Operational Feedback Contacts; Spacebar Mechanism - IBM Selectric Reference Manual

3.
1.
2.
3.
Adjusting Plates (Fig. 181.3) - The acl'uator 'latch ad-
justing plates should be adjusted so that the actuator
latches clear the rise on the actuator by .005" to .015"
(With the operational cams latches (Jt rest).
FIGURE 181.3 Adjusting Plcltes
OPERATIONAL FEEDBAC
K
CONTACTS (C-5, C-6)
Position the O/P's centra Ily under t'he actuator tabs
(Fig. 182).
--- ---
./ 15 Inch
/ Machines
Only
!
C6
!
Auxiliary Cam Follower
\
Center Cam Follower
Actuator Tabs
\
)
/ /
C6
Operating Straps
FIGURE 182. Operating Straps
Form the N/C supports so that the a/p's lift the N/C
contacts .002" to .005" (Fig. 183).
Form the N/O supports for .035" to .045" air gaps be-_
tween the O/P and N/O contacts (Fig. 183) .
• 002" to .005" Rise
N/C Contacts
.035" to .045
11
Air Gap
NOTE: .035" to .045" air gap may have to be altered to
obtain timing.
FIGURE 183. Feedback Contacts
4.
Form or adjust the contact mounting bracket (up or
down) for make and break times (Fig. 183). Refer to
the timing charts for contact timing and duration.
TIMING CHART
C-5 N/O C-6 N/O
Machine Make Break Make Break
t - - - - - - + - - - - - - - - - t - - - - - - - - - - - - ---
ET 731 155
±
5
ET 735 55 ± 5
MTST -775 155 ± 5
I
130
±
5
130 ± 5
130 ± 5
170 ± 5
170 ± 5
170 ± 5
FIGURE 184. Timing Chart
SPACEBAR MECHANISM
305
±
5
305 ± 5
305 ±
5
1. All print escapement and operational control adjust-
ments must be correct before attampting adjustments of
the spacebar.
2. Spacebar Latch Lever Screw - Adjust the screw so that
.007" to .010" clearance exists between the escape-
ment trigger an d the escapement torque bar (Fig. 185A) .
Disconnect the escapement trip link before making this
adjustment.
~ r
- . . . ' \
Trigger
(~
\ Torque
Bar
.........
_ /
.007" to .010"
.:;;;jjjjj~~"~~
(15" Machine)
Trigger
Assembly
(11" Machine)
Adjusting
Screw
Spacebar
Latch
FIGURE 185A. Spacebar Latch Lever Screw
2-63