Abstract: Disclosed is an image forming apparatus. The image forming apparatus includes a housing having a discharge port, a plurality of photosensitive bodies mounted in the housing, a transfer unit to transfer visible images formed on the plurality of photosensitive bodies onto a printing medium, a fusing unit to fuse transferred visible images to the printing medium, and a reverse unit to reverse a moving direction of the printing medium, after the printing medium has passed through the fusing unit. As the moving direction of the printed printing medium is reversed by the reverse unit, the printing medium may be discharged while a printed surface of the printing medium is directed downward, allowing a user to easily draw out the printing medium.

Abstract: Disclosed is an image forming apparatus. The image forming apparatus includes a housing having a discharge port, a plurality of photosensitive bodies mounted in the housing, a transfer unit to transfer visible images formed on the plurality of photosensitive bodies onto a printing medium, a fusing unit to fuse transferred visible images to the printing medium, and a reverse unit to reverse a moving direction of the printing medium, after the printing medium has passed through the fusing unit. As the moving direction of the printed printing medium is reversed by the reverse unit, the printing medium may be discharged while a printed surface of the printing medium is directed downward, allowing a user to easily draw out the printing medium.

Abstract: Disclosed is an image forming apparatus. The image forming apparatus includes a housing having a discharge port, a plurality of photosensitive bodies mounted in the housing, a transfer unit to transfer visible images formed on the plurality of photosensitive bodies onto a printing medium, a fusing unit to fuse transferred visible images to the printing medium, and a reverse unit to reverse a moving direction of the printing medium, after the printing medium has passed through the fusing unit. As the moving direction of the printed printing medium is reversed by the reverse unit, the printing medium may be discharged while a printed surface of the printing medium is directed downward, allowing a user to easily draw out the printing medium.

Abstract: A method and apparatus for controlling registration sensors are provided, in which a transfer unit transfers an electrostatic latent image onto a printing medium, at least one registration sensor senses image alignment errors by irradiating light to the transfer unit to sense reflected light, a sensor data storage unit stores characteristics data of the respective registration sensors, and a sensor control unit controls the registration sensors based on the characteristics data of the respective registration sensors, wherein the registration sensors are placed into the transfer unit. Accordingly, time for performing an algorithm of color registration can be reduced, and registration can be achieved correctly in a short time, irrespective of a set frame of the image forming apparatus.

Abstract: Disclosed is an image forming apparatus. The image forming apparatus includes a housing having a discharge port, a plurality of photosensitive bodies mounted in the housing, a transfer unit to transfer visible images formed on the plurality of photosensitive bodies onto a printing medium, a fusing unit to fuse transferred visible images to the printing medium, and a reverse unit to reverse a moving direction of the printing medium, after the printing medium has passed through the fusing unit. As the moving direction of the printed printing medium is reversed by the reverse unit, the printing medium may be discharged while a printed surface of the printing medium is directed downward, allowing a user to easily draw out the printing medium.

Abstract: A method and apparatus for controlling registration sensors are provided, in which a transfer unit transfers an electrostatic latent image onto a printing medium, at least one registration sensor senses image alignment errors by irradiating light to the transfer unit to sense reflected light, a sensor data storage unit stores characteristics data of the respective registration sensors, and a sensor control unit controls the registration sensors based on the characteristics data of the respective registration sensors, wherein the registration sensors are placed into the transfer unit. Accordingly, time for performing an algorithm of color registration can be reduced, and registration can be achieved correctly in a short time, irrespective of a set frame of the image forming apparatus.

Abstract: Disclosed is an image forming apparatus. The image forming apparatus includes a housing having a discharge port, a plurality of photosensitive bodies mounted in the housing, a transfer unit to transfer visible images formed on the plurality of photosensitive bodies onto a printing medium, a fusing unit to fuse transferred visible images to the printing medium, and a reverse unit to reverse a moving direction of the printing medium, after the printing medium has passed through the fusing unit. As the moving direction of the printed printing medium is reversed by the reverse unit, the printing medium may be discharged while a printed surface of the printing medium is directed downward, allowing a user to easily draw out the printing medium.

Abstract: Disclosed is an image forming apparatus. The image forming apparatus includes a housing having a discharge port, a plurality of photosensitive bodies mounted in the housing, a transfer unit to transfer visible images formed on the plurality of photosensitive bodies onto a printing medium, a fusing unit to fuse transferred visible images to the printing medium, and a reverse unit to reverse a moving direction of the printing medium, after the printing medium has passed through the fusing unit. As the moving direction of the printed printing medium is reversed by the reverse unit, the printing medium may be discharged while a printed surface of the printing medium is directed downward, allowing a user to easily draw out the printing medium.

Abstract: A method and apparatus for controlling registration sensors are provided, in which a transfer unit transfers an electrostatic latent image onto a printing medium, at least one registration sensor senses image alignment errors by irradiating light to the transfer unit to sense reflected light, a sensor data storage unit stores characteristics data of the respective registration sensors, and a sensor control unit controls the registration sensors based on the characteristics data of the respective registration sensors, wherein the registration sensors are placed into the transfer unit. Accordingly, time for performing an algorithm of color registration can be reduced, and registration can be achieved correctly in a short time, irrespective of a set frame of the image forming apparatus.

Abstract: A method and apparatus for controlling registration sensors are provided, in which a transfer unit transfers an electrostatic latent image onto a printing medium, at least one registration sensor senses image alignment errors by irradiating light to the transfer unit to sense reflected light, a sensor data storage unit stores characteristics data of the respective registration sensors, and a sensor control unit controls the registration sensors based on the characteristics data of the respective registration sensors, wherein the registration sensors are placed into the transfer unit. Accordingly, time for performing an algorithm of color registration can be reduced, and registration can be achieved correctly in a short time, irrespective of a set frame of the image forming apparatus.

