Carrier 1 rotates about fixed axis A and is connected by turning pair C to planet gear 3 which meshes with fixed internal sun gear 4. Crank 6 is rigidly attached to (or integral with) gear 3 and is connected by turning pair B to slider 5 which moves along circular slot d-d of link 2. Link 2 slides in fixed guide e. The pitch radius of gear 4 equals R=3r, where r is the pitch radius of gear 3 and equals length C͞B of crank 6. Centre O of circular slot d-d lies on the axis of guide e which passes through point A. Point B of crank 6 describes three-cusped hypocycloid b-b. If radius O͞B of circular slot d-d is designed so that the arc described passes through two cusps of hypocycloid b-b, then link 2 is almost stationary while point B travels along portion α-α of the hypocycloid.
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