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4.6.10 High-Speed CB Assembly Service Check
1. Check for loose pile-up screws.
2. Check for binds in rollers, operating pins, and plungers.
Inspect cam surfaces for irregularities due to wear or
dirt. Wipe cam surfaces clean before adding new lubri-
cant. If an abrasive tool is used in removing burned
spots, check the contact make-and-break timing.
4.6.11 High-Speed CB Assembly Adjustment
1. Remove the CB assembly from the machine. Shim for
0.027-inch to 0.032-inch contact air gap with plunger
seated against the frame (Figure 4-26).
. Form operating strap to require 100 to 150 grams of
pressure, at tip of strap, to close contact.
3. Form cam-follower spring to require 475 to 550 grams
of pressure to close contacts with 0.020-inch to 0.030-
inch overtravel of cam follower.
4. Install CB assembly in machine but do not completely
tighten the holding screw. Turn CB to low dwell and
turn adjusting screw to obtain 0.017-inch to 0.023-inch
contact air gap.
4.6.12 High-Speed Cam Removal
1. Remove print cam if machine hasprint feature.
2. Remove pin from index andslip it off shaft.
3. Unhook knockoff-bail arm and pin drive link springs.
4. Drive taper pins from the two mechanical cam assem-
blies.
5. Loosen setscrewsin all circuit breaker cams.
. Slide shaft toward clutch end until end of shaft clears
rear bearing. It may be necessary to shift clutch magnet
assembly to allow clutch collar to pass clutch magnet
armature. Remove desired cam.
g
| Q - |
Pile-Up Screws |
Add or remove shims
=
cy
SH
|
j
!
!
Form spring
Pressure here
Overtravel should give
475 to 550 grams
0.020" to 0.030"
Figure 4-26. High-Speed Circuit Breaker
4-14
(4/69)
4.6.13 Die and Stripper Service Check
A crayon or pencil deposit sometimes forms on the
underside of the die and can cause drag on the card,
resulting in off-registration punching. These deposits can be
removed with a feeler gage.
A convenient method of lubricating the porous bronze
punch guides is to multipunch several columns of an oiled
blank card.
4.6.14 Die and Stripper Adjustment
Die and stripper clearanceis set at 0.020 inch to 0.026 inch
on machines without print feature. On machines with print
feature, clearance should be 0.012 inch to 0.017 inch.
4.6.15 Die and Stripper Removal and Replacement (With
Print Feature)
|
To remove die andstripper:
1. Remove:
a. Printing head.
b. Chip tube by taking out two screws (Figure 4-27 ). Be
careful not to lose the pressure roll spring.
c. Front rails.
d. Plastic bed plate.
e. Punch extension cover, nuts, and springs.
CAUTION
On reassembly, do not force the nuts tightly against
the shoulder; this can cause the extension to break
off.
f. Horizontal shift spring.
g. Three mounting screws.
2. Pull print interposer assembly from punch extensions.
CAUTION
Keep horizontal shift slide compressed.
3. Remove bottom punch extension guide plate. Lift each
punch extension over punch arm and push it into the
die.
4. Remove the two die mounting screws.
5. With left hand on punch extensions, remove unit from
base.
4.6.16 Die and Stripper Removal and Replacement (With-
out Print Feature)
Removedie and stripper. With punch drive unit in machine:
1. Remove lower punch extension guide. With two or three
2-inch pieces of card between die and stripper, push
punchesinto the die.
2. Remove chip tube by taking out two screws (Figure
4-27). Be careful not to lose the pressure roll spring.
. Lift out release pin from die.
4. Remove front pressure rail covers at punch and read
stations (Figure 4-27).
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