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S225-3357-3
FES: SS23-4069
Rear
Spring
Figure 4-22. Print Drive Unit Cam Timing
Grooves
should
meet
3. Remove the wires from punch clutch magnet and punch
circuit breakers. Remove the slip-connectors from the
interposer magnets.
4. Remove the two screws in pin-sensing bail drive link. On
reassembly, tighten these screws after punch drive unit is
fastened into position with links extended.
5. Remove the two screws from eachsend of drive-unit
anchor bar.
6. Loosen the screws in front mounting plug enough to
permit disengaging the plug. Remove rear mounting plug
screws.
7. Shake drive unit up and down (bed in vertical position)
to free mounting plugs.
8. Turn drive unit clockwise and remove from base.
Before replacing the unit, be sure
all
punch interposers
are resting in the center of the armature slots. It is easier to
re-engage the punch operating arms with the punch
extensions if they are pushed in flush with the lower guide
plate.
4.6.7 Clutch Magnet Adjustment
I
1. Position the core with shims (part 305271) for
0.006-inch to 0.012-inch clearance between armature
and core with armature attracted (Figure 4-23).
2. Attract the armature and pivot magnet assembly around
its support bracket to obtain 0.003-inch to 0.005-inch
unlatching clearance to the step on the sleeve.
Figure 4-23. Punch Clutch Magnet
4.6.8 Punch Clutch Service Check
Sleeve Latching Surface Lead Distance:
1. Trip the armature and check the outer-sleeve lead
distance; it should be 118 inch to 3/16 inch. Punch
clutch lockup is possible if 3116-inch outer-sleeve lead
distance is exceeded.
2. While the clutch is unlatched, turn the drive pulley
forward (do not use the index wheel) until the outer
sleeve hits the armature and the index stops. This should
be 325 degrees +, 10 degrees.
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