My machine was working fine until recently (when I had to have the foot fixed).
I tried it. It started to sew, then the bottom thread knotted up.
I changed the needle, cleaned out the bobbin casing, cleaned any dust.
It now does not pick up the lower bobbin thread, so I cannot sew.
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Are you able to remove the bobbin case from the machine? Remove the needle and then work at gently removing any knots of thread in the bobbin area until you are able to remove the bobbin case.
Once the machine is cleaned of all the excess thread, lint, etc., install a BRAND NEW NEEDLE, reinstall the bobbin, and rethread the top thread. Then retest your machine on regular woven fabric. If it stitches, then you are probably okay. If it will not pick up the bobbin thread, then the machine is probably knocked out of time.
Search for: sewing machine timing
or take it for service.
FWIW, vinyl presents issues when sewing. A roller or teflon foot may help. Also, placing tissue paper between the presser foot and vinyl could be beneficial. Look at using a top-stitch needle to prevent the thread from hanging up on the vinyl. Search for web sites or videos on how to sew vinyl.
Hmmm, could be several things.
Try a brand new needle. Try a different brand of thread.
Remove the top thread from the machine. RAISE the presser foot and rethread from the beginning. Verify the thread path is correct.
If it still will not pick up the bobbin thread, the machine could be out of time.
Always turn the handwheel TOWARDS you (counter clockwise) as turning it in the opposite direction (away from you, clockwise) may knock the timing out requiring repair from a service center.
Always be sure your presser foot is in the DOWN position before sewing. Sewing with the presser foot in the up position will cause your thread to tangle and your bobbin to jam.
Change needles regularly (after 16 hours of use) as dull/weak needles can cause damage to your machine and fabric. Only use SINGER needles on your SINGER sewing machine.
Always be sure you are using the correct bobbin for your machine. Class 66, Class 15 and Class 15J bobbins look very similar. However, using the incorrect bobbin class in your machine can cause damage.
Not sure what brand of machine you have but generally after threading the bobbin the thread should be pulled out through a spring like device and by pulling on this thread and holding the bobbin case loosely in your hand, the bobbin case should turn clockwise inside the case. Clockwise is essential.
Then turn the machine by slowly by hand and let the needle go down and up once. Then pull up the end of the needle thread which should then lift the bobbin thread with it. Pull both through the back of the presser foot and start to sew. I hope.
This is sometimes caused by the upper thread not threaded correctly. You need to thread it first with the pressure foot in the up position. You need to "floss" the thread into the clear plastic guide as this is where the tension is. The tension should be set to E for embroidering. Also make sure you get the bobbin thread in the slot on the bobbin case. Also, lower your pressure foot before you begin embroidering. Hope this helps!
TRY THIS, itma not be your model, but should help
Title: How do I wind the bobbin?
Pre-tension disk Bobbin winder shaft Bobbin
Pull up the spool pin as far as possible, and then put a spool of thread on this pin.
Pass the thread around the pre-tension disk.
Make sure that the thread passes under the pre- tension disk.
Pre-tension disk Pulling it in as far as possible
If the spool of thread is not in the right place, the thread may tangle on the spool pin.
Pass the end of the thread through the hole on the bobbin from the inside of the bobbin.
Put the bobbin onto the bobbin winder shaft and slide the bobbin winder shaft to the right.
Turn the bobbin clockwise, by hand, until the spring on the shaft slides into the groove of the bobbin.
Spring on the shaft Groove of the bobbin
Turn on the sewing machine.
While holding the end of the thread, gently press the foot controller or press start/ stop button (for models equipped with the start/stop button) to wind the thread around the bobbin a few times. Then stop the machine.
If the sewing machine is to be operated using the foot controller, connect the foot controller before turning on the machine.
When the foot controller is plugged in, the start/stop button cannot be used to start sewing (only for models equipped with the start/stop button).
Trim the excess thread above the bobbin.
Make sure you follow the instructions carefully. If you do not cut the thread completely, and the bobbin is wound, when the thread runs low it may tangle around the bobbin and cause the needle to break.
Slide the sewing speed controller to the right (to set the speed to fast). (For models equipped with the sewing speed controller.)
Sewing speed controller
Press the foot controller or press start/stop button (for models equipped with the start/stop button) to start.
When the bobbin seems full and begins spinning slowly, take your foot off the foot controller or press start/stop button (for models equipped with the start/stop button).
Cut the thread, slide the bobbin winder shaft to the left and remove the bobbin.
Slide the sewing speed controller back to its original position (for models equipped with the sewing speed controller).
Not winding the bobbin properly may cause the thread tension to loosen, and may break the needle.
Wound evenly Wound poorly
When the sewing machine is started or the handwheel is turned after winding the thread around the bobbin, the machine will make a clicking sound; this is not a malfunction.
The needle bar does not move when you slide the bobbin winding shaft to the right.
Hi i have a Janome 350E thread got court undert the needle plate so i cut the thread from under the hoop and got it all out the bobbin shuttle but the machine wont sew now it seams to be out of timining as the needle is coming up to soon for the shuttle to pick up the thread can you please tell me how i can fix it as i dont have a sewing machine mechanic in town and i will have to travel up to 2 hours to get it looked at and they are really slow to get things back to thier clients.