Abstract: A developing unit includes a waste toner housing having an upper housing and a lower housing which face each other, at least one support unit to allow connection between the upper and lower housings, and to support facing surfaces of the upper and lower housings, and a toner housing which is disposed on a lower part of the waste toner housing and is spaced apart from the waste toner housing at a predetermined distance. Accordingly, the waste toner housing is prevented from being deformed by heat and pressure, and thus white lines on images, flowback of waste toner and insufficient cleaning, which are caused by interference with the light path due to deformation of the waste toner housing, can be reduced. Additionally, tolerance can be greatly reduced as a result of resolving the problem of deformation of the waste toner housing, so a developing unit having a smaller size can be provided.

Abstract: A cleaning apparatus include a cleaning member to remove a waste toner remaining in a photoconductive medium and a housing to support the cleaning member, including a waste toner admission portion to provide a transfer path of the waste toner removed by the cleaning member, and a waste toner collecting portion to store the waste toner. The housing has a first thickness corresponding to the waste toner admission portion and a second thickness corresponding to the waste toner collecting portion so that the first thickness is smaller than the second thickness.

Abstract: An image developing apparatus includes an upper case; a lower case disposed on a lower side of the upper case, and internally housing a developing agent, and having an opening. A photoconductive drum is disposed on the upper case for forming an electrostatic latent image on a surface thereof. A charging roller is disposed on one side of an outer circumference of the photoconductive drum for charging the photoconductive drum. A developing roller having one part is exposed through the opening of the lower case to cooperate with the photoconductive drum for developing the electrostatic latent image. A scattering preventing unit disposed between the photoconductive drum and the developing roller, to prevent scattering of the developing agent supplied by the developing roller. The scattering preventing unit includes a blocking curtain which covers a part of the opening and having one side in contact with the outer circumference of the photoconductive drum.

Abstract: A waste toner transfer device of an image forming apparatus includes a waste toner transfer unit which is disposed in proximity to a cleaning member to transfer waste toner removed from a photoconductive medium by the cleaning member, and includes a plurality of protrusions at one end, a driving unit which horizontally reciprocates the waste toner transfer unit, and a plurality of ribs which constrain the plurality of protrusions when the waste toner transfer unit moves, so that the waste toner transfer unit vibrates vertically.

Abstract: An image forming apparatus having the improved construction and mounting structure of a device for charging paper to be attached to a paper feed body is disclosed. The image forming apparatus includes a plurality of developing devices and a paper feed body which is mounted opposite to the plurality of developing devices and rotates to feed paper. A sheet member is mounted to a developing device of the plurality of developing devices, which is disposed on an uppermost paper stream side in a feeding direction of the paper. The sheet member charges the paper as it advances to the paper feed body to attach the paper to the paper feed body. The image forming apparatus further includes a voltage transmission part which transmits high voltage to the sheet member.

Abstract: A toner cartridge horizontally installed in an electrophotographic printer having a photoreceptor drum where an electrostatic latent image is formed by charging and exposure, and contributing to toner supply and development by being fixedly coupled to in the electrophotographic printer. The toner cartridge includes a housing filled with toner of a predetermined color, a development roller rotatably installed on the housing to face the photoreceptor drum and to supply the toner to the photoreceptor drum to develop an image by a difference in electrical potential, a supply roller rotatably installed in the housing in contact with the development roller and to control the toner to adhere to the development roller, and a guide member coupled to the housing to be disposed under the supply roller and to guide supply of the toner. When a diameter of the development roller is D2, the diameter D2 satisfies an inequality that 10.4?D2?22.1 mm.

Abstract: An image developing apparatus includes an upper case, and a lower case having an opening and containing a developing agent on a lower side of the upper case. A photoconductive drum in the upper case forms an electrostatic latent image on a surface thereof. A charging roller charges the photoconductive drum. A developing roller having one part is exposed through the opening of the lower case to cooperate with the photoconductive drum for developing the electrostatic latent image. A scattering preventing unit disposed between the photoconductive drum and the developing roller, to prevent scattering of the developing agent. The scattering preventing unit includes a blocking curtain covering part of the opening and one side in contact with the outer circumference of the photoconductive drum.

Abstract: A toner cartridge horizontally installed in an electrophotographic printer having a photoreceptor drum where an electrostatic latent image is formed by charging and exposure, and contributing to toner supply and development by being fixedly coupled to in the electrophotographic printer. The toner cartridge includes a housing filled with toner of a predetermined color, a development roller rotatably installed on the housing to face the photoreceptor drum and to supply the toner to the photoreceptor drum to develop an image by a difference in electrical potential, a supply roller rotatably installed in the housing in contact with the development roller and to control the toner to adhere to the development roller, and a guide member coupled to the housing to be disposed under the supply roller and to guide supply of the toner. When a diameter of the development roller is D2, the diameter D2 satisfies an inequality that 10.4?D2?22.1 mm.

