How to Thread a Janome Serger 644D

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Threading a serger simply takes a little patience.
Threading a serger simply takes a little patience. (Image: white thread spools image by Sergey Lukianov from Fotolia.com)

Sergers are challenging to thread, and the Janome Serger 644D is no exception. New sergers are prethreaded in the factory, from the tension discs to the needles. Simply add thread spools, connect them to the existing threads, and pull the thread through the machine. If your serger is not threaded, don’t panic; the Janome 644D has a built-in illustration showing you step-by-step how to thread your machine.

Things You'll Need

  • Janome Serger 644D
  • 4 thread spools
  • Tweezers
  • Scissors
  • 4 thread nets
  • Threading illustration

Prethreaded

Place thread spools on the spool pins located at the top rear of the serger. Place the thread nets over the spools. Pull the threads from the spools and tie each spool thread to its corresponding upper looper, lower looper, and left and right needle threads.

The Janome Serger can use three or four thread spools.
The Janome Serger can use three or four thread spools. (Image: thread image by Andrius Grigaliunas from Fotolia.com)

Raise the presser foot. Gently pull the threads through the serger until the knots are visible near the presser foot. Stop drawing the needle threads when you see the knots in front of the needle eyes. Cut the knots and thread the left needle, then the right needle.

Gather all four threads. Pull the threads under the presser foot and toward the back of the serger, making sure to clear the needle plate.

Always remember to raise the presser foot before threading.
Always remember to raise the presser foot before threading. (Image: sewing image by Yury Shirokov from Fotolia.com)

Not Prethreaded: Replacing a Broken Thread

Turn off the power switch and unplug the machine. Raise the presser foot and pull the thread chain out toward the back of the presser foot. Cut the chain and separate the threads.

Review the illustration inside the looper door. Locate and replace the broken thread using the illustration as a reference.

Turn the hand wheel toward you until the needle comes to its highest position. Pull approximately four inches of thread away from the presser foot and toward the back of the serger. You are now ready to sew.

The hand wheel is located on the right side of the serger.
The hand wheel is located on the right side of the serger. (Image: sewing machine image by styf from Fotolia.com)

Threading the Lower Looper

Raise the presser foot, then place a spool of thread on the first spool pin on the right. Pull the thread from the spool, through the thread guide and holes, working from back to front.

Serger needles can be different from sewing machine needles.
Serger needles can be different from sewing machine needles. (Image: sewing machine needles image by Alison Bowden from Fotolia.com)

Hold the thread at both ends and tug gently to ensure the thread is correctly inserted between the tension discs. Guide the thread through the looper thread guide located above the looper compartment.

Using the green illustration inside the looper cover, thread the lower looper. Draw approximately four inches of thread through the hole on the lower looper and toward the back of the serger.

Sergers do not have bobbins or bobbin cases.
Sergers do not have bobbins or bobbin cases. (Image: sewing in purple image by robert mobley from Fotolia.com)

Threading the Upper Looper

Raise the presser foot. Place the thread spool on the second spool pin from the right. Pull the thread through the holes and thread guide.

Hold the thread at both ends and tug gently to ensure the thread is correctly inserted between the tension discs. Guide the thread through the looper thread guide located above the looper compartment.

Using a high-quality thread will keep it from breaking.
Using a high-quality thread will keep it from breaking. (Image: spool of thread image by Kathy Burns from Fotolia.com)

Using the red illustration inside the looper cover, thread the upper looper. Pull approximately four inches of thread through the looper hole and toward the back of the serger.

After threading, always pull at least four inches of thread to the back of the serger.
After threading, always pull at least four inches of thread to the back of the serger. (Image: ruler image by TRIPHOTO from Fotolia.com)

Threading the Right Needle

Raise the presser foot. Place the thread spool on the second spool pin from the left. Draw the thread through the holes and thread guide.

Hold the thread at both ends and tug gently to ensure the thread is correctly inserted between the tension discs. Using the blue illustration inside the looper cover, thread the right needle.

Raise the needle to its highest point and pass the thread through the needle bar thread guide from right to left. Thread the left needle from front to back and pull the thread approximately four inches from the eye of the needle to the back of the machine.

Always thread serger loopers going from right to left.
Always thread serger loopers going from right to left. (Image: sewing machine image by Paul Hill from Fotolia.com)

Threading the Left Needle

Place the spool of thread on the left spool pin. Draw the thread through the holes and thread guide.

The foot pedal should be unplugged before threading the serger.
The foot pedal should be unplugged before threading the serger. (Image: button machine image by morsted from Fotolia.com)

Hold the thread at both ends and tug gently to ensure the thread is correctly inserted between the tension discs. Using the orange illustration inside the looper cover, thread the left needle.

The left needle illustration is orange.
The left needle illustration is orange. (Image: Spools of thread image by Roman Sigaev from Fotolia.com)

Raise the needle to its highest point and pass the thread through the needle bar thread guide from left to right. Thread the left needle from front to back and pull the thread approximately four inches from the eye of the needle to the back of the machine under the foot.

Tips & Warnings

  • Read the user's manual completely before attempting to thread a serger, and familiarize yourself with the threading illustration found inside the looper cover.
  • Never thread the machine while it is plugged in and turned on as the cutting blade in the machine may cause injury.

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