Patent ID: 7392983
Filing Date: 2008-07-01
Classification: B65H

Abstract:
1. A sheet post-processing unit, comprising: sheet stacking means for sequentially stacking sheets discharged one after another; sheet conveying means including at least one roller rotatably supported by an arm movably supported along an axis and rockably supported in up and down directions, and an actuator for moving said arm in the up and down directions, said sheet conveying means being capable of selectively conveying a sheet to be discharged in one of the downstream and upstream directions of a sheet discharging direction and being capable of moving up and down to be contactable with and detachable from the sheet; an upstream edge regulating member for aligning a sheet stacked on said sheet stacking means by hitting against an upstream edge of the sheet; intersectional moving means for moving said arm of said sheet conveying means along the axis in a direction intersecting with the sheet discharging direction; and an intersectional regulating member for aligning the sheet by hitting against an edge of the sheet on a side intersecting with the sheet discharging direction, wherein said roller of said sheet conveying means aligns the sheet by contacting with an uppermost sheet of the sheets stacked on said sheet stacking means and by moving the sheet in the direction intersecting with the sheet discharging direction by said intersectional moving means to hit the uppermost sheet against said upstream edge regulating member and said intersectional regulating member, and wherein said stacking means is a first sheet stacking means: second sheet stacking means, disposed in a vicinity of said first sheet stacking means and movable in a vertical direction for stacking the sheets; and transfer means for clamping and transferring the sheets stacked on said first sheet stacking means to said second sheet stacking means.