Patent ID: 8554124

Claim:
A printing medium feeding apparatus comprising: a feeding part which feeds a printing medium; and a printing medium aligning roller part which aligns a leading edge of the printing medium fed from the feeding part and transfers the aligned printing medium to an image forming part which forms an image on the printing medium, wherein the printing medium aligning roller part comprises: a pair of rollers which transfer the printing medium to the image forming part, and an aligning shutter which is rotationally coupled to one of the pair of the rollers, rotates according to whether the printing medium contacts the aligning shutter with a pressure greater than a reference pressure in a reference direction, and guides the leading edge of the printing medium fed from the feeding part toward the reference direction, wherein the feeding part comprises a plurality of feeding cassettes which feed a first printing medium from a first direction and a second printing medium from a different second direction to the printing medium aligning roller part, wherein the aligning shutter comprises: a shutter main body which is rotationally coupled to a rotational shaft of the roller to which the aligning shutter is rotationally coupled to, and a guiding surface which protrudes from one side of the shutter main body to contact the leading edge of the first printing medium and the leading edge of the second printing medium and guide the respective leading edges of the first and the second printing mediums in the same reference direction, wherein the guiding surface has a semicircular, concave shape so that the leading edges of the first and the second printing mediums are smoothly guided in the same reference direction by the semicircular, concave shape.