Abstract: Safety contrivance for bag sealer is provided, including a pair of specially designed terminal brackets mounted on opposite ends of an upper jaw of the bag sealer. The terminal bracket has an angular slot, including a vertical and a horizontal slot sections, right down the middle to create a three dimensional space in the bracket and two identical halves on the right and left sides, with a slot depth greater than the vertical length of the trimmer, so that the trimmer can be completely concealed in the bracket enclosure to prevent possible infliction of cuts or more serious body injuries even if the operator's hand is in contact with the cutting edge of the trimmer blade accidentally.