IBM Selectric - Cycle Clutch

Feedback Contact"
C-4
Actuator -------"o!I-I-w
Form These Tabs
F
I GU RE 86. Actuator Tabs
TIMING CHART
Shift N/O Make
Break
C3 & C4
35° ± 5°
145° ± 5°
Note: Each Shift operation is 180°
7. Mode Contact Actuating Arm - With the shift ratchetre-
leased, hand cycle from lower to upper case and adjust
as follows (Fig. 87).
Mode Contact Assembly
\
#1 Mode
Actuating Arm
LC-l
Shi ft Arm
#2 Mode
FI GURE 87. Mode Contact Actuating Arm
TIMING CHART
Shift
N/O-Make
Break
Mode
{,'1
80° ± 10°
100° ± 10°
Mode #2
130
0
±10°
50° ± 10°
Note: Each Shift operation is 180°
a. Position the actuating arm so that the UC-1 contact
closes at 80° of shift cam rotation.
Note: Form actuating arm on machines with IILate Style"
shift arm.
b. Form the actuating tab so that the UC-2 contact
closes at 130° of shift cam rotation. For Model 775
(MT/ST) Mode #3, use Mode #2 specifications.
NOTE: The shift ratchet teeth are spaced 10° apart and may
be used as a
timing indicator.
CYCLE CLUTCH
1.
2.
Cycle Shaft - Shim the cycle shaft to obtain .0011.1 to
.003" end play of the shaft. The shims are placed be-
tween the left hand bearing and the check ratchet. The
shims
are available in various thicknesses and are coded
by shape as described in the Parts Catalog.
CAUTION: The slight end play of the shaft insures that
it wi II rotate freely. Excessive play could allow a coil
ofthe cycle clutch spring to wedge between the two hub
membersofthe clutch causing a machine lock-up. (End
play can most easily be measured with the spring clutch
removed.)
NOTE: With the end play removed to the right, maintain
.002" clearance between the cycle shaft gear and the
left hand bearing.
Cycle Clutch Latch Bracket - Adjust the bracket ver-
tically so that the steps of the cycle clutch sleeve are
horizontal when the sleeve is stopped by the latch
(Fig. 88).
Hooverometer Handle _-lJIII!Io.'::::;:::::::::::1
#3 Scribe Une
Handle Base Centered·
On Latch Pivot Pin
FI GURE 88. Cycle Clutch Latch Bracket Ad justment
2-23