DEPARTMENT OF FDT
PROGRAM: BSC IN HON’S
COURSE CODE: AMT-204
COURSE TITLE: SEWING MACHINE & ENGINEERING ATTACHMENT
(SESSIONAL)
TEACHER NAME: GOLAM RABBANI
LECTURER OF SONARGAON UNIVERSITY
AMT&FDT
DATE-22/06/2020
STUDENT NAME: TURJOY SAHA
BATCH NAME : SATKANIA
STUDENT ID: FDT-1801012029
Assignment on parts & points of single needle lock stitch machine with its definition & picture
Features of Single Needle Lock Stitch Machine
Single needle lock stitch machine is called a plain needle sewing machine. Single needle lock stitch
machine is mostly used as an industrial sewing machine. Modern single needle lockstitch has a thread
trimmer which operates at the highest speed of its kind. Lockstitch machine is the most commonly used
sewing machine in the apparel industry, especially in woven garments. Here in this article, I am going to
share Features of Single Needle Lock Stitch Machine with you for a clear understanding of single needle
lock stitch sewing machine.
Types of Lock stitch Sewing Machine
There are two types of lock stitch sewing machine used in a garments factory.
1. Single needle lockstitch machine
2. Double (two) needle lockstitch machine
Single Needle Lock Stitch Machine
Single needle lock stitch machine is stitch by one needle of a machine by lock stitch.
Parts of Single Needle Lock Stitch Sewing Machine
Different Parts of Single Needle Lock Stitch Sewing Machine
1. Needle
2. Needle guard
3. Needle bar
4. Throat plate
5. Slide plate
6. Face plate
7. Feed dog
8. Thread take-up lever
9. Presser foot
10. Presser foot lifter (by hand)
11. Presser foot lifter (by knee)
12. Tension spring
13. Tension disc
14. Stitch (SPI) regulator.
15. Back stitch lever
16. Hand wheel
17. Bobbin thread winder
18. Bobbin
19. Bobbin case
20. Thread spool tray
21. Needle thread guide
Needle
a very fine slender piece of polished metal with a point at one end and a hole or eye for thread at the
other, used in sewing.
The Safety Needle Guard is a safety feature used during sewing. The metal guard is attached to the
presser foot bar so that any unintentional touching of the needle during sewing is prevented.
Needle bar
The needle bar is the long cylinder that holds your needle. Provided the needle is seated in it properly
(the needle is not backwards, not slightly rotated, and/or not fully inserted) this is the first check and
adjustment made before anything else.
Throat plate
A sewing machine throat plate is the metal plate beneath a sewing machine's needle and presser
foot. ... A throat plate has a second, larger opening (or two) that allows the sewing machine feed dogs
to emerge from below to grip the fabric and help move it forward as you sew
Face plate:
A cover which on removal gives access to the oiling points on the needle bar, presser bar and take-up
lever
Feed dog
A set of feed dogs typically resembles two or three short, thin metal bars, crosscut with diagonal teeth,
which move back and forth in slots in a sewing machine's needle plate. Their purpose is to pull ("feed")
the fabric through the machine, in discrete steps, in-between stitches
Thread take-up lever
The take-up lever is the metal lever (looks like a hook) that is on top of your machine and moves up and
down while you sew. This lever is what pulls the thread off the spool and helps supply an even feed of
thread to your needle.
Presser foot
A presser foot is an attachment used with sewing machines to hold fabric flat as it is fed through the
machine and stitched. ... Presser feet have two toes, one to hold the fabric down on either side of the
needle.
Presser foot lifter (by hand)
Abstract: A pressure foot lifter mechanism is installed as an attachment on any sewing machine. ... The
tube extends upwardly from the coil spring, then across the horizontal body of the machine, and then
downwardly to a hole in the table top of the machine. A washer or flange is placed over the hole in the
table top.
Presser foot lifter (by knee)
A pressure foot lifter mechanism is installed as an attachment on any sewing machine. In a preferred
embodiment, a clamp is attached to the presser foot lifter bar of a sewing machine, and a coil spring is
used to bias a cable attached to the clamp in a downward direction
Tension spring
Allows you to raise and lower the tension of both the top thread and the bobbin thread in your sewing
machine. The level of tension will determine how tight your stitches are
Tension disc
Tensions disks control the amount of pressure applied to the thread for an even feed to the machine
needle causing an evenly formed stitch. ... Always have the presser foot raised when threading the
sewing machine so that the disks are not engaged and are open to accepting the thread
Back stitch lever
The backstitch (sometimes called a staystitch because it keeps stitches from pulling out) is very useful
and also very simple. To do it, you press the reverse button or lever while you are stitching. Check your
manual on how to use your sewing machine's reverse function
Hand wheel
On most modern electric sewing machines the hand wheel (that “bump” on the right side of your
sewing machine) is turned toward you (counter-clockwise if you are looking at the machine from the
right side of your machine) to take a manual stitch
Bobbin thread winder
Bobbin Winder. ... A bobbin is the little mini-spool of thread that goes on the bottom of a sewing
machine, they can hold ~100 ft of standard thread. Often times a sewing machine comes with a bobbin
winding mechanism, so that you can wind bobbins as necessary.
Bobbin
A bobbin is a spindle or cylinder, with or without flanges, on which wire, yarn, thread or film is wound.
Bobbins are typically found in sewing machines, cameras, and within electronic equipment. In non-
electrical applications the bobbin is used for tidy storage without tangles.
Bobbin case
The purpose of the bobbin case is to support the bobbin in the sewing machine so that the machine
stitches can be formed. If the bobbin case becomes damaged in any way the machine stitch will not
form correctly. A bobbin case is made to a required size and set of specifications for a particular sewing
machine.
Thread spool tray
Boxes or bins with small compartments or separators are also great for storing thread. Using a special
thread rack with pins for the spools of thread, or creating your own rack by adding pins to a pegboard
are also good ways to keep your threads tangle-free. Keep thread ends tucked neatly away when
storing thread.
Needle thread guide
A needle bar thread guide for a sewing machine includes a thread guide body mounted on a needle bar
and having a threading portion for threading the sewing machine, an introducing portion formed on the
thread guide body for introducing a needle thread to the threading portion, and a fall-off preventing
member disposed.
Features of single needle lock stitch sewing machine:
1. Lock stitch is formed by single needle of a plain sewing machine.
2. The speed of a lock stitch sewing is up to 6000 rpm.
3. During stitch formation; the needle thread is interlaced with the bobbin thread by means
of a hook.
4. Lock stitch machine can be distinguished by the winding device provided for bobbin
thread.
5. Programmable plain sewing machine is used for few respective operation.
