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TIMING DRIVE BELTS
PUNCH FEED INSTALLATION PROCEDURES
Because of the large number of timed drive belts in
the punch feed, special attention will be given to the
replacement and retiming procedures to be per-
formed.
An important point to remember when
retiming units that refer to the punch clutch is the
::ih:~U~ t~~:, (~!::~w~!e~~l~!~l~~lhbe ;~~
180 ,270 from timing specifications. All machines
after serial number 20600 will use one particular
tooth as the synchronous tooth.
This will be the
tooth with its driving face opposite the centerline of
one of the three tapped holes located in the outside
collar.
On earlier machines, gage number 608183
must be used. Figure 5-1 will give a brief outline of
the units to be removed and units to be retimed in
the event of belt breakage.
(1) Main Drive Belt
1. Trip clutch between 230
0
and 300
0
and turn
input idler pulley manually until dog engages in clutch
ratchet.
2. While holding armature in tripped position,
continue turning machine until latching surfaces of
clutch latch arm and dog carrier coincide (Figure
4-2F).
3. At this time punch feed index should be 315
0
±
1/2
0 •
4. Set timer index at 315
0 •
5. At this point, Slip belt on geneva pulley aDd
while keeping the relationship between lower pulley
and input idler pulley (315
0
at the clutch and 315
0
at
the timer) slip belt onto two pulleys. Check timing
relationship again.
6. To time the geneva, loosen geneva pulley lock
scr~ws,
set timer index to 0
0 ,
and set punch index
to 0 .
7. Depress geneva lock pin and tighten geneva
pulley lock screws.
o
NOTE: At 315 ,if everything is in time, the geneva
pin should fall into the slot and the punch clutch will
line up as described in step 2.
(2) Drive Motor Belt
1. Mark CR idler belt (3) and pulleys to maintain
timing.
2. Loosen CR idler belt (3) and slip it ofi.
3. Install drive motor belt and tighten.
4. Install CR idler belt (3), line up reference
marks, and tighten with idler pulley.
(3) CR Idler Belt
1. If there is sufficient clearance to work the belt
between the index pulley and the cross-over shaft
pulley, the index timer unit does not have to be re-
moved from the base.
Otherwise, the three base
mounting screws on the timer index will have to be
loosened.
2. Install new belt, tighten idler pulley, and if
necessary, tighten timer index unit (three screws).
3. Retime index timer by loosening timer index
set screws (Figure 5-2).
Unlatch punch clutch be-
o
0
tween 230 and 300 and while holding the armature
in the tripped position, continue turning machine until
latching surface of clutch arm and dog carrier coin-
cide (Figure 4-2F).
0
4. At this time, set timer index to 315
and
tighten timer adjustment set screws.
5. To retime PCCB's, loosen PCCB pulley set
screws.
Set timer index to make time of PCCB 4
(wiring diagram). Turn PCCB unitin normal direc-
tion of rotation until PCCB 4 makes and then tighten
PCCB pulley set screws.
(4) Timer Index Belt
1. To get belt replacement clearance (if nec-
essary) loosen timer index mounting screws (3).
2. Install belt.
If base screws were removed,
tighten by pulling timer unit to left. Tighten mounting
screws.
3. To time timer index, loosen index pulley set
screw (Figure 5-2). Set punch unit to 0
0
and depress
gen:~ ~~index
to 0
0
and tighten pulley setscrew.
(5) PCCB Drive Belt
1. Install new belt. If belt is too tight or loose,
loosen PCCB unit mounting bolts and adjust belt. .
2. Loosen PCCB adjusting set screws on'drive
pulley.
3. Set timer index to make time of PCCB 4
(wiring diagram) and turn PCCB unit in the machine
operating direction until PCCB 4 makes. then tighten
set screws.
(6) Idler Belt
1. Remove PCCB drive belt (5) and transport
drive belt.
2. Install new belt and tighten with idler pulley.
3. Replace transport drive belt (no timing re-
quired) and PCCB drive belt.
5-1
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