Abstract:
A fixing device and an image forming apparatus including the fixing device includes a core pipe which is made to be thin to a predetermined thickness or less and having a strength that increases while being aging-treated based on the use time of the fixing device, and a fixing belt to enlarge a fixing Thus, a warming-up time is shortened, a print speed increases, and a fixing quality is improved.
Abstract:
A fusing apparatus and an image forming apparatus using the fusing apparatus are provided. The fusing apparatus includes a fusing roller having a heat generating unit and a pressing unit having a fusing belt supported by at least two pressing members that circulates and contacts the fusing roller by the pressing members.
Abstract:
A fusing device to reduce lubricant leakage, includes a fusing belt having a heat source placed therein, a pressure roller placed to apply pressure to an outer surface of the fusing belt, and a nip plate to support an inner surface of the fusing belt so as to define a fusing nip between the fusing belt and the pressure roller. The nip plate includes a stepped portion spaced apart from the inner surface of the fusing belt so as to define a space for accommodation of a lubricant applied to the inner surface of the fusing belt. The fusing device may further include a side frame to rotatably support a longitudinal end of the fusing belt. The side frame may be provided with a lubricant guide to guide the lubricant on the longitudinal end of the fusing belt toward the center of the fusing belt.
Abstract:
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.
Abstract:
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.
Abstract:
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.
Abstract:
An image fixing unit for use in an image forming apparatus for fixing a toner image on a printable medium is provided. The image fixing unit includes a heat roller in which a heater is mounted, a circulating belt tightly engaged with the heat roller and forming a nip through which a printable medium passes, a plurality of guide rollers supporting the circulating belt for rotation of the circulating belt, and bushings formed on both ends of each guide roller and having a regulating portion for preventing the circulating belt from meandering. Protrusions are formed on a surface of the bushings contacting the circulating belt to reduce a contact area between the circulating belt and the bushings. Therefore, the contact area between the traveling circulating belt and the bushings, which are fixed components of the guide rollers, is reduced and wear and tear of the circulating belt and a drive torque for driving the image fixing unit are also thus reduced.
Abstract:
A fusing roller for an image forming apparatus is provided. The fusing roller includes a tubular fusing unit having a treated surface, an inner pipe inserted into the fusing unit, a heating unit surrounding an outer circumferential surface of the inner pipe and generating heat, and an insulating unit. The insulating unit includes a first insulating unit, which includes one or more insulating layers and is disposed between the heating unit and the inner pipe, and a second insulating unit, which includes one or more insulating layers and is disposed between the heating unit and the fusing unit.
Abstract:
A fixing device of an image forming apparatus includes a heating roller, a pressing roller forming a first fixing nip by contacting the heating roller, and a pressing member disposed at a lower stream of the heating roller and forming a second fixing nip by contacting the heating roller. A fixing belt runs along a caterpillar track, and winds around the pressing roller and the pressing member. The pressing member includes a protrusion part for pressing the paper passed through the second fixing nip by greater pressure at a nip outlet than at the second fixing nip. Accordingly, as the width of the fixing nip is increased, the staying time at the fixing nip increases, thereby improving printing quality according to performance of high-speed printing. Additionally, wrap jams of the paper may be substantially prevented from occurring at the nip outlet.