Patent ID: 7874558

Claim:
A sheet processing apparatus comprising: a conveying portion which conveys a sheet; an aligning member, provided at a side surface of a main body of the sheet processing apparatus, which supports and aligns the conveyed sheet and is movable in a widthwise direction orthogonal to a sheet conveying direction to align the sheet in the widthwise direction; a stacking portion which is provided below a position of the conveyed sheet to be aligned by the aligning member and stacks the aligned sheet; and a controller which controls said aligning member so that the aligning member moves more outwardly than an end portion of the supported sheet in the widthwise direction to drop the supported sheet to the stacking portion, and so that a standby position of the aligning member, where the aligning member is on standby when said sheet processing apparatus is in a power off state, is at a position more inwardly by a predetermined amount than the outermost position in the widthwise direction.