If this is an older metal mechanical machine, it may be seized due to lack of oil.
Wheel on right side that controls the needle up and down is very tight...
SOURCE: Bottom thread will not catch
Unplug the machine and remove the needle plate so that the bobbin case if fully exposed. Lift out the bobbin case and the cup that it sets in will be visible. Locate the "hook" on this cup. It is a finger with a sharp point at the upper edge of the cup. The hook is what grabs the thread from the needle while sewing.
If the hook passes by the needle AFTER the eye of the needle is above it, you timing has slipped and the machine must be taken in for repair.
If the hook catches the thread from the needle, put everything back together and try threading again.
SOURCE: kenmore 12 stitch sewing machine-wont sew
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SOURCE: Brother CS-6000 Sewing Machine - Jam
I had the same problem.. I think the bobbin used in this machine is no good I replaced mine.. It cost alot too.. but now I do not have any problems.. good luck
SOURCE: balance wheel is totally jammed
machine was working fine when suddenly it just jammed up. Everything seems to be fine, but the balance wheel is completely jammed rigid. I've looked at the shuttle and there are no thread jams at all. The needle moves fine from side to side with different stitch selections, but wont go up and down with the wheel.
I have tried looking in the machine, but I can't find any thread jammed.
SOURCE: while sewing the bobbin case moves, wheel locks up, needle locks
Im not sure if this will help but thought I would pass it along. My Pfaff 6122 tells me to check bobbin for thread unrolling clockwise before you place it back in the machine. I had mine turned to un roll counter clockwise, this is wrong, the bobbin will fall out when you pull on the thread while you are holding it in your hand. You may just keep putting it in backwards. Hope this works for you. J.R.
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