Patent ID: 8414099

Claim:
A printing control method for a printer that is connectable to a host device, conveys paper through a transportation path, and prints while moving a print head mounted on a carriage, the printing control method comprising a step of: determining that the paper is set to a position referenced to a center of the transportation path in the paper width direction when paper width information is received from the host device; and determining that the paper is set to a position referenced to an edge of the transportation path in the paper width direction when paper width information is not received from the host device, wherein a maximum width of paper that can be set in the transportation path is pre-stored in memory; and when printing without receiving the paper width information, the maximum paper width is set as the paper width of the paper used for printing, and a distance L from a left edge of the transportation path to a start printing position is set to L=Lm where Lm is a margin on a left side of the paper.