Gears 1 and 2 rotate about fixed axes A and B. Gear 1 has groups of teeth located at various portions of its pitch circle. When gear 1 rotates, gear 2 has various rotation and dwell periods. The lengths of these periods depend upon the numbers of teeth in each group on the rim of gear 1. Unintentional motion of gear 2 and impacts at the instants of engagement of the teeth of the gears are avoided by providing the mechanism with supplementary conjugate cam surfaces (not shown) having profiles with special curves.
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