Patent ID: 8714688

Claim:
A paper width detection method for a label printer, comprising: performing a first paper width detection step of scanning a paper width detector in a paper width direction and detecting a left edge position and a right edge position of a recording medium at a predetermined position on a transportation path for conveying a recording medium having a liner with removably affixed labels; after performing the first paper width detection step, performing a paper transportation step of conveying the recording medium a distance that is shorter than the transportation direction length of the label and is longer than the gap between labels; after performing the paper transportation step, performing a second paper width detection step of scanning the paper width detector in the paper width direction and detecting a left edge position and a right edge position of the recording medium; and after performing the second paper width detection step, performing a paper width determination step of determining the paper width of the recording medium based on the detection result of the first paper width detection step and the detection result of the second paper width detection step.