There should be a small flat screw on the bobbin case that needs to be adjusted - turn to the left very slightly to weaken or lessen the tension and turn to the right very slightly to strengthen or tighten the tension. there may be two little screws in the same place - on my bobbin case, the screw to turn is the bigger one and is closer to the thread opening. hope this helps!
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I am not sure about this particular machine but in most machines there will be a nob on the front loose low numbers like 0 1 -2 work well on number 3. If the nob is not on the front check and see if it is on the side.
It sounds like you have no tension on the bottom bobbin reel. Did you check your tension on the bobbin reel. The tension must be right on both sides. When pulling on the cotton when the reel is in its bobbin case you need to feel a little resistance. Adjust the tiny srew on the bobbin case to tighten the reel to avoid it to turn in the casing.
THE BOBBIN IS PLACED INTO THE HOLDER WITH THE THREAD IS GOING AWAY FROM THE SPRING, NOT TOWARDS IT. IT IS LIKELY TO TURN COUNTER CLOCKWISE. TAKE THE ASSEMBLY OUT AND PLACE THE THREAD INTO THE BOBBIN HOLDER JUST AS YOU WOULD WHILE IN THE SEWING MACHINE AND PLACE THE THREAD UNDER THE SPRING. ONCE IN THEN TRY CAREFULLY TO LET THE ASSEMBLY HANG. BOUNCE THE ASSEMBY DANGLE AND BOUNCE UP AND DOWN. THIS IS TO ADJUST THE BOBBIN TENSION. THE TENSION SHOULD ALLOW THE ASSEMBLY TO MOVE AROUND ONE INCH AWAY. YOU NEED TO ADJUST THE SPRING ACCORDINGLY. IF THIIS DOESN'T ACCOMPLISH FIXING THE PROBLEM THEN YOU WILL NEED TO HAVE YOUR TIMING GEARS AND BELTS CHECKED. THEY ARE ALLOWING THE TIMIING TO CHANGE IN A SHORT LENGTH OF STITCHES.
Every machine is a little different, but the basics are the same. Our 7th grade Home Eco. teacher taught us the first day... "...Start at the thread spool, thread guide, thread guide, tension, take up lever, thread guide, thread guide, needle. Learn this and you can thread any sewing machine"
she was right, As this hold true for my kenmore, juki, singer and new home machines. Same basics for industrial machines too.
1. make sure your machine is threaded right.2. set the tension between 3 and 4 and play with the tension as you need it to adjust it.3. make sure the bobbin is threaded right.make sure to visit the site below; it has solutions to multiple problems and instructions how to thread the needle or bobbin. Good luck.htt://Fix Looping/Knotting Thread Fix Knotting/Bunching Thread Looping Bunching & Knotting Thread
The bobbin should have a thin metal peice that the thread goes under to create tension, the screw closes to end the thread comes out of is the one to adjust. If they were sewing with a light thread on the machine the tension on the bobbin is probably set pretty tight loosen it a little at a time, turning the screw counter clockwise. You might need to check your top tension also if it is showing a knot on the bottom. The bottom is to tight or the top is to loose.
you have your thread tension too tight that's why it is pulling the bottom stitch all the way through it looks good from the bottom but not good on top. Its pulled the stitch all the way through the material. I had my own upholstery shop 18 yrs and tension gets you every time.Just loosen the top tension.