Abstract: The image forming apparatus of the present embodiment has two limiters composed of a conventional high order limiter and a low order limiter, and carries out control to switch the limiter according to a temperature and a humidity so as not to reach a image contrast potential equal to or greater than those limiters. Carrier development can occur if image formation is performed in a state where the image contrast potential is high. Therefore, by providing a low order limiter as in the present embodiment and carrying out control so as not to exceed the low order limiter at the time of the image formation, an occurrence of the carrier development can be suppressed, and an image density can also be within a prescribed range.

Abstract: An image forming apparatus of an exemplary embodiment includes a temperature sensor, a developing unit, a supply unit, and a control unit. The temperature sensor detects a temperature. The developing unit supplies developer to an image carrier and performs development. The supply unit contains developer and supplies the contained developer to the developing unit. The control unit executes developer replacement processing including discharging the developer from the developing unit and supplying the developer contained in the supply unit to the developing unit based on a first ratio which a ratio of a developer supply time during which the supply unit performs supply of the developer for the developing unit and a drive time during which the developing unit is driven and a threshold value obtained based on a detected temperature of a temperature sensor.

Abstract: An image forming apparatus of an exemplary embodiment includes a temperature sensor, a developing unit, a supply unit, and a control unit. The temperature sensor detects a temperature. The developing unit supplies developer to an image carrier and performs development. The supply unit contains developer and supplies the contained developer to the developing unit. The control unit executes developer replacement processing including discharging the developer from the developing unit and supplying the developer contained in the supply unit to the developing unit based on a first ratio which a ratio of a developer supply time during which the supply unit performs supply of the developer for the developing unit and a drive time during which the developing unit is driven and a threshold value obtained based on a detected temperature of a temperature sensor.

Abstract: The image forming apparatus of the present embodiment has two limiters composed of a conventional high order limiter and a low order limiter, and carries out control to switch the limiter according to a temperature and a humidity so as not to reach a image contrast potential equal to or greater than those limiters. Carrier development can occur if image formation is performed in a state where the image contrast potential is high. Therefore, by providing a low order limiter as in the present embodiment and carrying out control so as not to exceed the low order limiter at the time of the image formation, an occurrence of the carrier development can be suppressed, and an image density can also be within a prescribed range.

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, an image processing apparatus includes a heating unit configured to heat an image formed on a sheet, and a control unit configured to control a temperature of the heating unit to be (i) above a first temperature when performing an image erasing operation on a first sheet supplied thereto, and (ii) below a second temperature that is lower than the first temperature when performing an image fixing operation on a second sheet supplied thereto. The control unit permits a first type of job to interrupt a currently-executing job while the image erasing operation is being performed and prohibits a second type of job from interrupting the currently-executing job while the image erasing operation is being performed.

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: An electrophotographic toner contains an electron donating color former compound, an electron accepting color developing agent, and a binder resin, wherein a toluene insoluble content in the electrophotographic toner is 10% by mass or more and 40% by mass or less, and the toner is decolorized by heating.

Abstract: An electrophotographic toner contains an electron donating color developable agent, an electron accepting color developing agent, and a polyester resin binder which is a polyester resin obtained by polycondensation of a carboxylic acid component and an alcohol component and has a crosslinked structure formed of a crosslinking component including at least either one of a trivalent or higher valent carboxylic acid and a trihydric or higher hydric alcohol, and is decolorized by heating.

Abstract: According to one embodiment, an image processing apparatus includes a heating unit configured to heat an image formed on a sheet, and a control unit configured to control a temperature of the heating unit to be (i) above a first temperature when performing an image erasing operation on a first sheet supplied thereto, and (ii) below a second temperature that is lower than the first temperature when performing an image fixing operation on a second sheet supplied thereto. The control unit permits a first type of job to interrupt a currently-executing job while the image erasing operation is being performed and prohibits a second type of job from interrupting the currently-executing job while the image erasing operation is being performed.

Abstract: An image forming apparatus including: a heating member which heats a toner image on a recording medium using a decolorizable toner containing a coloring agent containing a color developable compound and a color developing agent and having a capsule structure covered with an outer shell; a pressing member which is in press contact with the heating member to form a nip portion and nips and conveys the recording medium in cooperation with the heating member; a temperature control section which controls the temperature of the heating member to a temperature not higher than the density maintaining threshold temperature and not lower than the melting threshold temperature; and a conveyance control section which controls the conveying speed of the recording medium such that a time required for the recording medium to pass through the nip portion is 100 msec or more.

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, an image processing apparatus includes a heating unit configured to heat an image formed on a sheet, and a control unit configured to control a temperature of the heating unit to be (i) above a first temperature when performing an image erasing operation on a first sheet supplied thereto, and (ii) below a second temperature that is lower than the first temperature when performing an image fixing operation on a second sheet supplied thereto. The control unit permits a first type of job to interrupt a currently-executing job while the image erasing operation is being performed and prohibits a second type of job from interrupting the currently-executing job while the image erasing operation is being performed.

Abstract: An image forming apparatus includes a count section configured to count time during which no image forming is performed and a control section configured to allow heating of a heat generating section at temperature for decolorizing after the time counted by the count section reaches the a predetermined threshold time.

Abstract: An image forming apparatus comprises a feed section configured to feed a medium; an image forming section configured to form an image on the surface of the medium with a thermally erasable recording material or a recording material which is not thermally erasable; a heating section configured to heat the medium; a control section configured to conduct a control in a color erasing mode. The image forming apparatus also comprises a color erasing counter configured to count up, according to the size of the medium, the number of the mediums the color of which is thermally erased in the color erasing mode; and a print counter configured to count up, according to the size of the medium, the number of the mediums on which an image is fixed in the image formation mode.

Abstract: An image forming apparatus includes a count section configured to count time during which no image forming is performed and a control section configured to allow heating of a heat generating section at temperature for decolorizing after the time counted by the count section reaches the a predetermined threshold time.

Abstract: An image forming apparatus includes a count section configured to count time during which no image forming is performed and a control section configured to allow heating of a heat generating section at temperature for decolorizing after the time counted by the count section reaches the a predetermined threshold time.

Abstract: According to one embodiment, an image forming apparatus includes a mode setting section configured to set an operation mode in a manner that the image forming apparatus is operated in an erasing mode if an erasing operation is instructed, a supplying section configured to supply a medium on which the image formation is completed, and which is set in an designated or specified receiving section, a decoloring section configured to decolor the color of the formed image by carrying the medium to a heating section that includes at least heating and decoloring function, and a return section configured to return the operation mode to a predetermined mode except for the erasing mode from the erasing mode, when the last medium on which the image formation is completed and which is set in the receiving section is decolored.

Abstract: An image forming apparatus comprises a feed section configured to feed a medium; an image forming section configured to form an image on the surface of the medium with a thermally erasable recording material or a recording material which is not thermally erasable; a heating section configured to heat the medium; a control section configured to conduct a control in a color erasing mode. The image forming apparatus also comprises a color erasing counter configured to count up, according to the size of the medium, the number of the mediums the color of which is thermally erased in the color erasing mode; and a print counter configured to count up, according to the size of the medium, the number of the mediums on which an image is fixed in the image formation mode.