IBM Selectric - Page 47

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FIGURE 100A. Detent Cam Follower Bracket
b. Vertically so that the bottom surface of the pin on
the cam follower I ines up with f'he scribe line #1 on
the Hooverometer when t,he Hooverometer is placed
against the pri'nt sleeve as shown in Figure 1 OOb.
This bracket is set at the factory with (J dial indicator and
should not require readjustment unless it becomes loose.
NOTE: The position of the bracket directly affects the timing
relationship between the detent cam and the print cam . .An
improperly adjusted bracket may cause the detents to begin to
withdraw before the typehead prints, or the typehead to print
Detent Cam Follower Bracket
FIGURE 100B. Detent Cam Follower Bracket
before the detents have fully seated. If this occurs it will
generally show up as poor vertical al ignment because the tilt
detent always seats and withdraws ahead of the rotate detent ..
10.
Detent Mechanism (Machines prior to gearless ti It) The
detent mechanism must be adjusted to satisfy the follow·-
ing conditions:
a. Position the ribbon feed and detent cam left or right
on the print sleeve so that the inside rib of the caOi
wi II be in I ine with the left hand edge of the ribbon
feed cam follower (Fig. 101 A & B).
Detent Cam
Edges Even
Ribbon-Cam Follower
FI GURE 101 B. Ribbon Feed Cam (Early)
These Two Edges Eve
Cam Follower
2-29
FIGURE lOlA.
Ribbon Feed Cam (late)
b. Adjust the detent actuating lever support front or
rear (under its locking screw) so that the rotate
detent will clear the teeth on the type head skirt
by .025" to .035" when the cycle shaft is at rest
(Fig. 102). This clearance should be observed when
the type head is manually tilted to a two ti It po-
sition since the two tilt position provides the rotate
detent with the least amount of motion.
+=~
.025" to .035" '--
FIGURE 102. Skirt Clearance