THREE-LINK TOOTHED GEARING WITH DWELLS OF THE DRIVEN LINK AND WITH ROLLING LEVERS

Segment gears 1 and 2 rotate about fixed axes A and B. When driving gear 1 rotates continuously, driven gear 2 rotates intermittently with dwells. Concentric locking surface a-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. Arcs b of gear 1 are described with a smaller radius than arc a-a so that gear 2 can turn freely at the instant of contact of the profiles of levers c and d. Pitch point P of levers c and d lies on the line of centres AB of the gears during the whole period of lever engagement. Thus the relative motion of levers c and d consists of pure rolling without sliding.
$2361$SG,D$