Abstract: A toner cartridge of an electrophotographic image forming apparatus. The toner cartridge of the electrophotographic image forming apparatus includes a developing roller that develops an electrostatic latent image formed on an outer circumferential surface of a photosensitive drum, a toner supplying roller that supplies toner onto the developing roller, a seal bracket that is installed above and apart from the toner supplying roller, an outer seal film including an end adhered to the seal bracket and the other end contacting an outer circumference of the developing roller, and an inner seal film that is adhered to an inner surface of the seal bracket so that an end of the inner seal film contacts an outer circumference of the supplying roller.

Abstract: An image developing apparatus includes an upper case; a lower case disposed on a lower side of the upper case, and internally housing a developing agent, and having an opening. A photoconductive drum is disposed on the upper case for forming an electrostatic latent image on a surface thereof. A charging roller is disposed on one side of an outer circumference of the photoconductive drum for charging the photoconductive drum. A developing roller having one part is exposed through the opening of the lower case to cooperate with the photoconductive drum for developing the electrostatic latent image. A scattering preventing unit disposed between the photoconductive drum and the developing roller, to prevent scattering of the developing agent supplied by the developing roller. The scattering preventing unit includes a blocking curtain which covers a part of the opening and having one side in contact with the outer circumference of the photoconductive drum.

Abstract: A toner cartridge used with an electrophotographic image forming apparatus includes a developing roller to develop an electrostatic latent image formed on an outer circumferential surface of a photosensitive drum, a toner to supply roller supplying toner onto the developing roller, a guide member installed under the toner supplying roller to guide the toner to attach onto the surface of the toner supplying roller by a predetermined thickness, a hopper to store the toner supplied to the toner supplying roller, and an agitator rotatably installed on the hopper. A rotary shaft of the agitator is disposed in a position higher than an upper portion of the guide member.

Abstract: A toner cartridge used with an electrophotographic image forming apparatus includes a developing roller that develops an electrostatic latent image formed on an outer circumferential surface of a photosensitive drum, a toner supplying roller that supplies toner onto the developing roller, a main chamber that stores the toner, a guide member that is disposed under the toner supplying roller to receive the toner and to guide the toner toward the developing roller, a toner recovery chamber that is formed under the guide member to form a space where the toner remaining on the guide member, which is not supplied to the developing roller, can accumulate, a recovery roller that rotates in the toner recovery chamber to return the toner in the toner recovery chamber to the main chamber, and a toner blocking film that is installed on a lower portion of the guide member to prevent the toner from directly leaking to the toner recovery chamber.

Abstract: A toner cartridge horizontally installed in an electrophotographic printer having a photoreceptor drum where an electrostatic latent image is formed by charging and exposure, and contributing to toner supply and development by being fixedly coupled to in the electrophotographic printer. The toner cartridge includes a housing filled with toner of a predetermined color, a development roller rotatably installed on the housing to face the photoreceptor drum and to supply the toner to the photoreceptor drum to develop an image by a difference in electrical potential, a supply roller rotatably installed in the housing in contact with the development roller and to control the toner to adhere to the development roller, and a guide member coupled to the housing to be disposed under the supply roller and to guide supply of the toner. When a diameter of the development roller is D2, the diameter D2 satisfies an inequality that 10.4?D2?22.1 [mm].

Abstract: A toner cartridge used with an electrophotographic image forming apparatus includes a developing roller to develop an electrostatic latent image formed on an outer circumferential surface of a photosensitive drum, a toner to supply roller supplying toner onto the developing roller, a guide member installed under the toner supplying roller to guide the toner to attach onto the surface of the toner supplying roller by a predetermined thickness, a hopper to store the toner supplied to the toner supplying roller, and an agitator rotatably installed on the hopper. A rotary shaft of the agitator is disposed in a position higher than an upper portion of the guide member.

Abstract: A toner cartridge of an electrophotographic image forming apparatus. The toner cartridge of the electrophotographic image forming apparatus includes a developing roller that develops an electrostatic latent image formed on an outer circumferential surface of a photosensitive drum, a toner supplying roller that supplies toner onto the developing roller, a seal bracket that is installed above and apart from the toner supplying roller, an outer seal film including an end adhered to the seal bracket and the other end contacting an outer circumference of the developing roller, and an inner seal film that is adhered to an inner surface of the seal bracket so that an end of the inner seal film contacts an outer circumference of the supplying roller.

Abstract: A toner cartridge used with an electrophotographic image forming apparatus includes a developing roller that develops an electrostatic latent image formed on an outer circumferential surface of a photosensitive drum, a toner supplying roller that supplies toner onto the developing roller, a main chamber that stores the toner, a guide member that is disposed under the toner supplying roller to receive the toner and to guide the toner toward the developing roller, a toner recovery chamber that is formed under the guide member to form a space where the toner remaining on the guide member, which is not supplied to the developing roller, can accumulate, a recovery roller that rotates in the toner recovery chamber to return the toner in the toner recovery chamber to the main chamber, and a toner blocking film that is installed on a lower portion of the guide member to prevent the toner from directly leaking to the toner recovery chamber.