Abstract: A paper cassette of an image forming apparatus including: a cassette body containing sheets of paper, and a paper alignment apparatus mounted in the cassette body. The paper alignment apparatus including: an alignment apparatus body having a paper alignment surface contactable with corners of one side of sheets of paper and slidable in a horizontal direction, and a locking unit mounted in the alignment apparatus body and locked into the cassette body. The locking unit is downwardly pressed when being locked and unlocked.

Abstract: This invention relates to a method of preparing an oxygen reduction reaction catalyst, an oxygen reduction reaction catalyst prepared thereby, and an electrode for a metal-air battery using the oxygen reduction reaction catalyst, wherein transition metal ions are adsorbed on a commercially available melamine foam and carbonized, and carbon black is supported on a porous structure of the carbonized melamine foam support, thereby economically preparing the oxygen reduction reaction catalyst that is able to maximize an effect of promoting the oxygen reduction reaction.

Abstract: A paper cassette of an image forming apparatus including: a cassette body containing sheets of paper, and a paper alignment apparatus mounted in the cassette body. The paper alignment apparatus including: an alignment apparatus body having a paper alignment surface contactable with corners of one side of sheets of paper and slidable in a horizontal direction, and a locking unit mounted in the alignment apparatus body and locked into the cassette body. The locking unit is downwardly pressed when being locked and unlocked.

Abstract: An image forming apparatus and an auto color registration method thereof, the auto color registration (ACR) method including: transferring test patterns respectively corresponding to a plurality of colors; detecting the transferred test patterns; cleaning the transferred test patterns; transferring patterns respectively corresponding to the plurality of colors by reducing a width of a pattern corresponding to a color, from among the plurality of colors, according to the detected test patterns; and performing ACR on the basis of the transferred pattern. Accordingly, at least one pattern width is reduced in consideration of deviation in a detected pattern width between a plurality of colors, and ACR is performed on the basis of the reduced pattern width, thereby decreasing an error and increasing reliability in the ACR.

Abstract: A printing medium detecting device capable of accurately detecting an amount of printing media in a paper cassette, an image forming apparatus including the printing medium detecting device, and a method to detect a printing medium. The printing medium detecting device of the image forming apparatus includes a light source to emit a light beam to one side of a stack of printing media housed in a paper cassette, a scanning unit to scan the light beam reflected from the stack and generate a signal based on the light beam, and a computing unit to compute information related to the stack based on the signal, wherein the information includes a number of printing media sheets in the stack.

Abstract: An image forming apparatus and an auto color registration method thereof, the auto color registration (ACR) method including: transferring test patterns respectively corresponding to a plurality of colors; detecting the transferred test patterns; cleaning the transferred test patterns; transferring patterns respectively corresponding to the plurality of colors by reducing a width of a pattern corresponding to a color, from among the plurality of colors, according to the detected test patterns; and performing ACR on the basis of the transferred pattern. Accordingly, at least one pattern width is reduced in consideration of deviation in a detected pattern width between a plurality of colors, and ACR is performed on the basis of the reduced pattern width, thereby decreasing an error and increasing reliability in the ACR.

Abstract: A printing medium detecting device capable of accurately detecting an amount of printing media in a paper cassette, an image forming apparatus including the printing medium detecting device, and a method to detect a printing medium. The printing medium detecting device of the image forming apparatus includes a light source to emit a light beam to one side of a stack of printing media housed in a paper cassette, a scanning unit to scan the light beam reflected from the stack and generate a signal based on the light beam, and a computing unit to compute information related to the stack based on the signal, wherein the information includes a number of printing media sheets in the stack.

Abstract: An image forming apparatus includes a housing, an operation panel movably installed at the housing via a rotary shaft and having multiple buttons provided thereon, and a position adjustment unit to move the operation panel at a predetermined angle with respect to the housing and to maintain the operation panel at the predetermined angle.

Abstract: An image forming apparatus includes a housing, an operation panel movably installed at the housing via a rotary shaft and having multiple buttons provided thereon, and a position adjustment unit to move the operation panel at a predetermined angle with respect to the housing and to maintain the operation panel at the predetermined angle.

Abstract: A knock-up plate lifting device for lowering a knock-up plate while inserting and withdrawing a paper feeding cassette, and lifting the knock-up plate when the paper feeding cassette is completely mounted. The knock-up plate lifting device includes a mounting board. A first link is pivotably mounted by a first hinge to the mounting board and has arms extended away from the first hinge. A resilient member is connected to one of the arms of the first link. A second link is pivotably mounted by a second hinge to the mounting board and extends away from the second hinge by a predetermined angle. One arm of the second link is connected with the resilient member and the other arm moves up and down in accordance with the operation of the first hinge.

Abstract: An image forming apparatus includes a housing, an operation panel movably installed at the housing via a rotary shaft and having multiple buttons provided thereon, and a position adjustment unit to move the operation panel at a predetermined angle with respect to the housing and to maintain the operation panel at the predetermined angle.

Abstract: A printing media feeder of a printing apparatus, having: a printing media feeder frame with a predetermined space and a front opening and side openings communicating with the space; a feeding cassette movably mounted in the space of the printing media feeder frame to enter in and come out of the space through the front opening; and a pickup unit mounted on a side of the printing media feeder frame and integrally having a cassette guide to guide movement of the feeding cassette. The pickup unit includes a body frame and the cassette guide may be formed as a separate member to be mounted on the body frame, or may be integrally formed with the body frame.