| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 399276000 | Sleeve | 24 |
| 20080260434 | Arrangement and Method for Inking an Applicator Element of an Electrophotographic Printer or Copier - In a method or system where inking in an electrophotographic printer or copier, a magnetic roller is provided having a rotatable magnetic roller sleeve having a circumferential surface to which a two-component mixture comprising toner particles and ferro-magnetic carrier particles adheres. An applicator element has a circumferential surface to be inked with toner particles and past which the two-component mixture adhering to the circumferential surface of the magnetic roller is guided to produce a toner layer on the applicator element. The magnetic roller has a magnetic rotor which comprises magnetic elements and arranged inside the magnetic roller sleeve. A magnetic rotor and the magnetic roller sleeve are moveable relative to one another. | 10-23-2008 |
| 20090010683 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device includes a developing roller and a blade. The developing roller includes: a developing sleeve which rotates while holding two-component developer composed of toner and magnetic carrier on the outer surface having a plurality of grooves extending in parallel to an axis of the rotation; and a magnetic member, provided inside the developing sleeve in such a manner as to be unrotatable, for attracting the two-component developer onto the outer surface of the developing sleeve. The blade is provided outside the rotating sleeve with a gap from the outer surface of the developing sleeve for scraping off a part of the two-component developer on the outer surface of the developing sleeve. Also, the magnetic member includes a magnet for controlling magnetic flux density in the gap to range from 70 mT to 150 mT. This allows preventing image degradation caused by generation of development memory. | 01-08-2009 |
| 20090052951 | DEVELOPING ROLLER, DEVELOPING APPARATUS, AND IMAGE FORMING APPARATUS - A developing roller according to the invention includes a columnar magnet roller, and a cylindrical sleeve that houses the magnet roller. A plurality of fragmented micro recesses is formed on the surface of the sleeve. The micro recesses are arranged dispersively both in an axial direction and in a circumferential direction of the sleeve. | 02-26-2009 |
| 20090060591 | DEVELOPING ROLLER, DEVELOPING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - A developing roller includes a developing sleeve and a magnet roller disposed within the developing sleeve to attract developer to an outer surface of the developing sleeve by magnetic force. The outer surface of the developing sleeve has a plurality of recesses of circular or elliptic shape in plan view regularly or irregularly arranged therein so as not to overlap. | 03-05-2009 |
| 20090110441 | MAGNETIC ROLLER, DEVELOPMENT DEVICE, AND IMAGE FORMING METHOD - A development device configured to develop a latent image with developer including toner and carrier includes a development roller configured to carry the developer. The development roller includes a stationary magnet-fixing member, a plurality of magnets fixed to an interior of the stationary magnet-fixing member to form a plurality of magnetic poles, and a cylindrical rotatable sleeve roller configured to revolve coaxially around the exterior of the magnet-fixing member. Magnetic force distribution of a portion of the plurality of magnetic poles is varied in an axial direction of the development roller at positions corresponding to an image forming area in the axial direction of the development roller, enabling the development device to transport and agitate the developer. | 04-30-2009 |
| 20090148195 | DEVELOPING ROLLER, DEVELOPING APPARATUS, AND IMAGE FORMING APPARATUS - A developing roller includes a cylindrical sleeve that holds developer on a peripheral surface thereof, and a magnet roller being provided in the sleeve and having a plurality of magnetic poles. The sleeve includes a plurality of micro-recesses formed on the peripheral surface thereof, and the plurality of micro-recesses are arranged dispersedly in the axial direction and the circumferential direction of the sleeve. The densities of the micro-recesses in both end portions of the sleeve are larger than the density of the micro-recesses in a central portion of the sleeve. | 06-11-2009 |
| 20090154962 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device visualizing an electrostatic latent image previously formed on the surface of an image carrier as toner image, comprising: a developing roller placed at a position facing the image carrier, carrying a toner on the surface thereof, conveying the toner and flying the conveyed toner onto the surface of the image carrier; and a resin layer coated on the surface of the developing roller, wherein the absolute value of the difference in charge between the toners in the upper and lower layers of the toner layer formed on the developing roller as the toner carried on the developing roller is 6 μC/g or less. | 06-18-2009 |
