Spacebar Mechanism - IBM Selectric Manual

8.
Clutch Wheel
Release Arm Resting On High
Porti on of Tooth
Clutch Release Arm Bite
Insufficient clearance will cause the cams to be released
too early in the rearward travel of the interposers; con-
sequently the operational latch involved will not have
sufficient bite on the cam follower lever as it is operated
down at the rear. The operational latch may slip from
beneath the cam follower and result in an incomplete
operation. Excessive clearance could allow the inter-
poser to reach the I im it of its trave I before the cam is
released.
Form Lug
FIGURE 110. Clutch Release Arms Adjustment
NOTE: The clearance may be judged with the use of
the push end of the large spring hook. The end of the
spring hook is approximately.
035"
thick.
Interposer Restoring Bai I - Form the lug at each side of
the restoring bai-I so that the interposers wi II be restored
forward.
0] 0"
to
.030"
past the latch i ng point (Fig. ]]
1)
when either cam is operated. Be sure to check the in-
terposersateoch side and form the lug on the side being
checked.
The adjustment insures positive relatching of the inter-
posers without excessive overthrow.
NOTE: The lugs should be formed forward or back to
obtain the adjustment. Forming the lugs forward in-
creases the throw of the interposers.
41
.010" to .030"
FIGURE
111.
Interposer Restoring Bail Adjustment
1.
2.
SPACEBAR MECHANISM
All print escapement and operational control ad justments
must be correct before attempting adjustments of the
spacebar.
Spacebar Latch Lever Screw - Adjust the screw so that
.oorto .0]0" clearance exists between the escapement
trigger and the escapement torque bar (Fig. ]] 2). Dis-
connect the escapement trip link before making this ad-
justment.
This adjustment insures that the trigger wi II properly reset
over the lug on the escapement torque bar at the com-
pletion of each spacebar operation. It also insures that
there wi II be a maximum transfer of motion from the space-
bar operational latch to the trigger lever assembly, there-
by placing a suffi cient amount of wear potential into the
system (which is felt as trigger overthrow) .
• 007"
to
.010'~
- ' \
1~\'fL
\
Trigger
Adjusting Screw
~
-:v--
FIGURE
112.
SPacebar Latch Lever Screw
(Long Carriage)
On long carriage machines the trigger upstop should be
moved up out of the way when making this adjustment.
After completing the adjustment the upstop should be ad-
lustedsothatitclearsthetriggerlever by
.00]11
to
.005"
(Fig. 102).