IBM Selectric - Page 53

NOTE: The carrier return clutch arbor should have an
end play of .004" to .006" between the torque limiter
hub and the C-clip on the operational shaft. Adjust the
play by positioning the torque limiter hub laterally on
the shaft. The end play can be adjusted easily if the
torquelimiterspringismoved to the right, off the torque
limiter hub.
1. All operational control adjustments must be correct be-
fore any attempt is made to adjust the index mechanism.
2.
Multiplying Lever Stop - (Fig. 150)
a. On machines equipped with either 27 or 54 tooth
ratchets, adjust the multiplying lever stop front or
rearto produce. 370" to. 390" (approximately 3/8")
motion to the index I ink when the carrier return/in-
dex cam is operated to its high point (platen removed).
b. On machines equipped with a 24 tooth ratchet, ad-
just the multiplying lever stop front or rear to pro-
duce .400" to .420" (approximately 13/32") motion
to the index I ink when the carrier return/index cam
is operated to its high point (platen removed).
.370" To .390" For 27 And 54 Tooth Ratchets
.400" To .420" For 24 Tooth Ratchets
FIGURE 150. Multiplying Lever Stop (New Style)
NOTE: This adjustment may be measured with the
Hooverometer and a feeler gauge. The handle of
the Hooverometer is .375" wide. For 27 and 54
tooth ratchets the .370" to .390" motion can be
measured by
the width of the Hooverometer handle
plusa .015" feeler gauge. For the 24 tooth ratchet
the .400" to .420
11
motion can be measured by the
width of the Hooverometer handle plus a .035
11
feeler gauge.
Figure 151 illustrates the first level multiplying lever
stop used on the new style index mechanism. This
stop should be adjusted both horizontally and ver-
tically. The stop is adjusted vertically so that the
multiplying lever will operate above and below a
horizonta I position by an equal amount. The hori-
zonta and vertical adjustments of the stop must be
made alternately until both are correct.
52
Multiplying Lever Stop
.370" To .390" For 27 And 54 Tooth Ratchets
.400" To .420" For 24 Tooth Ratchets
FIGURE 151. Multiplying Lever Stop (Early Level)
3.
Index Link - Use the following procedure to adjust the
index link:
a. As a preliminary step, loosen the platen overthrow
stop and move it to the rear (Fig. 152).
Platen Overthrow
Stop Moved To The
(Index Opetation Manually
Rear ~~S'~\
'i, ~:" ~.~ ,~~r~at~e: Through)
4.
{ 0
/
" . "
\~~;f;,;-;'
~~RO
\ I
Detent He Id Disengaged
IJ.-- Index Link
FIGURE 152. Index Link Adjustment
b. With the platen installed, hold the detent roller
disengaged from the platen ratchet with a spring
hook
while an index operation is manually cycled.
At the completion of the operation allow the detent
roller to re-enter the platen ratchet. If the index
link is properly adjusted the detent roller will seat
between two ratchet teeth without causing any ro-
tational motion to the platen. Adjust the link to
obtain this condition.
Platen Overthrow Stop - With the index cam rotated to
its high point, adjust the platen overthrow stop to clear
the index pawl by .005" (Fig. 153).