| 20090245887 | DEVELOPING DEVICE, AND IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE COMPRISING THE SAME - To downsize a developing device in the developing carrier axial direction without generating image concentration irregularities from recirculation of developer in the magnetic roller end regions, an N2 pole and an N3 pole, which are mutually adjacent having the same polarity (N polarity), and which are for generating a magnetic force for removing from a developing sleeve a developer that has passed through a developing region, are provided on a magnetic roller. Magnets of this developing device, which are for generating a magnetic field to displace to the inside in the axial direction magnetic force lines that cause peeling force in the direction of separation from the developing sleeve to act on developer on the developing sleeve, based on the magnetic force of the N2 pole and the N3 pole, and that pass through the axial direction end regions within a developer separation region on the developing sleeve, are provided on the outside of the magnetic roller. | 10-01-2009 |
| 20090245888 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A sleeve constituting a developing roller of a developing device has a cylindrical body with three layers composed of a base layer having rigidity and formed in a mesh-like shape, a filter layer for blocking toner passage, and a conductive layer to which a developing bias voltage is applied, which are arranged in this order from the inside. When a sucking device sucks from an open end of one end portion of the sleeve, an air flow going from the inside of the developing roller through the open end to outside is generated so that a pressure of the internal space of the developing roller becomes smaller compared with the outside. As the peripheral wall has air permeability in its thickness direction, air flows from the outer circumferential portion of the developing roller through the peripheral wall to the inside of the developing roller. | 10-01-2009 |
| 20100158578 | DEVELOPMENT ROLLER, DEVELOPMENT DEVICE, PROCESSING CARTRIDGE AND IMAGE FORMING DEVICE - An image forming device comprises a process cartridge. The process cartridge comprises a development roller. The development roller comprises a magnet roller and a developing sleeve | 06-24-2010 |
| 20100183343 | DEVELOPMENT DEVICE AND IMAGE FORMING APPARATUS - Provided is a development device and an image forming apparatus that realize high image quality with improved decrease in density at high speed development and with reduced occurrence of development hysteresis (ghost) in the hybrid developing method having a plurality of toner carriers, by reducing the decrease in the toner supplying ability to the downstream-side toner carrier, which decrease is caused by the supply of toner to the toner carrier on the upstream side in the rotating direction of the developer carrier. By providing a magnetic pole between main magnetic poles, of the developer carrier, facing the toner carriers, a magnetically raised bristle of developer is moved by a magnetic force, while the developer in which development hysteresis due to supplying toner to the upstream-side toner carrier occurred is conveyed to supply toner to the downstream-side toner carrier, whereby the developer layer is stirred. | 07-22-2010 |
| 20100247165 | DEVELOPING DEVICE, METHOD OF PRODUCING DEVELOPING DEVICE, AND IMAGE FORMING APPARATUS - A developing device includes a magnet roll magnetized with plural magnetic poles including a main magnetic pole, a sleeve in a cylindrical shape which is arranged so as to be opposed to an image holding body, and a supporting frame that stably supports the magnet roll in a manner of restraining the magnet roll from rotating in the tangential direction, and supports the sleeve so as to rotate in the tangential direction around the magnet roll. The magnet roll is so arranged that the main magnetic pole is opposed to the image holding body, and a point on the peripheral face where magnetic flux density of the main magnetic pole in the tangential direction at a position along the peripheral face of the magnet roll is zero is set at a position predetermined with respect to a position where the magnet roll comes most closely to the image holding body. | 09-30-2010 |
| 20110142501 | DEVELOPMENT ROLLER INCLUDING A DEVELOPMENT SLEEVE, SURFACE TREATMENT DEVICE THAT TREATS AN OUTER SURFACE OF THE DEVELOPMENT SLEEVE AND WIRE MEMBER THAT ROUGHENS THE OUTER SURFACE OF THE DEVELOPMENT SLEEVE - A development roller, including a development sleeve disposed near a photo conductive drum, a magnetic roller disposed in the development sleeve, and a supplying device configured to supply a developer including a toner and a magnetic carrier to the photo conductive drum uniformly, the development sleeve having an outer surface on which the developer including the toner and the magnetic carrier is adsorbed by a magnetic force of the magnetic roller. | 06-16-2011 |
| 20110150538 | DEVELOPING DEVICE, PROCESS UNIT AND IMAGE FORMING APPARATUS - Provided is a developing device for developing an electrostatic latent image on an image carrier, the developing device comprising: a housing having an opening; a developing sleeve facing the image carrier through the opening; a magnet roller encased in the developing sleeve and having magnetic poles including (i) a first magnetic pole having a strongest magnetic force of all the magnetic poles and (ii) a second magnetic pole having a magnetic force equal to or larger than a predetermined value and being different from the first magnetic pole; and a positioning member operable to allow the magnet roller to rotate together with the developing sleeve when the magnet roller is in a first rotational position where the first or the second magnetic pole faces an edge of the opening located downstream in a transfer direction of a two-component developer, and to inhibit the rotation of the magnet roller when the magnet roller is in a second rotational position where the first magnetic pole is closest to the image carrier. | 06-23-2011 |
