Canon Kabushiki Kaisha

Komatsu Corporation

Kensuke Sato

Masaaki Sato

Tetsushi Uneme

Toshiki Fujino

Yosuke Kashiide

Hiroyuki Munetsugu

Koji Wada

Goshi Ozaki

Masanori Kudo

Koji Yamamoto

Yusuke Hiratsuka

Kazuya Hashimoto

Tachio Kawai

Yu Fukasawa

Takashi Kimura

Yukio Kubo

Naoki Hayashi

Hideki Nagae

A machine component includes a core made up of a steel for machine structural use, and a medium carbon-containing layer and a high carbon-containing layer formed of the steel for machine structural use, the medium carbon-containing layer covering the core, the high carbon-containing layer covering the medium carbon-containing layer and having a carbon concentration of 0.8-1.5%. The high carbon-containing layer is made up of a martensitic structure having carbides dispersed therein and a residual austenitic structure, wherein spheroidized carbides with an aspect ratio of 1.5 or less constitute 90% or more of a total number of the carbides, and the number of spheroidized carbides on prior austenite grain boundaries is 40% or less of the total number of the carbides.

Machine component

A method for producing a machine component excellent in pitting resistance characteristics and toughness includes a carburizing step, performed on a steel material containing 0.13-0.30% C and 0.90-2.00% Cr in mass % and at least one of Si, Mn, Ni, Mo, Nb, V, Ti, B, Al, and N, balance Fe and unavoidable impurities; heating the material to 850-1030&#xb0; C. to attain carbon concentration in a surface of 0.8-1.5%; cooling the material at an average rate of 5&#xb0; C./sec or lower from a temperature higher than the Apoint of a surface layer to a cooling end temperature that is at least 50&#xb0; C. lower than the Apoint to cause the surface layer to have a pearlite or bainite structure with dispersion; spheroidizing annealing at a temperature not higher than the Apoint at the surface layer; heating the material to not higher than the Apoint at the surface layer; and performing tempering.

Method for producing machine component

A cartridge includes a coupling member, a transmitted member, and a rotary member. The transmitted member includes an accommodating portion configured to accommodate the coupling member, and a protruded portion integrally formed with an inner wall of the accommodating portion and protruding from the inner wall toward an inside of the accommodating portion. The coupling member includes a free end portion having a rotational force receiving portion that receives a rotational force, a connected portion connected to the transmitted member in such a manner that at least a part of the connected portion can be accommodated in the accommodating portion, and a recessed portion provided at the connected portion so that the protruded portion can enter. An inclination angle of a rotation axis of the coupling member relative to a rotation axis of the transmitted member is variable.

Cartridge, rotary unit, and image forming apparatus

Process cartridge for image forming apparatus

Coupling for process cartridge for image forming apparatus

A developing cartridge includes a developing rollerthat develops, by way of a developer, an electrostatic latent image that is formed on an image bearing member; a developer regulating member that regulates the thickness of a developer carried on the developing roller; and a framethat rotatably supports the developing rollerand supports the developer regulating member. The framehas a developing roller support sectionthat rotatably supports an outer peripheral faceof at least one end of the developing roller. The developing roller support sectionhas a clearance at a position that, when viewed in the axial direction of the developing roller, overlaps a contact region at which the developing rolleris in contact with the image bearing member

Developing cartridge, process cartridge and image forming apparatus

Developing cartridge having a frame rotatably supporting a developing roller

A developing device includes a developer carrying member for carrying a magnetic developer to form a developer image on an image bearing member; a developing device frame including a first accommodating chamber for accommodating the magnetic developer and including a second accommodating chamber, in which the developer carrying member is provided, for accommodating the magnetic developer supplied from the first accommodating chamber through a first opening; a removable sealing member for sealing the first opening; and a magnetic seal, provided between a longitudinal end portion of the developer carrying member and the developing device frame. The sealing member is removable through a second opening which is defined at least partly by the magnetic seal.

Developing device

Growing community of inventors

Yokohama, Japan

Kensuke Sato