INSTRUCTION
BOOK
CompuLock
IMPORTANT SAFETY INSTRUCTIONS
When using an electrical appliance, basic safety precautions should always be followed,
including the following. Read all instructions before using this sewing machine.
DANGER – To reduce the risk of electric shock:
1. An appliance should never be left unattended when plugged in. Always unplug this appliance from the
electrical outlet immediately after using and before cleaning.
2. Always unplug before relamping. Replace bulb with same type rated 13.5 Vac, 3 Watts.
3. Do not reach for the appliance that has fallen into water. Unplug immediately.
4. Do not place or store appliance where it can fall or be pulled into a tub or sink. Do not place in or drop
into water or other liquid.
WARNING – To reduce the risk of burns, fire, electric shock, or injury to persons:
1. Do not allow to be used as a toy. Close attention is necessary when this appliance is used by or near
children.
2. Use this appliance only for its intended use as described in this manual. Use only attachments recom-
mended by the manufacturer as contained in this manual.
3. 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. Return the appliance to the nearest authorized dealer or
service center for examination, repair, electrical or mechanical adjustment.
4. Never operate the appliance with any air opening blocked. Keep ventilation openings of the sewing
machine and foot controller free from accumulation of lint, dust and loose cloth.
5. Never drop or insert any object into any opening.
6. Do not use outdoors.
7. Do not operate where aerosol (spray) products are being used or where oxygen is being administered.
8. To disconnect, turn all controls to the off position, then remove plug outlet.
9. Do not unplug by pulling on cord. To unplug, grasp the plug, not the cord.
10. Keep fingers away from all moving parts. Special care is required around the sewing machine needle
and knives.
11. Always use the proper needle plate. The wrong plate can cause the needle to break.
12. Do not use bent needles.
13. Do not pull or push fabric while stitching. It may deflect the needle causing it to break.
14. Switch the sewing machine off when making any adjustment in the needle area, such as threading
needle, changing needle, threading loopers, or changing presser foot, and the like.
15. Always unplug the sewing machine from the electrical outlet when removing covers, lubricating, or
when making any other user servicing adjustments mentioned in the instruction manual.
SAVE THESE INSTRUCTIONS
When using your overlock machine for the first few times, place some waste fabric under the presser
foot and run the machine without thread for a few minutes. Wipe away any oil which may have ap-
peared.
1
IMPORTANT SAFETY INSTRUCTIONS
SECTION 1 PREPARATION
• Names of Parts...................................................................................................... 3
• Attaching the Waste Chip Box............................................................................... 4
• Storing the Accessory Box .................................................................................... 4
• Standard Accessories............................................................................................ 4
SECTION 2 OPERATING INSTRUCTIONS
• Plug in the Machine and Switch on Power............................................................ 5
• To Sew Using Foot Control ................................................................................... 5
• Controlling Sewing Speed ..................................................................................... 5
• How to Turn Handwheel ........................................................................................ 6
• Opening and Closing the Side Cover.................................................................... 6
• Opening and Closing the Looper Cover................................................................ 7
• The Position of Telescoping Thread Guide Bar .................................................... 7
• Attaching the Spool Cap and Net .......................................................................... 8
• Raising or Lowering the Presser Foot................................................................... 8
• Up/Down Needle Position Key .............................................................................. 8
• Screen Sharpness Adjusting Knob ....................................................................... 8
• How to Set the Needles ........................................................................................ 9
• Safety System......................................................................................................10
• Threading the Machine........................................................................................ 10
* Four – Thread Operation ............................................................................... 11
* Threading the Lower Looper .................................................................... 12–14
* Threading the Upper Looper .................................................................... 15–16
* Threading the Right Needle ..................................................................... 17–18
* How to Use Needle Threader ........................................................................ 18
* Threading the Left Needle ....................................................................... 19–20
* Threading the Double Chain Looper........................................................ 21–23
• Changing to Two – or Three – Thread Serging with Spreader ........................... 23
• Visual Touch Screen Operations ................................................................... 24–25
• To Change Screen Language ............................................................................. 24
• Automatic Thread Tension Display Screen ......................................................... 25
• Choose the Needle and Thread......................................................................25
* Check the Needle.........................................................................................25
