Patent ID: 8251272

Claim:
A stapler comprising: a forming plate configured to form a straight staple into U-shape; a pusher configured to push the formed U-shape staple in a first direction toward a driving portion; a driver plate configured to drive the staple within the driving portion toward sheets of paper; an engaging portion formed on the forming plate; and a receiving portion formed on the pusher, wherein the engaging portion is configured to engage with the receiving portion, during a driving operation of the driver plate, so as to prevent the pusher from moving in a second direction which is opposite to the first direction, the engaging portion includes a first inclined surface, the receiving portion includes a second inclined surface formed in the pusher at a side of the second direction, by engaging the first inclined surface with the second inclined surface, the pusher is prevented from moving to the second direction, the driver plate is movable in a third direction perpendicular to the first direction to drive the stapler toward the sheets, the second inclined surface comprises a flat surface inclined toward the third direction along the second direction, and the first inclined surface is parallel to the second inclined surface.