Operational Control Mechanism - IBM Selectric Maintenance Manual

Position to Governor
Pinion For .00211 to
.004 11 Backlash
Operational Shaft
Tab Pinion Gear CollarR
Tab Governor Spring
Tab Governor Arbor
FIGURE 109. Tab Governor Pinion
3. Cord Tension - With the cords properly threaded (Figs.
110 A & B)
I
adjust the carrier return cord drum so that
the pulley pivot screw nut clears the pulley bracket by
1/8"
to 1/4" (Fig. I1OC).
A time saving method of transport card adjustment may
be accomplished by tying a knot in the end of the cord
as close to the hook as possible.
II
I
,I
.~-._'.
- - - - - - - - - - . - 'r-)
- - - - - - - - _ _ _ - - JII--f
, I , ,,~
,)'-~
-
(
L~--
~
\'-- - -
---
FIGURE 1 lOA. Carrier Return Cord
il
, _ . . . J . . J _
..JI
-
---,.
Ii
) ' ' ' ' ' ' =l
\,-
- - - - - - - - -
.
.
\~---------:
~~
I
- e..
\~~
I
b \
I
4 I
=::/
I~
FIGURE 110B. Escapement Cord
The position of the pulley insures that it wi II not con-
tact the cover as it compensates for the cord stretch.
Adjusting the pulley nearer the powerframe puts an un-
necessary load on the cords.
CAUTION: Be sure to remove all end play from the
dS-
capement shaft before tighteni ng the carri er return cord
drum. End play is removed by holding the escapement
shaft forward while the cord drum is moved to the rear
against the rear bearing.
2-35
"
FIGURE 110C. Cord Tension
CAUTION: The mainspring should be handled carefully
to prevent it from sl ipping when the tension is being in-
creased or decreased. The outside loop of the main spring
must not be in a position to contact C-5.
NOTE: The eccentric mounting stud for the trontidler
pulley should be set so that the pin is horizontal and a-
bove center on the eccentri c. The pin will then be
ang led toward the left slightly.
4. Mainspring Tension - The mainspring tension should be
1/2 to 3/4 pounds measured at the carrier as it escapes
through the line lock load at the extreme right hand mar-
gin. Adjust by turning the mainspring cage. The capac-
itor (if present) and the cage stop screw must be removed
in order to make the adjustment.
NOTE: An approximate setting can be obtained by
making 5 full turns on the mainspring with the carrier at
the extreme right hand limit of its travel. On printers
with 100 inch mainspring 6-2/3 to 7-2/3 turns will be
necessary. The 100 inch mainspring is stamped on the rear.
OPERATIONAL CONTROL MECHANISM
1 • Keylever Pawl Overlap - Adjust each keylever pawl
guide stud so that all the keylever pawls verlap their
respective interposers by .035" to .045" with both parts
at rest (Fig. 111) .
FIGURE 111. Keylever Pawl Overlap Adjustment