Crank 1 rotates about fixed axis A and is connected by turning pairs B to connecting rods 6 which, in turn, are connected by turning pairs C to sliders 5 moving along fixed guides b. Links 4 are connected by turning pairs C to sliders 5 and by turning pairs D to links 3. Links 3 turn about axis A independently of crank 1 and are connected by turning pairs D to pawls a which engage ratchet wheel 2. When crank 1 rotates about axis A, ratchet wheel 2 is turned intermittently clockwise about axis A.
$1821$LR,ML$