Patent ID: 8465595

Claim:
A method of cleaning a workpiece comprising the following steps: a. placing a workpiece ( 5 ) of a flat disc shape in between at least one pair of roller brushes ( 15 ), said roller brushes ( 15 ) rotating in an opposite direction with respect to each other and said roller brushes ( 15 ) positioned close enough to each other so as to scrub the workpiece ( 5 ), and the frictional force between the rotating roller brushes ( 15 ) and the workpiece ( 5 ) pushing the workpiece ( 5 ) in the direction of rotation; b. holding the workpiece ( 5 ) in this position for a predetermined amount of time by using a pair of edgewheels ( 30 , 31 ); and c. releasing the workpiece ( 5 ) held by the pair of edgewheels ( 30 , 31 ), so that the workpiece is propelled by the rotation of the said roller brushes ( 15 ); d. wherein, the axis of rotation of said roller brushes ( 15 ) is in a substantially vertical direction.