The mechanism is intended for tracing ovals. Faceplate 1 rotates about fixed axis A and is connected by turning pair B to planet gear 5 which meshes with fixed sun gear 6. Crank 2 is rigidly attached to gear 5 and is connected by turning pairs B and C to faceplate 1 and to slider 3 which moves along vertical slot x-x of slide 4. Slide 4 moves along horizontal fixed guides y-y. When driving faceplate 1 rotates, gear 5 rolls around gear 6 and a pencil attached to slide 4 describes an oval on faceplate 1. The shape of the oval depends upon the transmission ratio of the gears.
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