WRAPAROUND RIBBON PRINTHEAD ASSEMBLY FOR A PRINTING MECHANISM

摘要

Printhead assembly for a printing mechanism of the kind that swipes a printhead (109) along a ribbon (116) in producing marks on a receiving medium (106) mounted to pivot and includes a ribbon guide (36) that serves to wrap the ribbon around the trailing side of the printhead (10). The assembly is positioned to permit the printhead (10) to be rotated to a normal printing position at a printing line. By so arranging the ribbon path that the ribbon directions for arrival and departure of the assembly intersect the pivot axis, essentially zero resultant torque may be applied to the assembly by ribbon tension forces and the printing pressure at the receiving medium is, accordingly, unaffected by ribbon tension variations.