
A driver structure configured to drive a U-character shaped staple including a pair of leg portions configured to pass through a bundle of papers and a crown for connecting the leg portions, the driver structure including a blade edge disposed to be in contact with the staple, first projecting parts provided at opposite end portions of the blade edge and disposed to be in contact with a corner between the crown and each of the leg portions for pressing the leg portions perpendicularly when the p...











