Link 1 is connected by turning pairs A and B to links 2 and 4. Links 2 and 4 have slots c and d that slide along fixed pin E. These links have teeth a and b at their ends. Gear 3 rotates about fixed axis F. When link 1 rotates about fixed axis C, teeth a and b of links 2 and 4 alternately engage successive teeth of gear 3, rotating the gear intermittently. In one complete revolution of link 1, gear 3 is indexed through an angle of α=720°/z, where z is the number of teeth of gear 3.
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