Used paper supply device and sheet manufacturing apparatus

A used paper supply device comprising:

• a first paper feed unit and a second paper feed unit each of which feeds used paper and includes
• a tray that stores the used paper to be fed, and
• a moving mechanism that moves the tray between a paper feed position at which the used paper is fed and a retracted position that is retracted from the paper feed position;
• an air discharging unit that discharges an air toward a surface of a roller of each of the paper feed units;
• and
• a controller configured to control the first paper feed unit, the second paper feed unit, and the air discharging unit,
• wherein the controller is configured to control the moving mechanism of the first paper feed unit to move the tray of the first paper feed unit to the paper feed position, to control the first paper feed unit to feed the used paper, and configured to control the moving mechanism of the second paper feed unit to move the tray of the second paper feed unit to the retracted position, to control the air discharging unit to discharge the air toward the surface of the roller of the second paper feed unit, and
• the controller is configured to control the air discharging unit to discharge the air toward the surface of the roller of the second paper feed unit when the tray of the second paper feed unit is positioned at the retracted position, while the controller controls the first paper feed unit to feed the used paper when the tray of the first paper feed unit is positioned at the paper feed position.