of the layer 133 are removed from the surface of the applicator roller 132 and adhere to the ferromagnetic carrier particles of the magnetic brush 150.
- this process is supported by the potential difference DC between the surfaces of the applicator roller 132 and the roller 162 of the magnetic roller system 134 generated by the DC voltage source 160.
- DC potential difference
- the potential difference DC to be set depends on the toner system used.
- the carrier particles are transported between the magnetic elements 138 and 140 on the surface of the roller 162. Between the magnetic element 140 and the magnetic element 142, the particle mixture of ferromagnetic carrier particles and the toner particles removed from the surface of the applicator roller 132 is caused by the rotational movement of the roller 162 in the direction of the arrow Pll transported.
- the magnetic fields of the magnetic elements 142, 144 act essentially in the same direction, the north poles N of the magnetic elements 142, 144 being directed towards the surface of the roller 162.
- the adjacent poles N, N of the two magnetic elements 142, 144 facing the particle mixture are thereby of the same type.
- the adjacent edges of these magnetic elements 142, 144 are viewed at a distance in the direction of rotation
- the distance between the adjacent edges does not have to be constant.
- the magnetic fields of the magnetic elements 142, 144 overlap, the resulting magnetic field at each point in space being the resulting vector of an addition of the field vectors generated by the magnetic elements 142, 144.
- the field vectors In the area between the magnetic elements 142, 144 on the surface of the roller 162, the field vectors have approximately the same amount and are directed approximately in opposite directions, so that the resulting magnetic field strength is low in this area.
- the field vectors At a distance of approximately 5 mm from the surface of the roller 162, the field vectors have the same amount, but the directions are no longer approximately opposite.
- the ferromagnetic carrier particles are pulled in the direction of high magnetic field strengths. This means that the carrier particles correspond to the resulting magnetic field strength are pulled into the area 156 with a high magnetic field strength at a distance between 5 mm and 15 mm to the surface of the roller 162.
- carrier particles are conveyed into the area 152, then pushed into the area 156 and then fed to the magnetic brush in the area 154, whereby in the area 156 they are at a distance from the surface of the roller 162 due to the resulting magnetic field.
- the particle mixture of carrier particles and toner particles falls in the region 158 downward from the magnetic brush 154 into a collecting container (not shown), for example into a so-called mixture sump of the printer or copier, for recycling the particle mixture.
- Toner particles adhere to the carrier particles throughout the cleaning process.
- the toner particles rubbed off the roller surface also adhere to the carrier particles and are transported together with them.
- the arrangement of the magnetic elements 138 to 144 achieves a self-cleaning effect on the conductive surface of the roller 162.
- This self-cleaning effect is based on the fact that in the two adjacent magnetic elements 142, 144 the north and south poles N, S are oriented approximately in the same direction, as a result of which a standing particle mixture is generated on the surface of the roller 162 in the areas 152, 154 that rubs on the surface and detaches toner particles from it.
- the resulting magnetic field has a low resulting field strength between the magnetic elements 142, 144 on the surface of the roller 162.
- the transport of the particle mixture during the rotation of the roller 162 takes place in the area 156 at a distance from the surface of the roller 162.
- the particle mixture remains in the area of the magnetic brush 152, whereby the mixture transport is inhibited.
- the force with which the particle mixture of ferromagnetic carrier particles and electrically charged toner particles adheres to the surface of roller 162 is directly dependent on the magnetic field strength Magnetic elements of the magnetic roller stator 136 depend, especially on that of the magnetic element 142.
- the standing particle mixture adhering to the surface of the roller 162 rubs off the toner particles adhering to the surface of the roller 162 in the regions 152, 154.
- the rubbed-off toner particles adhere to the carrier particles and fall down with them in the region 158.
- the surface of roller 162 cleaned in this way ensures that the continuous electrostatic process in the printer or copier is not impaired. Due to the friction between carrier particles and toner particles, the toner particles partially discharged by the previous electrophotographic process continue to be triboelectrically charged.
- the north poles N of the magnetic elements 142, 144 can be regarded as a common north pole.
- the particle mixture is drawn in the far field direction from the surface of the roller 162 into the area with high magnetic field strength, which, however, is less than the field strength on the roller surface at the poles.
