Ratchet wheels 1 and 5 are rigidly attached together (or integral) and rotate about fixed axis A. Wheels 1 and 5 are rotated by pawls 3 and 4 which turn about fixed axes B and C. When pallet a of pawl 3 engages tooth b of wheel 1, the other leg d of pawl 3 lifts locking pawl 2 out of engagement. Pawl 2 turns about fixed axis D. After wheel 1 has been turned through a certain angle, pawl 3 is turned out of engagement and wheels 1 and 5 are locked again by pawl 2. Next, pawl 4 is turned by a separate drive so that its pallet e engages tooth f of wheel 5, and its other leg k lifts locking pawl 2 out of engagement. Oscillating pawls 3 and 4 alternately rotate wheels 1 and 5 intermittently clockwise.
$2729$RG,ML$