Abstract: A cutting machine includes a bright/dark color cylinder having a triangle bright area formed thereon as driven by a driving shaft synchronously driving a set of conveying rollers forwarding a strip of article to be cut and driving a pair of cutting knives, and a photo controller longitudinally moving above the bright/dark color cylinder to sense a light signal from the triangular bright area of the cylinder to run the rollers and the strip, and/or to shield the light signal from a dark color area on the cylinder to thereby stop the rollers and the strip adapted to be cut by the cutting knives, whereby upon the moving of the photo controller above the cylinder, a linear length of the triangle bright area on the cylinder periphery can be adjusted to thereby optionally adjust the cutting length of the strip article.