Abstract: A method, apparatus, and image forming system to process additional information in a printing task. The method includes receiving a printing task which includes data to be printed, determining whether the received printing task includes additional information, and, if the printing task includes additional information, printing out the data to be printed and the additional information after changing color of the data to be printed or the additional information according to a printing mode. Thus, unnecessary driving of a driving unit of a color image forming device due to additional information added to a printing task can be prevented.

Abstract: An image forming device having a plurality of developing units is provided. The image forming device includes a control unit to determine whether to perform an auto color registration (ACR) with respect to one or more of the plurality of developing units, and a print engine unit to perform an ACR of the determined developing units.

Abstract: An image forming apparatus including: a user interface unit to display a user interface to select one or more low noise modes to reduce noise produced during a print standby state and a printing state of the image forming apparatus; and a controller to control the driving of a laser scanning unit and to control a print speed, according to one or more of the selected low noise modes selected through the user interface. Therefore, noise generated in the print standby state, and/or the printing state, are reduced, according to a low noise mode selected by a user.

Abstract: The post-processing device which performs a post-processing operation for a discharged printing medium with an image formed thereon, includes: an image forming unit which forms an image on the printing medium; a medium feeding unit which feeds the printing medium to the image forming unit; a discharging unit which is provided in the post-processing device and discharges the printing medium with the image formed thereon; a medium alignment unit which aligns the printing medium for post-processing for the discharged printing medium; a user interface unit which receives an instruction form a user; and a control unit which controls a width of the medium alignment unit to correspond to a width of the discharged printing medium based on a setting value for the medium feeding unit, which is input through the user interface unit, when the size of the printing medium loaded on the medium feeding unit is not detected.

Abstract: An image forming apparatus to print at least one of a plurality of test images and texts at various print concentration levels such that confusion of a user due to a change of a print concentration level is prevented, and a method of controlling the same. The method of controlling an image forming apparatus includes receiving confirmation of a print concentration level to print an image and printing at least one of test images and texts having predetermined print concentrations according to a normal print mode and a toner conservation mode, according to the received confirmation of the print concentration level.

Abstract: A method, apparatus, and image forming system to process additional information in a printing task. The method includes receiving a printing task which includes data to be printed, determining whether the received printing task includes additional information, and, if the printing task includes additional information, printing out the data to be printed and the additional information after changing color of the data to be printed or the additional information according to a printing mode. Thus, unnecessary driving of a driving unit of a color image forming device due to additional information added to a printing task can be prevented.

Abstract: An image forming apparatus including: a user interface unit to display a user interface to select one or more low noise modes to reduce noise produced during a print standby state and a printing state of the image forming apparatus; and a controller to control the driving of a laser scanning unit and to control a print speed, according to one or more of the selected low noise modes selected through the user interface. Therefore, noise generated in the print standby state, and/or the printing state, are reduced, according to a low noise mode selected by a user.

Abstract: A printing device that includes: a printing unit that performs double-sided printing on special paper; and a control unit that controls the printing unit to print one side of the special paper at a first printing rate, and to print the other side of the special paper at a different second printing rate. Accordingly, an overall printing rate is faster than a conventional printing device, a fixing quality is maintained, and printing performance is improved. The printing device can include a interface unit or a UI unit, to set the first and second printing rates.

Abstract: An image forming device having a plurality of developing units is provided. The image forming device includes a control unit to determine whether to perform an auto color registration (ACR) with respect to one or more of the plurality of developing units, and a print engine unit to perform an ACR of the determined developing units.

Abstract: An image forming apparatus to print at least one of a plurality of test images and texts at various print concentration levels such that confusion of a user due to a change of a print concentration level is prevented, and a method of controlling the same. The method of controlling an image forming apparatus includes receiving confirmation of a print concentration level to print an image and printing at least one of test images and texts having predetermined print concentrations according to a normal print mode and a toner conservation mode, according to the received confirmation of the print concentration level.

Abstract: An image forming apparatus includes an image forming part that forms an image on a recording medium and includes a plurality of photoconductors, a plurality of charging parts that charges the photoconductors, a plurality of developing parts that develops the charged photoconductors, and a plurality of static electricity erasing parts that erases surface potentials of the charged photoconductors. A power supplying part supplies power to the image forming part, and a controller controls to switch the operation of the static electricity erasing parts independently and controls the image forming part to form the image on the recording medium if power applied to the respective photoconductors through the charging parts and the developing parts reaches a target value.

Abstract: A gas purifying apparatus oxidatively decomposes and discharges impurities such as flammable hydrocarbons (CmH2n) contained in gas generated from a toner by fixing an image. An image forming apparatus having a gas purifying apparatus, and a method of purifying gas of the image forming apparatus are also provided. The gas purifying apparatus comprises a fan unit for ventilating air, a heating unit for heating the air ventilated by the fan unit, a catalytic unit for facilitating oxidative decomposition of impurities contained in the air, and an ozone generation unit located upstream of the heating unit and the catalytic unit in the air flow direction. By providing the ozone generation unit for facilitating the oxidative decomposition reaction by the catalytic unit for impurities contained in gas generated by fixing an image, the gas purifying rate can be improved and by minimizing the reaction area of catalyst oxidizing impurities, and reducing the manufacturing costs.

