| 摘要 |
<p>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 (30) in which a heater is mounted, a circulating belt (200) tightly engaged with the heat roller and forming a nip through which a printable medium (1) passes, a plurality of guide rollers (110,120) supporting the circulating belt for rotation of the circulating belt, and bushings (100) formed on both ends of each guide roller and having a regulating portion (100a) for preventing the circulating belt from meandering. Protrusions (101) are formed on a surface of the bushings (100) contacting the circulating belt to reduce a contact area between the circulating belt and the bushings. Therefore, the contact area between the travelling 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.</p> |
