Pin wheel 1 rotates about fixed axis A and its pins a mesh with teeth d of rack 2 which slides along fixed guides b-b. The profiles of teeth d of rack 2 consist of two semicircles. When driving pin wheel 1 rotates continuously at uniform velocity, driven rack 2 travels intermittently with dwells at nonuniform velocity. Impacts occur when pins a come into engagement with teeth d of rack 2.
$2606$PG,D$