IBM Selectric I/O Reference Manual page 26

If the bracket were adjusted too low, the steps would be
at an angle to the line of motion of the cycle clutch
latch. The latch would have difficulty in moving for-
ward to release the clutch sleeve, and a slow, hesitant
operation would result.
With the bracket too high, the force of stopping the
cycle shaft through the cycle clutch sleeve would tend
to cam the latch forward. A repeat cycle operation
cou Id resu It.
When properly adjusted the top of the latch pivot pin is
1
.546"
below the top of the print shaft. This distance
can be measured with the use of the Hooverometer. With
the head of the Hooverometer set at the #3 scribe line,
the head should rest on top of the print shaft with tl-e
handle touching the latch pivot pin (Fig.
41).
Be sure
the Hooverometer handle is vertical. It will be vertical
if the base of the handle is centered over the latch pivot
pin.
NOTE: Changing the height of the cycle clutch latch
necessitates a readjustment of the cycle clutch collar,
cycle clutch stop, and the cycle clutch latch restoring
mechanism.
CAUTION: The latch bracket must not become cocked
so that only
a
corner of the latch plare is stopping the
sleeve. Excessive wear could result. The cycle clutch
sleeve could also be ti Ited by the latch causing it to
bear against the cycle clutch pulley hub creating a
. noi sy operati on.
3.
Cycle Clutch Spring and Collar Adjustments
a.. Latera
I
position of the spri ng - Loosen the collar
and position the spring left or right on its hubs so
that the right hand end of the spring wi
II
clear the
face of the cycle clutch pulley by .004" to .012"
(Fig. 42).
NOTE: This adjustment insures that a maximum
number of coils of the spring clutch will grip the
driving hub during a cycle operation. Any slip-
page between the driving hub and the spring clutch
could decrease the typehead velocity during a
print operation resulting in intermittent light
im~
pression. A lack of clearance between the right end
of the spring clutch and the face of the cycle clutch
Sleeve
Collar Adjustment
Pulley
Cycle Clutch Spring
Sleeve End Play
FiGURE 42.
. . . I
r"'Io • • •
r . l , . . _
I _
LaTeral I"'OSITlOn or rne \..YCle
Clutch Spring and Collar
pulley would create a bind causing the spring clutch
to place a heavy torque on the cycle clutch sleeve.
This excessive torque on the sleeve results in a
sluggish operation because the cycle clutch latch
trip lever has difficulty tripping the latch off the
sleeve.
b. Lateral positi on of the collar - positi on the collar
left or right so that the sleeve will have .010" to
.015" end play.
NOTE: This adjustment insures that there wi
II
be
no binds between the right end of the sleeve and the
cycle clutch pu lIey. A bind wi II c.ause a sluggish
operation just as in the previous adjustment.
c. Radial position_of the collar - (The position of the
collar directly controls the radial position of the
left hand end of the cycle clutch spring with respect
to the cycle shaft.
It determines how much the
clutch spring wi
II
be expanded when the cycle
clutch is latched and the cycle shaft is in its
rest positi on). Adjust the collar so that when a zero
ti It, negative-five rotate character is hand cycled
the cycle clutch spring will begin to slip (expand)
when the cycle shaft is 1/16" to
3/32"
from its rest
position measured on the surface of check ratchet
(Fig.
43).
This adjustment is difficult to observe at the check
ratchet. A 1/16" to
3/32"
rotation of the cycle
shaft wi II cause the print shaft gear to turn approxi-
mate
y
one tooth. The adjustment can easily be
read by one of the following methods.
Cycle Clutch
Check Ratchet
Note: The positive cams are
almost horizontal when the
1/16" To
3/32
11
cycle clutch is latched.
FIGURE 43. Radial Position of Cycle Clutch Collar
A. Print Shaft Gear Method
1. Hand cycle a zero ti
It,
negative-five character
until the cycle clutch begins to slip.
2. Penci I mark the print shaft bearing in line with
a tooth on the gear.
3. Release the cycle clutch again by depressing
a selection magnet armature.
2-11