EE ALLEGES THAT CO-WORKER ENGAGED EMER STOP ON CONVEYER BY ACCIDENT, WHERE UPON EE WALKED ON CONVEYER TO RESET EMER STOP, EE ALLEGES THAT CONVEYER STARTED UP AND HE WAS THROWN FROM HIS FEET IN TO GUARD ON BOX INTERSECTION. EE DID NOT DE-ENERGIZE EQUIPMENT BEOFRE RESETING.