Abstract: A developing cartridge and an image forming apparatus having a photoreceptor drum are provided. The photoreceptor drum includes a pair of sleeves having outer diameter units inserted into the ends of a cylindrical drum on which a photoconductive material layer is formed, inner diameter units to which shafts are rotatably coupled, and at least two protrusion units separated from each other in a length direction of the shafts and contacting the shafts by protruding from the inner diameter units. Accordingly, the location tolerance and the assembly tolerance of the photoreceptor drum can be reduced by only modifying the shape of the sleeves, without adding additional parts. As a result, printing defects such as voids and unevenness can be advantageously prevented, since the developing nip and developing gap are formed very uniformly.

Abstract: A developing cartridge usable with an image forming apparatus, the developing cartridge includes a supporting frame, a developing member which is supported in the supporting frame, and to supply the developer to an electrostatic latent image of a photosensitive body of the image forming apparatus, a supplying member which is supported in the supporting frame, and to supply the developer to the developing member, and an elastic unit which is supported in the supporting frame, and to elastically support the supplying member so that the supplying member can move toward and away from the developing member.

Abstract: In a structure for removably installing a developing unit inside a case of an electrophotographic image forming apparatus and in an electrophotographic image forming apparatus employing the same, a guide rail is formed at an inner side of the case of the electrophotographic image forming apparatus and it slopes upward and inward. A guide protrusion is formed on an enclosing housing of the developing unit to slide along the guide rail to guide an installation of the developing unit into the case, and a handle is extended from the housing in a direction opposite to the guide rail with an upward slope.

Abstract: A developing apparatus and develops a developer with respect to a photosensitive medium, the and includes a developing cartridge which accommodates the developer therein; a cleaning blade which contacts the photosensitive medium by an end part thereof to clean the photosensitive medium, a guide member which guides the cleaning blade to linearly reciprocate, and an elastic member which elastically biases the cleaning blade toward the photosensitive medium.

Abstract: An image forming apparatus of a contact-type to develop an electrostatic latent image using a single-component nonmagnetic toner includes a photoconductive medium, a developing roller to move and attach toner to the photoconductive medium to develop the electrostatic latent image, a developing unit to support the developing roller to be rotatable, and having a toner receptacle to store the toner, a toner supplying roller to rotate in contact with the developing roller with a predetermined nip with the developing roller to supply the toner in the toner receptacle of the developing unit to the developing roller, and a cleaning unit to remove from the toner supplying roller the toner which remains on the toner supplying roller after the toner is transferred from the toner supplying roller to the developing roller.

Abstract: A cleaning apparatus and an image forming apparatus including the same. The cleaning apparatus includes: a developing unit to supply toner to an electrostatic latent image formed on a photosensitive body, a cleaning blade installed above the photosensitive body and the developing unit to contact a circumference of the photosensitive body along a lengthwise direction thereof with a predetermined force, to remove waste toner remaining on the photosensitive body, and having a surface along which the removed waste toner is transported, and a waste toner reservoir unit to store the waste toner transported along the surface after being removed by the cleaning blade, wherein the surface slopes upward at a predetermined angle with respect to a horizontal plane. The cleaning apparatus efficiently utilizes space in the image forming apparatus and can protect the photosensitive body and the developing unit from being deformed by external impact.

Abstract: An image forming apparatus, including a main body frame, a cover which is pivotally coupled to the main body frame, to occupy and move between a first position at which the cover is closed and a second position at which the cover is open, and a development cartridge, which is detachably mounted to an inner portion of the main body frame, and a handle connected to the cover so as to move the development cartridge in the outside direction of the main body frame when the cover is moved from the first position to the second position.

Abstract: An image forming apparatus comprises a photoconductive unit having a waste toner outlet and a shutter for closing the waste toner outlet, a developing unit removably mounted to the photoconductive unit and having a waste toner storage for storing a waste toner discharged through the waste toner outlet, a main body for receiving and supporting the photoconductive unit and the developing unit and having a door, and an opening/closing member moving in association with an opening and closing movement of the door, thereby moving the shutter to a position for opening the waste toner outlet, wherein the shutter moves to the position for opening the waste toner outlet by mounting both the photoconductive unit and the developing unit and closing the door at the same time.

Abstract: A process cartridge and an image forming apparatus including the same, the process cartridge comprising a side plate; a developing roller rotatably supported at the side plate; a photoconductive body having a center axle rotatably supported at the side plate so as to be located adjacent to the developing roller; and a center shifting member for moving the center axle of the photoconductive body from a first position to a second position so as to separate a developing nip between the photoconductive body and the developing roller. The image forming apparatus includes the process cartridge, so that it can establish and maintain the developing nip between the photoconductive body and the developing roller to print an image or separate the developing nip to circulate the process cartridge in the market.

