Patent ID: 7499665
Filing Date: 2009-03-03
Classification: G03G

Abstract:
1. A belt device comprising: an annular belt spanned around at least two supporting rotational bodies; a supporting frame configured to rotatably support the supporting rotational bodies; a rotational member attached to one end of a rotational shaft of one of the supporting rotational bodies, having a plurality of marks arranged thereon, and configured to rotate integrally with the rotational shaft such that the marks are moved on a fixed orbit; a mark detector configured to detect the marks at a predetermined point on the fixed orbit; and a fixing member fixed to the supporting frame at, at least two points, wherein the mark detector is fixed to the fixing member, and the rotational member is rotatably supported at the one end with the supporting frame and the fixing member such that the rotational member is sandwiched between the supporting frame and the fixing member.