You may have overfilled the Bobbin.....A little force will be required to remove it......I recommend using metal Bobbins......Do not fill the Bobbin outside of the Bobbin Rim...........
SOURCE: how do i refill a bobbin 7 thread machine
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To wind a bobbin, guide the thread from the spool post to the small round tensioner /guide on the top of the machine.Wind a few turns of thread onton the bobbin.Place the bobbin on the bobbin winder post. Release the hand wheel and wind the bobbin as full as you like or until it stops. Remove the bobbin,place it in the bobbin case and insert the bobbincase into the hook.
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.
sewman7
SOURCE: I have an older Husqvarna sewing machine (sle 6570
In the middle of the bobbin winding spindle, there is a piece we'll call a "flange". It is spring loaded but sometimes sticks. When it is in the center of the spindle it diengages the sewing machine drive system that drives the needle. Make sure it is not in the center of the flange. You can use a small screwdriver and gently press the flange outward and hopefully you may hear a small click and everything will be fine. Make sure also that the round plastic piece the flange is located in the center of, is pushed all the way to the left, (in you're sitting in front of the machine) if you pull that round platstic "knob" to the right, like you're trying to remove it from the flange, it will pop outward and engage the tranmission for sewing heavy fabrics.
SOURCE: Brother CS-8150 Problems with bobbin thread
Double check to see if the bobbin is in upside down and the thread is feeding from the bobbin spool in the wrong direction.
I did this once after several years using the same machine, some days are just not as easy as they should be!
SOURCE: bobbin thread won't engage.
The bobbin case is not in the shuttle.
Raise the needle to it's highest position.
Lift the lever on the back of the bobbin case and hold it open as you insert the case into the shuttle; arm on the case pointing up. You may have to turn a bit to the left or right - it will click when in place.
SOURCE: bottom thread too loose; tried
Check for correct bottom thread tension.
It's provided by a flat spring on the bobbin holder.
When the bobbin is correctly installed, pulling on the thread
should meet with slight resistance, and the bobbin should spin without
trying to jump out of the bobbin holder.
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