Chain Stitch Presentation
description
Transcript of Chain Stitch Presentation
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Mechanism of
Chain Stitch Machine
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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
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What is Chain stitch?
Passing of a loop of thread through another loop formed by the same thread is called chain stitch or Intralooping.
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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
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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
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CHAIN STITCH MACHINE COMPONENTS
• Needle bar and lever Mechanism• Needle lever
• Needle Bar• Needle
• Feed Mechanism• Presser Foot• Feed Dog• Needle
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CHAIN STITCH MACHINE COMPONENTS
• Loop Make Mechanism• Looper• Needle • Take-up Rod• Thread
• Presser Foot Mechanism• Presser Bar• Presser Screw• Lifter Lever Spring• Presser bar Lifter
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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
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CHAIN STITCH MACHINE COMPONENTS
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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
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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.
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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.
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Chain Stitch Machine Mechanism
Two Types of Chain Stitch Mechanism:
1.Gear Drive Chain Stitch Mechanism
2.Belt Drive Chain Stitch Mechanism
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Gear Drive Chain Stitch Machine
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Belt Drive Chain Stitch Machine & its Mechanism:
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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
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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.
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Frame 2. Needle start penetrating
in the fabric and at the
same time looping hook
starting to release the
previous stitch thread.
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Frame 3. Needle thread starting
to penetrate in the
looper hook.
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Frame 4. Needle thread is
entering in the
Looper thread.
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Frame 5. Looper hook is ready
to pick up the needle
thread.
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Frame 6. Looper hook picked
the needle thread.
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Frame 7. Needle is moving
upward.
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Frame 8. Looper hook is moving
forward to make a
Stitch.
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Complete Video of a Chain Stitch
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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.
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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
Mechanism of Chain Stitch Machine
Stitch Classes
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• Single thread Chain stitch, has a needle thread, and a blind looper.
• Has good extension, but unravels easily.
Mechanism of Chain Stitch Machine
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
Mechanism of Chain Stitch Machine
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Formation of Multi Thread Chain Stitch
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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.
Mechanism of Chain Stitch Machine
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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
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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
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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.
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• 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.
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Ciao……
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