I am not sure what the problem is but the threads will not loop to form the ovrlocking stitch. I think the problem started after letting down the knife, only that it was not correctly in it's position. It may have move a part out of place, but this is only a guess.
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By the question, it looks like the lower looper is making loops? If so, check that you are using the correct needles for your serger and that the needle or needles is/are inserted correctly:
- needles must be all the way up into the needle shaft
- needles must face with the flat side to the back and the groove to the front
- use at least needle size 12/80, not smaller
Check these few items, if the loops are still not forming:
- re-thread the serger from the start, keeping in mind to thread in the proper sequence (upper looper, lower looper, needles)
- make sure that the lower looper thread lays on top of the upper looper thread and is passed to the back of the serger and then under the presser foot when threading
- make sure that the thread are securely engaged IN the tension assembly
- make sure that the serger is set for 3-thread or 4-thread overlock (i.e. that the upper looper converter is not engaged)
- check all tension setting
- stitch length should be around 2.5 - 3.5
If the thread is bunching up, it sounds to me like the stitch isn't being formed properly. Nothing to do with the bobbin, more a case of timing.
The spike, or whatever it is on your machine, which is under the needle, must pass through the loop in the thread from the needle at exactly the right time.
When the needle reaches it's lowest point, as it starts to go upwards again,a loop is formed in the thread,next to the needle eye. This loop is what the spike must pass through in order to make the stitch.
I think you are saying that there is a loop showing on the bottom of the lower thread stitch. If the lower stitch looks correct and not bunching, you will need to change the tension on the upper stitch. Make sure that your threads are firmly inserted within the discs also before adjusting the tension. It doesn't take much to change the tension so take it slowly.
It loops, it's just that your shuttle isn't catching the loop. The loop is formed on the upstroke of the needle on the back or "scarfed" side of the needle. If the shuttle point doesn't catch that loop, no stitch.
First make sure you have a fresh needle. If still no stitch... take it in for service. (clean, lube and time)
If the loops are forming on the bottom it is the TOP thread tension you need to check. Make sure it isn't too loose. Also is the needle the right type and size for the fabric? Check the stitch out on plain cotton fabric if a tension adjustment doesn't fix it.
The TOP thread effects the UNDERSIDE of the stitch and the BOBBIN thread effects the TOPSIDE of the stitch :)
Check the tension on your bobbin thread. When you hold it by the thread and let it dangle does it just drop down without any resistance at all? If so then you need to tighten it a bit. If the bobbin thread is too loose it can not pull the top thread down enough thus puts the loops on the top side of the stitch.
Raise the presser foot before threading the machine.
What looks like a problem with the bobbin thread is usually due to the machine being threaded with the foot down.
Foot up - tension control opens; foot down - tension control closes.
When the tension control is closed, the thread cannot enter as it should and then cannot be controlled to form a proper stitch with the bobbin thread.
The Singer Sewing Co website has many graphics that are the same for all sewing machines - you can check there with regards to winding, inserting the bobbin into the case/shuttle and bringing up the bobbin thread.
I believe stitch 11 is a zig zag so you are probably decreasing the length to get a satin stitch. You will get a better satin stitch if you select it directly. I think that it is about 29. The machine forms the satin stitch differently than the zig zag and it should look better. If you still get loops on top, you may need to have a qualified technician check the needle to hook clearance. If this distance is too great, the machine skips stitches and you will form loops. Several other adjustments may be needed to get a perfect stitch and a qualified Husqvarna technician should be able to take care of this problem for you.
Make sure you have threaded the machine from right to left, it sounds like the needle thread is trapped under the lower looper thread and cannot form a stitch.........start the threading over from scratch like this:
Is there a diagram for how to thread on the inside of the door ?
Follow that slowly and carefully to make sure you have not missed any thread guides on the way, as each one needs to be followed through to ensure correct tension and thread progression.
If you are certain that all threaded correctly, did you have a fabric jam and pulled it loose ? If so, the timing may well be affected.