Escapement Mechanism - IBM Selectric I/O Reference Manual

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wiii siightly affect the adjustment at the other end. Be
sure to recheck each adjustment.
Anvil
Frame
Power ________________
~
Frame
Anvil
Locking
Screws
FIGURE
96.
Carrier Buffers
(15
Inch Machines)
8.
Carrier Buffers - A buffer plate attached to the right side
of the carrier and an adjusting screw under the left side
strike the top of the anvil to prevent the print shaft from
flexing downward. Each should have. 002
11
to .004
11
clearance wi th the top of the anvil (Fi g.
96).
9.
Print Cam Follower
a.
Print Cam Follower Stud - Adjust the pivot stud
left or right so that the rubber roller on the follow-
er is centered on the surface of the restoring cam.
The stud is held in place in the carrier by a set
screw that is accessible from the bottom of the ma-
chine.
b.
Restoring Cam Follower Eccentric - With the print
cam follower at the high point of the cam and the
platen removed, hold the typehead toward the rear
until it is restricted by the anvil and striker. The
rubber roller should just touch the restoring cam
(Fig. 97). Adjust the eccentric, keeping the high
point forward, to satisfy the condition.
NOTE:
If the roller is too close to the restoring
cam, it may bind against the cam during print shaft
rotation. If too much clearance exists, the type-
head may not be restored as quickly as it should and
blurred characters may result.
10. Even Printing - Position the yoke under its mounting
screws so that the density of the ieft and right sides of a
printer character will be uniform"
Restore Cam
2-31
Stdker Against Anvil
FIGURE 97.
Restoring Cam Follower Eccentric
Adjustment
CAUTION:
This adjustment affects the tilt ring homing
adjustment, the typehead homing adjustment, and the
detent cam and actuating lever adjustments (skirt clear-
ance). Be sure to check these after changing the posi-
Hon of the yoke.
ESCAPEMENT MECHANISM
1.
Escapement Bracket -
a.
With the carrier to the left
I
adjust the escapement
bracket front to rear so that .00111 to .00211 exists
between the raised area of the escapement bracket
and the tab torque bar. The rear surface of the es-
capement bracket should be kept parallel with the
tab torque bar (Fig.
98).
Early printers which do not have a raised area should
be adjusted for
.01111
to
.017"
between the escape-
ment bracket and tab torque bar.
o
Escapement Bracket
Positioned to Obtain
Clearance
o
~r---------~
0
. Check Entire Length of Writing
.00111 -
.00211
I )
Line For Possible Warped
lQJ
Torque Bar
FIGURE 98.
Escapement Bracket
b.
With the carrier to the right
I
form the extension on
the tab rack plate so that. 001
11
to .002
11
exists
be-
tween the raised area of the escapement bracket and
the tab torque bar. This is the extension which sup-
ports the tab torque bar on the right side (Fig. 99).
Note:
This part is case hardened on early machines.
Use caution when forming. Adjustment
"a"
should
be rechecked if this extension is formed.

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