- the particle mixture remains on the roller surface in the regions at the poles N, N of the magnetic elements 142, 144 and forms collections there.
- part of the particle mixture is pushed away from the roller surface by the particle mixture being conveyed.
- the magnetic field strength decreases with the distance to the magnetic element.
- the particle mixture is then pushed further through the particle mixture conveyed.
- the design of the magnetic roller stator 136 and the arrangement of the magnetic elements 138 to 144 on this stator 136 have the effect that in region 158 the resulting magnetic field is formed on the surface of the roller 162 in such a way that the particle mixture falls down.
- arrangements of the magnetic elements are provided, which further transport on the roller 162 or a transfer of the particle mixture to an adjacent beard magnetic roller system enable.
- the resulting 'distance of the particle mixture to the surface of the roller 162 in the region 156 is primarily the magnetic field strength of the magnetic elements 142, 144, the distance between the north poles N of these magnetic elements 142, 144 and the outer surface of the roller 162, the thickness and the material of the roller 162, the roughness of the roller 162 and the peripheral speed of the roller 162.
- the dropping of the particle mixture in the region 158 occurs when the centrifugal force tangential to the roller 162, which is caused by the rotation of the roller 162, outweighs the radially acting magnetic force on the particle mixture.
- a transfer to an adjacent magnetic roller system takes place when the magnetic configuration produces a sufficiently large magnetic flux between the adjacent roller system and the magnetic roller system 134.
- the standing particle mixture at the north poles N of the magnetic elements 142, 144 which act in approximately the same direction, is replaced by newly supplied particle mixture when the rollers 132, 162 rotate, and is therefore constantly exchanged.
- the standing particle mixture is not continuously enriched with toner.
- the roller 162 can be provided with a coating which has a very low surface energy, e.g. with Teflon.
- a closed coating that is electrically insulating should not be used in order not to hinder the electrostatic process. In order to transport the charge to and from the roller 162, its surface must be electrically conductive.
- highly insulating materials with low surface energy can also be embedded in the depressions of a rough surface structure of the roller 162. to be brought.
- the remaining conductive areas of roller 162 then ensure the required flow of charge.
- no additional devices for removing toner residues on the roller 162 are required.
- Additional auxiliary energy for cleaning the roller 162 is not required.
- the arrangement has wear parts and consumables are required. This makes it low-maintenance. This arrangement can be used for different types of toner, the different
- the arrangement shown in FIG. 8 is used to clean a magnetic roller 162, which is used to color a surface.
- Incorrectly charged toner particles may be contained in the particle mixture for coloring. Due to the force acting on these toner particles due to a potential difference, these toner particles are not transported to the surface to be colored, but instead adhere to the surface of the magnetic roller 162, on which they then form an electrically insulating layer. The cleaning of this magnetic roller 162 according to the invention prevents the formation of such a layer.
- FIG. 9 shows an arrangement for coloring a latent charge image arranged on a photoconductor drum 168 in an electrophotographic printer or copier.
- the arrangement is essentially structured like the arrangement shown in FIG. 8 for cleaning the applicator roller 132.
- the same elements have the same reference symbols.
- the photoconductor drum 168 is moved in the direction of the arrow P10 and is arranged at a distance from a magnetic roller system 134.
- the structure of the magnetic roller system 134 has already been described in connection with FIG. 8.
- a two-component mixture ie a particle mixture
- Toner particles and carrier particles supplied which has a high weight fraction of toner particles in the range of 2% to 8%.
- the magnetic field of the magnetic element 140 forms a magnetic brush made of the two-component mixture, which contacts the surface of the photoconductive drum 168.
- This potential difference DC detaches the toner particles from the surface of the roller 162 and attaches them to the surface of the photoconductor drum 168.
- the standing particle mixture in the areas 152, 154 rubs by roller-shaped rotating movements within the particle mixture on the surface of the roller 162.
- the toner particles on the surface are rubbed off, as already described in connection with FIG. 8.
- the formation of the standing particle mixture, the transport and the dropping of the particle mixture in the region 158 likewise takes place as in the arrangement shown in FIG. In the arrangement shown in FIG. 9, in particular such embodiments are possible which have already been described in connection with FIG. 8.
