Patent ID: 11953846
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. An image forming apparatus according to claim 1, further comprising an upstream roller provided adjacent to said inner roller and upstream of said inner roller with respect to a rotational direction of said intermediary transfer belt, said upstream roller configured to stretch said intermediary transfer belt while in contact with an inner surface of said intermediary transfer belt, and
in a cross-section substantially perpendicular to a rotational axis direction of said inner roller, when a common tangential line between said inner roller and said upstream roller on a side where said intermediary transfer belt is stretched by said inner roller and said upstream roller is a reference line L1, a rectilinear line passing through a rotation center of said inner roller and substantially perpendicular to the reference line L1 is an inner roller center line L2, a rectilinear line passing through a rotation center of said outer roller and substantially perpendicular to the reference line L1 is an outer roller center line L3, and a distance between the inner roller center line L2 and the outer roller center line L3 is an offset amount X (provided that the offset amount X is a positive value when the outer roller center line L3 is positioned upstream of the inner roller center line L2 with respect to the rotational direction of said intermediary transfer belt), said position changing mechanism changes the offset amount X by changing the position of said inner roller.