Timing Belt Adjustments; Punch Feed Clutch - IBM 1402 Reference Manual

9. Replace locating pins; tighten mounting screws.
10. At 315
0
on index, with geneva pin detented, align
mark on punch drive gear with mark on input
idler pulley. Also align marks on main drive belt
with marks on input idler pulley, geneva and main
input pulley. Clutch should latch at this time.
11. Retime first stepped feed roll. Refer to Feed Roll
and Aligner Stations, First Stepped Feed Roll.
NOTE:
When this procedure has been per-
formed, feed mechanism should be in time.
OTHER DRIVE BELT REPLACEMENTS
The remaining drive belts in transport unit are easily
replaced and require no timing after replacement.
Timing Belt Adjustments
Refer to Figure 3-19. Belt, pulley, bearing, and shaft
life can be increased with proper belt tension. The
one pound (450 grams) pressure indicated in Figure
3-19 is measured by using a gram gage (450459) and
X10 blade.
When using gram gage to measure belt tension,
pointer must be as near as possible to midpoint of belt
width. Readings made at belt edge are inaccurate.
Some belts are not included because they are inacces-
sible to a gram gage. Proper tension on these belts can
be obtained by comparison to belts of similar span
and width.
Punch Feed Clutch
ADJUSTMENTS
The clutch assembly is pinned at the factory, and
should not be changed. Step 1 would only be per-
formed if a new clutch assembly is installed.
1. Set clutch so latch arm is on horizontal centerline
of picker camsha£twithin .005" (Figure 3-20).
a. Position unit sideways so keeper is flush with
edge of dog carrier within .010" (FigJte 3-22).
b. Form cam follower arm so cam follower is on
middle of cam surface.
2. Turn machine to low dwell on clutch cam. Trip
clutch; set adjusting screw for .018" to .030" un-
latching clearance (Figure 3-21 A). "
3. Crank machine to high dwell on clutch cam.
Check for a minimum of 1/16" overlap of clutch
latch arm on dog and dog carrier (Figure 3-21 B).
a. Reposition latch arm if necessary (check item
2).
4. Check for .003" to .005" clearance between dog
catrier and keeper. Peen or stone the keeper to
adjust it (Figure 3-21 B).
5. With cam follower on high dwell, position arma-
ture backstop plate, vertically, for .020" to .025"
3-14
overlap of armature and latch; position horizon-
tally for .010" to .015" relatching clearance (FIg-
ure 3-21 C).
6. Adjust magnet' assembly for .010" clearance be-
tween armature and core nearest pivot, and .025'·
between the armature and core farthest from the
pivot,.when armature is latched (Figure 3-21D).
'Lhis adjustment should give .003" to .005" clear-
;.,."lItnce between armature and core nearest pivot
~~;
". when armature is attracted.
7. The clutch should unlatch with an .008" gage
inserted between armature and core farthest from
pivot point. It should not unlatch with a .010"
gage inserted. Readjust overlap, if necessary (Step
5).
8. With cam follower on high dwell, set armature
knockoff for .010" to .012" clearance between
armature and knockoff (Figure 3-21E).
9. This adjustment is only for IQachines with a clutch
tooth selector arm (Figure 3-20).
With the clutch tripped in the sync tooth and the
clutch trip lever held down, adjust the clutch
tooth selector arm for .010"-.030" clearance to
the center of the low dwell of the selector cam.
Make sure that clutch trips. Re-adjust within tol-
erance if necessary.
TIMING
This adjustment ensures that punch feed index is in
time with punch clutch dog engaging time.
1. Trip clutch between 230
0
and 300
0
;
crank machine
manually until dog engages in clutch ratchet that
lines up with set screw in outside collar.
2. While holding armature in tripped position, con-
tinue turning machine until latching surfaces of
clutch latch arm and dog carrier coincide (Figure
3-21F).
3. Punch feed index should be at 315
0
±
W.
a. If punch feed index is not at 315
0
,
loosen
. clamping hub of index drive pulley and turn
index to 315
0
•
b. Tighten clamping hub.
NOTE:
If any change is made in clutch tim-
ing, check
ti~ing
of all other punch feed units.
MAGNET BRACKET ASSEMBLY REMOVAL
1. Remove locating pins in punch clutch magnet
bracket· assembly.
NOTE:
Lower left pin is removed with puller;
upper right pin is removed (from rear of ma-
chine) with a punch.
2. Remove mounting screws and lift out assembly.
3. Replace in reverse order. Be sure to. set locating
pins before tightening mounting scre;;;.