elements of technology - copy

8/4/2019 Elements of Technology - Copy

1/25

PRESENTATION ON:-

SINGLESINGLE

NEEDLENEEDLE LOCKLOCK STITCHSTITCH

MACHINEMACHINE

SUBMITTED TO:

MR. SHAKEEL IQBAL

PRESENTED BY:

SUPRIYA NANDA

VAISHNAVI SINGH

MAHAK RAITANI

SHIVANGI KEJRIWAL

(FP-TECH, SEMESTER I)


2/25

A SEWING MACHINE is a textile machineused to stitch fabric or other material

together with thread. It is a machine with a

mechanically driven needle used for sewing

and stitching.

History and development of sewingmachine

sewing machines were invented during

the first Industrial Revolution to decrease

the amount of manual sewing work

performed in clothing companies.

The invention of the first sewing machine

was done by Englishmen THOMAS SAINT

In 1790.


3/25

Since the sewing machine has vastly improved the efficiency and

productivity of fabric and clothing industries.

In 1814 an Austrian tailor, JOSEPH MADEERSPER presented his first

sewing machine ,the development of which started in 1807.

In 1830 a French tailor, BARTHLEMY THIOMONNIER, patented a sewing

machine that sewed straight seams using chain stitch.

By 1841,THIOMONNIER had a factory of 80 machines sewing uniformsfor the French army.


4/25

Modern sewing machines are designed in such a way that the fabric easily

glides in and out of the machine without the hassle of needles and thimbles andother such tools used in hand sewing ,automatically the process of stitching and

saving time.


5/25

Types of

SEWING MACHINES:

1. Lockstitch Machine

2.Chain Stitch Machine

3.Over Lock Machine

4.Cover stitch machine


6/25

A lockstitch is the most common mechanical stitch made by a

sewing machine. The term "single needle stitching", often found on

dress shirt labels, refers to lockstitch.


7/25

The lockstitch uses two threads, an upper and a lower. Lockstitch is so named

because the two threads, upper and lower, "lock" (entwine) together in the

hole in the fabric which they pass through. The upper thread runs from a

spool kept on a spindle on top of or next to the machine, through a tension

mechanism, through the take-up arm, and finally through the hole in theneedle. Meanwhile the lower thread is wound onto abobbin, which is

inserted into a case in the lower section of the machine below the material.


8/25

To make one stitch, the machine

lowers the threaded needle through

the cloth into the bobbin area,where a rotating hook (or other

hooking mechanism) catches the

upper thread at the point just after it

goes through the needle. The hook

mechanism carries the upper thread

entirely around the bobbin case, so

that it has made one wrap of the

bobbin thread. Then the take-up arm

pulls the excess upper thread (from

the bobbin area) back to the top,

forming the lockstitch. Then the

feed dogs pull the material along

one stitch length, and the cycle

repeats.


9/25

Types of LockstitchTypes of Lockstitch

machines:machines:

Single needle lockstitch

Machine

Double needlelockstitch Machine


10/25

SINGLE NEEDLE LOCKSTITCHSINGLE NEEDLE LOCKSTITCH

MACHINEMACHINE

Single needle lockstitch machine is a

simple and the most common sewing

machine used for shirts and other

garments which require flawless stitches

on seems and hemlines. This garmentsewing machine is robust, sturdy and

requires low maintenance. Due to their

specific features, they are an

indispensable part of the textile

industry. These efficient machines are

highly reliable and they not only stitchexotic shirts but also traditional dresses.


11/25

Most common sewing machines are

lockstitch machines. The lockstitch sewingmachines have special technologies based on

high speed lockstitch.

It is mostly suitable for sewing

shirts,trousers,jackets,suits,overcoats,children

clothes and women undergarments.


12/25

CHARACTERISTICS OF SINGLE NEEDLE

LOCKSTITCH MACHINES

It creates less noise as compared to other

machines.

Synchronic feed of the needle bar and feed dog to

avoid distraction. Steady and beautiful in stitch,

free adjusting available.


13/25

It has fast speed, steady and enduring especially

when sewing jeans and decorative parts.

Adopt inside oil line box to release cycling oil

supply.

Single needle bar discrete design, easy forsewing turning, acute angle and direct stitch.


