Fujitsu Corporation

Masae Ikeda

Hideki Kamaji

Kazunori Hirose

Yukio Nishio

Teturou Nakashima

Hiroshi Nou

Masahiro Wanou

Masatoshi Kimura

Kunihiko Sato

Hiroyasu Ishijima

Shino Sakai

Akihiko Ishii

Yoshimi Takizawa

Masashi Ogasawara

Nobuo Suematsu

An electrophotographic recording apparatus includes a photosensitive drum on which an electrostatic latent image can be written, a developing device for developing the latent image of a charged visible image with a one-component developer, and a transferring device for electrostatically transferring the charged visible image from the drum to a sheet or paper. The developing device has a conductive foam rubber roller for entraining the developer to form a developer layer therearound and for bringing the layer to the drum for the development of the latent image, a conductive blade resiliently engaged with the foam rubber roller for uniformly regulating a thickness of the developer, and an electric source for applying electric energy to the blade to electrically charge the developer layer by a charge-injection effect. The transferring device has a conductive foam rubber transfer roller in contact with the drum, and an electric source for applying energy to the transfer roller to give a paper an electric charge having a polarity opposite to that of the charged visible image during a passage of a recording medium through a nip between the drum and the transfer roller.

Electrophotographic recording apparatus using developing device with one-component type developer and having combination of charge injection effect and conductive contact type charger

An image forming apparatus including an image transport member driven to rotate with a latent image formed on a surface thereof, and a toner transport member driven to rotate with toner attached thereto for developing the latent image and in contact with the image transport member to transport the toner to the image transport member. The image forming apparatus further includes a toner layer thickness regulating member disposed in pressure contact with the surface of the toner transport member to regulate the thickness of a layer of toner transported in a state of being attached to the surface of the toner transport member. The amount of charge of the toner on the surface of the toner transport member is regulated in the range of from -16 .mu.C/g to -19 .mu.C/g.

Image forming apparatus

A developing device is used to develop an electrostatic latent image with a one-component type developer, the latent image being formed on a photosensitive body. The device has a developing roller made of a conductive rubber, and a conductive sponge roller engaged with the developing roller to feed the developer to the developing roller. The rollers are rotated in the same direction, and the developer fed to a nip between the rollers is subjected to triboelectrification by the rollers, whereby the developer is electrically charged. The charged developer is electrostatically adhered to the surface of the developing roller due to an electrostatic image force acting therebetween. The sponge roller has a friction plate associated therewith, for effectively and additionally charging the developer. Also, the developing roller has a developer-removing plate associated therewith, for removing residual developer, not used for development of latent images, from the developing roller.

Developing device using one-component type developer

Developing apparatus having leaf spring member for regulating

Toner supplying member in a developing device used in an image forming

A toner image transferring device has a roller formed of a conductive rubber foam material having a resistivity of more than 10.sup.7 .OMEGA.cm. In a toner image transferring process, a constant current is applied to the roller, whereby a charged toner image can be transferred to a sheet or paper at a desired toner transfer efficiency regardless of a size of the paper or sheet. To remove a toner pollution of the roller, a constant voltage having a polarity opposite to that of the charged toner is applied to the roller. The roller is constituted such that pore openings appear over a surface of the roller, whereby a residual part of a toner polluting the roller will not leave a stain on a rear surface of the sheet or paper.

Conductive roller transfer device with improved transfer efficiency and

A one-component developing apparatus includes a developing roller which holds a one-component developer and feeds the developer to a photosensitive drum, and a developer layer thickness regulating blade. The regulating blade has an edge which is parallel with a surface of the developing roller and the edge regulates the thickness of the developer layer on the drum. The edge is constructed by being machined along a direction in parallel with the surface of the developer roller. The edge of the regulating blade may be either sharp or rounded.

One-component developing apparatus having a developer layer thickness

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Kawasaki, Japan

Masae Ikeda