Automatic cutter and printer with automatic cutter

A printer with an automatic cutter can discharge cut-offs from a narrow paper exit in a stable condition. The bottom edge 5a of the paper exit 5 of an automatic cutter 20 is determined by a horizontal stage surface 40, the top edge 5b is determined by a paper exit ceiling surface 50, and the size of the opening therebetween is the short distance from slightly below the cutting edge 22a of the movable knife 22 in the cutting-completed position D to the top edge of the cutting edge 21a of the fixed knife 21. The stage surface 40 extends horizontally for a specific width along the edge of the fixed knife 21 in the direction of the paper width at a position slightly below the cutting edge 22a of the movable knife 22 in the cutting-completed position D. The upstream end part of the cut-off portion 11c is therefore not pushed down when the movable knife 22 moves to the cutting-completed position D, the upstream end of the cut-off portion 11c is always above the bottom edge 5a of the paper exit 5, and is not curled. Furthermore, because the cut-off portion 11c rests on the stage surface 40 when cutting is completed, the cut-off portion 11c can be removed from a stable location.