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A D J U S T M E N T S
27
Clutch
Figure 32. Clutch Adjustment
GENEVA MECHANISM
Single Revolution Timing Cam
This cam should be timed so that the flat side
of the cam is up and in a horizontal position at
one ,tooth past 14 on the index.
Move the cam
and gear out on the shaft far enough to unmesh
the teeth and remesh for above condition (Figure
33).
The geneva pawl should be engaged when
checking this adjustment.
Single Revolution Timing Cam Bracket
Loosen the holding screw.
Move the bracket
up or down until the cam holds the geneva pawl
Single Revolution
Timing Cam
/
~eneva Pawl
Figure 33. Single Revolution Timing C a m and Bracket
Adjustment
disengaging roller in position to hold the geneva
pawl away f r m i the one-tooth ratchet on the gen-
eva gear when the punch clutch is latched up at
D
and the machine is operated by hand. Only the
raised portion of the tail of the pawl should operate
against the roller.
Set bracket so that geneva clutch pawl just nips
the one-tooth ratchet. Then move the left end of
the bracket up until the pawl just clears the one-
tooth ratchet.
An approximate adjustment may be obtained by
setting the bracket so that the locking screw is
about one-third of rhe way up from the bottom of
the elongated hole (Figure 3 3 )
.
Geneva Clutch
A two-pawl geneva clutch is used with the 603
punch unit. This assembly is more positive in its
action than the single-pawl type, and is inter-
changeable with the geneva clutch assembly on
all high-speed punches.
Two pawls, one a driving pawl and the other a
detenting pawl, are used to eliminate the critical
knockout timing of the clutch. The pawl disen-
gaging roller is not adjustable because it is pinned
to the bracket.
PUNCH UNIT
Belt Tension
The belt tension is adjustable by moving the
motor up or down on its pedestal. The belt should
be adjusted for enough tension t o prevent slippage;
excessive tension, however, will cause the motor
bearings to overheat and should be avoided.
Feed Roll Tension
Feed roll tension is determined by compression
springs in the feed roll pressure bracket.
If for
any reason any pressure spring in any one bracket
is replaced, all springs in the bracket should be re-
placed to provide for even tension. The pressure
bracket is equipped with holes tapped for 5-40
screws which may be used to lock the pressure shoe
under spring tension before removing the bracket.
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