Patent ID: 7761045

Claim:
A belt feeding apparatus comprising: an endless belt with a mark formed at a substantially central position in a widthwise direction thereof; a driving roller configured to rotatably drive said endless belt; a supporting roller configured to rotatably support said endless belt; a displacing device configured to displace one longitudinal end of said supporting roller; a first detector, disposed at a position away from a normal zone of said endless belt in the widthwise direction, configured to detect one end of said endless belt in the widthwise direction; a second detector, disposed at a substantially central position of the normal zone of said endless belt in the widthwise direction, configured to detect the mark of said endless belt; a controller configured to control said displacing device so that an inclination angle of said supporting roller relative to a reference angle is set at a returning angle to return said endless belt toward the normal zone when the one end of said endless belt is detected by said first detector, and so that the inclination angle of said supporting roller is set at a balance angle to keep said endless belt in the normal zone when the mark of said endless belt is detected by said second detector.