Gear 1 rotates about fixed axis A and meshes with gear 6 which rotates about fixed axis B. Gear 6 meshes with gear 7 which rotates about fixed axis C. Crank 2 is rigidly attached to gear 1 and imparts reciprocating motion along axis x-x to slotted link 3 and to plane table 5, attached to link 3. Crank 8 is rigidly attached to gear 7 and imparts reciprocating motion along axis y-y to slotted link 9 and to pencil k mounted on link 9. Frame 10 is fixed by clamping. As a result of the addition of the motions of the plane table and pencil, curve q is described in the coordinate system with the axes x-x and y-y. The shape of the curve traced by pencil k is changed by changing the transmission ratio of change gears 1 and 7. When the gears are changed, the stud of intermediate gear 6 is adjusted and clamped in the required position along slotted element 4 of frame 10.
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