Then you need to sharpen the knife. The specific operation steps are to drop the knife halfway, remove all the screws that install the knife at shutdown, and then take out the handle of the knife to turn it up. After removing the screws, take the knife to the relevant sharpening place to sharpen the knife. Half of the sharpened knife is narrower than the original knife, so you need to lower the knife a bit, first put a piece of A4 paper under the knife, when the knife falls to the lower position, cut off the power and loosen the screw of the upper knife At the top of the knife holder, there are three knife adjustment screws. Take an internal hexagon and press down until the paper under the knife is cut through.