US 2010/0247120 A1Published application

Image forming apparatus

AssigneeFuji Xerox Co., Ltd.

InventorsShigemi Murata, Makoto Kanno

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Abstract

An image forming apparatus includes an image forming device, a time detection unit, a humidity measurement unit and a controller. The image forming device includes a photoconductive body, a developing device and a transfer device. The time detection unit detects information concerning a stop time period of the developing device. The humidity measurement unit is provided in a casing in which the image forming device is provided and measures a humidity. The controller controls a developer supply member in the developing device based on the information concerning the stop time period detected by the time detection unit and information concerning the humidity measured by the humidity measurement unit, so as to rotate at a lower speed than a rotation speed at a normal time before the developing device starts a first developing operation after the developing device stopped.

Claims10

Dependent claims

An image forming apparatus comprising:

an image forming device including
a photoconductive body that rotates, an electrostatic latent image being formed on the photoconductive body,
a developing device that develops the electrostatic latent image on the photoconductive body with a developer to form a developer image, the developer being supplied by a developer supply member which rotates and to which a developing voltage is applied;
and
a transfer device that transfers the developer image onto a recording medium;
a time detection unit that detects information concerning a stop time period of the developing device;
a humidity measurement unit that is provided in a casing in which the image forming device is provided and that measures a humidity;
and
a controller that controls the developer supply member in the developing device based on the information concerning the stop time period detected by the time detection unit and information concerning the humidity measured by the humidity measurement unit, so as to rotate at a lower speed than a rotation speed at a normal time before the developing device starts a first developing operation after the developing device stopped.

6 more elements

An image forming apparatus comprising:

an image forming device including
a photoconductive body that rotates, an electrostatic latent image being formed on the photoconductive body,
a developing device that develops the electrostatic latent image on the photoconductive body with a developer to form a developer image, the developer being supplied by a developer supply member which rotates and to which a developing voltage obtained by superposing an AC component on a DC component is applied, and
a transfer device that transfers the developer image onto a recording medium;
a time detection unit that detects information concerning a stop time period of the developing device;
and
a controller that controls the image forming device based on the information concerning the stop time period detected by the time detection unit, so as to execute an image forming operation in a state where it is stopped to apply the AC component of the developing voltage to the developing device.

4 more elements

An image forming apparatus comprising:

an image forming device including
a photoconductive body that rotates, an electrostatic latent image being formed on the photoconductive body,
a developing device that develops the electrostatic latent image on the photoconductive body with a developer to form a developer image, the developer supplied by a developer supply member which rotates and to which a developing voltage obtained by superposing an AC component on a DC component is applied, and
a transfer device that transfers the developer image to a recording medium;
a time detection unit that detects information concerning a stop time period of the developing device;
and
a controller that controls the image forming device based on the information concerning the stop time period detected by the time detection unit so as to execute an image forming operation in a state where a duty ratio of a voltage waveform of the AC component of the developing voltage applied to the developing device is changed to such a value that a ratio of a waveform portion which forms an electric field for attracting the developer from the developer supply member to the photoconductive body becomes smaller than that at a normal time.

4 more elements

Dependencies are inferred from the claim text.