Sheet treating apparatus and image forming apparatus

A sheet treating apparatus for treating a sheet delivered from an image forming apparatus main body, comprising:

• a first intermediate stacking portion for hitting an edge of the sheet in a transport direction of the sheet against a wall to align the sheet;
• delivery means for delivering the sheet from the first intermediate stacking portion;
• a second intermediate stacking portion provided with a function for carrying-in and supporting the sheet downstream of the delivery means in the transport direction and aligning edges of the sheet in a cross direction perpendicular to the transport direction;
• a sheet stacking portion located below the second intermediate stacking portion in a gravitational direction;
• and
• full load detecting means for detecting full load of sheets on the sheet stacking portion,
• wherein the full load detecting means contact an upper surface of sheets on the sheet stacking portion with a full load detecting flag, which has a pivotal fulcrum in a higher position than that of the delivery means, to detect a height of the upper surface, and does not perform full load detection of sheets during a sheet treatment in the intermediate stacking portions.