Decide annular sword device

The utility model provides a decide annular sword device comprises knife rest, external diameter blade holder, internal diameter knife rest, blade, voussoir, adjusting screw, cheese head screw, little cheese head screw, cross countersunk screw, its characterized in that: the knife rest be that circular shape has a square groove to play the effect of transmitting power below, the external diameter blade holder on have an outer blade of screw hole installation, also there is screw hole installation inner blade on the internal diameter knife rest, the blade be that prism has a through -hole in the middle of and, the shape of voussoir is the wedge, adjusting screw play the regulating action to the voussoir, cheese head screw play the fastening effect, realize the fastening effect to the blade through the voussoir, little cheese head screw plays the positioning action to the voussoir, cross countersunk screw play the location regulating action to the blade.