Pin wheel 1 with pins a rotates about fixed axis A and alternately meshes with the lower and upper parts of complex rack 2 which has teeth b and straight and semicircular portions. Rack 2 travels between guide rollers 3. When driving pin wheel 1 rotates continuously in one direction at uniform velocity, driven rack 2 reciprocates at uniform velocity while pins a mesh with teeth b, and at nonuniform velocity according to a sine law while pins a mesh with elongated teeth c.
$2581$PG,3L$