Page 1
Three-Thread Overlock
(
Narrow, Wide, and Wide
with Decorative Threads)
Page 2
Three-Thread Overlock (Narrow)
The Three-Thread Overlock Stitch is the most commonly used stitch because of
its versatility. It provides a wonderful professional seam finish to woven fabrics. It is
beneficial in preventing loosely woven fabrics from unraveling. In addition, the
Three-Thread Overlock Stitch offers unlimited decorative capabilities. It is
recommended for finishing seams but not reinforcing the seam. Use the conventional
sewing machine’s straight stitch to reinforce the seam. The stitch uses one overedge
needles and both the upper looper and lower looper. There are 2 different ways to set
up for a Three-Thread Overlock stitch. For a more narrow stitch (4.0) select the Right
Overedge needle; for a wider stitch (6.0) the Left Overedge needle is used.
Right Overedge Needle Thread
Upper Looper Thread
Lower Looper Thread
Three-Thread Overlock (narrow) page 1
Page 3
Needle:
Set-up:
ATD:
Auto Tension Dial
Left Cover Stitch
Needle “C”
Middle Cover Stitch
Needle “D”
Right Cover Stitch
Needle “E”
Overedge Left
Needle “A”
Overedge Right
Needle “B” (Blue)
Upper Looper
(Green)
Spreader Not Used
Lower Looper
(Red)
Chain Stitch Looper
(Brown)
Upper Knife Engaged
Seam Guide Plate Not Installed, use
Seam Width Dial “N”
“A”
Unthreaded and
Remove Needle
Unthreaded and
Remove Needle
Unthreaded and
Remove Needle
Unthreaded and
Remove Needle
Threaded
Looper Engaged
and Threaded
Threaded
Unthreaded
Knife Cover Plate
Stitch Length Dial “2”
Presser Foot
Pressure
Differential Feed Dial “N”
Stitch Finger “N”
Three-Thread Overlock (narrow) page 2
“N”
Page 4
The Three-Thread Overlock
makes a great edge finish to a
garment’s facing.
Three-Thread Overlock (narrow) page 3
Page 5
Turn Auto Tension Dial to “A”.
Turn Stitch Length Dial to “2”.
Engage Upper Knife. The knife will not trim the fabric when it is disengaged.
1. Open Looper Cover.
2. Pull
3. Turn the holder clockwise until the knife clicks into a lock position.
the movable knife holder (silver screw) to the right as far as it will go.
Upper Knife Engaged Upper Knife Disengaged
Three-Thread Overlock (narrow) page 4
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Turn Presser Foot
Pressure Dial to “N”.
Turn Differential Feed
Dial to “N”.
Turn Seam Width Dial
to “N”.
Set Stitch Finger to “N”.
Three-Thread Overlock (narrow) page 5
Page 7
Install the Knife Cover.
Engage Upper Looper. Engaging the Upper Looper causes the looper move when
sewing. Even though the Upper Looper is not threaded it needs to be engaged.
1. Push the clutch button to the left and down to engage.
2. Turn handwheel.
Upper Looper Disengaged
Upper Looper Engaged
Three-Thread Overlock (narrow) page 6
Page 8
Disengage Spreader. The Upper Looper has a hole for the thread on the top of the
looper. If the stitch requires that the looper be engaged but not threaded, then the
Spreader is used. The Spreader simply plugs-in (or closes) the looper’s hole. The
Spreader is disengaged when the Upper Looper is engaged/operative and threaded.
The Spreader is used with a stitch that requires only one looper thread. With
the help of the Spreader, the single looper thread wraps around the fabric’s
edge.
1. Lower the white handle on the Spreader to open the eye of the Upper
Looper.
Eye of Looper
Spreader Engaged Spreader Disengaged
Thread Upper Looper with regular overlock thread.
1. Raise the Presser Foot to release the
tension disks. Thread the Lower
Looper as illustrated 1-9.
2. Pass thread from back to the
front through the thread
guide.
Two-Thread Overedge (narrow) page 7
Page 9
3. Thread the top cover thread guide by pulling the thread towards the left until
it slips under the guide. Then pull the thread along the right side of the
button as illustrated.
4. While holding the thread, firmly pull the thread between the tension disks.
5. Turn the handwheel toward you until the lower looper extends 5-10mm
(approximately ½”) from the needle plate edge.
6. Thread the looper area of the machine following the green color coded
thread guides 4-9.
Three-Thread Overlock (narrow) page 8
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7. Thread the hole in the Upper Looper from front to back . Pull about 4
inches of thread through the looper and place to the back of the
throat plate.
Thread Lower Looper with regular overlock thread.
1. Raise the Presser Foot to release the tension disks. Thread the Lower
Looper as indicated 1-10.
2. Pass thread from back to the front
through the thread guide .
