Patent application number | Description | Published |
20090180796 | Image Forming Apparatus, A Developing Device And An Image Forming Method - An image forming apparatus, includes: a latent image carrier that carries an electrostatic latent image; a housing that stores toner inside; a toner carrier roller that is shaped approximately like a cylinder, is mounted to the housing rotatably about a rotational axis, rotates while carrying toner on a surface thereof to convey the toner to an opposed position facing the latent image carrier outside the housing, and is provided, on the surface thereof, with a plurality of convex sections which are regularly arranged in an axial direction parallel to the rotational axis and in a circumferential direction orthogonal to the axial direction and parallel to a circumferential surface of the toner carrier roller and a concave section which surrounds the convex sections; a seal member that is arranged in abutting contact with the surface of the toner carrier roller moving from the outside the housing toward the inside the housing at a position downstream of the opposed position in a rotation direction of the toner carrier roller to prevent toner leakage from the inside the housing; and a moving mechanism that relatively moves the toner carrier roller relative to the seal member in the axial direction. | 07-16-2009 |
20090185819 | Developing Device, an Image Forming Apparatus and an Image Forming Method - A developing device, includes: a housing that stores toner inside; a toner carrier roller that is shaped approximately like a cylinder, is mounted to the housing rotatably about a rotational axis, rotates while carrying the toner on a surface thereof to convey the toner to outside of the housing, and is provided, on the surface thereof, with a plurality of convex sections which are regularly arranged and a concave section which surrounds the convex sections, the convex sections including top surfaces that coincide with a part of a curved surface of single cylinder and have electrical conductivity; and a seal member that is arranged in abutting contact with the surface of the toner carrier roller moving from the outside the housing toward the inside the housing at a position downstream of the opposed position in a rotation direction of the toner carrier roller to prevent toner leakage from the housing, a contact surface of the seal member being made of a material located at a position to charge the toner with a polarity opposite to its charging polarity in triboelectric series. | 07-23-2009 |
20090185838 | Method of Manufacturing Toner Carrier Roller, Developer Apparatus, and Image Forming Apparatus - A method of manufacturing a toner carrier roller that is shaped like a cylinder on an outer circumferential surface of which concave and convex sections for carrying toner are provided, includes: preparing a roller base member which is shaped like a cylinder; forming helix-like first grooves on the outer circumferential surface of the roller base member; and forming helix-like second grooves, which cross the first grooves, on the outer circumferential surface of the roller base member, wherein a pitch ratio of the first grooves and the second grooves is a non-integer ratio. | 07-23-2009 |
20090290900 | Developing Device, Image Forming Apparatus, and Method of Manufacturing Developing Device - A developing device includes: a housing that stores toner therein; a toner carrying roller that is attached to the housing by a shaft and is rotated in a predetermined rotation direction while carrying charged toner on a surface of the toner carrying roller to transport the toner to the outside of the housing; and a seal member that extends in a direction of a rotation axis of the toner carrying roller and has one end fixed to the housing and the other end in contact with the surface of the toner carrying roller to prevent the toner from leaking out of the housing, wherein a plurality of convex portions having top surfaces constituting a part of the same cylindrical surface are formed on the surface of the toner carrying roller, and at least a part of the seal member in contact with the surface of the toner carrying roller is made of a material having a contact angle of 105° or more with respect to water. | 11-26-2009 |
20090297231 | Image Forming Apparatus and Image Forming Method - An image forming apparatus includes an image carrier that carries an electrostatic latent image on a surface thereof, a toner carrying roller that is disposed to face the image carrier and rotates in a predetermined rotation direction with charged toner carried on a surface thereof so as to transport the toner in an opposing position for facing the image carrier, and a bias applying unit that develops the electrostatic latent image with the toner by applying an AC voltage as a developing bias to the toner carrying roller. In addition, periodical concavo-convexes that are formed of a plurality of convex portions arranged at a constant pitch in a circumferential direction and concave portions that surround the plurality of convex portions are formed on the surface of the toner carrying roller. When the arrangement pitch is denoted by P, the frequency of the developing bias is denoted by F, and the moving speed of the surface of the toner carrying roller for the circumferential direction is denoted by V, a quotient acquired from dividing V by F is a value acquired from multiplying P by a natural number or an approximately natural number. | 12-03-2009 |
20100239326 | DEVELOPING DEVICE, IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - A developing device, an image forming apparatus and an image forming method are disclosed. The developing device includes a housing that stores toner therein; a toner carrying roller that has a plurality of convex portions and concave portions surrounding the convex portions are formed on the surface of the toner carrying roller; and a conductive regulation blade having a free end comes in contact with the surface of the toner carrying roller. The toner includes a conductive external additive as an external additive. The toner carrying roller carries both contact toner which is in direct contact with the surface of the toner carrying roller and non-contact toner which is not in direct contact with the surface of the toner carrying roller, on the concave portion. The regulation blade is applied with a regulation bias voltage of the same polarity as a normal charge polarity of the toner. | 09-23-2010 |
20100239327 | DEVELOPING DEVICE, IMAGE FORMING DEVICE AND IMAGE FORMING METHOD - A development device includes a housing having toner housed therein; a toner carrying roller that has a plurality of convex portions and concave portions surrounding the convex portions, formed on a surface thereof; and a conductive restriction blade in which a free end or an adjoining region adjacent to the free end abuts the surface of the toner carrying roller, thereby restricting the amount of the toner carried on surface of the toner carrying roller, wherein the toner has an external additive including a metal oxide, the restriction blade is applied with a restriction bias voltage of the same polarity as the regular electrification polarity of the toner, and a gap between the front end of the free end and the convex portion of the toner carrying roller is smaller than a volume average particle diameter of the toner. | 09-23-2010 |
20100239328 | DEVELOPING APPARATUS, IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND TONER - A developing apparatus includes: a housing which contains toner; a toner supporting roller; and a regulating blade, wherein bias voltage is applied to the regulating blade, the toner includes, an insulating external additive and an electrically-conductive external additive, satisfies any of the following first to third conditions, the first condition: a volume average grain diameter of the electrically-conductive external additive is larger than a volume average grain diameter of the insulating external additive, the second condition: a volume average grain diameter of the electrically-conductive external additive is larger than a volume average grain diameter of the insulating external additive in which coverage in the toner is higher than that of the electrically-conductive external additive, and the third condition: coverage of the electrically-conductive external additive in the toner is higher than coverage of the insulating external additive that is larger in volume average grain diameter than the electrically-conductive external additive. | 09-23-2010 |
20100247187 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes: a latent image carrier which circumferentially rotates in a predetermined rotational direction; a lubricant applying unit which applies a lubricant on a surface of the latent image carrier in a predetermined application position; a developing unit which adheres a toner including an additive having an abrasion effect onto the surface of the latent image carrier on which the lubricant is coated to form a toner image, in a development position located on a downstream side of the application position in the rotational direction; and a conductive blade which cleans and removes the toner on the surface of the latent image carrier in contact with the surface of the latent image carrier, and charges the surface of the latent image carrier, in a cleaning and charging position located on an upstream side of the development position in the rotational direction. | 09-30-2010 |
20100248129 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes: a latent image carrier which circumferentially rotates in a predetermined rotational direction; a conductive blade which cleans a surface of the latent image carrier by being in contact with the surface of the latent image carrier, and charges the surface of the latent image carrier at a first electric potential having the same polarity as normal charged polarity of a toner according to application of direct current voltage having the same polarity as the normal charged polarity of the toner, in a predetermined cleaning and charging position; and a charger which provides electric charge having reverse polarity to the normal charged polarity and adjusts an electric potential of the surface of the latent image carrier to a second electric potential, in a secondary charging position located on a downstream side of the cleaning and charging position in the rotational direction. | 09-30-2010 |
20100248131 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - Provided is an image forming apparatus including: a latent image carrier; a lubricant applying unit configured to bring a conductive contact member into contact with a surface of the latent image carrier; a development unit configured to attach toner to the surface of the latent image carrier; and a conductive blade brought into contact with the surface of the latent image carrier at a cleaning position, wherein a bias is applied to at least one of the conductive contact member and the conductive blade such that the surface of the latent image carrier is electrified, and wherein, as the durability of the conductive blade is prolonged, a ratio of the electrification of the surface of the latent image carrier by the conductive blade and the electrification of the surface of the latent image carrier by the conductive contact member is changed. | 09-30-2010 |
20100261109 | TONER, METHOD FOR FORMING IMAGE, AND IMAGE FORMING APPARATUS - A toner includes toner base particles containing at least a binder resin, a coloring agent, and a release agent; and alumina fine particles whose phase angle (θ) is |80°| or less at an alternating current frequency of 1 to 10 kHz in an alternating current impedance method. | 10-14-2010 |
