| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 399274000 | Regulating (e.g., doctor) | 35 |
| 20110206420 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device and an image forming apparatus capable of suppressing occurrence of development hysteresis and moving a developer on a chute without being retained is provided. The developing device provides a chute that guides a two-component developer regulated by a regulating member in the direction separating from a developing roller. The chute is composed of a rectangular thin plate made of non-magnetic austenitic stainless alloy, and a tip part that is one end part in a short side direction thereof is provided so as to face a surface of the developing roller. The tip part is transformed to a processed induced martensitic phase to be made ferromagnetic, and subjected to magnetic field orientation in an area facing the surface of the developing roller so as to form a repulsive magnetic field. | 08-25-2011 |
| 20130084108 | DEVELOPMENT DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A development device includes a developer carrier; a layer-regulating rotating member that faces the developer carrier with a gap therebetween and rotates in a direction following the rotation of the developer carrier while regulating the thickness of a layer of developer on the developer carrier; a development controller that controls, during development, the developer carrier and the layer-regulating rotating member to rotate at respective predetermined speeds and develops an electrostatic latent image on an image carrier with the developer; and a discharge controller that controls, while development is stopped, the developer carrier to rotate at a predetermined speed while controlling the layer-regulating rotating member to rotate at a speed that changes intermittently such that the amount of developer passing the layer-regulating rotating member changes and any foreign matter and aggregates in the developer are discharged together with the layer of the developer whose thickness is changed on the developer carrier. | 04-04-2013 |
| 20120163878 | DEVELOPING DEVICE - A developing device includes a developing sleeve for carrying a developer containing a magnetic carrier and a non magnetic toner; a magnet, provided in the sleeve and including a plurality of magnetic poles disposed along a circumferential direction of the sleeve, for carrying the developer on the sleeve; and a regulating member, provided opposed to the sleeve with a predetermined spacing in a region in which the magnetic poles different in polarity are adjacent to each other, for regulating an amount of the developer carried on the sleeve. The magnetic poles are disposed so that a circumferential direction component of a magnetic force acting on the magnetic carrier contacting at least a part of an upstream regulating surface of the regulating member with respect to the circumferential direction of rotation of the sleeve is opposite from the circumferential direction of the rotation. | 06-28-2012 |
| 20130101320 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device includes a developer transport body having a rotating outer peripheral surface, a magnet member having a plurality of magnetic poles, a regulation member that regulates passage of the developer supplied on the outer peripheral surface, and an introduction member having an opposing face opposing the outer peripheral surface to form an introduction space. A regulation-assist magnetic pole, of the magnetic poles, is provided at a position shifted from a position opposing the regulation member toward an upstream side in a rotating direction of the developer transport body. At least an upstream end of the opposing face is located on a virtual line obtained by translating a tangent line to the developer transport body at a position opposing the regulation member to an end of the regulation member opposing the developer transport body or located closer to the outer peripheral surface than the virtual line. | 04-25-2013 |
| 20080298848 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A developing device having an improved regulating member to regulate the thickness of a developing agent layer and consequently, achieving easy fabrication, reduced fabrication costs and/or reduction in the size of the developing device, and an image forming apparatus having the same, is described. The developing device includes a developing container, which contains a developing agent therein, and which has an opening. A developing roller is installed at the opening of the developing container. A regulator regulates the thickness of a developing agent layer on an outer surface of the developing roller. The regulator includes a main regulating member, which maintains a first distance between an end of the main regulating member and the outer surface of the developing roller, and a preliminary regulating member integrally formed with the developing container at a position ahead of the main regulating member along the rotating direction of the developing roller. The preliminary regulating member maintains a second distance between an end of the preliminary regulating member and the outer surface of the developing roller, the second distance being larger than the first distance. | 12-04-2008 |
| 20080267672 | DEVELOPING DEVICE, IMAGE SUPPORTER UNIT, AND IMAGE FORMATION APPARATUS - A developing device includes: a developer supporter that includes: a magnet member that has a plurality of magnetic poles; and a cylinder member; and a thickness regulation member wherein, of the plurality of the magnetic poles, a magnetic pole, which is placed at a position nearest to the thickness regulation member downstream in a rotation direction of the cylinder member from the thickness regulation member, has a maximum position of a normal magnetic flux density distribution, and the maximum position is placed outside the area of angle α downstream in the rotation direction of the cylinder member from the thickness regulation member, and wherein the diameter of the cylinder member is D, the projection width is W in a case where the thickness regulation member is projected onto the surface of the cylinder member, and the angle α is 180×W/(D×π). | 10-30-2008 |
