Patent ID: 8083220

Claim:
A sheet processing apparatus for performing post-processing on sheets conveyed from an image forming apparatus, comprising: a buffer section configured to cause a sheet conveyed from the image forming apparatus to be temporarily held back therein, and superpose the held-back sheet and a following sheet in a state displaced in a conveying direction of the sheet; a tray configured to stack thereon a sheet bundle superposed by said buffer section and conveyed; an alignment unit configured to align the sheet bundle stacked on said tray in the conveying direction; a first measurement section configured to measure a length in the conveying direction of the sheet to be held back in said buffer section; a second measurement section configured to measure a length in the conveying direction of the sheet bundle of the superposed sheets; and an adjustment section configured to adjust a displacement amount in the conveying direction of the sheets superposed by said buffer section, said adjustment section adjusting the displacement amount, such that a difference between a result of measurement by said first measurement section and a result of measurement by said second measurement section is caused to be a target amount.