Latch Pusher Assembly; Print Selection Magnet Assembly, Early - IBM Selectric Reference Manual

LATCH PUSHER ASSEMBLY
NOTE:
1.
2.
3.
a. Do not .remove pusher plate unless replacement of
the plate is required.
b. The selector latch link adjustments (Figure
#IS
19,
20, and 23) must be correct before making any
pusher to latch extension ad justments.
c. When removal of the Latch Pusher Assembly is re-
quired, scribe (for reinstallation reference) the
pusher plate to power frame relationship. If the
original relationship can be maintained, the ad-
justments wi II not have been destroyed by removal.
In case of loss of relationship, position the pusher
plate as nearly as possible for the prescribed latch
to pusher clearances (Fig. 25A) and proceed with the
following adjustments.
Pusher Bail Eccentrics (Fig. 24) - Adjust so that the top
edge of the follower arms are fl ush with the pusher bai I.
These Surfaces FI ush
Eccentric
Follower Arm
FI GURE 24. Pusher Bai I
Latch Pushers T2, Tl, R2, Rl,
&
R5 (Fig. 25A)-Formto
clear their respective latch extensions by .025" to
.035".
Latch Pusher, R2A (Fig. 25A) - Form to clear latch exten-
sion by .040
11
to .050
11
•
.040
11
to .050
11
-
R2A
I I~
I
.025
11
to .035
11
-
T2, Tl, R2, Rl, R5
~~~~,USher
Extension
a~
Form Within Circled Arecl
FIGURE 25A. Latch Pushers
Malselection or parity errors may be caused by the latch
pushers contacting their latch extensions when an un-
selected pusher is against its armature. There should be
a minimum of .002
11
clearance (Fig. 25B) between the
pusher and the latch extension when the, pusher is against
its armatu,"e. To check this adjustment, turn machine
power off, trip the cycle clutch, and hand cycle a few
degrees through a cycle. The pusher cam follower
should be on the low dwell of the pusher cam.
2 .. 7
4.
Latch Extension
FI GURE 25B. Pusher Clearance
Check Latch Pusher (Fig. 26) - Form so that the check
latch clears the selection bail by .020 11 to .030 11
•
This
clearance must be observed with the selection bail lower-
ed slightly.
Check Latch Extension
selection~
' 0 2 0 , ~ : : C h o : ~ ' :
--1r-
§~~
Form Within Circled Area
FI GURE 26. Check Latch Pusher
Adjustments 2,3 and 4 along with the Print Magnet armature
to Pusher adjustments insure that the pushers will not contact
the latch extensions when the latches are active (pulled down
by the bai I) •
PRINT SELECTION MAGNET ASSEMBLY. (EARLY STYLE)
NOTE:
For complete ad justment, the magnet unit shoul d be re-
moved. To prevent interference from the trip bail, turn
the high points of the pivot eccentrics to the top.
1. pj'vot Plate (Fig. 27) - Adjust for a clearance of .001"
to .006" between the yoke and armatures with the arm·-
atures manually attracted. Measure clearances at the
outside armatures (T2
&
R5).
2. Guide Plate (Fig. 27) - Position as follows: