I have re-threaded the bobbin a dozen times and am pretty sure I did it right, adjusted the tension, etc. The machine jams at the bottom, the top thread does not pick up at the bottom and I end up with a clump of bottom thread under the material.
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1. Clean up any loose thread in the bobbin area.
2. Pull on the bobbin thread while it is out. It should give a tension that is equal to the top tension of three. You'll have to approximate. Adjust the screw tension on the bobbin. It is the screw nearest to the thread exit hole on the side.
3. Put it back in.
4. Now, the top tension should be at about three. If it still allows a little wad on the bottom of the fabric you can adjust the top tension by tightening a small amount and monitor each time you adjust. The wad should go away.
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.
Make sure your bobbin is the right size. If it is too high it won't turn freely. Also, make sure you drop the bobbin in so it rotates clockwise. The tension must adjusted by hanging the bobbin from your hand and bob it up and down gently. It should move about one inch downward once adjusted properly. The hole in your plate should be checked to ensure the center where the thread dispenses is smooth. Use a finger nail file to smoothen if needed. Now, adjust the top tension to four. You may need to adjust just slightly. Just remember when you remove the bobbin assembly to put a drop of oil on the race. (Many forget this). When you rotate the handwheel towards you the bottom thread should come up. If this doesn't happen then you will need to have adjustments made.
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.
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.
Hi! The bobbin tension rarely needs to be adjusted. First, make sure you're using the appropriate size needle and thread for your fabric (I'd probably use either a 'denim' needle or a universal size 14) and also that the upper thread and bobbin are threaded absolutely correctly. These can throw off the tension! Also, take the time to clean out the bobbin area. That can throw your stitch off also.
If the stitch on the bottom is loose, so that you see the top threads, then the top tension is too loose. If the top stitch is too loose and you see the bobbin threads on top, then the top tension is too tight.
It helps to thread the machine with different color thread on top and in the bobbin, and then stitch an inch or so on the same type of fabric as you're using in your quilt. Check the stitch. If you need to adjust the top tension, make sure the pressure foot is down! Adjust a little, stitch a few inches, and check again. Repeat until you don't see any (or very little) bobbin thread on the top or top thread on the bottom.
If you go through all these steps, and the bobbin thread is still loose (and you've tightened up the top tension), then there is a tiny little screw on the side of the bobbin case that you can use to adjust the bobbin tension. Turn the screw just a little bit (less than a quarter turn), stitch, check, etc. Once the bobbin tension is set, you shouldn't ever have to change it.
take the bobbin out check for debris (pieces of thread, lint, etc.) that may be jamming the bobbin. check under the feed plate for a thread jam or debris. check if your bobbin is wound too tightly. it can happen! then it will keep breaking. the other adjustments are mainly for thread tension- the spool on top. if they're too tight, the thread will keep breaking. you can tell- once they're properly adjusted- by the quality of the stitch. check the bobbin first! if it's too tightly wound, you can probably adjust the winding tension on top. try a different bobbin. if that works then 'rinse and repeat!'. good luck!
Hopefully you have a new needle in the right way and not a dull bent one. And are putting your bobbin in correctly so that when looking at the back of the bobbicase and when pulling the thread it turns clockwise. Counter-clockwise things like this will happen. Also that the foot is up when threading ensuring that the thread goes between the tension disks. Serious jam ups can also cause it to get out of timing which you may need a tech for.
When you see the bobbin thread on top of the fabric this can be on e of 2 things usually. 1) thath the top thread tension is too tight or that the bobbin thread loose. Remember the saying righty tighty, lefty loosey. If you have adjust the top tension and it has helped just not enough perhaps you need to try the bottom a small screwdriver to turn the little screw on the outside of the bobbincase may do the trick. only small adjustments 1/4 turn at the most at a time to the right to start with.