Singer QuantumLock User manual

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Three-Thread Overlock

(Narrow, Wide, and Wide

with Decorative Threads)

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.

Upper Looper Thread

Lower Looper Thread

Right Overedge Needle Thread

Three-Thread Overlock (narrow) page 1

ATD:

Auto Tension Dial

“A”

Left Cover Stitch

Needle “C”

Unthreaded and

Remove Needle

Middle Cover Stitch

Needle “D”

Unthreaded and

Remove Needle

Right Cover Stitch

Needle “E”

Unthreaded and

Remove Needle

Overedge Left

Needle “A”

Unthreaded and

Remove Needle

Overedge Right

Needle “B” (Blue)

Threaded

Upper Looper

(Green)

Looper Engaged

and Threaded

Lower Looper

(Red)

Threaded

Chain Stitch Looper

(Brown)

Unthreaded

Upper Knife Engaged

Seam Guide Plate Not Installed, use

Knife Cover Plate

Seam Width Dial “N”

Stitch Length Dial “2”

Presser Foot

Pressure

“N”

Differential Feed Dial “N”

Stitch Finger “N”

Spreader Not Used

Set-up:

Needle:

Three-Thread Overlock (narrow) page 2

The Three-Thread Overlock

makes a great edge finish to a

garment’s facing.

Three-Thread Overlock (narrow) page 3

Three-Thread Overlock (narrow) page 4

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 the movable knife holder (silver screw) to the right as far as it will go.

3. Turn the holder clockwise until the knife clicks into a lock position.

Upper Knife EngagedUpper Knife Disengaged

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

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

Two-Thread Overedge (narrow) page 7

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.

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.

Spreader Engaged Spreader Disengaged

Eye of Looper

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

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