Kyocera Document Solutions Inc.

Kyocera Mita Corporation

Katsuya Ota

Jun Nakai

Takeshi Watanabe

Kiyotaka Kobayashi

Takahiko Murata

Masahito Ishino

Mitsuhiro Goda

Susumu Hanano

Masahiko Kobayashi

Akira Matayoshi

Hirofumi Tsuji

Ai Takagami

Chisato Hatakeyama

Chikara Ishihara

Shinji Yamane

Norio Tomiie

Yoshimi Shimizu

Shingo Sakato

Yuki Matsui

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

An image forming apparatus includes: an image carrier, a developing section, a transfer roller, a power supply section, a conveyance roller, and an operation control section. The operation control section has a cleaning operation mode and an image formation operation mode where images are formed on recording paper. In the cleaning operation mode, the operation control section causes the developing section to supply a predefined amount of toner to a circumferential surface of the image carrier, causes the power supply section to apply a bias of a polarity opposite to a normal charge polarity to the transfer roller, then causes the conveyance roller to convey a single piece of recording paper, causes the conveyance roller to stop rotating operation when the recording paper is located in a nip area, and causes the image carrier and the transfer roller to rotate while the recording paper is stopped in the nip area.

Image forming apparatus

A drum cleaning device includes a toner supply roller, a toner layer restricting member, and a toner receiving member. The toner layer restricting member includes an inclined portion formed in a lateral region outside of an image forming region to incline gradually away from a surface of a cleaning roller with increasing distance from an inner side of the lateral region. The toner receiving member includes a lower-level upper end portion provided in the lateral region outside of the image forming region, the lower-level upper end portion being located below a second contact region where the cleaning roller and the toner supply roller come into contact with each other. The inclined portion is disposed in a region overlapping the lower-level upper end portion.

Cleaning device and image forming apparatus

A static eliminating device includes: a housing; a substrate mounted to the housing; a light-emitting part mounted on a mounting surface of the substrate; a partition member connected to the housing to cover the substrate and the light-emitting part and face a portion of the housing to which the substrate and the light-emitting part are mounted so that an opening facing the surface of the image carrier is formed in a light-emitting region across which light is delivered from the light-emitting part to the surface of the image carrier; and a restricting protrusion abutting at a distal end thereof against the partition member to support the partition member and restricting the position of the partition member to ensure the formation of the opening. A distal side portion of the restricting protrusion located within the light-emitting region has a tapered shape narrowing with approach toward the partition member.

Static eliminating device and image forming apparatus

The light emitting portionsare mounted on the substrate, and emit neutralization light. The first end engagement portionis engaged with the first end portionof the substrateopposite to the image carrier. The partitioning memberis connected to the housing, so as to form an opened portion that is opened to face the surface of the image carrier. The plurality of restriction protrusionsare arranged along an axial direction of the image carrier. The first end engagement portionis disposed in the central portion of the plurality of restriction protrusionsin the arrangement direction. The arrangement direction of the plurality of restriction protrusionscurves, such that a central portion of the restriction protrusions in the axial direction is closer to the image carrier than end portions of the restriction protrusions in the axial direction.

Neutralization device and image forming apparatus

A charging device includes a housing, a charging roller, and a brush roller. The housing is disposed adjacent to an optical path of light emitted an the exposure device to irradiate a photoconductor. Charging roller is rotatably supported in housing, and is configured to charge a circumferential surface of the photoconductor through contact. Brush roller is rotatably supported in housing together with charging roller, has multiple brush hairs flocked on a base shaft thereof extending in a longitudinal direction of the charging roller, and is configured to clean a surface of charging roller when brush hairs are brought in contact with charging roller. Furthermore, a predetermined segment of housing is located in a space within a predetermined distance toward a side of housing from the optical path, and is formed from a material having a charge property equivalent to that of the brush hairs.

Charging device, and image forming apparatus including the same

A cleaning apparatus is provided with a cleaning roller that is positioned so as to be in contact with a photosensitive drum, and with a toner layer thickness regulating member that regulates the thickness of a toner layer adhering to the surface of this cleaning roller. The toner layer thickness regulating member is formed by a toner layer thickness regulating roller that rotates in contact with the cleaning roller.

Cleaning apparatus and image forming apparatus

The present invention provides an image forming apparatus and an image forming method capable of preventing excessive charging in the toner within the cleaning device for effectively preventing generation of the black spots derived from the leak current. In the image forming apparatus comprising a cleaning device having a cleaning blade for scraping out the toner on a latent image carrier body surface and the image forming method using the same, the toner contains a titanium oxide as an additive agent, and with the premise that the fluorescence X ray intensity of the titanium oxide added to the toner before use is X, and the fluorescence X ray intensity of the titanium oxide added to the toner within the cleaning device is X, Xand Xsatisfy the following relationship formula (1):2/1&#x2267;1.2&#x2003;&#x2003;(1).

Cleaning device and method for an electrophotographic photoconductor

Image transfer method and apparatus in which scratches due to entrainment of particles on an image carrier for a toner image having maximum spectroreflectivity at a wavelength of 550 nm do not produce perceptible flaws in resulting images transferred to a recording medium, since images formed with toner of maximum spectroreflectivity at 550 nm on white recording medium are difficult for human eyes to discern. When cleaning residual toner from transfer belts, reverse bias voltage is applied to at least one transfer roller, the peripheral velocity of the photosensitive drum on which a yellow toner image having maximum spectroreflectivity at 550 nm is formed is allowed to differ from the transfer velocity of the transfer belt, and at least the photosensitive drum on which the yellow toner image of maximum spectroreflectivity at 550 nm is formed is detached from the transfer belt.

Color image forming method and apparatus with image flaw reducing speed control of toner image carrier peripheral velocity

A developing device,has a cover member,for covering an upper part of a developing roller,. A seal,at a front end of the cover member,is brought into contact with a peripheral surface of a photosensitive drum,. When toner particles are accumulated in the vicinity of a front end of the seal,, the toner particles adhere to the photosensitive drum,, so that an undesirable black strip appears. Therefore, a voltage in a range from a developing bias to a potential at which the photosensitive drum,is charged is applied to a cover plate,of the cover member,. The seal,is at a high potential which is the same in polarity as the potential at which the photosensitive drum,is charged. Accordingly, no toner particles are accumulated at a front end of the seal,, so that no black stripe appears.

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Osaka, Japan

Katsuya Ota