Printer

A printer comprising:

• a print unit including at least one print head;
• a pair of registration rollers for feeding a print sheet to the print unit;
• a first sheet supply unit including a first feed roller that feeds a print sheet to the pair of registration rollers, and operates, by rotating in synchronization with the pair of registration rollers, an assistant operation to assist feeding of the print sheet by the pair of registration rollers;
• a second sheet supply unit including a second feed roller that feeds a print sheet to the pair of registration rollers;
• a drive unit that selectively drives the first feed roller and the second feed roller;
• and
• a controller that controls the drive unit, wherein
• the controller, when changing over a sheet supply source of print sheets from the first sheet supply unit to the second sheet supply unit in the assistant operation by the first feed roller, finishes the assistant operation before a trailing edge of a print sheet currently fed has passed through the first feed roller by stopping the drive unit.