| 摘要 |
A paper post-processing apparatus for punching a paper to make a hole for filing, comprising a punching unit (430) and a transporting roller (412,413) for nipping and transporting the paper arranged at the downstream side of the punching unit (430) in a paper transport direction. An actuator (434,435) is provided for releasing the nipping of the paper by the transporting roller. An aligning unit (441,442) is provided for aligning the paper laterally in the direction of a paper width perpendicular to the paper transport direction, and a stopper member (448) is arranged at the upstream side of the punching unit (430) in the paper transport direction and can be inserted into or retreated from a paper transporting path. In operation, the transporting roller nips and transports the paper under the condition that the stopper member is retreated from the paper transporting path, then the actuator is energized to release nipping of the paper after at least the leading edge portion of the paper has passed through the punching unit, the aligning unit aligns the paper laterally, the energizing of the actuator is stopped so that the transporting roller nips the paper again, and the punching unit punches the paper, after the stopper member inserted into the paper transporting path hits a trailing edge of the paper. |
