Ricoh Company, Ltd.

Yumi Inoue

Toshiki Hayashi

Yuuji Ishikura

Tatsuya Ohhira

A developing device includes a developer bearer, a first conveying screw conveying developer from one end to another end of a first conveyance path in a first direction, a second conveying screw conveying the developer in a direction opposite to the first direction in a second conveyance path, and a partition having a first communication port communicating the one end of the first conveyance path and the second conveyance path. A shaft diameter of the first conveying screw from one end to a position away from the first communication port by a first predetermined distance is smaller than a shaft diameter of another portion of the first conveying screw. A shaft diameter of the second conveying screw from one end to a position away from the first communication port by a second predetermined distance is larger than a shaft diameter of another portion of the second conveying screw.

Developing device, process cartridge, and image forming apparatus

A developing device of developing a latent image formed on an image bearer includes a developing roller, a developer regulator of a round-bar shape, and a holder. The developing roller carries developer. The developer regulator faces the developing roller to regulate an amount of the developer carried on a surface of the developing roller. The holder has a first hole, a second hole, and a projection. An end of the developer regulator is inserted in the first hole. A shaft at an end of the developing roller is inserted in the second hole. The projection protrudes toward an inside of the at least one of the first hole or the second hole and holds the end of the developer regulator and the shaft.

Developing device, process cartridge, and image forming apparatus including a holder which has projections within a hole accomodating a developer regulator or a developing roller

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Kanagawa, Japan

Yumi Inoue