Design of a low cost hand operated yarn trimming device for conventional lock stitch machines

Abstract

Yarn trimming is' carried out by using a pair of scissors in conventional lock stitch machines. Three steps should be followed to trim the yarn. First, the presser foot is lifted by using the knee lifter (hand lifter in some household old lock stitch machines). Then the fabric is moved out and ultimately the yarn is trimmed using a pair of scissors. When the pair of scissor is used, it should be taken to hand and then trimming is done, which is a time consuming task.