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The needle never moves forward/back on its own for most sewing machines. The needle bar goes up and down. The fabric moves due to the action of the feed dogs. First remove the fabric from under the presser foot. Check for tangled thread wrapped around the feed dogs or fabric/thread going down into the bobbin area in a tangle. Next check if the feed dogs are up. (When the feed dogs are down or covered (on some machines), the machine is in darning mode. The fabric will only move if you move it yourself.) With the fabric out of the way, rotate the hand wheel and check if the feed dogs are moving. Open up the bobbin compartment and clean out any lint, thread or other debris that may be tangling the mechanism. Take off the throat plate and check the feed dogs. A damaged throat plate can stop the feed dogs from moving properly. You may need to replace the throat plate.
For some machines, you may need to make sure that the unit is not in bobbin wind mode. This is usually obvious since the needle bar won't move either.
Have you got a tangle under your fabric? If so, release the fabric and rethread your machine, making sure the foot is up during threading. Otherwise check the feed dog under the foot. There's usually a switch somewhere that brings the feed dog up or down. If it's down the fabric won't feed. Another point, what type of fabric are you sewing. If it's leather or leatherette you'll need to use a roller foot. Hope this helps.
Is the feed dog raised into sewing position and not dropped as for darning? Feed dogs need to be in the raised position in order to pull the fabric through the machine.
If the stitch length is set too short, it will cause the fabric to barely move thereby causing the machine to stitch in one place.
Raise your presser foot and gently rotate the handwheel and watch the feed dogs. Do they rise when coming to the front of the machine, move toward the back of the machine, drop down below the needle plate, and move forward to the front of the machine again? If so, the feed dogs are working properly.
If the feed dogs never rise, they are in the dropped position for darning or free motion quilting when you would move the fabric manually.
If, on the other hand, the feed dogs do not move at all, then they are seized and you should probably get your machine serviced.
1) too thick for the feed dog to move the fabric forward need; lighter tension
2) are the upper and lower threads the same kind of thread?
3) is the thread feeding properly from above? sometimes the spool can snag the thread causing the tension to jump and skip stitches
Check to see what pattern is selected. Be sure it isn't the buttonhole.Select straight stitch.Move the stitch length setting to 4.Turn the handwheel and see if the feed dogs move forward. Press the reverse lever and see if they move backwards. Select straight stretch stitch and turn the wheel to see if the feed dogs move forward and backward.Check the presser foot release on top of the machine and make sure there is pressure on the foot. Sometimes the reverse assembly on this machine stops working because it has the wrong type of grease on it and it turns into a hard gummy mess that won't let it work. sewman7