- the so-called memory effect is effectively avoided in an electrophotographic printer or copier with an arrangement according to FIG. 9 by cleaning the roller 16
- FIG. 10 shows the magnetic roller system 134 according to FIGS. 8 and 9 in an enlarged representation. They are between the axes 174 to 177 of the poles N, S of the magnetic elements 138 to 144 included included angles.
- the axes 174 to 177 of the magnetic elements 138 to 144 each have an angular distance of approximately 50 ° from one another.
- the angle to be set can also have a value that deviates greatly from 50 °, for example this angle can be in the range between 10 ° and 100 °.
- FIG. 11 shows a section of the magnetic roller system 134 together with the particle mixture of toner particles and carrier particles when the roller 162 rotates.
- the movements of the particle mixture can be seen from the arrows P12 to P16.
- the particle mixture is transported from the south pole S of the magnetic element 140 to the north pole N of the magnetic element 142 in the direction of the arrow of the arrow P12 on the surface of the roller 162 by its rotational movement.
- the standing particle mixture occurs in the region of the north pole N of the magnetic element 142 on the surface of the roller 162.
- the parts of the standing particle mixture that enter the far magnetic field in the outer area 152 of the magnetic brush due to the increasing accumulation of the Particle mixtures are pushed off and which, as already described, are drawn in the direction of arrow P14 into the common far magnetic field of the magnetic elements 142, 144, are at a distance from the surface of the roller 162 in the region 156, the particle mixture being conveyed in the region 152 by the continuous feeding is transported in the direction of arrow P14 through area 156 to area 154.
- a portion of the particle mixture is supplied at a distance from the surface of the roller 162 in the region 156 in accordance with the arrow P15 to the region 154 in front of the north pole N of the magnetic element 144.
- the remaining part falls directly into a collecting container, not shown, e.g. into a mixed sump of the printer or copier.
- the magnetic field of the magnetic element 144 also generates a standing particle mixture on the surface of the roller 162 in the region 154, a rotating roller-shaped movement in the particle mixture also taking place there, by means of which toner particles are rubbed off the surface of the roller 162. This rotating movement within the standing particle mixture is shown by arrow P16.
- the continuous supply of the particle mixture into the area 154 causes an accumulation of particles in this area 154.
- particles are pushed outwards into areas with a low magnetic field strength, i.e. away from the roller surface.
- the force effect of the magnetic field decreases with increasing distance from the magnetic element 144, and part of the particle mixture in the outer region 154 of the magnetic brush falls down due to the force of gravity.
- the downward falling particle mixture is shown in area 158.
- the north and south poles N, S of the magnetic elements 142, 144 are arranged opposite to the orientation shown in FIG. 11, ie the south poles S of the magnetic elements 142, 144 act in approximately the same direction and are the surface of the roller 162 Trains- Wundt.
- the arrangements according to FIGS. 1 to 11 are sectional representations of roller arrangements.
- the magnetic elements shown therein are preferably arranged over the entire width of the respective magnetic roller.
- the width of the magnetic roller is preferably greater than or equal to the possible printing width of the printer or copier.
- the magnetic elements can also be composed of several individual magnets.
- the axis through the poles N, S of the magnetic elements is referred to as the longitudinal axis of the magnetic elements.
- the opposing poles N, S of the poles N, S facing the particle mixture do not act in the opposite direction due to the design of the magnetic elements.
- the shape of the raised accumulations of the particle mixture, ie the magnetic brushes and the standing particle mixtures, can be influenced by this constructive design.
- the poles N, N act approximately in the radial direction.
- FIG. 12 shows the field distribution in the magnetic near field directly on the surface of the roller 162 of the magnetic roller system 134 in a polar coordinate system.
- the magnetic flux density is plotted on the axis of the polar coordinate system.
- the specified numerical values from 0 to 1 indicate the magnetic flux density in Gauss when multiplied by 2000. When multiplying by 0.2, these numerical values indicate the magnetic flux density in Tesla.
- the longitudinal axis through the magnetic element 140 is the 90 ° axis in the diagram.
