IBM Selectric Maintenance Manual page 36

FIGURE
47.
Ti It Tube End Play Adjustment
carrier. The hole in the carrierandrockerwill make the
tilt pulley set screw accessible with a fluted wrench.
NOTE: The height of the tilt sector gear is established
by shimming between the gear and the top of the yoke.
The height is set to obtain the proper backlash between
the ti It sector gear and the ti It ring gear.
Be
sure to
re-install the shim if disassembly is necessary.
2.
Rotate Shaft End Play - Adjust the rotate pu lIey up or
down on the rotate shaft so that
.002"
to
.004"
end play
exists in the rotate shaft relative to the tilt tube or yoke
(Fig.
48).
L
"+
• 002"
to
.004"
Wedging
Block
FIGURE 48A.
Gear Type Tilt
FIGURE 48B.
Gearless Ti It
The rotate pulley is secured to the rotate shaft by a
wedging block and a set screw. The pulley set screw is
accessible from below with the carrier centered over the
cycle shaft and the shift in the upper case. After loos-
ening the set screw, the grip of the block on the shaft
must be broken by rotating the typehead counterclock-
wise manually while blocking rotation of tf-e pulley.
This can be done by inserting the
3"
screwdriver at the
rear between the notch in the pulley and the tape guide
block. Be carefu I not to damage the tape or pu Iley with
the screwdriver. DO NOT rotate the typehead clock-
wise against the tension of the tape in an effort to break
the pulley loose. Tape breakage or other parts damage
may result.
NOTE: The height of the lower ball socket is con-
trolled by a shim located between the lower ball socket
and the tilt tube or yoke. The height relative to the
tilt ring must be controlled in order to insure proper op-
eration of the ball joint. If disassembly of the rocker is
ever necessary, the shim must be reinstalled.
2-13
3. Tilt Ring - The upper ball socket should be centered over
the lower ball socket within
.002".
It is adjusted by
moving thetilt ring left or right after loosening the tilt
ring pivot set screws. All side play of the tilt ring
should be removed by the pivot pins while still allowing
the ti It ring tv pivot freely.
If the ti It ring is not properly centered, the rotate posi-
tion of the head can vary slightly as the head is tilted
to the different tilt positions. This could constitute a
portion of the band width in the rotate system.
The ti It ring is centered at the factory and every effort
should be made to maintain its centered position. If tilt
ring removal or replacement is necessary, a feeler gauge
should be inserted between the tilt ring and the yoke to
determine the clearance before the tilt ring is removed.
The tilt ring should be replaced to the same clearance.
The tilt ring can easily be removed if the machine is·half
cycled to a two tilt position. On machines prior to the
gearless tilt mechanism, care should be taken to insure
that the ti It sector gears are properly meshed whenever
the tilt ring is installed. The rear tooth of the tube
sector gear shou Id enter the second notch of the ti It ring
sector gear (Fig. 49).
CAUTION: Side play in the tilt ring can 9duse poor
horizontal and vertical alignment. It can 61so affect
impression •
4.
Upper Ball Socket - The upper ball socket must rotate
completely free of binds with little or no up and down
play. The adjustment is made by raising or lowering the
tilt ring spacer by installing thicker or thinner
shi~s
at
the front and rear (Fig. 49).
In order to check the upper ball socket for binds it is
necessary to remove the ball joint so that the upper ball
socket can be rotated by hand. This can be done either
by removing the tilt ring and upper ball socket together
and checking them off the machine or by removing the
upper ball socket and replacing it without the ball joint.
If the tilt ring is removed, its position relative to the
yoke must be checked by a thickness gauge before re-
moval.
NOTE: If the upper ball socket, tilt ring, or tilt ring
spacer are ever replaced by new parts, the shimming
adjustment must be checked.
Minimum Play in
Upper
Be
II Socket
Ti It Ri ng
C:"",. ..
,r _ _
-C
Tube G
FIGURE 49.
Shim
Rear Tooth of Tube Gear
Enters Second Notch of
Tilt Ring
Upper
Be
II Socket Adj ustment