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Print Drive
cen
Rod
Cees
See
ae
Suppression Arm
Eccentric Screw
" 4
Rear
Mounting
Plug
Armature Stop
Grease Fitting
Idler Arm
Left-Hand Thread
Print Arm
Roller
Print Drive
Spring
Figure 4-22. Print Drive Unit Cam Timing
. Remove the wires from punch clutch magnet and punch
circuit breakers. Remove the slip-connectors from the
interposer magnets.
. Remove the two screwsin pin-sensing bail drive link. On
reassembly, tighten these screws after punch drive unitis
fastened into position with links extended.
. Remove the two screws from each end of drive-unit
anchorbar.
. Loosen the screws in front mounting plug enough to
permit disengaging the plug. Remove rear mounting plug
SCTEWS.
. Shake drive unit up and down (bedin vertical position)
to free mounting plugs.
. Turn drive unit clockwise and remove from base.
Before replacing the unit, be sure all punch interposers
are resting in the center of the armatureslots. 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
l. Position the armature stop assembly for 0.006-inch to
0.012-inch clearance between armature and core with
armature attracted (Figure 4-23).
. 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 thesleeve.
4-12
(4/69)
TW Bearing
'Print
sy
Cam
Eccentric
Grooves should meet
0.003" to 0.005"
Clearance
0.006" to 0.012"
Clearance
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 1/8 inch to 3/16 inch. Punch
clutch lockup is possible if 3/16-inch outer-sleeve lead
distance is exceeded.
. 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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