Abstract: An image forming device including a forming unit, an adhesion amount detector, a correction coefficient determiner, and a correction unit. The forming unit forms line images each having a different line width. The adhesion amount detector detects a toner adhesion amount for each of the line images. The correction coefficient determiner determines, according to the toner adhesion amounts detected for each line width, correction coefficients for a gradation value of the line images of each line width. The correction unit corrects a gradation value of a line image using a correction coefficient corresponding to the line width of the line image when forming the line image.

Abstract: An image forming apparatus fixes a toner image onto a sheet by a fixer, and includes: a re-feeding path that normally conveys the sheet having passed through the fixer and guides the sheet toward the fixer; and a hardware processor that switches between first control to discharge the sheet having passed through the fixer toward a discharge destination and second control to re-feed the sheet having passed through the fixer to the fixer through the re-feeding path, depending on a type of an image which is a source of formation of the toner image.

Abstract: An image forming device comprises: a receiving part that receives image data containing first image data relating to a black and white image and second image data relating to a foil image; a carrying path along which a recording medium is carried in a predetermined direction; an inkjet printing part, arranged on the carrying path, injects an ink based on the first image data to the recording medium, and forms the black and white image or the color image on the recording medium; a toner image printing part, arranged on the carrying path, forms the toner image for adhesion based on the second image data, and transfers the toner image to the recording medium; and a foil image forming part, arranged on the carrying path, enables the toner image transferred to the recording medium to melt and attaches the foil to the melted toner image to form the foil image.

Abstract: An image forming apparatus fixes a toner image onto a sheet by a fixer, and includes: a re-feeding path that normally conveys the sheet having passed through the fixer and guides the sheet toward the fixer; and a hardware processor that switches between first control to discharge the sheet having passed through the fixer toward a discharge destination and second control to re-feed the sheet having passed through the fixer to the fixer through the re-feeding path, depending on a type of an image which is a source of formation of the toner image.

Abstract: An image forming device that prints a first image using first toner and prints a second image using foil on a sheet of paper, includes: a former that forms a first toner image by the first toner of the first image on the paper and forms a second toner image by second toner different from the first toner of the second image on the paper; a fixer that fixes the first toner image and the second toner image formed on the paper; a melter that melts the second toner out of the first toner and the second toner fixed to the paper; and a foil printer that prints the second image by bonding the foil to the melted second toner.

Abstract: An image forming device that prints a first image using first toner and prints a second image using foil on a sheet of paper, includes: a former that forms a first toner image by the first toner of the first image on the paper and forms a second toner image by second toner different from the first toner of the second image on the paper; a fixer that fixes the first toner image and the second toner image formed on the paper; a melter that melts the second toner out of the first toner and the second toner fixed to the paper; and a foil printer that prints the second image by bonding the foil to the melted second toner.

Abstract: An image forming apparatus for electrifying a surface of a photoreceptor with the use of an electrification member includes: a first output unit configured to output a first AC voltage; a second output unit configured to output a second AC voltage having the same frequency as a frequency of the first AC voltage and having a phase different from a phase of the first AC voltage; a superimposition unit configured to superimpose, on a DC component, an AC component containing at least one of the first AC voltage and the second AC voltage; and an application unit configured to apply a voltage that has been subjected to superimposition by the superimposition unit to the electrification member, wherein the superimposition unit changes the AC component to be superimposed on the DC component at a predetermined timing.

Abstract: An image forming apparatus for electrifying a surface of a photoreceptor with the use of an electrification member includes: a first output unit configured to output a first AC voltage; a second output unit configured to output a second AC voltage having the same frequency as a frequency of the first AC voltage and having a phase different from a phase of the first AC voltage; a superimposition unit configured to superimpose, on a DC component, an AC component containing at least one of the first AC voltage and the second AC voltage; and an application unit configured to apply a voltage that has been subjected to superimposition by the superimposition unit to the electrification member, wherein the superimposition unit changes the AC component to be superimposed on the DC component at a predetermined timing.

Abstract: For each of N imaginary regions divided at predetermined intervals in the direction of the rotation shaft of a developer roller (12), the amount of toner consumed when an image is formed is previously calculated. Then, the same amount of toner as a toner consumption amount calculated for each imaginary region is supplied to a development device (2) earlier by a time in which the toner supplied from a toner hopper (5) is transported to each imaginary region than at the time of the development. Thus, it is possible to maintain a toner concentration within the development device within a predetermined range without the toner being dispersed and an image formation speed being reduced even if an image having a high print rate is formed.

Abstract: An image forming apparatus includes an image carrier that carries a toner image, an image forming device that forms the toner image on the image carrier, a sensing device that senses a toner concentration of the image carrier and a control device that makes the image forming device form a test toner image on the image carrier, and determines necessity to execute each adjustment operation for adjusting a plurality of kinds of driving conditions for the image forming device at the time of forming the toner images, based upon a toner concentration of the test toner image.

Abstract: An image forming apparatus is provided which can execute an image stabilization operation and which includes: a determination portion that determines whether or not the image stabilization operation can be executed when a constituent member of the apparatus is replaced or when a consumable item is supplied; and an image stabilization control portion that executes the image stabilization operation when the determination portion determines that the image stabilization operation can he executed.

