Patent application number | Description | Published |
20080219722 | FIXING DEVICE AND FIXING METHOD OF IMAGE FORMING APPARATUS - In a fixing device of an image forming apparatus of the present invention, inner surfaces of upper and lower frames for respectively supporting a heat roller and a pressure roller are formed as a mirror surface. Between the heat roller and an infrared temperature sensor, an infrared transmission filter for cutting infrared rays beyond a wave length zone equivalent to a heatable area of the heat roller is installed. Detection results of a surface temperature of the heat roller by the infrared temperature sensor are prevented from exceeding the error tolerance due to infrared rays radiated from other than the heat roller. Temperature control for the heat roller is improved and a fixed image of high image quality is obtained. | 09-11-2008 |
20080285996 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND HEATING CONTROL METHOD FOR FIXING DEVICE - A fixing device includes a heat roller having a degaussing alloy material, an induction heating member for exciting the heat roller, an inverter circuit for giving power at a predetermined frequency to the induction heating member, and a control unit, and when driving at a first drive frequency and fixing small size sheets by continuous passing, a local temperature rise occurs at an end part of the heat roller, and the end part approaches the Curie temperature, and when impedance of the inverter circuit reduces and an excessive current flows in the circuit, the fixing device drives at a higher second drive frequency, thereby increases a resistance of the heat roller by an epidermal effect of magnetic flux, increases an apparent resistance of the inverter circuit, makes it possible to use a flowing current within a normal range, heating a central part of the heat roller, and continues the fixing. | 11-20-2008 |
20090175646 | FIXING DEVICE OF IMAGE FORMING APPARATUS - A fixing apparatus of an image forming apparatus of the present invention, in arrival timing of a temperature falling area of a heat roller passing a nip at opposite position γ of an induction heating coil from temperature detection position β by an infrared temperature sensor around the heat roller, according to detection results by the infrared temperature sensor, controls an output value of the induction heating coil under control of an inverter circuit, heats and returns the heat roller in real time to a fixable temperature, and realizes energy conversation. At the time of arrival at the nip, the heat controller is always set to a fixed fixable temperature, thus in a fixed image, a high image quality free of ripple marks can be obtained. | 07-09-2009 |
20100014880 | FIXING DEVICE, TEMPERATURE CONTROL METHOD OF FIXING DEVICE, AND IMAGE FORMING APPARATUS - A fixing device includes a heated body having a metal conductive layer, a pressing body to permit a sheet to pass through between the heated body and itself, a sheet detection portion to detect the sheet conveyed between the heated body and the pressing body, an induction heating coil to generate an induced current in the metal conductive layer, and a controller, on the basis of the detection results of the sheet detection portion, to detect a first boundary where a part of the sheet in contact with the heated body is switched to a part not in contact with the heated body and a second boundary where the part of the sheet not in contact with the heated body is switched to the part in contact with the heated body and when the first boundary and second boundary face the induction heating coil, changing the power value to be supplied to the induction heating coil. | 01-21-2010 |
20100014882 | FIXING DEVICE OF IMAGE FORMING APPARATUS - The fixing device of the image forming apparatus of the present invention is provided with a heat transfer probe which contacts the heat roller and a surface temperature of the heat roller is transferred thereto. The erroneous detection of the surface temperature of the heat roller caused from materials adhered to the heat roller is prevented, induction heating coils is regulated at a high level of accuracy using the highly precious detection result obtained from the heat transfer probe, the temperature control of the heat roller is promoted and a fixed image of high quality is obtained. | 01-21-2010 |
20100014899 | FIXING DEVICE - A technique of reducing temperature unevenness in a heating member which heats a heating target member while reducing heat capacity of the heating member in a fixing device for an image forming apparatus is provided. The fixing device has a heating member having diamond fine particles dispersed and contained at least in its surface layer, a pressurizing member which is pressed in contact with the heating member and nips and carries a sheet in collaboration with the heating member, and a heating unit which heats the heating member. | 01-21-2010 |
20100104333 | HEATING ROLLER AND IMAGE FORMING APPARATUS - The present invention provides a technique that can contribute to the improvement of fixing performance while maintaining appropriate nip width. A heating roller includes: a core configured to rotate around a predetermined rotation axis; plural elastic layers laminated on the outer circumference of the core; and a conductive layer formed on the outer circumference of the plural elastic layers. The plural elastic layers have, in a rotation radius direction, larger specific heat in the elastic layer on the outer side than in the elastic layer on the inner side and have lower thermal conductivity in the elastic layer on the inner side than in the elastic layer on the outer side. | 04-29-2010 |
20100124447 | IMAGE FORMING APPARATUS AND FUSER APPARATUS - According to an embodiment of the invention, a heat uniforming member, which has an outer diameter smaller than an inner diameter of a hollow member and in which thermal deformation generated by thermal expansion remains, is set in the inside of the hollow member having a center axis, support members are set to both ends of the hollow member to enable supporting of ends of the heat uniforming member, and an endless body having a uniform thermal distribution is formed by heating the hollow member, the heat uniforming member and the support member at a specified temperature for a specific time and causing the heat uniforming member to adhere closely to an inner wall of the hollow member. | 05-20-2010 |
