DE-STA-CO S/SM300A - Manual (Page 20)

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SECTION 5: Adjustments (continued)
5.3.1. Clutch Adjustment Description
The clutch must be adjusted to prevent any slippage during normal operation to
prevent shock loading. It should also not be adjusted so tight as to be able to
damage the indexer during a jam or overload. However, it is best to err on the side
of being tighter than required. The proper setting for the clutch is determined by
gradually tightening the clutch adjusting nut until the clutch no longer slips in either
direction during a complete, fully loaded index cycle at normal speed.
5.3.2. Shut-off Spool Use & Adjustment
The shut-off spool (number 8, Figure 9) is attached to body and cone (number 3,
Figure 8) by means of shallow round threads in body and cone (number 3, Figure 8)
and a ball plunger (number 9, Figure 8) in spool (number 8, Figure 8). When the
clutch is operating normally (i.e. not slipping), there is no relative movement
between spool (number 8, Figure 8) and main body (number 3, Figure 8) and the
remainder of the clutch, including the spool (number 8, Figure 8) driven by pin
(number 7, Figure 8). This relative rotation causes the spool to move along the
screw threads on the body (number 3, Figure 8). The spool will move to the left or
to the right, depending on the rotation of the clutch. This lateral movement of the
spool is intended to activate a limit switch arm located in the center groove in the
spool. The "tripped" limit switch should be electrically connected to the controls to
stop the operation of the motor driving the indexer.
5.3.3. Resetting Procedure
To recover from a jam or overload in which the clutch has slipped sufficiently to
displace the shut-off spool:
Manually disconnect the power to the drive motor to prevent an accidental start-up
(use O.S.H.A. approved lockout procedures), clear the cause for the overload.
Then simply push or pull the spool (number 8, Figure 8) on the main body
(number 3, Figure 8) to the thread engagement closest to the center position on
the threaded portion of the body (number 3, Figure 8). Check the limit switch
circuitry for proper operating conditions. The indexer can now be powered up and
production resumed.