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Figure 4-47. Character Patterns E'A'
6. Check under power by duplicating punches shown in
their normal return after printing. If necessary, remove
Figure 448. Correct setting, of the code plate stops
code plate shims and readjust printing pressure to
prints the characters shown.
maintain enough clearance to prevent wire return collars
7. Stops must be checked and readjusted each time the
from striking wire-guide rear (Figure 443).
Code-
blank position of the code plate is altered.
plate-to-wire clearance should now be 0.028 inch to
0.030 inch.
4.1 1.2.5 Printing Pressure
1. Turn in evenly on the three adjusting nuts (Figure 4-43),
114 turn at a time, until printing is obtained. Tighten
lock nuts after each step and space before punching to
prevent damage to wires.
A
practical test to show uneven
printing can be obtained by disengaging the ribbon feed
pawl and printing an H until the printing grows faint.
Too much printing pressure will make the machine
noisy and cause marks to appear when spacing.
2. Print arm roller (Figure 4-49) must be free to lift 0.010
inch off the cam during print suppression to reduce
noise and wear on the cam. Check clearance with print
drive spring removed. The lifting motion drives wire
collars 0.005 inch closer to the wire guide plate than
4.1 1.3 Print Assembly Removal and Replacement
4.11.3.1 Print Head
1. Remove the ribbon spools. Slip them together and tape
them to the bed plate. Leave the ribbon under the die.
2.
Unscrew the gear at the upper end of the flexible shaft
(left-hand thread) if installed.
3. Pull the print drive rod (Figure 4-50) out of the print
arm.
(On some units, it may be easier to remove the
right horseshoe clip and slide the drive rod over, instead
of disconnecting the drive rod from the stud.) Remove
the four krews holding the print head to the stripper;
lift the print head off the guide pins and completely off
the base.
29 FEMM
(4169)
4-33
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