DE-STA-CO 722 INTERMITTOR - Manual (Page 14)

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SECTION 5: Adjustments (continued)
5.1.1. 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.
5.1.2. Shut-off Spool Use & Adjustment
The shut-off spool (number 8, Figure 4) is attached to body (number 3, Figure 4)
by means of shallow round threads in body (number 3, Figure 4) and a ball
plunger (number 9, Figure 4) in spool (number 8, Figure 4). When the clutch is
operating normally (i.e. not slipping), there is no relative movement between spool
(number 8, Figure 4) and main body (number 3, Figure 4) and the remainder of the
clutch, including the spool (number 8, Figure 4) driven by pin (number 7, Figure 4).
This relative rotation causes the spool to move along the screw threads on the
body (number 3, Figure 4). 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.
5.1.3. 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 4) on the main body
(number 3, Figure 4) to the thread engagement which is closest to the center
position on the threaded portion of the body (number 3, Figure 4). Check the limit
switch circuitry for proper operating conditions. The indexer can now be powered
up and production resumed.