Abstract: An image forming apparatus and a method of controlling the same is provided. A plurality of cells formed at the surface of a transfer roller is filled with a developing agent to initialize the transfer roller, thereby suppressing contamination and electrical non-uniformity of the transfer roller. A method of controlling an image forming apparatus includes determining whether a transfer roller mounted in the image forming apparatus is a new one and, upon determining that the transfer roller is a new one, feeding a developing agent to the surface of the transfer roller and filling a plurality of cells formed at the surface of the transfer roller with the developing agent to initialize the transfer roller.

Abstract: An image forming apparatus includes an image carrier on which a developer image is formed, a transfer roller disposed to be in contact with the image carrier to form a transfer nip and to transfer the developer image formed on the image carrier onto a print medium, a print medium guide member to guide the print medium that has passed through the transfer nip to a fixing unit, and a print medium supporting member rotatably disposed between the transfer roller and the print medium guide member, and comprising a first contacting portion to be in contact with the print medium that has passed through the transfer nip and a second contacting portion that, when the first contacting portion is rotated by the print medium, is rotated integrally with the first contacting portion so as to be in contact with a rear surface of the print medium.

Abstract: An image forming apparatus and method are provided. The image forming apparatus includes a communication interface unit that receives printing data, an image forming unit that performs an ordinary printing to form an image on printing paper based on the printing data, a paper supplying unit that provides the printing paper to the image forming unit along with a paper supplying route, a determination unit that determines whether a functional printing may be performed on the paper supplying route in an interval section between sheets of the printing paper, and a controller that controls the image forming unit to perform a functional printing, wherein the ordinary printing is a printing performed on one or more sheets of printing paper, and the functional printing is a printing performed in an interval section between the sheets of printing paper.

Abstract: An image forming apparatus and a method of controlling the same is provided. A plurality of cells formed at the surface of a transfer roller is filled with a developing agent to initialize the transfer roller, thereby suppressing contamination and electrical non-uniformity of the transfer roller. A method of controlling an image forming apparatus includes determining whether a transfer roller mounted in the image forming apparatus is a new one and, upon determining that the transfer roller is a new one, feeding a developing agent to the surface of the transfer roller and filling a plurality of cells formed at the surface of the transfer roller with the developing agent to initialize the transfer roller.

Abstract: An image forming apparatus includes a plurality of developing devices to develop toners of different colors on an image carrier; a power supply to supply the plurality of developing devices with a first voltage to develop the toners on the image carrier; a switching unit to connect the power supply to one of the plurality of developing devices; and a voltage divider to supply some of the other developing devices that are not connected to the power supply with a second voltage to prevent toner development and to supply any other remaining developing device with a third voltage, an absolute value of which is less then an absolute value of the second voltage.

Abstract: An image forming apparatus and method are provided. The image forming apparatus includes a communication interface unit that receives printing data, an image forming unit that performs an ordinary printing to form an image on printing paper based on the printing data, a paper supplying unit that provides the printing paper to the image forming unit along with a paper supplying route, a determination unit that determines whether a functional printing may be performed on the paper supplying route in an interval section between sheets of the printing paper, and a controller that controls the image forming unit to perform a functional printing, wherein the ordinary printing is a printing performed on one or more sheets of printing paper, and the functional printing is a printing performed in an interval section between the sheets of printing paper.

Abstract: An image forming apparatus to form image data on a printing medium, the apparatus includes a developing cartridge having a developer transfer body to transfer developer to an image receptor, a developer storing unit to separately store a transfer-regulated developer which has been transfer-regulated in the developer transfer body and a non-transferred developer which is not transferred to the developer transfer body, and a used developer storing unit to store a used developer separated from a surface of the photoreceptor; a printing information storing unit to store cartridge printing information of the developing cartridge; and a controller to calculate an average printing density on a basis of the cartridge printing information, and to control the developing cartridge so that an amount in which the transfer-regulated developer of the developer storing unit is transferred to the used developer storing unit can exceed a reference amount if the calculated average printing density is below a reference printing

Abstract: An image forming apparatus includes a power supply supplying a plurality of developing devices with a first voltage to develop toners on an image carrier, and a voltage divider supplying some of the developing devices not connected to the power supply with the first voltage or a second voltage.

Abstract: An image forming apparatus to form image data on a printing medium, the apparatus includes a developing cartridge having a developer transfer body to transfer developer to an image receptor, a developer storing unit to separately store a transfer-regulated developer which has been transfer-regulated in the developer transfer body and a non-transferred developer which is not transferred to the developer transfer body, and a used developer storing unit to store a used developer separated from a surface of the photoreceptor; a printing information storing unit to store cartridge printing information of the developing cartridge; and a controller to calculate an average printing density on a basis of the cartridge printing information, and to control the developing cartridge so that an amount in which the transfer-regulated developer of the developer storing unit is transferred to the used developer storing unit can exceed a reference amount if the calculated average printing density is below a reference printing

Abstract: An image forming apparatus which measures resistance of a recording medium on which an image formed and applies a transfer voltage corresponding to this resistance to the recording medium, thereby improving a duplex printing quality.

Abstract: A charging voltage controller of an image forming apparatus includes a charging roller charging a photoconductive drum with a predetermined charging voltage, a high voltage supply unit supplying the predetermined charging voltage to the charging roller, an electric current detecting unit detecting an electrical current flowing the charging roller, and a control unit supplying first and second test voltages of different degrees to the charging roller, determining a first reference voltage to be applied to the charging roller based on data from the electric]current detecting unit outputted in response to the first test voltage, calculating slope data based on the electrical current data detected from the electric current detecting unit in response to the first and second test voltages, and determining the charging voltage to be applied to the charging roller as a sum of the first reference voltage and a preset offset voltage that corresponds to the slope data.

Abstract: A charging voltage controller of an image forming apparatus includes a charging roller charging a photoconductive drum with a predetermined charging voltage, a high voltage supply unit supplying the predetermined charging voltage to the charging roller, an electric current detecting unit detecting an electrical current flowing the charging roller, and a control unit supplying first and second test voltages of different degrees to the charging roller, determining a first reference voltage to be applied to the charging roller based on data from the electric]current detecting unit outputted in response to the first test voltage, calculating slope data based on the electrical current data detected from the electric current detecting unit in response to the first and second test voltages, and determining the charging voltage to be applied to the charging roller as a sum of the first reference voltage and a preset offset voltage that corresponds to the slope data.

Abstract: A device and method for controlling a transfer voltage in an electrophotographic recording apparatus for printing by the page. In the transfer voltage controlling device, a high voltage generator generates a transfer voltage, an exposer starts and stops an exposure in response to a first exposure signal and a second exposure signal, respectively, a transfer roller transfers an image by high pressure with the transfer voltage received from the high voltage generator, and an engine controller generates the first exposure signal for starting an exposure for one page and the second exposure signal for terminating the exposure for the page, and causes the high voltage generator to supply or stop the transfer voltage to the transfer roller upon generation of the first exposure signal or the second exposure signal, respectively.