Singer touch & sew 640 bobbin won't turn

No idea what's causing this, although something here may help:

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Bobbin won wind beeps flashing lights

Singer 7462 bobbin problem

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Take it to a local sewing machine repair and sales business for repair.

here are 2 links for a manual, that should have the information
inside, one is a downloadable pdf copy the other is a hardcopy

http://www.sewingpartsonline.com/instruction-manual-singer-touch-and-sew-630-and-640-download.aspx

http://www.sewingpartsonline.com/instruction-manual-singer-630-touch-and-sew.aspx

Sounds like the motor might be having problems. I would take it in for a proper servicing.

Check for thread caught under silver guide, may have got jammed in there.

try changing the needle--flat side goes to the back of machine
rethread the machine top & bobbin--make sure to use every thread guide
make sure bobbin is wound correctly & inserted correctly in the bobbin case
clean under the needle plate & in the bobbin area for lint or loose threads
if you don't have a manual try singer
Go to the singer website
Click on customer support--there will be a drop down menu
Choose instruction manual
In the box type the model number(example 758)
Click search

try changing the needle-flat side goes to the back of the machine
clean under the needle plate & in the bobbin area for loose threads or lint

Try a new needle first failing that you may need to retime the machine, you can email me for an attachment of instructions [email protected]

I have the same problem! Did you ever figure it out?

To wind the bobbin, select straight stitch, thread the machine up as normal making sure the presser foot is up, open the slide plate, push the little button over to raise the winder, take the thread and wind it round the presser foot screw a few times, press on the foot control slowly and the bobbin will wind, when you have enough, stop, close the slide plate to drop the winder down, pull the threads to the back and start sewing. for manuals try www.tandtrepair.com