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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)
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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.
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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.
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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.
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Types of
SEWING MACHINES:
1. Lockstitch Machine
2.Chain Stitch Machine
3.Over Lock Machine
4.Cover stitch machine
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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.
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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.
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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.
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Types of LockstitchTypes of Lockstitch
machines:machines:
Single needle lockstitch
Machine
Double needlelockstitch Machine
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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.
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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.
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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.
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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.
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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
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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
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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.
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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.
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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
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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
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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.
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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.
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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.
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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.
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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.
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