| 20080247786 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A disclosed developing device includes a developer carrier including a developing sleeve and a magnetic roller provided inside the developing sleeve. The magnet roller includes a regulating magnetic pole and a pump-up magnetic pole that have different polarities from each other. Among an entire region of the moving surface of the developing sleeve in the surface movement direction, a maximum pump-up magnetic force position where the pump-up magnetic force of the pump-up magnetic pole is maximum faces an upstream position with respect to a supplying position at which the developer is supplied from a supplying screw to the developing sleeve. | 10-09-2008 |
| 20110188898 | MOVABLE METERING SKIVE FOR A DEVELOPMENT STATION OF A REPRODUCTION APPARATUS - A magnetic brush development station for a reproduction apparatus has a housing forming, at least in part, a reservoir for developer material; a developer roller mounted within the housing for delivering developer material to a dielectric support member in a development zone; a transport mechanism for transporting developer material from the reservoir to the developer roller; a metering skive for establishing a developer material metering gap; and a mechanism for selectively moving the metering skive to an operative position relative to the developer roller and to a position remote from the developer roller, wherein a build up of contamination at the metering gap between the metering skive and the developer roller can be substantially prevented. A method of removing a skive blockage from a metering skive in a magnetic brush developer station is also disclosed. | 08-04-2011 |
| 20090142106 | FASTENING STRUCTURE, BLADE STRUCTURE, DEVELOP UNIT, AND IMAGE FORMATION APPARATUS - A fastening structure which fixes a doctor blade to a holder is provided, which includes a cylindrical portion provided on one surface of the holder with which a doctor blade is overlapped, a through hole having an inner diameter larger than an outer diameter of the cylindrical portion and penetrating through the doctor blade. In the fastening structure, while the cylindrical portion is inserted through the through hole with a gap between an outer circumference of the cylindrical portion and an inner circumference of the through hole, an end portion of the cylindrical portion is pressed to be expanded in an outer circumferential direction and then bent towards the doctor blade, to thereby fix the doctor blade to the holder by supporting it between the end portion and the one surface of the holder. | 06-04-2009 |
| 20120107022 | CONTROLLING ELECTROPHOTOGRAPHIC DEVELOPER ENTERING TONING ZONE - A method of controlling the amount of developer entering a toning zone in an electrophotographic printer for printing an image on a moving receiver includes providing a rotatable development member for selectively supplying developer from a developer supply to the photoreceptor, the developer including toner particles and carrier particles. A photoreceptor is arranged with respect to the rotatable development member to receive toner and apply the received toner to the moving receiver to print the image. A skive is brought into proximity with the surface of the development member using an electromagnetic actuator. | 05-03-2012 |
| 20090257788 | DEVELOPING APPARATUS AND ELECTROPHOTOGRAPHIC IMAGE-FORMING APPARATUS - A developing apparatus is provided which can suppress a fluctuation in image density in a discontinuous printing mode provided with a pause period. The developing apparatus includes a developer for developing an electrostatic latent image on a photosensitive drum, a developer bearing member for carrying and conveying the developer and a developer layer thickness-regulating unit placed close to the developer bearing member for regulating the amount of the developer carried and conveyed by the developer bearing member, the developer layer thickness-regulating unit being. As the developer, a negatively chargeable, one-component, magnetic toner is used having magnetic toner particles containing a binder resin and a magnetic iron oxide particle, and has a specific saturation magnetization, specific weight-average particle diameter and specific composition. The developer bearing member includes a surface layer containing a binder resin, a quaternary ammonium salt, graphitized particles, and conductive, spherical resin particles, and has a specific surface shape. | 10-15-2009 |
| 20110170915 | TWO-COMPONENT DEVELOPING METHOD AND DEVELOPER USED THEREFOR - A two-component developing method, including regulating a two-component developer borne on a developer bearer with a doctor blade; and transferring the regulated two-component developer to the developer bearer to develop a latent image on an image bearer, wherein the two-component developer includes a pulverized toner having a volume-average particle diameter of from 3.0 to 6.0 μm, including particles having a particle diameter not greater than 4.0 μm in an amount not less than 30% by number, and including particles having a particle diameter not greater than 2.0 μm in an amount not greater than 10% by number, and wherein the doctor blade has a surface regulating the developer at an upstream side relative to a rotational direction of the developer bearer, which has a surface roughness Ra not greater than 0.2 μm. | 07-14-2011 |
