Sheet paper stacking apparatus

Apparatus for receiving sheets of paper one by one to arrange them in the form of a stack and then discharging the thus stacked sheets of paper one by one, comprising:

• a bottom plate on which said stack is to be formed;
• side reference means for providing a side reference line with which one side edge of each of said sheets of paper is to be aligned;
• front reference means for providing a front reference line with which the front edge of each of said sheets of paper is to be aligned;
• rotating means disposed above said bottom plate, said rotating means being movable between two positions including an operative position where said rotating means brings said sheets of paper into alignment with said side and front reference lines during a sheet paper receiving mode and an inoperative position where said rotating means is separated away from said stack during a sheet paper discharging mode;
• a discharging path for receiving sheets from said stack, said discharging path extending from an entrance thereto located above said front reference means;
• discharging means disposed in the vicinity of the entrance of said discharging path for discharging said stacked sheets of paper one by one upon contact during a sheet paper discharging mode;
• and
• control means for changing the relative positional relation between said bottom plate and said discharging means such that the topmost sheet of said stack is located away from said discharging means during a sheet paper receiving mode and the topmost sheet of said stack is in contact with said discharging means during a sheet paper discharging mode.