Ricoh Company, Ltd.

Kohji Amanai

Yasuhisa Ehara

Michihito Ohashi

Toshio Shimazaki

Hideaki Sugata

Tetsuya Nakao

A transmission device includes a rotation shaft, a gear coaxially fixed to the rotation shaft by press-fitting, and a restriction member fixed to the rotation shaft for restricting perpendicularity of the gear to the axial line of the rotation shaft by pressing in contact with one end face of the gear so as to transmit the rotation of the driven gear onto the rotation shaft for rotating a photosensitive drum fixed to the rotation shaft. The rotation shaft can be fitted into a mounting hole of the gear with a small force so as to improve efficiency in assembling these components.

Image-forming apparatus

A driving device for driving a plurality of driven members of the present invention includes a first drive source for driving first one of the driven members. A second drive source drives second driven members other than the first drive member. An idler gear intervenes between the second driven members for transmitting the output torque of the second drive source. The second driven members are matched in rotation variation phase to each other during assembly.

Rotationally phase-matched driving device and image forming apparatus including the same

In an image forming apparatus of the present invention including a plurality of photoconductive drums arranged side by side, each photoconductive drum is configured to allow its opposite end portions in the main scanning direction to be adjusted in maximum eccentricity position in the direction of rotation independently of each other. The maximum eccentricity positions of the drums are capable of being matched in phase to each other in the direction of rotation at each of opposite end portions.

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Yokohama, Japan

Kohji Amanai