Medium processing apparatus, loading apparatus and medium loading method

A medium processing apparatus, comprising:

• a printer provided with a discharge unit discharging a processed medium;
• a supporting member having a sheet-like shape and fixed, in part, to the printer, and moreover configured to support the medium discharged from the discharge unit;
• and
• a winding unit configured to wind the supporting member and move with respect to the printer, wherein
• the winding unit includes
• a winding shaft to which one end of the supporting member is attached,
• a rotation mechanism including a winding mechanism rotating the winding shaft in a direction of winding the supporting member and a stop mechanism configured to stop the winding shaft, in a first state in which a length of the supporting member unwound from the winding shaft is a first unwind amount, and in a second state in which a length of the supporting member unwound from the winding shaft is a second unwind amount that is greater than the first unwind amount,
• a first case positioned at one outer side of the supporting member in an axial direction of the winding shaft and rotatably supporting the winding shaft,
• a second case positioned at another outer side of the supporting member in the axial direction and rotatably supporting the winding shaft, and
• a placement portion that, when the winding unit is placed at a flat surface, contacts the flat surface.