Toothed pinion 1 is rigidly attached to the base. Rack 2 slides along guides B-B of carrier 3 which, in turn, rotates about fixed axis A. Angular velocity ω₂ of the rack equals angular velocity ω₃ of the carrier. The velocity of sliding motion of rack 2 in guides B-B is v=ω₂r₁ where r₁ is the pitch radius of pinion 1. The paths of the points of rack 2 are involutes of a circle of radius r₁.
$2307$SG,3L$