20110070006 | TEMPERATURE EQUALIZING ROLLER AND FIXING DEVICE - A temperature equalizing roller includes a metal pipe, a heat pipe that is located inside the metal pipe and has a thermal expansion coefficient higher than that of the metal pipe, and a joining layer. The joining layer lies between an outer peripheral surface of the heat pipe and an inner peripheral surface of the metal pipe, joins the outer peripheral surface of the heat pipe and the inner peripheral surface of the metal pipe, and has a higher thermal conductivity than a thermal conductivity of air. | 03-24-2011 |
20110076043 | FIXING DEVICE - A fixing device includes a belt that has an endless shape, a roller that forms a nip with the belt, a support member that supports the belt interposed between the support member and the roller, a coil that generates a magnetic field for inducing current in the belt, an auxiliary heat generation member that generates heat with the current induced by the magnetic field in the loop of the belt, and a temperature sensor that is opposed to the auxiliary heat generation member with the belt interposed between the element and the auxiliary heat generation member and detects the temperature of an outer peripheral surface of the belt. | 03-31-2011 |
20110081156 | IMAGE FORMING APPARATUS AND FUSER UNIT - According to one embodiment, a fuser including, a first endless member into which fluid, which retains heat, can flow, a second endless member configured to apply pressure to the first endless member, a fluid moving mechanism configured to move the fluid to the first endless member and move the fluid from the first endless member, and a heat source configured to raise temperature of the first endless member to a predetermined temperature. | 04-07-2011 |
20110081175 | IMAGE FORMING APPARATUS AND FUSER UNIT - According to one embodiment, a fuser including, a first endless member including a gel-like silicone material and configured to apply heat to an object, a second endless member configured to apply pressure to the first endless member, and a heat source configured to raise temperature of the first endless member to predetermined temperature. | 04-07-2011 |
20110262194 | IMAGE FORMING APPARATUS AND FUSER APPARATUS - According to an embodiment of the invention, a heat uniforming member, which has an outer diameter smaller than an inner diameter of a hollow member and in which thermal deformation generated by thermal expansion remains, is set in the inside of the hollow member having a center axis, support members are set to both ends of the hollow member to enable supporting of ends of the heat uniforming member, and an endless body having a uniform thermal distribution is formed by heating the hollow member, the heat uniforming member and the support member at a specified temperature for a specific time and causing the heat uniforming member to adhere closely to an inner wall of the hollow member. | 10-27-2011 |
20110286028 | IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING IMAGE FORMING APPARATUS - According to one embodiment, an image forming apparatus includes a printer, a wireless device, an authentication information reader, an authentication device, and a processor. The printer forms an image on an image forming medium. The wireless device receives signals sent from an external device. The authentication information reader reads authentication information from a user operating the image forming apparatus. The authentication device authenticates the user by the authentication information read by the authentication information reader. If the wireless device receives signals sent from the external device, the processor starts warming up of the image forming unit, also, if the authentication device succeeds in user authentication, the processor causes the printer to form an image on the image forming medium in response to the user's request. | 11-24-2011 |
20120082484 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - According to one embodiment, there are provided a developing section storing a color erasable developing agent that includes capsule colorant particles with a core in which a color developable compound, a color developing agent, and a color erasing agent are contained, and a developing section storing a binder resin-containing transparent developing agent. A transparent developing agent image is transferred to a region capable of covering a color erasable developing agent image and the resulting image is fixed. | 04-05-2012 |
20120183337 | FUSER AND IMAGE FORMING APPARATUS - According to one embodiment, a fuser includes a heating roller, an endless belt, and a pressing roller. The heating roller rotates and comes into contact with a toner surface side of a sheet to heat the sheet. The endless belt has hardness lower than the hardness of the heating roller. The pressing roller is an only rotating body provided in a space formed by the endless belt and having an outer diameter smaller than the inner diameter of the endless belt. The pressing roller has hardness lower than the hardness of the heating roller and presses the heating roller via a part of the endless belt. | 07-19-2012 |
20130004219 | FUSER USING ENDLESS BELT AND IMAGE FORMING APPARATUS - According to one embodiment, a fuser includes a heat roller, an endless belt, a first press roller and a second press roller. The heat roller rotates and contacts a toner surface side of a sheet, and heats the sheet. The endless belt contacts a part of an outer peripheral surface of the heat roller. The first press roller contacts a part of an inner peripheral surface of the endless belt, and is provided at an insertion part of the sheet in a nip portion where the heat roller contacts the endless belt. The second press roller contacts a part of the inner peripheral surface of the endless belt, is provided at an exit part of the sheet in the nip portion, and has a lower rotational resistance than the first press roller. | 01-03-2013 |
20130164008 | IMAGE FORMING METHOD - According to one embodiment, a developing device in which a decolorizable developing agent containing encapsulated colorant microparticles each including a core containing a color developable compound, a color developer, and a decolorizing agent is accommodated and a developing device in which a transparent developing agent containing a binder resin is accommodated are provided, respectively, and an image is formed by transferring a transparent developing agent image onto a region capable of covering a decolorizable developing agent image, followed by fusing the image. Further, in the second image formation and thereafter, the using amount of the transparent developing agent is decreased as compared with that in the first image formation. | 06-27-2013 |