- the orientation of the resulting magnetic field, which generates the magnetic flux density is identified by the letters N and S arranged next to the curves in the diagram.
- the flux density is directly proportional to the magnetic field strength, whereby the magnetic flux density is the product of absolute permeability and the magnetic field strength.
- the magnetic element 142 shown in FIG. 11 generates a maximum magnetic flux density of 1800 gauss on the surface of the roller 162. This also creates on the surface of roller 162 Magnetic element 144 shown in FIG. 11 has a maximum flux density of approximately 1780 gauss. A minimal resulting flux density of approximately 100 gauss results in region 156.
- FIG. 13 shows the field distribution in the far magnetic field at a distance of approximately 9 mm from the surface of the roller 162.
- the scale division coincides with the scale division of the diagram shown in FIG.
- the magnetic far field in the area 156 between the magnetic elements 142, 144 at a distance of approximately 9 mm from the surface of the roller 162 has a relatively high magnetic flux density of up to 950 gauss.
- the maximum difference in magnetic flux density in the area 156 between the surface and an area 9 mm from the surface is 850 gauss.
- the magnetic field at a distance of 9 mm is thus many times stronger in the region 156 than on the surface of the roller 162. Because of the strong magnetic far field, the particle mixture is detached from the surface of the roller 162 in the region 156 and the standing Particle mixtures in the
- FIGS. 8 and 9 can be provided with a squeegee in other exemplary embodiments, e.g. at a predetermined distance in
- FIGS. 8 and 9 can be combined with elements of the arrangements shown in FIGS. 4 and 5. All magnetic elements can be designed as electromagnets or as permanent magnets, depending on the requirements for the field strength and the embodiment.
- the arrangements shown in FIGS. 4 and 5 or 8 and 9 for applying toner and for cleaning surfaces can also be used in arrangements which are constructed like the arrangements shown in FIGS. 1 and 2.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Cleaning In Electrography (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10152892 | 2001-10-26 | ||
DE10152892A DE10152892A1 (de) | 2001-10-26 | 2001-10-26 | Verfahren und Vorrichtung zur Reinigung von Trägerelementen in Druckern oder Kopierern unter Anwendung von Magnetfeldern |
PCT/EP2002/011953 WO2003036393A2 (de) | 2001-10-26 | 2002-10-25 | Verfahren und vorrichtung zur reinigung von trägerelementen in druckern oder kopierern unter anwendung von magnetfeldern |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1438639A2 true EP1438639A2 (de) | 2004-07-21 |
EP1438639B1 EP1438639B1 (de) | 2009-12-16 |
Family
ID=7703811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02781287A Expired - Lifetime EP1438639B1 (de) | 2001-10-26 | 2002-10-25 | Verfahren und vorrichtung zur reinigung von trägerelementen in druckern oder kopierern unter anwendung von magnetfeldern |
Country Status (4)
Country | Link |
---|---|
US (1) | US7340203B2 (de) |
EP (1) | EP1438639B1 (de) |
DE (2) | DE10152892A1 (de) |
WO (1) | WO2003036393A2 (de) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10213499B4 (de) | 2002-03-26 | 2005-02-03 | OCé PRINTING SYSTEMS GMBH | Vorrichtung zum Transport von Toner bei einer elektrofotografischen Druck- oder Kopiereinrichtung |
DE10246022B3 (de) | 2002-10-02 | 2004-07-22 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum Aufsammeln von magnetisierbaren Trägerteilchen aus einem Gemisch von Tonerteilchen und magnetisierbaren Trägerteilchen |
