Patent ID: 8267496

Claim:
A printer comprising: a conveyer unit for conveying a printing medium that is long sized; a printing head for carrying out printing on the printing medium that is conveyed, the printing being carried out by forming each array of dots aligned on each of a plurality of printing lines, the printing lines being in orthogonal direction to a conveying direction and provided at intervals obtained by dividing a unit length of the printing medium by resolution; and a cutter that is arranged at downstream of the conveying direction in comparison with the printing head, wherein the printing head carries out temporary stop of printing for allowing the cutter to cut off a front margin of the printing medium, the front margin being formed so as to start from a point of a start of printing in a direction reverse to a printing direction, wherein the resolution includes first resolution and second resolution, first printing lines are provided at intervals obtained by dividing the unit length by a numerical value of the first resolution and a dot array with the second resolution is formed so as to occupy two or more of first printing lines, wherein the printer further comprises a judgment unit that judges whether or not number of dot-array-formed first printing lines from the start of printing till the temporary stop of printing with the second resolution is equal to number of dot-array-formed first printing lines in printing with the first resolution, each of the dot-array-formed first printing lines being a first printing lines on which an array of full-dots or an array of dot portions is formed, and wherein, in case the judgment unit judges that the number of the dot-array-formed first printing lines in printing with the second resolution is not equal to the number of the dot-array-formed first printing lines in printing with the first resolution, a portion of serial arrays of dots to be formed from the start printing till the temporary stop of printing with the second resolution is formed with the first resolution so that the number of the dot-array-formed first printing lines is made equal to the number of the dot-array-formed first printing lines in printing with the first resolution.