Principle of Chain Stitch Formation

• Chain stitch is made by using one or more group of threads.

• The stitch which is formed by two or more group of threads is called multi thread chain stitch.

• In this stitch, the loop of one group threads is bounded by interlooping with loop of another group of threads.

Interlooping two types of threads to form chain stitch

Stitch type -401 is multithread chain stitch and the followings are the steps referred as the principle

of stitch type-401 formation: Step-1

• Needle is entered through the fabric with the thread & reaches to it’s lowest position.

• Needle rises to form loop and looper starts forward.• A new loop is formed when needle moves upward a

little. • Looper enters needle thread loop.

Fig : Step-1

Step-2

• Needle rises and looper passes fully into loop. New loop is caught by the looper (above the needle eye below the old loop).

• Feed moves material to the next stitch position and looper swings to other side of needle with avoiding motion.

• Needle descends through triangle.

• Interlacement is occurred under the fabric (between the new loop & old loop).

• In that time fabric is also moved one stitch forward, due to feed dog mechanism.

Principle of Chain Stitch Formation

Fig : Step-2

Step-3

• The looper enlarges the new loop. So that the needle again entered through the fabric, it passes through the loop.

• Needle continues rise and looper starts its return stroke.

• The looper leaves the loop, which held on the needle blade. This loop now becomes the old loop.

Principle of Chain Stitch Formation

Fig : Step-3

Thanks to All

Thanks to All