16
Sanding Belt Oscillation
Belt oscillation is done with a photo electric
tracking eye and a air solenoid valve. When
the sanding belt is operating the edge of the
belt will pass across the light beam , which will
them activate a solenoid valve that will allow
air to pass to the tracking cylinder and pivot the
upper idler roll. This will cause the belt to travel
in the opposite direction on the Idler roll.
This process will continually repeat itself.
If the idler roll does not pivot, check the photo eye
for dust or other blockage. If that does not resolve
the problem, check to see that the solenoid has power
to allow air to pass to the tracking cylinder itself.
Release the sanding belt tension and slide the belt
so you know the light from the photo eye can reach
past the edge of the belt. Make sure that no dust is
blocking the photo eye. If photo eye light can pass
across, put something in the light path and see if
the idler roll will move. If it still does not, remove
air line from tracking cylinder and see if air is passing
through the line to the cylinder. (When you block the light
path air should change from this line.) Last check the
solenoid, if you manually move the piston in the
solenoid the air should shift in the air line to the
tracking cylinder.
If at this point you can not determine problem contact
your local dealer or call Apex Machine Group for
service.
Frequently inspect photo eye and make sure it is
clean and clear of obstructions.
Oscillation Speed
To adjust the speed of the oscillation, there are two
speed valves (Figure 9), on the tracking cylinder.
Loosen jam nut and adjust the air flow to control belt
speed and travel. Top valve controls the speed of the
belt oscillation on the idler roll, and the larger valve
controls how far the belt travels on the idler roll.
When finished make sure jam nuts are tight.
Tracking adjustment lever
Figure 9
Jam Nut
Speed Valve
Photo electrical
tracking eye
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