Drum 4 rotates about fixed axis A. Driving link 1 reciprocates in fixed guide B and is connected by turning pairs E to links 8 and 10 which, in turn, are connected by turning pairs C and D to links 7 and 9. Links 7 and 9 turn about axis A and are connected by turning pairs F and K to pawls 2 and 3. The dimensions of the links comply with the condition: A͞D=D͞E=E͞C=C͞A. Pawls 2 and 3 are held in contact with the inside surface of drum 4 by springs 5 and 6. When link 1 reciprocates, pawls 2 and 3 alternately engage drum 4 and rotate it counterclockwise.
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