Singer HEAVY DUTY 4423 User manual

For use with the SINGER® HEAVY DUTY 4423 Sewing Machine
SEWING MACHINE

Table of Contents
CAUTIONS 5
OVERVIEW 6
PARTS LIST 7
WINDING THE BOBBIN 8
INSERTING THE BOBBIN 10
THREADING THE UPPER THREAD 12
AUTOMATIC NEEDLE THREADER 14
RAISING THE BOBBIN THREAD 16
HOW TO CHOOSE YOUR PATTERN 17
THREAD TENSION 18
STITCH WIDTH DIAL & STITCH LENGTH DIAL 20
BEGINNING TO SEW 22
INSERTING & CHANGING NEEDLES 24
TROUBLESHOOTING 26

5
Cautions
To reduce the risk of burns, fire, electric, shock, or injury:
• Never operate this appliance if it has a damaged cord or plug, if
it is not working properly, if it has been dropped or damaged, or
dropped into water.
• Never operate the appliance with any air openings blocked.
Keep ventilation openings of the sewing machine and foot
controller free from accumulation of lint, dust, and loose cloth.
• Keep fingers away from all moving parts. Special care is
required around the sewing machine needle.
• Always use the proper needle plate. The wrong plate can cause
the needle to break.
• Do not use bent needles.
• Do not pull or push fabric while stitching. It may deflect the
needle causing it to break.
• Switch the sewing machine off when making any adjustments
in the needle area, such as threading needle, changing needle,
threading bobbin, or changing presser foot, and the like.
• To disconnect, turn all controls to the off position, then remove
plug from outlet.
• Do not unplug by pulling on cord. To unplug, grasp the plug, not
the cord.
• Never place anything on the foot controller.

6
The Singer Heavy Duty 4423 is a mechanical sewing machine with a
powerful motor and high sewing position, which along with its high
speed sewing capability makes it perfect for heavy-duty sewing tasks.
With adjustable presser foot pressure, you can sew heavy fabrics such
as canvas or denim as well as very lightweight sheers, and the stainless
steel bedplate allows fabrics to glide over the machine with ease. The
23 stitches include six basic stitches, four stretch stitches, 12 decorative
stitches, and one style of buttonhole.
You can also download the SINGER Sewing Assistant App on your
phone for additional instruction and tutorials.
While in operation, always keep your eyes on the sewing area.
Do not touch any moving parts, such as the thread take-up lever,
handwheel or needle.
Overview

7
1. Thread tension dial
2. Presser foot pressure adjustment
3. Thread take-up lever
4. Reverse sewing lever
5. Thread cutter
6. Presser foot
7. Needle plate cover
8. Removable extension table/
accessory storage
9. Three needle position dial
10. Bobbin stopper
11. Stitch width dial
12. Stitch length dial
13. Pattern selector dial
14. Automatic threader
15. One step buttonhole lever
16. Horizontal spool pin
17. Bobbin winding spindle
18. Hole for second spool pin
19. Handwheel
20. Buttonhole stitch balance
adjustment slot
21. Power and light switch
22. Main plug socket
23. Bobbin thread guide
24. Upper thread guide
25. Face plate
26. Handle
27. Presser foot lifter
28. Drop feed control
29. Foot speed control
30. Power cord
Parts List

8
• Place thread and corresponding spool holder on to spool pin. (1/2)
• Snap thread into thread guide. (3)
• Wind thread clockwise around bobbin winder tension discs. (4)
• Thread bobbin as illustrated and place on spindle. (5)
• Push bobbin spindle to right. (6)
• Hold thread end securely. (7)
• Step on foot control pedal. (8)
• Trim thread close to the bobbin & then continue winding until bobbin
is full. (9)
• Cut thread, push bobbin spindle to left (10) and remove.
Note: When the bobbin winder spindle is in “bobbin winding”position,
the machine will not sew and the hand wheel turn. To start sewing,
push the bobbin winder spindle to the left (sewing position).
Winding the Bobbin

9

10
Inserting the Bobbin
Turn power switch to off before inserting or removing the bobbin.
• Remove the bobbin cover plate by pushing the small tab to the right
of the cover towards the right.
• Insert the bobbin in the bobbin case with the thread running
counterclockwise direction (arrow).
• Pull the thread through the slit (A).
• Draw the thread clockwise until it slips into the notch (B), while
holding the bobbin down with the tip of your finger.
• Pull out about 15 cm (6 inches) of thread towards the back of the
plate and attach the bobbin cover plate. (C)

11

12
Threading the Upper Thread
• Start by raising the needle to its highest point (1), and continue turning the
handwheel* counterclockwise until the needle just slightly begins to descend.
Never turn the handwheel away from you as this may cause the timing to be
disrupted. Always turn the handwheel counterclockwise (towards you).You
must raise the presser foot to release the tension discs.
• For safety, it is strongly suggested you turn off the power before threading.
• Lift up the spool pin. Place the spool of thread on the holder with the thread
coming off the spool from the back as shown and place appropriate spool
holder next to the spool. For small thread spools, place small side of spool
holder next to spool. (2)
• Draw thread from spool through the upper thread guide (3) and pulling thread
through pre-tension spring as illustrated. (4)
• Thread tension module by leading thread down right channel. (5)
• During this process it is helpful to hold the thread between the spool and
thread guide, as this will help to seat the thread between the tension discs.
• At the top of this movement pass thread from right to left through the slotted
eye of the take-up lever and then downwards again. (6)
• Now pass the thread behind the horizontal thread guide, and then behind the
thin wire needle clamp guide (7) and then down to the needle which should be
threaded from front to back.
• Pull about 6 - 8 inches of thread under the presser foot to the rear beyond the
needle eye. Trim thread to length with built-in thread cutter. (8)