DE10328857B3 (de) * | 2003-06-26 | 2005-03-17 | OCé PRINTING SYSTEMS GMBH | Hülse zum Transport eines Tonergemischs und Verfahren zum Herstellen einer solchen Hülse |
DE102004024047A1 (de) * | 2004-05-14 | 2005-12-08 | OCé PRINTING SYSTEMS GMBH | Verfahren und Vorrichtung zum Einfärben eines Applikatorelements eines elektrofotografischen Druckers oder Kopierers |
DE102004036159A1 (de) | 2004-07-26 | 2006-03-23 | OCé PRINTING SYSTEMS GMBH | Anordnung und Verfahren zum Einfärben eines Applikatorelementes eines elektrofotografischen Druckers oder Kopierers |
DE102004059532A1 (de) | 2004-12-09 | 2006-06-14 | OCé PRINTING SYSTEMS GMBH | Elektrografische Druck- oder Kopiervorrichtung sowie Verfahren zum Betreiben der Druck- oder Kopiervorrichtung |
JP4860967B2 (ja) * | 2005-09-07 | 2012-01-25 | キヤノン株式会社 | 現像装置 |
DE102006031876A1 (de) | 2006-07-10 | 2008-01-17 | OCé PRINTING SYSTEMS GMBH | Entwicklerstation mit Glättvorrichtung und Verfahren zum Betreiben einer Entwicklerstation |
DE102007019311A1 (de) * | 2007-04-24 | 2008-11-06 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum Reinigen einer mit Tonerteilchen versehenen Trägeroberfläche |
DE102007022972A1 (de) * | 2007-05-16 | 2008-11-20 | OCé PRINTING SYSTEMS GMBH | Vorrichtung zur Toner- Jump- Entwicklung von auf einem Ladungsbildträger aufgebrachten Ladungsbildern bei einer elektrografischen Druckeinrichtung |
DE102007035994A1 (de) * | 2007-08-01 | 2009-02-05 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum Beseitigen von Tonerablagerungen auf der Oberfläche eines Reinigungselements |
DE102007035993A1 (de) | 2007-08-01 | 2009-02-05 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum berührungslosen Ablösen von Tonerteilchen von der Oberfläche eines Tonerträgers |
DE102007060021B4 (de) * | 2007-12-13 | 2012-02-16 | OCé PRINTING SYSTEMS GMBH | Anordnung zur Entfernung von elektrisch geladenem Toner von der Oberfläche einer Toner transportierenden Tonertransportwalze bei einem elektrografischen Druck- oder Kopiergerät |
DE102008005132A1 (de) * | 2008-01-18 | 2009-07-30 | OCé PRINTING SYSTEMS GMBH | Anordnung zur Entfernung von elektrisch geladenem Toner von der Oberfläche einer Toner transportierenden Walze bei einem elektrografischen Druck- oder Kopiergerät |
DE102008012582B4 (de) * | 2008-03-05 | 2011-09-22 | OCé PRINTING SYSTEMS GMBH | Entwicklerstation für ein elektrografisches Druck- oder Kopiergerät |
JP5062012B2 (ja) * | 2008-04-04 | 2012-10-31 | コニカミノルタビジネステクノロジーズ株式会社 | 現像装置、及び画像形成装置 |
DE102008018226B4 (de) * | 2008-04-10 | 2011-11-24 | OCé PRINTING SYSTEMS GMBH | Verfahren zur Ermittlung der Abnutzung eines in einer Entwicklerstation zur Entwicklung von Ladungsbildern eingesetzten Entwicklergemischs bei einem elektrografischen Druckgerät |
DE102008029630B4 (de) | 2008-06-23 | 2015-02-26 | Océ Printing Systems GmbH & Co. KG | Entwicklerstation für ein elektrografisches Druck- oder Kopiergerät |
JP5379865B2 (ja) * | 2008-12-23 | 2013-12-25 | オセ−テクノロジーズ ビーブイ | 画像形成装置を動作する方法、及び、当該方法の適用のための画像形成装置 |
DE102009037735A1 (de) | 2009-08-17 | 2011-02-24 | OCé PRINTING SYSTEMS GMBH | Reinigungseinrichtung für eine Entwicklerwalze bei einem elektrografischen Druck- oder Kopiergerät |
DE102010036840A1 (de) * | 2010-08-04 | 2012-02-09 | OCé PRINTING SYSTEMS GMBH | Entwicklerstation für elektrografische Druck- oder Kopiereinrichtungen |