• Stitch Package .................................................................................................... 26
• Standard Machine Settings for Automatic Thread Tension ................................. 27
• Stitch Pattern with Machine Setting .................................................................... 28
• Manual Adjustment of Thread Tension ................................................................ 29
• Manual Setting, Memory and View for Thread Tension ................................ 29–30
• Stitch Pattern and Threading ........................................................................ 31–35
1. OVERLOCK4 ................................................................................ 31
2. OVERLOCK 3 (STANDARD), OVEREDGE 3 (STANDARD),
ROLLED HEM 3,FLATLOCK 3 (STANDARD), NARROW HEM,
PICOT EDGE ................................................................................ 31
3. OVERLOCK 3 (WIDE), OVEREDGE 3 (WIDE),
FLATLOCK 3 (WIDE) .................................................................... 32
2
4. OVEREDGE 2 (STANDARD), ROLLED HEM 2,
FLATLOCK 2 (STANDARD),
WRAPPED OVERLOCK 2 (STANDARD)........................................ 32
5. OVEREDGE 2 (WIDE), FLATLOCK 2 (WIDE),
WRAPPED OVERLOCK 2 (WIDE) ................................................. 32
6. WRAPPED OVERLOCK 3 .............................................................. 33
7. COVER STITCH .............................................................................. 33
8. OVERLOCK 5 ................................................................................ 34
9. DOUBLE CHAIN ............................................................................ 35
• Starting Sewing ................................................................................................. 36
• Finishing Sewing ................................................................................................ 36
• Sewing Continuously ........................................................................................ 36
• How to Use the Guide Lines ............................................................................ 36
• Securing Ends.................................................................................................... 37
• Thread Tension Adjustment ............................................................................. 38
* Thread Tension (4 threads) .................................................................... 38–39
* Thread Tension (3 threads) .......................................................................... 40
* Rolled Hem 3 ................................................................................................ 41
* Narrow Hem.................................................................................................. 42
* Picot Edge .................................................................................................... 42
* Thread Tension (2 threads) .......................................................................... 43
* Thread tension (cover stitch) ...................................................................... 44
* Thread tension (double chain)................................................................... 45
• To Adjust Stitch Length ..................................................................................... 46
• To Adjust Differential Feed Ratio ..................................................................... 46
• To Deactivate the Upper Knife ....................................................................... 47
• To Activate the Upper Knife ............................................................................ 47
• Adjustment of Cutting Width........................................................................... 48
• Adjustment of Chaining Finger Setting Knob ................................................ 49
• Adjusting of Foot Pressure ................................................................................ 50
• Removing the Presser Foot .............................................................................. 50
• Attaching the Presser Foot .............................................................................. 50
• How to Replace the Needle Plate ................................................................. 50
• How to Replace the Extension Table ............................................................. 51
• How to Change the Upper Looper Position .................................................. 51
SECTION 4 MAINTENANCE
• Replacing the Light Bulb.................................................................................. 52
• Cleaning the Feed Dog................................................................................... 52
• Cleaning the Upper Knife Area ...................................................................... 53
• Replacing the Upper Knife .............................................................................. 53
• Oiling the Machine........................................................................................... 54
• Troubleshooting ................................................................................................ 54
SECTION 3 TEST STITCHING
3
3
2
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
21
SECTION 1 PREPARATION
Names of Parts
1 Visual touch screen
2 Thread guide indication
3 Pressure adjusting dial
4 Screen sharpness adjusting knob
5 Up/Down needle position key
6 Side cover
7 Looper cover
8 Handwheel
9 Power switch
10 Differential feed dial
11 Stitch length dial
12 Extension table (A)
13 Double chain looper
14 Lower looper
15 Upper looper
16 Upper knife
17 Chaining finger setting knob
18 Presser foot
19 Needle plate
20 Cutting width adjusting dial
21 Upper knife release knob
12
1
4
4
Attaching the Waste Chip Box
Storing the Accessory Box
1
1 Waste chip box
2 Pin
1
2
1 Waste chip box
2 Accessory box
Standard Accessories
1 Nets
2 Spool caps
3 Set of needles
4 Upper knife
5 Spreader
6 Screwdriver (large)
7 Screwdriver (small)
8 Tweezers
9 Lint brush
10 Spanner/wrench
11 Oil
12 Needle threader
13 Needle plate (B) for Cover Stitch
14 Presser foot (B) for Cover Stitch
15 Extension table (B)
1
2
3
4
5
6789
10
11
12
13
14
Insert the accessory box into the waste chip box.
