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Printing Method
Printing
on
the 3215 is done by
seven
wires arranged
vertically in
the print
head
(Figure
3).
Decoded
signals
from
the system selectively allow
the print wires to
strike
the ribbon
and
paper. The pattern of
dots
formed
by
the
ends of
the
wires corresponds
to
a stored matrix in the
system processing
unite
The
print head moves
across each character to form
a
7 x
7
dot matrix
.
As required by
the character
pattern
,
each
wire
may
strike
up to
four times per character (for
example
,
wire No.5 in
Figure 3)
.
Three
alternate
positions
allow for curved and
diagonal
elements (wire No.3
in
Figure
3).
The
print
head moves across the print line
at a
rate up
to
8.5 inches (215 ,9
mm)
per second whether printing or
spacing.
An
indicator
on the front
of
the printer
designates
the next print pOSition
fo
r
the print head.
A maintenance
monitor
indicates to service
personnel
when maintenance should
be
scheduled
.
Figure
3.
Print
Mechanism
and Character
Construction
6
o
-
0
8
0
_
0
2
0
-8-8-
0
3
0
8
0
_
0
8
0
4
8-
0
-
0
-8
58-0-8-8
6
8-
0
-
0
-8
7
8-
0
-
0
-8
2 3 4 5 G 7
o
Standard
F
iring Positions
_
Alternate
F
iring
Position
s
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