Continuous counterclockwise rotation of ratchet wheel 1, keyed to shaft 7, about fixed axis A, is converted into intermittent rotation through one full revolution at a time of disk 2 in the same direction and about the same axis. To start rotation of disk 2, latch 3 is turned clockwise so that it releases bar 4 which drops down and releases the lower end of pawl 5. This pawl is then turned by spring 6 into engagement with ratchet wheel 1. Since pawl 5 is pivoted on disk 2, the disk begins to rotate. Its rotation is restricted to one revolution by projecting lug a which engages the upper lug of bar 4 and lifts it so that latch 3 re-enters the notch in the bar. As disk 2 continues to rotate, the lower end of pawl 5 runs against the lower lug of bar 4 and is disengaged from ratchet wheel 1. Disk 2 then stops until latch 3 is turned again.
$2743$RG,D$