IBM Selectric - Page 5

b. Old Style - Adjust the restoring lever so that the
latch pawl overthrows the keeper by .030" to .045"
(Fig. 7).
Cycle Clutch
Cycle Clutch
Latch Pawl
Restoring Lever
Widen Notch To
Increa~e Overthrow
FIGURE 7. Cycle Clutch Latch Restoring Adjustment
7.
Cycle Clutch Release Point - Adjust the cycle clutch
keepervertically for .000" to .002" clearance between
the pawl and the keeper with the +/= interposer latcLt:d
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
8.
Too much clearance indi cates that the clutch is being re-
leased too early in the travel ofthe interposer. Erroneous
selection can occur because a fl icking action on the key-
levers can cause the cycle clutch to be released without
latching an interposer down . As a result, the filter shaft
wi
II not drive an interposer forward and the hyphen or
underscore wi II be pri nted .
Insufficient clearance does not insure that the clutch will
be rele~sed when an interposer is latched down. If an
interposer is latched down without releasing the clutch,
the keyboard will be locked because the interposer will
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 .000" to .00211 latch pawl to keeper clear-
ance is maintained with various interposers latched down.
9.
3
NOTE: Adjusting the interposer latch springs by this
method provides a simultaneous interposer latching with
respect to cycle cI utch release for all interposers. It also
compensates for any deviation in parallelness between
the rear interposer guide comb and the cycle bail.
The interposer latch springs are adjusted as low as possible
to minimize IIflicking
ll
• IIFlicking
ll
is caused by the in-
terposer fai I ing to remain in the path of the filter shaft
vane when the shaft is operated. By adjusting the latch
springs as low as possible, a lower cycle clutch release
point can be achieved. This helps to minimize IIfi icking
ll
because the interposer must now travel further into the
path ofthe 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 IIflicking
ll
condition.
I
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
.030
11
to .035"
FIGURE 9. Cycle Clutch Latch Pawl
Bite Adjustment
The bail 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.
FIGURE 10. Front Keylever Guide Comb