The offset crown roller acts as the ?nal ribbon guide
immediately prior to the printing traverse of the ribbon
before the print head. The crest or largest diameter of
the crown is offset from the midline between the two
end ?anges of the roller. The roller is positioned so that
impact upon an unworn ribbon begins at one edge of the
ribbon; and as wear occurs due to repeated impact, the '
ribbon is constantly recentered and advanced toward
one flange. The ?ange toward which the ribbon ad
vances is spaced from the center or crest of the crown
by a distance suf?cient that the ribbon will not reach the
?ange and hence not impart any pressure to cause roll
over.