Sheet stacking apparatus, control method of same, and sheet conveying system

A sheet conveying system comprising:

• a printer;
• a sheet stacking apparatus configured to receive printed sheets from the printer at a receiving position and to stack the printed sheets;
• a plurality of sheet processing machines to which the printed sheets are supplied from the sheet stacking apparatus at a supply position being different from the receiving position;
• a vehicle configured to convey the sheet stacking apparatus from the receiving position to the supply position;
• a management device configured to manage the printer, the sheet stacking apparatus, the plurality of sheet processing machines, and the vehicle,
• wherein the management device is configured to generate conveyance instruction information for conveying the sheet stacking apparatus from the receiving position to the supply position of any one of the plurality of sheet processing machines based on job information including a manufacturing process procedure for manufacturing a printed product,
• the vehicle is configured to convey the sheet stacking apparatus from the receiving position to the supply position of any one of the plurality of sheet processing machines based on the conveyance instruction information,
• the sheet stacking apparatus comprises:
• a shelf unit in which a printed sheet from a printer is received and stacked,
• a lifting and lowering mechanism that lifts and lowers the shelf unit, and
• a control unit that controls the lifting and lowering mechanism, the control unit controlling the lifting and lowering mechanism to lift and lower the shelf unit to a first predetermined height corresponding to the printer at the receiving position, and to lift and lower the shelf unit to a second predetermined height corresponding to a sheet processing machine at the supply position, the first predetermined height being acquired from the job information and being individually set depending on a type of the printer, the second predetermined height being acquired from the job information and being individually set depending on a type of the sheet processing machine.