Fuji Xerox Co., Ltd.

Nao Kato

Shota Makita

Iori Togu

Mutsumi Kikuchi

Shinichi Oba

Masayuki Shimoda

Kenji Hayamizu

Takashi Nakamura

Yusuke Kaji

A developing device includes a first developer transport path, called as first path hereinafter; a first transport screw that transports a developer in the first path; a first conveyance roller that is thicker than a shaft of the first transport screw, attracts by magnetic force the developer at a downstream end portion of a second developer transport path arranged next to the first path, and conveys the developer to an upper portion located upstream of the first path; a first scraping wall that scrapes and sends the attracted developer; and a first guide columnar body that is adjacent to the first conveyance roller, has a peripheral surface continuous to the first conveyance roller, receives, using the peripheral surface, and guides the sent developer to an upstream end portion of the first path, and has a length that the guided developer is not attracted by the magnetic force.

Developing device

An image forming apparatus includes an image carrier, a developing roller, a biasing member, and a fluctuation preventing member. A latent image is formed on the image carrier. The developing roller is provided to face the image carrier and develops the latent image on the image carrier. The biasing member is provided on an outside of an end portion of the developing roller and biases the image carrier and the developing roller in a direction where the image carrier and the developing roller approach each other. The fluctuation preventing member is interposed between the image carrier and the developing roller and prevents, along with the biasing member, a fluctuation in a distance between a surface of the developing roller and a surface of the image carrier in a region where the image carrier and the developing roller face each other.

Image forming apparatus and image forming unit

Provided is an image forming apparatus including an image carrier on which a latent image is developed, a developing roller that is provided to face the image carrier to perform development for the latent image of the image carrier, an urging unit that urges the image carrier and the developing roller so that the image carrier and the developing roller approach each other, and a distance regulating unit that includes a viscoelastic body that is deformed according to a change of a distance between the image carrier and the developing roller, and regulates at least one of a maximum value of the distance between the image carrier and the developing roller and a minimum value of the distance between the image carrier and the developing roller so that the distance between the image carrier and the developing roller falls within a predetermined range.

Developing roller support device including a viscoelastic body for regulating a distance between image carrier and developing roller

A developing device includes a housing including a container that holds a developer containing toner and a magnetic carrier, a feed port member that allows toner or a magnetic carrier to pass therethrough to be fed into the container, a rotary member spaced apart by a gap from a surrounding portion of the housing including the feed port member, the rotary member transporting the developer while holding the developer on an outer circumferential surface of the rotary member to cover the gap when a developer level of the developer inside the container exceeds a reference level, and a developer-level adjusting magnetic pole that holds the developer and that is located at the same level as an end of the gap located downstream from the feed port member in a rotation direction of the rotary member or located downstream from the end of the gap in the rotation direction.

Developing device and image forming apparatus having a developer-level adjusting magnetic pole

Provided is a developing system including a developing device that includes a replenishing unit that replenishes toner into an accommodating portion of a developer including toner and a carrier, via a replenishing port, a receiving unit that includes a transport member that transports received toner to a discharge port, a connecting member that has an internal space that is formed with an inlet connected with the discharge port and an outlet connected with the replenishing port, and a rotating member that is rotated in the internal space, and includes a blocking surface portion that closes the inlet and the outlet while passing over the inlet and the outlet, and a transport surface portion that receives or discharges the toner while passing over the inlet and the outlet.

Developing system and image forming apparatus

A developing device includes a storage unit that stores developer to be used to form a developer image on an image carrier, the developer containing toner and carrier, an auxiliary storage unit that stores the developer and is connected to the storage unit via a first opening from which the developer is supplied into the storage unit and a second opening from which the developer in the storage unit is taken in, a first transport member provided at the first opening to transport the developer in the auxiliary storage unit into the storage unit, a second transport member provided at the second opening to transport the developer in the storage unit into the auxiliary storage unit, and a supply unit that has an opening opposed to the first transport member and supplies toner to the developer transported from the auxiliary storage unit into the storage unit.

Developing device and image forming apparatus

Provided is an image forming apparatus including an image carrier on which a latent image is developed, a developing roller that is provided to face the image carrier to perform development for the latent image on the image carrier, an urging unit that urges the image carrier and the developing roller so that the image carrier and the developing roller approach each other, and a distance regulating unit that includes a viscoelastic body that is deformed according to a change of a distance between the image carrier and the developing roller, and regulates at least one of a maximum value of the distance between the image carrier and the developing roller and a minimum value of the distance between the image carrier and the developing roller so that the distance between the image carrier and the developing roller falls within a predetermined range.

Image forming apparatus, developing device, and developing roller support device including a distance regulating unit

Image forming apparatus and bearing

An image forming apparatus includes an image carrier that holds a developer image, a developer transport unit that transports a developer to the image carrier by performing a rotational movement, a voltage application unit that applies, between the developer transport unit and the image carrier, a voltage, which includes a direct-current (DC) voltage component and an alternating-current (AC) voltage component and which is used for moving the developer from the developer transport unit to the image carrier, and a density correction circuit that detects variations in a distance between the image carrier and the developer transport unit from variations in a waveform of an AC component of the voltage, which is applied by the voltage application unit, and that generates a control signal that causes the DC voltage component to change in such a manner that density variations due to the variations in the distance are corrected.

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Kanagawa, Japan

Nao Kato