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Chapter 7:

Four-Thread Ultra-Stretch Mock

Safety Stitch

Four-Thread Ultra-Stretch Mock Safety Stitch

The Four-Thread Ultra-Stretch Mock Safety Stitch is stronger than the Three-Thread

Ultra-Stretch Mock Safety Stitch. The additional thread provides added strength to

the seam and is good choice for knits as well as wovens. This stitch works well when

applying ribbing to a garment. Ribbing is often seen on cuffs, collars and waistbands

of active wear. This stitch requires two needle threads and two looper threads.

Four-Thread Ultra-Stretch Mock Safety Stitch page 1

ATD:

Auto Tension Dial

“A”

Left Cover Stitch

Needle “C” Not Threaded

Middle Cover Stitch

Needle “D” Not Threaded

Right Cover Stitch

Needle “E” Not Threaded

Overedge Left

Needle “A” (Orange) Threaded

Overedge Right

Needle “B” (Blue) Threaded

Upper Looper

(Green) Looper Engaged

and Threaded

Lower Looper

(Red) Threaded

Chain Stitch Looper

(Brown) Not Threaded

Upper Looper Clutch “L”

Upper Knife Engaged

Seam Guide Plate Not Installed

Use Knife Guide

Seam Width Dial “N”

Stitch Length Dial “N”

Presser Foot

Pressure “N”

Differential Feed Dial “N”

Stitch Finger “N”

Spreader Disengaged

Set at:

Needle:

Four-Thread Ultra-Stretch Mock Safety Stitch page 2

Sweatshirt sample

Four-Thread Ultra-Stretch Mock Safety Stitch page 3

Turn Auto Tension Dial to “A”.

Turn Stitch Length Dial to “N”.

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

Four-Thread Ultra-Stretch Mock Safety Stitch page 4

Turn Presser Foot

Pressure Dial to “N”.

Turn Differential Feed

Dial to “N”.

Turn Seam Width Dial

to “N”.

 Set Stitch Finger to “N”.

Four-Thread Ultra-Stretch Mock Safety Stitch page 5

Install the Knife Cover.

Engage Upper Looper. Engaging the Upper Looper causes the looper to 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

Four-Thread Ultra-Stretch Mock Safety Stitch page 6

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 .

Four-Thread Ultra-Stretch Mock Safety Stitch page 7

Eye of Looper

Spreader Engaged Spreader Disengaged

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.

6. Thread the looper area of the machine following the green color coded

thread guides 4-9.

Four-Thread Ultra-Stretch Mock Safety Stitch 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 illustrated 1-10.

2. Pass thread from back to the front through the thread guide .

Four-Thread Ultra-Stretch Mock Safety Stitch page 9