IBM Selectric - Page 52

5.
Carrier Return Clutch ,A,rm - Ad just the arm on the carrier
return clutcharm hubsothatthe formed lug which mounts
the actuating arm stud will be horizontal when the ma-
chine is at rest (Fig. 147).
Carrier Return
Clutch Arm
Carrier Return Clutch
Arm Hub
Ad just Clearance For
.015" To .020"
(Horizontal)
Actuating Arm Stud
Clutch Actuating Arm
FIGURE 147. Carrier Return Actuating
Ann Adjustrnent
6. Shoe Clearance - The nylon shoe on the clutch actuating
armshouldclearthecarrierreturn clutch spring by .015"
to .020" when the machine is at rest (Fig. 147). Adjust
the self-locking nut on the actuating arm stud to obtain
the proper clearance.
7.
NOTE: I n no case shou I d the shoe to clutch spri ng
clearance be less than .015".
Overbank Adjustment - With the carrier resting at the
left margin stop, adjust the margin rack overbank guide
(Fig. 148) left or right on the margin rack to obtain a
clearance of .001" to .005" between the stop latch on
the carrier and the left hand margin stop. The floating
action of the stop latch must be removed, by pulling the
latch to the right with a spring hook, before this clear-
ance can be observed.
The ad justment ofthe overbank guide on the margin rack
determinesthe rest position of the margin rack. The ad-
justment insures that the left margi n stop wi II set accurate-
ly when the stop is sl id to the right against the margin
stop latch on the carrier. In addition; the ad justment
ofthe overbank guide, plus the amount of lateral motion
that the guide permits the rack (due to the design of the
guide) when the carrier moves into the left hand margin
duringa carrier return operation, automatically provides
the carrierwith the overbank required for proper escape-
ment pawl re-entry at the completion of a carrier return
operation.
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8.
Carrier Stop Latch
Margin Rack
Adjust Here
FIGURE 148. Margin Rack Overbank
Guide Adjus tment
Clutch Unlatching Link - With the margin rack held to
its left limit the carrier return latch keeper should clear
the latch by .001" to .015" at the unlatching point
(Fig. 149). Check by manually holding the latch atrhe
unlatching point while the machine is idling. Lengthen
or shorten the unlatching link to obtain this clearance .
.
001" To
9.
FIGURE 149. Clutch Unlatchillg Link
Torque Limiter - The torque limiter should transmit 1 to
2 pounds pull on the carrier as the carrier is unlatching
the clutch at the left margin.
If a spring scale is available, the adjustment may be
checked by holding against the carrier with the push
end of the scale and allowing the carrier to slowly un-
iatch the ciutch at the ieft margin.
I f no scale is avai lable, the torque may be estimated by
holding the carrier whi Ie the cl utch is engaged. The
torque limiter should slip readily yet return the carrier
positively without any hesitation when the carrier is re-
leased.
The adjustment is made by adjusting the eccentric stud
in the torque limiter hub. If sufficient adjustment is not
avai lable at the eccentric, the torque I im iter spring may
be shifted on the torque limiter hub by positioning the
torque limiter spring clamp.