Patent application number | Description | Published |
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 |
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 |
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 |
20100258557 | IMAGE FORMING APPARATUS - A heating fuser includes: a rotating member configured to heat a toner transferred onto a sheet; a first coil body configured to generate a first magnetic field for inducing eddy-current in a first area including the center in a rotation axis direction of the rotating member; second coil bodies configured to generate second magnetic fields for inducing eddy-current in second areas of the rotating member adjacent to the first area in the rotation axis direction; third coil bodies located to extend over the first and second coil bodies when viewed in a direction orthogonal to the rotation axis direction; and a driving circuit configured to drive the third coil bodies between a first state in which the third coil bodies generate magnetic fields for weakening the first magnetic field and a second state in which the third coil bodies generate magnetic fields for strengthening the second magnetic fields. | 10-14-2010 |
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 |
20110222933 | FIXING APPARATUS - A fixing apparatus according to an embodiment includes: a first roller; a second roller that forms a nip between the second roller and the first roller and pressurizes a sheet passing through the nip against the first roller; a third roller that is disposed in parallel with the first and second rollers; a fixing belt that is stretched over the first and third rollers; a heater that uniformly heats the fixing belt in a direction of a width of the fixing belt; and a heat-uniformizing member that is a shaft-shaped heat-uniformizing member embedded in the third roller. An effective length in a longitudinal axial direction of the heat-uniformizing member is set to be the same or greater than a width of a predetermined maximum sheet so as to uniformly distribute heat of the fixing belt which is in contact with the third roller in the longitudinal axial direction. | 09-15-2011 |
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 |
20140126939 | FIXING APPARATUS FOR FIXING TONER ONTO A SHEET - A fixing apparatus according to an embodiment includes: a first roller; a second roller that forms a nip between the second roller and the first roller and presses a sheet passing through the nip against the first roller; a heater that heats at least one of the first roller and the second roller, a heating range of the heater being greater than a maximum printing width of a predetermined maximum sheet width, and a heat-uniformizing member that distributes heat of the heater along a longitudinal direction thereof, an effective length of the heat-uniformizing member in the longitudinal direction being the same as, or greater than, the predetermined maximum sheet width. | 05-08-2014 |
20140314456 | FIXING DEVICE AND IMAGE FORMING APPARATUS - According to one embodiment, a fixing device includes an endless heat generating section including a conductive layer, an induction-current generating section configured to generate an induction current in the conductive layer, a temperature-sensitive magnetic body present in a position opposed to the induction-current generating section via the heat generating section, and a magnetic plate present in a position opposed to the heat generating section via the temperature-sensitive magnetic body. | 10-23-2014 |
20140314457 | FIXING DEVICE AND IMAGE FORMING APPARATUS - According to one embodiment, a fixing device includes an endless heat generating section including a conductive layer, a magnetic-flux generating section configured to generate a magnetic flux and generate an induction current in the conduction layer, a first magnetic-flux regulating section having a first magnetic flux concentration force and configured to regulate the magnetic flux of the magnetic flux generating section, a second magnetic-flux regulating section arranged adjacent to the first magnetic-flux regulating section, having a second magnetic flux concentration force larger than the first magnetic flux concentration force, and configured to regulate the magnetic flux of the magnetic-flux generating section, and an auxiliary heat generating section including a magnetic body arranged in a position opposed to the magnetic-flux generating section via the heat generating section, the position being a region extending across the first magnetic-flux regulating section and the second magnetic-flux regulating section. | 10-23-2014 |