The Upper Looper is a metal arm-like part in an industrial overlocker (serger) machine that plays a vital role in forming overlock stitches. It works in conjunction with the lower looper and needles to create durable, professional-looking seams-especially on knit, stretchy, or woven fabrics.

Function: The upper looper carries one of the threads and swings in a timed motion to interlock threads from the needle(s) and lower looper. This action forms the characteristic looped edge that prevents fabric from fraying.
Material: Typically made of hardened stainless steel for durability and precision.
Compatibility: Designed for specific industrial overlocker models-each machine might require a differently shaped or sized upper looper.
Positioning: Located above the fabric path, moving side-to-side and slightly up-and-down as part of the stitch formation cycle.

Industrial Overlocker Upper Looper