IBM Selectric - Page 24

NOTE: On the late style, be sure that the left to right
position of the front interposer mounting bracket is such
that the latch I inks wi II exert a straight pull on the
selector latches.
The latch interposer stop lugs establish a position for the
latch interposers so that the correct adjustment of the
selector latch I inks can be obtained. Selection timing
will be directly affected by an erroneous stop lug adjust-
ment.
16. Selector Latch Links
a. With the machine at rest adjust the negative 5
latch I ink so that the negative 5 latch wi II overlap
the stop screw head by .050" to .060" (Fi g. 19).
Adjust Link To Obtain
Desired Negative Latch
Cam
Shaft
To Stop Pad Screw Overlap
j
Slightly Less Than
1/2 Latch Thickness
• 050" to .060"
FI GURE 19. Negative Latch Link
b. Withthemachine at rest adjust the tilt and positive
latch links so that their latches will overlap the
latch bail with .005" to .015" overhang (Fig. 20).
Interposer Against Stop
.005" To .015"
FI GURE 20. Ti It and Positive Latch Links
Adjusting a I ink too short can result in erroneous selection
because the latch wi II not have a secure bite on the latch
bail plate (or negative-five stop screw). The force of
operation coul d cause the latch to sl i p off part of the way
through a cycle and cause a noisy operation as well as
erroneous selection.
17. Check Latch
a. Upstop (Fig. 21) - With the selector cams at the low
point, form the upstop so that the latch clears the
bail by .020" to .025".
2-6
FIGURE 21. Check Latch Upstop
Insuffi cient clearance may cause the check latch to
fai I to reset under the bai I plate. It may allow the
check latch to get on top of the bail and bind off
the bail .
b. Spring Return Arm (Fig. 22) - Position to hold the
pivot arm against the upstop.
FIGURE·· 22. Check Latch Spring Return Arm
c. Check Latch Link - With the machine at rest adjust
the check latch link so that the check latch clears
the bail by .001" to .010" (Fig. 23).
Latch
Latch Link
.001" to .010" ____ ~
Bail
FIGURE 23. Check Latch Link