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I have a brother project runway limited edition sewing machine and there is a constant jam with the bobbin threading and I have cleaned it,removed the sewing plate and everything I can possibly think of. If the bobbin case is scratched would it cause the jam?

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Hi

The usual cause is that there is a problem with the upper threads, often it is not caught in the tension discs. When you thread the machine, make sure that the presser foot is raised - this causes the tension discs to open so the thread can seat itself properly.

Another possibility is that the thread isn't in the take up lever - the hook thingy that goes up and down. Sometimes the thread will just slip out.

Thanks

Posted on Aug 05, 2010

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1 Answer

I havd loose bobbin thread, but I also just went to a heavier thread.


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Hi I have a Janome 419S or 423S, the problem seems to be my hook race unit keeps getting loose and then the thread jams up. What can be done? Please


A jammed machine is caused by thread being caught in thehook. Remove the upper thread and the bobbin case, turn the hand wheel towardsyou (counterclockwise) by hand and remove any thread in the bobbin case area. Alwaysturn the hand wheel towards you. Turning the hand wheel away from you(clockwise) can cause the machines timing to become unaligned and jam yourmachine. Also, always make sure the presser foot is in the down position beforeyou start sewing. Sewing with the presser foot in the up position will jam yourmachine in the bobbin case. If youhave an older model sewing machine with a shuttle hook, then you can alsofollow these: 1. Disconnect the sewing machine from any power source.Loosen the thumb screw on the left side of the sewing machine body and removethe cover to expose the needle bar. This is the shaft that extends down andthat you attach a needle to for sewing. Open the shuttle race and remove the bobbinand bobbin case. 2. Turn the hand wheel toward you until the needle hasreached the lowest point of the stroke. The hook should be at the top of itsstroke inside the shuttle race. Loosen the set screw for the needle bar on theupper part of the machine, this is located on the needle bar bushing (thecollar that the needle bar slides through when making a stitch). The needle barshould slide easily up and down. 3. Turning the wheel again, adjust the position of the tipof the needle so that the upper part of the needle eye is just below the bottomedge of the hook inside the shuttle race. Once in position, re-tighten the setscrew on the needle bar bushing. Do not allow the needle bar to slip whiledoing this. 4. Replace the bobbin and bobbin case and close the shuttlerace. Thread and plug in your machine. Using a sizable scrap of cloth, sew aseam to check to see if there are any skips in the stitching. If there arestill skips re-adjust the timing again until you can sew without any skipped stitches. 5. When proper timing has been achieved replaces the coveron the needle bar and tighten the thumb screw. Hope this will help you. Good Luck.

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1 Answer

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Check to see if the bobbin is wound in the right direction. Check to see if the bobbin case area is free of lint and debris. Has it been a while since you last used it? Check to make sure it is threaded correctly by following the arrows if this is a newer sewing machine. Last. Thread direction through the needle can be wrong. Vikings usually thread front to back. If you recently changed a broken needle, it could have been replaced in the wrong direction. make sure the flat edge of the needle is fed into the corrosponding flat area inside the needle case. I hope this helps you!

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1 Answer

Excessive thread under fabric...jams up the machine. Have rethreaded, replaced needle, rewound bobbin...no difference. Sews a few stitches then under thread just gets jammed in machine. Viking 1100.


So the underside looks more like a **** rug? 2 things to try. The problem is the bobbin. try flipping the bobbin over (take it out, turn it over and put it back in). The writing on the bobbin printed in the plastic should be on the top and no writing on the underside. 2nd,make sure it's threaded front to back and not looped around the needle. I have the same machine~it did that too!

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1 Answer

I need a user guide for a Commercial Brother sewing machine model DB2-B716-403AB, I need to see how to thread it, and I need to see how the bobbin works(bobbin thread is not picked up by the neddle. And I...


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2 Answers

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2 Answers

I have the brother Ls-2000 sewing machine i threaded the top as well as the bobbin but when i try to sew the thread gets stuck and it bunches up and tangles in the bobbin. also the little bit that did sew...


adjust your tension.You probably did not wind your bobbin properly as well.Make sure you oil your machine every month or so and make sure your bobbin is seated properly before you sew.
Go slower with the pressure foot speed and use the right needle.ALWAYS test on scrap of your sewing material first!!!

I have this machine for like 2 years and can do 2-5oz cowhide and buffalo leather on it (no joke, and it works FLAWLESSLY) inside it has full steel construction,just needs regular oiling compared to pro machines and easily made a few grand $$$ with it while my pro machine is getting repaired (I don't even bother with my pro machine anymore) But you MUST oil it every month and use the RIGHT needle and adjust your tension properly
Also pull out the thread a good 6 inches from the needle and bobbin before dropping the pressure foot and sewing.
Best $70 bucks (WITH TAX) I spent hell,the leather I use costs more than the machine!

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2 Answers

My Kenmore sewing machine timing has gotten off. I am sewing a big upholstery project and it starting bunching thread from the bobbin. The thread is so heavy that I had to put some pressure just to get...


Hello

Disassemble your bobbin case which is realy quite easy, clean thoroughly with a brush and air, paying particular attention to any rust that may have formed, and any thread that may have weazeled it's way into small but very incremental areas of your case.

Make sure your needle is not in backwards.The rounded side should be on the outside

. If threading is correct and your tension is properly adjusted , then check the hook for scratches. If you have ever hit the hook with a needle, it will be scarred and will catch the thread every time the upper thread passes around the bobbin case. the hook is the sharp point on the shuttle that holds the bobbin case. If it is scratched, polish it smooth with VERY fine sand paper

Make sure that your thread arm that rises and falls, constantly having tension running through it and that it is in fact staying in place.

Alternate between the metal and plastic bobbins - sometimes the plastic bobbins tend to chip

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1 Answer

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open the bobbin case and see if the hook is turning, if it is it is just a timing problem with the hook and needle, if it isn't tuning you may have a broken gear or timing belt.....It eill need to be looked at or adj by someone who repairs them....Daniel

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