Card Feed Latch Magnet Adjustments; Hopper-To-Prepunch Bed Service Checks - IBM 29 CARD PUNCH Maintenance Manual

S225-3357-3
FES: SS234069
Yoke Adiustina Screws
Armature
Spring
/ \
0.032" to 0.036"
A
I
Support
100 to 120
Grams
Figure 4-4. CF Clutch Magnet Adjustment
Magnet Unit
Mounting
Screws
,
Clutch Latch
Disk
\
-
-
-
d H
Figure 4-5. CF Clutch Adjustment
4. Adjust the two jam nuts on the stacker end of the CF
shaft for 0.003-inch to 0.01 1-inch endplay.
5. When previous adjustments are correct, clearance be-
tween ratchet and latched dog will be at least 0.005
inch. If clutch nipping or clutch chatter persists, recheck
spring tension as in item 2, then check timing of card
stop cam shaft. (See 4.5.9).
Note: When the cam follower is rising on the cam after
latchup, the cam shaft and card feed shaft are pushed
backward which allows the clutch dog to drop against the
ratchet.
4.5.3 Card Feed Latch Magnet Adjustments
4.5.3.1 Yoke and Armature
1. With contacts aligned against contact supports, turn
armature backstop screw until stationary contacts rise
Figure 4-6. CF Latch Magnet Adjustment
1132-inch off their supports (Figure 4-6).
2. Position magnet yoke so that lower arm of yoke strikes
armature with a 0.010-inch gage between armature and
magnet core. Tighten screws.
3. Turn backstop screw two full turns counterclockwise
and lock.
I
Note: Check feed knife adjustment after adjusting latch
magnet.
4.5.3.2 Mounting Plate Assembly
1. Provide 3164-inch (0.047-inch) clearance from latch
magnet armature to ear on CF cam follower arm (Figure
46).
2. At same time, position assembly vertically to provide
0.005-inch to 0.017-inch latching clearance from cam
follower arm to armature tip when armature is attracted.
4.5.4 Hopper-to-Prepunch Bed Service Checks
4.5.4.1 Card Feed Pressure Roll Service Check
Check for even drag on a card inserted lengthwise down
either side. Rollers should be free of binds, and the two flat
springs should be straight when removed from machine.
Misalignment or uneven tension on pressure roll bar may
cause uneven feeding of cards.
4.5.4.2 Aligner Finger Service Check
Factory adjustment for the card aligner fingers is 0.035-
inch to 0.055-inch movement ahead of top card rail. The
card must snap off the card aligner fingers and drop into
position along the top rail before registration. Otherwise,
the first 15 columns may be in-registration and the rest of
the card may be off-registration to the left.
29 FEMM (11170) 4-5