Looper thread take-up apparatus externally added to outer end of lower driving shaft of a sewing machine

摘要

A looper thread take-up apparatus externally added to outer end of lower driving shaft of a sewing machine. A thread guide structure and a looper thread tension adjustment structure are mounted on outer face of the housing of the sewing machine and are adjacent to the outer end of the lower driving shaft of the sewing machine. The thread take-up cam is detachably disposed at the outer end of the lower driving shaft and rotatable along therewith. In case the looper thread breaks and tangles with the thread take-up cam, the thread take-up cam can be directly detached from the outer end of the lower driving shaft so that it is easy and convenient to clear up the tangling thread from outer side of the sewing machine.