Patent ID: 9067753
Filing Date: 2015-06-30
Classification: B65H

Abstract:
1. A sheet stacking apparatus comprising: a discharge portion which discharges a sheet; a stacking portion including a stack tray on which the sheet discharged from the discharge portion is stacked and a sheet stack height detecting portion which detects a stack height of the sheets stacked on the stack tray, the stack tray being movably arranged in a sheet stack height direction so that a position of a top surface of the stacked sheets is maintained in accordance with a detection result obtained by the sheet stack height detecting portion; a pair of aligning members which is provided above the stack tray to be lifted and lowered and which moves in a width direction perpendicular to a discharge direction of the sheet to sandwich and align the sheet stacked on the stack tray at a downstream area from the sheet stack height detecting portion in the discharge direction; a stack amount detecting portion which detects a stack amount of the sheets stacked on the stack tray, the stack amount detecting portion configured to include a movement amount detector which detects a movement amount of the stack tray in the sheet stack height direction, and the stack amount detecting portion detects the stack amount of the sheets stacked on the stack tray according the movement amount of the stack tray in the sheet stack height direction, the movement amount being detected by the movement amount detector; and a controller which controls so as to move the pair of aligning members downwardly in the sheet stack height direction when the movement amount of the stack tray in the sheet stack height direction, which is detected by the movement amount detector, is equal to or larger than a predetermined amount.