Abstract:
A fixing unit fixing an image on a paper and an image-forming apparatus having the same are provided. The fixing unit includes a heat roller, pressure rollers, a bracket, springs, and a paper guide. The heat roller has a heat source therein and the pressure rollers face the heat roller to form fixing nips. The bracket rotatably supports the pressure rollers and is also adapted to pivot. The springs elastically pressurize the bracket to closely attach the pressure rollers on the heat roller and the paper guide guides a paper so that a paper jam may not occur between the pressure rollers.
Abstract:
Provided is an image forming apparatus, which comprises a shielding member protruding from a top surface of the upper frame and forming a chamber portion having a predetermined area together with the upper cover of the main body covering the shielding member so as to include a plurality of heat dissipating holes perforated in the upper frame at predetermined intervals along a lengthwise direction, and a pump installed at one side of the chamber portion and blowing air into the chamber portion to form a laminar flow to prevent heat generated by a fusing roller from heating an upper cover of the image forming apparatus.
Abstract:
A bearing structure reduces friction between a roller and a bearing under a pressure. A fusing device for an image forming apparatus employs the bearing structure. The bearing structure installed between a frame and a rotary shaft supports the rotary shaft on the frame. A bearing body has a fitting part in which the rotary shaft is rotatably fitted. A rolling support unit is installed on at least one portion inside the fitting part to contact the rotary shaft in a rolling manner. The fusing device includes a fusing roller in which a heater is embedded, and a pressure roller that faces the fusing roller and cooperates with the fusing roller in pressing a sheet of paper passing therebetween. Bearing structures rotatably support the fusing roller and the pressure roller on a frame. Each bearing structure includes a bearing body having a fitting part, and a rolling support unit installed on at least one area inside the fitting part to contact the fitted roller in a rolling manner.
Abstract:
A fusing device to fuse an image to a printing medium, the fusing device including: a heating roller; a first pressing roller, which presses the printing medium against the heating roller; and a second pressing roller which attached to the first pressing roller, to detach the printing medium from the first pressing roller. The first and second pressing rollers are biased against the heating roller such that the first and second pressing rollers move according to a change in a position of the heating roller.
Abstract:
A fixing unit fixing an image on a paper and an image-forming apparatus having the same are provided. The fixing unit includes a heat roller, pressure rollers, a bracket, springs, and a paper guide. The heat roller has a heat source therein and the pressure rollers face the heat roller to form fixing nips. The bracket rotatably supports the pressure rollers and is also adapted to pivot. The springs elastically pressurize the bracket to closely attach the pressure rollers on the heat roller and the paper guide guides a paper so that a paper jam may not occur between the pressure rollers.
Abstract:
An image forming apparatus includes a shielding member protruding from a top surface of an upper frame and forming a chamber portion having a predetermined area together with an upper cover of the main body covering the shielding member so as to include a plurality of heat dissipating holes perforated in the upper frame at predetermined intervals along a lengthwise direction, and a pump installed at one side of the chamber portion and blowing air into the chamber portion to form a laminar flow to prevent heat generated by a fusing roller from heating an upper cover of the image forming apparatus.
Abstract:
A fusing unit of an image forming apparatus is capable of controlling fusing pressure according to detailed types of printing medium without deteriorating printing speed. A first roller rotates about a first rotation shaft CR1. A second roller rotates in contact with the first roller about a second rotation shaft CR2 and is movable along the outer circumference of the first roller. A moving unit relocates the second roller according to a type of printing medium. A pressing unit presses the second roller toward the first roller by applying different pressures according to a position of the second roller with respect to the first roller.