Abstract: An oxidation catalyst unit for judging a life span of an oxidation catalyst and a wet-type electrophotographic image forming apparatus having the oxidation catalyst unit, and a method of judging the life span of the oxidation catalyst. The oxidation catalyst unit includes a duct unit, a fan motor, a heater, an oxidation catalyst filter, and a temperature sensing unit. The temperature sensing unit senses upper and lower atmospheric temperatures of the oxidation catalyst filter. A controller of the wet-type electrophotographic image forming apparatus having the oxidation catalyst unit then compares data on the upper and lower atmosphere temperatures sensed by the temperature sensing unit with input reference data to judge the life span of the oxidation catalyst.

Abstract: A detector for detecting an abnormality in the developer passage includes a sensing unit for detecting a rotational speed of the developer pump, a rotational speed storage for storing rotational speed reference of the developer pump, and a controller for controlling the driving of the developer pump and detecting the abnormality in the developer passage on the basis of a comparison between a rotational speed calculation of the developer pump according to a detection signal from the sensing unit and a rotational speed reference of the developer pump stored in the rotational speed storage. The detector can be advantageously used for detecting a leak and/or a clogging in the developer passage caused by a manufacture/assembly defect, or sediment of the developer sludge, and can inform the user about the abnormal state of the developer passage.

Abstract: An oxidation catalyst device for a wet-type electrophotographic image forming apparatus and method of controlling the same are provided. The oxidation catalyst device includes a duct for guiding air inside a fixation device to the outside of the fixation device. The oxidation catalyst device further includes a fan for forcibly discharging the air inside of the fixation device, a heater for heating the air discharged from the fixation device, and an oxidation catalyst device-carrying body for facilitating oxidation resolution reaction of the carrier vapors entrained in the discharged air. The fan is driven at a first rotational speed of N1, during which the oxidation catalyst carrying body is warmed up, and a second rotational speed of N2, during which carrier vapors are heated and resolved.

Abstract: A wet type electrophotographic image forming apparatus includes a photosensitive medium, a light exposure device, a developing device, a transfer device, a fuser device, an oxidation catalyst device, a temperature sensor, a power supply device and a control device. The oxidation catalyst device includes an oxidation catalyst carrying body and a heater, and removes vapor of developer solution from the fuser device by utilizing oxidation decomposition. The control device receives data about the temperature detected from the temperature sensor, and variably controls the temperature of the oxidation catalyst device in accordance operational modes such as warm-up mode, standby mode and print mode. Considering the fact that the oxidation catalyst device has higher efficiency at optimum activation temperature, appropriate temperature control can guarantee increased oxidation efficiency of the oxidation catalyst device.

Abstract: A gas purifying apparatus oxidatively decomposes and discharges impurities such as flammable hydrocarbons (CmH2n) contained in gas generated from a toner by fixing an image. An image forming apparatus having a gas purifying apparatus, and a method of purifying gas of the image forming apparatus are also provided. The gas purifying apparatus comprises a fan unit for ventilating air, a heating unit for heating the air ventilated by the fan unit, a catalytic unit for facilitating oxidative decomposition of impurities contained in the air, and an ozone generation unit located upstream of the heating unit and the catalytic unit in the air flow direction. By providing the ozone generation unit for facilitating the oxidative decomposition reaction by the catalytic unit for impurities contained in gas generated by fixing an image, the gas purifying rate can be improved and by minimizing the reaction area of catalyst oxidizing impurities, and reducing the manufacturing costs.

Abstract: A detector for detecting an abnormality in the developer passage includes a sensing unit for detecting a rotational speed of the developer pump, a rotational speed storage for storing rotational speed reference of the developer pump, and a controller for controlling the driving of the developer pump and detecting the abnormality in the developer passage on the basis of a comparison between a rotational speed calculation of the developer pump according to a detection signal from the sensing unit and a rotational speed reference of the developer pump stored in the rotational speed storage. The detector can be advantageously used for detecting a leak and/or a clogging in the developer passage caused by a manufacture/assembly defect, or sediment of the developer sludge, and can inform the user about the abnormal state of the developer passage.

Abstract: An oxidation catalyst unit for judging a life span of an oxidation catalyst and a wet-type electrophotographic image forming apparatus having the oxidation catalyst unit, and a method of judging the life span of the oxidation catalyst. The oxidation catalyst unit comprises a duct unit, a pan motor, a heater, an oxidation catalyst filter, and a temperature sensing unit. The temperature sensing unit senses upper and lower atmospheric temperatures of the oxidation catalyst filter. A controller of the wet-type electrophotographic image forming apparatus having the oxidation catalyst unit then compares data on the upper and lower atmosphere temperatures sensed by the temperature sensing unit with input reference data to judge the life span of the oxidation catalyst.

Abstract: A wet type electrophotographic image forming apparatus comprises a photosensitive medium, a light exposure device, a developing device, a transfer device, a fuser device, an oxidation catalyst device, a temperature sensor, a power supply device and a control device. The oxidation catalyst device comprises an oxidation catalyst carrying body and a heater, and removes vapor of developer solution from the fuser device by utilizing oxidation decomposition. The control device receives data about the temperature detected from the temperature sensor, and variably controls the temperature of the oxidation catalyst device in accordance operational modes such as warm-up mode, standby mode and print mode. Considering the fact that the oxidation catalyst device has higher efficiency at optimum activation temperature, appropriate temperature control can guarantee increased oxidation efficiency of the oxidation catalyst device.