14/25

A thread tension regulator is provided for

adjusting the tension of the thread.

New wire type needle bar thread guide and

material friendly micro lifters are present.

The increased distance from the machine arm

to the needle promises enhanced workability.

New highly reliable thread-trimmingmechanism is introduced


15/25

MODEL: JULI DDL-8500SEWING SPEED: max. 5000

spam

STITCH LENGTH: max.5mm

PRESSURE FOOT LIFT by

hand,max.5.5mm;by knee

max.13mmNEEDLE BAR

STROKE:30.7mm

HOOK: auto-lubricating full

rotary hook


16/25

THE DDL-9000 SERIES

THE DDL-9000 Series Single-

Needle Lockstitch Machines with

automatic three trimming, available in

two models.

the DDL-9000D is a dry head

machine designed without an oil pan,eliminating the need for lubrication

and oil stains on fabric.

The DDL-9000s is a semi lubricating model which feeds clean

oil to the hook and needle bar only, greatly reducing maintenance.

It comes with table,stand,servo, controller and foot lifter.


17/25

FEATURES OF SNLSFEATURES OF SNLSThe machine arm is long and high, providing a wider

work space for easy material handling , as well as

increased view of the needle entry area.

Features include higher presser foot lift up to

15mm,stitch length up to 5mm,push-type reverse feed

switch and horizontal thread trimming system.

The newly designed feed and presser mechanism offerextremely smooth and even stitching.


18/25

The direct-drive motor system accounts for quiet forsewing slippery and stretch materials.

A tension regulating knob with calibrations and presser

spring regulator, as well as easy access maintenancecapabilities.

Operation and reduction in vibration levels.

Other features include a large, easy to operate hand wheel,

a micro-presser-lifter mechanism


19/25

PARTS OF A SNLS MACHINEPARTS OF A SNLS MACHINE

Bed slide

Face plate or cover plate

Main shaft

Hook shuttle feeding shaft

Pressure foot cork sheet

Needle bar

Thread stand

Thread guide

Thread

check spring

Bobbin case

holderBobbin case

Take-up lever

Bobbin

back- tack leverCloth feeder

Motor


20/25

CONSTRUCTION AND WORKING OFCONSTRUCTION AND WORKING OF

SNLS MACHINESNLS MACHINE

BODY(moulded hollow block )

FACE PLATE OR COVER PLATE : a covering to

the internal parts and prevents the leakage of oils

also.

CORK SHEET : it is for sealing the leakage of oil.

MAIN SHAFT : it is welded shaft to the machine,has a cam, 2 bevel gears. Two connecting rods or

feeding shafts are placed below it.


21/25

CONNECTING RODS : there are two connecting rods

used for changing the alignment.

HOOK SHUTTLE FEEDING SHAFT : this is the shaft

connected to the main shaft with the help of two bevel

gears.

BED SLIDE : it is the flat base of the machine where the

cloth is placed.

PRESSURE FOOT : it is a flat foot like structure that

helps prevent the irregular and multi-directional

movement of fabrics.


22/25

THE THREADING SYSTEM

NEEDLE BAR : the part where the needle is fixed.

THREAD STAND : the stand for thread placement.

These are two in number as two different threads are

required for this machine.

THREAD GUIDE: there are two thread in this machine

which are guided from outside only. One for bobbin and

other for the needle. The bobbin thread guide is a simple

way on the bed of machine while the needle thread passesthrough various thread guides.


23/25

THREAD CHECK SPRING: it is also a type of thread guide.

It prevents the thread from unwinding from the thread guide.

TAKE-UP LEVER: it is a thread that moves up and downwith the help of cam and ensures smooth functioning of the

machine.

BACK TACK LEVER: this is a lever provided for a backwardor reverse stitching.

CLOTH FEEDER: the teeth like structure present on the

bed slide, moves with the help of spur gear and help the cloth

move smoothly forward or backward for stitching.


24/25

MOTOR: a motor of 220 V is used.

OIL LUBRICATING SYSTEM: the oil is present in a

tank . There is a oil lubricating pump connected with

hook shuttle which is connected to the main shaft for oil

sealing a cover plate and a face plate is used.


25/25

elements of technology - copy

Documents