Gear 3 is keyed to driven shaft 6, rotates about fixed axis A and intermittently meshes with gear 2 which rotates about axis B-B. Flanges 4 are held tightly against the sides of gear 2 by spring 5 and can slide with gear 2 and its shaft along fixed guide a. Gear 2 meshes with reciprocating rack 1. Owing to the braking action of the flanges, gear 2 is shifted from one end of slot a to the other in each stroke of rack 1. When gear 2 is at the left-hand end of slot a (as shown), because rack 1 is travelling toward the left, it meshes with gear 3 rotating it clockwise. When the rack begins its return stroke to the right, gear 2 is shifted to the right-hand end of slot a and out of engagement with gear 3. Thus, driven shaft 6 has intermittent rotation, always in the same direction.
$2943$CxG,ML$