Dressing apparatus for cup-type abrasive wheels as used for grinding spiral bevel gearwheels

A dressing apparatus for dressing of a cup-type, abrasive, spiral bevel gear-grinding wheel having a concave conical grinding flank, a convex conical grinding flank and an axis of turning, comprising:

• (A) means for holding said cup-type grinding wheel parallel to its axis of turning;
• (B) a diamond abrasive dressing roller having an axis of symmetry and two conical dressing surfaces, one of which has a larger cone angle than the other;
• (C) a dressing tool head for supporting said dressing roller arrangement;
• (D) means for producing a first plunge cutting motion of said tool head, from a first position thereof, toward a said cup-type grinding wheel held by said means for holding, in a manner causing the conical dressing surface of said dressing roller having the larger cone angle to dress said convex conical grinding flank of the grinding wheel and for producing a second plunge cutting motion of said tool head, from a second position thereof, toward said cup-type grinding wheel, in a manner causing the conical dressing surface of the dressing roller having the lesser cone angle to dress said concave conical grinding flank of the grinding wheel;
• and
• (E) means for shifting said dressing tool head from said first position thereof to said second position thereof in a manner rocking said dressing roller about an axis at an angle relative to the axis of turning of said grinding wheel and the axis of symmetry of the dressing roller.