Mita Industrial Co., Ltd.

Hidehiro Fukui

Akira Nakakuma

Hideki Kita

Yasuyuki Fukunaga

Hiroyuki Deguchi

Yoshinobu Takemura

Toru Taniguchi

A multicolor developing device having a plurality of developing mechanisms for executing developing with differrent colors. The developing device includes a stationary frame member, a movable frame member mounted on the stationary frame member to reciprocally move in a predetermined direction, and a moving device for reciprocally moving the movable frame member. The plurality of developing mechanisms are mounted on the movable frame member and maintaining a distance in the said predetermined direction. Any one of the plurality of developing mechanisms is selectively positioned at a developing zone depending on the movement of the movable frame member. The moving device includes a screw device having a threaded shaft extending in the predetermined direction and a nut engaged with the threaded shaft, a stepping motor for rotating the threaded shaft, and a nonexcited operation-type electromagnetic brake. A pair of racks are disposed on the stationary frame member and maintain a distance in the lateral direction, and the movable frame member is provided with a rotary shaft extending in the lateral direction and a pair of pinions fitted to the rotary shaft, the pair of pinions being engaged with the pair of racks. Each of the developing mechanisms is provided with a pair of distance-setting rollers which are brought into resilient contact with a rotary drum in order to accomplish the positioning of the developing mechanism relative to the rotary drum.

Multicolor developing device with improved movable frame arrangement

Guided through a sliding member by a guide member set before a photoreceptor, a plurality of developing units approach the photoreceptor in turn and face the photoreceptor, thereby to develop, at an open portion of the guide member with being projected by an enforcing member.

Developing apparatus having developing units with a sliding member

Growing community of inventors

Hirakata, Japan

Hidehiro Fukui