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Make sure your feeddogs are up. That is the little jagged looking plate under the pressure foot. There should be a setting on your machine that will move it up and down.
If they are up then the bobbin is not in correctly. If it is a normal round bobbin that fits in a bobbin case, hold the bobbin in front of you so that the thread end is on top and the thread is going away from you, and slide it into the bobbin case. Feed the thread through the right openings in the bobbin case. When you pull the thread end the bobbin should turn clockwise.
Never hand-wind bobbins. Instead, use the accompanying bobbin winder which is attached to most machines,bobbin casings must be oiled regularly to prevent problems with the bobbin turning properly. The bobbin, when inserted properly into the bobbin casing, should spin counter-clockwise when thread is pulled.
Check the way your machine is threaded. Completely un-thread your sewing machine and re-thread it. Remember to always thread your machine with the presser foot up.
Check the bobbin and be sure the bobbin is threaded correctly and that the bobbin case is correctly threaded. Be sure the bobbin is in the bobbin case in the correct direction.
Always watch for bobbin wear, especially on the plastic type of bobbins. If the edges of the plastic are showing abrasions, the size of the bobbin has changed and may be the culprit. Although the size change is minute, it allows the bobbin to wobble in the case and changes the tension.
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