Gears 1 and 2 rotate about fixed axes A and B. When driving gear 1 rotates continuously clockwise, driven gear 2 rotates intermittently with dwells. Concentric locking surfaces a of gear 1 engage concave surfaces b of gear 2 to avoid unintentional rotation of gear 2 during its dwell periods. Due to the symmetrical arrangement of the teeth and locking features, gear 2 has uniform intermittent motion when gear 1 rotates at uniform velocity. To each revolution of gear 1, gear 2 has two periods of motion and two dwells.
$2364$SG,D$