Gear 1 rotates about fixed axis A and meshes with a driving gear (not shown). By means of a sliding key (not shown) on shaft A, the shaft can be connected to either segment gear 3 or gear 5. In the first case, rotation is transmitted to segment gear 3, and in the second, to gear 6 and segment gear 4 which rotate about fixed axis B. Segment gears 3 and 4 are rigidly attached to drivers with pins a that engage slots b in slotted gear 2. Gear 2 rotates about fixed axis C and its teeth d mesh with segment gears 3 and 4. Depending on whether the sliding key engages either segment gear 3 or gear 5, gear 2 rotates either counterclockwise or clockwise. While the teeth of segment gear 3 or 4 engage teeth d of gear 2, the gear rotates at uniform velocity. When pin a of either segment gear slides along a slot b of gear 2, the gear rotates at nonuniform velocity.
$2594$PG,ML$