The machine was given to me a couple of years ago. I paid a hundred pounds to get it fixed but still not comfortable with using it, Until a couple of days ago i had a really good run and very excited.
But now the Bobbin thread keeps on knotting up and forcing the machine to stop.
I have tried cleaning and oiling the bobbin, to no avail.
I hope you can help me in this matter, Best Regards
Take out the bobbin race thing (behind the bobbin case) clean the area up. Oil the race, just a drop. Check the bobbin case for thread under the tiny spring (use tweezers if you see any). Make sure it's a good bobbin and that it unwinds clockwise. Up top, check your thread path and make sure you thread while presser foot is UP. Spool should also reel off clockwise. It's gotta be something like that. I have several of these machines (old Berninas, that is!) and there's almost never a problem.
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here's my suggestions change the needle-make sure the needle is inserted correctly into the needle holder & also turned the right way make sure when sewing on the machine that the top thread does not come off the thread take up lever check the top thread tension it may be too tight,, usually 4 is good or if the machine has automatic tension set it there make sure it's the right needle for the machine & make sure it's the right needle for the fabric & thread. some thread is knotty ,,, make sure the thread is good quality
If your machine has not been used for a few years, chances are the oils in the machine have drained from where they should be. It might be a good idea to get it serviced whether or not you solve the bobbin winding problem. One thing I would try is to run the machine with no thread for a bit - not flat out, but just to get the oil that is in it warmed and lubricating the moving parts. Stop if you hear strange noises that don't sound right. I have a 7550 which is basically the same as the 7570, but can't think of anything that might cause your winder to behave in this manner. It is after all a pretty simple procedure. It might be that the winder was on its way out anyway before you stopped using it a few years back, and the lay-off was the last straw. It probably would not be a really expensive repair and well worth it - these machines are fabulous!
Try flipping the bobbin spool so the thread comes off in the other direction.
Forcing means that the needle has been jammed against the sewing plate ant the needle is now out of timing with the bobbin pickup.
I answered this a couple days ago but don't know if it went through. I can sew through 6 or more layers of denim with my 226, no problems at all. In my 30 years in the upholstery business I never had a problem sewing leather, vinyl, canvas or multi-layers of fabric. The 226 Consew, the 111W and 211w Singers I had presented zero problems with heavy fabrics - and I don't consider vinyl "heavy".
You need to first of all check threading. If the machine's threaded wrong you're break thread. Also you need to oil under the bobbin case and the bobbin hook and the rest of the parts as well.
Then, loosen thread tension on top by turning the knurled knob that's on the spring that's holding the tension discs. Also loosen bottom tension on the bobbin case by turning the small, left-most screw on the outside of the bobbin case counter-clockwise. Do both with the presser foot down. Pull the thread(s) out and feel the tension. You should be able to pull the threads out with some little effort. Tighten both a little at a time until you get some tension. Run a couple seams and check where the threads meet in the fabric. They should meet in the center. Also check stitch length. If you're using 92 thread (is should be left twist), you should run the machine at about 6 - 7 stitches/inch. I'm running my machine at 5 - 5 1/2 with #69 nylon bonded, and 6 - 6 1/2 with #11 mono.
One more thing; if tension's too loose at the bobbin or top, the machine will jam in the bobbin and thread will break.
Go to www.consew.com and download a pdf owner's manual for free. You need to click on the 224. That machine, the 225 and 226 are the same.