Abstract: An elliptically moving mechanism includes: a track disc formed with two tracks, the two tracks perpendicularly intersecting each other; a transmission ring rotatably fitted around a circumference of the track disc; a rocking arm positioned under the track disc; and two slide members disposed on a top face of the rocking arm. The rocking arm is connected to the two tracks via the two slide members. The two slide members are slidable along the two tracks respectively. When the transmission ring is rotated, the rocking arm is driven by the transmission ring to move in an elliptical path. The elliptically moving mechanism is easy to manufacture and assemble and has a small volume and is lightweight. Moreover, the mechanism provides different elliptical paths of different sizes.

Abstract: An adjustable rotary structure comprises a first restricting assembly, a second restricting assembly, a rotary member and a positioning seat. The rotary member is formed with a restricting hole and a shift hole. The positioning seat is formed with a positioning groove, a restricting circular groove and a restricting elliptic groove. The first restricting assembly is positioned on the positioning groove by the restricting hole in such a manner that the restricting hole of the rotary member abuts against the positioning groove and is restricted on the positioning seat. The second restricting assembly is selectively positioned in the restricting circular groove or the restricting elliptic groove via the shift hole, so that the rotary member is forced to rotate along a circular path or an elliptic path.

Abstract: An ellipse drawing/cutting device is made up a base plate, a driving gear, a coil spring, a driven gear, a position retaining arm, a compression spring, a longitudinal measurement disc, a first fixing ring cover for the longitudinal measurement disc, a lateral measurement disc, a second fixing ring cover for the lateral measurement disc, a slide bracket assembly including a ruler frame, a pair of slide wings and cover two plates; a link bar, a plurality of anti-slip blocks disposed under the base plate, and a plurality of differently spaced pen insertion holes are distributed on the ruler frame which is relatively slidable on the lateral measurement disc.