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Ribbon Drive
The ribbon cartridge and ribbon drive mechanism are
mounted on the print head carrier and move with the
carrier. Two ribbon feed rolls in the cartridge move the
ribbon past the print wires and back into the cartridge.
The ribbon feed rolls are moved by two stationary
ribbon drive lines. The ends of these lines are attached
to both sides of the printer frame and loop around two
clutches located underneath the print head carrier. The
clutches drive in one direction and slip in the other.
The lines are looped so that both clutches drive in the
same direction and supply clockwise ribbon movement,
regardless of which direction the carrier is moving.
To right-hand bracket
To left-hand bracket L..r----~
"0
~
Clutches
Ribbon drive lines
4-2
SY34-0613
Print Iteod
The print head has eight vertically arranged print wires.
The wires are numbered 1 through 8, from top to
bottom. Characters are formed by patterns of dots that
are made when the print wires strike the ribbon.
At 160 cps, the character dot matrix is 7 -high by
7-wide. At 40 cps, the character dot matrix is 14-high
by 13-wide. Print wire 8 can be used for characters
with curved or diagonal lower elements, or for under-
score.
Print wires
are numbered
1 through 8
wire guide
, Solid dots denote
portions of
characters printed
by the print wires
as the print head
moves from
left-to-right
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