chain stitch presentation

Mechanism of

Chain Stitch Machine

2

Presenter

Submitted To: Madam Shahzeen Arshed Ali

Presented By: Ch.Zain ul Abedin (10-TE-12) Ch. Sarmad Azeem (10-TE-01) Ch. Faizan Shafiq (10-TE-13) Ch. Muhammad Irfan (10-TE-21) Ch. Umer Farooq (10-TE-40)

Mechanism of Chain Stitch Machine3

Presentation lessons

1. Introduction

2. Draw Backs

3. Chain Stitch machines & Components

4. Chain stitch mechanism

5. Loop formation and working of Looper

6. Stitch Classes

7. Applications

8. Sewing Precautions


What is Chain stitch?

Passing of a loop of thread through another loop formed by the same thread is called chain stitch or Intralooping.


Chain stitch was used by early sewing machines and has 2 major drawbacks:

1.The stitch is not self-locking, and if the thread breaks at any point or isn't tied at both ends, the whole length of stitching comes out. It's also easily ripped out.

2.The direction of chain stitch is much difficult to change. It’s required experienced worker.

Mechanism of Chain Stitch Machine

Drawbacks of Chain Stitch

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Chain Stitch Machine Types

1.Single needle chain stitch machine

2.Double needle chain stitch machine

3.Multi needle chain stitch machine


Chain Stitch Machine Types

Double needle chain stitch machine

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Chain Stitch Machine Types Multi needle chain stitch machine• 4 needle double needle chain stitch machine• 12 needle double needle chain stitch machine• 33 needle double needle chain stitch machine

Multi needle chain stitch machine79

CHAIN STITCH MACHINE COMPONENTS

• Thread tension mechanism

• Thread tension Disk• Thread Guide • Thread take-up Lever



• Needle bar and lever Mechanism• Needle lever

• Needle Bar• Needle

• Feed Mechanism• Presser Foot• Feed Dog• Needle



• Loop Make Mechanism• Looper• Needle • Take-up Rod• Thread

• Presser Foot Mechanism• Presser Bar• Presser Screw• Lifter Lever Spring• Presser bar Lifter


Bed Types

The classification of sewing machine bed types is based on the manner in which:-

• The fabric travels with respect to the bed while being sewed

• The frame of the machine is constructed for mounting the machine.

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Bed Types

• Flat Bed

• Cylinder Bed

• Feed Off the Arm

14 Mechanism of Chain Stitch Machine14

THREADING & Feeding System

Threading of the machine is very important Incorrect threading may cause: Skip stitch Thread breakage Uneven stitch formation

Feeding System The material handling components of a machine are often referred

to as Feed System..• Presser Foot• Needle• Feed Dog


ADJUSTING THE STITCH FORMATION

Thread Tension adjustment• It can be adjusted by adjusting the mount tension devices on

the machine • ( The tension should be as light

as possible )

1. Turn Tension Adjustment Discs

clockwise (A) to increase thread

tension.

2. Turn Tension Adjustment Discs

counterclockwise (B) to decrease

thread tension.


Improve Stitches Quality against the Diagram:

1. Shows the Correct Stitch

2. The stitches are the too

Tight. Reduce the tension

by turning the Tension

Dial in counter clock

wise direction.

3. The Stitches are too

loose. Increase the tension

by turning the Tension Dial in

Clock wise direction.


Chain Stitch Machine Mechanism

Two Types of Chain Stitch Mechanism:

1.Gear Drive Chain Stitch Mechanism

2.Belt Drive Chain Stitch Mechanism


Gear Drive Chain Stitch Machine


Belt Drive Chain Stitch Machine & its Mechanism:


1. Parts moving with the help of Bottom shaft

2. Parts moving with the help of Crank shaft


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Loop formation and working of Looper :

Function of looper (intralooping):

1.Needle

2.Looper or hook

3.Thread

4.Presser Foot

5.Feed Dog


Chain Stitch Formation

The total operation of the 1 chain stitch is given into 8 steps.

Frame 1. Needle started

its stroke downward

And fabric moved.


Frame 2. Needle start penetrating

in the fabric and at the

same time looping hook

starting to release the

previous stitch thread.


Frame 3. Needle thread starting

to penetrate in the

looper hook.


Frame 4. Needle thread is

entering in the

Looper thread.


Frame 5. Looper hook is ready

to pick up the needle

thread.


Frame 6. Looper hook picked

the needle thread.


Frame 7. Needle is moving

upward.


3o

Frame 8. Looper hook is moving

forward to make a

Stitch.


Complete Video of a Chain Stitch


Comparison between Chain Stitch & lock Stitch:

• Chain stitch has more elasticity then lock stitch.• Chain stitch is thicker than lockstitch. • Chain stitch can easily be ripped then lock stitch.• Particular care is required in chain stitch to prevent

runback from the last stitch then lock stitch.• Chain stitch is made with looper instead Bobbin.• In Chain Stitch Thread consumption is more then

Lock Stitch.


There are 6 Main classes of Stitch….

• Class 100 - Single Threads Chain Stitch• Class 200 - Hand Stitch• Class 300 - Lock Stitch• Class 400 - Multi-thread Chain Stitch• Class 500 - Over-edge Chain Stitch• Class 600 - Covering Chains Stitch


Stitch Classes

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• Single thread Chain stitch, has a needle thread, and a blind looper.

• Has good extension, but unravels easily.


Class 100 - Single Threads Chain Stitch

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Class 400: Multi Thread Chain Stitch (formed with a single looper)

• Two thread chain stitch - one needle thread and one looper thread.

• The needle & under threads cross over on the underside of the fabric


L

N

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Formation of Multi Thread Chain Stitch


Class 500 : Over-edge Chain Stitch:

• This type of stitch is made with one needle thread and two looper threads.

• Has excellent extension and does not unravel easily.


N

L1

L2

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Class 600 - Covering Chains Stitch:

• Top and Bottom cover seam stitch, has 2 needle, 1 looper and 1 spreader thread.

• Has excellent extension, when a small stitch is used excellent seam cover is achieved


S

N1

N2

L

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APPLICATIONS

• Inseam of jeans, trousers• In Jackets seams• waist band attach (kansai Stitch)• Hemming• Attaching lining tapes• Feedo Tape Attach• For closing bags, button holes, bar tacks


Sewing Precautions:

• A chain stitch machine needs care for its smooth running.

• It should be cleaned and oiled regularly to ensure satisfactory sewing and long life.

• Use a small dry brush or old toothbrush and soft cloth to remove dust.

• When not in use, your machine should be covered with Machine Cover.


• If the machine is used everyday, oil it once a week.• Keep hands away from the needle when you turn

the power switch on, or while the machine is operating.

• Never leave the machine running and unattended.


Ciao……


chain stitch presentation

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