A system for maintaining alignment between a print head (18) and a
transfer surface (34) of a drum assembly (38) includes a first contacting
member (78, 80) carried by the print head. A first receiving member (82,
84) is carried by the drum assembly. A drive mechanism (20) translates
the print head relative to the transfer surface. During translation of
the print head relative to the transfer surface, the first contacting
member maintains a sliding contact with the first receiving member.