Stapling device

A stapling device, comprising:

• a needle driving unit for driving a needle into a set of sheets,
• a bending unit for bending the needle driven into the set of the sheets, said bending unit being located at a side opposite to the needle driving unit relative to the set of sheets to be bound,
• two pairs of front and rear guide shafts for supporting the needle driving unit and the bending unit and guiding the respective units to move in a sheet width direction,
• moving shafts for moving the needle driving unit and the bending unit along the guide shafts in the sheet width direction, each of the moving shafts being disposed between the front and rear guide shafts in each pair, and
• a sheet path guide member extending between the front and rear guide shafts in one of the pairs to be disposed between the needle driving unit and the bending unit, said sheet path guide member having a spring member wound around one of the guide shafts and being capable of expanding and contracting in accordance with movements of the needle driving unit and the bending unit along the guide shafts to allow the sheet path guide member to move in an axial direction of the guide shafts.