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Ribbon Drive
The printer uses a continuous ribbon that can be
replaced by the operator.' Two ribbon feed rolls
G
pull
the ribbon through a slot from one end of the ribbon
box, around the print head, past the print wires, and
feed it into the other end of the box. A half twist. is
placed in the ribbon during manufacturing so that, as
the ribbon passes the print wires, the top half of the
4-36
ribbon prints on one pass and the bottom half prints on
the next pass.
The print head, ribbon box, and ribbon drive mechanism
are mounted on the carrier and move left to right under
control of the carrier motor. The ribbon feed rolls are
driven by 2 lines
II
through a series of idler gears. The
lines are looped around a double clutch-
D
located
underneath the carrier, that drives the ribbon feed rolls.
The clutches drive in 1 direction and free-wheel in the
other. The lines are looped so they both drive the
ribbon in the same direction, providing a clockwise
ribbon path whether the carrier is moving left or right.
Ribbon roll before
~"Om'·4----';'--drive
action arranges
it in the ribbon box.
~~;)....-I ===:$~_~~~;=~::;l
B/
,/
/'
/'
Underside View of Printer in the Service Position
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