| 20090297229 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member for bearing an electrostatic latent image; a rotatable developer carrying member, provided opposed to the image bearing member, for carrying a developer including toner and a carrier to a position where the developer carrying member is opposed to the image bearing member; a regulating member for regulating the amount of the developer to be carried on the developer carrying member; a driving device for rotating the developer carrying member; a controller for controlling the driving device to execute, at the time of end of image formation, a plurality of continuous operations each including acceleration of a rotational speed of the developer carrying member and deceleration thereof following the acceleration. | 12-03-2009 |
| 20100111575 | TRIMMING SYSTEM FOR STABILIZING IMAGE QUALITY FOR HIGH PERFORMANCE MAGNETIC BRUSH DEVELOPMENT - A device for metering developer material to a predefined developer material bed height on a donor member, including a trim bar being mounted a predefined spacing from the donor member; and a magnetic member positioned adjacent and along the length of the trim bar, the magnetic member coacting with the trim bar to obtain the predefined developer material bed height on the donor member. | 05-06-2010 |
| 20080310886 | DEVELOPER REGULATING APPARATUS AND DEVELOPING APPARATUS - A developer regulating apparatus including: a flexible sheet member, which regulates a thickness of a developer layer on a developing roller; and a holding member having wall surfaces for holding the sheet member in a curved state, wherein when the sheet member is not pressed by the developing roller, an angle of circumference of an arc of the sheet member is not larger than 180 degrees, a perpendicular bisector of a chord corresponding to the arc when the sheet member is pressed by the developing roller is provided downstream in a rotation direction of the developing roller with respect to a normal line of a surface of the developing roller which is parallel to the perpendicular bisector, and a sheet member holding line of the wall surface of the holding member upstream in the rotation direction is provided coplanar with the normal line or upstream of the normal line. | 12-18-2008 |
| 20090175661 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - This invention, by a layer thickness restricting member, restricts a layer thickness of a developer born on a peripheral surface of a developer bearing member which feeds the developer at a developing region in a developer feeding direction which is opposite to an electrostatic latent image feeding direction, at a position upstream of the developing region in the developer feeding direction. | 07-09-2009 |
| 20110142500 | DEVELOPING DEVICE, DEVELOPING METHOD AND IMAGE FORMING APPARATUS - According to an embodiment, a developing device includes: a rotatable developing roller which has plural magnets forming magnetic poles; and a regulating member which includes a non-magnetic plate and a magnetic plate extending parallel to an axial direction of the developing roller and arranged facing the developing roller to regulate thickness of a developer layer on the developing roller, the magnetic plate being attached to a central part in the longitudinal direction of the non-magnetic plate to form a magnetic chain between the developing roller and the regulating member stronger at the central part than an end part. | 06-16-2011 |
| 20090097887 | IMAGE FORMING APPARATUS - An image forming apparatus includes a plurality of vibration members configured to vibrate a regulating member that regulates a developer layer thickness on a developer bearing member, and a control unit that can execute a vibration mode which vibrates the plurality of vibration members during different periods so that the plurality of vibration members do not vibrate simultaneously when an image is not being formed. | 04-16-2009 |
| 20110229216 | DEVELOPMENT DEVICE AND IMAGE FORMING DEVICE - A developing device that includes a developing member, a cylindrical layer thickness regulation member and a guide surface. The developing member retains a developer supplied from a developer accommodation portion and, while rotating, supplies the developer to an image-bearing body. The layer thickness regulation member comes up against the developer retained at the surface of the developing member and regulates a layer thickness of the developer. The guide surface guides developer that has been rendered excess by the layer thickness being regulated by the layer thickness regulation member toward the developer accommodation portion. The guide surface is provided such that an angle that is formed between the guide surface and a tangent of the layer thickness regulation member at a point of intersection of a line of extension of the guide surface with the layer thickness regulation member is at least 90°. | 09-22-2011 |
| 20110170916 | DEVELOPING APPARATUS - A repulsive magnetic field is formed in a section immediately upstream of a regulating blade, so that generation of a developing-agent stationary layer is suppressed or eliminated. Accordingly, a developing apparatus capable of stably maintaining the layer thickness of developing agent conveyed to a developing area for a long time is provided. | 07-14-2011 |
| 20110052271 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - An anti-accumulation section is provided at a section where an inner surface of a developer container abuts a surface of a doctor blade on an upstream side of a rotation direction of a developing roller. An angle between a surface of the anti-accumulation section facing the developing roller and the surface of the doctor blade on the upstream side of the rotation direction of the developing roller is set to be larger than an angle between a circle concentric with a cross section of the developing roller perpendicular to an extending direction of the developing roller and the surface of the doctor blade on the upstream side of the rotation direction of the developing roller at the section where the surface of the anti-accumulation section facing the developing roller and the surface of the doctor blade on the upstream side of the rotation direction of the developing roller abut. This realizes, with a simple configuration, a developing device capable of forming images of high quality without nonuniform development. | 03-03-2011 |
