IBM Selectric - Operational Magnet Assembly, Late

4.
Magnet Unit Position - Position as follows:
a. Left to Right - so that the armatures are directly
beneath their corresponding interposers (Fig. 170).
Operationa I Interposer
Center li ne For Interposer
And Armature
FI GURE 170. Left To Right
b. Front to Rear - so that the armclture link holes are
slightly to the rear of the interposer link holes
(Fig. 171).
Link Offset
Operationa I Interposer
Operationa I link
~~------~--~~
'Armature
Shock Absorber
FIGURE 171. Front To Rear
Having
the trip link offset insures unlatching of the
interposer since the link pulls downward and also to the
rear.
5. Pull Link (Fig. 172) - Ad'just the operational pull linksso
that a .002
11
to .010
11
clearance exists between the inter-
poser latch bracket and the interposer-latch at the point
of relatching.
Operationa I Armature
Manually Attracted
Operational Magnet
FIGURE 172. Check, Trip link
2-59
NOTE: Test this adjustment by manually attracting the
armature and turning the operational shaft so that the in-
terposer is being restored toward the front.
With all parts at rest (Fig. 173) be sure a clearance exists
between the pull link and the armature.
Interposer Latch Bracket
~0'- '\ >
~~~L-\ _---- Interposer Latch Position
'~f ~- - ~
Armature Against
Backs"
\ /U/'
Operational Armature I:, '
(De-energized) l Oper.
Magnet
FI GURE 173. Trip Link
The pull
link must be approximately 1/2 turn too long
to insure that the armature is moving prior to picking up
the load of the interposer. A trip link adjusted too
short can cause an intermittenf operation or complete
fai lure to release.
OPERATIONAL MAGNET ASSEMBLY (LA TE STYLE)
1 • Pivot Plate (Late Style) All Magnets- Position so that the
armatures (manually attracted) rest on the non-magnetic
shim (Fig. 128.1). This will provide .oor
ll
to .003
11
clearance between the armature and the yoke. Early
production units not incorporating this shim should be
adjusted for .00111 to .003" clearance between the
armature and the yoke.
Armature Manually Attracted
Pivot Plate
FIGURE 173.1 Pivot Plate