Abstract: There are provided a powder supply element adapted to supply powders containing at least toner; developing element adapted to develop an electrostatic latent image by agitating and conveying a developer containing the powders that are supplied by the powder supply element; a toner amount detecting element that is placed in the middle of a conveyance path to connect the powder supply element with the developing element and detects a toner amount per unit volume to be supplied to the developing element; and control element that controls a correction amount with respect to a reference supply amount due to the powder supply element on the basis of a toner amount per unit volume that is detected by the toner amount detecting element.

Abstract: For each of N imaginary regions divided at predetermined intervals in the direction of the rotation shaft of a developer roller (12), the amount of toner consumed when an image is formed is previously calculated. Then, the same amount of toner as a toner consumption amount calculated for each imaginary region is supplied to a development device (2) earlier by a time in which the toner supplied from a toner hopper (5) is transported to each imaginary region than at the time of the development. Thus, it is possible to maintain a toner concentration within the development device within a predetermined range without the toner being dispersed and an image formation speed being reduced even if an image having a high print rate is formed.

Abstract: The developing apparatus, having stirring members for conveying and stirring developer-tank-contained developer and a developer holder, comprises a developer replenishing tank; a magnetic-type toner concentration detecting sensor; a trickle-type discharging mechanism; conveying state switching device for temporarily blocking the flow of the developer-tank-contained developer and for temporarily switching the circulating state of the developer-tank-contained developer to the staying state thereof; and a controller for controlling replenishment operation for replenishing the toner and the carrier for replenishment to the developer tank when the toner concentration is lower than a predetermined reference toner concentration, wherein the controller determines the amounts of the toner and the carrier to be replenished on the basis of the calculated toner concentration and the estimated amount of the developer.

Abstract: An image forming apparatus includes an image carrier that carries a toner image, an image forming device that forms the toner image on the image carrier, a sensing device that senses a toner concentration of the image carrier and a control device that makes the image forming device form a test toner image on the image carrier, and determines necessity to execute each adjustment operation for adjusting a plurality of kinds of driving conditions for the image forming device at the time of forming the toner images, based upon a toner concentration of the test toner image.

Abstract: The developing apparatus, having stirring members for conveying and stirring developer-tank-contained developer and a developer holder, comprises a developer replenishing tank; a toner concentration detecting sensor; a trickle-type discharging mechanism; a developer amount estimating sensor; and a controller for controlling replenishment operation for replenishing the toner and the carrier for replenishment to the developer tank when the toner concentration is lower than a predetermined reference toner concentration, wherein the controller determines the amounts of the toner and the carrier to be replenished on the basis of the calculated toner concentration and the estimated amount of the developer.

Abstract: There are provided a powder supply means 23 adapted to supply powders containing at least toner; developing means 11 adapted to develop an electrostatic latent image by agitating and conveying a developer containing the powders that are supplied by the powder supply means 23; a toner amount detecting means 31 that is placed in the middle of a conveyance path to connect the powder supply means 23 with the developing means 11 and detects a toner amount per unit volume to be supplied to the developing means 11; and control means 6 that controls a correction amount with respect to a reference supply amount due to the powder supply means 23 on the basis of a toner amount per unit volume that is detected by the toner amount detecting means 31.

Abstract: A developer is appropriately replenished at the desired toner concentration even with bare minimum stirring. A developer container (11) in which a developer containing toner and carrier is received, a developer replenishing container (23) in which a developer containing toner and carrier is received and which replenishes the developer container (11) with the developer, a replenishment path (25) which connects a upper portion of the developer container 11 with an lower portion of the developer replenishing container (23), stirring member (24) for stirring the developer in the developer replenishing container (23), toner concentration detecting member (27) for detecting the toner concentration of the developer in the replenishment path (25), and control unit (6) for stirring the developer in the developer replenishing container (23) by controlling driving of the stirring member (24) on the basis of the toner concentration detected by the toner concentration detecting member (27) are provided.

Abstract: The developing apparatus, having stirring members for conveying and stirring developer-tank-contained developer and a developer holder, comprises a developer replenishing tank; a toner concentration detecting sensor; a trickle-type discharging mechanism; a developer amount estimating sensor; and a controller for controlling replenishment operation for replenishing the toner and the carrier for replenishment to the developer tank when the toner concentration is lower than a predetermined reference toner concentration, wherein the controller determines the amounts of the toner and the carrier to be replenished on the basis of the calculated toner concentration and the estimated amount of the developer.

Abstract: The developing apparatus, having stirring members for conveying and stirring developer-tank-contained developer and a developer holder, comprises a developer replenishing tank; a magnetic-type toner concentration detecting sensor; a trickle-type discharging mechanism; conveying state switching device for temporarily blocking the flow of the developer-tank-contained developer and for temporarily switching the circulating state of the developer-tank-contained developer to the staying state thereof; and a controller for controlling replenishment operation for replenishing the toner and the carrier for replenishment to the developer tank when the toner concentration is lower than a predetermined reference toner concentration, wherein the controller determines the amounts of the toner and the carrier to be replenished on the basis of the calculated toner concentration and the estimated amount of the developer.