IBM B-1 Adjustment Manual page 10

KEYLEVERS AND CAMS
1.
Cam clearance is adjusted for .015" to .020"
clearance between the nylon letter cams and power roll.
Adjust by loosening the upper screws on the
cam lever bearing support and pivoting the
support on its pivot screws (Fig. 14).
2. Adjust the KEYLEVE,R BE-ARINGSUPPORT up or
. down so that the keylevers will , trip their respective cams
when the keylevers are 1/32
11
+
1/64" from the bottom of
the keylever guide comb.
Adjust by loosening either both front or both
rear bearing support mounting screws slightly.
*Tap the loose screw or the support, up or
down with a screwdriver and hammer. This
method allows the slight change which is ne-
ces sary. * (Do not loosen both screws on either
end, as this will allow the support to lose all
adjustment). Check for proper tripping with
several keylevers at both e n d s""-of ;""; t he keyboard.
If, with correct tripping, some trip levers do
not restore, check adjustment
#1
above.
7
MODEL B1 ADJUSTMENTS
Check the adjustment by using tab cards (.007"
thick as a guage. Three cards (. 021") tight,
two cards (.014) loose (Fig. IS). Cam clear-
ance must be equal across all cams in order
to have uniform impression and keyboard touch.
Excessive clearance will cause failure of cams
to engage power roll as keylever bottoms, or
failure of trip lever to restore as key lever re-
stores. Insufficient clearance will cause weak
impression and repeating cams.
CAUTION: Any change in cam bearing sup-
port will affect functional cam c leara11ces. Be
sure to re-tighten locking screw after adjust-:-
ment is correct.