Small Appliance Repair Questions? Ask a Technician ASAP
If the needle is not engaging the bobbin thread, then you might have the bobbin turned the wrong way around. Check that first and also try removing the top thread and rethreading the sewing machine. You may also need to change the needle if it is bent or blunt.
Another fix that usually works is to hold the thread in the needle to the left while you put the needle down to pick up the bobbin thread.
Does the mechanism seem seized?
These older machines need serviced regularly. Has the machine been serviced recently?