Abstract: An image forming apparatus includes a housing, a photosensitive body mounted in the housing to form a visible image, a transfer unit mounted to an inner front portion of the housing to transfer the visible image of the photosensitive body onto a printing medium, a fusing unit mounted in a downstream side from the transfer unit in a printing medium feeding path to fuse the visible image to the printing medium, and a reverse unit mounted in a downstream side from the fusing unit in the printing medium feeding path to reverse the printing medium having passed through the fusing unit. Accordingly, a moving direction of the printed printing medium is reversed by the reverse unit so that the printing medium can be discharged while a printed surface of the printing medium is directed downward, thereby easily drawing out the printing medium without additionally arranging the printed pages in a correct order.

Abstract: Provided is a color registration compensation apparatus and method for an electro-photographic image forming apparatus. The color registration compensation apparatus for an electro-photographic image forming apparatus including an exposing unit for forming a plurality of latent images of patterns onto photoconductive drums, wherein at least two of the latent images are comprised of different colors; a developing unit for developing the latent images of the patterns; a pattern sensing unit for sensing the patterns transferred onto a transfer belt after the development; and a color registration control unit for calculating position information data each time the patterns are sensed, for calculating a deviation between the position information data and a set value, for calculating a color registration compensation value using the position information data when the deviation is equal to or less than a threshold value, and for then controlling exposure start timings.

Abstract: A method and apparatus for controlling registration sensors are provided, in which a transfer unit transfers an electrostatic latent image onto a printing medium, at least one registration sensor senses image alignment errors by irradiating light to the transfer unit to sense reflected light, a sensor data storage unit stores characteristics data of the respective registration sensors, and a sensor control unit controls the registration sensors based on the characteristics data of the respective registration sensors, wherein the registration sensors are placed into the transfer unit. Accordingly, time for performing an algorithm of color registration can be reduced, and registration can be achieved correctly in a short time, irrespective of a set frame of the image forming apparatus.

Abstract: An apparatus for controlling a toner density accurately in response to printing data include a toner sensor, a memory, a data input unit, a toner supply amount controlling unit, and a CPU. The toner sensor detects the toner density and generates a toner density detection value. The memory stores a toner density set-up value and an operational constant data table having an operational constant corresponding to the printing data. The toner supply amount controlling unit supplies the toner in response to a control signal generated from the CPU. The CPU determines the operational constant by using the operational constant data table, and controls the toner supply amount controlling unit by using the control signal generated from the operational constant, the toner density detection value, and the toner density set-up value.

Abstract: An apparatus for and a method of controlling a toner density accurately in response to printing data include a toner sensor, a memory, a data input unit, a toner supply amount controlling unit, and a CPU. The toner sensor detects the toner density and generates a toner density detection value. The memory stores a toner density set-up value and an operational constant data table having an operational constant corresponding to the printing data. The toner supply amount controlling unit supplies the toner in response to a control signal generated from the CPU. The CPU determines the operational constant by using the operational constant data table, and controls the toner supply amount controlling unit by using the control signal generated from the operational constant, the toner density detection value, and the toner density set-up value. The toner density controlling method controls the toner supply amount by setting up the operational constant in response to an amount of dots representing the printing data.

Abstract: There is disclosed an image forming apparatus using electrophotography including an interface unit allowing the image forming apparatus to be in continual electrical communication with an external data input system; a photodetector for sensing the level of brightness in a room in which the apparatus is located, and generating a signal corresponding thereto; a printing unit having driving mechanisms for paper conveyance and printing, and carrying out a power conservation mode and printing operations; and a controller for controlling the overall operations of the image forming apparatus, electrically communicating with the external data input system by way of the interface unit, and establishing a power conservation mode in which power consumption is lower than that of a standby mode, on receiving a signal reporting that the level of brightness in the room is lower than a standard brightness preset in the system, from the photodetector.

Abstract: A technique for controlling a developing voltage of an image forming device, which is capable of properly controlling the developing voltage according to thickness of the printing paper includes: setting a specific printing paper flag according to a key input generated by selection of specific printing paper by a user; checking whether or not the specific printing paper flag is set; and, upon determining that the specific printing paper flag has been set, controlling the developing voltage so as to be a developing voltage value corresponding to the proper amount of toner during forming an image on the specific printing paper.

Abstract: A method of controlling a charge voltage of an image forming apparatus using an electrophotographic developing process so as to enhance cleaning efficiency by increasing the number of collecting positively-charged toner adhering to contact charging unit. The method includes: applying a charge voltage of a predetermined voltage level to a contact charging unit to uniformly charge an outer surface of a photoconductive body to a predetermined polarity while a main motor rotates; when cleaning the contact charging unit, applying a charge voltage exhibiting a voltage level lower than the predetermined voltage level to the contact charging unit to create a potential difference between the contact charging unit the photoconductive body; and transferring charged toner particles adhered to the contact charging unit, to the photoconductive body by shutting off the charge voltage being applied to the contact charging unit.

Abstract: A transfer voltage adjusting apparatus senses the thickness of printing papers used as recording medium and the printing environment and outputs transfer voltage according to the sensed thickness and the printing environment, thereby achieving an optimum image density.

Abstract: A charging device of an electrophotography printing apparatus may improved the charging efficiency by preventing the potential difference generated at both ends of a photosensitive drum. An auxiliary charging device includes an auxiliary charging plate to which voltage is applied. The plate is installed to come into contact with both ends of the photosensitive drum in order to compensate for a potential level in a developing cartridge. The electrophotography printing apparatus may include a charging unit, a developing unit and a toner supplying unit provided around the photosensitive drum.