IBM Selectric - Page 69

2.
Figure 197-0 isosomple of how the lift pattern will look
when the lift guide plate is adjusted parallel ta the slot
in the cam follower.
In Figure 197-b the lift guide plate is adjusted too high
at the rear 'llith respect to the slot in the cam follower.
This condition causes the lift guide ass~mbly to drop down
a
slight amount whenever the control link is moved to-
ward the rear into a low lift position. This causes both
of the low lift positions (those nearest the top of the rib-
bon) to be affected because some of the Ii ft moti on pro-
duced by the ribbon lift cam must be wasted in order to
overcome this slight amaunt of drop that occurs to the
lift guide assembly each time the control link is moved
toward the rear. Notice that the overall result of this
maladjustment is a spreading effect to the lift ~attern be-
tween the high and low lift positions (Fig. 197-b).
In Figure 197-c the lift guide plate is adjusted too high
at the rear with respect to the slot in the cam follower.
This condition causes just the opposite of that of Figure
197-b. Whenever the control link is moved forward into
either one of the high lift positions, the lift guide as-
The adjustment of the control link positions the prev-
iously adjusted lift pattern on the ribbon. It does not
have any effect on the distance or spread between each
one of the four lift positions in the pattern.
NOTE: Make certai n that the lift control lever does
not stri ke the verti ca I lug on the left hand corner of the
feed plate when the lever is in its highest lift position.
RIBBON LOAD
1. Load Lever link - The load lever link should be adjusted
toraise the ribbon lift guide assembly as high as possible
without binding off on either the feed plate or the take-
upspool when the load bail is in the load position (Fig.
198) .
lift Guide Assembly
Feed Plate
sembly drops down slightly and the high lift positions :;
(those nearest the bottom of the ribbon) are affected. (
The overa II resu It is a crowd i ng effect to the lift pattern ' '
between the high and low lift positions (Fig. 197-c).
A good check for the crowding effect illustrated by
Figure 197-c is to alternately type the degree and un-
derscore instead of H's. These two characters are used be-
cause they are usually the highest and lowest printing
characters on the typing element. If the degree is typed
in phase with a low ribbon lift operation, when beginning
to alternately type the degree and underscore, the lift
pattern embossed onto the ribbon wi II look simi lor to
Figure 197 -d. If there is no character overlap on the
ribbon between the degree and underscore, then the
crowding condition illustrated by Figure 197-c does not
exist. (Some styles of typeheads may have characters
that print higher or lower than the degree and under-
score. If so, use them for thi scheck.)
A good check for the spreading effect illustrated by
Figure 197-bistoalternatelytype the degree and under-
score beginning with the underscore in phase with a high
ribbon life operation. The lift pattern illustrated by Fig-
ure 196-e shou Id occur. If the lowest underscore stri kes
the ribbon approximately .050" from the bottom edge of
the ribbon and the highest degree strikes the ribbon ap-
proximately .030" from the top edge, then the spreading
condition illustrated by Figure 197-b does not exist.
(The control link adjustment which controls the position
of the entire lift pattern on the ribbon must be considered
when using this check.)
NOTE: It will be necessary to recheck the supply spool
brake adjustment if the lift guide plate position is changed
because the brake actuating lever receives its motion from
an upright extension of the guide plate.
lift Control link - Adjust the clevis on the control link
so that the lowest underscore prints approximately .050"
from the bottom of the ribbon (Fig. 197-e).
68
2.
Load Lever link
FIGURE 198. Load Lever Link
NOTE: Make sure that the load bai I does not contact
the flanges of the take-up spool when the bai I is in its
closed position as this could affect the take-up tension.
Pressure Roller Release Arm - When the road bai I is
pulled forward into its load position the supply drag lever
shou Id be pushed forward, by the pressure roller, suffi-
cienty to just clear or be tangent to the front edge of
the supply spool. Adjust the pressure roller release arm
(located on the left end of the load lever) by its lock
screw to obtain this condition (Fig. 199). Do not form
the supply drag lever to obtain this adjustment. --
CAUTION: When the loadbail is in its closed position
a clearance must exist between the pressure roller release
arm and the pressure roller lever. This clearance insures
that the pressure roller wi II be fully engaged with the
feed roller whenever the load bail is in its closed po-
sition.