Patent application number | Description | Published |
20080285998 | IMAGE FORMING APPARATUS CAPABLE OF REDUCING TEMPERATURE DIFFERENCE OF A PHOTOSENSITIVE BODY - An image forming apparatus includes: a photosensitive body; a driver to drive the photosensitive body; a supporting bracket to support the driver; and a heat insulator disposed between the supporting bracket and the driver to shield the photosensitive body from heat generated by the driver. | 11-20-2008 |
20080304855 | Image forming apparatus with external air circulation chamber - An image forming apparatus capable of minimizing a temperature rise of a cover is disclosed. The image forming apparatus includes a main body, a fusing unit mounted in the main body to fuse an image to paper, a cover mounted to the main body to expose the fusing unit, a heat shielding member mounted proximate to an inner side of the cover to block heat transferred from the fusing unit, an external air circulation chamber formed between the heat shielding member and the cover, in which external air circulates by convection, and at least one external air flow hole, through which the air flows into/out of the external air circulation chamber. | 12-11-2008 |
20090022537 | PRINTING MEDIUM SUPPLYING UNIT AND IMAGE FORMING APPARATUS HAVING THE SAME - A printing medium supplying unit comprises a printing medium loading plate configured to move up and down based on an amount of printing medium loaded on the printing medium loading plate and an elevation control unit configured to adjust an elevation height of the printing medium loading plate such that a standby position of the printing medium loading plate can vary based on an amount of the printing medium loaded on the printing medium loading plate, wherein the standby position of the printing medium loading plate is a position in which the printing medium loading plate does not supply the printing medium to an image forming unit. | 01-22-2009 |
20100092217 | TRANSFERRING UNIT AND IMAGE FORMING APPARATUS INCLUDING THE SAME - Disclosed are a transfer unit and an image forming apparatus having the same. The apparatus can include multiple members configured to carry developer associated with color images. The transfer unit can include multiple rollers each disposed to opposingly face a respective corresponding one of the members, a belt interposed between the rollers and the members, and a device configured to support the rollers. The rollers can include a first roller at one end of the transfer unit, a second roller at an opposite end and one or more middle rollers arranged between the first and second rollers. The device can be configured such that a rotation center of the first roller and a rotation center of the second roller define a first plane and a rotation center of the one or more middle rollers defines a second plane parallel to but not co-planar with the first plane. | 04-15-2010 |
20100104321 | IMAGE FORMING APPARATUS AND VELOCITY CONTROL METHOD OF ROTATING BODY THEREOF - An image forming apparatus is configured to reduce a velocity fluctuation of a rotating body by reducing the AC velocity component of the rotating body. The image forming apparatus may include an image bearing body with a surface on which a toner image is formed; a driving motor configured to drive the image bearing body according to an input signal; and a controller configured to control the driving motor to output a motor output velocity at a period equal to that of an AC velocity component of the image bearing body. A velocity control method for the rotating body includes sampling a continuous motor input signal at a period equal to that of an AC velocity component of a rotating velocity of the rotating body. The sampled signal is transmitted to a driving motor that drives the rotating body, which is driven based upon the discrete motor input signal. | 04-29-2010 |
20100158569 | IMAGE FORMING APPARATUS AND METHOD FOR CONTROLLING THE SAME - An image forming apparatus and a method of controlling the same are disclosed. The image forming apparatus may include a plurality of photosensitive media, a driving unit configured to rotate the plurality of photosensitive media, a detecting unit configured to detect a rotational state of each of the plurality of photosensitive media and a controller configured to control the driving member based on the rotational state detected by the detecting unit so that two adjacent photosensitive media among the plurality of photosensitive media stop with a phase angle difference therebetween that is capable of compensating for image registration errors. | 06-24-2010 |
20100327512 | Paper feeding apparatus and image forming apparatus having the same - A paper feeding apparatus capable of preventing noises generated when picking up and transferring paper, and an image forming apparatus having the same. The paper feeding apparatus according to the present invention comprises a pickup unit, which is disposed upstream of a paper cassette relative to the direction in which the uppermost sheet of paper loaded in the paper cassette moves, to pick up the uppermost sheet of paper, and a lifting unit which lifts the sheet of paper vertically to reduce friction between the paper and the paper beneath it when the pickup unit picks up the sheets of paper. | 12-30-2010 |
20110097119 | Image forming apparatus and control method thereof - To restrict a period velocity change of a photoconductor that is an immediate cause of a color registration error, a gap change of a color registration error detection pattern caused by a linear velocity change of the photoconductor is acquired and a linear velocity change of the photoconductor is reduced based on a relationship between the gap change and a velocity of a motor, whereby a reduced color registration error is accomplished. | 04-28-2011 |
20110150516 | COLOR IMAGE FORMING APPARATUS - A color image forming apparatus includes a plurality of mark sensing devices are arranged between a plurality of photoconductors arranged on an intermediate transfer belt to sense a mark transferred to a region of the intermediate transfer belt corresponding to an interval between successive recording media. As an exposure time to form an electrostatic latent image on a photoconductor, on which a following developer image will be formed, is determined, minimized mis-registration and consequently, improved color registration correction efficiency are accomplished. Also, automatic color registration correction is performed on per printing operation basis, resulting in improvement in image quality. | 06-23-2011 |
20120087696 | Image forming apparatus and velocity control method of rotating body thereof - An image forming apparatus is configured to reduce a velocity fluctuation of a rotating body by reducing the AC velocity component of the rotating body. The image forming apparatus may include an image bearing body with a surface on which a toner image is formed; a driving motor configured to drive the image bearing body according to an input signal; and a controller configured to control the driving motor to output a motor output velocity at a period equal to that of an AC velocity component of the image bearing body. A velocity control method for the rotating body includes sampling a continuous motor input signal at a period equal to that of an AC velocity component of a rotating velocity of the rotating body. The sampled signal is transmitted to a driving motor that drives the rotating body, which is driven based upon the discrete motor input signal. | 04-12-2012 |
20130050723 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus and a control method thereof which execute auto color registration in consideration of mechanical change factors of both photoconductors and drive rollers. The control method of an image forming apparatus includes photoconductors, an intermediate transfer belt to which developers attached to the photoconductors are transferred, and drive rollers to drive the intermediate transfer belt, test patterns are printed on the intermediate transfer belt by adjusting a printing time interval of the test patterns according to a spatial period of the photoconductors and a spatial period of the drive rollers, if conditions to execute auto color registration (ACR) are satisfied, and ACR is executed according to a signal reflected by the test patterns. | 02-28-2013 |
20130322933 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - To restrict a period velocity change of a photoconductor that is an immediate cause of a color registration error, a gap change of a color registration error detection pattern caused by a linear velocity change of the photoconductor is acquired and a linear velocity change of the photoconductor is reduced based on a relationship between the gap change and a velocity of a motor, whereby a reduced color registration error is accomplished. | 12-05-2013 |