PRESENTATION ON:-

SINGLE NEEDLE LOCK SINGLE NEEDLE LOCK STITCH MACHINESTITCH MACHINE

SUBMITTED TO: MR. SHAKEEL IQBAL

PRESENTED BY: SUPRIYA NANDA VAISHNAVI SINGH MAHAK RAITANI SHIVANGI KEJRIWAL (FP- TECH, SEMESTER I)

A SEWING MACHINE is a textile machine used 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 sewing machine

• 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.

•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 uniforms for the French army.

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 and other such tools used in hand sewing ,automatically the process of stitching and saving time.

Types of SEWING MACHINES:

1.Lockstitch Machine

2.Chain Stitch Machine

3.Over Lock Machine

4.Cover stitch machine

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.

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 the needle. Meanwhile the lower thread is wound onto a bobbin, which is inserted into a case in the lower section of the machine below the material.

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.

Types of Types of Lockstitch Lockstitch machines:machines:

•Single needle lockstitch Machine• Double needle lockstitch Machine

SINGLE NEEDLE SINGLE NEEDLE LOCKSTITCH MACHINELOCKSTITCH MACHINE

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 garment sewing 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 stitch exotic shirts but also traditional dresses.

• Most common sewing machines are lockstitch machines. The lockstitch sewing machines have special technologies based on high speed lockstitch.

• It is mostly suitable for sewing shirts,trousers,jackets,suits,overcoats,children clothes and women undergarments.

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.

•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 for sewing turning, acute angle and direct stitch.

•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-trimming mechanism is introduced

MODEL: JUKI DDL-8500SEWING SPEED: max. 5000 spmSTITCH LENGTH: max.5mmPRESSURE FOOT LIFT by hand,max.5.5mm;by knee max.13mmNEEDLE BAR STROKE:30.7mmHOOK: auto-lubricating full rotary hook

THE DDL-9000 SERIES

• THE DDL-9000 Series Single-Needle Lockstitch Machines with automatic thread 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.

FEATURES OF SNLS FEATURES OF SNLS • The 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 offer extremely smooth and even stitching.

•The direct-drive motor system accounts for quiet sewing of slippery and stretch materials.

•A tension regulating knob with calibrations and presser spring regulator, as well as easy access maintenance capabilities.

•Operation and reduction in vibration levels.

•Other features include a large, easy to operate hand wheel, a micro-presser-lifter mechanism

PARTS OF A SNLS PARTS OF A SNLS MACHINE 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 holder•Bobbin case•Take-up lever•Bobbin•back- tack lever•Cloth feeder

•Motor

CONSTRUCTION AND CONSTRUCTION AND WORKING OF SNLS WORKING OF SNLS MACHINEMACHINE

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.

• 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.

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 passes through various thread guides.

•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 down with the help of cam and ensures smooth functioning of the machine.

•BACK TACK LEVER: this is a lever provided for a backward or 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.

•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.