Lower upper knife warning when knife is already lowered

SOURCE: Drawing up the lower thread

Check the needle to be sure it is installed with the flat side to the back of the sewing machine.

SOURCE: I have a white sewing machine Model 622 Serial

You can purchase that instruction manual here:
http://www.sewingpartsdirect.com/white-model-622-instruction-manual.aspx

Hassy

• 1388 Answers
• Posted on Feb 03, 2008

SOURCE: Machine not sewing

Make sure you have threaded the machine from right to left, it sounds like the needle thread is trapped under the lower looper thread and cannot form a stitch.........start the threading over from scratch like this:

1. Lower Looper
2. Upper Looper
3. Left Needle
4. Right Needle

SOURCE: white speedylock 7340 loose/missing stitches, up.looper unthreads

All tensions should be on 4. Also, make sure the threading is done correctly. Or if you wish; You can contact me on other sergers for sale. "Best prices guaranteed"! [email protected]

SOURCE: I have a Sapphire 835,and

Hi

Loops on the bottom of the fabric = inadequate top tension
Loops on top of the fabric = inadequate bottom tension. this is probably a tension problem. there is a discrepancy between top and bobbin thread tension. The looping is a too loose tension in the bobbin or too tight a tension on the top thread. in either case, and regardless of cause, the two are out of synch. Try adjusting bobbin tension according to your machine type. after adjusting the bobbin tension sew on a piece of scrap. use a medium sized stitch. check and adjust and test until you are satisfied. If the looping isn't severe, adjust top string tension slightly looser.

Here are other causes for this problem, but they are more unusual and should be considered only if the common remedies don't answer.

If it's the bottom thread, the bobbin isn't wound or loaded correctly, or it's the wrong bobbin. Check to see the bobbin fits in the bobbin case properly. Don't mess with the bobbin tension unless you have to. If the machine had been working before and is not now, the problem is most likely not in the bobbin tension. The adjustment range is really tiny, and it's easy to mess it up.If it still loops after you redo the bobbin, you might also check the parts around the bobbin. Clean up all the fuzz that had collected around the bobbin. Remove all fragments of thread and fuzz with brush and vacuum (don't use compressed air or canned air or blow -- it pushes fuzz farther into the machine where you can't get to it.) Pay special attention to the area around the feed dogs and the sewing hook area.
Lubricate the machine according to the manual's instructions if the manual describes using oil.

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