Fitzpatrick, Cella Harper & Scinto
Image forming apparatus having a rotatable first developing member, and a fixed second developing member having a housing partially covering the first developing member
 An image forming apparatus including a rotatable developing member having a plurality of developing devices for developing an image bearing member at a first developing station, and a second single developing device arranged upstream of the rotatable developing member for developing the image bearing member exclusively at a second developing station different from the first developing station. The second developing device has a cover portion covering the rotatable developing member, and a portion of the cover portion is disposed at a position spaced apart from a rotation axis of the rotatable developing member by a predetermined length in a horizontal direction away from the image bearing member. The rotatable developing member rotates in an opposite direction with respect to the direction of rotation of the image bearing member to prevent toner from scattering toward the optical system. 
Canon Kabushiki Kaisha
G G
G03G G03G
additional inventional
Masahide Takashi Hiromichi Yasuo Tohru Masuo Katsuhiko Kimio Tohru Tatsuya Masami
Hirai Shibuya Yamada Yoda Kosaka Yamazaki Nishimura Nakahata Saitou Nakamura Takeda