Crank 1 rotates about fixed axis A and is connected by turning pair B to slider 5 which moves along slot a of link 2. Link 2 slides along fixed guide p and is connected by turning pair C to pawl 3. Pawl 3 engages ratchet-tooth rack 4 which slides along fixed guide g. When crank 1 rotates about axis A, slotted link 2 reciprocates and pawl 3 moves rack 4 intermittently.
$1813$LR,6L$