My boss let me borrow his camera which shoots "high speed footage" and then plays back slow.
This link is to a 4-5mb video clip of my 1946 Singer 241-12 High speed Industrial bobbin assembly at work.
It starts out static, then we went about 1/2 speed, then full speed, then 1/2 speed again.
When it is not going fill tilt boogie, you can see the needle pop in an out at the top and if you have quick eyes you can see the thread making the loop.
Enjoy.
https://dl.dropbox.com/u/18576541/Singer%20241.mp4