NL2008319C2 (en) * | 2012-02-20 | 2013-08-21 | Emb Technology B V | Powder purging apparatus and method. |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4142165A (en) * | 1976-03-25 | 1979-02-27 | Ricoh Company, Ltd. | Electrostatic copying machine comprising improved magnetic brush developing-cleaning unit |
US4141165A (en) | 1977-07-26 | 1979-02-27 | Colt Industries Operating Corp. | Double action revolver apparatus and method |
JPS5574575A (en) * | 1978-11-30 | 1980-06-05 | Canon Inc | Cleaning device |
JPS5640862A (en) | 1979-09-11 | 1981-04-17 | Canon Inc | Developing device |
JPS56101168A (en) * | 1980-01-16 | 1981-08-13 | Canon Inc | Developing device |
JPS5792365A (en) * | 1980-11-29 | 1982-06-08 | Toppan Printing Co Ltd | Electrophotographic cleaning device |
US4501484A (en) | 1981-08-19 | 1985-02-26 | Ricoh Company, Ltd. | Photoconductive element cleaning apparatus and residual toner collecting apparatus |
JPS5855960A (ja) | 1981-09-29 | 1983-04-02 | Fuji Xerox Co Ltd | 電子写真複写機の清掃装置 |
US4482244A (en) * | 1981-11-11 | 1984-11-13 | Konishiroku Photo Industry Co., Ltd. | Magnetic brush cleaning device |
GB2114936B (en) | 1981-12-18 | 1985-09-04 | Casio Computer Co Ltd | Magnetic brush cleaning device for image forming appartus |
JPS60229082A (ja) * | 1984-04-27 | 1985-11-14 | Fuji Xerox Co Ltd | 電子複写機の磁気クリ−ニング装置 |
JPS61248074A (ja) | 1985-04-26 | 1986-11-05 | Fuji Xerox Co Ltd | 複写機等のクリ−ニング装置 |
US4771311A (en) * | 1986-09-08 | 1988-09-13 | Xerox Corporation | Development apparatus |
JPS63281186A (ja) | 1987-05-14 | 1988-11-17 | Ricoh Co Ltd | 磁気ブラシクリ−ニング装置 |
US5003354A (en) | 1988-12-03 | 1991-03-26 | Ricoh Company, Ltd. | Method of removing a film from an image carrier of an image forming apparatus |
JP3217074B2 (ja) * | 1990-02-20 | 2001-10-09 | 株式会社リコー | 画像形成装置 |
JPH0470890A (ja) * | 1990-07-12 | 1992-03-05 | Minolta Camera Co Ltd | 磁気ブラシクリーニング方法 |
JP2583661B2 (ja) | 1990-10-26 | 1997-02-19 | 日立金属株式会社 | マグネットロール |
DE4105261C2 (de) | 1991-02-20 | 1994-03-31 | Lignotock Gmbh | Verfahren zum Kaschieren von räumlich verformten Trägerteilen |
JPH05289523A (ja) | 1992-04-07 | 1993-11-05 | Konica Corp | 現像装置 |
JP2000035736A (ja) | 1998-07-17 | 2000-02-02 | Mita Ind Co Ltd | 画像形成機のトナー回収装置 |
JP3455682B2 (ja) | 1998-09-28 | 2003-10-14 | シャープ株式会社 | 現像装置 |
JP2000267397A (ja) | 1999-03-18 | 2000-09-29 | Canon Inc | 画像形成装置 |
-
2001
- 2001-10-26 DE DE10152892A patent/DE10152892A1/de not_active Ceased
-
2002
- 2002-10-25 WO PCT/EP2002/011953 patent/WO2003036393A2/de not_active Application Discontinuation
- 2002-10-25 EP EP02781287A patent/EP1438639B1/de not_active Expired - Lifetime
- 2002-10-25 US US10/493,724 patent/US7340203B2/en not_active Expired - Fee Related
- 2002-10-25 DE DE50214104T patent/DE50214104D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03036393A2 * |
Also Published As
Publication number | Publication date |
---|---|
US20050036806A1 (en) | 2005-02-17 |
DE50214104D1 (de) | 2010-01-28 |
EP1438639B1 (de) | 2009-12-16 |
DE10152892A1 (de) | 2003-05-08 |
WO2003036393A2 (de) | 2003-05-01 |
WO2003036393A3 (de) | 2003-12-24 |
US7340203B2 (en) | 2008-03-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1438639B1 (de) | Verfahren und vorrichtung zur reinigung von trägerelementen in druckern oder kopierern unter anwendung von magnetfeldern | |
DE2842516C3 (de) | Entwicklungseinrichtung für ein elektrophotographisches Kopiergerät | |
DE2257030C3 (de) | MagnetbUrsten-Entwicklungsstation | |
DE3319708C2 (de) | ||
DE3439678C2 (de) | ||
DE2839178C2 (de) | ||
DE2545494C2 (de) | Magnetbürsten-Entwicklungseinrichtung | |
DE3206815C2 (de) | ||
DE3705469C2 (de) | ||
DE2810520C3 (de) | Magnetbürsten-Entwicklervorrichtung | |
DE2901523C2 (de) | Transporteinrichtung für magnetischen Toner | |
