Recording paper cutting device and printing device

A recording paper cutting device for cutting a boundary between a first area of a recording paper and a second area of the recording paper placed at an upstream side of the first area so that the first area is separately discharged from the second area after the first area is printed with a first piece of information, the recording paper cutting device comprising:

• a first cutting part and a second cutting part, wherein:
• at least one of the first cutting part and the second cutting part moves in an approaching direction or a departing direction so that the boundary is cut;
• the first cutting part includes a first cutting surface configured to increase a gap between the first area and the second area by a first rate of increase and a second cutting surface configured to increase the gap by a second rate of increase depending on a degree in which the first cutting part is moved in the approaching direction to the second cutting part;
• the first cutting part includes a facing surface which is facing the second cutting part when the at least one of the first cutting part and the second cutting part moves in the approaching direction so that the boundary is cut;
• and
• the first cutting surface and the second cutting surface are formed at the other side of the first cutting part from which the facing surface is formed.

A printing device comprising:

• a main body part configured to provide a predetermined inner space;
• a printing part configured to print a first area of a recording paper disposed in the inner space with a first piece of information;
• and
• a cutting part configured to cut a boundary between the first area of the recording paper and a second area of the recording paper placed at an upstream side of the first area so that the first area is separately discharged from the second area, wherein:
• the cutting part includes a first cutting part and a second cutting part;
• at least one of the first cutting part and the second cutting part moves in an approaching direction or a departing direction so that the boundary is cut;
• the first cutting part includes a first cutting surface configured to increase a gap between the first area and the second area by a first rate of increase and a second cutting surface configured to increase the gap by a second rate of increase depending on a degree in which the first cutting part is moved in the approaching direction to the second cutting part;
• the first cutting part includes a facing surface which is facing the second cutting part when the at least one of the first cutting part and the second cutting part moves in the approaching direction so that the boundary is cut;
• and
• the first cutting surface and the second cutting surface are formed at the other side of the first cutting part which the facing surface is formed.