Round eccentric 1 rotates about fixed axis A and is encircled by collar b of link 8. Bellcrank 2 turns about fixed axis C and is connected by turning pair B to link 8. When eccentric 1 rotates about axis A, pawl 3, connected by a turning pair to lever 2, turns ratchet wheel 4 intermittently counterclockwise about axis A. Spring 7 holds pawls 3 and 5 in engagement with wheel 4. Locking pawl 5 positively locks ratchet wheel 4 during the idle period. When pawl 3 begins to turn wheel 4, the upper end a of lever 2 engages flat spring 6, thereby lifting locking pawl 5 and allowing ratchet wheel 4 to turn.
$1810$LR,6L$