| US 7,499,665 B2 | ||
| Belt device including an annular belt, and an image forming apparatus for detection of rotational angular speed or rotational angular displacement | ||
| Kazuosa Kuma, Kanagawa (Japan); Mitsuru Takahashi, Kanagawa (Japan); Kazuchika Saeki, Kanagawa (Japan); Tsutomu Katoh, Kanagawa (Japan); Takeshi Fukao, Kanagawa (Japan); and Yoshiharu Kishi, Kanagawa (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Feb. 17, 2006, as Appl. No. 11/355,880. | ||
| Claims priority of application No. 2005-078561 (JP), filed on Mar. 18, 2005. | ||
| Prior Publication US 2006/0210324 A1, Sep. 21, 2006 | ||
| Int. Cl. G03G 15/00 (2006.01); G03G 15/01 (2006.01) | ||
| U.S. Cl. 399—167 [399/301; 399/302] | 26 Claims |
| 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.
|