Ricoh Company, Ltd.

Minnesota Mining and Manufacturing Company

Masashi Nakayama

Hiroyuki Mabuchi

Yukio Otome

Noriyuki Kamiya

Hiroya Abe

Takashi Innami

Rei Suzuki

Yuusuke Arai

Naohiro Nagafuchi

Yuki Moro

Yoshihiro Fukase

Soichiro Fukutomi

A roller includes a cylindrical body having openings on both ends thereof and a press-fit member fitted in at least one of the openings of the cylindrical body with an outer circumferential face thereof in contact with an inner face of the cylindrical body. The outer circumferential face of the press-fit member is grooved obliquely to an axis of the cylindrical body, and the inner face of the cylindrical body is smooth at least in a portion that contacts the outer circumferential face of the press-fit member.

Roller, developing roller, developing device, process cartridge, and image forming apparatus

A powder feeding device includes a powder container, a feeding tank in communication with the powder container, a negative pressure room in communication with the feeding tank via a suction port communicating tube; an air suction device in communication with the negative pressure room via a negative pressure room communication tube; a suction port opening and closing unit that opens and closes the suction port communicating tube; a negative pressure room opening and closing unit that opens and closes of the negative pressure room communication tube; an output port opening and closing unit that opens and closes an output port of the feeding tank; and a controller that performs negative pressure generation control, powder supply control, and powder discharge control. Further, the controller simultaneously starts the negative pressure generation control and the powder discharge control.

Powder feeding device having negative pressure generation control and power discharge control and image forming apparatus

Powder feeding device having negative pressure generation control and powder discharge control and image forming apparatus

A split abrasive roll is provided, including cooperative engaging members (3) disposed on both the rotatable shaft (2) of an abrasive machine and the inner surface of the roll member. The cooperative engaging members affix the center portion of the split abrasive roll to the shaft, while preserving a uniform abrasive outer surface. The respective ends (3b) of each of the roll members are also retained, and the split abrasive roll so provided tends to overcome the deficiencies in the split abrasive rolls of the prior art.

Split abrasive roll attachment system

Growing community of inventors

Kanagawa, Japan

Masashi Nakayama