Abstract: An image forming apparatus capable of easily achieving installation of developing units on a developing tray is disclosed. The disclosed image forming apparatus includes a tray section, a plurality of developing units each provided with guide protrusions, and a developing tray including a plurality of supports to support the guide protrusions of the developing units, and a plurality of guides each adapted to guide a corresponding one of the guide protrusions to a corresponding one of the supports. The guides have widths gradually increasing in a direction from a first end of the tray section to a second end of the tray section, respectively.

Abstract: An image forming apparatus, a method, and a computer-readable recording medium are provided. The image forming apparatus includes an input unit which receives image data, a detection unit which detects a printing concentration of the received image data, an image processing unit which composes a copy protection pattern and the image data so that the copy protection pattern is printed with a concentration corresponding to the detected printing concentration, and an image forming unit which prints image data composed with the copy protection pattern.

Abstract: An image forming apparatus includes a guide member to guide movement of a developing device receiving member, which receives a plurality of developing devices, between the exterior and the interior of an image forming apparatus body. The guide member supports the developing device receiving member to enable rotation of the developing device receiving member within the body.

Abstract: An image forming apparatus includes a guide member to guide movement of a developing device receiving member, which receives a plurality of developing devices, between the exterior and the interior of an image forming apparatus body. The guide member supports the developing device receiving member to enable rotation of the developing device receiving member within the body.

Abstract: An apparatus and method for printing according to the type of print media when a printer having a wide printhead is used for printing is disclosed. The method comprises picking up the print medium and feeding the medium toward under the wide printhead; determining a type of the fed medium; and printing the medium in a predetermined resolution and in a predetermined ink dropping speed according to the type of the medium. Therefore, an optimal printing quality corresponding to the type of used paper can be obtained even when a user does not set the resolution.

Abstract: An image forming apparatus and method thereof. The image forming apparatus includes a print head having the same size as an image to be printed, a plurality of heating elements that form the image and are arranged in the form of a matrix on the print head, and a plurality of driving elements that correspond to the plurality of heating elements, respectively.

Abstract: A method and apparatus for correcting deviation of a temperature sensor placed in a header having a plurality of nozzles in an inkjet printer is provided. The deviation correcting method includes spraying ink through the nozzles a predetermined number of times, measuring a temperature of the temperature sensor corresponding to the number of sprayed times, measuring a voltage output from the temperature sensor, and determining a correction value of the temperature sensor using the measured temperature and the output voltage. According to the method and apparatus, it is possible to correct a large amount of deviation of a thermistor in a header without using an additional element, that is, an ambient sensor. Therefore, since an expensive ambient sensor is not used, costs can be reduced and a printer circuit configuration is simplified.

Abstract: An image forming apparatus and method are provided to decode compressed moving image data and selectively display a moving image corresponding to the decoded moving image data. The image forming apparatus includes a decoding unit which decodes compressed moving image data and a moving image reproduction unit which reproduces the decoded moving image data. The image forming apparatus also includes an image processing unit which chooses one or more predetermined frames from the decoded moving image data in response to predetermined manipulation results and processes the chosen frames, and an image forming unit which forms one or more images based on the processed frames.

Abstract: A color printing method and apparatus include a printer printing a color image on a recording paper using color inks contained in a color cartridge includes detecting a residual amount of each of the color inks. The residual amount of each of the color inks is compared with a predetermined standard residual amount. The color image is printed using the at least one of the color inks having the residual amount greater than the predetermined standard residual amount.

Abstract: Provided are a method and apparatus for compensating for an energy difference in a thermal print head that prints an image by heating a medium. The method includes measuring a direct current voltage of an adapter that applies a voltage to a heating unit when power is supplied to an image forming apparatus, and adjusting heating time of the heating unit using the measured direct current voltage. Accordingly, it is possible to obtain an even distribution of the optical density of an image without an additional voltage adjustment unit or manually compensating for the energy difference.

