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.
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Needle:

Set at:
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 (Blue) Upper Looper (Green) Spreader Lower Looper (Red) Chain Stitch Looper (Brown) Upper Looper Clutch Upper Knife Seam Guide Plate Seam Width Dial Stitch Length Dial Presser Foot Pressure Differential Feed Dial Stitch Finger A Not Threaded Not Threaded Not Threaded Threaded Threaded Looper Engaged and Threaded Disengaged Threaded Not Threaded L Engaged Not Installed Use Knife Guide N N N N N
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Sweatshirt sample

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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 Disengaged

Upper Knife Engaged
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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.
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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 loopers 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 fabrics 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.
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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 inch) from the needle plate edge.
6. Thread the looper area of the machine following the green color coded thread guides 4-9.
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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 illustrated 1-10. 2. Pass thread from back to the front through the thread guide.
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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 inch) 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
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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.
Thread Right Overedge needle with regular overlock thread. 1. Raise the Presser Foot to release the tension disks. Thread the right needle as illustrated 1-9. 2. Pass thread from back to the front through the thread guide.
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4. 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.
5. Before threading the eye of the needle, make sure the thread is behind the thread guide located on the bottom of the needle clamp. 6. Thread the eye of the Overedge Right Needle.
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Thread Left Overlock 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 towards the right side of the button as illustrated.
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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.
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Fold ribbing lengthwise. Place ribbing on top of fleece. Align the fabric so that the knife just slightly trims both the ribbing and fleece fabric edges. Sew, stretching the ribbing as needed.
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