Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Konica-minolta Holdings, Inc.

Yasuo Shirodai

Yuji Kamoda

Kazuko Fukumoto

Kunitomo Sasaki

Yuya Sato

Masahiko Matsuura

Takeshi Maeyama

Naoki Yoshie

Makoto Fujii

Masahiro Onodera

Keiko Momotani

Kuniaki Kashiwakura

Eiji Tabata

An image forming apparatus includes: a fixer including fixing rotation body and pressing rotation body with a fixing nip therebetween, and heats and presses a fed sheet through the fixing nip to fix a toner image on the sheet to the sheet; and a hardware processor making a velocity difference between respective surface velocities of the fixing rotation body and the sheet passing through the fixing nip during a high-gloss mode operation to adjust a gloss of the toner image on the sheet. The hardware processor performs a control so that an absolute value of a velocity difference between respective surface velocities of the fixing rotation body and the pressing rotation body in press-contact when the sheet does not pass through the fixing nip is less than one between respective surface velocities of the fixing rotation body and the sheet when the sheet passes through the fixing nip during the high-gloss mode operation.

Image forming apparatus

An image forming apparatus includes: an image bearing body; a developing unit which develops an electrostatic latent image formed on the image bearing body as a toner image; a transfer unit which transfers the toner image to a receiver medium; a cleaning member which collects residual toner on the image bearing body; a lubricant supply unit which supplies lubricant onto the image bearing body; a measurement unit which measures a static frictional force generated between the image bearing body and the cleaning member; and a control unit which corrects the amount of lubricant on the image bearing body, wherein the control unit estimates a state of the lubricant on the image bearing body based on a change between a first and a second static frictional force, and based on the estimated state, the control unit selectively executes one of processing of supplying lubricant and processing of removing lubricant.

Image forming apparatus including a control unit for lubricant and image forming method

An image forming apparatus determines the amount of lubricant to be applied to an image bearing member on the basis of a history of toner image formation by image forming section, and in accordance with a result thus determined, adjusts the charging amount of a toner patch image formed by a toner patch image formation section.

Image forming apparatus, image formation system and control method

An image forming apparatus includes: an image carrier; a development unit configured to develop, as a toner image, an electrostatic latent image formed on the image carrier; a transfer unit configured to transfer the toner image to a medium to which a toner image is to be transferred; a cleaning unit configured to recover toner remaining on the image carrier after transferring the toner image; a lubricant supply unit configured to supply lubricant on the image carrier; a charge unit disposed between the development unit and the cleaning unit, along a surface of the image carrier; and a control unit configured to perform a first mode and a second mode, the first mode configured to form the toner image, the second mode configured to allow the charge unit to increase the amount of charge on toner reaching the cleaning unit relative to that in the first mode.

Image forming apparatus and image forming method

In a wet-type image forming apparatus, a plurality of patch images are successively transferred to a recording medium corresponding to a plurality of transfer biases obtained as bias value of the transfer bias is changed; density detecting unit measures image density of each of the plurality of patch images on the recording medium and detects a range of bias values of transfer bias in which the image density of patch image is substantially saturated; and the bias value of transfer bias when a normal image is formed on the recording medium is set to be within the range of bias values of transfer bias in which the image density of patch image is substantially saturated and to be not larger than absolute value of the bias value at which the image density of patch image is substantially saturated.

Wet-type image forming apparatus and method of setting transfer bias in wet-type image forming apparatus

A wet-type development device includes a draw-up roller and a conveyance roller rotating in contact with each other's surface, and a developer regulating member arranged facing to and keeping a distance from a nip section formed between the draw-up roller and the conveyance roller at the contact surface. The developer regulating member forms a storage space for storing developer to be supplied toward the nip section, on the upstream side of the nip section. The fluid level of developer in the vertical direction in the storage space is higher than the nip section when the developer is being supplied to the nip section.

Wet-type development device and wet-type image forming apparatus

Provided is a liquid development apparatus having a constitution in which liquid developer containing carrier liquid with toner dispersed therein is supplied from a liquid developer/cleaning liquid supply member on a pool forming member arranged facing to a supply roller so as to form a pool of the liquid developer, from which pool the liquid developer is supplied to the supply roller, wherein a liquid developer/cleaning liquid supply member supplies cleaning liquid on a pool forming member to form a suitable pooling portion of the cleaning liquid and the liquid developer remaining on the surface of the supply roller is removed and cleaned.

Liquid development apparatus and cleaning method that control either a gap between a pool forming member and a supply roller or a supply rate of a cleaning liquid

An image forming apparatus of the present invention comprises an image carrier, a lubricant application device that applies a first lubricant to the image carrier surface, and a developing device that houses a developer to which a second lubricant is added and develops the electrostatic latent image formed on the image carrier. Here, the pure water contact angle &#x3b8;of the first lubricant and the pure water contact angle &#x3b8;of the second lubricant have the following relationship, &#x3b8;. Furthermore, a frictional coefficient of the second lubricant may be larger than a frictional coefficient of the first lubricant.

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Hachioji, Japan

Yasuo Shirodai