Sheet post-processing apparatus

A sheet processing apparatus for a multi-function peripheral, comprising;

• a sheet transport path;
• at least one sheet holder moveable between a rest position and a sheet hand-off position distal in the sheet travel path direction from the rest position;
• a bundle hook moveable between a retracted position, a second sheet hand-off position, and an extended position distal in the sheet travel path direction from the sheet hand-off position;
• at least one sheet aligner movable between an extended position, wherein the at least one sheet aligner is contactable against a sheet in the sheet transport path, and a retracted position wherein the aligner is spaced from a location of any sheet in the sheet transport path;
• a first drive element configured to move the at least one sheet holder from the rest position to the sheet hand-off position;
• and
• at least one energy storage element selectively operatively connected to the first drive element and capable of storing energy as the sheet holder is moved by the first drive element from the rest position to the sheet hand-off position, wherein
• the energy storage element selectively discharges the energy stored therein to move the sheet holder from the sheet hand-off position to the rest position after the bundle hook is moved from the retracted position to the second sheet hand-off position.