Question about Janome MyLock 644D

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What causes the MB4 to make loops about every fifth stich on the top of the garment?

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Double check the tension and make sure nothing is stopping the cotton reel from undoing smoothly

Posted on Sep 13, 2010

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Elma supermatic balls up under machine after a few stiches


Thread nests (also called bird nests).

Remove the top thread.
ALWAYS RAISE the presser foot and rethread from the beginning.


Birds nest under the fabric big loops of thread top side looks good...

What causes Bird Nests Superior Threads

Apr 23, 2017 | Sewing Machines

1 Answer

When i sew the underneath thread bunching up under garment I have tried all the trouble shooting on you tube, tried all different tensions still same results. Have a Taylor professional 834fb


the problem is the needle thread tension is not tight enough
tighten it up until there is a definite resistance when pulling the thread by hand

Apr 09, 2016 | Taylor Sewing Machines

1 Answer

My stiches are uniform but about every 12 stiches there is a long stich , can you tell me what is causing it?


try to decrease top thread tension a 1/4 notch
check with new needle (may be bent and hook is missing the thread loop)

Nov 10, 2015 | Sewing Machines

1 Answer

How can I fix the top stich


I like to adjust with 2 colors, then you know which is from the spool, and which one is from the bobbin.

Most bobbin shuttles have a small screw to adjust the tension.

It sounds like your upper thread is adjusted too tight, but only if the loops around it (from the bottom thread) are tight and small. If those loops around the top thread are loose, then you need to tighten the shuttle screw. ;)

I notice this happens to me if I change thread types, also if I sew different thickness of cloth on the same settings. I tend to adjust until the point of breaking thread, then loosen the top a teeny bit.

Sep 06, 2014 | Sewing Machines

1 Answer

Why is thread looping under fabric, looks great on top???


Tension is based on tightness of stich. Hold with two fingers and pull should only feel little resistance. Both top and bobbin tension should be eq

Aug 19, 2014 | Sewing Machines

1 Answer

Why does my Janome MB4 Jump in mid pattern and finishe 1" up or down?


This is usually caused by the y axis movement system. Occasionally this system can come out of sync, and cause the issue you described. Your y axis pulse motor may be going bad as well. In either case it would be best to take your machine to a Janome dealer for repair.

May 04, 2014 | Janome MB4 Four Needle Embroidery Machine

1 Answer

The top stich is loose on my Janome Harmony 8100, I have cleaned and changed bobbins, but nothing seems to help.


Ok, Let's understand exactly what is going on. You said. "the top stitch is loose." So that we are clear....do you mean that you are getting loops on top of the seam? Or do you mean that you are getting wiggly stitches on top and small loops on the bottom of the seam? It's important to know... Because loops underneath means the top tension isn't right. Maybe you didn't thread with the presser foot in the UP position... or your tension is dialed too low.

Now, if you are getting loops on top of the seam... that means the top tension is too tight. Loosen the top tension. Make sure your bobbin is inserted correctly. If loosening top tension isn't enough, you may have to tighten the tension screw on the bobbin case/ or bobbin carrier.

Feb 25, 2013 | Janome Memory Craft 9000 Computerized...

1 Answer

My singer sewing machine model # 774 will not produce a lower stich that is not all jumbled on the underside of the fabric. The upper stich is fine, it's the bobbin stich that comes out all jumbled. ...


Looping thread underneath is a top thread tension issue...

I have written a 5 page illustrated Tutorial on overcoming this problem....HERE


Nov 08, 2011 | Sewing Machines

1 Answer

Upper thread balls up on the bottom. Makes a matt on the underside of garment.


If your thread messes up on the bottom then the problem lie in the top threadinbg of the machine.. Some how it is not thru the tension wheel like it needs to be. FYI.. Loops on the bottom fix the top.. Loops on the top, fix the bobbin.

Apr 19, 2009 | Singer Sewing Machines

1 Answer

Singer 221-1 stitching is good on bottom but not on top


pucker is caused by too loose or, to tight adjustment of: the thread tensioners both the bobbin tensioner and, the needle tensioner need to be adjusted: to adjust the needle tensioner turn the side knob clockwise is tighter counterclockwise loosens; the bobbin tensioner is a tiny screw on the bobbin holder adjust both tensioners until your stich loops' both top and, bottom are tight but, the machine does not break the thread

Feb 16, 2009 | Singer Featherweight II 117

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