Patent ID: 9575437
Date: 2017-02-21
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image bearing member configured to carry a toner image; a transfer unit configured to transfer the toner image from said image bearing member onto a transfer material, said transfer unit including a movable endless belt, a first stretching roller configured to stretch said belt, a second stretching roller configured to stretch said belt, and an adjusting unit configured to adjust movement of said belt in a widthwise direction of said belt by inclining said first stretching roller relative to said second stretching roller, wherein said transfer unit further includes a contacting member provided between said first stretching roller and said image bearing member in a moving direction of said belt and contacting with an inner surface of said belt, said contacting member is supported such that said contacting member contacts the inner surface of said belt at a position in an image bearing member side across a common internal tangent between a surface of said image bearing member and such a portion of a surface of said first stretching roller as is moved closest to said image bearing member by said adjusting unit, the common internal tangent contacting a portion of said image bearing member where said image bearing member contacts said belt and contacting a portion of said first stretching roller where said first stretching roller contacts said belt, and wherein said contacting member is supplied with a voltage to transfer the toner image from said image bearing member toward said belt.