Sewing Mechanism : How Sewing Machine Work

How Stitches are formed in a Sewing Machine?
The 3 main key mechanisms to form a stitch in a sewing machine are:
  • Needle Mechanism
  • Bobbin & Shuttle Mechanism
  • Feed Dog Mechanism

These 3 mechanisms are carefully coordinated so that the machine can make perfect equal sized stitches. The top thread i.e. the needle thread pokes through the eye of the needle while the bottom thread i.e. the bobbin thread is fed from the bobbin. While stitching, the up and down movement of the needle and the rotation of the hook ring, the upper and lower threads are looped together to form the stitch.

Stitch Mechanism Step 1 Stitch Mechanism Step 2 Stitch Mechanism Step 3 Stitch Mechanism Step 4

Stitch Mechanism

Stitch
Loop or loops of one or more threads when bounds with each other by interlacing, inter looping, intra looping or combination of these, while sewing a fabric is called stitch.

Stitch types and Classification

Stitch Type - Class 100 and 200 Stitch Type - Class 300 and 400 Stitch Type - Class 500 and 600

Feed Mechanism

Feed mechanism is defined as the process by which the fabric is moved forward in the feeding zone of the sewing machine. Different types of feed mechanism in sewing machine are
Looper
An overlock sewing machine differs from a lock stitch sewing machine in which it uses loopers fed by multiple thread cones rather than a bobbin. Loopers serve to create thread loops that pass from the needle thread to the edges of the fabric so that edges of the fabric are suppressed within the seam. Sergers use looper threads instead of a bobbin thread.
Sewing Machine Needle Types
Different types of needles are used in sewing machines. Using a wrong type of needle can lead to needle breakage, difficulty in working with a chosen fabric and poor stitch quality.
There are different types of needles, they are:
Needle Types & Sizes with their Color Codes
Needle Type and Size Chart
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