13

14
Automatic Needle Threader
• Turn the power switch to OFF
• Thread upper tension of machine up to the thin wire in front of the needle
clamp.
• Raise the needle to its highest position.
• Set machine to straight stitch.
• Press lever (A) down as far as it will go, and gently insert the hook of the
threader into the eye of the needle by swinging the lever towards you when it
is fully lowered.
• The threader automatically swings to the threading position (B).
• Pass thread under thread guide (C), from left to right.
• Pass the thread in front of the needle around the hook (D) from bottom to top.
• Release lever (A), by swinging it away from you & then pushing it back up to
the resting position.
• Pull the thread through the needle eye.

15

16
Raising the Bobbin Thread
• Hold the upper thread with the left hand. Turn the handwheel (1) towards you
(counterclockwise) lowering, then raising needle.
• Gently pull on the upper thread to bring the bobbin thread up through the
needle plate hole. (2)
• Lay both threads to the back under the presser foot. (3)
• If it is difficult to raise the bobbin thread, check to make sure the thread is not
trapped by the hinged cover or the Removable Extension Table.

17
How to Choose Your Pattern
The diagram below displays the stitch patterns available on the machine.
Stitches in the top of the diagram are indicated on the pattern selector
dial in gray. To select the patterns indicated with the gray color, turn the
pattern selector dial. (e) Use the stitch length dial (d) to adjust the stitch
length as desired for the project. Use the stitch width dial (c) to adjust the
width of the stitch as desired. Stitches in the bottom row of the diagram are
indicated on the pattern selector dial in blue. The blue indicates that the
stitch is a stretch stitch pattern. The pattern selector dial may be turned in
either direction.
The needle position can be altered with the “Three needle position dial”, shown on
the bottom left. For normal work, the needle position is middle. For edge stitching or
sewing parallel lines of top stitch, select needle position left or right. For twin needle
stitching, needle position is middle.
a. Reverse sewing
lever
b. Three needle
position dial
c. Stitch width dial
d. Stitch length dial
e. Pattern selector
dial

18
Upper thread tension
Basic thread tension setting: “4”. (1)
To increase the tension, turn the dial to the next number up. To reduce the
tension, turn the dial to the next number down.
A. Normal thread tension for straight stitch sewing.
B. Thread tension too loose for straight stitch sewing. Turn dial to higher number.
C. Thread tension too tight for straight stitch sewing. Turn dial to lower number.
D. Normal thread tension for zig zag and decorative sewing. Correct thread
tension is when a small amount of the upper thread appears on the bottom side
of fabric.
If the thread is looping or birdnesting on the underside of the fabric, this is an
indication that the upper machine tension is not threaded correctly.
The bobbin tension has been set correctly at the factory, so you do not need to
adjust it.
• Proper tension setting is important for strong seams.
• There is no single tension setting appropriate for all stitch functions, thread
or fabric.
• A balanced tension (identical stitches both top and bottom) is usually only
desirable for straight stitch construction sewing.
• 90% of all sewing will be between “3” and “5”.
• For zig zag and decorative sewing stitch functions, thread tension should
generally be less than for straight stitch sewing.
• For all decorative sewing you will always obtain a nicer stitch and less fabric
puckering when the upper thread appears on the bottom side of your fabric.
• If the thread is looping or birdnesting on the top of the fabric,this is an
indication that the bobbin thread has not been threaded correctly.
Thread Tension

19

20
Stitch Width Dial & Stitch Length Dial
Function of stitch width dial
When doing a zig zag or a decorative pattern you can alter the width
from 1mm to 6mm. To obtain a very narrow stitch, set the dial to 1, to
obtain the maximum 6mm width, set the dial to 6. When the dial is set
to 0, you will obtain a straight stitch. (1)
Function of stitch length dial while zig-zag stitching
Set the pattern selector dial to zig zag or any other decorative pattern.
The density of zig zag or decorative stitches increases as the setting
of the stitch length dial approaches “0”. The smaller the number the
closer, or denser the stitches will be. Standard zigzag stitches are
usually achieved at “3” or below. Dense zig-zag stitches are called satin
stitches. (2)
Function of stitch length dial for when straight stitching
For straight stitch sewing, turn the pattern selector dial to the straight
stitch setting. Turn the stitch length dial, and the length of the
individual stitches will decrease as the dial approached “0”. The length
of the individual stitches will increase as the dial approaches “4”.
Generally speaking, use a longer stitch length when sewing heavier
weight fabrics or when using a thicker needle or thread. Use a shorter
stitch length when sewing lighter weight fabrics or when using a finer
needle or thread.
• The standard setting for sewing a seam is between 2 and 3.
• For basting purposes, set the stitch length all the way to 4 (longest).