| 20080240794 | Printing machine incorporating plastic metering roller - A metering roller for a printing machine utilising a high viscosity ink. The metering roller has an axle, a cylindrical roller body formed on the axle and an annular surface layer. The annular surface layer has a surface of a low surface energy and a pattern of a plurality of ink receiving recesses formed in the annular surface layer. The annular surface layer can be integral with the cylindrical roller body or separate from it and can be a plastic material. The annular surface layer has a surface energy in the range of from 18 to 46 dynes/cm. | 10-02-2008 |
| 20090324299 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device for developing an electrostatic latent image formed on an photoreceptor drum with a dual-component developer, includes: a developing hopper for storing the developer; an agitation roller for conveying the developer while agitating; a developing roller which supplies the developer to a developing area located opposing the photoreceptor drum; a layer thickness-regulating member for regulating the layer thickness of the developer being conveyed by the developing roller; a flow-guide plate for flowing down the surplus developer that was rejected to a position away from the layer thickness-regulating member; a multiple number of partitioning ribs arranged upright on the flow-guided plate for flowing down the surplus developer in a predetermined direction whilst diffusing the developer with respect to the longitudinal direction of the developer roller; and a downflow direction control mechanism for controlling the downflow direction of the surplus developer regulated by the partitioning ribs. | 12-31-2009 |
| 20090279922 | DEVELOPER STATION WITH SMOOTHING DEVICE AND METHOD FOR OPERATING A DEVELOPER STATION - In a developer station for a printer or copier, a rotating developer roller is provided having a mixture of toner particles and ferromagnetic carrier particles accumulated on a surface of the developer roller as a layer, and a transfer zone at which the toner particles are transferred away from the developer roller. A smoothing device is provided with a smoothing element arranged before the transfer zone, the smoothing element being charged with a mechanical tension in a rest state of the developer roller and designed such that it exerts a force on and over an entire width of the layer formed by the mixture of the toner particles and the carrier particles present on the developer roller and smoothes the layer before the transfer of the toner particles. Within the developer roller at least one magnet is provided. The smoothing element comprises a magnetizable material attracted toward said at least one magnet to create said mechanical tension. | 11-12-2009 |
| 20120039638 | Development device and image forming apparatus including development device - A development device using a developing agent including a toner and a carrier, in which the development device includes a development roller that attaches the developing agent to a circumference surface of the development roller and transfers the developing agent to a development region in which the development roller faces a photo receptor; and a regulation portion to regulate an amount of the developing agent transferred to the development region, where the regulation portion includes first, second, and third regulation portions sequentially disposed in the stated order in an opposite direction to a rotational direction of the development roller, where the first, second, and third regulation portions are respectively spaced apart from the circumference surface of the development roller by first, second, and third intervals, the second interval is greater than the third interval, and the third interval is narrowed in the rotational direction of the development roller. | 02-16-2012 |
| 20120099905 | DEVELOPING APPARATUS AND IMAGE FORMING APPARATUS - A developing apparatus in which one sleeve is swingable includes a first magnetic field generating member inside a first developer bearing member, a second magnetic field generating member inside a second developer bearing member, and a positioning unit configured to perform positioning of a swinging connecting member in the peripheral direction or to perform positioning of the swinging connecting member in the peripheral direction through connection thereto. | 04-26-2012 |
| 20110064484 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH SAME - A developing device includes a developer storing portion, a developer carrying body, a first regulating member having a first regulating surface regulating a layer thickness of the developer on the developer carrying body, a second regulating member having a second regulating surface that is set so as to gradually become apart from the developer carrying body toward the upstream side with respect to the rotation direction of the developer carrying body to regulate an amount of the developer conveyed to the first regulating surface, the second regulating surface being arranged with a step formed between the second regulating surface and the first regulating surface, and a sheet member so attached to the second regulating surface as to cover at least a portion of the step between the first regulating surface and the second regulating surface. | 03-17-2011 |
