| Patent application number | Description | Published |
|---|
| 20080199231 | FUSING UNIT AND IMAGE FORMING APPARATUS USING THE SAME - A fusing unit is formed along a printing path in an image forming apparatus and fuses an image transferred to a printing medium. The fusing unit includes: a heat source; a nip plate which is heated by the heat source, and comprises a nip part to heat and press the printing medium; and a reflection member to reflect heat generated by the heat source toward the nip part. A belt member is rotatably provided about the heat source, the nip plate and the reflection member, and guides the movement of the printing medium. A driving roller faces the nip part and rotatably drives the belt member. The nip plate and the driving roller form a fusing nip, which quickly heats and provides for quick fusing of a toner image to a printing medium. | 08-21-2008 |
| 20080219727 | IMAGE FORMING APPARATUS - An image forming apparatus to shorten a warm-up time required to fuse a visible image to a printing medium is provided. The image forming apparatus includes an indirect heating member to indirectly transfer radiant heat to the visible image formed on the printing medium passing through the fusing nip, and a direct heating member to directly transfer resistance heat to the visible image formed on the printing medium passing through the fusing nip. Accordingly, since the radiant heat generated from the indirect heating member heats the direct heating member, a heating rate of the direct heating member increases, and the warm-up time required to reach a predetermined fusing temperature to fuse the visible image is shortened. | 09-11-2008 |
| 20080232871 | FIXING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A fixing device includes a pressing roller, a fixing belt to receive a rotation force transferred from the pressing roller and to rotate thereby, a nip forming member which is mounted inside the fixing belt, the nip forming member including a heat transmission unit formed thereon, and a heat source, which is mounted inside the nip forming member, to simultaneously apply heat to the nip forming member and to the fixing belt through the heat transmission unit. | 09-25-2008 |
| 20080240806 | FIXING UNIT AND IMAGE FORMING APPARATUS HAVING THE SAME - A fixing unit which enables high-speed operation and miniaturization, and an image forming apparatus having the fixing unit, includes a heating member which is heated by a heat source, the heating member having a predetermined width; a rotating member to rotate in contact with the heating member; a driving member to rotate the rotating member; and a pressing member to press both sides of the heating member towards the driving member and to form a predetermined fixing nip between the rotating member and the driving member, wherein the heating member has a second moment of inertia which is set to maintain a fixing efficiency of 90% or more in a central portion of the heating member. | 10-02-2008 |
| 20080247789 | FIXING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A fixing device includes a fixing roller, a fixing belt which is made to rotate by a rotation force received from the fixing roller, a nip forming unit to form a nip zone at a contact area between the fixing roller and the fixing belt, and a first heating unit, which is separated from the nip zone, to apply heat to the fixing belt. The nip zone and the heating unit are separated, so that the heating unit can be prevented from being broken as a result of the pressurization and thermal deformation. | 10-09-2008 |
| 20080317527 | FUSING APPARATUS AND ELECTROPHOTOGRAPHIC IMAGE-FORMING APPARATUS HAVING THE SAME - A fusing apparatus includes a heating unit to generate heat to fuse an image onto a printing medium, a pressurizing roller that faces and contacts the heating unit having an endless fusing film that is rotated while facing and contacting the pressurizing roller and presses the printing medium toward the heating unit, a nip forming member including a main body formed inside the fusing film to surround a heat source and contacts a portion of the fusing film to the pressurizing roller to form a nip, a plurality of opening forming portions connected to the main body and form an opening portion such that heat generated from the heat source directly arrives at the fusing film via the opening portion, and a plurality of adhering portions connected to the opening forming portions, are separated from each other, having the opening portion therebetween, and contact the fusing film, and a supporting member to support the nip forming member. | 12-25-2008 |
| 20090110451 | FUSING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A fusing device includes a pressure unit, a belt unit to rotate in outer contact with the pressure unit, a nip forming unit to form a nip over a contact portion between the pressure unit and the belt unit, a heating unit to heat the nip forming unit and the belt unit, and a support unit to press and support the nip forming unit constantly and having a plurality of heat transmission portions defined in a parallelogrammic shape of an oblique direction with respect to a traveling direction of the belt unit. | 04-30-2009 |
| 20090175645 | IMAGE FORMING APPARATUS, FUSING DEVICE THEREOF AND METHOD OF CONTROLLING FUSING DEVICE - An image forming apparatus that is capable of preventing a damage to a fusing belt or hazardous conditions due to the overheating of the fusing belt and a fusing device thereof are disclosed. The image forming apparatus has a fusing device including a fusing belt, a heat source disposed in the fusing belt, a support member to support the fusing belt, the support member having an opening through which heat emitted from the heat source passes to at least a portion of the fusing belt, and a first temperature sensor positioned to measure temperature of the fusing belt at the portion directly heated by radiant heat transmitted through the opening. A control unit of the image forming apparatus controls the heat source based on the temperature measured by the first temperature sensor. | 07-09-2009 |
| 20100119247 | FUSING UNIT, CONTROL METHOD THEREOF AND IMAGE FORMING APPARATUS EMPLOYING THE SAME - Disclosed are a fusing unit capable of a variable fusing pressing force, a control method thereof and an image forming apparatus employing the same. The fusing pressing force may be selectively varied so as to apply a lesser force at the initial stage of the operation of the fusing unit, and may be increased to a desired level of force suitable for fusing operation so as to minimize excessive torque in a driving motor that rotationally drives the fusing device. | 05-13-2010 |
| 20110091229 | FUSING UNIT, CONTROL METHOD THEREOF, AND IMAGE FORMING APPARATUS HAVING THE SAME - A fusing unit includes a driving source, a fusing part which includes a heat source and is driven by the driving source to heat and press a transported printing medium to fuse an image transferred to the printing medium, an electric power supplying unit which supplies an electric power to the heat source, and a control unit which senses the torque of the driving source or a property value corresponding to the torque, and restricts or blocks electric power supplied to the heat source from the electric power supplying unit during a predetermined time if a change rate of the torque or the property value deviates from a reference value. | 04-21-2011 |