3. Thread the top cover thread guide by pulling the thread towards the left until
it slips under the guide. Then pull the thread along the right side of the
button as illustrated.
Three-Thread Overlock (narrow) page 9
Page 11
4. While holding the thread, firmly pull the thread between the tension disks.
5. Turn the handwheel toward you until the lower looper extends 5-10mm
(approximately ½”) from the needle plate edge.
6. Thread the looper area of the machine following the red color coded
thread guides 4-10.
7. Place the thread slighty from left and
to the right of threading guide .
8. Place the thread slightly from the
front and to the back of threading
guide .
9. Place the thread through , and .
Three-Thread Overlock (narrow) page 10
Page 12
10. Thread the looper eye (A) from front to back. Pull about 4 inches of thread.
Position thread into V cutout (B) on threader. Firmly hold thread tail with left
hand and pull Threader Lever (C) up into place (D).
“V” cutout
Threader Lever
NOTE: Make sure the Upper Looper thread is
behind the Lower Looper thread.
Three-Thread Overlock (narrow) page 11
Page 13
Thread Right Overedge needle with regular thread.
1. Raise the Presser Foot to release the tension disks. Thread the right
needle as indicated 1-9.
2. Pass thread from back to the front
through the thread guide .
3. Thread the top cover thread guide by pulling the thread towards the left until
it slips under the guide. Then pull the thread along the right side of the
button as illustrated.
4. While holding the thread firmly, pull the thread between the tension disks.
Three-Thread Overlock (narrow) page 12
Page 14
5. Continue to thread points 4-8. Slip the thread into the rear slot of the
thread guide . Go over the take up lever . Continue by slipping the
thread into the right slot of the thread guides and .
8. Before threading the eye of the needle, make sure the thread is
behind
the thread guide located on the bottom of the needle clamp.
9. Draw about 4 inches of the thread through the needle eye towards the back
of the machine.
10. Place the thread to the back, under the Presser Foot.
Three-Thread Overlock (narrow) page 13
Page 15
Align one piece of medium weight fabric so
that the knife just slightly trims the fabric edge.
Sew.
Align a second piece of medium weight fabric
so that the knife just slightly trims the fabric
edge.
Place the two fabrics, right sides together.
Using a conventional sewing machine, sew a
straight stitch with a ⅝ inch seam.
Press the seam open.
Three-Thread Overlock (narrow) page 14
Page 16
Three-Thread Overlock (Wide)
The Three-Thread Overedge (wide) has the same set up as the Three-Thread Overedge (narrow) Stitch. The only exceptions are the Right
unthreaded and removed and the Left Overedge Needle is threaded. By using the
left needle the stitch becomes wider. The other exception is the Auto Tension Dial
is turned to “B”.
Left Overedge Needle Thread
Overedge Needle is now
Right Overedge Needle Thread
Three-Thread Overlock (wide) page 1
Page 17
Needle:
Set-up:
ATD:
Auto Tension Dial
Left Cover Stitch
Needle “C”
Middle Cover Stitch
Needle “D”
Right Cover Stitch
Needle “E”
Overedge Left
Needle “A” (Orange)
Overedge Right
Needle “B”
Upper Looper
(Green)
Spreader Disengaged
Lower Looper
(Red)
Chain Stitch Looper
(Brown)
Upper Knife Engaged
Seam Guide Plate Not Installed, use
Seam Width Dial “N”
“B”
Unthreaded and
Remove Needle
Unthreaded and
Remove Needle
Unthreaded and
Remove Needle
Threaded
Unthreaded and
Remove Needle
Looper Engaged
and Threaded
Threaded
Unthreaded
Knife Plate Cover
Stitch Length Dial “2”
Presser Foot
Pressure
Differential Feed Dial “N”
Stitch Finger “N”
“N”
Three-Thread Overlock (wide) page 2
Page 18
Thread Left Overedge needle with regular thread.
1. Raise the Presser Foot to release the tension disks. Thread the
left needle as illustrated 1-9.
2. Pass thread from back to the front
through the thread guide.
3. Thread the top cover thread guide by pulling the thread towards the left until
it slips under the guide. Then pull the thread along the right side of the
button as illustrated.
4. While holding the thread firmly, pull the thread between the tension disks.
Three-Thread Overlock (wide) page 3
Page 19
5. Continue to thread points 4-8. Slip the thread into the middle slot of the
thread guide . Go over the take up lever . Continue by slipping the
thread into the middle slot of the thread guides and .
6. Before threading the eye of the needle, make sure the thread is behind
the thread guide located on the bottom of the needle clamp.
7. Thread the eye of the left needle .
8. Draw about 4 inches of the thread through the needle eye towards the back
of the machine.
9. Place the thread to the back, under the Presser Foot.
Three-Thread Overlock (wide) page 4
Page 20
Turn Auto Tension Dial to “B”.
Turn Stitch Length Dial to “2”.
