Rockford police say the man entered Hucks in the 2000 block of Stowmarket around 1:30 Tuesday morning with a gun.
He then took off with an undisclosed amount of money.
The suspect is described as a white or Hispanic man, six foot and 170 pounds with a light colored beard. He was last seen wearing a hooded sweatshirt and black pants.
Police say he jumped into the passenger side of a dark car.
If you have any information, call your Rockford Area Crimestoppers.