Cycle Clutch Mechanism; Shift Contact Assembly - IBM Selectric Maintenance Manual

6.· UC Armature Backstop (Fig. 39) - Positi on (armature at
rest) so that the UC armature clears the release arm fol-
lower by .002" to .008".
The clearance between the UC armature and shift re-
lease arm allows the armature to be in motion prior to
pi cking up the load of the release arm. With no clear-
ance the armature may fai I to pick.
6. I UC Armature Backstop (Late) (Fig. 39) - Position arma-
ture backstop {armature at rest} so that the UC armature
clears the release arm roller by .005" to .020".
FIGURE 39. U.C. Armature Backstop
7. Shift Contact Assembly C-7 (Fig. 40) -
--
Lay
a. C-7 Contact Rise - Form the N/C contact support
so that the
alp
lifts the NIC contact strap .002" to
.005" (Fig. 40).
.002" to .005" Rise
"'=!~~~~~~~~!~---
Follower Stud
Mounting Bracket
FIGURE 40. C-7 Contact
b. C-7 Contact Assembly - Adjust by moving its mount-
ing bracket so that the cam follower stud will be
.002" to .010" from the low point of the C-7 cam
at the vertical center line of the cam (all parts at
rest) •
CAUTION: Do not overtighten the C-7 cam set
screws as they wi II cause a bind or crack the ratchet.
Be sure the follower stud does not touch the ratchet
through 360
0
rotation of the ratchet.
CYCLE CLUTCH
I. Cycle Shaft - Shim the cycle shaft to obtain .001" 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 will rotate freely. Excessive play could allow a coil
of the cycle clutch spring to wedge between the two hub
members of the 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
I
main-
tain .002" clearance between the cycle shaft gear and
the left hand bearing.
2. 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.
41).
Hooverometer Handle
Cycle C
Latch Bracket
"L" Shaped
Handle Base Centered
Latch Pivot Pin
FIGURE 41. Cycle Clutch Latch Bracket Adjustment
To insure that the latch is parallel to the sleeve, itshould
be adjusted in the following manner.
a. Loosen the two latch mounting screws and pull the
.Iatch to the top of its ad justment.
b. Snug the screws "lightly".
c. Turn the print or cycle shaft in a print direction.
(This will force the cycle clutch sleeve down on the
cycle clutch latch.) Using the Hooverometer
I
check
the latch height until it is correct {#3 scribe line}.
d. Tighten the cycle clutch latch mounting screws.
Keeping the sleeve surface in contact with the latch sur-
face will insure that the latch will remain parallel to the
sleeve while you are adjusting its height.
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