Abstract: According to one embodiment, there is provided an image forming unit including: an image carrier; a charger; a latent image forming unit; a developing roller; and a regulating member. The charger charges the image carrier. The latent image forming unit forms a latent image on the image carrier. The developing roller is arranged to face the image carrier and develops the latent image with a developer including a carrier and a toner. The regulating member regulates a layer thickness of the developer of a surface of the developing roller. The regulating member extends in a direction approaching the developing roller. A magnetic force exerted by the developing roller at a tip end of the regulating member in an extending direction is 55 mT or less.

Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.

Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.

Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.

Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.

Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.

Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.

Abstract: A developing device includes a developing roller that carries a developer and faces an image carrier, a housing that supports the developing roller and supplies the developer to the developing roller, and a pressure reducing part that exists downstream of an opposite position to the image carrier in a rotation direction of the developing roller, and is formed in a wall of the housing located downstream of an airflow generated in a gap between the developer on the developing roller and an inner wall of the housing.

Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.

Abstract: A remaining toner quantity detector includes a detector to detect a projection formed on a toner bottle which is rotated, a counter configured to count the number of rotations of the toner bottle by the detector and integrate the count, and a discriminator configured to discriminate the toner quantity in the toner bottle on the basis of the integrated value by the counter.

Abstract: To provide a technology capable of realizing high-accuracy detection of toner density. A developing apparatus includes: a partition plate provided within the developing apparatus for partitioning an interior of the developing apparatus into a plurality of space; plural transport mixers each provided in the space within the developing apparatus partitioned by the partition plate and rotating for stirring and transporting a developer including toner and carrier; a density sensor provided in a transport path of the developer in one space of the plurality of space partitioned by the partition plate for detecting toner density of the stirred and transported developer; and retracting part for retracting an amount of the developer more than a predetermined amount into another space than the space in which the toner density is detected by the density sensor so that the amount of developer is constantly equal to or less than the predetermined amount near a toner density detection position by the density sensor.

Abstract: An image forming apparatus according to the present invention has a resin sheet 20 contacting a collecting roller 18 between a developing unit casing 11 and a collecting roller 18, wherein a scraper 18a which is provided on the collecting roller and projected over the total length scrapes toner adhered to the resin sheet 20, and the toner is ejected to a duct mechanism 115 provided under the resin sheet.

Abstract: To provide a technology capable of realizing high-accuracy detection of toner density. A developing apparatus includes: a partition plate provided within the developing apparatus for partitioning an interior of the developing apparatus into a plurality of space; plural transport mixers each provided in the space within the developing apparatus partitioned by the partition plate and rotating for stirring and transporting a developer including toner and carrier; a density sensor provided in a transport path of the developer in one space of the plurality of space partitioned by the partition plate for detecting toner density of the stirred and transported developer; and retracting means for retracting an amount of the developer more than a predetermined amount into another space than the space in which the toner density is detected by the density sensor so that the amount of developer is constantly equal to or less than the predetermined amount near a toner density detection position by the density sensor.

Abstract: An image forming apparatus according to the present invention has a resin sheet 20 contacting a collecting roller 18 between a developing unit casing 11 and a collecting roller 18, wherein a scraper 18a which is provided on the collecting roller and projected over the total length scrapes toner adhered to the resin sheet 20, and the toner is ejected to a duct mechanism 115 provided under the resin sheet.