IBM Selectric - Page 16

9.
The side play exists between a C-clip around the shaft
at the right of the rocker and a thrust washer against the
carrier casting at the left of the rocker. The rocker shaft
isheld in place byasetscrew at the left end of the shaft.
Excessive play in the rocker could affect horizontal align-
ment by allowing the rocker to shift its position left to
right.
Print Sleeve End Play - Adjust the print sleeve end play
to be .002" to .004". The end play is controlled by the
print cam on the right hand end of the sleeve. The ad-
justment should not be gained with the ribbon lift cam
because its set screw tightens down into a dimple in the
print sleeve fixing the position of the cam (Fig. 39) .
. 002" To.004"
End Play Adjust By Print Cam
FIGURE 39. Print Sleeve End Play
On machines equipped with an impression control lever
just the opposite is required: the set screw in the print
cam tightens down into a dimple in the print sleeve and
the end play of the print sleeve is gained by laterally
positioning the ribbon liftcamon the print sleeve. Also,
the print sleeve key must be positioned to the extreme
left of the keyway slot in the print sleeve before the
detent cam set screw is tightened down on the key.
Detent Cam Follower Bracket - Position the detent cam
follower bracket which is mounted to the left side of
the carrier by two screws to satisfy the following con-
ditions:
a. Front to rear for a clearance of .015" between the
print sleeve and the end of the pin on the cam fol-
lower (Fig. 39a).
Print Sleeve \J@2§.f
Bracket
FIGURE 39a. Detent Cam Follower Bracket
14
b. Vertically so that the bottom surface of the pin on
the cam follower lines up with the scribe line #1 on
the Hooverometer when the Hooverometer is placed
against the print sleeve as shown in Figure 39b.
I+---- Hooverometer
H ./1 #1 Scribe line
Detent Cam Follower Bracket
FIGURE 39b. Detent Cam Follower Bracket
This bracket is set at the factory with a 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
before the de tents have fully seated. If this occurs it will
generally show up as poor vertical alignment because the tilt
detent a Iways seats and wi thdraws ahead of the rotate detent.
10.
Detent Mechanism (Machines prior to gearless tilt) 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 cam
wi
II be in I ine with the left hand edge of the ribbon
feed cam follower (Fig. 40).
Ribbon Feed And Detent Cam
Edges Even
Ribbon
Feed
Cam Follower
FIGURE 40. Ribbon Feed Cam