Crank 8 rotates about fixed axis A. Rocker arm 7 of four-bar linkage ABCD turns about fixed axis D. Bent lever 5 turns about fixed axis E. When crank 8 rotates about axis A, triple rocker arm 7 oscillates and, through connecting rod 6, it also oscillates bent lever 5. Link 4 is connected by a turning pair to link 7 and engages pins 3. Connected by turning pairs to bent lever 5 are pawl 2 which engages ratchet wheel 10 and pawl 1 which engages ratchet wheel 9. When lever 5 turns clockwise it turns ratchet wheel 10, and when it turns counterclockwise, it turns ratchet wheel 9. Wheel 9 has a rim along which link 4 slides. Mounted on the rim of wheel 9 are pins 3 which link 4 engages to impart supplementary motion to ratchet wheel 9.
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