a protective cover device includes a supporting member secured to a worktable of a sawing machine , a cantilever having rear and front pivot ends pivoted to the supporting member and a cover shield by rear and front journal pins , respectively . at least one of the rear and front journal pins is movable relative to a corresponding one of the rear and front pivot ends between a latched position , where a respective one of the rear and front journal pins pivotally secures a corresponding one of the rear and front pivot ends to a corresponding one of the supporting member and the cover shield , and a released position , where the respective one of the rear and front journal pins is clear of the corresponding one of the supporting member and the front pivot end by being withdrawn therefrom .