Kyocera Document Solutions Inc.

Kyocera Mita Corporation

Mita Industrial Co., Ltd.

Shingo Sakato

Takuji Watanabe

Kiyotaka Kobayashi

Eiji Nimura

Nariaki Tanaka

Toyotsune Inoue

Hiroka Itani

Hirohisa Endou

Eriko Hayashi

Masami Taniguchi

Hideki Takeda

Susumu Komaki

Katsuya Ota

Shuji Fujisawa

An image forming apparatus includes an image carrier carrying a toner image, a developing device, and a cleaning blade. The developing device carries out developing process feeding toner to the image carrier during image forming. The cleaning blade comes into contact with the image carrier and removes waste toner remained on the image carrier. In order to restrain turning-up of the cleaning blade, turning-up restraining process is carried out to feed the toner from the developing device to the image carrier during non-image forming, every time a given cumulative printing number of image forming operation is finished. In the turning-up restraining process, larger toner is fed to the image carrier as a given small size printing number in the cumulative printing number becomes larger.

Image forming apparatus that restrains turning-up of the cleaning blade

In an image forming apparatus, a resistance component of an inner impedance of an electricity removing member is equal to or lower than a value that is obtained by multiplying a calculated resistance value by a first specific value, the calculated resistance value being calculated based on a predetermined formula as a DC resistance value of the electricity removing member that is required to reduce a pre-electricity-removal potential of a photoconductor to a predetermined post-electricity-removal potential during an electricity removal time, the first specific value being calculated based on a ratio of a linear speed of the electricity removing member to a linear speed of the photoconductor, and a resistance component of the contact impedance of the electricity removing member is equal to or lower than a value that is obtained by multiplying the calculated resistance value by a second specific value that is calculated based on the ratio.

Electrophotographic image forming apparatus, and electricity removing member used in image forming apparatus

An image forming apparatus includes a photoconductor and an electricity removing member electrically grounded and disposed to be in contact with a surface of the photoconductor. In the image forming apparatus, with regard to a capacitance component of an inner impedance of the electricity removing member and a capacitance component of a contact impedance of the electricity removing member that are calculated from a Cole-Cole plot obtained from measurement by an AC impedance method in a predetermined frequency range, a value obtained by dividing the capacitance component of the contact impedance by the capacitance component of the inner impedance is equal to or lower than a predetermined first specific value, and the capacitance component of the inner impedance is equal to or lower than a predetermined second specific value.

Electrophotographic image forming apparatus and electricity removing member used in the same

An image forming apparatus includes a charging member, a charging bias power source, a developing member, a developing bias power source and a controlling device. The charging member electrically charged an image carrier. The charging bias power source applies a DC charging bias to the charging member. The developing member develops a toner image onto the image carrier. The developing bias power source applies an AC and DC developing bias to the developing member. The controlling device carries out, before image forming process, pre-charging control controlling the charging bias power source to electrically charge the image carrier. The controlling device carries out, after the image forming process is started, post-charging control controlling the charging bias power source and developing bias power source to adjust an electrical potential difference between a surface potential of the image carrier and developing bias to a significant electrical potential difference preventing occurrence of image failure.

Bias control and image forming apparatus comprising the same

An image forming apparatus includes a photosensitive drum, a charging roller, a transfer roller, a first bias application unit, a second bias application unit, and a control unit. The charging roller contains an ion conductive material. The first bias application unit applies a first bias to the charging roller. The second bias application unit applies a predetermined bias to the transfer roller. The control unit controls the first bias application unit not to apply the first bias to the charging roller in a non-image forming period in which a toner image is not formed on the photosensitive drum. The control unit controls the second bias application unit to apply the second bias, which is a bias that can electrically charge the surface of the photosensitive drum, to the transfer roller in the non-image forming period.

Image forming apparatus including a control unit controlling bias applied to a charging member and a transfer member

A grid wire cleaning mechanism is provided to prevent a reduction in image quality due to the surface of the electrostatic latent image carrier not being uniformly charged as a result of corona products adhering unevenly to the surface of the grid wires to extend the life of the grid wires and grid wire contact member. A first abrading memberabrades grid wires. A movement devicemoves the first abrading memberin the same direction as the direction of extension of the grid wires. A humidity measurement unitmeasures the humidity near the grid wires. The operation control unitoperates the movement devicewhen cleaning the grid wires, but does not operate the movement devicewhen the humidity measured by the humidity measurement unitexceeds a predetermined threshold value.

Grid wire cleaning mechanism

To provide an image forming device that is capable of preventing deterioration of the image quality through preventing deterioration of the toner even if frequency of making a copy is low. The image forming device includes: a developing part having a developing roller for achieving development by electrostatically attaching a toner onto an electrostatic latent image formed on a photoreceptor; a transferring part for transferring a developed toner image to a paper; and a cleaner part for removing and collecting the toner remained on the photoreceptor after transferring, wherein the developing roller is rotary-driven at a lower speed than a speed of development under a standby state. The image forming device includes a standby-state refresh control part for forcibly consuming an amount of the toner that is calculated based on accumulated time of the low-speed rotary drive.

Image forming apparatus

The present invention relates to a corona discharger displacing mechanism and a grid electrode positioning mechanism which are used for a unit of an image forming section in an image forming apparatus. The displacing mechanism causes a corona discharger to advance or retreat in synchronism with the inserting or extracting operation of the unit. On the other hand, the positioning mechanism stretches a grid electrode in co-operation with the unit.

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Osaka, Japan

Shingo Sakato