IBM Selectric - Page 36

NOTE: This adjustment may be checked by al-
ternately cycl ing a low and high velocity character
after applying a light film of #17 grease to both
lobes of the print cam. Observe the tracking of
the roller in the grease to determine if the roller is
shifting properly. Make certain that the roller re-
stores fully under the high velocity lobe when the
machine is at rest.
9. Low Velocity Latch Link - Adjust the low velocity latch
fTnk(Fig. 89) inthe followingmanner: With the machine
latched at rest and the low velocity latch held against
the adjusting stop on the cam follower, match the pin
clevis on the link with the hole in the latch. When
matching the clevis, be sure to hold the I ink toward the
rear of the machine so that the low velocity vane will be
against the tail of the interposers.
/ -:" ____ Link
Low
Velocity Cam
FIGURE 90.
Low Velocity Cam Adjustment
c. Tighten the lowvelocitycam set screws. Make sure
that the cam does not move in relation to the fol-
\. - - - - j lower. Also make certain that the cam is positioned
I laterallyonthe filtershaft so that it is centered be-
~ -I ~ tween the cable anchor bracket and the shi ft release
,."".- ---" .........
"
" .,.-
'(
I
\
\
I
I
, /
'" ,/
Stop _____ "'/
FIGURE 89. Low Velocity Latch Link
NOTE: The link adjustment insures that the latch will
takea full bite on the adjusting stop and that there will
be no lost motion in the system.
10. Low Velocity Cam Adjustment - The cam should be ad-
justed radially on the filter shaft so that the following
condition will exist: When a low velocity character is
slowl y
hand-cycled, the low velocity latch should clear
the adjusting stop on the cam follower by .008" to .012"
(Fig. 90) just as the cam follower begins to move down
off the hig~ dwell of the low velocity cam. Advance
or retard the cam to satisfy this condition.
This adjustment can be easily made in the following
manner:
a. Slowly hand-cycle a low velocity character until
one of the scribe marks on the cam is in line with
thecenteroftheshoeon the cam follower {Fig. 90).
b. Without moving the cam, loosen its set screws and
then sl ightly dclvance or retard the filter shaft (with-
in the cam) until the .008" to .012" between the
latch and the stop is obtained. Advancing the filter
shaft will increase the clearance; retarding will
decrease it.
34
arm.
NOTE: This adjustment insures that the print cam
followerrollerwill shift to the I~w velocity lobe at
the earl iest possi ble time during a low velocity pri nt
cycle.
CAUTION: "Safety" - be sure to disconnect the
I ine cord before attempting to rotate the fi Iter shaft
by hand.
11. Low Velocity Cam Follower Stop - With the cycle shaft
latchedatrest, adjustthe stop for .008" to .012" clear-
ance with the low velocity latch (Fig. 91). Loosen the
binding screw "A" to make this adjustment.
Cam Follower Stop
FIGURE 91. Cam Follower Adjusting Stop