| 摘要 |
A sheet processing apparatus comprises a first conveyer roller pair arranged at the upstream side of a sheet conveyance route and a second conveyer roller pair arranged at the downstream side of the sheet conveyance route so as to convey a sheet of paper from the upstream side to the downstream side. Additionally, a punching unit is arranged between the first conveyer roller pair and the second conveyer roller pair. The second conveyer roller pair is made to operate as a slipping roller after the time when the leading end of the sheet of paper being conveyed passes the first conveyer roller pair and a stopper is made to appear at a position downstream relative to the second conveyer roller pair so as to make the leading end of the sheet of paper abut the stopper in order correct the skew, if any, of the sheet of paper.
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