Machine Ari

machine embroidery

How a Sewing Machine Makes a Chain Stitch

Unlike a lockstitch (which uses a bobbin and top thread), a chain stitch is formed by:

1. Single Thread Mechanism – The machine uses only one thread, which loops through the fabric and interlinks with itself.
2. Looper System – A looper hook catches the thread and pulls it back, creating a chain-like loop.
3. Continuous Stitch Formation – Each new stitch connects to the previous one, forming a flexible and stretchable seam.

Chain stitch embroidery by machine

Types of Chain Stitch Machines

1. Single-Thread Chain Stitch (Class 100)
• Basic chain stitch used for temporary stitching or basting.
• Not very secure; can unravel if the thread is pulled.
2. Double-Thread Chain Stitch (Class 400)
• Uses a needle thread and a looper thread for added strength.
• More secure than single-thread chain stitch.
3. Cover Stitch (Class 600)
• Used in hemming (common in T-shirts and sportswear).
• Forms multiple parallel rows of chain stitches with looper threads on the underside.

Chain stitch embroidery by machine

Advantages of Machine Chain Stitch

✔ Stretchability – Ideal for knit fabrics (e.g., T-shirts, leggings).
✔ Speed – Faster than lockstitch, good for high-production sewing.
✔ Decorative Uses – Used in embroidery and ornamental stitching.

Chain stitch embroidery by machine

Disadvantages

✖ Can Unravel – If the thread breaks, the entire seam may come undone (unless secured properly).
✖ Less Durable – Not as strong as a lockstitch for heavy-duty fabrics.

Common Applications

• Apparel: T-shirts, lingerie, sportswear (due to stretchability).
• Embroidery: Many embroidery machines use chain stitches for detailing.
• Industrial Sewing: Used in bag closing, button sewing, and serging.

·         Chain Stitch vs. Lockstitch

Feature	Chain Stitch	Lockstitch (Class 300)
Threads Used	1 or 2	2 (needle + bobbin)
Stretchability	High	Low
Security	Can unravel	More secure

Feature	Chain Stitch	Lockstitch (Class 300)
Threads Used	1 or 2	2 (needle + bobbin)
Stretchability	High	Low
Security	Can unravel	More secure