Patent ID: 7213986

Claim:
A printer apparatus for printing data on paper traveling through the printer apparatus in a paper conveying direction, the printer apparatus comprising: a paper conveying portion including a driving roller and a driven roller, the driving roller and driven roller being moveable with respect to one another between an engaged position at which the driving roller and the driven roller are pressed together and a disengaged position at which the driving roller and the driven roller are separated; a platen member positioned in a manner slightly tilting in a predetermined angle with respect to a line that perpendicularly intersects with center line of a paper conveying path; and a paper guide member situated on one of the sides in the width direction of the printer apparatus so that a rim part of the paper abuts the paper guide member when the paper is conveyed through the platen member, wherein the paper conveying portion is situated downstream, with respect to the paper conveying direction, from the location at which the data is printed on the paper, the driving roller and the driven roller pressingly sandwich the paper therebetween when the driving roller and the driven roller are in the engaged position, the driving roller is configured to rotate in a clockwise direction and a counter-clockwise direction, the driving roller includes a roller part that has a plurality of fine protrusions, disposed on a surface of the roller part, which dig into the paper when the paper is pressingly sandwiched between the driving roller and driven roller, and the height of the fine protrusions is smaller than the thickness of the paper.