Mechanical ellipsograph

The utility model discloses a mechanical ellipsograph, and relates to a plotter. The mechanical ellipsograph comprises a rack, a fixing shaft, a large gear, a toothed bar, a spiral spring, a moving shaft, a small gear, a moving frame and a moving stripe with a pen clip, wherein the driving ratio of the large gear to the small gear is 2:1; a sliding groove used for penetration of the toothed bar is formed in the rack; the fixing shaft is connected with one end of the rack; the large gear is fixedly connected onto the fixing shaft, and meshed with the toothed bar; a positioning boss protruding from the outer surface of the fixing shaft is arranged on the lower side at the position, where the large gear is mounted, of the fixing shaft; the spiral spring sleeves the fixing shaft, and is propped against the position between the positioning boss and the large gear; the moving shaft is connected with the end, far away from the fixing shaft, of the rack; the small gear is fixedly connected onto the moving shaft, and meshed with the toothed bar; the moving frame is connected with bottom end of the moving shaft; a through groove used for embedding of the moving strip is formed in the moving frame, that is, one end of the moving strip is embedded in the through groove in the moving frame; a brush positioning hole is formed in the other end of the moving strip. The mechanical ellipsograph is simple in structure, convenient to use, and high in drawing accuracy.