Segment gears 1 and 2 rotate about fixed axes A and B. When noncircular driving gear 1 rotates continuously, eccentric driven gear 2 rotates intermittently with dwells. Concentric locking surface a engages a concave surface on gear 2 to avoid unintentional rotation of this gear during its dwell periods. Rolling levers c and d, mounted rigidly on gears 1 and 2, come into contact before the instant of engagement of the gear teeth. This provides smooth velocity increase of driven gear 2 and thereby reduces impacts that may occur when the teeth come into engagement. The pitch point of levers c and d lies on the line of centres AB of gears 1 and 2 only at the initial instant of contact of the levers. During the rest of the period of engagement, it does not lie on line AB. The relative motion of levers c and d consists of sliding as well as rolling motion.
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