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Re: shuttle hook has come loose
Bring it in for service, if you do the repair and do it wrong (and you will) then it could cost you hundreds of dollars to replace the shuttle. Pay a little now, or tinker with it and pay a lot later...
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First, be sure you are using a brand new needle. A bent/dull/damaged needle may be hitting the internal mechanism of the machine.
If the needle is still hitting, it is most likely a timing issue. There are lost of web sites and videos on the internet that address sewing machine needle/hook timing if you want to try to fix it yourself. Or take it for service.
You might have a piece of the needle lodged in the shuttle where the bobbin goes in or some thread under the shuttle. If so clear out very gently to unjam the shuttle so it will be free again to spin the bobbin. Use the hand wheel not the presser foot.
The Activa range is fitted with a light-weight part-plastic hook/shuttle that Bernina claims does not require oiling. However, this does not mean it shouldn't be regularly cleaned and I'd recommend that it is also lightly oiled at the same time. Remove the bobbin case, press the metal lever to the top left of the bobbin door and the black plastic hook/shuttle retainer should pop open so that the hook/shuttle can be removed, or it will just drop out anyway. Use a cotton bud to firmly clean around the inside edge of the hook race (the round piece that the hook/shuttle sits in. Give the whole thing a good clean to make sure any surface grime/fluff is removed. Put a small drop of oil on the running surface of the hook race - the recessed groove around the inside edge, before replacing the hook/shuttle and holding in place by pressing the hook/shuttle retainer back until the securing lever clicks back into place. Rotate the handwheel once to distribute the oil and off you go. Dont overoil but do this regularly and your machine will run much quieter and produce a consistent stitch formation.
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.
the hook driver (still in machine) is 1/2 moon shape. The hook is also 1/2 moon shape. If you set the machine on its back, it's easier. Set the hook 1/2 into the other 1/2 of the hook driver to make a circle. Then put the hook cover on (machine still on its back) with the tabs for the twist locks pointed out. Needle gaurd to the top of the machine. Snap the twist locks in place and viola!
The shuttle hook will be covered by a plate called the RACE. Its a flat steel plate that sits over the hook and is snapped in place by 2 black coloured snaps.
Looks like you are trying to operate the machine without the race on. try that and it should work.