15
2
Press the waste chip box against the looper
cover and slide it to the left until the pin on the
waste chip box slides into the hole on the side
plate, as illustrated.
5
To Sew Using Foot Control
5
3
7
2
6
1 Turn off the power switch. Connect the foot
control plug and the machine plug into to the
machine socket.
2 Connect the power supply plug to your
power supply.
1 Power switch 2 Foot control plug
3 Machine plug 4 Machine socket
5 Power supply plug 6 Power supply
7 Power supply cord 8 Foot control
Controlling Sewing Speed
Sewing speed can be varied by the foot
control.The harder press on the foot control,
the faster the machine runs.
Note:
* The Compulock is equipped with a protective
circuit to prevent overheating.
The machine will stop automatically if it is
running overloaded for a long time.
In such a case, follow the message that
appears on the visual touch screen.
“ For appliances with a polarized plug (one blade
wider than the other).
To reduce the risk of electric shock, this plug is intended
to fit in a polarized outlet only oneway.
If the plug does not fit fully in the outlet, reverse the
plug.
If it still does not fit, contact a qualified electrician to
install the proper outlet.
Do not modify the plug in anyway.”
1
8
Plug in the Machine and Switch on Power
Before connecting the power supplycord,
make sure the voltage and frequency shown
on the machine conform to your electrlcal
power.
* Foot control Model 21371 for use with Sewing
Machine Model 888(Compulock)
(For U.S.A. market only.)
4
SECTION 2 OPERATING INSTRUCTIONS
For Your Safety
* While in operation, always keep your eye on
the sewing area,and do not touch any mov-
ing parts such as the upper looper, handwheel,
needle or knives.
* Always disconnect the machine from the
power supply:
When leaving the machine unattended.
When attaching or removing parts.
When threading or cleaning the machine.
* Do not place anything on the foot control,
except when in use.
There are five motors for thread tension ad-
justment inside the machine which make a bit
of noise intializing when first turned on.
This sound is perfectly normal and does not
indicate a malfunction.
6
How to Turn Handwheel
1 Handwheel
Opening and Closing the Side Cover
To open:
Push the side cover to the left.
To close:
Push the side cover to the right and
slightly toward the machine body.
For Your Safety:
Always close both the side and looper
covers when the machine is in use.
1
1
Always turn the handwheel toward
you (counterclockwise).
Side cover
1
7
Opening and Closing the Looper Cover
1 Looper cover
The Position of Telescoping Thread
Guide Bar
1 Telescoping thread guide bar
2 Stoppers
3 Spool pin
4 Thread guide
1
1
2
3
To open:
While pushing with the thumb to the right as far
as it will go, pull looper cover toward you.
To close:
Lift looper cover and push against the machine.
The looper cover snaps into the position
automatically.
1 Pull the telescoping thread guide bar
up as far as it will go.
2 Turn the thread guide bar until it clicks
into position.
Thread guides should stop directly
above the spool pins.
4
1 , 2
8
Attaching the Spool Cap and Net
1 Spool holder
2 Spool cap
3 Slit
4 Spool pin
5 Net
Raising or Lowering the Presser Foot
By raising or lowering the presser foot lifter,
the presser foot goes up and down.
* While in operation, keep the presser foot
lowered except for when threading the
machine.
Thread tension will be released when the presser
foot lifter is raised.
1 Presser foot lifter
2 Presser foot
1
2
3
4
5
1
2
1 When you use a small thread spool, remove
the spool holder from the spool pin.
Then place the spool with its slit side up, and
put a spool cap on top.
2 If the thread slips down from the spool while
threading or sewing, put a net on the
spool, as illustrated, to prevent jamming.
The nets are supplied with the machine.
1
2
Press the Up/Down needle position key to bring
the needle to its lowest position.
When pressed again, the needle goes up and stops
in the highest position.
1 Up/down needle position key
Up/Down Needle Position Key
1
1
Screen Sharpness Adjusting Knob
The brightness of the screen can be changed by
turning the sharpness adjusting knob.
1 Screen sharpness adjusting knob
9
* Please use a size 11 or 14 needle.
* There are 4 holes for inserting needles,
depending on the desired stitch selection.
Make sure all 4 screws are tightened even if
no needle is inserted in the clamp.
