Patent ID: 7789600

Claim:
A tip dresser for dressing an electrode tip comprising: a rotatable holder configured to be rotated around a rotation axis thereof and having two concave tapers formed respectively on upper and lower faces of the holder, the concave tapers being coaxial with the rotation axis of the holder; and a cutter fixed to the holder and rotatable therewith, the cutter including a cutting portion having a linear cutting edge that is slanted with respect to the rotation axis and also having a transverse cutting edge, which cutting portion projects into a space within the concave tapers and will engage the electrode tip when the electrode tip is inserted into one of the concave tapers such that the transverse cutting edge engages a terminal end face of the electrode tip and the linear cutting edge engages a peripheral side surface of the electrode tip that is closer to the rotation axis than is an electrode tip outer diameter surface that is adjacent to the peripheral side surface; and wherein the cutter is positioned on the holder based on a size of the electrode tip to be dressed such that when the electrode tip is inserted into one of the concave tapers coaxially with the rotation axis of the holder, the cutting portion of the cutter will protrude closer to the rotation axis than does the surface of the one concave taper only where the cutting portion is disposed at a distance less than a radius of the electrode tip from the rotation axis such that the linear cutting edge intersects the one concave taper, and radial swinging movement of the electrode tip relative to the rotation axis of the holder will be suppressed by engagement of the electrode tip with the surface of the one concave taper.