Patent ID: 6895212

Claim:
A paper post-processing apparatus for folding a paper ejected from an image forming apparatus at a paper folding process section, the paper folding process section comprising: a pair of folding rollers contacting each other with a prescribed pressure, and each of the pair of folding rollers is rotatably supported by a shaft; a pair of fold/transporting rollers each of which contacts with each of the pair of folding rollers with a prescribed pressure, and is rotatable; a driving unit for driving the pair of folding rollers; a folding roller moving unit for moving the pair of folding rollers to a pressure contact position and to a releasing position; and a drive switching unit for switching a rotation direction of the pair of folding rollers, wherein when transporting a paper without folding the paper at the paper folding process section, the holding roller moving unit moves the pair of folding rollers to a releasing position, and the drive switching unit switches the rotation direction of the pair of folding rollers to the same direction with each other; and when folding the paper at the paper folding process section, the holding roller moving unit moves the pair of folding rollers to the pressure contact position, and the drive switching unit switches the rotation direction of the pair of folding rollers to the reverse direction with each other.