Disk 1 rotates clockwise about fixed axis A. Lever 2 oscillates about fixed axis B and has internal cam surface b along which pin a of disk 1 slides. Lever 2 has a lug with axis C about which pawl 3 turns. Pawl 3 engages the teeth of ratchet wheel 4 which rotates freely about axis B. When disk 1 rotates, its pin a engages the shoulder in cam surface b, turning lever 2 counterclockwise until a point is reached where pin a passes over the shoulder. Thus lever 2 oscillates and pawl 3 turns ratchet wheel 4 intermittently with dwells. Pawl 3 is held in contact with wheel 4 by spring 5.
$3344$CR,ML$