IBM Selectric - Page 14

ALIGNMENT
Fine Alignment
1. Tilt Tube End Play - (machines prior to gearless tilt).
2.
Thetilt pulley should be adjusted up or down on the tilt
tube ~o thot .002" tc .00.1" er'l0 ri(lY p')(ic;t in thp. tilt
tube (Fig. 33).
FIGURE 33. Tilt Tube End Play Adjustment
The tilt pulley is attached to the ti It tube by a set screw
and key agai nst a flat surface on the ti It tube. The set
screw is accessible through a hole in the left side of the
carrier. Move the carrier to the right and remove the
tilt pulley spring and tilt detent spring. The tilt detent
spring stud can then be removed through the hole in the
carrier. The hole in the carrier and rocker wi II make
thetiltpulleysetscrewaccessible with a Bristow 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 tilt sector gear and the tilt ring gear. Be sure to
re-install the shim if disassembly is necessary.
Rotate Shaft End Play - Adjust the rotate pulley up or
down on the rotate shaft so that .002" to .004" end play
exists in the rotate shaft relative to the tilt tube (Fig. 34).
L
. 002" to .004"J
. ___ Tilt Tube
i
\
ROTate Pulley
FIGURE 34. Rotate Shaft End Play Adjustment
3.
4.
12
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 loosen-
ing the set screw the grip of the block on the shaft must
be broken by rotating the type heod counterclockwise
manually whi Ie blocking rotation of the 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 careful not to damage the tape or pulley with the
screwdriver. DO NOT rotate the type head clockwise
against the tension of the tape in an effort to break the
pulley loose . Tape breakage or other parts damage may
result.
NOTE: The heightofthe lower ball socket is controlled
by a shim located between the lower ball socket and the
tilt tube. The height relative to the tilt ring must be
controlled in order to insure proper operation of the ball
joint. If disassembly of the rocker is ever necessary,
the shim must be reinstalled.
Tilt Ring - Theupperball socket should be centered over
the lower ball socket within .002". It is adjusted by
moving
the tilt ring left or right after loosening the tilt
ring pivot pin set screws. All side play of the tilt ring
should be removed by the Pivot pins whi Ie sti II allowing
the ti It ring to pivot freel y.
If the tilt ring is not properly centered, the rotate posi-
tionofthe 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.
Thetiltringcaneasily be removed if the machine is half
cycled to a two ti It 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 ti It ring is installed. The rear tooth cf the tube sector
gear should enter the second notch of the ti It ring sector
gear (Fi g. 35) .
CAUTION: Side play in the tilt ring can cause poor
horizontal and vertical alignment. It can also affect
impression.
Upper Ball Socket - The upper ball socket must rotate
completely free of binds with little or no up and down
play. The ad justment is made by raising or lowering the
tilt ring spacer by installing thicker or thinner shims at
the front and rear (Fig. 35).
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