Upon occurrence of a paper jam at a circulation conveyer with a switching direction being set at a paper discharge guiding direction, a controller performs control of maintaining the switching direction at the paper discharge guiding direction and discharging sheets at a section of the circulation conveyer downstream of a position of the paper jam, the printing conveyer, and the paper discharger. Upon occurrence of the paper jam with the switching direction being set at a circulation guiding direction, the controller performs control of switching the switching direction to the paper discharge guiding direction after a sheet passing a switch exits the switch, and discharging the sheets at the section of the circulation conveyer downstream of the position of the paper jam, the printing conveyer, and the paper discharger.