Latch Pusher Assembly - IBM Selectric Maintenance Manual

6. Differential Guides
a. The rotate and tilt differential guides should be ad-
justed left or right so that the vertical links of the
two systems hang in a true vertical position (Fig.
3).
The guide for the rotate differential is attached to
the top of the differential mounting bracket by two
screws just behind the balance lever. The screws
are accessible from the rear with the motor removed.
The tilt differential guide is attached to the bottom
of'the differential mounting bracket and is easi Iy
accessible from beneath the ~achine.
Rotate Differential links _ _ ~!0'i
Must be Vertical
Adjust the Guide left or Right
to Obtain Proper Adjustment
Tilt Differential Unks
Must be Vertical
Adjust the Guide
left or Right to
Obtain Proper
Adjustment
FIGURE 3. Selector Latch Guides
b. The latch bail guide should be adjusted left or right
so that all positive rotate and tilt selector latches
hang vertically in the latch bail. The guide is at-
tached to the lower left corner of the differential
mounting bracket (Fig.
4).
Adjust Guide left or Right latches must be vertical
So All latches qre Vertical
FIGURE 4. latch Bai I Guide
7. latch Bail Stop -The latch bail stop (Fig. 5), located
just beneath the bail, prevents the bail from getting be-
neath the selector latches. Adjust the stop to clear the
latch bail by .005" to .015" when the bail is at the high
point of the cycle shaft cams.
2-2
latch Bail
/
-~
?
:::::::~~'"-..,;-._.n..,
..
rI·hrr'w
Stop
FIGURE
5.
latch Bail Overthrow Stop
NOTE: Excessive clearance will allow the bail to
overthrow at the high point of the cams. During the
overthrow it is possible for the latches to get on top of
and bi nd off the bai
I •
8. Selector latch link - With the machine at rest adjust
the negative 5 latch link so that the negative 5 latch
wi II overlap the stop screw head by .050" to .060" (Fig.
6).
Adjust link To Obtain
Desired Negative latch
Cam Shaft
To Stop Pad Screw Overlap
I
Slightly less Than
1/2
latch Thickness
.050" To .060"
FIGURE 6. Negative latch link
Adjusting the I ink too short can result in erroneous selec-
tion because the latch will not have a secure bite on the
negative-five stop screw. The force of operation could
cause the latch to slip off part of the way through a cy-
cle and cause a noisy operation as well as erroneous se-
lection.
LA TCH PUSHER ASSEMBLY
NOTE:
a. Do not remove pusher plate unless replacement of
the plate is required.
b. The selector latch link adjustment (Fig. 6) must
be
correct before making the pusher to latch extension
adjustment.
c. When removal of the Latch Pusher Assembly is re-
quired, scribe (for reinstallation reference) the
pusher plate to powerframe relationship. If the
original relationship can be maintained, the adjust-
ments wi II not have been destroyed by remova I. In
case of loss of relationship, position the pusher