| Patent application number | Description | Published |
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| 20080286015 | DEVELOPMENT DEVICE AND IMAGE FORMING APPARATUS - The development device includes a toner carrier, a toner supplier, and a surface electrical potential controller. When the toner supplier supplies toner particles to the toner carrier, the toner carrier carries toner particles to adhere to a latent image formed on the latent image carrier and has a time constant τ | 11-20-2008 |
| 20090016781 | DEVELOPING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - A developing device comprises a latent image carrier that carries a latent image, a toner carrier opposing the latent image carrier while carrying toner to develop the latent image, and plural electrodes arranged in a prescribed direction insulated from each other on the surface of the toner carrier to create an electric field therebetween. An alternating voltage supplying device is provided to supply n number of phases (n≧2) of an alternating voltage to the plural electrodes, respectively. The alternating voltage changes the electric field to cause the toner to hop and form toner cloud on the surface of the toner carrier. The toner hopping is halted at a prescribed time period during the toner cloud formation. | 01-15-2009 |
| 20090290901 | DEVELOPMENT DEVICE - A development device includes an open-ended housing, a rotatable roller, an array of multiple primary electrodes, a voltage source, a sealing member, and a secondary electrode. The housing accommodates toner for application to the photoconductive surface through an end opening thereof. The roller has an outer circumferential surface to deliver the toner from within the housing to a development zone. The array of multiple primary electrodes are aligned with each other on the roller surface. The voltage source applies a periodic pulse voltage to at least a subset of the primary electrodes to generate an oscillating primary electric field. The sealing member seals clearance between the roller surface and an edge of the end opening downstream from the development zone. The secondary electrode generates a secondary electric field to force the toner from the sealing member toward the roller surface to prevent premature removal of the toner. | 11-26-2009 |
| 20100278558 | ELECTROPHOTOGRAPHIC IMAGE FORMING METHOD AND APPARATUS - The image forming apparatus includes a latent image bearing member; a charging device charging the surface of the latent image bearing member; a latent image forming device forming an electrostatic latent image on the surface of the latent image bearing member; a developing device supplying toner to the electrostatic latent image to form a toner image; a cover film supplying device supplying a cover film to the surface of the latent image bearing member at a cover film supplying position located on an upstream side from the development position so that the toner image is formed on the cover film covering the surface of the latent image bearing member; and a cover film separating device separating the cover film bearing the toner image thereon from the surface of the image bearing member before the cover film bearing the toner image thereon reaches the cover film supplying position. | 11-04-2010 |
| 20110064475 | RECYCLING IMAGE FORMING APPARATUS - An image forming apparatus includes a first image formation unit that forms a black toner image, and a detachable second image formation unit that forms a color toner image. A first toner supply unit is provided to supply the black toner to the first image formation unit. A second toner supply unit is provided to supply one of a black and component color toner to the first and second image formation units in accordance with a color mode. A first conveyance path is provided to convey the black toner to the first image formation unit. A second conveyance path is also provided to convey the component color toner stored in the second toner container section to the second image formation unit. The second toner supply unit is selectively connected to one of the first and second conveyance paths in accordance with the color mode. | 03-17-2011 |
| 20110064488 | IMAGE FORMING APPARATUS - An image forming apparatus including a conveyance unit to convey a transfer medium, a first image forming unit to form a monochrome image transferred at a first transfer position onto the transfer medium, and a second image forming unit disposed downstream from the first image forming unit in a direction of conveyance of the transfer medium, including an intermediate transfer body to form a multi-colored toner image on the intermediate transfer body. The multi-colored toner image is transferred onto the transfer medium at a second transfer position. The conveyance unit is separated from the intermediate transfer body at the second transfer position in a monochrome mode to form the monochrome image using only the first image forming unit, and contacts the intermediate transfer body at the second transfer position in a full-color mode to form a full-color image using both the first and second image forming units. | 03-17-2011 |
| Patent application number | Description | Published |
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| 20080223290 | LIQUID APPLYING APPARATUS AND INK JET PRINTING APPARATUS - It is an object of the present invention to provide a liquid applying apparatus which can prevent an applying liquid from evaporating while an applying operation is at a stop and which can reliably prevent the liquid from leaking even when for example, the posture of the apparatus is tilted. Thus, according to the present invention, an abutting member of a holding member is abutted, under an urging force of a spring, against an applying surface of an applying roller. Thus, a liquid holding space is formed between the applying roller and a holding member to hold the applying liquid. The abutting member is annularly formed of a single member. The applying roller rotates to cause the applying liquid held in the holding space to adhere to an outer peripheral surface of the applying roller. The applying liquid is then applied to the applying medium. | 09-18-2008 |
| 20080273055 | PRINTING APPARATUS - For a serial color ink jet printing apparatus that forms an image using a symmetric printing head that ejects large dots and small dots, the configuration of a printing head is provided for suppressing, to the extent possible, a cyclic fluctuation in the main scanning direction. According to the present invention, individual nozzle arrays are arranged so that two nozzle arrays, i.e., a cyan nozzle array c | 11-06-2008 |
| 20080278555 | INK JET PRINTING APPARATUS - For a liquid applying mechanism of an ink jet printing apparatus, a liquid to be used for applying it to a medium is prevented from evaporating and leaking from a liquid holding member. An applying roller and the liquid holding member contact with each other to hold the liquid and apply the held liquid to a printing medium by means of the applying roller. In this configuration, the surface of the applying roller has no irregularities. Thereby, the applying roller can contact with the liquid holding member to form an adequate liquid-tight seal therebetween. | 11-13-2008 |
| 20080297573 | LIQUID APPLYING APPARATUS AND INK JET PRINTING APPARATUS - The present invention provides a liquid applying apparatus that prevents an applying roller from being degraded while contacting with an application liquid for a long time. Specifically, once an applying operation has been completely executed on an applying medium, the apparatus stands by for 60 seconds while holding the application liquid in a liquid holding member. When an applying instruction is not given during this period, the apparatus performs an application liquid collecting operation of discharging the application liquid from the liquid holding member. Thus, upon determining that no applying operation has been performed for a certain period after one applying operation has been finished, the apparatus collects the application liquid from the liquid holding member. This avoids immersing the applying roller in the application liquid for a long time. Therefore, the applying roller is prevented from being degraded by the application liquid. | 12-04-2008 |
| 20100013876 | LIQUID APPLICATION DEVICE AND INK JET RECORDING APPARATUS - The present invention provides an inkjet recording apparatus and a recording apparatus capable of reducing wear of a roller for application, even if liquid (for example, application liquid) is insufficient in a case where liquid is applied to recording media. In an embodiment of the present invention, in a case where it is determined that the application liquid is sufficient in a storage tank, the application liquid is filled in a liquid retention space, the application liquid is applied to the recording medium, and thus recording is performed. In a case where it is determined that the liquid application is insufficient in the storage tank, recording with application is prohibited. | 01-21-2010 |
| 20100289841 | PRINTING APPARATUS AND CONTROL METHOD OF PRINTING APPARATUS - An apparatus includes a sheet feeding unit configured to feed sheets one by one from a storing unit, a coating unit configured to apply a coating liquid on a fed sheet, and a printing unit configured to perform printing on the coated sheet. The control unit controls timing to start a sheet feeding of a next page while a current page is being printed, depending on occurrence of event of temporary interruption or delay of printing operation. | 11-18-2010 |
| 20100328393 | LIQUID APPLICATION DEVICE, INKJET RECORDING APPARATUS, AND METHOD OF CONTROLLING LIQUID APPLICATION DEVICE - The present invention provides a liquid application device, an inkjet recording apparatus and a recording apparatus, which are capable of performing an adequate application initial operation according to the length of waiting time and power-off time, as well as a method of controlling the liquid application device. In the present invention, information on an end time of the previous processing for collecting liquid is read from a nonvolatile memory, current time information indicating the current time is obtained, and information on a lapse of time from the end time of the previous collection to a start time of the current application. Thereafter, the number of preliminary rotations R of an application roller is decided based on the information on the lapse of time with reference to a look-up table. Sequentially, the application roller is rotated by the decided number of preliminary rotations R to perform preprocessing operation. | 12-30-2010 |
| 20110216142 | LIQUID APPLICATION DEVICE AND INK JET RECORDING APPARATUS - The present invention provides a liquid application device and an ink jet recording apparatus each capable of reducing deterioration in application quality due to an increase in the number of times of use of a roller, thereby improving durability. The present invention includes an application roller which applies liquid to an application medium, and a liquid retention member which retains the liquid in a liquid retention space formed by making the application roller be in contact with the retention member. With this structure, a pool of the liquid is formed, with rotation of the application roller, in an area upstream of a contact area, in a rotational direction, between the application member and the retention member at a side where a surface of the application member enters the contact area therebetween. | 09-08-2011 |
| 20110310141 | PRINTING APPARATUS AND INK SUPPLY METHOD THEREOF - A printing apparatus, including a print head having a discharge port, a stirring portion configured to stir ink in an ink tank, a valve disposed on a supply path, a cap for capping the discharge port, and a pressure reducing unit configured to reduce pressure in the cap, executes, in parallel, a stirring operation for stirring ink in the ink tank by the stirring portion and a pressure reducing operation for reducing pressure on the print head side from the valve in the supply path by the pressure reducing unit with the valve closed. | 12-22-2011 |
| 20120062651 | PRINTING APPARATUS - For a serial color ink jet printing apparatus that forms an image using a symmetric printing head that ejects large dots and small dots, the configuration of a printing head is provided for suppressing, to the extent possible, a cyclic fluctuation in the main scanning direction. According to the present invention, individual nozzle arrays are arranged so that two nozzle arrays, i.e., a cyan nozzle array c | 03-15-2012 |
| 20130293631 | PRINTING APPARATUS AND CONTROL METHOD THEREFOR - The invention has been made to prevent ink adhesion or an ink discharge failure caused by ink adhesion due to evaporation of volatile components of ink which occurs when the ink receptor of a printhead is exposed to air for a long time. If an inkjet printhead and an ink tank containing ink to be supplied to the printhead are attached to a carriage, the ink supply port of the ink tank is pressed to the ink receptor of the printhead. In this arrangement, the presence/absence of attachment of the ink tank to the carriage is detected. If it is detected that the ink tank is not attached to the carriage, a suction operation for the printhead is performed and controlled to suck out ink from the nozzles of the printhead. | 11-07-2013 |
| 20130300798 | PRINTING APPARATUS AND CONTROL METHOD THEREFOR - An embodiment of the invention has been made to prevent an ink discharge failure or ink mixing caused by preliminary discharge executed with the ink discharge surface of a printhead capped. In the embodiment, to an inkjet printhead in which nozzle arrays are aligned in a direction different from that in which a plurality of nozzles are aligned the following preliminary discharge processing is executed. A cap including a suction port and an air communication port caps the ink discharge surface. After that, a suction recovery unit is driven, thereby performing preliminary discharge for nozzles, among the nozzles of the nozzle arrays, with a long distance to a straight line connecting the suction port with the air communication port before preliminary discharge for nozzles with a short distance to the straight line. | 11-14-2013 |
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| 20080196413 | Cogeneration system - In a cogeneration system having a first power plant connected to an AC power feed line between a power network and an electrical load and a first internal combustion engine for driving the first power plant such that exhaust heat of the first engine is supplied to a thermal load, power supply from the first power plant to the power network is interrupted by turning off a switch installed in the feed line, when outage of the power network is detected and a second power plant is operated, such that outputs of the first and second power plants are supplied to the electrical load. With this, it becomes possible to respond to a commercial power network outage for preventing reverse flow of the power output by the cogeneration system into the power network and supplying as much electric power as possible to the electrical load. | 08-21-2008 |
| 20080197630 | Cogeneration system - In a cogeneration system having a power plant comprising a generator connected to an AC power feed line between a power network and an electrical load and an internal combustion engine for driving the generator and for supplying its exhaust heat to a thermal load, the power supply from the generator to the power network is interrupted by turning off a switch installed in the feed line when an outage of the power network is detected, and a battery for storing DC power is connected to an inverter circuit to invert the DC power to AC power, such that the inverted AC power of the battery and the output of the generator are supplied to the electrical load, thereby enabling to respond to a power network outage for preventing reverse flow of the power output by the cogeneration system into the power network and supplying as much electric power as possible to the electrical load. | 08-21-2008 |
| 20080197709 | Cogeneration system - In a cogeneration system having a generator that generates DC power, an internal combustion engine for driving the generator, a battery that stores DC power for starting the engine, and an inverter that inverts the DC power generated by the generator to AC power, there are provided a solar unit that generates DC power by converting radiant energy of sunlight into electrical energy and a DC/DC converter that boosts the DC power stored in the battery, such that one of the generator and the solar unit is connected to the inverter through the DC/DC converter, thereby enabling to share the DC/DC converter and thus to make structure simple. | 08-21-2008 |