Abstract: An apparatus and method feed paper in an image forming apparatus.

Abstract: An ejection controlling device for an inkjet printer and a controlling method thereof includes determining whether an ink cartridge is installed in the inkjet printer, printing patterns in order by driving an ink ejection heater with an array of predetermined pulses with widths that vary in sequential order in response to the ink cartridge being connected to the inkjet printer, detecting printing densities of the printed patterns; determining the pattern with an optimal density among the printing densities, and storing the width of the pulse corresponding to the pattern with the optimal density as an optimal pulse width.

Abstract: An apparatus and method for printing according to the type of print media when a printer having a wide printhead is used for printing is disclosed. The method comprises picking up the print medium and feeding the medium toward under the wide printhead; determining a type of the fed medium; and printing the medium in a predetermined resolution and in a predetermined ink dropping speed according to the type of the medium. Therefore, an optimal printing quality corresponding to the type of used paper can be obtained even when a user does not set the resolution.

Abstract: A method and apparatus for correcting deviation of a temperature sensor placed in a header having a plurality of nozzles in an inkjet printer is provided. The deviation correcting method includes spraying ink through the nozzles a predetermined number of times, measuring a temperature of the temperature sensor corresponding to the number of sprayed times, measuring a voltage output from the temperature sensor, and determining a correction value of the temperature sensor using the measured temperature and the output voltage. According to the method and apparatus, it is possible to correct a large amount of deviation of a thermistor in a header without using an additional element, that is, an ambient sensor. Therefore, since an expensive ambient sensor is not used, costs can be reduced and a printer circuit configuration is simplified.

Abstract: A method of determining missing nozzles in an inkjet printer involving: printing a rectangular test pattern on a printing paper by using each nozzle or each group of nozzles of a printhead, and scanning the rectangular test pattern printed on the printing paper by using an optical sensor, which is an automatic alignment sensor.

Abstract: A head maintenance control method of an inkjet printer includes receiving a printing command performing a printing operation, calculating a time difference between an input time of the printing command and a final time that the printing operation of the inkjet printer has been most recently performed before the printing command is input, displaying a message requesting the maintenance operation when the time difference is greater than a predetermined time, and performing the maintenance when an execution command for performing the maintenance is input. An intensity of the maintenance operation varies in accordance with the time difference. The maintenance operation is performed in response to an actually required degree when the maintenance should be performed, thus an unnecessary maintenance operation is avoided or an incomplete maintenance operation is prevented.

Abstract: An injection controlling device for an inkjet printer and a controlling method thereof includes determining whether an ink cartridge is installed in the inkjet printer, printing patterns in order by driving an ink injection heater with an array of predetermined pulses with widths that vary in sequential order in response to the ink cartridge being connected to the inkjet printer, detecting printing densities of the printed patterns; determining the pattern with an optimal density among the printing densities, and storing the width of the pulse corresponding to the pattern with the optimal density as an optimal pulse width.

Abstract: A color printing method and apparatus include a printer printing a color image on a recording paper using color inks contained in a color cartridge includes detecting a residual amount of each of the color inks. The residual amount of each of the color inks is compared with a predetermined standard residual amount. The color image is printed using the at least one of the color inks having the residual amount greater than the predetermined standard residual amount.

Abstract: An apparatus and method feed paper in an image forming apparatus.

Abstract: A method of and an apparatus for managing a nozzle of an ink-jet printer include determining whether an operation of printing a document is requested, counting slices of print data if it determined that the operation of printing the document is requested, determining whether a counting result of counting the slices is larger than a first predetermined value and performing the counting of the slices if it is determined that the counting result is not larger than the first predetermined value, managing the nozzle if it is determined that the counting result is larger than the first predetermined value, and determining whether an operation of printing the document is terminated, and performing the counting of the slices if it is determined that the operation of printing the document is not terminated. The nozzle can be effectively managed by considering an amount of ink that is actually ejected through the nozzle and a print time, thereby improving a printing quality of the printed document.