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Re: BOTTOM THREAD KNOTTING UP
Check that it is threaded correctly (both top and bottom) making sure that the upper thread is in the takeup lever. Watch the needle as you slowly turn the handwheel counter clockwise (toward you) and the needle point touches the fabric (make sure presser foot is down). Is the thread still relatively taunt? If it is loose, the upper thread tension unit does not have enough tension. Check the areas where the thread goes and make sure you remove any loose threads or fluff which could be inhibiting the tension discs from closing over the thread. If the tension unit still is not tightening enough, the tension unit may need to be replaced or the circuit board replaced. If everything is ok in the upper thread area, now look at the bobbin area. With no fabric, watch as the needle enters the bobbin area. Does it go down and the upper thread catch the bobbin thread and pulls it to the surface? Check for anything preventing the bobbin thread from being pulled up to the surface through the needle plate. If you have still not been able to resolve the problem suggest you take it to an authorized husqvarna viking dealer for service. You can locate a dealer near you by visiting the husqvarna viking website and clicking on the Dealer link on the left-hand side of the page - http://www.husqvarnaviking.com Good luck.
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The carrier and bobbin are removed. Place the thread in the carrier with the thread dispensing counterclockwise. Place the thread between the metal pieces (tension). let the carrier hang from your finger and bob it slightly. It should extend one inch. If it doesn't then you can adjust it by turning the small screw slightly until it does what I said. Now, replace this assembly. The top tension you can start at three. The sewing should be an even pull between the upper and lower thread. If the thread knot is in the center of the material it is right. If the knot is under the material then raise the upper tension. If the knot is on the upper material then you should lower the upper tension. The key is to start with the bobbin tension correct and adjust the upper tension until the knot is in the center of the fabric
knotted up thread under the material indicates that the needle thread tension is incorrect ( needs tightening)
once you have that correct the material, will feed normally
use scrap when adjusting and the correct tension is when the top and bottom threads meet at the join ( middle -center )of the materials being sewn
1. Do you mean that there are knots in the bobbin thread?
2. Is the bottom thread in your stitching looping and knotting.
If yes to 1. you need to rewind your bobbin fresh, and keep slight tension on the thread reel that you are winding it from. Put the handle of your scissors into the top of the reel to apply a gentle pressure while winding. Keep your eye on the bobbin as it winds and give it a nudge with a finger tip to ensure it winds the bobbin evenly top, middle and bottom.
If yes to 2, then you need to check your bobbin threading, is the thread even under tension. Is the bobbin tension set correctly. Break out your manual and revisit this to ensure it is set correctly.
You would pull out several long lengths of matching thread from my spool of thread and knot the threads together at one end (to hold them together). Grab the knotted end of threads with your left hand and place the threads(held taunt together) under the presserfoot of your sewing machine.
Select a narrow zigzag stitch that will zigzag over the threads, and holding both the knotted end(Left hand) and the other ends with right hand( holding tauntly), zigzag down the length of the threads.
You can use this for matching button loops, cording for belt loops, or whenever you need matching cord. The thickness of the cord will depend on how many strands of thread you want to use. You insert the loop of cord into the seam, so that when the garment is turned RIGHT SIDE OUT, the loop will be sticking out of the seam and you can put the button through the loop.
Recheck the top thread and bobbin tension for equal balance of thread when sewing. The knotting of thread problem is usually because the tensions are too tight or too loose and/or thread may not be properly threaded. Another reason is when the bobbin thread is wind imbalanced it will cause the thread to knot-up when sewing. This problem is notorious when the bobbin is winded within the bobbin case on some machines. The bobbin thread need to be wind smoothly in the bobbin to avoid this problem.