Movable bevel gear 2 rolls around fixed bevel gear 1. Gear 2 rotates about axis B and, together with link 5, rotates about fixed axis A. Connected rigidly to gear 2 is screw 3 which is connected by a screw pair to slider 4. Slider 4 moves along guide a of link 5. When link 5 rotates about axis A, point C of link 4 describes portion b of an Archimedian spiral.
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