1 Needle
2 Flat side
3 Needle clamp screw (4 screws)
4 Screwdriver
5 RB (Right Back)
6 LB (Left Back)
7 RF (Right Front)
8 LF (Left Front)
9 Needle clamp screw for RB
10 Needle clamp screw for LB
11 Needle clamp screw for RF
12 Needle clamp screw for LF
To remove a needle
Disconnect the machine from the power
supply. Raise the needle to its highest posi-
tion.
Then loosen the needle clamp screw to
remove the needle.
To replace a needle
To attach the needle, insert it into the needle
clamp, flat side to the back.
Slide it all the way up until it stops, then tighten
the needle clamp screw.
a 4 threads or wrapped overlock 3
b 2 or 3 threads
c Cover stitch
d 5 threads
e Double chain
* Do not use any needle which is bent or blunt.
2
1
3
4
9
a
b
c
d
e
11
5
7
10
12
6
8
How to Set the Needles
10
Threading the Machine
1
2
3
45
6
7
1 Thread guide
2 Double chain looper thread
3 Lower looper thread
4 Upper looper thread
5 Right needle thread
6 Left needle thread
*The machine has been threaded
with 4 threads (Overlock 4) at the
factory for popular sewing.
7 Threading chart
Safety System
You can operate the machine easily and safely because of the following major safety functions.
The machine does not run when you pressed the foot control because...
1 The looper cover or side cover is opened when you start sewing.
2 Presser foot lifter is raised.
3 The needle plate is not appropriate for the chosen stitch pattern.
4 The upper looper setting dial is in the incorrect position for the chosen stitch pattern.
5 The upper knife is in the incorrect position for the chosen stitch pattern.
The above error messages will appear on the visual touch screen when you press the foot
control.
However, you can press OK key to ignore the warning and accept the upper knife position
(activated or deactivated). This may be appropriate for certain special stitches/operations.
A convenient threading chart is
placed the machine body inside
the looper cover.
11
3
2
1
1 Upper looper thread
2 Lower looper thread
3 Needle threads
If the machine becomes unthreaded, thread
the lower looper first, then the upper looper,
needle on the right and needle on the left.
* A convenient threading chart is placed the
machine body inside the looper cover.
When first threading the machine, or rethreading
after a break, please do the following:
1 Turn the handwheel toward you until the
needles are in the full up position, and pull
out about 10 cm (4”) of thread from the tip
of the upper looper.
2 Pull out 10 cm (4”) of thread from the tip of
the lower looper.
3 Pull out 10 cm (4”) of needle thread and
draw it toward the back of the machine
under the presser foot.
Now, lower the presser foot and sew.
Incorrect threading will cause skipped
stitches, broken thread or uneven thread
tension.
Before starting to sew, make sure that your
machine is threaded properly.
Turn off the power switch before threading the
machine.
The machine has been threaded at the factory
with short length of thread.
To thread the machine with your own thread,
tie it firmly to the upper end of the thread in the
machine, then raise the presser foot and pull the
other end.
For the needle threads, pull the bottom end of
thread until the knot comes to the needle eye,
and cut on both sides of the knot.
1, 2, 3
Four- Thread Operation
12
4
5
6
7
8
9
10
11
1
1 Thread guide
1
2
3
1
Threading the Lower Looper
Open the looper cover.
Raise the presser foot lifter.
Place a spool of thread on the spool pin
second from the right.
* The points to thread for lower looper
are marked in light green.
* A convenient threading chart is placed
on the machine body inside the looper
cover.
1 Draw the thread through the thread guide
second from the right from back to front.
13
7
2
3
4, 5, 6
5 Lower looper thread guide (1)
6 Lower looper thread guide (2)
2 Top cover thread guide
7, 8
7 Looper thread take-up lever (lower)
8 Lower looper thread guide (3)
3 Thread tension unit
2
3
4
5
2 Slide the thread under the top cover thread
guide second from the right side, as illustrated.
3 Hold the thread at both ends and tug gently
to ensure the thread is correctly inserted in
the thread tension unit.
4 Pass the thread through the center of the
looper thread guide, as illustrated.
4 Looper thread guide
5, 6
Pass the thread through the two lower looper
thread guides, as shown.
7 Pass the thread through the looper thread
take-up lever (lower).
8 Pass the thread through the lower looper
thread guide (3), as illustrated.
6
8
14
9 Lower looper thread guide (4)
9
10
10 Lower looper thread guide (5)
11
11 Lower looper
12 Needle thread
How to Thread Woolly Nylon or
Polyester Thread
1 Lower looper
2 Ordinary thread
3 Woolly nylon or polyester thread
9
10
11
12
3
1
2
9 Turn the handwheel toward you to move
the lower looper to the right side.
