edit: I was wrong
It is pretty simple though.. The gear retards the engagement of the disconnector for 4 out of the 6 teeth on the gear (groups of 2 hi teeth, followed by a deep "stop gap") by pushing on the front claw of the disconnector. The other 2 positions ("stop gaps") allow the disconnector to be rocked into a position that allows it to grab the hammer. While the disconnector is being restrained by these teeth, the autosear is managing the release of the hammer independantly.