| 20110064485 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS COMPRISING SAME - A developing device includes: a developer carrying body which supplies developer to a predetermined image carrying body; a layer thickness regulating member which is made of a magnetic material, which has a layer thickness regulating face opposing the developer carrying body so as to form a predetermined gap between the layer thickness regulating face and the developer carrying body and regulating the layer thickness of the developer on the developer carrying body, and which forms a magnetic path between the layer thickness regulating face and the developer carrying body; an installation member on which the layer thickness regulating member is installed; and an elastic sheet member arranged in the gap in a state of contact with a surface of the developer carrying body. | 03-17-2011 |
| 20120155928 | DEVELOPING DEVICE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS EMPLOYING THE SAME - An image forming apparatus including a developing device includes: a housing for housing a developer that includes a carrier and a toner; a development sleeve that is installed rotatably in the housing and is cylindrical and; and a layer regulator installed in the housing in such a way that an end of the layer regulator is spaced apart from an outer circumference surface of the development sleeve, wherein the layer regulator has a stacked structure including a non-magnetic material layer as a substrate, a resin layer for aiding electrifying of the toner by the carrier, and a magnetic material layer for regulating uniformity of the developer. Thus, the developing device is fabricated by using a simple process with sustainable straightness of the layer regulator even when the layer regulator operates and without formation of a step or a space between a magnetic material and a non-magnetic material. | 06-21-2012 |
| 20100008702 | DEVELOPING UNIT AND IMAGE FORMING APPARATUS EMPLOYING THE SAME - A developing unit to develop an image on an image support body and an image forming apparatus employing the same. The developing unit includes a housing to contain a developer having a toner and a carrier, a magnetic cylinder including a catch pole to pick up the developer in the housing and a main pole arranged to face the image support body and to hold the carrier of the developer, a sleeve installed to rotate on the magnetic cylinder and on which a developer layer is formed, a thickness regulating member to regulate a thickness of the developer layer, and a width regulating member to regulate a width of the developer layer on the sleeve. | 01-14-2010 |
| 20120082487 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device includes a developing roller; a housing that retains the developing roller such that the developing roller has exposed and unexposed portions, end portions of the housing having first faces curved along the unexposed portion and second faces facing inward; a layer-thickness regulating member having an edge near the developing roller; a first magnet including a first magnetic pole that attracts the developer and a second magnetic pole located downstream of the first magnetic pole and upstream of the exposed portion in a rotational direction of the developing roller, the second magnetic pole having a magnetic force of about 60 mT or less; second magnets retained on the first faces; and magnetic plates retained on the second faces and arranged such that developer chains formed thereon at the downstream ends in the rotational direction extend to positions upstream of the edge of the layer-thickness regulating member. | 04-05-2012 |
| 20130017002 | DEVELOPER LAYER RESTRICTION MEMBER AND DEVELOPMENT APPARATUSAANM Yoshikawa; TadanobuAACI Toride-shiAACO JPAAGP Yoshikawa; Tadanobu Toride-shi JP - The typical configuration of the present invention includes a developer layer restriction member ( | 01-17-2013 |
| 399275000 | Having stationary magnet | 3 |
| 20090154961 | DEVELOP UNIT, PROCESS CARTRIDGE, AND IMAGE FORMATION APPARATUS - A develop unit is configured to include a developer roller having a developer sleeve and a magnetic roller with a magnetic pole, a supply path formed in parallel with an axial direction of the developer roller, a supply screw supplying the developer to the developer roller, and a first bulkhead forming the supply path. In the developer unit, the magnetic pole is disposed so that a normal line through a maximum magnetic flux density point in a circumferential direction coincides with a tangent line to an upper portion of the supply screw in a rotary direction, the maximum magnetic flux density point being a point at which a density of a magnetic flux from the magnetic pole is maximum on an outer surface of the developer sleeve. | 06-18-2009 |
| 20090035026 | DEVELOPING DEVICE AND IMAGE FORMING DEVICE EQUIPPED WITH SAME - A developing device is disclosed which includes a fixed magnet roller | 02-05-2009 |
| 20090074473 | DEVELOPING AGENT REGULATING MEMBER, DEVELOPMENT UNIT AND IMAGE FORMING APPARATUS USING SAME, AND METHOD OF MANUFACTURING DEVELOPING AGENT REGULATING MEMBER - A developing agent regulating member and a method of manufacturing the same is provided. The method includes providing a non-magnetic member and a magnetic member. The non-magnetic member and the magnetic member are fixed together by caulking such that an end face of the non-magnetic member and an end face of the magnetic member are substantially aligned with each other, and such that the non-magnetic member and the magnetic member are closely pressed together in order to reduce a gap between the non-magnetic member and the magnetic member. The end face of the non-magnetic member and the end face of the magnetic member are polished so as to prepare the regulating face of the developing agent regulating member by making the end face of the non-magnetic member and the end face of the magnetic member flush. | 03-19-2009 |