Then, push down the lower looper thread
guide (4) with your finger, as illustrated.
In this way, the lower looper thread guide (4)
and (5) are moved to the right for easy
threading.
10 Pass the thread through lower looper thread
guides (4) and (5), as illustrated.
Holding the end of the thread, push the
lower looper thread guide (4) up with your
other hand to return it to its original position,
as illustrated.
Lower looper thread guides (4) and (5) will
return to their original position automatically
when you turn the handwheel toward you.
11 Move the lower looper to its rightmost
position by turning the handwheel, and
pass the thread through the hole in the lower
looper with the tweezers 10 cm (4") or more.
Make sure the needle threads are not
tangled in the lower looper and close the
looper cover.
* The illustration to the left demonstrates a
convenient way to thread the lower looper
with woolly nylon or polyester thread.
Use the same method with the upper looper.
X= incorrect
= correct
12
15
Threading the Upper Looper
1
3
4
5
6
7
8
1
2
3
1 Thread guide
2 Top cover thread guide
2
3 Thread tension unit
3
2
1
Open the looper cover.
Raise the presser foot lifter.
* Place a spool of thread on the
center spool pin.
* The points to thread for the upper
looper are marked in red.
* A convenient threading chart is
placed on the machine body
inside the looper cover.
1 Draw the thread through the
center guide from back to front.
2 Slide the thread under the top
cover thread guide third from the
right, as illustrated.
3 Hold the thread at both ends and
tug gently to ensure the thread is
correctly inserted in the thread
tension unit.
16
4, 5
4 Looper thread guide
5 Upper looper thread guide (1)
6 Looper thread take-up lever (upper)
6
7, 8
7 Upper looper thread guide (2).
8 Upper looper
How to Thread the Upper Looper
4
5
6
8
7
1
4 Pass the thread through left side of the looper
thread guide.
5 Pass the thread through the upper looper
thread guide (1).
6 Pass the thread through the looper thread
take-up lever (upper).
7 Pass the thread through the upper looper
thread guide (2).
8 Holding the end of the thread with a pair of
tweezers, pass it through the hole in the up-
per looper.
Pull 10 cm (4”) or more of thread through the
hole.
1 Upper looper
2 Lower looper thread
Turn the handwheel toward you until the up-
per looper comes to the mid point of its travel,
and unhook the thread of the lower looper
from the upper looper.
2
2
17
Threading the Right Needle
1
2
3
4
5
6
7
8
1
2
1 Thread guide
2 Top cover thread guide
1
2
Raise the presser foot lifter.
Place a spool of thread on the spool
pin second from the left.
* The points to thread for the right needle
are marked in green.
* A convenient threading chart is placed
on the machine body inside the looper
cover.
1 Draw the thread through the thread
guide (second from the left) from back
to front.
2 Slide the thread under the top cover
thread guide (second from left) from the
right side.
18
1 Holder 2 Arrow 3 Needle thread
4 "Y" Groove 5 "V" Groove
3
4, 5, 6
7, 8
7 Needle bar thread guide
8 Right needle
3 Thread tension unit
How to Use Needle Threader
1 Hold the threader in your right hand with
the “V” groove and arrow facing toward you.
2 With the thread in your left hand place the
thread in the “Y” groove and turn needle threader
once clockwise to place the “V” groove
and arrow facing up.
3 Holding the thread in your left hand, gently slide
the needle threader down the needle while at
the same time placing enough pressure on the
threader to ensure the inside pin meets the eye
of the needle.
4 Push the pin through the needle eye forming
a thread loop.
5 Remove the threader and draw the loop towards
the back of the needle.
Turn off the power switch before using the
needle threader.
3
5
6
4
7
2
3
4
5
1
3 Hold the thread at both ends and tug gently
to ensure the thread is correctly inserted in the
thread tension unit.
4, 5
Pass the thread under the right needle thread
guide, then, pull it up and over the right take-
up lever cover.
6 Pass the thread through the needle
thread guide.
7 Raise the needle bar to its highest point by
turning the handwheel toward you then
thread the needle bar thread guide.
8 Pull out the thread 10 cm (4”) after threading
the right needle.
8
1, 2
3, 4
5
4 Right needle thread guide
5 Right take-up lever cover
6 Needle thread guide
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