Wexxar WF-10T, Operation And Service Manual

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WF-10T Case Former Machine Maintenance
9-88
9.7
Case Drivebelt System Troubleshooting
The
Uni-Drive
side-belt system is designed to keep the case square during sealing, which results
in a technically stronger seal and a better finished appearance. This is achieved by linking the
drives on the side-belts to a single motor and reduction gear, which inherently synchronize belt
speeds. In the Uni-Drive system, both belts are linked by single continuous loop of machine
chain, and are driven via a simple self-compensating serpentine system running over four
sprockets.
9.7.1 Case Not Sealing Squarely
Despite the parallel drive nature of the Uni-Drive system, the cases exit the machine out-of-
square after sealing.
Verify that:
•
the case is square prior to engagement in the conveyor side-belts.
•
neither of the conveyor belts is slipping on its drive pulley. See the belt tensioning
procedure under Section 8.2: ‘
Service and Maintenance Procedures’.
•
the side-belts are correctly adjusted to the case width by the following method:
1. Adjust the belts inward until they lightly contact the case sides. The case
should still be able to slide through the side-belts if pushed firmly.
2. Remove the case and adjust the belts inward by another half-turn.
9.7.2 Crushed Band on Bottom of Case’s Side Panels
If the cases exit the machine with a band of crushed corrugation at the level of the conveyor belts,
it is likely that the cases have been gripped too tightly by the belts.
9.7.3 Belt Sheds Rubber ‘Dust’
A belt-colored dust appears beneath the conveyor belts, particularly at the discharge end of the
machine.
Verify that:
•
the case is clearing the belts as it exits the machine, and that outfeed conditions do
not cause cases to back-up into the machine.
•
belt tensioning and tracking adjustments are correct as described in Section 8.2:
‘
Service and Maintenance Procedures’
.
Incorrect settings can cause premature belt wear and possible belt breakage.
9.7.4 Conveyor Drive Rattles Audibly
Although pre-stretched chain is used in the machine drive, over time the chain may loosen and
rattle on the drive cover. Tighten the idler sprocket as described in Section 8.2: ‘
Service and
Maintenance Procedures
’.