This document provides information about the parts of a lockstitch sewing machine. It discusses the upper and lower parts of the machine. The upper parts include the head, arm, and bed. Key components described include the spool pin, thread guide, tension disc, needle clamp, presser foot, and feed dog. The lower parts include the bobbin, bobbin case, and shuttle. Additional parts like the balance wheel, stitch regulator, and treadle are also outlined. Diagrams are included to label and illustrate the various parts.

1. SEWING TOOLS
AND EQUIPMENTS
PARTS OF A LOCKSTITCH SEWING MACHINE
The Upper Parts

2. REVIEW/QUIZ: IDENTIFY WHAT TYPE OF SEWING MACHINE ARE SHOWN
1 2 3
A. Bartacking machine
B. Button Holer machine E. Button Attachment Machine
C. Embroidery Machine F. Double Needle Machine
D. Hi-Speed Lockstitch Machine G. Lockstitch Machine
H. Over Edging Machine

3. 4 5 6
A. Bartacking machine
B. Button Holer machine E. Button Attachment Machine
C. Embroidery Machine F. Double Needle Machine
D. Hi-Speed Lockstitch Machine G. Lockstitch Machine
H. Over Edging Machine

4. 7 8
A. Bartacking machine
B. Button Holer machine E. Button Attachment Machine
C. Embroidery Machine F. Double Needle Machine
D. Hi-Speed Lockstitch Machine G. Lockstitch Machine
H. Over Edging Machine

5. DESCRPTION TYPE
1. Used in making button holes on garments A. Bartacking machine
2. Domestic sewing machine B. Button Holer machine
3. Industrial sewing machine C. Embroidery Machine
4. Operated by foot. D. Hi-Speed Lockstitch Machine
5. Used in making fancy stitches on fabrics E. Button Attachment Machine
6. Used for reinforcing the opening and closing of pockets F. Double Needle Machine
7. Small machine G. Lockstitch Machine
8. Used in attaching buttons on garments H. Over Edging Machine
9. Used in construction of different clothing especially for the
inseam, out seam, and side seam
10. May also be converted electric power machine.
11. It has an automatic lubrication.
12. Finishes the raw edges of the pattern construction.

6. A. BALANCE
WHEEL
B. STITCH
REGULATOR
C. NEEDLE
CLAMP
D. THREAD
GUIDE
E. SPOOL PIN
F. THROAT
PLATE
G. SLIDE PLATE
H. BOBBIN
WINDER
I. FACE PLATE
J. FEED DOG
K. THREAD TAKE UP LEVER M. PRESSER BAR/PRESSER FOOT LIFTER
L. TENSION DISC N. SPOOL PIN FOR BOBBIN WINDDING
O. PRESSER FOOT

7. DESCRIPTION PARTS
1. releases the thread and interlocks with the bobbin
thread.
A. TENSION DISC
2. moves the presser foot. B. PRESSER FOOT
3. keeps the thread in position C. THREAD GUIDE
4. holds the fabric in place while sewing. D. PRESSER BAR LIFTER
5. controls the looseness and tightness of stitches. E. NEEDLE CLAMP
6. holds the needle in place F. SPOOL PIN
7. is the thread holder G. STITCH REGULATOR
8. controls the bobbin while winding thread. H. BALANCE WHEEL
9. checks the length of the stitches. I. BOBBIN WINDER
10. sets the mechanism in motion. J. THREAD TAKE UP LEVER

8. 1. Spool Pin
2. Thread Guide
3. Tension disc
4. Thread take up lever
9. Stitch regulator
16. Face Plate
11. Balance
wheel
8. Presser bar or
Presser foot lifter
7. Presser Foot
13. Slide plate
15. Feed dog
5. Needle clamp or Needle bar
14. Throat plate
10. Bobbin
winder
17. Spool pin for
bobbin winding

14. TWO MAJOR PARTS OF THE
LOCKSTITCH SEWING MACHINE
The two major parts of the lock
stitch sewing machine are the upper
and lower parts.

15. Upper Part
Lower Part

16. The Upper Parts is composed of:
1. Head is the complete sewing
machine without a
cabinet or stand.
2. Arm is the curve part of the head
containing
mechanism for operating the needle.
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.

17. ARM
HEAD
BED

18. 1. Spool Pin- is
the thread holder.
2. Thread Guide-keeps
the thread in position

19. 3. Tension disc-
controls the
looseness and
tightness of
stitches.
4. Thread Take up Lever -releases the
thread and interlocks with the bobbin
thread.

20. 5. Needle Clamp holds
and tightens the needle.
Needle Bar holds the needle in place.

21. 7. Presser Foot
holds the fabric in
place while sewing
8. Presser bar/foot lifter
moves the presser foot.

22. 9. Stitch regulator checks
the length of the stitches
10. Bobbin Winder controls the
bobbin while winding thread

23. 11. Balance Wheel sets the mechanism in motion.
13. Slide plate is a
movable plate that
covers the

24. 14. Throat plate is the windows
of the feed dog and it is where
the bobbin threads come out.
15. Feed Dog
moves the fabric
while sewing.

25. 16. Face plate: A
cover which on
removal gives
access to the
oiling points on
the needle bar,
presser bar and
take-up lever.
17. Spool pin for bobbin
winding: Spool of thread is placed
on this at the time of bobbin winding.

26. 1. Spool Pin
2. Thread Guide
3. Tension disc
4. Thread take up lever
9. Stitch regulator
16. Face Plate
11. Balance
wheel
8. Presser bar or
Presser foot lifter
7. Presser Foot
13. Slide plate
15. Feed dog
5. Needle clamp or Needle bar
14. Throat plate
10. Bobbin
winder
17. Spool pin for
bobbin winding

28. PARTS OF THE
SEWING MACHINE
PARTS IN THE BED

32. Shuttle holds
the bobbin case
while sewing.

33. 5. Bobbin is a metal spool for winding thread.
6. Bobbin Case holds the bobbin.

34. PARTS OF THE
SEWING
LOWER PARTS

37. 1. Band Wheel leads the balance wheel
through the belt connection.
2. Band Wheel Crank moves the band wheel.

38. 3. Pitman Rod holds the
treadle to band wheel
crank.
4. Belt Guide
holds the belt
to its place.

39. 6. Dress Guard protects
the dress from the wheel.
5. Belt Shifter
removes the
belt from the
wheel.

40. 8. Legs
support the
cabinet of
the machine.
7. Treadle is where the
feet are stationed to drive
the band wheel through
the pitman rod.
9. Cabinet holds the head of the machine by interlocking screw on the hinges.

42. ASSIGNMENT
• BRING A TAPE MEASURE TOMORROW