Operational Control Mechanism - IBM Selectric Reference Manual

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.
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--=-JFIGURE 156B.
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Escapement Cord Threading
W
1-=
1/8"
to
1/4"
,-
FIGURE 156C. Cord Tension
The position of the pulley insures that
H
will not contact
the cover as it compensates for the cord stretch. Adjust-
ing the pulley nearer the powerframe puts an unnecessary
load on the cords.
CAUTION: Be sure to remove a II end play from the
escapement shaft before tightening the carrier return
cord drum. End play is removed by holding the escape-
ment shaft forward whi Ie the cord drum is moved to the
rear against the rear bearing.
NOTE: The eccentric mounting stud for the front idler
pulley should be set so that the pin is horizontal and
above center on the eccentri c. The pin wi" then be
angled 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 ordAr to make the adjustment.
NOTE: An approximate setting (for all machines except
100 inch mainspring) 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.
(100 inch spring has 100 stamped on mainspring cage).
CAUTION: The mainspring should be handled care-
fully to prevent it from sl ipping when the tension is be-
ing increased or decreased. The outside loop of the main-
spring musf not be in a position to contact C-5 .
OPERATIONAL CONTROL MECHAN 15M
1. Keyleyer Pawl Overlap - Adjust each keylever pawl
gui de stud so that a II the keylever pawls, except the
index keylever pawl, overlap their respective interpo-
sers by .035" to .045" with both parts at rest (Fig. 157).
The index keylever pawl guide should be adjusted for
.040" to .050" overlap. The overlap insures proper
repeat/non-repeat action •
• 035
11
to .045"
(Index Keylever Pawl
Requires .040" to .050")
FI GURE 157. Keylever Pawl Overlap Adjustment
2. Keylever Pawl To Interposer Clearance
a.
b.
c.
Adjust the height of the interposers by positioning
the keylever pawl gui de bracket up or down to ob-
tain a clearance of .020" to .025" between the
index keylever pawl and the index interposer at
rest (Fig. 158). The keylever pawl gui de bracket
should be kept horizontal.
The adjusting slot in the carrier return, backspace
and tab keylevers should be formed to obtain.020"
to .025" clearance between the keylever pawl
and the interposer at rest (Fig. 158).
Adjust spacebar lever eccentric with the high part
forward to obtain a keylever pawl to interposer
clearance of .005" to .015" (Fig. 158).
.020" to .025" For Index
.020" to .030" Others
.005" to .015" 5 B
Keylever Pawl
Guide Bracket
FIGURE 158. Keylever Pawl To Interposer
Clearance Adjustment
2-55