Interposer Bail Contact Assembly Adjustment; Punch Drive Removal And Replacement - IBM 29 Card Punch Field Engineering Maintenance Manual

0.008" minimum unlatching
clearance except space
interposer Mili. ;
S30 0
345°
Figure 4-19. Armature Unlatching Clearance
4.6.5 Interposer Bail Contact Assembly Adjustment
Bail-contact assemblies may be removed after removing the
master bed plate or punchdrive unit.
1. Both contact assemblies must have equal tension. Form
stationary contact strap to require 30 to 35 grams to
raise it off its support. Forming should be within the
area of the supportstrap to reflect a true condition. One
method of forming the contact strap is to insert a
straightened paper clip between the strap and its
support. Form contact strap to obtain a point-to-point
contact at outer tip of support strap. When strap is
properly adjusted, a crack of light will appear at tip of
support strap during measurement.
2. With contact assemblies removed, form operating strap
near the mounting to require 20 to 25 grams to close
contacts (Figure 4-20). Place gram gage finger under
phenolic pad with 1/4-inch overlap when checking
adjustment; 50 to 60 grams should then be required to
close contact and to raise stationary contact off support
strap (Figure 4-21).
3. Reinstall the contact assemblies and adjust their mount-
ing brackets for 0.017-inch contact gap with all arma-
tures restored.
1/4" Oo = wage
[|g
to make contact
Figure 4-20. Interposer Bail Contact Adjustment
Crack of light
a 1/4" Overlap
Figure 4-21. Interposer Bail Contact Rise Adjustment
4.
4.
I.
6.6 Punch Drive Removal and Replacement
6.6.1 With Print Feature
Remove:
a. Belt guard and punchdrive belt.
b. Auxiliary duplicating feature (if installed).
c. Wires to punchdrive unit.
d. Twoscrewsin pin-sensing bail drive link.
e. Flexible shaft (if installed).
. Unhookprint drive spring (Figure 4-22) and trip punch
clutch armature to prevent damage to it. Hold index and
remove screw with left-hand threads from end of punch
shaft. Unscrew grease fitting from mounting plug.
Note: The next step requires realigning the code plate when
reassembling. Refer to 4.11.2.3.
3.
7.
8.
Loosen knurled thumb screw or removeslotted clip on
vertical drive rod to relieve tension and removevertical
drive rod guide plate. Disengage the print rod from the
print arm (Figure 4-22) by applying slight pressure on
drive rod at lower end.
. Lift print drive mechanism from rear mountingplug.
. Remove two screws from each end of drive-unit anchor
bar.
. Loosen screws in front mounting plug enough to permit
disengaging the plug. Remove rear mounting plug screws.
Shake drive unit up and down (bed in vertical position)
to free mounting plugs.
Turn drive unit clockwise and remove from base.
Before reinstalling drive unit, manually push punch
extensions in as far as possible. Reverse procedureto install
punch unit. Align groove in eccentric bearing to mark on
print cam (Figure 4-22). Check printing.
4.6.6.2. Without Print Feature
1 . Remove belt guard and punch drive belt.
2. Loosen setscrew in reduction housing gear hub andpull
out flexible drive shaft. Use unused position of cable
clamp to hold cable out of the way.
29FEMM (4/69) 4-11