Ribbon Shift Mechanism - IBM Selectric Maintenance Manual

point, adjust the ribbon feed plate forward or back so
that the ribbon feed pawl holds the reverse interposer
within .001" to .015" of its total travel (Fig. 194).
The adjustment not only insures sufficient throw for a re-
versing operationj but also gives optimum ribbon feed
results by determining the rest and active positions for
the pawl.
CAUTION: After completing the adjustment, manually
cycle a character to check that two teeth feed is ob-
tained plus .005" to .020" overthrow.
Be sure that the feed pawl does not contact the inter-
poser lever as the pawl is manually reversed from side to
~ide
•
o
.OIO"~
FIGURE 196. Stencil Locking
4. Cartridge Guides - Form the ribbon feed plate lug that
guides the cartridge into position so that the ribbon
spools are centered in the holes of the cartridge and
there is .001" to .010" lateral movement of the cart-
ridge.
RIBBON SHIFT MECHANISM
5.
Ribbon Lift Guide Plate - Adjust the plate as low as
possible without causing a change in the ribbon lift guide
height as the ribbon lift lever is moved from the low lift
to the high lift position (Fig. 195). The ribbon lift cam
should be at the low point when the check is made.
Adi,ust Plate
Up Or Down
FIGURE 195. Ribbon Lift Guide Plate Adjustment
6. Ribbon Lift Control Link - Adjust the link forward or back
by means of the clevis so that the underscore will strike
the ribbon 1/16" from the bottom edge. The ribbon lift
lever must be in the high lift position when the check
is made.
CAUTION: Do not adjust the link so short that it chokes
off in the front end of the cam follower slot as the ribbon
lift lever is moved into the high lift position.
7. Ribbon Lift Lock - Adjust the ribbon lift lock so that it
will positively hold the ribbon lift guide in the load
position. The lock is located under the right front cor-
ner of the carrier.
'8. Stencil Lockout (Fig. 196) - With the lift lever in sten-
cil position and the cam follower on the high point of
the ribbon feed cam, form the ribbon feed latch for .010"
clearance with the lug on the cam follower.
2-57
I. Magnet Adjustments (2 Magnet) -
a. With the armatures energized, position the hinge
plates so that the armatures clear the magnet yokes
by .003" to .005" (Fig. 197).
Black Shift Armature
(Energized)
Hinge Plate
Hinge Plate
FIGURE 197. Hinge Plates
Red Shift
Armature
(Energized)
b. With the armatures energized, position the arma-
ture stops so that the armatures clear the magnet
yoke by .003" to .005" (Fig. 198).
Black Shift Magnet
Red Shift Magnet
FIGURE 198. Armature Stops