An overlock sewing machine (often called a serger) is a specialized sewing machine designed to sew, trim, and finish fabric edges in one fast operation.
What an Overlock Machine Does
An overlock machine:
Uses multiple threads (usually 3–5)
Forms stitches around the edge of fabric
Cuts excess seam allowance with a built-in blade
Prevents fabric from fraying
Creates strong, stretchy seams
Main Features
Very high sewing speed
Built-in cutting knife
Loopers instead of a standard bobbin
Produces professional-looking seam finishes
Works especially well on knit and stretch fabrics
Common Uses
Finishing garment edges
Sewing T-shirts and sportswear
Making rolled hems