Abstract: A printer cartridge including a cartridge casing to accommodate a plurality of rotating units rotating in parallel with each other, the cartridge casing being formed with a support opening on at least one side thereof in the axial direction of the rotating units, and a side plate, at least a part of which is welded to the cartridge casing, to cover the support opening, the side plate including support parts to support axial ends of the rotating units. Since the side plate is not easily disconnected from the cartridge casing, damage of rotating bodies accommodated within the cartridge casing, leakage of the toner, and insertion of foreign matters may be prevented.

Abstract: In a structure for removably installing a developing unit inside a case of an electrophotographic image forming apparatus and in an electrophotographic image forming apparatus employing the same, a guide rail is formed at an inner side of the case of the electrophotographic image forming apparatus and it slopes upward and inward. A guide protrusion is formed on an enclosing housing of the developing unit to slide along the guide rail to guide an installation of the developing unit into the case, and a handle is extended from the housing in a direction opposite to the guide rail with an upward slope.

Abstract: A developing cartridge and an image forming apparatus having a photoreceptor drum are provided. The photoreceptor drum includes a pair of sleeves having outer diameter units inserted into the ends of a cylindrical drum on which a photoconductive material layer is formed, inner diameter units to which shafts are rotatably coupled, and at least two protrusion units separated from each other in a length direction of the shafts and contacting the shafts by protruding from the inner diameter units. Accordingly, the location tolerance and the assembly tolerance of the photoreceptor drum can be reduced by only modifying the shape of the sleeves, without adding additional parts. As a result, printing defects such as voids and unevenness can be advantageously prevented, since the developing nip and developing gap are formed very uniformly.

Abstract: An image forming apparatus, including a main body frame, a cover which is pivotally coupled to the main body frame, to occupy and move between a first position at which the cover is closed and a second position at which the cover is open, and a development cartridge, which is detachably mounted to an inner portion of the main body frame, and a handle connected to the cover so as to move the development cartridge in the outside direction of the main body frame when the cover is moved from the first position to the second position.

Abstract: An image forming apparatus comprises a photoconductive unit having a waste toner outlet and a shutter for closing the waste toner outlet, a developing unit removably mounted to the photoconductive unit and having a waste toner storage for storing a waste toner discharged through the waste toner outlet, a main body for receiving and supporting the photoconductive unit and the developing unit and having a door, and an opening/closing member moving in association with an opening and closing movement of the door, thereby moving the shutter to a position for opening the waste toner outlet, wherein the shutter moves to the position for opening the waste toner outlet by mounting both the photoconductive unit and the developing unit and closing the door at the same time.

Abstract: A cleaning apparatus and an image forming apparatus including the same. The cleaning apparatus includes: a developing unit to supply toner to an electrostatic latent image formed on a photosensitive body, a cleaning blade installed above the photosensitive body and the developing unit to contact a circumference of the photosensitive body along a lengthwise direction thereof with a predetermined force, to remove waste toner remaining on the photosensitive body, and having a surface along which the removed waste toner is transported, and a waste toner reservoir unit to store the waste toner transported along the surface after being removed by the cleaning blade, wherein the surface slopes upward at a predetermined angle with respect to a horizontal plane. The cleaning apparatus efficiently utilizes space in the image forming apparatus and can protect the photosensitive body and the developing unit from being deformed by external impact.

Abstract: A storage member to receive used toner in a printer may be installed in and removed from the printer with the inlet to the storage member closed. The storage member includes a housing that stores the used toner retrieved from the printer. An inlet forms a path through which the used toner is induced at an upper portion of the housing. A shutter slides to open and close the inlet. A shutter opening and closing rib moves the shutter linearly to open and close the inlet. An elastic member connects the shutter and the upper portion of the housing, and is elastically biased to maintain the shutter in a closed position.

Abstract: An image forming apparatus of a contact-type to develop an electrostatic latent image using a single-component nonmagnetic toner includes a photoconductive medium, a developing roller to move and attach toner to the photoconductive medium to develop the electrostatic latent image, a developing unit to support the developing roller to be rotatable, and having a toner receptacle to store the toner, a toner supplying roller to rotate in contact with the developing roller with a predetermined nip with the developing roller to supply the toner in the toner receptacle of the developing unit to the developing roller, and a cleaning unit to remove from the toner supplying roller the toner which remains on the toner supplying roller after the toner is transferred from the toner supplying roller to the developing roller.