The difference between a flat sewing machine and a sewing machine

Flat sewing machine is a specific type of sewing machine, mainly used for straight stitching. Sewing machines are a broader category that refers to all machines used for sewing materials.
Core Definition and Relationship
Sewing machine: Refers to all machines that sew fabrics, leather, and other materials together using stitching. It is a general term that covers various models with different functions, such as flat sewing machines, overlock sewing machines, overlock sewing machines, embroidery machines, etc. ‌
Flat sewing machine: It is the most basic and common type of sewing machine, also known as the "flatbed". It mainly uses single needle and thread stitching for straight stitching. ‌
Main functional differences
The function of a flat sewing machine is to perform straight stitching (flat sewing), which is used for the upper and lower splicing of fabrics. Some multifunctional home or computer sewing machines can also achieve simple zigzag stitching (simulating lockstithing) or decorative stitching, but their basic design still revolves around linear sewing. ‌‌
The functions of other sewing machines: Each type in the sewing machine family has its own expertise.
For example:
Overlock sewing machine (locking machine): specifically used for sewing and edging the edges of fabrics to prevent detachment. ‌‌
Stretching machine: commonly used for knitted fabrics, with good elasticity in the stitching.
Embroidery machines, locksmith machines, nail locking machines, etc. are specialized sewing machines used to complete specific processes. ‌