Align one piece of medium weight fabric so
that the knife just slightly trims the fabric edge.
Sew.
Three-Thread Overlock (wide) page 5
Page 21
Three-Thread Overlock (Wide—Decorative Thread)
Using decorative threads can duplicate the look of fine braids and bindings often
found only in ready-to-wear. It is easy to embellish sewing projects with decorative
thread. Threads such as texturized nylon thread, crochet thread, pearl cotton, yarn
and more easily slide through the eye of the looper. Select soft, flexible threads for
best results.
Three-Thread Overlock (wide-decorative) page 1
Page 22
Needle:
Set-up:
ATD:
Auto Tension Dial
Left Cover Stitch
Needle “C”
Middle Cover Stitch
Needle “D”
Right Cover Stitch
Needle “E”
Overedge Left
Needle “A” (Orange)
Overedge Right
Needle “B”
Upper Looper
(Green)
Spreader Disengaged
Lower Looper
(Red)
Chain Stitch Looper
(Brown)
Upper Knife Engaged
Seam Guide Plate Not Installed, use
Seam Width Dial “N”
“B”
Unthreaded and
Remove Needle
Unthreaded and
Remove Needle
Unthreaded and
Remove Needle
Threaded
Unthreaded and
Remove Needle
Looper Engaged
and Threaded
Threaded
Unthreaded
Knife Plate Cover
Stitch Length Dial “2”
Presser Foot
Pressure
Differential Feed Dial “N”
Stitch Finger “N”
Three-Thread Overlock (wide-decorative) page 2
“N”
Page 23
Thread Upper Looper with decorative thread
1. Raise the Presser Foot to release the tension disks. Thread the Lower
Looper as illustrated 1-9.
2. Pass thread from back to the
front through the thread
guide.
3. Thread the top cover thread guide by pulling the thread towards the left until
it slips under the guide. Then pull the thread along the right side of the
button as illustrated.
4. While holding the thread firmly, pull the thread between the tension disks.
.
Three-Thread Overlock (wide-decorative) page 3
Page 24
5. Turn the handwheel toward you until the lower looper extends 5-10mm
(approximately ½ inch) from the needle plate edge.
6. Thread the looper area of the machine following the green color coded
thread guides 4-9.
7. Thread the hole in the Upper Looper from front to back . Pull about 4
inches of thread through the looper and place to the back of the
throat plate.
Three-Thread Overlock (wide-decorative) page 4
Page 25
Thread Lower Looper with decorative overlock thread.
1. Raise the Presser Foot to release the tension disks. Thread the Lower
Looper as illustrated 1-10.
2. Pass thread from back to the front
through the thread guide .
3. Thread the top cover thread guide by pulling the thread towards the left until
it slips under the guide. Then pull the thread along the right side of the
button as illustrated.
4. While holding the thread, firmly pull the thread between the tension disks.
5. Turn the handwheel toward you until the lower looper extends 5-10mm
(approximately ½ inch) from the needle plate edge.
Three-Thread Overlock (wide-decorative) page 5
Page 26
6. Thread the looper area of the machine following the red color coded
thread guides 4-10.
7. Place the thread slighty from left and
to the right of threading guide .
8. Place the thread slightly from the
front and to the back of threading
guide .
9. Place the thread through , ,and .
10. Thread the looper eye (A) from front to back. Pull about 4 inches of thread.
Position thread into V cutout (B) on threader. Firmly hold thread tail with left
hand and pull Threader lever (C) up into place (D).
“V” cutout
11. Thread eye of looper.
Threader Lever
NOTE: Make sure the Upper
Looper thread is behind the Lower Looper
thread.
Three-Thread Overlock (wide-decorative) page 6
Page 27
Thread Overedge Left needle with regular thread.
1. Raise the Presser Foot to release the tension disks. Thread the
left needle as illustrated 1-9.
2. Pass thread from back to the front
through the thread guide .
3. Thread the top cover thread guide by pulling the thread towards the left until
it slips under the guide. Then pull the thread along the right side of the
button as illustrated.
4. While holding the thread firmly, pull the thread between the tension disks.
Three-Thread Overlock (wide-decorative) page 7
Page 28
5. Continue to thread points 4-8. Slip the thread into the middle slot of the
thread guide . Go over the take up lever . Continue by slipping the
thread into the middle slot of the thread guides and .
6. Before threading the eye of the needle, make sure the thread is behind
the thread guide located on the bottom of the needle clamp.
7. Thread the eye of the Left Overedge Needle .
8. Draw about 4 inches of the thread through the needle eye towards the back
of the machine.
9. Place the thread to the back, under the Presser Foot. Lower foot and sew.
Three-Thread Overlock (wide-decorative) page 8
Page 29
Align double-sided quilted fabric so that the
knife just slightly trims the fabric edge.
Sew.
Three-Thread Overlock (wide decorative) page 9
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