IBM Selectric - Differential Guides

7.
8.
b. Early Style - Adjust the restoring lever so that the
latch pawl overthrows the keeper by .030" to .045
11
(Fig. 7).
Widen Notch To Increase Overthrow
FIGURE 7. Cycle Clutch Latch Restoring Adjustment
Cycle Clutch Release Point - Adjust the cycle clutch
keeper vertically for. 002" to .008" clearance between
the pawl and the keeper with the H interposer latched
down. The clearance must be observed at the point of
unlatching because it increases as the latch moves for-
ward (Fig. 8).
Prevent The Latch From
Moving Forward While
Observing The Adjustment
FIGURE 8. Cycle Clutch Release Point Adjustment
Too much clearance indicates that the clutch is being re-
I eased too earl yin the trave I of the interposer. Erroneous
se
lection can occur because a fl icking action on the key-
levers can cause the cycle clutch to be released without
latchingan interposerdown. As a result, the filter shaft
will not drive an interposer forward and the hyphen or
underscore wi II be printed.
Insuffi cient clearance does not insure that the clutch wi II
be released when an interposer is latched down. If an
interposer is latched down without releasing the clutch,
the keyboard wi II be locked because the interposer wi II
remain in the compensator. The keyboard can be unlock-
ed only by depressing the latched interposer a second
time sufficiently to unlatch the clutch.
Interposer Latch Spring Adjustment, Final - Position the
left and right interposer latch spring sections vertically
so that the .002" to .008" latch pawl to keeper clear-
ance is maintained with various interposers latched down.
NOTE: Adjusting the interposer latch springs by this
method provides a simultaneous interposer latching with
respect to cycle clutch release foral! interposers. It also
compensates for any deviation in parallelness between
the rear interposer guide comb and l'he cycle bail.
The interposer latch springs are adjusted as low as possible
to minimize "flicking". "Flicking" is caused by the in-
2-3
9.
10.
terposer fai I ing to remain in the path of the fiiter shaft
vane when the shaft is operated. By adjusting the lotch
springs as low as possible, a lower cycle clutch release
point can be achieved. This helps to minimize IIflicking"
because the interposer must now travel further into the
path of the filter shaft vane in order to release the cycle
clutch and remains in the path of the filter shaft for a
longer period of time during a 11ft icking" condition.
Cycle Clutch Latch Pawl Bite - Adjust the cycle clutch
bail upper stop to provide .030" to .035" bite between
the latch pawl and its keeper (1/2 the thickness of the
keeper) (Fig. 9).
Cycle Clutch Bail Stop
/
.035" ~
\
~~-1
/
FIGURE 9. Cycle Clutch Latch Pawl Bite Adjustment
The bai I stop is mounted with two nuts and two screws.
These nuts and screws also control the position of the
character interrupter bail plate. In order to adjust the
cycle clutch bail stop it is only necessary to loosen both
nuts and the front screw. Do not loosen the rear screw.
Insufficient bite increases the possibi I ity of a repeat cycle
because positive latching is not insured. Excessive bite
wi II affect the touch of the keyboard because the lotch
pawl must be moved farther in order to trip the clutch.
Front Keylever Guide Comb - Position the guide comb
vertically to allow the keylevers to travel .010
11
to
.020
11
after the keylever pawl resets (Fig. 10).
NOTE: An individual keylever may be adjusted by open-
ing or closing the horseshoe slot on the keylever.
CAUTION: Movement of the front keylever guide comb
wi II affect the adjustment of the operation keylevers.
The character interposer should not bottom in the rear
interposer guide comb slots when the keylever bottoms in
the front keylever guide comb. This could result in a
keyboard touch problem and possibly keylever pawl
breakage.
.010" to .020"
FI GURE 10. Front Keylever Guide Comb