| 20110274471 | DEVELOP ROLLER, DEVELOP UNIT, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - A develop roller includes a magnet roller, and a develop sleeve containing the magnet roller and comprising a plurality of depressions in an elliptic shape regularly arranged with an interval in a longitudinal direction on a surface onto which developer is attracted by a magnetic force of the magnet roller, wherein the depressions are arranged such that a longitudinal direction of the depressions is intersected with the longitudinal direction of the develop sleeve, and a downstream side of the depressions are formed to be deeper than an upstream side in a rotary direction of the develop sleeve. | 11-10-2011 |
| 20120057907 | DEVELOPMENT DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS INCLUDING SAME - A development device including a developer container, a developer bearer, a magnetic field generator, a developer agitator to supply the developer to the developer bearer, and a developer regulator to adjust a layer thickness of the developer carried on the developer bearer. Multiple oval recesses oblique to the axial direction of the developer bearer are formed in the outer circumferential surface of the developer bearer and arranged in a circumferential direction and the axial direction thereof. An upstream inner wall of the recess in the rotational direction of the developer bearer applies a force to the developer as the developer bearer rotates, and an angle between a long axis of the recess and the axial direction is set so that the force applied by the upstream inner wall of the recess has a component in a direction substantially identical to the developer conveyance direction of the developer agitator. | 03-08-2012 |
| 20130108328 | IMAGE FORMING APPARATUS | 05-02-2013 |
| 20140356031 | ROLLER, DEVELOPING ROLLER, DEVELOPING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - A roller includes a cylindrical body having openings on both ends thereof and a press-fit member fitted in at least one of the openings of the cylindrical body with an outer circumferential face thereof in contact with an inner face of the cylindrical body. The outer circumferential face of the press-fit member is grooved obliquely to an axis of the cylindrical body, and the inner face of the cylindrical body is smooth at least in a portion that contacts the outer circumferential face of the press-fit member. | 12-04-2014 |
| 20150104220 | DEVELOPING APPARATUS - A developing apparatus includes a sleeve for carrying a developer including toner and magnetic carrier, the sleeve having a plurality of grooves extending in a longitudinal direction; a magnet provided inside the sleeve, a non-magnetic regulating member, provided spaced from the sleeve, wherein an amount M/S (mg/mm | 04-16-2015 |
| 20150104221 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device includes a developing roller. The developing roller includes a magnetic roller configured to have multiple magnetic poles in a circumferential direction thereof and a roller-shaped developing sleeve sheathed on the magnetic roller, and supplies magnetic toner to a photosensitive drum. Further, the developing sleeve is configured such that a surface of an image region thereof, which is located in an intermediate portion thereof in a rotation axis direction thereof and which supplies the magnetic toner to the photosensitive drum, is coated with a non-magnetic material, and such that surfaces of non-image regions thereof, which are located at opposite ends thereof in the rotation axis direction and which supply no magnetic toner to the photosensitive drum, are coated with a magnetic material. | 04-16-2015 |
| 20150338780 | IMAGE FORMING APPARATUS - An image forming apparatus includes: a developer carrying member (sleeve) including a magnet and grooves; and an image bearing member (drum). The electrostatic image on the drum is developed with a developer. When a linear speed of the sleeve is Vs, a linear speed of the drum is Vd, a peripheral speed ratio of the sleeve to the drum is α=Vs/Vd, a radius of the sleeve is Rs, a radius of the drum is Rd, a distance of a rectilinear line connecting a most upstream point and a most downstream point in the developing region with respect to the circumferential direction is Lnip, a pitch of the grooves of the sleeve is p, and an arbitrary natural number is n, the following relationship is satisfied: | 11-26-2015 |
| 20150362864 | IMAGE FORMING APPARATUS - An image forming apparatus, comprising:
| 12-17-2015 |
| 20160091831 | End Sealing and Magnetic Field Truncation of a Magnetic Roll of a Dual Component Development Electrophotographic Image Forming Device - A developer unit according to one example embodiment includes a housing having a reservoir for storing a developer mix that includes toner and magnetic carrier beads. A magnetic roll includes a stationary core and a sleeve positioned around the core that is rotatable relative to the core. The stationary core includes at least one permanent magnet having circumferentially spaced magnetic poles. An upper and a lower magnetically permeable metal shunt are positioned at each axial end of the magnetic roll. Each upper shunt and each lower shunt is positioned axially outboard of the core and in close proximity to the outer surface of the sleeve. | 03-31-2016 |
| 20160154343 | Magnetic Roll for a Dual Component Development Electrophotographic Image Forming Device | 06-02-2016 |