DE3148231C2 (de) | ||
DE3301796C2 (de) | Vorrichtung zur Entfernung des Entwicklers von einer photoleitfähigen Fläche | |
DE2736078C3 (de) | Einrichtung zur Entfernung des Toners von einer fotoleitfähigen Oberfläche | |
DE1202138B (de) | Vorrichtung zum Auftragen von ferromagnetischem, einen Farbtoner enthaltendem Entwicklungspulver auf einen Schichttraeger zum Entwickeln eines elektrostatischen Ladungsbildes | |
DE3109214C2 (de) | Gerät zur Entwicklung eines latenten elekrostatischen Bildes | |
DE2954323C2 (de) | Magnetbürsten-Entwicklervorrichtung zum Entwickeln eines elektrostatischen Ladungsbildes | |
DE3413061A1 (de) | Entwicklungsvorrichtung | |
DE3249322C2 (de) | Abstreichvorrichtung für magnetischen Entwickler in einer Magnetbürstenentwicklungseinrichtung | |
DE2737545C3 (de) | Vorrichtung zur Entfernung eines pulverförmigen, magnetischen Entwicklers | |
DE3347214A1 (de) | Entwicklungseinrichtung | |
DE3132252A1 (de) | Elektrofotografisches kopiergeraet mit pulverbilduebertragung | |
DE3117238C2 (de) | Magnetbürstenanordnung in einer Entwicklungsvorrichtung zur Entwicklung von Ladungsbildern auf einem Ladungsbildträger | |
DE3311890A1 (de) | Entwicklungeinrichtung | |
DE69830698T2 (de) | Entwicklungsgerät mit magnetischer Dichtung |
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: 20040414 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MAESS, VOLKHARD Inventor name: SCHULMEISTER, PETER Inventor name: SELINGER, RALF Inventor name: HOELLIG, UWE |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REF | Corresponds to: |
Ref document number: 50214104 Country of ref document: DE Date of ref document: 20100128 Kind code of ref document: P |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20100917 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 50214104 Country of ref document: DE Representative=s name: PATENTANWAELTE SCHAUMBURG, THOENES, THURN, LAN, DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 50214104 Country of ref document: DE Representative=s name: PATENTANWAELTE SCHAUMBURG, THOENES, THURN, LAN, DE Effective date: 20130819 Ref country code: DE Ref legal event code: R081 Ref document number: 50214104 Country of ref document: DE Owner name: OCE PRINTING SYSTEMS GMBH & CO. KG, DE Free format text: FORMER OWNER: OCE PRINTING SYSTEMS GMBH, 85586 POING, DE Effective date: 20130819 Ref country code: DE Ref legal event code: R082 Ref document number: 50214104 Country of ref document: DE Representative=s name: SCHAUMBURG & PARTNER PATENTANWAELTE GBR, DE Effective date: 20130819 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20131025 Year of fee payment: 12 Ref country code: FR Payment date: 20131018 Year of fee payment: 12 Ref country code: DE Payment date: 20131219 Year of fee payment: 12 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP Owner name: OCE PRINTING SYSTEMS GMBH & CO. KG, DE Effective date: 20140513 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E Free format text: REGISTERED BETWEEN 20140904 AND 20140910 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50214104 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 50214104 Country of ref document: DE Representative=s name: SCHAUMBURG & PARTNER PATENTANWAELTE GBR, DE |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20141025 |
|
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: 20150501 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141025 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20150630 |
|
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: 20141031 |