Rocker arm 3 of four-bar linkage ABCD is connected by turning pair E to slider 7 which moves along slot a of link 2. Link 2 slides in fixed guide p and has gear rack c which meshes with gear segment b of link 4. Link 4 turns about fixed axis F and is connected by turning pair G to pawl 5 which engages ratchet wheel 6. Ratchet wheel 6 rotates about axis F independently of link 4. When crank 1 rotates about fixed axis A, link 2 and rack c reciprocate while link 4 with gear segment b oscillate. At this, pawl 5 turns ratchet wheel 6 intermittently counterclockwise.
$1819$LR,ML$