Slider 3 moves along slot a of slotted link 4 and is attached by turning pair D to connecting rod 2 of slider-crank linkage ABC. Slotted link 4 turns about fixed axis E. When crank 1 rotates about fixed axis A, point D of connecting rod 2 describes a connecting-rod curve. If point E is within the area circumscribed by point D, slotted link 4 makes complete revolutions about axis E. If not, then link 4 only oscillates about axis E.
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