Patent ID: 7241962

Claim:
Apparatus for electrical discharge texturing of a cylindrical surface of a work roll, comprising: a slideway that extends parallel to a central axis of the roll; a rotational support for rotatably supporting and rotating the roll about the central axis of the roll and for raising or lowering the central axis of the roll relative to the slideway; a carriage supported for movement along the slideway; an oil tank-electrode assembly mounted on the carriage, comprising an oil tank sealingly engaged with a sufficient portion of the cylindrical surface of the roll to prevent oil leakage and filled with a dielectric oil to a level below, at or above a first horizontal plane which passes through the central axis, the roll being at least partially immersed in the dielectric oil, and one or more than one electrode affixed to the oil tank, each electrode having a center line and having a proximal end disposed below the level of the dielectric oil and in close proximity to the cylindrical surface and a distal end extending outside the tank, the center line being disposed in a second horizontal plane which is the same as or below the first horizontal plane or the center line at the proximal end being disposed in the first or second horizontal plane when the center line at the distal end is disposed below said first or second horizontal plane.