Carrier 1 rotates about fixed axis A and is connected by turning pair C to planet gear 3 which meshes with internal fixed 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 slot a-a of link 2. Link 2 rotates about axis A. The pitch radius of gear 4 equals R=4r, where r is the pitch radius of gear 3 and equals the length of crank 6. The axis of slot a-a passes through point A. Point B describes four-cusped hypocycloid b-b. In each full revolution of carrier 1, point B coincides four times with points d, the cusps of hypocycloid b-b. At these positions, link 2 has instantaneous dwells.
$2515$LrG,D$