Question about PfaFF Hobby 4260
Sewing a straight seam will be going well until the bottom thread suddenly becomes very loose and loopy. The top thread is completely fine. The only clue that this is happening is the spool "jumping" instead of unwinding silently and consistently. I suspect a bobbin problem...I rewound the bobbin, but it happened again resulting in more seams needing to be ripped out. Any ideas about what is happening with my bobbin?
A few steps to help you troubleshoot:
Remove the needleplate from your machine and inspect the opening for any rough spots... run your finger over the area to feel for any sharp bits. If you discover some rough spots, they can be smoothed using a fine emery cloth. Use this gently - don't want to distort needle opening, just smooth the roughness.
If no rough spots on needleplate, open the bobbin cover and turn the handwheel towards you until the hook (little pointy part of bobbin area) is towards the bottom of the machine. Run your finger over the point to feel for any rough spots. Again - a fine emery cloth can smooth this. Be VERY careful to not flatten the hook - just a little smoothing to get rid of rough bits. Too much can ruin the hook. If you're uncomfortable with this, don't hesitate to take to your Pfaff tech and point out the rough bits.
You can loosen the large setscrew on the side of the case to allow you to blow out whatever may be trapped.
Use a flashlight and look down into the top of the machine/takeup lever area. You may be able to see a bit of thread and remove it. If you can't see an offending bit, try "Flossing" your upper thread path by grasping the thread close to the spool and after it comes out of the needle. Run the thread back and forth through the thread path to see if you can dislodge anything
Kim & Linnette
Posted on Jun 13, 2008
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Posted on Jan 02, 2017
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