The document summarizes the parts and functions of a lock stitch sewing machine. It describes the upper parts which include the head, arm, and bed. The lower parts include the band wheel, treadle, and legs. Key functions are also outlined, such as the needle bar holding the needle, presser foot holding fabric, and feed dog moving the fabric. The bobbin, shuttle, and bobbin case are also explained as being important parts that work together under the bed.

1. HE 211- Advanced Garments and Fashion Technology
PARTS AND FUNCTIONS OF
LOCK STITCH SEWING MACHINE
Reporters:
John Lenon L. Mendoza
Mea Jean I. Caminoy

2. Sewing machine
• A sewing machine is a machine which
is mechanically driven needle used to
stitch materials together with thread.
It is designed to join pieces of fabric
or leather by means of either a
lockstitch or a chain stitch.

3. Sewing machine
• Sewing machine makes a basic running
stitch the same way, with two sources
of thread. The top needle takes the
thread down into the fabric. It is caught
and looped via the bobbin apparatus and
then pulled back up. The ‘‘feed dog’’ moves
it along and the next stitch begins. Every
operation is continued again and again.
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4. Parts of sewing machine
and their functions:
There are two major parts of the
sewing machine. One is upper part and
other is lower parts. The upper part
contains of Head, Arm and Bed. The
lower part contains of Band Wheel,
Band Wheel Crank, Pitman Rod, Belt
Guide, Belt Shifter, Dress Guard,
Treadle, Legs.

5. Upper parts of
sewing machine
and their function

8. Upper parts of sewing machine and their
function
The Upper Parts is composed of:
• 1. Head is the complete sewing machine without a
cabinet or stand.

9. Upper parts of sewing machine and their
function
The Upper Parts is composed of:
• 2. Arm is the curve part of the head containing
mechanism for operating the needle.

10. Upper parts of sewing machine and their
function
The Upper Parts is composed of:
• 3. Bed is the flat portion of the machine and beneath is the
feed dog where it is mounted, and the shuttle and lower
thread are placed.

11. Parts of the Sewing Machine in
the Arm
• 1. Spool Pin is the thread holder.

12. Parts of the Sewing Machine in
the Arm
• 2. Thread Guide keeps the thread in
position.

13. Parts of the Sewing Machine in
the Arm
• Thread Take up Lever releases the thread
and interlocks with the bobbin thread.

14. Parts of the Sewing Machine in
the Arm
• 4. Presser bar lifter moves the presser
foot.

15. Parts of the Sewing Machine in
the Arm
• 5. Tension controls the looseness and
tightness of stitches.

16. Parts of the Sewing Machine in
the Arm
• 6. Needle Bar holds the needle in place.

17. Parts of the Sewing Machine in
the Arm
• 7. Needle Clamp holds and tightens the needle.

18. Parts of the Sewing Machine in
the Arm
• 8. Presser Foot holds the fabric in place while
sewing.

19. Parts of the Sewing Machine in
the Arm
• 9. Needle is a slender tool attached in the needle
clamp used for sewing.

20. Parts of the Sewing Machine in
the Arm
• 10. Bobbin Winder controls the bobbin while
winding thread.

21. Parts of the Sewing Machine in
the Arm
• 11. Stitch regulator checks the length of the
stitches.

22. Parts of the Sewing Machine in
the Arm
• 12. Balance Wheel sets the mechanism in
motion.

23. Parts of the Sewing Machine in
the Arm
• 13. Belt connects the balance wheel to the drive
wheel.

24. Parts of the Sewing Machine in
the Arm
• 14. Stop Motion Screw hinders moving when
loosened and starts

25. Parts of Sewing
Machine under
the Bed

26. Parts of Sewing Machine under
the Bed
• 1. Feed Dog moves the fabric while sewing.

27. Parts of Sewing Machine under
the Bed
• 2. Throat plate is the windows of the feed dog
and it is where the bobbin threads come out.

28. Parts of Sewing Machine under
the Bed
• 3. Slide plate is a movable plate that covers the
shuttle and bobbin case.

29. Parts of Sewing Machine under
the Bed
• 4. Shuttle holds the bobbin case while sewing.

30. Parts of Sewing Machine under
the Bed
• 4. Shuttle holds the bobbin case while sewing.

31. Parts of Sewing Machine under
the Bed
• 5. Bobbin is a metal spool for winding thread.

32. Parts of Sewing Machine under
the Bed
• 6. Bobbin Case holds the bobbin.

33. The Lower Parts of
the Lock Stitch
Sewing Machine

34. The Lower Parts of the
Lock Stitch Sewing Machine
The lower parts of the sewing machine
are the cabinet and the stand. The
cabinet has drawers and screw on the
hinges for the attachment of the head.

35. The Lower Parts of the Lock Stitch
Sewing Machine
1. Band Wheel leads the balance wheel
through the belt connection.

36. The Lower Parts of the Lock Stitch
Sewing Machine
• 2. Band Wheel Crank moves the band
wheel.

37. The Lower Parts of the Lock Stitch
Sewing Machine
• 3. Pitman Rod holds the treadle to band
wheel crank.

38. The Lower Parts of the Lock Stitch
Sewing Machine
• 4. Belt Guide holds the belt to its place.

39. The Lower Parts of the Lock Stitch
Sewing Machine
• 5. Belt Shifter removes the belt from the
wheel.

40. The Lower Parts of the Lock Stitch
Sewing Machine
• 6. Dress Guard protects the dress from the
wheel.

41. The Lower Parts of the Lock Stitch
Sewing Machine
• 7. Treadle is where the feet are stationed to
drive the band wheel through the pitman
rod.

42. The Lower Parts of the Lock Stitch
Sewing Machine
• 8. Legs support the cabinet of the machine.

43. The Lower Parts of the Lock Stitch
Sewing Machine
• 9. Cabinet holds the head of the machine by
interlocking screw on the hinges.