Why does'n the needle catch the bobbin thread on Necchi BU Nova

If the pink part that catches the needle's thread (the shuttle hook) has stopped turning, it may be due to several reasons. Here are a few things you can try:

1. Check the bobbin case: Make sure that the bobbin case is correctly installed in the shuttle race and that it is not damaged or dirty. If the bobbin case is not correctly installed, it can prevent the shuttle hook from turning.
2. Check the needle: Ensure that the needle is properly installed and not damaged or bent. If the needle is damaged or bent, it may not be picking up the thread properly.
3. Clean the machine: If the machine is dirty or has lint buildup, it can affect the movement of the shuttle hook. Clean the machine and oil it according to the instructions in the manual.
4. Check the shuttle hook: If the shuttle hook is damaged, it may need to be replaced. Check for any signs of damage, such as chips or cracks.

If these steps do not resolve the issue, you may need to take the machine to a professional for repair.

Sounds like there could be a burr or nick somewhere that is catching the thread and shredding it. Change the needle. Wrap your index finger with some fine fabric (old hosiery, chiffon, silk) and run it around inside the machine around the bobbin/shuttle, feed dogs, needleplate, presser foot. If there is a burr, you will probably find it. If it is minor, it can be smoothed with a fine emery board or fine sand paper. If it is major, you may need to replace the part.

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Take a look at the manual and make sure you have the bobbin going in the right direction in the bobbin case. Each sewing machine is different. On my Kenmore the bobbin drops in counter clockwise, on my old Universal KAB you have to the bobbin with the tread facing away from you when you slide it in the bobbin case then pull it through the slot and put ut under the tension spring. It is the same for the Brother Lx3125 as the Universal.

Remember the needle bar needs to be in the highest point. Make sure the horn goes into the slot in the shuttle race and is properly seated in the race.

The bobbin needs to be about 5 inches long and your upper tread also needs to about 5 inches long from the needles eye. Hold your upper thread tightly so that when it enters the needle plate hole it can catch the bobbin thread. Pull both of the threads beneath the presuure foot and toward the rear of the machine.

The shuttle hook is suppose to hook the needle (spool) thread and loops it around the bobbin case to form the lock stitch. Is it possible that something was adjusted without proper clearances as to allow the thread looping around the bobbin case to do so without catching up where it should pass through freely?
~<Ray>~

Make sure the bobbin has a 3-5 inch thread tail
Then make sure the top thread has a 3-5 inch tail
Then hold the top thread tail with your fingers (away from the needle)
& use the hand wheel on the right hand side of the machine to slowly
Lower the needle in the bobbin area & see if the bobbin thread will pick
Up that way

If you broke a needle and cannot get it to pick up the thread from the bobbin you need to check your timing. Remove the needle plate and turn the machine over watching the needle, when it is at the bottom of its travel the hook on the shuttle should be right next to or a fraction from the needle. So that as the needle begins to move upward the hook should pass it if it passes to soon it will miss the loop of thread. Check to make sure your needle is installed all the way up in the bar. If your machine is out of time and you are fairly handy, you can retime it. There should be 2 set screws some where behind the shuttle. Loosen them, one loose and one only as loose as need be to turn the shuttle. The needle must have moved upward about 1/16 before the hook is in place to catch the loop. This can be time comsuming, and you will have trial and error. Good luck. P.S. always check for simple stuff before you go for the hard stuff.

try sewusa loads of manuals and sewing diagrams. Since its a older machine.I would clean and oil it also.Lint can cause all kinds of issues.

check that the needle is in the right way round i.e. with cut out on the needle facing into the machine. if this is fine then check that as the needle comes back up from the lowest point that it goes to, that the point on the bobbin case passes just above the hole in the needle, i.e. in the middle of the cut out.(if not it needs re timing) if threaded a small loop should appear at this point for the bottom bobbin to catch if not slacken the top thread and try again.

Sounds to me that your machine is out of time. I recommend you take it to your local repair center.

Actually,timing of needle vs, shuttle is not very easy job several factor you should check on.There is belt ot sometime a shafting with worm gear and helical gear under machine w/c drive the shuttle with the bobbins in timing order,Any one of them is present on the timing adjustment can be done by releasing the belt or the helical gear,besure machine is unplug then set all mechanism on low dead center meaning the needle move to utmost lower position catching this by the shuttle and bobbins at center position.No motion applied if this was set up,engage the belt with pulley and the bobbins link holder tigh allenscrew besure the needle is lower dead center at the center of shullle bobbins catching needle without motion when setting back at original position.If this was made manually move it on handwheel going up and side down the needle gradually if the needle move freely several time and it was catching this by the shuttle hook bobbins.if ok put thread bobbins and upper thread dial tension with the needle.Move machine on handwheel try to catch the bobbins thread,If this so your machine is ready to sew again if problem occurs on alignment repeat adjustment on perpect alignment,besure all parts on upper casing of machine specially two drive gear are in normal alignment.