Tube printer for printing information on the inside of a tube and method of printing

A method of printing information on an interior surface of a tube comprising the steps of:

• providing a tube printer having a housing including at least two side members and a top plate, said at least two side members depending from the top plate, the housing including spring biased guide wheels that cooperatively center the housing within the tube and an operating handle operatively attached to an end of the housing to provide a means to push and pull the tube printer within the tube, an ink wheel assembly operatively positioned between the side members of the housing, and a print wheel operatively positioned between the side members of the housing and adjacent the ink wheel assembly and including a raised surface containing the information to be printed on the interior surface of the tube;
• inserting the tube printer into an open end of the tube whereby the spring biased guide wheels force the print wheel onto an interior surface of the tube;
• moving the tube printer over the interior surface of the tube thereby printing information on the interior surface of the tube.