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I suspect the bobbin thread has escaped its tension spring. If you give the bobbin thread a quick short tug and the bobbin spool spins then likely the thread is not behind the tension spring. This usually causes hook jam but not always.
First be sure you have threaded per machine instructions... see below.
Next turn handwheel and position needle at the high point of stroke (always when loading bobbin). Remove and re-insert bobbin. Now, to be sure the bobbin thread is fully positioned behind the tension spring, before you move the bobbin thread into the notch, place your right index finger on top of the bobbin spool to prevent the bobbin spool from turning. Hold thread snugly (in slight tension) as you move it towards the back of the notch. You should feel the thread slide in place behind the spring. Let loose the spool and lightly pull thread. Note the resulting change in tension. (don't forget to set top thread tension back to a more normal setting)
Re-check your stitch sample. Pull on the loopy thread. Is it really the bobbin thread, or is it the top thread looping under the fabric? FWIW, stitch problems appearing under the fabric are usually top thread issues, stitch problems on top of the fabric are usually bobbin related.
You can try this on both of your machines to see if it makes a difference.
Be sure to install a brand new needle. Remove the top thread completely from the machine. ALWAYS RAISE the presser foot and rethread from the beginning. Make sure the thread path is correct. Set the top tension to the midway point and retest your machine.
If the top thread is showing under the fabric, tighten the top tension, If the bobbin thread is showing on the top of the fabric, loosen your top tension. The perfect tension is when the two threads meet in the middle of the fabric.
www.manualslib.com > ... > MEMORY CRAFT 4900 QC > User manual Janome MEMORY CRAFT 4900 QC Manual Online: Balancing Thread ... Auto-threadtension When the thread tension dial is set at AUTO for ... to increase the threadtension. ... Sewing Machine Janome Memory Craft 350e Instruction Book.
1)Check that your bobbin does not have a nick in it where the thread can catch and won't feed smoothly.2) make sure the upper and bobbin threads are the same.3) pull out the bobbin case and chect to see if there is a clump of lint.4) make sure the feed dogs are moving the fabric through smoothly,some fabrics can get caught on the dogs and make the bottom thread get loopy.5) check your needle,if it's bent or has a bad tip,it can mess up the stitch.
Most likely, the bobbin thread is not in the bobbin tension. Rethread the bobbin and try again.
Loops on top of the fabric almost always mean too little tension on the bobbin thread; loops on the underside almost always mean too little tension on the top thread. Just backwards of most people's first guess. See http://www.picturetrail.com/sfx/album/view/22521551
if you've taking the machine in 4 times to be fixed,,sounds like you need a different sewing machine repair shop. have you tried changing needles? have you tried rethread the top & bobbin thread is it possible the bobbin thread in not correctly inserted in the bobbin case? try a top thread tension of 5 & see what happens?
No, I have not had a consistent problem with this.
What looks like a bobbin issue could be a threading issue.
If a sewing machine is threaded with the presser foot down, the tension control does not capture the thread as it should. The top thread then cannot form a proper stitch with the bobbin thread.
If I forget to have the presser foot up when I thread, then I get loose stitching on top and loopy stitches on the bottom.
Set the top tension as recommended by the mfg - this is usually between 3 - 6.
Now re-thread the machine with the presser foot up and see if this doesn't eliminated the loopy stitches.
What appears to be an issue with the bobbin may actually be the top thread was not seated into the tension during threading and the tension cannot control the flow of thread to the needle and you get a loopy stitch.
Keep the bobbin case clean as built-up lint can cause stitching problems.
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