Powered, undirectional output controlling apparatus

A powered, unidirectional output controlling apparatus for mounting between a main shaft of an electrically powered tool and a power source thereof, characterized in that the apparatus comprises a rotating seat, a pair of flexible disc seats made from a rubber material, a locking seat, a plurality of locking rollers and a fixing ring, one end of said rotating seat being engaged with an output of a power transmission mechanism of the power source, an opposing end of said rotating seat being provided with a plurality of insertion shafts passing through said locking seat fastened by said pair of flexible disc seats, said locking seat being mounted into said fixing ring, said rotating seat having a centrally disposed bolt hole for mounting a main shaft of an electrically powered tool therein, said fixing ring having an external edge portion secured to a housing of the electrically powered tool, said locking seat having a perimeter portion provided with a plurality of locking slots formed therein, each of said locking slots having a flat bottom surface, said plurality of locking rollers being respectively disposed in said plurality of locking slots, whereby during manual application of torque to the housing of the electrically powered tool, said flat bottom surfaces of said locking slots respectively push said locking rollers to engage with a narrow space at a lateral end of said locking slots such that said locking rollers engage with said fixing ring and said locking seat.