20100261111 | TONER, IMAGE FORMING METHOD AND IMAGE FORMING APPARATUS - A toner includes at least a binder resin, a colorant, and a release agent. The toner contains base toner particles having an average volume particle size of 2 μm to 6 μm, small particle silica having an average volume particle size of 7 nm to 15 nm, large particle silica having an average volume particle size of 50 nm to 400 nm, small particle transition alumina having an average volume particle size of 7 nm to 20 nm, and large particle α-type alumina having an average volume particle size of 50 nm to 400 nm or large particle cerium oxide having an average volume particle size of 50 nm to 400 nm. | 10-14-2010 |
20100261112 | TONER, METHOD FOR FORMING IMAGE, AND IMAGE FORMING APPARATUS - A toner includes toner base particles containing at least a binder resin, a coloring agent, and a release agent and having a volume-average particle size of 2 to 6 μm; at least two types of silica each having a different average particle size; at least one type of electron-conductive oxide semiconductor fine particles selected from titania, transition alumina, zinc oxide, and tin oxide; and at least one type of ion-conductive oxide semiconductor fine particles selected from cerium oxide and stabilized zirconia. | 10-14-2010 |
20100261113 | TONER, METHOD FOR FORMING IMAGE, AND IMAGE FORMING APPARATUS - A toner includes toner base particles containing at least a binder resin, a coloring agent, and a release agent and having a volume-average particle size of 2 to 6 μm; a small particle size silica having an average particle size of 7 to 15 nm; a large particle size silica having an average particle size of 50 to 400 nm; and a small particle size transition alumina obtained by a dawsonite method and having an average particle size of 7 to 20 nm. | 10-14-2010 |
20110193900 | LIQUID EJECTING APPARATUS AND CLEANING METHOD IN LIQUID EJECTING APPARATUS - The liquid ejecting apparatus includes nozzles which eject ink, an ink flow path which supplies ink from the upstream side toward the downstream side, a maintenance pump capable of suctioning and discharging ink from the ink flow path, a one-way valve which is opened in accordance with decompression on the downstream side, thereby allowing passage of ink from the upstream side to the downstream side, and a control unit which controls the driving of the maintenance pump, thereby performing a cleaning process, wherein the control unit makes the maintenance pump suction ink from a pressure-changing position in the ink flow path by performing the suction driving of the maintenance pump after making the maintenance pump discharge ink from the pressure-changing position in the ink flow path into the ink flow path by performing the discharge driving of the maintenance pump. | 08-11-2011 |
20110193918 | FLUID EJECTING APPARATUS AND CLEANING METHOD - A printer includes: a fluid ejecting head provided with multiple nozzles that eject ink; an ink supply tube that supplies the ink to the fluid ejecting head; and a pressure application mechanism that pressurizes the ink to swell from the nozzles by pressurizing the ink within the ink supply tube and then depressurizes the interior of the ink supply tube while the ink is swelling from the nozzles. | 08-11-2011 |
20110193920 | LIQUID EJECTING APPARATUS, AND NOZZLE RECOVERY METHOD USED IN LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes a recording head that ejects an ink from a plurality of nozzles, a liquid supply passage and a reservoir that supply the ink from an upstream side toward a downstream side, a maintenance pump that is able to suck and discharge the ink from and to the liquid supply passage, a filter that clarify the ink in the reservoir, and a control unit that performs a recovery process of the nozzles by controlling an operation of the pump, wherein the control unit causes the maintenance pump to perform a sucking operation to suck the ink, and then causes the pump to perform a discharging operation to discharge the ink, thereby supplying the ink clarified by the filter to the nozzle side. | 08-11-2011 |
20140022315 | FLUID EJECTING APPARATUS AND CLEANING METHOD - A printer includes: a fluid ejecting head provided with multiple nozzles that eject ink; an ink supply tube that supplies the ink to the fluid ejecting head; and a pressure application mechanism that pressurizes the ink to swell from the nozzles by pressurizing the ink within the ink supply tube and then depressurizes the interior of the ink supply tube while the ink is swelling from the nozzles. | 01-23-2014 |
20140125743 | INK JET RECORDING INK AND INK JET RECORDING SYSTEM - An ink jet recording ink according to this invention is an ink jet recording ink to be contained in an ink containing vessel, in which the ink containing vessel has an ink containing chamber containing the ink and an air introduction flow path which introduces air into the ink containing chamber through the ink contained in the ink containing chamber, the ink contains a self-dispersion pigment, resin particles having a glass transition temperature of 10° C. or lower, and wax particles whose specific gravity is smaller than the specific gravity of a main solvent, and a ratio (R1/R2) of the volume average particle size (R1) of the resin particles and the volume average particle size (R2) of the wax particles is 1.0 or lower. | 05-08-2014 |
20140218451 | INK JET INK SET AND INK JET RECORDING SYSTEM - An ink jet ink set, at least has a cyan ink, a magenta ink, and a yellow ink, in which the cyan ink contains at least either one of C.I. Acid Blue 9 or C.I. Direct Blue 199, the magenta ink contains at least either one of C.I. Acid Red 249 or C.I. Reactive Red 141, the yellow ink contains at least either one of C.I. Direct Yellow 86 or C.I. Direct Yellow 132, and the cyan ink, the magenta ink, and the yellow ink all contain an alkylene oxide adduct of acetylene glycol having 12 or more carbon atoms in the main chain, acetylene glycol having 10 or more carbon atoms in the main chain, and polyoxy alkylene alkyl ether. | 08-07-2014 |