With help of the automatic tool feed on wide belt sanders of the manufacturer Bütfering the application of the contact roller can be selected in the sanding program. During the start of the sanding program and after reaching the desired federate, a pneumatic cylinder brings down the contact roller in sanding position. On switching off the contact roller unit, the roller will be raised automatically from the sanding position.

Immediately on the cylinder of the automatic tool feed the ring for the set-up of the sanding belt-grain compensation is located.

The AZ automatic tool feed is both present on combined drum sander- sanding shoe-units as a clear sanding roller unit.