The serger's knives are found in the section of the machine that cuts the material as it passes through the needle. As a result, the knives are able to match the overcast stitch, resulting in a totally encased edge.
What are the Functions of Sewing Machine Knives?
Even before the stitches are made, the serger sewing machines' knives can trim the fabric! They contribute significantly to the tidy, polished appearance of your edges. The majority of serger manufacturers follow the same design principles. You should try it out on a couple pieces of test fabric before using it for your first sewing job. Continue to modify the sewing machine knives' blade width. Do this until you've found a setting that gives you the look you want.