IBM 29 Card Punch Field Engineering Maintenance Manual page 60

4.11.1.5 Printing Interposers
Figure 4-41 shows the location of the print interposers,
rollers, and slides. Each unit of cam action equals 0.020-
inch motion to its slide. A —1 cam has a 0.010-inch cut
from both sides of the interposer, resulting in a 0.020-inch
motion. A +4 interposer moves the slide 0.080 inch. Use
Figure 4-41 as a guide to reassemble the print interposer
assembly. The + or — values are etched on the interposer
faces. (The ratio of motion ofthe slides to the code plateis
10 to 11.)
Vertical Slide Roller Locking Screw Hole
Inside View
3-2 -l +4 a\
Slide
ololon
[KXXy
CC NE A
RA Cy OO TOTENFD
O
Interposer ~~ 12 11 0 8 9 Fixed
| i293 4°55 6 79 Stops
1 OO Co) Oo
L_ | YT
1 EXO CL
Horizontal Slide
(Outer View) -} 42 «1 -2 43 44 -3 -|
Figure 4-41. Print Interposer Assembly
4.11.2 Print Assembly Adjustments
Adjustment of one component unit often affects another
unit. Units should be adjusted in the order in which they
appearin the following text.
4.11.2.1 Punch Drive and Print Yoke
Clearance between the yokes and guides should be 0.015
inch to 0.020 inch (Figure 4-42); it is obtained by adjusting
the punch drive unit. This clearance causes rollers to
contact print interposers a minimum of 0.015 inch above
the start of cam action. Because the clearance cannot be
measured, it is obtained as follows:
1. Oil (IBM # 6) the print interposers.
2. Remove belt guard and punch drive belt to remove
tension on drive unit.
3. Loosen the two screwsin the pin bail drivelink.
4. Loosen the adjusting screw lock nut, holding screw, and
two support screws in the drive anchor bar (Figure
4-29). Unhookthe print drive spring.
5. Rotate the drive unit counterclockwise with the punch
clutch latched until yokes can be felt to bottom on their
inner guides. Turn the adjusting screw in until it touches
the casting; back off 5/6 turn maximum andtighten the
lock nut and holding screw. The two support screws
should be turned in until they rest against side frames.
6. Reassemble the machine and test punch penetration
with standard codes.
Punch Extension
Guide Plate
i Fixed Stop
Locking Screw
0.015" to 0.020" / )
Clearance Yoke A 7
to Interposer
Guide Plate
Print -
Interposer
Rear View Side View
Figure 4-42, Punch Drive and Yoke Adjustment
Note: Extend and tighten the pin bail drive link during
reassembly.
4.11.2.2 Code Plate Clearance
1. Start with one 0.003-inch shim (part 305243) and two
0.007-inch shims (part 228296) between the pressure
plate and the shim retaining plate (Figure 4-43).
Note: No oil or grease should be on the codeplate or
shim retaining plate because shifting troubles occur.
2. Turn the three large pressure plate adjusting nuts
counterclockwise until snug (Figure 4-43). Lock them in
this position.
3. Check for code plate clearance to wires of 0.028 inch to
0.030 inch. Add or remove code plate shimsif necessary.
4.11.2.3 Code Plate Alignment (Figures 4-44 through 4-47)
CAUTION
Failure to loosen locking screws during alignment may
result in sheared adjustment screws.
1. Code plate is aligned with the punch clutch latched up.
Loosen screws on the vertical drive rod guide plate
(Figure 4-45).
2. Loosen stop-adjustment locking screws and back off
horizontal and vertical stop-adjusting screws (Figure
4-44),
3. Unhook horizontal shift spring. Take tension off vertical
shift spring by backing off knurled thumbscrew (Figure
4-45). Tighten the locking nut.
4. Insert code plate aligning tools.
5. Position both vertical drive studs within the code plate
slots and tighten the locking screws of the vertical drive
rod guide plate (Figure 4-45).
29FEMM (4/69) 4-29