A 24-year-old Wisconsin man is being held for violating his parole while an armed bank robbery is investigated.  Quincy M. Dixon was taken into custody Monday.  Employees at the B-M-O Harris Bank in Fitchburg told police a man entered the facility at about 11:00 a-m.  They say he passed a note to a teller demanding money.  Though he didn’t show a gun, the people in the bank believed he had one.  Witnesses say when he left, he ran west from the bank’s entrance on Fish Hatchery Road.  Dixon matched the description of the robber which was given to police.