Seems like the same problem I haad so I tried changing the needle looking for burrs or bent needle. maybe a piece of broken needle in the bobbin holder. or maybe the fabric requires a certain needle or the needle size is too big for the fabric you are using. or the machine needs cleaning I have started using canned air for this. and then if this fails then you should note the tension position and then try adjusting it one point at a time. always puting it back to where it was to start with good luck
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According to the manual, you should not need to adjust the bobbin tension (and I located other sites which stated the bobbin tension cannot be adjusted on this machine). Apparently, all the tension adjustment is accomplished through the upper thread::
"EN Thread Tension Upper thread tension Basic thread tension setting: "4". (1) To increase the tension, turn the dial to the next number up. To reduce the tension, turn the dial to the next number down. A. Normal thread tension for straight stitch sewing. B. Thread tension too loose for straight stitch sewing. Turn dial to higher number. C. Thread tension too tight for straight stitch sewing. Turn dial to lower number. D. Normal thread tension for zig zag and decorative sewing. Correct thread tension is when a small amount of the upper thread appears on the bottom side of fabric. Lower thread tension The bobbin tension has been set correctly at the factory, so you do not need to adjust it. Please note: - Proper tension setting is important for strong seams. - There is no single tension setting appropriate for all stitch functions, thread or fabric. - A balanced tension (identical stitches both top and bottom) is usually only desirable for straight stitch construction sewing. - 90% of all sewing will be between "3" and "5". - For zig zag and decorative sewing stitch functions, thread tension should generally be less than for straight stitch sewing. - For all decorative sewing you will always obtain a nicer stitch and less fabric puckering when the upper thread appears on the bottom side of your fabric. 1 A B C 22 D"
Doing further research, I found this statement on a machine review site:
"After reading reviews online from where I've bought my drop-in bobbin machines, I think many of the negative reviews are due to the bobbin thread coming up without laying across the bobbin. It can cause the stitches to look very sloppy and no amount of tension adjusting can fix the stitches."
There are several machine review sites wherein 4423 owners stated their disappointment in the 4423's performance. Some said the machine failed almost immediately and others said the machines developed problems when sewing heavy fabric.
You may have a burr from an errant needle strike on your bobbin case or even on the bobbin itself. Check to see if there are any rough spots on or around the bobbin.
If you don't find anything, you may want to remove the bobbin assembly and clean the lint out from the lower assembly. Sometimes the smallest amount of lint or pieces of thread can cause problems with the bobbin.
You didn't mention if the tangled thread happens on the top or the bottom of the fabric. If it is on top, then it is a bobbin issue. If it is on the bottom, then it is an upper tension/thread issue.
Try removing the bobbin, thread, and needle. Rethread the entire machine using a different bobbin and a new needle. This may solve your problem. Good luck!
I would start by re winding your bobbin and making sure that it is done though all the correct tension loops. A bobbin that is wound to tight or loose can cause all sorts of problems. If that has been done then completely rethread the machine from scratch. Now go through and check all your tensions, it sounds like the bobbin tension is too loose and your stitch tension is too tight. Adjust and try again.
Have you taken the bobbin out and made sure there is nothing caught in the bobbin race area. Maybe even unscrew the plate and take the whole bobbin race assembly apart and clean well. Once that is done put back together then re thread machine. Next I would start by hand turning the machine and doing some stitches slowly with the fly wheel make sure to to forwards only never turn the fly wheel back wards. If everything seems clear give it some power slowly and see how it goes.
The noise is because the machine is trying to raise or lower a needle and can't move. Several things to check. Did the needle break and jam in the bottom thread? Is the needle bent or jam? Did the thread jam in the bobbin area? I had a 'knot' of thread build up on the bottom and it hooked itself into the metal clip on the bobbin so that the needle couldn't raise. If thread jams in the bottom carefully cut the threads until you can free the hoop and material. Then check to make sure all pieces of thread and fuzz has been removed in the bobbin case. If it happens again check to see if the bobbin case or the throat plate is scratched or bent. If you are stitching Free Standing Lace on this machine or a piece with over 20,000 stitches I recommend starting with a new full bobbin and a new needle. As you get toward the bottom of the bobbin, thread seems to have a high likelihood of tangling or looping.
Several things to check. Did the needle break and jam in the bottom? Is the needle bent or did it jam in the bobbin area? I had a 'knot' of thread build up on the bottom and it hooked itself into the metal clip on the bobbin so that the needle couldn't raise. If thread jams in the bottom cut the threads until you can free the hoop and material. Check the bobbin for pieces of thread and fuzz. Check to see if the bobbin case or the throat plate is scratched or bent. If you are stitching Free Standing Lace on this machine or a piece with over 20,000 stitches I recommend starting with a new full bobbin and a new needle. As you get toward the bottom of the bobbin, thread seems to have a high likelihood of tangling or looping and will cause a jam which means the handwheel locks.
try a new needle--one that is for the fabric being sewed then try to adjust the top thread tension again, if the stitches remain loose and the tension won't adjust then the tension knob needs to be checked to see if there is something wrong with it. also check to make sure the bobbin is inserted correctly into the bobbin case, if the bobbin is not turned the right way in the bobbin case the sewing machine will not stitch correctly.
Your description isn't very clear. When you say the "bottom stitch is using too much thread" Do you mean you see lots of loopy threads on top of the seam? Or do you mean you see loops on the bottom under the fabric? If your loops on the bottom, that means the top tension is too loose, you've not remembered to put the presser foot down, you have not threaded the top thread properly... Start by rethreading carefully with the presser foot UP. Then do a test stitch, remembering to put the presser foot down. If you still get loops underneath... tighten the tension.
If your loops are on the top of the fabric. loosen the top tension... then do a test seam... and if you still have loops loosen again and repeat. If you start to see loops on the bottom... tighten the tension a bit.
try changing the needle adjust the top tension one number or letter higher till the stitch looks normal clean under the needle plate & in the bobbin area for lint make sure the bobbin is not warped make sure the bobbin is inserted correctly into the bobbin case try rethreading the machine top & bobbin it's also possible that the machine could be out of time & needs to be checked at a repair shop
Start from the begining. Use your Instruction Book and make sure the machine is threaded correctly. Put in a new needle. Adjust the top tension to about halfway. Fit a fresh wound bobbin that does not have all sorts of different threads still wound on it(a bad habit with a lot of people). Make sure the bottom tension is correct. Make sure the bobbin is fitted corectly. Set the machine to do basic straight stitch(mid range stitch length). Try sewing and see if the problem is solved.