Paper discharge apparatus

A paper discharge apparatus comprising:

• a pair of guide side plates including first rail grooves configured to circulate in a transfer direction of paper transferred to a paper stacking plate and curved cams adjacent to the first rail grooves;
• a pair of paper gripping units to grip the paper received on the paper stacking plate when making contact with the curved cams while moving along the first rail grooves of the guide side plates;
• a first driving unit to drive the paper gripping units to allow the paper gripping units to circulate along the first rail grooves;
• an aligning stopper for discharged paper, which is provided between the guide side plates to straightly move by a predetermined distance in the paper transfer direction from front end portions of the guide side plates;
• a second driving unit to previously move the aligning stopper in the paper transfer direction just before the paper gripping units reach the front end portions of the guide side plates;
• and
• a stapler having an opening, wherein the stapler is installed outside the front end portions of the guide side plates such that the stapler is movable linearly,
• wherein the aligning stopper includes second rail grooves provided in inner surfaces of the guide side plates in parallel to the first rail grooves, respectively, a slide block having both ends fitted into the second rail grooves to move back and forth along the second rail grooves, and an ejector plate coupled with a top surface of the slide block to stop and transfer an end portion of the paper which is transferred to the paper stacking plate, in which the slide block moves back and forth along the second rail grooves by the second driving unit.