The main foot shaft or column is stuck in up position, doesn't go all the way down, doesn' t move when I press the peddle to sew. Can someone help me to figure this out?

Katherine, December 2011

if you can move it by hand their is a screw loose on cam arm,if not it means it is stuck because of little oil or a bent shaft.does the rest of machine turn and did you check drive belt. their are a couple of screws between main shaft and needle bar i presume that is the shaft not going up and down?please give more detail

johan, December 2011