Change the needle. It sounds as if it has been damaged and bent.
SOURCE: industrial sewing machine top thread breaking
The brother DB 2 series of machines do not use a needle with a flat side. the needle system is DBX1 and are available from size 10 to size 20.
Try using the right needle for the machine and the right size for the thread you are using. this should make it better
SOURCE: Thread breaking.
Rethread the machine following these directions:
all machines thread the same. TTN tension, take up,
needle.
Beginning with the spool, guide the
thread through the thread guides to the tension assembly. Pull the thread
through the tension assembly and test it to make sure the tension is working
correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or
something in the middle. Raise the presser foot and pull the thread through the
tension. It should pull easily!! Lower the presser foot and pull the thread. It
should pull noticeably harder.) If it passes this test, continue up through the
take up lever,then down through the thread guides to the needle. Make sure your
needle is fully inserted and turned the correct way.( If you load your bobbin
case from the left side,the needle rule is normally FLAT to the RIGHT is RIGHT.
There are some exceptions. If you have a newer style drop in bobbin or your
bobbin case loads in the front then the rule is FLAT to the BACK.
Remove the bobbin case and bobbin. Pull on the bobbin thread to make sure it doesn't pull too hard. It should have some tension on it but not a lot. Insert the bobbin and bobbin case into the hook assembly and pull on the bobbin thread again.The tension should still be about the same. If it is tight, you need to look at the bottom of the pin that the bobbin case sits on and see if there are any threads looped around it. If there are , you need to remove them.
Hold the top thread , turn the hand wheel and see if the thread is catching someplace around the hook assembly. If it pulls the thread up easily, put some fabric in it and see how it works.
Make sure the thread is through the take up lever.
sewman7
Sewman7
SOURCE: Necchi Heavy Duty Sewing machine model 3205FA,
Generally when the needle does not pick up the bobbin thread, it means the needle is either too far in or just plain the wrong length. YOu might want to try lowering the needle just a hair and see if that helps.
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