Three pin wheels, 1, 2 and 3, of equal pitch diameter and rigidly attached together, with pins a, rotate about fixed axis A and mesh with teeth d of sprockets 4, 5 and 6 which rotate about fixed axes B, C and D. Pin wheels 1, 2 and 3 have three, seven and nine pins, respectively. Each pin wheel has a concentric locking surface b, and sprockets 4, 5 and 6 have concave locking surfaces f, e and q. When driving pin wheels 1, 2 and 3 rotate continuously, driven sprockets 4, 5 and 6 rotate intermittently with dwells. During the dwells, locking surfaces b engage concave surfaces f, e and q to prevent unintentional rotation of the corresponding sprockets 4, 5 and 6. To each revolution of wheels 1, 2 and 3, sprockets 4, 5 and 6 turn through the angles ϕ₄=2π, ϕ₅=π and ϕ₆=(2/3)π. Sprockets 4, 5 and 6 rotate consecutively, not simultaneously. The profiles of teeth d of sprockets 4, 5 and 6 are along curves which are equidistant to an epicycloid of a circle. The direction of rotation of sprockets 4, 5 and 6 is opposite to that of wheels 1, 2 and 3.
$2613$PG,D$