Goldsworthy's pfaff long arm.
The needle hits the bobbin casing. Is the timing off? Tried different needle, without needle the cycle works. Can I fix it myself?
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First, make sure there is no debris and scraps of thread in the bobbin area. I'm sure you did that already. I assume you also tried it with another thread just to be sure. I would suspect that the timing went out of whack. The machines depend on a synchronization between the needle motion and the bobbin action underneath. I once had a Singer that slipped and I had to reset the timing. If it is the timing synch problem then it would happen consistently and not work sometimes and then not work other times. G
Take off the presser foot take off the needle plate take off the bobbin plate take out the needle, clip bobbin free, Examine the bobbin carrier on how it fits into place. (important) Lift out the bobbin carrier.
Each machine is a little different. You may want to take pictures as you do each step for later reference. Use something like an old egg carton or a muffin tin to keep your parts from rolling around or getting knocked off an lost.
Could be a bent needle? please change it for a sharp new one and make sure it goes in correctly, flat shank to the back.
Bobbin case dislodged or not in correctly ; I think these are vertical rotary hook machines with the bobbin inside a removeable bobbin case? Check that you have put the case in correctly, there is usually a long finger on the case that latches into a point on the rotary hook, holding the case in the correct position. Probably also a latch on the front of the bobbin case, which you use to fit it into place and remove it.
Lastly could be that the machine timing is out. Manually turn through a stitch sequence with no thread or bobbin, the needle needs to be at its lowest point down into the bobbin area when the rotary hook brings the thread around to catch at the back of the needle.
If you suspect it is the timing, you may want to get a technician to do this repair but certainly try the first two items first.
Check you have the right size bobbin case the gap where the needle enters should be 13mm approx at the widest point. A lot of other pfaff bobbin cases seem to fit and can be easily be mistaken. I have two pfaffs and have accidentally mixed the cases and had a similar problem.
A question to help determine what's happening with your machine(s).
Open the bobbin case so you can see the bobbin area. Begin by trying to turn the handwheel towards you and watch as the needle attempts to go up/down. If you cannot turn the handwheel towards you, turn it slightly backwards then forwards. Does the needle hit the bobbin case as it comes down?
If yes, your machine is out of time and will require a professional technician to repair.
If the above is not the case, there may be thread jammed behind the bobbin case or wrapped around the inner parts of the take-up lever.
Either case - a Pfaff authorized technician would be your best bet for a proper repair.
Best of luck with your machines - it's just awful to not have the at the ready for all our projects!
Your hook/needle timing is off and it needs to be seen by a technician before you damage the hook. Some dealers can do a 24 hour repair for an additional charge. sewman7
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