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I
NTERPOSER
L
I
NKS
Figure 4-13. Magnet Unit
punch bail three times on each revolution of the punch
camshaft.
The punch camshaft makes 1333
1/
3
revolutions per minute.
The interposer setup bail is a U-shaped channel.
A projection on each of the 80 interposer links rides
in the channel (Figure 4-15). As the
inter
poser setup
bail moves down, all the interposer links move down,
carrying with them the 80 latches. This pulls each
armature against its yoke.
If
punching is to take
place, the magnet is energized at this time. Because
the armature did not have to be attracted electrically,
very low current is required to keep the armature
sealed against its yoke. For this reason, the unit is
sometimes referred to as a "no-work" punch unit.
.
When the interposer setup bail moves up, the
magnet just energized keeps its latch in the down
position. Because the latch is stationary, the upward
movement of the interposer setup bail causes the
interposer link to pivot, extending the interposer be-
tween the punch drive bail and the punch.
The movement of the punch unit camshaft then
causes the punch bail to move down.
Only those
.
columns are punched that have the interposer between
"
the punch drive bail and the punch. When the punch
drive bail pushes the interposer down, the interposer
is clamped between the punch and the punch drive
bail. With this arrangement, the magnet can be de-
energized while the punch is going down rather than
waiting until the completion of the punching operation.
1402 PUNCH
MAGNETS
VIEWED
FROM
HOPPER
-
80 76
72 68 64 60 56 52
48
44
40 36
-
32 28 24 20161284
79 75 71 67 63
59
55
51
47 43 39 35
31
27 23 19 15 11 7 3
78 74 70
66 62 58
54 50
46 42 38
34
30
26
22 18 14
10 6 2
77 73 69 65 61 57 53
49 45
41
37
33 29 25 21
17 13
9 5 1
Figure 4-14. Magnet Position Locating Chart
4-12
As the punch bail returns, the interposer is free
to be restored by spring tension. On the return stroke
of the punch bail, the punch is positively restored by
the punch bail.
Punch Unit Removal
1. Remove the die.
2.
Remove brush block assembly.
3,
Remove both belts from punch unit shaft.
4. Remove four holding screws from top of unit.
5. Disconnect four multi-terminal connectors.
6. Lift punch unit from machine.
Punch Unit Installation
1. With die removed from the machine, place unit
in machine tight against vertical and horizontal ad-
justing screws.
2. Replace four top holding screws.
3.
Connect the multi-terminal connectors.
4. Insert the die.
5. Install the belts.
6. Time punch unit to machine.
7. Time PACB's to punch unit
index.
8.
Check registration and correct as necessary.
Cam Follower Bearing Adjustments
1. Remove punch unit from machine.
2. With punch unitatroomtemperature,adjustso
that a .002" feeler gage, when placed between the
cam follower bearings listed below and their respec-
tive cam surfaces, experiences moderate drag at the
tightest point as the cam shaft is rotated through one
revolution .
a. Punch bail complementary (top-inside) cam
follower bearings
.
b. Setup bail complementary (top-outside)
cam follower bearings.
c. Punch bail active
(bottom-inside) cam
follower bearing.
This adjustment does not apply to the setup bail
active (bottom-outside) cam follower bearings be-
cause the 80 latch springs force these cam follower
bearings to ride tight against their cam surfaces.
3. With the cam follower bearings adjusted to the
.002" feeler gage, check to see that a .005" feeler
gage will not pass freely between any cam follower
bearing and its respective cam surface at any poin
around the cam circumference.
If
this .005" adjust-
ment cannot be
met.
check to see if the punch
m'
a rks
on the eccentric studs are up (these studs can be
interchanged by mistake, in which case the punch
marks would be doWn. making it impossible to adjust
the follower bearings properly) (Figure 4-12).
Cam Follower Assembly Removal
1. Remove punch unit from machine.
2. Remove stripper assembly.
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