Threading the bobbin on a Janome is a five-step process that takes about two minutes once you know where each part sits
The bobbin is the small spool that holds thread underneath your fabric and works together with the top thread to form a stitch. On a Janome, threading the bobbin means winding thread onto an empty bobbin, then placing that wound bobbin into the bobbin case so it feeds thread correctly. The steps are the same whether you own a Janome mechanical model or a computerized one—the parts are in the same place and work the same way.
You will need an empty bobbin (plastic or metal, depending on your model), thread, and your machine's bobbin winder, which is built into the machine. Most Janome machines come with several bobbins in the box; if you have lost yours, Janome sells replacements by model number, and generic bobbins work on most machines.
Key Takeaways
- Wind thread onto the bobbin using the winder on the side or top of your machine, then place the wound bobbin into the bobbin case under the needle plate.
- Thread the bobbin case by running thread through the tension spring slot, then through the bobbin case opening, so the thread sits in the groove.
- Leave a 6-inch tail of thread hanging from the bobbin case before you close it and lower the presser foot.
- If stitches look loopy or uneven, the bobbin thread is usually the culprit—rethread it and check that the bobbin case is seated all the way in.
Winding thread onto the bobbin
Start with an empty bobbin and place it on the bobbin winder. On most Janome machines, the winder is a small post on the right side of the machine (on mechanical models) or the top right (on computerized models). Slide the bobbin onto the post until it clicks or seats firmly.
Bring the thread from your spool up and around the bobbin winder tension guide—a small metal or plastic piece near the post. This guide controls how tightly thread winds onto the bobbin. Thread the end of the thread through the bobbin winder guide, then wrap it around the bobbin two or three times by hand to anchor it.
Press the foot pedal or press the start button (depending on your model) and hold it steady. The bobbin will spin and wind thread automatically. Stop when the bobbin is full—most machines have a sensor that stops automatically, or you will see the bobbin is nearly full and the thread is wound evenly across it. Do not overfill; thread should not bulge past the bobbin edges.
Cut the thread and remove the bobbin from the winder. Set the wound bobbin aside.
Inserting the bobbin into the bobbin case
Raise the presser foot (the metal piece that holds fabric down). This is important: raising the presser foot opens the tension discs inside the machine, which allows you to insert the bobbin case. If the presser foot is down, the tension discs are closed and you cannot fit the bobbin case in.
Locate the bobbin case. On most Janome machines, it is a small metal or plastic housing directly under the needle plate (the flat metal plate with the needle hole). You may need to remove the needle plate first by unscrewing it or sliding it out, depending on your model. Check your manual for the exact location on your machine.
If your bobbin case is removable (which it is on most Janome models), gently pull it out. If it is built in, you will thread the bobbin while it is in place.
Threading the bobbin case
Hold the wound bobbin with the thread tail pointing to the left. Insert the bobbin into the case so it sits flat and the thread unwinds counterclockwise. The bobbin should spin freely inside the case.
Take the thread tail and guide it through the tension spring slot—a small notch or opening on the side of the bobbin case. The thread should sit in this slot so the tension spring holds it lightly. Then guide the thread through the bobbin case opening (the slot where thread exits the case) so it lies in the groove. Leave about 6 inches of thread hanging out.
If your bobbin case is removable, slide it back into the machine until it clicks or seats fully. You should hear or feel a click. If it does not seat all the way, the bobbin will not feed thread correctly and your stitches will be loose or uneven.
Closing the bobbin area and testing
Replace the needle plate if you removed it. Lower the presser foot. This closes the tension discs and holds the bobbin case in place.
Hold the top thread (the thread coming from the needle) and gently pull the bobbin thread tail. You should feel slight resistance as the top thread pulls the bobbin thread up through the needle plate. This is normal and means the two threads are ready to lock together when you sew.
Sew a few stitches on scrap fabric to check that both threads are feeding evenly. If the top thread looks loopy or the bobbin thread is not feeding, rethread the bobbin case and make sure it is seated all the way in.
Common bobbin threading mistakes
The most common error is not raising the presser foot before inserting the bobbin case. If the presser foot is down, the tension discs are closed and the case will not fit. Always raise the presser foot first.
The second mistake is threading the bobbin case backwards—winding the thread clockwise instead of counterclockwise. The thread should unwind from the left side of the bobbin as it spins. If you wind it the wrong way, the thread will not feed smoothly and tension will be wrong.
A third mistake is not seating the bobbin case all the way in. If it is not clicked in fully, thread will not feed at the right tension and stitches will look loose. Push it in until you hear or feel it click.
When to rewind or replace the bobbin
Rewind the bobbin when it runs out of thread—you will see the bobbin is nearly empty or thread stops feeding. A full bobbin usually holds enough thread for 20 to 40 minutes of sewing, depending on stitch length and density.
Replace the bobbin if it is cracked, bent, or the thread catches on it as it unwinds. Plastic bobbins can crack if dropped or if thread is wound too tightly. Metal bobbins last longer but can dent. If you see damage, switch to a new bobbin rather than trying to repair it.
Keep at least two or three wound bobbins on hand so you can switch colors without rewinding every time. Many sewers wind several bobbins at once and store them in a small container.
Frequently Asked Questions
What if the bobbin thread keeps breaking while I sew?
Broken bobbin thread usually means the bobbin case is not threaded correctly or is not seated all the way in. Rethread the bobbin case, making sure the thread sits in the tension spring slot and the case clicks into place. If thread still breaks, check that the bobbin itself is not cracked or bent.
Can I use a metal bobbin instead of plastic on my Janome?
It depends on your model. Some Janome machines use only plastic bobbins, while others accept both. Check your manual or the bobbin case itself—it usually says which type to use. Using the wrong type can cause tension problems or damage the bobbin case.
How tight should the bobbin thread be wound?
Wind the bobbin until it is full but not bulging. Thread should cover the bobbin evenly from one end to the other without piling up or leaving gaps. If you wind it too tightly, thread may break; if too loosely, tension will be uneven.
Do I need to rethread the bobbin every time I change the top thread color?
No. You only need to rethread the bobbin when it runs out of thread or when you want to change the bobbin thread color. The bobbin stays in place and threaded until you remove it.
Why does my machine say to raise the presser foot before threading?
Raising the presser foot opens the tension discs inside the machine. These discs grip the top thread to control how tight or loose stitches are. When the presser foot is down, the discs are closed and you cannot insert the bobbin case or thread the machine properly.