Gear 6 rotates freely on shaft 1 about fixed axis A and meshes with gear 7 which rotates about fixed axis B and has one half as many teeth as gear 6. Sleeve 2 is keyed to shaft 1 and has sliding pawl 3 whose end a is forced by spring 5 into engagement with gear 6 so that the gear rotates together with sleeve 2 and shaft 1. Rigidly attached to the base is cam member 4 whose profiled working surface disengages pawl 3 from gear 6 after each half revolution of the gear. Thus, when shaft rotates continuously, gear 7 rotates intermittently with dwells. Owing to the tooth ratio of gears 6 and 7, the dwell and rotation periods of gear 7 are equal to each other and correspond to one half revolution of gear 6.
$3320$GrC,D$