Wexxar WF-10T, Operation And Service Manual

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WF-10T Case Former Machine Maintenance
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8.5
Maintenance Adjustments
8.5.1 Mechanism Speeds
Machine mechanism speeds are not intended to be altered.
The PLC restricts the speed of
the machine to exactly 10 cases per minute (CPM) and recalculates the machine’s throughput
once every two cases.
However, if pneumatic adjustments are necessary over time, adjustable
f
low control valves are
fitted on the valve bank. These controls are not meant to be adjusted except under the
instruction of the Wexxar/BEL Service Department. Before making adjustments to the flow
controls, refer to the ‘Pneumatic Control Circuit’ diagram in the Supplementary Manual. Note that
a cylinder’s exhaust air is restricted in order to reduce the speed of the cylinder’s motion. For
example, if the Black air-line is pressurized and causes the cylinder to extend, then the flow
control of the Red port determines the speed.
8.5.2 Shock Absorbers
Hydraulic and pneumatic shock absorbers are used in various locations on the machine to control
impact forces caused by inertial effects.
Hydraulic shock absorbers used are adjustable to control the ‘hardness’ of the impact forces
generated. A rotating collar on the shock absorber is used to make this adjustment. Adjustable
shock absorbers are adjusted after the desired speed of the mechanism has been set. Refer to
Section 8.5.1:
‘Mechanism Speeds’
.
To set a shock absorber,
1) Start from a ‘soft’ setting.
2) Gradually increase the hardness until the component comes to a smoothly controlled
stop at the end of its travel. If the mechanism bounces when it hits the shock absorber
and then takes considerable time to complete its travel, the setting is too hard.
Shock absorber settings are most critical on fast-running machines. The elastomeric shock
bumpers used do not require adjustment.
8.5.3 Conveyor Belt Tension & Tracking
The correct belt tension is factory-set on new
machines, but the tension will decrease when
the machine is in service, particularly in the
first few months, and will require regular
adjustment to maintain correct case transfer.
Two adjusting screws are located under each
idle pulley. They are threaded rods with nuts.
There is also a locking bolt that secures the
idle pulley square shaft to the mounting
channel. To remove the belt, loosen the
locking bolt, and back the nuts off to release
all tension.
Figure 8-2: Conveyor
Belt Tensioning