Singer 7422 my auto bobbin threader will not engage when I try to thread a bobbin. It doesn't seem to be disengaging the needle.

Did you get it fixed? Here is a video that may help.

hi there.
go to this link should help you to find out why.
Singer Sewing Machine thread just bunches up on the bottom of the material...

try a new needle--make sure it's the right needle for the fabric
being sewed.
try rethreading the machine top and bobbin --make sure to use
every thread guide
try a different bobbin
it's also possible that the machine could have a timing problem
and needs to be checked

here's a free manual if you need one just click on the link

http://www.singerco.com/uploads/download/f3eff19dd0b1966512ad6a6bd24e3d8a74926fca.pdf

have you tried changing the needle?
is the needle in backwards?
is the needle inserted all the way into the needle holder?
clean under needle plate & in the bobbin area for lint or loose thread
did you hit something with the needle?

Check on the threader and see if the part that goes through the eye of the needle is bent. This is a very common problem. The threaders are becoming more and more difficult to replace. If the piece is bent, you can usually use a pair of tweezers to straighten it out.

"Birdnesting" occurs when there is no tension on the needle thread to pull the bobbin thread. This is easily corrected by rethreading the machine, following the threading path carefully and making sure the thread is fully engaged in the tension mechanism.

Your problem lies with the main shaft that is to tight to release the bobbin winder mechanism, because of old grease and oil becoming sticky. A short term solution will be to remove the needle, in order not to hurt you, and then hold on to the needle bar with your left hand, while engaging the bobbin lever with your left hand. This will prevent the main shaft to rotate and your winder should work. In the long term, take it to your dealer to clean the oil and grease. You will not be able to open the machine casing yourselve, as you might damage the casing and or electronics.

Good luck!

Your machine could be defective. Take it back where it was purchased.

My Singer 7422 seems to be jammed. When I start to make a stitch, the thread from the needle gets caught on something on the bottom and the thread goes over the bobbin.

You need to remove the needle plate and take out the bobbin case. Examine it for any rough spots, scratches or burrs. When you find them, you will need to remove them with an emery stick and then buff it with very fine steel wool. Reinstall the bobbin case and the needle plate. Put the bobbin in the machine so that it turns counter clockwise when you pull the thread. Rethread the top of the machine and change the needle. Hold the needle thread , turn the handwheel and see if the bobbin thread is picked up without snagging anyplace. If it's okay, sew away.
sewman7