I think you mean the shuttle is not picking up the top thread. There are many reasons why this can happen. The best way to find out which is to leave the cover off the bobbin compartment and turn the machine slowly by hand while watching things happen for a few cycles - best to have a piece of material in place as well (but not in your line of sight).
As the needle begins to rise, the top thread should form a loop for the shuttle to pick up. If no loop forms, the needle could be too fat for the thread, the thread could be sticking to the needle, the pick-up arm could be out of time (unlikely), or the thread tension could be wrong (or the machine not threaded correctly).
If a loop forms, but the shuttle does not pick up up, the needle could be bent (take it off and roll it on a flat surface),or in backwards (loop forming opposite to shuttle), or the material (or your manner of feeding it) causing the needle to be deflected away from the shuttle. On some machines, it is also possible to loosen a clamp and move the shuttle closer to the needle, but obviously that is a last resort (unless it has come loose or been forced away).
There are other possibilities, but usually it's the simplest thing. Try changing the needle?
Sorry, I say shuttle - I mean hook, of course. (Forgetting how to speak English.)
If the needle is correct (length and size) and true (straight) and the right way 'round, the timing of the machine has not changed, and everything is clean and lubricated, you would think it should sew. Hope you can examine it closely, and get to the bottom of the problem.
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Generally, this is because the needle
is inserted wrong or because it's bent. In the first case, the top
of the needle (called the shank) has a flat side-this has to be
inserted so it faces the back or away from you.
In the second
case, when a bent needle stops the top thread from picking up the
bobbin thread. Even if you think your needle is fine, change it to
see if this solves the problem.
Generally, this is because the needle
is inserted wrong or because it's bent. In the first case, the top
of the needle (called the shank) has a flat side-this has to be
inserted so it faces the back or away from you.
In the second
case, when a bent needle stops the top thread from picking up the
bobbin thread. Even if you think your needle is fine, change it to
see if this solves the problem.
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