To control a cutting blade such that the direction of the cutting edge of the cutting blade when only the recording paper of a roll paper for a tack paper sheet is half-cut is pointed in the cutting direction.

The size of the mold release paper 4 of a roll 2 is more increased in size by H3 than the width size of a recording paper 3 temporarily stuck thereon, the mold release paper is extended externally of one side edge of the recording paper 3, and the part forms an adjustment part 4a by which the mold release paper 4 is exposed. The offset cutting edge 43a of the cutting blade at the lower end of a cutter shaft 40 rotatably mounted on a cutter holder is brought into contact with the upper surface position separated away from the recording paper 3 in the adjustment part 4a, and when, with this state, the cutter holder is moved in the direction to be cut, the cutter shaft 40 is rotated around a rotation central line and the cutting edge 43b is pointed in the direction to be cut.