Magdet Bar Assembly - IBM 1402 Reference Manual

Magnet Bar Assembly
REMOVAL
l. Remove magnet bar assemblies 2, 3, and 4
( counting from top to bottom). See Figure 3-35.
Caution: Do not remove top bar with other three
bars removed.
2. After inspection, replace bar assembly 4, and
then 3. The four magnet bar assemblies should be
installed tight against upper edge of mounting
slots. Bar assemblies go in easier with latches in
lowest position. Center magnet bar assembly so
that nylon armature guide comb does not inter-
fere with ears on latches.
3. Remove magnet bar assembly l.
4. Replace magnet bar assembly 2, and then l.
SERVICE CHECKS
l. Remove bar assembly and check armatures for
• 004"
to
.013"
OVERTHROW
wear and for loose springs or rivets. Also check
that armatures do not strike core.
2. Check between armatures and yokes for dirt and
excess grease.
3. Make sure latches and latch guides do not bind.
ADJUSTMENT
l. Remove punch unit from machine.
2. Remove punch magnet unit from punch unit, if
necessary.
3. Remove magnet bar assemblies from magnet unit.
a. Provide .002" to .004" clearance between arm-
atures and cores. See Figure 3-34.
b. Check armature-to-pivot rod clearance. Set
clearance between perceptible mmunum
movement to a maximum of .008" with oper-
ating end of armature held against yoke. See
Figure 3-34 .
.005"
to
.010"
• 005"
to •
013" -r-+II:::!::==-l
.001"
to
.008"
LATCH
.002"
to
.004"
ARMATURE - - - - ' " \
ARMATURE
---1:~ffl~~!jffi
PIVOT ROD
YOKE----I!-\
.003"
.006"
INTERPOSER GUIDE BAR
PUNCH DRIVE BAIL
>~:=:z::;?-\---
PUNCH BAI L
INTERPOSER-----+---~~
INSERT .007"
GUIDE BAR
~~~~~;r~~==~~~~~~--=::~----
CLAMPING SCREW
k
FEELER GAGE
INTERPOSER GUIDE BAR
ADJUSTING SCREW
Figure 3-34. Punch Unit Adjustments
PUNCH RETAINER
PLATE
PUNCH RESTORING BAIL
3-29