| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 219619000 | Roller (e.g., godet, etc.) | 9 |
| 20130098900 | IMAGE HEATING APPARATUS - An image heating apparatus includes a coil for generating a magnetic flux by a current flowing therethrough; an image heating member having an electroconductive layer in which an eddy current is produced by the magnetic flux by which heat is generated, the image heating member being effective to heat an image on a recording material; an electroconductive magnetic flux adjusting member movable from a first position and a second position to decrease the eddy current produced in the image heating member by the magnetic flux; a temperature sensor for sensing a temperature of image heating member; electric power control means for control electric power supplied to the coil on the basis of an output of the temperature sensor, wherein the electric power control means changes an electric power condition to be supplied to the coil before start of the movement from the first position to the second position of magnetic flux adjusting member. | 04-25-2013 |
| 20080237223 | INDUCTION HEATING DEVICE AND INDUCTION HEATING FIXING DEVICE - An induction heating coil of an induction heating device of the invention is formed such that a first coil width of an active coil section parallel to a longitudinal direction of a heat roller and a second coil width of an end coil section in a direction parallel to a rotating direction of the heat roller are different. When the induction heating coil is divided into plural coils, portions having weak magnetic fields in joint portions of the induction heating coils, at both ends of the induction heating coils, or the like are narrowed. | 10-02-2008 |
| 20080302785 | Coil unit and fixing apparatus - A fixing apparatus includes a mold (holding member) formed by injection molding to hold a coil so that the coil maintains a predetermined positional relation with respect to a heating roller, and capable of holding a temperature sensor which detects a temperature of the heating roller and a thermostat which detects an abnormal temperature of the heating roller in predetermined positions facing the heating roller. | 12-11-2008 |
| 20090101635 | COIL UNIT OF INDUCTION HEATING FIXING DEVICE - In an embodiment of the invention, a plug is connected to an end of a litz wire of an electromagnetic induction coil. In a state where the plug is protruded, the electromagnetic induction coil, an insulating plate, a magnetic core and a coil holder are integrally sealed with a coil mold. A center coil unit, a first and a second side coil units are arranged to be opposite to a heat roller, the plug is inserted in a socket of a power source code or a connection code, and the electromagnetic induction coil can be connected to a power source. | 04-23-2009 |
| 20100200570 | SYSTEM AND METHOD FOR REDUCING CROSSTALK BETWEEN WORKCOILS IN INDUCTION HEATING APPLICATIONS - A system includes a roll formed from a conductive material, where the roll is configured to rotate about an axis and has a direction of rotation. The system also includes multiple induction heating workcoils each configured to induce one or more magnetic fluxes within the roll to generate one or more electrical currents within the roll. Each induction heating workcoil can be oriented so that a mean magnetic flux induced by the workcoil is oblique to the roll's direction of rotation. Each of the induction heating workcoils could represent an unbalanced induction heating workcoil, or each of the induction heating workcoils could include a core having a shape that is not substantially dependent on the roll's diameter. | 08-12-2010 |
| 20090255922 | SYSTEM AND METHOD FOR REDUCING CURRENT EXITING A ROLL THROUGH ITS BEARINGS USING BALANCED MAGNETIC FLUX VECTORS IN INDUCTION HEATING APPLICATIONS - A system includes a roll formed from a conductive material, where the roll is configured to rotate about an axis. The system also includes at least one induction heating workcoil configured to generate multiple magnetic fluxes within the roll. Each induction heating workcoil includes at least two separately wound coils. The multiple magnetic fluxes when spatially summed have a substantially null magnetic flux vector. An induction heating workcoil could represent a balanced induction heating workcoil that is configured to individually generate multiple magnetic fluxes that when spatially summed have the substantially null magnetic flux vector. Multiple induction heating workcoils could also represent unbalanced induction heating workcoils configured to collectively generate multiple magnetic fluxes that when spatially summed have the substantially null magnetic flux vector. | 10-15-2009 |
| 20110073587 | INDUCTION HEATER - There are provided a heating roller that performs electromagnetic induction heating; a first exciting coil that heats the heating roller; a first degaussing coil that decreases magnetic fields of the first exciting coil; and a first axial direction core that guides magnetic fluxes, to thus make up a magnetic circuit between the first axial direction core and the heating roller. The first exciting coil has parallel portions extending in parallel with the axial direction of the heating roller and two turn portions provided at both ends of the parallel portions. The first degaussing coil has parallel portions extending in parallel with the axial direction of the heating roller and two turn portions provided at both ends of the parallel portions. One of the two turn portions and the parallel portions of the exciting coil are superimposed on one of the two turn portions and the parallel portions of the degaussing coil, and the first axial direction core is provided on a remaining side of the two turn portions of the first degaussing coil. Thus, the width of a heat zone is controlled in agreement with a sheet feeding area, and capability to control a temperature increase in a non-sheet-feeding area of the heating roller is enhanced. Thus, power can be saved during continual feeding of small recording sheets. | 03-31-2011 |
| 20080203088 | HEATING APPARATUS AND INDUCTION HEATING CONTROL METHOD - In an aspect of this invention, a fixing device includes a heating member including a first area and a second area formed of conductive members (e.g., aluminum and iron) having different magnetic permeability ratios, and an induction heating unit which generates a magnetic field from a coil to induction-heat this heating member, and the fixing device changes a frequency of a high-frequency current to be supplied to the coil to thereby control a heating area of the heating member. | 08-28-2008 |
| 20100288753 | INDUCTION HEATING DEVICE - There are provided a first excitation coil that is wound so as to have an axis in the same direction as that of a shaft of a heating roller and that is connected to a first power source, and a second excitation coil that is wound so as to have an axis in a direction substantially orthogonal to the shaft of the heating roller and that is connected to a second power source. The second excitation coil has parallel portions that extend in parallel to an axial direction of the first excitation coil and two folded sections provided at respective ends of the parallel portions. The two folded sections are provided along a circumference of the first excitation coil in such a way that circular arcs of the respective folded sections become opposite in direction to each other. Thus, the maximum available power is increased. When rapid warm-up is required, heating is caused by a coil connected to the auxiliary power source, to thus shorten a warm-up time. Occurrence of a temperature drop at the ends of the heating roller is prevented, to thus enhance energy efficiency. In ordinary situations other than the rapid warm-up operation, recharging can be performed by use of the coil. | 11-18-2010 |
